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authorStephen Boyd <sboyd@codeaurora.org>2013-10-31 05:21:09 +0400
committerKumar Gala <galak@codeaurora.org>2014-02-12 01:00:37 +0400
commit6c3ff8b11a16ec69199ab85b74a5fae6d9c59db7 (patch)
tree79bf0dffed2a312578dd2a75048f6d65d21a6e8d /arch/arm/include/asm/smp.h
parentcf1e8f0cd665e2a9966d2bee4e11ecc0938ff166 (diff)
downloadlinux-6c3ff8b11a16ec69199ab85b74a5fae6d9c59db7.tar.xz
ARM: Introduce CPU_METHOD_OF_DECLARE() for cpu hotplug/smp
The goal of multi-platform kernels is to remove the need for mach directories and machine descriptors. To further that goal, introduce CPU_METHOD_OF_DECLARE() to allow cpu hotplug/smp support to be separated from the machine descriptors. Implementers should specify an enable-method property in their cpus node and then implement a matching set of smp_ops in their hotplug/smp code, wiring it up with the CPU_METHOD_OF_DECLARE() macro. When the kernel is compiled we'll collect all the enable-method smp_ops into one section for use at boot. At boot time we'll look for an enable-method in each cpu node and try to match that against all known CPU enable methods in the kernel. If there are no enable-methods in the cpu nodes we fallback to the cpus node and try to use any enable-method found there. If that doesn't work we fall back to the old way of using the machine descriptor. Acked-by: Mark Rutland <mark.rutland@arm.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: <devicetree@vger.kernel.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Kumar Gala <galak@codeaurora.org>
Diffstat (limited to 'arch/arm/include/asm/smp.h')
-rw-r--r--arch/arm/include/asm/smp.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index 22a3b9b5d4a1..772435b08207 100644
--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -114,6 +114,15 @@ struct smp_operations {
#endif
};
+struct of_cpu_method {
+ const char *method;
+ struct smp_operations *ops;
+};
+
+#define CPU_METHOD_OF_DECLARE(name, _method, _ops) \
+ static const struct of_cpu_method __cpu_method_of_table_##name \
+ __used __section(__cpu_method_of_table) \
+ = { .method = _method, .ops = _ops }
/*
* set platform specific SMP operations
*/