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[] = {
34 _Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,
37 static const char *const log_level_name[] = {
50 _Static_assert(ARRAY_SIZE(log_level_name) == LOGL_COUNT, "log_level_name size");
52 /* All error responses MUST begin with '<' */
53 const char *log_get_cat_name(enum log_category_t cat)
57 if (cat < 0 || cat >= LOGC_COUNT)
60 return log_cat_name[cat - LOGC_NONE];
62 #if CONFIG_IS_ENABLED(DM)
63 name = uclass_get_name((enum uclass_id)cat);
68 return name ? name : "<missing>";
71 enum log_category_t log_get_cat_by_name(const char *name)
76 for (i = LOGC_NONE; i < LOGC_COUNT; i++)
77 if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
79 id = uclass_get_by_name(name);
80 if (id != UCLASS_INVALID)
81 return (enum log_category_t)id;
86 const char *log_get_level_name(enum log_level_t level)
88 if (level >= LOGL_COUNT)
90 return log_level_name[level];
93 enum log_level_t log_get_level_by_name(const char *name)
97 for (i = 0; i < LOGL_COUNT; i++) {
98 if (!strcasecmp(log_level_name[i], name))
105 struct log_device *log_device_find_by_name(const char *drv_name)
107 struct log_device *ldev;
109 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
110 if (!strcmp(drv_name, ldev->drv->name))
117 bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
121 for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
122 if (cat_list[i] == cat)
129 bool log_has_file(const char *file_list, const char *file)
131 int file_len = strlen(file);
135 for (s = file_list; *s; s = p + (*p != '\0')) {
136 p = strchrnul(s, ',');
138 if (file_len >= substr_len &&
139 !strncmp(file + file_len - substr_len, s, substr_len))
147 * log_passes_filters() - check if a log record passes the filters for a device
149 * @ldev: Log device to check
150 * @rec: Log record to check
151 * Return: true if @rec is not blocked by the filters in @ldev, false if it is
153 static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
155 struct log_filter *filt;
157 if (rec->flags & LOGRECF_FORCE_DEBUG)
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 (filt->flags & LOGFF_LEVEL_MIN) {
169 if (rec->level < filt->level)
171 } else if (rec->level > filt->level) {
175 if ((filt->flags & LOGFF_HAS_CAT) &&
176 !log_has_cat(filt->cat_list, rec->cat))
179 if (filt->file_list &&
180 !log_has_file(filt->file_list, rec->file))
183 if (filt->flags & LOGFF_DENY)
193 * log_dispatch() - Send a log record to all log devices for processing
195 * The log record is sent to each log device in turn, skipping those which have
196 * filters which block the record.
198 * All log messages created while processing log record @rec are ignored.
200 * @rec: log record to dispatch
201 * Return: 0 msg sent, 1 msg not sent while already dispatching another msg
203 static int log_dispatch(struct log_rec *rec, const char *fmt, va_list args)
205 struct log_device *ldev;
206 char buf[CONFIG_SYS_CBSIZE];
209 * When a log driver writes messages (e.g. via the network stack) this
210 * may result in further generated messages. We cannot process them here
211 * as this might result in infinite recursion.
213 if (gd->processing_msg)
217 gd->processing_msg = true;
218 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
219 if ((ldev->flags & LOGDF_ENABLE) &&
220 log_passes_filters(ldev, rec)) {
224 len = vsnprintf(buf, sizeof(buf), fmt, args);
226 gd->log_cont = len && buf[len - 1] != '\n';
228 ldev->drv->emit(ldev, rec);
231 gd->processing_msg = false;
235 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
236 int line, const char *func, const char *fmt, ...)
