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path: root/drivers/cpuidle/governor.c
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Diffstat (limited to 'drivers/cpuidle/governor.c')
-rw-r--r--drivers/cpuidle/governor.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/cpuidle/governor.c b/drivers/cpuidle/governor.c
index 5d359aff3cc5..9fed1b829292 100644
--- a/drivers/cpuidle/governor.c
+++ b/drivers/cpuidle/governor.c
@@ -8,8 +8,10 @@
* This code is licenced under the GPL.
*/
-#include <linux/mutex.h>
+#include <linux/cpu.h>
#include <linux/cpuidle.h>
+#include <linux/mutex.h>
+#include <linux/pm_qos.h>
#include "cpuidle.h"
@@ -93,3 +95,16 @@ int cpuidle_register_governor(struct cpuidle_governor *gov)
return ret;
}
+
+/**
+ * cpuidle_governor_latency_req - Compute a latency constraint for CPU
+ * @cpu: Target CPU
+ */
+int cpuidle_governor_latency_req(unsigned int cpu)
+{
+ int global_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
+ struct device *device = get_cpu_device(cpu);
+ int device_req = dev_pm_qos_raw_read_value(device);
+
+ return device_req < global_req ? device_req : global_req;
+}