From 2d74c6d565567e72c6ea303a452473c8fa7141e4 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 21 Apr 2016 14:28:53 +0530 Subject: PM / OPP: Propagate the error returned by _find_opp_table() Don't send -EINVAL and propagate what's received from _find_opp_table(). Signed-off-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index ba2bdbd932ef..b7411a3cdcb1 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -131,7 +131,7 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) opp_table = _find_opp_table(cpu_dev); if (IS_ERR(opp_table)) { - ret = -EINVAL; + ret = PTR_ERR(opp_table); goto unlock; } -- cgit v1.2.1 From 45ca36ad7cd5784c6326504a8f54df4cccaa8852 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 21 Apr 2016 14:28:54 +0530 Subject: PM / OPP: Add missing doc style comments Few of the routines in cpu.c were missing these, add them. Signed-off-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/cpu.c | 59 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index b7411a3cdcb1..b151401d1513 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -119,7 +119,22 @@ void dev_pm_opp_free_cpufreq_table(struct device *dev, EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); #endif /* CONFIG_CPU_FREQ */ -/* Required only for V1 bindings, as v2 can manage it from DT itself */ +/** + * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev + * + * This marks OPP table of the @cpu_dev as shared by the CPUs present in + * @cpumask. + * + * Returns -ENODEV if OPP table isn't already present. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) { struct opp_device *opp_dev; @@ -161,6 +176,18 @@ unlock: EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); #ifdef CONFIG_OF +/** + * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be removed + * + * This removes the OPP tables for CPUs present in the @cpumask. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask) { struct device *cpu_dev; @@ -181,6 +208,18 @@ void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask) } EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); +/** + * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be added. + * + * This adds the OPP tables for CPUs present in the @cpumask. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask) { struct device *cpu_dev; @@ -216,6 +255,24 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); * * Returns -ENOENT if operating-points-v2 bindings aren't supported. */ +/** + * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with + * @cpu_dev using operating-points-v2 + * bindings. + * + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask to update with information of sharing CPUs + * + * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. + * + * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) { struct device_node *np, *tmp_np; -- cgit v1.2.1 From 2c93104ff2d678b22bb8d5ca502ac5df21a68f69 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 21 Apr 2016 14:28:56 +0530 Subject: PM / OPP: Relocate dev_pm_opp_set_sharing_cpus() Move dev_pm_opp_set_sharing_cpus() towards the end of the file. This is required for better readability after the next patch is applied, which adds dev_pm_opp_get_sharing_cpus(). Signed-off-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/cpu.c | 112 +++++++++++++++++++++---------------------- 1 file changed, 56 insertions(+), 56 deletions(-) (limited to 'drivers') diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index b151401d1513..491e8684bd5f 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -119,62 +119,6 @@ void dev_pm_opp_free_cpufreq_table(struct device *dev, EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); #endif /* CONFIG_CPU_FREQ */ -/** - * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs - * @cpu_dev: CPU device for which we do this operation - * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev - * - * This marks OPP table of the @cpu_dev as shared by the CPUs present in - * @cpumask. - * - * Returns -ENODEV if OPP table isn't already present. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function internally uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - */ -int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) -{ - struct opp_device *opp_dev; - struct opp_table *opp_table; - struct device *dev; - int cpu, ret = 0; - - mutex_lock(&opp_table_lock); - - opp_table = _find_opp_table(cpu_dev); - if (IS_ERR(opp_table)) { - ret = PTR_ERR(opp_table); - goto unlock; - } - - for_each_cpu(cpu, cpumask) { - if (cpu == cpu_dev->id) - continue; - - dev = get_cpu_device(cpu); - if (!dev) { - dev_err(cpu_dev, "%s: failed to get cpu%d device\n", - __func__, cpu); - continue; - } - - opp_dev = _add_opp_dev(dev, opp_table); - if (!opp_dev) { - dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n", - __func__, cpu); - continue; - } - } -unlock: - mutex_unlock(&opp_table_lock); - - return ret; -} -EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); - #ifdef CONFIG_OF /** * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask @@ -326,3 +270,59 @@ put_cpu_node: } EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); #endif + +/** + * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev + * + * This marks OPP table of the @cpu_dev as shared by the CPUs present in + * @cpumask. + * + * Returns -ENODEV if OPP table isn't already present. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +{ + struct opp_device *opp_dev; + struct opp_table *opp_table; + struct device *dev; + int cpu, ret = 0; + + mutex_lock(&opp_table_lock); + + opp_table = _find_opp_table(cpu_dev); + if (IS_ERR(opp_table)) { + ret = PTR_ERR(opp_table); + goto unlock; + } + + for_each_cpu(cpu, cpumask) { + if (cpu == cpu_dev->id) + continue; + + dev = get_cpu_device(cpu); + if (!dev) { + dev_err(cpu_dev, "%s: failed to get cpu%d device\n", + __func__, cpu); + continue; + } + + opp_dev = _add_opp_dev(dev, opp_table); + if (!opp_dev) { + dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n", + __func__, cpu); + continue; + } + } +unlock: + mutex_unlock(&opp_table_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); -- cgit v1.2.1 From 46e7a4e18397649fe1b9007ad99707d960eb138e Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 21 Apr 2016 14:28:57 +0530 Subject: PM / OPP: Mark shared-opp for non-dt case opp core allows OPPs to be explicitly marked as shared from platform code, in case of operating-point v1 bindings. Though we do everything fine in that case, we don't set the flag in the opp-table to indicate that the OPPs are shared. It works fine today as the flag isn't used anywhere else in the core, but we should be doing the right thing by marking it set. Signed-off-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/cpu.