From 091930a2e612a02debe8694b41f96e33fe45bba2 Mon Sep 17 00:00:00 2001 From: Mark Langsdorf Date: Thu, 28 Feb 2013 18:29:19 +0000 Subject: [PATCH 1/8] mailbox, pl320-ipc: remove __init from probe function Avoids a section mismatch. Signed-off-by: Mark Langsdorf Signed-off-by: Rafael J. Wysocki --- drivers/mailbox/pl320-ipc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/mailbox/pl320-ipc.c b/drivers/mailbox/pl320-ipc.c index c45b3aedafba9..d873cbae2fbb8 100644 --- a/drivers/mailbox/pl320-ipc.c +++ b/drivers/mailbox/pl320-ipc.c @@ -138,8 +138,7 @@ int pl320_ipc_unregister_notifier(struct notifier_block *nb) } EXPORT_SYMBOL_GPL(pl320_ipc_unregister_notifier); -static int __init pl320_probe(struct amba_device *adev, - const struct amba_id *id) +static int pl320_probe(struct amba_device *adev, const struct amba_id *id) { int ret; From e5dde92cb2befb108ae8cfe8db68a954c164d77c Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Thu, 28 Feb 2013 05:38:00 +0000 Subject: [PATCH 2/8] cpufreq: Fix a typo in comment Fix a typo in a comment in cpufreq_governor.h. [rjw: Changelog] Signed-off-by: Namhyung Kim Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq_governor.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h index d2ac911506006..46bde01eee623 100644 --- a/drivers/cpufreq/cpufreq_governor.h +++ b/drivers/cpufreq/cpufreq_governor.h @@ -64,7 +64,7 @@ static void *get_cpu_dbs_info_s(int cpu) \ * dbs: used as a shortform for demand based switching It helps to keep variable * names smaller, simpler * cdbs: common dbs - * on_*: On-demand governor + * od_*: On-demand governor * cs_*: Conservative governor */ From 4b87581036849723242cadaa161e9b01234ef9ae Mon Sep 17 00:00:00 2001 From: Nishanth Menon Date: Tue, 26 Feb 2013 23:53:02 +0000 Subject: [PATCH 3/8] PM / OPP: improve introductory documentation Make Operating Performance Points (OPP) library introductory chapter a little more reader-friendly. Split the chapter into two sections, highlight the definition with an example and minor rewording to be verbose. Reported-by: Linus Torvalds Signed-off-by: Nishanth Menon Reviewed-by: Randy Dunlap Signed-off-by: Rafael J. Wysocki --- Documentation/power/opp.txt | 25 ++++++++++++++++++++----- 1 file changed, 20 insertions(+), 5 deletions(-) diff --git a/Documentation/power/opp.txt b/Documentation/power/opp.txt index 3035d00757ad5..425c51d56aefb 100644 --- a/Documentation/power/opp.txt +++ b/Documentation/power/opp.txt @@ -1,6 +1,5 @@ -*=============* -* OPP Library * -*=============* +Operating Performance Points (OPP) Library +========================================== (C) 2009-2010 Nishanth Menon , Texas Instruments Incorporated @@ -16,15 +15,31 @@ Contents 1. Introduction =============== +1.1 What is an Operating Performance Point (OPP)? + Complex SoCs of today consists of a multiple sub-modules working in conjunction. In an operational system executing varied use cases, not all modules in the SoC need to function at their highest performing frequency all the time. To facilitate this, sub-modules in a SoC are grouped into domains, allowing some -domains to run at lower voltage and frequency while other domains are loaded -more. The set of discrete tuples consisting of frequency and voltage pairs that +domains to run at lower voltage and frequency while other domains run at +voltage/frequency pairs that are higher. + +The set of discrete tuples consisting of frequency and voltage pairs that the device will support per domain are called Operating Performance Points or OPPs. +As an example: +Let us consider an MPU device which supports the following: +{300MHz at minimum voltage of 1V}, {800MHz at minimum voltage of 1.2V}, +{1GHz at minimum voltage of 1.3V} + +We can represent these as three OPPs as the following {Hz, uV} tuples: +{300000000, 1000000} +{800000000, 1200000} +{1000000000, 1300000} + +1.2 Operating Performance Points Library + OPP library provides a set of helper functions to organize and query the OPP information. The library is located in drivers/base/power/opp.c and the header is located in include/linux/opp.h. OPP library can be enabled by enabling From f5f43dcfff3a3c7f7de4a0cfca0106a0ccd58bd7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Emilio=20L=C3=B3pez?