4958 lines
163 KiB
C
4958 lines
163 KiB
C
/*
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* linux/drivers/ide/ide-tape.c Version 1.19 Nov, 2003
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*
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* Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il>
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*
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* $Header$
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*
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* This driver was constructed as a student project in the software laboratory
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* of the faculty of electrical engineering in the Technion - Israel's
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* Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
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*
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* It is hereby placed under the terms of the GNU general public license.
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* (See linux/COPYING).
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*/
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/*
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* IDE ATAPI streaming tape driver.
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*
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* This driver is a part of the Linux ide driver and works in co-operation
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* with linux/drivers/block/ide.c.
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*
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* The driver, in co-operation with ide.c, basically traverses the
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* request-list for the block device interface. The character device
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* interface, on the other hand, creates new requests, adds them
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* to the request-list of the block device, and waits for their completion.
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*
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* Pipelined operation mode is now supported on both reads and writes.
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*
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* The block device major and minor numbers are determined from the
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* tape's relative position in the ide interfaces, as explained in ide.c.
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*
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* The character device interface consists of the following devices:
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*
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* ht0 major 37, minor 0 first IDE tape, rewind on close.
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* ht1 major 37, minor 1 second IDE tape, rewind on close.
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* ...
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* nht0 major 37, minor 128 first IDE tape, no rewind on close.
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* nht1 major 37, minor 129 second IDE tape, no rewind on close.
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* ...
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*
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* Run linux/scripts/MAKEDEV.ide to create the above entries.
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*
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* The general magnetic tape commands compatible interface, as defined by
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* include/linux/mtio.h, is accessible through the character device.
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*
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* General ide driver configuration options, such as the interrupt-unmask
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* flag, can be configured by issuing an ioctl to the block device interface,
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* as any other ide device.
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*
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* Our own ide-tape ioctl's can be issued to either the block device or
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* the character device interface.
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*
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* Maximal throughput with minimal bus load will usually be achieved in the
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* following scenario:
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*
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* 1. ide-tape is operating in the pipelined operation mode.
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* 2. No buffering is performed by the user backup program.
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*
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* Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive.
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*
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* Ver 0.1 Nov 1 95 Pre-working code :-)
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* Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure
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* was successful ! (Using tar cvf ... on the block
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* device interface).
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* A longer backup resulted in major swapping, bad
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* overall Linux performance and eventually failed as
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* we received non serial read-ahead requests from the
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* buffer cache.
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* Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the
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* character device interface. Linux's responsiveness
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* and performance doesn't seem to be much affected
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* from the background backup procedure.
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* Some general mtio.h magnetic tape operations are
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* now supported by our character device. As a result,
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* popular tape utilities are starting to work with
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* ide tapes :-)
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* The following configurations were tested:
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* 1. An IDE ATAPI TAPE shares the same interface
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* and irq with an IDE ATAPI CDROM.
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* 2. An IDE ATAPI TAPE shares the same interface
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* and irq with a normal IDE disk.
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* Both configurations seemed to work just fine !
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* However, to be on the safe side, it is meanwhile
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* recommended to give the IDE TAPE its own interface
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* and irq.
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* The one thing which needs to be done here is to
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* add a "request postpone" feature to ide.c,
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* so that we won't have to wait for the tape to finish
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* performing a long media access (DSC) request (such
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* as a rewind) before we can access the other device
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* on the same interface. This effect doesn't disturb
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* normal operation most of the time because read/write
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* requests are relatively fast, and once we are
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* performing one tape r/w request, a lot of requests
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* from the other device can be queued and ide.c will
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* service all of them after this single tape request.
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* Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree.
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* On each read / write request, we now ask the drive
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* if we can transfer a constant number of bytes
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* (a parameter of the drive) only to its buffers,
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* without causing actual media access. If we can't,
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* we just wait until we can by polling the DSC bit.
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* This ensures that while we are not transferring
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* more bytes than the constant referred to above, the
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* interrupt latency will not become too high and
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* we won't cause an interrupt timeout, as happened
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* occasionally in the previous version.
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* While polling for DSC, the current request is
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* postponed and ide.c is free to handle requests from
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* the other device. This is handled transparently to
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* ide.c. The hwgroup locking method which was used
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* in the previous version was removed.
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* Use of new general features which are provided by
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* ide.c for use with atapi devices.
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* (Programming done by Mark Lord)
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* Few potential bug fixes (Again, suggested by Mark)
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* Single character device data transfers are now
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* not limited in size, as they were before.
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* We are asking the tape about its recommended
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* transfer unit and send a larger data transfer
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* as several transfers of the above size.
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* For best results, use an integral number of this
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* basic unit (which is shown during driver
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* initialization). I will soon add an ioctl to get
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* this important parameter.
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* Our data transfer buffer is allocated on startup,
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* rather than before each data transfer. This should
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* ensure that we will indeed have a data buffer.
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* Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape
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* shared an interface with another device.
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* (poll_for_dsc was a complete mess).
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* Removed some old (non-active) code which had
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* to do with supporting buffer cache originated
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* requests.
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* The block device interface can now be opened, so
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* that general ide driver features like the unmask
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* interrupts flag can be selected with an ioctl.
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* This is the only use of the block device interface.
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* New fast pipelined operation mode (currently only on
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* writes). When using the pipelined mode, the
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* throughput can potentially reach the maximum
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* tape supported throughput, regardless of the
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* user backup program. On my tape drive, it sometimes
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* boosted performance by a factor of 2. Pipelined
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* mode is enabled by default, but since it has a few
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* downfalls as well, you may want to disable it.
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* A short explanation of the pipelined operation mode
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* is available below.
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* Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition.
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* Added pipeline read mode. As a result, restores
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* are now as fast as backups.
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* Optimized shared interface behavior. The new behavior
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* typically results in better IDE bus efficiency and
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* higher tape throughput.
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* Pre-calculation of the expected read/write request
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* service time, based on the tape's parameters. In
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* the pipelined operation mode, this allows us to
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* adjust our polling frequency to a much lower value,
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* and thus to dramatically reduce our load on Linux,
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* without any decrease in performance.
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* Implemented additional mtio.h operations.
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* The recommended user block size is returned by
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* the MTIOCGET ioctl.
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* Additional minor changes.
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* Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the
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* use of some block sizes during a restore procedure.
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* The character device interface will now present a
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* continuous view of the media - any mix of block sizes
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* during a backup/restore procedure is supported. The
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* driver will buffer the requests internally and
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* convert them to the tape's recommended transfer
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* unit, making performance almost independent of the
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* chosen user block size.
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* Some improvements in error recovery.
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* By cooperating with ide-dma.c, bus mastering DMA can
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* now sometimes be used with IDE tape drives as well.
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* Bus mastering DMA has the potential to dramatically
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* reduce the CPU's overhead when accessing the device,
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* and can be enabled by using hdparm -d1 on the tape's
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* block device interface. For more info, read the
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* comments in ide-dma.c.
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* Ver 1.4 Mar 13 96 Fixed serialize support.
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* Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85.
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* Fixed pipelined read mode inefficiency.
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* Fixed nasty null dereferencing bug.
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* Ver 1.6 Aug 16 96 Fixed FPU usage in the driver.
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* Fixed end of media bug.
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* Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model.
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* Ver 1.8 Sep 26 96 Attempt to find a better balance between good
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* interactive response and high system throughput.
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* Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather
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* than requiring an explicit FSF command.
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* Abort pending requests at end of media.
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* MTTELL was sometimes returning incorrect results.
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* Return the real block size in the MTIOCGET ioctl.
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* Some error recovery bug fixes.
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* Ver 1.10 Nov 5 96 Major reorganization.
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* Reduced CPU overhead a bit by eliminating internal
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* bounce buffers.
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* Added module support.
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* Added multiple tape drives support.
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* Added partition support.
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* Rewrote DSC handling.
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* Some portability fixes.
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* Removed ide-tape.h.
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* Additional minor changes.
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* Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling.
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* Use ide_stall_queue() for DSC overlap.
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* Use the maximum speed rather than the current speed
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* to compute the request service time.
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* Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data
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* corruption, which could occur if the total number
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* of bytes written to the tape was not an integral
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* number of tape blocks.
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* Add support for INTERRUPT DRQ devices.
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* Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB
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* Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives.
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* Replace cli()/sti() with hwgroup spinlocks.
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* Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup
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* spinlock with private per-tape spinlock.
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* Ver 1.16 Sep 1 99 Add OnStream tape support.
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* Abort read pipeline on EOD.
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* Wait for the tape to become ready in case it returns
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* "in the process of becoming ready" on open().
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* Fix zero padding of the last written block in
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* case the tape block size is larger than PAGE_SIZE.
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* Decrease the default disconnection time to tn.
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* Ver 1.16e Oct 3 99 Minor fixes.
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* Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen,
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* niessen@iae.nl / arnold.niessen@philips.com
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* GO-1) Undefined code in idetape_read_position
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* according to Gadi's email
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* AJN-1) Minor fix asc == 11 should be asc == 0x11
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* in idetape_issue_packet_command (did effect
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* debugging output only)
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* AJN-2) Added more debugging output, and
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* added ide-tape: where missing. I would also
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* like to add tape->name where possible
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* AJN-3) Added different debug_level's
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* via /proc/ide/hdc/settings
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* "debug_level" determines amount of debugging output;
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* can be changed using /proc/ide/hdx/settings
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* 0 : almost no debugging output
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* 1 : 0+output errors only
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* 2 : 1+output all sensekey/asc
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* 3 : 2+follow all chrdev related procedures
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* 4 : 3+follow all procedures
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* 5 : 4+include pc_stack rq_stack info
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* 6 : 5+USE_COUNT updates
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* AJN-4) Fixed timeout for retension in idetape_queue_pc_tail
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* from 5 to 10 minutes
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* AJN-5) Changed maximum number of blocks to skip when
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* reading tapes with multiple consecutive write
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* errors from 100 to 1000 in idetape_get_logical_blk
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* Proposed changes to code:
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* 1) output "logical_blk_num" via /proc
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* 2) output "current_operation" via /proc
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* 3) Either solve or document the fact that `mt rewind' is
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* required after reading from /dev/nhtx to be
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* able to rmmod the idetape module;
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* Also, sometimes an application finishes but the
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* device remains `busy' for some time. Same cause ?
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* Proposed changes to release-notes:
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* 4) write a simple `quickstart' section in the
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* release notes; I volunteer if you don't want to
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* 5) include a pointer to video4linux in the doc
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* to stimulate video applications
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* 6) release notes lines 331 and 362: explain what happens
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* if the application data rate is higher than 1100 KB/s;
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* similar approach to lower-than-500 kB/s ?
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* 7) 6.6 Comparison; wouldn't it be better to allow different
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* strategies for read and write ?
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* Wouldn't it be better to control the tape buffer
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* contents instead of the bandwidth ?
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* 8) line 536: replace will by would (if I understand
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* this section correctly, a hypothetical and unwanted situation
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* is being described)
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* Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames.
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* Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl
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* - Add idetape_onstream_mode_sense_tape_parameter_page
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* function to get tape capacity in frames: tape->capacity.
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* - Add support for DI-50 drives( or any DI- drive).
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* - 'workaround' for read error/blank block around block 3000.
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* - Implement Early warning for end of media for Onstream.
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* - Cosmetic code changes for readability.
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* - Idetape_position_tape should not use SKIP bit during
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* Onstream read recovery.
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* - Add capacity, logical_blk_num and first/last_frame_position
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* to /proc/ide/hd?/settings.
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* - Module use count was gone in the Linux 2.4 driver.
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* Ver 1.17a Apr 2001 Willem Riede osst@riede.org
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* - Get drive's actual block size from mode sense block descriptor
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* - Limit size of pipeline
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* Ver 1.17b Oct 2002 Alan Stern <stern@rowland.harvard.edu>
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* Changed IDETAPE_MIN_PIPELINE_STAGES to 1 and actually used
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* it in the code!
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* Actually removed aborted stages in idetape_abort_pipeline
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* instead of just changing the command code.
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* Made the transfer byte count for Request Sense equal to the
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* actual length of the data transfer.
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* Changed handling of partial data transfers: they do not
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* cause DMA errors.
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* Moved initiation of DMA transfers to the correct place.
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* Removed reference to unallocated memory.
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* Made __idetape_discard_read_pipeline return the number of
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* sectors skipped, not the number of stages.
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* Replaced errant kfree() calls with __idetape_kfree_stage().
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* Fixed off-by-one error in testing the pipeline length.
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* Fixed handling of filemarks in the read pipeline.
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* Small code optimization for MTBSF and MTBSFM ioctls.
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* Don't try to unlock the door during device close if is
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* already unlocked!
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* Cosmetic fixes to miscellaneous debugging output messages.
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* Set the minimum /proc/ide/hd?/settings values for "pipeline",
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* "pipeline_min", and "pipeline_max" to 1.
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*
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* Here are some words from the first releases of hd.c, which are quoted
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* in ide.c and apply here as well:
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*
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* | Special care is recommended. Have Fun!
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*
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*/
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/*
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* An overview of the pipelined operation mode.
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*
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* In the pipelined write mode, we will usually just add requests to our
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* pipeline and return immediately, before we even start to service them. The
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* user program will then have enough time to prepare the next request while
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* we are still busy servicing previous requests. In the pipelined read mode,
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* the situation is similar - we add read-ahead requests into the pipeline,
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* before the user even requested them.
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*
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* The pipeline can be viewed as a "safety net" which will be activated when
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* the system load is high and prevents the user backup program from keeping up
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* with the current tape speed. At this point, the pipeline will get
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* shorter and shorter but the tape will still be streaming at the same speed.
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* Assuming we have enough pipeline stages, the system load will hopefully
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* decrease before the pipeline is completely empty, and the backup program
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* will be able to "catch up" and refill the pipeline again.
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*
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* When using the pipelined mode, it would be best to disable any type of
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* buffering done by the user program, as ide-tape already provides all the
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* benefits in the kernel, where it can be done in a more efficient way.
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* As we will usually not block the user program on a request, the most
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* efficient user code will then be a simple read-write-read-... cycle.
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* Any additional logic will usually just slow down the backup process.
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*
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* Using the pipelined mode, I get a constant over 400 KBps throughput,
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* which seems to be the maximum throughput supported by my tape.
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*
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* However, there are some downfalls:
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*
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* 1. We use memory (for data buffers) in proportional to the number
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* of pipeline stages (each stage is about 26 KB with my tape).
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* 2. In the pipelined write mode, we cheat and postpone error codes
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* to the user task. In read mode, the actual tape position
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* will be a bit further than the last requested block.
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*
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* Concerning (1):
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*
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* 1. We allocate stages dynamically only when we need them. When
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* we don't need them, we don't consume additional memory. In
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* case we can't allocate stages, we just manage without them
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* (at the expense of decreased throughput) so when Linux is
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* tight in memory, we will not pose additional difficulties.
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*
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* 2. The maximum number of stages (which is, in fact, the maximum
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* amount of memory) which we allocate is limited by the compile
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* time parameter IDETAPE_MAX_PIPELINE_STAGES.
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*
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* 3. The maximum number of stages is a controlled parameter - We
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* don't start from the user defined maximum number of stages
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* but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we
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* will not even allocate this amount of stages if the user
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* program can't handle the speed). We then implement a feedback
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* loop which checks if the pipeline is empty, and if it is, we
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* increase the maximum number of stages as necessary until we
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* reach the optimum value which just manages to keep the tape
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* busy with minimum allocated memory or until we reach
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* IDETAPE_MAX_PIPELINE_STAGES.
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*
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* Concerning (2):
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*
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* In pipelined write mode, ide-tape can not return accurate error codes
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* to the user program since we usually just add the request to the
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* pipeline without waiting for it to be serviced. In case an error
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* occurs, I will report it on the next user request.
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*
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* In the pipelined read mode, subsequent read requests or forward
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* filemark spacing will perform correctly, as we preserve all blocks
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* and filemarks which we encountered during our excess read-ahead.
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*
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* For accurate tape positioning and error reporting, disabling
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* pipelined mode might be the best option.
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*
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* You can enable/disable/tune the pipelined operation mode by adjusting
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* the compile time parameters below.
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*/
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/*
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* Possible improvements.
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*
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* 1. Support for the ATAPI overlap protocol.
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*
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* In order to maximize bus throughput, we currently use the DSC
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* overlap method which enables ide.c to service requests from the
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* other device while the tape is busy executing a command. The
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* DSC overlap method involves polling the tape's status register
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* for the DSC bit, and servicing the other device while the tape
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* isn't ready.
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*
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* In the current QIC development standard (December 1995),
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* it is recommended that new tape drives will *in addition*
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* implement the ATAPI overlap protocol, which is used for the
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* same purpose - efficient use of the IDE bus, but is interrupt
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* driven and thus has much less CPU overhead.
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*
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* ATAPI overlap is likely to be supported in most new ATAPI
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* devices, including new ATAPI cdroms, and thus provides us
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* a method by which we can achieve higher throughput when
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* sharing a (fast) ATA-2 disk with any (slow) new ATAPI device.
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*/
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#define IDETAPE_VERSION "1.19"
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/major.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/errno.h>
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#include <linux/genhd.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/ide.h>
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#include <linux/smp_lock.h>
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#include <linux/completion.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/unaligned.h>
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/*
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* partition
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*/
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typedef struct os_partition_s {
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__u8 partition_num;
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__u8 par_desc_ver;
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__u16 wrt_pass_cntr;
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__u32 first_frame_addr;
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__u32 last_frame_addr;
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__u32 eod_frame_addr;
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} os_partition_t;
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/*
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* DAT entry
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*/
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typedef struct os_dat_entry_s {
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__u32 blk_sz;
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__u16 blk_cnt;
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__u8 flags;
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__u8 reserved;
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} os_dat_entry_t;
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/*
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* DAT
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*/
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#define OS_DAT_FLAGS_DATA (0xc)
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#define OS_DAT_FLAGS_MARK (0x1)
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typedef struct os_dat_s {
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__u8 dat_sz;
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__u8 reserved1;
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__u8 entry_cnt;
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__u8 reserved3;
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os_dat_entry_t dat_list[16];
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} os_dat_t;
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#include <linux/mtio.h>
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/**************************** Tunable parameters *****************************/
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/*
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* Pipelined mode parameters.
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*
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* We try to use the minimum number of stages which is enough to
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* keep the tape constantly streaming. To accomplish that, we implement
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* a feedback loop around the maximum number of stages:
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*
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* We start from MIN maximum stages (we will not even use MIN stages
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* if we don't need them), increment it by RATE*(MAX-MIN)
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* whenever we sense that the pipeline is empty, until we reach
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* the optimum value or until we reach MAX.
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*
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* Setting the following parameter to 0 is illegal: the pipelined mode
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* cannot be disabled (calculate_speeds() divides by tape->max_stages.)
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*/
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#define IDETAPE_MIN_PIPELINE_STAGES 1
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#define IDETAPE_MAX_PIPELINE_STAGES 400
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#define IDETAPE_INCREASE_STAGES_RATE 20
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/*
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* The following are used to debug the driver:
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*
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* Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities.
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* Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
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* Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in
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* some places.
