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log: Add an implementation of logging 

Add the logging header file and implementation with some configuration
options to control it.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2017-12-04 13:48:24 -07:00 committed by Tom Rini
parent c5404b64fb
commit e9c8d49d54
6 changed files with 555 additions and 0 deletions
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7
MAINTAINERS
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@ -310,6 +310,13 @@ S: Maintained
T: git git://git.denx.de/u-boot-i2c.git
F: drivers/i2c/
LOGGING
M: Simon Glass <sjg@chromium.org>
S: Maintained
T: git git://git.denx.de/u-boot.git
F: common/log.c
F: cmd/log.c
MICROBLAZE
M: Michal Simek <monstr@monstr.eu>
S: Maintained

56
common/Kconfig
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@ -420,6 +420,62 @@ config SYS_STDIO_DEREGISTER
endmenu
menu "Logging"
config LOG
bool "Enable logging support"
help
This enables support for logging of status and debug messages. These
can be displayed on the console, recorded in a memory buffer, or
discarded if not needed. Logging supports various categories and
levels of severity.
config SPL_LOG
bool "Enable logging support in SPL"
help
This enables support for logging of status and debug messages. These
can be displayed on the console, recorded in a memory buffer, or
discarded if not needed. Logging supports various categories and
levels of severity.
config LOG_MAX_LEVEL
int "Maximum log level to record"
depends on LOG
default 5
help
This selects the maximum log level that will be recorded. Any value
higher than this will be ignored. If possible log statements below
this level will be discarded at build time. Levels:
0 - panic
1 - critical
2 - error
3 - warning
4 - note
5 - info
6 - detail
7 - debug
config SPL_LOG_MAX_LEVEL
int "Maximum log level to record in SPL"
depends on SPL_LOG
default 3
help
This selects the maximum log level that will be recorded. Any value
higher than this will be ignored. If possible log statements below
this level will be discarded at build time. Levels:
0 - panic
1 - critical
2 - error
3 - warning
4 - note
5 - info
6 - detail
7 - debug
endmenu
config DEFAULT_FDT_FILE
string "Default fdt file"
help

1
common/Makefile
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@ -128,5 +128,6 @@ obj-y += cli.o
obj-$(CONFIG_FSL_DDR_INTERACTIVE) += cli_simple.o cli_readline.o
obj-$(CONFIG_CMD_DFU) += dfu.o
obj-y += command.o
obj-$(CONFIG_$(SPL_)LOG) += log.o
obj-y += s_record.o
obj-y += xyzModem.o

244
common/log.c Normal file
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@ -0,0 +1,244 @@
/*
* Logging support
*
* Copyright (c) 2017 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <log.h>
#include <malloc.h>
DECLARE_GLOBAL_DATA_PTR;
static struct log_device *log_device_find_by_name(const char *drv_name)
{
struct log_device *ldev;
list_for_each_entry(ldev, &gd->log_head, sibling_node) {
if (!strcmp(drv_name, ldev->drv->name))
return ldev;
}
return NULL;
}
/**
* log_has_cat() - check if a log category exists within a list
*
* @cat_list: List of categories to check, at most LOGF_MAX_CATEGORIES entries
* long, terminated by LC_END if fewer
* @cat: Category to search for
* @return true if @cat is in @cat_list, else false
*/
static bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
{
int i;
for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
if (cat_list[i] == cat)
return true;
}
return false;
}
/**
* log_has_file() - check if a file is with a list
*
* @file_list: List of files to check, separated by comma
* @file: File to check for. This string is matched against the end of each
* file in the list, i.e. ignoring any preceding path. The list is
