[PATCH 6.6.y] crypto: qat - add shutdown handler to qat_dh895xcc

[Sasha Levin <sashal@kernel.org>]

From: Giovanni Cabiddu <giovanni.cabiddu@intel.com>

[ Upstream commit 2c4e8b228733bfbcaf49408fdf94d220f6eb78fc ]

During a warm reset via kexec, the system bypasses the driver removal
sequence, meaning that the remove() callback is not invoked.
If a QAT device is not shutdown properly, the device driver will fail to
load in a newly rebooted kernel.

This might result in output like the following after the kexec reboot:

    QAT: AE0 is inactive!!
    QAT: failed to get device out of reset
    dh895xcc 0000:3f:00.0: qat_hal_clr_reset error
    dh895xcc 0000:3f:00.0: Failed to init the AEs
    dh895xcc 0000:3f:00.0: Failed to initialise Acceleration Engine
    dh895xcc 0000:3f:00.0: Resetting device qat_dev0
    dh895xcc 0000:3f:00.0: probe with driver dh895xcc failed with error -14

Implement the shutdown() handler that hooks into the reboot notifier
list. This brings down the QAT device and ensures it is shut down
properly.

Cc: <stable@vger.kernel.org>
Fixes: 7afa232e76ce ("crypto: qat - Intel(R) QAT DH895xcc accelerator")
Reviewed-by: Ahsan Atta <ahsan.atta@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
[ added false parameter to adf_dev_down() call ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/crypto/intel/qat/qat_dh895xcc/adf_drv.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/crypto/intel/qat/qat_dh895xcc/adf_drv.c b/drivers/crypto/intel/qat/qat_dh895xcc/adf_drv.c
index 1e748e8ce12d5..b68903212b640 100644
--- a/drivers/crypto/intel/qat/qat_dh895xcc/adf_drv.c
+++ b/drivers/crypto/intel/qat/qat_dh895xcc/adf_drv.c
@@ -27,12 +27,14 @@ MODULE_DEVICE_TABLE(pci, adf_pci_tbl);
 
 static int adf_probe(struct pci_dev *dev, const struct pci_device_id *ent);
 static void adf_remove(struct pci_dev *dev);
+static void adf_shutdown(struct pci_dev *dev);
 
 static struct pci_driver adf_driver = {
 	.id_table = adf_pci_tbl,
 	.name = ADF_DH895XCC_DEVICE_NAME,
 	.probe = adf_probe,
 	.remove = adf_remove,
+	.shutdown = adf_shutdown,
 	.sriov_configure = adf_sriov_configure,
 	.err_handler = &adf_err_handler,
 };
@@ -227,6 +229,13 @@ static void adf_remove(struct pci_dev *pdev)
 	kfree(accel_dev);
 }
 
+static void adf_shutdown(struct pci_dev *pdev)
+{
+	struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
+
+	adf_dev_down(accel_dev, false);
+}
+
 static int __init adfdrv_init(void)
 {
 	request_module("intel_qat");
-- 
2.39.5