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Message-Id: <20210903152430.244937-6-nitesh@redhat.com>
Date:   Fri,  3 Sep 2021 11:24:21 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-scsi@...r.kernel.org, netdev@...r.kernel.org,
        davem@...emloft.net, ajit.khaparde@...adcom.com,
        sriharsha.basavapatna@...adcom.com, somnath.kotur@...adcom.com,
        huangguangbin2@...wei.com, huangdaode@...wei.com,
        mtosatti@...hat.com, juri.lelli@...hat.com, frederic@...nel.org,
        abelits@...vell.com, bhelgaas@...gle.com, rostedt@...dmis.org,
        peterz@...radead.org
Cc:     nilal@...hat.com, jesse.brandeburg@...el.com, robin.murphy@....com,
        mingo@...nel.org, jbrandeb@...nel.org, akpm@...uxfoundation.org,
        sfr@...b.auug.org.au, stephen@...workplumber.org,
        rppt@...ux.vnet.ibm.com, chris.friesen@...driver.com,
        maz@...nel.org, nhorman@...driver.com, pjwaskiewicz@...il.com,
        sassmann@...hat.com, thenzl@...hat.com, james.smart@...adcom.com,
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        kabel@...nel.org, viresh.kumar@...aro.org, kuba@...nel.org,
        kashyap.desai@...adcom.com, sumit.saxena@...adcom.com,
        shivasharan.srikanteshwara@...adcom.com,
        sathya.prakash@...adcom.com, sreekanth.reddy@...adcom.com,
        suganath-prabu.subramani@...adcom.com, tglx@...utronix.de,
        ley.foon.tan@...el.com, jbrunet@...libre.com,
        johannes@...solutions.net, snelson@...sando.io,
        lewis.hanly@...rochip.com, benve@...co.com, _govind@....com,
        jassisinghbrar@...il.com
Subject: [PATCH v6 05/14] scsi: mpt3sas: Use irq_set_affinity_and_hint

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 (if not NULL) 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.

Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>
Reviewed-by: Sreekanth Reddy <sreekanth.reddy@...adcom.com>
---
 drivers/scsi/mpt3sas/mpt3sas_base.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 6c82435bc9cc..48b826b3414f 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -3084,6 +3084,7 @@ _base_check_enable_msix(struct MPT3SAS_ADAPTER *ioc)
 void
 mpt3sas_base_free_irq(struct MPT3SAS_ADAPTER *ioc)
 {
+	unsigned int irq;
 	struct adapter_reply_queue *reply_q, *next;
 
 	if (list_empty(&ioc->reply_queue_list))
@@ -3096,9 +3097,10 @@ mpt3sas_base_free_irq(struct MPT3SAS_ADAPTER *ioc)
 			continue;
 		}
 
-		if (ioc->smp_affinity_enable)
-			irq_set_affinity_hint(pci_irq_vector(ioc->pdev,
-			    reply_q->msix_index), NULL);
+		if (ioc->smp_affinity_enable) {
+			irq = pci_irq_vector(ioc->pdev, reply_q->msix_index);
+			irq_update_affinity_hint(irq, NULL);
+		}
 		free_irq(pci_irq_vector(ioc->pdev, reply_q->msix_index),
 			 reply_q);
 		kfree(reply_q);
@@ -3165,18 +3167,15 @@ _base_request_irq(struct MPT3SAS_ADAPTER *ioc, u8 index)
  * @ioc: per adapter object
  *
  * The enduser would need to set the affinity via /proc/irq/#/smp_affinity
- *
- * It would nice if we could call irq_set_affinity, however it is not
- * an exported symbol
  */
 static void
 _base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc)
 {
-	unsigned int cpu, nr_cpus, nr_msix, index = 0;
+	unsigned int cpu, nr_cpus, nr_msix, index = 0, irq;
 	struct adapter_reply_queue *reply_q;
-	int local_numa_node;
 	int iopoll_q_count = ioc->reply_queue_count -
 	    ioc->iopoll_q_start_index;
+	const struct cpumask *mask;
 
 	if (!_base_is_controller_msix_enabled(ioc))
 		return;
@@ -3199,11 +3198,11 @@ _base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc)
 		 * corresponding to high iops queues.
 		 */
 		if (ioc->high_iops_queues) {
-			local_numa_node = dev_to_node(&ioc->pdev->dev);
+			mask = cpumask_of_node(dev_to_node(&ioc->pdev->dev));
 			for (index = 0; index < ioc->high_iops_queues;
 			    index++) {
-				irq_set_affinity_hint(pci_irq_vector(ioc->pdev,
-				    index), cpumask_of_node(local_numa_node));
+				irq = pci_irq_vector(ioc->pdev, index);
+				irq_set_affinity_and_hint(irq, mask);
 			}
 		}
 
-- 
2.27.0

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