ipmi: Update documentation
The documentation has some information that was old and needed some things added that are new. Signed-off-by: Corey Minyard <cminyard@mvista.com>
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Corey Minyard
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@ -111,6 +111,8 @@ ipmi_ssif - A driver for accessing BMCs on the SMBus. It uses the
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I2C kernel driver's SMBus interfaces to send and receive IPMI messages
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over the SMBus.
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ipmi_powernv - A driver for access BMCs on POWERNV systems.
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ipmi_watchdog - IPMI requires systems to have a very capable watchdog
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timer. This driver implements the standard Linux watchdog timer
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interface on top of the IPMI message handler.
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@ -118,17 +120,15 @@ interface on top of the IPMI message handler.
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ipmi_poweroff - Some systems support the ability to be turned off via
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IPMI commands.
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These are all individually selectable via configuration options.
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bt-bmc - This is not part of the main driver, but instead a driver for
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accessing a BMC-side interface of a BT interface. It is used on BMCs
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running Linux to provide an interface to the host.
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Note that the KCS-only interface has been removed. The af_ipmi driver
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is no longer supported and has been removed because it was impossible
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to do 32 bit emulation on 64-bit kernels with it.
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These are all individually selectable via configuration options.
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Much documentation for the interface is in the include files. The
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IPMI include files are:
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net/af_ipmi.h - Contains the socket interface.
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linux/ipmi.h - Contains the user interface and IOCTL interface for IPMI.
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linux/ipmi_smi.h - Contains the interface for system management interfaces
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@ -245,6 +245,16 @@ addressed (because some boards actually have multiple BMCs on them)
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and the user should not have to care what type of SMI is below them.
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Watching For Interfaces
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When your code comes up, the IPMI driver may or may not have detected
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if IPMI devices exist. So you might have to defer your setup until
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the device is detected, or you might be able to do it immediately.
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To handle this, and to allow for discovery, you register an SMI
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watcher with ipmi_smi_watcher_register() to iterate over interfaces
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and tell you when they come and go.
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Creating the User
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To user the message handler, you must first create a user using
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@ -263,7 +273,7 @@ closing the device automatically destroys the user.
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Messaging
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To send a message from kernel-land, the ipmi_request() call does
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To send a message from kernel-land, the ipmi_request_settime() call does
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pretty much all message handling. Most of the parameter are
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self-explanatory. However, it takes a "msgid" parameter. This is NOT
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the sequence number of messages. It is simply a long value that is
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@ -352,11 +362,12 @@ that for more details.
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The SI Driver
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-------------
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The SI driver allows up to 4 KCS or SMIC interfaces to be configured
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in the system. By default, scan the ACPI tables for interfaces, and
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if it doesn't find any the driver will attempt to register one KCS
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interface at the spec-specified I/O port 0xca2 without interrupts.
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You can change this at module load time (for a module) with:
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The SI driver allows KCS, BT, and SMIC interfaces to be configured
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in the system. It discovers interfaces through a host of different
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methods, depending on the system.
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You can specify up to four interfaces on the module load line and
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control some module parameters:
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modprobe ipmi_si.o type=<type1>,<type2>....
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ports=<port1>,<port2>... addrs=<addr1>,<addr2>...
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@ -367,7 +378,7 @@ You can change this at module load time (for a module) with:
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force_kipmid=<enable1>,<enable2>,...
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kipmid_max_busy_us=<ustime1>,<ustime2>,...
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unload_when_empty=[0|1]
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trydefaults=[0|1] trydmi=[0|1] tryacpi=[0|1]
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trydmi=[0|1] tryacpi=[0|1]
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tryplatform=[0|1] trypci=[0|1]
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Each of these except try... items is a list, the first item for the
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@ -386,10 +397,6 @@ use the I/O port given as the device address.
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If you specify irqs as non-zero for an interface, the driver will
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attempt to use the given interrupt for the device.
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trydefaults sets whether the standard IPMI interface at 0xca2 and
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any interfaces specified by ACPE are tried. By default, the driver
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tries it, set this value to zero to turn this off.
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The other try... items disable discovery by their corresponding
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names. These are all enabled by default, set them to zero to disable
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them. The tryplatform disables openfirmware.
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@ -434,7 +441,7 @@ kernel command line as:
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ipmi_si.type=<type1>,<type2>...
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ipmi_si.ports=<port1>,<port2>... ipmi_si.addrs=<addr1>,<addr2>...
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ipmi_si.irqs=<irq1>,<irq2>... ipmi_si.trydefaults=[0|1]
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ipmi_si.irqs=<irq1>,<irq2>...
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ipmi_si.regspacings=<sp1>,<sp2>,...
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ipmi_si.regsizes=<size1>,<size2>,...
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ipmi_si.regshifts=<shift1>,<shift2>,...
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@ -444,11 +451,6 @@ kernel command line as:
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It works the same as the module parameters of the same names.
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By default, the driver will attempt to detect any device specified by
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ACPI, and if none of those then a KCS device at the spec-specified
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0xca2. If you want to turn this off, set the "trydefaults" option to
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false.
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If your IPMI interface does not support interrupts and is a KCS or
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SMIC interface, the IPMI driver will start a kernel thread for the
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interface to help speed things up. This is a low-priority kernel
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@ -500,7 +502,8 @@ at module load time (for a module) with:
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addr=<i2caddr1>[,<i2caddr2>[,...]]
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adapter=<adapter1>[,<adapter2>[...]]
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dbg=<flags1>,<flags2>...
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slave_addrs=<addr1>,<addr2>,...
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slave_addrs=<addr1>,<addr2>,...
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tryacpi=[0|1] trydmi=[0|1]
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[dbg_probe=1]
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The addresses are normal I2C addresses. The adapter is the string
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@ -513,6 +516,9 @@ spaces in kernel parameters.
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The debug flags are bit flags for each BMC found, they are:
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IPMI messages: 1, driver state: 2, timing: 4, I2C probe: 8
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The tryxxx parameters can be used to disable detecting interfaces
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from various sources.
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Setting dbg_probe to 1 will enable debugging of the probing and
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detection process for BMCs on the SMBusses.
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@ -535,7 +541,8 @@ kernel command line as:
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ipmi_ssif.adapter=<adapter1>[,<adapter2>[...]]
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ipmi_ssif.dbg=<flags1>[,<flags2>[...]]
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ipmi_ssif.dbg_probe=1
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ipmi_ssif.slave_addrs=<addr1>[,<addr2>[...]]
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ipmi_ssif.slave_addrs=<addr1>[,<addr2>[...]]
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ipmi_ssif.tryacpi=[0|1] ipmi_ssif.trydmi=[0|1]
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These are the same options as on the module command line.
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