esp32: SEGGER SystemView Tracing Support

Implements support for system level traces compatible with SEGGER
SystemView tool on top of ESP32 application tracing module.
That kind of traces can help to analyse program's behaviour.
SystemView can show timeline of tasks/ISRs execution, context switches,
statistics related to the CPUs' load distribution etc.

Also this commit adds useful feature to ESP32 application tracing module:
 - Trace data buffering is implemented to handle temporary peaks of events load

components/esp32/include/esp_app_trace.h

@@ -1,123 +0,0 @@
-// Copyright 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.
-#ifndef ESP_APP_TRACE_H_
-#define ESP_APP_TRACE_H_
-
-#include <stdarg.h>
-#include "esp_err.h"
-
-// infinite waiting timeout
-#define ESP_APPTRACE_TMO_INFINITE               ((uint32_t)-1)
-
-// Trace memory block size
-#define ESP_APPTRACE_TRAX_BLOCK_SIZE            0x4000UL
-
-/**
- * Application trace data destinations bits.
- */
-typedef enum {
-    ESP_APPTRACE_DEST_TRAX = 0x1,
-    ESP_APPTRACE_DEST_UART0 = 0x2,
-    //ESP_APPTRACE_DEST_UART1 = 0x4,
-} esp_apptrace_dest_t;
-
-/**
- * @brief  Initializes application tracing module.
- *
- * @note   Should be called before any esp_apptrace_xxx call.
- *
- * @return ESP_OK on success, otherwise \see esp_err_t
- */
-esp_err_t esp_apptrace_init();
-
-/**
- * @brief Allocates buffer for trace data.
- *        After data in buffer are ready to be sent off esp_apptrace_buffer_put must be called to indicate it.
- *
- * @param dest Indicates HW interface to send data.
- * @param size Size of data to write to trace buffer.
- * @param tmo  Timeout for operation (in us). Use ESP_APPTRACE_TMO_INFINITE to wait indefinetly.
- *
- * @return non-NULL on success, otherwise NULL.
- */
-uint8_t *esp_apptrace_buffer_get(esp_apptrace_dest_t dest, size_t size, uint32_t tmo);
-
-/**
- * @brief Indicates that the data in buffer are ready to be sent off.
- *        This function is a counterpart of must be preceeded by esp_apptrace_buffer_get.
- *
- * @param dest Indicates HW interface to send data. Should be identical to the same parameter in call to esp_apptrace_buffer_get.
- * @param ptr  Address of trace buffer to release. Should be the value returned by call to esp_apptrace_buffer_get.
- * @param tmo  Timeout for operation (in us). Use ESP_APPTRACE_TMO_INFINITE to wait indefinetly.
- *
- * @return ESP_OK on success, otherwise \see esp_err_t
- */
-esp_err_t esp_apptrace_buffer_put(esp_apptrace_dest_t dest, uint8_t *ptr, uint32_t tmo);
-
-/**
- * @brief  Writes data to trace buffer.
- *
- * @param dest Indicates HW interface to send data.
- * @param data Address of data to write to trace buffer.
- * @param size Size of data to write to trace buffer.
- * @param tmo  Timeout for operation (in us). Use ESP_APPTRACE_TMO_INFINITE to wait indefinetly.
- *
- * @return ESP_OK on success, otherwise \see esp_err_t
- */
-esp_err_t esp_apptrace_write(esp_apptrace_dest_t dest, void *data, size_t size, uint32_t tmo);
-
-/**
- * @brief vprintf-like function to sent log messages to host via specified HW interface.
- *
- * @param dest Indicates HW interface to send data.
- * @param fmt  Address of format string.
- * @param ap   List of arguments.
- *
- * @return Number of bytes written.
- */
-int esp_apptrace_vprintf_to(esp_apptrace_dest_t dest, uint32_t user_tmo, const char *fmt, va_list ap);
-
-/**
- * @brief vprintf-like function to sent log messages to host.
- *
- * @param fmt  Address of format string.
- * @param ap   List of arguments.
- *
- * @return Number of bytes written.
- */
-int esp_apptrace_vprintf(const char *fmt, va_list ap);
-
-/**
- * @brief  Flushes remaining data in trace buffer to host.
- *
- * @param dest Indicates HW interface to flush data on.
- * @param tmo  Timeout for operation (in us). Use ESP_APPTRACE_TMO_INFINITE to wait indefinetly.
- *
- * @return ESP_OK on success, otherwise \see esp_err_t
- */
-esp_err_t esp_apptrace_flush(esp_apptrace_dest_t dest, uint32_t tmo);
-
-/**
- * @brief Flushes remaining data in trace buffer to host without locking internal data.
-          This is special version of esp_apptrace_flush which should be called from panic handler.
- *
- * @param dest   Indicates HW interface to flush data on.
- * @param min_sz Threshold for flushing data. If current filling level is above this value, data will be flushed. TRAX destinations only.
- * @param tmo    Timeout for operation (in us). Use ESP_APPTRACE_TMO_INFINITE to wait indefinetly.
- *
- * @return ESP_OK on success, otherwise \see esp_err_t
- */
-esp_err_t esp_apptrace_flush_nolock(esp_apptrace_dest_t dest, uint32_t min_sz, uint32_t tmo);
-
-#endif

components/esp32/include/esp_intr_alloc.h

@@ -77,6 +77,9 @@ extern "C" {
 
 /**@}*/
 
+// This is used to provide SystemView with positive IRQ IDs, otherwise sheduler events are not shown properly
+#define ETS_INTERNAL_INTR_SOURCE_OFF		(-ETS_INTERNAL_PROFILING_INTR_SOURCE)
+
 typedef void (*intr_handler_t)(void *arg); 
 
 
@@ -221,7 +224,6 @@ int esp_intr_get_cpu(intr_handle_t handle);
  */
 int esp_intr_get_intno(intr_handle_t handle);
 
-
 /**
  * @brief Disable the interrupt associated with the handle
  *