From c6f7b48e7e21989f4cfc996837d55c595d5dbf87 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Thu, 10 Sep 2015 16:00:50 +0200 Subject: PM / Domains: Remove name based API for genpd As all users of the named based APIs now have converted to the non-named based APIs, the time has come to remove them. Signed-off-by: Ulf Hansson Acked-by: Geert Uytterhoeven Acked-by: Kevin Hilman Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 90 --------------------------------------------- 1 file changed, 90 deletions(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 16550c63d611..a46427e72034 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -53,24 +53,6 @@ static LIST_HEAD(gpd_list); static DEFINE_MUTEX(gpd_list_lock); -static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) -{ - struct generic_pm_domain *genpd = NULL, *gpd; - - if (IS_ERR_OR_NULL(domain_name)) - return NULL; - - mutex_lock(&gpd_list_lock); - list_for_each_entry(gpd, &gpd_list, gpd_list_node) { - if (!strcmp(gpd->name, domain_name)) { - genpd = gpd; - break; - } - } - mutex_unlock(&gpd_list_lock); - return genpd; -} - /* * Get the generic PM domain for a particular struct device. * This validates the struct device pointer, the PM domain pointer, @@ -295,18 +277,6 @@ int pm_genpd_poweron(struct generic_pm_domain *genpd) return ret; } -/** - * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. - * @domain_name: Name of the PM domain to power up. - */ -int pm_genpd_name_poweron(const char *domain_name) -{ - struct generic_pm_domain *genpd; - - genpd = pm_genpd_lookup_name(domain_name); - return genpd ? pm_genpd_poweron(genpd) : -EINVAL; -} - static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, @@ -1316,18 +1286,6 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, return ret; } -/** - * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. - * @domain_name: Name of the PM domain to add the device to. - * @dev: Device to be added. - * @td: Set of PM QoS timing parameters to attach to the device. - */ -int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, - struct gpd_timing_data *td) -{ - return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); -} - /** * pm_genpd_remove_device - Remove a device from an I/O PM domain. * @genpd: PM domain to remove the device from. @@ -1428,35 +1386,6 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, return ret; } -/** - * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. - * @master_name: Name of the master PM domain to add the subdomain to. - * @subdomain_name: Name of the subdomain to be added. - */ -int pm_genpd_add_subdomain_names(const char *master_name, - const char *subdomain_name) -{ - struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; - - if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) - return -EINVAL; - - mutex_lock(&gpd_list_lock); - list_for_each_entry(gpd, &gpd_list, gpd_list_node) { - if (!master && !strcmp(gpd->name, master_name)) - master = gpd; - - if (!subdomain && !strcmp(gpd->name, subdomain_name)) - subdomain = gpd; - - if (master && subdomain) - break; - } - mutex_unlock(&gpd_list_lock); - - return pm_genpd_add_subdomain(master, subdomain); -} - /** * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. * @genpd: Master PM domain to remove the subdomain from. @@ -1565,16 +1494,6 @@ int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) goto out; } -/** - * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. - * @name: Name of the domain to connect to cpuidle. - * @state: cpuidle state this domain can manipulate. - */ -int pm_genpd_name_attach_cpuidle(const char *name, int state) -{ - return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); -} - /** * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. * @genpd: PM domain to remove the cpuidle connection from. @@ -1613,15 +1532,6 @@ int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) return ret; } -/** - * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. - * @name: Name of the domain to disconnect cpuidle from. - */ -int pm_genpd_name_detach_cpuidle(const char *name) -{ - return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); -} - /* Default device callbacks for generic PM domains. */ /** -- cgit v1.2.3 From cea3ad93d9a5e054d916f1ad71da02cb306e4828 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Tue, 1 Sep 2015 20:37:49 +0200 Subject: PM / Domains: Remove cpuidle