scsi: mpi3mr: Update driver version to 8.5.1.0.0

Update driver version to 8.5.1.0.0

Signed-off-by: Chandrakanth patil <chandrakanth.patil@broadcom.com>
Link: https://lore.kernel.org/r/20231205191630.12201-5-chandrakanth.patil@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Support for preallocation of SGL BSG data buffers part-3

The driver acquires the required NVMe SGLs from the pre-allocated
pool.

Co-developed-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Chandrakanth patil <chandrakanth.patil@broadcom.com>
Link: https://lore.kernel.org/r/20231205191630.12201-4-chandrakanth.patil@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Support for preallocation of SGL BSG data buffers part-2

The driver acquires the required SGLs from the pre-allocated pool.

Co-developed-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Chandrakanth patil <chandrakanth.patil@broadcom.com>
Link: https://lore.kernel.org/r/20231205191630.12201-3-chandrakanth.patil@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Support for preallocation of SGL BSG data buffers part-1

The driver now supports SGLs for BSG data transfer. Upon loading, the
driver pre-allocates SGLs in chunks of 8k, results in a total of 256 * 8k,
equal to 2MB. These pre-allocated SGLs are reserved for handling BSG
commands and are deallocated during driver unload.

Co-developed-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Chandrakanth patil <chandrakanth.patil@broadcom.com>
Link: https://lore.kernel.org/r/20231205191630.12201-2-chandrakanth.patil@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: driver version upgrade to 8.5.0.0.50

Update driver version to 8.5.0.0.50.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Link: https://lore.kernel.org/r/20231123160132.4155-6-sumit.saxena@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Increase maximum number of PHYs to 64 from 32

SAS5116 controllers supports maximum 48 physical PHYs. Modify driver to
accommodate up to 64 PHYs (though current need is to support 48 PHYs).

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Link: https://lore.kernel.org/r/20231123160132.4155-4-sumit.saxena@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Update driver version to 8.5.0.0.0

Update driver version to 8.5.0.0.0

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://lore.kernel.org/r/20230804104248.118924-7-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: WRITE SAME implementation

Enhance driver to divert the WRITE SAME commands that are issued with
UNMAP=1 and NDOB=1 and with the transfer length greater than the max WRITE
SAME length specified by the firmware for the particular drive to the
controller firmware.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307280034.DXU5pTVV-lkp@intel.com/
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://lore.kernel.org/r/20230804104248.118924-5-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for more than 1MB I/O

Enhance the driver to get the maximum data length per I/O request from IOC
Facts data and report that to the upper layers. If the IOC facts data is
not reported then a default I/O size of 1MB is reported to the OS.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://lore.kernel.org/r/20230804104248.118924-4-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Fix the type used for pointers to bitmap

Bitmaps are "unsigned long[]", so better use "unsigned long *" instead of a
plain "void *" when dealing with pointers to bitmaps.

This is more informative.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/8bdf9148ce1a5d01aac11c46c8617b477813457e.1683473011.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Update driver version to 8.4.1.0.0

Update driver version to 8.4.1.0.0.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Link: https://lore.kernel.org/r/20230316110209.60145-9-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Update copyright year

Update copyright year from 2022 to 2023.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Link: https://lore.kernel.org/r/20230316110209.60145-8-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Modify MUR timeout value to 120 seconds

Modify Message Unit Reset timeout value to 120 seconds from the previous
value of 30 seconds.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Signed-off-by: Sreekant Reddy <sreekanth.reddy@broadcom.com>
Link: https://lore.kernel.org/r/20230316110209.60145-4-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Successive VD delete and add causes FW fault

Upon Virtual disk removal, firmware sends device status change event
(Virtual disk remove event) and expects the driver to start device remove
handshake (by sending target reset and IOU control command to firmware).
However, the driver does not initiate the device remove handshake which
leads to the firmware fault.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Link: https://lore.kernel.org/r/20230316110209.60145-2-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Fix expander node leak in mpi3mr_remove()

Add a missing resource clean up in .remove.

