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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-06-20 01:37:52 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-06-22 18:21:25 +0200 |
| commit | d52dd44175bd27ad9d8e34a994fb80877c1f6d61 (patch) | |
| tree | d9418a898e1a4653d9ed83aac1e4f179640999c0 /include/linux/irq.h | |
| parent | c5cb83bb337c25caae995d992d1cdf9b317f83de (diff) | |
| download | lwn-d52dd44175bd27ad9d8e34a994fb80877c1f6d61.tar.gz lwn-d52dd44175bd27ad9d8e34a994fb80877c1f6d61.zip | |
genirq: Introduce IRQD_SINGLE_TARGET flag
Many interrupt chips allow only a single CPU as interrupt target. The core
code has no knowledge about that. That's unfortunate as it could avoid
trying to readd a newly online CPU to the effective affinity mask.
Add the status flag and the necessary accessors.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20170619235447.352343969@linutronix.de
Diffstat (limited to 'include/linux/irq.h')
| -rw-r--r-- | include/linux/irq.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 19cea6326599..00db35b61e9e 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -209,6 +209,7 @@ struct irq_data { * IRQD_IRQ_STARTED - Startup state of the interrupt * IRQD_MANAGED_SHUTDOWN - Interrupt was shutdown due to empty affinity * mask. Applies only to affinity managed irqs. + * IRQD_SINGLE_TARGET - IRQ allows only a single affinity target */ enum { IRQD_TRIGGER_MASK = 0xf, @@ -228,6 +229,7 @@ enum { IRQD_AFFINITY_MANAGED = (1 << 21), IRQD_IRQ_STARTED = (1 << 22), IRQD_MANAGED_SHUTDOWN = (1 << 23), + IRQD_SINGLE_TARGET = (1 << 24), }; #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) @@ -276,6 +278,20 @@ static inline bool irqd_is_level_type(struct irq_data *d) return __irqd_to_state(d) & IRQD_LEVEL; } +/* + * Must only be called of irqchip.irq_set_affinity() or low level + * hieararchy domain allocation functions. + */ +static inline void irqd_set_single_target(struct irq_data *d) +{ + __irqd_to_state(d) |= IRQD_SINGLE_TARGET; +} + +static inline bool irqd_is_single_target(struct irq_data *d) +{ + return __irqd_to_state(d) & IRQD_SINGLE_TARGET; +} + static inline bool irqd_is_wakeup_set(struct irq_data *d) { return __irqd_to_state(d) & IRQD_WAKEUP_STATE; |