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*
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* Setting them to 0 will restore normal operation mode:
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*
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* 1. Disable logging normal successful operations.
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* 2. Disable self-sanity checks.
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* 3. Errors will still be logged, of course.
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*
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* All the #if DEBUG code will be removed some day, when the driver
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* is verified to be stable enough. This will make it much more
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* esthetic.
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*/
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#define IDETAPE_DEBUG_INFO 0
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#define IDETAPE_DEBUG_LOG 0
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#define IDETAPE_DEBUG_BUGS 1
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/*
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* After each failed packet command we issue a request sense command
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* and retry the packet command IDETAPE_MAX_PC_RETRIES times.
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*
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* Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
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*/
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#define IDETAPE_MAX_PC_RETRIES 3
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/*
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* With each packet command, we allocate a buffer of
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* IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
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* commands (Not for READ/WRITE commands).
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*/
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#define IDETAPE_PC_BUFFER_SIZE 256
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/*
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* In various places in the driver, we need to allocate storage
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* for packet commands and requests, which will remain valid while
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* we leave the driver to wait for an interrupt or a timeout event.
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*/
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#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
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/*
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* Some drives (for example, Seagate STT3401A Travan) require a very long
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* timeout, because they don't return an interrupt or clear their busy bit
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* until after the command completes (even retension commands).
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*/
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#define IDETAPE_WAIT_CMD (900*HZ)
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/*
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* The following parameter is used to select the point in the internal
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* tape fifo in which we will start to refill the buffer. Decreasing
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* the following parameter will improve the system's latency and
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* interactive response, while using a high value might improve sytem
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* throughput.
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*/
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#define IDETAPE_FIFO_THRESHOLD 2
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/*
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* DSC polling parameters.
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*
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* Polling for DSC (a single bit in the status register) is a very
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* important function in ide-tape. There are two cases in which we
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* poll for DSC:
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*
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* 1. Before a read/write packet command, to ensure that we
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* can transfer data from/to the tape's data buffers, without
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* causing an actual media access. In case the tape is not
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* ready yet, we take out our request from the device
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* request queue, so that ide.c will service requests from
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* the other device on the same interface meanwhile.
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*
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* 2. After the successful initialization of a "media access
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* packet command", which is a command which can take a long
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* time to complete (it can be several seconds or even an hour).
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*
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* Again, we postpone our request in the middle to free the bus
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* for the other device. The polling frequency here should be
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* lower than the read/write frequency since those media access
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* commands are slow. We start from a "fast" frequency -
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* IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
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* after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
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* lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
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*
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* We also set a timeout for the timer, in case something goes wrong.
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* The timeout should be longer then the maximum execution time of a
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* tape operation.
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*/
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/*
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* DSC timings.
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*/
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#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
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#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
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#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
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#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
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#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
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#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
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#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
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/*************************** End of tunable parameters ***********************/
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/*
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* Debugging/Performance analysis
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*
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* I/O trace support
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*/
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#define USE_IOTRACE 0
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#if USE_IOTRACE
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#include <linux/io_trace.h>
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#define IO_IDETAPE_FIFO 500
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#endif
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/*
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* Read/Write error simulation
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*/
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#define SIMULATE_ERRORS 0
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/*
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* For general magnetic tape device compatibility.
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*/
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typedef enum {
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idetape_direction_none,
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idetape_direction_read,
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idetape_direction_write
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} idetape_chrdev_direction_t;
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struct idetape_bh {
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unsigned short b_size;
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atomic_t b_count;
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struct idetape_bh *b_reqnext;
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char *b_data;
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};
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/*
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* Our view of a packet command.
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*/
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typedef struct idetape_packet_command_s {
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u8 c[12]; /* Actual packet bytes */
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int retries; /* On each retry, we increment retries */
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int error; /* Error code */
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int request_transfer; /* Bytes to transfer */
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int actually_transferred; /* Bytes actually transferred */
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int buffer_size; /* Size of our data buffer */
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struct idetape_bh *bh;
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char *b_data;
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int b_count;
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u8 *buffer; /* Data buffer */
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u8 *current_position; /* Pointer into the above buffer */
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ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
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u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
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unsigned long flags; /* Status/Action bit flags: long for set_bit */
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} idetape_pc_t;
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/*
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* Packet command flag bits.
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*/
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/* Set when an error is considered normal - We won't retry */
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#define PC_ABORT 0
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/* 1 When polling for DSC on a media access command */
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#define PC_WAIT_FOR_DSC 1
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/* 1 when we prefer to use DMA if possible */
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#define PC_DMA_RECOMMENDED 2
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/* 1 while DMA in progress */
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#define PC_DMA_IN_PROGRESS 3
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/* 1 when encountered problem during DMA */
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#define PC_DMA_ERROR 4
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/* Data direction */
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#define PC_WRITING 5
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/*
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* Capabilities and Mechanical Status Page
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*/
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typedef struct {
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unsigned page_code :6; /* Page code - Should be 0x2a */
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__u8 reserved0_6 :1;
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__u8 ps :1; /* parameters saveable */
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__u8 page_length; /* Page Length - Should be 0x12 */
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__u8 reserved2, reserved3;
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unsigned ro :1; /* Read Only Mode */
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unsigned reserved4_1234 :4;
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unsigned sprev :1; /* Supports SPACE in the reverse direction */
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unsigned reserved4_67 :2;
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unsigned reserved5_012 :3;
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unsigned efmt :1; /* Supports ERASE command initiated formatting */
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unsigned reserved5_4 :1;
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unsigned qfa :1; /* Supports the QFA two partition formats */
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unsigned reserved5_67 :2;
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unsigned lock :1; /* Supports locking the volume */
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unsigned locked :1; /* The volume is locked */
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unsigned prevent :1; /* The device defaults in the prevent state after power up */
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unsigned eject :1; /* The device can eject the volume */
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__u8 disconnect :1; /* The device can break request > ctl */
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__u8 reserved6_5 :1;
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unsigned ecc :1; /* Supports error correction */
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unsigned cmprs :1; /* Supports data compression */
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unsigned reserved7_0 :1;
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unsigned blk512 :1; /* Supports 512 bytes block size */
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unsigned blk1024 :1; /* Supports 1024 bytes block size */
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unsigned reserved7_3_6 :4;
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unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
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/* transfers for slow buffer memory ??? */
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/* Also 32768 block size in some cases */
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__u16 max_speed; /* Maximum speed supported in KBps */
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__u8 reserved10, reserved11;
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__u16 ctl; /* Continuous Transfer Limit in blocks */
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__u16 speed; /* Current Speed, in KBps */
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__u16 buffer_size; /* Buffer Size, in 512 bytes */
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__u8 reserved18, reserved19;
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} idetape_capabilities_page_t;
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/*
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* Block Size Page
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*/
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typedef struct {
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unsigned page_code :6; /* Page code - Should be 0x30 */
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unsigned reserved1_6 :1;
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unsigned ps :1;
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__u8 page_length; /* Page Length - Should be 2 */
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__u8 reserved2;
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unsigned play32 :1;
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unsigned play32_5 :1;
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unsigned reserved2_23 :2;
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unsigned record32 :1;
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unsigned record32_5 :1;
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unsigned reserved2_6 :1;
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unsigned one :1;
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} idetape_block_size_page_t;
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/*
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* A pipeline stage.
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*/
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typedef struct idetape_stage_s {
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struct request rq; /* The corresponding request */
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struct idetape_bh *bh; /* The data buffers */
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struct idetape_stage_s *next; /* Pointer to the next stage */
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} idetape_stage_t;
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/*
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* REQUEST SENSE packet command result - Data Format.
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*/
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typedef struct {
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unsigned error_code :7; /* Current of deferred errors */
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unsigned valid :1; /* The information field conforms to QIC-157C */
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__u8 reserved1 :8; /* Segment Number - Reserved */
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unsigned sense_key :4; /* Sense Key */
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unsigned reserved2_4 :1; /* Reserved */
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unsigned ili :1; /* Incorrect Length Indicator */
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unsigned eom :1; /* End Of Medium */
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unsigned filemark :1; /* Filemark */
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__u32 information __attribute__ ((packed));
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__u8 asl; /* Additional sense length (n-7) */
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__u32 command_specific; /* Additional command specific information */
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__u8 asc; /* Additional Sense Code */
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__u8 ascq; /* Additional Sense Code Qualifier */
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__u8 replaceable_unit_code; /* Field Replaceable Unit Code */
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unsigned sk_specific1 :7; /* Sense Key Specific */
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unsigned sksv :1; /* Sense Key Specific information is valid */
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__u8 sk_specific2; /* Sense Key Specific */
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__u8 sk_specific3; /* Sense Key Specific */
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__u8 pad[2]; /* Padding to 20 bytes */
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} idetape_request_sense_result_t;
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/*
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* Most of our global data which we need to save even as we leave the
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* driver due to an interrupt or a timer event is stored in a variable
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* of type idetape_tape_t, defined below.
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*/
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typedef struct ide_tape_obj {
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ide_drive_t *drive;
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ide_driver_t *driver;
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struct gendisk *disk;
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struct kref kref;
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/*
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* Since a typical character device operation requires more
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* than one packet command, we provide here enough memory
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* for the maximum of interconnected packet commands.
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* The packet commands are stored in the circular array pc_stack.
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* pc_stack_index points to the last used entry, and warps around
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* to the start when we get to the last array entry.
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*
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* pc points to the current processed packet command.
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*
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* failed_pc points to the last failed packet command, or contains
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* NULL if we do not need to retry any packet command. This is
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* required since an additional packet command is needed before the
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* retry, to get detailed information on what went wrong.
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*/
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/* Current packet command */
|
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idetape_pc_t *pc;
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/* Last failed packet command */
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idetape_pc_t *failed_pc;
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/* Packet command stack */
|
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idetape_pc_t pc_stack[IDETAPE_PC_STACK];
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/* Next free packet command storage space */
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int pc_stack_index;
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struct request rq_stack[IDETAPE_PC_STACK];
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/* We implement a circular array */
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int rq_stack_index;
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|
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/*
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* DSC polling variables.
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*
|
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* While polling for DSC we use postponed_rq to postpone the
|
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* current request so that ide.c will be able to service
|
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* pending requests on the other device. Note that at most
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* we will have only one DSC (usually data transfer) request
|
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* in the device request queue. Additional requests can be
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* queued in our internal pipeline, but they will be visible
|
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* to ide.c only one at a time.
|
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*/
|
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struct request *postponed_rq;
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/* The time in which we started polling for DSC */
|
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unsigned long dsc_polling_start;
|
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/* Timer used to poll for dsc */
|
|
struct timer_list dsc_timer;
|
|
/* Read/Write dsc polling frequency */
|
|
unsigned long best_dsc_rw_frequency;
|
|
/* The current polling frequency */
|
|
unsigned long dsc_polling_frequency;
|
|
/* Maximum waiting time */
|
|
unsigned long dsc_timeout;
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|
|
/*
|
|
* Read position information
|
|
*/
|
|
u8 partition;
|
|
/* Current block */
|
|
unsigned int first_frame_position;
|
|
unsigned int last_frame_position;
|
|
unsigned int blocks_in_buffer;
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|
|
/*
|
|
* Last error information
|
|
*/
|
|
u8 sense_key, asc, ascq;
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|
|
/*
|
|
* Character device operation
|
|
*/
|
|
unsigned int minor;
|
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/* device name */
|
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char name[4];
|
|
/* Current character device data transfer direction */
|
|
idetape_chrdev_direction_t chrdev_direction;
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|
|
/*
|
|
* Device information
|
|
*/
|
|
/* Usually 512 or 1024 bytes */
|
|
unsigned short tape_block_size;
|
|
int user_bs_factor;
|
|
/* Copy of the tape's Capabilities and Mechanical Page */
|
|
idetape_capabilities_page_t capabilities;
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|
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/*
|
|
* Active data transfer request parameters.
|
|
*
|
|
* At most, there is only one ide-tape originated data transfer
|
|
* request in the device request queue. This allows ide.c to
|
|
* easily service requests from the other device when we
|
|
* postpone our active request. In the pipelined operation
|
|
* mode, we use our internal pipeline structure to hold
|
|
* more data requests.
|
|
*
|
|
* The data buffer size is chosen based on the tape's
|
|
* recommendation.
|
|
*/
|
|
/* Pointer to the request which is waiting in the device request queue */
|
|
struct request *active_data_request;
|
|
/* Data buffer size (chosen based on the tape's recommendation */
|
|
int stage_size;
|
|
idetape_stage_t *merge_stage;
|
|
int merge_stage_size;
|
|
struct idetape_bh *bh;
|
|
char *b_data;
|
|
int b_count;
|
|
|
|
/*
|
|
* Pipeline parameters.
|
|
*
|
|
* To accomplish non-pipelined mode, we simply set the following
|
|
* variables to zero (or NULL, where appropriate).
|
|
*/
|
|
/* Number of currently used stages */
|
|
int nr_stages;
|
|
/* Number of pending stages */
|
|
int nr_pending_stages;
|
|
/* We will not allocate more than this number of stages */
|
|
int max_stages, min_pipeline, max_pipeline;
|
|
/* The first stage which will be removed from the pipeline */
|
|
idetape_stage_t *first_stage;
|
|
/* The currently active stage */
|
|
idetape_stage_t *active_stage;
|
|
/* Will be serviced after the currently active request */
|
|
idetape_stage_t *next_stage;
|
|
/* New requests will be added to the pipeline here */
|
|
idetape_stage_t *last_stage;
|
|
/* Optional free stage which we can use */
|
|
idetape_stage_t *cache_stage;
|
|
int pages_per_stage;
|
|
/* Wasted space in each stage */
|
|
int excess_bh_size;
|
|
|
|
/* Status/Action flags: long for set_bit */
|
|
unsigned long flags;
|
|
/* protects the ide-tape queue */
|
|
spinlock_t spinlock;
|
|
|
|
/*
|
|
* Measures average tape speed
|
|
*/
|
|
unsigned long avg_time;
|
|
int avg_size;
|
|
int avg_speed;
|
|
|
|
/* last sense information */
|
|
idetape_request_sense_result_t sense;
|
|
|
|
char vendor_id[10];
|
|
char product_id[18];
|
|
char firmware_revision[6];
|
|
int firmware_revision_num;
|
|
|
|
/* the door is currently locked */
|
|
int door_locked;
|
|
/* the tape hardware is write protected */
|
|
char drv_write_prot;
|
|
/* the tape is write protected (hardware or opened as read-only) */
|
|
char write_prot;
|
|
|
|
/*
|
|
* Limit the number of times a request can
|
|
* be postponed, to avoid an infinite postpone
|
|
* deadlock.
|
|
*/
|
|
/* request postpone count limit */
|
|
int postpone_cnt;
|
|
|
|
/*
|
|
* Measures number of frames:
|
|
*
|
|
* 1. written/read to/from the driver pipeline (pipeline_head).
|
|
* 2. written/read to/from the tape buffers (idetape_bh).
|
|
* 3. written/read by the tape to/from the media (tape_head).
|
|
*/
|
|
int pipeline_head;
|
|
int buffer_head;
|
|
int tape_head;
|
|
int last_tape_head;
|
|
|
|
/*
|
|
* Speed control at the tape buffers input/output
|
|
*/
|
|
unsigned long insert_time;
|
|
int insert_size;
|
|
int insert_speed;
|
|
int max_insert_speed;
|
|
int measure_insert_time;
|
|
|
|
/*
|
|
* Measure tape still time, in milliseconds
|
|
*/
|
|
unsigned long tape_still_time_begin;
|
|
int tape_still_time;
|
|
|
|
/*
|
|
* Speed regulation negative feedback loop
|
|
*/
|
|
int speed_control;
|
|
int pipeline_head_speed;
|
|
int controlled_pipeline_head_speed;
|
|
int uncontrolled_pipeline_head_speed;
|
|
int controlled_last_pipeline_head;
|
|
int uncontrolled_last_pipeline_head;
|
|
unsigned long uncontrolled_pipeline_head_time;
|
|
unsigned long controlled_pipeline_head_time;
|
|
int controlled_previous_pipeline_head;
|
|
int uncontrolled_previous_pipeline_head;
|
|
unsigned long controlled_previous_head_time;
|
|
unsigned long uncontrolled_previous_head_time;
|
|
int restart_speed_control_req;
|
|
|
|
/*
|
|
* Debug_level determines amount of debugging output;
|
|
* can be changed using /proc/ide/hdx/settings
|
|
* 0 : almost no debugging output
|
|
* 1 : 0+output errors only
|
|
* 2 : 1+output all sensekey/asc
|
|
* 3 : 2+follow all chrdev related procedures
|
|
* 4 : 3+follow all procedures
|
|
* 5 : 4+include pc_stack rq_stack info
|
|
* 6 : 5+USE_COUNT updates
|
|
*/
|
|
int debug_level;
|
|
} idetape_tape_t;
|
|
|
|
static DECLARE_MUTEX(idetape_ref_sem);
|
|
|
|
static struct class *idetape_sysfs_class;
|
|
|
|
#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
|
|
|
|
#define ide_tape_g(disk) \
|
|
container_of((disk)->private_data, struct ide_tape_obj, driver)
|
|
|
|
static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
|
|
{
|
|
struct ide_tape_obj *tape = NULL;
|
|
|
|
down(&idetape_ref_sem);
|
|
tape = ide_tape_g(disk);
|
|
if (tape)
|
|
kref_get(&tape->kref);
|
|
up(&idetape_ref_sem);
|
|
return tape;
|
|
}
|
|
|
|
static void ide_tape_release(struct kref *);
|
|
|
|
static void ide_tape_put(struct ide_tape_obj *tape)
|
|
{
|
|
down(&idetape_ref_sem);
|
|
kref_put(&tape->kref, ide_tape_release);
|
|
up(&idetape_ref_sem);
|
|
}
|
|
|
|
/*
|
|
* Tape door status
|
|
*/
|
|
#define DOOR_UNLOCKED 0
|
|
#define DOOR_LOCKED 1
|
|
#define DOOR_EXPLICITLY_LOCKED 2
|
|
|
|
/*
|
|
* Tape flag bits values.
