Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756961Ab3HZPvi (ORCPT ); Mon, 26 Aug 2013 11:51:38 -0400 Received: from mailout1.samsung.com ([203.254.224.24]:24011 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751996Ab3HZPve (ORCPT ); Mon, 26 Aug 2013 11:51:34 -0400 X-AuditID: cbfee61b-b7f776d0000016c8-65-521b7984cd22 From: Lukasz Majewski To: Viresh Kumar , "Rafael J. Wysocki" , Zhang Rui , Eduardo Valentin Cc: "cpufreq@vger.kernel.org" , Linux PM list , Jonghwa Lee , Lukasz Majewski , Lukasz Majewski , linux-kernel , Bartlomiej Zolnierkiewicz , Daniel Lezcano , Kukjin Kim , Myungjoo Ham , durgadoss.r@intel.com Subject: [PATCH v8 1/7] cpufreq: Add boost frequency support in core Date: Mon, 26 Aug 2013 17:50:37 +0200 Message-id: <1377532243-17076-2-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10 In-reply-to: <1377532243-17076-1-git-send-email-l.majewski@samsung.com> References: <1370502472-7249-1-git-send-email-l.majewski@samsung.com> <1377532243-17076-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrCLMWRmVeSWpSXmKPExsVy+t9jQd2WSukgg/5TxhYbZ6xntXja9IPd Yt5nWYu+n1eYLdbs/8lk0Xn2CbNF74KrbBZvHnFbvHm4mdHi8q45bBafe48wWtxuXMFm0b+w l8niycM+NouNXz0c+D0W73nJ5HHn2h42j3XT3jJ79G1ZxejxaHELo8fxG9uZPD5vkgtgj+Ky SUnNySxLLdK3S+DK+PFxGnPB9OKKX0tvsDcwzo7vYuTkkBAwkVi38RAbhC0mceHeeiCbi0NI YDqjxPJpM5khnC4miWXL3jCDVLEJ6El8vvuUCcQWEZjDKHHnqDtIEbPAA2aJxd+/MIIkhAVc JO6d/wZmswioSlzevwismVfATeL8xgXMEOvkJZ7e7wNbzSngLnGq7y1YXEigiVGif73MBEbe BYwMqxhFUwuSC4qT0nON9IoTc4tL89L1kvNzNzGCw/aZ9A7GVQ0WhxgFOBiVeHgD2KSDhFgT y4orcw8xSnAwK4nwcqQChXhTEiurUovy44tKc1KLDzFKc7AoifMebLUOFBJITyxJzU5NLUgt gskycXBKNTB2Tip+9OOu8IGW02+ajV9tmzd/5/q8Jw1PNm4Na5G2/t3pIVadO0PTMz/qr+S+ PZo5f34Yaz0ov9P6Y23P8zNbN/zbV+yxqzvg3fuElPMJJwJORN2o/bH64FO2gtkGO0SuLNQ9 sGoZ+xX3N7+kJu8R1lJzW32vy26rzrVvW6+/KrBgstrgxXE1U4mlOCPRUIu5qDgRAM6aV/xX AgAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 14579 Lines: 414 This commit adds boost frequency support in cpufreq core (Hardware & Software). Some SoCs (like Exynos4 - e.g. 4x12) allow setting frequency above its normal operation limits. Such mode shall be only used for a short time. Overclocking (boost) support is essentially provided by platform dependent cpufreq driver. This commit unifies support for SW and HW (Intel) overclocking solutions in the core cpufreq driver. Previously the "boost" sysfs attribute was defined at acpi driver code. By default boost is disabled. One global attribute is available at: /sys/devices/system/cpu/cpufreq/boost. It only shows up when cpufreq driver supports overclocking. Under the hood frequencies dedicated for boosting are marked with a special flag (CPUFREQ_BOOST_FREQ) at driver's frequency table. It is the user's concern to enable/disable overclocking with a proper call to sysfs. The cpufreq_boost_trigger_state() function is defined non static on purpose. It is used later with thermal subsystem to provide automatic enable/disable of the BOOST feature. Signed-off-by: Lukasz Majewski Signed-off-by: Myungjoo Ham --- Changes for v8: - Correction of error message at cpufreq_boost_trigger_state() function - Rewrite the cpufreq_boost_set_sw() function to print error message and break the loop when policy adjustment fails Changes for v7: - Properly change cpufreq_driver->boost_enabled when set_boost() fails (=0 to =!state) - Add likely() around cpufreq_driver - Remove parenthesis around boost.attr Changes for v6: - Remove sysfs boost attribute when subsys_iterface_unregister() fails - Move global boost_enabled variable from cpufreq.c to platform dependent struct cpufreq_driver - pr_err() message is also printed when boost disable fails - Call __cpufreq_governor() to force recalculation of next frequency when boost is triggered. It is needed with i.e. performance class of governors - Change