scsi: ibmvfc: Add Sub-CRQ IRQ enable/disable routine

Each Sub-CRQ has its own interrupt. A hypercall is required to toggle the
IRQ state. Provide the necessary mechanism via a helper function.

Link: https://lore.kernel.org/r/20210114203148.246656-9-tyreld@linux.ibm.com
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index bad0dae639bf2ac30519ac9cf421c47aef233782..04efaa4e97b667362d5e8beb01efd248ac2f62fe 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -3465,6 +3465,26 @@ static void ibmvfc_tasklet(void *data)
        }
 }
 
+static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
+{
+       struct device *dev = scrq->vhost->dev;
+       struct vio_dev *vdev = to_vio_dev(dev);
+       unsigned long rc;
+       int irq_action = H_ENABLE_VIO_INTERRUPT;
+
+       if (!enable)
+               irq_action = H_DISABLE_VIO_INTERRUPT;
+
+       rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
+                               scrq->hw_irq, 0, 0);
+
+       if (rc)
+               dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
+                       enable ? "enable" : "disable", scrq->hwq_id, rc);
+
+       return rc;
+}
+
 /**
  * ibmvfc_init_tgt - Set the next init job step for the target
  * @tgt:               ibmvfc target struct