u-boot/common/log.c
Simon Glass af1bc0cf46 log: Plumb logging into the init sequence
Set up logging both before and after relocation.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2017-12-07 15:17:00 -05:00

245 lines
5.6 KiB
C

/*
* 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->flags |= GD_FLG_LOG_READY;
gd->default_log_level = LOGL_INFO;
return 0;
}