|
|
*/
|
|
#define IDETAPE_IGNORE_DSC 0
|
|
#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
|
|
#define IDETAPE_BUSY 2 /* Device already opened */
|
|
#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
|
|
#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
|
|
#define IDETAPE_FILEMARK 5 /* Currently on a filemark */
|
|
#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
|
|
#define IDETAPE_READ_ERROR 7
|
|
#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
|
|
/* 0 = no tape is loaded, so we don't rewind after ejecting */
|
|
#define IDETAPE_MEDIUM_PRESENT 9
|
|
|
|
/*
|
|
* Supported ATAPI tape drives packet commands
|
|
*/
|
|
#define IDETAPE_TEST_UNIT_READY_CMD 0x00
|
|
#define IDETAPE_REWIND_CMD 0x01
|
|
#define IDETAPE_REQUEST_SENSE_CMD 0x03
|
|
#define IDETAPE_READ_CMD 0x08
|
|
#define IDETAPE_WRITE_CMD 0x0a
|
|
#define IDETAPE_WRITE_FILEMARK_CMD 0x10
|
|
#define IDETAPE_SPACE_CMD 0x11
|
|
#define IDETAPE_INQUIRY_CMD 0x12
|
|
#define IDETAPE_ERASE_CMD 0x19
|
|
#define IDETAPE_MODE_SENSE_CMD 0x1a
|
|
#define IDETAPE_MODE_SELECT_CMD 0x15
|
|
#define IDETAPE_LOAD_UNLOAD_CMD 0x1b
|
|
#define IDETAPE_PREVENT_CMD 0x1e
|
|
#define IDETAPE_LOCATE_CMD 0x2b
|
|
#define IDETAPE_READ_POSITION_CMD 0x34
|
|
#define IDETAPE_READ_BUFFER_CMD 0x3c
|
|
#define IDETAPE_SET_SPEED_CMD 0xbb
|
|
|
|
/*
|
|
* Some defines for the READ BUFFER command
|
|
*/
|
|
#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
|
|
|
|
/*
|
|
* Some defines for the SPACE command
|
|
*/
|
|
#define IDETAPE_SPACE_OVER_FILEMARK 1
|
|
#define IDETAPE_SPACE_TO_EOD 3
|
|
|
|
/*
|
|
* Some defines for the LOAD UNLOAD command
|
|
*/
|
|
#define IDETAPE_LU_LOAD_MASK 1
|
|
#define IDETAPE_LU_RETENSION_MASK 2
|
|
#define IDETAPE_LU_EOT_MASK 4
|
|
|
|
/*
|
|
* Special requests for our block device strategy routine.
|
|
*
|
|
* In order to service a character device command, we add special
|
|
* requests to the tail of our block device request queue and wait
|
|
* for their completion.
|
|
*/
|
|
|
|
enum {
|
|
REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
|
|
REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
|
|
REQ_IDETAPE_READ = (1 << 2),
|
|
REQ_IDETAPE_WRITE = (1 << 3),
|
|
REQ_IDETAPE_READ_BUFFER = (1 << 4),
|
|
};
|
|
|
|
/*
|
|
* Error codes which are returned in rq->errors to the higher part
|
|
* of the driver.
|
|
*/
|
|
#define IDETAPE_ERROR_GENERAL 101
|
|
#define IDETAPE_ERROR_FILEMARK 102
|
|
#define IDETAPE_ERROR_EOD 103
|
|
|
|
/*
|
|
* The following is used to format the general configuration word of
|
|
* the ATAPI IDENTIFY DEVICE command.
|
|
*/
|
|
struct idetape_id_gcw {
|
|
unsigned packet_size :2; /* Packet Size */
|
|
unsigned reserved234 :3; /* Reserved */
|
|
unsigned drq_type :2; /* Command packet DRQ type */
|
|
unsigned removable :1; /* Removable media */
|
|
unsigned device_type :5; /* Device type */
|
|
unsigned reserved13 :1; /* Reserved */
|
|
unsigned protocol :2; /* Protocol type */
|
|
};
|
|
|
|
/*
|
|
* INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
|
|
*/
|
|
typedef struct {
|
|
unsigned device_type :5; /* Peripheral Device Type */
|
|
unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
|
|
unsigned reserved1_6t0 :7; /* Reserved */
|
|
unsigned rmb :1; /* Removable Medium Bit */
|
|
unsigned ansi_version :3; /* ANSI Version */
|
|
unsigned ecma_version :3; /* ECMA Version */
|
|
unsigned iso_version :2; /* ISO Version */
|
|
unsigned response_format :4; /* Response Data Format */
|
|
unsigned reserved3_45 :2; /* Reserved */
|
|
unsigned reserved3_6 :1; /* TrmIOP - Reserved */
|
|
unsigned reserved3_7 :1; /* AENC - Reserved */
|
|
__u8 additional_length; /* Additional Length (total_length-4) */
|
|
__u8 rsv5, rsv6, rsv7; /* Reserved */
|
|
__u8 vendor_id[8]; /* Vendor Identification */
|
|
__u8 product_id[16]; /* Product Identification */
|
|
__u8 revision_level[4]; /* Revision Level */
|
|
__u8 vendor_specific[20]; /* Vendor Specific - Optional */
|
|
__u8 reserved56t95[40]; /* Reserved - Optional */
|
|
/* Additional information may be returned */
|
|
} idetape_inquiry_result_t;
|
|
|
|
/*
|
|
* READ POSITION packet command - Data Format (From Table 6-57)
|
|
*/
|
|
typedef struct {
|
|
unsigned reserved0_10 :2; /* Reserved */
|
|
unsigned bpu :1; /* Block Position Unknown */
|
|
unsigned reserved0_543 :3; /* Reserved */
|
|
unsigned eop :1; /* End Of Partition */
|
|
unsigned bop :1; /* Beginning Of Partition */
|
|
u8 partition; /* Partition Number */
|
|
u8 reserved2, reserved3; /* Reserved */
|
|
u32 first_block; /* First Block Location */
|
|
u32 last_block; /* Last Block Location (Optional) */
|
|
u8 reserved12; /* Reserved */
|
|
u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
|
|
u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
|
|
} idetape_read_position_result_t;
|
|
|
|
/*
|
|
* Follows structures which are related to the SELECT SENSE / MODE SENSE
|
|
* packet commands. Those packet commands are still not supported
|
|
* by ide-tape.
|
|
*/
|
|
#define IDETAPE_BLOCK_DESCRIPTOR 0
|
|
#define IDETAPE_CAPABILITIES_PAGE 0x2a
|
|
#define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */
|
|
#define IDETAPE_BLOCK_SIZE_PAGE 0x30
|
|
#define IDETAPE_BUFFER_FILLING_PAGE 0x33
|
|
|
|
/*
|
|
* Mode Parameter Header for the MODE SENSE packet command
|
|
*/
|
|
typedef struct {
|
|
__u8 mode_data_length; /* Length of the following data transfer */
|
|
__u8 medium_type; /* Medium Type */
|
|
__u8 dsp; /* Device Specific Parameter */
|
|
__u8 bdl; /* Block Descriptor Length */
|
|
#if 0
|
|
/* data transfer page */
|
|
__u8 page_code :6;
|
|
__u8 reserved0_6 :1;
|
|
__u8 ps :1; /* parameters saveable */
|
|
__u8 page_length; /* page Length == 0x02 */
|
|
__u8 reserved2;
|
|
__u8 read32k :1; /* 32k blk size (data only) */
|
|
__u8 read32k5 :1; /* 32.5k blk size (data&AUX) */
|
|
__u8 reserved3_23 :2;
|
|
__u8 write32k :1; /* 32k blk size (data only) */
|
|
__u8 write32k5 :1; /* 32.5k blk size (data&AUX) */
|
|
__u8 reserved3_6 :1;
|
|
__u8 streaming :1; /* streaming mode enable */
|
|
#endif
|
|
} idetape_mode_parameter_header_t;
|
|
|
|
/*
|
|
* Mode Parameter Block Descriptor the MODE SENSE packet command
|
|
*
|
|
* Support for block descriptors is optional.
|
|
*/
|
|
typedef struct {
|
|
__u8 density_code; /* Medium density code */
|
|
__u8 blocks[3]; /* Number of blocks */
|
|
__u8 reserved4; /* Reserved */
|
|
__u8 length[3]; /* Block Length */
|
|
} idetape_parameter_block_descriptor_t;
|
|
|
|
/*
|
|
* The Data Compression Page, as returned by the MODE SENSE packet command.
|
|
*/
|
|
typedef struct {
|
|
unsigned page_code :6; /* Page Code - Should be 0xf */
|
|
unsigned reserved0 :1; /* Reserved */
|
|
unsigned ps :1;
|
|
__u8 page_length; /* Page Length - Should be 14 */
|
|
unsigned reserved2 :6; /* Reserved */
|
|
unsigned dcc :1; /* Data Compression Capable */
|
|
unsigned dce :1; /* Data Compression Enable */
|
|
unsigned reserved3 :5; /* Reserved */
|
|
unsigned red :2; /* Report Exception on Decompression */
|
|
unsigned dde :1; /* Data Decompression Enable */
|
|
__u32 ca; /* Compression Algorithm */
|
|
__u32 da; /* Decompression Algorithm */
|
|
__u8 reserved[4]; /* Reserved */
|
|
} idetape_data_compression_page_t;
|
|
|
|
/*
|
|
* The Medium Partition Page, as returned by the MODE SENSE packet command.
|
|
*/
|
|
typedef struct {
|
|
unsigned page_code :6; /* Page Code - Should be 0x11 */
|
|
unsigned reserved1_6 :1; /* Reserved */
|
|
unsigned ps :1;
|
|
__u8 page_length; /* Page Length - Should be 6 */
|
|
__u8 map; /* Maximum Additional Partitions - Should be 0 */
|
|
__u8 apd; /* Additional Partitions Defined - Should be 0 */
|
|
unsigned reserved4_012 :3; /* Reserved */
|
|
unsigned psum :2; /* Should be 0 */
|
|
unsigned idp :1; /* Should be 0 */
|
|
unsigned sdp :1; /* Should be 0 */
|
|
unsigned fdp :1; /* Fixed Data Partitions */
|
|
__u8 mfr; /* Medium Format Recognition */
|
|
__u8 reserved[2]; /* Reserved */
|
|
} idetape_medium_partition_page_t;
|
|
|
|
/*
|
|
* Run time configurable parameters.
|
|
*/
|
|
typedef struct {
|
|
int dsc_rw_frequency;
|
|
int dsc_media_access_frequency;
|
|
int nr_stages;
|
|
} idetape_config_t;
|
|
|
|
/*
|
|
* The variables below are used for the character device interface.
|
|
* Additional state variables are defined in our ide_drive_t structure.
|
|
*/
|
|
static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
|
|
|
|
#define ide_tape_f(file) ((file)->private_data)
|
|
|
|
static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
|
|
{
|
|
struct ide_tape_obj *tape = NULL;
|
|
|
|
down(&idetape_ref_sem);
|
|
tape = idetape_devs[i];
|
|
if (tape)
|
|
kref_get(&tape->kref);
|
|
up(&idetape_ref_sem);
|
|
return tape;
|
|
}
|
|
|
|
/*
|
|
* Function declarations
|
|
*
|
|
*/
|
|
static int idetape_chrdev_release (struct inode *inode, struct file *filp);
|
|
static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
|
|
|
|
/*
|
|
* Too bad. The drive wants to send us data which we are not ready to accept.
|
|
* Just throw it away.
|
|
*/
|
|
static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
|
|
{
|
|
while (bcount--)
|
|
(void) HWIF(drive)->INB(IDE_DATA_REG);
|
|
}
|
|
|
|
static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
|
|
{
|
|
struct idetape_bh *bh = pc->bh;
|
|
int count;
|
|
|
|
while (bcount) {
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_input_buffers\n");
|
|
idetape_discard_data(drive, bcount);
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
|
|
HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
|
|
bcount -= count;
|
|
atomic_add(count, &bh->b_count);
|
|
if (atomic_read(&bh->b_count) == bh->b_size) {
|
|
bh = bh->b_reqnext;
|
|
if (bh)
|
|
atomic_set(&bh->b_count, 0);
|
|
}
|
|
}
|
|
pc->bh = bh;
|
|
}
|
|
|
|
static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
|
|
{
|
|
struct idetape_bh *bh = pc->bh;
|
|
int count;
|
|
|
|
while (bcount) {
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_output_buffers\n");
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
count = min((unsigned int)pc->b_count, (unsigned int)bcount);
|
|
HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
|
|
bcount -= count;
|
|
pc->b_data += count;
|
|
pc->b_count -= count;
|
|
if (!pc->b_count) {
|
|
pc->bh = bh = bh->b_reqnext;
|
|
if (bh) {
|
|
pc->b_data = bh->b_data;
|
|
pc->b_count = atomic_read(&bh->b_count);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void idetape_update_buffers (idetape_pc_t *pc)
|
|
{
|
|
struct idetape_bh *bh = pc->bh;
|
|
int count;
|
|
unsigned int bcount = pc->actually_transferred;
|
|
|
|
if (test_bit(PC_WRITING, &pc->flags))
|
|
return;
|
|
while (bcount) {
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_update_buffers\n");
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
count = min((unsigned int)bh->b_size, (unsigned int)bcount);
|
|
atomic_set(&bh->b_count, count);
|
|
if (atomic_read(&bh->b_count) == bh->b_size)
|
|
bh = bh->b_reqnext;
|
|
bcount -= count;
|
|
}
|
|
pc->bh = bh;
|
|
}
|
|
|
|
/*
|
|
* idetape_next_pc_storage returns a pointer to a place in which we can
|
|
* safely store a packet command, even though we intend to leave the
|
|
* driver. A storage space for a maximum of IDETAPE_PC_STACK packet
|
|
* commands is allocated at initialization time.
|
|
*/
|
|
static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 5)
|
|
printk(KERN_INFO "ide-tape: pc_stack_index=%d\n",
|
|
tape->pc_stack_index);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
if (tape->pc_stack_index == IDETAPE_PC_STACK)
|
|
tape->pc_stack_index=0;
|
|
return (&tape->pc_stack[tape->pc_stack_index++]);
|
|
}
|
|
|
|
/*
|
|
* idetape_next_rq_storage is used along with idetape_next_pc_storage.
|
|
* Since we queue packet commands in the request queue, we need to
|
|
* allocate a request, along with the allocation of a packet command.
|
|
*/
|
|
|
|
/**************************************************************
|
|
* *
|
|
* This should get fixed to use kmalloc(.., GFP_ATOMIC) *
|
|
* followed later on by kfree(). -ml *
|
|
* *
|
|
**************************************************************/
|
|
|
|
static struct request *idetape_next_rq_storage (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 5)
|
|
printk(KERN_INFO "ide-tape: rq_stack_index=%d\n",
|
|
tape->rq_stack_index);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
if (tape->rq_stack_index == IDETAPE_PC_STACK)
|
|
tape->rq_stack_index=0;
|
|
return (&tape->rq_stack[tape->rq_stack_index++]);
|
|
}
|
|
|
|
/*
|
|
* idetape_init_pc initializes a packet command.
|
|
*/
|
|
static void idetape_init_pc (idetape_pc_t *pc)
|
|
{
|
|
memset(pc->c, 0, 12);
|
|
pc->retries = 0;
|
|
pc->flags = 0;
|
|
pc->request_transfer = 0;
|
|
pc->buffer = pc->pc_buffer;
|
|
pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
|
|
pc->bh = NULL;
|
|
pc->b_data = NULL;
|
|
}
|
|
|
|
/*
|
|
* idetape_analyze_error is called on each failed packet command retry
|
|
* to analyze the request sense. We currently do not utilize this
|
|
* information.
|
|
*/
|
|
static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = tape->failed_pc;
|
|
|
|
tape->sense = *result;
|
|
tape->sense_key = result->sense_key;
|
|
tape->asc = result->asc;
|
|
tape->ascq = result->ascq;
|
|
#if IDETAPE_DEBUG_LOG
|
|
/*
|
|
* Without debugging, we only log an error if we decided to
|
|
* give up retrying.
|
|
*/
|
|
if (tape->debug_level >= 1)
|
|
printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, "
|
|
"asc = %x, ascq = %x\n",
|
|
pc->c[0], result->sense_key,
|
|
result->asc, result->ascq);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
/*
|
|
* Correct pc->actually_transferred by asking the tape.
|
|
*/
|
|
if (test_bit(PC_DMA_ERROR, &pc->flags)) {
|
|
pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information));
|
|
idetape_update_buffers(pc);
|
|
}
|
|
|
|
/*
|
|
* If error was the result of a zero-length read or write command,
|
|
* with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
|
|
* (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
|
|
*/
|
|
if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD)
|
|
&& pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */
|
|
if (result->sense_key == 5) {
|
|
/* don't report an error, everything's ok */
|
|
pc->error = 0;
|
|
/* don't retry read/write */
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
}
|
|
if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) {
|
|
pc->error = IDETAPE_ERROR_FILEMARK;
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
if (pc->c[0] == IDETAPE_WRITE_CMD) {
|
|
if (result->eom ||
|
|
(result->sense_key == 0xd && result->asc == 0x0 &&
|
|
result->ascq == 0x2)) {
|
|
pc->error = IDETAPE_ERROR_EOD;
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
}
|
|
if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
|
|
if (result->sense_key == 8) {
|
|
pc->error = IDETAPE_ERROR_EOD;
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
if (!test_bit(PC_ABORT, &pc->flags) &&
|
|
pc->actually_transferred)
|
|
pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* idetape_active_next_stage will declare the next stage as "active".
|
|
*/
|
|
static void idetape_active_next_stage (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage = tape->next_stage;
|
|
struct request *rq = &stage->rq;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (stage == NULL) {
|
|
printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
|
|
rq->rq_disk = tape->disk;
|
|
rq->buffer = NULL;
|
|
rq->special = (void *)stage->bh;
|
|
tape->active_data_request = rq;
|
|
tape->active_stage = stage;
|
|
tape->next_stage = stage->next;
|
|
}
|
|
|
|
/*
|
|
* idetape_increase_max_pipeline_stages is a part of the feedback
|
|
* loop which tries to find the optimum number of stages. In the
|
|
* feedback loop, we are starting from a minimum maximum number of
|
|
* stages, and if we sense that the pipeline is empty, we try to
|
|
* increase it, until we reach the user compile time memory limit.
|
|
*/
|
|
static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
tape->max_stages += max(increase, 1);
|
|
tape->max_stages = max(tape->max_stages, tape->min_pipeline);
|
|
tape->max_stages = min(tape->max_stages, tape->max_pipeline);
|
|
}
|
|
|
|
/*
|
|
* idetape_kfree_stage calls kfree to completely free a stage, along with
|
|
* its related buffers.
|
|
*/
|
|
static void __idetape_kfree_stage (idetape_stage_t *stage)
|
|
{
|
|
struct idetape_bh *prev_bh, *bh = stage->bh;
|
|
int size;
|
|
|
|
while (bh != NULL) {
|
|
if (bh->b_data != NULL) {
|
|
size = (int) bh->b_size;
|
|
while (size > 0) {
|
|
free_page((unsigned long) bh->b_data);
|
|
size -= PAGE_SIZE;
|
|
bh->b_data += PAGE_SIZE;
|
|
}
|
|
}
|
|
prev_bh = bh;
|
|
bh = bh->b_reqnext;
|
|
kfree(prev_bh);
|
|
}
|
|
kfree(stage);
|
|
}
|
|
|
|
static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
|
|
{
|
|
__idetape_kfree_stage(stage);
|
|
}
|
|
|
|
/*
|
|
* idetape_remove_stage_head removes tape->first_stage from the pipeline.
|
|
* The caller should avoid race conditions.
|
|
*/
|
|
static void idetape_remove_stage_head (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->first_stage == NULL) {
|
|
printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
|
|
return;
|
|
}
|
|
if (tape->active_stage == tape->first_stage) {
|
|
printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
stage = tape->first_stage;
|
|
tape->first_stage = stage->next;
|
|
idetape_kfree_stage(tape, stage);
|
|
tape->nr_stages--;
|
|
if (tape->first_stage == NULL) {
|
|
tape->last_stage = NULL;
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->next_stage != NULL)
|
|
printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
|
|
if (tape->nr_stages)
|
|
printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This will free all the pipeline stages starting from new_last_stage->next
|
|
* to the end of the list, and point tape->last_stage to new_last_stage.
