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 <[EMAIL PROTECTED]>
Signed-off-by: James Smart <[EMAIL PROTECTED]>
diff -upNr a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
--- a/drivers/scsi/lpfc/lpfc_attr.c 2006-12-02 12:07:50.000000000 -0500
+++ b/drivers/scsi/lpfc/lpfc_attr.c 2006-12-02 12:11:35.000000000 -0500
@@ -961,6 +961,15 @@ LPFC_ATTR_R(max_luns, 255, 0, 65535,
LPFC_ATTR_RW(poll_tmo, 10, 1, 255,
"Milliseconds driver will wait between polling FCP ring");
+/*
+# lpfc_use_msi: Use MSI (Message Signaled Interrupts) in systems that
+# support this feature
+# 0 = MSI disabled (default)
+# 1 = MSI enabled
+# Value range is [0,1]. Default value is 0.
+*/
+LPFC_ATTR_R(use_msi, 0, 0, 1, "Use Message Signaled Interrupts, if possible");
+
struct class_device_attribute *lpfc_host_attrs[] = {
&class_device_attr_info,
@@ -999,6 +1008,7 @@ struct class_device_attribute *lpfc_host
&class_device_attr_issue_reset,
&class_device_attr_lpfc_poll,
&class_device_attr_lpfc_poll_tmo,
+ &class_device_attr_lpfc_use_msi,
&class_device_attr_lpfc_soft_wwpn,
&class_device_attr_lpfc_soft_wwpn_enable,
NULL,
@@ -1801,6 +1811,7 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
lpfc_discovery_threads_init(phba, lpfc_discovery_threads);
lpfc_max_luns_init(phba, lpfc_max_luns);
lpfc_poll_tmo_init(phba, lpfc_poll_tmo);
+ lpfc_use_msi_init(phba, lpfc_use_msi);
lpfc_devloss_tmo_init(phba, lpfc_devloss_tmo);
lpfc_nodev_tmo_init(phba, lpfc_nodev_tmo);
phba->cfg_poll = lpfc_poll;
diff -upNr a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
--- a/drivers/scsi/lpfc/lpfc.h 2006-12-02 11:57:07.000000000 -0500
+++ b/drivers/scsi/lpfc/lpfc.h 2006-12-02 12:11:35.000000000 -0500
@@ -303,6 +303,7 @@ struct lpfc_hba {
uint32_t cfg_max_luns;
uint32_t cfg_poll;
uint32_t cfg_poll_tmo;
+ uint32_t cfg_use_msi;
uint32_t cfg_sg_seg_cnt;
uint32_t cfg_sg_dma_buf_size;
uint64_t cfg_soft_wwpn;
diff -upNr a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
--- a/drivers/scsi/lpfc/lpfc_init.c 2006-12-02 12:02:00.000000000 -0500
+++ b/drivers/scsi/lpfc/lpfc_init.c 2006-12-02 12:11:35.000000000 -0500
@@ -1653,6 +1653,14 @@ lpfc_pci_probe_one(struct pci_dev *pdev,
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);
-
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