The exynos thermal driver is structured as::
Kernel Core thermal framework
- (thermal_core.c, step_wise.c, cpu_cooling.c)
+ (thermal_core.c, step_wise.c, cpufreq_cooling.c)
^
|
|
S: Supported
F: Documentation/driver-api/thermal/cpu-cooling-api.rst
F: Documentation/driver-api/thermal/cpu-idle-cooling.rst
-F: drivers/thermal/cpu_cooling.c
+F: drivers/thermal/cpufreq_cooling.c
F: drivers/thermal/cpuidle_cooling.c
F: include/linux/cpu_cooling.h
thermal_sys-$(CONFIG_THERMAL_GOV_POWER_ALLOCATOR) += power_allocator.o
# cpufreq cooling
-thermal_sys-$(CONFIG_CPU_FREQ_THERMAL) += cpu_cooling.o
+thermal_sys-$(CONFIG_CPU_FREQ_THERMAL) += cpufreq_cooling.o
thermal_sys-$(CONFIG_CPU_IDLE_THERMAL) += cpuidle_cooling.o
# clock cooling
* Copyright (C) 2013 Texas Instruments Inc.
* Contact: Eduardo Valentin <eduardo.valentin@ti.com>
*
- * Highly based on cpu_cooling.c.
+ * Highly based on cpufreq_cooling.c.
* Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
* Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org>
*/
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/drivers/thermal/cpu_cooling.c
- *
- * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
- *
- * Copyright (C) 2012-2018 Linaro Limited.
- *
- * Authors: Amit Daniel <amit.kachhap@linaro.org>
- * Viresh Kumar <viresh.kumar@linaro.org>
- *
- */
-#include <linux/module.h>
-#include <linux/thermal.h>
-#include <linux/cpufreq.h>
-#include <linux/err.h>
-#include <linux/idr.h>
-#include <linux/pm_opp.h>
-#include <linux/pm_qos.h>
-#include <linux/slab.h>
-#include <linux/cpu.h>
-#include <linux/cpu_cooling.h>
-#include <linux/energy_model.h>
-
-#include <trace/events/thermal.h>
-
-/*
- * Cooling state <-> CPUFreq frequency
- *
- * Cooling states are translated to frequencies throughout this driver and this
- * is the relation between them.
- *
- * Highest cooling state corresponds to lowest possible frequency.
- *
- * i.e.
- * level 0 --> 1st Max Freq
- * level 1 --> 2nd Max Freq
- * ...
- */
-
-/**
- * struct time_in_idle - Idle time stats
- * @time: previous reading of the absolute time that this cpu was idle
- * @timestamp: wall time of the last invocation of get_cpu_idle_time_us()
- */
-struct time_in_idle {
- u64 time;
- u64 timestamp;
-};
-
-/**
- * struct cpufreq_cooling_device - data for cooling device with cpufreq
- * @id: unique integer value corresponding to each cpufreq_cooling_device
- * registered.
- * @last_load: load measured by the latest call to cpufreq_get_requested_power()
- * @cpufreq_state: integer value representing the current state of cpufreq
- * cooling devices.
- * @max_level: maximum cooling level. One less than total number of valid
- * cpufreq frequencies.
- * @em: Reference on the Energy Model of the device
- * @cdev: thermal_cooling_device pointer to keep track of the
- * registered cooling device.
- * @policy: cpufreq policy.
- * @node: list_head to link all cpufreq_cooling_device together.
- * @idle_time: idle time stats
- * @qos_req: PM QoS contraint to apply
- *
- * This structure is required for keeping information of each registered
- * cpufreq_cooling_device.
- */
-struct cpufreq_cooling_device {
- int id;
- u32 last_load;
- unsigned int cpufreq_state;
- unsigned int max_level;
- struct em_perf_domain *em;
- struct cpufreq_policy *policy;
- struct list_head node;
- struct time_in_idle *idle_time;
- struct freq_qos_request qos_req;
-};
-
-static DEFINE_IDA(cpufreq_ida);
-static DEFINE_MUTEX(cooling_list_lock);
-static LIST_HEAD(cpufreq_cdev_list);
-
-#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
-/**
- * get_level: Find the level for a particular frequency
- * @cpufreq_cdev: cpufreq_cdev for which the property is required
- * @freq: Frequency
- *
- * Return: level corresponding to the frequency.
