2005-04-17 06:20:36 +08:00
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#ifndef _SCSI_SCSI_CMND_H
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#define _SCSI_SCSI_CMND_H
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#include <linux/dma-mapping.h>
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2007-12-13 19:50:53 +08:00
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#include <linux/blkdev.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/list.h>
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#include <linux/types.h>
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2005-10-31 07:03:48 +08:00
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#include <linux/timer.h>
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2007-10-16 17:08:49 +08:00
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#include <linux/scatterlist.h>
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2005-04-17 06:20:36 +08:00
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2006-11-16 18:24:10 +08:00
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struct Scsi_Host;
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2005-04-17 06:20:36 +08:00
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struct scsi_device;
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2008-04-30 16:19:47 +08:00
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/*
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* MAX_COMMAND_SIZE is:
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* The longest fixed-length SCSI CDB as per the SCSI standard.
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* fixed-length means: commands that their size can be determined
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* by their opcode and the CDB does not carry a length specifier, (unlike
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* the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
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* true and the SCSI standard also defines extended commands and
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* vendor specific commands that can be bigger than 16 bytes. The kernel
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* will support these using the same infrastructure used for VARLEN CDB's.
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* So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
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* supports without specifying a cmd_len by ULD's
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*/
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#define MAX_COMMAND_SIZE 16
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#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
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# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
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#endif
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2007-12-13 19:47:40 +08:00
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struct scsi_data_buffer {
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struct sg_table table;
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unsigned length;
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int resid;
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};
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2005-04-17 06:20:36 +08:00
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/* embedded in scsi_cmnd */
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struct scsi_pointer {
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char *ptr; /* data pointer */
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int this_residual; /* left in this buffer */
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struct scatterlist *buffer; /* which buffer */
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int buffers_residual; /* how many buffers left */
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dma_addr_t dma_handle;
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volatile int Status;
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volatile int Message;
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volatile int have_data_in;
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volatile int sent_command;
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volatile int phase;
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};
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struct scsi_cmnd {
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struct scsi_device *device;
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struct list_head list; /* scsi_cmnd participates in queue lists */
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struct list_head eh_entry; /* entry for the host eh_cmd_q */
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int eh_eflags; /* Used by error handlr */
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/*
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2005-04-04 03:59:11 +08:00
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* A SCSI Command is assigned a nonzero serial_number before passed
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* to the driver's queue command function. The serial_number is
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* cleared when scsi_done is entered indicating that the command
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2007-09-19 09:54:43 +08:00
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* has been completed. It is a bug for LLDDs to use this number
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* for purposes other than printk (and even that is only useful
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* for debugging).
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2005-04-17 06:20:36 +08:00
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*/
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unsigned long serial_number;
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2007-09-19 09:54:43 +08:00
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2005-08-06 10:45:40 +08:00
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/*
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* This is set to jiffies as it was when the command was first
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* allocated. It is used to time how long the command has
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* been outstanding
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*/
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unsigned long jiffies_at_alloc;
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2005-04-17 06:20:36 +08:00
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int retries;
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int allowed;
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int timeout_per_command;
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2008-07-17 16:28:31 +08:00
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unsigned char prot_op;
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unsigned char prot_type;
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2008-04-30 16:27:26 +08:00
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unsigned short cmd_len;
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2005-04-17 06:20:36 +08:00
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enum dma_data_direction sc_data_direction;
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/* These elements define the operation we are about to perform */
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2008-04-30 16:19:47 +08:00
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unsigned char *cmnd;
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2005-04-17 06:20:36 +08:00
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struct timer_list eh_timeout; /* Used to time out the command. */
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/* These elements define the operation we ultimately want to perform */
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2007-12-13 19:47:40 +08:00
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struct scsi_data_buffer sdb;
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2008-07-18 05:08:48 +08:00
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struct scsi_data_buffer *prot_sdb;
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2005-04-17 06:20:36 +08:00
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unsigned underflow; /* Return error if less than
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this amount is transferred */
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unsigned transfersize; /* How much we are guaranteed to
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transfer with each SCSI transfer
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(ie, between disconnect /
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reconnects. Probably == sector
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size */
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struct request *request; /* The command we are
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working on */
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#define SCSI_SENSE_BUFFERSIZE 96
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2008-01-16 12:32:17 +08:00
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unsigned char *sense_buffer;
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2006-01-18 02:54:24 +08:00
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/* obtained by REQUEST SENSE when
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* CHECK CONDITION is received on original
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* command (auto-sense) */
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2005-04-17 06:20:36 +08:00
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/* Low-level done function - can be used by low-level driver to point
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* to completion function. Not used by mid/upper level code. */
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void (*scsi_done) (struct scsi_cmnd *);
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/*
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* The following fields can be written to by the host specific code.