= Date: Mon, 25 Feb 2013 11:07:45 +0000 Subject: [PATCH 4/8] cpufreq: highbank: do not initialize array with a loop MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As uninitialized array members will be initialized to zero, we can avoid using a for loop by setting a value to it. Signed-off-by: Emilio López Acked-by: Viresh Kumar Acked-By: Mark Langsdorf Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/highbank-cpufreq.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/cpufreq/highbank-cpufreq.c b/drivers/cpufreq/highbank-cpufreq.c index 66e3a71b81a32..b61b5a3fad649 100644 --- a/drivers/cpufreq/highbank-cpufreq.c +++ b/drivers/cpufreq/highbank-cpufreq.c @@ -28,13 +28,7 @@ static int hb_voltage_change(unsigned int freq) { - int i; - u32 msg[HB_CPUFREQ_IPC_LEN]; - - msg[0] = HB_CPUFREQ_CHANGE_NOTE; - msg[1] = freq / 1000000; - for (i = 2; i < HB_CPUFREQ_IPC_LEN; i++) - msg[i] = 0; + u32 msg[HB_CPUFREQ_IPC_LEN] = {HB_CPUFREQ_CHANGE_NOTE, freq / 1000000}; return pl320_ipc_transmit(msg); } From b81ea1b5ac4d3c6a628158b736dd4a98c46c29d9 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 3 Mar 2013 22:48:14 +0100 Subject: [PATCH 5/8] PM / QoS: Fix concurrency issues and memory leaks in device PM QoS The current device PM QoS code assumes that certain functions will never be called in parallel with each other (for example, it is assumed that dev_pm_qos_expose_flags() won't be called in parallel with dev_pm_qos_hide_flags() for the same device and analogously for the latency limit), which may be overly optimistic. Moreover, dev_pm_qos_expose_flags() and dev_pm_qos_expose_latency_limit() leak memory in error code paths (req needs to be freed on errors) and __dev_pm_qos_drop_user_request() forgets to free the request. To fix the above issues put more things under the device PM QoS mutex to make them mutually exclusive and add the missing freeing of memory. Signed-off-by: Rafael J. Wysocki --- drivers/base/power/qos.c | 129 ++++++++++++++++++++++++++------------- 1 file changed, 87 insertions(+), 42 deletions(-) diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 3d4d1f8aac5c3..2159d62c858af 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -344,6 +344,13 @@ static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 curr_value; int ret = 0; + if (!req) /*guard against callers passing in null */ + return -EINVAL; + + if (WARN(!dev_pm_qos_request_active(req), + "%s() called for unknown object\n", __func__)) + return -EINVAL; + if (!req->dev->power.qos) return -ENODEV; @@ -386,6 +393,17 @@ int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value) { int ret; + mutex_lock(&dev_pm_qos_mtx); + ret = __dev_pm_qos_update_request(req, new_value); + mutex_unlock(&dev_pm_qos_mtx); + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_qos_update_request); + +static int __dev_pm_qos_remove_request(struct dev_pm_qos_request *req) +{ + int ret = 0; + if (!req) /*guard against callers passing in null */ return -EINVAL; @@ -393,13 +411,15 @@ int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value) "%s() called for unknown object\n", __func__)) return -EINVAL; - mutex_lock(&dev_pm_qos_mtx); - ret = __dev_pm_qos_update_request(req, new_value); - mutex_unlock(&dev_pm_qos_mtx); - + if (req->dev->power.qos) { + ret = apply_constraint(req, PM_QOS_REMOVE_REQ, + PM_QOS_DEFAULT_VALUE); + memset(req, 0, sizeof(*req)); + } else { + ret = -ENODEV; + } return ret; } -EXPORT_SYMBOL_GPL(dev_pm_qos_update_request); /** * dev_pm_qos_remove_request - modifies an existing qos request @@ -418,26 +438,10 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_update_request); */ int dev_pm_qos_remove_request(struct dev_pm_qos_request *req) { - int ret = 0; - - if (!req) /*guard against callers passing in null */ - return -EINVAL; - - if (WARN(!dev_pm_qos_request_active(req), - "%s() called for unknown object\n", __func__)) - return -EINVAL; + int ret; mutex_lock(&dev_pm_qos_mtx); - - if (req->dev->power.qos) { - ret = apply_constraint(req, PM_QOS_REMOVE_REQ, - PM_QOS_DEFAULT_VALUE); - memset(req, 0, sizeof(*req)); - } else { - /* Return if the device has been removed */ - ret = -ENODEV; - } - + ret = __dev_pm_qos_remove_request(req); mutex_unlock(&dev_pm_qos_mtx); return ret; } @@ -563,16 +567,20 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request); static void __dev_pm_qos_drop_user_request(struct device *dev, enum dev_pm_qos_req_type type) { + struct dev_pm_qos_request *req = NULL; + switch(type) { case DEV_PM_QOS_LATENCY: - dev_pm_qos_remove_request(dev->power.qos->latency_req); + req = dev->power.qos->latency_req; dev->power.qos->latency_req = NULL; break; case DEV_PM_QOS_FLAGS: - dev_pm_qos_remove_request(dev->power.qos->flags_req); + req = dev->power.qos->flags_req; dev->power.qos->flags_req = NULL; break; } + __dev_pm_qos_remove_request(req); + kfree(req); } /** @@ -588,22 +596,36 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) if (!device_is_registered(dev) || value < 0) return -EINVAL; - if (dev->power.qos && dev->power.qos->latency_req) - return -EEXIST; - req = kzalloc(sizeof(*req), GFP_KERNEL); if (!req) return -ENOMEM; ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY, value); - if (ret < 0) + if (ret < 0) { + kfree(req); return ret; + } + + mutex_lock(&dev_pm_qos_mtx); + + if (!dev->power.qos) + ret = -ENODEV; + else if (dev->power.qos->latency_req) + ret = -EEXIST; + + if (ret < 0) { + __dev_pm_qos_remove_request(req); + kfree(req); + goto out; + } dev->power.qos->latency_req = req; ret = pm_qos_sysfs_add_latency(dev); if (ret) __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY); + out: + mutex_unlock(&dev_pm_qos_mtx); return ret; } EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit); @@ -614,10 +636,14 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit); */ void dev_pm_qos_hide_latency_limit(struct device *dev) { + mutex_lock(&dev_pm_qos_mtx); + if (dev->power.qos && dev->power.qos->latency_req) { pm_qos_sysfs_remove_latency(dev); __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY); } + + mutex_unlock(&dev_pm_qos_mtx); } EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit); @@ -634,24 +660,37 @@ int dev_pm_qos_expose_flags(struct device *dev, s32 val) if (!device_is_registered(dev)) return -EINVAL; - if (dev->power.qos && dev->power.qos->flags_req) - return -EEXIST; - req = kzalloc(sizeof(*req), GFP_KERNEL); if (!req) return -ENOMEM; - pm_runtime_get_sync(dev); ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_FLAGS, val); - if (ret < 0) - goto fail; + if (ret < 0) { + kfree(req); + return ret; + } + + pm_runtime_get_sync(dev); + mutex_lock(&dev_pm_qos_mtx); + + if (!dev->power.qos) + ret = -ENODEV; + else if (dev->power.qos->flags_req) + ret = -EEXIST; + + if (ret < 0) { + __dev_pm_qos_remove_request(req); + kfree(req); + goto out; + } dev->power.qos->flags_req = req; ret = pm_qos_sysfs_add_flags(dev); if (ret) __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS); -fail: + out: + mutex_unlock(&dev_pm_qos_mtx); pm_runtime_put(dev); return ret; } @@ -663,12 +702,16 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_flags); */ void dev_pm_qos_hide_flags(struct device *dev) { + pm_runtime_get_sync(dev); + mutex_lock(&dev_pm_qos_mtx); + if (dev->power.qos && dev->power.qos->flags_req) { pm_qos_sysfs_remove_flags(dev); - pm_runtime_get_sync(dev); __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS); - pm_runtime_put(dev); } + + mutex_unlock(&dev_pm_qos_mtx); + pm_runtime_put(dev); } EXPORT_SYMBOL_GPL(dev_pm_qos_hide_flags); @@ -683,12 +726,14 @@ int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set) s32 value; int ret; - if (!dev->power.qos || !dev->power.qos->flags_req) - return -EINVAL; - pm_runtime_get_sync(dev); mutex_lock(&dev_pm_qos_mtx); + if (!dev->power.qos || !dev->power.qos->flags_req) { + ret = -EINVAL; + goto out; + } + value = dev_pm_qos_requested_flags(dev); if (set) value |= mask; @@ -697,9 +742,9 @@ int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set) ret = __dev_pm_qos_update_request(dev->power.qos->flags_req, value); + out: mutex_unlock(&dev_pm_qos_mtx); pm_runtime_put(dev); - return ret; } #endif /* CONFIG_PM_RUNTIME */ From 37530f2bda039774bd65aea14cc1d1dd26a82b9e Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 4 Mar 2013 14:22:57 +0100 Subject: [PATCH 6/8] PM / QoS: Remove device PM QoS sysfs attributes at the right place Device PM QoS sysfs attributes, if present during device removal, are removed from within device_pm_remove(), which is too late, since dpm_sysfs_remove() has already removed the whole attribute group they belonged to. However, moving the removal of those attributes to dpm_sysfs_remove() alone is not sufficient, because in theory they still can be re-added right after being removed by it (the device's driver is still bound to it at that point). For this reason, move the entire desctruction of device PM QoS constraints to dpm_sysfs_remove() and make it prevent any new constraints from being added after it has run. Also, move the initialization of the power.qos field in struct device to device_pm_init_common() and drop the no longer needed dev_pm_qos_constraints_init(). Reported-by: Sasha Levin Signed-off-by: Rafael J. Wysocki --- drivers/base/power/main.c | 2 - drivers/base/power/power.h | 8 +-- drivers/base/power/qos.c | 120 ++++++++++++++++--------------------- drivers/base/power/sysfs.c | 1 + 4 files changed, 55 insertions(+), 76 deletions(-) diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 2b7f77d3fcb0d..15beb500a4e4c 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -99,7 +99,6 @@ void device_pm_add(struct device *dev) dev_warn(dev, "parent %s should not be sleeping\n", dev_name(dev->parent)); list_add_tail(&dev->power.entry, &dpm_list); - dev_pm_qos_constraints_init(dev); mutex_unlock(&dpm_list_mtx); } @@ -113,7 +112,6 @@ void device_pm_remove(struct device *dev) dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); complete_all(&dev->power.completion); mutex_lock(&dpm_list_mtx); - dev_pm_qos_constraints_destroy(dev); list_del_init(&dev->power.entry); mutex_unlock(&dpm_list_mtx); device_wakeup_disable(dev); diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h index b16686a0a5a29..cfc3226ec4928 100644 --- a/drivers/base/power/power.h +++ b/drivers/base/power/power.h @@ -4,7 +4,7 @@ static inline void device_pm_init_common(struct device *dev) { if (!dev->power.early_init) { spin_lock_init(&dev->power.lock); - dev->power.power_state = PMSG_INVALID; + dev->power.qos = NULL; dev->power.early_init = true; } } @@ -56,14 +56,10 @@ extern void device_pm_move_last(struct device *); static inline void device_pm_sleep_init(struct device *dev) {} -static inline void device_pm_add(struct