crypto: qat - add sysfs PCI reset support for QAT devices

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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