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- Linux Kernel 2.6 series
- SCSI mid_level - lower_level driver interface
- =============================================
-
-Introduction
-============
-This document outlines the interface between the Linux SCSI mid level and
-SCSI lower level drivers. Lower level drivers (LLDs) are variously called
-host bus adapter (HBA) drivers and host drivers (HD). A "host" in this
-context is a bridge between a computer IO bus (e.g. PCI or ISA) and a
-single SCSI initiator port on a SCSI transport. An "initiator" port
-(SCSI terminology, see SAM-3 at http://www.t10.org) sends SCSI commands
-to "target" SCSI ports (e.g. disks). There can be many LLDs in a running
-system, but only one per hardware type. Most LLDs can control one or more
-SCSI HBAs. Some HBAs contain multiple hosts.
-
-In some cases the SCSI transport is an external bus that already has
-its own subsystem in Linux (e.g. USB and ieee1394). In such cases the
-SCSI subsystem LLD is a software bridge to the other driver subsystem.
-Examples are the usb-storage driver (found in the drivers/usb/storage
-directory) and the ieee1394/sbp2 driver (found in the drivers/ieee1394
-directory).
-
-For example, the aic7xxx LLD controls Adaptec SCSI parallel interface
-(SPI) controllers based on that company's 7xxx chip series. The aic7xxx
-LLD can be built into the kernel or loaded as a module. There can only be
-one aic7xxx LLD running in a Linux system but it may be controlling many
-HBAs. These HBAs might be either on PCI daughter-boards or built into
-the motherboard (or both). Some aic7xxx based HBAs are dual controllers
-and thus represent two hosts. Like most modern HBAs, each aic7xxx host
-has its own PCI device address. [The one-to-one correspondence between
-a SCSI host and a PCI device is common but not required (e.g. with
-ISA adapters).]
-
-The SCSI mid level isolates an LLD from other layers such as the SCSI
-upper layer drivers and the block layer.
-
-This version of the document roughly matches linux kernel version 2.6.8 .
-
-Documentation
-=============
-There is a SCSI documentation directory within the kernel source tree,
-typically Documentation/scsi . Most documents are in plain
-(i.e. ASCII) text. This file is named scsi_mid_low_api.txt and can be
-found in that directory. A more recent copy of this document may be found
-at http://web.archive.org/web/20070107183357rn_1/sg.torque.net/scsi/.
-Many LLDs are documented there (e.g. aic7xxx.txt). The SCSI mid-level is
-briefly described in scsi.txt which contains a url to a document
-describing the SCSI subsystem in the lk 2.4 series. Two upper level
-drivers have documents in that directory: st.txt (SCSI tape driver) and
-scsi-generic.txt (for the sg driver).
-
-Some documentation (or urls) for LLDs may be found in the C source code
-or in the same directory as the C source code. For example to find a url
-about the USB mass storage driver see the
-/usr/src/linux/drivers/usb/storage directory.
-
-Driver structure
-================
-Traditionally an LLD for the SCSI subsystem has been at least two files in
-the drivers/scsi directory. For example, a driver called "xyz" has a header
-file "xyz.h" and a source file "xyz.c". [Actually there is no good reason
-why this couldn't all be in one file; the header file is superfluous.] Some
-drivers that have been ported to several operating systems have more than
-two files. For example the aic7xxx driver has separate files for generic
-and OS-specific code (e.g. FreeBSD and Linux). Such drivers tend to have
-their own directory under the drivers/scsi directory.
-
-When a new LLD is being added to Linux, the following files (found in the
-drivers/scsi directory) will need some attention: Makefile and Kconfig .
-It is probably best to study how existing LLDs are organized.
-
-As the 2.5 series development kernels evolve into the 2.6 series
-production series, changes are being introduced into this interface. An
-example of this is driver initialization code where there are now 2 models
-available. The older one, similar to what was found in the lk 2.4 series,
-is based on hosts that are detected at HBA driver load time. This will be
-referred to the "passive" initialization model. The newer model allows HBAs
-to be hot plugged (and unplugged) during the lifetime of the LLD and will
-be referred to as the "hotplug" initialization model. The newer model is
-preferred as it can handle both traditional SCSI equipment that is
-permanently connected as well as modern "SCSI" devices (e.g. USB or
-IEEE 1394 connected digital cameras) that are hotplugged. Both
-initialization models are discussed in the following sections.
-
-An LLD interfaces to the SCSI subsystem several ways:
- a) directly invoking functions supplied by the mid level
- b) passing a set of function pointers to a registration function
- supplied by the mid level. The mid level will then invoke these
- functions at some point in the future. The LLD will supply
- implementations of these functions.
- c) direct access to instances of well known data structures maintained
- by the mid level
-
-Those functions in group a) are listed in a section entitled "Mid level
-supplied functions" below.
-
-Those functions in group b) are listed in a section entitled "Interface
-functions" below. Their function pointers are placed in the members of
-"struct scsi_host_template", an instance of which is passed to
-scsi_host_alloc() ** . Those interface functions that the LLD does not
-wish to supply should have NULL placed in the corresponding member of
-struct scsi_host_template. Defining an instance of struct
-scsi_host_template at file scope will cause NULL to be placed in function
- pointer members not explicitly initialized.
-
-Those usages in group c) should be handled with care, especially in a
-"hotplug" environment. LLDs should be aware of the lifetime of instances
-that are shared with the mid level and other layers.
-
-All functions defined within an LLD and all data defined at file scope
-should be static. For example the slave_alloc() function in an LLD
-called "xxx" could be defined as
-"static int xxx_slave_alloc(struct scsi_device * sdev) { /* code */ }"
-
-** the scsi_host_alloc() function is a replacement for the rather vaguely
-named scsi_register() function in most situations.
-
-
-Hotplug initialization model
-============================
-In this model an LLD controls when SCSI hosts are introduced and removed
-from the SCSI subsystem. Hosts can be introduced as early as driver
-initialization and removed as late as driver shutdown. Typically a driver
-will respond to a sysfs probe() callback that indicates an HBA has been
-detected. After confirming that the new device is one that the LLD wants
-to control, the LLD will initialize the HBA and then register a new host
-with the SCSI mid level.
