1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2017 Google, Inc
10 #include <display_options.h>
13 #include <asm/global_data.h>
14 #include <dm/uclass.h>
16 DECLARE_GLOBAL_DATA_PTR;
18 static const char *const log_cat_name[] = {
37 _Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,
40 static const char *const log_level_name[] = {
53 _Static_assert(ARRAY_SIZE(log_level_name) == LOGL_COUNT, "log_level_name size");
55 /* All error responses MUST begin with '<' */
56 const char *log_get_cat_name(enum log_category_t cat)
60 if (cat < 0 || cat >= LOGC_COUNT)
63 return log_cat_name[cat - LOGC_NONE];
65 #if CONFIG_IS_ENABLED(DM)
66 name = uclass_get_name((enum uclass_id)cat);
71 return name ? name : "<missing>";
74 enum log_category_t log_get_cat_by_name(const char *name)
79 for (i = LOGC_NONE; i < LOGC_COUNT; i++)
80 if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
82 id = uclass_get_by_name(name);
83 if (id != UCLASS_INVALID)
84 return (enum log_category_t)id;
89 const char *log_get_level_name(enum log_level_t level)
91 if (level >= LOGL_COUNT)
93 return log_level_name[level];
96 enum log_level_t log_get_level_by_name(const char *name)
100 for (i = 0; i < LOGL_COUNT; i++) {
101 if (!strcasecmp(log_level_name[i], name))
108 struct log_device *log_device_find_by_name(const char *drv_name)
110 struct log_device *ldev;
112 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
113 if (!strcmp(drv_name, ldev->drv->name))
120 bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
124 for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
125 if (cat_list[i] == cat)
132 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 (rec->flags & LOGRECF_FORCE_DEBUG)
163 /* If there are no filters, filter on the default log level */
164 if (list_empty(&ldev->filter_head)) {
165 if (rec->level > gd->default_log_level)
170 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
171 if (filt->flags & LOGFF_LEVEL_MIN) {
172 if (rec->level < filt->level)
174 } else if (rec->level > filt->level) {
178 if ((filt->flags & LOGFF_HAS_CAT) &&
179 !log_has_cat(filt->cat_list, rec->cat))
182 if (filt->file_list &&
183 !log_has_file(filt->file_list, rec->file))
186 if (filt->flags & LOGFF_DENY)
196 * log_dispatch() - Send a log record to all log devices for processing
198 * The log record is sent to each log device in turn, skipping those which have
199 * filters which block the record.
201 * All log messages created while processing log record @rec are ignored.
203 * @rec: log record to dispatch
204 * Return: 0 msg sent, 1 msg not sent while already dispatching another msg
206 static int log_dispatch(struct log_rec *rec, const char *fmt, va_list args)
208 struct log_device *ldev;
209 char buf[CONFIG_SYS_CBSIZE];
212 * When a log driver writes messages (e.g. via the network stack) this
213 * may result in further generated messages. We cannot process them here
214 * as this might result in infinite recursion.
216 if (gd->processing_msg)
220 gd->processing_msg = true;
221 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
222 if ((ldev->flags & LOGDF_ENABLE) &&
223 log_passes_filters(ldev, rec)) {
227 len = vsnprintf(buf, sizeof(buf), fmt, args);
229 gd->log_cont = len && buf[len - 1] != '\n';
231 ldev->drv->emit(ldev, rec);
234 gd->processing_msg = false;
238 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
239 int line, const char *func, const char *fmt, ...)
