u_logging.h

Go to the documentation of this file.

// Copyright 2020-2025, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Basic logging functionality.
 * @author Jakob Bornecrantz <jakob@collabora.com>
 * @author Simon Zeni <simon.zeni@collabora.com>
 * @ingroup aux_log
 */
 
 
#pragma once
 
#include "xrt/xrt_compiler.h"
#include "xrt/xrt_results.h"
 
#include "util/u_pretty_print.h"
 
#include <stdarg.h>
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
struct xrt_device;
 
 
/*!
 * @defgroup aux_log Logging functions
 * @ingroup aux_util
 */
 
/*!
 * @addtogroup aux_log
 * @{
 */
 
/*!
 * @brief Logging level enum
 */
enum u_logging_level
{
        U_LOGGING_TRACE, //!< Trace messages, highly verbose.
        U_LOGGING_DEBUG, //!< Debug messages, verbose.
        U_LOGGING_INFO,  //!< Info messages: not very verbose, not indicating a problem.
        U_LOGGING_WARN,  //!< Warning messages: indicating a potential problem
        U_LOGGING_ERROR, //!< Error messages: indicating a problem
        U_LOGGING_RAW,   //!< Special level for raw printing, prints a new-line.
};
 
/*!
 * Function typedef for setting the logging sink.
 *
 * @param file   Source file name associated with a message.
 * @param line   Source file line associated with a message.
 * @param func   Function name associated with a message.
 * @param level  Message level: used for formatting or forwarding to native log functions.
 * @param format Format string.
 * @param args   Format parameters.
 * @param data   User data.
 */
typedef void (*u_log_sink_func_t)(const char *file,
                                  int line,
                                  const char *func,
                                  enum u_logging_level level,
                                  const char *format,
                                  va_list args,
                                  void *data);
 
/*!
 * For places where you really want printf, prints a new-line.
 */
#define U_LOG_RAW(...)                                                                                                 \
        do {                                                                                                           \
                u_log(__FILE__, __LINE__, __func__, U_LOGGING_RAW, __VA_ARGS__);                                       \
        } while (false)
 
/*!
 * @name Base Logging Utilities
 * In most cases, you will want to use another macro from this file, or a module/driver-local macro, to do your logging.
 * @{
 */
/*!
 * @brief Log a message at @p level , with file, line, and function context (always logs) - typically wrapped
 * in a helper macro.
 *
 * @param level A @ref u_logging_level value for this message.
 * @param ... Format string and optional format arguments.
 */
#define U_LOG(level, ...)                                                                                              \
        do {                                                                                                           \
                u_log(__FILE__, __LINE__, __func__, level, __VA_ARGS__);                                               \
        } while (false)
 
/*!
 * @brief Log at @p level only if the level is at least @p cond_level - typically wrapped in a helper macro.
 *
 * Adds file, line, and function context. Like U_LOG() but conditional.
 *
 * @param level A @ref u_logging_level value for this message.
 * @param cond_level The minimum @ref u_logging_level that will be actually output.
 * @param ... Format string and optional format arguments.
 */
#define U_LOG_IFL(level, cond_level, ...)                                                                              \
        do {                                                                                                           \
                if (cond_level <= level) {                                                                             \
                        u_log(__FILE__, __LINE__, __func__, level, __VA_ARGS__);                                       \
                }                                                                                                      \
        } while (false)
/*!
 * @brief Log at @p level for a given @ref xrt_device - typically wrapped in a helper macro.
 *
 * Adds file, line, and function context, and forwards device context from provided @p xdev .
 *
 * Like U_LOG() but calling u_log_xdev() (which takes a device) instead.
 *
 * @param level A @ref u_logging_level value for this message.
 * @param xdev The @ref xrt_device pointer associated with this message.
 * @param ... Format string and optional format arguments.
 */
#define U_LOG_XDEV(level, xdev, ...)                                                                                   \
        do {                                                                                                           \
                u_log_xdev(__FILE__, __LINE__, __func__, level, xdev, __VA_ARGS__);                                    \
        } while (false)
/*!
 * @brief Log at @p level for a given @ref xrt_device, only if the level is at least @p cond_level - typically wrapped
 * in a helper macro.
 *
 * Adds file, line, and function context, and forwards device context from provided @p xdev .
 * @param level A @ref u_logging_level value for this message.
 * @param cond_level The minimum @ref u_logging_level that will be actually output.
 * @param xdev The @ref xrt_device pointer associated with this message.
 * @param ... Format string and optional format arguments.
 */
#define U_LOG_XDEV_IFL(level, cond_level, xdev, ...)                                                                   \
        do {                                                                                                           \
                if (cond_level <= level) {                                                                             \
                        u_log_xdev(__FILE__, __LINE__, __func__, level, xdev, __VA_ARGS__);                            \
                }                                                                                                      \
        } while (false)
 
