Commit-ID: 64f3bf2f85c5690228200d6b94eb6847049af70d Gitweb: http://git.kernel.org/tip/64f3bf2f85c5690228200d6b94eb6847049af70d Author: Sebastian Andrzej Siewior <bige...@linutronix.de> AuthorDate: Tue, 6 Sep 2016 19:04:47 +0200 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Mon, 19 Sep 2016 21:44:29 +0200
ACPI/processor: Convert to hotplug state machine Install the callbacks via the state machine. Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de> Acked-by: "Rafael J. Wysocki" <r...@rjwysocki.net> Cc: Peter Zijlstra <pet...@infradead.org> Cc: linux-a...@vger.kernel.org Cc: r...@linutronix.de Cc: Len Brown <l...@kernel.org> Link: http://lkml.kernel.org/r/20160906170457.32393-12-bige...@linutronix.de Signed-off-by: Thomas Gleixner <t...@linutronix.de> --- drivers/acpi/processor_driver.c | 91 +++++++++++++++++++------------------ drivers/acpi/processor_throttling.c | 4 +- include/acpi/processor.h | 4 +- include/linux/cpuhotplug.h | 1 + 4 files changed, 52 insertions(+), 48 deletions(-) diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 0553aee..13e5ac4 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); } diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c index c72e648..d51ca1c 100644 --- a/drivers/acpi/processor_throttling.c +++ b/drivers/acpi/processor_throttling.c @@ -375,11 +375,11 @@ int acpi_processor_tstate_has_changed(struct acpi_processor *pr) * 3. TSD domain */ void acpi_processor_reevaluate_tstate(struct acpi_processor *pr, - unsigned long action) + bool is_dead) { int result = 0; - if (action == CPU_DEAD) { + if (is_dead) { /* When one CPU is offline, the T-state throttling * will be invalidated. */ diff --git a/include/acpi/processor.h b/include/acpi/processor.h index bfe6b2e..f3db11c 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -359,7 +359,7 @@ extern int acpi_processor_set_throttling(struct acpi_processor *pr, * onlined/offlined. In such case the flags.throttling will be updated. */ extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr, - unsigned long action); + bool is_dead); extern const struct file_operations acpi_processor_throttling_fops; extern void acpi_processor_throttling_init(void); #else @@ -380,7 +380,7 @@ static inline int acpi_processor_set_throttling(struct acpi_processor *pr, } static inline void acpi_processor_reevaluate_tstate(struct acpi_processor *pr, - unsigned long action) {} + bool is_dead) {} static inline void acpi_processor_throttling_init(void) {} #endif /* CONFIG_ACPI_CPU_FREQ_PSS */ diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index e7146ee..7706987 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -25,6 +25,7 @@ enum cpuhp_state { CPUHP_IRQ_POLL_DEAD, CPUHP_BLOCK_SOFTIRQ_DEAD, CPUHP_VIRT_SCSI_DEAD, + CPUHP_ACPI_CPUDRV_DEAD, CPUHP_WORKQUEUE_PREP, CPUHP_POWER_NUMA_PREPARE, CPUHP_HRTIMERS_PREPARE,