- */
-static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev,
- unsigned int freq)
-{
- int i;
-
- for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
- if (freq > cpufreq_cdev->em->table[i].frequency)
- break;
- }
-
- return cpufreq_cdev->max_level - i - 1;
-}
-
-static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev,
- u32 freq)
-{
- int i;
-
- for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
- if (freq > cpufreq_cdev->em->table[i].frequency)
- break;
- }
-
- return cpufreq_cdev->em->table[i + 1].power;
-}
-
-static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev,
- u32 power)
-{
- int i;
-
- for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
- if (power > cpufreq_cdev->em->table[i].power)
- break;
- }
-
- return cpufreq_cdev->em->table[i + 1].frequency;
-}
-
-/**
- * get_load() - get load for a cpu since last updated
- * @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu
- * @cpu: cpu number
- * @cpu_idx: index of the cpu in time_in_idle*
- *
- * Return: The average load of cpu @cpu in percentage since this
- * function was last called.
- */
-static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu,
- int cpu_idx)
-{
- u32 load;
- u64 now, now_idle, delta_time, delta_idle;
- struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx];
-
- now_idle = get_cpu_idle_time(cpu, &now, 0);
- delta_idle = now_idle - idle_time->time;
- delta_time = now - idle_time->timestamp;
-
- if (delta_time <= delta_idle)
- load = 0;
- else
- load = div64_u64(100 * (delta_time - delta_idle), delta_time);
-
- idle_time->time = now_idle;
- idle_time->timestamp = now;
-
- return load;
-}
-
-/**
- * get_dynamic_power() - calculate the dynamic power
- * @cpufreq_cdev: &cpufreq_cooling_device for this cdev
- * @freq: current frequency
- *
- * Return: the dynamic power consumed by the cpus described by
- * @cpufreq_cdev.
- */
-static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev,
- unsigned long freq)
-{
- u32 raw_cpu_power;
-
- raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq);
- return (raw_cpu_power * cpufreq_cdev->last_load) / 100;
-}
-
-/**
- * cpufreq_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 cpus in milliwatts
- * and store it in @power. This function should actually calculate
- * the requested power, but it's hard to get the frequency that
- * cpufreq 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 cpufreq_get_requested_power(struct thermal_cooling_device *cdev,
- struct thermal_zone_device *tz,
- u32 *power)
-{
- unsigned long freq;
- int i = 0, cpu;
- u32 total_load = 0;
- struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
- struct cpufreq_policy *policy = cpufreq_cdev->policy;
- u32 *load_cpu = NULL;
-
- freq = cpufreq_quick_get(policy->cpu);
-
- if (trace_thermal_power_cpu_get_power_enabled()) {
- u32 ncpus = cpumask_weight(policy->related_cpus);
-
- load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL);
- }
-
- for_each_cpu(cpu, policy->related_cpus) {
- u32 load;
-
- if (cpu_online(cpu))
- load = get_load(cpufreq_cdev, cpu, i);
- else
- load = 0;
-
- total_load += load;
- if (load_cpu)
- load_cpu[i] = load;
-
- i++;
- }
-
- cpufreq_cdev->last_load = total_load;
-
- *power = get_dynamic_power(cpufreq_cdev, freq);
-
- if (load_cpu) {
- trace_thermal_power_cpu_get_power(policy->related_cpus, freq,
- load_cpu, i, *power);
-
- kfree(load_cpu);
- }
-
- return 0;
-}
-
-/**
- * cpufreq_state2power() - convert a cpu 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 cpufreq_state2power(struct thermal_cooling_device *cdev,
- struct thermal_zone_device *tz,
- unsigned long state, u32 *power)
-{
- unsigned int freq, num_cpus, idx;
- struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
-
- /* Request state should be less than max_level */
- if (WARN_ON(state > cpufreq_cdev->max_level))
- return -EINVAL;
-
- num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus);
-
- idx = cpufreq_cdev->max_level - state;
- freq = cpufreq_cdev->em->table[idx].frequency;
- *power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus;
-
- return 0;
-}
-
-/**
- * cpufreq_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 cpus 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 cpu 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 cpus 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
- * cpufreq have changed since the initialization of the cpu cooling
- * device.