-
-During LLD initialization the driver should register itself with the
-appropriate IO bus on which it expects to find HBA(s) (e.g. the PCI bus).
-This can probably be done via sysfs. Any driver parameters (especially
-those that are writable after the driver is loaded) could also be
-registered with sysfs at this point. The SCSI mid level first becomes
-aware of an LLD when that LLD registers its first HBA.
-
-At some later time, the LLD becomes aware of an HBA and what follows
-is a typical sequence of calls between the LLD and the mid level.
-This example shows the mid level scanning the newly introduced HBA for 3
-scsi devices of which only the first 2 respond:
-
- HBA PROBE: assume 2 SCSI devices found in scan
-LLD mid level LLD
-===-------------------=========--------------------===------
-scsi_host_alloc() -->
-scsi_add_host() ---->
-scsi_scan_host() -------+
- |
- slave_alloc()
- slave_configure() --> scsi_change_queue_depth()
- |
- slave_alloc()
- slave_configure()
- |
- slave_alloc() ***
- slave_destroy() ***
-------------------------------------------------------------
-
-If the LLD wants to adjust the default queue settings, it can invoke
-scsi_change_queue_depth() in its slave_configure() routine.
-
-*** For scsi devices that the mid level tries to scan but do not
- respond, a slave_alloc(), slave_destroy() pair is called.
-
-When an HBA is being removed it could be as part of an orderly shutdown
-associated with the LLD module being unloaded (e.g. with the "rmmod"
-command) or in response to a "hot unplug" indicated by sysfs()'s
-remove() callback being invoked. In either case, the sequence is the
-same:
-
- HBA REMOVE: assume 2 SCSI devices attached
-LLD mid level LLD
-===----------------------=========-----------------===------
-scsi_remove_host() ---------+
- |
- slave_destroy()
- slave_destroy()
-scsi_host_put()
-------------------------------------------------------------
-
-It may be useful for a LLD to keep track of struct Scsi_Host instances
-(a pointer is returned by scsi_host_alloc()). Such instances are "owned"
-by the mid-level. struct Scsi_Host instances are freed from
-scsi_host_put() when the reference count hits zero.
-
-Hot unplugging an HBA that controls a disk which is processing SCSI
-commands on a mounted file system is an interesting situation. Reference
-counting logic is being introduced into the mid level to cope with many
-of the issues involved. See the section on reference counting below.
-
-
-The hotplug concept may be extended to SCSI devices. Currently, when an
-HBA is added, the scsi_scan_host() function causes a scan for SCSI devices
-attached to the HBA's SCSI transport. On newer SCSI transports the HBA
-may become aware of a new SCSI device _after_ the scan has completed.
-An LLD can use this sequence to make the mid level aware of a SCSI device:
-
- SCSI DEVICE hotplug
-LLD mid level LLD
-===-------------------=========--------------------===------
-scsi_add_device() ------+
- |
- slave_alloc()
- slave_configure() [--> scsi_change_queue_depth()]
-------------------------------------------------------------
-
-In a similar fashion, an LLD may become aware that a SCSI device has been
-removed (unplugged) or the connection to it has been interrupted. Some
-existing SCSI transports (e.g. SPI) may not become aware that a SCSI
-device has been removed until a subsequent SCSI command fails which will
-probably cause that device to be set offline by the mid level. An LLD that
-detects the removal of a SCSI device can instigate its removal from
-upper layers with this sequence:
-
- SCSI DEVICE hot unplug
-LLD mid level LLD
-===----------------------=========-----------------===------
-scsi_remove_device() -------+
- |
- slave_destroy()
-------------------------------------------------------------
-
-It may be useful for an LLD to keep track of struct scsi_device instances
-(a pointer is passed as the parameter to slave_alloc() and
-slave_configure() callbacks). Such instances are "owned" by the mid-level.
-struct scsi_device instances are freed after slave_destroy().
-
-
-Reference Counting
-==================
-The Scsi_Host structure has had reference counting infrastructure added.
-This effectively spreads the ownership of struct Scsi_Host instances
-across the various SCSI layers which use them. Previously such instances
-were exclusively owned by the mid level. LLDs would not usually need to
-directly manipulate these reference counts but there may be some cases
-where they do.
-
-There are 3 reference counting functions of interest associated with
-struct Scsi_Host:
- - scsi_host_alloc(): returns a pointer to new instance of struct
- Scsi_Host which has its reference count ^^ set to 1
- - scsi_host_get(): adds 1 to the reference count of the given instance
- - scsi_host_put(): decrements 1 from the reference count of the given
- instance. If the reference count reaches 0 then the given instance
- is freed
-
-The scsi_device structure has had reference counting infrastructure added.
-This effectively spreads the ownership of struct scsi_device instances
-across the various SCSI layers which use them. Previously such instances
-were exclusively owned by the mid level. See the access functions declared
-towards the end of include/scsi/scsi_device.h . If an LLD wants to keep
-a copy of a pointer to a scsi_device instance it should use scsi_device_get()
-to bump its reference count. When it is finished with the pointer it can
-use scsi_device_put() to decrement its reference count (and potentially
-delete it).
-
-^^ struct Scsi_Host actually has 2 reference counts which are manipulated
-in parallel by these functions.
-
-
-Conventions
-===========
-First, Linus Torvalds's thoughts on C coding style can be found in the
-Documentation/process/coding-style.rst file.
-
-Next, there is a movement to "outlaw" typedefs introducing synonyms for
-struct tags. Both can be still found in the SCSI subsystem, but
-the typedefs have been moved to a single file, scsi_typedefs.h to
-make their future removal easier, for example:
-"typedef struct scsi_cmnd Scsi_Cmnd;"
-
-Also, most C99 enhancements are encouraged to the extent they are supported
-by the relevant gcc compilers. So C99 style structure and array
-initializers are encouraged where appropriate. Don't go too far,
-VLAs are not properly supported yet. An exception to this is the use of
-"//" style comments; /*...*/ comments are still preferred in Linux.