Fixes: e22bae30667a ("scsi: mpi3mr: Add expander devices to STL")
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Link: https://lore.kernel.org/r/20230302234336.25456-7-thenzl@redhat.com
Acked-by: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: ioctl timeout when disabling/enabling interrupt

As part of Task Management handling, the driver will disable and enable the
MSIx index zero which belongs to the Admin reply queue. During this
transition the driver loses some interrupts and this leads to Admin request
and ioctl timeouts.

After enabling the interrupts, poll the Admin reply queue to avoid
timeouts.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Link: https://lore.kernel.org/r/20230228140835.4075-2-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Remove unneeded version.h include

Remove unneeded version.h include pointed out by 'make versioncheck'.

Link: https://lore.kernel.org/r/820137c2-decc-3d78-f170-7f1c0571fbb7@gmail.com
Signed-off-by: Jesper Juhl <jesperjuhl76@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Use number of bits to manage bitmap sizes

To allocate bitmaps, the mpi3mr driver calculates sizes of bitmaps using
byte as unit. However, bitmap helper functions assume that bitmaps are
allocated using unsigned long as unit. This gap causes memory access beyond
the bitmap sizes and results in "BUG: KASAN: slab-out-of-bounds". The BUG
was observed at firmware download to eHBA-9600. Call trace indicated that
the out-of-bounds access happened in find_first_zero_bit() called from
mpi3mr_send_event_ack() for miroc->evtack_cmds_bitmap.

To fix the BUG, do not use bytes to manage bitmap sizes. Instead, use
number of bits, and call bitmap helper functions which take number of bits
as arguments. For memory allocation, call bitmap_zalloc() instead of
kzalloc() and krealloc(). For memory free, call bitmap_free() instead of
kfree(). For zero clear, call bitmap_clear() instead of memset().

Remove three fields for bitmap byte sizes in struct scmd_priv which are no
longer required. Replace the field dev_handle_bitmap_sz with
dev_handle_bitmap_bits to keep number of bits of removepend_bitmap across
resize.

Link: https://lore.kernel.org/r/20230214005019.1897251-4-shinichiro.kawasaki@wdc.com
Fixes: c5758fc72b92 ("scsi: mpi3mr: Gracefully handle online FW update operation")
Fixes: e844adb1fbdc ("scsi: mpi3mr: Implement SCSI error handler hooks")
Fixes: c1af985d27da ("scsi: mpi3mr: Add Event acknowledgment logic")
Fixes: 824a156633df ("scsi: mpi3mr: Base driver code")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Acked-by: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Update driver version to 8.2.0.3.0

Update driver version to 8.2.0.3.0.

Link: https://lore.kernel.org/r/20220912135742.11764-10-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Fix scheduling while atomic type bug

Fix 'scheduling while atomic' type bug, which is observed when
pci_irq_vector() is called from interrupt context.

Link: https://lore.kernel.org/r/20220912135742.11764-9-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Scan the devices during resume time

Scan the target devices during system resume time and add or remove the
target device with the SML if the corresponding target device is newly
added or removed respectively.

Link: https://lore.kernel.org/r/20220912135742.11764-8-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Free enclosure objects during driver unload

Free the enclosure device objects during driver unload and before
rescanning the target devices during controller reset.

Link: https://lore.kernel.org/r/20220912135742.11764-7-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Graceful handling of surprise removal of PCIe HBA

Implement graceful handling of surprise or orderly removal of PCIe HBA:

- Detect a hot removal of the controller at certain critical places in the
driver. Early detection will help to reduce the time taken for cleaning
up the hot-removed controller at the driver level.

- Poll the status of the port enable issued after reset once every 5
seconds to avoid a long delay in detecting unavailable controller.

Link: https://lore.kernel.org/r/20220912135742.11764-5-sreekanth.reddy@broadcom.com
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Refresh SAS ports during soft reset

Update the host's SAS ports if there is change in port id or phys. If the
port id is changed, then the driver updates it. If some phys are
enabled/disabled during reset, then driver updates them in STL.

Check for the responding expander devices and update the device handle if
it got changed. Register the expander with STL if it got added during reset
and unregister the expander device if it got removed during reset.

