During error test case where switch port status is toggled from enable to
disable, following stack trace is seen which indicates recursion trying to
send terminate exchange.  This regression was introduced by commit
82de802a ("scsi: qla2xxx: Preparation for Target MQ.")

BUG: stack guard page was hit at ffffb96488383ff8 (stack is ffffb96488384000..ffffb96488387fff)
BUG: stack guard page was hit at ffffb964886c3ff8 (stack is ffffb964886c4000..ffffb964886c7fff)
kernel stack overflow (double-fault): 0000 [#1] SMP
qlt_term_ctio_exchange+0x9c/0xb0 [qla2xxx]
qlt_term_ctio_exchange+0x9c/0xb0 [qla2xxx]
qlt_term_ctio_exchange+0x9c/0xb0 [qla2xxx]
qlt_term_ctio_exchange+0x9c/0xb0 [qla2xxx]
qlt_term_ctio_exchange+0x9c/0xb0 [qla2xxx]

Fixes: 82de802a ("scsi: qla2xxx: Preparation for Target MQ.")
Cc: <stable@vger.kernel.org> #4.10
Signed-off-by: NHimanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch fixes regression added by commit d7459527
("scsi: qla2xxx: Add multiple queue pair functionality.").

When driver is not able to get reqeusted IRQs from the system, driver will
attempt tp clean up memory before failing hardware probe. During this cleanup,
driver assigns NULL value to the pointer which has not been allocated by
driver yet. This results in a NULL pointer access.

Log file will show following message and stack trace

qla2xxx [0000:a3:00.1]-00c7:21: MSI-X: Failed to enable support, giving up -- 32/-1.
qla2xxx [0000:a3:00.1]-0037:21: Falling back-to MSI mode --1.
qla2xxx [0000:a3:00.1]-003a:21: Failed to reserve interrupt 821 already in use.
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffc010c4b6>] qla2x00_probe_one+0x18b6/0x2730 [qla2xxx]
PGD 0
Oops: 0002 [#1] SMP

Fixes: d7459527 ("scsi: qla2xxx: Add multiple queue pair functionality.").
Cc: <stable@vger.kernel.org> # 4.10
Signed-off-by: NHimanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The pointer head is re-assigned the same value twice, so remove the
second redundant assignment.

Cleans up clang warning:
drivers/message/fusion/mptsas.c:1161:20: warning: Value stored to 'head'
during its initialization is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

We should set the error code if fc_remote_port_add() fails.

Cc: <stable@vger.kernel.org> #v4.12+
Fixes: daf0cd44 ("scsi: storvsc: Add support for FC rport.")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NCathy Avery <cavery@redhat.com>
Acked-by: NK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Numbers up to 100 snprintf() prints without using a division.  Besides
that the code looks more readable.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The function _get_st_from_smid is local to the source and does not need
to be in global scope, so make it static.

Cleans up sparse warning:
symbol '_get_st_from_smid' was not declared. Should it be static?
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Fixes the following sparse warning:

drivers/scsi/hisi_sas/hisi_sas_main.c:1691:25: warning:
 symbol 'host_attrs' was not declared. Should it be static?
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Introduce a state enum into sdebug_defer objects to indicate which, if
any, defer method has been used with the associated command.  Also add 2
bools to indicate which of the defer methods has been initialized. Those
objects are re-used but the initialization only needs to be done
once. This simplifies command cancellation handling.

Now the delay associated with a deferred response of a command cannot be
changed (once started) by changing the delay (and ndelay) parameters in
sysfs. Command aborts and driver shutdown are still honoured immediately
when received.

[mkp: applied by hand]
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Reviewed-by: NBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This saves a little .text and gets rid of the unmotivated line break and
the sizeof(...) style inconsistency.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

No functional changes.

This patch is a re-work of DCMD refire code to better manage all the
different cases to decide whether to REFIRE or SKIP or COMPLETE certain
DCMD.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Expose FW outstanding commands (fw_outstanding) through sysfs interface.
This helps in debugging certain performance issues in the field.
Signed-off-by: NSasikumar Chandrasekaran <sasikumar.pc@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Performance improvement:

Current driver calls stream detection unconditionally for all IOs.
Stream Detection logic is not required for most of the fast path IO. To
improve performance, avoid stream detection logic and do it only if
required.

Below are the cases where stream detection is required in driver:

1. All non-FastPath IOs (IOs going to FW)
2. Fast Path reads sent to ReadAhead capable VDs.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Issue – There may be some IO accessing incorrect raid map, but driver
has checks in IO path to handle those cases. It is always better to move
to new raid map only once raid map is populated and validated.  No
functional defect. Fix is provided as part of review.  Fix – Update
instance->map_id after driver has populated new driver raid map from
firmware raid map.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

scsi: megaraid_sas: Use megasas_wait_for_adapter_operational to detect controller state in IOCTL path

In IOCTL path, re-use megasas_wait_for_adapter_operational API to detect
controller state. This will make driver to use this API uniformly in all
cases where we need to wait for adapter to become operational.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Driver needs to avoid PCI writes while OCR is in progress.  Use
reset_mutex to synchronize between firing DCMDs MR_DCMD_PD_GET_INFO and
MR_DCMD_DRV_GET_TARGET_PROP while OCR is triggered.  Without this fix,
if Device/VD add/creation is in progress and at the same time MR
Firmware is going through OCR, user may see OCR never completed and it
may need system reboot.  This scenario is rare to occur. Fix is provided
as part of review.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Issue - Driver returns DID_NO_CONNECT when unload is in progress,
indicated using instance->unload flag. In case of dynamic unload of
driver, this flag is set before calling scsi_remove_host(). While doing
manual driver unload, user will see lots of prints for Sync Cache
command with DID_NO_CONNECT status.

