1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2017 Google, Inc
6 * Written by Simon Glass <sjg@chromium.org>
12 #include <dm/uclass.h>
14 DECLARE_GLOBAL_DATA_PTR;
16 static const char *log_cat_name[LOGC_COUNT - LOGC_NONE] = {
26 static const char *log_level_name[LOGL_COUNT] = {
39 const char *log_get_cat_name(enum log_category_t cat)
43 if (cat < 0 || cat >= LOGC_COUNT)
46 return log_cat_name[cat - LOGC_NONE];
48 #if CONFIG_IS_ENABLED(DM)
49 name = uclass_get_name((enum uclass_id)cat);
54 return name ? name : "<missing>";
57 enum log_category_t log_get_cat_by_name(const char *name)
62 for (i = LOGC_NONE; i < LOGC_COUNT; i++)
63 if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
65 id = uclass_get_by_name(name);
66 if (id != UCLASS_INVALID)
67 return (enum log_category_t)id;
72 const char *log_get_level_name(enum log_level_t level)
74 if (level >= LOGL_COUNT)
76 return log_level_name[level];
79 enum log_level_t log_get_level_by_name(const char *name)
83 for (i = 0; i < LOGL_COUNT; i++) {
84 if (!strcasecmp(log_level_name[i], name))
91 static struct log_device *log_device_find_by_name(const char *drv_name)
93 struct log_device *ldev;
95 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
96 if (!strcmp(drv_name, ldev->drv->name))
104 * log_has_cat() - check if a log category exists within a list
106 * @cat_list: List of categories to check, at most LOGF_MAX_CATEGORIES entries
107 * long, terminated by LC_END if fewer
108 * @cat: Category to search for
109 * @return true if @cat is in @cat_list, else false
111 static bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
115 for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
116 if (cat_list[i] == cat)
124 * log_has_file() - check if a file is with a list
126 * @file_list: List of files to check, separated by comma
127 * @file: File to check for. This string is matched against the end of each
128 * file in the list, i.e. ignoring any preceding path. The list is
129 * intended to consist of relative pathnames, e.g. common/main.c,cmd/log.c
130 * @return true if @file is in @file_list, else false
132 static bool log_has_file(const char *file_list, const char *file)
134 int file_len = strlen(file);
138 for (s = file_list; *s; s = p + (*p != '\0')) {
139 p = strchrnul(s, ',');
141 if (file_len >= substr_len &&
142 !strncmp(file + file_len - substr_len, s, substr_len))
150 * log_passes_filters() - check if a log record passes the filters for a device
152 * @ldev: Log device to check
153 * @rec: Log record to check
154 * @return true if @rec is not blocked by the filters in @ldev, false if it is
156 static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
158 struct log_filter *filt;
160 /* If there are no filters, filter on the default log level */
161 if (list_empty(&ldev->filter_head)) {
162 if (rec->level > gd->default_log_level)
167 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
168 if (rec->level > filt->max_level)
170 if ((filt->flags & LOGFF_HAS_CAT) &&
171 !log_has_cat(filt->cat_list, rec->cat))
173 if (filt->file_list &&
174 !log_has_file(filt->file_list, rec->file))
183 * log_dispatch() - Send a log record to all log devices for processing
185 * The log record is sent to each log device in turn, skipping those which have
186 * filters which block the record
188 * @rec: Log record to dispatch
189 * @return 0 (meaning success)
191 static int log_dispatch(struct log_rec *rec)
193 struct log_device *ldev;
194 static int processing_msg;
197 * When a log driver writes messages (e.g. via the network stack) this
198 * may result in further generated messages. We cannot process them here
199 * as this might result in infinite recursion.
206 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
207 if (log_passes_filters(ldev, rec))
208 ldev->drv->emit(ldev, rec);
214 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
215 int line, const char *func, const char *fmt, ...)
217 char buf[CONFIG_SYS_CBSIZE];
227 vsnprintf(buf, sizeof(buf), fmt, args);
230 if (!gd || !(gd->flags & GD_FLG_LOG_READY)) {
232 gd->log_drop_count++;
240 int log_add_filter(const char *drv_name, enum log_category_t cat_list[],
241 enum log_level_t max_level, const char *file_list)
243 struct log_filter *filt;
244 struct log_device *ldev;
248 ldev = log_device_find_by_name(drv_name);
251 filt = calloc(1, sizeof(*filt));
256 filt->flags |= LOGFF_HAS_CAT;
258 if (i == ARRAY_SIZE(filt->cat_list)) {
262 filt->cat_list[i] = cat_list[i];
263 if (cat_list[i] == LOGC_END)
267 filt->max_level = max_level;
269 filt->file_list = strdup(file_list);
270 if (!filt->file_list) {
275 filt->filter_num = ldev->next_filter_num++;
276 list_add_tail(&filt->sibling_node, &ldev->filter_head);
278 return filt->filter_num;
285 int log_remove_filter(const char *drv_name, int filter_num)
287 struct log_filter *filt;
288 struct log_device *ldev;
290 ldev = log_device_find_by_name(drv_name);
294 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
295 if (filt->filter_num == filter_num) {
296 list_del(&filt->sibling_node);
308 struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
309 const int count = ll_entry_count(struct log_driver, log_driver);
310 struct log_driver *end = drv + count;
313 * We cannot add runtime data to the driver since it is likely stored
314 * in rodata. Instead, set up a 'device' corresponding to each driver.
315 * We only support having a single device.
317 INIT_LIST_HEAD((struct list_head *)&gd->log_head);
319 struct log_device *ldev;
321 ldev = calloc(1, sizeof(*ldev));
323 debug("%s: Cannot allocate memory\n", __func__);
326 INIT_LIST_HEAD(&ldev->filter_head);
328 list_add_tail(&ldev->sibling_node,
329 (struct list_head *)&gd->log_head);
332 gd->flags |= GD_FLG_LOG_READY;
333 if (!gd->default_log_level)
334 gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
335 gd->log_fmt = log_get_default_format();