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Date: Sun, 19 Apr 2020 13:38:31 +0200
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: Andrzej Pietrasiewicz <andrzej.p@...labora.com>
Cc: linux-pm@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>, Jiri Pirko <jiri@...lanox.com>,
Ido Schimmel <idosch@...lanox.com>,
"David S . Miller" <davem@...emloft.net>,
Peter Kaestle <peter@...e.net>,
Darren Hart <dvhart@...radead.org>,
Andy Shevchenko <andy@...radead.org>,
Support Opensource <support.opensource@...semi.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amit.kucheria@...durent.com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Allison Randal <allison@...utok.net>,
Enrico Weigelt <info@...ux.net>,
Gayatri Kammela <gayatri.kammela@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-acpi@...r.kernel.org, netdev@...r.kernel.org,
platform-driver-x86@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [RFC v3 1/2] thermal: core: Let thermal zone device's mode be
stored in its struct
Hi Andrzej,
On 4/17/20 6:20 PM, Andrzej Pietrasiewicz wrote:
> Thermal zone devices' mode is stored in individual drivers. This patch
> changes it so that mode is stored in struct thermal_zone_device instead.
>
> As a result all driver-specific variables storing the mode are not needed
> and are removed. Consequently, the get_mode() implementations have nothing
> to operate on and need to be removed, too.
>
> Some thermal framework specific functions are introduced:
>
> thermal_zone_device_get_mode()
> thermal_zone_device_set_mode()
> thermal_zone_device_enable()
> thermal_zone_device_disable()
>
> thermal_zone_device_get_mode() and its "set" counterpart take tzd's lock
> and the "set" calls driver's set_mode() if provided, so the latter must
> not take this lock again. At the end of the "set"
> thermal_zone_device_update() is called so drivers don't need to repeat this
> invocation in their specific set_mode() implementations.
>
> The scope of the above 4 functions is purposedly limited to the thermal
> framework and drivers are not supposed to call them. This encapsulation
This should be true only for thermal_zone_device_{get,set}_mode().
thermal_zone_device_{en,dis}able() should be available for device drivers:
* of/thermal device drivers need to enable thermal device itself
(please refer to my patchset for details)
* device drivers need to call them on ->suspend and ->resume operations
> does not fully work at the moment for some drivers, though:
>
> - platform/x86/acerhdf.c
> - drivers/thermal/imx_thermal.c
> - drivers/thermal/intel/intel_quark_dts_thermal.c
> - drivers/thermal/of-thermal.c
>
> and they manipulate struct thermal_zone_device's members directly.
>
> struct thermal_zone_params gains a new member called initial_mode, which
> is used to set tzd's mode at registration time.
>
> The sysfs "mode" attribute is always exposed from now on, because all
> thermal zone devices now have their get_mode() implemented at the generic
> level and it is always available. Exposing "mode" doesn't hurt the drivers
> which don't provide their own set_mode(), because writing to "mode" will
> result in -EPERM, as expected.
>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>
> ---
> drivers/acpi/thermal.c | 46 +++++----------
> .../ethernet/mellanox/mlxsw/core_thermal.c | 57 ++++---------------
> drivers/platform/x86/acerhdf.c | 17 +-----
> drivers/thermal/da9062-thermal.c | 16 ++----
> drivers/thermal/imx_thermal.c | 29 +++-------
> .../intel/int340x_thermal/int3400_thermal.c | 30 ++--------
> .../thermal/intel/intel_quark_dts_thermal.c | 22 ++-----
> drivers/thermal/of-thermal.c | 30 +++-------
> drivers/thermal/thermal_core.c | 44 +++++++++++++-
> drivers/thermal/thermal_core.h | 16 ++++++
> drivers/thermal/thermal_sysfs.c | 29 +---------
> include/linux/thermal.h | 7 ++-
> 12 files changed, 125 insertions(+), 218 deletions(-)
>
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index 19067a5e5293..67bc263332a5 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;
> - int tz_enabled;
> 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->tz_enabled)
> + if (tz->thermal_zone->mode != THERMAL_DEVICE_ENABLED)
> return;
>
> thermal_zone_device_update(tz->thermal_zone,
> @@ -526,46 +525,29 @@ static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
> return 0;
> }
>
> -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->tz_enabled ? THERMAL_DEVICE_ENABLED :
> - THERMAL_DEVICE_DISABLED;
> -
> - return 0;
> -}
> -
> static int thermal_set_mode(struct thermal_zone_device *thermal,
> enum thermal_device_mode mode)
> {
> struct acpi_thermal *tz = thermal->devdata;
> - int enable;
>
> if (!tz)
> return -EINVAL;
>
> + if (mode != THERMAL_DEVICE_DISABLED &&
> + mode != THERMAL_DEVICE_ENABLED)
> + return -EINVAL;
These checks should be removed as they are already done in the caller
of ->set_mode method (thermal_zone_device_set_mode()).
