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From: Clemens Ladisch on 7 Jun 2010 03:40
To avoid sharing interrupts, enable message-signaled interrupts, if
possible.

Tested with LSI 9260-8i/8e, where sharing the interrupt with the nvidia
driver would reduce the RAID performance.

Signed-off-by: Clemens Ladisch <clemens(a)ladisch.de>
Tested-by: Bert dd <bert.ddecker(a)gmail.com>
---
drivers/scsi/megaraid/megaraid_sas.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)

--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -3169,10 +3169,14 @@ megasas_probe_one(struct pci_dev *pdev,
if (megasas_init_mfi(instance))
goto fail_init_mfi;

+ pci_enable_msi(pdev);
+
/*
* Register IRQ
*/
- if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED, "megasas", instance)) {
+ if (request_irq(pdev->irq, megasas_isr,
+ pci_dev_msi_enabled(pdev) ? 0 : IRQF_SHARED,
+ "megasas", instance)) {
printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
goto fail_irq;
}
@@ -3222,6 +3226,8 @@ megasas_probe_one(struct pci_dev *pdev,
megasas_release_mfi(instance);

fail_irq:
+ pci_disable_msi(pdev);
+
fail_init_mfi:
fail_alloc_dma_buf:
if (instance->evt_detail)
@@ -3354,6 +3360,7 @@ megasas_suspend(struct pci_dev *pdev, pm
pci_set_drvdata(instance->pdev, instance);
instance->instancet->disable_intr(instance->reg_set);
free_irq(instance->pdev->irq, instance);
+ pci_disable_msi(pdev);

pci_save_state(pdev);
pci_disable_device(pdev);
@@ -3416,10 +3423,13 @@ megasas_resume(struct pci_dev *pdev)
tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
(unsigned long)instance);

+ pci_enable_msi(pdev);
+
/*
* Register IRQ
*/
- if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED,
+ if (request_irq(pdev->irq, megasas_isr,
+ pci_dev_msi_enabled(pdev) ? 0 : IRQF_SHARED,
"megasas", instance)) {
printk(KERN_ERR "megasas: Failed to register IRQ\n");
goto fail_irq;
@@ -3443,6 +3453,8 @@ megasas_resume(struct pci_dev *pdev)
return 0;

fail_irq:
+ pci_disable_msi(pdev);
+
fail_init_mfi:
if (instance->evt_detail)
pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
@@ -3519,6 +3531,7 @@ static void __devexit megasas_detach_one
instance->instancet->disable_intr(instance->reg_set);

free_irq(instance->pdev->irq, instance);
+ pci_disable_msi(pdev);

megasas_release_mfi(instance);

--
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Next: Add a new structure for skb buffer from external.