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cpuidle: governors: Consolidate PM QoS handling

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There is some code duplication related to the PM QoS handling between
the existing cpuidle governors, so move that code to a common helper
function and call that from the governors.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2018-05-30 13:43:01 +02:00
parent cf7eeea947
commit 0fc784fb09
4 changed files with 19 additions and 17 deletions
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17
drivers/cpuidle/governor.c
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@@ -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;
}