From 604d895857c2fc6748feb805c2290a60491eed43 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 12 Jun 2017 22:51:55 +0200 Subject: PM / sleep: Print timing information if debug is enabled Avoid printing the device suspend/resume timing information if CONFIG_PM_DEBUG is not set to reduce the log noise level. Signed-off-by: Rafael J. Wysocki --- drivers/base/power/main.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/base/power/main.c') diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 9faee1c893e5..253f860e8981 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -417,6 +417,7 @@ static void pm_dev_err(struct device *dev, pm_message_t state, char *info, dev_name(dev), pm_verb(state.event), info, error); } +#ifdef CONFIG_PM_DEBUG static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) { ktime_t calltime; @@ -433,6 +434,9 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) info ?: "", info ? " " : "", pm_verb(state.event), usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); } +#else +static inline void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) {} +#endif /* CONFIG_PM_DEBUG */ static int dpm_run_callback(pm_callback_t cb, struct device *dev, pm_message_t state, char *info) -- cgit v1.2.1 From 33e4f80ee69b5168badf37edbfed796eb48434b9 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 12 Jun 2017 22:56:34 +0200 Subject: ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle The ACPI SCI (System Control Interrupt) is set up as a wakeup IRQ during suspend-to-idle transitions and, consequently, any events signaled through it wake up the system from that state. However, on some systems some of the events signaled via the ACPI SCI while suspended to idle should not cause the system to wake up. In fact, quite often they should just be discarded. Arguably, systems should not resume entirely on such events, but in order to decide which events really should cause the system to resume and which are spurious, it is necessary to resume up to the point when ACPI SCIs are actually handled and processed, which is after executing dpm_resume_noirq() in the system resume path. For this reasons, add a loop around freeze_enter() in which the platforms can process events signaled via multiplexed IRQ lines like the ACPI SCI and add suspend-to-idle hooks that can be used for this purpose to struct platform_freeze_ops. In the ACPI case, the ->wake hook is used for checking if the SCI has triggered while suspended and deferring the interrupt-induced system wakeup until the events signaled through it are actually processed sufficiently to decide whether or not the system should resume. In turn, the ->sync hook allows all of the relevant event queues to be flushed so as to prevent events from being missed due to race conditions. In addition to that, some ACPI code processing wakeup events needs to be modified to use the "hard" version of wakeup triggers, so that it will cause a system resume to happen on device-induced wakeup events even if the "soft" mechanism to prevent the system from suspending is not enabled. However, to preserve the existing behavior with respect to suspend-to-RAM, this only is done in the suspend-to-idle case and only if an SCI has occurred while suspended. Signed-off-by: Rafael J. Wysocki --- drivers/base/power/main.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'drivers/base/power/main.c') diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 253f860e8981..ef5b6a6e5045 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1095,11 +1095,6 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a if (async_error) goto Complete; - if (pm_wakeup_pending()) { - async_error = -EBUSY; - goto Complete; - } - if (dev->power.syscore || dev->power.direct_complete) goto Complete; -- cgit v1.2.1 From 952856db9019f914227f5fbe24f7810e20fec0fd Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Mon, 12 Jun 2017 17:19:31 +0200 Subject: PM: Constify returned PM event name The pm_verb() returns a pointer to string from .rodata so it should be marked as const. Signed-off-by: Krzysztof Kozlowski Signed-off-by: Rafael J. Wysocki --- drivers/base/power/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/base/power/main.c') diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 9faee1c893e5..924a5ba7aa27 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -62,7 +62,7 @@ static pm_message_t pm_transition; static int async_error; -static char *pm_verb(int event) +static const char *pm_verb(int event) { switch (event) { case PM_EVENT_SUSPEND: -- cgit v1.2.1 From e3771fa98e266aba29211c624ecf01200be497ad Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Mon, 12 Jun 2017 17:19:32 +0200 Subject: PM: Constify info string used in messages The 'info' string appearing in many places points to a .rodata string so it should be passes as pointer to const. Signed-off-by: Krzysztof Kozlowski Signed-off-by: Rafael J. Wysocki --- drivers/base/power/main.c | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-) (limited to 'drivers/base/power/main.c') diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 924a5ba7aa27..6add28799f6d 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -208,7 +208,8 @@ static ktime_t initcall_debug_start(struct device *dev) } static void initcall_debug_report(struct device *dev, ktime_t calltime, - int error, pm_message_t state, char *info) + int error, pm_message_t state, + const char *info) { ktime_t rettime; s64 nsecs; @@ -403,21 +404,22 @@ static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t stat return NULL; } -static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) +static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info) { dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? ", may wakeup" : ""); } -static void pm_dev_err(struct device *dev, pm_message_t state, char *info, +static void pm_dev_err(struct device *dev, pm_message_t state, const char *info, int error) { printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", dev_name(dev), pm_verb(state.event), info, error); } -static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) +static void dpm_show_time(ktime_t starttime, pm_message_t state, + const char *info) { ktime_t calltime; u64 usecs64; @@ -435,7 +437,7 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) } static int dpm_run_callback(pm_callback_t cb, struct device *dev, - pm_message_t state, char *info) + pm_message_t state, const char *info) { ktime_t calltime; int error; @@ -535,7 +537,7 @@ static void dpm_watchdog_clear(struct dpm_watchdog *wd) static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) { pm_callback_t callback = NULL; - char *info = NULL; + const char *info = NULL; int error = 0; TRACE_DEVICE(dev); @@ -665,7 +667,7 @@ void dpm_resume_noirq(pm_message_t state) static int device_resume_early(struct device *dev, pm_message_t state, bool async) { pm_callback_t callback = NULL; - char *info = NULL; + const char *info = NULL; int error = 0; TRACE_DEVICE(dev); @@ -793,7 +795,7 @@ EXPORT_SYMBOL_GPL(dpm_resume_start); static int device_resume(struct device *dev, pm_message_t state, bool async) { pm_callback_t callback = NULL; - char *info = NULL; + const char *info = NULL; int error = 0; DECLARE_DPM_WATCHDOG_ON_STACK(wd); @@ -955,7 +957,7 @@ void dpm_resume(pm_message_t state) static void device_complete(struct device *dev, pm_message_t state) { void (*callback)(struct device *) = NULL; - char *info = NULL; + const char *info = NULL; if (dev->power.syscore) return; @@ -1080,7 +1082,7 @@ static pm_message_t resume_event(pm_message_t sleep_state) static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) { pm_callback_t callback = NULL; - char *info = NULL; + const char *info = NULL; int error = 0; TRACE_DEVICE(dev); @@ -1225,7 +1227,7 @@ int dpm_suspend_noirq(pm_message_t state) static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) { pm_callback_t callback = NULL; - char *info = NULL; + const char *info = NULL; int error = 0; TRACE_DEVICE(dev); @@ -1384,7 +1386,7 @@ EXPORT_SYMBOL_GPL(dpm_suspend_end); */ static int legacy_suspend(struct device *dev, pm_message_t state, int (*cb)(struct device *dev, pm_message_t state), - char *info) + const char *info) { int error; ktime_t calltime; @@ -1426,7 +1428,7 @@ static void dpm_clear_suppliers_direct_complete(struct device *dev) static int __device_suspend(struct device *dev, pm_message_t state, bool async) { pm_callback_t callback = NULL; - char *info = NULL; + const char *info = NULL; int error = 0; DECLARE_DPM_WATCHDOG_ON_STACK(wd); -- cgit v1.2.1