Messages in this thread | | | From | David Decotigny <> | Date | Mon, 7 Mar 2022 17:34:12 -0800 | Subject | Re: [PATCH] genirq/msi: Shutdown managed interrupts with unsatifiable affinities |
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On Mon, Mar 7, 2022 at 11:06 AM Marc Zyngier <maz@kernel.org> wrote: > > When booting with maxcpus=<small number>, interrupt controllers > such as the GICv3 ITS may not be able to satisfy the affinity of > some managed interrupts, as some of the HW resources are simply > not available. > > In order to deal with this, do not try to activate such interrupt > if there is no online CPU capable of handling it. Instead, place > it in shutdown state. Once a capable CPU shows up, it will be > activated. > > Reported-by: John Garry <john.garry@huawei.com> > Reported-by: David Decotigny <ddecotig@google.com> > Signed-off-by: Marc Zyngier <maz@kernel.org> > --- > kernel/irq/msi.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c > index 2bdfce5edafd..aa84ce84c2ec 100644 > --- a/kernel/irq/msi.c > +++ b/kernel/irq/msi.c > @@ -818,6 +818,18 @@ static int msi_init_virq(struct irq_domain *domain, int virq, unsigned int vflag > irqd_clr_can_reserve(irqd); > if (vflags & VIRQ_NOMASK_QUIRK) > irqd_set_msi_nomask_quirk(irqd); > + > + /* > + * If the interrupt is managed but no CPU is available > + * to service it, shut it down until better times. > + */ > + if ((vflags & VIRQ_ACTIVATE) && > + irqd_affinity_is_managed(irqd) && > + !cpumask_intersects(irq_data_get_affinity_mask(irqd), > + cpu_online_mask)) { > + irqd_set_managed_shutdown(irqd); > + return 0; > + } > } > > if (!(vflags & VIRQ_ACTIVATE)) > -- > 2.30.2 >
Thanks! I tried that patch, and it worked for us.
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