[u-boot.git] / common / log.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Logging support
 *
 * Copyright (c) 2017 Google, Inc
 * Written by Simon Glass <[email protected]>
 */

#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->flags & LOGRECF_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) {
				int len;

				len = vsnprintf(buf, sizeof(buf), fmt, args);
				rec->msg = buf;
				gd->log_cont = len && buf[len - 1] != '\n';
			}
			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.flags = 0;
	if (level & LOGL_FORCE_DEBUG)
		rec.flags |= LOGRECF_FORCE_DEBUG;
	if (gd->log_cont)
		rec.flags |= LOGRECF_CONT;
	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.flags & LOGRECF_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;
}
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
e9c8d49d SG	2	/*
	3	* Logging support
	4	*
	5	* Copyright (c) 2017 Google, Inc
	6	* Written by Simon Glass <[email protected]>
e9c8d49d SG	7	*/
	8
	9	#include <common.h>
	10	#include <log.h>
	11	#include <malloc.h>
401d1c4f	12	#include <asm/global_data.h>
f941c8d7	13	#include <dm/uclass.h>
e9c8d49d SG	14
	15	DECLARE_GLOBAL_DATA_PTR;
	16
43381401	17	static const char *const log_cat_name[] = {
f941c8d7 SG	18	"none",
	19	"arch",
	20	"board",
	21	"core",
	22	"driver-model",
	23	"device-tree",
1973b381	24	"efi",
8021296a SG	25	"alloc",
	26	"sandbox",
	27	"bloblist",
	28	"devres",
	29	"acpi",
b73d61a5	30	"boot",
f941c8d7 SG	31	};
f941c8d7 SG	32
2a0cbf3b HS	33	_Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,
	34	"log_cat_name size");
	35
43381401	36	static const char *const log_level_name[] = {
f941c8d7 SG	37	"EMERG",
	38	"ALERT",
	39	"CRIT",
	40	"ERR",
	41	"WARNING",
	42	"NOTICE",
	43	"INFO",
	44	"DEBUG",
	45	"CONTENT",
	46	"IO",
	47	};
	48
2a0cbf3b HS	49	_Static_assert(ARRAY_SIZE(log_level_name) == LOGL_COUNT, "log_level_name size");
	50
	51	/* All error responses MUST begin with '<' */
f941c8d7 SG	52	const char *log_get_cat_name(enum log_category_t cat)
f941c8d7 SG	53	{
c2e4e7e6 SG	54	const char *name;
	55
	56	if (cat < 0 \|\| cat >= LOGC_COUNT)
	57	return "<invalid>";
f941c8d7 SG	58	if (cat >= LOGC_NONE)
	59	return log_cat_name[cat - LOGC_NONE];
	60
6c9e4175	61	#if CONFIG_IS_ENABLED(DM)
c2e4e7e6	62	name = uclass_get_name((enum uclass_id)cat);
6c9e4175 HS	63	#else
	64	name = NULL;
	65	#endif
c2e4e7e6 SG	66
c2e4e7e6 SG	67	return name ? name : "<missing>";
f941c8d7 SG	68	}
	69
	70	enum log_category_t log_get_cat_by_name(const char *name)
	71	{
	72	enum uclass_id id;
	73	int i;
	74
	75	for (i = LOGC_NONE; i < LOGC_COUNT; i++)
	76	if (!strcmp(name, log_cat_name[i - LOGC_NONE]))
	77	return i;
	78	id = uclass_get_by_name(name);
	79	if (id != UCLASS_INVALID)
	80	return (enum log_category_t)id;
	81
	82	return LOGC_NONE;
	83	}
	84
	85	const char *log_get_level_name(enum log_level_t level)
	86	{
	87	if (level >= LOGL_COUNT)
	88	return "INVALID";
	89	return log_level_name[level];
	90	}
	91
	92	enum log_level_t log_get_level_by_name(const char *name)
	93	{
	94	int i;
	95
	96	for (i = 0; i < LOGL_COUNT; i++) {
	97	if (!strcasecmp(log_level_name[i], name))
	98	return i;
	99	}
	100
	101	return LOGL_NONE;
	102	}
	103
3102c1d2	104	struct log_device log_device_find_by_name(const char drv_name)
e9c8d49d SG	105	{
	106	struct log_device *ldev;
	107
	108	list_for_each_entry(ldev, &gd->log_head, sibling_node) {
	109	if (!strcmp(drv_name, ldev->drv->name))