247 /* Check for message continuation */
248 if (cat == LOGC_CONT)
250 if (level == LOGL_CONT)
251 level = gd->logl_prev;
254 rec.level = level & LOGL_LEVEL_MASK;
256 if (level & LOGL_FORCE_DEBUG)
257 rec.flags |= LOGRECF_FORCE_DEBUG;
259 rec.flags |= LOGRECF_CONT;
265 if (!(gd->flags & GD_FLG_LOG_READY)) {
266 gd->log_drop_count++;
268 /* display dropped traces with console puts and DEBUG_UART */
269 if (rec.level <= CONFIG_LOG_DEFAULT_LEVEL ||
270 rec.flags & LOGRECF_FORCE_DEBUG) {
271 char buf[CONFIG_SYS_CBSIZE];
274 vsnprintf(buf, sizeof(buf), fmt, args);
282 if (!log_dispatch(&rec, fmt, args)) {
284 gd->logl_prev = level;
291 #define MAX_LINE_LENGTH_BYTES 64
292 #define DEFAULT_LINE_LENGTH_BYTES 16
294 int _log_buffer(enum log_category_t cat, enum log_level_t level,
295 const char *file, int line, const char *func, ulong addr,
296 const void *data, uint width, uint count, uint linelen)
298 if (linelen * width > MAX_LINE_LENGTH_BYTES)
299 linelen = MAX_LINE_LENGTH_BYTES / width;
301 linelen = DEFAULT_LINE_LENGTH_BYTES / width;
305 char buf[HEXDUMP_MAX_BUF_LENGTH(width * linelen)];
307 thislinelen = hexdump_line(addr, data, width, count, linelen,
309 assert(thislinelen >= 0);
310 _log(cat, level, file, line, func, "%s\n", buf);
312 /* update references */
313 data += thislinelen * width;
314 addr += thislinelen * width;
315 count -= thislinelen;
321 int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
322 enum log_level_t level, const char *file_list,
325 struct log_filter *filt;
326 struct log_device *ldev;
330 ldev = log_device_find_by_name(drv_name);
333 filt = calloc(1, sizeof(*filt));
339 filt->flags |= LOGFF_HAS_CAT;
341 if (i == ARRAY_SIZE(filt->cat_list)) {
345 filt->cat_list[i] = cat_list[i];
346 if (cat_list[i] == LOGC_END)
352 filt->file_list = strdup(file_list);
353 if (!filt->file_list) {
358 filt->filter_num = ldev->next_filter_num++;
359 /* Add deny filters to the beginning of the list */
360 if (flags & LOGFF_DENY)
361 list_add(&filt->sibling_node, &ldev->filter_head);
363 list_add_tail(&filt->sibling_node, &ldev->filter_head);
365 return filt->filter_num;
372 int log_remove_filter(const char *drv_name, int filter_num)
374 struct log_filter *filt;
375 struct log_device *ldev;
377 ldev = log_device_find_by_name(drv_name);
381 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
382 if (filt->filter_num == filter_num) {
383 list_del(&filt->sibling_node);
394 * log_find_device_by_drv() - Find a device by its driver
397 * Return: Device associated with that driver, or NULL if not found
399 static struct log_device *log_find_device_by_drv(struct log_driver *drv)
401 struct log_device *ldev;
403 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
404 if (ldev->drv == drv)
408 * It is quite hard to pass an invalid driver since passing an unknown
409 * LOG_GET_DRIVER(xxx) would normally produce a compilation error. But
410 * it is possible to pass NULL, for example, so this
416 int log_device_set_enable(struct log_driver *drv, bool enable)
418 struct log_device *ldev;
420 ldev = log_find_device_by_drv(drv);
424 ldev->flags |= LOGDF_ENABLE;
426 ldev->flags &= ~LOGDF_ENABLE;
431 void log_fixup_for_gd_move(struct global_data *new_gd)
433 new_gd->log_head.prev->next = &new_gd->log_head;
438 struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
439 const int count = ll_entry_count(struct log_driver, log_driver);
440 struct log_driver *end = drv + count;
443 * We cannot add runtime data to the driver since it is likely stored
444 * in rodata. Instead, set up a 'device' corresponding to each driver.
445 * We only support having a single device for each driver.
447 INIT_LIST_HEAD((struct list_head *)&gd->log_head);
449 struct log_device *ldev;
451 ldev = calloc(1, sizeof(*ldev));
453 debug("%s: Cannot allocate memory\n", __func__);
456 INIT_LIST_HEAD(&ldev->filter_head);
458 ldev->flags = drv->flags;
459 list_add_tail(&ldev->sibling_node,
460 (struct list_head *)&gd->log_head);
463 gd->flags |= GD_FLG_LOG_READY;
464 if (!gd->default_log_level)
465 gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
466 gd->log_fmt = log_get_default_format();
467 gd->logc_prev = LOGC_NONE;
468 gd->logl_prev = LOGL_INFO;