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authorLaurent Vivier <lvivier@redhat.com>2020-11-26 11:28:52 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-12-11 15:23:30 +0300
commit7eb514087cdda91134f7eed41a7407016e8c0483 (patch)
tree636d78c175a11d214962945a8ff5a9a1530699e5 /drivers/ptp
parent1f72986fc9df1e7f60b86ecc6fab57df512af907 (diff)
downloadlinux-7eb514087cdda91134f7eed41a7407016e8c0483.tar.xz
powerpc/pseries: Pass MSI affinity to irq_create_mapping()
commit 9ea69a55b3b9a71cded9726af591949c1138f235 upstream. 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@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20201126082852.1178497-3-lvivier@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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