> +
> /*
> * enable/disable thermal management from ACPI thermal driver
> */
> - if (mode == THERMAL_DEVICE_ENABLED)
> - enable = 1;
> - else if (mode == THERMAL_DEVICE_DISABLED) {
> - enable = 0;
> + if (mode == THERMAL_DEVICE_DISABLED)
> pr_warn("thermal zone will be disabled\n");
> - } else
> - return -EINVAL;
>
> - if (enable != tz->tz_enabled) {
> - tz->tz_enabled = enable;
> + if (mode != thermal->mode) {
> ACPI_DEBUG_PRINT((ACPI_DB_INFO,
> "%s kernel ACPI thermal control\n",
> - tz->tz_enabled ? "Enable" : "Disable"));
> - acpi_thermal_check(tz);
> + mode == THERMAL_DEVICE_ENABLED ?
> + "Enable" : "Disable"));
> }
> return 0;
> }
> @@ -856,7 +838,6 @@ static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
> .bind = acpi_thermal_bind_cooling_device,
> .unbind = acpi_thermal_unbind_cooling_device,
> .get_temp = thermal_get_temp,
> - .get_mode = thermal_get_mode,
> .set_mode = thermal_set_mode,
> .get_trip_type = thermal_get_trip_type,
> .get_trip_temp = thermal_get_trip_temp,
> @@ -870,6 +851,9 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
> int trips = 0;
> int result;
> acpi_status status;
> + struct thermal_zone_params prms = {
> + .initial_mode = THERMAL_DEVICE_ENABLED,
> + };
> int i;
>
> if (tz->trips.critical.flags.valid)
> @@ -887,13 +871,13 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
> if (tz->trips.passive.flags.valid)
> tz->thermal_zone =
> thermal_zone_device_register("acpitz", trips, 0, tz,
> - &acpi_thermal_zone_ops, NULL,
> + &acpi_thermal_zone_ops, &prms,
> tz->trips.passive.tsp*100,
> tz->polling_frequency*100);
> else
> tz->thermal_zone =
> thermal_zone_device_register("acpitz", trips, 0, tz,
> - &acpi_thermal_zone_ops, NULL,
> + &acpi_thermal_zone_ops, &prms,
> 0, tz->polling_frequency*100);
> if (IS_ERR(tz->thermal_zone))
> return -ENODEV;
> @@ -913,8 +897,6 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
> if (ACPI_FAILURE(status))
> return -ENODEV;
>
> - tz->tz_enabled = 1;
> -
> dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
> tz->thermal_zone->id);
> return 0;
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
> index ce0a6837daa3..50518048b86d 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;
> @@ -277,33 +275,16 @@ static int mlxsw_thermal_unbind(struct thermal_zone_device *tzdev,
> return 0;
> }
>
> -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;
> -
> - return 0;
> -}
> -
> static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
> enum thermal_device_mode mode)
> {
> struct mlxsw_thermal *thermal = tzdev->devdata;
>
> - mutex_lock(&tzdev->lock);
> -
> if (mode == THERMAL_DEVICE_ENABLED)
> tzdev->polling_delay = thermal->polling_delay;
> else
> tzdev->polling_delay = 0;
>
> - mutex_unlock(&tzdev->lock);
> -
> - thermal->mode = mode;
> - thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
> -
> return 0;
> }
>
> @@ -407,7 +388,6 @@ static int mlxsw_thermal_trend_get(struct thermal_zone_device *tzdev,
> static struct thermal_zone_device_ops mlxsw_thermal_ops = {
> .bind = mlxsw_thermal_bind,
> .unbind = mlxsw_thermal_unbind,
> - .get_mode = mlxsw_thermal_get_mode,
> .set_mode = mlxsw_thermal_set_mode,
> .get_temp = mlxsw_thermal_get_temp,
> .get_trip_type = mlxsw_thermal_get_trip_type,
> @@ -466,34 +446,17 @@ static int mlxsw_thermal_module_unbind(struct thermal_zone_device *tzdev,