	110	return ldev;
	111	}
	112
	113	return NULL;
	114	}
	115
3102c1d2	116	bool log_has_cat(enum log_category_t cat_list[], enum log_category_t cat)
e9c8d49d SG	117	{
	118	int i;
	119
	120	for (i = 0; i < LOGF_MAX_CATEGORIES && cat_list[i] != LOGC_END; i++) {
	121	if (cat_list[i] == cat)
	122	return true;
	123	}
	124
	125	return false;
	126	}
	127
3102c1d2	128	bool log_has_file(const char file_list, const char file)
e9c8d49d SG	129	{
	130	int file_len = strlen(file);
	131	const char s, p;
	132	int substr_len;
	133
	134	for (s = file_list; s; s = p + (p != '\0')) {
	135	p = strchrnul(s, ',');
	136	substr_len = p - s;
	137	if (file_len >= substr_len &&
	138	!strncmp(file + file_len - substr_len, s, substr_len))
	139	return true;
	140	}
	141
	142	return false;
	143	}
	144
	145	/**
	146	* log_passes_filters() - check if a log record passes the filters for a device
	147	*
	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
	151	*/
	152	static bool log_passes_filters(struct log_device ldev, struct log_rec rec)
	153	{
	154	struct log_filter *filt;
	155
79d5983b	156	if (rec->flags & LOGRECF_FORCE_DEBUG)
52d3df7f SG	157	return true;
52d3df7f SG	158
e9c8d49d SG	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)
	162	return false;
	163	return true;
	164	}
	165
	166	list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
40455a69 SA	167	if (filt->flags & LOGFF_LEVEL_MIN) {
	168	if (rec->level < filt->level)
	169	continue;
	170	} else if (rec->level > filt->level) {
e9c8d49d	171	continue;
40455a69 SA	172	}
40455a69 SA	173
e9c8d49d SG	174	if ((filt->flags & LOGFF_HAS_CAT) &&
	175	!log_has_cat(filt->cat_list, rec->cat))
	176	continue;
40455a69	177
e9c8d49d SG	178	if (filt->file_list &&
	179	!log_has_file(filt->file_list, rec->file))
	180	continue;
fe3b1a2d SA	181
	182	if (filt->flags & LOGFF_DENY)
	183	return false;
	184	else
	185	return true;
e9c8d49d SG	186	}
	187
	188	return false;
	189	}
	190
	191	/**
	192	* log_dispatch() - Send a log record to all log devices for processing
	193	*
	194	* The log record is sent to each log device in turn, skipping those which have
d094a073	195	* filters which block the record.
e9c8d49d	196	*
d094a073 HS	197	* All log messages created while processing log record @rec are ignored.
	198	*
	199	* @rec: log record to dispatch
	200	* Return: 0 msg sent, 1 msg not sent while already dispatching another msg
e9c8d49d	201	*/
c698b998	202	static int log_dispatch(struct log_rec rec, const char fmt, va_list args)
e9c8d49d SG	203	{
e9c8d49d SG	204	struct log_device *ldev;
c698b998	205	char buf[CONFIG_SYS_CBSIZE];
e5b35f70 HS	206
	207	/*
	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.
	211	*/
993a06b6	212	if (gd->processing_msg)
d094a073	213	return 1;
e5b35f70 HS	214
e5b35f70 HS	215	/* Emit message */
993a06b6	216	gd->processing_msg = true;
e9c8d49d	217	list_for_each_entry(ldev, &gd->log_head, sibling_node) {
b4520300	218	if ((ldev->flags & LOGDF_ENABLE) &&
c698b998 PD	219	log_passes_filters(ldev, rec)) {
c698b998 PD	220	if (!rec->msg) {
9ad7a6c2 SG	221	int len;
	222
	223	len = vsnprintf(buf, sizeof(buf), fmt, args);
c698b998	224	rec->msg = buf;
9ad7a6c2	225	gd->log_cont = len && buf[len - 1] != '\n';
c698b998	226	}
e9c8d49d	227	ldev->drv->emit(ldev, rec);
c698b998	228	}
e9c8d49d	229	}
993a06b6	230	gd->processing_msg = false;
e9c8d49d SG	231	return 0;
	232	}
	233
	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, ...)
