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[SCSI] megaraid_sas: Add MSI-X support and msix_disable module parameter 

This patch adds MSI-X support and 'msix_disable' module parameter to
the megaraid_sas driver.

Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
adam radford 2010-12-21 10:17:40 -08:00 committed by James Bottomley
parent 46081b1664
commit 80d9da98b4
2 changed files with 37 additions and 7 deletions
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3
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -1335,6 +1335,9 @@ struct megasas_instance {
struct timer_list io_completion_timer;
struct list_head internal_reset_pending_q;
u8 msi_flag;
struct msix_entry msixentry;
};
enum {

41
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@ -72,6 +72,10 @@ module_param_named(max_sectors, max_sectors, int, 0);
MODULE_PARM_DESC(max_sectors,
"Maximum number of sectors per IO command");
static int msix_disable;
module_param(msix_disable, int, S_IRUGO);
MODULE_PARM_DESC(msix_disable, "Disable MSI-X interrupt handling. Default: 0");
MODULE_LICENSE("GPL");
MODULE_VERSION(MEGASAS_VERSION);
MODULE_AUTHOR("megaraidlinux@lsi.com");
@ -3863,10 +3867,20 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
if (megasas_init_mfi(instance))
goto fail_init_mfi;
/* Try to enable MSI-X */
if ((instance->pdev->device != PCI_DEVICE_ID_LSI_SAS1078R) &&
(instance->pdev->device != PCI_DEVICE_ID_LSI_SAS1078DE) &&
(instance->pdev->device != PCI_DEVICE_ID_LSI_VERDE_ZCR) &&
!msix_disable && !pci_enable_msix(instance->pdev,
&instance->msixentry, 1))
instance->msi_flag = 1;
/*
* Register IRQ
*/
if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED, "megasas", instance)) {
if (request_irq(instance->msi_flag ? instance->msixentry.vector :
pdev->irq, megasas_isr,
IRQF_SHARED, "megasas", instance)) {
printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
goto fail_irq;
}
@ -3911,8 +3925,10 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, NULL);
instance->instancet->disable_intr(instance->reg_set);
free_irq(instance->pdev->irq, instance);
free_irq(instance->msi_flag ? instance->msixentry.vector :
instance->pdev->irq, instance);
if (instance->msi_flag)
pci_disable_msix(instance->pdev);
megasas_release_mfi(instance);
fail_irq:
@ -4053,7 +4069,10 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state)
pci_set_drvdata(instance->pdev, instance);
instance->instancet->disable_intr(instance->reg_set);
free_irq(instance->pdev->irq, instance);
free_irq(instance->msi_flag ? instance->msixentry.vector :
instance->pdev->irq, instance);
if (instance->msi_flag)
pci_disable_msix(instance->pdev);
pci_save_state(pdev);
pci_disable_device(pdev);
@ -4116,11 +4135,16 @@ megasas_resume(struct pci_dev *pdev)
tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
(unsigned long)instance);
/* Now re-enable MSI-X */
if (instance->msi_flag)
pci_enable_msix(instance->pdev, &instance->msixentry, 1);
/*
* Register IRQ
*/
if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED,
"megasas", instance)) {
if (request_irq(instance->msi_flag ? instance->msixentry.vector :
pdev->irq, megasas_isr,
IRQF_SHARED, "megasas", instance)) {
printk(KERN_ERR "megasas: Failed to register IRQ\n");
goto fail_irq;
}
@ -4218,7 +4242,10 @@ static void __devexit megasas_detach_one(struct pci_dev *pdev)
instance->instancet->disable_intr(instance->reg_set);
free_irq(instance->pdev->irq, instance);
free_irq(instance->msi_flag ? instance->msixentry.vector :
instance->pdev->irq, instance);
if (instance->msi_flag)
pci_disable_msix(instance->pdev);
megasas_release_mfi(instance);