cpufreq_boost_enable_sw() -> cpufreq_boost_set_sw() - Rename .enable_boost function pointer to .set_boost Changes for v5: - Rename cpufreq_boost_trigger_state_sw() to cpufreq_boost_enable_sw() - Extent cpufreq_register_driver() to check if cpufreq driver provided boost_enable callback. If not provided, then use cpufreq_boost_enable_sw() - Use single call to cpufreq_driver->enable_boost() with cpufreq driver provided callback or default SW boost enable routine - Move pr_debug call to store_boost() from cpufreq_boost_trigger_state() - Change the user_policy.max value when SW boost is toggled. It is necessary for proper operation of e.g. thermal subsystem. - Add check if cpufreq_driver pointer is not NULL at cpufreq_boost_supported() routine - Add EXPORT_SYMBOL_GPL for cpufreq_boost_supported() and cpufreq_boost_enabled() - Remove extra check for cpufreq_boost_supported() at cpufreq_freq_table_cpuinfo() - Explanation of show boost logic at show_available_freqs() - Add cpufreq_set_boost_enabled() method to set initial value of boost_enabled global flag Changes for v4: - Remove boost parameter from cpufreq_frequency_table_cpuinfo() function - Introduce cpufreq_boost_supported() method - Use of cpufreq_boost_supported() and cpufreq_boost_enabled() to decide if frequency shall be skipped - Rename set_boost_freq() to enable_boost() - cpufreq_attr_available_freq() moved to freq_table.c - Use policy list to get access to cpufreq policies - Rename global boost flag (cpufreq_boost_enabled -> boost_enabled) - pr_err corrected ( %sable) - Remove sanity check at cpufreq_boost_trigger_state() entrance [to test if boost is supported] - Use either HW (boost_enable) callback or SW managed boost - Introduce new cpufreq_boost_trigger_state_sw() method to handle boost at SW. - Protect boost_enabled manipulation with lock. Changes for v3: - Method for reading boost status - Removal of cpufreq_frequency_table_max() - Extent cpufreq_frequency_table_cpuinfo() to support boost parameter - boost_supported flag added to cpufreq_driver struct - "boost" sysfs attribute control flag removed - One global flag describing state of the boost defined at cpufreq core - Rename cpufreq_driver's low_level_boost field to set_boost_freq() - Usage of cpufreq_sysfs_{remove|add}_file() routines Changes for v2: - Removal of cpufreq_boost structure and move its fields to cpufreq_driver structure - Flag to indicate if global boost attribute is already defined - Extent the pr_{err|debbug} functions to show current function names drivers/cpufreq/cpufreq.c | 118 +++++++++++++++++++++++++++++++++++++++++- drivers/cpufreq/freq_table.c | 53 ++++++++++++++++--- include/linux/cpufreq.h | 25 +++++++++ 3 files changed, 188 insertions(+), 8 deletions(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 5c75e31..b8b70a1 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -344,6 +344,33 @@ EXPORT_SYMBOL_GPL(cpufreq_notify_transition); /********************************************************************* * SYSFS INTERFACE * *********************************************************************/ +ssize_t show_boost(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); +} + +static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + int ret, enable; + + ret = sscanf(buf, "%d", &enable); + if (ret != 1 || enable < 0 || enable > 1) + return -EINVAL; + + if (cpufreq_boost_trigger_state(enable)) { + pr_err("%s: Cannot %s BOOST!