Fix - Set the instance->unload flag after scsi_remove_host(). Allow
device removal process to be completed and do not block any command
before that.  SCSI commands (like SYNC_CACHE) are received (as part of
scsi_remove_host) by driver during unload will be submitted further down
to the drives.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Currently driver does not validate ldcount provided by firmware.  If the
value is invalid, fail RAID map validation accordingly.  This issue is
rare to hit in field and is fixed as part of code review.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

In megasas_get_seq_num, the status of the DCMD fired to FW is not
returned, it always returns success.  We could end up registering AEN
request with incorrect sequence number if the DCMD failed.  Return the
DCMD status back to caller.  This was discovered during code review and
very rare to see issue in field to see AEN request failed bt FW.
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Commit b9637d14 ("scsi: megaraid_sas: Resize MFA frame used for IOC
INIT to 4k") increased the size of IOC INIT frame to 4k.  Need to use
updated size when memsetting init_frame.
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Memory allocated for IOC_INIT command and stream detection array are not
zero'd before using. Use kzalloc instead of kmalloc to zero out the
memory allocated.
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NShivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch does not change any functionality but makes the SCSI core
source code slightly easier to read.
Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The delay for the rescan worker needs to 10 seconds, missed the HZ in
there.

Fixes: a1367e4a (scsi: aacraid: Reschedule host scan in case of failure)
Signed-off-by: NRaghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The correct lun count needs to be divided by 24, missed it in the
previous patch set.

Fixes: 4b000227 (scsi: aacraid: Create helper functions to get lun info)
Signed-off-by: NRaghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

For hardware only supporting active/optimized there's no point in ever
re-issuing RTPG as the only new state we can possibly read is
active/optimized.  This avoid spurious errors during path failover on
such arrays.
Signed-off-by: NHannes Reinecke <hare@suse.com>
Reviewed-by: NBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Use the ARRAY_SIZE macro on array __pciids to determine size of the
array.  Improvement suggested by coccinelle.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The initialization of d is redundant as this value is never read and it
is overwritten inside the subsequent for-loop.  Remove this redundant
assignment.

Cleans up clang warning:
drivers/scsi/qla2xxx/qla_gs.c:3985:29: warning: Value stored to 'd'
during its initialization is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Use dma_zalloc_coherent instead of dma_alloc_coherent followed by memset
0.

Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
Suggested-by: NLuis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: NHimanshu Jha <himanshujha199640@gmail.com>
Acked-by: NManish Rangankar <Manish.Rangankar@cavium.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Use dma_zalloc_coherent instead of dma_alloc_coherent followed by memset
0.

Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
Suggested-by: NLuis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: NHimanshu Jha <himanshujha199640@gmail.com>
Acked-by: NChad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

According to ATA protocol, SET MAX commands belong to different frame
types. So judge features field of SET MAX commands to decide which
frame type they belongs to.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

There are two other values for SET MAX feature field according to ata
protocol. So definite them.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Acked-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

If CONFIG_SCSI_SMARTPQI=y then don't build this driver as a module.
Signed-off-by: NSteffen Weber <steffen.weber@gmail.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add resp_write_scat() function to support decoding WRITE SCATTERED
(16 and 32). Also weave resp_write_scat() into the cdb decoding
logic.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Reviewer suggested using the ARRAY_SIZE macro. That reduced one of the subtle
inter-dependencies in the parser's tables.

It is important that commands which simulate media access, indicate this in the
flags for that command. The flag to do that was FF_DIRECT_IO. On reflection
FF_MEDIA_IO seems a more accurate description.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Reviewed-by: NBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

WRITE SCATTERED needs to take several "bites" out of the data-out buffer.
Expand the do_device_access() function to take a sg_skip argument.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Reviewed-by: NBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Various cdb masks incorrectly assumed the GROUP NUMBER field
was 5 bits long. It is actually 6 bits long. Correct.
Also fix mask failure (in same byte) to allow DLD0 in READ(16)
and WRITE(16).
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Reviewed-by: NBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Some of my development tools tend to add spaces (my preference) rather
than tabs (kernel convention). Running unexpand to clean these spaces
up found more of them than checkpatch.pl did. Then checkpatch.pl
complained about other style violations in those newly tabbed lines.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Reviewed-by: NBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Performance improvement using block layer tag.

Curent driver gets scsiio tracker and free smid from link list and array
based tracking managed by driver.  Accessing list in main io path is
performance pentaly because of protection using spinlock
"scsi_lookup_lock".

In this patch:

1. Driver removes all link list access from main io path and
   use scmd->request->tag to get free smid.

2. Instead of holding 'struct scsiio_tracker' in its own pool
   driver can embed it into the scsi command.

Driver provides cmd_size in scsi_host_template, so that struct
scsiio_tracker is preallocated by scsi mid layer for each scsi command.
Signed-off-by: NHannes Reinecke <hare@suse.com>
Signed-off-by: NSuganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Use 'host_busy' instead of counting outstanding commands by hand.
Signed-off-by: NHannes Reinecke <hare@suse.com>
Signed-off-by: NSuganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>