From d031e1de2c5ba91e67ed83f6adf624543ab2b03d Mon Sep 17 00:00:00 2001 From: Alex Frid Date: Sun, 29 Jan 2012 20:39:25 +0100 Subject: PM / QoS: Simplify PM QoS expansion/merge - Replace class ID #define with enumeration - Loop through PM QoS objects during initialization (rather than initializing them one-by-one) Signed-off-by: Alex Frid Reviewed-by: Antti Miettinen Reviewed-by: Diwakar Tundlam Reviewed-by: Scott Williams Reviewed-by: Yu-Huan Hsu Acked-by: markgross Signed-off-by: Rafael J. Wysocki --- include/linux/pm_qos.h | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'include/linux/pm_qos.h') diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index e5bbcbaa6f57..5ac91d8e69de 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -9,12 +9,16 @@ #include #include -#define PM_QOS_RESERVED 0 -#define PM_QOS_CPU_DMA_LATENCY 1 -#define PM_QOS_NETWORK_LATENCY 2 -#define PM_QOS_NETWORK_THROUGHPUT 3 +enum { + PM_QOS_RESERVED = 0, + PM_QOS_CPU_DMA_LATENCY, + PM_QOS_NETWORK_LATENCY, + PM_QOS_NETWORK_THROUGHPUT, + + /* insert new class ID */ + PM_QOS_NUM_CLASSES, +}; -#define PM_QOS_NUM_CLASSES 4 #define PM_QOS_DEFAULT_VALUE -1 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC) -- cgit v1.2.3 From a9b542ee607a8afafa9447292394959fc84ea650 Mon Sep 17 00:00:00 2001 From: Jean Pihet Date: Mon, 13 Feb 2012 16:23:42 +0100 Subject: PM / QoS: unconditionally build the feature The PM QoS feature originally didn't depend on CONFIG_PM, which was mistakenly changed by commit e8db0be1245de16a6cc6365506abc392c3c212d4 PM QoS: Move and rename the implementation files Later, commit d020283dc694c9ec31b410f522252f7a8397e67d PM / QoS: CPU C-state breakage with PM Qos change partially fixed that by introducing a static inline definition of pm_qos_request(), but that still didn't allow user space to use the PM QoS interface if CONFIG_PM was unset (which had been possible before). For this reason, remove the dependency of PM QoS on CONFIG_PM to make it work (as intended) with CONFIG_PM unset. [rjw: Replaced the original changelog with a new one.] Signed-off-by: Jean Pihet Reported-by: Venkatesh Pallipadi Signed-off-by: Rafael J. Wysocki --- include/linux/pm_qos.h | 41 +---------------------------------------- 1 file changed, 1 insertion(+), 40 deletions(-) (limited to 'include/linux/pm_qos.h') diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 67c521731f41..c8a541e13380 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -67,7 +67,6 @@ static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req) return req->dev != 0; } -#ifdef CONFIG_PM int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node, enum pm_qos_req_action action, int value); void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class, @@ -82,6 +81,7 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier); int pm_qos_request_active(struct pm_qos_request *req); s32 pm_qos_read_value(struct pm_qos_constraints *c); +#ifdef CONFIG_PM s32 __dev_pm_qos_read_value(struct device *dev); s32 dev_pm_qos_read_value(struct device *dev); int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req, @@ -99,45 +99,6 @@ void dev_pm_qos_constraints_destroy(struct device *dev); int dev_pm_qos_add_ancestor_request(struct device *dev, struct dev_pm_qos_request *req, s32 value); #else -static inline int pm_qos_update_target(struct pm_qos_constraints *c, - struct plist_node *node, - enum pm_qos_req_action action, - int value) - { return 0; } -static inline void pm_qos_add_request(struct pm_qos_request *req, - int pm_qos_class, s32 value) - { return; } -static inline void pm_qos_update_request(struct pm_qos_request *req, - s32 new_value) - { return; } -static inline void pm_qos_remove_request(struct pm_qos_request *req) - { return; } - -static inline int pm_qos_request(int pm_qos_class) -{ - switch (pm_qos_class) { - case PM_QOS_CPU_DMA_LATENCY: - return PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE; - case PM_QOS_NETWORK_LATENCY: - return PM_QOS_NETWORK_LAT_DEFAULT_VALUE; - case PM_QOS_NETWORK_THROUGHPUT: - return PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE; - default: - return PM_QOS_DEFAULT_VALUE; - } -} - -static inline int pm_qos_add_notifier(int pm_qos_class, - struct notifier_block *notifier) - { return 0; } -static inline int