Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Nitesh Narayan Lal <nitesh@redhat.com>
To:     linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
        intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
        linux-api@vger.kernel.org, linux-pci@vger.kernel.org,
        tglx@linutronix.de, jesse.brandeburg@intel.com,
        robin.murphy@arm.com, mtosatti@redhat.com, mingo@kernel.org,
        jbrandeb@kernel.org, frederic@kernel.org, juri.lelli@redhat.com,
        abelits@marvell.com, bhelgaas@google.com, rostedt@goodmis.org,
        peterz@infradead.org, davem@davemloft.net,
        akpm@linux-foundation.org, sfr@canb.auug.org.au,
        stephen@networkplumber.org, rppt@linux.vnet.ibm.com,
        chris.friesen@windriver.com, maz@kernel.org, nhorman@tuxdriver.com,
        pjwaskiewicz@gmail.com, sassmann@redhat.com, thenzl@redhat.com,
        kashyap.desai@broadcom.com, sumit.saxena@broadcom.com,
        shivasharan.srikanteshwara@broadcom.com,
        sathya.prakash@broadcom.com, sreekanth.reddy@broadcom.com,
        suganath-prabu.subramani@broadcom.com, james.smart@broadcom.com,
        dick.kennedy@broadcom.com, jkc@redhat.com, faisal.latif@intel.com,
        shiraz.saleem@intel.com, tariqt@nvidia.com, ahleihel@redhat.com,
        kheib@redhat.com, borisp@nvidia.com, saeedm@nvidia.com,
        benve@cisco.com, govind@gmx.com, jassisinghbrar@gmail.com,
        ajit.khaparde@broadcom.com, sriharsha.basavapatna@broadcom.com,
        somnath.kotur@broadcom.com, nilal@redhat.com,
        tatyana.e.nikolova@intel.com, mustafa.ismail@intel.com,
        ahs3@redhat.com, leonro@nvidia.com
Subject: [PATCH v2 05/14] scsi: mpt3sas: Use irq_set_affinity_and_hint
Date:   Tue, 29 Jun 2021 11:27:37 -0400
Message-Id: <20210629152746.2953364-6-nitesh@redhat.com>
In-Reply-To: <20210629152746.2953364-1-nitesh@redhat.com>
References: <20210629152746.2953364-1-nitesh@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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()
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.

Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.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 5779f313f6f8..d07cf66ecf09 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -2990,6 +2990,7 @@ _base_check_enable_msix(struct MPT3SAS_ADAPTER *ioc)
 static void
 _base_free_irq(struct MPT3SAS_ADAPTER *ioc)
 {
+	unsigned int irq;
 	struct adapter_reply_queue *reply_q, *next;
 
 	if (list_empty(&ioc->reply_queue_list))
@@ -2997,9 +2998,10 @@ _base_free_irq(struct MPT3SAS_ADAPTER *ioc)
 
 	list_for_each_entry_safe(reply_q, next, &ioc->reply_queue_list, list) {
 		list_del(&reply_q->list);
-		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);
@@ -3055,16 +3057,13 @@ _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;
+	const struct cpumask *mask;
 
 	if (!_base_is_controller_msix_enabled(ioc))
 		return;
@@ -3087,11 +3086,11 @@ _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