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| author | Laurent Vivier <lvivier@redhat.com> | 2020-11-26 09:28:52 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-11-30 12:22:04 +0100 |
| commit | 9ea69a55b3b9a71cded9726af591949c1138f235 (patch) | |
| tree | 43ab1128ed0503ef9e4b828a9e740f4418d2e1b8 /arch | |
| parent | bb4c6910c8b41623104c2e64a30615682689a54d (diff) | |
| download | linux-stable-9ea69a55b3b9a71cded9726af591949c1138f235.tar.gz linux-stable-9ea69a55b3b9a71cded9726af591949c1138f235.tar.bz2 linux-stable-9ea69a55b3b9a71cded9726af591949c1138f235.zip | |
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@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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/pseries/msi.c | 3 |
1 files changed, 2 insertions, 1 deletions
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 @@ 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); |