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| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-04-11 09:57:52 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-05-02 13:42:51 +0200 |
| commit | 222df54fd8b7641dcc81476f157806bb3144ee1d (patch) | |
| tree | 2153984fd6a2acc0f70022e95ca7f1f2a66dc098 /kernel/irq | |
| parent | 651e8b54abdeeaa36f5f54ffa05c18707a3cc1d0 (diff) | |
| download | linux-222df54fd8b7641dcc81476f157806bb3144ee1d.tar.gz linux-222df54fd8b7641dcc81476f157806bb3144ee1d.tar.bz2 linux-222df54fd8b7641dcc81476f157806bb3144ee1d.zip | |
genirq: Allow the affinity of a percpu interrupt to be set/retrieved
In order to prepare the genirq layer for the concept of partitionned
percpu interrupts, let's allow an affinity to be associated with
such an interrupt. We introduce:
- irq_set_percpu_devid_partition: flag an interrupt as a percpu-devid
interrupt, and associate it with an affinity
- irq_get_percpu_devid_partition: allow the affinity of that interrupt
to be retrieved.
This will allow a driver to discover which CPUs the per-cpu interrupt
can actually fire on.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Link: http://lkml.kernel.org/r/1460365075-7316-3-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/irqdesc.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 0ccd028817d7..8731e1c5d1e7 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -595,7 +595,8 @@ void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus) chip_bus_sync_unlock(desc); } -int irq_set_percpu_devid(unsigned int irq) +int irq_set_percpu_devid_partition(unsigned int irq, + const struct cpumask *affinity) { struct irq_desc *desc = irq_to_desc(irq); @@ -610,10 +611,33 @@ int irq_set_percpu_devid(unsigned int irq) if (!desc->percpu_enabled) return -ENOMEM; + if (affinity) + desc->percpu_affinity = affinity; + else + desc->percpu_affinity = cpu_possible_mask; + irq_set_percpu_devid_flags(irq); return 0; } +int irq_set_percpu_devid(unsigned int irq) +{ + return irq_set_percpu_devid_partition(irq, NULL); +} + +int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity) +{ + struct irq_desc *desc = irq_to_desc(irq); + + if (!desc || !desc->percpu_enabled) + return -EINVAL; + + if (affinity) + cpumask_copy(affinity, desc->percpu_affinity); + + return 0; +} + void kstat_incr_irq_this_cpu(unsigned int irq) { kstat_incr_irqs_this_cpu(irq_to_desc(irq)); |