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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/Kconfig
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/Kconfig')
-rw-r--r--kernel/irq/Kconfig5
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---