attach The power domains code allows to tie a cpuidle state with a power domain. Preventing the cpuidle framework to enter a specific idle state by disabling from the power domain framework is a good idea. Unfortunately, the current implementation has some gaps with a SMP system and a complex cpuidle implementation. Enabling a power domain wakes up all the cpus even if a cpu does not belong to the power domain. There is some work to do a logical representation with the power domains of the hardware dependencies (eg. a cpu belongs to a power domains, these power domains belong to a higher power domain for a cluster, etc ...). A new code relying on the genpd hierarchy to disable the idle states would make more sense. As the unique user of this code has been removed, let's wipe out this code to prevent new user and to have a clean place to put a new implementation. Signed-off-by: Daniel Lezcano Acked-by: Kevin Hilman Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 135 -------------------------------------------- 1 file changed, 135 deletions(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a46427e72034..a544887d03c7 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -122,19 +122,6 @@ static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) smp_mb__after_atomic(); } -static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) -{ - s64 usecs64; - - if (!genpd->cpuidle_data) - return; - - usecs64 = genpd->power_on_latency_ns; - do_div(usecs64, NSEC_PER_USEC); - usecs64 += genpd->cpuidle_data->saved_exit_latency; - genpd->cpuidle_data->idle_state->exit_latency = usecs64; -} - static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) { ktime_t time_start; @@ -158,7 +145,6 @@ static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) genpd->power_on_latency_ns = elapsed_ns; genpd->max_off_time_changed = true; - genpd_recalc_cpu_exit_latency(genpd); pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", genpd->name, "on", elapsed_ns); @@ -222,13 +208,6 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd) || (genpd->prepared_count > 0 && genpd->suspend_power_off)) return 0; - if (genpd->cpuidle_data) { - cpuidle_pause_and_lock(); - genpd->cpuidle_data->idle_state->disabled = true; - cpuidle_resume_and_unlock(); - goto out; - } - /* * The list is guaranteed not to change while the loop below is being * executed, unless one of the masters' .power_on() callbacks fiddles @@ -381,21 +360,6 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd) return -EAGAIN; } - if (genpd->cpuidle_data) { - /* - * If cpuidle_data is set, cpuidle should turn the domain off - * when the CPU in it is idle. In that case we don't decrement - * the subdomain counts of the master domains, so that power is - * not removed from the current domain prematurely as a result - * of cutting off the masters' power. - */ - genpd->status = GPD_STATE_POWER_OFF; - cpuidle_pause_and_lock(); - genpd->cpuidle_data->idle_state->disabled = false; - cpuidle_resume_and_unlock(); - return 0; - } - if (genpd->power_off) { int ret; @@ -1433,105 +1397,6 @@ out: return ret; } -/** - * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. - * @genpd: PM domain to be connected with cpuidle. - * @state: cpuidle state this domain can disable/enable. - * - * Make a PM domain behave as though it contained a CPU core, that is, instead - * of calling its power down routine it will enable the given cpuidle state so - * that the cpuidle subsystem can power it down (if possible and desirable). - */ -int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) -{ - struct cpuidle_driver *cpuidle_drv; - struct gpd_cpuidle_data *cpuidle_data; - struct cpuidle_state *idle_state; - int ret = 0; - - if (IS_ERR_OR_NULL(genpd) || state < 0) - return -EINVAL; - - mutex_lock(&genpd->lock); - - if (genpd->cpuidle_data) { - ret = -EEXIST; - goto out; - } - cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); - if (!cpuidle_data) { - ret = -ENOMEM; - goto out; - } - cpuidle_drv = cpuidle_driver_ref(); - if (!cpuidle_drv) { - ret = -ENODEV; - goto err_drv; - } - if (cpuidle_drv->state_count <= state) { - ret = -EINVAL; - goto err; - } - idle_state = &cpuidle_drv->states[state]; - if (!idle_state->disabled) { - ret = -EAGAIN; - goto err; - } - cpuidle_data->idle_state = idle_state; - cpuidle_data->saved_exit_latency = idle_state->exit_latency; - genpd->cpuidle_data = cpuidle_data; - genpd_recalc_cpu_exit_latency(genpd); - - out: - mutex_unlock(&genpd->lock); - return ret; - - err: - cpuidle_driver_unref(); - - err_drv: - kfree(cpuidle_data); - goto out; -} - -/** - * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. - * @genpd: PM domain to remove the cpuidle connection from. - * - * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the - * given PM domain. - */ -int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) -{ - struct gpd_cpuidle_data *cpuidle_data; - struct cpuidle_state *idle_state; - int ret = 0; - - if (IS_ERR_OR_NULL(genpd)) - return -EINVAL; - - mutex_lock(&genpd->lock); - - cpuidle_data = genpd->cpuidle_data; - if (!cpuidle_data) { - ret = -ENODEV; - goto out; - } - idle_state = cpuidle_data->idle_state; - if (!idle_state->disabled) { - ret = -EAGAIN; - goto out; - } - idle_state->exit_latency = cpuidle_data->saved_exit_latency; - cpuidle_driver_unref(); - genpd->cpuidle_data = NULL; - kfree(cpuidle_data); - - out: - mutex_unlock(&genpd->lock); - return ret; -} - /* Default device callbacks for generic PM domains. */ /** -- cgit v1.2.3 From 1462206cbccebf2b61e05cf786d458afe49d5509 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 27 Sep 2015 15:20:30 +0200 Subject: PM / domains: Drop unused label Drop the "out" label in __pm_genpd_poweron() that's not used any more. Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a544887d03c7..cf4950d92937 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -227,7 +227,6 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd) if (ret) goto err; - out: genpd->status = GPD_STATE_ACTIVE; return 0; -- cgit v1.2.3 From f96b3c4f34b294a2293a5aa1d55e12e66aee055d Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Tue, 29 Sep 2015 15:12:37 +0200 Subject: PM / Domains: Remove in_progress counter from struct generic_pm_domain Commit ba2bbfbf6307 ("PM / Domains: Remove intermediate states..") changed the power off sequence (pm_genpd_poweroff()), which from locking point of view means the genpd mutex is held throughout the sequence. The above change means the in_progress counter can't be updated while pm_genpd_poweroff() is executing, which allows us to remove the counter. Instead we inform pm_genpd_poweroff() via a bool parameter, to indicate whether we call it from the scheduled work or from the ->runtime_suspend() callback, since that all that matters. Signed-off-by: Ulf Hansson Reviewed-by: Lina Iyer Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index cf4950d92937..c785f2e398b9 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -315,11 +315,12 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, /** * pm_genpd_poweroff - Remove power from a given PM domain. * @genpd: PM domain to power down. + * @is_async: PM domain is powered down from a scheduled work * * If all of the @genpd's devices have been suspended and all of its subdomains * have been powered down, remove power from @genpd. */ -static int pm_genpd_poweroff(struct generic_pm_domain *genpd) +static int pm_genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) { struct pm_domain_data *pdd; struct gpd_link *link; @@ -351,7 +352,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd) not_suspended++; } - if (not_suspended > genpd->in_progress) + if (not_suspended > 1 || (not_suspended == 1 && is_async)) return -EBUSY; if (genpd->gov && genpd->gov->power_down_ok) { @@ -399,7 +400,7 @@ static void genpd_power_off_work_fn(struct work_struct *work) genpd = container_of(work, struct generic_pm_domain, power_off_work); mutex_lock(&genpd->lock); - pm_genpd_poweroff(genpd); + pm_genpd_poweroff(genpd, true); mutex_unlock(&genpd->lock); } @@ -445,9 +446,7 @@ static int pm_genpd_runtime_suspend(struct device *dev) return 0; mutex_lock(&genpd->lock); - genpd->in_progress++; - pm_genpd_poweroff(genpd); - genpd->in_progress--; + pm_genpd_poweroff(genpd, false); mutex_unlock(&genpd->lock); return 0; @@ -1462,7 +1461,6 @@ void pm_genpd_init(struct generic_pm_domain *genpd, mutex_init(&genpd->lock); genpd->gov = gov; INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); - genpd->in_progress = 0; atomic_set(&genpd->sd_count, 0); genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; genpd->device_count = 0; -- cgit v1.2.3 From bb4b72fc63d4c1c2ccd5e5af95e48b77d6cad80c Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Tue, 6 Oct 2015 14:27:42 +0200 Subject: PM / Domains: Remove