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Date:   Mon, 6 Jul 2020 15:46:12 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>, rui.zhang@...el.com
Cc:     srinivas.pandruvada@...ux.intel.com, rkumbako@...eaurora.org,
        amit.kucheria@...aro.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v4 4/4] thermal: core: Add notifications call in the
 framework

On 06/07/2020 15:17, Marek Szyprowski wrote:
> Hi Daniel,
> 
> On 06.07.2020 12:55, Daniel Lezcano wrote:
>> The generic netlink protocol is implemented but the different
>> notification functions are not yet connected to the core code.
>>
>> These changes add the notification calls in the different
>> corresponding places.
>>
>> Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> 
> This patch landed in today's linux-next 20200706 as commit 5df786e46560 
> ("thermal: core: Add notifications call in the framework"). Sadly it 
> breaks booting various Samsung Exynos based boards. Here is an example 
> log from Odroid U3 board:
> 
> Unable to handle kernel NULL pointer dereference at virtual address 00000010
> pgd = (ptrval)
> [00000010] *pgd=00000000
> Internal error: Oops: 5 [#1] PREEMPT SMP ARM
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-rc3-00015-g5df786e46560 
> #1146
> Hardware name: Samsung Exynos (Flattened Device Tree)
> PC is at kmem_cache_alloc+0x13c/0x418
> LR is at kmem_cache_alloc+0x48/0x418
> pc : [<c02b5cac>]    lr : [<c02b5bb8>]    psr: 20000053
> ...
> Flags: nzCv  IRQs on  FIQs off  Mode SVC_32  ISA ARM  Segment none
> Control: 10c5387d  Table: 4000404a  DAC: 00000051
> Process swapper/0 (pid: 1, stack limit = 0x(ptrval))
> Stack: (0xee8f1cf8 to 0xee8f2000)
> ...
> [<c02b5cac>] (kmem_cache_alloc) from [<c08cd170>] (__alloc_skb+0x5c/0x170)
> [<c08cd170>] (__alloc_skb) from [<c07ec19c>] 
> (thermal_genl_send_event+0x24/0x174)
> [<c07ec19c>] (thermal_genl_send_event) from [<c07ec648>] 
> (thermal_notify_tz_create+0x58/0x74)
> [<c07ec648>] (thermal_notify_tz_create) from [<c07e9058>] 
> (thermal_zone_device_register+0x358/0x650)
> [<c07e9058>] (thermal_zone_device_register) from [<c1028d34>] 
> (of_parse_thermal_zones+0x304/0x7a4)
> [<c1028d34>] (of_parse_thermal_zones) from [<c1028964>] 
> (thermal_init+0xdc/0x154)
> [<c1028964>] (thermal_init) from [<c0102378>] (do_one_initcall+0x8c/0x424)
> [<c0102378>] (do_one_initcall) from [<c1001158>] 
> (kernel_init_freeable+0x190/0x204)
> [<c1001158>] (kernel_init_freeable) from [<c0ab85f4>] 
> (kernel_init+0x8/0x118)
> [<c0ab85f4>] (kernel_init) from [<c0100114>] (ret_from_fork+0x14/0x20)
> 
> Reverting it on top of linux-next fixes the boot issue. I will 
> investigate it further soon.

Thanks for reporting this.

Can you send the addr2line result and code it points to ?


