Commit-ID: d52dd44175bd27ad9d8e34a994fb80877c1f6d61 Gitweb: http://git.kernel.org/tip/d52dd44175bd27ad9d8e34a994fb80877c1f6d61 Author: Thomas Gleixner <t...@linutronix.de> AuthorDate: Tue, 20 Jun 2017 01:37:52 +0200 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Thu, 22 Jun 2017 18:21:25 +0200
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 <t...@linutronix.de> Cc: Jens Axboe <ax...@kernel.dk> Cc: Marc Zyngier <marc.zyng...@arm.com> Cc: Michael Ellerman <m...@ellerman.id.au> Cc: Keith Busch <keith.bu...@intel.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Christoph Hellwig <h...@lst.de> Link: http://lkml.kernel.org/r/20170619235447.352343...@linutronix.de --- include/linux/irq.h | 16 ++++++++++++++++ kernel/irq/debugfs.c | 1 + 2 files changed, 17 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 19cea63..00db35b 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; diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c index edbef25..dbd6e78 100644 --- a/kernel/irq/debugfs.c +++ b/kernel/irq/debugfs.c @@ -105,6 +105,7 @@ static const struct irq_bit_descr irqdata_states[] = { BIT_MASK_DESCR(IRQD_PER_CPU), BIT_MASK_DESCR(IRQD_NO_BALANCING), + BIT_MASK_DESCR(IRQD_SINGLE_TARGET), BIT_MASK_DESCR(IRQD_MOVE_PCNTXT), BIT_MASK_DESCR(IRQD_AFFINITY_SET), BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