-
-Well written, tested and documented code, need not be re-formatted to
-comply with the above conventions. For example, the aic7xxx driver
-comes to Linux from FreeBSD and Adaptec's own labs. No doubt FreeBSD
-and Adaptec have their own coding conventions.
-
-
-Mid level supplied functions
-============================
-These functions are supplied by the SCSI mid level for use by LLDs.
-The names (i.e. entry points) of these functions are exported
-so an LLD that is a module can access them. The kernel will
-arrange for the SCSI mid level to be loaded and initialized before any LLD
-is initialized. The functions below are listed alphabetically and their
-names all start with "scsi_".
-
-Summary:
- scsi_add_device - creates new scsi device (lu) instance
- scsi_add_host - perform sysfs registration and set up transport class
- scsi_change_queue_depth - change the queue depth on a SCSI device
- scsi_bios_ptable - return copy of block device's partition table
- scsi_block_requests - prevent further commands being queued to given host
- scsi_host_alloc - return a new scsi_host instance whose refcount==1
- scsi_host_get - increments Scsi_Host instance's refcount
- scsi_host_put - decrements Scsi_Host instance's refcount (free if 0)
- scsi_register - create and register a scsi host adapter instance.
- scsi_remove_device - detach and remove a SCSI device
- scsi_remove_host - detach and remove all SCSI devices owned by host
- scsi_report_bus_reset - report scsi _bus_ reset observed
- scsi_scan_host - scan SCSI bus
- scsi_track_queue_full - track successive QUEUE_FULL events
- scsi_unblock_requests - allow further commands to be queued to given host
- scsi_unregister - [calls scsi_host_put()]
-
-
-Details:
-
-/**
- * scsi_add_device - creates new scsi device (lu) instance
- * @shost: pointer to scsi host instance
- * @channel: channel number (rarely other than 0)
- * @id: target id number
- * @lun: logical unit number
- *
- * Returns pointer to new struct scsi_device instance or
- * ERR_PTR(-ENODEV) (or some other bent pointer) if something is
- * wrong (e.g. no lu responds at given address)
- *
- * Might block: yes
- *
- * Notes: This call is usually performed internally during a scsi
- * bus scan when an HBA is added (i.e. scsi_scan_host()). So it
- * should only be called if the HBA becomes aware of a new scsi
- * device (lu) after scsi_scan_host() has completed. If successful
- * this call can lead to slave_alloc() and slave_configure() callbacks
- * into the LLD.
- *
- * Defined in: drivers/scsi/scsi_scan.c
- **/
-struct scsi_device * scsi_add_device(struct Scsi_Host *shost,
- unsigned int channel,
- unsigned int id, unsigned int lun)
-
-
-/**
- * scsi_add_host - perform sysfs registration and set up transport class
- * @shost: pointer to scsi host instance
- * @dev: pointer to struct device of type scsi class
- *
- * Returns 0 on success, negative errno of failure (e.g. -ENOMEM)
- *
- * Might block: no
- *
- * Notes: Only required in "hotplug initialization model" after a
- * successful call to scsi_host_alloc(). This function does not
- * scan the bus; this can be done by calling scsi_scan_host() or
- * in some other transport-specific way. The LLD must set up
- * the transport template before calling this function and may only
- * access the transport class data after this function has been called.
- *
- * Defined in: drivers/scsi/hosts.c
- **/
-int scsi_add_host(struct Scsi_Host *shost, struct device * dev)
-
-
-/**
- * scsi_change_queue_depth - allow LLD to change queue depth on a SCSI device
- * @sdev: pointer to SCSI device to change queue depth on
- * @tags Number of tags allowed if tagged queuing enabled,
- * or number of commands the LLD can queue up
- * in non-tagged mode (as per cmd_per_lun).
- *
- * Returns nothing
- *
- * Might block: no
- *
- * Notes: Can be invoked any time on a SCSI device controlled by this
- * LLD. [Specifically during and after slave_configure() and prior to
- * slave_destroy().] Can safely be invoked from interrupt code.
- *
- * Defined in: drivers/scsi/scsi.c [see source code for more notes]
- *
- **/
-int scsi_change_queue_depth(struct scsi_device *sdev, int tags)
-
-
-/**
- * scsi_bios_ptable - return copy of block device's partition table
- * @dev: pointer to block device
- *
- * Returns pointer to partition table, or NULL for failure
- *
- * Might block: yes
- *
- * Notes: Caller owns memory returned (free with kfree() )
- *
- * Defined in: drivers/scsi/scsicam.c
- **/
-unsigned char *scsi_bios_ptable(struct block_device *dev)
-
-
-/**
- * scsi_block_requests - prevent further commands being queued to given host
- *
- * @shost: pointer to host to block commands on
- *
- * Returns nothing
- *
- * Might block: no
- *
- * Notes: There is no timer nor any other means by which the requests
- * get unblocked other than the LLD calling scsi_unblock_requests().
- *
- * Defined in: drivers/scsi/scsi_lib.c
-**/
-void scsi_block_requests(struct Scsi_Host * shost)
-
-
-/**
- * scsi_host_alloc - create a scsi host adapter instance and perform basic
- * initialization.
- * @sht: pointer to scsi host template
- * @privsize: extra bytes to allocate in hostdata array (which is the
- * last member of the returned Scsi_Host instance)
- *
- * Returns pointer to new Scsi_Host instance or NULL on failure
- *
- * Might block: yes
- *
- * Notes: When this call returns to the LLD, the SCSI bus scan on
- * this host has _not_ yet been done.
- * The hostdata array (by default zero length) is a per host scratch
- * area for the LLD's exclusive use.
- * Both associated refcounting objects have their refcount set to 1.
- * Full registration (in sysfs) and a bus scan are performed later when
- * scsi_add_host() and scsi_scan_host() are called.
- *
- * Defined in: drivers/scsi/hosts.c .
