C++ pm_qos_request函数代码示例

static int update_core_config(unsigned int cpunumber, bool up)
{
	int ret = -EINVAL;
	unsigned int nr_cpus = num_online_cpus();
	int max_cpus = pm_qos_request(PM_QOS_MAX_ONLINE_CPUS) ? : 4;
	int min_cpus = pm_qos_request(PM_QOS_MIN_ONLINE_CPUS);

	if (cpq_state == TEGRA_CPQ_DISABLED || cpunumber >= nr_cpu_ids)
		return ret;

	if (up) {
		if(is_lp_cluster()) {
			cpumask_set_cpu(cpunumber, &cr_online_requests);
			ret = -EBUSY;
		} else {
			if (tegra_cpu_edp_favor_up(nr_cpus, mp_overhead) &&
			    nr_cpus < max_cpus)
				ret = cpu_up(cpunumber);
		}
	} else {
		if (is_lp_cluster()) {
			ret = -EBUSY;
		} else {
			if (nr_cpus > min_cpus)
				ret = cpu_down(cpunumber);
		}
	}

	return ret;
}

static int gk20a_scale_qos_notify(struct notifier_block *nb,
				  unsigned long n, void *p)
{
	struct gk20a_scale_profile *profile =
		container_of(nb, struct gk20a_scale_profile,
			     qos_notify_block);
	struct gk20a_platform *platform = platform_get_drvdata(profile->pdev);
	struct gk20a *g = get_gk20a(profile->pdev);
	unsigned long freq;

	if (!platform->postscale)
		return NOTIFY_OK;

	/* get the frequency requirement. if devfreq is enabled, check if it
	 * has higher demand than qos */
	freq = gk20a_clk_round_rate(g, pm_qos_request(platform->qos_id));
	if (g->devfreq)
		freq = max(g->devfreq->previous_freq, freq);

	/* Update gpu load because we may scale the emc target
	 * if the gpu load changed. */
	gk20a_pmu_load_update(g);
	platform->postscale(profile->pdev, freq);

	return NOTIFY_OK;
}

unsigned int cpufreq_get_touch_boost_press(void)
{

	touch_boost_press_value = pm_qos_request(PM_QOS_TOUCH_PRESS);

	return touch_boost_press_value;
}

/**
 * ladder_select_state - selects the next state to enter
 * @drv: cpuidle driver
 * @dev: the CPU
 */
static int ladder_select_state(struct cpuidle_driver *drv,
				struct cpuidle_device *dev)
{
	struct ladder_device *ldev = this_cpu_ptr(&ladder_devices);
	struct ladder_device_state *last_state;
	int last_residency, last_idx = ldev->last_state_idx;
	int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);

	/* Special case when user has set very strict latency requirement */
	if (unlikely(latency_req == 0)) {
		ladder_do_selection(ldev, last_idx, 0);
		return 0;
	}

	last_state = &ldev->states[last_idx];

	last_residency = cpuidle_get_last_residency(dev) - drv->states[last_idx].exit_latency;

	/* consider promotion */
	if (last_idx < drv->state_count - 1 &&
	    !drv->states[last_idx + 1].disabled &&
	    !dev->states_usage[last_idx + 1].disable &&
	    last_residency > last_state->threshold.promotion_time &&
	    drv->states[last_idx + 1].exit_latency <= latency_req) {
		last_state->stats.promotion_count++;
		last_state->stats.demotion_count = 0;
		if (last_state->stats.promotion_count >= last_state->threshold.promotion_count) {
			ladder_do_selection(ldev, last_idx, last_idx + 1);
			return last_idx + 1;
		}
	}

	/* consider demotion */
	if (last_idx > CPUIDLE_DRIVER_STATE_START &&
	    (drv->states[last_idx].disabled ||
	    dev->states_usage[last_idx].disable ||
	    drv->states[last_idx].exit_latency > latency_req)) {
		int i;

		for (i = last_idx - 1; i > CPUIDLE_DRIVER_STATE_START; i--) {
			if (drv->states[i].exit_latency <= latency_req)
				break;
		}
		ladder_do_selection(ldev, last_idx, i);
		return i;
	}

	if (last_idx > CPUIDLE_DRIVER_STATE_START &&
	    last_residency < last_state->threshold.demotion_time) {
		last_state->stats.demotion_count++;
		last_state->stats.promotion_count = 0;
		if (last_state->stats.demotion_count >= last_state->threshold.demotion_count) {
			ladder_do_selection(ldev, last_idx, last_idx - 1);
			return last_idx - 1;
		}
	}

