summaryrefslogtreecommitdiff
path: root/common/log.c
blob: 6b0034c3ba2e258a073a5c12d657247c35e3aebb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
// SPDX-License-Identifier: GPL-2.0+
/*
 * Logging support
 *
 * Copyright (c) 2017 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <common.h>
#include <log.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <dm/uclass.h>

DECLARE_GLOBAL_DATA_PTR;

static const char *const log_cat_name[] = {
	"none",
	"arch",
	"board",
	"core",
	"driver-model",
	"device-tree",
	"efi",
	"alloc",
	"sandbox",
	"bloblist",
	"devres",
	"acpi",
	"boot",
};

_Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,
	       "log_cat_name size");

static const char *const log_level_name[] = {
	"EMERG",
	"ALERT",
	"CRIT",
	"ERR",
	"WARNING",
	"NOTICE",
	"INFO",
	"DEBUG",
	"CONTENT",
	"IO",
};

_Static_assert(ARRAY_SIZE(log_level_name) == LOGL_COUNT, "log_level_name size");

/* All error responses MUST begin with '<' */
const char *log_get_cat_name(enum log_category_t cat)
{
	const char *name;

	if (cat < 0 || cat >= LOGC_COUNT)
		return "<invalid>";
	if (cat >= LOGC_NONE)
		return log_cat_name[cat - LOGC_NONE];

#if CONFIG_IS_ENABLED(DM)
	name = uclass_get_name((enum uclass_id)cat);
#else
	name = NULL;
#endif

	return name ? name : "<missing>";
}

enum log_category_t log_get_cat_by_name(const char *name)
{
	enum uclass_id id;
	int i;

	for (i = LOGC_NONE; i < LOGC_COUNT; i++)
		if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
			return i;
	id = uclass_get_by_name(name);
	if (id != UCLASS_INVALID)
		return (enum log_category_t)id;

	return LOGC_NONE;
}

const char *log_get_level_name(enum log_level_t level)
{
	if (level >= LOGL_COUNT)
		return "INVALID";
	return log_level_name[level];
}

enum log_level_t log_get_level_by_name(const char *name)
{
	int i;

	for (i = 0; i < LOGL_COUNT; i++) {
		if (!strcasecmp(log_level_name[i], name))
			return i;
	}

	return LOGL_NONE;
}

struct log_device *log_device_find_by_name(const char *drv_name)
{
	struct log_device *ldev;

	list_for_each_entry(ldev, &gd->log_head, sibling_node) {
		if (!strcmp(drv_name, ldev->drv->name))
			return ldev;
	}

	return NULL;
}

bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
{
	int i;

	for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
		if (cat_list[i] == cat)
			return true;
	}

	return false;
}

bool log_has_file(const char *file_list, const char *file)
{
	int file_len = strlen(file);
	const char *s, *p;
	int substr_len;

	for (s = file_list; *s; s = p + (*p != '\0')) {
		p = strchrnul(s, ',');
		substr_len = p - s;
		if (file_len >= substr_len &&
		    !strncmp(file + file_len - substr_len, s, substr_len))
			return true;
	}

	return false;
}

/**
 * log_passes_filters() - check if a log record passes the filters for a device
 *
 * @ldev: Log device to check
 * @rec: Log record to check
 * @return true if @rec is not blocked by the filters in @ldev, false if it is
 */
static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec)
{
	struct log_filter *filt;

	if (rec->force_debug)
		return true;

	/* If there are no filters, filter on the default log level */
	if (list_empty(&ldev->filter_head)) {
		if (rec->level > gd->default_log_level)
			return false;
		return true;
	}

	list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
		if (filt->flags & LOGFF_LEVEL_MIN) {
			if (rec->level < filt->level)
				continue;
		} else if (rec->level > filt->level) {
			continue;
		}

		if ((filt->flags & LOGFF_HAS_CAT) &&
		    !log_has_cat(filt->cat_list, rec->cat))
			continue;

		if (filt->file_list &&
		    !log_has_file(filt->file_list, rec->file))
			continue;

		if (filt->flags & LOGFF_DENY)
			return false;
		else
			return true;
	}

	return false;
}

/**
 * log_dispatch() - Send a log record to all log devices for processing
 *
 * The log record is sent to each log device in turn, skipping those which have
 * filters which block the record.
 *
 * All log messages created while processing log record @rec are ignored.
 *
 * @rec:	log record to dispatch
 * Return:	0 msg sent, 1 msg not sent while already dispatching another msg
 */
static int log_dispatch(struct log_rec *rec, const char *fmt, va_list args)
{
	struct log_device *ldev;
	char buf[CONFIG_SYS_CBSIZE];

	/*
	 * When a log driver writes messages (e.g. via the network stack) this
	 * may result in further generated messages. We cannot process them here
	 * as this might result in infinite recursion.
	 */
	if (gd->processing_msg)
		return 1;

	/* Emit message */
	gd->processing_msg = true;
	list_for_each_entry(ldev, &gd->log_head, sibling_node) {
		if ((ldev->flags & LOGDF_ENABLE) &&
		    log_passes_filters(ldev, rec)) {
			if (!rec->msg) {
				vsnprintf(buf, sizeof(buf), fmt, args);
				rec->msg = buf;
			}
			ldev->drv->emit(ldev, rec);
		}
	}
	gd->processing_msg = false;
	return 0;
}

int _log(enum log_category_t cat, enum log_level_t level, const char *file,
	 int line, const char *func, const char *fmt, ...)
{
	struct log_rec rec;
	va_list args;

	if (!gd)
		return -ENOSYS;

