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Message-ID: <88ae483d-2239-5af6-7ba1-2c5e7acb4042@linaro.org>
Date: Tue, 28 Apr 2020 17:30:04 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Lukasz Luba <lukasz.luba@....com>, rui.zhang@...el.com
Cc: amit.kucheria@...durent.com,
Viresh Kumar <viresh.kumar@...aro.org>,
Amit Daniel Kachhap <amit.kachhap@...il.com>,
Javi Merino <javi.merino@...nel.org>,
"open list:THERMAL/CPU_COOLING" <linux-pm@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] thermal/drivers/cpuidle_cooling: Change the
registration function
Hi Lukasz,
On 28/04/2020 17:20, Lukasz Luba wrote:
> Hi Daniel,
>
> I have checked the patches and run them on Juno.
> Please find my comments below.
thanks a lot for the review and the testing.
> On 4/14/20 11:08 PM, Daniel Lezcano wrote:
>> Today, there is no user for the cpuidle cooling device. The targetted
>> platform is ARM and ARM64.
>>
>> The cpuidle and the cpufreq cooling device are based on the device tree.
>>
>> As the cpuidle cooling device can have its own configuration depending
>> on the platform and the available idle states. The DT node description
>> will give the optional properties to set the cooling device up.
>>
>> Do no longer rely on the CPU node which is prone to error and will
>> lead to a confusion in the DT because the cpufreq cooling device is
>> also using it. Let initialize the cpuidle cooling device with the DT
>> binding.
>>
>> This was tested on:
>> - hikey960
>> - hikey6220
>> - rock960
>> - db845c
>>
>> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---
>> drivers/thermal/cpuidle_cooling.c | 58 +++++++++++++++++++++++++------
>> include/linux/cpu_cooling.h | 7 ----
>> 2 files changed, 47 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/thermal/cpuidle_cooling.c
>> b/drivers/thermal/cpuidle_cooling.c
>> index 0bb843246f59..b2c81c427f05 100644
>> --- a/drivers/thermal/cpuidle_cooling.c
>> +++ b/drivers/thermal/cpuidle_cooling.c
>> @@ -10,6 +10,7 @@
>> #include <linux/err.h>
>> #include <linux/idle_inject.h>
>> #include <linux/idr.h>
>> +#include <linux/of_device.h>
>> #include <linux/slab.h>
>> #include <linux/thermal.h>
>> @@ -154,22 +155,25 @@ static struct thermal_cooling_device_ops
>> cpuidle_cooling_ops = {
>> };
>> /**
>> - * cpuidle_of_cooling_register - Idle cooling device initialization
>> function
>> + * __cpuidle_cooling_register: register the cooling device
>> * @drv: a cpuidle driver structure pointer
>> - * @np: a node pointer to a device tree cooling device node
>> + * @np: a device node structure pointer used for the thermal binding
>> *
>> - * This function is in charge of creating a cooling device per cpuidle
>> - * driver and register it to thermal framework.
>> + * This function is in charge of allocating the cpuidle cooling device
>> + * structure, the idle injection, initialize them and register the
>> + * cooling device to the thermal framework.
>> *
>> - * Return: zero on success, or negative value corresponding to the
>> - * error detected in the underlying subsystems.
>> + * Return: zero on success, a negative value returned by one of the
>> + * underlying subsystem in case of error
>> */
>> -int cpuidle_of_cooling_register(struct device_node *np,
>> - struct cpuidle_driver *drv)
>> +static int __cpuidle_cooling_register(struct device_node *np,
>> + struct cpuidle_driver *drv)
>> {
>> struct idle_inject_device *ii_dev;
>> struct cpuidle_cooling_device *idle_cdev;
>> struct thermal_cooling_device *cdev;
>> + unsigned int idle_duration_us = TICK_USEC;
>> + unsigned int latency_us = UINT_MAX;
>> char dev_name[THERMAL_NAME_LENGTH];
>> int id, ret;
>> @@ -191,7 +195,11 @@ int cpuidle_of_cooling_register(struct
>> device_node *np,
>> goto out_id;
>> }
>> - idle_inject_set_duration(ii_dev, TICK_USEC, TICK_USEC);
>> + of_property_read_u32(np, "duration", &idle_duration_us);
>
> This probably is 'duration-us' according to DT bindings.
