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Date: Thu, 17 Jun 2021 20:31:05 +0100
From: Robin Murphy <robin.murphy@....com>
To: Nitesh Narayan Lal <nitesh@...hat.com>,
linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
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Subject: Re: [PATCH v1 04/14] scsi: megaraid_sas: Use
irq_set_affinity_and_hint
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@...hat.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);
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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