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authorThomas Gleixner <tglx@linutronix.de>2017-06-20 02:37:52 +0300
committerThomas Gleixner <tglx@linutronix.de>2017-06-22 19:21:25 +0300
commitd52dd44175bd27ad9d8e34a994fb80877c1f6d61 (patch)
treed9418a898e1a4653d9ed83aac1e4f179640999c0 /include/linux/irq.h
parentc5cb83bb337c25caae995d992d1cdf9b317f83de (diff)
downloadlinux-d52dd44175bd27ad9d8e34a994fb80877c1f6d61.tar.xz
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.h16
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;