- */
-static int cpufreq_power2state(struct thermal_cooling_device *cdev,
- struct thermal_zone_device *tz, u32 power,
- unsigned long *state)
-{
- unsigned int target_freq;
- u32 last_load, normalised_power;
- struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
- struct cpufreq_policy *policy = cpufreq_cdev->policy;
-
- last_load = cpufreq_cdev->last_load ?: 1;
- normalised_power = (power * 100) / last_load;
- target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power);
-
- *state = get_level(cpufreq_cdev, target_freq);
- trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state,
- power);
- return 0;
-}
-
-static inline bool em_is_sane(struct cpufreq_cooling_device *cpufreq_cdev,
- struct em_perf_domain *em) {
- struct cpufreq_policy *policy;
- unsigned int nr_levels;
-
- if (!em)
- return false;
-
- policy = cpufreq_cdev->policy;
- if (!cpumask_equal(policy->related_cpus, to_cpumask(em->cpus))) {
- pr_err("The span of pd %*pbl is misaligned with cpufreq policy %*pbl\n",
- cpumask_pr_args(to_cpumask(em->cpus)),
- cpumask_pr_args(policy->related_cpus));
- return false;
- }
-
- nr_levels = cpufreq_cdev->max_level + 1;
- if (em->nr_cap_states != nr_levels) {
- pr_err("The number of cap states in pd %*pbl (%u) doesn't match the number of cooling levels (%u)\n",
- cpumask_pr_args(to_cpumask(em->cpus)),
- em->nr_cap_states, nr_levels);
- return false;
- }
-
- return true;
-}
-#endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */
-
-static unsigned int get_state_freq(struct cpufreq_cooling_device *cpufreq_cdev,
- unsigned long state)
-{
- struct cpufreq_policy *policy;
- unsigned long idx;
-
-#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
- /* Use the Energy Model table if available */
- if (cpufreq_cdev->em) {
- idx = cpufreq_cdev->max_level - state;
- return cpufreq_cdev->em->table[idx].frequency;
- }
-#endif
-
- /* Otherwise, fallback on the CPUFreq table */
- policy = cpufreq_cdev->policy;
- if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
- idx = cpufreq_cdev->max_level - state;
- else
- idx = state;
-
- return policy->freq_table[idx].frequency;
-}
-
-/* cpufreq cooling device callback functions are defined below */
-
-/**
- * cpufreq_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 cpufreq
- * max cooling state.
- *
- * Return: 0 on success, an error code otherwise.
- */
-static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
- unsigned long *state)
-{
- struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
-
- *state = cpufreq_cdev->max_level;
- return 0;
-}
-
-/**
- * cpufreq_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 cpufreq
- * current cooling state.
- *
- * Return: 0 on success, an error code otherwise.
- */
-static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
- unsigned long *state)
-{
- struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
-
- *state = cpufreq_cdev->cpufreq_state;
-
- return 0;
-}
-
-/**
- * cpufreq_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 cpufreq
- * current cooling state.
- *
- * Return: 0 on success, an error code otherwise.
- */
-static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
- unsigned long state)
-{
- struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
-
- /* Request state should be less than max_level */
- if (WARN_ON(state > cpufreq_cdev->max_level))
- return -EINVAL;
-
- /* Check if the old cooling action is same as new cooling action */
- if (cpufreq_cdev->cpufreq_state == state)
- return 0;
-
- cpufreq_cdev->cpufreq_state = state;
-
- return freq_qos_update_request(&cpufreq_cdev->qos_req,
- get_state_freq(cpufreq_cdev, state));
-}
-
-/* Bind cpufreq callbacks to thermal cooling device ops */
-
-static struct thermal_cooling_device_ops cpufreq_cooling_ops = {
- .get_max_state = cpufreq_get_max_state,
- .get_cur_state = cpufreq_get_cur_state,
- .set_cur_state = cpufreq_set_cur_state,
-};
-
-/**
- * __cpufreq_cooling_register - helper function to create cpufreq cooling device
- * @np: a valid struct device_node to the cooling device device tree node
- * @policy: cpufreq policy
- * Normally this should be same as cpufreq policy->related_cpus.
- * @em: Energy Model of the cpufreq policy
- *
- * This interface function registers the cpufreq cooling device with the name
- * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
- * 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 *
-__cpufreq_cooling_register(struct device_node *np,
- struct cpufreq_policy *policy,
- struct em_perf_domain *em)
-{
- struct thermal_cooling_device *cdev;
- struct cpufreq_cooling_device *cpufreq_cdev;
- char dev_name[THERMAL_NAME_LENGTH];
- unsigned int i, num_cpus;
- struct device *dev;
- int ret;
- struct thermal_cooling_device_ops *cooling_ops;
-
- dev = get_cpu_device(policy->cpu);
- if (unlikely(!dev)) {
- pr_warn("No cpu device for cpu %d\n", policy->cpu);
- return ERR_PTR(-ENODEV);
- }
-
-
- if (IS_ERR_OR_NULL(policy)) {
- pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy);
- return ERR_PTR(-EINVAL);
- }
-