> return err;
> }
>
> -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;
> -
> - return 0;
> -}
> -
> static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
> enum thermal_device_mode mode)
> {
> struct mlxsw_thermal_module *tz = tzdev->devdata;
> struct mlxsw_thermal *thermal = tz->parent;
>
> - mutex_lock(&tzdev->lock);
> -
> if (mode == THERMAL_DEVICE_ENABLED)
> tzdev->polling_delay = thermal->polling_delay;
> else
> tzdev->polling_delay = 0;
>
> - mutex_unlock(&tzdev->lock);
> -
> - tz->mode = mode;
> - thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
> -
> return 0;
> }
>
> @@ -596,7 +559,6 @@ mlxsw_thermal_module_trip_hyst_set(struct thermal_zone_device *tzdev, int trip,
> static struct thermal_zone_device_ops mlxsw_thermal_module_ops = {
> .bind = mlxsw_thermal_module_bind,
> .unbind = mlxsw_thermal_module_unbind,
> - .get_mode = mlxsw_thermal_module_mode_get,
> .set_mode = mlxsw_thermal_module_mode_set,
> .get_temp = mlxsw_thermal_module_temp_get,
> .get_trip_type = mlxsw_thermal_module_trip_type_get,
> @@ -635,7 +597,6 @@ static int mlxsw_thermal_gearbox_temp_get(struct thermal_zone_device *tzdev,
> static struct thermal_zone_device_ops mlxsw_thermal_gearbox_ops = {
> .bind = mlxsw_thermal_module_bind,
> .unbind = mlxsw_thermal_module_unbind,
> - .get_mode = mlxsw_thermal_module_mode_get,
> .set_mode = mlxsw_thermal_module_mode_set,
> .get_temp = mlxsw_thermal_gearbox_temp_get,
> .get_trip_type = mlxsw_thermal_module_trip_type_get,
> @@ -749,6 +710,9 @@ static const struct thermal_cooling_device_ops mlxsw_cooling_ops = {
> static int
> mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
> {
> + struct thermal_zone_params tzp = {
> + .initial_mode = THERMAL_DEVICE_ENABLED,
> + };
> char tz_name[MLXSW_THERMAL_ZONE_MAX_NAME];
> int err;
>
> @@ -759,13 +723,12 @@ mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
> MLXSW_THERMAL_TRIP_MASK,
> module_tz,
> &mlxsw_thermal_module_ops,
> - NULL, 0, 0);
> + &tzp, 0, 0);
> if (IS_ERR(module_tz->tzdev)) {
> err = PTR_ERR(module_tz->tzdev);
> return err;
> }
>
> - module_tz->mode = THERMAL_DEVICE_ENABLED;
> return 0;
> }
>
> @@ -868,6 +831,9 @@ mlxsw_thermal_modules_fini(struct mlxsw_thermal *thermal)
> static int
> mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
> {
> + struct thermal_zone_params tzp = {
> + .initial_mode = THERMAL_DEVICE_ENABLED,
> + };
> char tz_name[MLXSW_THERMAL_ZONE_MAX_NAME];
>
> snprintf(tz_name, sizeof(tz_name), "mlxsw-gearbox%d",
> @@ -877,11 +843,10 @@ mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
> MLXSW_THERMAL_TRIP_MASK,
> gearbox_tz,
> &mlxsw_thermal_gearbox_ops,
> - NULL, 0, 0);
> + &tzp, 0, 0);
> if (IS_ERR(gearbox_tz->tzdev))
> return PTR_ERR(gearbox_tz->tzdev);
>
> - gearbox_tz->mode = THERMAL_DEVICE_ENABLED;
> return 0;
> }
>
> @@ -960,6 +925,9 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
> const struct mlxsw_bus_info *bus_info,
> struct mlxsw_thermal **p_thermal)
> {
> + struct thermal_zone_params tzp = {
> + .initial_mode = THERMAL_DEVICE_ENABLED,
> + };
> char mfcr_pl[MLXSW_REG_MFCR_LEN] = { 0 };
> enum mlxsw_reg_mfcr_pwm_frequency freq;
> struct device *dev = bus_info->dev;
> @@ -1034,7 +1002,7 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
