crypto: qat - add shutdown handler to qat_c62x

JIRA: https://issues.redhat.com/browse/RHEL-72768
JIRA: https://issues.redhat.com/browse/RHEL-84366
Upstream Status: merged into herbert/crypto-2.6.git

commit a9a6e92
Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Date:   Wed Mar 26 15:59:51 2025 +0000

    crypto: qat - add shutdown handler to qat_c62x

    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
        c6xx 0000:3f:00.0: qat_hal_clr_reset error
        c6xx 0000:3f:00.0: Failed to init the AEs
        c6xx 0000:3f:00.0: Failed to initialise Acceleration Engine
        c6xx 0000:3f:00.0: Resetting device qat_dev0
        c6xx 0000:3f:00.0: probe with driver c6xx 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: a6dabee ("crypto: qat - add support for c62x accel type")
    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>

Signed-off-by: Vladis Dronov <vdronov@redhat.com>

Author: nefigtut

drivers/crypto/intel/qat/qat_c62x/adf_drv.c

@@ -209,6 +209,13 @@ 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);
+}
+
 static const struct pci_device_id adf_pci_tbl[] = {
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QAT_C62X) },
 	{ }
@@ -220,6 +227,7 @@ static struct pci_driver adf_driver = {
 	.name = ADF_C62X_DEVICE_NAME,
 	.probe = adf_probe,
 	.remove = adf_remove,
+	.shutdown = adf_shutdown,
 	.sriov_configure = adf_sriov_configure,
 	.err_handler = &adf_err_handler,
 };