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers') diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 491e8684bd5f..55cbf9bd8707 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -319,6 +319,9 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) __func__, cpu); continue; } + + /* Mark opp-table as multiple CPUs are sharing it now */ + opp_table->shared_opp = true; } unlock: mutex_unlock(&opp_table_lock); -- cgit v1.2.1 From dde370b23c1787a9c723ac049d56a3014937f889 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 27 Apr 2016 08:52:22 +0530 Subject: PM / OPP: Mark cpumask as const in dev_pm_opp_set_sharing_cpus() dev_pm_opp_set_sharing_cpus() isn't supposed to update the cpumask passed as its parameter, and so it should always have been marked 'const'. Do it now. Signed-off-by: Viresh Kumar Acked-by: Arnd Bergmann Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/cpu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 55cbf9bd8707..5469e7730ff2 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -287,7 +287,8 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, + const cpumask_var_t cpumask) { struct opp_device *opp_dev; struct opp_table *opp_table; -- cgit v1.2.1 From 6f707daa3833761110a03478cba5cc4b708ec77d Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 27 Apr 2016 08:52:23 +0530 Subject: PM / OPP: Add dev_pm_opp_get_sharing_cpus() OPP core allows a platform to mark OPP table as shared, when the platform isn't using operating-points-v2 bindings. And, so there should be a non DT way of finding out if the OPP table is shared or not. This patch adds dev_pm_opp_get_sharing_cpus(), which first tries to get OPP sharing information from the opp-table (in case it is already marked as shared), otherwise it uses the existing DT way of finding sharing information. Signed-off-by: Viresh Kumar Acked-by: Arnd Bergmann Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/cpu.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) (limited to 'drivers') diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 5469e7730ff2..3428380dfca7 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -330,3 +330,48 @@ unlock: return ret; } EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); + +/** + * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask to update with information of sharing CPUs + * + * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. + * + * Returns -ENODEV if OPP table isn't already present. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +{ + struct opp_device *opp_dev; + struct opp_table *opp_table; + int ret = 0; + + mutex_lock(&opp_table_lock); + + opp_table = _find_opp_table(cpu_dev); + if (IS_ERR(opp_table)) { + ret = PTR_ERR(opp_table); + goto unlock; + } + + cpumask_clear(cpumask); + + if (opp_table->shared_opp) { + list_for_each_entry(opp_dev, &opp_table->dev_list, node) + cpumask_set_cpu(opp_dev->dev->id, cpumask); + } else { + cpumask_set_cpu(cpu_dev->id, cpumask); + } + +unlock: + mutex_unlock(&opp_table_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus); -- cgit v1.2.1 From ddbb74bc70c0dbaab85d1aa2564b0b3217267454 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Sat, 30 Apr 2016 13:33:29 +0200 Subject: PM / OPP: pass cpumask by reference The new use of dev_pm_opp_set_sharing_cpus resulted in a harmless compiler warning with CONFIG_CPUMASK_OFFSTACK=y: drivers/cpufreq/mvebu-cpufreq.c: In function 'armada_xp_pmsu_cpufreq_init': include/linux/cpumask.h:550:25: error: passing argument 2 of 'dev_pm_opp_set_sharing_cpus' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] The problem here is that cpumask_var_t gets passed by reference, but by declaring a 'const cpumask_var_t' argument, only the pointer is constant, not the actual mask. This is harmless because the function does not actually modify the mask. This patch changes the function prototypes for all of the related functions to pass a 'struct cpumask *' instead of 'cpumask_var_t', matching what most other such functions do in the kernel. This lets us mark all the other similar functions as taking a 'const' mask where possible, and it avoids the warning without any change in object code. Signed-off-by: Arnd Bergmann Fixes: 947bd567f7a5 (mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared) Acked-by: Pavel Machek Acked-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/cpu.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers') diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 3428380dfca7..8e0b6349d7d4 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -132,7 +132,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask) +void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) { struct device *cpu_dev; int cpu; @@ -164,7 +164,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask) +int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) { struct device *cpu_dev; int cpu, ret = 0; @@ -217,7 +217,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { struct device_node *np, *tmp_np; struct device *tcpu_dev; @@ -288,7 +288,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); * mutex cannot be locked. */ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, - const cpumask_var_t cpumask) + const struct cpumask *cpumask) { struct opp_device *opp_dev; struct opp_table *opp_table; @@ -346,7 +346,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { struct opp_device *opp_dev; struct opp_table *opp_table; -- cgit v1.2.1 From 411466c5081d2f649b3583cae0f6c9ad5edec636 Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Tue, 3 May 2016 15:05:04 +0100 Subject: PM / OPP: add non-OF versions of dev_pm_opp_{cpumask_, }remove_table Functions dev_pm_opp_of_{cpumask_,}remove_table removes/frees all the static OPP entries associated with the device and/or all cpus(in case of cpumask) that are created from DT. However the OPP entries are populated reading from the firmware or some different method using dev_pm_opp_add are marked dynamic and can't be removed using above functions. This patch adds non DT/OF versions of dev_pm_opp_{cpumask_,}remove_table to support the above mentioned usecase. This is in preparation to make use of the same in scpi-cpufreq.c Signed-off-by: Sudeep Holla Acked-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/core.c | 58 ++++++++++++++++++++++++++++++----------- drivers/base/power/opp/cpu.c | 60 ++++++++++++++++++++++++++++++++----------- 2 files changed, 88 insertions(+), 30 deletions(-) (limited to 'drivers') diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 433b60092972..9f8bf04b4dbe 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -1845,21 +1845,11 @@ struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev) } EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier); -#ifdef CONFIG_OF -/** - * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT - * entries - * @dev: device pointer used to lookup OPP table. - * - * Free OPPs created using static entries present in DT. