scsi: mylex: Fix sysfs buffer lengths

The myrb and myrs drivers use an odd way of implementing their sysfs files,
calling snprintf() with a fixed length of 32 bytes to print into a page
sized buffer. One of the strings is actually longer than 32 bytes, which
clang can warn about:

drivers/scsi/myrb.c:1906:10: error: 'snprintf' will always be truncated; specified size is 32, but format string expands to at least 34 [-Werror,-Wformat-truncation]
drivers/scsi/myrs.c:1089:10: error: 'snprintf' will always be truncated; specified size is 32, but format string expands to at least 34 [-Werror,-Wformat-truncation]

These could all be plain sprintf() without a length as the buffer is always
long enough. On the other hand, sysfs files should not be overly long
either, so just double the length to make sure the longest strings don't
get truncated here.

Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
Fixes: 081ff398c56c ("scsi: myrb: Add Mylex RAID controller (block interface)")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240326223825.4084412-8-arnd@kernel.org
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Declare SCSI host template const

Make it explicit that the SCSI host template is not modified.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230322195515.1267197-60-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Fix crash in error case

In myrs_detect(), cs->disable_intr is NULL when privdata->hw_init() fails
with non-zero. In this case, myrs_cleanup(cs) will call a NULL ptr and
crash the kernel.

[ 1.105606] myrs 0000:00:03.0: Unknown Initialization Error 5A
[ 1.105872] myrs 0000:00:03.0: Failed to initialize Controller
[ 1.106082] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 1.110774] Call Trace:
[ 1.110950] myrs_cleanup+0xe4/0x150 [myrs]
[ 1.111135] myrs_probe.cold+0x91/0x56a [myrs]
[ 1.111302] ? DAC960_GEM_intr_handler+0x1f0/0x1f0 [myrs]
[ 1.111500] local_pci_probe+0x48/0x90

Link: https://lore.kernel.org/r/20220123225717.1069538-1-ztong0001@gmail.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Don't use GFP_DMA

The myrs devices supports 64-bit addressing, so remove the spurious GFP_DMA
allocations.

Link: https://lore.kernel.org/r/20211222091935.925624-1-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Switch to attribute groups

struct device supports attribute groups directly but does not support
struct device_attribute directly. Hence switch to attribute groups.

Link: https://lore.kernel.org/r/20211012233558.4066756-33-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Call scsi_done() directly

Conditional statements are faster than indirect calls. Hence call
scsi_done() directly.

Link: https://lore.kernel.org/r/20211007202923.2174984-56-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Use scsi_cmd_to_rq() instead of scsi_cmnd.request

Prepare for removal of the request pointer by using scsi_cmd_to_rq()
instead. This patch does not change any functionality.

Link: https://lore.kernel.org/r/20210809230355.8186-34-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: core: Introduce scsi_build_sense()

Introduce scsi_build_sense() as a wrapper around scsi_build_sense_buffer()
to format the buffer and set the correct SCSI status.

Link: https://lore.kernel.org/r/20210427083046.31620-8-hare@suse.de
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Remove unused functions

This was detected by building the kernel with clang and W=1.

Link: https://lore.kernel.org/r/20210415220826.29438-12-bvanassche@acm.org
Cc: Hannes Reinecke <hare@kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Make symbols DAC960_{GEM/BA/LP}_privdata static

This symbol is not used outside of myrs.c, so we can mark it static.

Link: https://lore.kernel.org/r/20210327073157.1786772-1-liushixin2@huawei.com
Signed-off-by: Shixin Liu <liushixin2@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Add missing ':' to make the kernel-doc checker happy

Fixes the following W=1 kernel build warning(s):

drivers/scsi/myrs.c:1965: warning: Function parameter or member 'dev' not described in 'myrs_is_raid'
drivers/scsi/myrs.c:1978: warning: Function parameter or member 'dev' not described in 'myrs_get_resync'
drivers/scsi/myrs.c:2002: warning: Function parameter or member 'dev' not described in 'myrs_get_state'

Link: https://lore.kernel.org/r/20210317091230.2912389-13-lee.jones@linaro.org
Cc: Hannes Reinecke <hare@kernel.org>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Linux GmbH <hare@suse.com>
Cc: "Leonard N. Zubkoff" <lnz@dandelion.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Remove a couple of unused 'status' variables

Fixes the following W=1 kernel build warning(s):

drivers/scsi/myrs.c: In function ‘consistency_check_show’:
drivers/scsi/myrs.c:1193:16: warning: variable ‘status’ set but not used [-Wunused-but-set-variable]
drivers/scsi/myrs.c: In function ‘myrs_get_resync’:
drivers/scsi/myrs.c:1984:5: warning: variable ‘status’ set but not used [-Wunused-but-set-variable]

Link: https://lore.kernel.org/r/20210312094738.2207817-28-lee.jones@linaro.org
Cc: Hannes Reinecke <hare@kernel.org>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Linux GmbH <hare@suse.com>
Cc: "Leonard N. Zubkoff" <lnz@dandelion.com>
Cc: linux-scsi@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Fix a double free in myrs_cleanup()

In myrs_cleanup(), cs->mmio_base will be freed twice by iounmap().

