linux-kernel - [tip: irq/urgent] powerpc/pseries: Pass MSI affinity to irq_create

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Message-ID: <160673574245.3364.4192827087700999581.tip-bot2@tip-bot2>
Date:   Mon, 30 Nov 2020 11:29:02 -0000
From:   "tip-bot2 for Laurent Vivier" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Laurent Vivier <lvivier@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kurz <groug@...d.org>,
        Michael Ellerman <mpe@...erman.id.au>, stable@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/urgent] powerpc/pseries: Pass MSI affinity to irq_create_mapping()

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     9ea69a55b3b9a71cded9726af591949c1138f235
Gitweb:        https://git.kernel.org/tip/9ea69a55b3b9a71cded9726af591949c1138f235
Author:        Laurent Vivier <lvivier@...hat.com>
AuthorDate:    Thu, 26 Nov 2020 09:28:52 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Mon, 30 Nov 2020 12:22:04 +01:00

powerpc/pseries: Pass MSI affinity to irq_create_mapping()

With virtio multiqueue, normally each queue IRQ is mapped to a CPU.

Commit 0d9f0a52c8b9f ("virtio_scsi: use virtio IRQ affinity") exposed
an existing shortcoming of the arch code by moving virtio_scsi to
the automatic IRQ affinity assignment.

The affinity is correctly computed in msi_desc but this is not applied
to the system IRQs.

It appears the affinity is correctly passed to rtas_setup_msi_irqs() but
lost at this point and never passed to irq_domain_alloc_descs()
(see commit 06ee6d571f0e ("genirq: Add affinity hint to irq allocation"))
because irq_create_mapping() doesn't take an affinity parameter.

Use the new irq_create_mapping_affinity() function, which allows to forward
the affinity setting from rtas_setup_msi_irqs() to irq_domain_alloc_descs().

With this change, the virtqueues are correctly dispatched between the CPUs
on pseries.

Fixes: e75eafb9b039 ("genirq/msi: Switch to new irq spreading infrastructure")
Signed-off-by: Laurent Vivier <lvivier@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Greg Kurz <groug@...d.org>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20201126082852.1178497-3-lvivier@redhat.com
---
 arch/powerpc/platforms/pseries/msi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index 133f6ad..b3ac245 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -458,7 +458,8 @@ again:
 			return hwirq;
 		}

-		virq = irq_create_mapping(NULL, hwirq);
+		virq = irq_create_mapping_affinity(NULL, hwirq,
+						   entry->affinity);

 		if (!virq) {
 			pr_debug("rtas_msi: Failed mapping hwirq %d\n", hwirq);