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function indirectly uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. +/* + * Free OPPs either created using static entries present in DT or even the + * dynamically added entries based on remove_all param. */ -void dev_pm_opp_of_remove_table(struct device *dev) +static void _dev_pm_opp_remove_table(struct device *dev, bool remove_all) { struct opp_table *opp_table; struct dev_pm_opp *opp, *tmp; @@ -1884,7 +1874,7 @@ void dev_pm_opp_of_remove_table(struct device *dev) if (list_is_singular(&opp_table->dev_list)) { /* Free static OPPs */ list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { - if (!opp->dynamic) + if (remove_all || !opp->dynamic) _opp_remove(opp_table, opp, true); } } else { @@ -1894,6 +1884,44 @@ void dev_pm_opp_of_remove_table(struct device *dev) unlock: mutex_unlock(&opp_table_lock); } + +/** + * dev_pm_opp_remove_table() - Free all OPPs associated with the device + * @dev: device pointer used to lookup OPP table. + * + * Free both OPPs created using static entries present in DT and the + * dynamically added entries. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function indirectly uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +void dev_pm_opp_remove_table(struct device *dev) +{ + _dev_pm_opp_remove_table(dev, true); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); + +#ifdef CONFIG_OF +/** + * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT + * entries + * @dev: device pointer used to lookup OPP table. + * + * Free OPPs created using static entries present in DT. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function indirectly uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +void dev_pm_opp_of_remove_table(struct device *dev) +{ + _dev_pm_opp_remove_table(dev, false); +} EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); /* Returns opp descriptor node for a device, caller must do of_node_put() */ diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 8e0b6349d7d4..357781e0b791 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -119,20 +119,8 @@ void dev_pm_opp_free_cpufreq_table(struct device *dev, EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); #endif /* CONFIG_CPU_FREQ */ -#ifdef CONFIG_OF -/** - * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask - * @cpumask: cpumask for which OPP table needs to be removed - * - * This removes the OPP tables for CPUs present in the @cpumask. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function internally uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - */ -void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) +static void +_dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of) { struct device *cpu_dev; int cpu; @@ -147,9 +135,51 @@ void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) continue; } - dev_pm_opp_of_remove_table(cpu_dev); + if (of) + dev_pm_opp_of_remove_table(cpu_dev); + else + dev_pm_opp_remove_table(cpu_dev); } } + +/** + * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be removed + * + * This removes the OPP tables for CPUs present in the @cpumask. + * This should be used to remove all the OPPs entries associated with + * the cpus in @cpumask. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask) +{ + _dev_pm_opp_cpumask_remove_table(cpumask, false); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table); + +#ifdef CONFIG_OF +/** + * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be removed + * + * This removes the OPP tables for CPUs present in the @cpumask. + * This should be used only to remove static entries created from DT. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) +{ + _dev_pm_opp_cpumask_remove_table(cpumask, true); +} EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); /** -- cgit v1.2.1 From f47b72a15a9679dd4dc1af681d4d2f1ca2815552 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 5 May 2016 16:20:33 +0530 Subject: PM / OPP: Move CONFIG_OF dependent code in a separate file Recently, a few issues were noticed in the code where CONFIG_OF wasn't consistently used for many routines. The core file is big enough now and ifdef hackery makes it less readable. Move OF-specific code to another file and compile that only if CONFIG_OF is enabled. Compile-tested: - For ARM (exynos) with CONFIG_OF enabled - For X86 with CONFIG_OF disabled (have to enable CONFIG_PM_OPP separately) No functional changes. Signed-off-by: Viresh Kumar Tested-by: Sudeep Holla Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/Makefile | 1 + drivers/base/power/opp/core.c | 448 +----------------------------- drivers/base/power/opp/cpu.c | 143 +--------- drivers/base/power/opp/of.c | 591 ++++++++++++++++++++++++++++++++++++++++ drivers/base/power/opp/opp.h | 14 + 5 files changed, 618 insertions(+), 579 deletions(-) create mode 100644 drivers/base/power/opp/of.c (limited to 'drivers') diff --git a/drivers/base/power/opp/Makefile b/drivers/base/power/opp/Makefile index 19837ef04d8e..e70ceb406fe9 100644 --- a/drivers/base/power/opp/Makefile +++ b/drivers/base/power/opp/Makefile @@ -1,3 +1,4 @@ ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG obj-y += core.o cpu.o +obj-$(CONFIG_OF) += of.o obj-$(CONFIG_DEBUG_FS) += debugfs.o diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 9f8bf04b4dbe..f98b01a3a4e7 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -18,7 +18,6 @@ #include #include #include -#include #include #include @@ -29,7 +28,7 @@ * from here, with each opp_table containing the list of opps it supports in * various states of availability. */ -static LIST_HEAD(opp_tables); +LIST_HEAD(opp_tables); /* Lock to allow exclusive modification to the device and opp lists */ DEFINE_MUTEX(opp_table_lock); @@ -53,26 +52,6 @@ static struct opp_device *_find_opp_dev(const struct device *dev, return NULL; } -static struct opp_table *_managed_opp(const struct device_node *np) -{ - struct opp_table *opp_table; - - list_for_each_entry_rcu(opp_table, &opp_tables, node) { - if (opp_table->np == np) { - /* - * Multiple devices can point to the same OPP table