pm_genpd_poweroff_unused() API As the last user of the pm_genpd_poweroff_unused() API has moved into relying on genpd to deal with this internally from a late_initcall, let's remove the API. Signed-off-by: Ulf Hansson Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index c785f2e398b9..dcd451c85c99 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -501,15 +501,15 @@ static int __init pd_ignore_unused_setup(char *__unused) __setup("pd_ignore_unused", pd_ignore_unused_setup); /** - * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. + * genpd_poweroff_unused - Power off all PM domains with no devices in use. */ -void pm_genpd_poweroff_unused(void) +static int __init genpd_poweroff_unused(void) { struct generic_pm_domain *genpd; if (pd_ignore_unused) { pr_warn("genpd: Not disabling unused power domains\n"); - return; + return 0; } mutex_lock(&gpd_list_lock); @@ -518,11 +518,7 @@ void pm_genpd_poweroff_unused(void) genpd_queue_power_off_work(genpd); mutex_unlock(&gpd_list_lock); -} -static int __init genpd_poweroff_unused(void) -{ - pm_genpd_poweroff_unused(); return 0; } late_initcall(genpd_poweroff_unused); -- cgit v1.2.3 From ea823c7cbffa7bae311d78761866ac4db344c89b Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Tue, 6 Oct 2015 14:27:51 +0200 Subject: PM / Domains: Remove pm_genpd_poweron() API Once genpd could be configured to be built with CONFIG_PM_RUNTIME unset (nowadays CONFIG_PM), the pm_genpd_poweron() API served a purpose, since it allowed users to power on a PM domain. As such configuration no longer is supported, users shall solely rely on using some of the runtime PM APIs to power on a PM domain. Signed-off-by: Ulf Hansson Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index dcd451c85c99..8724b4732e64 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -192,6 +192,8 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) queue_work(pm_wq, &genpd->power_off_work); } +static int pm_genpd_poweron(struct generic_pm_domain *genpd); + /** * __pm_genpd_poweron - Restore power to a given PM domain and its masters. * @genpd: PM domain to power up. @@ -245,7 +247,7 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd) * pm_genpd_poweron - Restore power to a given PM domain and its masters. * @genpd: PM domain to power up. */ -int pm_genpd_poweron(struct generic_pm_domain *genpd) +static int pm_genpd_poweron(struct generic_pm_domain *genpd) { int ret; -- cgit v1.2.3 From 7420aa4fed8cc7f3f7d7cc89ea1028fddfdacac8 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Tue, 13 Oct 2015 09:58:02 +0200 Subject: PM / Domains: Rename *pm_genpd_poweron|poweroff() This is another step to get consistent names of functions in genpd. Let's rename the internal *pm_genpd_poweron|poweroff() into *genpd_poweron|poweroff(). Signed-off-by: Ulf Hansson Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 38 +++++++++++++++++++------------------- 1 file changed, 19 insertions(+), 19 deletions(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 8724b4732e64..6e1bcdef7a79 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -181,10 +181,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) } /** - * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). + * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff(). * @genpd: PM domait to power off. * - * Queue up the execution of pm_genpd_poweroff() unless it's already been done + * Queue up the execution of genpd_poweroff() unless it's already been done * before. */ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) @@ -192,16 +192,16 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) queue_work(pm_wq, &genpd->power_off_work); } -static int pm_genpd_poweron(struct generic_pm_domain *genpd); +static int genpd_poweron(struct generic_pm_domain *genpd); /** - * __pm_genpd_poweron - Restore power to a given PM domain and its masters. + * __genpd_poweron - Restore power to a given PM domain and its masters. * @genpd: PM domain to power up. * * Restore power to @genpd and all of its masters so that it is possible to * resume a device belonging to it. */ -static int __pm_genpd_poweron(struct generic_pm_domain *genpd) +static int __genpd_poweron(struct generic_pm_domain *genpd) { struct gpd_link *link; int ret = 0; @@ -218,7 +218,7 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd) list_for_each_entry(link, &genpd->slave_links, slave_node) { genpd_sd_counter_inc(link->master); - ret = pm_genpd_poweron(link->master); + ret = genpd_poweron(link->master); if (ret) { genpd_sd_counter_dec(link->master); goto err; @@ -244,15 +244,15 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd) } /** - * pm_genpd_poweron - Restore power to a given PM domain and its masters. + * genpd_poweron - Restore power to a given PM domain and its masters. * @genpd: PM domain to power up. */ -static int pm_genpd_poweron(struct generic_pm_domain *genpd) +static int genpd_poweron(struct generic_pm_domain *genpd) { int ret; mutex_lock(&genpd->lock); - ret = __pm_genpd_poweron(genpd); + ret = __genpd_poweron(genpd); mutex_unlock(&genpd->lock); return ret; } @@ -315,14 +315,14 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, } /** - * pm_genpd_poweroff - Remove power from a given PM domain. + * genpd_poweroff - Remove power from a given PM domain. * @genpd: PM domain to power down. * @is_async: PM domain is powered down from a scheduled work * * If all of the @genpd's devices have been suspended and all of its subdomains * have been powered down, remove power from @genpd. */ -static int pm_genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) +static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) { struct pm_domain_data *pdd; struct gpd_link *link; @@ -370,10 +370,10 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) /* * If sd_count > 0 at this point, one of the subdomains hasn't - * managed to call pm_genpd_poweron() for the master yet after - * incrementing it. In that case pm_genpd_poweron() will wait + * managed to call genpd_poweron() for the master yet after + * incrementing it. In that case genpd_poweron() will wait * for us to drop the lock, so we can call .power_off() and let - * the pm_genpd_poweron() restore power for us (this shouldn't + * the genpd_poweron() restore power for us (this shouldn't * happen very often). */ ret = genpd_power_off(genpd, true); @@ -402,7 +402,7 @@ static void genpd_power_off_work_fn(struct work_struct *work) genpd = container_of(work, struct generic_pm_domain, power_off_work); mutex_lock(&genpd->lock); - pm_genpd_poweroff(genpd, true); + genpd_poweroff(genpd, true); mutex_unlock(&genpd->lock); } @@ -448,7 +448,7 @@ static int pm_genpd_runtime_suspend(struct device *dev) return 0; mutex_lock(&genpd->lock); - pm_genpd_poweroff(genpd, false); + genpd_poweroff(genpd, false); mutex_unlock(&genpd->lock); return 0; @@ -481,7 +481,7 @@ static int pm_genpd_runtime_resume(struct device *dev) } mutex_lock(&genpd->lock); - ret = __pm_genpd_poweron(genpd); + ret = __genpd_poweron(genpd); mutex_unlock(&genpd->lock); if (ret) @@ -694,7 +694,7 @@ static int pm_genpd_prepare(struct device *dev) /* * The PM domain must be in the GPD_STATE_ACTIVE state at this point, - * so pm_genpd_poweron() will return immediately, but if the device + * so genpd_poweron() will return immediately, but if the device * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need * to make it operational. */ @@ -1793,7 +1793,7 @@ int genpd_dev_pm_attach(struct device *dev) dev->pm_domain->detach = genpd_dev_pm_detach; dev->pm_domain->sync = genpd_dev_pm_sync; - ret = pm_genpd_poweron(pd); + ret = genpd_poweron(pd); out: return ret ? -EPROBE_DEFER : 0; -- cgit v1.2.3 From 51cda844892fded75d3ad07d0233e73572eba2f3 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Thu, 15 Oct 2015 17:02:06 +0200 Subject: PM / Domains: Don't measure ->start|stop() latency in system PM callbacks Measure latency does by itself contribute to an increased latency, thus we should avoid it when it isn't needed. Genpd measures latencies in the system PM phase for the ->start|stop() callbacks and is thus affecting the system PM suspend/resume time. Moreover these latencies are validated only at runtime PM suspend/resume. To this reasoning, let's decide to leave these measurements out of the system PM phase. There should be plenty of occasions during runtime PM to perform these measurements anyway. Signed-off-by: Ulf Hansson Reviewed-by: Lina Iyer Acked-by: Kevin Hilman Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 6e1bcdef7a79..a1c3ec4cc4fb 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -90,8 +90,12 @@ static struct generic_pm_domain *dev_to_genpd(struct device *dev) return pd_to_genpd(dev->pm_domain); } -static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) +static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev, + bool