* intended to consist of relative pathnames, e.g. common/main.c,cmd/log.c
* @return true if @file is in @file_list, else false
*/
static bool log_has_file(const char *file_list, const char *file)
{
int file_len = strlen(file);
const char *s, *p;
int substr_len;
for (s = file_list; *s; s = p + (*p != '\0')) {
p = strchrnul(s, ',');
substr_len = p - s;
if (file_len >= substr_len &&
!strncmp(file + file_len - substr_len, s, substr_len))
return true;
}
return false;
}
/**
* log_passes_filters() - check if a log record passes the filters for a device
*
* @ldev: Log device to check
* @rec: Log record to check
* @return true if @rec is not blocked by the filters in @ldev, false if it is
*/
static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
{
struct log_filter *filt;
/* If there are no filters, filter on the default log level */
if (list_empty(&ldev->filter_head)) {
if (rec->level > gd->default_log_level)
return false;
return true;
}
list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
if (rec->level > filt->max_level)
continue;
if ((filt->flags & LOGFF_HAS_CAT) &&
!log_has_cat(filt->cat_list, rec->cat))
continue;
if (filt->file_list &&
!log_has_file(filt->file_list, rec->file))
continue;
return true;
}
return false;
}
/**
* log_dispatch() - Send a log record to all log devices for processing
*
* The log record is sent to each log device in turn, skipping those which have
* filters which block the record
*
* @rec: Log record to dispatch
* @return 0 (meaning success)
*/
static int log_dispatch(struct log_rec *rec)
{
struct log_device *ldev;
list_for_each_entry(ldev, &gd->log_head, sibling_node) {
if (log_passes_filters(ldev, rec))
ldev->drv->emit(ldev, rec);
}
return 0;
}
int _log(enum log_category_t cat, enum log_level_t level, const char *file,
int line, const char *func, const char *fmt, ...)
{
char buf[CONFIG_SYS_CBSIZE];
struct log_rec rec;
va_list args;
rec.cat = cat;
rec.level = level;
rec.file = file;
rec.line = line;
rec.func = func;
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
rec.msg = buf;
if (!gd || !(gd->flags & GD_FLG_LOG_READY)) {
if (gd)
gd->log_drop_count++;
return -ENOSYS;
}
log_dispatch(&rec);
return 0;
}
int log_add_filter(const char *drv_name, enum log_category_t cat_list[],
enum log_level_t max_level, const char *file_list)
{
struct log_filter *filt;
struct log_device *ldev;
int i;
ldev = log_device_find_by_name(drv_name);
if (!ldev)
return -ENOENT;
filt = (struct log_filter *)calloc(1, sizeof(*filt));
if (!filt)
return -ENOMEM;
if (cat_list) {
filt->flags |= LOGFF_HAS_CAT;
for (i = 0; ; i++) {
if (i == ARRAY_SIZE(filt->cat_list))
return -ENOSPC;
filt->cat_list[i] = cat_list[i];
if (cat_list[i] == LOGC_END)
break;
}
}
filt->max_level = max_level;
if (file_list) {
filt->file_list = strdup(file_list);
if (!filt->file_list)
goto nomem;
}
filt->filter_num = ldev->next_filter_num++;
list_add_tail(&filt->sibling_node, &ldev->filter_head);
return filt->filter_num;
nomem:
free(filt);
return -ENOMEM;
}
int log_remove_filter(const char *drv_name, int filter_num)
{
struct log_filter *filt;
struct log_device *ldev;
ldev = log_device_find_by_name(drv_name);
if (!ldev)
return -ENOENT;
list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
if (filt->filter_num == filter_num) {
list_del(&filt->sibling_node);
free(filt);
return 0;
}
}
return -ENOENT;
}
int log_init(void)
{
struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
const int count = ll_entry_count(struct log_driver, log_driver);
struct log_driver *end = drv + count;
/*
* We cannot add runtime data to the driver since it is likely stored
* in rodata. Instead, set up a 'device' corresponding to each driver.
* We only support having a single device.