- **/
-struct Scsi_Host * scsi_host_alloc(struct scsi_host_template * sht,
- int privsize)
-
-
-/**
- * scsi_host_get - increment Scsi_Host instance refcount
- * @shost: pointer to struct Scsi_Host instance
- *
- * Returns nothing
- *
- * Might block: currently may block but may be changed to not block
- *
- * Notes: Actually increments the counts in two sub-objects
- *
- * Defined in: drivers/scsi/hosts.c
- **/
-void scsi_host_get(struct Scsi_Host *shost)
-
-
-/**
- * scsi_host_put - decrement Scsi_Host instance refcount, free if 0
- * @shost: pointer to struct Scsi_Host instance
- *
- * Returns nothing
- *
- * Might block: currently may block but may be changed to not block
- *
- * Notes: Actually decrements the counts in two sub-objects. If the
- * latter refcount reaches 0, the Scsi_Host instance is freed.
- * The LLD need not worry exactly when the Scsi_Host instance is
- * freed, it just shouldn't access the instance after it has balanced
- * out its refcount usage.
- *
- * Defined in: drivers/scsi/hosts.c
- **/
-void scsi_host_put(struct Scsi_Host *shost)
-
-
-/**
- * scsi_register - create and register a scsi host adapter instance.
- * @sht: pointer to scsi host template
- * @privsize: extra bytes to allocate in hostdata array (which is the
- * last member of the returned Scsi_Host instance)
- *
- * Returns pointer to new Scsi_Host instance or NULL on failure
- *
- * Might block: yes
- *
- * Notes: When this call returns to the LLD, the SCSI bus scan on
- * this host has _not_ yet been done.
- * The hostdata array (by default zero length) is a per host scratch
- * area for the LLD.
- *
- * Defined in: drivers/scsi/hosts.c .
- **/
-struct Scsi_Host * scsi_register(struct scsi_host_template * sht,
- int privsize)
-
-
-/**
- * scsi_remove_device - detach and remove a SCSI device
- * @sdev: a pointer to a scsi device instance
- *
- * Returns value: 0 on success, -EINVAL if device not attached
- *
- * Might block: yes
- *
- * Notes: If an LLD becomes aware that a scsi device (lu) has
- * been removed but its host is still present then it can request
- * the removal of that scsi device. If successful this call will
- * lead to the slave_destroy() callback being invoked. sdev is an
- * invalid pointer after this call.
- *
- * Defined in: drivers/scsi/scsi_sysfs.c .
- **/
-int scsi_remove_device(struct scsi_device *sdev)
-
-
-/**
- * scsi_remove_host - detach and remove all SCSI devices owned by host
- * @shost: a pointer to a scsi host instance
- *
- * Returns value: 0 on success, 1 on failure (e.g. LLD busy ??)
- *
- * Might block: yes
- *
- * Notes: Should only be invoked if the "hotplug initialization
- * model" is being used. It should be called _prior_ to
- * scsi_unregister().
- *
- * Defined in: drivers/scsi/hosts.c .
- **/
-int scsi_remove_host(struct Scsi_Host *shost)
-
-
-/**
- * scsi_report_bus_reset - report scsi _bus_ reset observed
- * @shost: a pointer to a scsi host involved
- * @channel: channel (within) host on which scsi bus reset occurred
- *
- * Returns nothing
- *
- * Might block: no
- *
- * Notes: This only needs to be called if the reset is one which
- * originates from an unknown location. Resets originated by the
- * mid level itself don't need to call this, but there should be
- * no harm. The main purpose of this is to make sure that a
- * CHECK_CONDITION is properly treated.
- *
- * Defined in: drivers/scsi/scsi_error.c .
- **/
-void scsi_report_bus_reset(struct Scsi_Host * shost, int channel)
-
-
-/**
- * scsi_scan_host - scan SCSI bus
- * @shost: a pointer to a scsi host instance
- *
- * Might block: yes
- *
- * Notes: Should be called after scsi_add_host()
- *
- * Defined in: drivers/scsi/scsi_scan.c
- **/
-void scsi_scan_host(struct Scsi_Host *shost)
-
-
-/**
- * scsi_track_queue_full - track successive QUEUE_FULL events on given
- * device to determine if and when there is a need
- * to adjust the queue depth on the device.
- * @sdev: pointer to SCSI device instance
- * @depth: Current number of outstanding SCSI commands on this device,
- * not counting the one returned as QUEUE_FULL.
- *
- * Returns 0 - no change needed
- * >0 - adjust queue depth to this new depth
- * -1 - drop back to untagged operation using host->cmd_per_lun
- * as the untagged command depth
- *
- * Might block: no
- *
- * Notes: LLDs may call this at any time and we will do "The Right
- * Thing"; interrupt context safe.
- *
- * Defined in: drivers/scsi/scsi.c .
- **/
-int scsi_track_queue_full(struct scsi_device *sdev, int depth)
-
-
-/**
- * scsi_unblock_requests - allow further commands to be queued to given host
- *
- * @shost: pointer to host to unblock commands on
- *
- * Returns nothing
- *
- * Might block: no
- *
- * Defined in: drivers/scsi/scsi_lib.c .
-**/
-void scsi_unblock_requests(struct Scsi_Host * shost)
-
-
-/**
- * scsi_unregister - unregister and free memory used by host instance
- * @shp: pointer to scsi host instance to unregister.
- *
- * Returns nothing
- *
- * Might block: no
- *
- * Notes: Should not be invoked if the "hotplug initialization
- * model" is being used. Called internally by exit_this_scsi_driver()
- * in the "passive initialization model". Hence a LLD has no need to
- * call this function directly.
- *
- * Defined in: drivers/scsi/hosts.c .
- **/
-void scsi_unregister(struct Scsi_Host * shp)
-
-
-
-
-Interface Functions
-===================
-Interface functions are supplied (defined) by LLDs and their function
-pointers are placed in an instance of struct scsi_host_template which
-is passed to scsi_host_alloc() [or scsi_register() / init_this_scsi_driver()].
-Some are mandatory. Interface functions should be declared static. The
-accepted convention is that driver "xyz" will declare its slave_configure()
-function as:
- static int xyz_slave_configure(struct scsi_device * sdev);
-and so forth for all interface functions listed below.
-
-A pointer to this function should be placed in the 'slave_configure' member
-of a "struct scsi_host_template" instance. A pointer to such an instance
-should be passed to the mid level's scsi_host_alloc() [or scsi_register() /
-init_this_scsi_driver()].
