Commit fc3ac632 authored by Xiangwei Li's avatar Xiangwei Li Committed by Ma Wupeng
Browse files

PM / devfreq: Add bandwidth verification mechanism 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IBC4SJ



--------------------------------

Trigger the highest frequency bandwidth regularly, judge the bandwidth
change ratio and the corresponding frequency ratio, and abstract the
judgment logic through accuracy loss. If the conditions are not met, the
conditions are reset.

Signed-off-by: default avatarXiangwei Li <liwei728@huawei.com>
parent a4b9559d

drivers/devfreq/event/hisi-uncore-l3c.c

+28 −2
Original line number Diff line number Diff line
@@ -16,12 +16,18 @@ 


#include "hisi-uncore.h"



HISI_UNCORE_EVENT_TYPE_ATTR;

HISI_UNCORE_EVENT_CONFIG_ATTR;

#define CORRECT_PERIOD		11



static HISI_UNCORE_EVENT_TYPE_ATTR;

static HISI_UNCORE_EVENT_CONFIG_ATTR;



static int l3c_get_events(struct devfreq_event_dev *edev, struct devfreq_event_data *edata)

{

	u64 load;

	int p0, p1, p2;

	static u64 last_load;

	static int period = 0;



	struct hisi_uncore_event_info *info = devfreq_event_get_drvdata(edev);



	load = get_pmu_monitor_status(info);
@@ -29,9 +35,29 @@ static int l3c_get_events(struct devfreq_event_dev *edev, struct devfreq_event_d 
	if (info->is_reset) {

		info->is_reset = false;

		info->max_load = 0;

		period = 0;

		return 0;

	}



	period++;

	if (period == CORRECT_PERIOD - 1) {

		edata->load_count = info->max_load;

		edata->total_count = info->max_load;

		last_load = load;

		return 0;

	}



	if (period == CORRECT_PERIOD) {

		period = 0;

		p0 = last_load * 100 / load;

		p1 = last_load * 100 / info->max_load;

		p2 = load * 100 / info->max_load;



		if (p2 > p1 && p1 > 0 && p2 * 105 / p1 < 100 * 100 / p0) {

			info->max_load = load;

		}

	}



	info->max_load = max(info->max_load, load);

	edata->load_count = load;

	edata->total_count = info->max_load;

drivers/devfreq/hisi_uncore_freq.c

+8 −2
Original line number Diff line number Diff line
@@ -255,10 +255,16 @@ static int hisi_uncore_get_dev_status(struct device *dev, 
		if (rc)

			return rc;



		if (ratio <= edata.load_count * 1000 / edata.total_count) {

		if (edata.load_count == edata.total_count) {

			stat->busy_time = edata.load_count;

			stat->total_time = edata.total_count;

			ratio = edata.load_count * 1000 / edata.total_count;

			return 0;

		}



		if (ratio <= edata.load_count * 100 / edata.total_count) {

			stat->busy_time = edata.load_count;

			stat->total_time = edata.total_count;

			ratio = edata.load_count * 100 / edata.total_count;

		}

	}