|
|
*/
|
|
static void idetape_abort_pipeline(ide_drive_t *drive,
|
|
idetape_stage_t *new_last_stage)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage = new_last_stage->next;
|
|
idetape_stage_t *nstage;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name);
|
|
#endif
|
|
while (stage) {
|
|
nstage = stage->next;
|
|
idetape_kfree_stage(tape, stage);
|
|
--tape->nr_stages;
|
|
--tape->nr_pending_stages;
|
|
stage = nstage;
|
|
}
|
|
if (new_last_stage)
|
|
new_last_stage->next = NULL;
|
|
tape->last_stage = new_last_stage;
|
|
tape->next_stage = NULL;
|
|
}
|
|
|
|
/*
|
|
* idetape_end_request is used to finish servicing a request, and to
|
|
* insert a pending pipeline request into the main device queue.
|
|
*/
|
|
static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
|
|
{
|
|
struct request *rq = HWGROUP(drive)->rq;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
int error;
|
|
int remove_stage = 0;
|
|
idetape_stage_t *active_stage;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_end_request\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
switch (uptodate) {
|
|
case 0: error = IDETAPE_ERROR_GENERAL; break;
|
|
case 1: error = 0; break;
|
|
default: error = uptodate;
|
|
}
|
|
rq->errors = error;
|
|
if (error)
|
|
tape->failed_pc = NULL;
|
|
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
|
|
/* The request was a pipelined data transfer request */
|
|
if (tape->active_data_request == rq) {
|
|
active_stage = tape->active_stage;
|
|
tape->active_stage = NULL;
|
|
tape->active_data_request = NULL;
|
|
tape->nr_pending_stages--;
|
|
if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
|
|
remove_stage = 1;
|
|
if (error) {
|
|
set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
if (error == IDETAPE_ERROR_EOD)
|
|
idetape_abort_pipeline(drive, active_stage);
|
|
}
|
|
} else if (rq->cmd[0] & REQ_IDETAPE_READ) {
|
|
if (error == IDETAPE_ERROR_EOD) {
|
|
set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
idetape_abort_pipeline(drive, active_stage);
|
|
}
|
|
}
|
|
if (tape->next_stage != NULL) {
|
|
idetape_active_next_stage(drive);
|
|
|
|
/*
|
|
* Insert the next request into the request queue.
|
|
*/
|
|
(void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
|
|
} else if (!error) {
|
|
idetape_increase_max_pipeline_stages(drive);
|
|
}
|
|
}
|
|
ide_end_drive_cmd(drive, 0, 0);
|
|
// blkdev_dequeue_request(rq);
|
|
// drive->rq = NULL;
|
|
// end_that_request_last(rq);
|
|
|
|
if (remove_stage)
|
|
idetape_remove_stage_head(drive);
|
|
if (tape->active_data_request == NULL)
|
|
clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
if (!tape->pc->error) {
|
|
idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer);
|
|
idetape_end_request(drive, 1, 0);
|
|
} else {
|
|
printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
|
|
idetape_end_request(drive, 0, 0);
|
|
}
|
|
return ide_stopped;
|
|
}
|
|
|
|
static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_REQUEST_SENSE_CMD;
|
|
pc->c[4] = 20;
|
|
pc->request_transfer = 20;
|
|
pc->callback = &idetape_request_sense_callback;
|
|
}
|
|
|
|
static void idetape_init_rq(struct request *rq, u8 cmd)
|
|
{
|
|
memset(rq, 0, sizeof(*rq));
|
|
rq->flags = REQ_SPECIAL;
|
|
rq->cmd[0] = cmd;
|
|
}
|
|
|
|
/*
|
|
* idetape_queue_pc_head generates a new packet command request in front
|
|
* of the request queue, before the current request, so that it will be
|
|
* processed immediately, on the next pass through the driver.
|
|
*
|
|
* idetape_queue_pc_head is called from the request handling part of
|
|
* the driver (the "bottom" part). Safe storage for the request should
|
|
* be allocated with idetape_next_pc_storage and idetape_next_rq_storage
|
|
* before calling idetape_queue_pc_head.
|
|
*
|
|
* Memory for those requests is pre-allocated at initialization time, and
|
|
* is limited to IDETAPE_PC_STACK requests. We assume that we have enough
|
|
* space for the maximum possible number of inter-dependent packet commands.
|
|
*
|
|
* The higher level of the driver - The ioctl handler and the character
|
|
* device handling functions should queue request to the lower level part
|
|
* and wait for their completion using idetape_queue_pc_tail or
|
|
* idetape_queue_rw_tail.
|
|
*/
|
|
static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
|
|
{
|
|
struct ide_tape_obj *tape = drive->driver_data;
|
|
|
|
idetape_init_rq(rq, REQ_IDETAPE_PC1);
|
|
rq->buffer = (char *) pc;
|
|
rq->rq_disk = tape->disk;
|
|
(void) ide_do_drive_cmd(drive, rq, ide_preempt);
|
|
}
|
|
|
|
/*
|
|
* idetape_retry_pc is called when an error was detected during the
|
|
* last packet command. We queue a request sense packet command in
|
|
* the head of the request list.
|
|
*/
|
|
static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc;
|
|
struct request *rq;
|
|
atapi_error_t error;
|
|
|
|
error.all = HWIF(drive)->INB(IDE_ERROR_REG);
|
|
pc = idetape_next_pc_storage(drive);
|
|
rq = idetape_next_rq_storage(drive);
|
|
idetape_create_request_sense_cmd(pc);
|
|
set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
|
|
idetape_queue_pc_head(drive, pc, rq);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* idetape_postpone_request postpones the current request so that
|
|
* ide.c will be able to service requests from another device on
|
|
* the same hwgroup while we are polling for DSC.
|
|
*/
|
|
static void idetape_postpone_request (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: idetape_postpone_request\n");
|
|
#endif
|
|
tape->postponed_rq = HWGROUP(drive)->rq;
|
|
ide_stall_queue(drive, tape->dsc_polling_frequency);
|
|
}
|
|
|
|
/*
|
|
* idetape_pc_intr is the usual interrupt handler which will be called
|
|
* during a packet command. We will transfer some of the data (as
|
|
* requested by the drive) and will re-point interrupt handler to us.
|
|
* When data transfer is finished, we will act according to the
|
|
* algorithm described before idetape_issue_packet_command.
|
|
*
|
|
*/
|
|
static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
atapi_status_t status;
|
|
atapi_bcount_t bcount;
|
|
atapi_ireason_t ireason;
|
|
idetape_pc_t *pc = tape->pc;
|
|
|
|
unsigned int temp;
|
|
#if SIMULATE_ERRORS
|
|
static int error_sim_count = 0;
|
|
#endif
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_pc_intr "
|
|
"interrupt handler\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
/* Clear the interrupt */
|
|
status.all = HWIF(drive)->INB(IDE_STATUS_REG);
|
|
|
|
if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
|
|
if (HWIF(drive)->ide_dma_end(drive) || status.b.check) {
|
|
/*
|
|
* A DMA error is sometimes expected. For example,
|
|
* if the tape is crossing a filemark during a
|
|
* READ command, it will issue an irq and position
|
|
* itself before the filemark, so that only a partial
|
|
* data transfer will occur (which causes the DMA
|
|
* error). In that case, we will later ask the tape
|
|
* how much bytes of the original request were
|
|
* actually transferred (we can't receive that
|
|
* information from the DMA engine on most chipsets).
|
|
*/
|
|
|
|
/*
|
|
* On the contrary, a DMA error is never expected;
|
|
* it usually indicates a hardware error or abort.
|
|
* If the tape crosses a filemark during a READ
|
|
* command, it will issue an irq and position itself
|
|
* after the filemark (not before). Only a partial
|
|
* data transfer will occur, but no DMA error.
|
|
* (AS, 19 Apr 2001)
|
|
*/
|
|
set_bit(PC_DMA_ERROR, &pc->flags);
|
|
} else {
|
|
pc->actually_transferred = pc->request_transfer;
|
|
idetape_update_buffers(pc);
|
|
}
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: DMA finished\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
}
|
|
|
|
/* No more interrupts */
|
|
if (!status.b.drq) {
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
|
|
|
|
local_irq_enable();
|
|
|
|
#if SIMULATE_ERRORS
|
|
if ((pc->c[0] == IDETAPE_WRITE_CMD ||
|
|
pc->c[0] == IDETAPE_READ_CMD) &&
|
|
(++error_sim_count % 100) == 0) {
|
|
printk(KERN_INFO "ide-tape: %s: simulating error\n",
|
|
tape->name);
|
|
status.b.check = 1;
|
|
}
|
|
#endif
|
|
if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD)
|
|
status.b.check = 0;
|
|
if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) { /* Error detected */
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 1)
|
|
printk(KERN_INFO "ide-tape: %s: I/O error\n",
|
|
tape->name);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
|
|
printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
|
|
return ide_do_reset(drive);
|
|
}
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 1)
|
|
printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
|
|
#endif
|
|
/* Retry operation */
|
|
return idetape_retry_pc(drive);
|
|
}
|
|
pc->error = 0;
|
|
if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
|
|
!status.b.dsc) {
|
|
/* Media access command */
|
|
tape->dsc_polling_start = jiffies;
|
|
tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
|
|
tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
|
|
/* Allow ide.c to handle other requests */
|
|
idetape_postpone_request(drive);
|
|
return ide_stopped;
|
|
}
|
|
if (tape->failed_pc == pc)
|
|
tape->failed_pc = NULL;
|
|
/* Command finished - Call the callback function */
|
|
return pc->callback(drive);
|
|
}
|
|
if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
|
|
printk(KERN_ERR "ide-tape: The tape wants to issue more "
|
|
"interrupts in DMA mode\n");
|
|
printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
|
|
(void)__ide_dma_off(drive);
|
|
return ide_do_reset(drive);
|
|
}
|
|
/* Get the number of bytes to transfer on this interrupt. */
|
|
bcount.b.high = hwif->INB(IDE_BCOUNTH_REG);
|
|
bcount.b.low = hwif->INB(IDE_BCOUNTL_REG);
|
|
|
|
ireason.all = hwif->INB(IDE_IREASON_REG);
|
|
|
|
if (ireason.b.cod) {
|
|
printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
|
|
return ide_do_reset(drive);
|
|
}
|
|
if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) {
|
|
/* Hopefully, we will never get here */
|
|
printk(KERN_ERR "ide-tape: We wanted to %s, ",
|
|
ireason.b.io ? "Write":"Read");
|
|
printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
|
|
ireason.b.io ? "Read":"Write");
|
|
return ide_do_reset(drive);
|
|
}
|
|
if (!test_bit(PC_WRITING, &pc->flags)) {
|
|
/* Reading - Check that we have enough space */
|
|
temp = pc->actually_transferred + bcount.all;
|
|
if (temp > pc->request_transfer) {
|
|
if (temp > pc->buffer_size) {
|
|
printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
|
|
idetape_discard_data(drive, bcount.all);
|
|
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
|
|
return ide_started;
|
|
}
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
}
|
|
}
|
|
if (test_bit(PC_WRITING, &pc->flags)) {
|
|
if (pc->bh != NULL)
|
|
idetape_output_buffers(drive, pc, bcount.all);
|
|
else
|
|
/* Write the current buffer */
|
|
HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
|
|
} else {
|
|
if (pc->bh != NULL)
|
|
idetape_input_buffers(drive, pc, bcount.all);
|
|
else
|
|
/* Read the current buffer */
|
|
HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
|
|
}
|
|
/* Update the current position */
|
|
pc->actually_transferred += bcount.all;
|
|
pc->current_position += bcount.all;
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all);
|
|
#endif
|
|
/* And set the interrupt handler again */
|
|
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
|
|
return ide_started;
|
|
}
|
|
|
|
/*
|
|
* Packet Command Interface
|
|
*
|
|
* The current Packet Command is available in tape->pc, and will not
|
|
* change until we finish handling it. Each packet command is associated
|
|
* with a callback function that will be called when the command is
|
|
* finished.
|
|
*
|
|
* The handling will be done in three stages:
|
|
*
|
|
* 1. idetape_issue_packet_command will send the packet command to the
|
|
* drive, and will set the interrupt handler to idetape_pc_intr.
|
|
*
|
|
* 2. On each interrupt, idetape_pc_intr will be called. This step
|
|
* will be repeated until the device signals us that no more
|
|
* interrupts will be issued.
|
|
*
|
|
* 3. ATAPI Tape media access commands have immediate status with a
|
|
* delayed process. In case of a successful initiation of a
|
|
* media access packet command, the DSC bit will be set when the
|
|
* actual execution of the command is finished.
|
|
* Since the tape drive will not issue an interrupt, we have to
|
|
* poll for this event. In this case, we define the request as
|
|
* "low priority request" by setting rq_status to
|
|
* IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
|
|
* the driver.
|
|
*
|
|
* ide.c will then give higher priority to requests which
|
|
* originate from the other device, until will change rq_status
|
|
* to RQ_ACTIVE.
|
|
*
|
|
* 4. When the packet command is finished, it will be checked for errors.
|
|
*
|
|
* 5. In case an error was found, we queue a request sense packet
|
|
* command in front of the request queue and retry the operation
|
|
* up to IDETAPE_MAX_PC_RETRIES times.
|
|
*
|
|
* 6. In case no error was found, or we decided to give up and not
|
|
* to retry again, the callback function will be called and then
|
|
* we will handle the next request.
|
|
*
|
|
*/
|
|
static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = tape->pc;
|
|
atapi_ireason_t ireason;
|
|
int retries = 100;
|
|
ide_startstop_t startstop;
|
|
|
|
if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
|
|
printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
|
|
return startstop;
|
|
}
|
|
ireason.all = hwif->INB(IDE_IREASON_REG);
|
|
while (retries-- && (!ireason.b.cod || ireason.b.io)) {
|
|
printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
|
|
"a packet command, retrying\n");
|
|
udelay(100);
|
|
ireason.all = hwif->INB(IDE_IREASON_REG);
|
|
if (retries == 0) {
|
|
printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
|
|
"issuing a packet command, ignoring\n");
|
|
ireason.b.cod = 1;
|
|
ireason.b.io = 0;
|
|
}
|
|
}
|
|
if (!ireason.b.cod || ireason.b.io) {
|
|
printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
|
|
"a packet command\n");
|
|
return ide_do_reset(drive);
|
|
}
|
|
/* Set the interrupt routine */
|
|
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
|
|
#ifdef CONFIG_BLK_DEV_IDEDMA
|
|
/* Begin DMA, if necessary */
|
|
if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
|
|
hwif->dma_start(drive);
|
|
#endif
|
|
/* Send the actual packet */
|
|
HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
|
|
return ide_started;
|
|
}
|
|
|
|
static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
atapi_bcount_t bcount;
|
|
int dma_ok = 0;
|
|
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD &&
|
|
pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
|
|
printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
|
|
"Two request sense in serial were issued\n");
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
|
|
if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
|
|
tape->failed_pc = pc;
|
|
/* Set the current packet command */
|
|
tape->pc = pc;
|
|
|
|
if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
|
|
test_bit(PC_ABORT, &pc->flags)) {
|
|
/*
|
|
* We will "abort" retrying a packet command in case
|
|
* a legitimate error code was received (crossing a
|
|
* filemark, or end of the media, for example).
|
|
*/
|
|
if (!test_bit(PC_ABORT, &pc->flags)) {
|
|
if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD &&
|
|
tape->sense_key == 2 && tape->asc == 4 &&
|
|
(tape->ascq == 1 || tape->ascq == 8))) {
|
|
printk(KERN_ERR "ide-tape: %s: I/O error, "
|
|
"pc = %2x, key = %2x, "
|
|
"asc = %2x, ascq = %2x\n",
|
|
tape->name, pc->c[0],
|
|
tape->sense_key, tape->asc,
|
|
tape->ascq);
|
|
}
|
|
/* Giving up */
|
|
pc->error = IDETAPE_ERROR_GENERAL;
|
|
}
|
|
tape->failed_pc = NULL;
|
|
return pc->callback(drive);
|
|
}
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
pc->retries++;
|
|
/* We haven't transferred any data yet */
|
|
pc->actually_transferred = 0;
|
|
pc->current_position = pc->buffer;
|
|
/* Request to transfer the entire buffer at once */
|
|
bcount.all = pc->request_transfer;
|
|
|
|
if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
|
|
printk(KERN_WARNING "ide-tape: DMA disabled, "
|
|
"reverting to PIO\n");
|
|
(void)__ide_dma_off(drive);
|
|
}
|
|
if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
|
|
dma_ok = !hwif->dma_setup(drive);
|
|
|
|
if (IDE_CONTROL_REG)
|
|
hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
|
|
hwif->OUTB(dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */
|
|
hwif->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
|
|
hwif->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
|
|
hwif->OUTB(drive->select.all, IDE_SELECT_REG);
|
|
if (dma_ok) /* Will begin DMA later */
|
|
set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
|
|
if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
|
|
ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL);
|
|
hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
|
|
return ide_started;
|
|
} else {
|
|
hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
|
|
return idetape_transfer_pc(drive);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* General packet command callback function.
|
|
*/
|
|
static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* A mode sense command is used to "sense" tape parameters.
|
|
*/
|
|
static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_MODE_SENSE_CMD;
|
|
if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
|
|
pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
|
|
pc->c[2] = page_code;
|
|
/*
|
|
* Changed pc->c[3] to 0 (255 will at best return unused info).
|
|
*
|
|
* For SCSI this byte is defined as subpage instead of high byte
|
|
* of length and some IDE drives seem to interpret it this way
|
|
* and return an error when 255 is used.
