From ac95136ad40fc72c4842fee1ef002390ad96bfa0 Mon Sep 17 00:00:00 2001 From: "Sumit.Saxena@avagotech.com" Date: Fri, 12 Sep 2014 18:57:48 +0530 Subject: [PATCH] megaraid_sas : Add module parameter to disable IRQ-CPU affinity hint Resending the patch. Addressed the review comments from Tomas Henzl. For certain deployment, we may need to disable irq cpu affinity hint. This module parameter provides option for use to disable irq cpu affinity hint and allow irqbalancer to handle the rest. Signed-off-by: Sumit Saxena Signed-off-by: Kashyap Desai Reviewed-by: Tomas Henzl Signed-off-by: Christoph Hellwig --- drivers/scsi/megaraid/megaraid_sas_base.c | 60 ++++++++++++++--------- 1 file changed, 38 insertions(+), 22 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index bc79a0568acf..4c4c266e2388 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -89,6 +89,10 @@ module_param(resetwaittime, int, S_IRUGO); MODULE_PARM_DESC(resetwaittime, "Wait time in seconds after I/O timeout " "before resetting adapter. Default: 180"); +int smp_affinity_enable = 1; +module_param(smp_affinity_enable, int, S_IRUGO); +MODULE_PARM_DESC(smp_affinity_enable, "SMP affinity feature enable/disbale Default: enable(1)"); + MODULE_LICENSE("GPL"); MODULE_VERSION(MEGASAS_VERSION); MODULE_AUTHOR("megaraidlinux@lsi.com"); @@ -5162,8 +5166,9 @@ retry_irq_register: printk(KERN_DEBUG "megasas: Failed to " "register IRQ for vector %d.\n", i); for (j = 0; j < i; j++) { - irq_set_affinity_hint( - instance->msixentry[j].vector, NULL); + if (smp_affinity_enable) + irq_set_affinity_hint( + instance->msixentry[j].vector, NULL); free_irq( instance->msixentry[j].vector, &instance->irq_context[j]); @@ -5172,11 +5177,14 @@ retry_irq_register: instance->msix_vectors = 0; goto retry_irq_register; } - if (irq_set_affinity_hint(instance->msixentry[i].vector, - get_cpu_mask(cpu))) - dev_err(&instance->pdev->dev, "Error setting" - "affinity hint for cpu %d\n", cpu); - cpu = cpumask_next(cpu, cpu_online_mask); + if (smp_affinity_enable) { + if (irq_set_affinity_hint(instance->msixentry[i].vector, + get_cpu_mask(cpu))) + dev_err(&instance->pdev->dev, + "Error setting affinity hint " + "for cpu %d\n", cpu); + cpu = cpumask_next(cpu, cpu_online_mask); + } } } else { instance->irq_context[0].instance = instance; @@ -5235,8 +5243,9 @@ retry_irq_register: instance->instancet->disable_intr(instance); if (instance->msix_vectors) for (i = 0; i < instance->msix_vectors; i++) { - irq_set_affinity_hint( - instance->msixentry[i].vector, NULL); + if (smp_affinity_enable) + irq_set_affinity_hint( + instance->msixentry[i].vector, NULL); free_irq(instance->msixentry[i].vector, &instance->irq_context[i]); } @@ -5399,8 +5408,9 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state) if (instance->msix_vectors) for (i = 0; i < instance->msix_vectors; i++) { - irq_set_affinity_hint( - instance->msixentry[i].vector, NULL); + if (smp_affinity_enable) + irq_set_affinity_hint( + instance->msixentry[i].vector, NULL); free_irq(instance->msixentry[i].vector, &instance->irq_context[i]); } @@ -5509,8 +5519,9 @@ megasas_resume(struct pci_dev *pdev) printk(KERN_DEBUG "megasas: Failed to " "register IRQ for vector %d.\n", i); for (j = 0; j < i; j++) { - irq_set_affinity_hint( - instance->msixentry[j].vector, NULL); + if (smp_affinity_enable) + irq_set_affinity_hint( + instance->msixentry[j].vector, NULL); free_irq( instance->msixentry[j].vector, &instance->irq_context[j]); @@ -5518,11 +5529,14 @@ megasas_resume(struct pci_dev *pdev) goto fail_irq; } - if (irq_set_affinity_hint(instance->msixentry[i].vector, - get_cpu_mask(cpu))) - dev_err(&instance->pdev->dev, "Error setting" - "affinity hint for cpu %d\n", cpu); - cpu = cpumask_next(cpu, cpu_online_mask); + if (smp_affinity_enable) { + if (irq_set_affinity_hint(instance->msixentry[i].vector, + get_cpu_mask(cpu))) + dev_err(&instance->pdev->dev, "Error " + "setting affinity hint for cpu " + "%d\n", cpu); + cpu = cpumask_next(cpu, cpu_online_mask); + } } } else { instance->irq_context[0].instance = instance; @@ -5640,8 +5654,9 @@ static void megasas_detach_one(struct pci_dev *pdev) if (instance->msix_vectors) for (i = 0; i < instance->msix_vectors; i++) { - irq_set_affinity_hint( - instance->msixentry[i].vector, NULL); + if (smp_affinity_enable) + irq_set_affinity_hint( + instance->msixentry[i].vector, NULL); free_irq(instance->msixentry[i].vector, &instance->irq_context[i]); } @@ -5729,8 +5744,9 @@ static void megasas_shutdown(struct pci_dev *pdev) instance->instancet->disable_intr(instance); if (instance->msix_vectors) for (i = 0; i < instance->msix_vectors; i++) { - irq_set_affinity_hint( - instance->msixentry[i].vector, NULL); + if (smp_affinity_enable) + irq_set_affinity_hint( + instance->msixentry[i].vector, NULL); free_irq(instance->msixentry[i].vector, &instance->irq_context[i]); } -- 2.39.5