pm_qos_remove_notifier(int pm_qos_class, - struct notifier_block *notifier) - { return 0; } -static inline int pm_qos_request_active(struct pm_qos_request *req) - { return 0; } -static inline s32 pm_qos_read_value(struct pm_qos_constraints *c) - { return 0; } - static inline s32 __dev_pm_qos_read_value(struct device *dev) { return 0; } static inline s32 dev_pm_qos_read_value(struct device *dev) -- cgit v1.2.3 From 85dc0b8a4019e38ad4fd0c008f89a5c241805ac2 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Tue, 13 Mar 2012 01:01:39 +0100 Subject: PM / QoS: Make it possible to expose PM QoS latency constraints A runtime suspend of a device (e.g. an MMC controller) belonging to a power domain or, in a more complicated scenario, a runtime suspend of another device in the same power domain, may cause power to be removed from the entire domain. In that case, the amount of time necessary to runtime-resume the given device (e.g. the MMC controller) is often substantially greater than the time needed to run its driver's runtime resume callback. That may hurt performance in some situations, because user data may need to wait for the device to become operational, so we should make it possible to prevent that from happening. For this reason, introduce a new sysfs attribute for devices, power/pm_qos_resume_latency_us, allowing user space to specify the upper bound of the time necessary to bring the (runtime-suspended) device up after the resume of it has been requested. However, make that attribute appear only for the devices whose drivers declare support for it by calling the (new) dev_pm_qos_expose_latency_limit() helper function with the appropriate initial value of the attribute. Signed-off-by: Rafael J. Wysocki Reviewed-by: Kevin Hilman Reviewed-by: Mark Brown Acked-by: Linus Walleij --- include/linux/pm_qos.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/linux/pm_qos.h') diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index c8a541e13380..2e9191a712f3 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -137,4 +137,13 @@ static inline int dev_pm_qos_add_ancestor_request(struct device *dev, { return 0; } #endif +#ifdef CONFIG_PM_RUNTIME +int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value); +void dev_pm_qos_hide_latency_limit(struct device *dev); +#else +static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) + { return 0; } +static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {} +#endif + #endif -- cgit v1.2.3 From c4772d192c70b61d52262b0db76f7abd8aeb51c6 Mon Sep 17 00:00:00 2001 From: MyungJoo Ham Date: Wed, 28 Mar 2012 23:31:24 +0200 Subject: PM / QoS: add pm_qos_update_request_timeout() API The new API, pm_qos_update_request_timeout() is to provide a timeout with pm_qos_update_request. For example, pm_qos_update_request_timeout(req, 100, 1000), means that QoS request on req with value 100 will be active for 1000 microseconds. After 1000 microseconds, the QoS request thru req is reset. If there were another pm_qos_update_request(req, x) during the 1000 us, this new request with value x will override as this is another request on the same req handle. A new request on the same req handle will always override the previous request whether it is the conventional request or it is the new timeout request. Signed-off-by: MyungJoo Ham Signed-off-by: Kyungmin Park Acked-by: Mark Gross Signed-off-by: Rafael J. Wysocki --- include/linux/pm_qos.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/pm_qos.h') diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 2e9191a712f3..233149cb19f4 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -8,6 +8,7 @@ #include #include #include +#include enum { PM_QOS_RESERVED = 0, @@ -29,6 +30,7 @@ enum { struct pm_qos_request { struct plist_node node; int pm_qos_class; + struct delayed_work work; /* for pm_qos_update_request_timeout */ }; struct dev_pm_qos_request { @@ -73,6 +75,8 @@ void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class, s32 value); void pm_qos_update_request(struct pm_qos_request *req, s32 new_value); +void pm_qos_update_request_timeout(struct pm_qos_request *req, + s32 new_value, unsigned long timeout_us); void pm_qos_remove_request(struct pm_qos_request *req); int pm_qos_request(int pm_qos_class); -- cgit v1.2.3