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Date: Thu, 14 Nov 2019 11:02:48 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Kamil Konieczny <k.konieczny@...sung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Kamil Konieczny <k.konieczny@...tner.samsung.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Kyungmin Park <kyungmin.park@...sung.com>,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
Marek Szyprowski <m.szyprowski@...sung.com>,
MyungJoo Ham <myungjoo.ham@...sung.com>
Subject: Re: [PATCH 5/7] devfreq: move transition statistics to devfreq
profile structure
Hi Kamil,
The devfreq_dev_profile structure have to only contain the each devfreq device
callback function/data which are used in the devfreq core.
The generated information after registered the devfreq device
with devfreq_add_device() should be stored in the 'struct device'.
The devfreq core need to split out the data between user input
data (struct devfreq_dev_profile) and the initialized/generated data
by core (struct devfreq). It is not same with cpufreq. cpufreq
don't require the any structure like 'devfreq_dev_profile'.
So, I can't agree.
Thanks.
Chanwoo Choi
On 11/13/19 6:13 PM, Kamil Konieczny wrote:
> Move transition statistics to devfreq profile structure. This is for
> preparation for moving transition statistics into separate struct.
> It is safe to do as frequency table and maximum state information are
> already present in devfreq profile structure and there are no devfreq
> drivers using more than one instance of devfreq structure per devfreq
> profile one.
>
> It also makes devfreq code more similar to cpufreq one.
>
> Signed-off-by: Kamil Konieczny <k.konieczny@...sung.com>
> ---
> drivers/devfreq/devfreq.c | 115 +++++++++++++++++++-------------------
> include/linux/devfreq.h | 25 ++++-----
> 2 files changed, 70 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 6e5a17f4c92c..70533b787744 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -128,7 +128,7 @@ static int set_freq_table(struct devfreq *devfreq)
>
> profile->max_state = count;
> profile->freq_table = devm_kcalloc(devfreq->dev.parent,
> - profile->max_state,
> + count,
> sizeof(*profile->freq_table),
> GFP_KERNEL);
> if (!profile->freq_table) {
> @@ -157,29 +157,30 @@ static int set_freq_table(struct devfreq *devfreq)
> */
> int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
> {
> - int lev, prev_lev, ret = 0;
> + struct devfreq_dev_profile *profile = devfreq->profile;
> unsigned long long cur_time;
> + int lev, prev_lev, ret = 0;
>
> cur_time = get_jiffies_64();
>
> /* Immediately exit if previous_freq is not initialized yet. */
> if (!devfreq->previous_freq) {
> - spin_lock(&devfreq->stats_lock);
> - devfreq->last_time = cur_time;
> - spin_unlock(&devfreq->stats_lock);
> + spin_lock(&profile->stats_lock);
> + profile->last_time = cur_time;
> + spin_unlock(&profile->stats_lock);
> return 0;
> }
>
> prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq);
>
> - spin_lock(&devfreq->stats_lock);
> + spin_lock(&profile->stats_lock);
> if (prev_lev < 0) {
> ret = prev_lev;
> goto out;
> }
>
> - devfreq->time_in_state[prev_lev] +=
> - cur_time - devfreq->last_time;
> + profile->time_in_state[prev_lev] +=
> + cur_time - profile->last_time;
> lev = devfreq_get_freq_level(devfreq, freq);
> if (lev < 0) {
> ret = lev;
> @@ -187,14 +188,14 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
> }
>
> if (lev != prev_lev) {
> - devfreq->trans_table[(prev_lev *
> - devfreq->profile->max_state) + lev]++;
> - devfreq->total_trans++;
> + profile->trans_table[(prev_lev *
> + profile->max_state) + lev]++;
> + profile->total_trans++;
> }
>
> out:
> - devfreq->last_time = cur_time;
> - spin_unlock(&devfreq->stats_lock);
> + profile->last_time = cur_time;
> + spin_unlock(&profile->stats_lock);
> return ret;
> }
> EXPORT_SYMBOL(devfreq_update_status);
