OpenCloudOS-Kernel/drivers/devfreq/governor_passive.c

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// SPDX-License-Identifier: GPL-2.0-only
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
/*
* linux/drivers/devfreq/governor_passive.c
*
* Copyright (C) 2016 Samsung Electronics
* Author: Chanwoo Choi <cw00.choi@samsung.com>
* Author: MyungJoo Ham <myungjoo.ham@samsung.com>
*/
#include <linux/module.h>
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/slab.h>
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
#include <linux/device.h>
#include <linux/devfreq.h>
#include "governor.h"
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
#define HZ_PER_KHZ 1000
static struct devfreq_cpu_data *
get_parent_cpu_data(struct devfreq_passive_data *p_data,
struct cpufreq_policy *policy)
{
struct devfreq_cpu_data *parent_cpu_data;
if (!p_data || !policy)
return NULL;
list_for_each_entry(parent_cpu_data, &p_data->cpu_data_list, node)
if (parent_cpu_data->first_cpu == cpumask_first(policy->related_cpus))
return parent_cpu_data;
return NULL;
}
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
static unsigned long get_target_freq_by_required_opp(struct device *p_dev,
struct opp_table *p_opp_table,
struct opp_table *opp_table,
unsigned long *freq)
{
struct dev_pm_opp *opp = NULL, *p_opp = NULL;
unsigned long target_freq;
if (!p_dev || !p_opp_table || !opp_table || !freq)
return 0;
p_opp = devfreq_recommended_opp(p_dev, freq, 0);
if (IS_ERR(p_opp))
return 0;
opp = dev_pm_opp_xlate_required_opp(p_opp_table, opp_table, p_opp);
dev_pm_opp_put(p_opp);
if (IS_ERR(opp))
return 0;
target_freq = dev_pm_opp_get_freq(opp);
dev_pm_opp_put(opp);
return target_freq;
}
static int get_target_freq_with_cpufreq(struct devfreq *devfreq,
unsigned long *target_freq)
{
struct devfreq_passive_data *p_data =
(struct devfreq_passive_data *)devfreq->data;
struct devfreq_cpu_data *parent_cpu_data;
struct cpufreq_policy *policy;
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
unsigned long cpu, cpu_cur, cpu_min, cpu_max, cpu_percent;
unsigned long dev_min, dev_max;
unsigned long freq = 0;
int ret = 0;
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
for_each_online_cpu(cpu) {
policy = cpufreq_cpu_get(cpu);
if (!policy) {
ret = -EINVAL;
continue;
}
parent_cpu_data = get_parent_cpu_data(p_data, policy);
if (!parent_cpu_data) {
cpufreq_cpu_put(policy);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
continue;
}
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
/* Get target freq via required opps */
cpu_cur = parent_cpu_data->cur_freq * HZ_PER_KHZ;
freq = get_target_freq_by_required_opp(parent_cpu_data->dev,
parent_cpu_data->opp_table,
devfreq->opp_table, &cpu_cur);
if (freq) {
*target_freq = max(freq, *target_freq);
cpufreq_cpu_put(policy);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
continue;
}
/* Use interpolation if required opps is not available */
devfreq_get_freq_range(devfreq, &dev_min, &dev_max);
cpu_min = parent_cpu_data->min_freq;
cpu_max = parent_cpu_data->max_freq;
cpu_cur = parent_cpu_data->cur_freq;
cpu_percent = ((cpu_cur - cpu_min) * 100) / (cpu_max - cpu_min);
freq = dev_min + mult_frac(dev_max - dev_min, cpu_percent, 100);
*target_freq = max(freq, *target_freq);
cpufreq_cpu_put(policy);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
}
return ret;
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
}
static int get_target_freq_with_devfreq(struct devfreq *devfreq,
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
unsigned long *freq)
{
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct devfreq *parent_devfreq = (struct devfreq *)p_data->parent;
unsigned long child_freq = ULONG_MAX;
int i, count;
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
/* Get target freq via required opps */
child_freq = get_target_freq_by_required_opp(parent_devfreq->dev.parent,
parent_devfreq->opp_table,
devfreq->opp_table, freq);
if (child_freq)
goto out;
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
/* Use interpolation if required opps is not available */
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
for (i = 0; i < parent_devfreq->profile->max_state; i++)
if (parent_devfreq->profile->freq_table[i] == *freq)
break;
if (i == parent_devfreq->profile->max_state)
return -EINVAL;
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
if (i < devfreq->profile->max_state) {
child_freq = devfreq->profile->freq_table[i];
} else {
count = devfreq->profile->max_state;
child_freq = devfreq->profile->freq_table[count - 1];
}
out:
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
*freq = child_freq;
return 0;
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
}
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
unsigned long *freq)
{
struct devfreq_passive_data *p_data =
(struct devfreq_passive_data *)devfreq->data;
int ret;
if (!p_data)
return -EINVAL;
/*
* If the devfreq device with passive governor has the specific method
* to determine the next frequency, should use the get_target_freq()
* of struct devfreq_passive_data.
