/* * linux/drivers/thermal/gpu_cooling.c * * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com) * Copyright (C) 2012 Amit Daniel * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include #include #include #include #include #include #include #include #include "samsung/exynos_tmu.h" /** * struct power_table - frequency to power conversion * @frequency: frequency in KHz * @power: power in mW * * This structure is built when the cooling device registers and helps * in translating frequency to power and viceversa. */ struct power_table { u32 frequency; u32 power; }; /** * struct gpufreq_cooling_device - data for cooling device with gpufreq * @id: unique integer value corresponding to each gpufreq_cooling_device * registered. * @cool_dev: thermal_cooling_device pointer to keep track of the * registered cooling device. * @gpufreq_state: integer value representing the current state of gpufreq * cooling devices. * @gpufreq_val: integer value representing the absolute value of the clipped * frequency. * * This structure is required for keeping information of each * gpufreq_cooling_device registered. In order to prevent corruption of this a * mutex lock cooling_gpu_lock is used. */ struct gpufreq_cooling_device { int id; struct thermal_cooling_device *cool_dev; unsigned long gpufreq_state; unsigned int gpufreq_val; u32 last_load; struct power_table *dyn_power_table; int dyn_power_table_entries; int *var_table; int *var_coeff; int *asv_coeff; unsigned int var_volt_size; unsigned int var_temp_size; }; static DEFINE_IDR(gpufreq_idr); static DEFINE_MUTEX(cooling_gpu_lock); static BLOCKING_NOTIFIER_HEAD(gpu_notifier); static unsigned int gpufreq_cdev_count; struct cpufreq_frequency_table *gpu_freq_table; /** * get_idr - function to get a unique id. * @idr: struct idr * handle used to create a id. * @id: int * value generated by this function. * * This function will populate @id with an unique * id, using the idr API. * * Return: 0 on success, an error code on failure. */ static int get_idr(struct idr *idr, int *id) { int ret; mutex_lock(&cooling_gpu_lock); ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL); mutex_unlock(&cooling_gpu_lock); if (unlikely(ret < 0)) return ret; *id = ret; return 0; } /** * release_idr - function to free the unique id. * @idr: struct idr * handle used for creating the id. * @id: int value representing the unique id. */ static void release_idr(struct idr *idr, int id) { mutex_lock(&cooling_gpu_lock); idr_remove(idr, id); mutex_unlock(&cooling_gpu_lock); } /* Below code defines functions to be used for gpufreq as cooling device */ enum gpufreq_cooling_property { GET_LEVEL, GET_FREQ, GET_MAXL, }; /** * get_property - fetch a property of interest for a give gpu. * @gpu: gpu for which the property is required * @input: query parameter * @output: query return * @property: type of query (frequency, level, max level) * * This is the common function to * 1. get maximum gpu cooling states * 2. translate frequency to cooling state * 3. translate cooling state to frequency * Note that the code may be not in good shape * but it is written in this way in order to: * a) reduce duplicate code as most of the code can be shared. * b) make sure the logic is consistent when translating between * cooling states and frequencies. * * Return: 0 on success, -EINVAL when invalid parameters are passed. */ static int get_property(unsigned int gpu, unsigned long input, unsigned int *output, enum gpufreq_cooling_property property) { int i; unsigned long max_level = 0, level = 0; unsigned int freq = CPUFREQ_ENTRY_INVALID; int descend = -1; struct cpufreq_frequency_table *pos, *table = gpu_freq_table; if (!output) return -EINVAL; cpufreq_for_each_valid_entry(pos, table) { /* ignore duplicate entry */ if (freq == pos->frequency) continue; /* get the frequency order */ if (freq != CPUFREQ_ENTRY_INVALID && descend == -1) descend = freq > pos->frequency; freq = pos->frequency; max_level++; } /* No valid cpu frequency entry */ if (max_level == 0) return -EINVAL; /* max_level is an index, not a counter */ max_level--; /* get max level */ if (property == GET_MAXL) { *output = (unsigned int)max_level; return 0; } if (property == GET_FREQ) level = descend ? input : (max_level - input); i = 0; cpufreq_for_each_valid_entry(pos, table) { /* ignore duplicate entry */ if (freq == pos->frequency) continue; /* now we have a valid frequency entry */ freq = pos->frequency; if (property == GET_LEVEL && (unsigned int)input == freq) { /* get level by frequency */ *output = (unsigned int)(descend ? i : (max_level - i)); return 0; } if (property == GET_FREQ && level == i) { /* get frequency by level */ *output = freq; return 0; } i++; } return -EINVAL; } /** * gpufreq_cooling_get_level - for a give gpu, return the cooling level. * @gpu: gpu for which the level is required * @freq: the frequency of interest * * This function will match the cooling level corresponding to the * requested @freq and return it. * * Return: The matched cooling level on success or THERMAL_CSTATE_INVALID * otherwise. */ unsigned long gpufreq_cooling_get_level(unsigned int gpu, unsigned int freq) { unsigned int val; if (get_property(gpu, (unsigned long)freq, &val, GET_LEVEL)) return THERMAL_CSTATE_INVALID; return (unsigned long)val; } EXPORT_SYMBOL_GPL(gpufreq_cooling_get_level); /** * gpufreq_cooling_get_freq - for a give gpu, return the cooling frequency. * @gpu: gpu for which the level is required * @level: the level of interest * * This function will match the cooling level corresponding to the * requested @freq and return it. * * Return: The matched cooling level on success or THERMAL_CFREQ_INVALID * otherwise. */ static u32 gpufreq_cooling_get_freq(unsigned int gpu, unsigned long level) { unsigned int val = 0; if (get_property(gpu, level, &val, GET_FREQ)) return THERMAL_CFREQ_INVALID; return val; } EXPORT_SYMBOL_GPL(gpufreq_cooling_get_freq); /** * build_dyn_power_table() - create a dynamic power to frequency table * @gpufreq_cdev: the gpufreq cooling device in which to store the table * @capacitance: dynamic power coefficient for these gpus * * Build a dynamic power to frequency table for this gpu and store it * in @gpufreq_cdev. This table will be used in gpu_power_to_freq() and * gpu_freq_to_power() to convert between power and frequency * efficiently. Power is stored in mW, frequency in KHz. The * resulting table is in ascending order. * * Return: 0 on success, -EINVAL if there are no OPPs for any CPUs, * -ENOMEM if we run out of memory or -EAGAIN if an OPP was * added/enabled while the function was executing. */ static int build_dyn_power_table(struct gpufreq_cooling_device *gpufreq_cdev, u32 capacitance) { struct power_table *power_table; int num_opps = 0, i, cnt = 0; unsigned long freq; num_opps = gpu_dvfs_get_step(); if (num_opps == 0) return -EINVAL; power_table = kcalloc(num_opps, sizeof(*power_table), GFP_KERNEL); if (!power_table) return -ENOMEM; for (freq = 0, i = 0; i < num_opps; i++) { u32 voltage_mv; u64 power; freq = gpu_dvfs_get_clock(num_opps - i - 1); if (freq > gpu_dvfs_get_max_freq() || freq == 0) continue; voltage_mv = gpu_dvfs_get_voltage(freq) / 1000; /* * Do the multiplication with MHz and millivolt so as * to not overflow. */ power = (u64)capacitance * (freq / 1000) * voltage_mv * voltage_mv; do_div(power, 1000000000); power_table[i].frequency = (unsigned int)freq; /* power is stored in mW */ power_table[i].power = power; cnt++; } gpufreq_cdev->dyn_power_table = power_table; gpufreq_cdev->dyn_power_table_entries = cnt; return 