1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2017 Google, Inc
6 * Written by Simon Glass <sjg@chromium.org>
12 #include <asm/global_data.h>
13 #include <dm/uclass.h>
15 DECLARE_GLOBAL_DATA_PTR;
17 static const char *const log_cat_name[] = {
33 _Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,
36 static const char *const log_level_name[] = {
49 _Static_assert(ARRAY_SIZE(log_level_name) == LOGL_COUNT, "log_level_name size");
51 /* All error responses MUST begin with '<' */
52 const char *log_get_cat_name(enum log_category_t cat)
56 if (cat < 0 || cat >= LOGC_COUNT)
59 return log_cat_name[cat - LOGC_NONE];
61 #if CONFIG_IS_ENABLED(DM)
62 name = uclass_get_name((enum uclass_id)cat);
67 return name ? name : "<missing>";
70 enum log_category_t log_get_cat_by_name(const char *name)
75 for (i = LOGC_NONE; i < LOGC_COUNT; i++)
76 if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
78 id = uclass_get_by_name(name);
79 if (id != UCLASS_INVALID)
80 return (enum log_category_t)id;
85 const char *log_get_level_name(enum log_level_t level)
87 if (level >= LOGL_COUNT)
89 return log_level_name[level];
92 enum log_level_t log_get_level_by_name(const char *name)
96 for (i = 0; i < LOGL_COUNT; i++) {
97 if (!strcasecmp(log_level_name[i], name))
104 struct log_device *log_device_find_by_name(const char *drv_name)
106 struct log_device *ldev;
108 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
109 if (!strcmp(drv_name, ldev->drv->name))
116 bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
120 for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
121 if (cat_list[i] == cat)
128 bool log_has_file(const char *file_list, const char *file)
130 int file_len = strlen(file);
134 for (s = file_list; *s; s = p + (*p != '\0')) {
135 p = strchrnul(s, ',');
137 if (file_len >= substr_len &&
138 !strncmp(file + file_len - substr_len, s, substr_len))
146 * log_passes_filters() - check if a log record passes the filters for a device
148 * @ldev: Log device to check
149 * @rec: Log record to check
150 * @return true if @rec is not blocked by the filters in @ldev, false if it is
152 static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
154 struct log_filter *filt;
156 if (rec->flags & LOGRECF_FORCE_DEBUG)
159 /* If there are no filters, filter on the default log level */
160 if (list_empty(&ldev->filter_head)) {
161 if (rec->level > gd->default_log_level)
166 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
167 if (filt->flags & LOGFF_LEVEL_MIN) {
168 if (rec->level < filt->level)
170 } else if (rec->level > filt->level) {
174 if ((filt->flags & LOGFF_HAS_CAT) &&
175 !log_has_cat(filt->cat_list, rec->cat))
178 if (filt->file_list &&
179 !log_has_file(filt->file_list, rec->file))
182 if (filt->flags & LOGFF_DENY)
192 * log_dispatch() - Send a log record to all log devices for processing
194 * The log record is sent to each log device in turn, skipping those which have
195 * filters which block the record.
197 * All log messages created while processing log record @rec are ignored.
199 * @rec: log record to dispatch
200 * Return: 0 msg sent, 1 msg not sent while already dispatching another msg
202 static int log_dispatch(struct log_rec *rec, const char *fmt, va_list args)
204 struct log_device *ldev;
205 char buf[CONFIG_SYS_CBSIZE];
208 * When a log driver writes messages (e.g. via the network stack) this
209 * may result in further generated messages. We cannot process them here
210 * as this might result in infinite recursion.
212 if (gd->processing_msg)
216 gd->processing_msg = true;
217 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
218 if ((ldev->flags & LOGDF_ENABLE) &&
219 log_passes_filters(ldev, rec)) {
223 len = vsnprintf(buf, sizeof(buf), fmt, args);
225 gd->log_cont = len && buf[len - 1] != '\n';
227 ldev->drv->emit(ldev, rec);
230 gd->processing_msg = false;
234 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
235 int line, const char *func, const char *fmt, ...)
