diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/scsi/megaraid/megaraid_sas_base.c | 135 |
1 files changed, 118 insertions, 17 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 4c7a0930b1a1..0abef940b67b 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -5472,6 +5472,8 @@ megasas_setup_irqs_ioapic(struct megasas_instance *instance) __func__, __LINE__); return -1; } + instance->balanced_mode = false; + instance->low_latency_index_start = 0; return 0; } @@ -5610,9 +5612,11 @@ skip_alloc: static void megasas_setup_reply_map(struct megasas_instance *instance) { const struct cpumask *mask; - unsigned int queue, cpu; + unsigned int queue, cpu, low_latency_index_start; - for (queue = 0; queue < instance->msix_vectors; queue++) { + low_latency_index_start = instance->low_latency_index_start; + + for (queue = low_latency_index_start; queue < instance->msix_vectors; queue++) { mask = pci_irq_get_affinity(instance->pdev, queue); if (!mask) goto fallback; @@ -5623,8 +5627,14 @@ static void megasas_setup_reply_map(struct megasas_instance *instance) return; fallback: - for_each_possible_cpu(cpu) - instance->reply_map[cpu] = cpu % instance->msix_vectors; + queue = low_latency_index_start; + for_each_possible_cpu(cpu) { + instance->reply_map[cpu] = queue; + if (queue == (instance->msix_vectors - 1)) + queue = low_latency_index_start; + else + queue++; + } } /** @@ -5661,6 +5671,66 @@ int megasas_get_device_list(struct megasas_instance *instance) return SUCCESS; } + +static int +__megasas_alloc_irq_vectors(struct megasas_instance *instance) +{ + int i, irq_flags; + struct irq_affinity desc = { .pre_vectors = instance->low_latency_index_start }; + struct irq_affinity *descp = &desc; + + irq_flags = PCI_IRQ_MSIX; + + if (instance->smp_affinity_enable) + irq_flags |= PCI_IRQ_AFFINITY; + else + descp = NULL; + + i = pci_alloc_irq_vectors_affinity(instance->pdev, + instance->low_latency_index_start, + instance->msix_vectors, irq_flags, descp); + + return i; +} + +/** + * megasas_alloc_irq_vectors - Allocate IRQ vectors/enable MSI-x vectors + * @instance: Adapter soft state + * return: void + */ +static void +megasas_alloc_irq_vectors(struct megasas_instance *instance) +{ + int i; + unsigned int num_msix_req; + + i = __megasas_alloc_irq_vectors(instance); + + if (instance->balanced_mode && (i != instance->msix_vectors)) { + if (instance->msix_vectors) + pci_free_irq_vectors(instance->pdev); + /* Disable Balanced IOPS mode and try realloc vectors */ + instance->balanced_mode = false; + instance->low_latency_index_start = 1; + num_msix_req = num_online_cpus() + instance->low_latency_index_start; + + instance->msix_vectors = min(num_msix_req, + instance->msix_vectors); + + i = __megasas_alloc_irq_vectors(instance); + + } + + dev_info(&instance->pdev->dev, + "requested/available msix %d/%d\n", instance->msix_vectors, i); + + if (i > 0) + instance->msix_vectors = i; + else + instance->msix_vectors = 0; + +} + /** * megasas_init_fw - Initializes the FW * @instance: Adapter soft state @@ -5680,6 +5750,8 @@ static int megasas_init_fw(struct megasas_instance *instance) int i, j, loop; struct IOV_111 *iovPtr; struct fusion_context *fusion; + bool intr_coalescing; + unsigned int num_msix_req; fusion = instance->ctrl_context; @@ -5799,7 +5871,6 @@ static int megasas_init_fw(struct megasas_instance *instance) msix_enable = (instance->instancet->read_fw_status_reg(instance) & 0x4000000) >> 0x1a; if (msix_enable && !msix_disable) { - int irq_flags = PCI_IRQ_MSIX; scratch_pad_1 = megasas_readl (instance, &instance->reg_set->outbound_scratch_pad_1); @@ -5865,19 +5936,49 @@ static int megasas_init_fw(struct megasas_instance *instance) } else /* MFI adapters */ instance->msix_vectors = 1; - /* Don't bother allocating more MSI-X vectors than cpus */ - instance->msix_vectors = min(instance->msix_vectors, - (unsigned int)num_online_cpus()); - if (instance->smp_affinity_enable) - irq_flags |= PCI_IRQ_AFFINITY; - i = pci_alloc_irq_vectors(instance->pdev, 1, - instance->msix_vectors, irq_flags); - if (i > 0) { - instance->msix_vectors = i; - } else { - instance->msix_vectors = 0; + + /* + * For Aero (if some conditions are met), driver will configure a + * few additional reply queues with interrupt coalescing enabled. + * These queues with interrupt coalescing enabled are called + * High IOPS queues and rest of reply queues (based on number of + * logical CPUs) are termed as Low latency queues. + * + * Total Number of reply queues = High IOPS queues + low latency queues + * + * For rest of fusion adapters, 1 additional reply queue will be + * reserved for management commands, rest of reply queues + * (based on number of logical CPUs) will be used for IOs and + * referenced as IO queues. + * Total Number of reply queues = 1 + IO queues + * + * MFI adapters supports single MSI-x so single reply queue + * will be used for IO and management commands. + */ + + intr_coalescing = (scratch_pad_1 & MR_INTR_COALESCING_SUPPORT_OFFSET) ? + true : false; + if (intr_coalescing && + (num_online_cpus() >= MR_HIGH_IOPS_QUEUE_COUNT) && + (instance->msix_vectors == MEGASAS_MAX_MSIX_QUEUES)) + instance->balanced_mode = true; + else + instance->balanced_mode = false; + + if (instance->balanced_mode) + instance->low_latency_index_start = + MR_HIGH_IOPS_QUEUE_COUNT; + else + instance->low_latency_index_start = 1; + + num_msix_req = num_online_cpus() + instance->low_latency_index_start; + + instance->msix_vectors = min(num_msix_req, + instance->msix_vectors); + + megasas_alloc_irq_vectors(instance); + if (!instance->msix_vectors) instance->msix_load_balance = false; - } } /* * MSI-X host index 0 is common for all adapter. |