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>
This commit is contained in:
Marc Zyngier 2016-04-11 09:57:52 +01:00 committed by Thomas Gleixner
parent 651e8b54ab
commit 222df54fd8
3 changed files with 30 additions and 1 deletions

View file

@ -530,6 +530,10 @@ static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *c
}
extern int irq_set_percpu_devid(unsigned int irq);
extern int irq_set_percpu_devid_partition(unsigned int irq,
const struct cpumask *affinity);
extern int irq_get_percpu_devid_partition(unsigned int irq,
struct cpumask *affinity);
extern void
__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,

View file

@ -66,6 +66,7 @@ struct irq_desc {
int threads_handled_last;
raw_spinlock_t lock;
struct cpumask *percpu_enabled;
const struct cpumask *percpu_affinity;
#ifdef CONFIG_SMP
const struct cpumask *affinity_hint;
struct irq_affinity_notify *affinity_notify;

View file

@ -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));