diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-07-29 23:51:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-18 08:59:15 +0200 |
| commit | 4e52a4fe6f445a59a88c7ba60dd253a3643f0589 (patch) | |
| tree | 70a38cf72d10b0c1926fcb860c3a4f67b89cf79d /kernel/irq | |
| parent | 2a28b52306f2d0797159b7e9819d4af3f0c4ef22 (diff) | |
genirq: Provide IRQCHIP_AFFINITY_PRE_STARTUP
commit 826da771291fc25a428e871f9e7fb465e390f852 upstream.
X86 IO/APIC and MSI interrupts (when used without interrupts remapping)
require that the affinity setup on startup is done before the interrupt is
enabled for the first time as the non-remapped operation mode cannot safely
migrate enabled interrupts from arbitrary contexts. Provide a new irq chip
flag which allows affected hardware to request this.
This has to be opt-in because there have been reports in the past that some
interrupt chips cannot handle affinity setting before startup.
Fixes: 18404756765c ("genirq: Expose default irq affinity mask (take 3)")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210729222542.779791738@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/chip.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index b9b9618e1aca..0b70811fd956 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -265,8 +265,11 @@ int irq_startup(struct irq_desc *desc, bool resend, bool force) } else { switch (__irq_startup_managed(desc, aff, force)) { case IRQ_STARTUP_NORMAL: + if (d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP) + irq_setup_affinity(desc); ret = __irq_startup(desc); - irq_setup_affinity(desc); + if (!(d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP)) + irq_setup_affinity(desc); break; case IRQ_STARTUP_MANAGED: irq_do_set_affinity(d, aff, false); |