esp-idf/components/esp_pm/pm_locks.c

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// Copyright 2016-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdlib.h>
#include <string.h>
#include <sys/lock.h>
#include "esp_pm.h"
#include "esp_system.h"
#include "sys/queue.h"
#include "freertos/FreeRTOS.h"
#include "esp_private/pm_impl.h"
#include "esp_timer.h"
#include "sdkconfig.h"
typedef struct esp_pm_lock {
esp_pm_lock_type_t type; /*!< type passed to esp_pm_lock_create */
int arg; /*!< argument passed to esp_pm_lock_create */
pm_mode_t mode; /*!< implementation-defined mode for this type of lock*/
const char* name; /*!< used to identify the lock */
SLIST_ENTRY(esp_pm_lock) next; /*!< linked list pointer */
size_t count; /*!< lock count */
portMUX_TYPE spinlock; /*!< spinlock used when operating on 'count' */
#ifdef WITH_PROFILING
pm_time_t last_taken; /*!< time what the lock was taken (valid if count > 0) */
pm_time_t time_held; /*!< total time the lock was taken.
If count > 0, this doesn't include the time since last_taken */
size_t times_taken; /*!< number of times the lock was ever taken */
#endif
} esp_pm_lock_t;
static const char* s_lock_type_names[] = {
"CPU_FREQ_MAX",
"APB_FREQ_MAX",
"NO_LIGHT_SLEEP"
};
/* List of all existing locks, used for esp_pm_dump_locks */
static SLIST_HEAD(esp_pm_locks_head, esp_pm_lock) s_list =
SLIST_HEAD_INITIALIZER(s_head);
/* Protects the above list */
static _lock_t s_list_lock;
esp_err_t esp_pm_lock_create(esp_pm_lock_type_t lock_type, int arg,
const char* name, esp_pm_lock_handle_t* out_handle)
{
#ifndef CONFIG_PM_ENABLE
return ESP_ERR_NOT_SUPPORTED;
#endif
if (out_handle == NULL) {
return ESP_ERR_INVALID_ARG;
}
esp_pm_lock_t* new_lock = (esp_pm_lock_t*) calloc(1, sizeof(*new_lock));
if (!new_lock) {
return ESP_ERR_NO_MEM;
}
new_lock->type = lock_type;
new_lock->arg = arg;
new_lock->mode = esp_pm_impl_get_mode(lock_type, arg);
new_lock->name = name;
new_lock->spinlock = (portMUX_TYPE) portMUX_INITIALIZER_UNLOCKED;
*out_handle = new_lock;
_lock_acquire(&s_list_lock);
SLIST_INSERT_HEAD(&s_list, new_lock, next);
_lock_release(&s_list_lock);
return ESP_OK;
}
esp_err_t esp_pm_lock_delete(esp_pm_lock_handle_t handle)
{
#ifndef CONFIG_PM_ENABLE
return ESP_ERR_NOT_SUPPORTED;
#endif
if (handle == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (handle->count > 0) {
return ESP_ERR_INVALID_STATE;
}
_lock_acquire(&s_list_lock);
SLIST_REMOVE(&s_list, handle, esp_pm_lock, next);
_lock_release(&s_list_lock);
free(handle);
return ESP_OK;
}
esp_err_t IRAM_ATTR esp_pm_lock_acquire(esp_pm_lock_handle_t handle)
{
#ifndef CONFIG_PM_ENABLE
return ESP_ERR_NOT_SUPPORTED;
#endif
if (handle == NULL) {
return ESP_ERR_INVALID_ARG;
}
portENTER_CRITICAL_SAFE(&handle->spinlock);
if (handle->count++ == 0) {
pm_time_t now = 0;
#ifdef WITH_PROFILING
now = pm_get_time();
#endif
esp_pm_impl_switch_mode(handle->mode, MODE_LOCK, now);
#ifdef WITH_PROFILING
handle->last_taken = now;
handle->times_taken++;
#endif
}
portEXIT_CRITICAL_SAFE(&handle->spinlock);
return ESP_OK;
}
esp_err_t IRAM_ATTR esp_pm_lock_release(esp_pm_lock_handle_t handle)
{
#ifndef CONFIG_PM_ENABLE
return ESP_ERR_NOT_SUPPORTED;
#endif
if (handle == NULL) {
return ESP_ERR_INVALID_ARG;
}
esp_err_t ret = ESP_OK;
portENTER_CRITICAL_SAFE(&handle->spinlock);
if (handle->count == 0) {
ret = ESP_ERR_INVALID_STATE;
goto out;
}
if (--handle->count == 0) {
pm_time_t now = 0;
#ifdef WITH_PROFILING
now = pm_get_time();
handle->time_held += now - handle->last_taken;
#endif
esp_pm_impl_switch_mode(handle->mode, MODE_UNLOCK, now);
}
out:
portEXIT_CRITICAL_SAFE(&handle->spinlock);
return ret;
}
esp_err_t esp_pm_dump_locks(FILE* stream)
{
#ifndef CONFIG_PM_ENABLE
return ESP_ERR_NOT_SUPPORTED;
#endif
#ifdef WITH_PROFILING
pm_time_t cur_time = pm_get_time();
pm_time_t cur_time_d100 = cur_time / 100;
#endif // WITH_PROFILING
_lock_acquire(&s_list_lock);
#ifdef WITH_PROFILING
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fprintf(stream, "Time since bootup: %lld us\n", cur_time);
#endif
fprintf(stream, "Lock stats:\n");
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#ifdef WITH_PROFILING
fprintf(stream, "%-15s %-14s %-5s %-8s %-13s %-8s %-8s\n",
"Name", "Type", "Arg", "Active", "Total_count", "Time(us)", "Time(%)");
#else
fprintf(stream, "%-15s %-14s %-5s %-8s\n", "Name", "Type", "Arg", "Active");
#endif
esp_pm_lock_t* it;
char line[80];
SLIST_FOREACH(it, &s_list, next) {
char *buf = line;
size_t len = sizeof(line);
size_t cb;
portENTER_CRITICAL(&it->spinlock);
if (it->name == NULL) {
cb = snprintf(buf, len, "lock@%p ", it);
} else {
cb = snprintf(buf, len, "%-15.15s ", it->name);
}
assert(cb <= len); // above formats should fit into sizeof(line)
buf += cb;
len -= cb;
#ifdef WITH_PROFILING
pm_time_t time_held = it->time_held;
if (it->count > 0) {
time_held += cur_time - it->last_taken;
}
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snprintf(buf, len, "%-14s %-5d %-8d %-13d %-8lld %-3lld%%\n",
s_lock_type_names[it->type], it->arg,
it->count, it->times_taken, time_held,
(time_held + cur_time_d100 - 1) / cur_time_d100);
#else
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snprintf(buf, len, "%-14s %-5d %-8d\n", s_lock_type_names[it->type], it->arg, it->count);
#endif // WITH_PROFILING
portEXIT_CRITICAL(&it->spinlock);
fputs(line, stream);
}
_lock_release(&s_list_lock);
#ifdef WITH_PROFILING
esp_pm_impl_dump_stats(stream);
#endif
return ESP_OK;
}