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Date: Fri, 31 May 2019 22:13:55 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Quentin Perret <quentin.perret@....com>, edubezval@...il.com,
rui.zhang@...el.com, javi.merino@...nel.org,
viresh.kumar@...aro.org, amit.kachhap@...il.com, rjw@...ysocki.net,
will.deacon@....com, catalin.marinas@....com,
dietmar.eggemann@....com, ionela.voinescu@....com,
mka@...omium.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 2/3] thermal: cpu_cooling: Make the power-related code
depend on IPA
On 30/05/2019 11:20, Quentin Perret wrote:
> The core CPU cooling infrastructure has power-related functions
> that have only one client: IPA. Since there can be no user of those
> functions if IPA is not compiled in, make sure to guard them with
> checks on CONFIG_THERMAL_GOV_POWER_ALLOCATOR to not waste space
> unnecessarily.
>
> Suggested-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> Signed-off-by: Quentin Perret <quentin.perret@....com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Thanks!
-- Daniel
> ---
> drivers/thermal/cpu_cooling.c | 214 +++++++++++++++++-----------------
> 1 file changed, 104 insertions(+), 110 deletions(-)
>
> diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
> index 4c5db59a619b..498f59ab64b2 100644
> --- a/drivers/thermal/cpu_cooling.c
> +++ b/drivers/thermal/cpu_cooling.c
> @@ -46,7 +46,9 @@
> */
> struct freq_table {
> u32 frequency;
> +#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
> u32 power;
> +#endif
> };
>
> /**
> @@ -96,28 +98,6 @@ static DEFINE_IDA(cpufreq_ida);
> static DEFINE_MUTEX(cooling_list_lock);
> static LIST_HEAD(cpufreq_cdev_list);
>
> -/* Below code defines functions to be used for cpufreq as cooling device */
> -
> -/**
> - * get_level: Find the level for a particular frequency
> - * @cpufreq_cdev: cpufreq_cdev for which the property is required
> - * @freq: Frequency
> - *
> - * Return: level corresponding to the frequency.
> - */
> -static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev,
> - unsigned int freq)
> -{
> - struct freq_table *freq_table = cpufreq_cdev->freq_table;
> - unsigned long level;
> -
> - for (level = 1; level <= cpufreq_cdev->max_level; level++)
> - if (freq > freq_table[level].frequency)
> - break;
> -
> - return level - 1;
> -}
> -
> /**
> * cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
> * @nb: struct notifier_block * with callback info.
> @@ -171,6 +151,27 @@ static int cpufreq_thermal_notifier(struct notifier_block *nb,
> return NOTIFY_OK;
> }
>
> +#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
> +/**
> + * get_level: Find the level for a particular frequency
> + * @cpufreq_cdev: cpufreq_cdev for which the property is required
> + * @freq: Frequency
> + *
> + * Return: level corresponding to the frequency.
> + */
> +static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev,
> + unsigned int freq)
> +{
> + struct freq_table *freq_table = cpufreq_cdev->freq_table;
> + unsigned long level;
> +
> + for (level = 1; level <= cpufreq_cdev->max_level; level++)
> + if (freq > freq_table[level].frequency)
> + break;
> +
> + return level - 1;
> +}
> +
> /**
> * update_freq_table() - Update the freq table with power numbers
> * @cpufreq_cdev: the cpufreq cooling device in which to update the table
> @@ -319,80 +320,6 @@ static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev,
> return (raw_cpu_power * cpufreq_cdev->last_load) / 100;
> }
>
> -/* cpufreq cooling device callback functions are defined below */
> -
> -/**
> - * cpufreq_get_max_state - callback function to get the max cooling state.
> - * @cdev: thermal cooling device pointer.
> - * @state: fill this variable with the max cooling state.
> - *
> - * Callback for the thermal cooling device to return the cpufreq
> - * max cooling state.
> - *
> - * Return: 0 on success, an error code otherwise.
> - */
> -static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
> - unsigned long *state)
> -{
> - struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
> -
> - *state = cpufreq_cdev->max_level;
> - return 0;
> -}
> -
> -/**
> - * cpufreq_get_cur_state - callback function to get the current cooling state.
> - * @cdev: thermal cooling device pointer.
> - * @state: fill this variable with the current cooling state.
> - *
> - * Callback for the thermal cooling device to return the cpufreq
> - * current cooling state.
> - *
> - * Return: 0 on success, an error code otherwise.
> - */
> -static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
> - unsigned long *state)
> -{
> - struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
> -
> - *state = cpufreq_cdev->cpufreq_state;
> -
> - return 0;
> -}
> -
> -/**
> - * cpufreq_set_cur_state - callback function to set the current cooling state.
> - * @cdev: thermal cooling device pointer.
> - * @state: set this variable to the current cooling state.
> - *
> - * Callback for the thermal cooling device to change the cpufreq
> - * current cooling state.
> - *
> - * Return: 0 on success, an error code otherwise.
