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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-03-06 14:03:47 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-03-08 11:06:42 +0100 |
| commit | acd26bcf362708594ea081ef55140e37d0854ed2 (patch) | |
| tree | ea4be8a0c4a40b41ef1ee936868f0cde3a8863d2 /include | |
| parent | da90921acc62c71d27729ae211ccfda5370bf75b (diff) | |
| download | linux-stable-acd26bcf362708594ea081ef55140e37d0854ed2.tar.gz linux-stable-acd26bcf362708594ea081ef55140e37d0854ed2.tar.bz2 linux-stable-acd26bcf362708594ea081ef55140e37d0854ed2.zip | |
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 'include')
| -rw-r--r-- | include/linux/interrupt.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index c5fe60ec6b84..80f637c3a6f3 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -248,6 +248,8 @@ extern void enable_percpu_nmi(unsigned int irq, unsigned int type); extern int prepare_percpu_nmi(unsigned int irq); extern void teardown_percpu_nmi(unsigned int irq); +extern int irq_inject_interrupt(unsigned int irq); + /* The following three functions are for the core kernel use only. */ extern void suspend_device_irqs(void); extern void resume_device_irqs(void); |