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* Re: [PATCH v4 04/11] thermal: Store device mode in struct thermal_zone_device
@ 2020-06-02 15:00 Guenter Roeck
  0 siblings, 0 replies; 143+ messages in thread
From: Guenter Roeck @ 2020-06-02 15:00 UTC (permalink / raw)
  To: Andrzej Pietrasiewicz
  Cc: linux-pm, linux-acpi, netdev, linux-wireless,
	platform-driver-x86, linux-arm-kernel, linux-renesas-soc,
	linux-rockchip, Emmanuel Grumbach, Heiko Stuebner,
	Rafael J . Wysocki, Vishal Kulkarni, Luca Coelho, Miquel Raynal,
	kernel, Fabio Estevam, Amit Kucheria, Chunyan Zhang,
	Daniel Lezcano, Allison Randal, NXP Linux Team, Darren Hart,
	Zhang Rui, Gayatri Kammela, Len Brown, Johannes Berg,
	Intel Linux Wireless, Sascha Hauer, Ido Schimmel, Baolin Wang,
	Jiri Pirko, Orson Zhai, Thomas Gleixner, Kalle Valo,
	Support Opensource, Enrico Weigelt, Peter Kaestle,
	Sebastian Reichel, Bartlomiej Zolnierkiewicz,
	Pengutronix Kernel Team, Niklas Söderlund, Shawn Guo,
	David S . Miller, Andy Shevchenko