and - * so will have same node-pointer, np. - * - * But the OPPs will be considered as shared only if the - * OPP table contains a "opp-shared" property. - */ - return opp_table->shared_opp ? opp_table : NULL; - } - } - - return NULL; -} - /** * _find_opp_table() - find opp_table struct using device pointer * @dev: device pointer used to lookup OPP table @@ -760,7 +739,6 @@ static struct opp_table *_add_opp_table(struct device *dev) { struct opp_table *opp_table; struct opp_device *opp_dev; - struct device_node *np; int ret; /* Check for existing table for 'dev' first */ @@ -784,20 +762,7 @@ static struct opp_table *_add_opp_table(struct device *dev) return NULL; } - /* - * Only required for backward compatibility with v1 bindings, but isn't - * harmful for other cases. And so we do it unconditionally. - */ - np = of_node_get(dev->of_node); - if (np) { - u32 val; - - if (!of_property_read_u32(np, "clock-latency", &val)) - opp_table->clock_latency_ns_max = val; - of_property_read_u32(np, "voltage-tolerance", - &opp_table->voltage_tolerance_v1); - of_node_put(np); - } + _of_init_opp_table(opp_table, dev); /* Set regulator to a non-NULL error value */ opp_table->regulator = ERR_PTR(-ENXIO); @@ -893,8 +858,8 @@ static void _kfree_opp_rcu(struct rcu_head *head) * It is assumed that the caller holds required mutex for an RCU updater * strategy. */ -static void _opp_remove(struct opp_table *opp_table, - struct dev_pm_opp *opp, bool notify) +void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp, + bool notify) { /* * Notify the changes in the availability of the operable @@ -955,8 +920,8 @@ unlock: } EXPORT_SYMBOL_GPL(dev_pm_opp_remove); -static struct dev_pm_opp *_allocate_opp(struct device *dev, - struct opp_table **opp_table) +struct dev_pm_opp *_allocate_opp(struct device *dev, + struct opp_table **opp_table) { struct dev_pm_opp *opp; @@ -992,8 +957,8 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, return true; } -static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, - struct opp_table *opp_table) +int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, + struct opp_table *opp_table) { struct dev_pm_opp *opp; struct list_head *head = &opp_table->opp_list; @@ -1069,8 +1034,8 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, * Duplicate OPPs (both freq and volt are same) and !opp->available * -ENOMEM Memory allocation failure */ -static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, - bool dynamic) +int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, + bool dynamic) { struct opp_table *opp_table; struct dev_pm_opp *new_opp; @@ -1115,83 +1080,6 @@ unlock: return ret; } -/* TODO: Support multiple regulators */ -static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, - struct opp_table *opp_table) -{ - u32 microvolt[3] = {0}; - u32 val; - int count, ret; - struct property *prop = NULL; - char name[NAME_MAX]; - - /* Search for "opp-microvolt-" */ - if (opp_table->prop_name) { - snprintf(name, sizeof(name), "opp-microvolt-%s", - opp_table->prop_name); - prop = of_find_property(opp->np, name, NULL); - } - - if (!prop) { - /* Search for "opp-microvolt" */ - sprintf(name, "opp-microvolt"); - prop = of_find_property(opp->np, name, NULL); - - /* Missing property isn't a problem, but an invalid entry is */ - if (!prop) - return 0; - } - - count = of_property_count_u32_elems(opp->np, name); - if (count < 0) { - dev_err(dev, "%s: Invalid %s property (%d)\n", - __func__, name, count); - return count; - } - - /* There can be one or three elements here */ - if (count != 1 && count != 3) { - dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n", - __func__, name, count); - return -EINVAL; - } - - ret = of_property_read_u32_array(opp->np, name, microvolt, count); - if (ret) { - dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); - return -EINVAL; - } - - opp->u_volt = microvolt[0]; - - if (count == 1) { - opp->u_volt_min = opp->u_volt; - opp->u_volt_max = opp->u_volt; - } else { - opp->u_volt_min = microvolt[1]; - opp->u_volt_max = microvolt[2]; - } - - /* Search for "opp-microamp-" */ - prop = NULL; - if (opp_table->prop_name) { - snprintf(name, sizeof(name), "opp-microamp-%s", - opp_table->prop_name); - prop = of_find_property(opp->np, name, NULL); - } - - if (!prop) { - /* Search for "opp-microamp" */ - sprintf(name, "opp-microamp"); - prop = of_find_property(opp->np, name, NULL); - } - - if (prop && !of_property_read_u32(opp->np, name, &val)) - opp->u_amp = val; - - return 0; -} - /** * dev_pm_opp_set_supported_hw() - Set supported platforms * @dev: Device for which supported-hw has to be set. @@ -1520,144 +1408,6 @@ unlock: } EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator); -static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, - struct device_node *np) -{ - unsigned int count = opp_table->supported_hw_count; - u32 version; - int ret; - - if (!opp_table->supported_hw) - return true; - - while (count--) { - ret = of_property_read_u32_index(np, "opp-supported-hw", count, - &version); - if (ret) { - dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", - __func__, count, ret); - return false; - } - - /* Both of these are bitwise masks of the versions */ - if (!(version & opp_table->supported_hw[count])) - return false; - } - - return true; -} - -/** - * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) - * @dev: device for which we do this operation - * @np: device node - * - * This function adds an opp definition to the opp table and returns status. The - * opp can be controlled using dev_pm_opp_enable/disable functions and may be - * removed by dev_pm_opp_remove. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function internally uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - * - * Return: - * 0 On success OR - * Duplicate OPPs (both freq and volt are same) and opp->available - * -EEXIST Freq are same and volt are different OR - * Duplicate OPPs (both freq and volt are same) and !opp->available - * -ENOMEM Memory allocation failure - * -EINVAL Failed parsing the OPP node - */ -static int _opp_add_static_v2(struct device *dev, struct device_node *np) -{ - struct opp_table *opp_table; - struct dev_pm_opp *new_opp; - u64 rate; - u32 val; - int ret; - - /* Hold our table modification lock here */ - mutex_lock(&opp_table_lock); - - new_opp = _allocate_opp(dev, &opp_table); - if (!new_opp) { - ret = -ENOMEM; - goto unlock; - } - - ret = of_property_read_u64(np, "opp-hz", &rate); - if (ret < 0) { - dev_err(dev, "%s: opp-hz not found\n", __func__); - goto free_opp; - } - - /* Check if the OPP supports hardware's hierarchy of versions or not */ - if (!