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* Everything else should be left alone.
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*/
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struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
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unsigned char *host_scribble; /* The host adapter is allowed to
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2006-01-18 02:54:24 +08:00
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* call scsi_malloc and get some memory
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* and hang it here. The host adapter
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* is also expected to call scsi_free
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* to release this memory. (The memory
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* obtained by scsi_malloc is guaranteed
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* to be at an address < 16Mb). */
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2005-04-17 06:20:36 +08:00
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int result; /* Status code from lower level driver */
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unsigned char tag; /* SCSI-II queued command tag */
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};
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2005-10-21 15:22:08 +08:00
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extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
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2006-11-16 18:24:10 +08:00
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extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t);
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2005-04-17 06:20:36 +08:00
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extern void scsi_put_command(struct scsi_cmnd *);
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2006-11-16 18:24:10 +08:00
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extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *,
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struct device *);
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2005-04-17 06:20:36 +08:00
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extern void scsi_finish_command(struct scsi_cmnd *cmd);
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2006-05-15 19:57:18 +08:00
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extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd);
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2005-04-17 06:20:36 +08:00
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[SCSI] dc395x: dynamically map scatter-gather for PIO
The current dc395x driver uses PIO to transfer up to 4 bytes which do not
get transferred by DMA (under unclear circumstances). For this the driver
uses page_address() which is broken on highmem. Apart from this the
actual calculation of the virtual address is wrong (even without highmem).
So, e.g., for reading it reads bytes from the driver to a wrong address
and returns wrong data, I guess, for writing it would just output random
data to the device.
The proper fix, as suggested by many, is to dynamically map data using
kmap_atomic(page, KM_BIO_SRC_IRQ) / kunmap_atomic(virt). The reason why it
has not been done until now, although I've done some preliminary patches
more than a year ago was that nobody interested in fixing this problem was
able to reliably reproduce it. Now it changed - with the help from
Sebastian Frei (CC'ed) I was able to trigger the PIO path. Thus, I was
also able to test and debug it.
There are 4 cases when PIO is used in dc395x - data-in / -out with and
without scatter-gather. I was able to reproduce and test only data-in with
and without SG. So, the data-out path is still untested, but it is also
somewhat simpler than the data-in. Fredrik Roubert (also CC'ed) also had
PIO triggering on his system, and in his case it was data-out without SG.
It would be great if he could test the attached patch on his system, but
even if he cannot, I would still request to apply the patch and just wait
if anybody cries...