- i = cpufreq_table_count_valid_entries(policy);
- if (!i) {
- pr_debug("%s: CPUFreq table not found or has no valid entries\n",
- __func__);
- return ERR_PTR(-ENODEV);
- }
-
- cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL);
- if (!cpufreq_cdev)
- return ERR_PTR(-ENOMEM);
-
- cpufreq_cdev->policy = policy;
- num_cpus = cpumask_weight(policy->related_cpus);
- cpufreq_cdev->idle_time = kcalloc(num_cpus,
- sizeof(*cpufreq_cdev->idle_time),
- GFP_KERNEL);
- if (!cpufreq_cdev->idle_time) {
- cdev = ERR_PTR(-ENOMEM);
- goto free_cdev;
- }
-
- /* max_level is an index, not a counter */
- cpufreq_cdev->max_level = i - 1;
-
- ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL);
- if (ret < 0) {
- cdev = ERR_PTR(ret);
- goto free_idle_time;
- }
- cpufreq_cdev->id = ret;
-
- snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
- cpufreq_cdev->id);
-
- cooling_ops = &cpufreq_cooling_ops;
-
-#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
- if (em_is_sane(cpufreq_cdev, em)) {
- cpufreq_cdev->em = em;
- cooling_ops->get_requested_power = cpufreq_get_requested_power;
- cooling_ops->state2power = cpufreq_state2power;
- cooling_ops->power2state = cpufreq_power2state;
- } else
-#endif
- if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED) {
- pr_err("%s: unsorted frequency tables are not supported\n",
- __func__);
- cdev = ERR_PTR(-EINVAL);
- goto remove_ida;
- }
-
- ret = freq_qos_add_request(&policy->constraints,
- &cpufreq_cdev->qos_req, FREQ_QOS_MAX,
- get_state_freq(cpufreq_cdev, 0));
- if (ret < 0) {
- pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
- ret);
- cdev = ERR_PTR(ret);
- goto remove_ida;
- }
-
- cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev,
- cooling_ops);
- if (IS_ERR(cdev))
- goto remove_qos_req;
-
- mutex_lock(&cooling_list_lock);
- list_add(&cpufreq_cdev->node, &cpufreq_cdev_list);
- mutex_unlock(&cooling_list_lock);
-
- return cdev;
-
-remove_qos_req:
- freq_qos_remove_request(&cpufreq_cdev->qos_req);
-remove_ida:
- ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
-free_idle_time:
- kfree(cpufreq_cdev->idle_time);
-free_cdev:
- kfree(cpufreq_cdev);
- return cdev;
-}
-
-/**
- * cpufreq_cooling_register - function to create cpufreq cooling device.
- * @policy: cpufreq policy
- *
- * This interface function registers the cpufreq cooling device with the name
- * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
- * cooling devices.
- *
- * Return: a valid struct thermal_cooling_device pointer on success,
- * on failure, it returns a corresponding ERR_PTR().
- */
-struct thermal_cooling_device *
-cpufreq_cooling_register(struct cpufreq_policy *policy)
-{
- return __cpufreq_cooling_register(NULL, policy, NULL);
-}
-EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
-
-/**
- * of_cpufreq_cooling_register - function to create cpufreq cooling device.
- * @policy: cpufreq policy
- *
- * This interface function registers the cpufreq cooling device with the name
- * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
- * cooling devices. Using this API, the cpufreq 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 cpu power model. The cpus must have
- * registered their OPPs using the OPP library.
- *
- * It also takes into account, if property present in policy CPU node, the
- * static power consumed by the cpu.
- *
- * Return: a valid struct thermal_cooling_device pointer on success,
- * and NULL on failure.
- */
-struct thermal_cooling_device *
-of_cpufreq_cooling_register(struct cpufreq_policy *policy)
-{
- struct device_node *np = of_get_cpu_node(policy->cpu, NULL);
- struct thermal_cooling_device *cdev = NULL;
-
- if (!np) {
- pr_err("cpu_cooling: OF node not available for cpu%d\n",
- policy->cpu);
- return NULL;
- }
-
- if (of_find_property(np, "#cooling-cells", NULL)) {
- struct em_perf_domain *em = em_cpu_get(policy->cpu);
-
- cdev = __cpufreq_cooling_register(np, policy, em);
- if (IS_ERR(cdev)) {
- pr_err("cpu_cooling: cpu%d failed to register as cooling device: %ld\n",
- policy->cpu, PTR_ERR(cdev));
- cdev = NULL;
- }
- }
-
- of_node_put(np);
- return cdev;
-}
-EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
-
-/**
- * cpufreq_cooling_unregister - function to remove cpufreq cooling device.
- * @cdev: thermal cooling device pointer.
- *
- * This interface function unregisters the "thermal-cpufreq-%x" cooling device.
- */
-void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
-{
- struct cpufreq_cooling_device *cpufreq_cdev;
-
- if (!cdev)
- return;
-
- cpufreq_cdev = cdev->devdata;
-
- mutex_lock(&cooling_list_lock);
- list_del(&cpufreq_cdev->node);
- mutex_unlock(&cooling_list_lock);
-
- thermal_cooling_device_unregister(cdev);
- freq_qos_remove_request(&cpufreq_cdev->qos_req);
- ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
- kfree(cpufreq_cdev->idle_time);
- kfree(cpufreq_cdev);
-}
-EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/drivers/thermal/cpufreq_cooling.c
+ *
+ * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
+ *
+ * Copyright (C) 2012-2018 Linaro Limited.
