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| author |   Ashwin Chaugule <ashwin.chaugule@linaro.org> | 2014-05-07 10:18:36 -0400 |
|---|---|---|
| committer | Ashwin Chaugule <ashwin.chaugule@linaro.org> | 2014-05-15 10:16:30 -0400 |
| commit | c814ca029e1015bb0ecec312f4bb9751ba1a711a (patch) | |
| tree | 75ff2a914c476700b4a2272c523416d7d4cb3328 /arch/arm64/include/asm/cpu_ops.h | |
| parent | Documentation: devicetree: Add new binding for PSCIv0.2 (diff) | |
| download | linux-dev-c814ca029e1015bb0ecec312f4bb9751ba1a711a.tar.xz linux-dev-c814ca029e1015bb0ecec312f4bb9751ba1a711a.zip | |
ARM: Check if a CPU has gone offline
PSCIv0.2 adds a new function called AFFINITY_INFO, which
can be used to query if a specified CPU has actually gone
offline. Calling this function via cpu_kill ensures that
a CPU has quiesced after a call to cpu_die. This helps
prevent the CPU from doing arbitrary bad things when data
or instructions are clobbered (as happens with kexec)
in the window between a CPU announcing that it is dead
and said CPU leaving the kernel.
Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpu_ops.h')
| -rw-r--r-- | arch/arm64/include/asm/cpu_ops.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h index 152413076503..d7b4b38a8e86 100644 --- a/arch/arm64/include/asm/cpu_ops.h +++ b/arch/arm64/include/asm/cpu_ops.h @@ -39,6 +39,7 @@ struct device_node; * from the cpu to be killed. * @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the * cpu being killed. + * @cpu_kill: Ensures a cpu has left the kernel. Called from another cpu. * @cpu_suspend: Suspends a cpu and saves the required context. May fail owing * to wrong parameters or error conditions. Called from the * CPU being suspended. Must be called with IRQs disabled. @@ -52,6 +53,7 @@ struct cpu_operations { #ifdef CONFIG_HOTPLUG_CPU int (*cpu_disable)(unsigned int cpu); void (*cpu_die)(unsigned int cpu); + int (*cpu_kill)(unsigned int cpu); #endif #ifdef CONFIG_ARM64_CPU_SUSPEND int (*cpu_suspend)(unsigned long); |