Implementation: I put 2 new functions in scsi_lib.c and their declarations
in scsi_cmnd.h. I exported them without _GPL, although, I don't feel
strongly about that - not many drivers are likely to use them. But there
is at least one more - I want to use them in tmscsim.c. Whether these are
the right files for the functions and their declarations - not sure
either. Actually, they are not scsi-specific, so, might go somewhere
around other scattergather magic? They are not platform specific either,
and most SG functions are defined under arch/*/... As these issues were
discussed previously there were some more routines suggested to manipulate
scattergather buffers, I think, some of them were needed around
crypto code... So, might be a common place reasonable, like
lib/scattergather.c? I am open here.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-04-03 03:57:43 +08:00
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extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
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size_t *offset, size_t *len);
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extern void scsi_kunmap_atomic_sg(void *virt);
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2007-12-14 08:14:27 +08:00
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extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
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extern void scsi_release_buffers(struct scsi_cmnd *cmd);
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2006-11-16 18:24:10 +08:00
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2007-05-26 13:04:03 +08:00
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extern int scsi_dma_map(struct scsi_cmnd *cmd);
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extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
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2008-03-14 00:19:36 +08:00
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struct scsi_cmnd *scsi_allocate_command(gfp_t gfp_mask);
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void scsi_free_command(gfp_t gfp_mask, struct scsi_cmnd *cmd);
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2007-12-13 19:47:40 +08:00
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static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
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{
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return cmd->sdb.table.nents;
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}
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static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
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{
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return cmd->sdb.table.sgl;
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}
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static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
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{
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return cmd->sdb.length;
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}
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2007-05-26 13:04:03 +08:00
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static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
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{
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2007-12-13 19:47:40 +08:00
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cmd->sdb.resid = resid;
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2007-05-26 13:04:03 +08:00
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}
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static inline int scsi_get_resid(struct scsi_cmnd *cmd)
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{
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2007-12-13 19:47:40 +08:00
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return cmd->sdb.resid;
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2007-05-26 13:04:03 +08:00
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}
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#define scsi_for_each_sg(cmd, sg, nseg, __i) \
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2007-10-16 17:08:49 +08:00
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for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
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2007-05-26 13:04:03 +08:00
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2007-12-13 19:50:53 +08:00
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static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
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{
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return blk_bidi_rq(cmd->request) &&
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(cmd->request->next_rq->special != NULL);
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}
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static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
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{
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return scsi_bidi_cmnd(cmd) ?
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cmd->request->next_rq->special : &cmd->sdb;
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}
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static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
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{
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return &cmd->sdb;
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}
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[SCSI] scsi: add wrapper functions for sg buffer copy helper functions
LLDs need to copies data between the SG table in struct scsi_cmnd and
liner buffer. So they use the helper functions like
sg_copy_from_buffer(scsi_sglist(sc), scsi_sg_count(sc), buf, buflen)
sg_copy_to_buffer(scsi_sglist(sc), scsi_sg_count(sc), buf, buflen)
This patch just adds wrapper functions:
scsi_sg_copy_from_buffer(sc, buf, buflen)
scsi_sg_copy_to_buffer(sc, buf, buflen)
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-03-09 12:44:29 +08:00
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static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
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void *buf, int buflen)
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{
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return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
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buf, buflen);
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}
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static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
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void *buf, int buflen)
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{
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return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
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buf, buflen);
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}
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2008-07-17 16:28:31 +08:00
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/*
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* The operations below are hints that tell the controller driver how
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* to handle I/Os with DIF or similar types of protection information.
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*/
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enum scsi_prot_operations {
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/* Normal I/O */
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SCSI_PROT_NORMAL = 0,
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/* OS-HBA: Protected, HBA-Target: Unprotected */
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SCSI_PROT_READ_INSERT,
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SCSI_PROT_WRITE_STRIP,
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/* OS-HBA: Unprotected, HBA-Target: Protected */
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SCSI_PROT_READ_STRIP,
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SCSI_PROT_WRITE_INSERT,
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/* OS-HBA: Protected, HBA-Target: Protected */
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SCSI_PROT_READ_PASS,
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SCSI_PROT_WRITE_PASS,
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/* OS-HBA: Protected, HBA-Target: Protected, checksum conversion */
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SCSI_PROT_READ_CONVERT,
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SCSI_PROT_WRITE_CONVERT,
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};
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static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
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{
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scmd->prot_op = op;
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}
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static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
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{
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return scmd->prot_op;
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}
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/*
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* The controller usually does not know anything about the target it
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* is communicating with. However, when DIX is enabled the controller
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* must be know target type so it can verify the protection
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* information passed along with the I/O.
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*/
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enum scsi_prot_target_type {
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SCSI_PROT_DIF_TYPE0 = 0,
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SCSI_PROT_DIF_TYPE1,
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SCSI_PROT_DIF_TYPE2,
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SCSI_PROT_DIF_TYPE3,
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};
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static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
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{
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scmd->prot_type = type;
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}
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static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
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{
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return scmd->prot_type;
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}
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static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
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{
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return scmd->request->sector;
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}
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2008-07-18 05:08:48 +08:00
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static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
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{
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return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
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}
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static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
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{
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return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
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}
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static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
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{
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return cmd->prot_sdb;
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}
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#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
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for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
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2005-04-17 06:20:36 +08:00
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#endif /* _SCSI_SCSI_CMND_H */
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