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author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-09-06 19:04:47 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-19 21:44:29 +0200 |
commit | 64f3bf2f85c5690228200d6b94eb6847049af70d (patch) | |
tree | 990cfb922d23bce508972f0dd9899766a2572544 /drivers/acpi/processor_driver.c | |
parent | virtio scsi: Convert to hotplug state machine (diff) | |
download | linux-64f3bf2f85c5690228200d6b94eb6847049af70d.tar.xz linux-64f3bf2f85c5690228200d6b94eb6847049af70d.zip |
ACPI/processor: Convert to hotplug state machine
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-acpi@vger.kernel.org
Cc: rt@linutronix.de
Cc: Len Brown <lenb@kernel.org>
Link: http://lkml.kernel.org/r/20160906170457.32393-12-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/acpi/processor_driver.c')
-rw-r--r-- | drivers/acpi/processor_driver.c | 91 |
1 files changed, 47 insertions, 44 deletions
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 0553aeebb228..13e5ac415abf 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -110,55 +110,46 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) static int __acpi_processor_start(struct acpi_device *device); -static int acpi_cpu_soft_notify(struct notifier_block *nfb, - unsigned long action, void *hcpu) +static int acpi_soft_cpu_online(unsigned int cpu) { - unsigned int cpu = (unsigned long)hcpu; struct acpi_processor *pr = per_cpu(processors, cpu); struct acpi_device *device; - action &= ~CPU_TASKS_FROZEN; - - switch (action) { - case CPU_ONLINE: - case CPU_DEAD: - break; - default: - return NOTIFY_DONE; - } if (!pr || acpi_bus_get_device(pr->handle, &device)) - return NOTIFY_DONE; - - if (action == CPU_ONLINE) { - /* - * CPU got physically hotplugged and onlined for the first time: - * Initialize missing things. - */ - if (pr->flags.need_hotplug_init) { - int ret; - - pr_info("Will online and init hotplugged CPU: %d\n", - pr->id); - pr->flags.need_hotplug_init = 0; - ret = __acpi_processor_start(device); - WARN(ret, "Failed to start CPU: %d\n", pr->id); - } else { - /* Normal CPU soft online event. */ - acpi_processor_ppc_has_changed(pr, 0); - acpi_processor_hotplug(pr); - acpi_processor_reevaluate_tstate(pr, action); - acpi_processor_tstate_has_changed(pr); - } - } else if (action == CPU_DEAD) { - /* Invalidate flag.throttling after the CPU is offline. */ - acpi_processor_reevaluate_tstate(pr, action); + return 0; + /* + * CPU got physically hotplugged and onlined for the first time: + * Initialize missing things. + */ + if (pr->flags.need_hotplug_init) { + int ret; + + pr_info("Will online and init hotplugged CPU: %d\n", + pr->id); + pr->flags.need_hotplug_init = 0; + ret = __acpi_processor_start(device); + WARN(ret, "Failed to start CPU: %d\n", pr->id); + } else { + /* Normal CPU soft online event. */ + acpi_processor_ppc_has_changed(pr, 0); + acpi_processor_hotplug(pr); + acpi_processor_reevaluate_tstate(pr, false); + acpi_processor_tstate_has_changed(pr); } - return NOTIFY_OK; + return 0; } -static struct notifier_block acpi_cpu_notifier = { - .notifier_call = acpi_cpu_soft_notify, -}; +static int acpi_soft_cpu_dead(unsigned int cpu) +{ + struct acpi_processor *pr = per_cpu(processors, cpu); + struct acpi_device *device; + + if (!pr || acpi_bus_get_device(pr->handle, &device)) + return 0; + + acpi_processor_reevaluate_tstate(pr, true); + return 0; +} #ifdef CONFIG_ACPI_CPU_FREQ_PSS static int acpi_pss_perf_init(struct acpi_processor *pr, @@ -303,7 +294,7 @@ static int acpi_processor_stop(struct device *dev) * This is needed for the powernow-k8 driver, that works even without * ACPI, but needs symbols from this driver */ - +static enum cpuhp_state hp_online; static int __init acpi_processor_driver_init(void) { int result = 0; @@ -315,11 +306,22 @@ static int __init acpi_processor_driver_init(void) if (result < 0) return result; - register_hotcpu_notifier(&acpi_cpu_notifier); + result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "acpi/cpu-drv:online", + acpi_soft_cpu_online, NULL); + if (result < 0) + goto err; + hp_online = result; + cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead", + NULL, acpi_soft_cpu_dead); + acpi_thermal_cpufreq_init(); acpi_processor_ppc_init(); acpi_processor_throttling_init(); return 0; +err: + driver_unregister(&acpi_processor_driver); + return result; } static void __exit acpi_processor_driver_exit(void) @@ -329,7 +331,8 @@ static void __exit acpi_processor_driver_exit(void) acpi_processor_ppc_exit(); acpi_thermal_cpufreq_exit(); - unregister_hotcpu_notifier(&acpi_cpu_notifier); + cpuhp_remove_state_nocalls(hp_online); + cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD); driver_unregister(&acpi_processor_driver); } |