/*!
 * @brief Log a memory hexdump at @p level only if the level is at least @p cond_level - typically wrapped in a helper
 * macro.
 *
 * Adds file, line, and function context. Like U_LOG_IFL()
 *
 * @param level A @ref u_logging_level value for this message.
 * @param cond_level The minimum @ref u_logging_level that will be actually output.
 * @param data The data to print in hexdump format
 * @param data_size The size (in bytes) of the data block
 */
#define U_LOG_IFL_HEX(level, cond_level, data, data_size)                                                              \
        do {                                                                                                           \
                if (cond_level <= level) {                                                                             \
                        u_log_hex(__FILE__, __LINE__, __func__, level, data, data_size);                               \
                }                                                                                                      \
        } while (false)
 
/*!
 * @brief Log a memory hexdump at @p level for a given @ref xrt_device, only if the level is at least @p cond_level -
 * typically wrapped in a helper macro.
 *
 * Adds file, line, and function context, and forwards device context from provided @p xdev .
 * @param level A @ref u_logging_level value for this message.
 * @param cond_level The minimum @ref u_logging_level that will be actually output.
 * @param xdev The @ref xrt_device pointer associated with this message.
 * @param data The data to print in hexdump format
 * @param data_size The size (in bytes) of the data block
 */
#define U_LOG_XDEV_IFL_HEX(level, cond_level, xdev, data, data_size)                                                   \
        do {                                                                                                           \
                if (cond_level <= level) {                                                                             \
                        u_log_xdev_hex(__FILE__, __LINE__, __func__, level, xdev, data, data_size);                    \
                }                                                                                                      \
        } while (false)
 
/*!
 * This define will error if `XRET` is not `XRT_SUCCESS`, printing out that the
 * @p FUNC_STR string has failed, then returns @p XRET.
 *
 * @param COND_LEVEL Log level used for @p cond_level, in logging helpers.
 * @param XRET       The @p xrt_result_t to check.
 * @param FUNC_STR   String literal with the function name, used for logging.
 */
#define U_LOG_CHK_AND_RET(COND_LEVEL, XRET, FUNC_STR)                                                                  \
        do {                                                                                                           \
                xrt_result_t _ret = XRET;                                                                              \
                if (_ret != XRT_SUCCESS) {                                                                             \
                        u_log_print_result(COND_LEVEL, __FILE__, __LINE__, __func__, _ret, FUNC_STR);                  \
                        return _ret;                                                                                   \
                }                                                                                                      \
        } while (false)
 