+ *
+ * Authors: Amit Daniel <amit.kachhap@linaro.org>
+ * Viresh Kumar <viresh.kumar@linaro.org>
+ *
+ */
+#include <linux/module.h>
+#include <linux/thermal.h>
+#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/idr.h>
+#include <linux/pm_opp.h>
+#include <linux/pm_qos.h>
+#include <linux/slab.h>
+#include <linux/cpu.h>
+#include <linux/cpu_cooling.h>
+#include <linux/energy_model.h>
+
+#include <trace/events/thermal.h>
+
+/*
+ * Cooling state <-> CPUFreq frequency
+ *
+ * Cooling states are translated to frequencies throughout this driver and this
+ * is the relation between them.
+ *
+ * Highest cooling state corresponds to lowest possible frequency.
+ *
+ * i.e.
+ * level 0 --> 1st Max Freq
+ * level 1 --> 2nd Max Freq
+ * ...
+ */
+
+/**
+ * struct time_in_idle - Idle time stats
+ * @time: previous reading of the absolute time that this cpu was idle
+ * @timestamp: wall time of the last invocation of get_cpu_idle_time_us()
+ */
+struct time_in_idle {
+ u64 time;
+ u64 timestamp;
+};
+
+/**
+ * struct cpufreq_cooling_device - data for cooling device with cpufreq
+ * @id: unique integer value corresponding to each cpufreq_cooling_device
+ * registered.
+ * @last_load: load measured by the latest call to cpufreq_get_requested_power()
+ * @cpufreq_state: integer value representing the current state of cpufreq
+ * cooling devices.
+ * @max_level: maximum cooling level. One less than total number of valid
+ * cpufreq frequencies.
+ * @em: Reference on the Energy Model of the device
+ * @cdev: thermal_cooling_device pointer to keep track of the
+ * registered cooling device.
+ * @policy: cpufreq policy.
+ * @node: list_head to link all cpufreq_cooling_device together.
+ * @idle_time: idle time stats
+ * @qos_req: PM QoS contraint to apply
+ *
+ * This structure is required for keeping information of each registered
+ * cpufreq_cooling_device.
+ */
+struct cpufreq_cooling_device {
+ int id;
+ u32 last_load;
+ unsigned int cpufreq_state;
+ unsigned int max_level;
+ struct em_perf_domain *em;
+ struct cpufreq_policy *policy;
+ struct list_head node;
+ struct time_in_idle *idle_time;
+ struct freq_qos_request qos_req;
+};
+
+static DEFINE_IDA(cpufreq_ida);
+static DEFINE_MUTEX(cooling_list_lock);
+static LIST_HEAD(cpufreq_cdev_list);
+
+#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
+/**
+ * get_level: Find the level for a particular frequency
+ * @cpufreq_cdev: cpufreq_cdev for which the property is required
+ * @freq: Frequency
+ *
+ * Return: level corresponding to the frequency.
+ */
+static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev,
+ unsigned int freq)
+{
+ int i;
+
+ for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
+ if (freq > cpufreq_cdev->em->table[i].frequency)
+ break;
+ }
+
+ return cpufreq_cdev->max_level - i - 1;
+}
+
+static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev,
+ u32 freq)
+{
+ int i;
+
+ for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
+ if (freq > cpufreq_cdev->em->table[i].frequency)
+ break;
+ }
+
+ return cpufreq_cdev->em->table[i + 1].power;
+}
+
+static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev,
+ u32 power)
+{
+ int i;
+
+ for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
+ if (power > cpufreq_cdev->em->table[i].power)
+ break;
+ }
+
+ return cpufreq_cdev->em->table[i + 1].frequency;
+}
+
+/**
+ * get_load() - get load for a cpu since last updated
+ * @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu
+ * @cpu: cpu number
+ * @cpu_idx: index of the cpu in time_in_idle*
+ *
+ * Return: The average load of cpu @cpu in percentage since this
+ * function was last called.
+ */
+static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu,
+ int cpu_idx)
+{
+ u32 load;
+ u64 now, now_idle, delta_time, delta_idle;
+ struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx];
+
+ now_idle = get_cpu_idle_time(cpu, &now, 0);
+ delta_idle = now_idle - idle_time->time;
+ delta_time = now - idle_time->timestamp;
+
+ if (delta_time <= delta_idle)
+ load = 0;
+ else
+ load = div64_u64(100 * (delta_time - delta_idle), delta_time);
+
+ idle_time->time = now_idle;
+ idle_time->timestamp = now;
+
+ return load;
+}
+
+/**
+ * get_dynamic_power() - calculate the dynamic power
+ * @cpufreq_cdev: &cpufreq_cooling_device for this cdev
+ * @freq: current frequency
+ *
+ * Return: the dynamic power consumed by the cpus described by
+ * @cpufreq_cdev.