	/* otherwise remain at the current state */
	return last_idx;
}

static ssize_t show_bus_int_freq_min(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	unsigned int ret = 0;
	ret =  sprintf(buf, "%d\n", pm_qos_request(PM_QOS_DEVICE_THROUGHPUT));
	return ret;
}

static ssize_t show_bimc_freq_min(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	unsigned int ret = 0;
	ret =  sprintf(buf, "%d\n", pm_qos_request(PM_QOS_BIMC_FREQ_MIN));
	return ret;
}

static noinline int tegra_cpu_speed_balance(void)
{
    unsigned long highest_speed = tegra_cpu_highest_speed();
    unsigned long balanced_speed = highest_speed * balance_level / 100;
    unsigned long skewed_speed = balanced_speed / 2;
    unsigned int nr_cpus = num_online_cpus();
    unsigned int max_cpus = pm_qos_request(PM_QOS_MAX_ONLINE_CPUS) ? : 4;
    unsigned int min_cpus = pm_qos_request(PM_QOS_MIN_ONLINE_CPUS);

    /* balanced: freq targets for all CPUs are above 50% of highest speed
       biased: freq target for at least one CPU is below 50% threshold
       skewed: freq targets for at least 2 CPUs are below 25% threshold */
    if (((tegra_count_slow_cpus(skewed_speed) >= 2) ||
            tegra_cpu_edp_favor_down(nr_cpus, mp_overhead) ||
            (highest_speed <= idle_bottom_freq) || (nr_cpus > max_cpus)) &&
            (nr_cpus > min_cpus))
        return TEGRA_CPU_SPEED_SKEWED;

    if (((tegra_count_slow_cpus(balanced_speed) >= 1) ||
            (!tegra_cpu_edp_favor_up(nr_cpus, mp_overhead)) ||
            (highest_speed <= idle_bottom_freq) || (nr_cpus == max_cpus)) &&
            (nr_cpus >= min_cpus))
        return TEGRA_CPU_SPEED_BIASED;

    return TEGRA_CPU_SPEED_BALANCED;
}

static void update_runnables_state(void)
{
	unsigned int nr_cpus = num_online_cpus();
	int max_cpus = pm_qos_request(PM_QOS_MAX_ONLINE_CPUS) ? : 4;
	int min_cpus = pm_qos_request(PM_QOS_MIN_ONLINE_CPUS);
	unsigned int avg_nr_run = avg_nr_running();
	unsigned int nr_run;

	if (runnables_state == DISABLED)
		return;

	for (nr_run = 1; nr_run < ARRAY_SIZE(nr_run_thresholds); nr_run++) {
		unsigned int nr_threshold = nr_run_thresholds[nr_run - 1];
		if (nr_run_last <= nr_run)
			nr_threshold += NR_FSHIFT / nr_run_hysteresis;
		if (avg_nr_run <= (nr_threshold << (FSHIFT - NR_FSHIFT_EXP)))
			break;
	}
	nr_run_last = nr_run;

	if ((nr_cpus > max_cpus || nr_run < nr_cpus) && nr_cpus >= min_cpus) {
		runnables_state = DOWN;
	} else if (nr_cpus < min_cpus || nr_run > nr_cpus) {
		runnables_state =  UP;
	} else {
		runnables_state = IDLE;
	}
}

static ssize_t show_cpu_online_min(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	unsigned int ret = 0;
	ret =  sprintf(buf, "%d\n", pm_qos_request(PM_QOS_CPU_ONLINE_MIN));
	return ret;
}

static int devfreq_simple_ondemand_func(struct devfreq *df,
					unsigned long *freq)
{
	struct devfreq_dev_status stat;
	int err;
	unsigned long long a, b;
	unsigned int dfso_upthreshold = DFSO_UPTHRESHOLD;
	unsigned int dfso_downdifferential = DFSO_DOWNDIFFERENCTIAL;
	unsigned int dfso_multiplication_weight = DFSO_WEIGHT;
	struct devfreq_simple_ondemand_data *data = df->data;
	unsigned long max = (df->max_freq) ? df->max_freq : UINT_MAX;
	unsigned long pm_qos_min = 0;

	if (data) {
		pm_qos_min = pm_qos_request(data->pm_qos_class);
		if (pm_qos_min >= data->cal_qos_max) {
			*freq = pm_qos_min;
			return 0;
		}
	}