*/
if (p_data->get_target_freq)
return p_data->get_target_freq(devfreq, freq);
switch (p_data->parent_type) {
case DEVFREQ_PARENT_DEV:
ret = get_target_freq_with_devfreq(devfreq, freq);
break;
case CPUFREQ_PARENT_DEV:
ret = get_target_freq_with_cpufreq(devfreq, freq);
break;
default:
ret = -EINVAL;
dev_err(&devfreq->dev, "Invalid parent type\n");
break;
}
return ret;
}
static int cpufreq_passive_notifier_call(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct devfreq_passive_data *p_data =
container_of(nb, struct devfreq_passive_data, nb);
struct devfreq *devfreq = (struct devfreq *)p_data->this;
struct devfreq_cpu_data *parent_cpu_data;
struct cpufreq_freqs *freqs = ptr;
unsigned int cur_freq;
int ret;
if (event != CPUFREQ_POSTCHANGE || !freqs)
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
return 0;
parent_cpu_data = get_parent_cpu_data(p_data, freqs->policy);
if (!parent_cpu_data || parent_cpu_data->cur_freq == freqs->new)
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
return 0;
cur_freq = parent_cpu_data->cur_freq;
parent_cpu_data->cur_freq = freqs->new;
mutex_lock(&devfreq->lock);
ret = devfreq_update_target(devfreq, freqs->new);
mutex_unlock(&devfreq->lock);
if (ret) {
parent_cpu_data->cur_freq = cur_freq;
dev_err(&devfreq->dev, "failed to update the frequency.\n");
return ret;
}
return 0;
}
static int cpufreq_passive_unregister_notifier(struct devfreq *devfreq)
{
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct devfreq_cpu_data *parent_cpu_data;
int cpu, ret = 0;
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
if (p_data->nb.notifier_call) {
ret = cpufreq_unregister_notifier(&p_data->nb,
CPUFREQ_TRANSITION_NOTIFIER);
if (ret < 0)
return ret;
}
for_each_possible_cpu(cpu) {
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
if (!policy) {
ret = -EINVAL;
continue;
}
parent_cpu_data = get_parent_cpu_data(p_data, policy);
if (!parent_cpu_data) {
cpufreq_cpu_put(policy);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
continue;
}
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
list_del(&parent_cpu_data->node);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
if (parent_cpu_data->opp_table)
dev_pm_opp_put_opp_table(parent_cpu_data->opp_table);
kfree(parent_cpu_data);
cpufreq_cpu_put(policy);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
}
return ret;
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
}
static int cpufreq_passive_register_notifier(struct devfreq *devfreq)
{
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct device *dev = devfreq->dev.parent;
struct opp_table *opp_table = NULL;
struct devfreq_cpu_data *parent_cpu_data;
struct cpufreq_policy *policy;
struct device *cpu_dev;
unsigned int cpu;
int ret;
p_data->cpu_data_list
= (struct list_head)LIST_HEAD_INIT(p_data->cpu_data_list);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
p_data->nb.notifier_call = cpufreq_passive_notifier_call;
ret = cpufreq_register_notifier(&p_data->nb, CPUFREQ_TRANSITION_NOTIFIER);
if (ret) {
dev_err(dev, "failed to register cpufreq notifier\n");
p_data->nb.notifier_call = NULL;
goto err;
}
for_each_possible_cpu(cpu) {
policy = cpufreq_cpu_get(cpu);
if (!policy) {
ret = -EPROBE_DEFER;
goto err;
}
parent_cpu_data = get_parent_cpu_data(p_data, policy);
if (parent_cpu_data) {
cpufreq_cpu_put(policy);
continue;
}
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
parent_cpu_data = kzalloc(sizeof(*parent_cpu_data),
GFP_KERNEL);
if (!parent_cpu_data) {
ret = -ENOMEM;
goto err_put_policy;
}
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev) {
dev_err(dev, "failed to get cpu device\n");
ret = -ENODEV;
goto err_free_cpu_data;
}
opp_table = dev_pm_opp_get_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "failed to get opp_table of cpu%d\n", cpu);
