From: Lukasz Luba <lukasz.luba@arm.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: rui.zhang@intel.com, kai.heng.feng@canonical.com,
srinivas.pandruvada@linux.intel.com,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
Amit Kucheria <amitk@kernel.org>
Subject: Re: [PATCH 2/5] thermal/core: Add critical and hot ops
Date: Thu, 10 Dec 2020 13:51:58 +0000 [thread overview]
Message-ID: <8e36355a-3327-fe61-705c-3d50d3865b7f@arm.com> (raw)
In-Reply-To: <565c354e-0850-47f3-ad58-ee28fdedcfb2@linaro.org>
On 12/10/20 1:37 PM, Daniel Lezcano wrote:
> On 10/12/2020 13:44, Lukasz Luba wrote:
>>
>>
>> On 12/10/20 12:15 PM, Daniel Lezcano wrote:
>>> Currently there is no way to the sensors to directly call an ops in
>>> interrupt mode without calling thermal_zone_device_update assuming all
>>> the trip points are defined.
>>>
>>> A sensor may want to do something special if a trip point is hot or
>>> critical.
>>>
>>> This patch adds the critical and hot ops to the thermal zone device,
>>> so a sensor can directly invoke them or let the thermal framework to
>>> call the sensor specific ones.
>>>
>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>>> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
>>> ---
>>> drivers/thermal/thermal_core.c | 43 +++++++++++++++++++++-------------
>>> include/linux/thermal.h | 3 +++
>>> 2 files changed, 30 insertions(+), 16 deletions(-)
>>>
>>> diff --git a/drivers/thermal/thermal_core.c
>>> b/drivers/thermal/thermal_core.c
>>> index e6771e5aeedb..cee0b31b5cd7 100644
>>> --- a/drivers/thermal/thermal_core.c
>>> +++ b/drivers/thermal/thermal_core.c
>>> @@ -375,6 +375,25 @@ static void thermal_emergency_poweroff(void)
>>> msecs_to_jiffies(poweroff_delay_ms));
>>> }
>>> +void thermal_zone_device_critical(struct thermal_zone_device *tz)
>>> +{
>>> + dev_emerg(&tz->device, "%s: critical temperature reached, "
>>> + "shutting down\n", tz->type);
>>> +
>>> + mutex_lock(&poweroff_lock);
>>> + if (!power_off_triggered) {
>>> + /*
>>> + * Queue a backup emergency shutdown in the event of
>>> + * orderly_poweroff failure
>>> + */
>>> + thermal_emergency_poweroff();
>>> + orderly_poweroff(true);
>>> + power_off_triggered = true;
>>> + }
>>> + mutex_unlock(&poweroff_lock);
>>> +}
>>> +EXPORT_SYMBOL(thermal_zone_device_critical);
>>> +
>>> static void handle_critical_trips(struct thermal_zone_device *tz,
>>> int trip, enum thermal_trip_type trip_type)
>>> {
>>> @@ -391,22 +410,10 @@ static void handle_critical_trips(struct
>>> thermal_zone_device *tz,
>>> if (tz->ops->notify)
>>> tz->ops->notify(tz, trip, trip_type);
>>> - if (trip_type == THERMAL_TRIP_CRITICAL) {
>>> - dev_emerg(&tz->device,
>>> - "critical temperature reached (%d C), shutting down\n",
>>> - tz->temperature / 1000);
>>> - mutex_lock(&poweroff_lock);
>>> - if (!power_off_triggered) {
>>> - /*
>>> - * Queue a backup emergency shutdown in the event of
>>> - * orderly_poweroff failure
>>> - */
>>> - thermal_emergency_poweroff();
>>> - orderly_poweroff(true);
>>> - power_off_triggered = true;
>>> - }
>>> - mutex_unlock(&poweroff_lock);
>>> - }
>>> + if (trip_type == THERMAL_TRIP_HOT && tz->ops->hot)
>>> + tz->ops->hot(tz);
>>> + else if (trip_type == THERMAL_TRIP_CRITICAL)
>>> + tz->ops->critical(tz);
>>
>> I can see that in the patch 3/5 there driver .critical() callback
>> calls framework thermal_zone_device_critical() at the end.
>> I wonder if we could always call this framework function.
>
> It is actually done on purpose, we want to let the driver to handle the
> critical routine which may not end up with an emergency shutdown.
I see.
>
> [ ... ]
>
>>> #else
>>> static inline struct thermal_zone_device *thermal_zone_device_register(
>>> const char *type, int trips, int mask, void *devdata,
>>>
>>
>> I am just concerned about drivers which provide own .critical() callback
>> but forgot to call thermal_zone_device_critical() at the end and
>> framework could skip it.
>>
>> Or we can make sure during the review that it's not an issue (and ignore
>> out of tree drivers)?
>
> Yes, the framework guarantees if the critical trip point is crossed we
> call the emergency shutdown by default. If the driver choose to override
> it, it takes responsibility of the change.
>
Fair enough. Thus, the patch LGTM
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Regards,
Lukasz
next prev parent reply other threads:[~2020-12-10 13:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-10 12:15 [PATCH 1/5] thermal/core: Emit a warning if the thermal zone is updated without ops Daniel Lezcano
2020-12-10 12:15 ` [PATCH 2/5] thermal/core: Add critical and hot ops Daniel Lezcano
2020-12-10 12:44 ` Lukasz Luba
2020-12-10 13:37 ` Daniel Lezcano
2020-12-10 13:51 ` Lukasz Luba [this message]
2020-12-10 12:15 ` [PATCH 3/5] thermal/drivers/acpi: Use hot and critical ops Daniel Lezcano
2020-12-17 6:28 ` Daniel Lezcano
2020-12-17 11:38 ` Srinivas Pandruvada
2020-12-17 13:10 ` Daniel Lezcano
2020-12-10 12:15 ` [PATCH 4/5] thermal/drivers/rcar: Remove notification usage Daniel Lezcano
2020-12-10 16:10 ` Niklas Söderlund
2020-12-10 12:15 ` [PATCH 5/5] thermal/core: Remove notify ops Daniel Lezcano
2020-12-10 14:37 ` Lukasz Luba
2020-12-14 14:40 ` [thermal: thermal/next] thermal/core: Emit a warning if the thermal zone is updated without ops thermal-bot for Daniel Lezcano
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