+ */
+static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev,
+ unsigned long freq)
+{
+ u32 raw_cpu_power;
+
+ raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq);
+ return (raw_cpu_power * cpufreq_cdev->last_load) / 100;
+}
+
+/**
+ * cpufreq_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 cpus in milliwatts
+ * and store it in @power. This function should actually calculate
+ * the requested power, but it's hard to get the frequency that
+ * cpufreq 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 cpufreq_get_requested_power(struct thermal_cooling_device *cdev,
+ struct thermal_zone_device *tz,
+ u32 *power)
+{
+ unsigned long freq;
+ int i = 0, cpu;
+ u32 total_load = 0;
+ struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
+ struct cpufreq_policy *policy = cpufreq_cdev->policy;
+ u32 *load_cpu = NULL;
+
+ freq = cpufreq_quick_get(policy->cpu);
+
+ if (trace_thermal_power_cpu_get_power_enabled()) {
+ u32 ncpus = cpumask_weight(policy->related_cpus);
+
+ load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL);
+ }
+
+ for_each_cpu(cpu, policy->related_cpus) {
+ u32 load;
+
+ if (cpu_online(cpu))
+ load = get_load(cpufreq_cdev, cpu, i);
+ else
+ load = 0;
+
+ total_load += load;
+ if (load_cpu)
+ load_cpu[i] = load;
+
+ i++;
+ }
+
+ cpufreq_cdev->last_load = total_load;
+
+ *power = get_dynamic_power(cpufreq_cdev, freq);
+
+ if (load_cpu) {
+ trace_thermal_power_cpu_get_power(policy->related_cpus, freq,
+ load_cpu, i, *power);
+
+ kfree(load_cpu);
+ }
+
+ return 0;
+}
+
+/**
+ * cpufreq_state2power() - convert a cpu 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 cpufreq_state2power(struct thermal_cooling_device *cdev,
+ struct thermal_zone_device *tz,
+ unsigned long state, u32 *power)
+{
+ unsigned int freq, num_cpus, idx;
+ struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
+
+ /* Request state should be less than max_level */
+ if (WARN_ON(state > cpufreq_cdev->max_level))
+ return -EINVAL;
+
+ num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus);
+
+ idx = cpufreq_cdev->max_level - state;
+ freq = cpufreq_cdev->em->table[idx].frequency;
+ *power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus;
+
+ return 0;
+}
+
+/**
+ * cpufreq_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 cpus 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 cpu 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 cpus 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
+ * cpufreq have changed since the initialization of the cpu cooling
+ * device.
+ */
+static int cpufreq_power2state(struct thermal_cooling_device *cdev,
+ struct thermal_zone_device *tz, u32 power,
+ unsigned long *state)
+{
+ unsigned int target_freq;
+ u32 last_load, normalised_power;
+ struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
+ struct cpufreq_policy *policy = cpufreq_cdev->policy;
+
+ last_load = cpufreq_cdev->last_load ?: 1;
+ normalised_power = (power * 100) / last_load;
+ target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power);
+
+ *state = get_level(cpufreq_cdev, target_freq);
+ trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state,
+ power);
+ return 0;
+}
+
+static inline bool em_is_sane(struct cpufreq_cooling_device *cpufreq_cdev,
+ struct em_perf_domain *em) {
+ struct cpufreq_policy *policy;
+ unsigned int nr_levels;
+
+ if (!em)
+ return false;
+
+ policy = cpufreq_cdev->policy;
+ if (!cpumask_equal(policy->related_cpus, to_cpumask(em->cpus))) {
+ pr_err("The span of pd %*pbl is misaligned with cpufreq policy %*pbl\n",
+ cpumask_pr_args(to_cpumask(em->cpus)),
+ cpumask_pr_args(policy->related_cpus));
+ return false;
+ }
+
+ nr_levels = cpufreq_cdev->max_level + 1;
+ if (em->nr_cap_states != nr_levels) {
+ pr_err("The number of cap states in pd %*pbl (%u) doesn't match the number of cooling levels (%u)\n",
+ cpumask_pr_args(to_cpumask(em->cpus)),
+ em->nr_cap_states, nr_levels);
+ return false;
+ }
+
+ return true;
+}
+#endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */
+
+static unsigned int get_state_freq(struct cpufreq_cooling_device *cpufreq_cdev,
+ unsigned long state)
+{
+ struct cpufreq_policy *policy;
+ unsigned long idx;
+
+#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
+ /* Use the Energy Model table if available */
+ if (cpufreq_cdev->em) {
+ idx = cpufreq_cdev->max_level - state;
+ return cpufreq_cdev->em->table[idx].frequency;
+ }
+#endif
+
+ /* Otherwise, fallback on the CPUFreq table */
+ policy = cpufreq_cdev->policy;
+ if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
+ idx = cpufreq_cdev->max_level - state;
+ else
+ idx = state;
+
+ return policy->freq_table[idx].frequency;
+}
+
+/* cpufreq cooling device callback functions are defined below */
+
+/**
+ * cpufreq_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 cpufreq
+ * max cooling state.