244 /* Check for message continuation */
245 if (cat == LOGC_CONT)
247 if (level == LOGL_CONT)
248 level = gd->logl_prev;
251 rec.level = level & LOGL_LEVEL_MASK;
253 if (level & LOGL_FORCE_DEBUG)
254 rec.flags |= LOGRECF_FORCE_DEBUG;
256 rec.flags |= LOGRECF_CONT;
262 if (!(gd->flags & GD_FLG_LOG_READY)) {
263 gd->log_drop_count++;
265 /* display dropped traces with console puts and DEBUG_UART */
266 if (rec.level <= CONFIG_LOG_DEFAULT_LEVEL ||
267 rec.flags & LOGRECF_FORCE_DEBUG) {
268 char buf[CONFIG_SYS_CBSIZE];
271 vsnprintf(buf, sizeof(buf), fmt, args);
279 if (!log_dispatch(&rec, fmt, args)) {
281 gd->logl_prev = level;
288 #define MAX_LINE_LENGTH_BYTES 64
289 #define DEFAULT_LINE_LENGTH_BYTES 16
291 int _log_buffer(enum log_category_t cat, enum log_level_t level,
292 const char *file, int line, const char *func, ulong addr,
293 const void *data, uint width, uint count, uint linelen)
295 if (linelen * width > MAX_LINE_LENGTH_BYTES)
296 linelen = MAX_LINE_LENGTH_BYTES / width;
298 linelen = DEFAULT_LINE_LENGTH_BYTES / width;
302 char buf[HEXDUMP_MAX_BUF_LENGTH(width * linelen)];
304 thislinelen = hexdump_line(addr, data, width, count, linelen,
306 assert(thislinelen >= 0);
307 _log(cat, level, file, line, func, "%s\n", buf);
309 /* update references */
310 data += thislinelen * width;
311 addr += thislinelen * width;
312 count -= thislinelen;
318 int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
319 enum log_level_t level, const char *file_list,
322 struct log_filter *filt;
323 struct log_device *ldev;
327 ldev = log_device_find_by_name(drv_name);
330 filt = calloc(1, sizeof(*filt));
336 filt->flags |= LOGFF_HAS_CAT;
338 if (i == ARRAY_SIZE(filt->cat_list)) {
342 filt->cat_list[i] = cat_list[i];
343 if (cat_list[i] == LOGC_END)
349 filt->file_list = strdup(file_list);
350 if (!filt->file_list) {
355 filt->filter_num = ldev->next_filter_num++;
356 /* Add deny filters to the beginning of the list */
357 if (flags & LOGFF_DENY)
358 list_add(&filt->sibling_node, &ldev->filter_head);
360 list_add_tail(&filt->sibling_node, &ldev->filter_head);
362 return filt->filter_num;
369 int log_remove_filter(const char *drv_name, int filter_num)
371 struct log_filter *filt;
372 struct log_device *ldev;
374 ldev = log_device_find_by_name(drv_name);
378 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
379 if (filt->filter_num == filter_num) {
380 list_del(&filt->sibling_node);
391 * log_find_device_by_drv() - Find a device by its driver
394 * Return: Device associated with that driver, or NULL if not found
396 static struct log_device *log_find_device_by_drv(struct log_driver *drv)
398 struct log_device *ldev;
400 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
401 if (ldev->drv == drv)
405 * It is quite hard to pass an invalid driver since passing an unknown
406 * LOG_GET_DRIVER(xxx) would normally produce a compilation error. But
407 * it is possible to pass NULL, for example, so this
413 int log_device_set_enable(struct log_driver *drv, bool enable)
415 struct log_device *ldev;
417 ldev = log_find_device_by_drv(drv);
421 ldev->flags |= LOGDF_ENABLE;
423 ldev->flags &= ~LOGDF_ENABLE;
430 struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
431 const int count = ll_entry_count(struct log_driver, log_driver);
432 struct log_driver *end = drv + count;
435 * We cannot add runtime data to the driver since it is likely stored
436 * in rodata. Instead, set up a 'device' corresponding to each driver.
437 * We only support having a single device.
439 INIT_LIST_HEAD((struct list_head *)&gd->log_head);
441 struct log_device *ldev;
443 ldev = calloc(1, sizeof(*ldev));
445 debug("%s: Cannot allocate memory\n", __func__);
448 INIT_LIST_HEAD(&ldev->filter_head);
450 ldev->flags = drv->flags;
451 list_add_tail(&ldev->sibling_node,
452 (struct list_head *)&gd->log_head);
455 gd->flags |= GD_FLG_LOG_READY;
456 if (!gd->default_log_level)
457 gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
458 gd->log_fmt = log_get_default_format();
459 gd->logc_prev = LOGC_NONE;
460 gd->logl_prev = LOGL_INFO;