0; } static int build_static_power_table(struct device_node *np, struct gpufreq_cooling_device *gpufreq_cdev) { int i, j; int ratio = 0, asv_group = 0, cal_id = 0, ret = 0; void *gen_block; struct ect_gen_param_table *volt_temp_param, *asv_param; int ratio_table[16] = { 0, 25, 29, 35, 41, 48, 57, 67, 79, 94, 110, 130, 151, 162, 162, 162}; ret = of_property_read_u32(np, "g3d_cmu_cal_id", &cal_id); if (ret) { pr_err("%s: Failed to get cal-id\n", __func__); return -EINVAL; } ratio = cal_asv_get_ids_info(cal_id); asv_group = cal_asv_get_grp(cal_id); if (asv_group < 0 || asv_group > 15) asv_group = 0; if (!ratio) ratio = ratio_table[asv_group]; gen_block = ect_get_block("GEN"); if (gen_block == NULL) { pr_err("%s: Failed to get gen block from ECT\n", __func__); return -EINVAL; } volt_temp_param = ect_gen_param_get_table(gen_block, "DTM_G3D_VOLT_TEMP"); asv_param = ect_gen_param_get_table(gen_block, "DTM_G3D_ASV"); if (volt_temp_param && asv_param) { gpufreq_cdev->var_volt_size = volt_temp_param->num_of_row - 1; gpufreq_cdev->var_temp_size = volt_temp_param->num_of_col - 1; gpufreq_cdev->var_coeff = kzalloc(sizeof(int) * volt_temp_param->num_of_row * volt_temp_param->num_of_col, GFP_KERNEL); if (!gpufreq_cdev->var_coeff) goto err_mem; gpufreq_cdev->asv_coeff = kzalloc(sizeof(int) * asv_param->num_of_row * asv_param->num_of_col, GFP_KERNEL); if (!gpufreq_cdev->asv_coeff) goto free_var_coeff; gpufreq_cdev->var_table = kzalloc(sizeof(int) * volt_temp_param->num_of_row * volt_temp_param->num_of_col, GFP_KERNEL); if (!gpufreq_cdev->var_table) goto free_asv_coeff; memcpy(gpufreq_cdev->var_coeff, volt_temp_param->parameter, sizeof(int) * volt_temp_param->num_of_row * volt_temp_param->num_of_col); memcpy(gpufreq_cdev->asv_coeff, asv_param->parameter, sizeof(int) * asv_param->num_of_row * asv_param->num_of_col); memcpy(gpufreq_cdev->var_table, volt_temp_param->parameter, sizeof(int) * volt_temp_param->num_of_row * volt_temp_param->num_of_col); } else { pr_err("%s: Failed to get param table from ECT\n", __func__); return -EINVAL; } for (i = 1; i <= gpufreq_cdev->var_volt_size; i++) { long asv_coeff = (long)gpufreq_cdev->asv_coeff[3 * i + 0] * asv_group * asv_group + (long)gpufreq_cdev->asv_coeff[3 * i + 1] * asv_group + (long)gpufreq_cdev->asv_coeff[3 * i + 2]; asv_coeff = asv_coeff / 100; for (j = 1; j <= gpufreq_cdev->var_temp_size; j++) { long var_coeff = (long)gpufreq_cdev->var_coeff[i * (gpufreq_cdev->var_temp_size + 1) + j]; var_coeff = ratio * var_coeff * asv_coeff; var_coeff = var_coeff / 100000; gpufreq_cdev->var_table[i * (gpufreq_cdev->var_temp_size + 1) + j] = (int)var_coeff; } } return 0; free_asv_coeff: kfree(gpufreq_cdev->asv_coeff); free_var_coeff: kfree(gpufreq_cdev->var_coeff); err_mem: return -ENOMEM; } static int lookup_static_power(struct gpufreq_cooling_device *gpufreq_cdev, unsigned long voltage, int temperature, u32 *power) { int volt_index = 0, temp_index = 0; int index = 0; voltage = voltage / 1000; temperature = temperature / 1000; for (volt_index = 0; volt_index <= gpufreq_cdev->var_volt_size; volt_index++) { if (voltage < gpufreq_cdev->var_table[volt_index * ((int)gpufreq_cdev->var_temp_size + 1)]) { volt_index = volt_index - 1; break; } } if (volt_index == 0) volt_index = 1; if (volt_index > gpufreq_cdev->var_volt_size) volt_index = gpufreq_cdev->var_volt_size; for (temp_index = 0; temp_index <= gpufreq_cdev->var_temp_size; temp_index++) { if (temperature < gpufreq_cdev->var_table[temp_index]) { temp_index = temp_index - 1; break; } } if (temp_index == 0) temp_index = 1; if (temp_index > gpufreq_cdev->var_temp_size) temp_index = gpufreq_cdev->var_temp_size; index = (int)(volt_index * (gpufreq_cdev->var_temp_size + 1) + temp_index); *power = (unsigned int)gpufreq_cdev->var_table[index]; return 