|
|
*/
|
|
pc->c[3] = 0;
|
|
pc->c[4] = 255; /* (We will just discard data in that case) */
|
|
if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
|
|
pc->request_transfer = 12;
|
|
else if (page_code == IDETAPE_CAPABILITIES_PAGE)
|
|
pc->request_transfer = 24;
|
|
else
|
|
pc->request_transfer = 50;
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void calculate_speeds(ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int full = 125, empty = 75;
|
|
|
|
if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
|
|
tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
|
|
tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
|
|
tape->controlled_last_pipeline_head = tape->pipeline_head;
|
|
tape->controlled_pipeline_head_time = jiffies;
|
|
}
|
|
if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
|
|
tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
|
|
else if (time_after(jiffies, tape->controlled_previous_head_time))
|
|
tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
|
|
|
|
if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
|
|
/* -1 for read mode error recovery */
|
|
if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
|
|
tape->uncontrolled_pipeline_head_time = jiffies;
|
|
tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
|
|
}
|
|
} else {
|
|
tape->uncontrolled_previous_head_time = jiffies;
|
|
tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
|
|
if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
|
|
tape->uncontrolled_pipeline_head_time = jiffies;
|
|
}
|
|
}
|
|
tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
|
|
if (tape->speed_control == 0) {
|
|
tape->max_insert_speed = 5000;
|
|
} else if (tape->speed_control == 1) {
|
|
if (tape->nr_pending_stages >= tape->max_stages / 2)
|
|
tape->max_insert_speed = tape->pipeline_head_speed +
|
|
(1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
|
|
else
|
|
tape->max_insert_speed = 500 +
|
|
(tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
|
|
if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
|
|
tape->max_insert_speed = 5000;
|
|
} else if (tape->speed_control == 2) {
|
|
tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
|
|
(tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
|
|
} else
|
|
tape->max_insert_speed = tape->speed_control;
|
|
tape->max_insert_speed = max(tape->max_insert_speed, 500);
|
|
}
|
|
|
|
static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = tape->pc;
|
|
atapi_status_t status;
|
|
|
|
status.all = HWIF(drive)->INB(IDE_STATUS_REG);
|
|
if (status.b.dsc) {
|
|
if (status.b.check) {
|
|
/* Error detected */
|
|
if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD)
|
|
printk(KERN_ERR "ide-tape: %s: I/O error, ",
|
|
tape->name);
|
|
/* Retry operation */
|
|
return idetape_retry_pc(drive);
|
|
}
|
|
pc->error = 0;
|
|
if (tape->failed_pc == pc)
|
|
tape->failed_pc = NULL;
|
|
} else {
|
|
pc->error = IDETAPE_ERROR_GENERAL;
|
|
tape->failed_pc = NULL;
|
|
}
|
|
return pc->callback(drive);
|
|
}
|
|
|
|
static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
struct request *rq = HWGROUP(drive)->rq;
|
|
int blocks = tape->pc->actually_transferred / tape->tape_block_size;
|
|
|
|
tape->avg_size += blocks * tape->tape_block_size;
|
|
tape->insert_size += blocks * tape->tape_block_size;
|
|
if (tape->insert_size > 1024 * 1024)
|
|
tape->measure_insert_time = 1;
|
|
if (tape->measure_insert_time) {
|
|
tape->measure_insert_time = 0;
|
|
tape->insert_time = jiffies;
|
|
tape->insert_size = 0;
|
|
}
|
|
if (time_after(jiffies, tape->insert_time))
|
|
tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
|
|
if (jiffies - tape->avg_time >= HZ) {
|
|
tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
|
|
tape->avg_size = 0;
|
|
tape->avg_time = jiffies;
|
|
}
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
tape->first_frame_position += blocks;
|
|
rq->current_nr_sectors -= blocks;
|
|
|
|
if (!tape->pc->error)
|
|
idetape_end_request(drive, 1, 0);
|
|
else
|
|
idetape_end_request(drive, tape->pc->error, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_READ_CMD;
|
|
put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
|
|
pc->c[1] = 1;
|
|
pc->callback = &idetape_rw_callback;
|
|
pc->bh = bh;
|
|
atomic_set(&bh->b_count, 0);
|
|
pc->buffer = NULL;
|
|
pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
|
|
if (pc->request_transfer == tape->stage_size)
|
|
set_bit(PC_DMA_RECOMMENDED, &pc->flags);
|
|
}
|
|
|
|
static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
|
|
{
|
|
int size = 32768;
|
|
struct idetape_bh *p = bh;
|
|
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_READ_BUFFER_CMD;
|
|
pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
|
|
pc->c[7] = size >> 8;
|
|
pc->c[8] = size & 0xff;
|
|
pc->callback = &idetape_pc_callback;
|
|
pc->bh = bh;
|
|
atomic_set(&bh->b_count, 0);
|
|
pc->buffer = NULL;
|
|
while (p) {
|
|
atomic_set(&p->b_count, 0);
|
|
p = p->b_reqnext;
|
|
}
|
|
pc->request_transfer = pc->buffer_size = size;
|
|
}
|
|
|
|
static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_WRITE_CMD;
|
|
put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
|
|
pc->c[1] = 1;
|
|
pc->callback = &idetape_rw_callback;
|
|
set_bit(PC_WRITING, &pc->flags);
|
|
pc->bh = bh;
|
|
pc->b_data = bh->b_data;
|
|
pc->b_count = atomic_read(&bh->b_count);
|
|
pc->buffer = NULL;
|
|
pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
|
|
if (pc->request_transfer == tape->stage_size)
|
|
set_bit(PC_DMA_RECOMMENDED, &pc->flags);
|
|
}
|
|
|
|
/*
|
|
* idetape_do_request is our request handling function.
|
|
*/
|
|
static ide_startstop_t idetape_do_request(ide_drive_t *drive,
|
|
struct request *rq, sector_t block)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = NULL;
|
|
struct request *postponed_rq = tape->postponed_rq;
|
|
atapi_status_t status;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
#if 0
|
|
if (tape->debug_level >= 5)
|
|
printk(KERN_INFO "ide-tape: rq_status: %d, "
|
|
"dev: %s, cmd: %ld, errors: %d\n", rq->rq_status,
|
|
rq->rq_disk->disk_name, rq->cmd[0], rq->errors);
|
|
#endif
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: sector: %ld, "
|
|
"nr_sectors: %ld, current_nr_sectors: %d\n",
|
|
rq->sector, rq->nr_sectors, rq->current_nr_sectors);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
if ((rq->flags & REQ_SPECIAL) == 0) {
|
|
/*
|
|
* We do not support buffer cache originated requests.
|
|
*/
|
|
printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
|
|
"request queue (%ld)\n", drive->name, rq->flags);
|
|
ide_end_request(drive, 0, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* Retry a failed packet command
|
|
*/
|
|
if (tape->failed_pc != NULL &&
|
|
tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
|
|
return idetape_issue_packet_command(drive, tape->failed_pc);
|
|
}
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (postponed_rq != NULL)
|
|
if (rq != postponed_rq) {
|
|
printk(KERN_ERR "ide-tape: ide-tape.c bug - "
|
|
"Two DSC requests were queued\n");
|
|
idetape_end_request(drive, 0, 0);
|
|
return ide_stopped;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
|
|
tape->postponed_rq = NULL;
|
|
|
|
/*
|
|
* If the tape is still busy, postpone our request and service
|
|
* the other device meanwhile.
|
|
*/
|
|
status.all = HWIF(drive)->INB(IDE_STATUS_REG);
|
|
|
|
if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
|
|
set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
|
|
|
|
if (drive->post_reset == 1) {
|
|
set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
|
|
drive->post_reset = 0;
|
|
}
|
|
|
|
if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
|
|
tape->measure_insert_time = 1;
|
|
if (time_after(jiffies, tape->insert_time))
|
|
tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
|
|
calculate_speeds(drive);
|
|
if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
|
|
!status.b.dsc) {
|
|
if (postponed_rq == NULL) {
|
|
tape->dsc_polling_start = jiffies;
|
|
tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
|
|
tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
|
|
} else if (time_after(jiffies, tape->dsc_timeout)) {
|
|
printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
|
|
tape->name);
|
|
if (rq->cmd[0] & REQ_IDETAPE_PC2) {
|
|
idetape_media_access_finished(drive);
|
|
return ide_stopped;
|
|
} else {
|
|
return ide_do_reset(drive);
|
|
}
|
|
} else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD)
|
|
tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
|
|
idetape_postpone_request(drive);
|
|
return ide_stopped;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_READ) {
|
|
tape->buffer_head++;
|
|
#if USE_IOTRACE
|
|
IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
|
|
#endif
|
|
tape->postpone_cnt = 0;
|
|
pc = idetape_next_pc_storage(drive);
|
|
idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
|
|
tape->buffer_head++;
|
|
#if USE_IOTRACE
|
|
IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
|
|
#endif
|
|
tape->postpone_cnt = 0;
|
|
pc = idetape_next_pc_storage(drive);
|
|
idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
|
|
tape->postpone_cnt = 0;
|
|
pc = idetape_next_pc_storage(drive);
|
|
idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_PC1) {
|
|
pc = (idetape_pc_t *) rq->buffer;
|
|
rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
|
|
rq->cmd[0] |= REQ_IDETAPE_PC2;
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_PC2) {
|
|
idetape_media_access_finished(drive);
|
|
return ide_stopped;
|
|
}
|
|
BUG();
|
|
out:
|
|
return idetape_issue_packet_command(drive, pc);
|
|
}
|
|
|
|
/*
|
|
* Pipeline related functions
|
|
*/
|
|
static inline int idetape_pipeline_active (idetape_tape_t *tape)
|
|
{
|
|
int rc1, rc2;
|
|
|
|
rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
|
|
rc2 = (tape->active_data_request != NULL);
|
|
return rc1;
|
|
}
|
|
|
|
/*
|
|
* idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
|
|
* stage, along with all the necessary small buffers which together make
|
|
* a buffer of size tape->stage_size (or a bit more). We attempt to
|
|
* combine sequential pages as much as possible.
|
|
*
|
|
* Returns a pointer to the new allocated stage, or NULL if we
|
|
* can't (or don't want to) allocate a stage.
|
|
*
|
|
* Pipeline stages are optional and are used to increase performance.
|
|
* If we can't allocate them, we'll manage without them.
|
|
*/
|
|
static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
|
|
{
|
|
idetape_stage_t *stage;
|
|
struct idetape_bh *prev_bh, *bh;
|
|
int pages = tape->pages_per_stage;
|
|
char *b_data = NULL;
|
|
|
|
if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
|
|
return NULL;
|
|
stage->next = NULL;
|
|
|
|
bh = stage->bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
|
|
if (bh == NULL)
|
|
goto abort;
|
|
bh->b_reqnext = NULL;
|
|
if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
|
|
goto abort;
|
|
if (clear)
|
|
memset(bh->b_data, 0, PAGE_SIZE);
|
|
bh->b_size = PAGE_SIZE;
|
|
atomic_set(&bh->b_count, full ? bh->b_size : 0);
|
|
|
|
while (--pages) {
|
|
if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
|
|
goto abort;
|
|
if (clear)
|
|
memset(b_data, 0, PAGE_SIZE);
|
|
if (bh->b_data == b_data + PAGE_SIZE) {
|
|
bh->b_size += PAGE_SIZE;
|
|
bh->b_data -= PAGE_SIZE;
|
|
if (full)
|
|
atomic_add(PAGE_SIZE, &bh->b_count);
|
|
continue;
|
|
}
|
|
if (b_data == bh->b_data + bh->b_size) {
|
|
bh->b_size += PAGE_SIZE;
|
|
if (full)
|
|
atomic_add(PAGE_SIZE, &bh->b_count);
|
|
continue;
|
|
}
|
|
prev_bh = bh;
|
|
if ((bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
|
|
free_page((unsigned long) b_data);
|
|
goto abort;
|
|
}
|
|
bh->b_reqnext = NULL;
|
|
bh->b_data = b_data;
|
|
bh->b_size = PAGE_SIZE;
|
|
atomic_set(&bh->b_count, full ? bh->b_size : 0);
|
|
prev_bh->b_reqnext = bh;
|
|
}
|
|
bh->b_size -= tape->excess_bh_size;
|
|
if (full)
|
|
atomic_sub(tape->excess_bh_size, &bh->b_count);
|
|
return stage;
|
|
abort:
|
|
__idetape_kfree_stage(stage);
|
|
return NULL;
|
|
}
|
|
|
|
static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
|
|
{
|
|
idetape_stage_t *cache_stage = tape->cache_stage;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
if (tape->nr_stages >= tape->max_stages)
|
|
return NULL;
|
|
if (cache_stage != NULL) {
|
|
tape->cache_stage = NULL;
|
|
return cache_stage;
|
|
}
|
|
return __idetape_kmalloc_stage(tape, 0, 0);
|
|
}
|
|
|
|
static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
|
|
{
|
|
struct idetape_bh *bh = tape->bh;
|
|
int count;
|
|
|
|
while (n) {
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_copy_stage_from_user\n");
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
|
|
copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count);
|
|
n -= count;
|
|
atomic_add(count, &bh->b_count);
|
|
buf += count;
|
|
if (atomic_read(&bh->b_count) == bh->b_size) {
|
|
bh = bh->b_reqnext;
|
|
if (bh)
|
|
atomic_set(&bh->b_count, 0);
|
|
}
|
|
}
|
|
tape->bh = bh;
|
|
}
|
|
|
|
static void idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
|
|
{
|
|
struct idetape_bh *bh = tape->bh;
|
|
int count;
|
|
|
|
while (n) {
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_copy_stage_to_user\n");
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
count = min(tape->b_count, n);
|
|
copy_to_user(buf, tape->b_data, count);
|
|
n -= count;
|
|
tape->b_data += count;
|
|
tape->b_count -= count;
|
|
buf += count;
|
|
if (!tape->b_count) {
|
|
tape->bh = bh = bh->b_reqnext;
|
|
if (bh) {
|
|
tape->b_data = bh->b_data;
|
|
tape->b_count = atomic_read(&bh->b_count);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void idetape_init_merge_stage (idetape_tape_t *tape)
|
|
{
|
|
struct idetape_bh *bh = tape->merge_stage->bh;
|
|
|
|
tape->bh = bh;
|
|
if (tape->chrdev_direction == idetape_direction_write)
|
|
atomic_set(&bh->b_count, 0);
|
|
else {
|
|
tape->b_data = bh->b_data;
|
|
tape->b_count = atomic_read(&bh->b_count);
|
|
}
|
|
}
|
|
|
|
static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
|
|
{
|
|
struct idetape_bh *tmp;
|
|
|
|
tmp = stage->bh;
|
|
stage->bh = tape->merge_stage->bh;
|
|
tape->merge_stage->bh = tmp;
|
|
idetape_init_merge_stage(tape);
|
|
}
|
|
|
|
/*
|
|
* idetape_add_stage_tail adds a new stage at the end of the pipeline.
|
|
*/
|
|
static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
stage->next = NULL;
|
|
if (tape->last_stage != NULL)
|
|
tape->last_stage->next=stage;
|
|
else
|
|
tape->first_stage = tape->next_stage=stage;
|
|
tape->last_stage = stage;
|
|
if (tape->next_stage == NULL)
|
|
tape->next_stage = tape->last_stage;
|
|
tape->nr_stages++;
|
|
tape->nr_pending_stages++;
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
}
|
|
|
|
/*
|
|
* idetape_wait_for_request installs a completion in a pending request
|
|
* and sleeps until it is serviced.
|
|
*
|
|
* The caller should ensure that the request will not be serviced
|
|
* before we install the completion (usually by disabling interrupts).
|
|
*/
|
|
static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
|
|
{
|
|
DECLARE_COMPLETION(wait);
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (rq == NULL || (rq->flags & REQ_SPECIAL) == 0) {
|
|
printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
|
|
return;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
rq->waiting = &wait;
|
|
rq->end_io = blk_end_sync_rq;
|
|
spin_unlock_irq(&tape->spinlock);
|
|
wait_for_completion(&wait);
|
|
/* The stage and its struct request have been deallocated */
|
|
spin_lock_irq(&tape->spinlock);
|
|
}
|
|
|
|
static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_read_position_result_t *result;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
if (!tape->pc->error) {
|
|
result = (idetape_read_position_result_t *) tape->pc->buffer;
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
if (result->bpu) {
|
|
printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n");
|
|
clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
|
|
idetape_end_request(drive, 0, 0);
|
|
} else {
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block));
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
tape->partition = result->partition;
|
|
tape->first_frame_position = ntohl(result->first_block);
|
|
tape->last_frame_position = ntohl(result->last_block);
|
|
tape->blocks_in_buffer = result->blocks_in_buffer[2];
|
|
set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
|
|
idetape_end_request(drive, 1, 0);
|
|
}
|
|
} else {
|
|
idetape_end_request(drive, 0, 0);
|
|
}
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* idetape_create_write_filemark_cmd will:
|
|
*
|
|
* 1. Write a filemark if write_filemark=1.
|
|
* 2. Flush the device buffers without writing a filemark
|
|
* if write_filemark=0.
|
|
*
|
|
*/
|
|
static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
|
|
pc->c[4] = write_filemark;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD;
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
/*
|
|
* idetape_queue_pc_tail is based on the following functions:
|
|
*
|
|
* ide_do_drive_cmd from ide.c
|
|
* cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
|
|
*
|
|
* We add a special packet command request to the tail of the request
|
|
* queue, and wait for it to be serviced.
|
|
*
|
|
* This is not to be called from within the request handling part
|
|
* of the driver ! We allocate here data in the stack, and it is valid
|
|
* until the request is finished. This is not the case for the bottom
|
|
* part of the driver, where we are always leaving the functions to wait
|
|
* for an interrupt or a timer event.
|
|
*
|
|
* From the bottom part of the driver, we should allocate safe memory
|
|
* using idetape_next_pc_storage and idetape_next_rq_storage, and add
|
|
* the request to the request list without waiting for it to be serviced !
|
|
* In that case, we usually use idetape_queue_pc_head.
|
|
*/
|
|
static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
|
|
{
|
|
struct ide_tape_obj *tape = drive->driver_data;
|
|
struct request rq;
|
|
|
|
idetape_init_rq(&rq, REQ_IDETAPE_PC1);
|
|
rq.buffer = (char *) pc;
|
|
rq.rq_disk = tape->disk;
|
|
return ide_do_drive_cmd(drive, &rq, ide_wait);
|
|
}
|
|
|
|
static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
|
|
pc->c[4] = cmd;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
int load_attempted = 0;
|
|
|
|
/*
|
|
* Wait for the tape to become ready
|
|
*/
|
|
set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
|
|
timeout += jiffies;
|
|
while (time_before(jiffies, timeout)) {
|
|
idetape_create_test_unit_ready_cmd(&pc);
|
|
if (!__idetape_queue_pc_tail(drive, &pc))
|
|
return 0;
|
|
if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
|
|
|| (tape->asc == 0x3A)) { /* no media */
|
|
if (load_attempted)
|
|
return -ENOMEDIUM;
|
|
idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
|
|
__idetape_queue_pc_tail(drive, &pc);
|
|
load_attempted = 1;
|
|
/* not about to be ready */
|
|
} else if (!(tape->sense_key == 2 && tape->asc == 4 &&
|
|
(tape->ascq == 1 || tape->ascq == 8)))
|
|
return -EIO;
|
|
msleep(100);
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
|
|
{
|
|
return __idetape_queue_pc_tail(drive, pc);
|
|
}
|
|
|
|
static int idetape_flush_tape_buffers (ide_drive_t *drive)
|
|
{
|
|
idetape_pc_t pc;
|
|
int rc;
|
|
|
|
idetape_create_write_filemark_cmd(drive, &pc, 0);
|
|
if ((rc = idetape_queue_pc_tail(drive, &pc)))
|
|
return rc;
|
|
idetape_wait_ready(drive, 60 * 5 * HZ);
|
|
return 0;
|
|
}
|
|
|
|
static void idetape_create_read_position_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_READ_POSITION_CMD;
|
|
pc->request_transfer = 20;
|
|
pc->callback = &idetape_read_position_callback;
|
|
}
|
|
|
|
static int idetape_read_position (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
int position;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_read_position\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
idetape_create_read_position_cmd(&pc);
|
|
if (idetape_queue_pc_tail(drive, &pc))
|
|
return -1;
|
|
position = tape->first_frame_position;
|
|
return position;
|
|
}
|
|
|
|
static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_LOCATE_CMD;
|
|
pc->c[1] = 2;
|
|
put_unaligned(htonl(block), (unsigned int *) &pc->c[3]);
|
|
pc->c[8] = partition;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
if (!tape->capabilities.lock)
|
|
return 0;
|
|
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_PREVENT_CMD;
|
|
pc->c[4] = prevent;
|
|
pc->callback = &idetape_pc_callback;
|
|
return 1;
|
|
}
|
|
|
|
static int __idetape_discard_read_pipeline (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
int cnt;
|
|
|
|
if (tape->chrdev_direction != idetape_direction_read)
|
|
return 0;
|
|
|
|
/* Remove merge stage. */
|
|
cnt = tape->merge_stage_size / tape->tape_block_size;
|
|
if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
|
|
++cnt; /* Filemarks count as 1 sector */
|
|
tape->merge_stage_size = 0;
|
|
if (tape->merge_stage != NULL) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
}
|
|
|
|
/* Clear pipeline flags. */
|
|
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
|
|
/* Remove pipeline stages. */
|
|
if (tape->first_stage == NULL)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
tape->next_stage = NULL;
|
|
if (idetape_pipeline_active(tape))
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
|
|
while (tape->first_stage != NULL) {
|
|
struct request *rq_ptr = &tape->first_stage->rq;
|
|
|
|
cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
|
|
if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
|
|
++cnt;
|
|
idetape_remove_stage_head(drive);
|
|
}
|
|
tape->nr_pending_stages = 0;
|
|
tape->max_stages = tape->min_pipeline;
|
|
return cnt;
|
|
}
|
|
|
|
/*
|
|
* idetape_position_tape positions the tape to the requested block
|
|
* using the LOCATE packet command. A READ POSITION command is then
|
|
* issued to check where we are positioned.
