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Tue, 24 Nov 2020 20:03:25 +0000 (UTC) Received: from thinkpad.redhat.com (ovpn-113-83.ams2.redhat.com [10.36.113.83]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9E5D15D6AB; Tue, 24 Nov 2020 20:03:21 +0000 (UTC) From: Laurent Vivier To: linux-kernel@vger.kernel.org Subject: [PATCH 2/2] powerpc/pseries: pass MSI affinity to irq_create_mapping() Date: Tue, 24 Nov 2020 21:03:08 +0100 Message-Id: <20201124200308.1110744-3-lvivier@redhat.com> In-Reply-To: <20201124200308.1110744-1-lvivier@redhat.com> References: <20201124200308.1110744-1-lvivier@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Marc Zyngier , "Michael S . Tsirkin" , linux-pci@vger.kernel.org, linux-block@vger.kernel.org, Paul Mackerras , Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, Christoph Hellwig Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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. This problem cannot be shown on x86_64 for two reasons: - the call path traverses arch_setup_msi_irqs() that is arch specific: virtscsi_probe() virtscsi_init() vp_modern_find_vqs() vp_find_vqs() vp_find_vqs_msix() pci_alloc_irq_vectors_affinity() __pci_enable_msix_range() pci_msi_setup_msi_irqs() arch_setup_msi_irqs() rtas_setup_msi_irqs() irq_create_mapping() irq_domain_alloc_descs() __irq_alloc_descs() - and x86_64 has CONFIG_PCI_MSI_IRQ_DOMAIN that uses another path: virtscsi_probe() virtscsi_init() vp_modern_find_vqs() vp_find_vqs() vp_find_vqs_msix() pci_alloc_irq_vectors_affinity() __pci_enable_msix_range() __msi_domain_alloc_irqs() __irq_domain_alloc_irqs() __irq_alloc_descs() Signed-off-by: Laurent Vivier --- arch/powerpc/platforms/pseries/msi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c index 42ba08eaea91..58197f92c6a2 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -458,7 +458,7 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type) return hwirq; } - virq = irq_create_mapping(NULL, hwirq, NULL); + virq = irq_create_mapping(NULL, hwirq, entry->affinity); if (!virq) { pr_debug("rtas_msi: Failed mapping hwirq %d\n", hwirq); -- 2.28.0