\n", __func__, + enable ? "enable" : "disable"); + return -EINVAL; + } + + pr_debug("%s: cpufreq BOOST %s\n", __func__, + enable ? "enabled" : "disabled"); + + return count; +} +define_one_global_rw(boost); static struct cpufreq_governor *__find_governor(const char *str_governor) { @@ -2010,6 +2037,73 @@ static struct notifier_block __refdata cpufreq_cpu_notifier = { }; /********************************************************************* + * BOOST * + *********************************************************************/ +static int cpufreq_boost_set_sw(int state) +{ + struct cpufreq_frequency_table *freq_table; + struct cpufreq_policy *policy; + int ret = -EINVAL; + + list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { + freq_table = cpufreq_frequency_get_table(policy->cpu); + if (freq_table) { + ret = cpufreq_frequency_table_cpuinfo(policy, + freq_table); + if (ret) { + pr_err("%s: Policy frequency update failed\n", + __func__); + break; + } + policy->user_policy.max = policy->max; + __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + } + } + + return ret; +} + +int cpufreq_boost_trigger_state(int state) +{ + unsigned long flags; + int ret = 0; + + if (cpufreq_driver->boost_enabled == state) + return 0; + + write_lock_irqsave(&cpufreq_driver_lock, flags); + cpufreq_driver->boost_enabled = state; + write_unlock_irqrestore(&cpufreq_driver_lock, flags); + + ret = cpufreq_driver->set_boost(state); + if (ret) { + write_lock_irqsave(&cpufreq_driver_lock, flags); + cpufreq_driver->boost_enabled = !state; + write_unlock_irqrestore(&cpufreq_driver_lock, flags); + + pr_err("%s: Cannot %s BOOST\n", __func__, + state ? "enable" : "disable"); + } + + return ret; +} + +int cpufreq_boost_supported(void) +{ + if (likely(cpufreq_driver)) + return cpufreq_driver->boost_supported; + + return 0; +} +EXPORT_SYMBOL_GPL(cpufreq_boost_supported); + +int cpufreq_boost_enabled(void) +{ + return cpufreq_driver->boost_enabled; +} +EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); + +/********************************************************************* * REGISTER / UNREGISTER CPUFREQ DRIVER * *********************************************************************/ @@ -2048,9 +2142,25 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) cpufreq_driver = driver_data; write_unlock_irqrestore(&cpufreq_driver_lock, flags); + if (cpufreq_boost_supported()) { + /* + * Check if driver provides function to enable boost - + * if not, use cpufreq_boost_set_sw as default + */ + if (!cpufreq_driver->set_boost) + cpufreq_driver->set_boost = cpufreq_boost_set_sw; + + ret = cpufreq_sysfs_create_file(&boost.attr); + if (ret) { + pr_err("%s: cannot register global BOOST sysfs file\n", + __func__); + goto err_null_driver; + } + } + ret = subsys_interface_register(&cpufreq_interface); if (ret) - goto err_null_driver; + goto err_boost_unreg; if (!(cpufreq_driver->flags & CPUFREQ_STICKY)) { int i; @@ -2077,6 +2187,9 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) return 0; err_if_unreg: subsys_interface_unregister(&cpufreq_interface); +err_boost_unreg: + if (cpufreq_boost_supported()) + cpufreq_sysfs_remove_file(&boost.attr); err_null_driver: write_lock_irqsave(&cpufreq_driver_lock, flags); cpufreq_driver = NULL; @@ -2103,6 +2216,9 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver) pr_debug("unregistering driver %s\n", driver->name); subsys_interface_unregister(&cpufreq_interface); + if (cpufreq_boost_supported()) + cpufreq_sysfs_remove_file(&boost.attr); + unregister_hotcpu_notifier(&cpufreq_cpu_notifier); down_write(&cpufreq_rwsem); diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c index f111454a..d7eed63 100644 --- a/drivers/cpufreq/freq_table.c +++ b/drivers/cpufreq/freq_table.c @@ -32,6 +32,10 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, continue; } + if (!cpufreq_boost_enabled() + && table[i].driver_data == CPUFREQ_BOOST_FREQ) + continue; + pr_debug("table entry %u: %u kHz, %u driver_data\n", i, freq, table[i].driver_data); if (freq < min_freq) @@ -169,7 +173,8 @@ static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table); /** * show_available_freqs - show available frequencies