device *dev) -{ - dev_pm_qos_constraints_init(dev); -} +static inline void device_pm_add(struct device *dev) {} static inline void device_pm_remove(struct device *dev) { - dev_pm_qos_constraints_destroy(dev); pm_runtime_remove(dev); } diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 2159d62c858af..5f74587ef258f 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -41,6 +41,7 @@ #include #include #include +#include #include "power.h" @@ -61,7 +62,7 @@ enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask) struct pm_qos_flags *pqf; s32 val; - if (!qos) + if (IS_ERR_OR_NULL(qos)) return PM_QOS_FLAGS_UNDEFINED; pqf = &qos->flags; @@ -101,7 +102,8 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_flags); */ s32 __dev_pm_qos_read_value(struct device *dev) { - return dev->power.qos ? pm_qos_read_value(&dev->power.qos->latency) : 0; + return IS_ERR_OR_NULL(dev->power.qos) ? + 0 : pm_qos_read_value(&dev->power.qos->latency); } /** @@ -198,20 +200,8 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) return 0; } -/** - * dev_pm_qos_constraints_init - Initalize device's PM QoS constraints pointer. - * @dev: target device - * - * Called from the device PM subsystem during device insertion under - * device_pm_lock(). - */ -void dev_pm_qos_constraints_init(struct device *dev) -{ - mutex_lock(&dev_pm_qos_mtx); - dev->power.qos = NULL; - dev->power.power_state = PMSG_ON; - mutex_unlock(&dev_pm_qos_mtx); -} +static void __dev_pm_qos_hide_latency_limit(struct device *dev); +static void __dev_pm_qos_hide_flags(struct device *dev); /** * dev_pm_qos_constraints_destroy @@ -226,16 +216,15 @@ void dev_pm_qos_constraints_destroy(struct device *dev) struct pm_qos_constraints *c; struct pm_qos_flags *f; + mutex_lock(&dev_pm_qos_mtx); + /* * If the device's PM QoS resume latency limit or PM QoS flags have been * exposed to user space, they have to be hidden at this point. */ - dev_pm_qos_hide_latency_limit(dev); - dev_pm_qos_hide_flags(dev); - - mutex_lock(&dev_pm_qos_mtx); + __dev_pm_qos_hide_latency_limit(dev); + __dev_pm_qos_hide_flags(dev); - dev->power.power_state = PMSG_INVALID; qos = dev->power.qos; if (!qos) goto out; @@ -257,7 +246,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev) } spin_lock_irq(&dev->power.lock); - dev->power.qos = NULL; + dev->power.qos = ERR_PTR(-ENODEV); spin_unlock_irq(&dev->power.lock); kfree(c->notifiers); @@ -301,32 +290,19 @@ int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req, "%s() called for already added request\n", __func__)) return -EINVAL; - req->dev = dev; - mutex_lock(&dev_pm_qos_mtx); - if (!dev->power.qos) { - if (dev->power.power_state.event == PM_EVENT_INVALID) { - /* The device has been removed from the system. */ - req->dev = NULL; - ret = -ENODEV; - goto out; - } else { - /* - * Allocate the constraints data on the first call to - * add_request, i.e. only if the data is not already - * allocated and if the device has not been removed. - */ - ret = dev_pm_qos_constraints_allocate(dev); - } - } + if (IS_ERR(dev->power.qos)) + ret = -ENODEV; + else if (!dev->power.qos) + ret = dev_pm_qos_constraints_allocate(dev); if (!ret) { + req->dev = dev; req->type = type; ret = apply_constraint(req, PM_QOS_ADD_REQ, value); } - out: mutex_unlock(&dev_pm_qos_mtx); return ret; @@ -351,7 +327,7 @@ static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req, "%s() called for unknown object\n", __func__)) return -EINVAL; - if (!req->dev->power.qos) + if (IS_ERR_OR_NULL(req->dev->power.qos)) return -ENODEV; switch(req->type) { @@ -402,7 +378,7 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_update_request); static int __dev_pm_qos_remove_request(struct dev_pm_qos_request *req) { - int ret = 0; + int ret; if (!req) /*guard