> - */
> -static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
> - unsigned long state)
> -{
> - struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
> - unsigned int clip_freq;
> -
> - /* Request state should be less than max_level */
> - if (WARN_ON(state > cpufreq_cdev->max_level))
> - return -EINVAL;
> -
> - /* Check if the old cooling action is same as new cooling action */
> - if (cpufreq_cdev->cpufreq_state == state)
> - return 0;
> -
> - clip_freq = cpufreq_cdev->freq_table[state].frequency;
> - cpufreq_cdev->cpufreq_state = state;
> - cpufreq_cdev->clipped_freq = clip_freq;
> -
> - cpufreq_update_policy(cpufreq_cdev->policy->cpu);
> -
> - return 0;
> -}
> -
> /**
> * cpufreq_get_requested_power() - get the current power
> * @cdev: &thermal_cooling_device pointer
> @@ -536,22 +463,88 @@ static int cpufreq_power2state(struct thermal_cooling_device *cdev,
> power);
> return 0;
> }
> +#endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */
> +
> +/* cpufreq cooling device callback functions are defined below */
> +
> +/**
> + * cpufreq_get_max_state - callback function to get the max cooling state.
> + * @cdev: thermal cooling device pointer.
> + * @state: fill this variable with the max cooling state.
> + *
> + * Callback for the thermal cooling device to return the cpufreq
> + * max cooling state.
> + *
> + * Return: 0 on success, an error code otherwise.
> + */
> +static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
> + unsigned long *state)
> +{
> + struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
> +
> + *state = cpufreq_cdev->max_level;
> + return 0;
> +}
> +
> +/**
> + * cpufreq_get_cur_state - callback function to get the current cooling state.
> + * @cdev: thermal cooling device pointer.
> + * @state: fill this variable with the current cooling state.
> + *
> + * Callback for the thermal cooling device to return the cpufreq
> + * current cooling state.
> + *
> + * Return: 0 on success, an error code otherwise.
> + */
> +static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
> + unsigned long *state)
> +{
> + struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
> +
> + *state = cpufreq_cdev->cpufreq_state;
> +
> + return 0;
> +}
> +
> +/**
> + * cpufreq_set_cur_state - callback function to set the current cooling state.
> + * @cdev: thermal cooling device pointer.
> + * @state: set this variable to the current cooling state.
> + *
> + * Callback for the thermal cooling device to change the cpufreq
> + * current cooling state.
> + *
> + * Return: 0 on success, an error code otherwise.
> + */
> +static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
> + unsigned long state)
> +{
> + struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
> + unsigned int clip_freq;
> +
> + /* Request state should be less than max_level */
> + if (WARN_ON(state > cpufreq_cdev->max_level))
> + return -EINVAL;
> +
> + /* Check if the old cooling action is same as new cooling action */
> + if (cpufreq_cdev->cpufreq_state == state)
> + return 0;
> +
> + clip_freq = cpufreq_cdev->freq_table[state].frequency;
> + cpufreq_cdev->cpufreq_state = state;
> + cpufreq_cdev->clipped_freq = clip_freq;
> +
> + cpufreq_update_policy(cpufreq_cdev->policy->cpu);
> +
> + return 0;
> +}
>
> /* Bind cpufreq callbacks to thermal cooling device ops */
>
> static struct thermal_cooling_device_ops cpufreq_cooling_ops = {
> - .get_max_state = cpufreq_get_max_state,
> - .get_cur_state = cpufreq_get_cur_state,
> - .set_cur_state = cpufreq_set_cur_state,
> -};
> -
> -static struct thermal_cooling_device_ops cpufreq_power_cooling_ops = {
> .get_max_state = cpufreq_get_max_state,
> .get_cur_state = cpufreq_get_cur_state,
> .set_cur_state = cpufreq_set_cur_state,
> - .get_requested_power = cpufreq_get_requested_power,
> - .state2power = cpufreq_state2power,
> - .power2state = cpufreq_power2state,
> };
>
> /* Notifier for cpufreq policy change */
> @@ -659,18 +652,19 @@ __cpufreq_cooling_register(struct device_node *np,
> pr_debug("%s: freq:%u KHz\n", __func__, freq);
> }
>
> + cooling_ops = &cpufreq_cooling_ops;
> +#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
> if (capacitance) {
> ret = update_freq_table(cpufreq_cdev, capacitance);
> if (ret) {
> cdev = ERR_PTR(ret);
> goto remove_ida;
> }
> -
> - cooling_ops = &cpufreq_power_cooling_ops;
> - } else {
> - cooling_ops = &cpufreq_cooling_ops;
> + cooling_ops->get_requested_power = cpufreq_get_requested_power;
> + cooling_ops->state2power = cpufreq_state2power;
> + cooling_ops->power2state = cpufreq_power2state;
> }
> -
> +#endif
> cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev,
> cooling_ops);
> if (IS_ERR(cdev))
>
--
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