> MLXSW_THERMAL_TRIP_MASK,
> thermal,
> &mlxsw_thermal_ops,
> - NULL, 0,
> + &tzp, 0,
> thermal->polling_delay);
> if (IS_ERR(thermal->tzdev)) {
> err = PTR_ERR(thermal->tzdev);
> @@ -1050,7 +1018,6 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
> if (err)
> goto err_unreg_modules_tzdev;
>
> - thermal->mode = THERMAL_DEVICE_ENABLED;
> *p_thermal = thermal;
> return 0;
>
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 8cc86f4e3ac1..aaf8b845be90 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -406,22 +406,9 @@ static inline void acerhdf_enable_kernelmode(void)
> kernelmode = 1;
>
> thz_dev->polling_delay = interval*1000;
> - thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
> pr_notice("kernel mode fan control ON\n");
> }
>
> -static int acerhdf_get_mode(struct thermal_zone_device *thermal,
> - enum thermal_device_mode *mode)
> -{
> - if (verbose)
> - pr_notice("kernel mode fan control %d\n", kernelmode);
> -
> - *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED
> - : THERMAL_DEVICE_DISABLED;
> -
> - return 0;
> -}
> -
> /*
> * set operation mode;
> * enabled: the thermal layer of the kernel takes care about
> @@ -488,7 +475,6 @@ static struct thermal_zone_device_ops acerhdf_dev_ops = {
> .bind = acerhdf_bind,
> .unbind = acerhdf_unbind,
> .get_temp = acerhdf_get_ec_temp,
> - .get_mode = acerhdf_get_mode,
> .set_mode = acerhdf_set_mode,
> .get_trip_type = acerhdf_get_trip_type,
> .get_trip_hyst = acerhdf_get_trip_hyst,
> @@ -554,6 +540,7 @@ static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
>
> err_out:
> acerhdf_revert_to_bios_mode();
> + thz_dev->mode = THERMAL_DEVICE_DISABLED;
> return -EINVAL;
> }
>
> @@ -739,6 +726,8 @@ static int __init acerhdf_register_thermal(void)
> if (IS_ERR(cl_dev))
> return -EINVAL;
>
> + acerhdf_zone_params.initial_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,
> diff --git a/drivers/thermal/da9062-thermal.c b/drivers/thermal/da9062-thermal.c
> index c32709badeda..4bdb6f9621c1 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;
> @@ -121,14 +120,6 @@ static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
> return IRQ_HANDLED;
> }
>
> -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;
> - return 0;
> -}
> -
> static int da9062_thermal_get_trip_type(struct thermal_zone_device *z,
> int trip,
> enum thermal_trip_type *type)
> @@ -181,7 +172,6 @@ static int da9062_thermal_get_temp(struct thermal_zone_device *z,
>
> static struct thermal_zone_device_ops da9062_thermal_ops = {
> .get_temp = da9062_thermal_get_temp,
> - .get_mode = da9062_thermal_get_mode,
> .get_trip_type = da9062_thermal_get_trip_type,
> .get_trip_temp = da9062_thermal_get_trip_temp,
> };
> @@ -199,6 +189,9 @@ MODULE_DEVICE_TABLE(of, da9062_compatible_reg_id_table);
>
> static int da9062_thermal_probe(struct platform_device *pdev)
> {
> + struct thermal_zone_params tzp = {
> + .initial_mode = THERMAL_DEVICE_ENABLED,
> + };
> struct da9062 *chip = dev_get_drvdata(pdev->dev.parent);
> struct da9062_thermal *thermal;
> unsigned int pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD;
> @@ -233,7 +226,6 @@ 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);
> @@ -241,7 +233,7 @@ static int da9062_thermal_probe(struct platform_device *pdev)
>