-
-The interface functions are also described in the include/scsi/scsi_host.h
-file immediately above their definition point in "struct scsi_host_template".
-In some cases more detail is given in scsi_host.h than below.
-
-The interface functions are listed below in alphabetical order.
-
-Summary:
- bios_param - fetch head, sector, cylinder info for a disk
- eh_timed_out - notify the host that a command timer expired
- eh_abort_handler - abort given command
- eh_bus_reset_handler - issue SCSI bus reset
- eh_device_reset_handler - issue SCSI device reset
- eh_host_reset_handler - reset host (host bus adapter)
- info - supply information about given host
- ioctl - driver can respond to ioctls
- proc_info - supports /proc/scsi/{driver_name}/{host_no}
- queuecommand - queue scsi command, invoke 'done' on completion
- slave_alloc - prior to any commands being sent to a new device
- slave_configure - driver fine tuning for given device after attach
- slave_destroy - given device is about to be shut down
-
-
-Details:
-
-/**
- * bios_param - fetch head, sector, cylinder info for a disk
- * @sdev: pointer to scsi device context (defined in
- * include/scsi/scsi_device.h)
- * @bdev: pointer to block device context (defined in fs.h)
- * @capacity: device size (in 512 byte sectors)
- * @params: three element array to place output:
- * params[0] number of heads (max 255)
- * params[1] number of sectors (max 63)
- * params[2] number of cylinders
- *
- * Return value is ignored
- *
- * Locks: none
- *
- * Calling context: process (sd)
- *
- * Notes: an arbitrary geometry (based on READ CAPACITY) is used
- * if this function is not provided. The params array is
- * pre-initialized with made up values just in case this function
- * doesn't output anything.
- *
- * Optionally defined in: LLD
- **/
- int bios_param(struct scsi_device * sdev, struct block_device *bdev,
- sector_t capacity, int params[3])
-
-
-/**
- * eh_timed_out - The timer for the command has just fired
- * @scp: identifies command timing out
- *
- * Returns:
- *
- * EH_HANDLED: I fixed the error, please complete the command
- * EH_RESET_TIMER: I need more time, reset the timer and
- * begin counting again
- * EH_NOT_HANDLED Begin normal error recovery
- *
- *
- * Locks: None held
- *
- * Calling context: interrupt
- *
- * Notes: This is to give the LLD an opportunity to do local recovery.
- * This recovery is limited to determining if the outstanding command
- * will ever complete. You may not abort and restart the command from
- * this callback.
- *
- * Optionally defined in: LLD
- **/
- int eh_timed_out(struct scsi_cmnd * scp)
-
-
-/**
- * eh_abort_handler - abort command associated with scp
- * @scp: identifies command to be aborted
- *
- * Returns SUCCESS if command aborted else FAILED
- *
- * Locks: None held
- *
- * Calling context: kernel thread
- *
- * Notes: If 'no_async_abort' is defined this callback
- * will be invoked from scsi_eh thread. No other commands
- * will then be queued on current host during eh.
- * Otherwise it will be called whenever scsi_times_out()
- * is called due to a command timeout.
- *
- * Optionally defined in: LLD
- **/
- int eh_abort_handler(struct scsi_cmnd * scp)
-
-
-/**
- * eh_bus_reset_handler - issue SCSI bus reset
- * @scp: SCSI bus that contains this device should be reset
- *
- * Returns SUCCESS if command aborted else FAILED
- *
- * Locks: None held
- *
- * Calling context: kernel thread
- *
- * Notes: Invoked from scsi_eh thread. No other commands will be
- * queued on current host during eh.
- *
- * Optionally defined in: LLD
- **/
- int eh_bus_reset_handler(struct scsi_cmnd * scp)
-
-
-/**
- * eh_device_reset_handler - issue SCSI device reset
- * @scp: identifies SCSI device to be reset
- *
- * Returns SUCCESS if command aborted else FAILED
- *
- * Locks: None held
- *
- * Calling context: kernel thread
- *
- * Notes: Invoked from scsi_eh thread. No other commands will be
- * queued on current host during eh.
- *
- * Optionally defined in: LLD
- **/
- int eh_device_reset_handler(struct scsi_cmnd * scp)
-
-
-/**
- * eh_host_reset_handler - reset host (host bus adapter)
- * @scp: SCSI host that contains this device should be reset
- *
- * Returns SUCCESS if command aborted else FAILED
- *
- * Locks: None held
- *
- * Calling context: kernel thread
- *
- * Notes: Invoked from scsi_eh thread. No other commands will be
- * queued on current host during eh.
- * With the default eh_strategy in place, if none of the _abort_,
- * _device_reset_, _bus_reset_ or this eh handler function are
- * defined (or they all return FAILED) then the device in question
- * will be set offline whenever eh is invoked.
- *
- * Optionally defined in: LLD
- **/
- int eh_host_reset_handler(struct scsi_cmnd * scp)
-
-
-/**
- * info - supply information about given host: driver name plus data
- * to distinguish given host
- * @shp: host to supply information about
- *
- * Return ASCII null terminated string. [This driver is assumed to
- * manage the memory pointed to and maintain it, typically for the
- * lifetime of this host.]
- *
- * Locks: none
- *
- * Calling context: process
- *
- * Notes: Often supplies PCI or ISA information such as IO addresses
- * and interrupt numbers. If not supplied struct Scsi_Host::name used
- * instead. It is assumed the returned information fits on one line
- * (i.e. does not included embedded newlines).
- * The SCSI_IOCTL_PROBE_HOST ioctl yields the string returned by this
- * function (or struct Scsi_Host::name if this function is not
- * available).
- * In a similar manner, init_this_scsi_driver() outputs to the console
- * each host's "info" (or name) for the driver it is registering.
- * Also if proc_info() is not supplied, the output of this function
- * is used instead.
- *
- * Optionally defined in: LLD
- **/
- const char * info(struct Scsi_Host * shp)
-
-
-/**
- * ioctl - driver can respond to ioctls
- * @sdp: device that ioctl was issued for
- * @cmd: ioctl number
- * @arg: pointer to read or write data from. Since it points to
- * user space, should use appropriate kernel functions
- * (e.g. copy_from_user() ). In the Unix style this argument
- * can also be viewed as an unsigned long.
