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authorThomas Gleixner <tglx@linutronix.de>2020-03-06 14:03:47 +0100
committerThomas Gleixner <tglx@linutronix.de>2020-03-08 11:06:42 +0100
commitacd26bcf362708594ea081ef55140e37d0854ed2 (patch)
treeea4be8a0c4a40b41ef1ee936868f0cde3a8863d2 /kernel/irq/internals.h
parentda90921acc62c71d27729ae211ccfda5370bf75b (diff)
downloadlinux-stericsson-acd26bcf362708594ea081ef55140e37d0854ed2.tar.gz
genirq: Provide interrupt injection mechanism
Error injection mechanisms need a half ways safe way to inject interrupts as invoking generic_handle_irq() or the actual device interrupt handler directly from e.g. a debugfs write is not guaranteed to be safe. On x86 generic_handle_irq() is unsafe due to the hardware trainwreck which is the base of x86 interrupt delivery and affinity management. Move the irq debugfs injection code into a separate function which can be used by error injection code as well. The implementation prevents at least that state is corrupted, but it cannot close a very tiny race window on x86 which might result in a stale and not serviced device interrupt under very unlikely circumstances. This is explicitly for debugging and testing and not for production use or abuse in random driver code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lkml.kernel.org/r/20200306130623.990928309@linutronix.de
Diffstat (limited to 'kernel/irq/internals.h')
-rw-r--r--kernel/irq/internals.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 8980859bdf1e..7db284b10ac9 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -108,7 +108,7 @@ irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
irqreturn_t handle_irq_event(struct irq_desc *desc);
/* Resending of interrupts :*/
-int check_irq_resend(struct irq_desc *desc);
+int check_irq_resend(struct irq_desc *desc, bool inject);
bool irq_wait_for_poll(struct irq_desc *desc);
void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);