_opp_is_supported(dev, opp_table, np)) { - dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); - goto free_opp; - } - - /* - * Rate is defined as an unsigned long in clk API, and so casting - * explicitly to its type. Must be fixed once rate is 64 bit - * guaranteed in clk API. - */ - new_opp->rate = (unsigned long)rate; - new_opp->turbo = of_property_read_bool(np, "turbo-mode"); - - new_opp->np = np; - new_opp->dynamic = false; - new_opp->available = true; - - if (!of_property_read_u32(np, "clock-latency-ns", &val)) - new_opp->clock_latency_ns = val; - - ret = opp_parse_supplies(new_opp, dev, opp_table); - if (ret) - goto free_opp; - - ret = _opp_add(dev, new_opp, opp_table); - if (ret) - goto free_opp; - - /* OPP to select on device suspend */ - if (of_property_read_bool(np, "opp-suspend")) { - if (opp_table->suspend_opp) { - dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", - __func__, opp_table->suspend_opp->rate, - new_opp->rate); - } else { - new_opp->suspend = true; - opp_table->suspend_opp = new_opp; - } - } - - if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) - opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; - - mutex_unlock(&opp_table_lock); - - pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", - __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt, - new_opp->u_volt_min, new_opp->u_volt_max, - new_opp->clock_latency_ns); - - /* - * Notify the changes in the availability of the operable - * frequency/voltage list. - */ - srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp); - return 0; - -free_opp: - _opp_remove(opp_table, new_opp, false); -unlock: - mutex_unlock(&opp_table_lock); - return ret; -} - /** * dev_pm_opp_add() - Add an OPP table from a table definitions * @dev: device for which we do this operation @@ -1849,7 +1599,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier); * Free OPPs either created using static entries present in DT or even the * dynamically added entries based on remove_all param. */ -static void _dev_pm_opp_remove_table(struct device *dev, bool remove_all) +void _dev_pm_opp_remove_table(struct device *dev, bool remove_all) { struct opp_table *opp_table; struct dev_pm_opp *opp, *tmp; @@ -1903,179 +1653,3 @@ void dev_pm_opp_remove_table(struct device *dev) _dev_pm_opp_remove_table(dev, true); } EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); - -#ifdef CONFIG_OF -/** - * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT - * entries - * @dev: device pointer used to lookup OPP table. - * - * Free OPPs created using static entries present in DT. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function indirectly uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - */ -void dev_pm_opp_of_remove_table(struct device *dev) -{ - _dev_pm_opp_remove_table(dev, false); -} -EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); - -/* Returns opp descriptor node for a device, caller must do of_node_put() */ -struct device_node *_of_get_opp_desc_node(struct device *dev) -{ - /* - * TODO: Support for multiple OPP tables. - * - * There should be only ONE phandle present in "operating-points-v2" - * property. - */ - - return of_parse_phandle(dev->of_node, "operating-points-v2", 0); -} - -/* Initializes OPP tables based on new bindings */ -static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np) -{ - struct device_node *np; - struct opp_table *opp_table; - int ret = 0, count = 0; - - mutex_lock(&opp_table_lock); - - opp_table = _managed_opp(opp_np); - if (opp_table) { - /* OPPs are already managed */ - if (!_add_opp_dev(dev, opp_table)) - ret = -ENOMEM; - mutex_unlock(&opp_table_lock); - return ret; - } - mutex_unlock(&opp_table_lock); - - /* We have opp-table node now, iterate over it and add OPPs */ - for_each_available_child_of_node(opp_np, np) { - count++; - - ret = _opp_add_static_v2(dev, np); - if (ret) { - dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, - ret); - goto free_table; - } - } - - /* There should be one of more OPP defined */ - if (WARN_ON(!count)) - return -ENOENT; - - mutex_lock(&opp_table_lock); - - opp_table = _find_opp_table(dev); - if (WARN_ON(IS_ERR(opp_table))) { - ret = PTR_ERR(opp_table); - mutex_unlock(&opp_table_lock); - goto free_table; - } - - opp_table->np = opp_np; - opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared"); - - mutex_unlock(&opp_table_lock); - - return 0; - -free_table: - dev_pm_opp_of_remove_table(dev); - - return ret; -} - -/* Initializes OPP tables based on old-deprecated bindings */ -static int _of_add_opp_table_v1(struct device *dev) -{ - const struct property *prop; - const __be32 *val; - int nr; - - prop = of_find_property(dev->of_node, "operating-points", NULL); - if (!prop) - return -ENODEV; - if (!prop->value) - return -ENODATA; - - /* - * Each OPP is a set of tuples consisting of frequency and - * voltage like . - */ - nr = prop->length / sizeof(u32); - if (nr % 2) { - dev_err(dev, "%s: Invalid OPP table\n", __func__); - return -EINVAL; - } - - val = prop->value; - while (nr) { - unsigned long freq = be32_to_cpup(val++) * 1000; - unsigned long volt = be32_to_cpup(val++); - - if (_opp_add_v1(dev, freq, volt, false)) - dev_warn(dev, "%s: Failed to add OPP %ld\n", - __func__, freq); - nr -= 2; - } - - return 0; -} - -/** - * dev_pm_opp_of_add_table() - Initialize opp table from device tree - * @dev: device pointer used to lookup OPP table. - * - * Register the initial OPP table with the OPP library for given device. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function indirectly uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - * - * Return: - * 0 On success OR - * Duplicate OPPs (both freq and volt are same) and opp->available - * -EEXIST Freq are same and volt are different OR - * Duplicate OPPs (both freq and volt are same) and !opp->available - * -ENOMEM Memory allocation failure - * -ENODEV when 'operating-points' property is not found or is invalid data - * in device node. - * -ENODATA when empty 'operating-points' property is found - * -EINVAL when invalid entries are found in opp-v2 table - */ -int dev_pm_opp_of_add_table(struct device *dev) -{ - struct device_node *opp_np; - int ret; - - /* - * OPPs have two version of bindings now. The older one is deprecated, - * try for the new binding first. - */ - opp_np = _of_get_opp_desc_node(dev); - if (!opp_np) { - /* - * Try old-deprecated bindings for backward compatibility with - * older dtbs. - */ - return _of_add_opp_table_v1(dev); - } - - ret = _of_add_opp_table_v2(dev, opp_np); - of_node_put(opp_np); - - return