scsi: qedi: Add support for handling PCIe errors

The error recovery is handled by management firmware (MFW) with the help of
qed/qedi drivers. Upon detecting errors, driver informs MFW about this
event which in turn starts a recovery process. MFW sends ERROR_RECOVERY
notification to the driver which performs the required cleanup/recovery
from the driver side.

Link: https://lore.kernel.org/r/20200908095657.26821-9-mrangankar@marvell.com
Signed-off-by: Manish Rangankar <mrangankar@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
index 8fde35f843f767e889d3da1c1aa00e207d92eb2b..642790b2d9be5a25cfc6d2b238df6f65cf4fdad0 100644 (file)
--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -2390,6 +2390,25 @@ kset_free:
        return -ENOMEM;
 }
 
+static pci_ers_result_t qedi_io_error_detected(struct pci_dev *pdev,
+                                              pci_channel_state_t state)
+{
+       struct qedi_ctx *qedi = pci_get_drvdata(pdev);
+
+       QEDI_ERR(&qedi->dbg_ctx, "%s: PCI error detected [%d]\n",
+                __func__, state);
+
+       if (test_and_set_bit(QEDI_IN_RECOVERY, &qedi->flags)) {
+               QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_INFO,
+                         "Recovery already in progress.\n");
+               return PCI_ERS_RESULT_NONE;
+       }
+
+       qedi_ops->common->recovery_process(qedi->cdev);
+
+       return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
 static void __qedi_remove(struct pci_dev *pdev, int mode)
 {
        struct qedi_ctx *qedi = pci_get_drvdata(pdev);
@@ -2819,12 +2838,17 @@ MODULE_DEVICE_TABLE(pci, qedi_pci_tbl);
 
 static enum cpuhp_state qedi_cpuhp_state;
 
+static struct pci_error_handlers qedi_err_handler = {
+       .error_detected = qedi_io_error_detected,
+};
+
 static struct pci_driver qedi_pci_driver = {
        .name = QEDI_MODULE_NAME,
        .id_table = qedi_pci_tbl,
        .probe = qedi_probe,
        .remove = qedi_remove,
        .shutdown = qedi_shutdown,
+       .err_handler = &qedi_err_handler,
 };
 
 static int __init qedi_init(void)