1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2017 Google, Inc
9 #include <display_options.h>
12 #include <asm/global_data.h>
13 #include <dm/uclass.h>
15 DECLARE_GLOBAL_DATA_PTR;
17 static const char *const log_cat_name[] = {
36 _Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,
39 static const char *const log_level_name[] = {
52 _Static_assert(ARRAY_SIZE(log_level_name) == LOGL_COUNT, "log_level_name size");
54 /* All error responses MUST begin with '<' */
55 const char *log_get_cat_name(enum log_category_t cat)
59 if (cat < 0 || cat >= LOGC_COUNT)
62 return log_cat_name[cat - LOGC_NONE];
64 #if CONFIG_IS_ENABLED(DM)
65 name = uclass_get_name((enum uclass_id)cat);
70 return name ? name : "<missing>";
73 enum log_category_t log_get_cat_by_name(const char *name)
78 for (i = LOGC_NONE; i < LOGC_COUNT; i++)
79 if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
81 id = uclass_get_by_name(name);
82 if (id != UCLASS_INVALID)
83 return (enum log_category_t)id;
88 const char *log_get_level_name(enum log_level_t level)
90 if (level >= LOGL_COUNT)
92 return log_level_name[level];
95 enum log_level_t log_get_level_by_name(const char *name)
99 for (i = 0; i < LOGL_COUNT; i++) {
100 if (!strcasecmp(log_level_name[i], name))
107 struct log_device *log_device_find_by_name(const char *drv_name)
109 struct log_device *ldev;
111 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
112 if (!strcmp(drv_name, ldev->drv->name))
119 bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
123 for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
124 if (cat_list[i] == cat)
131 bool log_has_file(const char *file_list, const char *file)
133 int file_len = strlen(file);
137 for (s = file_list; *s; s = p + (*p != '\0')) {
138 p = strchrnul(s, ',');
140 if (file_len >= substr_len &&
141 !strncmp(file + file_len - substr_len, s, substr_len))
149 * log_passes_filters() - check if a log record passes the filters for a device
151 * @ldev: Log device to check
152 * @rec: Log record to check
153 * Return: true if @rec is not blocked by the filters in @ldev, false if it is
155 static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
157 struct log_filter *filt;
159 if (rec->flags & LOGRECF_FORCE_DEBUG)
162 /* If there are no filters, filter on the default log level */
163 if (list_empty(&ldev->filter_head)) {
164 if (rec->level > gd->default_log_level)
169 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
170 if (filt->flags & LOGFF_LEVEL_MIN) {
171 if (rec->level < filt->level)
173 } else if (rec->level > filt->level) {
177 if ((filt->flags & LOGFF_HAS_CAT) &&
178 !log_has_cat(filt->cat_list, rec->cat))
181 if (filt->file_list &&
182 !log_has_file(filt->file_list, rec->file))
185 if (filt->flags & LOGFF_DENY)
195 * log_dispatch() - Send a log record to all log devices for processing
197 * The log record is sent to each log device in turn, skipping those which have
198 * filters which block the record.
200 * All log messages created while processing log record @rec are ignored.
202 * @rec: log record to dispatch
203 * Return: 0 msg sent, 1 msg not sent while already dispatching another msg
205 static int log_dispatch(struct log_rec *rec, const char *fmt, va_list args)
207 struct log_device *ldev;
208 char buf[CONFIG_SYS_CBSIZE];
211 * When a log driver writes messages (e.g. via the network stack) this
212 * may result in further generated messages. We cannot process them here
213 * as this might result in infinite recursion.
215 if (gd->processing_msg)
219 gd->processing_msg = true;
220 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
221 if ((ldev->flags & LOGDF_ENABLE) &&
222 log_passes_filters(ldev, rec)) {
226 len = vsnprintf(buf, sizeof(buf), fmt, args);
228 gd->log_cont = len && buf[len - 1] != '\n';
230 ldev->drv->emit(ldev, rec);
233 gd->processing_msg = false;
237 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
238 int line, const char *func, const char *fmt, ...)