ret; -} -EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); -#endif diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 357781e0b791..83d6e7ba1a34 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -18,7 +18,6 @@ #include #include #include -#include #include #include "opp.h" @@ -119,8 +118,7 @@ void dev_pm_opp_free_cpufreq_table(struct device *dev, EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); #endif /* CONFIG_CPU_FREQ */ -static void -_dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of) +void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of) { struct device *cpu_dev; int cpu; @@ -162,145 +160,6 @@ void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask) } EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table); -#ifdef CONFIG_OF -/** - * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask - * @cpumask: cpumask for which OPP table needs to be removed - * - * This removes the OPP tables for CPUs present in the @cpumask. - * This should be used only to remove static entries created from DT. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function internally uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - */ -void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) -{ - _dev_pm_opp_cpumask_remove_table(cpumask, true); -} -EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); - -/** - * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask - * @cpumask: cpumask for which OPP table needs to be added. - * - * This adds the OPP tables for CPUs present in the @cpumask. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function internally uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - */ -int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) -{ - struct device *cpu_dev; - int cpu, ret = 0; - - WARN_ON(cpumask_empty(cpumask)); - - for_each_cpu(cpu, cpumask) { - cpu_dev = get_cpu_device(cpu); - if (!cpu_dev) { - pr_err("%s: failed to get cpu%d device\n", __func__, - cpu); - continue; - } - - ret = dev_pm_opp_of_add_table(cpu_dev); - if (ret) { - pr_err("%s: couldn't find opp table for cpu:%d, %d\n", - __func__, cpu, ret); - - /* Free all other OPPs */ - dev_pm_opp_of_cpumask_remove_table(cpumask); - break; - } - } - - return ret; -} -EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); - -/* - * Works only for OPP v2 bindings. - * - * Returns -ENOENT if operating-points-v2 bindings aren't supported. - */ -/** - * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with - * @cpu_dev using operating-points-v2 - * bindings. - * - * @cpu_dev: CPU device for which we do this operation - * @cpumask: cpumask to update with information of sharing CPUs - * - * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. - * - * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. - * - * Locking: The internal opp_table and opp structures are RCU protected. - * Hence this function internally uses RCU updater strategy with mutex locks - * to keep the integrity of the internal data structures. Callers should ensure - * that this function is *NOT* called under RCU protection or in contexts where - * mutex cannot be locked. - */ -int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) -{ - struct device_node *np, *tmp_np; - struct device *tcpu_dev; - int cpu, ret = 0; - - /* Get OPP descriptor node */ - np = _of_get_opp_desc_node(cpu_dev); - if (!np) { - dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev node.\n", __func__); - return -ENOENT; - } - - cpumask_set_cpu(cpu_dev->id, cpumask); - - /* OPPs are shared ? */ - if (!of_property_read_bool(np, "opp-shared")) - goto put_cpu_node; - - for_each_possible_cpu(cpu) { - if (cpu == cpu_dev->id) - continue; - - tcpu_dev = get_cpu_device(cpu); - if (!tcpu_dev) { - dev_err(cpu_dev, "%s: failed to get cpu%d device\n", - __func__, cpu); - ret = -ENODEV; - goto put_cpu_node; - } - - /* Get OPP descriptor node */ - tmp_np = _of_get_opp_desc_node(tcpu_dev); - if (!tmp_np) { - dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n", - __func__); - ret = -ENOENT; - goto put_cpu_node; - } - - /* CPUs are sharing opp node */ - if (np == tmp_np) - cpumask_set_cpu(cpu, cpumask); - - of_node_put(tmp_np); - } - -put_cpu_node: - of_node_put(np); - return ret; -} -EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); -#endif - /** * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs * @cpu_dev: CPU device for which we do this operation diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c new file mode 100644 index 000000000000..94d2010558e3 --- /dev/null +++ b/drivers/base/power/opp/of.c @@ -0,0 +1,591 @@ +/* + * Generic OPP OF helpers + * + * Copyright (C) 2009-2010 Texas Instruments Incorporated. + * Nishanth Menon + * Romit Dasgupta + * Kevin Hilman + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include + +#include "opp.h" + +static struct opp_table *_managed_opp(const struct device_node *np) +{ + struct opp_table *opp_table; + + list_for_each_entry_rcu(opp_table, &opp_tables, node) { + if (opp_table->np == np) { + /* + * Multiple devices can point to the same OPP table and + * so will have same node-pointer, np. + * + * But the OPPs will be considered as shared only if the + * OPP table contains a "opp-shared" property. + */ + return opp_table->shared_opp ? opp_table : NULL; + } + } + + return NULL; +} + +void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) +{ + struct device_node *np; + + /* + * Only required for backward compatibility with v1 bindings, but isn't + * harmful for other cases. And so we do it unconditionally. + */ + np = of_node_get(dev->of_node); + if (np) { + u32 val; + + if (!of_property_read_u32(np, "clock-latency", &val)) + opp_table->clock_latency_ns_max = val; + of_property_read_u32(np, "voltage-tolerance", + &opp_table->voltage_tolerance_v1); + of_node_put(np); + } +} + +static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, + struct device_node *np) +{ + unsigned int count = opp_table->supported_hw_count; + u32 version; + int ret; + + if (!opp_table->supported_hw) + return true; + + while (count--) { + ret = of_property_read_u32_index(np, "opp-supported-hw", count, + &version); + if (ret) { + dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", + __func__, count, ret); + return false; + } + + /* Both of these are bitwise masks of the versions */ + if (!