	if (df->profile->get_dev_status) {
		err = df->profile->get_dev_status(df->dev.parent, &stat);
	} else {
		*freq = pm_qos_min;
		return 0;
	}

	if (err)
		return err;

	if (data) {
		if (data->upthreshold)
			dfso_upthreshold = data->upthreshold;
		if (data->downdifferential)
			dfso_downdifferential = data->downdifferential;
		if (data->multiplication_weight)
			dfso_multiplication_weight = data->multiplication_weight;
	}
	if (dfso_upthreshold > 100 ||
	    dfso_upthreshold < dfso_downdifferential)
		return -EINVAL;

	if (data && data->cal_qos_max)
		max = (df->max_freq) ? df->max_freq : 0;

	/* Assume MAX if it is going to be divided by zero */
	if (stat.total_time == 0) {
		if (data && data->cal_qos_max)
			max = max3(max, data->cal_qos_max, pm_qos_min);
		*freq = max;
		return 0;
	}

	/* Prevent overflow */
	if (stat.busy_time >= (1 << 24) || stat.total_time >= (1 << 24)) {
		stat.busy_time >>= 7;
		stat.total_time >>= 7;
	}

int __cpuinit cpu_up(unsigned int cpu)
{
	int err = 0;

#ifdef	CONFIG_MEMORY_HOTPLUG
	int nid;
	pg_data_t	*pgdat;
#endif

	if (num_online_cpus() >= pm_qos_request(PM_QOS_CPU_ONLINE_MAX))
		return 0;

	if (!cpu_possible(cpu)) {
		printk(KERN_ERR "can't online cpu %d because it is not "
			"configured as may-hotadd at boot time\n", cpu);
#if defined(CONFIG_IA64)
		printk(KERN_ERR "please check additional_cpus= boot "
				"parameter\n");
#endif
		return -EINVAL;
	}

#ifdef	CONFIG_MEMORY_HOTPLUG
	nid = cpu_to_node(cpu);
	if (!node_online(nid)) {
		err = mem_online_node(nid);
		if (err)
			return err;
	}

	pgdat = NODE_DATA(nid);
	if (!pgdat) {
		printk(KERN_ERR
			"Can't online cpu %d due to NULL pgdat\n", cpu);
		return -ENOMEM;
	}

	if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
		mutex_lock(&zonelists_mutex);
		build_all_zonelists(NULL);
		mutex_unlock(&zonelists_mutex);
	}
#endif

	cpu_maps_update_begin();

	if (cpu_hotplug_disabled) {
		err = -EBUSY;
		goto out;
	}

	err = _cpu_up(cpu, 0);

out:
	cpu_maps_update_done();
	return err;
}

static ssize_t show_cpufreq_max(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	unsigned int ret = 0;
	max_cpu_freq = pm_qos_request(PM_QOS_CPU_FREQ_MAX);
	ret +=  snprintf(buf + ret, PAGE_SIZE - ret, "%d\n", max_cpu_freq);

	return ret;
}

static ssize_t store_cpu_online_max(struct kobject *a, struct attribute *b,
				  const char *buf, size_t count)
{
	set_pmqos_data(cpu_online_max_qos_array, PM_QOS_CPU_ONLINE_MAX, buf);
	if (num_online_cpus() > pm_qos_request(PM_QOS_CPU_ONLINE_MAX))
		cpu_down(1);

	return count;
}

static ssize_t store_cpu_online_min(struct kobject *a, struct attribute *b,
				  const char *buf, size_t count)
{
	set_pmqos_data(cpu_online_min_qos_array, PM_QOS_CPU_ONLINE_MIN, buf);

	if (num_online_cpus() < pm_qos_request(PM_QOS_CPU_ONLINE_MIN)) {
		pr_info("%s cpu_up\n", __FUNCTION__);
		cpu_up(1);
	}
	return count;
}

/*
 * find_couple_state - Find the maximum state platform can enter
 *
 * @index: pointer to variable which stores the maximum state
 * @cluster: cluster number
 *
 * Must be called with function holds mmp_lpm_lock
 */
static void find_coupled_state(int *index, int cluster)
{
    int i;
    int platform_lpm = DEFAULT_LPM_FLAG;

    for (i = 0; i < MAX_CPUS_PER_CLUSTER; i++)
        platform_lpm &= mmp_enter_lpm[cluster][i];

    *index = min(find_first_zero_bit((void *)&platform_lpm, LPM_NUM),
                 pm_qos_request(PM_QOS_CPUIDLE_BLOCK)) - 1;

}