246 /* Check for message continuation */
247 if (cat == LOGC_CONT)
249 if (level == LOGL_CONT)
250 level = gd->logl_prev;
253 rec.level = level & LOGL_LEVEL_MASK;
255 if (level & LOGL_FORCE_DEBUG)
256 rec.flags |= LOGRECF_FORCE_DEBUG;
258 rec.flags |= LOGRECF_CONT;
264 if (!(gd->flags & GD_FLG_LOG_READY)) {
265 gd->log_drop_count++;
267 /* display dropped traces with console puts and DEBUG_UART */
268 if (rec.level <= CONFIG_LOG_DEFAULT_LEVEL ||
269 rec.flags & LOGRECF_FORCE_DEBUG) {
270 char buf[CONFIG_SYS_CBSIZE];
273 vsnprintf(buf, sizeof(buf), fmt, args);
281 if (!log_dispatch(&rec, fmt, args)) {
283 gd->logl_prev = level;
290 #define MAX_LINE_LENGTH_BYTES 64
291 #define DEFAULT_LINE_LENGTH_BYTES 16
293 int _log_buffer(enum log_category_t cat, enum log_level_t level,
294 const char *file, int line, const char *func, ulong addr,
295 const void *data, uint width, uint count, uint linelen)
297 if (linelen * width > MAX_LINE_LENGTH_BYTES)
298 linelen = MAX_LINE_LENGTH_BYTES / width;
300 linelen = DEFAULT_LINE_LENGTH_BYTES / width;
304 char buf[HEXDUMP_MAX_BUF_LENGTH(width * linelen)];
306 thislinelen = hexdump_line(addr, data, width, count, linelen,
308 assert(thislinelen >= 0);
309 _log(cat, level, file, line, func, "%s\n", buf);
311 /* update references */
312 data += thislinelen * width;
313 addr += thislinelen * width;
314 count -= thislinelen;
320 int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
321 enum log_level_t level, const char *file_list,
324 struct log_filter *filt;
325 struct log_device *ldev;
329 ldev = log_device_find_by_name(drv_name);
332 filt = calloc(1, sizeof(*filt));
338 filt->flags |= LOGFF_HAS_CAT;
340 if (i == ARRAY_SIZE(filt->cat_list)) {
344 filt->cat_list[i] = cat_list[i];
345 if (cat_list[i] == LOGC_END)
351 filt->file_list = strdup(file_list);
352 if (!filt->file_list) {
357 filt->filter_num = ldev->next_filter_num++;
358 /* Add deny filters to the beginning of the list */
359 if (flags & LOGFF_DENY)
360 list_add(&filt->sibling_node, &ldev->filter_head);
362 list_add_tail(&filt->sibling_node, &ldev->filter_head);
364 return filt->filter_num;
371 int log_remove_filter(const char *drv_name, int filter_num)
373 struct log_filter *filt;
374 struct log_device *ldev;
376 ldev = log_device_find_by_name(drv_name);
380 list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
381 if (filt->filter_num == filter_num) {
382 list_del(&filt->sibling_node);
393 * log_find_device_by_drv() - Find a device by its driver
396 * Return: Device associated with that driver, or NULL if not found
398 static struct log_device *log_find_device_by_drv(struct log_driver *drv)
400 struct log_device *ldev;
402 list_for_each_entry(ldev, &gd->log_head, sibling_node) {
403 if (ldev->drv == drv)
407 * It is quite hard to pass an invalid driver since passing an unknown
408 * LOG_GET_DRIVER(xxx) would normally produce a compilation error. But
409 * it is possible to pass NULL, for example, so this
415 int log_device_set_enable(struct log_driver *drv, bool enable)
417 struct log_device *ldev;
419 ldev = log_find_device_by_drv(drv);
423 ldev->flags |= LOGDF_ENABLE;
425 ldev->flags &= ~LOGDF_ENABLE;
430 void log_fixup_for_gd_move(struct global_data *new_gd)
432 new_gd->log_head.prev->next = &new_gd->log_head;
437 struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
438 const int count = ll_entry_count(struct log_driver, log_driver);
439 struct log_driver *end = drv + count;
442 * We cannot add runtime data to the driver since it is likely stored
443 * in rodata. Instead, set up a 'device' corresponding to each driver.
444 * We only support having a single device for each driver.
446 INIT_LIST_HEAD((struct list_head *)&gd->log_head);
448 struct log_device *ldev;
450 ldev = calloc(1, sizeof(*ldev));
452 debug("%s: Cannot allocate memory\n", __func__);
455 INIT_LIST_HEAD(&ldev->filter_head);
457 ldev->flags = drv->flags;
458 list_add_tail(&ldev->sibling_node,
459 (struct list_head *)&gd->log_head);
462 gd->flags |= GD_FLG_LOG_READY;
463 if (!gd->default_log_level)
464 gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
465 gd->log_fmt = log_get_default_format();
466 gd->logc_prev = LOGC_NONE;
467 gd->logl_prev = LOGL_INFO;