0; } static u32 gpu_freq_to_power(struct gpufreq_cooling_device *gpufreq_cdev, u32 freq) { int i; struct power_table *pt = gpufreq_cdev->dyn_power_table; for (i = 1; i < gpufreq_cdev->dyn_power_table_entries; i++) if (freq < pt[i].frequency) break; return pt[i - 1].power; } static u32 gpu_power_to_freq(struct gpufreq_cooling_device *gpufreq_cdev, u32 power) { int i; struct power_table *pt = gpufreq_cdev->dyn_power_table; for (i = 1; i < gpufreq_cdev->dyn_power_table_entries; i++) if (power < pt[i].power) break; return pt[i - 1].frequency; } /** * get_static_power() - calculate the static power consumed by the gpus * @gpufreq_cdev: struct &gpufreq_cooling_device for this gpu cdev * @tz: thermal zone device in which we're operating * @freq: frequency in KHz * @power: pointer in which to store the calculated static power * * Calculate the static power consumed by the gpus described by * @gpu_actor running at frequency @freq. This function relies on a * platform specific function that should have been provided when the * actor was registered. If it wasn't, the static power is assumed to * be negligible. The calculated static power is stored in @power. * * Return: 0 on success, -E* on failure. */ static int get_static_power(struct gpufreq_cooling_device *gpufreq_cdev, struct thermal_zone_device *tz, unsigned long freq, u32 *power) { unsigned long voltage; if (!freq) { *power = 0; return 0; } voltage = gpu_dvfs_get_voltage(freq); if (voltage == 0) { pr_warn("Failed to get voltage for frequency %lu\n", freq); return -EINVAL; } return lookup_static_power(gpufreq_cdev, voltage, tz->temperature, power); } /** * get_dynamic_power() - calculate the dynamic power * @gpufreq_cdev: &gpufreq_cooling_device for this cdev * @freq: current frequency * * Return: the dynamic power consumed by the gpus described by * @gpufreq_cdev. */ static u32 get_dynamic_power(struct gpufreq_cooling_device *gpufreq_cdev, unsigned long freq) { u32 raw_gpu_power; raw_gpu_power = gpu_freq_to_power(gpufreq_cdev, freq); return (raw_gpu_power * gpufreq_cdev->last_load) / 100; } /** * gpufreq_apply_cooling - function to apply frequency clipping. * @gpufreq_cdev: gpufreq_cooling_device pointer containing frequency * clipping data. * @cooling_state: value of the cooling state. * * Function used to make sure the gpufreq layer is aware of current thermal * limits. The limits are applied by updating the gpufreq policy. * * Return: 0 on success, an error code otherwise (-EINVAL in case wrong * cooling state). */ static int gpufreq_apply_cooling(struct gpufreq_cooling_device *gpufreq_cdev, unsigned long cooling_state) { unsigned int gpu_cooling_freq = 0; /* Check if the old cooling action is same as new cooling action */ if (gpufreq_cdev->gpufreq_state == cooling_state) return 0; gpufreq_cdev->gpufreq_state = cooling_state; gpu_cooling_freq = gpufreq_cooling_get_freq(0, gpufreq_cdev->gpufreq_state); if (gpu_cooling_freq == THERMAL_CFREQ_INVALID) { pr_warn("Failed to convert %lu gpu_level\n", gpufreq_cdev->gpufreq_state); return -EINVAL; } blocking_notifier_call_chain(&gpu_notifier, GPU_THROTTLING, &gpu_cooling_freq); return 0; } /* gpufreq cooling device callback functions are defined below */ /** * gpufreq_get_max_state - callback function to get the max cooling state. * @cdev: thermal cooling device pointer. * @state: fill this variable with the max cooling state. * * Callback for the thermal cooling device to return the gpufreq * max cooling state. * * Return: 0 on success, an error code otherwise. */ static int gpufreq_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) { unsigned int count = 0; int ret; ret = get_property(0, 0, &count, GET_MAXL); if (count > 0) *state = count; return ret; } /** * gpufreq_get_cur_state - callback function