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genirq: irqchip: Add mask to block out invalid irqs

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Some controllers have irqs that aren't wired up and must never be used.
For the generic chip attached to an irq_domain this provides a mask that
can be used to block out particular irqs so that they never get mapped.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Link: http://lkml.kernel.org/r/1369793454-19197-2-git-send-email-grant.likely@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Grant Likely 2013-05-29 03:10:52 +01:00 committed by Thomas Gleixner
parent 088f40b7b0
commit e8bd834f73
2 changed files with 5 additions and 0 deletions
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2
include/linux/irq.h
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@ -679,6 +679,7 @@ struct irq_chip_type {
* @num_ct: Number of available irq_chip_type instances (usually 1)
* @private: Private data for non generic chip callbacks
* @installed: bitfield to denote installed interrupts
* @unused: bitfield to denote unused interrupts
* @domain: irq domain pointer
* @list: List head for keeping track of instances
* @chip_types: Array of interrupt irq_chip_types
@ -702,6 +703,7 @@ struct irq_chip_generic {
unsigned int num_ct;
void *private;
unsigned long installed;
unsigned long unused;
struct irq_domain *domain;
struct list_head list;
struct irq_chip_type chip_types[0];

3
kernel/irq/generic-chip.c
View file

@ -359,6 +359,9 @@ static int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
idx = hw_irq % dgc->irqs_per_chip;
if (test_bit(idx, &gc->unused))
return -ENOTSUPP;
if (test_bit(idx, &gc->installed))
return -EBUSY;