[PATCH v5 0/7] libsas and drivers: NCQ error handling

[John Garry <john.garry@huawei.com>]

As reported in [0], the pm8001 driver NCQ error handling more or less
duplicates what libata does in link error handling, as follows:
- abort all commands
- do autopsy with read log ext 10 command
- reset the target to recover, if necessary

Indeed for the hisi_sas driver we want to add similar handling for NCQ
errors.

This series add a new libsas API - sas_ata_device_link_abort() - to handle
host NCQ errors, and fixes up pm8001 and hisi_sas drivers to use it.

A difference in the pm8001 driver NCQ error handling is that we send
SATA_ABORT per-task prior to read log ext10, but I feel that this should
not make a difference to the error handling.

Damien kindly tested previous the series for pm8001, but any further pm8001
testing would be appreciated as I have since tweaked pm8001 handling again.
This is because the pm8001 driver hangs on my arm64 machine read log ext10
command.

Finally with these changes we can make the libsas task alloc/free APIs
private, which they should always have been.

Based on mkp-scsi @ 6.1/scsi-staging 57569c37f0ad ("scsi: iscsi:
iscsi_tcp: Fix null-ptr-deref while calling getpeername()")

[0] https://lore.kernel.org/linux-scsi/8fb3b093-55f0-1fab-81f4-e8519810a978@huawei.com/

Changes since v4:
- Add Jason's tags (thanks)
- Rebase

Changes since v3:
- Add Damien's tags (thanks)
- Modify hisi_sas processing as follows:
  - use sas_task_abort() for rejected IO
  - Modify abort task processing to issue softreset in certain circumstances
- rebase

Changes since v2:
- Stop sending SATA_ABORT all for pm8001 handling
- Make "reset" optional in sas_ata_device_link_abort()
- Drop Jack's ACK

John Garry (5):
  scsi: libsas: Add sas_ata_device_link_abort()
  scsi: hisi_sas: Move slot variable definition in hisi_sas_abort_task()
  scsi: pm8001: Modify task abort handling for SATA task
  scsi: pm8001: Use sas_ata_device_link_abort() to handle NCQ errors
  scsi: libsas: Make sas_{alloc, alloc_slow, free}_task() private

Xingui Yang (2):
  scsi: hisi_sas: Add SATA_DISK_ERR bit handling for v3 hw
  scsi: hisi_sas: Modify v3 HW SATA disk error state completion
    processing

 drivers/scsi/hisi_sas/hisi_sas.h       |   1 +
 drivers/scsi/hisi_sas/hisi_sas_main.c  |  26 +++-
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c |  53 ++++++-
 drivers/scsi/libsas/sas_ata.c          |  12 ++
 drivers/scsi/libsas/sas_init.c         |   3 -
 drivers/scsi/libsas/sas_internal.h     |   4 +
 drivers/scsi/pm8001/pm8001_hwi.c       | 186 ++++---------------------
 drivers/scsi/pm8001/pm8001_sas.c       |   8 ++
 drivers/scsi/pm8001/pm8001_sas.h       |   4 -
 drivers/scsi/pm8001/pm80xx_hwi.c       | 177 +++--------------------
 include/scsi/libsas.h                  |   4 -
 include/scsi/sas_ata.h                 |   6 +
 12 files changed, 143 insertions(+), 341 deletions(-)

-- 
2.35.3