[mkp: include fix for zeroday warning]

Link: https://lore.kernel.org/r/20220804131226.16653-15-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Support SAS transport class callbacks

Add support for the following SAS transport class callbacks:

- get_linkerrors
- get_enclosure_identifier
- get_bay_identifier
- phy_reset
- phy_enable
- set_phy_speed
- smp_handler

Link: https://lore.kernel.org/r/20220804131226.16653-14-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add framework to issue MPT transport cmds

Add framework to issue MPT transport commands to controllers. Also issue
the MPT transport commands to get the manufacturing info of SAS expander
device.

Link: https://lore.kernel.org/r/20220804131226.16653-13-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add SAS SATA end devices to STL

Register/unregister the SAS, SATA devices to SCSI Transport Layer(STL)
whenever the corresponding device is added/removed from topology.

Link: https://lore.kernel.org/r/20220804131226.16653-12-sreekanth.reddy@broadcom.com
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Get target object based on rphy

When device is registered with the STL then get the corresponding device's
target object using the rphy in below callback functions:

- mpi3mr_target_alloc()

- mpi3mr_slave_alloc()

- mpi3mr_slave_configure()

- mpi3mr_slave_destroy()

Link: https://lore.kernel.org/r/20220804131226.16653-11-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add expander devices to STL

Register/unregister the expander devices to SCSI Transport Layer(STL)
whenever the corresponding expander is added/removed from topology.

Link: https://lore.kernel.org/r/20220804131226.16653-10-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Enable STL on HBAs where multipath is disabled

Register the SAS, SATA devices to SCSI Transport Layer (STL) only if
multipath capability is disabled in the controller's firmware.

Link: https://lore.kernel.org/r/20220804131226.16653-9-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add helper functions to manage device's port

Add the following helper functions:

- Update the host phys with STL

- Remove the device's SAS port with STL

Link: https://lore.kernel.org/r/20220804131226.16653-8-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add helper functions to retrieve device objects

Add the following helper functions:

- Get the device's sas address by reading corresponding device's Device
page0

- Get the expander object from expander list based on expander's handle

- Get the target device object from target device list based on device's
sas address

- Get the expander device object from expander list based on expanders's
sas address

- Get hba port object from hba port table list based on port's port id

Link: https://lore.kernel.org/r/20220804131226.16653-7-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add framework to add phys to STL

Add framework to register and unregister the host and expander phys with
SCSI Transport Layer (STL).

Link: https://lore.kernel.org/r/20220804131226.16653-6-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Enable Enclosure device add event

Enable and process the Enclosure device add event.

Link: https://lore.kernel.org/r/20220804131226.16653-5-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add helper functions to retrieve config pages

Add helper functions to retrieve below controller's config pages:

- SAS IOUnit Page0

- SAS IOUnit Page1

- Driver Page1

- Device Page0

- SAS Phy Page0

- SAS Phy Page1

- SAS Expander Page0

- SAS Expander Page1

- Enclosure Page0

Also add the helper function to set SAS IOUnit Page1.

Link: https://lore.kernel.org/r/20220804131226.16653-4-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add framework to issue config requests

Add framework to issue config requests commands to controller firmware.

Link: https://lore.kernel.org/r/20220804131226.16653-3-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Reduce VD queue depth on detecting throttling

Reduce the VD queue depth on detecting the throttling condition.

[mkp: incorporate fix for pointer cast issue reported by the test
robot and Guenter Roeck]

Link: https://lore.kernel.org/r/20220708195020.8323-3-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Resource Based Metering

Update driver to track cumulative pending large data size at the controller
level and at the throttle group level. When one of the values meet or
exceed the controller's firmware-determined high threshold value, then the
driver will divert future selective I/O to the firmware. Once both
controller level and at the throttle group level cumulative pending large
data size reach controller's firmware determined low threshold value, then
the driver will stop diverting I/Os to the firmware.

Link: https://lore.kernel.org/r/20220708195020.8323-2-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Increase cmd_per_lun to 128

Increase cmd_per_lun to 128.

Link: https://lore.kernel.org/r/20220628074848.5036-3-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Rework mrioc->bsg_device model to fix warnings

During driver unload, mrioc->bsg_device reference count becomes
negative. Also, as reported in [1], the driver's bsg_device model had few
more bugs. Fix all these up.