ret = PTR_ERR(opp_table);
goto err_free_cpu_data;
}
parent_cpu_data->dev = cpu_dev;
parent_cpu_data->opp_table = opp_table;
parent_cpu_data->first_cpu = cpumask_first(policy->related_cpus);
parent_cpu_data->cur_freq = policy->cur;
parent_cpu_data->min_freq = policy->cpuinfo.min_freq;
parent_cpu_data->max_freq = policy->cpuinfo.max_freq;
list_add_tail(&parent_cpu_data->node, &p_data->cpu_data_list);
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
cpufreq_cpu_put(policy);
}
mutex_lock(&devfreq->lock);
ret = devfreq_update_target(devfreq, 0L);
mutex_unlock(&devfreq->lock);
if (ret)
dev_err(dev, "failed to update the frequency\n");
return ret;
err_free_cpu_data:
kfree(parent_cpu_data);
err_put_policy:
cpufreq_cpu_put(policy);
err:
WARN_ON(cpufreq_passive_unregister_notifier(devfreq));
return ret;
}
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
static int devfreq_passive_notifier_call(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct devfreq_passive_data *data
= container_of(nb, struct devfreq_passive_data, nb);
struct devfreq *devfreq = (struct devfreq *)data->this;
struct devfreq *parent = (struct devfreq *)data->parent;
struct devfreq_freqs *freqs = (struct devfreq_freqs *)ptr;
unsigned long freq = freqs->new;
int ret = 0;
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
mutex_lock_nested(&devfreq->lock, SINGLE_DEPTH_NESTING);
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
switch (event) {
case DEVFREQ_PRECHANGE:
if (parent->previous_freq > freq)
ret = devfreq_update_target(devfreq, freq);
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
break;
case DEVFREQ_POSTCHANGE:
if (parent->previous_freq < freq)
ret = devfreq_update_target(devfreq, freq);
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
break;
}
mutex_unlock(&devfreq->lock);
if (ret < 0)
dev_warn(&devfreq->dev,
"failed to update devfreq using passive governor\n");
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
return NOTIFY_DONE;
}
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
static int devfreq_passive_unregister_notifier(struct devfreq *devfreq)
{
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct devfreq *parent = (struct devfreq *)p_data->parent;
struct notifier_block *nb = &p_data->nb;
return devfreq_unregister_notifier(parent, nb, DEVFREQ_TRANSITION_NOTIFIER);
}
static int devfreq_passive_register_notifier(struct devfreq *devfreq)
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
{
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct devfreq *parent = (struct devfreq *)p_data->parent;
struct notifier_block *nb = &p_data->nb;
if (!parent)
return -EPROBE_DEFER;
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
nb->notifier_call = devfreq_passive_notifier_call;
return devfreq_register_notifier(parent, nb, DEVFREQ_TRANSITION_NOTIFIER);
}
static int devfreq_passive_event_handler(struct devfreq *devfreq,
unsigned int event, void *data)
{
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
int ret = 0;
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
if (!p_data)
return -EINVAL;
if (!p_data->this)
p_data->this = devfreq;
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
switch (event) {
case DEVFREQ_GOV_START:
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
if (p_data->parent_type == DEVFREQ_PARENT_DEV)
ret = devfreq_passive_register_notifier(devfreq);
else if (p_data->parent_type == CPUFREQ_PARENT_DEV)
ret = cpufreq_passive_register_notifier(devfreq);
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
break;
case DEVFREQ_GOV_STOP:
PM / devfreq: Add cpu based scaling support to passive governor Many CPU architectures have caches that can scale independent of the CPUs. Frequency scaling of the caches is necessary to make sure that the cache is not a performance bottleneck that leads to poor performance and power. The same idea applies for RAM/DDR. To achieve this, this patch adds support for cpu based scaling to the passive governor. This is accomplished by taking the current frequency of each CPU frequency domain and then adjust the frequency of the cache (or any devfreq device) based on the frequency of the CPUs. It listens to CPU frequency transition notifiers to keep itself up to date on the current CPU frequency. To decide the frequency of the device, the governor does one of the following: * Derives the optimal devfreq device opp from required-opps property of the parent cpu opp_table. * Scales the device frequency in proportion to the CPU frequency. So, if the CPUs are running at their max frequency, the device runs at its max frequency. If the CPUs are running at their min frequency, the device runs at its min frequency. It is interpolated for frequencies in between. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> [Sibi: Integrated cpu-freqmap governor into passive_governor] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> [Chanwoo: Fix conflict with latest code and cleanup code] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2021-03-02 14:58:21 +08:00
if (p_data->parent_type == DEVFREQ_PARENT_DEV)
WARN_ON(devfreq_passive_unregister_notifier(devfreq));
else if (p_data->parent_type == CPUFREQ_PARENT_DEV)
WARN_ON(cpufreq_passive_unregister_notifier(devfreq));
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
break;
default:
break;
}
return ret;
}
static struct devfreq_governor devfreq_passive = {
.name = DEVFREQ_GOV_PASSIVE,
.flags = DEVFREQ_GOV_FLAG_IMMUTABLE,
PM / devfreq: Add new passive governor This patch adds the new passive governor for DEVFREQ framework. The following governors are already present and used for DVFS (Dynamic Voltage and Frequency Scaling) drivers. The following governors are independently used for one device driver which don't give the influence to other device drviers and also don't receive the effect from other device drivers. - ondemand / performance / powersave / userspace The passive governor depends on operation of parent driver with specific governos extremely and is not able to decide the new frequency by oneself. According to the decided new frequency of parent driver with governor, the passive governor uses it to decide the appropriate frequency for own device driver. The passive governor must need the following information from device tree: - the source clock and OPP tables - the instance of parent device For exameple, there are one more devfreq device drivers which need to change their source clock according to their utilization on runtime. But, they share the same power line (e.g., regulator). So, specific device driver is operated as parent with ondemand governor and then the rest device driver with passive governor is influenced by parent device. Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [tjakobi: Reported RCU locking issue and cw00.choi fix it] Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> [linux.amoon: Reported possible recursive locking and cw00.choi fix it] Reported-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
2016-03-22 12:44:03 +08:00
.get_target_freq = devfreq_passive_get_target_freq,
.event_handler = devfreq_passive_event_handler,
};
static int __init devfreq_passive_init(void)
{
return devfreq_add_governor(&devfreq_passive);
}
subsys_initcall(devfreq_passive_init);
static void __exit devfreq_passive_exit(void)
{
int ret;
ret = devfreq_remove_governor(&devfreq_passive);
if (ret)
pr_err("%s: failed remove governor %d\n", __func__, ret);
}
module_exit(devfreq_passive_exit);
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("DEVFREQ Passive governor");
MODULE_LICENSE("GPL v2");