> @@ -474,23 +475,23 @@ EXPORT_SYMBOL(devfreq_monitor_suspend);
> void devfreq_monitor_resume(struct devfreq *devfreq)
> {
> unsigned long freq;
> + struct devfreq_dev_profile *profile = devfreq->profile;
>
> mutex_lock(&devfreq->lock);
> if (!devfreq->stop_polling)
> goto out;
>
> - if (!delayed_work_pending(&devfreq->work) &&
> - devfreq->profile->polling_ms)
> + if (!delayed_work_pending(&devfreq->work) && profile->polling_ms)
> queue_delayed_work(devfreq_wq, &devfreq->work,
> - msecs_to_jiffies(devfreq->profile->polling_ms));
> + msecs_to_jiffies(profile->polling_ms));
>
> - spin_lock(&devfreq->stats_lock);
> - devfreq->last_time = get_jiffies_64();
> - spin_unlock(&devfreq->stats_lock);
> + spin_lock(&profile->stats_lock);
> + profile->last_time = get_jiffies_64();
> + spin_unlock(&profile->stats_lock);
> devfreq->stop_polling = false;
>
> - if (devfreq->profile->get_cur_freq &&
> - !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
> + if (profile->get_cur_freq &&
> + !profile->get_cur_freq(devfreq->dev.parent, &freq))
> devfreq->previous_freq = freq;
>
> out:
> @@ -657,7 +658,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
> devfreq->data = data;
> devfreq->nb.notifier_call = devfreq_notifier_call;
>
> - if (!devfreq->profile->max_state && !devfreq->profile->freq_table) {
> + if (!profile->max_state && !profile->freq_table) {
> mutex_unlock(&devfreq->lock);
> err = set_freq_table(devfreq);
> if (err < 0)
> @@ -693,29 +694,29 @@ struct devfreq *devfreq_add_device(struct device *dev,
> goto err_out;
> }
>
> - devfreq->trans_table = devm_kzalloc(&devfreq->dev,
> - array3_size(sizeof(unsigned int),
> - devfreq->profile->max_state,
> - devfreq->profile->max_state),
> - GFP_KERNEL);
> - if (!devfreq->trans_table) {
> + profile->trans_table = devm_kzalloc(&devfreq->dev,
> + array3_size(sizeof(unsigned int),
> + profile->max_state,
> + profile->max_state),
> + GFP_KERNEL);
> + if (!profile->trans_table) {
> mutex_unlock(&devfreq->lock);
> err = -ENOMEM;
> goto err_devfreq;
> }
>
> - devfreq->time_in_state = devm_kcalloc(&devfreq->dev,
> - devfreq->profile->max_state,
> - sizeof(*devfreq->time_in_state),
> - GFP_KERNEL);
> - if (!devfreq->time_in_state) {
> + profile->time_in_state = devm_kcalloc(&devfreq->dev,
> + profile->max_state,
> + sizeof(*profile->time_in_state),
> + GFP_KERNEL);
> + if (!profile->time_in_state) {
> mutex_unlock(&devfreq->lock);
> err = -ENOMEM;
> goto err_devfreq;
> }
>
> - devfreq->last_time = get_jiffies_64();
> - spin_lock_init(&devfreq->stats_lock);
> + profile->last_time = get_jiffies_64();
> + spin_lock_init(&profile->stats_lock);
>
> srcu_init_notifier_head(&devfreq->transition_notifier_list);
>
> @@ -1402,9 +1403,10 @@ static ssize_t trans_stat_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> struct devfreq *devfreq = to_devfreq(dev);
> + struct devfreq_dev_profile *profile = devfreq->profile;
> ssize_t len;
> int i, j;
> - unsigned int max_state = devfreq->profile->max_state;
> + unsigned int max_state = profile->max_state;
>
> if (!devfreq->stop_polling &&
> devfreq_update_status(devfreq, devfreq->previous_freq))
> @@ -1415,46 +1417,45 @@ static ssize_t trans_stat_show(struct device *dev,
> len = sprintf(buf, " From : To\n");
> len += sprintf(buf + len, " :");
>
> - spin_lock(&devfreq->stats_lock);
> + spin_lock(&profile->stats_lock);
> for (i = 0; i < max_state; i++)
> len += sprintf(buf + len, "%10lu",
> - devfreq->profile->freq_table[i]);
> + profile->freq_table[i]);
>
> len += sprintf(buf + len, " time(ms)\n");
>
> for (i = 0; i < max_state; i++) {
> - if (devfreq->profile->freq_table[i]
> - == devfreq->previous_freq) {
> + if (profile->freq_table[i] == devfreq->previous_freq)
> len += sprintf(buf + len, "*");
> - } else {
> + else
> len += sprintf(buf + len, " ");
> - }
> +
> len += sprintf(buf + len, "%10lu:",
> - devfreq->profile->freq_table[i]);