[1] https://marc.info/?l=linux-scsi&m=165183971411991&w=2

Link: https://lore.kernel.org/r/20220526170157.58274-1-sumit.saxena@broadcom.com
Fixes: 4268fa751365 ("scsi: mpi3mr: Add bsg device support")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Tested-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add target device related sysfs attributes

Add sysfs attributes for exposing target device details such as SAS
address, firmware device handle, and persistent ID for the
controller-attached devices and RAID volumes.

Link: https://lore.kernel.org/r/20220517115310.13062-3-sreekanth.reddy@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Increase I/O timeout value to 60s

Set each SCSI device's default I/O timeout and default error handling I/O
timeout to 60s.

Link: https://lore.kernel.org/r/20220505184808.24049-3-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Update driver version to 8.0.0.69.0

Link: https://lore.kernel.org/r/20220429211641.642010-9-sumit.saxena@broadcom.com
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for NVMe passthrough

Add support for management applications to send an MPI3 Encapsulated NVMe
passthru command to the NVMe devices attached to an Avenger controller.
Since the NVMe drives are exposed as SCSI devices by the controller, the
standard NVMe applications cannot be used to interact with the drives and
the command sets supported are also limited by the controller firmware.
Special handling is required for MPI3 Encapsulated NVMe passthru commands
for PRP/SGL setup in the commands.

Link: https://lore.kernel.org/r/20220429211641.642010-8-sumit.saxena@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Expose adapter state to sysfs

Link: https://lore.kernel.org/r/20220429211641.642010-7-sumit.saxena@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for PEL commands

Implement driver support for management applications to enable persistent
event log (PEL) notifications. Upon receipt of events, the driver will
increment a sysfs variable named event_counter. The management application
will poll for event_counter value changes and signal the application about
events.

Link: https://lore.kernel.org/r/20220429211641.642010-6-sumit.saxena@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for MPT commands

There are certain management commands which require firmware intervention.
These commands are termed MPT commands. Add support for them.

Link: https://lore.kernel.org/r/20220429211641.642010-5-sumit.saxena@broadcom.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Move data structures/definitions from MPI headers to uapi header

This patch moves the data structures/definitions which are used by
userspace applications from MPI headers to uapi/scsi/scsi_bsg_mpi3mr.h

Link: https://lore.kernel.org/r/20220429211641.642010-4-sumit.saxena@broadcom.com
Reported by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for driver commands

There are certain bsg commands which need to be completed by the driver
without involving firmware. These requests are termed driver commands. Add
support for these.

Link: https://lore.kernel.org/r/20220429211641.642010-3-sumit.saxena@broadcom.com
Reported by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add bsg device support

Create bsg device per controller for controller management purposes.

bsg device nodes will be named /dev/bsg/mpi3mrctl0, /dev/bsg/mpi3mrctl1,
etc.

Link: https://lore.kernel.org/r/20220429211641.642010-2-sumit.saxena@broadcom.com
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

treewide: Replace zero-length arrays with flexible-array members

There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

This code was transformed with the help of Coccinelle:
(next-20220214$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)

@@
identifier S, member, array;
type T1, T2;
@@

struct S {
...
T1 member;
T2 array[
- 0
];
};

UAPI and wireless changes were intentionally excluded from this patch
and will be sent out separately.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

scsi: mpi3mr: Bump driver version to 8.0.0.68.0

Bump mpi3mr driver version to 8.0.0.68.0.

Link: https://lore.kernel.org/r/20220210095817.22828-10-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Update the copyright year

Update the copyright year to 2017-2022.

Link: https://lore.kernel.org/r/20220210095817.22828-8-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Fix deadlock while canceling the fw event

During controller reset, the driver tries to flush all the pending firmware
event works from worker queue that are queued prior to the reset. However,
if any work is waiting for device addition/removal operation to be
completed at the SML, then a deadlock is observed. This is due to the
controller reset waiting for the device addition/removal to be completed
and the device/addition removal is waiting for the controller reset to be
completed.

To limit this deadlock, continue with the controller reset handling without
canceling the work which is waiting for device addition/removal operation
to complete at SML.