/*!
 * This define will error if `XRET` is not `XRT_SUCCESS`, printing out that the
 * @p FUNC_STR string has failed, then gotos @p GOTO.
 *
 * @param COND_LEVEL Log level used for @p cond_level, in logging helpers.
 * @param XRET       The @p xrt_result_t to check.
 * @param FUNC_STR   String literal with the function name, used for logging.
 * @param GOTO      Goto label to jump to on error.
 */
#define U_LOG_CHK_WITH_GOTO(COND_LEVEL, XRET, FUNC_STR, GOTO)                                                          \
        do {                                                                                                           \
                xrt_result_t _ret = XRET;                                                                              \
                if (_ret != XRT_SUCCESS) {                                                                             \
                        u_log_print_result(COND_LEVEL, __FILE__, __LINE__, __func__, _ret, FUNC_STR);                  \
                        goto GOTO;                                                                                     \
                }                                                                                                      \
        } while (false)
 
/*!
 * This define will error if `XRET` is not `XRT_SUCCESS`, printing out that the
 * @p FUNC_STR string has failed, then returns @p RET.
 *
 * @param COND_LEVEL Log level used for @p cond_level, in logging helpers.
 * @param XRET       The @p xrt_result_t to check.
 * @param FUNC_STR   String literal with the function name, used for logging.
 * @param RET       The value that is returned on error.
 */
#define U_LOG_CHK_WITH_RET(COND_LEVEL, XRET, FUNC_STR, RET)                                                            \
        do {                                                                                                           \
                xrt_result_t _ret = XRET;                                                                              \
                if (_ret != XRT_SUCCESS) {                                                                             \
                        u_log_print_result(COND_LEVEL, __FILE__, __LINE__, __func__, _ret, FUNC_STR);                  \
                        return RET;                                                                                    \
                }                                                                                                      \
        } while (false)
 
/*!
 * This define will error if `XRET` is not `XRT_SUCCESS`, printing out that the
 * @p FUNC_STR string has failed, it only prints and does nothing else.
 *
 * @param COND_LEVEL Log level used for @p cond_level, in logging helpers.
 * @param XRET       The @p xrt_result_t to check.
 * @param FUNC_STR   String literal with the function name, used for logging.
 */
#define U_LOG_CHK_ONLY_PRINT(COND_LEVEL, XRET, FUNC_STR)                                                               \
        do {                                                                                                           \
                xrt_result_t _ret = XRET;                                                                              \
                if (_ret != XRT_SUCCESS) {                                                                             \
                        u_log_print_result(COND_LEVEL, __FILE__, __LINE__, __func__, _ret, FUNC_STR);                  \
                }                                                                                                      \
        } while (false)
 
/*!
 * This define will error if `XRET` is not `XRT_SUCCESS`, printing out that the
 * @p FUNC_STR string has failed, then it will always return the value.
 *
 * @param COND_LEVEL Log level used for @p cond_level, in logging helpers.
 * @param XRET       The @p xrt_result_t to check and always return.
 * @param FUNC_STR   String literal with the function name, used for logging.
 */
#define U_LOG_CHK_ALWAYS_RET(COND_LEVEL, XRET, FUNC_STR)                                                               \
        do {                                                                                                           \
                xrt_result_t _ret = XRET;                                                                              \
                if (_ret != XRT_SUCCESS) {                                                                             \
                        u_log_print_result(COND_LEVEL, __FILE__, __LINE__, __func__, _ret, FUNC_STR);                  \
                }                                                                                                      \
                return _ret;                                                                                           \
        } while (false)
 
/*!
 * Returns the global logging level, subsystems own logging level take precedence.
 */
enum u_logging_level
u_log_get_global_level(void);
 
/*!
 * @brief Main non-device-related log implementation function: do not call directly, use a macro that wraps it.
 *
 * This function always logs: level is used for printing or passed to native logging functions.
 *
 * @param file Source file name associated with a message
 * @param line Source file line associated with a message
 * @param func Function name associated with a message
 * @param level Message level: used for formatting or forwarding to native log functions
 * @param format Format string
 * @param ... Format parameters
 */
void
u_log(const char *file, int line, const char *func, enum u_logging_level level, const char *format, ...)
    XRT_PRINTF_FORMAT(5, 6);
 