+ *
+ * Return: 0 on success, an error code otherwise.
+ */
+static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
+
+ *state = cpufreq_cdev->max_level;
+ return 0;
+}
+
+/**
+ * cpufreq_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 cpufreq
+ * current cooling state.
+ *
+ * Return: 0 on success, an error code otherwise.
+ */
+static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
+
+ *state = cpufreq_cdev->cpufreq_state;
+
+ return 0;
+}
+
+/**
+ * cpufreq_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 cpufreq
+ * current cooling state.
+ *
+ * Return: 0 on success, an error code otherwise.
+ */
+static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+{
+ struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
+
+ /* Request state should be less than max_level */
+ if (WARN_ON(state > cpufreq_cdev->max_level))
+ return -EINVAL;
+
+ /* Check if the old cooling action is same as new cooling action */
+ if (cpufreq_cdev->cpufreq_state == state)
+ return 0;
+
+ cpufreq_cdev->cpufreq_state = state;
+
+ return freq_qos_update_request(&cpufreq_cdev->qos_req,
+ get_state_freq(cpufreq_cdev, state));
+}
+
+/* Bind cpufreq callbacks to thermal cooling device ops */
+
+static struct thermal_cooling_device_ops cpufreq_cooling_ops = {
+ .get_max_state = cpufreq_get_max_state,
+ .get_cur_state = cpufreq_get_cur_state,
+ .set_cur_state = cpufreq_set_cur_state,
+};
+
+/**
+ * __cpufreq_cooling_register - helper function to create cpufreq cooling device
+ * @np: a valid struct device_node to the cooling device device tree node
+ * @policy: cpufreq policy
+ * Normally this should be same as cpufreq policy->related_cpus.
+ * @em: Energy Model of the cpufreq policy
+ *
+ * This interface function registers the cpufreq cooling device with the name
+ * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
+ * 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 *
+__cpufreq_cooling_register(struct device_node *np,
+ struct cpufreq_policy *policy,
+ struct em_perf_domain *em)
+{
+ struct thermal_cooling_device *cdev;
+ struct cpufreq_cooling_device *cpufreq_cdev;
+ char dev_name[THERMAL_NAME_LENGTH];
+ unsigned int i, num_cpus;
+ struct device *dev;
+ int ret;
+ struct thermal_cooling_device_ops *cooling_ops;
+
+ dev = get_cpu_device(policy->cpu);
+ if (unlikely(!dev)) {
+ pr_warn("No cpu device for cpu %d\n", policy->cpu);
+ return ERR_PTR(-ENODEV);
+ }
+
+
+ if (IS_ERR_OR_NULL(policy)) {
+ pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy);
+ return ERR_PTR(-EINVAL);
+ }
+
+ i = cpufreq_table_count_valid_entries(policy);
+ if (!i) {
+ pr_debug("%s: CPUFreq table not found or has no valid entries\n",
+ __func__);
+ return ERR_PTR(-ENODEV);
+ }
+
+ cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL);
+ if (!cpufreq_cdev)
+ return ERR_PTR(-ENOMEM);
+
+ cpufreq_cdev->policy = policy;
+ num_cpus = cpumask_weight(policy->related_cpus);
+ cpufreq_cdev->idle_time = kcalloc(num_cpus,
+ sizeof(*cpufreq_cdev->idle_time),
+ GFP_KERNEL);
+ if (!cpufreq_cdev->idle_time) {
+ cdev = ERR_PTR(-ENOMEM);
+ goto free_cdev;
+ }
+
+ /* max_level is an index, not a counter */
+ cpufreq_cdev->max_level = i - 1;
+
+ ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL);
+ if (ret < 0) {
+ cdev = ERR_PTR(ret);
+ goto free_idle_time;
+ }
+ cpufreq_cdev->id = ret;
+
+ snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
+ cpufreq_cdev->id);
+
+ cooling_ops = &cpufreq_cooling_ops;
+
+#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
+ if (em_is_sane(cpufreq_cdev, em)) {
+ cpufreq_cdev->em = em;
+ cooling_ops->get_requested_power = cpufreq_get_requested_power;
+ cooling_ops->state2power = cpufreq_state2power;
+ cooling_ops->power2state = cpufreq_power2state;
+ } else
+#endif
+ if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED) {
+ pr_err("%s: unsorted frequency tables are not supported\n",
+ __func__);
+ cdev = ERR_PTR(-EINVAL);
