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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Enable and process the Enclosure device add event.

Link: https://lore.kernel.org/r/20220804131226.16653-5-sreekanth.reddy@broadcom.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add framework to issue config requests commands to controller firmware.

Link: https://lore.kernel.org/r/20220804131226.16653-3-sreekanth.reddy@broadcom.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Increase cmd_per_lun to 128.

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

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: 4268fa75 ("scsi: mpi3mr: Add bsg device support")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Tested-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Link: https://lore.kernel.org/r/20220429211641.642010-7-sumit.saxena@broadcom.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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: Nkernel test robot <lkp@intel.com>
Reviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comReported-by: Nkernel test robot <lkp@intel.com>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Reviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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/78Reviewed-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NGustavo A. R. Silva <gustavoars@kernel.org>

Bump mpi3mr driver version to 8.0.0.68.0.

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

Update the copyright year to 2017-2022.

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

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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

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

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add Event acknowledgment logic.

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

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

 - 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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

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.comSigned-off-by: NSreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Continued updating MPI3 headers.

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