On Thu, May 28, 2020 at 09:20:44PM +0200, Andrzej Pietrasiewicz wrote:
> Prepare for eliminating get_mode().
> 
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/acpi/thermal.c                        | 18 ++++++----------
>  .../ethernet/mellanox/mlxsw/core_thermal.c    | 21 +++++++------------
>  drivers/platform/x86/acerhdf.c                | 15 ++++++-------
>  drivers/thermal/da9062-thermal.c              |  6 ++----
>  drivers/thermal/imx_thermal.c                 | 17 +++++++--------
>  .../intel/int340x_thermal/int3400_thermal.c   | 12 +++--------
>  .../thermal/intel/intel_quark_dts_thermal.c   | 16 +++++++-------
>  drivers/thermal/thermal_of.c                  | 10 +++------
>  8 files changed, 44 insertions(+), 71 deletions(-)
> 
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index fb46070c66d8..4ba273f49d87 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -172,7 +172,6 @@ struct acpi_thermal {
>  	struct acpi_thermal_trips trips;
>  	struct acpi_handle_list devices;
>  	struct thermal_zone_device *thermal_zone;
> -	enum thermal_device_mode mode;
>  	int kelvin_offset;	/* in millidegrees */
>  	struct work_struct thermal_check_work;
>  };
> @@ -500,7 +499,7 @@ static void acpi_thermal_check(void *data)
>  {
>  	struct acpi_thermal *tz = data;
>  
> -	if (tz->mode != THERMAL_DEVICE_ENABLED)
> +	if (tz->thermal_zone->mode != THERMAL_DEVICE_ENABLED)
>  		return;
>  
>  	thermal_zone_device_update(tz->thermal_zone,
> @@ -529,12 +528,7 @@ static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
>  static int thermal_get_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode *mode)
>  {
> -	struct acpi_thermal *tz = thermal->devdata;
> -
> -	if (!tz)
> -		return -EINVAL;
> -
> -	*mode = tz->mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -556,11 +550,11 @@ static int thermal_set_mode(struct thermal_zone_device *thermal,
>  	if (mode == THERMAL_DEVICE_DISABLED)
>  		pr_warn("thermal zone will be disabled\n");
>  
> -	if (mode != tz->mode) {
> -		tz->mode = mode;
> +	if (mode != tz->thermal_zone->mode) {
> +		tz->thermal_zone->mode = mode;
>  		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
>  			"%s kernel ACPI thermal control\n",
> -			tz->mode == THERMAL_DEVICE_ENABLED ?
> +			tz->thermal_zone->mode == THERMAL_DEVICE_ENABLED ?
>  			"Enable" : "Disable"));
>  		acpi_thermal_check(tz);
>  	}
> @@ -912,7 +906,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
>  		goto remove_dev_link;
>  	}
>  
> -	tz->mode = THERMAL_DEVICE_ENABLED;
> +	tz->thermal_zone->mode = THERMAL_DEVICE_ENABLED;
>  
>  	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
>  		 tz->thermal_zone->id);
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> index ce0a6837daa3..aa082e8a0b13 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> @@ -98,7 +98,6 @@ struct mlxsw_thermal_module {
>  	struct mlxsw_thermal *parent;
>  	struct thermal_zone_device *tzdev;
>  	struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
> -	enum thermal_device_mode mode;
>  	int module; /* Module or gearbox number */
>  };
>  
> @@ -110,7 +109,6 @@ struct mlxsw_thermal {
>  	struct thermal_cooling_device *cdevs[MLXSW_MFCR_PWMS_MAX];
>  	u8 cooling_levels[MLXSW_THERMAL_MAX_STATE + 1];
>  	struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
> -	enum thermal_device_mode mode;
>  	struct mlxsw_thermal_module *tz_module_arr;
>  	u8 tz_module_num;
>  	struct mlxsw_thermal_module *tz_gearbox_arr;
> @@ -280,9 +278,7 @@ static int mlxsw_thermal_unbind(struct thermal_zone_device *tzdev,
>  static int mlxsw_thermal_get_mode(struct thermal_zone_device *tzdev,
>  				  enum thermal_device_mode *mode)
>  {
> -	struct mlxsw_thermal *thermal = tzdev->devdata;
> -
> -	*mode = thermal->mode;
> +	*mode = tzdev->mode;
>  
>  	return 0;
>  }
> @@ -299,9 +295,9 @@ static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
>  	else
>  		tzdev->polling_delay = 0;
>  
> +	tzdev->mode = mode;
>  	mutex_unlock(&tzdev->lock);
>  
> -	thermal->mode = mode;
>  	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -469,9 +465,7 @@ static int mlxsw_thermal_module_unbind(struct thermal_zone_device *tzdev,
>  static int mlxsw_thermal_module_mode_get(struct thermal_zone_device *tzdev,
>  					 enum thermal_device_mode *mode)
>  {
> -	struct mlxsw_thermal_module *tz = tzdev->devdata;
> -
> -	*mode = tz->mode;
> +	*mode = tzdev->mode;
>  
>  	return 0;
>  }
> @@ -489,9 +483,10 @@ static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
>  	else
>  		tzdev->polling_delay = 0;
>  
> +	tzdev->mode = mode;
> +
>  	mutex_unlock(&tzdev->lock);
>  
> -	tz->mode = mode;
>  	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -765,7 +760,7 @@ mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
>  		return err;
>  	}
>  
> -	module_tz->mode = THERMAL_DEVICE_ENABLED;
> +	module_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	return 0;
>  }
>  
> @@ -881,7 +876,7 @@ mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
>  	if (IS_ERR(gearbox_tz->tzdev))
>  		return PTR_ERR(gearbox_tz->tzdev);
>  
> -	gearbox_tz->mode = THERMAL_DEVICE_ENABLED;
> +	gearbox_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	return 0;
>  }
>  
> @@ -1050,7 +1045,7 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
>  	if (err)
>  		goto err_unreg_modules_tzdev;
>  
> -	thermal->mode = THERMAL_DEVICE_ENABLED;
> +	thermal->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	*p_thermal = thermal;
>  	return 0;
>  
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 830a8b060e74..97b288485837 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -68,7 +68,6 @@ static int kernelmode = 1;
>  #else
>  static int kernelmode;
>  #endif
> -static enum thermal_device_mode thermal_mode;
>  
>  static unsigned int interval = 10;
>  static unsigned int fanon = 60000;
> @@ -398,15 +397,16 @@ static inline void acerhdf_revert_to_bios_mode(void)
>  {
>  	acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
>  	kernelmode = 0;
> -	thermal_mode = THERMAL_DEVICE_DISABLED;
> -	if (thz_dev)
> +	if (thz_dev) {
> +		thz_dev->mode = THERMAL_DEVICE_DISABLED;
>  		thz_dev->polling_delay = 0;
> +	}
>  	pr_notice("kernel mode fan control OFF\n");
>  }
>  static inline void acerhdf_enable_kernelmode(void)
>  {
>  	kernelmode = 1;
> -	thermal_mode = THERMAL_DEVICE_ENABLED;
> +	thz_dev->mode = THERMAL_DEVICE_ENABLED;
>  
>  	thz_dev->polling_delay = interval*1000;
>  	thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
> @@ -419,7 +419,7 @@ static int acerhdf_get_mode(struct thermal_zone_device *thermal,
>  	if (verbose)
>  		pr_notice("kernel mode fan control %d\n", kernelmode);
>  
> -	*mode = thermal_mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -741,8 +741,6 @@ static int __init acerhdf_register_thermal(void)
>  	if (IS_ERR(cl_dev))
>  		return -EINVAL;
>  
> -	thermal_mode = kernelmode ?
> -		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
>  	thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
>  					      &acerhdf_dev_ops,
>  					      &acerhdf_zone_params, 0,
> @@ -750,6 +748,9 @@ static int __init acerhdf_register_thermal(void)
>  	if (IS_ERR(thz_dev))
>  		return -EINVAL;
>  
> +	thz_dev->mode = kernelmode ?
> +		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
> +
>  	if (strcmp(thz_dev->governor->name,
>  				acerhdf_zone_params.governor_name)) {
>  		pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
> diff --git a/drivers/thermal/da9062-thermal.c b/drivers/thermal/da9062-thermal.c
> index c32709badeda..a14c7981c7c7 100644
> --- a/drivers/thermal/da9062-thermal.c
> +++ b/drivers/thermal/da9062-thermal.c
> @@ -49,7 +49,6 @@ struct da9062_thermal {
>  	struct da9062 *hw;
>  	struct delayed_work work;
>  	struct thermal_zone_device *zone;
> -	enum thermal_device_mode mode;
>  	struct mutex lock; /* protection for da9062_thermal temperature */
>  	int temperature;
>  	int irq;
> @@ -124,8 +123,7 @@ static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
>  static int da9062_thermal_get_mode(struct thermal_zone_device *z,
>  				   enum thermal_device_mode *mode)
>  {
> -	struct da9062_thermal *thermal = z->devdata;
> -	*mode = thermal->mode;
> +	*mode = z->mode;
>  	return 0;
>  }
>  
> @@ -233,7 +231,6 @@ static int da9062_thermal_probe(struct platform_device *pdev)
>  
>  	thermal->config = match->data;
>  	thermal->hw = chip;
> -	thermal->mode = THERMAL_DEVICE_ENABLED;
>  	thermal->dev = &pdev->dev;
>  
>  	INIT_DELAYED_WORK(&thermal->work, da9062_thermal_poll_on);
> @@ -248,6 +245,7 @@ static int da9062_thermal_probe(struct platform_device *pdev)
>  		ret = PTR_ERR(thermal->zone);
>  		goto err;
>  	}
> +	thermal->zone->mode = THERMAL_DEVICE_ENABLED;
>  
>  	dev_dbg(&pdev->dev,
>  		"TJUNC temperature polling period set at %d ms\n",
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index e761c9b42217..9a1114d721b6 100644
> --- a/drivers/thermal/imx_thermal.c
> +++ b/drivers/thermal/imx_thermal.c
> @@ -197,7 +197,6 @@ struct imx_thermal_data {
>  	struct cpufreq_policy *policy;
>  	struct thermal_zone_device *tz;
>  	struct thermal_cooling_device *cdev;
> -	enum thermal_device_mode mode;
>  	struct regmap *tempmon;
>  	u32 c1, c2; /* See formula in imx_init_calib() */
>  	int temp_passive;
> @@ -256,7 +255,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  	bool wait;
>  	u32 val;
>  
> -	if (data->mode == THERMAL_DEVICE_ENABLED) {
> +	if (tz->mode == THERMAL_DEVICE_ENABLED) {
>  		/* Check if a measurement is currently in progress */
>  		regmap_read(map, soc_data->temp_data, &val);
>  		wait = !(val & soc_data->temp_valid_mask);
> @@ -283,7 +282,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  
>  	regmap_read(map, soc_data->temp_data, &val);
>  
> -	if (data->mode != THERMAL_DEVICE_ENABLED) {
> +	if (tz->mode != THERMAL_DEVICE_ENABLED) {
>  		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
>  			     soc_data->measure_temp_mask);
>  		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
> @@ -334,9 +333,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  static int imx_get_mode(struct thermal_zone_device *tz,
>  			enum thermal_device_mode *mode)
>  {
> -	struct imx_thermal_data *data = tz->devdata;
> -
> -	*mode = data->mode;
> +	*mode = tz->mode;
>  
>  	return 0;
>  }
> @@ -376,7 +373,7 @@ static int imx_set_mode(struct thermal_zone_device *tz,
>  		}
>  	}
>  
> -	data->mode = mode;
> +	tz->mode = mode;
>  	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -831,7 +828,7 @@ static int imx_thermal_probe(struct platform_device *pdev)
>  		     data->socdata->measure_temp_mask);
>  
>  	data->irq_enabled = true;
> -	data->mode = THERMAL_DEVICE_ENABLED;
> +	data->tz->mode = THERMAL_DEVICE_ENABLED;
>  
>  	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
>  			imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
> @@ -885,7 +882,7 @@ static int __maybe_unused imx_thermal_suspend(struct device *dev)
>  		     data->socdata->measure_temp_mask);
>  	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
>  		     data->socdata->power_down_mask);
> -	data->mode = THERMAL_DEVICE_DISABLED;
> +	data->tz->mode = THERMAL_DEVICE_DISABLED;
>  	clk_disable_unprepare(data->thermal_clk);
>  
>  	return 0;
> @@ -905,7 +902,7 @@ static int __maybe_unused imx_thermal_resume(struct device *dev)
>  		     data->socdata->power_down_mask);
>  	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
>  		     data->socdata->measure_temp_mask);
> -	data->mode = THERMAL_DEVICE_ENABLED;
> +	data->tz->mode = THERMAL_DEVICE_ENABLED;
>  
>  	return 0;
>  }
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index e84faaadff87..f65b2fc09198 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -48,7 +48,6 @@ struct int3400_thermal_priv {
>  	struct acpi_device *adev;
>  	struct platform_device *pdev;
>  	struct thermal_zone_device *thermal;
> -	enum thermal_device_mode mode;
>  	int art_count;
>  	struct art *arts;
>  	int trt_count;
> @@ -381,12 +380,7 @@ static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
>  static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode *mode)
>  {
> -	struct int3400_thermal_priv *priv = thermal->devdata;
> -
> -	if (!priv)
> -		return -EINVAL;
> -
> -	*mode = priv->mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -404,8 +398,8 @@ static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
>  	    mode != THERMAL_DEVICE_DISABLED)
>  		return -EINVAL;
>  
> -	if (mode != priv->mode) {
> -		priv->mode = mode;
> +	if (mode != thermal->mode) {
> +		thermal->mode = mode;
>  		result = int3400_thermal_run_osc(priv->adev->handle,
>  						priv->current_uuid_index,
>  						mode == THERMAL_DEVICE_ENABLED);
> diff --git a/drivers/thermal/intel/intel_quark_dts_thermal.c b/drivers/thermal/intel/intel_quark_dts_thermal.c
> index d704fc104cfd..d77cb3df5ade 100644
> --- a/drivers/thermal/intel/intel_quark_dts_thermal.c
> +++ b/drivers/thermal/intel/intel_quark_dts_thermal.c
> @@ -103,7 +103,6 @@ struct soc_sensor_entry {
>  	bool locked;
>  	u32 store_ptps;
>  	u32 store_dts_enable;
> -	enum thermal_device_mode mode;
>  	struct thermal_zone_device *tzone;
>  };
>  
> @@ -128,7 +127,7 @@ static int soc_dts_enable(struct thermal_zone_device *tzd)
>  		return ret;
>  
>  	if (out & QRK_DTS_ENABLE_BIT) {
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  		return 0;
>  	}
>  
> @@ -139,9 +138,9 @@ static int soc_dts_enable(struct thermal_zone_device *tzd)
>  		if (ret)
>  			return ret;
>  
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  	} else {
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  		pr_info("DTS is locked. Cannot enable DTS\n");
>  		ret = -EPERM;
>  	}
> @@ -161,7 +160,7 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
>  		return ret;
>  
>  	if (!(out & QRK_DTS_ENABLE_BIT)) {
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  		return 0;
>  	}
>  
> @@ -173,9 +172,9 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
>  		if (ret)
>  			return ret;
>  
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  	} else {
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  		pr_info("DTS is locked. Cannot disable DTS\n");
>  		ret = -EPERM;
>  	}
> @@ -312,8 +311,7 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
>  static int sys_get_mode(struct thermal_zone_device *tzd,
>  				enum thermal_device_mode *mode)
>  {
> -	struct soc_sensor_entry *aux_entry = tzd->devdata;
> -	*mode = aux_entry->mode;
> +	*mode = tzd->mode;
>  	return 0;
>  }
>  
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index ddf88dbe7ba2..c495b1e48ef2 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -51,7 +51,6 @@ struct __thermal_bind_params {
>  
>  /**
>   * struct __thermal_zone - internal representation of a thermal zone
> - * @mode: current thermal zone device mode (enabled/disabled)
>   * @passive_delay: polling interval while passive cooling is activated
>   * @polling_delay: zone polling interval
>   * @slope: slope of the temperature adjustment curve
> @@ -65,7 +64,6 @@ struct __thermal_bind_params {
>   */
>  
>  struct __thermal_zone {
> -	enum thermal_device_mode mode;
>  	int passive_delay;
>  	int polling_delay;
>  	int slope;
> @@ -272,9 +270,7 @@ static int of_thermal_unbind(struct thermal_zone_device *thermal,
>  static int of_thermal_get_mode(struct thermal_zone_device *tz,
>  			       enum thermal_device_mode *mode)
>  {
> -	struct __thermal_zone *data = tz->devdata;
> -
> -	*mode = data->mode;
> +	*mode = tz->mode;
>  
>  	return 0;
>  }
> @@ -296,7 +292,7 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
>  
>  	mutex_unlock(&tz->lock);
>  
> -	data->mode = mode;
> +	tz->mode = mode;
>  	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -979,7 +975,6 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
>  
>  finish:
>  	of_node_put(child);
> -	tz->mode = THERMAL_DEVICE_DISABLED;
>  
>  	return tz;
>  
> @@ -1134,6 +1129,7 @@ int __init of_parse_thermal_zones(void)
>  			of_thermal_free_zone(tz);
>  			/* attempting to build remaining zones still */
>  		}
> +		zone->mode = THERMAL_DEVICE_DISABLED;
>  	}
>  	of_node_put(np);
>  