> thermal->zone = thermal_zone_device_register(thermal->config->name,
> 1, 0, thermal,
> - &da9062_thermal_ops, NULL, pp_tmp,
> + &da9062_thermal_ops, &tzp, pp_tmp,
> 0);
> if (IS_ERR(thermal->zone)) {
> dev_err(&pdev->dev, "Cannot register thermal zone device\n");
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index e761c9b42217..3e02323c938b 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,
> @@ -331,16 +330,6 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
> return 0;
> }
>
> -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;
> -
> - return 0;
> -}
> -
> static int imx_set_mode(struct thermal_zone_device *tz,
> enum thermal_device_mode mode)
> {
> @@ -376,9 +365,6 @@ static int imx_set_mode(struct thermal_zone_device *tz,
> }
> }
>
> - data->mode = mode;
> - thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
> -
> return 0;
> }
>
> @@ -467,7 +453,6 @@ static struct thermal_zone_device_ops imx_tz_ops = {
> .bind = imx_bind,
> .unbind = imx_unbind,
> .get_temp = imx_get_temp,
> - .get_mode = imx_get_mode,
> .set_mode = imx_set_mode,
> .get_trip_type = imx_get_trip_type,
> .get_trip_temp = imx_get_trip_temp,
> @@ -691,6 +676,9 @@ static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data
>
> static int imx_thermal_probe(struct platform_device *pdev)
> {
> + struct thermal_zone_params tzp = {
> + .initial_mode = THERMAL_DEVICE_ENABLED,
> + };
> struct imx_thermal_data *data;
> struct regmap *map;
> int measure_freq;
> @@ -799,7 +787,7 @@ static int imx_thermal_probe(struct platform_device *pdev)
> data->tz = thermal_zone_device_register("imx_thermal_zone",
> IMX_TRIP_NUM,
> BIT(IMX_TRIP_PASSIVE), data,
> - &imx_tz_ops, NULL,
> + &imx_tz_ops, &tzp,
> IMX_PASSIVE_DELAY,
> IMX_POLLING_DELAY);
> if (IS_ERR(data->tz)) {
> @@ -831,7 +819,6 @@ static int imx_thermal_probe(struct platform_device *pdev)
> data->socdata->measure_temp_mask);
>
> data->irq_enabled = true;
> - data->mode = THERMAL_DEVICE_ENABLED;
>
> ret = devm_request_threaded_irq(&pdev->dev, data->irq,
> imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
> @@ -885,7 +872,7 @@ 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 +892,7 @@ 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 e802922a13cf..86a00598ed09 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -44,7 +44,6 @@ static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
> struct int3400_thermal_priv {
> struct acpi_device *adev;
> struct thermal_zone_device *thermal;
> - int mode;
> int art_count;
> struct art *arts;
> int trt_count;
> @@ -230,48 +229,29 @@ static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
> return 0;
> }
>
> -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;
> -
> - return 0;
> -}
> -
> static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
> enum thermal_device_mode mode)
> {
> struct int3400_thermal_priv *priv = thermal->devdata;
> - bool enable;
> int result = 0;
>
> if (!priv)
> return -EINVAL;
>
> - if (mode == THERMAL_DEVICE_ENABLED)
> - enable = true;
> - else if (mode == THERMAL_DEVICE_DISABLED)
> - enable = false;
> - else
> + if (mode != THERMAL_DEVICE_ENABLED &&
> + mode != THERMAL_DEVICE_DISABLED)
> return -EINVAL;
These checks should be removed as they are already done in the caller
of ->set_mode method (thermal_zone_device_set_mode()).
