diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-07-29 23:51:48 +0200 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2021-08-26 08:36:40 -0400 |
| commit | cab824f67d7e8f68288d615929dec02607e473ad (patch) | |
| tree | b0a7d1edc1b02b29fc384723a451d85ce10a2989 /include/linux | |
| parent | 0b926fdfca71898027ee05aeaea9b9209fdc1f9f (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 'include/linux')
| -rw-r--r-- | include/linux/irq.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index a042faefb9b7..9504267414a4 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -535,6 +535,7 @@ struct irq_chip { * IRQCHIP_ONESHOT_SAFE: One shot does not require mask/unmask * IRQCHIP_EOI_THREADED: Chip requires eoi() on unmask in threaded mode * IRQCHIP_SUPPORTS_LEVEL_MSI Chip can provide two doorbells for Level MSIs + * IRQCHIP_AFFINITY_PRE_STARTUP: Default affinity update before startup */ enum { IRQCHIP_SET_TYPE_MASKED = (1 << 0), @@ -545,6 +546,7 @@ enum { IRQCHIP_ONESHOT_SAFE = (1 << 5), IRQCHIP_EOI_THREADED = (1 << 6), IRQCHIP_SUPPORTS_LEVEL_MSI = (1 << 7), + IRQCHIP_AFFINITY_PRE_STARTUP = (1 << 10), }; #include <linux/irqdesc.h> |