^ permalink raw reply	[flat|nested] 143+ messages in thread
* Re: [PATCH v4 04/11] thermal: Store device mode in struct thermal_zone_device
@ 2020-05-29 19:09 Guenter Roeck
  0 siblings, 0 replies; 143+ messages in thread
From: Guenter Roeck @ 2020-05-29 19:09 UTC (permalink / raw)
  To: Andrzej Pietrasiewicz
  Cc: linux-pm, linux-acpi, netdev, linux-wireless,
	platform-driver-x86, linux-arm-kernel, linux-renesas-soc,
	linux-rockchip, Emmanuel Grumbach, Heiko Stuebner,
	Rafael J . Wysocki, Vishal Kulkarni, Luca Coelho, Miquel Raynal,
	kernel, Fabio Estevam, Amit Kucheria, Chunyan Zhang,
	Daniel Lezcano, Allison Randal, NXP Linux Team, Darren Hart,
	Zhang Rui, Gayatri Kammela, Len Brown, Johannes Berg,
	Intel Linux Wireless, Sascha Hauer, Ido Schimmel, Baolin Wang,
	Jiri Pirko, Orson Zhai, Thomas Gleixner, Kalle Valo,
	Support Opensource, Enrico Weigelt, Peter Kaestle,
	Sebastian Reichel, Bartlomiej Zolnierkiewicz,
	Pengutronix Kernel Team, Niklas Söderlund, Shawn Guo,
	David S . Miller, Andy Shevchenko

On Thu, May 28, 2020 at 09:20:44PM +0200, Andrzej Pietrasiewicz wrote:
> Prepare for eliminating get_mode().
> 
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

Based on discussion:

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

Guenter

> ---
>  drivers/acpi/thermal.c                        | 18 ++++++----------
>  .../ethernet/mellanox/mlxsw/core_thermal.c    | 21 +++++++------------
>  drivers/platform/x86/acerhdf.c                | 15 ++++++-------
>  drivers/thermal/da9062-thermal.c              |  6 ++----
>  drivers/thermal/imx_thermal.c                 | 17 +++++++--------
>  .../intel/int340x_thermal/int3400_thermal.c   | 12 +++--------
>  .../thermal/intel/intel_quark_dts_thermal.c   | 16 +++++++-------
>  drivers/thermal/thermal_of.c                  | 10 +++------
>  8 files changed, 44 insertions(+), 71 deletions(-)
> 
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index fb46070c66d8..4ba273f49d87 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -172,7 +172,6 @@ struct acpi_thermal {
>  	struct acpi_thermal_trips trips;
>  	struct acpi_handle_list devices;
>  	struct thermal_zone_device *thermal_zone;
> -	enum thermal_device_mode mode;
>  	int kelvin_offset;	/* in millidegrees */
>  	struct work_struct thermal_check_work;
>  };
> @@ -500,7 +499,7 @@ static void acpi_thermal_check(void *data)
>  {
>  	struct acpi_thermal *tz = data;
>  
> -	if (tz->mode != THERMAL_DEVICE_ENABLED)
> +	if (tz->thermal_zone->mode != THERMAL_DEVICE_ENABLED)
>  		return;
>  
>  	thermal_zone_device_update(tz->thermal_zone,
> @@ -529,12 +528,7 @@ static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
>  static int thermal_get_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode *mode)
>  {
> -	struct acpi_thermal *tz = thermal->devdata;
> -
> -	if (!tz)
> -		return -EINVAL;
> -
> -	*mode = tz->mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -556,11 +550,11 @@ static int thermal_set_mode(struct thermal_zone_device *thermal,
>  	if (mode == THERMAL_DEVICE_DISABLED)
>  		pr_warn("thermal zone will be disabled\n");
>  
> -	if (mode != tz->mode) {
> -		tz->mode = mode;
> +	if (mode != tz->thermal_zone->mode) {
> +		tz->thermal_zone->mode = mode;
>  		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
>  			"%s kernel ACPI thermal control\n",
> -			tz->mode == THERMAL_DEVICE_ENABLED ?
> +			tz->thermal_zone->mode == THERMAL_DEVICE_ENABLED ?
>  			"Enable" : "Disable"));
>  		acpi_thermal_check(tz);
>  	}
> @@ -912,7 +906,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
>  		goto remove_dev_link;
>  	}
>  
> -	tz->mode = THERMAL_DEVICE_ENABLED;
> +	tz->thermal_zone->mode = THERMAL_DEVICE_ENABLED;
>  
>  	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
>  		 tz->thermal_zone->id);
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> index ce0a6837daa3..aa082e8a0b13 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> @@ -98,7 +98,6 @@ struct mlxsw_thermal_module {
>  	struct mlxsw_thermal *parent;
>  	struct thermal_zone_device *tzdev;
>  	struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
> -	enum thermal_device_mode mode;
>  	int module; /* Module or gearbox number */
>  };
>  
> @@ -110,7 +109,6 @@ struct mlxsw_thermal {
>  	struct thermal_cooling_device *cdevs[MLXSW_MFCR_PWMS_MAX];
>  	u8 cooling_levels[MLXSW_THERMAL_MAX_STATE + 1];
>  	struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
> -	enum thermal_device_mode mode;
>  	struct mlxsw_thermal_module *tz_module_arr;
>  	u8 tz_module_num;
>  	struct mlxsw_thermal_module *tz_gearbox_arr;
> @@ -280,9 +278,7 @@ static int mlxsw_thermal_unbind(struct thermal_zone_device *tzdev,
>  static int mlxsw_thermal_get_mode(struct thermal_zone_device *tzdev,
>  				  enum thermal_device_mode *mode)
>  {
> -	struct mlxsw_thermal *thermal = tzdev->devdata;
> -
> -	*mode = thermal->mode;
> +	*mode = tzdev->mode;
>  
>  	return 0;
>  }
> @@ -299,9 +295,9 @@ static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
>  	else
>  		tzdev->polling_delay = 0;
>  
> +	tzdev->mode = mode;
>  	mutex_unlock(&tzdev->lock);
>  
> -	thermal->mode = mode;
>  	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -469,9 +465,7 @@ static int mlxsw_thermal_module_unbind(struct thermal_zone_device *tzdev,
>  static int mlxsw_thermal_module_mode_get(struct thermal_zone_device *tzdev,
>  					 enum thermal_device_mode *mode)
>  {
> -	struct mlxsw_thermal_module *tz = tzdev->devdata;
> -
> -	*mode = tz->mode;
> +	*mode = tzdev->mode;
>  
>  	return 0;
>  }
> @@ -489,9 +483,10 @@ static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
>  	else
>  		tzdev->polling_delay = 0;
>  
> +	tzdev->mode = mode;
> +
>  	mutex_unlock(&tzdev->lock);
>  
> -	tz->mode = mode;
>  	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -765,7 +760,7 @@ mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
>  		return err;
>  	}
>  
> -	module_tz->mode = THERMAL_DEVICE_ENABLED;
> +	module_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	return 0;
>  }
>  
> @@ -881,7 +876,7 @@ mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
>  	if (IS_ERR(gearbox_tz->tzdev))
>  		return PTR_ERR(gearbox_tz->tzdev);
>  
> -	gearbox_tz->mode = THERMAL_DEVICE_ENABLED;
> +	gearbox_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	return 0;
>  }
>  
> @@ -1050,7 +1045,7 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
>  	if (err)
>  		goto err_unreg_modules_tzdev;
>  
> -	thermal->mode = THERMAL_DEVICE_ENABLED;
> +	thermal->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	*p_thermal = thermal;
>  	return 0;
>  
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 830a8b060e74..97b288485837 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -68,7 +68,6 @@ static int kernelmode = 1;
>  #else
>  static int kernelmode;
>  #endif
> -static enum thermal_device_mode thermal_mode;
>  
>  static unsigned int interval = 10;
>  static unsigned int fanon = 60000;
> @@ -398,15 +397,16 @@ static inline void acerhdf_revert_to_bios_mode(void)
>  {
>  	acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
>  	kernelmode = 0;
> -	thermal_mode = THERMAL_DEVICE_DISABLED;
> -	if (thz_dev)
> +	if (thz_dev) {
> +		thz_dev->mode = THERMAL_DEVICE_DISABLED;
>  		thz_dev->polling_delay = 0;
> +	}
>  	pr_notice("kernel mode fan control OFF\n");
>  }
>  static inline void acerhdf_enable_kernelmode(void)
>  {
>  	kernelmode = 1;
> -	thermal_mode = THERMAL_DEVICE_ENABLED;
> +	thz_dev->mode = THERMAL_DEVICE_ENABLED;
>  
>  	thz_dev->polling_delay = interval*1000;
>  	thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
> @@ -419,7 +419,7 @@ static int acerhdf_get_mode(struct thermal_zone_device *thermal,
>  	if (verbose)
>  		pr_notice("kernel mode fan control %d\n", kernelmode);
>  
> -	*mode = thermal_mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -741,8 +741,6 @@ static int __init acerhdf_register_thermal(void)
>  	if (IS_ERR(cl_dev))
>  		return -EINVAL;
>  
> -	thermal_mode = kernelmode ?
> -		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
>  	thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
>  					      &acerhdf_dev_ops,
>  					      &acerhdf_zone_params, 0,
> @@ -750,6 +748,9 @@ static int __init acerhdf_register_thermal(void)
>  	if (IS_ERR(thz_dev))
>  		return -EINVAL;
>  
> +	thz_dev->mode = kernelmode ?
> +		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
> +
>  	if (strcmp(thz_dev->governor->name,
>  				acerhdf_zone_params.governor_name)) {
>  		pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
> diff --git a/drivers/thermal/da9062-thermal.c b/drivers/thermal/da9062-thermal.c
> index c32709badeda..a14c7981c7c7 100644
> --- a/drivers/thermal/da9062-thermal.c
> +++ b/drivers/thermal/da9062-thermal.c
> @@ -49,7 +49,6 @@ struct da9062_thermal {
>  	struct da9062 *hw;
>  	struct delayed_work work;
>  	struct thermal_zone_device *zone;
> -	enum thermal_device_mode mode;
>  	struct mutex lock; /* protection for da9062_thermal temperature */
>  	int temperature;
>  	int irq;
> @@ -124,8 +123,7 @@ static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
>  static int da9062_thermal_get_mode(struct thermal_zone_device *z,
>  				   enum thermal_device_mode *mode)
>  {
> -	struct da9062_thermal *thermal = z->devdata;
> -	*mode = thermal->mode;
> +	*mode = z->mode;
>  	return 0;
>  }
>  
> @@ -233,7 +231,6 @@ static int da9062_thermal_probe(struct platform_device *pdev)
>  
>  	thermal->config = match->data;
>  	thermal->hw = chip;
> -	thermal->mode = THERMAL_DEVICE_ENABLED;
>  	thermal->dev = &pdev->dev;
>  
>  	INIT_DELAYED_WORK(&thermal->work, da9062_thermal_poll_on);
> @@ -248,6 +245,7 @@ static int da9062_thermal_probe(struct platform_device *pdev)
>  		ret = PTR_ERR(thermal->zone);
>  		goto err;
>  	}
> +	thermal->zone->mode = THERMAL_DEVICE_ENABLED;
>  
>  	dev_dbg(&pdev->dev,
>  		"TJUNC temperature polling period set at %d ms\n",
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index e761c9b42217..9a1114d721b6 100644
> --- a/drivers/thermal/imx_thermal.c
> +++ b/drivers/thermal/imx_thermal.c
> @@ -197,7 +197,6 @@ struct imx_thermal_data {
>  	struct cpufreq_policy *policy;
>  	struct thermal_zone_device *tz;
>  	struct thermal_cooling_device *cdev;
> -	enum thermal_device_mode mode;
>  	struct regmap *tempmon;
>  	u32 c1, c2; /* See formula in imx_init_calib() */
>  	int temp_passive;
> @@ -256,7 +255,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  	bool wait;
>  	u32 val;
>  
> -	if (data->mode == THERMAL_DEVICE_ENABLED) {
> +	if (tz->mode == THERMAL_DEVICE_ENABLED) {
>  		/* Check if a measurement is currently in progress */
>  		regmap_read(map, soc_data->temp_data, &val);
>  		wait = !(val & soc_data->temp_valid_mask);
> @@ -283,7 +282,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  
>  	regmap_read(map, soc_data->temp_data, &val);
>  
> -	if (data->mode != THERMAL_DEVICE_ENABLED) {
> +	if (tz->mode != THERMAL_DEVICE_ENABLED) {
>  		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
>  			     soc_data->measure_temp_mask);
>  		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
> @@ -334,9 +333,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  static int imx_get_mode(struct thermal_zone_device *tz,
>  			enum thermal_device_mode *mode)
>  {
> -	struct imx_thermal_data *data = tz->devdata;
> -
> -	*mode = data->mode;
> +	*mode = tz->mode;
>  
>  	return 0;
>  }
> @@ -376,7 +373,7 @@ static int imx_set_mode(struct thermal_zone_device *tz,
>  		}
>  	}
>  
> -	data->mode = mode;
> +	tz->mode = mode;
>  	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -831,7 +828,7 @@ static int imx_thermal_probe(struct platform_device *pdev)
>  		     data->socdata->measure_temp_mask);
>  
>  	data->irq_enabled = true;
> -	data->mode = THERMAL_DEVICE_ENABLED;
> +	data->tz->mode = THERMAL_DEVICE_ENABLED;
>  
>  	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
>  			imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
> @@ -885,7 +882,7 @@ static int __maybe_unused imx_thermal_suspend(struct device *dev)
>  		     data->socdata->measure_temp_mask);
>  	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
>  		     data->socdata->power_down_mask);
> -	data->mode = THERMAL_DEVICE_DISABLED;
> +	data->tz->mode = THERMAL_DEVICE_DISABLED;
>  	clk_disable_unprepare(data->thermal_clk);
>  
>  	return 0;
> @@ -905,7 +902,7 @@ static int __maybe_unused imx_thermal_resume(struct device *dev)
>  		     data->socdata->power_down_mask);
>  	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
>  		     data->socdata->measure_temp_mask);
> -	data->mode = THERMAL_DEVICE_ENABLED;
> +	data->tz->mode = THERMAL_DEVICE_ENABLED;
>  
>  	return 0;
>  }
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index e84faaadff87..f65b2fc09198 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -48,7 +48,6 @@ struct int3400_thermal_priv {
>  	struct acpi_device *adev;
>  	struct platform_device *pdev;
>  	struct thermal_zone_device *thermal;
> -	enum thermal_device_mode mode;
>  	int art_count;
>  	struct art *arts;
>  	int trt_count;
> @@ -381,12 +380,7 @@ static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
>  static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode *mode)
>  {
> -	struct int3400_thermal_priv *priv = thermal->devdata;
> -
> -	if (!priv)
> -		return -EINVAL;
> -
> -	*mode = priv->mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -404,8 +398,8 @@ static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
>  	    mode != THERMAL_DEVICE_DISABLED)
>  		return -EINVAL;
>  
> -	if (mode != priv->mode) {
> -		priv->mode = mode;
> +	if (mode != thermal->mode) {
> +		thermal->mode = mode;
>  		result = int3400_thermal_run_osc(priv->adev->handle,
>  						priv->current_uuid_index,
>  						mode == THERMAL_DEVICE_ENABLED);
> diff --git a/drivers/thermal/intel/intel_quark_dts_thermal.c b/drivers/thermal/intel/intel_quark_dts_thermal.c
> index d704fc104cfd..d77cb3df5ade 100644
> --- a/drivers/thermal/intel/intel_quark_dts_thermal.c
> +++ b/drivers/thermal/intel/intel_quark_dts_thermal.c
> @@ -103,7 +103,6 @@ struct soc_sensor_entry {
>  	bool locked;
>  	u32 store_ptps;
>  	u32 store_dts_enable;
> -	enum thermal_device_mode mode;
>  	struct thermal_zone_device *tzone;
>  };
>  
> @@ -128,7 +127,7 @@ static int soc_dts_enable(struct thermal_zone_device *tzd)
>  		return ret;
>  
>  	if (out & QRK_DTS_ENABLE_BIT) {
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  		return 0;
>  	}
>  
> @@ -139,9 +138,9 @@ static int soc_dts_enable(struct thermal_zone_device *tzd)
>  		if (ret)
>  			return ret;
>  
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  	} else {
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  		pr_info("DTS is locked. Cannot enable DTS\n");
>  		ret = -EPERM;
>  	}
> @@ -161,7 +160,7 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
>  		return ret;
>  
>  	if (!(out & QRK_DTS_ENABLE_BIT)) {
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  		return 0;
>  	}
>  
> @@ -173,9 +172,9 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
>  		if (ret)
>  			return ret;
>  
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  	} else {
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  		pr_info("DTS is locked. Cannot disable DTS\n");
>  		ret = -EPERM;
>  	}
> @@ -312,8 +311,7 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
>  static int sys_get_mode(struct thermal_zone_device *tzd,
>  				enum thermal_device_mode *mode)
>  {
> -	struct soc_sensor_entry *aux_entry = tzd->devdata;
> -	*mode = aux_entry->mode;
> +	*mode = tzd->mode;
>  	return 0;
>  }
>  
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index ddf88dbe7ba2..c495b1e48ef2 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -51,7 +51,6 @@ struct __thermal_bind_params {
>  
>  /**
>   * struct __thermal_zone - internal representation of a thermal zone
> - * @mode: current thermal zone device mode (enabled/disabled)
>   * @passive_delay: polling interval while passive cooling is activated
>   * @polling_delay: zone polling interval
>   * @slope: slope of the temperature adjustment curve
> @@ -65,7 +64,6 @@ struct __thermal_bind_params {
>   */
>  
>  struct __thermal_zone {
> -	enum thermal_device_mode mode;
>  	int passive_delay;
>  	int polling_delay;
>  	int slope;
> @@ -272,9 +270,7 @@ static int of_thermal_unbind(struct thermal_zone_device *thermal,
>  static int of_thermal_get_mode(struct thermal_zone_device *tz,
>  			       enum thermal_device_mode *mode)
>  {
> -	struct __thermal_zone *data = tz->devdata;
> -
> -	*mode = data->mode;
> +	*mode = tz->mode;
>  
>  	return 0;
>  }
> @@ -296,7 +292,7 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
>  
>  	mutex_unlock(&tz->lock);
>  
> -	data->mode = mode;
> +	tz->mode = mode;
>  	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -979,7 +975,6 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
>  
>  finish:
>  	of_node_put(child);
> -	tz->mode = THERMAL_DEVICE_DISABLED;
>  
>  	return tz;
>  
> @@ -1134,6 +1129,7 @@ int __init of_parse_thermal_zones(void)
>  			of_thermal_free_zone(tz);
>  			/* attempting to build remaining zones still */
>  		}
> +		zone->mode = THERMAL_DEVICE_DISABLED;
>  	}
>  	of_node_put(np);
>  