- *
- * Returns negative "errno" value when there is a problem. 0 or a
- * positive value indicates success and is returned to the user space.
- *
- * Locks: none
- *
- * Calling context: process
- *
- * Notes: The SCSI subsystem uses a "trickle down" ioctl model.
- * The user issues an ioctl() against an upper level driver
- * (e.g. /dev/sdc) and if the upper level driver doesn't recognize
- * the 'cmd' then it is passed to the SCSI mid level. If the SCSI
- * mid level does not recognize it, then the LLD that controls
- * the device receives the ioctl. According to recent Unix standards
- * unsupported ioctl() 'cmd' numbers should return -ENOTTY.
- *
- * Optionally defined in: LLD
- **/
- int ioctl(struct scsi_device *sdp, int cmd, void *arg)
-
-
-/**
- * proc_info - supports /proc/scsi/{driver_name}/{host_no}
- * @buffer: anchor point to output to (0==writeto1_read0) or fetch from
- * (1==writeto1_read0).
- * @start: where "interesting" data is written to. Ignored when
- * 1==writeto1_read0.
- * @offset: offset within buffer 0==writeto1_read0 is actually
- * interested in. Ignored when 1==writeto1_read0 .
- * @length: maximum (or actual) extent of buffer
- * @host_no: host number of interest (struct Scsi_Host::host_no)
- * @writeto1_read0: 1 -> data coming from user space towards driver
- * (e.g. "echo some_string > /proc/scsi/xyz/2")
- * 0 -> user what data from this driver
- * (e.g. "cat /proc/scsi/xyz/2")
- *
- * Returns length when 1==writeto1_read0. Otherwise number of chars
- * output to buffer past offset.
- *
- * Locks: none held
- *
- * Calling context: process
- *
- * Notes: Driven from scsi_proc.c which interfaces to proc_fs. proc_fs
- * support can now be configured out of the scsi subsystem.
- *
- * Optionally defined in: LLD
- **/
- int proc_info(char * buffer, char ** start, off_t offset,
- int length, int host_no, int writeto1_read0)
-
-
-/**
- * queuecommand - queue scsi command, invoke scp->scsi_done on completion
- * @shost: pointer to the scsi host object
- * @scp: pointer to scsi command object
- *
- * Returns 0 on success.
- *
- * If there's a failure, return either:
- *
- * SCSI_MLQUEUE_DEVICE_BUSY if the device queue is full, or
- * SCSI_MLQUEUE_HOST_BUSY if the entire host queue is full
- *
- * On both of these returns, the mid-layer will requeue the I/O
- *
- * - if the return is SCSI_MLQUEUE_DEVICE_BUSY, only that particular
- * device will be paused, and it will be unpaused when a command to
- * the device returns (or after a brief delay if there are no more
- * outstanding commands to it). Commands to other devices continue
- * to be processed normally.
- *
- * - if the return is SCSI_MLQUEUE_HOST_BUSY, all I/O to the host
- * is paused and will be unpaused when any command returns from
- * the host (or after a brief delay if there are no outstanding
- * commands to the host).
- *
- * For compatibility with earlier versions of queuecommand, any
- * other return value is treated the same as
- * SCSI_MLQUEUE_HOST_BUSY.
- *
- * Other types of errors that are detected immediately may be
- * flagged by setting scp->result to an appropriate value,
- * invoking the scp->scsi_done callback, and then returning 0
- * from this function. If the command is not performed
- * immediately (and the LLD is starting (or will start) the given
- * command) then this function should place 0 in scp->result and
- * return 0.
- *
- * Command ownership. If the driver returns zero, it owns the
- * command and must take responsibility for ensuring the
- * scp->scsi_done callback is executed. Note: the driver may
- * call scp->scsi_done before returning zero, but after it has
- * called scp->scsi_done, it may not return any value other than
- * zero. If the driver makes a non-zero return, it must not
- * execute the command's scsi_done callback at any time.
- *
- * Locks: up to and including 2.6.36, struct Scsi_Host::host_lock
- * held on entry (with "irqsave") and is expected to be
- * held on return. From 2.6.37 onwards, queuecommand is
- * called without any locks held.
- *
- * Calling context: in interrupt (soft irq) or process context
- *
- * Notes: This function should be relatively fast. Normally it
- * will not wait for IO to complete. Hence the scp->scsi_done
- * callback is invoked (often directly from an interrupt service
- * routine) some time after this function has returned. In some
- * cases (e.g. pseudo adapter drivers that manufacture the
- * response to a SCSI INQUIRY) the scp->scsi_done callback may be
- * invoked before this function returns. If the scp->scsi_done
- * callback is not invoked within a certain period the SCSI mid
- * level will commence error processing. If a status of CHECK
- * CONDITION is placed in "result" when the scp->scsi_done
- * callback is invoked, then the LLD driver should perform
- * autosense and fill in the struct scsi_cmnd::sense_buffer
- * array. The scsi_cmnd::sense_buffer array is zeroed prior to
- * the mid level queuing a command to an LLD.
- *
- * Defined in: LLD
- **/
- int queuecommand(struct Scsi_Host *shost, struct scsi_cmnd * scp)
-
-
-/**
- * slave_alloc - prior to any commands being sent to a new device
- * (i.e. just prior to scan) this call is made
- * @sdp: pointer to new device (about to be scanned)
- *
- * Returns 0 if ok. Any other return is assumed to be an error and
- * the device is ignored.
- *
- * Locks: none
- *
- * Calling context: process
- *
- * Notes: Allows the driver to allocate any resources for a device
- * prior to its initial scan. The corresponding scsi device may not
- * exist but the mid level is just about to scan for it (i.e. send
- * and INQUIRY command plus ...). If a device is found then
- * slave_configure() will be called while if a device is not found
- * slave_destroy() is called.
- * For more details see the include/scsi/scsi_host.h file.