Link: https://lore.kernel.org/r/20220210095817.22828-2-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Bump driver version to 8.0.0.61.0

Update the driver version to newer version format i.e. 8.0.0.61.0.

Link: https://lore.kernel.org/r/20211220141159.16117-26-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Fixes around reply request queues

Set reply queue depth of 1K for B0 and 4K for A0.

While freeing the segmented request queues use the actual queue depth that
is used while creating them.

Link: https://lore.kernel.org/r/20211220141159.16117-25-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Enhanced Task Management Support Reply handling

Enhance driver to consider MPI3_IOCSTATUS_SCSI_IOC_TERMINATED as a success
for TMs issued by it and check the pending I/Os to decide the success or
failure of the task management requests instead of just considering the
MPI3_IOCSTATUS_SCSI_IOC_TERMINATED as a failure of the task management
request.

Link: https://lore.kernel.org/r/20211220141159.16117-24-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Use TM response codes from MPI3 headers

Remove locally defined TM response codes and use codes from MPI3 headers.

Link: https://lore.kernel.org/r/20211220141159.16117-23-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add io_uring interface support in I/O-polled mode

Add support for the io_uring interface in I/O-polled mode.

This feature is disabled in the driver by default. To enable the feature, a
module parameter "poll_queues" has to be set with the desired number of
polling queues.

When the feature is enabled, the driver reserves a certain number of
operational queue pairs for the poll_queues either from the available queue
pairs or creates additional queue pairs based on the operational queue
availability.

The Polling queues will have corresponding IRQ and ISR functions as similar
to default queues. However, the IRQ line is disabled by the driver for
poll_queues.

Link: https://lore.kernel.org/r/20211220141159.16117-22-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Support Prepare for Reset event

The IOC sends a Prepare for Reset Event to the host to prepare for a Soft
Reset. This event data has two reason codes:

1. Start - The host is expected to gracefully quiesce all I/O within
approximately 1 second.

2. Abort - The IOC is requesting to abort a previous Prepare for Reset
Event request. Normal I/O may be resumed.

Link: https://lore.kernel.org/r/20211220141159.16117-20-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add Event acknowledgment logic

Add Event acknowledgment logic.

Link: https://lore.kernel.org/r/20211220141159.16117-19-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Gracefully handle online FW update operation

Enhance driver to gracefully handle discrepancies in certain key data sizes
between firmware update operations as mentioned below:

- The driver displays an error message and marks the controller as
unrecoverable if the firmware reports ReplyFrameSize that is greater
than the current ReplyFrameSize.

- If the firmware reports ReplyFrameSize greater than the current
ReplyFrameSize then the driver uses the current ReplyFrameSize while
copying the reply messages.

- The driver displays an error message and marks the controller as
unrecoverable if the firmware reports MaxOperationalReplyQueues less
than the currently allocated operational reply queues count.

- If the firmware reports MaxOperationalReplyQueues that is greater than
the currently allocated operational reply queue count then the driver
ignores the new increased value and uses the previously allocated number
of operational queues only.

- If the firmware reports MaxDevHandle greater than the previously used
MaxDevHandle value after a reset then the driver re-allocates the
'device remove pending bitmap' buffer with the newer size using
krealloc().

Link: https://lore.kernel.org/r/20211220141159.16117-18-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Detect async reset that occurred in firmware

Detect asynchronous reset that occurred in the firmware by polling for
reset history bit of IOC status register is set and if that bit is set,
then the driver waits for the controller to become ready and then
re-initializes the controller.

Also reduce the time driver is waiting for the controller to acknowledge
the reset action after issuing a specific reset action to the
controller. The wait time is reduced from 510 seconds to 30 seconds. If the
controller didn't acknowledge a specific reset action within the time
interval then the driver marks the controller as unrecoverable instead of
retrying two more times prior to giving up.

Link: https://lore.kernel.org/r/20211220141159.16117-17-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Handle offline FW activation in graceful manner

Currently the driver marks the controller as unrecoverable if there is an
asynchronous reset or fault during the initialization, reinitialization
post reset, and OS resume.