> - if (enable != priv->mode) {
> - priv->mode = enable;
> + if (mode != thermal->mode) {
> result = int3400_thermal_run_osc(priv->adev->handle,
> - priv->current_uuid_index,
> - enable);
> + priv->current_uuid_index,
> + mode == THERMAL_DEVICE_ENABLED);
> }
> return result;
> }
>
> static struct thermal_zone_device_ops int3400_thermal_ops = {
> .get_temp = int3400_thermal_get_temp,
> - .get_mode = int3400_thermal_get_mode,
> .set_mode = int3400_thermal_set_mode,
> };
>
> diff --git a/drivers/thermal/intel/intel_quark_dts_thermal.c b/drivers/thermal/intel/intel_quark_dts_thermal.c
> index d704fc104cfd..c4879b4bfbf1 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;
> }
> @@ -309,14 +308,6 @@ static int sys_get_curr_temp(struct thermal_zone_device *tzd,
> return 0;
> }
>
> -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;
> - return 0;
> -}
> -
> static int sys_set_mode(struct thermal_zone_device *tzd,
> enum thermal_device_mode mode)
> {
> @@ -338,7 +329,6 @@ static struct thermal_zone_device_ops tzone_ops = {
> .get_trip_type = sys_get_trip_type,
> .set_trip_temp = sys_set_trip_temp,
> .get_crit_temp = sys_get_crit_temp,
> - .get_mode = sys_get_mode,
> .set_mode = sys_set_mode,
> };
>
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index 874a47d6923f..863b89546f81 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.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;
> @@ -269,23 +267,11 @@ static int of_thermal_unbind(struct thermal_zone_device *thermal,
> return 0;
> }
>
> -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;
> -
> - return 0;
> -}
> -
> static int of_thermal_set_mode(struct thermal_zone_device *tz,
> enum thermal_device_mode mode)
> {
> struct __thermal_zone *data = tz->devdata;
>
> - mutex_lock(&tz->lock);
> -
> if (mode == THERMAL_DEVICE_ENABLED) {
> tz->polling_delay = data->polling_delay;
> tz->passive_delay = data->passive_delay;
> @@ -294,11 +280,6 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
> tz->passive_delay = 0;
> }
>
> - mutex_unlock(&tz->lock);
> -
> - data->mode = mode;
> - thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
> -
> return 0;
> }
>
> @@ -393,7 +374,6 @@ static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
> }
>
> static struct thermal_zone_device_ops of_thermal_ops = {
> - .get_mode = of_thermal_get_mode,
> .set_mode = of_thermal_set_mode,
>
> .get_trip_type = of_thermal_get_trip_type,
> @@ -553,8 +533,14 @@ thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data,
> if (id == sensor_id) {
> tzd = thermal_zone_of_add_sensor(child, sensor_np,
> data, ops);
> - if (!IS_ERR(tzd))
> + if (!IS_ERR(tzd)) {
> + mutex_lock(&tzd->lock);
> tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED);
> + tzd->mode = THERMAL_DEVICE_ENABLED;
> + mutex_unlock(&tzd->lock);
> + thermal_zone_device_update(tzd,
> + THERMAL_EVENT_UNSPECIFIED);
> + }
This should use thermal_zone_device_enable() instead of open-coding it:
if (!IS_ERR(tzd))
thermal_zone_device_enable(tzd);
Also because of of_thermal_set_mode() modifications following of/thermal
device drivers (which use ->set_mode directly):
drivers/thermal/hisi_thermal.c: tzd->ops->set_mode(tzd,
drivers/thermal/rockchip_thermal.c: tzd->ops->set_mode(tzd,
drivers/thermal/sprd_thermal.c: tzd->ops->set_mode(tzd,
need to be converted to use thermal_zone_device_{en,dis}able() instead.
