Re: [PATCH v1 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint

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On 2021-06-17 19:22, Nitesh Narayan Lal 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()
that clearly indicates the purpose of the usage and is meant to apply the
affinity and set the affinity_hint pointer. Also, replace
irq_set_affinity_hint() with irq_update_affinity_hint() when 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@xxxxxxxxxx>
---
  drivers/scsi/megaraid/megaraid_sas_base.c | 25 ++++++++++++++---------
  1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 4d4e9dbe5193..54f4eac09589 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -5666,7 +5666,7 @@ 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]);
@@ -5709,7 +5709,7 @@ 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]);
@@ -5840,22 +5840,27 @@ 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;
+	unsigned int irq;
  	int local_numa_node;
+	const struct cpumask *mask;
if (instance->perf_mode == MR_BALANCED_PERF_MODE) {
  		local_numa_node = dev_to_node(&instance->pdev->dev);

Drive-by nit: you could assign mask in this scope.

-		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);
+			mask = cpumask_of_node(local_numa_node);
+			irq_update_affinity_hint(irq, mask);

And this doesn't seem to match what the commit message says?

Robin.

+		}
  	}
  }
@@ -5944,7 +5949,7 @@ 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);
  }
/**




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