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authorAshwin Chaugule <ashwin.chaugule@linaro.org>2014-05-07 10:18:36 -0400
committerAshwin Chaugule <ashwin.chaugule@linaro.org>2014-05-15 10:16:30 -0400
commitc814ca029e1015bb0ecec312f4bb9751ba1a711a (patch)
tree75ff2a914c476700b4a2272c523416d7d4cb3328 /arch/arm64/include
parente1cd3b361a4f1dd323252543f40d43509d80affa (diff)
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')
-rw-r--r--arch/arm64/include/asm/cpu_ops.h2
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 15241307650..d7b4b38a8e8 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);