> of_node_put(child);
> goto exit;
> @@ -979,7 +965,6 @@ __init *thermal_of_build_thermal_zone(struct device_node *np)
>
> finish:
> of_node_put(child);
> - tz->mode = THERMAL_DEVICE_DISABLED;
>
> return tz;
>
> @@ -1120,6 +1105,7 @@ int __init of_parse_thermal_zones(void)
> /* these two are left for temperature drivers to use */
> tzp->slope = tz->slope;
> tzp->offset = tz->offset;
> + tzp->initial_mode = THERMAL_DEVICE_DISABLED;
>
> zone = thermal_zone_device_register(child->name, tz->ntrips,
> mask, tz,
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index c06550930979..5ff98fcc0f6a 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -463,6 +463,43 @@ static void thermal_zone_device_reset(struct thermal_zone_device *tz)
> thermal_zone_device_init(tz);
> }
>
> +enum thermal_device_mode
> +thermal_zone_device_get_mode(struct thermal_zone_device *tz)
> +{
> + enum thermal_device_mode mode;
> +
> + mutex_lock(&tz->lock);
> +
> + mode = tz->mode;
> +
> + mutex_unlock(&tz->lock);
> +
> + return mode;
> +}
> +
> +int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
> + enum thermal_device_mode mode)
> +{
> + int ret = 0;
> +
> + if (mode != THERMAL_DEVICE_DISABLED &&
> + mode != THERMAL_DEVICE_ENABLED)
> + return -EINVAL;
No need for these checks as enum thermal_device_mode has only two
possible values (we don't do "defensive coding" in the kernel).
> + mutex_lock(&tz->lock);
> +
> + if (tz->ops->set_mode)
> + ret = tz->ops->set_mode(tz, mode);
> +
> + tz->mode = mode;
> +
> + mutex_unlock(&tz->lock);
> +
> + thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
> +
> + return ret;
> +}
Please add:
EXPORT_SYMBOL_GPL(thermal_zone_device_set_mode);
here so device drivers can use thermal_zone_device_{en,dis}able().
> void thermal_zone_device_update(struct thermal_zone_device *tz,
> enum thermal_notify_event event)
> {
> @@ -1344,6 +1381,9 @@ 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);
>
> + if (tzp)
> + thermal_zone_device_set_mode(tz, tzp->initial_mode);
Please note that currently some device drivers don't access ->mode
at all so their default ->mode value is THERMAL_DEVICE_DISABLED but
in reality they are enabled (IOW after changes in this patch they
should default to THERMAL_DEVICE_ENABLED to reflect real device state
in "mode" sysfs attribue and not break after applying patch #2).
Therefore we should always call thermal_zone_device_set_mode() and
use the default value of THERMAL_DEVICE_ENABLED if tzp is NULL:
mode = tzp ? tzp->initial_mode : THERMAL_DEVICE_ENABLED;
thermal_zone_device_set_mode(tz, mode);
This would also simplify the patch further:
* setting tz->need_update and calling thermal_zone_device_update()
directly can be removed from thermal_zone_device_register()
* tzp-s with only .initial_mode = THERMAL_DEVICE_ENABLED set can
be removed from:
drivers/thermal/acpi.c
drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
drivers/thermal/da9062-thermal.c
drivers/thermal/imx_thermal.c
The rest of the patch looks fine, thank you for working on this!