^ permalink raw reply	[flat|nested] 143+ messages in thread
* Re: [PATCH v4 04/11] thermal: Store device mode in struct thermal_zone_device
@ 2020-05-29 15:42 Guenter Roeck
  2020-05-29 16:08 ` Andrzej Pietrasiewicz
  0 siblings, 1 reply; 143+ messages in thread
From: Guenter Roeck @ 2020-05-29 15:42 UTC (permalink / raw)
  To: Andrzej Pietrasiewicz
  Cc: linux-pm, linux-acpi, netdev, linux-wireless,
	platform-driver-x86, linux-arm-kernel, linux-renesas-soc,
	linux-rockchip, Emmanuel Grumbach, Heiko Stuebner,
	Rafael J . Wysocki, Vishal Kulkarni, Luca Coelho, Miquel Raynal,
	kernel, Fabio Estevam, Amit Kucheria, Chunyan Zhang,
	Daniel Lezcano, Allison Randal, NXP Linux Team, Darren Hart,
	Zhang Rui, Gayatri Kammela, Len Brown, Johannes Berg,
	Intel Linux Wireless, Sascha Hauer, Ido Schimmel, Baolin Wang,
	Jiri Pirko, Orson Zhai, Thomas Gleixner, Kalle Valo,
	Support Opensource, Enrico Weigelt, Peter Kaestle,
	Sebastian Reichel, Bartlomiej Zolnierkiewicz,
	Pengutronix Kernel Team, Niklas Söderlund, Shawn Guo,
	David S . Miller, Andy Shevchenko

On Thu, May 28, 2020 at 09:20:44PM +0200, Andrzej Pietrasiewicz wrote:
> Prepare for eliminating get_mode().
> 
Might be worthwhile to explain (not only in the subject) what you are
doing here.

> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> ---
>  drivers/acpi/thermal.c                        | 18 ++++++----------
>  .../ethernet/mellanox/mlxsw/core_thermal.c    | 21 +++++++------------
>  drivers/platform/x86/acerhdf.c                | 15 ++++++-------
>  drivers/thermal/da9062-thermal.c              |  6 ++----
>  drivers/thermal/imx_thermal.c                 | 17 +++++++--------
>  .../intel/int340x_thermal/int3400_thermal.c   | 12 +++--------
>  .../thermal/intel/intel_quark_dts_thermal.c   | 16 +++++++-------
>  drivers/thermal/thermal_of.c                  | 10 +++------

After this patch is applied on top of the thermal 'testing' branch,
there are still local instances of thermal_device_mode in
	drivers/thermal/st/stm_thermal.c
	drivers/thermal/ti-soc-thermal/ti-thermal-common.c

If there is a reason not to replace those, it might make sense to explain
it here.

Thanks,
Guenter

>  8 files changed, 44 insertions(+), 71 deletions(-)
> 
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index fb46070c66d8..4ba273f49d87 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -172,7 +172,6 @@ struct acpi_thermal {
>  	struct acpi_thermal_trips trips;
>  	struct acpi_handle_list devices;
>  	struct thermal_zone_device *thermal_zone;
> -	enum thermal_device_mode mode;
>  	int kelvin_offset;	/* in millidegrees */
>  	struct work_struct thermal_check_work;
>  };
> @@ -500,7 +499,7 @@ static void acpi_thermal_check(void *data)
>  {
>  	struct acpi_thermal *tz = data;
>  
> -	if (tz->mode != THERMAL_DEVICE_ENABLED)
> +	if (tz->thermal_zone->mode != THERMAL_DEVICE_ENABLED)
>  		return;
>  
>  	thermal_zone_device_update(tz->thermal_zone,
> @@ -529,12 +528,7 @@ static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
>  static int thermal_get_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode *mode)
>  {
> -	struct acpi_thermal *tz = thermal->devdata;
> -
> -	if (!tz)
> -		return -EINVAL;
> -
> -	*mode = tz->mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -556,11 +550,11 @@ static int thermal_set_mode(struct thermal_zone_device *thermal,
>  	if (mode == THERMAL_DEVICE_DISABLED)
>  		pr_warn("thermal zone will be disabled\n");
>  
> -	if (mode != tz->mode) {
> -		tz->mode = mode;
> +	if (mode != tz->thermal_zone->mode) {
> +		tz->thermal_zone->mode = mode;
>  		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
>  			"%s kernel ACPI thermal control\n",
> -			tz->mode == THERMAL_DEVICE_ENABLED ?
> +			tz->thermal_zone->mode == THERMAL_DEVICE_ENABLED ?
>  			"Enable" : "Disable"));
>  		acpi_thermal_check(tz);
>  	}
> @@ -912,7 +906,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
>  		goto remove_dev_link;
>  	}
>  
> -	tz->mode = THERMAL_DEVICE_ENABLED;
> +	tz->thermal_zone->mode = THERMAL_DEVICE_ENABLED;
>  
>  	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
>  		 tz->thermal_zone->id);
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> index ce0a6837daa3..aa082e8a0b13 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> @@ -98,7 +98,6 @@ struct mlxsw_thermal_module {
>  	struct mlxsw_thermal *parent;
>  	struct thermal_zone_device *tzdev;
>  	struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
> -	enum thermal_device_mode mode;
>  	int module; /* Module or gearbox number */
>  };
>  
> @@ -110,7 +109,6 @@ struct mlxsw_thermal {
>  	struct thermal_cooling_device *cdevs[MLXSW_MFCR_PWMS_MAX];
>  	u8 cooling_levels[MLXSW_THERMAL_MAX_STATE + 1];
>  	struct mlxsw_thermal_trip trips[MLXSW_THERMAL_NUM_TRIPS];
> -	enum thermal_device_mode mode;
>  	struct mlxsw_thermal_module *tz_module_arr;
>  	u8 tz_module_num;
>  	struct mlxsw_thermal_module *tz_gearbox_arr;
> @@ -280,9 +278,7 @@ static int mlxsw_thermal_unbind(struct thermal_zone_device *tzdev,
>  static int mlxsw_thermal_get_mode(struct thermal_zone_device *tzdev,
>  				  enum thermal_device_mode *mode)
>  {
> -	struct mlxsw_thermal *thermal = tzdev->devdata;
> -
> -	*mode = thermal->mode;
> +	*mode = tzdev->mode;
>  
>  	return 0;
>  }
> @@ -299,9 +295,9 @@ static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
>  	else
>  		tzdev->polling_delay = 0;
>  
> +	tzdev->mode = mode;
>  	mutex_unlock(&tzdev->lock);
>  
> -	thermal->mode = mode;
>  	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -469,9 +465,7 @@ static int mlxsw_thermal_module_unbind(struct thermal_zone_device *tzdev,
>  static int mlxsw_thermal_module_mode_get(struct thermal_zone_device *tzdev,
>  					 enum thermal_device_mode *mode)
>  {
> -	struct mlxsw_thermal_module *tz = tzdev->devdata;
> -
> -	*mode = tz->mode;
> +	*mode = tzdev->mode;
>  
>  	return 0;
>  }
> @@ -489,9 +483,10 @@ static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
>  	else
>  		tzdev->polling_delay = 0;
>  
> +	tzdev->mode = mode;
> +
>  	mutex_unlock(&tzdev->lock);
>  
> -	tz->mode = mode;
>  	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -765,7 +760,7 @@ mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
>  		return err;
>  	}
>  
> -	module_tz->mode = THERMAL_DEVICE_ENABLED;
> +	module_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	return 0;
>  }
>  
> @@ -881,7 +876,7 @@ mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
>  	if (IS_ERR(gearbox_tz->tzdev))
>  		return PTR_ERR(gearbox_tz->tzdev);
>  
> -	gearbox_tz->mode = THERMAL_DEVICE_ENABLED;
> +	gearbox_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	return 0;
>  }
>  
> @@ -1050,7 +1045,7 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
>  	if (err)
>  		goto err_unreg_modules_tzdev;
>  
> -	thermal->mode = THERMAL_DEVICE_ENABLED;
> +	thermal->tzdev->mode = THERMAL_DEVICE_ENABLED;
>  	*p_thermal = thermal;
>  	return 0;
>  
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 830a8b060e74..97b288485837 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -68,7 +68,6 @@ static int kernelmode = 1;
>  #else
>  static int kernelmode;
>  #endif
> -static enum thermal_device_mode thermal_mode;
>  
>  static unsigned int interval = 10;
>  static unsigned int fanon = 60000;
> @@ -398,15 +397,16 @@ static inline void acerhdf_revert_to_bios_mode(void)
>  {
>  	acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
>  	kernelmode = 0;
> -	thermal_mode = THERMAL_DEVICE_DISABLED;
> -	if (thz_dev)
> +	if (thz_dev) {
> +		thz_dev->mode = THERMAL_DEVICE_DISABLED;
>  		thz_dev->polling_delay = 0;
> +	}
>  	pr_notice("kernel mode fan control OFF\n");
>  }
>  static inline void acerhdf_enable_kernelmode(void)
>  {
>  	kernelmode = 1;
> -	thermal_mode = THERMAL_DEVICE_ENABLED;
> +	thz_dev->mode = THERMAL_DEVICE_ENABLED;
>  
>  	thz_dev->polling_delay = interval*1000;
>  	thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
> @@ -419,7 +419,7 @@ static int acerhdf_get_mode(struct thermal_zone_device *thermal,
>  	if (verbose)
>  		pr_notice("kernel mode fan control %d\n", kernelmode);
>  
> -	*mode = thermal_mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -741,8 +741,6 @@ static int __init acerhdf_register_thermal(void)
>  	if (IS_ERR(cl_dev))
>  		return -EINVAL;
>  
> -	thermal_mode = kernelmode ?
> -		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
>  	thz_dev = thermal_zone_device_register("acerhdf", 2, 0, NULL,
>  					      &acerhdf_dev_ops,
>  					      &acerhdf_zone_params, 0,
> @@ -750,6 +748,9 @@ static int __init acerhdf_register_thermal(void)
>  	if (IS_ERR(thz_dev))
>  		return -EINVAL;
>  
> +	thz_dev->mode = kernelmode ?
> +		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
> +
>  	if (strcmp(thz_dev->governor->name,
>  				acerhdf_zone_params.governor_name)) {
>  		pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
> diff --git a/drivers/thermal/da9062-thermal.c b/drivers/thermal/da9062-thermal.c
> index c32709badeda..a14c7981c7c7 100644
> --- a/drivers/thermal/da9062-thermal.c
> +++ b/drivers/thermal/da9062-thermal.c
> @@ -49,7 +49,6 @@ struct da9062_thermal {
>  	struct da9062 *hw;
>  	struct delayed_work work;
>  	struct thermal_zone_device *zone;
> -	enum thermal_device_mode mode;
>  	struct mutex lock; /* protection for da9062_thermal temperature */
>  	int temperature;
>  	int irq;
> @@ -124,8 +123,7 @@ static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
>  static int da9062_thermal_get_mode(struct thermal_zone_device *z,
