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arm64: add CPU_HOTPLUG infrastructure

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This patch adds the basic infrastructure necessary to support
CPU_HOTPLUG on arm64, based on the arm implementation. Actual hotplug
support will depend on an implementation's cpu_operations (e.g. PSCI).

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Rutland
2013-10-24 20:30:18 +01:00
committed by Catalin Marinas
parent e8765b265a
commit 9327e2c6bb
8 changed files with 187 additions and 1 deletions
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9
arch/arm64/include/asm/cpu_ops.h
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@@ -34,6 +34,11 @@ struct device_node;
* @cpu_boot: Boots a cpu into the kernel.
* @cpu_postboot: Optionally, perform any post-boot cleanup or necesary
* synchronisation. Called from the cpu being booted.
* @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific
* reason, which will cause the hot unplug to be aborted. Called
* from the cpu to be killed.
* @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the
* cpu being killed.
*/
struct cpu_operations {
const char *name;
@@ -41,6 +46,10 @@ struct cpu_operations {
int (*cpu_prepare)(unsigned int);
int (*cpu_boot)(unsigned int);
void (*cpu_postboot)(void);
#ifdef CONFIG_HOTPLUG_CPU
int (*cpu_disable)(unsigned int cpu);
void (*cpu_die)(unsigned int cpu);
#endif
};
extern const struct cpu_operations *cpu_ops[NR_CPUS];