243 /* Check for message continuation */
244 if (cat == LOGC_CONT)
246 if (level == LOGL_CONT)
247 level = gd->logl_prev;
250 rec.level = level & LOGL_LEVEL_MASK;
252 if (level & LOGL_FORCE_DEBUG)
253 rec.flags |= LOGRECF_FORCE_DEBUG;
255 rec.flags |= LOGRECF_CONT;
261 if (!(gd->flags & GD_FLG_LOG_READY)) {
262 gd->log_drop_count++;
264 /* display dropped traces with console puts and DEBUG_UART */
265 if (rec.level <= CONFIG_LOG_DEFAULT_LEVEL ||
266 rec.flags & LOGRECF_FORCE_DEBUG) {
267 char buf[CONFIG_SYS_CBSIZE];
270 vsnprintf(buf, sizeof(buf), fmt, args);
278 if (!log_dispatch(&rec, fmt, args)) {
280 gd->logl_prev = level;
287 int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
288 enum log_level_t level, const char *file_list,
291 struct log_filter *filt;
292 struct log_device *ldev;
296 ldev = log_device_find_by_name(drv_name);
299 filt = calloc(1, sizeof(*filt));
305 filt->flags |= LOGFF_HAS_CAT;
307 if (i == ARRAY_SIZE(filt->cat_list)) {
311 filt->cat_list[i] = cat_list[i];
312 if (cat_list[i] == LOGC_END)
318 filt->file_list = strdup(file_list);
319 if (!filt->file_list) {
324 filt->filter_num = ldev->next_filter_num++;
325 /* Add deny filters to the beginning of the list */
326 if (flags & LOGFF_DENY)
327 list_add(&filt->sibling_node, &ldev->filter_head);
329 list_add_tail(&filt->sibling_node, &ldev->filter_head);
331 return filt->filter_num;
338 int log_remove_filter(const char *drv_name, int filter_num)
340 struct log_filter *filt;
341 struct log_device *ldev;
343 ldev = log_device_find_by_name(drv_name);
347 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
348 if (filt->filter_num == filter_num) {
349 list_del(&filt->sibling_node);
360 * log_find_device_by_drv() - Find a device by its driver
363 * @return Device associated with that driver, or NULL if not found
365 static struct log_device *log_find_device_by_drv(struct log_driver *drv)
367 struct log_device *ldev;
369 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
370 if (ldev->drv == drv)
374 * It is quite hard to pass an invalid driver since passing an unknown
375 * LOG_GET_DRIVER(xxx) would normally produce a compilation error. But
376 * it is possible to pass NULL, for example, so this
382 int log_device_set_enable(struct log_driver *drv, bool enable)
384 struct log_device *ldev;
386 ldev = log_find_device_by_drv(drv);
390 ldev->flags |= LOGDF_ENABLE;
392 ldev->flags &= ~LOGDF_ENABLE;
399 struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
400 const int count = ll_entry_count(struct log_driver, log_driver);
401 struct log_driver *end = drv + count;
404 * We cannot add runtime data to the driver since it is likely stored
405 * in rodata. Instead, set up a 'device' corresponding to each driver.
406 * We only support having a single device.
408 INIT_LIST_HEAD((struct list_head *)&gd->log_head);
410 struct log_device *ldev;
412 ldev = calloc(1, sizeof(*ldev));
414 debug("%s: Cannot allocate memory\n", __func__);
417 INIT_LIST_HEAD(&ldev->filter_head);
419 ldev->flags = drv->flags;
420 list_add_tail(&ldev->sibling_node,
421 (struct list_head *)&gd->log_head);
424 gd->flags |= GD_FLG_LOG_READY;
425 if (!gd->default_log_level)
426 gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
427 gd->log_fmt = log_get_default_format();
428 gd->logc_prev = LOGC_NONE;
429 gd->logl_prev = LOGL_INFO;