|
|
*
|
|
* Like all higher level operations, we queue the commands at the tail
|
|
* of the request queue and wait for their completion.
|
|
*
|
|
*/
|
|
static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int retval;
|
|
idetape_pc_t pc;
|
|
|
|
if (tape->chrdev_direction == idetape_direction_read)
|
|
__idetape_discard_read_pipeline(drive);
|
|
idetape_wait_ready(drive, 60 * 5 * HZ);
|
|
idetape_create_locate_cmd(drive, &pc, block, partition, skip);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval)
|
|
return (retval);
|
|
|
|
idetape_create_read_position_cmd(&pc);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
}
|
|
|
|
static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int cnt;
|
|
int seek, position;
|
|
|
|
cnt = __idetape_discard_read_pipeline(drive);
|
|
if (restore_position) {
|
|
position = idetape_read_position(drive);
|
|
seek = position > cnt ? position - cnt : 0;
|
|
if (idetape_position_tape(drive, seek, 0, 0)) {
|
|
printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* idetape_queue_rw_tail generates a read/write request for the block
|
|
* device interface and wait for it to be serviced.
|
|
*/
|
|
static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
struct request rq;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (idetape_pipeline_active(tape)) {
|
|
printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
|
|
return (0);
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
|
|
idetape_init_rq(&rq, cmd);
|
|
rq.rq_disk = tape->disk;
|
|
rq.special = (void *)bh;
|
|
rq.sector = tape->first_frame_position;
|
|
rq.nr_sectors = rq.current_nr_sectors = blocks;
|
|
(void) ide_do_drive_cmd(drive, &rq, ide_wait);
|
|
|
|
if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
|
|
return 0;
|
|
|
|
if (tape->merge_stage)
|
|
idetape_init_merge_stage(tape);
|
|
if (rq.errors == IDETAPE_ERROR_GENERAL)
|
|
return -EIO;
|
|
return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
|
|
}
|
|
|
|
/*
|
|
* idetape_insert_pipeline_into_queue is used to start servicing the
|
|
* pipeline stages, starting from tape->next_stage.
|
|
*/
|
|
static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
if (tape->next_stage == NULL)
|
|
return;
|
|
if (!idetape_pipeline_active(tape)) {
|
|
set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
|
|
idetape_active_next_stage(drive);
|
|
(void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
|
|
}
|
|
}
|
|
|
|
static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_INQUIRY_CMD;
|
|
pc->c[4] = pc->request_transfer = 254;
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_REWIND_CMD;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
#if 0
|
|
static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length)
|
|
{
|
|
idetape_init_pc(pc);
|
|
set_bit(PC_WRITING, &pc->flags);
|
|
pc->c[0] = IDETAPE_MODE_SELECT_CMD;
|
|
pc->c[1] = 0x10;
|
|
put_unaligned(htons(length), (unsigned short *) &pc->c[3]);
|
|
pc->request_transfer = 255;
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
#endif
|
|
|
|
static void idetape_create_erase_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_ERASE_CMD;
|
|
pc->c[1] = 1;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = IDETAPE_SPACE_CMD;
|
|
put_unaligned(htonl(count), (unsigned int *) &pc->c[1]);
|
|
pc->c[1] = cmd;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_wait_first_stage (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (tape->first_stage == NULL)
|
|
return;
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (tape->active_stage == tape->first_stage)
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
}
|
|
|
|
/*
|
|
* idetape_add_chrdev_write_request tries to add a character device
|
|
* originated write request to our pipeline. In case we don't succeed,
|
|
* we revert to non-pipelined operation mode for this request.
|
|
*
|
|
* 1. Try to allocate a new pipeline stage.
|
|
* 2. If we can't, wait for more and more requests to be serviced
|
|
* and try again each time.
|
|
* 3. If we still can't allocate a stage, fallback to
|
|
* non-pipelined operation mode for this request.
|
|
*/
|
|
static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *new_stage;
|
|
unsigned long flags;
|
|
struct request *rq;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 3)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
/*
|
|
* Attempt to allocate a new stage.
|
|
* Pay special attention to possible race conditions.
|
|
*/
|
|
while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (idetape_pipeline_active(tape)) {
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
} else {
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
if (idetape_pipeline_active(tape))
|
|
continue;
|
|
/*
|
|
* Linux is short on memory. Fallback to
|
|
* non-pipelined operation mode for this request.
|
|
*/
|
|
return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
|
|
}
|
|
}
|
|
rq = &new_stage->rq;
|
|
idetape_init_rq(rq, REQ_IDETAPE_WRITE);
|
|
/* Doesn't actually matter - We always assume sequential access */
|
|
rq->sector = tape->first_frame_position;
|
|
rq->nr_sectors = rq->current_nr_sectors = blocks;
|
|
|
|
idetape_switch_buffers(tape, new_stage);
|
|
idetape_add_stage_tail(drive, new_stage);
|
|
tape->pipeline_head++;
|
|
#if USE_IOTRACE
|
|
IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
|
|
#endif
|
|
calculate_speeds(drive);
|
|
|
|
/*
|
|
* Estimate whether the tape has stopped writing by checking
|
|
* if our write pipeline is currently empty. If we are not
|
|
* writing anymore, wait for the pipeline to be full enough
|
|
* (90%) before starting to service requests, so that we will
|
|
* be able to keep up with the higher speeds of the tape.
|
|
*/
|
|
if (!idetape_pipeline_active(tape)) {
|
|
if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
|
|
tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
|
|
tape->measure_insert_time = 1;
|
|
tape->insert_time = jiffies;
|
|
tape->insert_size = 0;
|
|
tape->insert_speed = 0;
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
}
|
|
}
|
|
if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
|
|
/* Return a deferred error */
|
|
return -EIO;
|
|
return blocks;
|
|
}
|
|
|
|
/*
|
|
* idetape_wait_for_pipeline will wait until all pending pipeline
|
|
* requests are serviced. Typically called on device close.
|
|
*/
|
|
static void idetape_wait_for_pipeline (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
|
|
while (tape->next_stage || idetape_pipeline_active(tape)) {
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (idetape_pipeline_active(tape))
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
}
|
|
}
|
|
|
|
static void idetape_empty_write_pipeline (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int blocks, min;
|
|
struct idetape_bh *bh;
|
|
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->chrdev_direction != idetape_direction_write) {
|
|
printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
|
|
return;
|
|
}
|
|
if (tape->merge_stage_size > tape->stage_size) {
|
|
printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
|
|
tape->merge_stage_size = tape->stage_size;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
if (tape->merge_stage_size) {
|
|
blocks = tape->merge_stage_size / tape->tape_block_size;
|
|
if (tape->merge_stage_size % tape->tape_block_size) {
|
|
unsigned int i;
|
|
|
|
blocks++;
|
|
i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
|
|
bh = tape->bh->b_reqnext;
|
|
while (bh) {
|
|
atomic_set(&bh->b_count, 0);
|
|
bh = bh->b_reqnext;
|
|
}
|
|
bh = tape->bh;
|
|
while (i) {
|
|
if (bh == NULL) {
|
|
|
|
printk(KERN_INFO "ide-tape: bug, bh NULL\n");
|
|
break;
|
|
}
|
|
min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
|
|
memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
|
|
atomic_add(min, &bh->b_count);
|
|
i -= min;
|
|
bh = bh->b_reqnext;
|
|
}
|
|
}
|
|
(void) idetape_add_chrdev_write_request(drive, blocks);
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
idetape_wait_for_pipeline(drive);
|
|
if (tape->merge_stage != NULL) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
}
|
|
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
|
|
/*
|
|
* On the next backup, perform the feedback loop again.
|
|
* (I don't want to keep sense information between backups,
|
|
* as some systems are constantly on, and the system load
|
|
* can be totally different on the next backup).
|
|
*/
|
|
tape->max_stages = tape->min_pipeline;
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->first_stage != NULL ||
|
|
tape->next_stage != NULL ||
|
|
tape->last_stage != NULL ||
|
|
tape->nr_stages != 0) {
|
|
printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
|
|
"first_stage %p, next_stage %p, "
|
|
"last_stage %p, nr_stages %d\n",
|
|
tape->first_stage, tape->next_stage,
|
|
tape->last_stage, tape->nr_stages);
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
}
|
|
|
|
static void idetape_restart_speed_control (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
tape->restart_speed_control_req = 0;
|
|
tape->pipeline_head = 0;
|
|
tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
|
|
tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
|
|
tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
|
|
tape->uncontrolled_pipeline_head_speed = 0;
|
|
tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
|
|
tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
|
|
}
|
|
|
|
static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *new_stage;
|
|
struct request rq;
|
|
int bytes_read;
|
|
int blocks = tape->capabilities.ctl;
|
|
|
|
/* Initialize read operation */
|
|
if (tape->chrdev_direction != idetape_direction_read) {
|
|
if (tape->chrdev_direction == idetape_direction_write) {
|
|
idetape_empty_write_pipeline(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
}
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->merge_stage || tape->merge_stage_size) {
|
|
printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
|
|
return -ENOMEM;
|
|
tape->chrdev_direction = idetape_direction_read;
|
|
|
|
/*
|
|
* Issue a read 0 command to ensure that DSC handshake
|
|
* is switched from completion mode to buffer available
|
|
* mode.
|
|
* No point in issuing this if DSC overlap isn't supported,
|
|
* some drives (Seagate STT3401A) will return an error.
|
|
*/
|
|
if (drive->dsc_overlap) {
|
|
bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
|
|
if (bytes_read < 0) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
return bytes_read;
|
|
}
|
|
}
|
|
}
|
|
if (tape->restart_speed_control_req)
|
|
idetape_restart_speed_control(drive);
|
|
idetape_init_rq(&rq, REQ_IDETAPE_READ);
|
|
rq.sector = tape->first_frame_position;
|
|
rq.nr_sectors = rq.current_nr_sectors = blocks;
|
|
if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
|
|
tape->nr_stages < max_stages) {
|
|
new_stage = idetape_kmalloc_stage(tape);
|
|
while (new_stage != NULL) {
|
|
new_stage->rq = rq;
|
|
idetape_add_stage_tail(drive, new_stage);
|
|
if (tape->nr_stages >= max_stages)
|
|
break;
|
|
new_stage = idetape_kmalloc_stage(tape);
|
|
}
|
|
}
|
|
if (!idetape_pipeline_active(tape)) {
|
|
if (tape->nr_pending_stages >= 3 * max_stages / 4) {
|
|
tape->measure_insert_time = 1;
|
|
tape->insert_time = jiffies;
|
|
tape->insert_size = 0;
|
|
tape->insert_speed = 0;
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idetape_add_chrdev_read_request is called from idetape_chrdev_read
|
|
* to service a character device read request and add read-ahead
|
|
* requests to our pipeline.
|
|
*/
|
|
static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
struct request *rq_ptr;
|
|
int bytes_read;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
/*
|
|
* If we are at a filemark, return a read length of 0
|
|
*/
|
|
if (test_bit(IDETAPE_FILEMARK, &tape->flags))
|
|
return 0;
|
|
|
|
/*
|
|
* Wait for the next block to be available at the head
|
|
* of the pipeline
|
|
*/
|
|
idetape_initiate_read(drive, tape->max_stages);
|
|
if (tape->first_stage == NULL) {
|
|
if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
|
|
return 0;
|
|
return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
|
|
}
|
|
idetape_wait_first_stage(drive);
|
|
rq_ptr = &tape->first_stage->rq;
|
|
bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
|
|
rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
|
|
|
|
|
|
if (rq_ptr->errors == IDETAPE_ERROR_EOD)
|
|
return 0;
|
|
else {
|
|
idetape_switch_buffers(tape, tape->first_stage);
|
|
if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
|
|
set_bit(IDETAPE_FILEMARK, &tape->flags);
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
idetape_remove_stage_head(drive);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
tape->pipeline_head++;
|
|
#if USE_IOTRACE
|
|
IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
|
|
#endif
|
|
calculate_speeds(drive);
|
|
}
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (bytes_read > blocks * tape->tape_block_size) {
|
|
printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
|
|
bytes_read = blocks * tape->tape_block_size;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
return (bytes_read);
|
|
}
|
|
|
|
static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
struct idetape_bh *bh;
|
|
int blocks;
|
|
|
|
while (bcount) {
|
|
unsigned int count;
|
|
|
|
bh = tape->merge_stage->bh;
|
|
count = min(tape->stage_size, bcount);
|
|
bcount -= count;
|
|
blocks = count / tape->tape_block_size;
|
|
while (count) {
|
|
atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
|
|
memset(bh->b_data, 0, atomic_read(&bh->b_count));
|
|
count -= atomic_read(&bh->b_count);
|
|
bh = bh->b_reqnext;
|
|
}
|
|
idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
|
|
}
|
|
}
|
|
|
|
static int idetape_pipeline_size (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage;
|
|
struct request *rq;
|
|
int size = 0;
|
|
|
|
idetape_wait_for_pipeline(drive);
|
|
stage = tape->first_stage;
|
|
while (stage != NULL) {
|
|
rq = &stage->rq;
|
|
size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
|
|
if (rq->errors == IDETAPE_ERROR_FILEMARK)
|
|
size += tape->tape_block_size;
|
|
stage = stage->next;
|
|
}
|
|
size += tape->merge_stage_size;
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* Rewinds the tape to the Beginning Of the current Partition (BOP).
|
|
*
|
|
* We currently support only one partition.
|
|
*/
|
|
static int idetape_rewind_tape (ide_drive_t *drive)
|
|
{
|
|
int retval;
|
|
idetape_pc_t pc;
|
|
#if IDETAPE_DEBUG_LOG
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
idetape_create_rewind_cmd(drive, &pc);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval)
|
|
return retval;
|
|
|
|
idetape_create_read_position_cmd(&pc);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval)
|
|
return retval;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Our special ide-tape ioctl's.
|
|
*
|
|
* Currently there aren't any ioctl's.
|
|
* mtio.h compatible commands should be issued to the character device
|
|
* interface.
|
|
*/
|
|
static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_config_t config;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 4)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
switch (cmd) {
|
|
case 0x0340:
|
|
if (copy_from_user(&config, argp, sizeof (idetape_config_t)))
|
|
return -EFAULT;
|
|
tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
|
|
tape->max_stages = config.nr_stages;
|
|
break;
|
|
case 0x0350:
|
|
config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
|
|
config.nr_stages = tape->max_stages;
|
|
if (copy_to_user(argp, &config, sizeof (idetape_config_t)))
|
|
return -EFAULT;
|
|
break;
|
|
default:
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idetape_space_over_filemarks is now a bit more complicated than just
|
|
* passing the command to the tape since we may have crossed some
|
|
* filemarks during our pipelined read-ahead mode.
|
|
*
|
|
* As a minor side effect, the pipeline enables us to support MTFSFM when
|
|
* the filemark is in our internal pipeline even if the tape doesn't
|
|
* support spacing over filemarks in the reverse direction.
|
|
*/
|
|
static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
unsigned long flags;
|
|
int retval,count=0;
|
|
|
|
if (mt_count == 0)
|
|
return 0;
|
|
if (MTBSF == mt_op || MTBSFM == mt_op) {
|
|
if (!tape->capabilities.sprev)
|
|
return -EIO;
|
|
mt_count = - mt_count;
|
|
}
|
|
|
|
if (tape->chrdev_direction == idetape_direction_read) {
|
|
/*
|
|
* We have a read-ahead buffer. Scan it for crossed
|
|
* filemarks.
|
|
*/
|
|
tape->merge_stage_size = 0;
|
|
if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
|
|
++count;
|
|
while (tape->first_stage != NULL) {
|
|
if (count == mt_count) {
|
|
if (mt_op == MTFSFM)
|
|
set_bit(IDETAPE_FILEMARK, &tape->flags);
|
|
return 0;
|
|
}
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (tape->first_stage == tape->active_stage) {
|
|
/*
|
|
* We have reached the active stage in the read pipeline.
|
|
* There is no point in allowing the drive to continue
|
|
* reading any farther, so we stop the pipeline.
|
|
*
|
|
* This section should be moved to a separate subroutine,
|
|
* because a similar function is performed in
|
|
* __idetape_discard_read_pipeline(), for example.
|
|
*/
|
|
tape->next_stage = NULL;
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
idetape_wait_first_stage(drive);
|
|
tape->next_stage = tape->first_stage->next;
|
|
} else
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
|
|
++count;
|
|
idetape_remove_stage_head(drive);
|
|
}
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
}
|
|
|
|
/*
|
|
* The filemark was not found in our internal pipeline.
|
|
* Now we can issue the space command.
|
|
*/
|
|
switch (mt_op) {
|
|
case MTFSF:
|
|
case MTBSF:
|
|
idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTFSFM:
|
|
case MTBSFM:
|
|
if (!tape->capabilities.sprev)
|
|
return (-EIO);
|
|
retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
|
|
if (retval) return (retval);
|
|
count = (MTBSFM == mt_op ? 1 : -1);
|
|
return (idetape_space_over_filemarks(drive, MTFSF, count));
|
|
default:
|
|
printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
|
|
return (-EIO);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Our character device read / write functions.
|
|
*
|
|
* The tape is optimized to maximize throughput when it is transferring
|
|
* an integral number of the "continuous transfer limit", which is
|
|
* a parameter of the specific tape (26 KB on my particular tape).