Enhance driver to retry the initialization, re-initialization, and resume
sequences for a maximum of 3 times if the controller became faulty or
asynchronously reset due to a firmware activation during the initialization
sequence.

Link: https://lore.kernel.org/r/20211220141159.16117-15-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Fault IOC when internal command gets timeout

Save snapdump and fault the controller with the given reason code if it is
already not in the fault or not in asynchronous reset. This ensures that
soft reset is issued from the watchdog thread. This will also be used to
handle initialization time faults/resets/timeout as in those cases
immediate soft reset invocation is not required.

Link: https://lore.kernel.org/r/20211220141159.16117-12-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Increase internal cmnds timeout to 60s

- Increase internal command timeout to 60 seconds.

- Enable 16 device removal handshake processing in parallel in the device
removal handshake infrastructure.

Link: https://lore.kernel.org/r/20211220141159.16117-9-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for PCIe Managed Switch SES device

The SAS4 Controller firmware exposes the SES devices in Managed PCIe Switch
as a PCIe Device Type SCSI Device
(MPI3_DEVICE0_PCIE_DEVICE_INFO_TYPE_SCSI_DEVICE).

Driver is enhanced to handle this device type by:

- Exposing the device to the upper layers and

- Not updating any hardware sectors & virtual boundary settings as these
settings are needed only for NVMe devices.

Link: https://lore.kernel.org/r/20211220141159.16117-7-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Update MPI3 headers - part2

Continued updating MPI3 headers.

Link: https://lore.kernel.org/r/20211220141159.16117-6-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Set up IRQs in resume path

Driver is not setting up IRQs in the resume path. As a result, hibernation
path is broken and controller will not be operational after system is
resumed.

Set up IRQs to handle the hibernation case.

Link: https://lore.kernel.org/r/20210818081755.1274470-1-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Cc: thenzl@redhat.com
Reported-by: Marco Patalano <mpatalan@redhat.com>
Tested-by: Marco Patalano <mpatalan@redhat.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Make some symbols static

Fix the following warnings:

drivers/scsi/mpi3mr/mpi3mr_os.c:24:5: warning: symbol 'prot_mask' was not declared. Should it be static?
drivers/scsi/mpi3mr/mpi3mr_os.c:28:5: warning: symbol 'prot_guard_mask' was not declared. Should it be static?
drivers/scsi/mpi3mr/mpi3mr_os.c:31:5: warning: symbol 'logging_level' was not declared. Should it be static?

Link: https://lore.kernel.org/r/20210604071407.1360742-1-yangyingliang@huawei.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Acked-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add EEDP DIF DIX support

Link: https://lore.kernel.org/r/20210520152545.2710479-24-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for DSN secure firmware check

Read PCI_EXT_CAP_ID_DSN to query security status.

The driver will throw a warning message when a non-secure type controller
is detected. The purpose of this interface is to avoid interacting with any
firmware which is not secured/signed by Broadcom. Any tampering on
firmware component will be detected by hardware and it will be communicated
to the driver to avoid any further interaction with that component.

Link: https://lore.kernel.org/r/20210520152545.2710479-23-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Wait for pending I/O completions upon detection of VD I/O timeout

Wait for host I/O completion (default 180 seconds) if I/O timeout is
detected on VDs.

Link: https://lore.kernel.org/r/20210520152545.2710479-21-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Complete support for soft reset

Unlock the host diagnostic register, write the specific reset type to that
and wait for reset acknowledgment from the controller. If the reset is not
successful retry for the predefined number of times

Link: https://lore.kernel.org/r/20210520152545.2710479-19-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for threaded ISR

Register driver for threaded interrupts.

By default the driver will attempt I/O completion from interrupt context
(primary handler). Since the driver tracks per reply queue outstanding
I/Os, it will schedule threaded ISR if there are any outstanding I/Os
expected on that particular reply queue.

Threaded ISR (secondary handler) will loop for I/O completion as long as
there are outstanding I/Os (speculative method using same per reply queue
outstanding counter) or it has completed some X amount of commands
(something like budget).

