From: Michael Turquette <mturque...@baylibre.com>
Some architectures and platforms perform CPU frequency transitions
through a non-blocking method, while some might block or sleep. This
distinction is important when trying to change frequency from interrupt
context or in any other non-interruptable context, such as from the
Linux scheduler.
Describe this distinction with a cpufreq driver flag,
CPUFREQ_DRIVER_WILL_NOT_SLEEP. The default is to not have this flag set,
thus erring on the side of caution.
cpufreq_driver_might_sleep() is also introduced in this patch. Setting
the above flag will allow this function to return false.
Cc: Rafael J. Wysocki <raf...@kernel.org>
Cc: Viresh Kumar <viresh.ku...@linaro.org>
Signed-off-by: Michael Turquette <mturque...@baylibre.com>
---
drivers/cpufreq/cpufreq.c | 6 ++++++
include/linux/cpufreq.h | 9 +++++++++
2 files changed, 15 insertions(+)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 8ae655c..5753cb6 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -112,6 +112,12 @@ bool have_governor_per_policy(void)
}
EXPORT_SYMBOL_GPL(have_governor_per_policy);
+bool cpufreq_driver_might_sleep(void)
+{
+ return !(cpufreq_driver->flags & CPUFREQ_DRIVER_WILL_NOT_SLEEP);
+}
+EXPORT_SYMBOL_GPL(cpufreq_driver_might_sleep);
+
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy)
{
if (have_governor_per_policy())
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 2ee4888..1f2c9a1 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -157,6 +157,7 @@ u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int
io_busy);
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
int cpufreq_update_policy(unsigned int cpu);
bool have_governor_per_policy(void);
+bool cpufreq_driver_might_sleep(void);
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
#else
static inline unsigned int cpufreq_get(unsigned int cpu)
@@ -314,6 +315,14 @@ struct cpufreq_driver {
*/
#define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
+/*
+ * Set by drivers that will never block or sleep during their frequency
+ * transition. Used to indicate when it is safe to call cpufreq_driver_target
+ * from non-interruptable context. Drivers must opt-in to this flag, as the
+ * safe default is that they might sleep.
+ */
+#define CPUFREQ_DRIVER_WILL_NOT_SLEEP (1 << 6)
+
int cpufreq_register_driver(struct cpufreq_driver *driver_data);
int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
