From: Laurent Vivier <lvivier@redhat.com> To: linux-kernel@vger.kernel.org Cc: linux-pci@vger.kernel.org, Christoph Hellwig <hch@lst.de>, Paul Mackerras <paulus@samba.org>, Greg Kurz <groug@kaod.org>, linuxppc-dev@lists.ozlabs.org, Thomas Gleixner <tglx@linutronix.de>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Michael Ellerman <mpe@ellerman.id.au>, linux-block@vger.kernel.org, "Michael S . Tsirkin" <mst@redhat.com>, Marc Zyngier <maz@kernel.org>, Laurent Vivier <lvivier@redhat.com> Subject: [PATCH v3 2/2] powerpc/pseries: pass MSI affinity to irq_create_mapping() Date: Wed, 25 Nov 2020 16:09:32 +0100 [thread overview] Message-ID: <20201125150932.1150619-3-lvivier@redhat.com> (raw) In-Reply-To: <20201125150932.1150619-1-lvivier@redhat.com> With virtio multiqueue, normally each queue IRQ is mapped to a CPU. But since commit 0d9f0a52c8b9f ("virtio_scsi: use virtio IRQ affinity") this is broken on pseries. 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. As the previous patch has added the affinity parameter to irq_create_mapping() we can forward the affinity from rtas_setup_msi_irqs() to irq_domain_alloc_descs(). With this change, the virtqueues are correctly dispatched between the CPUs on pseries. BugId: https://bugzilla.redhat.com/show_bug.cgi?id=1702939 Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> --- 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 133f6adcb39c..b3ac2455faad 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -458,7 +458,8 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type) 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); -- 2.28.0
WARNING: multiple messages have this Message-ID (diff)
From: Laurent Vivier <lvivier@redhat.com> To: linux-kernel@vger.kernel.org Cc: Laurent Vivier <lvivier@redhat.com>, Marc Zyngier <maz@kernel.org>, "Michael S . Tsirkin" <mst@redhat.com>, linux-pci@vger.kernel.org, Greg Kurz <groug@kaod.org>, linux-block@vger.kernel.org, Paul Mackerras <paulus@samba.org>, Thomas Gleixner <tglx@linutronix.de>, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig <hch@lst.de> Subject: [PATCH v3 2/2] powerpc/pseries: pass MSI affinity to irq_create_mapping() Date: Wed, 25 Nov 2020 16:09:32 +0100 [thread overview] Message-ID: <20201125150932.1150619-3-lvivier@redhat.com> (raw) In-Reply-To: <20201125150932.1150619-1-lvivier@redhat.com> With virtio multiqueue, normally each queue IRQ is mapped to a CPU. But since commit 0d9f0a52c8b9f ("virtio_scsi: use virtio IRQ affinity") this is broken on pseries. 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. As the previous patch has added the affinity parameter to irq_create_mapping() we can forward the affinity from rtas_setup_msi_irqs() to irq_domain_alloc_descs(). With this change, the virtqueues are correctly dispatched between the CPUs on pseries. BugId: https://bugzilla.redhat.com/show_bug.cgi?id=1702939 Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> --- 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 133f6adcb39c..b3ac2455faad 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -458,7 +458,8 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type) 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); -- 2.28.0
next prev parent reply other threads:[~2020-11-25 15:10 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-25 15:09 [PATCH v3 0/2] powerpc/pseries: fix MSI/X IRQ affinity on pseries Laurent Vivier 2020-11-25 15:09 ` Laurent Vivier 2020-11-25 15:09 ` [PATCH v3 1/2] genirq/irqdomain: Add an irq_create_mapping_affinity() function Laurent Vivier 2020-11-25 15:09 ` Laurent Vivier 2020-11-25 15:09 ` Laurent Vivier [this message] 2020-11-25 15:09 ` [PATCH v3 2/2] powerpc/pseries: pass MSI affinity to irq_create_mapping() Laurent Vivier 2020-11-25 16:05 ` Denis Kirjanov 2020-11-25 16:05 ` Denis Kirjanov 2020-11-25 16:24 ` Laurent Vivier 2020-11-25 16:24 ` Laurent Vivier 2020-11-25 16:42 ` Marc Zyngier 2020-11-25 16:42 ` Marc Zyngier 2020-11-25 17:34 ` Greg Kurz 2020-11-25 17:34 ` Greg Kurz 2020-11-26 3:22 ` Michael Ellerman 2020-11-26 3:22 ` Michael Ellerman 2020-11-26 3:22 ` Michael Ellerman 2020-11-26 3:22 ` Michael Ellerman
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