|
|
* (32 kB for Onstream)
|
|
*
|
|
* As of version 1.3 of the driver, the character device provides an
|
|
* abstract continuous view of the media - any mix of block sizes (even 1
|
|
* byte) on the same backup/restore procedure is supported. The driver
|
|
* will internally convert the requests to the recommended transfer unit,
|
|
* so that an unmatch between the user's block size to the recommended
|
|
* size will only result in a (slightly) increased driver overhead, but
|
|
* will no longer hit performance.
|
|
* This is not applicable to Onstream.
|
|
*/
|
|
static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(file);
|
|
ide_drive_t *drive = tape->drive;
|
|
ssize_t bytes_read,temp, actually_read = 0, rc;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 3)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
if (tape->chrdev_direction != idetape_direction_read) {
|
|
if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
|
|
if (count > tape->tape_block_size &&
|
|
(count % tape->tape_block_size) == 0)
|
|
tape->user_bs_factor = count / tape->tape_block_size;
|
|
}
|
|
if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
|
|
return rc;
|
|
if (count == 0)
|
|
return (0);
|
|
if (tape->merge_stage_size) {
|
|
actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
|
|
idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read);
|
|
buf += actually_read;
|
|
tape->merge_stage_size -= actually_read;
|
|
count -= actually_read;
|
|
}
|
|
while (count >= tape->stage_size) {
|
|
bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
|
|
if (bytes_read <= 0)
|
|
goto finish;
|
|
idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read);
|
|
buf += bytes_read;
|
|
count -= bytes_read;
|
|
actually_read += bytes_read;
|
|
}
|
|
if (count) {
|
|
bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
|
|
if (bytes_read <= 0)
|
|
goto finish;
|
|
temp = min((unsigned long)count, (unsigned long)bytes_read);
|
|
idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp);
|
|
actually_read += temp;
|
|
tape->merge_stage_size = bytes_read-temp;
|
|
}
|
|
finish:
|
|
if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 2)
|
|
printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
|
|
#endif
|
|
idetape_space_over_filemarks(drive, MTFSF, 1);
|
|
return 0;
|
|
}
|
|
return actually_read;
|
|
}
|
|
|
|
static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(file);
|
|
ide_drive_t *drive = tape->drive;
|
|
ssize_t retval, actually_written = 0;
|
|
|
|
/* The drive is write protected. */
|
|
if (tape->write_prot)
|
|
return -EACCES;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 3)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
|
|
"count %Zd\n", count);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
/* Initialize write operation */
|
|
if (tape->chrdev_direction != idetape_direction_write) {
|
|
if (tape->chrdev_direction == idetape_direction_read)
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->merge_stage || tape->merge_stage_size) {
|
|
printk(KERN_ERR "ide-tape: merge_stage_size "
|
|
"should be 0 now\n");
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
|
|
return -ENOMEM;
|
|
tape->chrdev_direction = idetape_direction_write;
|
|
idetape_init_merge_stage(tape);
|
|
|
|
/*
|
|
* Issue a write 0 command to ensure that DSC handshake
|
|
* is switched from completion mode to buffer available
|
|
* mode.
|
|
* No point in issuing this if DSC overlap isn't supported,
|
|
* some drives (Seagate STT3401A) will return an error.
|
|
*/
|
|
if (drive->dsc_overlap) {
|
|
retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
|
|
if (retval < 0) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
return retval;
|
|
}
|
|
}
|
|
}
|
|
if (count == 0)
|
|
return (0);
|
|
if (tape->restart_speed_control_req)
|
|
idetape_restart_speed_control(drive);
|
|
if (tape->merge_stage_size) {
|
|
#if IDETAPE_DEBUG_BUGS
|
|
if (tape->merge_stage_size >= tape->stage_size) {
|
|
printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
#endif /* IDETAPE_DEBUG_BUGS */
|
|
actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
|
|
idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written);
|
|
buf += actually_written;
|
|
tape->merge_stage_size += actually_written;
|
|
count -= actually_written;
|
|
|
|
if (tape->merge_stage_size == tape->stage_size) {
|
|
tape->merge_stage_size = 0;
|
|
retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
|
|
if (retval <= 0)
|
|
return (retval);
|
|
}
|
|
}
|
|
while (count >= tape->stage_size) {
|
|
idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size);
|
|
buf += tape->stage_size;
|
|
count -= tape->stage_size;
|
|
retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
|
|
actually_written += tape->stage_size;
|
|
if (retval <= 0)
|
|
return (retval);
|
|
}
|
|
if (count) {
|
|
actually_written += count;
|
|
idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count);
|
|
tape->merge_stage_size += count;
|
|
}
|
|
return (actually_written);
|
|
}
|
|
|
|
static int idetape_write_filemark (ide_drive_t *drive)
|
|
{
|
|
idetape_pc_t pc;
|
|
|
|
/* Write a filemark */
|
|
idetape_create_write_filemark_cmd(drive, &pc, 1);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idetape_mtioctop is called from idetape_chrdev_ioctl when
|
|
* the general mtio MTIOCTOP ioctl is requested.
|
|
*
|
|
* We currently support the following mtio.h operations:
|
|
*
|
|
* MTFSF - Space over mt_count filemarks in the positive direction.
|
|
* The tape is positioned after the last spaced filemark.
|
|
*
|
|
* MTFSFM - Same as MTFSF, but the tape is positioned before the
|
|
* last filemark.
|
|
*
|
|
* MTBSF - Steps background over mt_count filemarks, tape is
|
|
* positioned before the last filemark.
|
|
*
|
|
* MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
|
|
*
|
|
* Note:
|
|
*
|
|
* MTBSF and MTBSFM are not supported when the tape doesn't
|
|
* support spacing over filemarks in the reverse direction.
|
|
* In this case, MTFSFM is also usually not supported (it is
|
|
* supported in the rare case in which we crossed the filemark
|
|
* during our read-ahead pipelined operation mode).
|
|
*
|
|
* MTWEOF - Writes mt_count filemarks. Tape is positioned after
|
|
* the last written filemark.
|
|
*
|
|
* MTREW - Rewinds tape.
|
|
*
|
|
* MTLOAD - Loads the tape.
|
|
*
|
|
* MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
|
|
* MTUNLOAD prevents further access until the media is replaced.
|
|
*
|
|
* MTNOP - Flushes tape buffers.
|
|
*
|
|
* MTRETEN - Retension media. This typically consists of one end
|
|
* to end pass on the media.
|
|
*
|
|
* MTEOM - Moves to the end of recorded data.
|
|
*
|
|
* MTERASE - Erases tape.
|
|
*
|
|
* MTSETBLK - Sets the user block size to mt_count bytes. If
|
|
* mt_count is 0, we will attempt to autodetect
|
|
* the block size.
|
|
*
|
|
* MTSEEK - Positions the tape in a specific block number, where
|
|
* each block is assumed to contain which user_block_size
|
|
* bytes.
|
|
*
|
|
* MTSETPART - Switches to another tape partition.
|
|
*
|
|
* MTLOCK - Locks the tape door.
|
|
*
|
|
* MTUNLOCK - Unlocks the tape door.
|
|
*
|
|
* The following commands are currently not supported:
|
|
*
|
|
* MTFSS, MTBSS, MTWSM, MTSETDENSITY,
|
|
* MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
|
|
*/
|
|
static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
int i,retval;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 1)
|
|
printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: "
|
|
"mt_op=%d, mt_count=%d\n", mt_op, mt_count);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
/*
|
|
* Commands which need our pipelined read-ahead stages.
|
|
*/
|
|
switch (mt_op) {
|
|
case MTFSF:
|
|
case MTFSFM:
|
|
case MTBSF:
|
|
case MTBSFM:
|
|
if (!mt_count)
|
|
return (0);
|
|
return (idetape_space_over_filemarks(drive,mt_op,mt_count));
|
|
default:
|
|
break;
|
|
}
|
|
switch (mt_op) {
|
|
case MTWEOF:
|
|
if (tape->write_prot)
|
|
return -EACCES;
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
for (i = 0; i < mt_count; i++) {
|
|
retval = idetape_write_filemark(drive);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
return (0);
|
|
case MTREW:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
if (idetape_rewind_tape(drive))
|
|
return -EIO;
|
|
return 0;
|
|
case MTLOAD:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTUNLOAD:
|
|
case MTOFFL:
|
|
/*
|
|
* If door is locked, attempt to unlock before
|
|
* attempting to eject.
|
|
*/
|
|
if (tape->door_locked) {
|
|
if (idetape_create_prevent_cmd(drive, &pc, 0))
|
|
if (!idetape_queue_pc_tail(drive, &pc))
|
|
tape->door_locked = DOOR_UNLOCKED;
|
|
}
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (!retval)
|
|
clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
|
|
return retval;
|
|
case MTNOP:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
return (idetape_flush_tape_buffers(drive));
|
|
case MTRETEN:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTEOM:
|
|
idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTERASE:
|
|
(void) idetape_rewind_tape(drive);
|
|
idetape_create_erase_cmd(&pc);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTSETBLK:
|
|
if (mt_count) {
|
|
if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
|
|
return -EIO;
|
|
tape->user_bs_factor = mt_count / tape->tape_block_size;
|
|
clear_bit(IDETAPE_DETECT_BS, &tape->flags);
|
|
} else
|
|
set_bit(IDETAPE_DETECT_BS, &tape->flags);
|
|
return 0;
|
|
case MTSEEK:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
|
|
case MTSETPART:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
return (idetape_position_tape(drive, 0, mt_count, 0));
|
|
case MTFSR:
|
|
case MTBSR:
|
|
case MTLOCK:
|
|
if (!idetape_create_prevent_cmd(drive, &pc, 1))
|
|
return 0;
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval) return retval;
|
|
tape->door_locked = DOOR_EXPLICITLY_LOCKED;
|
|
return 0;
|
|
case MTUNLOCK:
|
|
if (!idetape_create_prevent_cmd(drive, &pc, 0))
|
|
return 0;
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval) return retval;
|
|
tape->door_locked = DOOR_UNLOCKED;
|
|
return 0;
|
|
default:
|
|
printk(KERN_ERR "ide-tape: MTIO operation %d not "
|
|
"supported\n", mt_op);
|
|
return (-EIO);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Our character device ioctls.
|
|
*
|
|
* General mtio.h magnetic io commands are supported here, and not in
|
|
* the corresponding block interface.
|
|
*
|
|
* The following ioctls are supported:
|
|
*
|
|
* MTIOCTOP - Refer to idetape_mtioctop for detailed description.
|
|
*
|
|
* MTIOCGET - The mt_dsreg field in the returned mtget structure
|
|
* will be set to (user block size in bytes <<
|
|
* MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
|
|
*
|
|
* The mt_blkno is set to the current user block number.
|
|
* The other mtget fields are not supported.
|
|
*
|
|
* MTIOCPOS - The current tape "block position" is returned. We
|
|
* assume that each block contains user_block_size
|
|
* bytes.
|
|
*
|
|
* Our own ide-tape ioctls are supported on both interfaces.
|
|
*/
|
|
static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(file);
|
|
ide_drive_t *drive = tape->drive;
|
|
struct mtop mtop;
|
|
struct mtget mtget;
|
|
struct mtpos mtpos;
|
|
int block_offset = 0, position = tape->first_frame_position;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 3)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, "
|
|
"cmd=%u\n", cmd);
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
tape->restart_speed_control_req = 1;
|
|
if (tape->chrdev_direction == idetape_direction_write) {
|
|
idetape_empty_write_pipeline(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
}
|
|
if (cmd == MTIOCGET || cmd == MTIOCPOS) {
|
|
block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
|
|
if ((position = idetape_read_position(drive)) < 0)
|
|
return -EIO;
|
|
}
|
|
switch (cmd) {
|
|
case MTIOCTOP:
|
|
if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
|
|
return -EFAULT;
|
|
return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
|
|
case MTIOCGET:
|
|
memset(&mtget, 0, sizeof (struct mtget));
|
|
mtget.mt_type = MT_ISSCSI2;
|
|
mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
|
|
mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
|
|
if (tape->drv_write_prot) {
|
|
mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
|
|
}
|
|
if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
|
|
return -EFAULT;
|
|
return 0;
|
|
case MTIOCPOS:
|
|
mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
|
|
if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
|
|
return -EFAULT;
|
|
return 0;
|
|
default:
|
|
if (tape->chrdev_direction == idetape_direction_read)
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
return idetape_blkdev_ioctl(drive, cmd, arg);
|
|
}
|
|
}
|
|
|
|
static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive);
|
|
|
|
/*
|
|
* Our character device open function.
|
|
*/
|
|
static int idetape_chrdev_open (struct inode *inode, struct file *filp)
|
|
{
|
|
unsigned int minor = iminor(inode), i = minor & ~0xc0;
|
|
ide_drive_t *drive;
|
|
idetape_tape_t *tape;
|
|
idetape_pc_t pc;
|
|
int retval;
|
|
|
|
/*
|
|
* We really want to do nonseekable_open(inode, filp); here, but some
|
|
* versions of tar incorrectly call lseek on tapes and bail out if that
|
|
* fails. So we disallow pread() and pwrite(), but permit lseeks.
|
|
*/
|
|
filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
|
|
|
|
#if IDETAPE_DEBUG_LOG
|
|
printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
if (i >= MAX_HWIFS * MAX_DRIVES)
|
|
return -ENXIO;
|
|
|
|
if (!(tape = ide_tape_chrdev_get(i)))
|
|
return -ENXIO;
|
|
|
|
drive = tape->drive;
|
|
|
|
filp->private_data = tape;
|
|
|
|
if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
|
|
retval = -EBUSY;
|
|
goto out_put_tape;
|
|
}
|
|
|
|
retval = idetape_wait_ready(drive, 60 * HZ);
|
|
if (retval) {
|
|
clear_bit(IDETAPE_BUSY, &tape->flags);
|
|
printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
|
|
goto out_put_tape;
|
|
}
|
|
|
|
idetape_read_position(drive);
|
|
if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
|
|
(void)idetape_rewind_tape(drive);
|
|
|
|
if (tape->chrdev_direction != idetape_direction_read)
|
|
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
|
|
/* Read block size and write protect status from drive. */
|
|
idetape_get_blocksize_from_block_descriptor(drive);
|
|
|
|
/* Set write protect flag if device is opened as read-only. */
|
|
if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
|
|
tape->write_prot = 1;
|
|
else
|
|
tape->write_prot = tape->drv_write_prot;
|
|
|
|
/* Make sure drive isn't write protected if user wants to write. */
|
|
if (tape->write_prot) {
|
|
if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
|
|
(filp->f_flags & O_ACCMODE) == O_RDWR) {
|
|
clear_bit(IDETAPE_BUSY, &tape->flags);
|
|
retval = -EROFS;
|
|
goto out_put_tape;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lock the tape drive door so user can't eject.
|
|
*/
|
|
if (tape->chrdev_direction == idetape_direction_none) {
|
|
if (idetape_create_prevent_cmd(drive, &pc, 1)) {
|
|
if (!idetape_queue_pc_tail(drive, &pc)) {
|
|
if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
|
|
tape->door_locked = DOOR_LOCKED;
|
|
}
|
|
}
|
|
}
|
|
idetape_restart_speed_control(drive);
|
|
tape->restart_speed_control_req = 0;
|
|
return 0;
|
|
|
|
out_put_tape:
|
|
ide_tape_put(tape);
|
|
return retval;
|
|
}
|
|
|
|
static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
idetape_empty_write_pipeline(drive);
|
|
tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
|
|
if (tape->merge_stage != NULL) {
|
|
idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
}
|
|
idetape_write_filemark(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
}
|
|
|
|
/*
|
|
* Our character device release function.
|
|
*/
|
|
static int idetape_chrdev_release (struct inode *inode, struct file *filp)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(filp);
|
|
ide_drive_t *drive = tape->drive;
|
|
idetape_pc_t pc;
|
|
unsigned int minor = iminor(inode);
|
|
|
|
lock_kernel();
|
|
tape = drive->driver_data;
|
|
#if IDETAPE_DEBUG_LOG
|
|
if (tape->debug_level >= 3)
|
|
printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
|
|
#endif /* IDETAPE_DEBUG_LOG */
|
|
|
|
if (tape->chrdev_direction == idetape_direction_write)
|
|
idetape_write_release(drive, minor);
|
|
if (tape->chrdev_direction == idetape_direction_read) {
|
|
if (minor < 128)
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
else
|
|
idetape_wait_for_pipeline(drive);
|
|
}
|
|
if (tape->cache_stage != NULL) {
|
|
__idetape_kfree_stage(tape->cache_stage);
|
|
tape->cache_stage = NULL;
|
|
}
|
|
if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
|
|
(void) idetape_rewind_tape(drive);
|
|
if (tape->chrdev_direction == idetape_direction_none) {
|
|
if (tape->door_locked == DOOR_LOCKED) {
|
|
if (idetape_create_prevent_cmd(drive, &pc, 0)) {
|
|
if (!idetape_queue_pc_tail(drive, &pc))
|
|
tape->door_locked = DOOR_UNLOCKED;
|
|
}
|
|
}
|
|
}
|
|
clear_bit(IDETAPE_BUSY, &tape->flags);
|
|
ide_tape_put(tape);
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idetape_identify_device is called to check the contents of the
|
|
* ATAPI IDENTIFY command results. We return:
|
|
*
|
|
* 1 If the tape can be supported by us, based on the information
|
|
* we have so far.
|
|
*
|
|
* 0 If this tape driver is not currently supported by us.
