[SCSI] lpfc 8.1.11 : Add MSI (Message Signalled Interrupts) support

Add MSI (Message Signalled Interrupts) support
  Actual use must be enabled via the new module parameter "lpfc_use_msi"
  Defaults to no use

Many thanks to Frederic Temporelli who implemented the initial patch.

Signed-off-by: Frederic Temporelli <frederic.temporelli@ext.bull.net>
Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 6b0718573ac5..71ee0cd32216 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -1653,6 +1653,14 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         if (error)
                 goto out_remove_host;
 
+        if (phba->cfg_use_msi) {
+                error = pci_enable_msi(phba->pcidev);
+                if (error)
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT, "%d:0452 "
+                                        "Enable MSI failed, continuing with "
+                                        "IRQ\n", phba->brd_no);
+        }
+
         error = request_irq(phba->pcidev->irq, lpfc_intr_handler, IRQF_SHARED,
                                                         LPFC_DRIVER_NAME, phba);
         if (error) {
@@ -1732,6 +1740,7 @@ out_free_irq:
         lpfc_stop_timer(phba);
         phba->work_hba_events = 0;
         free_irq(phba->pcidev->irq, phba);
+        pci_disable_msi(phba->pcidev);
 out_free_sysfs_attr:
         lpfc_free_sysfs_attr(phba);
 out_remove_host:
@@ -1798,6 +1807,7 @@ lpfc_pci_remove_one(struct pci_dev *pdev)
 
         /* Release the irq reservation */
         free_irq(phba->pcidev->irq, phba);
+        pci_disable_msi(phba->pcidev);
 
         lpfc_cleanup(phba, 0);
         lpfc_stop_timer(phba);