/*!
 * @brief Main device-related log implementation function: do not call directly, use a macro that wraps it.
 *
 * This function always logs: level is used for printing or passed to native logging functions.
 * @param file Source file name associated with a message
 * @param line Source file line associated with a message
 * @param func Function name associated with a message
 * @param level Message level: used for formatting or forwarding to native log functions
 * @param xdev The associated @ref xrt_device
 * @param format Format string
 * @param ... Format parameters
 */
void
u_log_xdev(const char *file,
           int line,
           const char *func,
           enum u_logging_level level,
           struct xrt_device *xdev,
           const char *format,
           ...) XRT_PRINTF_FORMAT(6, 7);
 
/*!
 * @brief Log implementation for dumping memory buffers as hex: do not call directly, use a macro that wraps it.
 *
 * This function always logs: level is used for printing or passed to native logging functions.
 *
 * @param file Source file name associated with a message
 * @param line Source file line associated with a message
 * @param func Function name associated with a message
 * @param level Message level: used for formatting or forwarding to native log functions
 * @param data Data buffer to dump
 * @param data_size Size of the data buffer in bytes
 */
void
u_log_hex(const char *file,
          int line,
          const char *func,
          enum u_logging_level level,
          const uint8_t *data,
          const size_t data_size);
 
/*!
 * @brief Device-related log implementation for dumping memory buffers as hex: do not call directly, use a macro that
 * wraps it.
 *
 * This function always logs: level is used for printing or passed to native logging functions.
 * @param file Source file name associated with a message
 * @param line Source file line associated with a message
 * @param func Function name associated with a message
 * @param level Message level: used for formatting or forwarding to native log functions
 * @param xdev The associated @ref xrt_device
 * @param data Data buffer to dump
 * @param data_size Size of the data buffer in bytes
 */
void
u_log_xdev_hex(const char *file,
               int line,
               const char *func,
               enum u_logging_level level,
               struct xrt_device *xdev,
               const uint8_t *data,
               const size_t data_size);
 
/*!
 * Sets the logging sink, log is still passed on to the platform defined output
 * as well as the sink.
 *
 * @param func Logging function for the calls to be sent to.
 * @param data User data to be passed into @p func.
 */
void
u_log_set_sink(u_log_sink_func_t func, void *data);
 
/*!
 * Helper to print the results of called functions that return xret results, if
 * the result is @p XRT_SUCCESS will log with info, otherwise error. Will also
 * check if logging should be done with @p cond_level.
 *
 * @param cond_level What the current logging level is.
 * @param file       Callee site (__FILE__).
 * @param line       Callee site (__LINE__).
 * @param calling_fn Callee site (__func__).
 * @param xret       Result from the called function.
 * @param called_fn  Which function that this return is from.
 */
void
u_log_print_result(enum u_logging_level cond_level,
                   const char *file,
                   int line,
                   const char *calling_fn,
                   xrt_result_t xret,
                   const char *called_fn);
 
/*!
 * @}
 */
 
 
/*!
 * @name Logging macros conditional on global log level
 *
 * These each imply a log level, and will only log if the global log level is equal or lower.
 * They are often used for one-off logging in a module with few other logging needs,
 * where having a module-specific log level would be unnecessary.
 *
 * @see U_LOG_IFL, u_log_get_global_level()
 * @param ... Format string and optional format arguments.
 * @{
 */
//! Log a message at U_LOGGING_TRACE level, conditional on the global log level
#define U_LOG_T(...) U_LOG_IFL_T(u_log_get_global_level(), __VA_ARGS__)
 
//! Log a message at U_LOGGING_DEBUG level, conditional on the global log level
#define U_LOG_D(...) U_LOG_IFL_D(u_log_get_global_level(), __VA_ARGS__)
 
//! Log a message at U_LOGGING_INFO level, conditional on the global log level
#define U_LOG_I(...) U_LOG_IFL_I(u_log_get_global_level(), __VA_ARGS__)
 