for the specified CPU */ -static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf) +static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf, + bool show_boost) { unsigned int i = 0; unsigned int cpu = policy->cpu; @@ -184,6 +189,20 @@ static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf) for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { if (table[i].frequency == CPUFREQ_ENTRY_INVALID) continue; + /* + * show_boost = true and driver_data = BOOST freq + * display BOOST freqs + * + * show_boost = false and driver_data = BOOST freq + * show_boost = true and driver_data != BOOST freq + * continue - do not display anything + * + * show_boost = false and driver_data != BOOST freq + * display NON BOOST freqs + */ + if (show_boost ^ (table[i].driver_data == CPUFREQ_BOOST_FREQ)) + continue; + count += sprintf(&buf[count], "%d ", table[i].frequency); } count += sprintf(&buf[count], "\n"); @@ -192,14 +211,34 @@ static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf) } -struct freq_attr cpufreq_freq_attr_scaling_available_freqs = { - .attr = { .name = "scaling_available_frequencies", - .mode = 0444, - }, - .show = show_available_freqs, -}; +#define cpufreq_attr_available_freq(_name) \ +struct freq_attr cpufreq_freq_attr_##_name##_freqs = \ +__ATTR_RO(_name##_frequencies) + +/** + * show_scaling_available_frequencies - show available normal frequencies for + * the specified CPU + */ +static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy, + char *buf) +{ + return show_available_freqs(policy, buf, false); +} +cpufreq_attr_available_freq(scaling_available); EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs); +/** + * show_available_boost_freqs - show available boost frequencies for + * the specified CPU + */ +static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy, + char *buf) +{ + return show_available_freqs(policy, buf, true); +} +cpufreq_attr_available_freq(scaling_boost); +EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs); + /* * if you use these, you must assure that the frequency table is valid * all the time between get_attr and put_attr! diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index d568f39..541d032 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -209,6 +209,11 @@ struct cpufreq_driver { int (*suspend) (struct cpufreq_policy *policy); int (*resume) (struct cpufreq_policy *policy); struct freq_attr **attr; + + /* platform specific boost support code */ + bool boost_supported; + bool boost_enabled; + int (*set_boost) (int state); }; /* flags */ @@ -381,6 +386,7 @@ extern struct cpufreq_governor cpufreq_gov_conservative; #define CPUFREQ_ENTRY_INVALID ~0 #define CPUFREQ_TABLE_END ~1 +#define CPUFREQ_BOOST_FREQ ~2 struct cpufreq_frequency_table { unsigned int driver_data; /* driver specific data, not used by core */ @@ -403,11 +409,30 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy, void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy); ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); +#ifdef CONFIG_CPU_FREQ +int cpufreq_boost_trigger_state(int state); +int cpufreq_boost_supported(void); +int cpufreq_boost_enabled(void); +#else +static inline int cpufreq_boost_trigger_state(int state) +{ + return 0; +} +static inline int cpufreq_boost_supported(void) +{ + return 0; +} +static inline int cpufreq_boost_enabled(void) +{ + return 0; +} +#endif /* the following funtion is for cpufreq core use only */ struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); /* the following are really really optional */ extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; +extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, unsigned int cpu); void cpufreq_frequency_table_put_attr(unsigned int cpu); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/