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genirq/affinity: Add irq_update_affinity_desc()

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Add a function to allow the affinity of an interrupt be switched to
managed, such that interrupts allocated for platform devices may be
managed.

This new interface has certain limitations, and attempts to use it in the
following circumstances will fail:
- For when the kernel is configured for generic IRQ reservation mode (in
  config GENERIC_IRQ_RESERVATION_MODE). The reason being that it could
  conflict with managed vs. non-managed interrupt accounting.
- The interrupt is already started, which should not be the case during
  init
- The interrupt is already configured as managed, which means double init

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1606905417-183214-2-git-send-email-john.garry@huawei.com
This commit is contained in:
John Garry
2020-12-02 18:36:53 +08:00
committed by Marc Zyngier
parent 34dd263fce
commit 1d3aec8928
2 changed files with 78 additions and 0 deletions
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8
include/linux/interrupt.h
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@@ -352,6 +352,8 @@ extern int irq_can_set_affinity(unsigned int irq);
extern int irq_select_affinity(unsigned int irq);
extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
extern int irq_update_affinity_desc(unsigned int irq,
struct irq_affinity_desc *affinity);
extern int
irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
@@ -387,6 +389,12 @@ static inline int irq_set_affinity_hint(unsigned int irq,
return -EINVAL;
}
static inline int irq_update_affinity_desc(unsigned int irq,
struct irq_affinity_desc *affinity)
{
return -EINVAL;
}
static inline int
irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
{