>
>> + of_property_read_u32(np, "latency", &latency_us);
>
> the same here s/latency/exit-latency-us/
>
>> +
>> + idle_inject_set_duration(ii_dev, TICK_USEC, idle_duration_us);
>> + idle_inject_set_latency(ii_dev, latency_us);
>> idle_cdev->ii_dev = ii_dev;
>> @@ -204,6 +212,9 @@ int cpuidle_of_cooling_register(struct
>> device_node *np,
>> goto out_unregister;
>> }
>> + pr_info("%s: Idle injection set with idle duration=%u,
>> latency=%u\n",
>> + dev_name, idle_duration_us, latency_us);
>
> 1. It is more like a 'debug' rather than 'info', I would change it.
> 2. This is going to be printed for every CPU which has the
> 'thermal-idle' feature in DT. For platforms with many CPUs, it's a lot
> of log entries
>
>> +
>> return 0;
>> out_unregister:
>> @@ -221,12 +232,37 @@ int cpuidle_of_cooling_register(struct
>> device_node *np,
>> * @drv: a cpuidle driver structure pointer
>> *
>> * This function is in charge of creating a cooling device per cpuidle
>> - * driver and register it to thermal framework.
>> + * driver and register it to the thermal framework.
>> *
>> * Return: zero on success, or negative value corresponding to the
>> * error detected in the underlying subsystems.
>> */
>> int cpuidle_cooling_register(struct cpuidle_driver *drv)
>> {
>> - return cpuidle_of_cooling_register(NULL, drv);
>> + struct device_node *cooling_node;
>> + struct device_node *cpu_node;
>> + int cpu, ret;
>> +
>> + for_each_cpu(cpu, drv->cpumask) {
>> +
>> + cpu_node = of_cpu_device_node_get(cpu);
>> +
>> + cooling_node = of_get_child_by_name(cpu_node, "idle-thermal");
>
> In DT binding this is 'thermal-idle'.
>
>> +
>> + of_node_put(cpu_node);
>> +
>> + if (!cooling_node)
>> + continue;
>
> This 'continue' is suspicious because it won't tell if there was no
> node "idle-thermal" but still the function will return 0. This was
> my case when I tried to enable it on Juno.
>
> Maybe a debug print that the node hasn't been found would be a
> good idea. Or somehow return different value than 0 taking into
> account that every CPU was skipped.
>
>> +
>> + ret = __cpuidle_cooling_register(cooling_node, drv);
>> +
>> + of_node_put(cooling_node);
>> +
>> + if (ret)
>> + return ret;
>> +
>> + cooling_node = NULL;
>> + }
>> +
>> + return 0;
>> }
>> diff --git a/include/linux/cpu_cooling.h b/include/linux/cpu_cooling.h
>> index 65501d8f9778..4d7b4a303327 100644
>> --- a/include/linux/cpu_cooling.h
>> +++ b/include/linux/cpu_cooling.h
>> @@ -64,18 +64,11 @@ struct cpuidle_driver;
>> #ifdef CONFIG_CPU_IDLE_THERMAL
>> int cpuidle_cooling_register(struct cpuidle_driver *drv);
>> -int cpuidle_of_cooling_register(struct device_node *np,
>> - struct cpuidle_driver *drv);
>> #else /* CONFIG_CPU_IDLE_THERMAL */
>> static inline int cpuidle_cooling_register(struct cpuidle_driver *drv)
>> {
>> return 0;
>> }
>> -static inline int cpuidle_of_cooling_register(struct device_node *np,
>> - struct cpuidle_driver *drv)
>> -{
>> - return 0;
>> -}
>> #endif /* CONFIG_CPU_IDLE_THERMAL */
>> #endif /* __CPU_COOLING_H__ */
>>
>
> Apart from that, looks good to me.
>
> Regards,
> Lukasz
--
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