[PATCH 0/6] crypto: qat - add sysfs PCI reset support for QAT devices

[Ahsan Atta <ahsan.atta@intel.com>]

A PCI reset triggered through sysfs (/sys/bus/pci/devices/.../reset)
leaves QAT devices in an unusable state because the driver has never
implemented the reset_prepare() and reset_done() callbacks. The reset
proceeds without quiescing the device or restoring it afterward. This
series adds the missing sysfs reset support and fixes the deadlocks,
state-management issues, and corner cases that surface when the reset
path is actually exercised.

Note on stable backport:
Since this support was entirely absent rather than broken by a specific
commit, there is no individual Fixes tag that can be cited. We believe
this series warrants inclusion in stable to allow users to perform
standard PCI resets on QAT devices without rendering them
non-functional. We will need to revisit/retest when doing the backport
as the PCI core may have changed.

In summary:
Patch #1: Skip VF disable and enable during device restart when the VF
topology is already present. This avoids lock-order issues in PCI
reset callbacks while keeping VF quiesce notification intact.

Patch #2: Move fatal error notification earlier in the AER path. This
ensures subsystems and VFs are informed as soon as fatal error handling
begins.

Patch #3: Centralize PCI bus-master enable into a single init path.
Remove scattered pci_set_master()/pci_clear_master() calls so BME
state is deterministic across reset flows.

Patch #4: Skip the shutdown and restart flow for devices that were
already administratively down before PCI reset. PCI state is still
restored, but the device remains down as expected.

Patch #5: Factor the common AER shutdown and recovery sequences into
reset_prepare() and reset_done() helpers to simplify the reset path
and prepare it for reuse.

Patch #6: Hook reset_prepare() and reset_done() into the QAT PCI error
handler. This makes sysfs-triggered PCI reset follow the same quiesce
and recovery flow as AER reset.

Ahsan Atta (6):
  crypto: qat - keep VFs enabled during reset
  crypto: qat - notify fatal error before AER reset preparation
  crypto: qat - centralize bus master enable
  crypto: qat - skip restart for down devices
  crypto: qat - factor out AER reset helpers
  crypto: qat - handle sysfs-triggered reset callbacks

 drivers/crypto/intel/qat/qat_420xx/adf_drv.c  |   2 -
 drivers/crypto/intel/qat/qat_4xxx/adf_drv.c   |   2 -
 drivers/crypto/intel/qat/qat_6xxx/adf_drv.c   |   2 -
 drivers/crypto/intel/qat/qat_c3xxx/adf_drv.c  |   1 -
 .../crypto/intel/qat/qat_c3xxxvf/adf_drv.c    |   1 -
 drivers/crypto/intel/qat/qat_c62x/adf_drv.c   |   1 -
 drivers/crypto/intel/qat/qat_c62xvf/adf_drv.c |   1 -
 drivers/crypto/intel/qat/qat_common/adf_aer.c | 102 +++++++++++++-----
 .../intel/qat/qat_common/adf_common_drv.h     |   1 +
 .../crypto/intel/qat/qat_common/adf_init.c    |   2 +
 .../crypto/intel/qat/qat_common/adf_sriov.c   |  12 ++-
 .../crypto/intel/qat/qat_dh895xcc/adf_drv.c   |   1 -
 .../crypto/intel/qat/qat_dh895xccvf/adf_drv.c |   1 -
 13 files changed, 87 insertions(+), 42 deletions(-)


base-commit: 6a69430dcc874c47fe5a25b70d87861c1cc9c0d8
-- 
2.45.0

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