//! Log a message at U_LOGGING_WARN level, conditional on the global log level
#define U_LOG_W(...) U_LOG_IFL_W(u_log_get_global_level(), __VA_ARGS__)
 
//! Log a message at U_LOGGING_ERROR level, conditional on the global log level
#define U_LOG_E(...) U_LOG_IFL_E(u_log_get_global_level(), __VA_ARGS__)
 
/*!
 * @}
 */
 
/*!
 * @name Logging macros conditional on provided log level
 *
 * These are often wrapped within a module, to automatically supply
 * @p cond_level as appropriate for that module.
 *
 * @see U_LOG_IFL
 * @param cond_level The minimum @ref u_logging_level that will be actually output.
 * @param ... Format string and optional format arguments.
 *
 * @{
 */
//! Conditionally log a message at U_LOGGING_TRACE level.
#define U_LOG_IFL_T(cond_level, ...) U_LOG_IFL(U_LOGGING_TRACE, cond_level, __VA_ARGS__)
//! Conditionally log a message at U_LOGGING_DEBUG level.
#define U_LOG_IFL_D(cond_level, ...) U_LOG_IFL(U_LOGGING_DEBUG, cond_level, __VA_ARGS__)
//! Conditionally log a message at U_LOGGING_INFO level.
#define U_LOG_IFL_I(cond_level, ...) U_LOG_IFL(U_LOGGING_INFO, cond_level, __VA_ARGS__)
//! Conditionally log a message at U_LOGGING_WARN level.
#define U_LOG_IFL_W(cond_level, ...) U_LOG_IFL(U_LOGGING_WARN, cond_level, __VA_ARGS__)
//! Conditionally log a message at U_LOGGING_ERROR level.
#define U_LOG_IFL_E(cond_level, ...) U_LOG_IFL(U_LOGGING_ERROR, cond_level, __VA_ARGS__)
 
//! Conditionally log a memory hexdump at U_LOGGING_TRACE level.
#define U_LOG_IFL_T_HEX(cond_level, data, data_size) U_LOG_IFL_HEX(U_LOGGING_TRACE, cond_level, data, data_size)
//! Conditionally log a memory hexdump at U_LOGGING_DEBUG level.
#define U_LOG_IFL_D_HEX(cond_level, data, data_size) U_LOG_IFL_HEX(U_LOGGING_DEBUG, cond_level, data, data_size)
/*!
 * @}
 */
 
 
 
/*!
 * @name Device-related logging macros conditional on provided log level
 *
 * These are often wrapped within a driver, to automatically supply @p xdev and
 * @p cond_level from their conventional names and log level member variable.
 *
 * @param level A @ref u_logging_level value for this message.
 * @param cond_level The minimum @ref u_logging_level that will be actually output.
 * @param xdev The @ref xrt_device pointer associated with this message.
 * @param ... Format string and optional format arguments.
 *
 * @{
 */
//! Conditionally log a device-related message at U_LOGGING_TRACE level.
#define U_LOG_XDEV_IFL_T(xdev, cond_level, ...) U_LOG_XDEV_IFL(U_LOGGING_TRACE, cond_level, xdev, __VA_ARGS__)
//! Conditionally log a device-related message at U_LOGGING_DEBUG level.
#define U_LOG_XDEV_IFL_D(xdev, cond_level, ...) U_LOG_XDEV_IFL(U_LOGGING_DEBUG, cond_level, xdev, __VA_ARGS__)
//! Conditionally log a device-related message at U_LOGGING_INFO level.
#define U_LOG_XDEV_IFL_I(xdev, cond_level, ...) U_LOG_XDEV_IFL(U_LOGGING_INFO, cond_level, xdev, __VA_ARGS__)
//! Conditionally log a device-related message at U_LOGGING_WARN level.
#define U_LOG_XDEV_IFL_W(xdev, cond_level, ...) U_LOG_XDEV_IFL(U_LOGGING_WARN, cond_level, xdev, __VA_ARGS__)
//! Conditionally log a device-related message at U_LOGGING_ERROR level.
#define U_LOG_XDEV_IFL_E(xdev, cond_level, ...) U_LOG_XDEV_IFL(U_LOGGING_ERROR, cond_level, xdev, __VA_ARGS__)
 
