787047eea2
Writes to /sys/.../cpuX/online fail if we determine the platform doesn't support hotplug for that CPU. Furthermore, if the cpu_die op isn't specified the system hangs when we try to offline a CPU and it comes right back online unexpectedly. Let's figure this stuff out before we make the sysfs nodes so that the online file doesn't even exist if it isn't (at least sometimes) possible to hotplug the CPU. Add a new 'cpu_can_disable' op and repoint all 'cpu_disable' implementations at it because all implementers use the op to indicate if a CPU can be hotplugged or not in a static fashion. With PSCI we may need to add a 'cpu_disable' op so that the secure OS can be migrated off the CPU we're trying to hotplug. In this case, the 'cpu_can_disable' op will indicate that all CPUs are hotpluggable by returning true, but the 'cpu_disable' op will make a PSCI migration call and occasionally fail, denying the hotplug of a CPU. This shouldn't be any worse than x86 where we may indicate that all CPUs are hotpluggable but occasionally we can't offline a CPU due to check_irq_vectors_for_cpu_disable() failing to find a CPU to move vectors to. Cc: Mark Rutland <mark.rutland@arm.com> Cc: Nicolas Pitre <nico@linaro.org> Cc: Dave Martin <Dave.Martin@arm.com> Acked-by: Simon Horman <horms@verge.net.au> [shmobile portion] Tested-by: Simon Horman <horms@verge.net.au> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: <linux-sh@vger.kernel.org> Tested-by: Tyler Baker <tyler.baker@linaro.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
#ifndef __ARCH_MACH_COMMON_H
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#define __ARCH_MACH_COMMON_H
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extern void shmobile_earlytimer_init(void);
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extern void shmobile_init_delay(void);
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struct twd_local_timer;
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extern void shmobile_setup_console(void);
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extern void shmobile_boot_vector(void);
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extern unsigned long shmobile_boot_fn;
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extern unsigned long shmobile_boot_arg;
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extern unsigned long shmobile_boot_size;
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extern void shmobile_smp_boot(void);
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extern void shmobile_smp_sleep(void);
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extern void shmobile_smp_hook(unsigned int cpu, unsigned long fn,
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unsigned long arg);
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extern bool shmobile_smp_cpu_can_disable(unsigned int cpu);
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extern void shmobile_boot_scu(void);
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extern void shmobile_smp_scu_prepare_cpus(unsigned int max_cpus);
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extern void shmobile_smp_scu_cpu_die(unsigned int cpu);
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extern int shmobile_smp_scu_cpu_kill(unsigned int cpu);
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struct clk;
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extern int shmobile_clk_init(void);
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extern struct platform_suspend_ops shmobile_suspend_ops;
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#ifdef CONFIG_SUSPEND
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int shmobile_suspend_init(void);
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void shmobile_smp_apmu_suspend_init(void);
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#else
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static inline int shmobile_suspend_init(void) { return 0; }
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static inline void shmobile_smp_apmu_suspend_init(void) { }
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#endif
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#ifdef CONFIG_CPU_FREQ
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int shmobile_cpufreq_init(void);
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#else
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static inline int shmobile_cpufreq_init(void) { return 0; }
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#endif
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extern void __iomem *shmobile_scu_base;
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static inline void __init shmobile_init_late(void)
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{
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shmobile_suspend_init();
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shmobile_cpufreq_init();
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}
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#endif /* __ARCH_MACH_COMMON_H */
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