Link: https://lore.kernel.org/r/20210311063005.9963-1-lyl2019@mail.ustc.edu.cn
Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Remove WARN_ON(in_interrupt())

The in_interrupt() macro is ill-defined and does not provide what the name
suggests. The usage especially in driver code is deprecated and a tree-wide
effort to clean up and consolidate the (ab)usage of in_interrupt() and
related checks is happening.

In this case the check covers only parts of the contexts in which these
functions cannot be called. It fails to detect preemption or interrupt
disabled invocations.

As wait_for_completion() already contains a broad variety of checks (always
enabled or debug option dependent) which cover all invalid conditions
already, there is no point in having extra inconsistent warnings in
drivers.

Just remove it.

Link: https://lore.kernel.org/r/20201126132952.2287996-12-bigeasy@linutronix.de
Cc: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Make some symbols static

This addresses the following sparse warning:

drivers/scsi/myrs.c:1532:5: warning: symbol 'myrs_host_reset' was not
declared. Should it be static?
drivers/scsi/myrs.c:1922:27: warning: symbol 'myrs_template' was not
declared. Should it be static?
drivers/scsi/myrs.c:2036:31: warning: symbol 'myrs_raid_functions' was
not declared. Should it be static?
drivers/scsi/myrs.c:2046:6: warning: symbol 'myrs_flush_cache' was not
declared. Should it be static?

Link: https://lore.kernel.org/r/20200915084008.2826835-1-yanaijie@huawei.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Demote obvious misuse of kerneldoc to standard comment blocks

No attempt has been made to document any of the demoted functions here.

Fixes the following W=1 kernel build warning(s):

drivers/scsi/myrs.c:94: warning: Function parameter or member 'cmd_blk' not described in 'myrs_reset_cmd'
drivers/scsi/myrs.c:105: warning: Function parameter or member 'cs' not described in 'myrs_qcmd'
drivers/scsi/myrs.c:105: warning: Function parameter or member 'cmd_blk' not described in 'myrs_qcmd'
drivers/scsi/myrs.c:130: warning: Function parameter or member 'cs' not described in 'myrs_exec_cmd'
drivers/scsi/myrs.c:130: warning: Function parameter or member 'cmd_blk' not described in 'myrs_exec_cmd'
drivers/scsi/myrs.c:149: warning: Function parameter or member 'cs' not described in 'myrs_report_progress'
drivers/scsi/myrs.c:149: warning: Function parameter or member 'ldev_num' not described in 'myrs_report_progress'
drivers/scsi/myrs.c:149: warning: Function parameter or member 'msg' not described in 'myrs_report_progress'
drivers/scsi/myrs.c:149: warning: Function parameter or member 'blocks' not described in 'myrs_report_progress'
drivers/scsi/myrs.c:149: warning: Function parameter or member 'size' not described in 'myrs_report_progress'
drivers/scsi/myrs.c:160: warning: Function parameter or member 'cs' not described in 'myrs_get_ctlr_info'
drivers/scsi/myrs.c:222: warning: Function parameter or member 'cs' not described in 'myrs_get_ldev_info'
drivers/scsi/myrs.c:222: warning: Function parameter or member 'ldev_num' not described in 'myrs_get_ldev_info'
drivers/scsi/myrs.c:222: warning: Function parameter or member 'ldev_info' not described in 'myrs_get_ldev_info'
drivers/scsi/myrs.c:310: warning: Function parameter or member 'cs' not described in 'myrs_get_pdev_info'
drivers/scsi/myrs.c:310: warning: Function parameter or member 'channel' not described in 'myrs_get_pdev_info'
drivers/scsi/myrs.c:310: warning: Function parameter or member 'target' not described in 'myrs_get_pdev_info'
drivers/scsi/myrs.c:310: warning: Function parameter or member 'lun' not described in 'myrs_get_pdev_info'
drivers/scsi/myrs.c:310: warning: Function parameter or member 'pdev_info' not described in 'myrs_get_pdev_info'
drivers/scsi/myrs.c:353: warning: Function parameter or member 'cs' not described in 'myrs_dev_op'
drivers/scsi/myrs.c:353: warning: Function parameter or member 'opcode' not described in 'myrs_dev_op'
drivers/scsi/myrs.c:353: warning: Function parameter or member 'opdev' not described in 'myrs_dev_op'
drivers/scsi/myrs.c:379: warning: Function parameter or member 'cs' not described in 'myrs_translate_pdev'
drivers/scsi/myrs.c:379: warning: Function parameter or member 'channel' not described in 'myrs_translate_pdev'
drivers/scsi/myrs.c:379: warning: Function parameter or member 'target' not described in 'myrs_translate_pdev'
drivers/scsi/myrs.c:379: warning: Function parameter or member 'lun' not described in 'myrs_translate_pdev'
drivers/scsi/myrs.c:379: warning: Function parameter or member 'devmap' not described in 'myrs_translate_pdev'
drivers/scsi/myrs.c:422: warning: Function parameter or member 'cs' not described in 'myrs_get_event'
drivers/scsi/myrs.c:422: warning: Function parameter or member 'event_num' not described in 'myrs_get_event'
drivers/scsi/myrs.c:422: warning: Function parameter or member 'event_buf' not described in 'myrs_get_event'
drivers/scsi/myrs.c:484: warning: Function parameter or member 'cs' not described in 'myrs_enable_mmio_mbox'
drivers/scsi/myrs.c:484: warning: Function parameter or member 'enable_mbox_fn' not described in 'myrs_enable_mmio_mbox'
drivers/scsi/myrs.c:584: warning: Function parameter or member 'cs' not described in 'myrs_get_config'
drivers/scsi/myrs.c:688: warning: cannot understand function prototype: 'struct '
drivers/scsi/myrs.c:1967: warning: Function parameter or member 'dev' not described in 'myrs_is_raid'
drivers/scsi/myrs.c:1980: warning: Function parameter or member 'dev' not described in 'myrs_get_resync'
drivers/scsi/myrs.c:2005: warning: Function parameter or member 'dev' not described in 'myrs_get_state'
drivers/scsi/myrs.c:2343: warning: bad line: the Error Status Register when the driver performs the BIOS handshaking.
drivers/scsi/myrs.c:2344: warning: bad line: It returns true for fatal errors and false otherwise.
drivers/scsi/myrs.c:2349: warning: Function parameter or member 'cs' not described in 'myrs_err_status'
drivers/scsi/myrs.c:2349: warning: Function parameter or member 'status' not described in 'myrs_err_status'
drivers/scsi/myrs.c:2349: warning: Function parameter or member 'parm0' not described in 'myrs_err_status'
drivers/scsi/myrs.c:2349: warning: Function parameter or member 'parm1' not described in 'myrs_err_status'