> + profile->freq_table[i]);
> for (j = 0; j < max_state; j++)
> len += sprintf(buf + len, "%10u",
> - devfreq->trans_table[(i * max_state) + j]);
> + profile->trans_table[(i * max_state) + j]);
> len += sprintf(buf + len, "%10llu\n", (u64)
> - jiffies64_to_msecs(devfreq->time_in_state[i]));
> + jiffies64_to_msecs(profile->time_in_state[i]));
> }
>
> len += sprintf(buf + len, "Total transition : %u\n",
> - devfreq->total_trans);
> - spin_unlock(&devfreq->stats_lock);
> + profile->total_trans);
> + spin_unlock(&profile->stats_lock);
> return len;
> }
> static DEVICE_ATTR_RO(trans_stat);
>
> -static void defvreq_stats_clear_table(struct devfreq *devfreq)
> +static void defvreq_stats_clear_table(struct devfreq_dev_profile *profile)
> {
> - unsigned int count = devfreq->profile->max_state;
> -
> - spin_lock(&devfreq->stats_lock);
> - memset(devfreq->time_in_state, 0, count * sizeof(u64));
> - memset(devfreq->trans_table, 0, count * count * sizeof(int));
> - devfreq->last_time = get_jiffies_64();
> - devfreq->total_trans = 0;
> - spin_unlock(&devfreq->stats_lock);
> + unsigned int count = profile->max_state;
> +
> + spin_lock(&profile->stats_lock);
> + memset(profile->time_in_state, 0, count * sizeof(u64));
> + memset(profile->trans_table, 0, count * count * sizeof(int));
> + profile->last_time = get_jiffies_64();
> + profile->total_trans = 0;
> + spin_unlock(&profile->stats_lock);
> }
>
> static ssize_t trans_reset_store(struct device *dev,
> @@ -1464,7 +1465,7 @@ static ssize_t trans_reset_store(struct device *dev,
> {
> struct devfreq *devfreq = to_devfreq(dev);
>
> - defvreq_stats_clear_table(devfreq);
> + defvreq_stats_clear_table(devfreq->profile);
>
> return count;
> }
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index 2ddf25993f7d..4ceb2a517a9c 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -91,6 +91,12 @@ struct devfreq_dev_status {
> * @freq_table: Optional list of frequencies to support statistics
> * and freq_table must be generated in ascending order.
> * @max_state: The size of freq_table.
> + * @total_trans: Number of devfreq transitions
> + * @trans_table: Statistics of devfreq transitions
> + * @time_in_state: Statistics of devfreq states
> + * @last_time: The last time stats were updated
> + * @stats_lock: Lock protecting trans_table, time_in_state,
> + * last_time and total_trans used for statistics
> */
> struct devfreq_dev_profile {
> unsigned long initial_freq;
> @@ -104,6 +110,12 @@ struct devfreq_dev_profile {
>
> unsigned long *freq_table;
> unsigned int max_state;
> + /* information for device frequency transition */
> + unsigned int total_trans;
> + unsigned int *trans_table;
> + u64 *time_in_state;
> + unsigned long long last_time;
> + spinlock_t stats_lock;
> };
>
> /**
> @@ -131,12 +143,6 @@ struct devfreq_dev_profile {
> * @suspend_freq: frequency of a device set during suspend phase.
> * @resume_freq: frequency of a device set in resume phase.
> * @suspend_count: suspend requests counter for a device.
> - * @total_trans: Number of devfreq transitions
> - * @trans_table: Statistics of devfreq transitions
> - * @time_in_state: Statistics of devfreq states
> - * @last_time: The last time stats were updated
> - * @stats_lock: Lock protecting trans_table, time_in_state, last_time
> - * and total_trans used for statistics
> * @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
> *
> * This structure stores the devfreq information for a give device.
> @@ -173,13 +179,6 @@ struct devfreq {
> unsigned long resume_freq;
> atomic_t suspend_count;
>
> - /* information for device frequency transition */
> - unsigned int total_trans;
> - unsigned int *trans_table;
> - u64 *time_in_state;
> - unsigned long long last_time;
> - spinlock_t stats_lock;
> -
> struct srcu_notifier_head transition_notifier_list;
> };
>
>
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