Link: https://lore.kernel.org/r/20210520152545.2710479-18-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add change queue depth support

Link: https://lore.kernel.org/r/20210520152545.2710479-15-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Implement SCSI error handler hooks

Link: https://lore.kernel.org/r/20210520152545.2710479-14-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Cc: hare@suse.de
Cc: thenzl@redhat.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for timestamp sync with firmware

This operation requests that the IOC update the TimeStamp.

When the I/O Unit is powered on it sets the TimeStamp field value to
0x0000_0000_0000_0000 and increments the current value every millisecond.
A host driver sets the TimeStamp field to the current time by using an
IOCInit request. The TimeStamp field is periodically updated by the host
driver.

Link: https://lore.kernel.org/r/20210520152545.2710479-11-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for recovering controller

Detection of firmware fault or any kind of unresponsiveness in the
controller (any admin command which times out) results in resetting the
controller. The primary reset mechanisms used are either soft reset or diag
fault reset. A reset is performed if the host sets the ResetAction field in
the HostDiagnostic register to either 001b (soft reset) or 007b (diag fault
reset). After successfully resetting the controller the driver
reinitializes the controller by going through start of the day
initialization procedure. Pending I/Os during the reset are returned back
to the SCSI midlayer for retry.

Link: https://lore.kernel.org/r/20210520152545.2710479-10-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.co
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for device add/remove event handling

Firmware can report various MPI Events. Enable support for processing the
following events related to device addition/removal to the driver:

- MPI3_EVENT_DEVICE_ADDED
- MPI3_EVENT_DEVICE_INFO_CHANGED
- MPI3_EVENT_DEVICE_STATUS_CHANGE
- MPI3_EVENT_ENCL_DEVICE_STATUS_CHANGE
- MPI3_EVENT_SAS_TOPOLOGY_CHANGE_LIST
- MPI3_EVENT_SAS_DISCOVERY
- MPI3_EVENT_SAS_DEVICE_DISCOVERY_ERROR

Link: https://lore.kernel.org/r/20210520152545.2710479-7-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for internal watchdog thread

The watchdog thread is the driver's internal thread which does a few things
such as detecting firmware faults, resetting the controller, performing
timestamp sync, etc.

Link: https://lore.kernel.org/r/20210520152545.2710479-6-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Add support for queue command processing

Send Port Enable Request to FW for Device Discovery. As part of port
enable completion driver calls scan_start and scan_finished hooks. SCSI
layer references like sdev, starget, etc. are added but actual device
discovery will be supported once driver adds complete event process
handling.

Link: https://lore.kernel.org/r/20210520152545.2710479-5-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Cc: hare@suse.de
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Create operational request and reply queue pair

Create operational request and reply queue pair.

The MPI3 transport interface consists of an Administrative Request Queue,
an Administrative Reply Queue, and Operational Messaging Queues. The
Operational Messaging Queues are the primary communication mechanism
between the host and the I/O Controller (IOC). Request messages, allocated
in host memory, identify I/O operations to be performed by the IOC. These
operations are queued on an Operational Request Queue by the host driver.
Reply descriptors track I/O operations as they complete. The IOC queues
these completions in an Operational Reply Queue.

To fulfil large contiguous memory requirement, driver creates multiple
segments and provide the list of segments. Each segment size should be 4K
which is a hardware requirement. An element array is contiguous or
segmented. A contiguous element array is located in contiguous physical
memory. A contiguous element array must be aligned on an element size
boundary. An element's physical address within the array may be directly
calculated from the base address, the Producer/Consumer index, and the
element size.

Expected phased identifier bit is used to find out valid entry on reply
queue. Driver sets <ephase> bit and IOC inverts the value of this bit on
each pass.

Link: https://lore.kernel.org/r/20210520152545.2710479-4-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

scsi: mpi3mr: Base driver code

Implement basic pci device driver requirements: Device probing, memory
allocation, mapping system registers, allocate irq lines, etc.

Source is managed in mainly three different files:

- mpi3mr_fw.c: Common code which interacts with underlying fw/hw.

- mpi3mr_os.c: Common code which interacts with SCSI midlayer.

- mpi3mr_app.c: Common code which interacts with application/ioctl.
This is currently work in progress.

Link: https://lore.kernel.org/r/20210520152545.2710479-3-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Cc: bvanassche@acm.org
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>