OVMS3-idf/components/esp32/task_wdt.c

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// Copyright 2015-2016 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include <esp_types.h>
#include "esp_err.h"
#include "esp_intr.h"
#include "esp_intr_alloc.h"
#include "esp_attr.h"
#include "esp_freertos_hooks.h"
#include "soc/timer_group_struct.h"
#include "soc/timer_group_reg.h"
#include "esp_log.h"
#include "driver/timer.h"
#include "esp_task_wdt.h"
#if CONFIG_TASK_WDT
static const char* TAG = "task_wdt";
typedef struct wdt_task_t wdt_task_t;
struct wdt_task_t {
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TaskHandle_t task_handle;
bool fed_watchdog;
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wdt_task_t *next;
};
static wdt_task_t *wdt_task_list=NULL;
static portMUX_TYPE taskwdt_spinlock = portMUX_INITIALIZER_UNLOCKED;
static void task_wdt_isr(void *arg) {
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wdt_task_t *wdttask;
const char *cpu;
//Feed the watchdog so we do not reset
TIMERG0.wdt_wprotect=TIMG_WDT_WKEY_VALUE;
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TIMERG0.wdt_feed=1;
TIMERG0.wdt_wprotect=0;
//Ack interrupt
TIMERG0.int_clr_timers.wdt=1;
//We are taking a spinlock while doing I/O (ets_printf) here. Normally, that is a pretty
//bad thing, possibly (temporarily) hanging up the 2nd core and stopping FreeRTOS. In this case,
//something bad already happened and reporting this is considered more important
//than the badness caused by a spinlock here.
portENTER_CRITICAL(&taskwdt_spinlock);
if (!wdt_task_list) {
//No task on list. Maybe none registered yet.
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
}
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//Watchdog got triggered because at least one task did not report in.
ets_printf("Task watchdog got triggered. The following tasks did not feed the watchdog in time:\n");
for (wdttask=wdt_task_list; wdttask!=NULL; wdttask=wdttask->next) {
if (!wdttask->fed_watchdog) {
cpu=xTaskGetAffinity(wdttask->task_handle)==0?DRAM_STR("CPU 0"):DRAM_STR("CPU 1");
if (xTaskGetAffinity(wdttask->task_handle)==tskNO_AFFINITY) cpu=DRAM_STR("CPU 0/1");
ets_printf(" - %s (%s)\n", pcTaskGetTaskName(wdttask->task_handle), cpu);
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}
}
ets_printf(DRAM_STR("Tasks currently running:\n"));
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for (int x=0; x<portNUM_PROCESSORS; x++) {
ets_printf("CPU %d: %s\n", x, pcTaskGetTaskName(xTaskGetCurrentTaskHandleForCPU(x)));
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}
#if CONFIG_TASK_WDT_PANIC
ets_printf("Aborting.\n");
abort();
#endif
portEXIT_CRITICAL(&taskwdt_spinlock);
}
void esp_task_wdt_feed() {
wdt_task_t *wdttask=wdt_task_list;
bool found_task=false, do_feed_wdt=true;
TaskHandle_t handle=xTaskGetCurrentTaskHandle();
portENTER_CRITICAL(&taskwdt_spinlock);
//Walk the linked list of wdt tasks to find this one, as well as see if we need to feed
//the real watchdog timer.
for (wdttask=wdt_task_list; wdttask!=NULL; wdttask=wdttask->next) {
//See if we are at the current task.
if (wdttask->task_handle == handle) {
wdttask->fed_watchdog=true;
found_task=true;
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}
//If even one task in the list doesn't have the do_feed_wdt var set, we do not feed the watchdog.
if (!wdttask->fed_watchdog) do_feed_wdt=false;
}
if (!found_task) {
//This is the first time the task calls the task_wdt_feed function. Create a new entry for it in
//the linked list.
wdt_task_t *newtask=malloc(sizeof(wdt_task_t));
memset(newtask, 0, sizeof(wdt_task_t));
newtask->task_handle=handle;
newtask->fed_watchdog=true;
if (wdt_task_list == NULL) {
wdt_task_list=newtask;
} else {
for (wdttask=wdt_task_list; wdttask->next!=NULL; wdttask=wdttask->next) ;
wdttask->next=newtask;
}
}
if (do_feed_wdt) {
//All tasks have checked in; time to feed the hw watchdog.
