fix(esp_vfs_console): Update placement of cdcacm_xx_cb when ETS print enabled

Author: SoucheSouche

components/esp_system/linker.lf

@@ -51,14 +51,6 @@ entries:
     if APP_BUILD_TYPE_RAM = n:
         image_process (noflash)
 
-[mapping:vfs_cdcacm]
-archive: libvfs.a
-entries:
-    if ESP_SYSTEM_IN_IRAM = y:
-        if ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF:
-            vfs_cdcacm:cdcacm_tx_cb (noflash)
-            vfs_cdcacm:cdcacm_rx_cb (noflash)
-
 [mapping:esp_system_hal]
 archive: libhal.a
 entries:

components/esp_system/port/usb_console.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2019-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -494,11 +494,13 @@ void esp_usb_console_write_char(char c)
         esp_usb_console_write_buf(&c, 1);
     }
 }
-static inline void write_lock_acquire(void)
+
+static inline __attribute__((always_inline)) void write_lock_acquire(void)
 {
     portENTER_CRITICAL_SAFE(&s_lock);
 }
-static inline void write_lock_release(void)
+
+static inline __attribute__((always_inline)) void write_lock_release(void)
 {
     portEXIT_CRITICAL_SAFE(&s_lock);
 }

components/esp_vfs_console/CMakeLists.txt

@@ -9,7 +9,7 @@ set(srcs "vfs_console.c")
 idf_component_register(SRCS ${srcs}
                        INCLUDE_DIRS include
                        PRIV_REQUIRES vfs esp_driver_uart esp_driver_usb_serial_jtag
-                      )
+                       LDFRAGMENTS linker.lf)
 
 if(CONFIG_ESP_CONSOLE_USB_CDC)
     target_sources(${COMPONENT_LIB} PRIVATE "vfs_cdcacm.c")

components/esp_vfs_console/linker.lf

@@ -0,0 +1,6 @@
+[mapping:esp_vfs_console]
+archive: libesp_vfs_console.a
+entries:
+    if ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF:
+        vfs_cdcacm:cdcacm_tx_cb (noflash)
+        vfs_cdcacm:cdcacm_rx_cb (noflash)

components/esp_vfs_console/test_apps/usb_cdc_vfs/CMakeLists.txt

@@ -7,3 +7,17 @@ set(COMPONENTS main)
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(usb_cdc_vfs_test)
+
+idf_build_get_property(elf EXECUTABLE)
+if(CONFIG_COMPILER_DUMP_RTL_FILES)
+    add_custom_target(check_test_app_sections ALL
+                        COMMAND ${PYTHON} $ENV{IDF_PATH}/tools/ci/check_callgraph.py
+                        --rtl-dirs ${CMAKE_BINARY_DIR}/esp-idf/driver/,${CMAKE_BINARY_DIR}/esp-idf/hal/
+                        --elf-file ${CMAKE_BINARY_DIR}/*.elf
+                        find-refs
+                        --from-sections=.iram0.text
+                        --to-sections=.flash.text,.flash.rodata
+                        --exit-code
+                        DEPENDS ${elf}
+                        )
+endif()

components/esp_vfs_console/test_apps/usb_cdc_vfs/main/test_app_main.c

@@ -8,8 +8,10 @@
 #include <fcntl.h>
 #include <sys/errno.h>
 #include "unity.h"
+#include "unity_test_utils_cache.h"
 #include "esp_private/usb_console.h"
 #include "esp_vfs_cdcacm.h"
+#include "esp_rom_sys.h"
 
 static void flush_write(void)
 {
@@ -263,6 +265,39 @@ static void test_usb_cdc_read_no_exit_on_newline_reception(void)
     vTaskDelay(2);  // wait for tasks to exit
 }
 
+static void IRAM_ATTR test_input_output_post_cache_disable(void *args)
+{
+    static DRAM_ATTR const char test_msg[] = "test_message\n";
+    esp_rom_printf(test_msg);
+}
+
+/**
+ * @brief Test that the tx and rx cb are placed in IRAM correctly
+ */
+static void test_usb_cdc_ets_printf_cache_disabled(void)
+{
+    test_setup(__func__, sizeof(__func__));
+
+    /* make sure blocking mode is enabled */
+    int flags = fcntl(STDIN_FILENO, F_GETFL, 0);
+    fcntl(STDIN_FILENO, F_SETFL, flags & (~O_NONBLOCK));
+
+#if CONFIG_ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF
+    unity_utils_run_cache_disable_stub(test_input_output_post_cache_disable, NULL);
+#else
+#error This test must run with CONFIG_ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF enabled
+#endif
+
+    // send message to the test environment to report successful test
+    char ready_msg[] = "successful test\n";
+    write(fileno(stdout), ready_msg, sizeof(ready_msg));
+
+    fcntl(STDIN_FILENO, F_SETFL, flags);
+    esp_vfs_dev_cdcacm_set_rx_line_endings(ESP_LINE_ENDINGS_CRLF);
+    esp_vfs_dev_cdcacm_set_tx_line_endings(ESP_LINE_ENDINGS_CRLF);
+    vTaskDelay(2);  // wait for tasks to exit
+}
+
 /* Always make sure that the function calling sequence in the main
  * function matches the expected order in the pytest function.
  */
@@ -272,4 +307,5 @@ void app_main(void)
     test_usb_cdc_read_non_blocking();
     test_usb_cdc_read_blocking();
     test_usb_cdc_read_no_exit_on_newline_reception();
+    test_usb_cdc_ets_printf_cache_disabled();
 }

components/esp_vfs_console/test_apps/usb_cdc_vfs/pytest_usb_cdc_vfs.py

@@ -36,3 +36,8 @@ def test_usb_cdc_vfs_default(dut: Dut, test_message: str) -> None:
     dut.expect_exact('test_usb_cdc_read_no_exit_on_newline_reception', timeout=2)
     dut.expect_exact('ready to receive', timeout=2)
     dut.write('!(@*#&(!*@&#((SDasdkjhad\nce')
+
+    # test run: test_usb_cdc_ets_printf_cache_disabled
+    dut.expect_exact('test_usb_cdc_ets_printf_cache_disabled', timeout=2)
+    dut.expect_exact('test_message', timeout=2)
+    dut.expect_exact('successful test', timeout=2)

components/esp_vfs_console/test_apps/usb_cdc_vfs/sdkconfig.defaults

@@ -1,8 +1,12 @@
 # Enable Unity fixture support
 CONFIG_UNITY_ENABLE_FIXTURE=n
 CONFIG_UNITY_ENABLE_IDF_TEST_RUNNER=y
+CONFIG_COMPILER_DUMP_RTL_FILES=y
 
 # Custom partition table for this test app
 CONFIG_ESP_TASK_WDT_INIT=n
 
 CONFIG_ESP_CONSOLE_USB_CDC=y
+
+# one test requires this option to be enabled
+CONFIG_ESP_CONSOLE_USB_CDC_SUPPORT_ETS_PRINTF=y