logging: Cleanup in the internal headers

Added log_internal.h for internal APIs. Move functions out of
log_core.h. Log_core.h shall have only macros and functions related
to logging message creation. Log_core.h is included by log.h thus
number of dependencies in that headers must be limited to minimum
to allow including without risk of circular dependencies.

Signed-off-by: Krzysztof Chruscinski <[email protected]>

Author: nordic-krch

include/logging/log_core.h

@@ -7,14 +7,17 @@
 #define ZEPHYR_INCLUDE_LOGGING_LOG_CORE_H_
 
 #include <logging/log_msg.h>
-#include <logging/log_core2.h>
+#include <logging/log_msg2.h>
 #include <logging/log_instance.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdarg.h>
 #include <syscall.h>
 #include <sys/util.h>
 
+/* This header file keeps all macros and functions needed for creating logging
+ * messages (macros like @ref LOG_ERR).
+ */
 #define LOG_LEVEL_NONE 0U
 #define LOG_LEVEL_ERR  1U
 #define LOG_LEVEL_WRN  2U
@@ -481,27 +484,6 @@ enum log_strdup_action {
 			  LOG_LEVEL_INTERNAL_RAW_STRING, NULL, 0, __VA_ARGS__);\
 } while (0)
 
-
-/** @brief Get name of the log source.
- *
- * @param source_id Source ID.
- * @return Name.
- */
-static inline const char *log_name_get(uint32_t source_id)
-{
-	return __log_const_start[source_id].name;
-}
-
-/** @brief Get compiled level of the log source.
- *
- * @param source_id Source ID.
- * @return Level.
- */
-static inline uint8_t log_compiled_level_get(uint32_t source_id)
-{
-	return __log_const_start[source_id].level;
-}
-
 /** @brief Get index of the log source based on the address of the constant data
  *         associated with the source.
  *
@@ -516,12 +498,6 @@ static inline uint32_t log_const_source_id(
 			sizeof(struct log_source_const_data);
 }
 
-/** @brief Get number of registered sources. */
-static inline uint32_t log_sources_count(void)
-{
-	return log_const_source_id(__log_const_end);
-}
-
 extern struct log_source_dynamic_data __log_dynamic_start[];
 extern struct log_source_dynamic_data __log_dynamic_end[];
 
@@ -534,17 +510,6 @@ extern struct log_source_dynamic_data __log_dynamic_end[];
 #define LOG_INSTANCE_DYNAMIC_DATA(_module_name, _inst) \
 	LOG_ITEM_DYNAMIC_DATA(LOG_INSTANCE_FULL_NAME(_module_name, _inst))
 
-/** @brief Get pointer to the filter set of the log source.
- *
- * @param source_id Source ID.
- *
- * @return Pointer to the filter set.
- */
-static inline uint32_t *log_dynamic_filters_get(uint32_t source_id)
-{
-	return &__log_dynamic_start[source_id].filters;
-}
-
 /** @brief Get index of the log source based on the address of the dynamic data
  *         associated with the source.
  *
@@ -558,12 +523,6 @@ static inline uint32_t log_dynamic_source_id(struct log_source_dynamic_data *dat
 			sizeof(struct log_source_dynamic_data);
 }
 
-/* Initialize runtime filters */
-void z_log_runtime_filters_init(void);
-
-/* Notify log_core that a backend was enabled. */
-void z_log_notify_backend_enabled(void);
-
 /** @brief Dummy function to trigger log messages arguments type checking. */
 static inline __printf_like(1, 2)
 void z_log_printf_arg_checker(const char *fmt, ...)
@@ -710,49 +669,6 @@ void log_generic_from_user(struct log_msg_ids src_level,
  */
 bool log_is_strdup(const void *buf);
 
-/** @brief Free allocated buffer.
- *
- * @param buf Buffer.
- */
-void log_free(void *buf);
-
-/**
- * @brief Get current number of allocated buffers for string duplicates.
- */
-uint32_t log_get_strdup_pool_current_utilization(void);
-
-/**
- * @brief Get maximal number of simultaneously allocated buffers for string
- *	  duplicates.
- *
- * Value can be used to determine pool size.
- */
-uint32_t log_get_strdup_pool_utilization(void);
-
-/**
- * @brief Get length of the longest string duplicated.
- *
- * Value can be used to determine buffer size in the string duplicates pool.
- */
-uint32_t log_get_strdup_longest_string(void);
-
-/** @brief Indicate to the log core that one log message has been dropped.
- */
-void z_log_dropped(void);
-
-/** @brief Read and clear current drop indications counter.
- *
- * @return Dropped count.
- */
-uint32_t z_log_dropped_read_and_clear(void);
-
-/** @brief Check if there are any pending drop notifications.
- *
- * @retval true Pending unreported drop indications.
- * @retval false No pending unreported drop indications.
- */
-bool z_log_dropped_pending(void);
-
 /** @brief Log a message from user mode context.
  *
  * @note This function is intended to be used internally

include/logging/log_core2.h

@@ -169,6 +169,26 @@ void log_backend_enable(struct log_backend const *const backend,
  */
 void log_backend_disable(struct log_backend const *const backend);
 
