linux-kernel - [PATCH v3 11/14] scsi: lpfc: Use irq_set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210713211502.464259-12-nitesh@redhat.com>
Date:   Tue, 13 Jul 2021 17:14:59 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-api@...r.kernel.org, linux-pci@...r.kernel.org,
        tglx@...utronix.de, jesse.brandeburg@...el.com,
        robin.murphy@....com, mtosatti@...hat.com, mingo@...nel.org,
        jbrandeb@...nel.org, frederic@...nel.org, juri.lelli@...hat.com,
        abelits@...vell.com, bhelgaas@...gle.com, rostedt@...dmis.org,
        peterz@...radead.org, davem@...emloft.net,
        akpm@...ux-foundation.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,
        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, james.smart@...adcom.com,
        dick.kennedy@...adcom.com, jkc@...hat.com, faisal.latif@...el.com,
        shiraz.saleem@...el.com, tariqt@...dia.com, ahleihel@...hat.com,
        kheib@...hat.com, borisp@...dia.com, saeedm@...dia.com,
        benve@...co.com, govind@....com, jassisinghbrar@...il.com,
        ajit.khaparde@...adcom.com, sriharsha.basavapatna@...adcom.com,
        somnath.kotur@...adcom.com, nilal@...hat.com,
        tatyana.e.nikolova@...el.com, mustafa.ismail@...el.com,
        ahs3@...hat.com, leonro@...dia.com, chandrakanth.patil@...adcom.com
Subject: [PATCH v3 11/14] scsi: lpfc: Use irq_set_affinity

The driver uses irq_set_affinity_hint to set the affinity for the lpfc
interrupts to a mask corresponding to the local NUMA node to avoid
performance overhead on AMD architectures.

However, irq_set_affinity_hint() setting the affinity is an undocumented
side effect that this function also sets the affinity under the hood.
To remove this side effect irq_set_affinity_hint() has been marked as
deprecated and new interfaces have been introduced.

Also, as per the commit dcaa21367938 ("scsi: lpfc: Change default IRQ model
on AMD architectures"):
"On AMD architecture, revert the irq allocation to the normal style
(non-managed) and then use irq_set_affinity_hint() to set the cpu affinity
and disable user-space rebalancing."
we don't really need to set the affinity_hint as user-space rebalancing for
the lpfc interrupts is not desired.

Hence, replace the irq_set_affinity_hint() with irq_set_affinity() which
only applies the affinity for the interrupts.

Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>
---
 drivers/scsi/lpfc/lpfc_init.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 5983e05b648f..8a16bacb8c93 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -11455,7 +11455,7 @@ lpfc_irq_set_aff(struct lpfc_hba_eq_hdl *eqhdl, unsigned int cpu)
 	cpumask_clear(&eqhdl->aff_mask);
 	cpumask_set_cpu(cpu, &eqhdl->aff_mask);
 	irq_set_status_flags(eqhdl->irq, IRQ_NO_BALANCING);
-	irq_set_affinity_hint(eqhdl->irq, &eqhdl->aff_mask);
+	irq_set_affinity(eqhdl->irq, &eqhdl->aff_mask);
 }
 
 /**
@@ -11744,7 +11744,6 @@ lpfc_sli4_enable_msix(struct lpfc_hba *phba)
 	for (--index; index >= 0; index--) {
 		eqhdl = lpfc_get_eq_hdl(index);
 		lpfc_irq_clear_aff(eqhdl);
-		irq_set_affinity_hint(eqhdl->irq, NULL);
 		free_irq(eqhdl->irq, eqhdl);
 	}
 
@@ -11905,7 +11904,6 @@ lpfc_sli4_disable_intr(struct lpfc_hba *phba)
 		for (index = 0; index < phba->cfg_irq_chann; index++) {
 			eqhdl = lpfc_get_eq_hdl(index);
 			lpfc_irq_clear_aff(eqhdl);
-			irq_set_affinity_hint(eqhdl->irq, NULL);
 			free_irq(eqhdl->irq, eqhdl);
 		}
 	} else {
-- 
2.27.0