1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2017 Google, Inc
12 #include <dm/uclass.h>
14 DECLARE_GLOBAL_DATA_PTR;
16 static const char *const log_cat_name[] = {
32 _Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,
35 static const char *const log_level_name[] = {
48 _Static_assert(ARRAY_SIZE(log_level_name) == LOGL_COUNT, "log_level_name size");
50 /* All error responses MUST begin with '<' */
51 const char *log_get_cat_name(enum log_category_t cat)
55 if (cat < 0 || cat >= LOGC_COUNT)
58 return log_cat_name[cat - LOGC_NONE];
60 #if CONFIG_IS_ENABLED(DM)
61 name = uclass_get_name((enum uclass_id)cat);
66 return name ? name : "<missing>";
69 enum log_category_t log_get_cat_by_name(const char *name)
74 for (i = LOGC_NONE; i < LOGC_COUNT; i++)
75 if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
77 id = uclass_get_by_name(name);
78 if (id != UCLASS_INVALID)
79 return (enum log_category_t)id;
84 const char *log_get_level_name(enum log_level_t level)
86 if (level >= LOGL_COUNT)
88 return log_level_name[level];
91 enum log_level_t log_get_level_by_name(const char *name)
95 for (i = 0; i < LOGL_COUNT; i++) {
96 if (!strcasecmp(log_level_name[i], name))
103 struct log_device *log_device_find_by_name(const char *drv_name)
105 struct log_device *ldev;
107 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
108 if (!strcmp(drv_name, ldev->drv->name))
115 bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
119 for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
120 if (cat_list[i] == cat)
127 bool log_has_file(const char *file_list, const char *file)
129 int file_len = strlen(file);
133 for (s = file_list; *s; s = p + (*p != '\0')) {
134 p = strchrnul(s, ',');
136 if (file_len >= substr_len &&
137 !strncmp(file + file_len - substr_len, s, substr_len))
145 * log_passes_filters() - check if a log record passes the filters for a device
147 * @ldev: Log device to check
148 * @rec: Log record to check
149 * @return true if @rec is not blocked by the filters in @ldev, false if it is
151 static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
153 struct log_filter *filt;
155 if (rec->force_debug)
158 /* If there are no filters, filter on the default log level */
159 if (list_empty(&ldev->filter_head)) {
160 if (rec->level > gd->default_log_level)
165 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
166 if (filt->flags & LOGFF_LEVEL_MIN) {
167 if (rec->level < filt->level)
169 } else if (rec->level > filt->level) {
173 if ((filt->flags & LOGFF_HAS_CAT) &&
174 !log_has_cat(filt->cat_list, rec->cat))
177 if (filt->file_list &&
178 !log_has_file(filt->file_list, rec->file))
181 if (filt->flags & LOGFF_DENY)
191 * log_dispatch() - Send a log record to all log devices for processing
193 * The log record is sent to each log device in turn, skipping those which have
194 * filters which block the record.
196 * All log messages created while processing log record @rec are ignored.
198 * @rec: log record to dispatch
199 * Return: 0 msg sent, 1 msg not sent while already dispatching another msg
201 static int log_dispatch(struct log_rec *rec)
203 struct log_device *ldev;
206 * When a log driver writes messages (e.g. via the network stack) this
207 * may result in further generated messages. We cannot process them here
208 * as this might result in infinite recursion.
210 if (gd->processing_msg)
214 gd->processing_msg = true;
215 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
216 if ((ldev->flags & LOGDF_ENABLE) &&
217 log_passes_filters(ldev, rec))
218 ldev->drv->emit(ldev, rec);
220 gd->processing_msg = false;
224 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
225 int line, const char *func, const char *fmt, ...)
227 char buf[CONFIG_SYS_CBSIZE];
231 /* Check for message continuation */
232 if (cat == LOGC_CONT)
234 if (level == LOGL_CONT)
235 level = gd->logl_prev;
238 rec.level = level & LOGL_LEVEL_MASK;
239 rec.force_debug = level & LOGL_FORCE_DEBUG;
244 vsnprintf(buf, sizeof(buf), fmt, args);
247 if (!gd || !(gd->flags & GD_FLG_LOG_READY)) {
249 gd->log_drop_count++;
252 if (!log_dispatch(&rec)) {
254 gd->logl_prev = level;
260 int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
261 enum log_level_t level, const char *file_list,
264 struct log_filter *filt;
265 struct log_device *ldev;
269 ldev = log_device_find_by_name(drv_name);
272 filt = calloc(1, sizeof(*filt));
278 filt->flags |= LOGFF_HAS_CAT;
280 if (i == ARRAY_SIZE(filt->cat_list)) {
284 filt->cat_list[i] = cat_list[i];
285 if (cat_list[i] == LOGC_END)
291 filt->file_list = strdup(file_list);
292 if (!filt->file_list) {
297 filt->filter_num = ldev->next_filter_num++;
298 /* Add deny filters to the beginning of the list */
299 if (flags & LOGFF_DENY)
300 list_add(&filt->sibling_node, &ldev->filter_head);
302 list_add_tail(&filt->sibling_node, &ldev->filter_head);
304 return filt->filter_num;
311 int log_remove_filter(const char *drv_name, int filter_num)
313 struct log_filter *filt;
314 struct log_device *ldev;
316 ldev = log_device_find_by_name(drv_name);
320 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
321 if (filt->filter_num == filter_num) {
322 list_del(&filt->sibling_node);
333 * log_find_device_by_drv() - Find a device by its driver
336 * @return Device associated with that driver, or NULL if not found
338 static struct log_device *log_find_device_by_drv(struct log_driver *drv)
340 struct log_device *ldev;
342 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
343 if (ldev->drv == drv)
347 * It is quite hard to pass an invalid driver since passing an unknown
348 * LOG_GET_DRIVER(xxx) would normally produce a compilation error. But
349 * it is possible to pass NULL, for example, so this
355 int log_device_set_enable(struct log_driver *drv, bool enable)
357 struct log_device *ldev;
359 ldev = log_find_device_by_drv(drv);
363 ldev->flags |= LOGDF_ENABLE;
365 ldev->flags &= ~LOGDF_ENABLE;
372 struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
373 const int count = ll_entry_count(struct log_driver, log_driver);
374 struct log_driver *end = drv + count;
377 * We cannot add runtime data to the driver since it is likely stored
378 * in rodata. Instead, set up a 'device' corresponding to each driver.
379 * We only support having a single device.
381 INIT_LIST_HEAD((struct list_head *)&gd->log_head);
383 struct log_device *ldev;
385 ldev = calloc(1, sizeof(*ldev));
387 debug("%s: Cannot allocate memory\n", __func__);
390 INIT_LIST_HEAD(&ldev->filter_head);
392 ldev->flags = drv->flags;
393 list_add_tail(&ldev->sibling_node,
394 (struct list_head *)&gd->log_head);
397 gd->flags |= GD_FLG_LOG_READY;
398 if (!gd->default_log_level)
399 gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
400 gd->log_fmt = log_get_default_format();
401 gd->logc_prev = LOGC_NONE;
402 gd->logl_prev = LOGL_INFO;