+/**
+ * @brief Get current number of allocated buffers for string duplicates.
+ */
+uint32_t log_get_strdup_pool_current_utilization(void);
+
+/**
+ * @brief Get maximal number of simultaneously allocated buffers for string
+ *	  duplicates.
+ *
+ * Value can be used to determine pool size.
+ */
+uint32_t log_get_strdup_pool_utilization(void);
+
+/**
+ * @brief Get length of the longest string duplicated.
+ *
+ * Value can be used to determine buffer size in the string duplicates pool.
+ */
+uint32_t log_get_strdup_longest_string(void);
+
 #if defined(CONFIG_LOG) && !defined(CONFIG_LOG_MINIMAL)
 #define LOG_CORE_INIT() log_core_init()
 #define LOG_INIT() log_init()

include/logging/log_ctrl.h

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef ZEPHYR_INCLUDE_LOGGING_LOG_INTERNAL_H_
+#define ZEPHYR_INCLUDE_LOGGING_LOG_INTERNAL_H_
+
+#include <zephyr/types.h>
+#include <sys/__assert.h>
+#include <logging/log_core.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Header contains declarations of functions used internally in the logging,
+ * shared between various portions of logging subsystem. Functions are internal
+ * not intended to be used outside, including logging backends.
+ */
+
+/** @brief Indicate to the log core that one log message has been dropped.
+ */
+void z_log_dropped(void);
+
+/** @brief Read and clear current drop indications counter.
+ *
+ * @return Dropped count.
+ */
+uint32_t z_log_dropped_read_and_clear(void);
+
+/** @brief Check if there are any pending drop notifications.
+ *
+ * @retval true Pending unreported drop indications.
+ * @retval false No pending unreported drop indications.
+ */
+bool z_log_dropped_pending(void);
+
+/** @brief Free allocated buffer.
+ *
+ * @param buf Buffer.
+ */
+void log_free(void *buf);
+
+/* Initialize runtime filters */
+void z_log_runtime_filters_init(void);
+
+/* Notify log_core that a backend was enabled. */
+void z_log_notify_backend_enabled(void);
+
+/** @brief Get pointer to the filter set of the log source.
+ *
+ * @param source_id Source ID.
+ *
+ * @return Pointer to the filter set.
+ */
+static inline uint32_t *log_dynamic_filters_get(uint32_t source_id)
+{
+	return &__log_dynamic_start[source_id].filters;
+}
+
+/** @brief Get number of registered sources. */
+static inline uint32_t log_sources_count(void)
+{
+	return log_const_source_id(__log_const_end);
+}
+
+/** @brief Initialize module for handling logging message. */
+void z_log_msg2_init(void);
+
+/** @brief Commit log message.
+ *
+ * @param msg Message.
+ */
+void z_log_msg2_commit(struct log_msg2 *msg);
+
+/** @brief Get pending log message.
+ *
+ * @param[out] len Message length in bytes is written is @p len is not null.
+ *
+ * @param Message or null if no pending messages.
+ */
+union log_msg2_generic *z_log_msg2_claim(void);
+
+/** @brief Free message.
+ *
+ * @param msg Message.
+ */
+void z_log_msg2_free(union log_msg2_generic *msg);
+
+/** @brief Check if there are any message pending.
+ *
+ * @retval true if at least one message is pending.
+ * @retval false if no message is pending.
+ */
+bool z_log_msg2_pending(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_INCLUDE_LOGGING_LOG_INTERNAL_H_ */

include/logging/log_internal.h

@@ -434,6 +434,14 @@ do { \
 		} \
 	}
 
+/** @brief Allocate log message.
+ *
+ * @param wlen Length in 32 bit words.
+ *
+ * @return allocated space or null if cannot be allocated.
+ */
+struct log_msg2 *z_log_msg2_alloc(uint32_t wlen);
+
 /** @brief Finalize message.
  *
  * Finalization includes setting source, copying data and timestamp in the

include/logging/log_msg2.h

@@ -7,6 +7,7 @@
 #include <shell/shell.h>
 #include <logging/log_ctrl.h>
 #include <logging/log.h>
+#include <logging/log_internal.h>
 #include <string.h>
 
 typedef int (*log_backend_cmd_t)(const struct shell *shell,

subsys/logging/log_cmds.c

@@ -9,8 +9,7 @@
 #include <logging/log_backend.h>
 #include <logging/log_ctrl.h>
 #include <logging/log_output.h>
-#include <logging/log_msg2.h>
-#include <logging/log_core2.h>
+#include <logging/log_internal.h>
 #include <sys/mpsc_pbuf.h>
 #include <sys/printk.h>
 #include <sys_clock.h>