[v5,04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint

Message ID 20210720232624.1493424-5-nitesh@redhat.com
State Superseded
Headers show
Series
  • genirq: Cleanup the abuse of irq_set_affinity_hint()
Related show

Commit Message

Nitesh Narayan Lal July 20, 2021, 11:26 p.m.
The driver uses irq_set_affinity_hint() specifically for the high IOPS
queue interrupts for two purposes:

- To set the affinity_hint which is consumed by the userspace for
  distributing the interrupts

- To apply an affinity that it provides

The driver enforces its own affinity to bind the high IOPS queue interrupts
to the local NUMA node. However, irq_set_affinity_hint() applying the
provided cpumask as an affinity for the interrupt is an undocumented side
effect.

To remove this side effect irq_set_affinity_hint() has been marked
as deprecated and new interfaces have been introduced. Hence, replace the
irq_set_affinity_hint() with the new interface irq_set_affinity_and_hint()
where the provided mask needs to be applied as the affinity and
affinity_hint pointer needs to be set and replace with
irq_update_affinity_hint() where only affinity_hint needs to be updated.

Change the megasas_set_high_iops_queue_affinity_hint function name to
megasas_set_high_iops_queue_affinity_and_hint to clearly indicate that the
function is setting both affinity and affinity_hint.

Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
---
 drivers/scsi/megaraid/megaraid_sas_base.c | 27 +++++++++++++----------
 1 file changed, 15 insertions(+), 12 deletions(-)

Comments

Sumit Saxena Aug. 6, 2021, 11:31 a.m. | #1
On Wed, Jul 21, 2021 at 4:57 AM Nitesh Narayan Lal <nitesh@redhat.com> wrote:
>
> The driver uses irq_set_affinity_hint() specifically for the high IOPS
> queue interrupts for two purposes:
>
> - To set the affinity_hint which is consumed by the userspace for
>   distributing the interrupts
>
> - To apply an affinity that it provides
>
> The driver enforces its own affinity to bind the high IOPS queue interrupts
> to the local NUMA node. However, irq_set_affinity_hint() applying the
> provided cpumask as an affinity for the interrupt is an undocumented side
> effect.
>
> To remove this side effect irq_set_affinity_hint() has been marked
> as deprecated and new interfaces have been introduced. Hence, replace the
> irq_set_affinity_hint() with the new interface irq_set_affinity_and_hint()
> where the provided mask needs to be applied as the affinity and
> affinity_hint pointer needs to be set and replace with
> irq_update_affinity_hint() where only affinity_hint needs to be updated.
>
> Change the megasas_set_high_iops_queue_affinity_hint function name to
> megasas_set_high_iops_queue_affinity_and_hint to clearly indicate that the
> function is setting both affinity and affinity_hint.
>
> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
Looks good.
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>

Patch

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index ec10b2497310..836a1b13f71b 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -5718,7 +5718,7 @@  megasas_setup_irqs_msix(struct megasas_instance *instance, u8 is_probe)
 				"Failed to register IRQ for vector %d.\n", i);
 			for (j = 0; j < i; j++) {
 				if (j < instance->low_latency_index_start)
-					irq_set_affinity_hint(
+					irq_update_affinity_hint(
 						pci_irq_vector(pdev, j), NULL);
 				free_irq(pci_irq_vector(pdev, j),
 					 &instance->irq_context[j]);
@@ -5761,7 +5761,7 @@  megasas_destroy_irqs(struct megasas_instance *instance) {
 	if (instance->msix_vectors)
 		for (i = 0; i < instance->msix_vectors; i++) {
 			if (i < instance->low_latency_index_start)
-				irq_set_affinity_hint(
+				irq_update_affinity_hint(
 				    pci_irq_vector(instance->pdev, i), NULL);
 			free_irq(pci_irq_vector(instance->pdev, i),
 				 &instance->irq_context[i]);
@@ -5892,22 +5892,25 @@  int megasas_get_device_list(struct megasas_instance *instance)
 }
 
 /**
- * megasas_set_high_iops_queue_affinity_hint -	Set affinity hint for high IOPS queues
- * @instance:					Adapter soft state
- * return:					void
+ * megasas_set_high_iops_queue_affinity_and_hint -	Set affinity and hint
+ *							for high IOPS queues
+ * @instance:						Adapter soft state
+ * return:						void
  */
 static inline void
-megasas_set_high_iops_queue_affinity_hint(struct megasas_instance *instance)
+megasas_set_high_iops_queue_affinity_and_hint(struct megasas_instance *instance)
 {
 	int i;
-	int local_numa_node;
+	unsigned int irq;
+	const struct cpumask *mask;
 
 	if (instance->perf_mode == MR_BALANCED_PERF_MODE) {
-		local_numa_node = dev_to_node(&instance->pdev->dev);
+		mask = cpumask_of_node(dev_to_node(&instance->pdev->dev));
 
-		for (i = 0; i < instance->low_latency_index_start; i++)
-			irq_set_affinity_hint(pci_irq_vector(instance->pdev, i),
-				cpumask_of_node(local_numa_node));
+		for (i = 0; i < instance->low_latency_index_start; i++) {
+			irq = pci_irq_vector(instance->pdev, i);
+			irq_set_affinity_and_hint(irq, mask);
+		}
 	}
 }
 
@@ -5996,7 +5999,7 @@  megasas_alloc_irq_vectors(struct megasas_instance *instance)
 		instance->msix_vectors = 0;
 
 	if (instance->smp_affinity_enable)
-		megasas_set_high_iops_queue_affinity_hint(instance);
+		megasas_set_high_iops_queue_affinity_and_hint(instance);
 }
 
 /**