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MIPS: Add arch generic CPU hotplug

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Each platform has to add support for CPU hotplugging itself by providing
suitable definitions for the cpu_disable and cpu_die of the smp_ops
methods and setting SYS_SUPPORTS_HOTPLUG_CPU.  A platform should only set
SYS_SUPPORTS_HOTPLUG_CPU once all it's smp_ops definitions have the
necessary changes.  This patch contains the changes to the dummy smp_ops
definition for uni-processor systems.

Parts of the code contributed by Cavium Inc.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
2009-06-23 10:00:31 +01:00
parent 4ac4aa5cc3
commit 1b2bc75c1b
7 changed files with 78 additions and 7 deletions
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4
arch/mips/include/asm/smp-ops.h
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@@ -26,6 +26,10 @@ struct plat_smp_ops {
void (*boot_secondary)(int cpu, struct task_struct *idle);
void (*smp_setup)(void);
void (*prepare_cpus)(unsigned int max_cpus);
#ifdef CONFIG_HOTPLUG_CPU
int (*cpu_disable)(void);
void (*cpu_die)(unsigned int cpu);
#endif
};
extern void register_smp_ops(struct plat_smp_ops *ops);

19
arch/mips/include/asm/smp.h
View File

@@ -41,6 +41,7 @@ extern int __cpu_logical_map[NR_CPUS];
/* Octeon - Tell another core to flush its icache */
#define SMP_ICACHE_FLUSH 0x4
extern cpumask_t cpu_callin_map;
extern void asmlinkage smp_bootstrap(void);
@@ -56,6 +57,24 @@ static inline void smp_send_reschedule(int cpu)
mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
}
#ifdef CONFIG_HOTPLUG_CPU
static inline int __cpu_disable(void)
{
extern struct plat_smp_ops *mp_ops; /* private */
return mp_ops->cpu_disable();
}
static inline void __cpu_die(unsigned int cpu)
{
extern struct plat_smp_ops *mp_ops; /* private */
mp_ops->cpu_die(cpu);
}
extern void play_dead(void);
#endif
extern asmlinkage void smp_call_function_interrupt(void);
extern void arch_send_call_function_single_ipi(int cpu);