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authorMark Rutland <mark.rutland@arm.com>2013-10-24 21:30:18 +0200
committerCatalin Marinas <catalin.marinas@arm.com>2013-10-25 12:33:21 +0200
commit9327e2c6bb8cb0131b38a07847cd58c78dc095e9 (patch)
treea326739547f5521d1c1b2d228081f52466609e6c /arch/arm64/include
parentarm64: read enable-method for CPU0 (diff)
downloadlinux-9327e2c6bb8cb0131b38a07847cd58c78dc095e9.tar.xz
linux-9327e2c6bb8cb0131b38a07847cd58c78dc095e9.zip
arm64: add CPU_HOTPLUG infrastructure
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>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r--arch/arm64/include/asm/cpu_ops.h9
-rw-r--r--arch/arm64/include/asm/irq.h1
-rw-r--r--arch/arm64/include/asm/smp.h5
3 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h
index 1a98dbfc4a5f..c4cdb5e5b73d 100644
--- a/arch/arm64/include/asm/cpu_ops.h
+++ b/arch/arm64/include/asm/cpu_ops.h
@@ -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];
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
index 0332fc077f6e..e1f7ecdde11f 100644
--- a/arch/arm64/include/asm/irq.h
+++ b/arch/arm64/include/asm/irq.h
@@ -4,6 +4,7 @@
#include <asm-generic/irq.h>
extern void (*handle_arch_irq)(struct pt_regs *);
+extern void migrate_irqs(void);
extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
#endif
diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
index d64187ce69a2..a498f2cd2c2a 100644
--- a/arch/arm64/include/asm/smp.h
+++ b/arch/arm64/include/asm/smp.h
@@ -65,4 +65,9 @@ extern void secondary_entry(void);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
+extern int __cpu_disable(void);
+
+extern void __cpu_die(unsigned int cpu);
+extern void cpu_die(void);
+
#endif /* ifndef __ASM_SMP_H */