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
> +
> return tz;
>
> unregister:
> @@ -1473,9 +1513,7 @@ static int thermal_pm_notify(struct notifier_block *nb,
> case PM_POST_SUSPEND:
> atomic_set(&in_suspend, 0);
> list_for_each_entry(tz, &thermal_tz_list, node) {
> - tz_mode = THERMAL_DEVICE_ENABLED;
> - if (tz->ops->get_mode)
> - tz->ops->get_mode(tz, &tz_mode);
> + tz_mode = thermal_zone_device_get_mode(tz);
>
> if (tz_mode == THERMAL_DEVICE_DISABLED)
> continue;
> diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
> index c95689586e19..8e561bac3133 100644
> --- a/drivers/thermal/thermal_core.h
> +++ b/drivers/thermal/thermal_core.h
> @@ -141,6 +141,22 @@ thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
> unsigned long new_state) {}
> #endif /* CONFIG_THERMAL_STATISTICS */
>
> +enum thermal_device_mode
> +thermal_zone_device_get_mode(struct thermal_zone_device *tz);
> +
> +int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
> + enum thermal_device_mode mode);
> +
> +static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
> +{
> + return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_ENABLED);
> +}
> +
> +static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
> +{
> + return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED);
> +}
> +
> /* device tree support */
> #ifdef CONFIG_THERMAL_OF
> int of_parse_thermal_zones(void);
> diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
> index aa99edb4dff7..cbb27b3c96d2 100644
> --- a/drivers/thermal/thermal_sysfs.c
> +++ b/drivers/thermal/thermal_sysfs.c
> @@ -50,14 +50,8 @@ mode_show(struct device *dev, struct device_attribute *attr, char *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> enum thermal_device_mode mode;
> - int result;
> -
> - if (!tz->ops->get_mode)
> - return -EPERM;
>
> - result = tz->ops->get_mode(tz, &mode);
> - if (result)
> - return result;
> + mode = thermal_zone_device_get_mode(tz);
>
> return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
> : "disabled");
> @@ -74,9 +68,9 @@ mode_store(struct device *dev, struct device_attribute *attr,
> return -EPERM;
>
> if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
> - result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
> + result = thermal_zone_device_enable(tz);
> else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
> - result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
> + result = thermal_zone_device_disable(tz);
> else
> result = -EINVAL;
>
> @@ -428,30 +422,13 @@ static struct attribute_group thermal_zone_attribute_group = {
> .attrs = thermal_zone_dev_attrs,
> };
>
> -/* We expose mode only if .get_mode is present */
> static struct attribute *thermal_zone_mode_attrs[] = {
> &dev_attr_mode.attr,
> NULL,
> };
>
> -static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
> - struct attribute *attr,
> - int attrno)
> -{
> - struct device *dev = container_of(kobj, struct device, kobj);
> - struct thermal_zone_device *tz;
> -
> - tz = container_of(dev, struct thermal_zone_device, device);
> -
> - if (tz->ops->get_mode)
> - return attr->mode;
> -
> - return 0;
> -}
> -
> static struct attribute_group thermal_zone_mode_attribute_group = {
> .attrs = thermal_zone_mode_attrs,
> - .is_visible = thermal_zone_mode_is_visible,
> };
>
> /* We expose passive only if passive trips are present */
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 216185bb3014..da4141697e2e 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -76,8 +76,6 @@ struct thermal_zone_device_ops {
> struct thermal_cooling_device *);
> int (*get_temp) (struct thermal_zone_device *, int *);
> int (*set_trips) (struct thermal_zone_device *, int, int);
> - int (*get_mode) (struct thermal_zone_device *,
> - enum thermal_device_mode *);
> int (*set_mode) (struct thermal_zone_device *,
> enum thermal_device_mode);
> int (*get_trip_type) (struct thermal_zone_device *, int,
> @@ -128,6 +126,7 @@ struct thermal_cooling_device {
> * @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
> * @trip_type_attrs: attributes for trip points for sysfs: trip type
> * @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
> + * @mode: current mode of this thermal zone
> * @devdata: private pointer for device private data
> * @trips: number of trip points the thermal zone supports
> * @trips_disabled; bitmap for disabled trips
> @@ -170,6 +169,7 @@ struct thermal_zone_device {
> struct thermal_attr *trip_temp_attrs;
> struct thermal_attr *trip_type_attrs;
> struct thermal_attr *trip_hyst_attrs;
> + enum thermal_device_mode mode;
> void *devdata;
> int trips;
> unsigned long trips_disabled; /* bitmap for disabled trips */
> @@ -264,6 +264,9 @@ struct thermal_zone_params {
> int num_tbps; /* Number of tbp entries */
> struct thermal_bind_params *tbp;
>
> + /* Initial mode of this thermal zone device */
> + enum thermal_device_mode initial_mode;
> +
> /*
> * Sustainable power (heat) that this thermal zone can dissipate in
> * mW
>
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