TIMERG0.wdt_wprotect=TIMG_WDT_WKEY_VALUE;
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TIMERG0.wdt_feed=1;
TIMERG0.wdt_wprotect=0;
//Reset fed_watchdog status
for (wdttask=wdt_task_list; wdttask!=NULL; wdttask=wdttask->next) wdttask->fed_watchdog=false;
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}
portEXIT_CRITICAL(&taskwdt_spinlock);
}
void esp_task_wdt_delete() {
TaskHandle_t handle=xTaskGetCurrentTaskHandle();
wdt_task_t *wdttask=wdt_task_list;
portENTER_CRITICAL(&taskwdt_spinlock);
//Wdt task list can't be empty
if (!wdt_task_list) {
ESP_LOGE(TAG, "task_wdt_delete: No tasks in list?");
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
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}
if (handle==wdt_task_list) {
//Current task is first on list.
wdt_task_list=wdt_task_list->next;
free(wdttask);
} else {
//Find current task in list
if (wdt_task_list->task_handle==handle) {
//Task is the very first one.
wdt_task_t *freeme=wdt_task_list;
wdt_task_list=wdt_task_list->next;
free(freeme);
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
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}
while (wdttask->next!=NULL && wdttask->next->task_handle!=handle) wdttask=wdttask->next;
if (!wdttask->next) {
ESP_LOGE(TAG, "task_wdt_delete: Task never called task_wdt_feed!");
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
}
wdt_task_t *freeme=wdttask->next;
wdttask->next=wdttask->next->next;
free(freeme);
}
portEXIT_CRITICAL(&taskwdt_spinlock);
}
#if CONFIG_TASK_WDT_CHECK_IDLE_TASK
static bool idle_hook(void) {
#if !CONFIG_TASK_WDT_CHECK_IDLE_TASK_CPU1
if (xPortGetCoreID()!=0) return true;
#endif
esp_task_wdt_feed();
return true;
}
#endif
void esp_task_wdt_init() {
TIMERG0.wdt_wprotect=TIMG_WDT_WKEY_VALUE;
TIMERG0.wdt_config0.sys_reset_length=7; //3.2uS
TIMERG0.wdt_config0.cpu_reset_length=7; //3.2uS
TIMERG0.wdt_config0.level_int_en=1;
TIMERG0.wdt_config0.stg0=TIMG_WDT_STG_SEL_INT; //1st stage timeout: interrupt
TIMERG0.wdt_config0.stg1=TIMG_WDT_STG_SEL_RESET_SYSTEM; //2nd stage timeout: reset system
TIMERG0.wdt_config1.clk_prescale=80*500; //Prescaler: wdt counts in ticks of 0.5mS
TIMERG0.wdt_config2=CONFIG_TASK_WDT_TIMEOUT_S*2000; //Set timeout before interrupt
TIMERG0.wdt_config3=CONFIG_TASK_WDT_TIMEOUT_S*4000; //Set timeout before reset
TIMERG0.wdt_config0.en=1;
TIMERG0.wdt_feed=1;
TIMERG0.wdt_wprotect=0;
#if CONFIG_TASK_WDT_CHECK_IDLE_TASK
esp_register_freertos_idle_hook(idle_hook);
#endif
ESP_ERROR_CHECK( esp_intr_alloc(ETS_TG0_WDT_LEVEL_INTR_SOURCE, 0, task_wdt_isr, NULL, NULL) );
}
#endif