against callers passing in null */ return -EINVAL; @@ -411,13 +387,11 @@ static int __dev_pm_qos_remove_request(struct dev_pm_qos_request *req) "%s() called for unknown object\n", __func__)) return -EINVAL; - if (req->dev->power.qos) { - ret = apply_constraint(req, PM_QOS_REMOVE_REQ, - PM_QOS_DEFAULT_VALUE); - memset(req, 0, sizeof(*req)); - } else { - ret = -ENODEV; - } + if (IS_ERR_OR_NULL(req->dev->power.qos)) + return -ENODEV; + + ret = apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); + memset(req, 0, sizeof(*req)); return ret; } @@ -466,9 +440,10 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier) mutex_lock(&dev_pm_qos_mtx); - if (!dev->power.qos) - ret = dev->power.power_state.event != PM_EVENT_INVALID ? - dev_pm_qos_constraints_allocate(dev) : -ENODEV; + if (IS_ERR(dev->power.qos)) + ret = -ENODEV; + else if (!dev->power.qos) + ret = dev_pm_qos_constraints_allocate(dev); if (!ret) ret = blocking_notifier_chain_register( @@ -497,7 +472,7 @@ int dev_pm_qos_remove_notifier(struct device *dev, mutex_lock(&dev_pm_qos_mtx); /* Silently return if the constraints object is not present. */ - if (dev->power.qos) + if (!IS_ERR_OR_NULL(dev->power.qos)) retval = blocking_notifier_chain_unregister( dev->power.qos->latency.notifiers, notifier); @@ -608,7 +583,7 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) mutex_lock(&dev_pm_qos_mtx); - if (!dev->power.qos) + if (IS_ERR_OR_NULL(dev->power.qos)) ret = -ENODEV; else if (dev->power.qos->latency_req) ret = -EEXIST; @@ -630,6 +605,14 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) } EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit); +static void __dev_pm_qos_hide_latency_limit(struct device *dev) +{ + if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->latency_req) { + pm_qos_sysfs_remove_latency(dev); + __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY); + } +} + /** * dev_pm_qos_hide_latency_limit - Hide PM QoS latency limit from user space. * @dev: Device whose PM QoS latency limit is to be hidden from user space. @@ -637,12 +620,7 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit); void dev_pm_qos_hide_latency_limit(struct device *dev) { mutex_lock(&dev_pm_qos_mtx); - - if (dev->power.qos && dev->power.qos->latency_req) { - pm_qos_sysfs_remove_latency(dev); - __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY); - } - + __dev_pm_qos_hide_latency_limit(dev); mutex_unlock(&dev_pm_qos_mtx); } EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit); @@ -673,7 +651,7 @@ int dev_pm_qos_expose_flags(struct device *dev, s32 val) pm_runtime_get_sync(dev); mutex_lock(&dev_pm_qos_mtx); - if (!dev->power.qos) + if (IS_ERR_OR_NULL(dev->power.qos)) ret = -ENODEV; else if (dev->power.qos->flags_req) ret = -EEXIST; @@ -696,6 +674,14 @@ int dev_pm_qos_expose_flags(struct device *dev, s32 val) } EXPORT_SYMBOL_GPL(dev_pm_qos_expose_flags); +static void __dev_pm_qos_hide_flags(struct device *dev) +{ + if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->flags_req) { + pm_qos_sysfs_remove_flags(dev); + __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS); + } +} + /** * dev_pm_qos_hide_flags - Hide PM QoS flags of a device from user space. * @dev: Device whose PM QoS flags are to be hidden from user space. @@ -704,12 +690,7 @@ void dev_pm_qos_hide_flags(struct device *dev) { pm_runtime_get_sync(dev); mutex_lock(&dev_pm_qos_mtx); - - if (dev->power.qos && dev->power.qos->flags_req) { - pm_qos_sysfs_remove_flags(dev); - __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS); - } - + __dev_pm_qos_hide_flags(dev); mutex_unlock(&dev_pm_qos_mtx); pm_runtime_put(dev); } @@ -729,7 +710,7 @@ int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set) pm_runtime_get_sync(dev); mutex_lock(&dev_pm_qos_mtx); - if (!dev->power.qos || !dev->power.qos->flags_req) { + if (IS_ERR_OR_NULL(dev->power.qos) || !dev->power.qos->flags_req) { ret = -EINVAL; goto out; } @@ -747,4 +728,7 @@ int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set) pm_runtime_put(dev); return ret; } +#else /* !CONFIG_PM_RUNTIME */ +static void __dev_pm_qos_hide_latency_limit(struct device *dev) {} +static void __dev_pm_qos_hide_flags(struct device *dev) {} #endif /* CONFIG_PM_RUNTIME */ diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c index 50d16e3cb0a91..a53ebd2657016 100644 --- a/drivers/base/power/sysfs.c +++ b/drivers/base/power/sysfs.c @@ -708,6 +708,7 @@ void rpm_sysfs_remove(struct device *dev) void dpm_sysfs_remove(struct device *dev) { + dev_pm_qos_constraints_destroy(dev); rpm_sysfs_remove(dev); sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); sysfs_remove_group(&dev->kobj, &pm_attr_group); From 907cc908108b16ae87b7165be992511c968159f0 Mon Sep 17 00:00:00 2001 From: Dirk Brandewie Date: Tue, 5 Mar 2013 14:15:27 -0800 Subject: [PATCH 7/8] cpufreq / intel_pstate: Fix intel_pstate_init() error path If cpufreq_register_driver() fails just free memory that has been allocated and return. intel_pstate_exit() function is removed since we are built-in only now there is no reason for a module exit procedure. Reported-by: Konrad Rzeszutek Wilk Signed-off-by: Dirk Brandewie Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/intel_pstate.c | 39 ++++++++++------------------------ 1 file changed, 11 insertions(+), 28 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 096fde0ebcb5b..46a23b65dfc80 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -747,37 +747,11 @@ static struct cpufreq_driver intel_pstate_driver = { .owner = THIS_MODULE, }; -static void intel_pstate_exit(void) -{ - int cpu; - - sysfs_remove_group(intel_pstate_kobject, - &intel_pstate_attr_group); - debugfs_remove_recursive(debugfs_parent); - - cpufreq_unregister_driver(&intel_pstate_driver); - - if (!all_cpu_data) - return; - - get_online_cpus(); - for_each_online_cpu(cpu) { - if (all_cpu_data[cpu]) { - del_timer_sync(&all_cpu_data[cpu]->timer); - kfree(all_cpu_data[cpu]); - } - } - - put_online_cpus(); - vfree(all_cpu_data); -} -module_exit(intel_pstate_exit); - static int __initdata no_load; static int __init intel_pstate_init(void) { - int rc = 0; + int cpu, rc = 0; const struct x86_cpu_id *id; if (no_load) @@ -802,7 +776,16 @@ static int __init intel_pstate_init(void) intel_pstate_sysfs_expose_params(); return rc; out: - intel_pstate_exit(); + get_online_cpus(); + for_each_online_cpu(cpu) { + if (all_cpu_data[cpu]) { + del_timer_sync(&all_cpu_data[cpu]->timer); + kfree(all_cpu_data[cpu]); + } + } + + put_online_cpus(); + vfree(all_cpu_data); return -ENODEV; } device_initcall(intel_pstate_init); From d3929b832833db870af72479666fa4e4d043e02e Mon Sep 17 00:00:00 2001 From: Dirk Brandewie Date: Tue, 5 Mar 2013 14:15:26 -0800 Subject: [PATCH 8/8] cpufreq / intel_pstate: Do not load on VM that does not report max P state. It seems some VMs support the P state MSRs but return zeros. Fail gracefully if we are running in this environment. References: https://bugzilla.redhat.com/show_bug.cgi?id=916833 Reported-by: Josh Boyer Signed-off-by: Dirk Brandewie Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/intel_pstate.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 46a23b65dfc80..f6dd1e7611293 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -662,6 +662,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy) cpu = all_cpu_data[policy->cpu]; + if (!policy->cpuinfo.max_freq) + return -ENODEV; + intel_pstate_get_min_max(cpu, &min, &max); limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;