>  				   enum thermal_device_mode *mode)
>  {
> -	struct da9062_thermal *thermal = z->devdata;
> -	*mode = thermal->mode;
> +	*mode = z->mode;
>  	return 0;
>  }
>  
> @@ -233,7 +231,6 @@ static int da9062_thermal_probe(struct platform_device *pdev)
>  
>  	thermal->config = match->data;
>  	thermal->hw = chip;
> -	thermal->mode = THERMAL_DEVICE_ENABLED;
>  	thermal->dev = &pdev->dev;
>  
>  	INIT_DELAYED_WORK(&thermal->work, da9062_thermal_poll_on);
> @@ -248,6 +245,7 @@ static int da9062_thermal_probe(struct platform_device *pdev)
>  		ret = PTR_ERR(thermal->zone);
>  		goto err;
>  	}
> +	thermal->zone->mode = THERMAL_DEVICE_ENABLED;
>  
>  	dev_dbg(&pdev->dev,
>  		"TJUNC temperature polling period set at %d ms\n",
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index e761c9b42217..9a1114d721b6 100644
> --- a/drivers/thermal/imx_thermal.c
> +++ b/drivers/thermal/imx_thermal.c
> @@ -197,7 +197,6 @@ struct imx_thermal_data {
>  	struct cpufreq_policy *policy;
>  	struct thermal_zone_device *tz;
>  	struct thermal_cooling_device *cdev;
> -	enum thermal_device_mode mode;
>  	struct regmap *tempmon;
>  	u32 c1, c2; /* See formula in imx_init_calib() */
>  	int temp_passive;
> @@ -256,7 +255,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  	bool wait;
>  	u32 val;
>  
> -	if (data->mode == THERMAL_DEVICE_ENABLED) {
> +	if (tz->mode == THERMAL_DEVICE_ENABLED) {
>  		/* Check if a measurement is currently in progress */
>  		regmap_read(map, soc_data->temp_data, &val);
>  		wait = !(val & soc_data->temp_valid_mask);
> @@ -283,7 +282,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  
>  	regmap_read(map, soc_data->temp_data, &val);
>  
> -	if (data->mode != THERMAL_DEVICE_ENABLED) {
> +	if (tz->mode != THERMAL_DEVICE_ENABLED) {
>  		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
>  			     soc_data->measure_temp_mask);
>  		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
> @@ -334,9 +333,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
>  static int imx_get_mode(struct thermal_zone_device *tz,
>  			enum thermal_device_mode *mode)
>  {
> -	struct imx_thermal_data *data = tz->devdata;
> -
> -	*mode = data->mode;
> +	*mode = tz->mode;
>  
>  	return 0;
>  }
> @@ -376,7 +373,7 @@ static int imx_set_mode(struct thermal_zone_device *tz,
>  		}
>  	}
>  
> -	data->mode = mode;
> +	tz->mode = mode;
>  	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -831,7 +828,7 @@ static int imx_thermal_probe(struct platform_device *pdev)
>  		     data->socdata->measure_temp_mask);
>  
>  	data->irq_enabled = true;
> -	data->mode = THERMAL_DEVICE_ENABLED;
> +	data->tz->mode = THERMAL_DEVICE_ENABLED;
>  
>  	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
>  			imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
> @@ -885,7 +882,7 @@ static int __maybe_unused imx_thermal_suspend(struct device *dev)
>  		     data->socdata->measure_temp_mask);
>  	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
>  		     data->socdata->power_down_mask);
> -	data->mode = THERMAL_DEVICE_DISABLED;
> +	data->tz->mode = THERMAL_DEVICE_DISABLED;
>  	clk_disable_unprepare(data->thermal_clk);
>  
>  	return 0;
> @@ -905,7 +902,7 @@ static int __maybe_unused imx_thermal_resume(struct device *dev)
>  		     data->socdata->power_down_mask);
>  	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
>  		     data->socdata->measure_temp_mask);
> -	data->mode = THERMAL_DEVICE_ENABLED;
> +	data->tz->mode = THERMAL_DEVICE_ENABLED;
>  
>  	return 0;
>  }
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index e84faaadff87..f65b2fc09198 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -48,7 +48,6 @@ struct int3400_thermal_priv {
>  	struct acpi_device *adev;
>  	struct platform_device *pdev;
>  	struct thermal_zone_device *thermal;
> -	enum thermal_device_mode mode;
>  	int art_count;
>  	struct art *arts;
>  	int trt_count;
> @@ -381,12 +380,7 @@ static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
>  static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
>  				enum thermal_device_mode *mode)
>  {
> -	struct int3400_thermal_priv *priv = thermal->devdata;
> -
> -	if (!priv)
> -		return -EINVAL;
> -
> -	*mode = priv->mode;
> +	*mode = thermal->mode;
>  
>  	return 0;
>  }
> @@ -404,8 +398,8 @@ static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
>  	    mode != THERMAL_DEVICE_DISABLED)
>  		return -EINVAL;
>  
> -	if (mode != priv->mode) {
> -		priv->mode = mode;
> +	if (mode != thermal->mode) {
> +		thermal->mode = mode;
>  		result = int3400_thermal_run_osc(priv->adev->handle,
>  						priv->current_uuid_index,
>  						mode == THERMAL_DEVICE_ENABLED);
> diff --git a/drivers/thermal/intel/intel_quark_dts_thermal.c b/drivers/thermal/intel/intel_quark_dts_thermal.c
> index d704fc104cfd..d77cb3df5ade 100644
> --- a/drivers/thermal/intel/intel_quark_dts_thermal.c
> +++ b/drivers/thermal/intel/intel_quark_dts_thermal.c
> @@ -103,7 +103,6 @@ struct soc_sensor_entry {
>  	bool locked;
>  	u32 store_ptps;
>  	u32 store_dts_enable;
> -	enum thermal_device_mode mode;
>  	struct thermal_zone_device *tzone;
>  };
>  
> @@ -128,7 +127,7 @@ static int soc_dts_enable(struct thermal_zone_device *tzd)
>  		return ret;
>  
>  	if (out & QRK_DTS_ENABLE_BIT) {
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  		return 0;
>  	}
>  
> @@ -139,9 +138,9 @@ static int soc_dts_enable(struct thermal_zone_device *tzd)
>  		if (ret)
>  			return ret;
>  
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  	} else {
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  		pr_info("DTS is locked. Cannot enable DTS\n");
>  		ret = -EPERM;
>  	}
> @@ -161,7 +160,7 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
>  		return ret;
>  
>  	if (!(out & QRK_DTS_ENABLE_BIT)) {
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  		return 0;
>  	}
>  
> @@ -173,9 +172,9 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
>  		if (ret)
>  			return ret;
>  
> -		aux_entry->mode = THERMAL_DEVICE_DISABLED;
> +		tzd->mode = THERMAL_DEVICE_DISABLED;
>  	} else {
> -		aux_entry->mode = THERMAL_DEVICE_ENABLED;
> +		tzd->mode = THERMAL_DEVICE_ENABLED;
>  		pr_info("DTS is locked. Cannot disable DTS\n");
>  		ret = -EPERM;
>  	}
> @@ -312,8 +311,7 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
>  static int sys_get_mode(struct thermal_zone_device *tzd,
>  				enum thermal_device_mode *mode)
>  {
> -	struct soc_sensor_entry *aux_entry = tzd->devdata;
> -	*mode = aux_entry->mode;
> +	*mode = tzd->mode;
>  	return 0;
>  }
>  
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index ddf88dbe7ba2..c495b1e48ef2 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -51,7 +51,6 @@ struct __thermal_bind_params {
>  
>  /**
>   * struct __thermal_zone - internal representation of a thermal zone
> - * @mode: current thermal zone device mode (enabled/disabled)
>   * @passive_delay: polling interval while passive cooling is activated
>   * @polling_delay: zone polling interval
>   * @slope: slope of the temperature adjustment curve
> @@ -65,7 +64,6 @@ struct __thermal_bind_params {
>   */
>  
>  struct __thermal_zone {
> -	enum thermal_device_mode mode;
>  	int passive_delay;
>  	int polling_delay;
>  	int slope;
> @@ -272,9 +270,7 @@ static int of_thermal_unbind(struct thermal_zone_device *thermal,
>  static int of_thermal_get_mode(struct thermal_zone_device *tz,
>  			       enum thermal_device_mode *mode)
>  {
> -	struct __thermal_zone *data = tz->devdata;
> -
> -	*mode = data->mode;
> +	*mode = tz->mode;
>  
>  	return 0;
>  }
> @@ -296,7 +292,7 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
>  
>  	mutex_unlock(&tz->lock);
>  
> -	data->mode = mode;
> +	tz->mode = mode;
>  	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
>  
>  	return 0;
> @@ -979,7 +975,6 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
>  
>  finish:
>  	of_node_put(child);
> -	tz->mode = THERMAL_DEVICE_DISABLED;
>  
>  	return tz;
>  
> @@ -1134,6 +1129,7 @@ int __init of_parse_thermal_zones(void)
>  			of_thermal_free_zone(tz);
>  			/* attempting to build remaining zones still */
>  		}
> +		zone->mode = THERMAL_DEVICE_DISABLED;
>  	}
>  	of_node_put(np);
>  