Link: https://lore.kernel.org/r/20200713080001.128044-16-lee.jones@linaro.org
Cc: Hannes Reinecke <hare@kernel.org>
Cc: Linux GmbH <hare@suse.com>
Cc: "Leonard N. Zubkoff" <lnz@dandelion.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

remove ioremap_nocache and devm_ioremap_nocache

ioremap has provided non-cached semantics by default since the Linux 2.6
days, so remove the additional ioremap_nocache interface.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>

scsi: myrs: Fix uninitialized variable

drivers/scsi/myrs.c: In function 'myrs_log_event':
drivers/scsi/myrs.c:821:24: warning: 'sshdr.sense_key' may be used uninitialized in this function [-Wmaybe-uninitialized]
struct scsi_sense_hdr sshdr;

If ev->ev_code is not 0x1C, sshdr.sense_key may be used uninitialized. Fix
this by initializing variable 'sshdr' to 0.

Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: remove the dma_boundary_limit

The old DAC960 driver was fine with merging over segment boundaries, so
this new driver should be too.

[mkp: typos]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: remove the use_clustering flag

The same effects can be achieved by setting the dma_boundary to
PAGE_SIZE - 1 and the max_segment_size to PAGE_SIZE, so shift those
settings into the drivers. Note that in many cases the setting might
be bogus, but this keeps the status quo.

[mkp: fix myrs and myrb]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: make sure all drivers set the use_clustering flag

A few drivers were not setting the use_clustering flag at all and thus
default to disable. Fix them up to explicitly set this field in
preparation for additional cleanups.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: avoid stack overflow warning

Putting a 1024 byte data structure on the stack is generally a bad idea.
On 32-bit systems, it also triggers a compile-time warning when building
with -Og:

drivers/scsi/myrs.c: In function 'myrs_get_ctlr_info':
drivers/scsi/myrs.c:212:1: error: the frame size of 1028 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

We only really need three members of the structure, so just read them
manually here instead of copying the entire structure.

Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Fix the processor absent message in processor_show()

If both processors are absent then it's supposed to print that, but
instead we print that just the second processor is absent.

Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Fix a logical vs bitwise bug

The || was supposed to be |. The original code just sets ->result to 1.

Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: fix build failure on 32 bit

For 32 bit versions we have to be careful about divisions of 64 bit
quantities so use do_div() instead of a direct division. This fixes a
warning about _uldivmod being undefined in certain configurations

Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: myrs: Add Mylex RAID controller (SCSI interface)

This patch adds support for the Mylex DAC960 RAID controller,
supporting the newer, SCSI-based interface. The driver is a
re-implementation of the original DAC960 driver.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>