(version & opp_table->supported_hw[count])) + return false; + } + + return true; +} + +/* TODO: Support multiple regulators */ +static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, + struct opp_table *opp_table) +{ + u32 microvolt[3] = {0}; + u32 val; + int count, ret; + struct property *prop = NULL; + char name[NAME_MAX]; + + /* Search for "opp-microvolt-" */ + if (opp_table->prop_name) { + snprintf(name, sizeof(name), "opp-microvolt-%s", + opp_table->prop_name); + prop = of_find_property(opp->np, name, NULL); + } + + if (!prop) { + /* Search for "opp-microvolt" */ + sprintf(name, "opp-microvolt"); + prop = of_find_property(opp->np, name, NULL); + + /* Missing property isn't a problem, but an invalid entry is */ + if (!prop) + return 0; + } + + count = of_property_count_u32_elems(opp->np, name); + if (count < 0) { + dev_err(dev, "%s: Invalid %s property (%d)\n", + __func__, name, count); + return count; + } + + /* There can be one or three elements here */ + if (count != 1 && count != 3) { + dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n", + __func__, name, count); + return -EINVAL; + } + + ret = of_property_read_u32_array(opp->np, name, microvolt, count); + if (ret) { + dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); + return -EINVAL; + } + + opp->u_volt = microvolt[0]; + + if (count == 1) { + opp->u_volt_min = opp->u_volt; + opp->u_volt_max = opp->u_volt; + } else { + opp->u_volt_min = microvolt[1]; + opp->u_volt_max = microvolt[2]; + } + + /* Search for "opp-microamp-" */ + prop = NULL; + if (opp_table->prop_name) { + snprintf(name, sizeof(name), "opp-microamp-%s", + opp_table->prop_name); + prop = of_find_property(opp->np, name, NULL); + } + + if (!prop) { + /* Search for "opp-microamp" */ + sprintf(name, "opp-microamp"); + prop = of_find_property(opp->np, name, NULL); + } + + if (prop && !of_property_read_u32(opp->np, name, &val)) + opp->u_amp = val; + + return 0; +} + +/** + * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT + * entries + * @dev: device pointer used to lookup OPP table. + * + * Free OPPs created using static entries present in DT. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function indirectly uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +void dev_pm_opp_of_remove_table(struct device *dev) +{ + _dev_pm_opp_remove_table(dev, false); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); + +/* Returns opp descriptor node for a device, caller must do of_node_put() */ +struct device_node *_of_get_opp_desc_node(struct device *dev) +{ + /* + * TODO: Support for multiple OPP tables. + * + * There should be only ONE phandle present in "operating-points-v2" + * property. + */ + + return of_parse_phandle(dev->of_node, "operating-points-v2", 0); +} + +/** + * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) + * @dev: device for which we do this operation + * @np: device node + * + * This function adds an opp definition to the opp table and returns status. The + * opp can be controlled using dev_pm_opp_enable/disable functions and may be + * removed by dev_pm_opp_remove. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + * + * Return: + * 0 On success OR + * Duplicate OPPs (both freq and volt are same) and opp->available + * -EEXIST Freq are same and volt are different OR + * Duplicate OPPs (both freq and volt are same) and !opp->available + * -ENOMEM Memory allocation failure + * -EINVAL Failed parsing the OPP node + */ +static int _opp_add_static_v2(struct device *dev, struct device_node *np) +{ + struct opp_table *opp_table; + struct dev_pm_opp *new_opp; + u64 rate; + u32 val; + int ret; + + /* Hold our table modification lock here */ + mutex_lock(&opp_table_lock); + + new_opp = _allocate_opp(dev, &opp_table); + if (!new_opp) { + ret = -ENOMEM; + goto unlock; + } + + ret = of_property_read_u64(np, "opp-hz", &rate); + if (ret < 0) { + dev_err(dev, "%s: opp-hz not found\n", __func__); + goto free_opp; + } + + /* Check if the OPP supports hardware's hierarchy of versions or not */ + if (!_opp_is_supported(dev, opp_table, np)) { + dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); + goto free_opp; + } + + /* + * Rate is defined as an unsigned long in clk API, and so casting + * explicitly to its type. Must be fixed once rate is 64 bit + * guaranteed in clk API. + */ + new_opp->rate = (unsigned long)rate; + new_opp->turbo = of_property_read_bool(np, "turbo-mode"); + + new_opp->np = np; + new_opp->dynamic = false; + new_opp->available = true; + + if (!of_property_read_u32(np, "clock-latency-ns", &val)) + new_opp->clock_latency_ns = val; + + ret = opp_parse_supplies(new_opp, dev, opp_table); + if (ret) + goto free_opp; + + ret = _opp_add(dev, new_opp, opp_table); + if (ret) + goto free_opp; + + /* OPP to select on device suspend */ + if (of_property_read_bool(np, "opp-suspend")) { + if (opp_table->suspend_opp) { + dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", + __func__, opp_table->suspend_opp->rate, + new_opp->rate); + } else { + new_opp->suspend = true; + opp_table->suspend_opp = new_opp; + } + } + + if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) + opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; + + mutex_unlock(&opp_table_lock); + + pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", + __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt, + new_opp->u_volt_min, new_opp->u_volt_max, + new_opp->clock_latency_ns); + + /* + * Notify the changes in the availability of the operable + * frequency/voltage list. + */ + srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp); + return 0; + +free_opp: + _opp_remove(opp_table, new_opp, false); +unlock: + mutex_unlock(&opp_table_lock); + return ret; +} + +/* Initializes OPP tables based on new bindings */ +static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np) +{ + struct device_node *np; + struct opp_table *opp_table; + int ret = 0, count = 0; + + mutex_lock(&opp_table_lock); + + opp_table = _managed_opp(opp_np); + if (opp_table) { + /* OPPs are already managed */ + if (!