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authorJulien Thierry <julien.thierry@arm.com>2019-01-31 14:53:58 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2019-02-05 14:36:57 +0000
commitb525903c254dab2491410f0f23707691b7c2c317 (patch)
tree11bad762c8aae79bfa042e47d263362f8d288b20 /kernel/irq/internals.h
parent49a57857aeea06ca831043acbb0fa5e0f50602fd (diff)
downloadlinux-stericsson-b525903c254dab2491410f0f23707691b7c2c317.tar.gz
genirq: Provide basic NMI management for interrupt lines
Add functionality to allocate interrupt lines that will deliver IRQs as Non-Maskable Interrupts. These allocations are only successful if the irqchip provides the necessary support and allows NMI delivery for the interrupt line. Interrupt lines allocated for NMI delivery must be enabled/disabled through enable_nmi/disable_nmi_nosync to keep their state consistent. To treat a PERCPU IRQ as NMI, the interrupt must not be shared nor threaded, the irqchip directly managing the IRQ must be the root irqchip and the irqchip cannot be behind a slow bus. Signed-off-by: Julien Thierry <julien.thierry@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'kernel/irq/internals.h')
-rw-r--r--kernel/irq/internals.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index ca6afa267070..2a77cdd27ca9 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -49,6 +49,7 @@ enum {
* IRQS_WAITING - irq is waiting
* IRQS_PENDING - irq is pending and replayed later
* IRQS_SUSPENDED - irq is suspended
+ * IRQS_NMI - irq line is used to deliver NMIs
*/
enum {
IRQS_AUTODETECT = 0x00000001,
@@ -60,6 +61,7 @@ enum {
IRQS_PENDING = 0x00000200,
IRQS_SUSPENDED = 0x00000800,
IRQS_TIMINGS = 0x00001000,
+ IRQS_NMI = 0x00002000,
};
#include "debug.h"