+ goto remove_ida;
+ }
+
+ ret = freq_qos_add_request(&policy->constraints,
+ &cpufreq_cdev->qos_req, FREQ_QOS_MAX,
+ get_state_freq(cpufreq_cdev, 0));
+ if (ret < 0) {
+ pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
+ ret);
+ cdev = ERR_PTR(ret);
+ goto remove_ida;
+ }
+
+ cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev,
+ cooling_ops);
+ if (IS_ERR(cdev))
+ goto remove_qos_req;
+
+ mutex_lock(&cooling_list_lock);
+ list_add(&cpufreq_cdev->node, &cpufreq_cdev_list);
+ mutex_unlock(&cooling_list_lock);
+
+ return cdev;
+
+remove_qos_req:
+ freq_qos_remove_request(&cpufreq_cdev->qos_req);
+remove_ida:
+ ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
+free_idle_time:
+ kfree(cpufreq_cdev->idle_time);
+free_cdev:
+ kfree(cpufreq_cdev);
+ return cdev;
+}
+
+/**
+ * cpufreq_cooling_register - function to create cpufreq cooling device.
+ * @policy: cpufreq policy
+ *
+ * This interface function registers the cpufreq cooling device with the name
+ * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
+ * cooling devices.
+ *
+ * Return: a valid struct thermal_cooling_device pointer on success,
+ * on failure, it returns a corresponding ERR_PTR().
+ */
+struct thermal_cooling_device *
+cpufreq_cooling_register(struct cpufreq_policy *policy)
+{
+ return __cpufreq_cooling_register(NULL, policy, NULL);
+}
+EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
+
+/**
+ * of_cpufreq_cooling_register - function to create cpufreq cooling device.
+ * @policy: cpufreq policy
+ *
+ * This interface function registers the cpufreq cooling device with the name
+ * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
+ * cooling devices. Using this API, the cpufreq 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 cpu power model. The cpus must have
+ * registered their OPPs using the OPP library.
+ *
+ * It also takes into account, if property present in policy CPU node, the
+ * static power consumed by the cpu.
+ *
+ * Return: a valid struct thermal_cooling_device pointer on success,
+ * and NULL on failure.
+ */
+struct thermal_cooling_device *
+of_cpufreq_cooling_register(struct cpufreq_policy *policy)
+{
+ struct device_node *np = of_get_cpu_node(policy->cpu, NULL);
+ struct thermal_cooling_device *cdev = NULL;
+
+ if (!np) {
+ pr_err("cpufreq_cooling: OF node not available for cpu%d\n",
+ policy->cpu);
+ return NULL;
+ }
+
+ if (of_find_property(np, "#cooling-cells", NULL)) {
+ struct em_perf_domain *em = em_cpu_get(policy->cpu);
+
+ cdev = __cpufreq_cooling_register(np, policy, em);
+ if (IS_ERR(cdev)) {
+ pr_err("cpufreq_cooling: cpu%d failed to register as cooling device: %ld\n",
+ policy->cpu, PTR_ERR(cdev));
+ cdev = NULL;
+ }
+ }
+
+ of_node_put(np);
+ return cdev;
+}
+EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
+
+/**
+ * cpufreq_cooling_unregister - function to remove cpufreq cooling device.
+ * @cdev: thermal cooling device pointer.
+ *
+ * This interface function unregisters the "thermal-cpufreq-%x" cooling device.
+ */
+void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
+{
+ struct cpufreq_cooling_device *cpufreq_cdev;
+
+ if (!cdev)
+ return;
+
+ cpufreq_cdev = cdev->devdata;
+
+ mutex_lock(&cooling_list_lock);
+ list_del(&cpufreq_cdev->node);
+ mutex_unlock(&cooling_list_lock);
+
+ thermal_cooling_device_unregister(cdev);
+ freq_qos_remove_request(&cpufreq_cdev->qos_req);
+ ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
+ kfree(cpufreq_cdev->idle_time);
+ kfree(cpufreq_cdev);
+}
+EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);
* Copyright (C) 2013 Texas Instruments Inc.
* Contact: Eduardo Valentin <eduardo.valentin@ti.com>
*
- * Highly based on cpu_cooling.c.
+ * Highly based on cpufreq_cooling.c.
* Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
* Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org>
*/
projects / linux-2.6-microblaze.git / commitdiff