timed) { + if (!timed) + return GENPD_DEV_CALLBACK(genpd, int, stop, dev); + return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, stop_latency_ns, "stop"); } @@ -434,7 +438,7 @@ static int pm_genpd_runtime_suspend(struct device *dev) if (ret) return ret; - ret = genpd_stop_dev(genpd, dev); + ret = genpd_stop_dev(genpd, dev, true); if (ret) { genpd_restore_dev(genpd, dev, true); return ret; @@ -779,7 +783,7 @@ static int pm_genpd_suspend_noirq(struct device *dev) || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) return 0; - genpd_stop_dev(genpd, dev); + genpd_stop_dev(genpd, dev, false); /* * Since all of the "noirq" callbacks are executed sequentially, it is @@ -820,7 +824,7 @@ static int pm_genpd_resume_noirq(struct device *dev) pm_genpd_sync_poweron(genpd, true); genpd->suspended_count--; - return genpd_start_dev(genpd, dev, true); + return genpd_start_dev(genpd, dev, false); } /** @@ -928,7 +932,7 @@ static int pm_genpd_freeze_noirq(struct device *dev) if (IS_ERR(genpd)) return -EINVAL; - return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); + return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev, false); } /** @@ -948,7 +952,8 @@ static int pm_genpd_thaw_noirq(struct device *dev) if (IS_ERR(genpd)) return -EINVAL; - return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev, true); + return genpd->suspend_power_off ? + 0 : genpd_start_dev(genpd, dev, false); } /** @@ -1042,7 +1047,7 @@ static int pm_genpd_restore_noirq(struct device *dev) pm_genpd_sync_poweron(genpd, true); - return genpd_start_dev(genpd, dev, true); + return genpd_start_dev(genpd, dev, false); } /** -- cgit v1.2.3 From 2b1d88cda32f81685bae45c00bf517f77bcda3cd Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Thu, 15 Oct 2015 17:02:19 +0200 Subject: PM / Domains: Merge measurements for PM QoS device latencies Measure latency does by itself contribute to an increased latency, thus we should avoid it when it isn't needed. By merging the latency measurements for the ->save_state() and the ->stop() callbacks, we get one measurement instead of two and we get one value to store instead of two. Let's also apply the likewise change for the ->start() and ->restore_state() callbacks. Signed-off-by: Ulf Hansson Reviewed-by: Lina Iyer Acked-by: Kevin Hilman Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 99 +++++++++++++++++++----------------- drivers/base/power/domain_governor.c | 6 +-- 2 files changed, 53 insertions(+), 52 deletions(-) (limited to 'drivers/base/power') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a1c3ec4cc4fb..a7dfdf9f15ba 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -34,22 +34,6 @@ __ret; \ }) -#define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ -({ \ - ktime_t __start = ktime_get(); \ - type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ - s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ - struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ - if (!__retval && __elapsed > __td->field) { \ - __td->field = __elapsed; \ - dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ - __elapsed); \ - genpd->max_off_time_changed = true; \ - __td->constraint_changed = true; \ - } \ - __retval; \ -}) - static LIST_HEAD(gpd_list); static DEFINE_MUTEX(gpd_list_lock); @@ -90,24 +74,14 @@ static struct generic_pm_domain *dev_to_genpd(struct device *dev) return pd_to_genpd(dev->pm_domain); } -static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev, - bool timed) +static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) { - if (!timed) - return GENPD_DEV_CALLBACK(genpd, int, stop, dev); - - return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, - stop_latency_ns, "stop"); + return GENPD_DEV_CALLBACK(genpd, int, stop, dev); } -static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev, - bool timed) +static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) { - if (!timed) - return GENPD_DEV_CALLBACK(genpd, int, start, dev); - - return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, - start_latency_ns, "start"); + return GENPD_DEV_CALLBACK(genpd, int, start, dev); } static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) @@ -263,19 +237,13 @@ static int genpd_poweron(struct generic_pm_domain *genpd) static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) { - return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, - save_state_latency_ns, "state