- *
- * Optionally defined in: LLD
- **/
- int slave_alloc(struct scsi_device *sdp)
-
-
-/**
- * slave_configure - driver fine tuning for given device just after it
- * has been first scanned (i.e. it responded to an
- * INQUIRY)
- * @sdp: device that has just been attached
- *
- * Returns 0 if ok. Any other return is assumed to be an error and
- * the device is taken offline. [offline devices will _not_ have
- * slave_destroy() called on them so clean up resources.]
- *
- * Locks: none
- *
- * Calling context: process
- *
- * Notes: Allows the driver to inspect the response to the initial
- * INQUIRY done by the scanning code and take appropriate action.
- * For more details see the include/scsi/scsi_host.h file.
- *
- * Optionally defined in: LLD
- **/
- int slave_configure(struct scsi_device *sdp)
-
-
-/**
- * slave_destroy - given device is about to be shut down. All
- * activity has ceased on this device.
- * @sdp: device that is about to be shut down
- *
- * Returns nothing
- *
- * Locks: none
- *
- * Calling context: process
- *
- * Notes: Mid level structures for given device are still in place
- * but are about to be torn down. Any per device resources allocated
- * by this driver for given device should be freed now. No further
- * commands will be sent for this sdp instance. [However the device
- * could be re-attached in the future in which case a new instance
- * of struct scsi_device would be supplied by future slave_alloc()
- * and slave_configure() calls.]
- *
- * Optionally defined in: LLD
- **/
- void slave_destroy(struct scsi_device *sdp)
-
-
-
-Data Structures
-===============
-struct scsi_host_template
--------------------------
-There is one "struct scsi_host_template" instance per LLD ***. It is
-typically initialized as a file scope static in a driver's header file. That
-way members that are not explicitly initialized will be set to 0 or NULL.
-Member of interest:
- name - name of driver (may contain spaces, please limit to
- less than 80 characters)
- proc_name - name used in "/proc/scsi/<proc_name>/<host_no>" and
- by sysfs in one of its "drivers" directories. Hence
- "proc_name" should only contain characters acceptable
- to a Unix file name.
- (*queuecommand)() - primary callback that the mid level uses to inject
- SCSI commands into an LLD.
-The structure is defined and commented in include/scsi/scsi_host.h
-
-*** In extreme situations a single driver may have several instances
- if it controls several different classes of hardware (e.g. an LLD
- that handles both ISA and PCI cards and has a separate instance of
- struct scsi_host_template for each class).
-
-struct Scsi_Host
-----------------
-There is one struct Scsi_Host instance per host (HBA) that an LLD
-controls. The struct Scsi_Host structure has many members in common
-with "struct scsi_host_template". When a new struct Scsi_Host instance
-is created (in scsi_host_alloc() in hosts.c) those common members are
-initialized from the driver's struct scsi_host_template instance. Members
-of interest:
- host_no - system wide unique number that is used for identifying
- this host. Issued in ascending order from 0.
- can_queue - must be greater than 0; do not send more than can_queue
- commands to the adapter.
- this_id - scsi id of host (scsi initiator) or -1 if not known
- sg_tablesize - maximum scatter gather elements allowed by host.
- Set this to SG_ALL or less to avoid chained SG lists.
- Must be at least 1.
- max_sectors - maximum number of sectors (usually 512 bytes) allowed
- in a single SCSI command. The default value of 0 leads
- to a setting of SCSI_DEFAULT_MAX_SECTORS (defined in
- scsi_host.h) which is currently set to 1024. So for a
- disk the maximum transfer size is 512 KB when max_sectors
- is not defined. Note that this size may not be sufficient
- for disk firmware uploads.
- cmd_per_lun - maximum number of commands that can be queued on devices
- controlled by the host. Overridden by LLD calls to
- scsi_change_queue_depth().
- unchecked_isa_dma - 1=>only use bottom 16 MB of ram (ISA DMA addressing
- restriction), 0=>can use full 32 bit (or better) DMA
- address space
- no_async_abort - 1=>Asynchronous aborts are not supported
- 0=>Timed-out commands will be aborted asynchronously
- hostt - pointer to driver's struct scsi_host_template from which
- this struct Scsi_Host instance was spawned
- hostt->proc_name - name of LLD. This is the driver name that sysfs uses
- transportt - pointer to driver's struct scsi_transport_template instance
- (if any). FC and SPI transports currently supported.
- sh_list - a double linked list of pointers to all struct Scsi_Host
- instances (currently ordered by ascending host_no)
- my_devices - a double linked list of pointers to struct scsi_device
- instances that belong to this host.
- hostdata[0] - area reserved for LLD at end of struct Scsi_Host. Size
- is set by the second argument (named 'xtr_bytes') to
- scsi_host_alloc() or scsi_register().
- vendor_id - a unique value that identifies the vendor supplying
- the LLD for the Scsi_Host. Used most often in validating
- vendor-specific message requests. Value consists of an
- identifier type and a vendor-specific value.
- See scsi_netlink.h for a description of valid formats.
-
-The scsi_host structure is defined in include/scsi/scsi_host.h
-
-struct scsi_device
-------------------
-Generally, there is one instance of this structure for each SCSI logical unit
-on a host. Scsi devices connected to a host are uniquely identified by a
-channel number, target id and logical unit number (lun).
-The structure is defined in include/scsi/scsi_device.h
-
-struct scsi_cmnd
-----------------
-Instances of this structure convey SCSI commands to the LLD and responses
-back to the mid level. The SCSI mid level will ensure that no more SCSI
-commands become queued against the LLD than are indicated by
-scsi_change_queue_depth() (or struct Scsi_Host::cmd_per_lun). There will
-be at least one instance of struct scsi_cmnd available for each SCSI device.
-Members of interest:
- cmnd - array containing SCSI command
- cmnd_len - length (in bytes) of SCSI command
- sc_data_direction - direction of data transfer in data phase. See
- "enum dma_data_direction" in include/linux/dma-mapping.h
- request_bufflen - number of data bytes to transfer (0 if no data phase)
- use_sg - ==0 -> no scatter gather list, hence transfer data
- to/from request_buffer
- - >0 -> scatter gather list (actually an array) in
- request_buffer with use_sg elements
- request_buffer - either contains data buffer or scatter gather list
- depending on the setting of use_sg. Scatter gather
- elements are defined by 'struct scatterlist' found
- in include/linux/scatterlist.h .