|
|
*/
|
|
static int idetape_identify_device (ide_drive_t *drive)
|
|
{
|
|
struct idetape_id_gcw gcw;
|
|
struct hd_driveid *id = drive->id;
|
|
#if IDETAPE_DEBUG_INFO
|
|
unsigned short mask,i;
|
|
#endif /* IDETAPE_DEBUG_INFO */
|
|
|
|
if (drive->id_read == 0)
|
|
return 1;
|
|
|
|
*((unsigned short *) &gcw) = id->config;
|
|
|
|
#if IDETAPE_DEBUG_INFO
|
|
printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n");
|
|
printk(KERN_INFO "ide-tape: Protocol Type: ");
|
|
switch (gcw.protocol) {
|
|
case 0: case 1: printk("ATA\n");break;
|
|
case 2: printk("ATAPI\n");break;
|
|
case 3: printk("Reserved (Unknown to ide-tape)\n");break;
|
|
}
|
|
printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type);
|
|
switch (gcw.device_type) {
|
|
case 0: printk("Direct-access Device\n");break;
|
|
case 1: printk("Streaming Tape Device\n");break;
|
|
case 2: case 3: case 4: printk("Reserved\n");break;
|
|
case 5: printk("CD-ROM Device\n");break;
|
|
case 6: printk("Reserved\n");
|
|
case 7: printk("Optical memory Device\n");break;
|
|
case 0x1f: printk("Unknown or no Device type\n");break;
|
|
default: printk("Reserved\n");
|
|
}
|
|
printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n");
|
|
printk(KERN_INFO "ide-tape: Command Packet DRQ Type: ");
|
|
switch (gcw.drq_type) {
|
|
case 0: printk("Microprocessor DRQ\n");break;
|
|
case 1: printk("Interrupt DRQ\n");break;
|
|
case 2: printk("Accelerated DRQ\n");break;
|
|
case 3: printk("Reserved\n");break;
|
|
}
|
|
printk(KERN_INFO "ide-tape: Command Packet Size: ");
|
|
switch (gcw.packet_size) {
|
|
case 0: printk("12 bytes\n");break;
|
|
case 1: printk("16 bytes\n");break;
|
|
default: printk("Reserved\n");break;
|
|
}
|
|
printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model);
|
|
printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev);
|
|
printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no);
|
|
printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512);
|
|
printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
|
|
printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
|
|
printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
|
|
printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
|
|
printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
|
|
printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO);
|
|
printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA);
|
|
printk(KERN_INFO "ide-tape: Single Word DMA supported modes: ");
|
|
for (i=0,mask=1;i<8;i++,mask=mask << 1) {
|
|
if (id->dma_1word & mask)
|
|
printk("%d ",i);
|
|
if (id->dma_1word & (mask << 8))
|
|
printk("(active) ");
|
|
}
|
|
printk("\n");
|
|
printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: ");
|
|
for (i=0,mask=1;i<8;i++,mask=mask << 1) {
|
|
if (id->dma_mword & mask)
|
|
printk("%d ",i);
|
|
if (id->dma_mword & (mask << 8))
|
|
printk("(active) ");
|
|
}
|
|
printk("\n");
|
|
if (id->field_valid & 0x0002) {
|
|
printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",
|
|
id->eide_pio_modes & 1 ? "Mode 3":"None");
|
|
printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: ");
|
|
if (id->eide_dma_min == 0)
|
|
printk("Not supported\n");
|
|
else
|
|
printk("%d ns\n",id->eide_dma_min);
|
|
|
|
printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: ");
|
|
if (id->eide_dma_time == 0)
|
|
printk("Not supported\n");
|
|
else
|
|
printk("%d ns\n",id->eide_dma_time);
|
|
|
|
printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: ");
|
|
if (id->eide_pio == 0)
|
|
printk("Not supported\n");
|
|
else
|
|
printk("%d ns\n",id->eide_pio);
|
|
|
|
printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: ");
|
|
if (id->eide_pio_iordy == 0)
|
|
printk("Not supported\n");
|
|
else
|
|
printk("%d ns\n",id->eide_pio_iordy);
|
|
|
|
} else
|
|
printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n");
|
|
#endif /* IDETAPE_DEBUG_INFO */
|
|
|
|
/* Check that we can support this device */
|
|
|
|
if (gcw.protocol !=2 )
|
|
printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n");
|
|
else if (gcw.device_type != 1)
|
|
printk(KERN_ERR "ide-tape: Device type is not set to tape\n");
|
|
else if (!gcw.removable)
|
|
printk(KERN_ERR "ide-tape: The removable flag is not set\n");
|
|
else if (gcw.packet_size != 0) {
|
|
printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n");
|
|
if (gcw.packet_size == 1)
|
|
printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n");
|
|
} else
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Use INQUIRY to get the firmware revision
|
|
*/
|
|
static void idetape_get_inquiry_results (ide_drive_t *drive)
|
|
{
|
|
char *r;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
idetape_inquiry_result_t *inquiry;
|
|
|
|
idetape_create_inquiry_cmd(&pc);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name);
|
|
return;
|
|
}
|
|
inquiry = (idetape_inquiry_result_t *) pc.buffer;
|
|
memcpy(tape->vendor_id, inquiry->vendor_id, 8);
|
|
memcpy(tape->product_id, inquiry->product_id, 16);
|
|
memcpy(tape->firmware_revision, inquiry->revision_level, 4);
|
|
ide_fixstring(tape->vendor_id, 10, 0);
|
|
ide_fixstring(tape->product_id, 18, 0);
|
|
ide_fixstring(tape->firmware_revision, 6, 0);
|
|
r = tape->firmware_revision;
|
|
if (*(r + 1) == '.')
|
|
tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0';
|
|
printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision);
|
|
}
|
|
|
|
/*
|
|
* idetape_get_mode_sense_results asks the tape about its various
|
|
* parameters. In particular, we will adjust our data transfer buffer
|
|
* size to the recommended value as returned by the tape.
|
|
*/
|
|
static void idetape_get_mode_sense_results (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
idetape_mode_parameter_header_t *header;
|
|
idetape_capabilities_page_t *capabilities;
|
|
|
|
idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
|
|
tape->tape_block_size = 512;
|
|
tape->capabilities.ctl = 52;
|
|
tape->capabilities.speed = 450;
|
|
tape->capabilities.buffer_size = 6 * 52;
|
|
return;
|
|
}
|
|
header = (idetape_mode_parameter_header_t *) pc.buffer;
|
|
capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl);
|
|
|
|
capabilities->max_speed = ntohs(capabilities->max_speed);
|
|
capabilities->ctl = ntohs(capabilities->ctl);
|
|
capabilities->speed = ntohs(capabilities->speed);
|
|
capabilities->buffer_size = ntohs(capabilities->buffer_size);
|
|
|
|
if (!capabilities->speed) {
|
|
printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name);
|
|
capabilities->speed = 650;
|
|
}
|
|
if (!capabilities->max_speed) {
|
|
printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name);
|
|
capabilities->max_speed = 650;
|
|
}
|
|
|
|
tape->capabilities = *capabilities; /* Save us a copy */
|
|
if (capabilities->blk512)
|
|
tape->tape_block_size = 512;
|
|
else if (capabilities->blk1024)
|
|
tape->tape_block_size = 1024;
|
|
|
|
#if IDETAPE_DEBUG_INFO
|
|
printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n");
|
|
printk(KERN_INFO "ide-tape: Mode Parameter Header:\n");
|
|
printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length);
|
|
printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type);
|
|
printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp);
|
|
printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl);
|
|
|
|
printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n");
|
|
printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code);
|
|
printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length);
|
|
printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No");
|
|
printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed);
|
|
printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl);
|
|
printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed);
|
|
printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512);
|
|
#endif /* IDETAPE_DEBUG_INFO */
|
|
}
|
|
|
|
/*
|
|
* ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
|
|
* and if it succeeds sets the tape block size with the reported value
|
|
*/
|
|
static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive)
|
|
{
|
|
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
idetape_mode_parameter_header_t *header;
|
|
idetape_parameter_block_descriptor_t *block_descrp;
|
|
|
|
idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
|
|
if (tape->tape_block_size == 0) {
|
|
printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n");
|
|
tape->tape_block_size = 32768;
|
|
}
|
|
return;
|
|
}
|
|
header = (idetape_mode_parameter_header_t *) pc.buffer;
|
|
block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t));
|
|
tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2];
|
|
tape->drv_write_prot = (header->dsp & 0x80) >> 7;
|
|
|
|
#if IDETAPE_DEBUG_INFO
|
|
printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size);
|
|
#endif /* IDETAPE_DEBUG_INFO */
|
|
}
|
|
static void idetape_add_settings (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
/*
|
|
* drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
|
|
*/
|
|
ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL);
|
|
ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
|
|
ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
|
|
ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
|
|
ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
|
|
ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
|
|
ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL);
|
|
ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
|
|
ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
|
|
ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
|
|
ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
|
|
ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL);
|
|
ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
|
|
ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL);
|
|
}
|
|
|
|
/*
|
|
* ide_setup is called to:
|
|
*
|
|
* 1. Initialize our various state variables.
|
|
* 2. Ask the tape for its capabilities.
|
|
* 3. Allocate a buffer which will be used for data
|
|
* transfer. The buffer size is chosen based on
|
|
* the recommendation which we received in step (2).
|
|
*
|
|
* Note that at this point ide.c already assigned us an irq, so that
|
|
* we can queue requests here and wait for their completion.
|
|
*/
|
|
static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
|
|
{
|
|
unsigned long t1, tmid, tn, t;
|
|
int speed;
|
|
struct idetape_id_gcw gcw;
|
|
int stage_size;
|
|
struct sysinfo si;
|
|
|
|
spin_lock_init(&tape->spinlock);
|
|
drive->dsc_overlap = 1;
|
|
#ifdef CONFIG_BLK_DEV_IDEPCI
|
|
if (HWIF(drive)->pci_dev != NULL) {
|
|
/*
|
|
* These two ide-pci host adapters appear to need DSC overlap disabled.
|
|
* This probably needs further analysis.
|
|
*/
|
|
if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) ||
|
|
(HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) {
|
|
printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name);
|
|
drive->dsc_overlap = 0;
|
|
}
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_IDEPCI */
|
|
/* Seagate Travan drives do not support DSC overlap. */
|
|
if (strstr(drive->id->model, "Seagate STT3401"))
|
|
drive->dsc_overlap = 0;
|
|
tape->minor = minor;
|
|
tape->name[0] = 'h';
|
|
tape->name[1] = 't';
|
|
tape->name[2] = '0' + minor;
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
tape->pc = tape->pc_stack;
|
|
tape->max_insert_speed = 10000;
|
|
tape->speed_control = 1;
|
|
*((unsigned short *) &gcw) = drive->id->config;
|
|
if (gcw.drq_type == 1)
|
|
set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
|
|
|
|
tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
|
|
|
|
idetape_get_inquiry_results(drive);
|
|
idetape_get_mode_sense_results(drive);
|
|
idetape_get_blocksize_from_block_descriptor(drive);
|
|
tape->user_bs_factor = 1;
|
|
tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
|
|
while (tape->stage_size > 0xffff) {
|
|
printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
|
|
tape->capabilities.ctl /= 2;
|
|
tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
|
|
}
|
|
stage_size = tape->stage_size;
|
|
tape->pages_per_stage = stage_size / PAGE_SIZE;
|
|
if (stage_size % PAGE_SIZE) {
|
|
tape->pages_per_stage++;
|
|
tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
|
|
}
|
|
|
|
/*
|
|
* Select the "best" DSC read/write polling frequency
|
|
* and pipeline size.
|
|
*/
|
|
speed = max(tape->capabilities.speed, tape->capabilities.max_speed);
|
|
|
|
tape->max_stages = speed * 1000 * 10 / tape->stage_size;
|
|
|
|
/*
|
|
* Limit memory use for pipeline to 10% of physical memory
|
|
*/
|
|
si_meminfo(&si);
|
|
if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
|
|
tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
|
|
tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
|
|
tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
|
|
tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
|
|
if (tape->max_stages == 0)
|
|
tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
|
|
|
|
t1 = (tape->stage_size * HZ) / (speed * 1000);
|
|
tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125);
|
|
tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
|
|
|
|
if (tape->max_stages)
|
|
t = tn;
|
|
else
|
|
t = t1;
|
|
|
|
/*
|
|
* Ensure that the number we got makes sense; limit
|
|
* it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
|
|
*/
|
|
tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
|
|
printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
|
|
"%dkB pipeline, %lums tDSC%s\n",
|
|
drive->name, tape->name, tape->capabilities.speed,
|
|
(tape->capabilities.buffer_size * 512) / tape->stage_size,
|
|
tape->stage_size / 1024,
|
|
tape->max_stages * tape->stage_size / 1024,
|
|
tape->best_dsc_rw_frequency * 1000 / HZ,
|
|
drive->using_dma ? ", DMA":"");
|
|
|
|
idetape_add_settings(drive);
|
|
}
|
|
|
|
static int ide_tape_remove(struct device *dev)
|
|
{
|
|
ide_drive_t *drive = to_ide_device(dev);
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
ide_unregister_subdriver(drive, tape->driver);
|
|
|
|
ide_unregister_region(tape->disk);
|
|
|
|
ide_tape_put(tape);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ide_tape_release(struct kref *kref)
|
|
{
|
|
struct ide_tape_obj *tape = to_ide_tape(kref);
|
|
ide_drive_t *drive = tape->drive;
|
|
struct gendisk *g = tape->disk;
|
|
|
|
BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
|
|
|
|
drive->dsc_overlap = 0;
|
|
drive->driver_data = NULL;
|
|
class_device_destroy(idetape_sysfs_class,
|
|
MKDEV(IDETAPE_MAJOR, tape->minor));
|
|
class_device_destroy(idetape_sysfs_class,
|
|
MKDEV(IDETAPE_MAJOR, tape->minor + 128));
|
|
devfs_remove("%s/mt", drive->devfs_name);
|
|
devfs_remove("%s/mtn", drive->devfs_name);
|
|
devfs_unregister_tape(g->number);
|
|
idetape_devs[tape->minor] = NULL;
|
|
g->private_data = NULL;
|
|
put_disk(g);
|
|
kfree(tape);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static int proc_idetape_read_name
|
|
(char *page, char **start, off_t off, int count, int *eof, void *data)
|
|
{
|
|
ide_drive_t *drive = (ide_drive_t *) data;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
char *out = page;
|
|
int len;
|
|
|
|
len = sprintf(out, "%s\n", tape->name);
|
|
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
|
|
}
|
|
|
|
static ide_proc_entry_t idetape_proc[] = {
|
|
{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
|
|
{ "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
|
|
{ NULL, 0, NULL, NULL }
|
|
};
|
|
|
|
#else
|
|
|
|
#define idetape_proc NULL
|
|
|
|
#endif
|
|
|
|
static int ide_tape_probe(struct device *);
|
|
|
|
static ide_driver_t idetape_driver = {
|
|
.owner = THIS_MODULE,
|
|
.gen_driver = {
|
|
.name = "ide-tape",
|
|
.bus = &ide_bus_type,
|
|
.probe = ide_tape_probe,
|
|
.remove = ide_tape_remove,
|
|
},
|
|
.version = IDETAPE_VERSION,
|
|
.media = ide_tape,
|
|
.supports_dsc_overlap = 1,
|
|
.do_request = idetape_do_request,
|
|
.end_request = idetape_end_request,
|
|
.error = __ide_error,
|
|
.abort = __ide_abort,
|
|
.proc = idetape_proc,
|
|
};
|
|
|
|
/*
|
|
* Our character device supporting functions, passed to register_chrdev.
|
|
*/
|
|
static struct file_operations idetape_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = idetape_chrdev_read,
|
|
.write = idetape_chrdev_write,
|
|
.ioctl = idetape_chrdev_ioctl,
|
|
.open = idetape_chrdev_open,
|
|
.release = idetape_chrdev_release,
|
|
};
|
|
|
|
static int idetape_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct ide_tape_obj *tape;
|
|
ide_drive_t *drive;
|
|
|
|
if (!(tape = ide_tape_get(disk)))
|
|
return -ENXIO;
|
|
|
|
drive = tape->drive;
|
|
|
|
drive->usage++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int idetape_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct ide_tape_obj *tape = ide_tape_g(disk);
|
|
ide_drive_t *drive = tape->drive;
|
|
|
|
drive->usage--;
|
|
|
|
ide_tape_put(tape);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int idetape_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct block_device *bdev = inode->i_bdev;
|
|
struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
|
|
ide_drive_t *drive = tape->drive;
|
|
int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
|
|
if (err == -EINVAL)
|
|
err = idetape_blkdev_ioctl(drive, cmd, arg);
|
|
return err;
|
|
}
|
|
|
|
static struct block_device_operations idetape_block_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = idetape_open,
|
|
.release = idetape_release,
|
|
.ioctl = idetape_ioctl,
|
|
};
|
|
|
|
static int ide_tape_probe(struct device *dev)
|
|
{
|
|
ide_drive_t *drive = to_ide_device(dev);
|
|
idetape_tape_t *tape;
|
|
struct gendisk *g;
|
|
int minor;
|
|
|
|
if (!strstr("ide-tape", drive->driver_req))
|
|
goto failed;
|
|
if (!drive->present)
|
|
goto failed;
|
|
if (drive->media != ide_tape)
|
|
goto failed;
|
|
if (!idetape_identify_device (drive)) {
|
|
printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
|
|
goto failed;
|
|
}
|
|
if (drive->scsi) {
|
|
printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
|
|
goto failed;
|
|
}
|
|
if (strstr(drive->id->model, "OnStream DI-")) {
|
|
printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
|
|
printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
|
|
}
|
|
tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL);
|
|
if (tape == NULL) {
|
|
printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
|
|
goto failed;
|
|
}
|
|
|
|
g = alloc_disk(1 << PARTN_BITS);
|
|
if (!g)
|
|
goto out_free_tape;
|
|
|
|
ide_init_disk(g, drive);
|
|
|
|
ide_register_subdriver(drive, &idetape_driver);
|
|
|
|
memset(tape, 0, sizeof(*tape));
|
|
|
|
kref_init(&tape->kref);
|
|
|
|
tape->drive = drive;
|
|
tape->driver = &idetape_driver;
|
|
tape->disk = g;
|
|
|
|
g->private_data = &tape->driver;
|
|
|
|
drive->driver_data = tape;
|
|
|
|
down(&idetape_ref_sem);
|
|
for (minor = 0; idetape_devs[minor]; minor++)
|
|
;
|
|
idetape_devs[minor] = tape;
|
|
up(&idetape_ref_sem);
|
|
|
|
idetape_setup(drive, tape, minor);
|
|
|
|
class_device_create(idetape_sysfs_class, NULL,
|
|
MKDEV(IDETAPE_MAJOR, minor), dev, "%s", tape->name);
|
|
class_device_create(idetape_sysfs_class, NULL,
|
|
MKDEV(IDETAPE_MAJOR, minor + 128), dev, "n%s", tape->name);
|
|
|
|
devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor),
|
|
S_IFCHR | S_IRUGO | S_IWUGO,
|
|
"%s/mt", drive->devfs_name);
|
|
devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor + 128),
|
|
S_IFCHR | S_IRUGO | S_IWUGO,
|
|
"%s/mtn", drive->devfs_name);
|
|
|
|
g->number = devfs_register_tape(drive->devfs_name);
|
|
g->fops = &idetape_block_ops;
|
|
ide_register_region(g);
|
|
|
|
return 0;
|
|
|
|
out_free_tape:
|
|
kfree(tape);
|
|
failed:
|
|
return -ENODEV;
|
|
}
|
|
|
|
MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static void __exit idetape_exit (void)
|
|
{
|
|
driver_unregister(&idetape_driver.gen_driver);
|
|
class_destroy(idetape_sysfs_class);
|
|
unregister_chrdev(IDETAPE_MAJOR, "ht");
|
|
}
|
|
|
|
/*
|
|
* idetape_init will register the driver for each tape.
|
|
*/
|
|
static int idetape_init (void)
|
|
{
|
|
int error = 1;
|
|
idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
|
|
if (IS_ERR(idetape_sysfs_class)) {
|
|
idetape_sysfs_class = NULL;
|
|
printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
|
|
error = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
|
|
printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
|
|
error = -EBUSY;
|
|
goto out_free_class;
|
|
}
|
|
|
|
error = driver_register(&idetape_driver.gen_driver);
|
|
if (error)
|
|
goto out_free_driver;
|
|
|
|
return 0;
|
|
|
|
out_free_driver:
|
|
driver_unregister(&idetape_driver.gen_driver);
|
|
out_free_class:
|
|
class_destroy(idetape_sysfs_class);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
module_init(idetape_init);
|
|
module_exit(idetape_exit);
|
|
MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
|