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Subject[PATCH v1 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint
Date
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@redhat.com>
---
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);

- 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);
+ }
}
}

@@ -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);
}

/**
--
2.27.0
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