>> ---
>>    v4:
>>       - Fixed missing static declaration, reported by kbuild-bot
>>       - Removed max state notification
>> ---
>>   drivers/thermal/thermal_core.c    | 21 +++++++++++++++++++++
>>   drivers/thermal/thermal_helpers.c | 13 +++++++++++--
>>   drivers/thermal/thermal_sysfs.c   | 15 ++++++++++++++-
>>   3 files changed, 46 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
>> index 5fae1621fb01..25ef29123f72 100644
>> --- a/drivers/thermal/thermal_core.c
>> +++ b/drivers/thermal/thermal_core.c
>> @@ -215,6 +215,8 @@ int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
>>   	mutex_unlock(&tz->lock);
>>   	mutex_unlock(&thermal_governor_lock);
>>   
>> +	thermal_notify_tz_gov_change(tz->id, policy);
>> +
>>   	return ret;
>>   }
>>   
>> @@ -406,12 +408,25 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
>>   static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
>>   {
>>   	enum thermal_trip_type type;
>> +	int trip_temp, hyst = 0;
>>   
>>   	/* Ignore disabled trip points */
>>   	if (test_bit(trip, &tz->trips_disabled))
>>   		return;
>>   
>> +	tz->ops->get_trip_temp(tz, trip, &trip_temp);
>>   	tz->ops->get_trip_type(tz, trip, &type);
>> +	if (tz->ops->get_trip_hyst)
>> +		tz->ops->get_trip_hyst(tz, trip, &hyst);
>> +
>> +	if (tz->last_temperature != THERMAL_TEMP_INVALID) {
>> +		if (tz->last_temperature < trip_temp &&
>> +		    tz->temperature >= trip_temp)
>> +			thermal_notify_tz_trip_up(tz->id, trip);
>> +		if (tz->last_temperature >= trip_temp &&
>> +		    tz->temperature < (trip_temp - hyst))
>> +			thermal_notify_tz_trip_down(tz->id, trip);
>> +	}
>>   
>>   	if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
>>   		handle_critical_trips(tz, trip, type);
>> @@ -443,6 +458,8 @@ static void update_temperature(struct thermal_zone_device *tz)
>>   	mutex_unlock(&tz->lock);
>>   
>>   	trace_thermal_temperature(tz);
>> +
>> +	thermal_genl_sampling_temp(tz->id, temp);
>>   }
>>   
>>   static void thermal_zone_device_init(struct thermal_zone_device *tz)
>> @@ -1405,6 +1422,8 @@ thermal_zone_device_register(const char *type, int trips, int mask,
>>   	if (atomic_cmpxchg(&tz->need_update, 1, 0))
>>   		thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>>   
>> +	thermal_notify_tz_create(tz->id, tz->type);
>> +
>>   	return tz;
>>   
>>   unregister:
>> @@ -1476,6 +1495,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
>>   	ida_destroy(&tz->ida);
>>   	mutex_destroy(&tz->lock);
>>   	device_unregister(&tz->device);
>> +
>> +	thermal_notify_tz_delete(tz->id);
>>   }
>>   EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
>>   
>> diff --git a/drivers/thermal/thermal_helpers.c b/drivers/thermal/thermal_helpers.c
>> index 87b1256fa2f2..c94bc824e5d3 100644
>> --- a/drivers/thermal/thermal_helpers.c
>> +++ b/drivers/thermal/thermal_helpers.c
>> @@ -175,6 +175,16 @@ void thermal_zone_set_trips(struct thermal_zone_device *tz)
>>   	mutex_unlock(&tz->lock);
>>   }
>>   
>> +static void thermal_cdev_set_cur_state(struct thermal_cooling_device *cdev,
>> +				       int target)
>> +{
>> +	if (cdev->ops->set_cur_state(cdev, target))
>> +		return;
>> +
>> +	thermal_notify_cdev_state_update(cdev->id, target);
>> +	thermal_cooling_device_stats_update(cdev, target);
>> +}
>> +
>>   void thermal_cdev_update(struct thermal_cooling_device *cdev)
>>   {
>>   	struct thermal_instance *instance;
>> @@ -197,8 +207,7 @@ void thermal_cdev_update(struct thermal_cooling_device *cdev)
>>   			target = instance->target;
>>   	}
>>   
>> -	if (!cdev->ops->set_cur_state(cdev, target))
>> -		thermal_cooling_device_stats_update(cdev, target);
>> +	thermal_cdev_set_cur_state(cdev, target);
>>   
>>   	cdev->updated = true;
>>   	mutex_unlock(&cdev->lock);
>> diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
>> index aa99edb4dff7..ff449943f757 100644
>> --- a/drivers/thermal/thermal_sysfs.c
>> +++ b/drivers/thermal/thermal_sysfs.c
>> @@ -124,7 +124,8 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr,
>>   {
>>   	struct thermal_zone_device *tz = to_thermal_zone(dev);
>>   	int trip, ret;
>> -	int temperature;
>> +	int temperature, hyst = 0;
>> +	enum thermal_trip_type type;
>>   
>>   	if (!tz->ops->set_trip_temp)
>>   		return -EPERM;
>> @@ -139,6 +140,18 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr,
>>   	if (ret)
>>   		return ret;
>>   
>> +	if (tz->ops->get_trip_hyst) {
>> +		ret = tz->ops->get_trip_hyst(tz, trip, &hyst);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	ret = tz->ops->get_trip_type(tz, trip, &type);
>> +	if (ret)
>> +		return ret;
>> +
>> +	thermal_notify_tz_trip_change(tz->id, trip, type, temperature, hyst);
>> +
>>   	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>>   
>>   	return count;
> 
> Best regards
> 


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