to get the current cooling state. * @cdev: thermal cooling device pointer. * @state: fill this variable with the current cooling state. * * Callback for the thermal cooling device to return the gpufreq * current cooling state. * * Return: 0 on success, an error code otherwise. */ static int gpufreq_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state) { struct gpufreq_cooling_device *gpufreq_cdev = cdev->devdata; *state = gpufreq_cdev->gpufreq_state; return 0; } /** * gpufreq_set_cur_state - callback function to set the current cooling state. * @cdev: thermal cooling device pointer. * @state: set this variable to the current cooling state. * * Callback for the thermal cooling device to change the gpufreq * current cooling state. * * Return: 0 on success, an error code otherwise. */ static int gpufreq_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) { struct gpufreq_cooling_device *gpufreq_cdev = cdev->devdata; return gpufreq_apply_cooling(gpufreq_cdev, state); } static int exynos_gpufreq_cooling_get_level(struct thermal_cooling_device *cdev, unsigned long value) { return gpufreq_cooling_get_level(0, value); } static enum gpu_noti_state_t gpu_tstate = GPU_COLD; static int gpufreq_set_cur_temp(struct thermal_cooling_device *cdev, bool suspended, int temp) { enum gpu_noti_state_t tstate; unsigned long value; if (suspended || temp < EXYNOS_COLD_TEMP) tstate = GPU_COLD; else tstate = GPU_NORMAL; if (gpu_tstate == tstate) return 0; gpu_tstate = tstate; value = tstate; blocking_notifier_call_chain(&gpu_notifier, tstate, &value); return 0; } /** * gpufreq_get_requested_power() - get the current power * @cdev: &thermal_cooling_device pointer * @tz: a valid thermal zone device pointer * @power: pointer in which to store the resulting power * * Calculate the current power consumption of the gpus in milliwatts * and store it in @power. This function should actually calculate * the requested power, but it's hard to get the frequency that * gpufreq would have assigned if there were no thermal limits. * Instead, we calculate the current power on the assumption that the * immediate future will look like the immediate past. * * We use the current frequency and the average load since this * function was last called. In reality, there could have been * multiple opps since this function was last called and that affects * the load calculation. While it's not perfectly accurate, this * simplification is good enough and works. REVISIT this, as more * complex code may be needed if experiments show that it's not * accurate enough. * * Return: 0 on success, -E* if getting the static power failed. */ static int gpufreq_get_requested_power(struct thermal_cooling_device *cdev, struct thermal_zone_device *tz, u32 *power) { unsigned long freq; int ret = 0; u32 static_power, dynamic_power; struct gpufreq_cooling_device *gpufreq_cdev = cdev->devdata; u32 load_gpu = 0; freq = gpu_dvfs_get_cur_clock(); load_gpu = gpu_dvfs_get_utilization();; gpufreq_cdev->last_load = load_gpu; dynamic_power = get_dynamic_power(gpufreq_cdev, freq); ret = get_static_power(gpufreq_cdev, tz, freq, &static_power); if (ret) return ret; if (trace_thermal_power_gpu_get_power_enabled()) { trace_thermal_power_gpu_get_power( freq, load_gpu, dynamic_power, static_power); } *power = static_power + dynamic_power; return 0; } /** * gpufreq_state2power() - convert a gpu cdev state to power consumed * @cdev: &thermal_cooling_device pointer * @tz: a valid thermal zone device pointer * @state: cooling device state to be converted * @power: pointer in which to store the resulting power * * Convert cooling device state @state into power consumption in * milliwatts assuming 100% load. Store the calculated power in * @power. * * Return: 0 on success, -EINVAL if the