_add_opp_dev(dev, opp_table)) + ret = -ENOMEM; + mutex_unlock(&opp_table_lock); + return ret; + } + mutex_unlock(&opp_table_lock); + + /* We have opp-table node now, iterate over it and add OPPs */ + for_each_available_child_of_node(opp_np, np) { + count++; + + ret = _opp_add_static_v2(dev, np); + if (ret) { + dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, + ret); + goto free_table; + } + } + + /* There should be one of more OPP defined */ + if (WARN_ON(!count)) + return -ENOENT; + + mutex_lock(&opp_table_lock); + + opp_table = _find_opp_table(dev); + if (WARN_ON(IS_ERR(opp_table))) { + ret = PTR_ERR(opp_table); + mutex_unlock(&opp_table_lock); + goto free_table; + } + + opp_table->np = opp_np; + opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared"); + + mutex_unlock(&opp_table_lock); + + return 0; + +free_table: + dev_pm_opp_of_remove_table(dev); + + return ret; +} + +/* Initializes OPP tables based on old-deprecated bindings */ +static int _of_add_opp_table_v1(struct device *dev) +{ + const struct property *prop; + const __be32 *val; + int nr; + + prop = of_find_property(dev->of_node, "operating-points", NULL); + if (!prop) + return -ENODEV; + if (!prop->value) + return -ENODATA; + + /* + * Each OPP is a set of tuples consisting of frequency and + * voltage like . + */ + nr = prop->length / sizeof(u32); + if (nr % 2) { + dev_err(dev, "%s: Invalid OPP table\n", __func__); + return -EINVAL; + } + + val = prop->value; + while (nr) { + unsigned long freq = be32_to_cpup(val++) * 1000; + unsigned long volt = be32_to_cpup(val++); + + if (_opp_add_v1(dev, freq, volt, false)) + dev_warn(dev, "%s: Failed to add OPP %ld\n", + __func__, freq); + nr -= 2; + } + + return 0; +} + +/** + * dev_pm_opp_of_add_table() - Initialize opp table from device tree + * @dev: device pointer used to lookup OPP table. + * + * Register the initial OPP table with the OPP library for given device. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function indirectly uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + * + * Return: + * 0 On success OR + * Duplicate OPPs (both freq and volt are same) and opp->available + * -EEXIST Freq are same and volt are different OR + * Duplicate OPPs (both freq and volt are same) and !opp->available + * -ENOMEM Memory allocation failure + * -ENODEV when 'operating-points' property is not found or is invalid data + * in device node. + * -ENODATA when empty 'operating-points' property is found + * -EINVAL when invalid entries are found in opp-v2 table + */ +int dev_pm_opp_of_add_table(struct device *dev) +{ + struct device_node *opp_np; + int ret; + + /* + * OPPs have two version of bindings now. The older one is deprecated, + * try for the new binding first. + */ + opp_np = _of_get_opp_desc_node(dev); + if (!opp_np) { + /* + * Try old-deprecated bindings for backward compatibility with + * older dtbs. + */ + return _of_add_opp_table_v1(dev); + } + + ret = _of_add_opp_table_v2(dev, opp_np); + of_node_put(opp_np); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); + +/* CPU device specific helpers */ + +/** + * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be removed + * + * This removes the OPP tables for CPUs present in the @cpumask. + * This should be used only to remove static entries created from DT. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) +{ + _dev_pm_opp_cpumask_remove_table(cpumask, true); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); + +/** + * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be added. + * + * This adds the OPP tables for CPUs present in the @cpumask. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) +{ + struct device *cpu_dev; + int cpu, ret = 0; + + WARN_ON(cpumask_empty(cpumask)); + + for_each_cpu(cpu, cpumask) { + cpu_dev = get_cpu_device(cpu); + if (!cpu_dev) { + pr_err("%s: failed to get cpu%d device\n", __func__, + cpu); + continue; + } + + ret = dev_pm_opp_of_add_table(cpu_dev); + if (ret) { + pr_err("%s: couldn't find opp table for cpu:%d, %d\n", + __func__, cpu, ret); + + /* Free all other OPPs */ + dev_pm_opp_of_cpumask_remove_table(cpumask); + break; + } + } + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); + +/* + * Works only for OPP v2 bindings. + * + * Returns -ENOENT if operating-points-v2 bindings aren't supported. + */ +/** + * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with + * @cpu_dev using operating-points-v2 + * bindings. + * + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask to update with information of sharing CPUs + * + * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. + * + * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. + * + * Locking: The internal opp_table and opp structures are RCU protected. + * Hence this function internally uses RCU updater strategy with mutex locks + * to keep the integrity of the internal data structures. Callers should ensure + * that this function is *NOT* called under RCU protection or in contexts where + * mutex cannot be locked. + */ +int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, + struct cpumask *cpumask) +{ + struct device_node *np, *tmp_np; + struct device *tcpu_dev; + int cpu, ret = 0; + + /* Get OPP descriptor node */ + np = _of_get_opp_desc_node(cpu_dev); + if (!np) { + dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev node.\n", __func__); + return -ENOENT; + } + + cpumask_set_cpu(cpu_dev->id, cpumask); + + /* OPPs are shared ? */ + if (!of_property_read_bool(np, "opp-shared")) + goto put_cpu_node; + + for_each_possible_cpu(cpu) { + if (cpu == cpu_dev->id) + continue; + + tcpu_dev = get_cpu_device(cpu); + if (!tcpu_dev) { + dev_err(cpu_dev, "%s: failed to get cpu%d device\n", + __func__, cpu); + ret = -ENODEV; + goto put_cpu_node; + } + + /* Get OPP descriptor node */ + tmp_np = _of_get_opp_desc_node(tcpu_dev); + if (!tmp_np) { + dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n", + __func__); + ret = -ENOENT; + goto put_cpu_node; + } + + /* CPUs are sharing opp node */ + if (np == tmp_np) + cpumask_set_cpu(cpu, cpumask); + + of_node_put(tmp_np); + } + +put_cpu_node: + of_node_put(np); + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h index f67f806fcf3a..20f3be22e060 100644 --- a/drivers/base/power/opp/opp.h +++ b/drivers/base/power/opp/opp.h @@ -28,6 +28,8 @@ struct regulator; /* Lock to allow exclusive modification to the device and opp lists */ extern struct mutex opp_table_lock; +extern struct list_head opp_tables; + /* * Internal data structure organization with the OPP layer library is as * follows: @@ -183,6 +185,18 @@ struct opp_table { struct opp_table *_find_opp_table(struct device *dev); struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table); struct device_node *_of_get_opp_desc_node(struct device *dev); +void _dev_pm_opp_remove_table(struct device *dev, bool remove_all); +struct dev_pm_opp *_allocate_opp(struct device *dev, struct opp_table **opp_table); +int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table); +void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp, bool notify); +int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, bool dynamic); +void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of); + +#ifdef CONFIG_OF +void _of_init_opp_table(struct opp_table *opp_table, struct device *dev); +#else +static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) {} +#endif #ifdef CONFIG_DEBUG_FS void opp_debug_remove_one(struct dev_pm_opp *opp); -- cgit v1.2.1