crypto: qat - fix device reset flow

When the device needs a reset, e.g. when an uncorrectable PCIe AER event
occurs, various services/data structures need to be cleaned up, the
hardware reset and the services/data structures initialized and started.
The code to perform the cleanup and initialization was not performed when
a device reset was done.

This patch moves some of the initialization code out of the .probe entry-
point into a separate function that is now called during probe as well as
after the hardware has been reset.  Similarly, a new function is added for
first cleaning up these services/data structures prior to resetting.  The
new functions are adf_dev_init() and adf_dev_shutdown(), respectively, for
which there are already prototypes but no actual functions just yet and are
now called when the device is reset and during probe/cleanup of the driver.
The down and up flows via ioctl calls has similarly been updated.

In addition, there are two other bugs in the reset flow - one in the logic
for determining whether to schedule a device reset upon receiving an
uncorrectable AER event which prevents the reset flow from being initiated,
and another with clearing the status bit indicating a device is configured
(when resetting the device the configuration remains across the reset so
the bit should not be cleared, otherwise, the necessary services will not
be re-started in adf_dev_start() after the reset - clear the bit only when
actually deleting the configuration).

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/crypto/qat/qat_common/adf_ctl_drv.c b/drivers/crypto/qat/qat_common/adf_ctl_drv.c
index 7ee93f881db6..74207a6f0516 100644
--- a/drivers/crypto/qat/qat_common/adf_ctl_drv.c
+++ b/drivers/crypto/qat/qat_common/adf_ctl_drv.c
@@ -282,6 +282,8 @@ static int adf_ctl_stop_devices(uint32_t id)
 			if (adf_dev_stop(accel_dev)) {
 				pr_err("QAT: Failed to stop qat_dev%d\n", id);
 				ret = -EFAULT;
+			} else {
+				adf_dev_shutdown(accel_dev);
 			}
 		}
 	}
@@ -343,7 +345,9 @@ static int adf_ctl_ioctl_dev_start(struct file *fp, unsigned int cmd,
 	if (!adf_dev_started(accel_dev)) {
 		pr_info("QAT: Starting acceleration device qat_dev%d.\n",
 			ctl_data->device_id);
-		ret = adf_dev_start(accel_dev);
+		ret = adf_dev_init(accel_dev);
+		if (!ret)
+			ret = adf_dev_start(accel_dev);
 	} else {
 		pr_info("QAT: Acceleration device qat_dev%d already started.\n",
 			ctl_data->device_id);
@@ -351,6 +355,7 @@ static int adf_ctl_ioctl_dev_start(struct file *fp, unsigned int cmd,
 	if (ret) {
 		pr_err("QAT: Failed to start qat_dev%d\n", ctl_data->device_id);
 		adf_dev_stop(accel_dev);
+		adf_dev_shutdown(accel_dev);
 	}
 out:
 	kfree(ctl_data);