	/* Check for message continuation */
	if (cat == LOGC_CONT)
		cat = gd->logc_prev;
	if (level == LOGL_CONT)
		level = gd->logl_prev;

	rec.cat = cat;
	rec.level = level & LOGL_LEVEL_MASK;
	rec.force_debug = level & LOGL_FORCE_DEBUG;
	rec.file = file;
	rec.line = line;
	rec.func = func;
	rec.msg = NULL;

	if (!(gd->flags & GD_FLG_LOG_READY)) {
		gd->log_drop_count++;

		/* display dropped traces with console puts and DEBUG_UART */
		if (rec.level <= CONFIG_LOG_DEFAULT_LEVEL || rec.force_debug) {
			char buf[CONFIG_SYS_CBSIZE];

			va_start(args, fmt);
			vsnprintf(buf, sizeof(buf), fmt, args);
			puts(buf);
			va_end(args);
		}

		return -ENOSYS;
	}
	va_start(args, fmt);
	if (!log_dispatch(&rec, fmt, args)) {
		gd->logc_prev = cat;
		gd->logl_prev = level;
	}
	va_end(args);

	return 0;
}

int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
			 enum log_level_t level, const char *file_list,
			 int flags)
{
	struct log_filter *filt;
	struct log_device *ldev;
	int ret;
	int i;

	ldev = log_device_find_by_name(drv_name);
	if (!ldev)
		return -ENOENT;
	filt = calloc(1, sizeof(*filt));
	if (!filt)
		return -ENOMEM;

	filt->flags = flags;
	if (cat_list) {
		filt->flags |= LOGFF_HAS_CAT;
		for (i = 0; ; i++) {
			if (i == ARRAY_SIZE(filt->cat_list)) {
				ret = -ENOSPC;
				goto err;
			}
			filt->cat_list[i] = cat_list[i];
			if (cat_list[i] == LOGC_END)
				break;
		}
	}
	filt->level = level;
	if (file_list) {
		filt->file_list = strdup(file_list);
		if (!filt->file_list) {
			ret = -ENOMEM;
			goto err;
		}
	}
	filt->filter_num = ldev->next_filter_num++;
	/* Add deny filters to the beginning of the list */
	if (flags & LOGFF_DENY)
		list_add(&filt->sibling_node, &ldev->filter_head);
	else
		list_add_tail(&filt->sibling_node, &ldev->filter_head);

	return filt->filter_num;

err:
	free(filt);
	return ret;
}

int log_remove_filter(const char *drv_name, int filter_num)
{
	struct log_filter *filt;
	struct log_device *ldev;

	ldev = log_device_find_by_name(drv_name);
	if (!ldev)
		return -ENOENT;

	list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
		if (filt->filter_num == filter_num) {
			list_del(&filt->sibling_node);
			free(filt);

			return 0;
		}
	}

	return -ENOENT;
}

/**
 * log_find_device_by_drv() - Find a device by its driver
 *
 * @drv: Log driver
 * @return Device associated with that driver, or NULL if not found
 */
static struct log_device *log_find_device_by_drv(struct log_driver *drv)
{
	struct log_device *ldev;

	list_for_each_entry(ldev, &gd->log_head, sibling_node) {
		if (ldev->drv == drv)
			return ldev;
	}
	/*
	 * It is quite hard to pass an invalid driver since passing an unknown
	 * LOG_GET_DRIVER(xxx) would normally produce a compilation error. But
	 * it is possible to pass NULL, for example, so this
	 */

	return NULL;
}

int log_device_set_enable(struct log_driver *drv, bool enable)
{
	struct log_device *ldev;

	ldev = log_find_device_by_drv(drv);
	if (!ldev)
		return -ENOENT;
	if (enable)
		ldev->flags |= LOGDF_ENABLE;
	else
		ldev->flags &= ~LOGDF_ENABLE;

	return 0;
}

int log_init(void)
{
	struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);
	const int count = ll_entry_count(struct log_driver, log_driver);
	struct log_driver *end = drv + count;

	/*
	 * We cannot add runtime data to the driver since it is likely stored
	 * in rodata. Instead, set up a 'device' corresponding to each driver.
	 * We only support having a single device.
	 */
	INIT_LIST_HEAD((struct list_head *)&gd->log_head);
	while (drv < end) {
		struct log_device *ldev;

		ldev = calloc(1, sizeof(*ldev));
		if (!ldev) {
			debug("%s: Cannot allocate memory\n", __func__);
			return -ENOMEM;
		}
		INIT_LIST_HEAD(&ldev->filter_head);
		ldev->drv = drv;
		ldev->flags = drv->flags;
		list_add_tail(&ldev->sibling_node,
			      (struct list_head *)&gd->log_head);
		drv++;
	}
	gd->flags |= GD_FLG_LOG_READY;
	if (!gd->default_log_level)
		gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
	gd->log_fmt = log_get_default_format();
	gd->logc_prev = LOGC_NONE;
	gd->logl_prev = LOGL_INFO;

	return 0;
}