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authorThomas Gleixner <tglx@linutronix.de>2017-06-20 01:37:49 +0200
committerThomas Gleixner <tglx@linutronix.de>2017-06-22 18:21:24 +0200
commit4cde9c6b826834b861a2b58653ab33150f562064 (patch)
tree4158f9e537804b8a1caf53c0c0af813265809838 /kernel/irq/internals.h
parent708d174b6c32bffc5d73793bc7a267bcafeb6558 (diff)
downloadlinux-stericsson-4cde9c6b826834b861a2b58653ab33150f562064.tar.gz
genirq: Add force argument to irq_startup()
In order to handle managed interrupts gracefully on irq_startup() so they won't lose their assigned affinity, it's necessary to allow startups which keep the interrupts in managed shutdown state, if none of the assigend CPUs is online. This allows drivers to request interrupts w/o the CPUs being online, which avoid online/offline churn in drivers. Add a force argument which can override that decision and let only request_irq() and enable_irq() allow the managed shutdown handling. enable_irq() is required, because the interrupt might be requested with IRQF_NOAUTOEN and enable_irq() invokes irq_startup() which would then wreckage the assignment again. All other callers force startup and potentially break the assigned affinity. No functional change as this only adds the function argument. 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/20170619235447.112094565@linutronix.de
Diffstat (limited to 'kernel/irq/internals.h')
-rw-r--r--kernel/irq/internals.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index ca4666b4cd39..5fd105e252c3 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -66,7 +66,14 @@ extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
extern void __disable_irq(struct irq_desc *desc);
extern void __enable_irq(struct irq_desc *desc);
-extern int irq_startup(struct irq_desc *desc, bool resend);
+#define IRQ_RESEND true
+#define IRQ_NORESEND false
+
+#define IRQ_START_FORCE true
+#define IRQ_START_COND false
+
+extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
+
extern void irq_shutdown(struct irq_desc *desc);
extern void irq_enable(struct irq_desc *desc);
extern void irq_disable(struct irq_desc *desc);