cooling device state could not * be converted into a frequency or other -E* if there was an error * when calculating the static power. */ static int gpufreq_state2power(struct thermal_cooling_device *cdev, struct thermal_zone_device *tz, unsigned long state, u32 *power) { unsigned int freq; u32 static_power, dynamic_power; int ret; struct gpufreq_cooling_device *gpufreq_cdev = cdev->devdata; freq = gpu_freq_table[state].frequency; if (!freq) return -EINVAL; dynamic_power = gpu_freq_to_power(gpufreq_cdev, freq); ret = get_static_power(gpufreq_cdev, tz, freq, &static_power); if (ret) return ret; *power = static_power + dynamic_power; return 0; } /** * gpufreq_power2state() - convert power to a cooling device state * @cdev: &thermal_cooling_device pointer * @tz: a valid thermal zone device pointer * @power: power in milliwatts to be converted * @state: pointer in which to store the resulting state * * Calculate a cooling device state for the gpus described by @cdev * that would allow them to consume at most @power mW and store it in * @state. Note that this calculation depends on external factors * such as the gpu load or the current static power. Calling this * function with the same power as input can yield different cooling * device states depending on those external factors. * * Return: 0 on success, -ENODEV if no gpus are online or -EINVAL if * the calculated frequency could not be converted to a valid state. * The latter should not happen unless the frequencies available to * gpufreq have changed since the initialization of the gpu cooling * device. */ static int gpufreq_power2state(struct thermal_cooling_device *cdev, struct thermal_zone_device *tz, u32 power, unsigned long *state) { unsigned int cur_freq, target_freq; int ret; s32 dyn_power; u32 static_power; struct gpufreq_cooling_device *gpufreq_cdev = cdev->devdata; cur_freq = gpu_dvfs_get_cur_clock(); ret = get_static_power(gpufreq_cdev, tz, cur_freq, &static_power); if (ret) return ret; dyn_power = power - static_power; dyn_power = dyn_power > 0 ? dyn_power : 0; target_freq = gpu_power_to_freq(gpufreq_cdev, dyn_power); *state = gpufreq_cooling_get_level(0, target_freq); if (*state == THERMAL_CSTATE_INVALID) { pr_warn("Failed to convert %dKHz for gpu into a cdev state\n", target_freq); return -EINVAL; } trace_thermal_power_gpu_limit(target_freq, *state, power); return 0; } /* Bind gpufreq callbacks to thermal cooling device ops */ static struct thermal_cooling_device_ops gpufreq_cooling_ops = { .get_max_state = gpufreq_get_max_state, .get_cur_state = gpufreq_get_cur_state, .set_cur_state = gpufreq_set_cur_state, .set_cur_temp = gpufreq_set_cur_temp, .get_cooling_level = exynos_gpufreq_cooling_get_level, }; int exynos_gpu_add_notifier(struct notifier_block *n) { return blocking_notifier_chain_register(&gpu_notifier, n); } /** * __gpufreq_cooling_register - helper function to create gpufreq cooling device * @np: a valid struct device_node to the cooling device device tree node * @clip_gpus: gpumask of gpus where the frequency constraints will happen. * @capacitance: dynamic power coefficient for these gpus * * This interface function registers the gpufreq cooling device with the name * "thermal-gpufreq-%x". This api can support multiple instances of gpufreq * cooling devices. It also gives the opportunity to link the cooling device * with a device tree node, in order to bind it via the thermal DT code. * * Return: a valid struct thermal_cooling_device pointer on success, * on failure, it returns a corresponding ERR_PTR(). */ static struct thermal_cooling_device * __gpufreq_cooling_register(struct device_node *np, const struct cpumask *clip_gpus, u32 capacitance) { struct thermal_cooling_device *cool_dev; struct gpufreq_cooling_device *gpufreq_cdev = NULL; char dev_name[THERMAL_NAME_LENGTH]; int ret = 0; gpufreq_cdev = kzalloc(sizeof(struct gpufreq_cooling_device), GFP_KERNEL); if (!gpufreq_cdev) return ERR_PTR(-ENOMEM); ret = get_idr(&gpufreq_idr, &gpufreq_cdev->id); if (ret) { kfree(gpufreq_cdev); return ERR_PTR(-EINVAL); } if (capacitance) { gpufreq_cooling_ops.get_requested_power = gpufreq_get_requested_power; gpufreq_cooling_ops.state2power = gpufreq_state2power; gpufreq_cooling_ops.power2state = gpufreq_power2state; ret = build_dyn_power_table(gpufreq_cdev, capacitance); if (ret) return ERR_PTR(ret); ret = build_static_power_table(np, gpufreq_cdev); if (ret) return ERR_PTR(ret); } snprintf(dev_name, sizeof(dev_name), "thermal-gpufreq-%d", gpufreq_cdev->id); cool_dev = thermal_of_cooling_device_register(np, dev_name, gpufreq_cdev, &gpufreq_cooling_ops); if (IS_ERR(cool_dev)) { release_idr(&gpufreq_idr, gpufreq_cdev->id); kfree(gpufreq_cdev); return cool_dev; } gpufreq_cdev->cool_dev = cool_dev; gpufreq_cdev->gpufreq_state = 0; mutex_lock(&cooling_gpu_lock); gpufreq_cdev_count++; mutex_unlock(&cooling_gpu_lock); return cool_dev; } /** * gpufreq_cooling_register - function to create gpufreq cooling device. * @clip_gpus: cpumask of gpus where the frequency constraints will happen. * * This interface function registers the gpufreq cooling device with the name * "thermal-gpufreq-%x". This api can support multiple instances of gpufreq * cooling devices. * * Return: a valid struct thermal_cooling_device pointer on success, * on failure, it returns a corresponding ERR_PTR(). */ struct thermal_cooling_device * gpufreq_cooling_register(const struct cpumask *clip_gpus) { return __gpufreq_cooling_register(NULL, clip_gpus, 0); } EXPORT_SYMBOL_GPL(gpufreq_cooling_register); /** * of_gpufreq_cooling_register - function to create gpufreq cooling device. * @np: a valid struct device_node to the cooling device device tree node * @clip_gpus: cpumask of gpus where the frequency constraints will happen. * * This interface function registers the gpufreq cooling device with the name * "thermal-gpufreq-%x". This api can support multiple instances of gpufreq * cooling devices. Using this API, the gpufreq cooling device will be * linked to the device tree node provided. * * Return: a valid struct thermal_cooling_device pointer on success, * on failure, it returns a corresponding ERR_PTR(). */ struct thermal_cooling_device * of_gpufreq_cooling_register(struct device_node *np, const struct cpumask *clip_gpus) { if (!np) return ERR_PTR(-EINVAL); return __gpufreq_cooling_register(np, clip_gpus, 0); } EXPORT_SYMBOL_GPL(of_gpufreq_cooling_register); /** * gpufreq_power_cooling_register() - create gpufreq cooling device with power extensions * @clip_gpus: gpumask of gpus where the frequency constraints will happen * @capacitance: dynamic power coefficient for these gpus * * This interface function registers the gpufreq cooling device with * the name "thermal-gpufreq-%x". This api can support multiple * instances of gpufreq cooling devices. Using this function, the * cooling device will implement the power extensions by using a * simple gpu power model. The gpus must have registered their OPPs * using the OPP library. * * Return: a valid struct thermal_cooling_device pointer on success, * on failure, it returns a corresponding ERR_PTR(). */ struct thermal_cooling_device * gpufreq_power_cooling_register(const struct cpumask *clip_gpus, u32 capacitance) { return __gpufreq_cooling_register(NULL, clip_gpus, capacitance); } EXPORT_SYMBOL(gpufreq_power_cooling_register); /** * of_gpufreq_power_cooling_register() - create gpufreq cooling device with power extensions * @np: a valid struct device_node to the cooling device device tree node * @clip_gpus: gpumask of gpus where the frequency