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authoradam radford <aradford@gmail.com>2010-12-21 10:17:40 -0800
committerJames Bottomley <James.Bottomley@suse.de>2010-12-22 23:26:51 -0600
commit80d9da98b4034edd31f6bacdb96c7489c4460173 (patch)
tree6577cb9ef6b9ea38fafb289154067f502a85a723 /drivers
parent46081b166415acb66d4b3150ecefcd9460bb48a1 (diff)
[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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/megaraid/megaraid_sas.h3
-rw-r--r--drivers/scsi/megaraid/megaraid_sas_base.c41
2 files changed, 37 insertions, 7 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 224ec31e5c97..ff9845c72a67 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -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 {
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index dab29db3b48e..2318183f9a67 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -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);