//! Conditionally log a device-related memory hexdump at U_LOGGING_TRACE level.
#define U_LOG_XDEV_IFL_T_HEX(xdev, cond_level, data, data_size)                                                        \
        U_LOG_XDEV_IFL_HEX(U_LOGGING_TRACE, cond_level, xdev, data, data_size)
//! Conditionally log a device-related memory hexdump message at U_LOGGING_DEBUG level.
#define U_LOG_XDEV_IFL_D_HEX(xdev, cond_level, data, data_size)                                                        \
        U_LOG_XDEV_IFL_HEX(U_LOGGING_DEBUG, cond_level, xdev, data, data_size)
/*!
 * @}
 */
 
/*!
 * @name Device-related error logging macros
 *
 * These are printed from a driver at error level.
 *
 * @param xdev The @ref xrt_device pointer associated with this message
 *
 * @{
 */
#define U_LOG_XDEV_UNSUPPORTED_INPUT(xdev, cond_level, name)                                                           \
        do {                                                                                                           \
                struct u_pp_sink_stack_only sink;                                                                      \
                u_pp_delegate_t dg = u_pp_sink_stack_only_init(&sink);                                                 \
                u_pp_xrt_input_name(dg, name);                                                                         \
                U_LOG_XDEV_IFL_E(xdev, cond_level, "Unsupported input: %s", sink.buffer);                              \
        } while (false);
 
#define U_LOG_XDEV_UNSUPPORTED_OUTPUT(xdev, cond_level, name)                                                          \
        do {                                                                                                           \
                struct u_pp_sink_stack_only sink;                                                                      \
                u_pp_delegate_t dg = u_pp_sink_stack_only_init(&sink);                                                 \
                u_pp_xrt_output_name(dg, name);                                                                        \
                U_LOG_XDEV_IFL_E(xdev, cond_level, "Unsupported output: %s", sink.buffer);                             \
        } while (false);
 
/*!
 * @}
 */
 
/*!
 * @name Device-related logging macros that always log.
 *
 * These wrap U_LOG_XDEV() to supply the @p level - which is only used for formatting the output, these macros always
 * log regardless of level.
 *
 * @param xdev The @ref xrt_device pointer associated with this message.
 * @param ... Format string and optional format arguments.
 * @{
 */
//! Log a device-related message at U_LOGGING_TRACE level (always logs).
#define U_LOG_XDEV_T(xdev, ...) U_LOG_XDEV(U_LOGGING_TRACE, xdev, __VA_ARGS__)
//! Log a device-related message at U_LOGGING_DEBUG level (always logs).
#define U_LOG_XDEV_D(xdev, ...) U_LOG_XDEV(U_LOGGING_DEBUG, xdev, __VA_ARGS__)
//! Log a device-related message at U_LOGGING_INFO level (always logs).
#define U_LOG_XDEV_I(xdev, ...) U_LOG_XDEV(U_LOGGING_INFO, xdev, __VA_ARGS__)
//! Log a device-related message at U_LOGGING_WARN level (always logs).
#define U_LOG_XDEV_W(xdev, ...) U_LOG_XDEV(U_LOGGING_WARN, xdev, __VA_ARGS__)
//! Log a device-related message at U_LOGGING_ERROR level (always logs).
#define U_LOG_XDEV_E(xdev, ...) U_LOG_XDEV(U_LOGGING_ERROR, xdev, __VA_ARGS__)
/*!
 * @}
 */
 
/*!
 * @}
 */
 
 
#ifdef __cplusplus
}
#endif