save"); + return GENPD_DEV_CALLBACK(genpd, int, save_state, dev); } static int genpd_restore_dev(struct generic_pm_domain *genpd, - struct device *dev, bool timed) + struct device *dev) { - if (!timed) - return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); - - return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, - restore_state_latency_ns, - "state restore"); + return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); } static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, @@ -422,6 +390,9 @@ static int pm_genpd_runtime_suspend(struct device *dev) { struct generic_pm_domain *genpd; bool (*stop_ok)(struct device *__dev); + struct gpd_timing_data *td = &dev_gpd_data(dev)->td; + ktime_t time_start; + s64 elapsed_ns; int ret; dev_dbg(dev, "%s()\n", __func__); @@ -434,16 +405,29 @@ static int pm_genpd_runtime_suspend(struct device *dev) if (stop_ok && !stop_ok(dev)) return -EBUSY; + /* Measure suspend latency. */ + time_start = ktime_get(); + ret = genpd_save_dev(genpd, dev); if (ret) return ret; - ret = genpd_stop_dev(genpd, dev, true); + ret = genpd_stop_dev(genpd, dev); if (ret) { - genpd_restore_dev(genpd, dev, true); + genpd_restore_dev(genpd, dev); return ret; } + /* Update suspend latency value if the measured time exceeds it. */ + elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); + if (elapsed_ns > td->suspend_latency_ns) { + td->suspend_latency_ns = elapsed_ns; + dev_dbg(dev, "suspend latency exceeded, %lld ns\n", + elapsed_ns); + genpd->max_off_time_changed = true; + td->constraint_changed = true; + } + /* * If power.irq_safe is set, this routine will be run with interrupts * off, so it can't use mutexes. @@ -469,6 +453,9 @@ static int pm_genpd_runtime_suspend(struct device *dev) static int pm_genpd_runtime_resume(struct device *dev) { struct generic_pm_domain *genpd; + struct gpd_timing_data *td = &dev_gpd_data(dev)->td; + ktime_t time_start; + s64 elapsed_ns; int ret; bool timed = true; @@ -492,8 +479,24 @@ static int pm_genpd_runtime_resume(struct device *dev) return ret; out: - genpd_start_dev(genpd, dev, timed); - genpd_restore_dev(genpd, dev, timed); + /* Measure resume latency. */ + if (timed) + time_start = ktime_get(); + + genpd_start_dev(genpd, dev); + genpd_restore_dev(genpd, dev); + + /* Update resume latency value if the measured time exceeds it. */ + if (timed) { + elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); + if (elapsed_ns > td->resume_latency_ns) { + td->resume_latency_ns = elapsed_ns; + dev_dbg(dev, "resume latency exceeded, %lld ns\n", + elapsed_ns); + genpd->max_off_time_changed = true; + td->constraint_changed = true; + } + } return 0; } @@ -783,7 +786,7 @@ static int pm_genpd_suspend_noirq(struct device *dev) || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) return 0; - genpd_stop_dev(genpd, dev, false); + genpd_stop_dev(genpd, dev); /* * Since all of the "noirq" callbacks are executed sequentially, it is @@ -824,7 +827,7 @@ static int pm_genpd_resume_noirq(struct device *dev) pm_genpd_sync_poweron(genpd, true); genpd->suspended_count--; - return genpd_start_dev(genpd, dev, false); + return genpd_start_dev(genpd, dev); } /** @@ -932,7 +935,7 @@ static int pm_genpd_freeze_noirq(struct device *dev) if (IS_ERR(genpd)) return -EINVAL; - return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev, false); + return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); } /** @@ -953,7 +956,7 @@ static int pm_genpd_thaw_noirq(struct device *dev) return -EINVAL; return genpd->suspend_power_off ? - 0 : genpd_start_dev(genpd, dev, false); + 0 : genpd_start_dev(genpd, dev); } /** @@ -1047,7 +1050,7 @@ static int pm_genpd_restore_noirq(struct device *dev) pm_genpd_sync_poweron(genpd, true); - return genpd_start_dev(genpd, dev, false); + return genpd_start_dev(genpd, dev); } /** diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c index 85e17bacc834..e60dd12e23aa 100644 --- a/drivers/base/power/domain_governor.c +++ b/drivers/base/power/domain_governor.c @@ -77,10 +77,8 @@ static bool default_stop_ok(struct device *dev) dev_update_qos_constraint); if (constraint_ns > 0) { - constraint_ns -= td->save_state_latency_ns + - td->stop_latency_ns + - td->start_latency_ns + - td->restore_state_latency_ns; + constraint_ns -= td->suspend_latency_ns + + td->resume_latency_ns; if (constraint_ns == 0) return false; } -- cgit v1.2.3