*/
INIT_LIST_HEAD((struct list_head *)&gd->log_head);
while (drv < end) {
struct log_device *ldev;
ldev = calloc(1, sizeof(*ldev));
if (!ldev) {
debug("%s: Cannot allocate memory\n", __func__);
return -ENOMEM;
}
INIT_LIST_HEAD(&ldev->filter_head);
ldev->drv = drv;
list_add_tail(&ldev->sibling_node,
(struct list_head *)&gd->log_head);
drv++;
}
gd->default_log_level = LOGL_INFO;
return 0;
}

5
include/asm-generic/global_data.h
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@ -114,6 +114,11 @@ typedef struct global_data {
struct bootstage_data *bootstage; /* Bootstage information */
struct bootstage_data *new_bootstage; /* Relocated bootstage info */
#endif
#ifdef CONFIG_LOG
int log_drop_count; /* Number of dropped log messages */
int default_log_level; /* For devices with no filters */
struct list_head log_head; /* List of struct log_device */
#endif
} gd_t;
#endif

242
include/log.h
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@ -10,6 +10,94 @@
#ifndef __LOG_H
#define __LOG_H
#include <dm/uclass-id.h>
#include <linux/list.h>
/** Log levels supported, ranging from most to least important */
enum log_level_t {
LOGL_EMERG = 0, /*U-Boot is unstable */
LOGL_ALERT, /* Action must be taken immediately */
LOGL_CRIT, /* Critical conditions */
LOGL_ERR, /* Error that prevents something from working */
LOGL_WARNING, /* Warning may prevent optimial operation */
LOGL_NOTICE, /* Normal but significant condition, printf() */
LOGL_INFO, /* General information message */
LOGL_DEBUG, /* Basic debug-level message */
LOGL_DEBUG_CONTENT, /* Debug message showing full message content */
LOGL_DEBUG_IO, /* Debug message showing hardware I/O access */
LOGL_COUNT,
LOGL_FIRST = LOGL_EMERG,
LOGL_MAX = LOGL_DEBUG,
};
/**
* Log categories supported. Most of these correspond to uclasses (i.e.
* enum uclass_id) but there are also some more generic categories
*/
enum log_category_t {
LOGC_FIRST = 0, /* First part mirrors UCLASS_... */
LOGC_NONE = UCLASS_COUNT,
LOGC_ARCH,
LOGC_BOARD,
LOGC_CORE,
LOGC_DT,
LOGC_COUNT,
LOGC_END,
};
/* Helper to cast a uclass ID to a log category */
static inline int log_uc_cat(enum uclass_id id)
{
return (enum log_category_t)id;
}
/**
* _log() - Internal function to emit a new log record
*
* @cat: Category of log record (indicating which subsystem generated it)
* @level: Level of log record (indicating its severity)
* @file: File name of file where log record was generated
* @line: Line number in file where log record was generated
* @func: Function where log record was generated
* @fmt: printf() format string for log record
* @...: Optional parameters, according to the format string @fmt
* @return 0 if log record was emitted, -ve on error
*/
int _log(enum log_category_t cat, enum log_level_t level, const char *file,
int line, const char *func, const char *fmt, ...);
/* Define this at the top of a file to add a prefix to debug messages */
#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif
/* Use a default category if this file does not supply one */
#ifndef LOG_CATEGORY
#define LOG_CATEGORY LOGC_NONE
#endif
/*
* This header may be including when CONFIG_LOG is disabled, in which case
* CONFIG_LOG_MAX_LEVEL is not defined. Add a check for this.
*/
#if CONFIG_IS_ENABLED(LOG)
#define _LOG_MAX_LEVEL CONFIG_VAL(LOG_MAX_LEVEL)
#else
#define _LOG_MAX_LEVEL LOGL_INFO
#endif
/* Emit a log record if the level is less that the maximum */
#define log(_cat, _level, _fmt, _args...) ({ \
int _l = _level; \
if (_l <= _LOG_MAX_LEVEL) \
_log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
__func__, \
pr_fmt(_fmt), ##_args); \
})
#ifdef DEBUG
#define _DEBUG 1
#else
@ -22,6 +110,16 @@
#define _SPL_BUILD 0
#endif
#if !_DEBUG && CONFIG_IS_ENABLED(LOG)
#define debug_cond(cond, fmt, args...) \
do { \
if (1) \
log(LOG_CATEGORY, LOGL_DEBUG, fmt, ##args); \
} while (0)
#else /* _DEBUG */
/*
* Output a debug text when condition "cond" is met. The "cond" should be
* computed by a preprocessor in the best case, allowing for the best
@ -33,6 +131,8 @@
printf(pr_fmt(fmt), ##args); \
} while (0)
#endif /* _DEBUG */
/* Show a message if DEBUG is defined in a file */
#define debug(fmt, args...) \
debug_cond(_DEBUG, fmt, ##args)
@ -56,4 +156,146 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line,
({ if (!(x) && _DEBUG) \
__assert_fail(#x, __FILE__, __LINE__, __func__); })
/**
* struct log_rec - a single log record
*
* Holds information about a single record in the log
*
* Members marked as 'not allocated' are stored as pointers and the caller is
* responsible for making sure that the data pointed to is not overwritten.
