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author | 2016-04-27 08:52:23 +0530 | |
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committer | 2016-04-28 15:18:18 +0200 | |
commit | 6f707daa3833761110a03478cba5cc4b708ec77d (patch) | |
tree | c01c90b01dd8a481283586b2738ac79a95322b27 | |
parent | PM / OPP: Mark cpumask as const in dev_pm_opp_set_sharing_cpus() (diff) | |
download | linux-6f707daa3833761110a03478cba5cc4b708ec77d.tar.gz linux-6f707daa3833761110a03478cba5cc4b708ec77d.tar.bz2 linux-6f707daa3833761110a03478cba5cc4b708ec77d.zip |
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 <viresh.kumar@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r-- | drivers/base/power/opp/cpu.c | 45 | ||||
-rw-r--r-- | include/linux/pm_opp.h | 6 |
2 files changed, 51 insertions, 0 deletions
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); diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 0c08ed3836b1..15f554443b59 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -66,6 +66,7 @@ int dev_pm_opp_set_regulator(struct device *dev, const char *name); void dev_pm_opp_put_regulator(struct device *dev); int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq); int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const cpumask_var_t cpumask); +int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask); #else static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) { @@ -184,6 +185,11 @@ static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const cpum return -ENOTSUPP; } +static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +{ + return -EINVAL; +} + #endif /* CONFIG_PM_OPP */ #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF) |