^ permalink raw reply	[flat|nested] 143+ messages in thread
* [RFC 0/8] Stop monitoring disabled devices
@ 2020-04-07 17:49 Andrzej Pietrasiewicz
  2020-04-07 17:49 ` [RFC 1/8] thermal: int3400_thermal: Statically initialize .get_mode()/.set_mode() ops Andrzej Pietrasiewicz
                   ` (8 more replies)
  0 siblings, 9 replies; 143+ messages in thread
From: Andrzej Pietrasiewicz @ 2020-04-07 17:49 UTC (permalink / raw)
  To: linux-pm
  Cc: Zhang Rui, Rafael J . Wysocki, Len Brown, Jiri Pirko,
	Ido Schimmel, David S . Miller, Peter Kaestle, Darren Hart,
	Andy Shevchenko, Support Opensource, Daniel Lezcano,
	Amit Kucheria, Shawn Guo, Sascha Hauer, Pengutronix Kernel Team,
	Fabio Estevam, NXP Linux Team, Allison Randal, Enrico Weigelt,
	Gayatri Kammela, Thomas Gleixner, linux-acpi, netdev,
	platform-driver-x86, linux-arm-kernel, kernel,
	Andrzej Pietrasiewicz

The current kernel behavior is to keep polling the thermal zone devices
regardless of their current mode. This is not desired, as all such "disabled"
devices are meant to be handled by userspace, so polling them makes no sense.

There was an attempt to solve this issue:

https://lkml.org/lkml/2018/2/26/498

and it ultimately has not succeeded:

https://lkml.org/lkml/2018/2/27/910

This is a new attempt addressing all the relevant drivers, and I have
identified them with:

$ git grep "thermal_zone_device_ops" | grep "= {" | cut -f1 -d: | sort | uniq

The idea is to modify thermal_zone_device_update() and monitor_thermal_zone()
in such a way that they stop polling a disabled device. To do decide what to
do they should call ->get_mode() operation of the specialized thermal zone
device in question (e.g. drivers/acpi/thermal.c's). But here comes problem:
sometimes a thermal zone device must be initially disabled and becomes enabled
only after its sensors appear on the system. If such thermal zone's
->get_mode() /* in the context of thermal_zone_device_update() or
monitor_thermal_zone() */ is called _before_ the sensors are available, it will
be reported as "disabled" and consequently polling it will be ceased. This is
a change in behavior from userspace's perspective.

To solve the above described problem I want to introduce the third mode of a
thermal_zone_device: initial. The idea is that when the device is in its
initial mode, then its polling will be handled as it is now. This is a good
thing: should the temperature be just about hitting the critical treshnold
early during the boot process, it might be too late if we wait for the
userspace to run to save the system from overheating. The initial mode should
be reported in sysfs as "enabled" to keep the userspace interface intact.
From the initial mode there will be two possible transitions: to enabled or
disabled mode, but there will be no transition back to initial. If the
transition is from initial to enabled, then keep polling. If the transition is
from initial to disabled, then stop polling. If the transition is from enabled
to disabled, then stop polling. The transition from disabled to enabled must
be handled in a special way: there must be a mandatory call to
monitor_thermal_zone(), otherwise the polling will not start. If this
transition is triggeted from sysfs, then it can be easily handled at the
thermal framework level. However, if drivers call their own ->set_mode()
operation then they must also call "monitor_thermal_zone()" afterwards.
The latter being a sensible thing anyway, so perhaps all/most of the drivers
in question do. The plan for implementation is this:

- ensure ALL users use symbolic enum names (THERMAL_DEVICE_DISABLED,
THERMAL_DEVICE_ENABLED) for thermal device mode rather than the numeric
values of enum thermal_device_mode elements
- add THERMAL_DEVICE_INITIAL to the said enum making its value 0 (so that
kzalloc() results in the initial state)
- modify thermal zone device's mode_show() (thermal framework level) so that
it reports "enabled" for THERMAL_DEVICE_INITIAL
- modify thermal zone device's mode_store() (thermal framework level) so that
it calls monitor_thermal_zone() upon mode change
- modify ALL thermal drivers so that their code is prepared to return
THERMAL_DEVICE_INITIAL before they call thermal_zone_device_register(); when
the invocation of the latter completes then polling is expected to be started
- verify ALL drivers which call their own ->set_mode() to ensure they do call
monitor_thermal_zone() afterwards
- modify thermal_zone_device_update() and monitor_thermal_zone() so that they
cancel polling for disabled thermal zone devices (but not for those in
THERMAL_DEVICE_INITIAL mode)

This RFC series does all the above steps in more or less that order.

I kindly ask for comments/suggestions/improvements.

Rebased onto v5.6.

Andrzej Pietrasiewicz (8):
  thermal: int3400_thermal: Statically initialize
    .get_mode()/.set_mode() ops
  thermal: Properly handle mode values in .set_mode()
  thermal: Store thermal mode in a dedicated enum
  thermal: core: Introduce THERMAL_DEVICE_INITIAL
  thermal: core: Monitor thermal zone after mode change
  thermal: Set initial state to THERMAL_DEVICE_INITIAL
  thermal: of: Monitor thermal zone after enabling it
  thermal: Stop polling DISABLED thermal devices

 drivers/acpi/thermal.c                        | 28 +++++-----
 .../ethernet/mellanox/mlxsw/core_thermal.c    | 11 +++-
 drivers/platform/x86/acerhdf.c                | 17 ++++--
 drivers/thermal/da9062-thermal.c              |  2 +-
 drivers/thermal/imx_thermal.c                 |  5 +-
 .../intel/int340x_thermal/int3400_thermal.c   | 24 ++++-----
 .../thermal/intel/intel_quark_dts_thermal.c   |  6 ++-
 drivers/thermal/of-thermal.c                  |  9 +++-
 drivers/thermal/thermal_core.c                | 52 ++++++++++++++++++-
 drivers/thermal/thermal_core.h                |  2 +
 drivers/thermal/thermal_sysfs.c               | 12 +++--
 include/linux/thermal.h                       |  3 +-
 12 files changed, 123 insertions(+), 48 deletions(-)

-- 
2.17.1


^ permalink raw reply	[flat|nested] 143+ messages in thread