* Memebers marked as 'allocated' are allocated (e.g. via strdup()) by the log
* system.
*
* @cat: Category, representing a uclass or part of U-Boot
* @level: Severity level, less severe is higher
* @file: Name of file where the log record was generated (not allocated)
* @line: Line number where the log record was generated
* @func: Function where the log record was generated (not allocated)
* @msg: Log message (allocated)
*/
struct log_rec {
enum log_category_t cat;
enum log_level_t level;
const char *file;
int line;
const char *func;
const char *msg;
};
struct log_device;
/**
* struct log_driver - a driver which accepts and processes log records
*
* @name: Name of driver
*/
struct log_driver {
const char *name;
/**
* emit() - emit a log record
*
* Called by the log system to pass a log record to a particular driver
* for processing. The filter is checked before calling this function.
*/
int (*emit)(struct log_device *ldev, struct log_rec *rec);
};
/**
* struct log_device - an instance of a log driver
*
* Since drivers are set up at build-time we need to have a separate device for
* the run-time aspects of drivers (currently just a list of filters to apply
* to records send to this device).
*
* @next_filter_num: Seqence number of next filter filter added (0=no filters
* yet). This increments with each new filter on the device, but never
* decrements
* @drv: Pointer to driver for this device
* @filter_head: List of filters for this device
* @sibling_node: Next device in the list of all devices
*/
struct log_device {
int next_filter_num;
struct log_driver *drv;
struct list_head filter_head;
struct list_head sibling_node;
};
enum {
LOGF_MAX_CATEGORIES = 5, /* maximum categories per filter */
};
enum log_filter_flags {
LOGFF_HAS_CAT = 1 << 0, /* Filter has a category list */
};
/**
* struct log_filter - criterial to filter out log messages
*
* @filter_num: Sequence number of this filter. This is returned when adding a
* new filter, and must be provided when removing a previously added
* filter.
* @flags: Flags for this filter (LOGFF_...)
* @cat_list: List of categories to allow (terminated by LOGC_none). If empty
* then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
* can be provided
* @max_level: Maximum log level to allow
* @file_list: List of files to allow, separated by comma. If NULL then all
* files are permitted
* @sibling_node: Next filter in the list of filters for this log device
*/
struct log_filter {
int filter_num;
int flags;
enum log_category_t cat_list[LOGF_MAX_CATEGORIES];
enum log_level_t max_level;
const char *file_list;
struct list_head sibling_node;
};
#define LOG_DRIVER(_name) \
ll_entry_declare(struct log_driver, _name, log_driver)
/**
* log_add_filter() - Add a new filter to a log device
*
* @drv_name: Driver name to add the filter to (since each driver only has a
* single device)
* @cat_list: List of categories to allow (terminated by LOGC_none). If empty
* then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
* can be provided
* @max_level: Maximum log level to allow
* @file_list: List of files to allow, separated by comma. If NULL then all
* files are permitted
* @return the sequence number of the new filter (>=0) if the filter was added,
* or a -ve value on error
*/
int log_add_filter(const char *drv_name, enum log_category_t cat_list[],
enum log_level_t max_level, const char *file_list);
/**
* log_remove_filter() - Remove a filter from a log device
*
* @drv_name: Driver name to remove the filter from (since each driver only has
* a single device)
* @filter_num: Filter number to remove (as returned by log_add_filter())
* @return 0 if the filter was removed, -ENOENT if either the driver or the
* filter number was not found
*/
int log_remove_filter(const char *drv_name, int filter_num);
#if CONFIG_IS_ENABLED(LOG)
/**
* log_init() - Set up the log system ready for use
*
* @return 0 if OK, -ENOMEM if out of memory
*/
int log_init(void);
#else
static inline int log_init(void)
{
return 0;
}
#endif
#endif