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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-03-06 16:03:47 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-03-08 13:06:42 +0300 |
| commit | acd26bcf362708594ea081ef55140e37d0854ed2 (patch) | |
| tree | ea4be8a0c4a40b41ef1ee936868f0cde3a8863d2 /kernel/irq/Kconfig | |
| parent | da90921acc62c71d27729ae211ccfda5370bf75b (diff) | |
| download | linux-acd26bcf362708594ea081ef55140e37d0854ed2.tar.xz | |
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/Kconfig')
| -rw-r--r-- | kernel/irq/Kconfig | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index f92d9a687372..20d501af4f2e 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -43,6 +43,10 @@ config GENERIC_IRQ_MIGRATION config AUTO_IRQ_AFFINITY bool +# Interrupt injection mechanism +config GENERIC_IRQ_INJECTION + bool + # Tasklet based software resend for pending interrupts on enable_irq() config HARDIRQS_SW_RESEND bool @@ -127,6 +131,7 @@ config SPARSE_IRQ config GENERIC_IRQ_DEBUGFS bool "Expose irq internals in debugfs" depends on DEBUG_FS + select GENERIC_IRQ_INJECTION default n ---help--- |