constraints will happen * @capacitance: dynamic power coefficient for these gpus * * This interface function registers the gpufreq cooling device with * the name "thermal-gpufreq-%x". This api can support multiple * instances of gpufreq cooling devices. Using this API, the gpufreq * cooling device will be linked to the device tree node provided. * Using this function, the cooling device will implement the power * extensions by using a simple gpu power model. The gpus must have * registered their OPPs using the OPP library. * * Return: a valid struct thermal_cooling_device pointer on success, * on failure, it returns a corresponding ERR_PTR(). */ struct thermal_cooling_device * of_gpufreq_power_cooling_register(struct device_node *np, const struct cpumask *clip_gpus, u32 capacitance) { if (!np) return ERR_PTR(-EINVAL); return __gpufreq_cooling_register(np, clip_gpus, capacitance); } EXPORT_SYMBOL(of_gpufreq_power_cooling_register); /** * gpufreq_cooling_unregister - function to remove gpufreq cooling device. * @cdev: thermal cooling device pointer. * * This interface function unregisters the "thermal-gpufreq-%x" cooling device. */ void gpufreq_cooling_unregister(struct thermal_cooling_device *cdev) { struct gpufreq_cooling_device *gpufreq_cdev; if (!cdev) return; gpufreq_cdev = cdev->devdata; mutex_lock(&cooling_gpu_lock); gpufreq_cdev_count--; mutex_unlock(&cooling_gpu_lock); thermal_cooling_device_unregister(gpufreq_cdev->cool_dev); release_idr(&gpufreq_idr, gpufreq_cdev->id); kfree(gpufreq_cdev); } EXPORT_SYMBOL_GPL(gpufreq_cooling_unregister); /** * gpu_cooling_table_init - function to make GPU throttling table. * * Return : a valid struct gpu_freq_table pointer on success, * on failture, it returns a corresponding ERR_PTR(). */ static int gpu_cooling_table_init(void) { int i = 0; int num_level = 0, count = 0; unsigned long freq; num_level = gpu_dvfs_get_step(); if (num_level == 0) { pr_err("Faile to get gpu_dvfs_get_step()\n"); return -EINVAL; } /* Table size can be num_of_range + 1 since last row has the value of TABLE_END */ gpu_freq_table = kzalloc(sizeof(struct cpufreq_frequency_table) * (num_level + 1), GFP_KERNEL); if (!gpu_freq_table) return -ENOMEM; for (i = 0; i < num_level; i++) { freq = gpu_dvfs_get_clock(i); if (freq > gpu_dvfs_get_max_freq()) continue; gpu_freq_table[count].flags = 0; gpu_freq_table[count].driver_data = count; gpu_freq_table[count].frequency = (unsigned int)freq; pr_info("[GPU cooling] index : %d, frequency : %d\n", gpu_freq_table[count].driver_data, gpu_freq_table[count].frequency); count++; } if (i == num_level) gpu_freq_table[count].frequency = GPU_TABLE_END; return 0; } static int __init exynos_gpu_cooling_init(void) { struct device_node *np; struct thermal_cooling_device *dev; struct thermal_zone_device *tz; void *gen_block; struct ect_gen_param_table *pwr_coeff; u32 capacitance = 0; int ret = 0; ret = gpu_cooling_table_init(); if (ret) { pr_err("Fail to initialize gpu_cooling_table\n"); return ret; } np = of_find_node_by_name(NULL, "mali"); if (!np) { pr_err("Fail to find device node\n"); return -EINVAL; } tz = thermal_zone_get_zone_by_cool_np(np); if (tz) { gen_block = ect_get_block("GEN"); if (gen_block == NULL) { pr_err("%s: Failed to get gen block from ECT\n", __func__); goto regist; } pwr_coeff = ect_gen_param_get_table(gen_block, "DTM_PWR_Coeff"); if (pwr_coeff == NULL) { pr_err("%s: Failed to get power coeff from ECT\n", __func__); goto regist; } capacitance = pwr_coeff->parameter[tz->id]; } else { pr_err("%s: could not find thermal zone\n", __func__); } regist: dev = __gpufreq_cooling_register(np, NULL, capacitance); if (IS_ERR(dev)) { pr_err("Fail to register gpufreq cooling\n"); return -EINVAL; } return ret; } device_initcall(exynos_gpu_cooling_init);