Subject: Re: linux-next: manual merge of the thermal tree with the pm tree

From: "Wysocki, Rafael J" <[email-masked]>
Date: Thu, 5 Jan 2023 15:27:03 +0100

On 1/5/2023 12:35 AM, Stephen Rothwell wrote:
> Hi all,
>
> On Thu, 5 Jan 2023 10:10:54 +1100 Stephen Rothwell <[email-masked]> wrote:
>> Today's linux-next merge of the thermal tree got a conflict in:
>>
>>    drivers/thermal/intel/x86_pkg_temp_thermal.c
>>
>> between commit:
>>
>>    58374a3970a0 ("thermal/x86_pkg_temp_thermal: Add support for handling dynamic tjmax")
>>
>> from the pm tree and commit:
>>
>>    03b2e86a24aa ("thermal/drivers/intel: Use generic thermal_zone_get_trip() function")
>>
>> from the thermal tree.

I'm wondering why the above commit is in the linux-next branch of the 
thermal tree, though.

It is still under review AFAICS.

Daniel, can you possibly create a bleeding-edge branch for such things?  
I can merge it into my bleeding-edge branch on a daily basis.

>> I fixed it up (see below) and can carry the fix as necessary. This
>> is now fixed as far as linux-next is concerned, but any non trivial
>> conflicts should be mentioned to your upstream maintainer when your tree
>> is submitted for merging.  You may also want to consider cooperating
>> with the maintainer of the conflicting tree to minimise any particularly
>> complex conflicts.
> Actually, the resolution I needed was this:
>
> diff --cc drivers/thermal/intel/x86_pkg_temp_thermal.c
> index 9e08d8c8f5fb,494f25250c2d..24c7774cc4a9
> --- a/drivers/thermal/intel/x86_pkg_temp_thermal.c
> +++ b/drivers/thermal/intel/x86_pkg_temp_thermal.c
> @@@ -107,56 -108,37 +108,17 @@@ static struct zone_device *pkg_temp_the
>    static int sys_get_curr_temp(struct thermal_zone_device *tzd, int *temp)
>    {
>    	struct zone_device *zonedev = tzd->devdata;
>   -	u32 eax, edx;
>   +	int val;
>    
>   -	rdmsr_on_cpu(zonedev->cpu, MSR_IA32_PACKAGE_THERM_STATUS,
>   -			&eax, &edx);
>   -	if (eax & 0x80000000) {
>   -		*temp = zonedev->tj_max - ((eax >> 16) & 0x7f) * 1000;
>   -		pr_debug("sys_get_curr_temp %d\n", *temp);
>   -		return 0;
>   -	}
>   -	return -EINVAL;
>   +	val = intel_tcc_get_temp(zonedev->cpu, true);
>   +	if (val < 0)
>   +		return val;
>   +
>   +	*temp = val * 1000;
>   +	pr_debug("sys_get_curr_temp %d\n", *temp);
>   +	return 0;
>    }
>    
> - static int sys_get_trip_temp(struct thermal_zone_device *tzd,
> - 			     int trip, int *temp)
> - {
> - 	struct zone_device *zonedev = tzd->devdata;
> - 	unsigned long thres_reg_value;
> - 	u32 mask, shift, eax, edx;
> - 	int tj_max, ret;
> -
> - 	if (trip >= MAX_NUMBER_OF_TRIPS)
> - 		return -EINVAL;
> -
> - 	if (trip) {
> - 		mask = THERM_MASK_THRESHOLD1;
> - 		shift = THERM_SHIFT_THRESHOLD1;
> - 	} else {
> - 		mask = THERM_MASK_THRESHOLD0;
> - 		shift = THERM_SHIFT_THRESHOLD0;
> - 	}
> -
> - 	tj_max = intel_tcc_get_tjmax(zonedev->cpu);
> - 	if (tj_max < 0)
> - 		return tj_max;
> - 	tj_max *= 1000;
> -
> - 	ret = rdmsr_on_cpu(zonedev->cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT,
> - 			   &eax, &edx);
> - 	if (ret < 0)
> - 		return ret;
> -
> - 	thres_reg_value = (eax & mask) >> shift;
> - 	if (thres_reg_value)
> - 		*temp = tj_max - thres_reg_value * 1000;
> - 	else
> - 		*temp = THERMAL_TEMP_INVALID;
> - 	pr_debug("sys_get_trip_temp %d\n", *temp);
> -
> - 	return 0;
> - }
> -
>    static int
>    sys_set_trip_temp(struct thermal_zone_device *tzd, int trip, int temp)
>    {
> @@@ -330,18 -340,25 +325,25 @@@ static int pkg_temp_thermal_device_add(
>    
>    	thres_count = clamp_val(thres_count, 0, MAX_NUMBER_OF_TRIPS);
>    
> - 	err = intel_tcc_get_tjmax(cpu);
> - 	if (err < 0)
>   -	err = get_tj_max(cpu, &tj_max);
>   -	if (err)
> --		return err;
> ++	tj_max = intel_tcc_get_tjmax(cpu);
> ++	if (tj_max < 0)
> ++		return tj_max;
> ++	tj_max *= 1000;
>    
>    	zonedev = kzalloc(sizeof(*zonedev), GFP_KERNEL);
>    	if (!zonedev)
>    		return -ENOMEM;
>    
> + 	zonedev->trips = pkg_temp_thermal_trips_init(cpu, tj_max, thres_count);
> + 	if (IS_ERR(zonedev->trips)) {
> + 		err = PTR_ERR(zonedev->trips);
> + 		goto out_kfree_zonedev;
> + 	}
> +
>    	INIT_DELAYED_WORK(&zonedev->work, pkg_temp_thermal_threshold_work_fn);
>    	zonedev->cpu = cpu;
> - 	zonedev->tzone = thermal_zone_device_register("x86_pkg_temp",
> - 			thres_count,
>   -	zonedev->tj_max = tj_max;
> + 	zonedev->tzone = thermal_zone_device_register_with_trips("x86_pkg_temp",
> + 			zonedev->trips, thres_count,
>    			(thres_count == MAX_NUMBER_OF_TRIPS) ? 0x03 : 0x01,
>    			zonedev, &tzone_ops, &pkg_temp_tz_params, 0, 0);
>    	if (IS_ERR(zonedev->tzone)) {
>