- done - function pointer that should be invoked by LLD when the
- SCSI command is completed (successfully or otherwise).
- Should only be called by an LLD if the LLD has accepted
- the command (i.e. queuecommand() returned or will return
- 0). The LLD may invoke 'done' prior to queuecommand()
- finishing.
- result - should be set by LLD prior to calling 'done'. A value
- of 0 implies a successfully completed command (and all
- data (if any) has been transferred to or from the SCSI
- target device). 'result' is a 32 bit unsigned integer that
- can be viewed as 4 related bytes. The SCSI status value is
- in the LSB. See include/scsi/scsi.h status_byte(),
- msg_byte(), host_byte() and driver_byte() macros and
- related constants.
- sense_buffer - an array (maximum size: SCSI_SENSE_BUFFERSIZE bytes) that
- should be written when the SCSI status (LSB of 'result')
- is set to CHECK_CONDITION (2). When CHECK_CONDITION is
- set, if the top nibble of sense_buffer[0] has the value 7
- then the mid level will assume the sense_buffer array
- contains a valid SCSI sense buffer; otherwise the mid
- level will issue a REQUEST_SENSE SCSI command to
- retrieve the sense buffer. The latter strategy is error
- prone in the presence of command queuing so the LLD should
- always "auto-sense".
- device - pointer to scsi_device object that this command is
- associated with.
- resid - an LLD should set this signed integer to the requested
- transfer length (i.e. 'request_bufflen') less the number
- of bytes that are actually transferred. 'resid' is
- preset to 0 so an LLD can ignore it if it cannot detect
- underruns (overruns should be rare). If possible an LLD
- should set 'resid' prior to invoking 'done'. The most
- interesting case is data transfers from a SCSI target
- device (e.g. READs) that underrun.
- underflow - LLD should place (DID_ERROR << 16) in 'result' if
- actual number of bytes transferred is less than this
- figure. Not many LLDs implement this check and some that
- do just output an error message to the log rather than
- report a DID_ERROR. Better for an LLD to implement
- 'resid'.
-
-It is recommended that a LLD set 'resid' on data transfers from a SCSI
-target device (e.g. READs). It is especially important that 'resid' is set
-when such data transfers have sense keys of MEDIUM ERROR and HARDWARE ERROR
-(and possibly RECOVERED ERROR). In these cases if a LLD is in doubt how much
-data has been received then the safest approach is to indicate no bytes have
-been received. For example: to indicate that no valid data has been received
-a LLD might use these helpers:
- scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
-where 'SCpnt' is a pointer to a scsi_cmnd object. To indicate only three 512
-bytes blocks has been received 'resid' could be set like this:
- scsi_set_resid(SCpnt, scsi_bufflen(SCpnt) - (3 * 512));
-
-The scsi_cmnd structure is defined in include/scsi/scsi_cmnd.h
-
-
-Locks
-=====
-Each struct Scsi_Host instance has a spin_lock called struct
-Scsi_Host::default_lock which is initialized in scsi_host_alloc() [found in
-hosts.c]. Within the same function the struct Scsi_Host::host_lock pointer
-is initialized to point at default_lock. Thereafter lock and unlock
-operations performed by the mid level use the struct Scsi_Host::host_lock
-pointer. Previously drivers could override the host_lock pointer but
-this is not allowed anymore.
-
-
-Autosense
-=========
-Autosense (or auto-sense) is defined in the SAM-2 document as "the
-automatic return of sense data to the application client coincident
-with the completion of a SCSI command" when a status of CHECK CONDITION
-occurs. LLDs should perform autosense. This should be done when the LLD
-detects a CHECK CONDITION status by either:
- a) instructing the SCSI protocol (e.g. SCSI Parallel Interface (SPI))
- to perform an extra data in phase on such responses
- b) or, the LLD issuing a REQUEST SENSE command itself
-
-Either way, when a status of CHECK CONDITION is detected, the mid level
-decides whether the LLD has performed autosense by checking struct
-scsi_cmnd::sense_buffer[0] . If this byte has an upper nibble of 7 (or 0xf)
-then autosense is assumed to have taken place. If it has another value (and
-this byte is initialized to 0 before each command) then the mid level will
-issue a REQUEST SENSE command.
-
-In the presence of queued commands the "nexus" that maintains sense
-buffer data from the command that failed until a following REQUEST SENSE
-may get out of synchronization. This is why it is best for the LLD
-to perform autosense.
-
-
-Changes since lk 2.4 series
-===========================
-io_request_lock has been replaced by several finer grained locks. The lock
-relevant to LLDs is struct Scsi_Host::host_lock and there is
-one per SCSI host.
-
-The older error handling mechanism has been removed. This means the
-LLD interface functions abort() and reset() have been removed.
-The struct scsi_host_template::use_new_eh_code flag has been removed.
-
-In the 2.4 series the SCSI subsystem configuration descriptions were
-aggregated with the configuration descriptions from all other Linux
-subsystems in the Documentation/Configure.help file. In the 2.6 series,
-the SCSI subsystem now has its own (much smaller) drivers/scsi/Kconfig
-file that contains both configuration and help information.
-
-struct SHT has been renamed to struct scsi_host_template.
-
-Addition of the "hotplug initialization model" and many extra functions
-to support it.
-
-
-Credits
-=======
-The following people have contributed to this document:
- Mike Anderson <andmike at us dot ibm dot com>
- James Bottomley <James dot Bottomley at hansenpartnership dot com>
- Patrick Mansfield <patmans at us dot ibm dot com>
- Christoph Hellwig <hch at infradead dot org>
- Doug Ledford <dledford at redhat dot com>
- Andries Brouwer <Andries dot Brouwer at cwi dot nl>
- Randy Dunlap <rdunlap at xenotime dot net>
- Alan Stern <stern at rowland dot harvard dot edu>
-
-
-Douglas Gilbert
-dgilbert at interlog dot com
-21st September 2004