	236	{
e9c8d49d SG	237	struct log_rec rec;
	238	va_list args;
	239
f0e90e0e PD	240	if (!gd)
	241	return -ENOSYS;
	242
d094a073 HS	243	/* Check for message continuation */
	244	if (cat == LOGC_CONT)
	245	cat = gd->logc_prev;
	246	if (level == LOGL_CONT)
	247	level = gd->logl_prev;
	248
e9c8d49d	249	rec.cat = cat;
52d3df7f	250	rec.level = level & LOGL_LEVEL_MASK;
79d5983b SG	251	rec.flags = 0;
	252	if (level & LOGL_FORCE_DEBUG)
	253	rec.flags \|= LOGRECF_FORCE_DEBUG;
9ad7a6c2 SG	254	if (gd->log_cont)
9ad7a6c2 SG	255	rec.flags \|= LOGRECF_CONT;
e9c8d49d SG	256	rec.file = file;
	257	rec.line = line;
	258	rec.func = func;
c698b998	259	rec.msg = NULL;
f0e90e0e PD	260
	261	if (!(gd->flags & GD_FLG_LOG_READY)) {
	262	gd->log_drop_count++;
dd500134 PD	263
dd500134 PD	264	/* display dropped traces with console puts and DEBUG_UART */
79d5983b SG	265	if (rec.level <= CONFIG_LOG_DEFAULT_LEVEL \|\|
79d5983b SG	266	rec.flags & LOGRECF_FORCE_DEBUG) {
c698b998 PD	267	char buf[CONFIG_SYS_CBSIZE];
c698b998 PD	268
dd500134 PD	269	va_start(args, fmt);
	270	vsnprintf(buf, sizeof(buf), fmt, args);
	271	puts(buf);
	272	va_end(args);
	273	}
	274
f0e90e0e PD	275	return -ENOSYS;
f0e90e0e PD	276	}
e9c8d49d	277	va_start(args, fmt);
c698b998	278	if (!log_dispatch(&rec, fmt, args)) {
d094a073 HS	279	gd->logc_prev = cat;
	280	gd->logl_prev = level;
	281	}
c698b998	282	va_end(args);
e9c8d49d SG	283
	284	return 0;
	285	}
	286
a02f84ee	287	int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
40455a69	288	enum log_level_t level, const char *file_list,
a02f84ee	289	int flags)
e9c8d49d SG	290	{
	291	struct log_filter *filt;
	292	struct log_device *ldev;
45fac9fc	293	int ret;
e9c8d49d SG	294	int i;
	295
	296	ldev = log_device_find_by_name(drv_name);
	297	if (!ldev)
	298	return -ENOENT;
c1f39edc	299	filt = calloc(1, sizeof(*filt));
e9c8d49d SG	300	if (!filt)
	301	return -ENOMEM;
	302
a02f84ee	303	filt->flags = flags;
e9c8d49d SG	304	if (cat_list) {
	305	filt->flags \|= LOGFF_HAS_CAT;
	306	for (i = 0; ; i++) {
45fac9fc SG	307	if (i == ARRAY_SIZE(filt->cat_list)) {
	308	ret = -ENOSPC;
	309	goto err;
	310	}
e9c8d49d SG	311	filt->cat_list[i] = cat_list[i];
	312	if (cat_list[i] == LOGC_END)
	313	break;
	314	}
	315	}
40455a69	316	filt->level = level;
e9c8d49d SG	317	if (file_list) {
e9c8d49d SG	318	filt->file_list = strdup(file_list);
45fac9fc	319	if (!filt->file_list) {
69529f98	320	ret = -ENOMEM;
45fac9fc SG	321	goto err;
45fac9fc SG	322	}
e9c8d49d SG	323	}
e9c8d49d SG	324	filt->filter_num = ldev->next_filter_num++;
fe3b1a2d SA	325	/* Add deny filters to the beginning of the list */
	326	if (flags & LOGFF_DENY)
	327	list_add(&filt->sibling_node, &ldev->filter_head);
	328	else
	329	list_add_tail(&filt->sibling_node, &ldev->filter_head);
e9c8d49d SG	330
	331	return filt->filter_num;
	332
45fac9fc	333	err:
e9c8d49d	334	free(filt);
45fac9fc	335	return ret;
e9c8d49d SG	336	}
	337
	338	int log_remove_filter(const char *drv_name, int filter_num)
	339	{
	340	struct log_filter *filt;
	341	struct log_device *ldev;
	342
	343	ldev = log_device_find_by_name(drv_name);
	344	if (!ldev)
	345	return -ENOENT;
	346
	347	list_for_each_entry(filt, &ldev->filter_head, sibling_node) {
	348	if (filt->filter_num == filter_num) {
	349	list_del(&filt->sibling_node);
	350	free(filt);
	351
	352	return 0;
	353	}
	354	}
	355
	356	return -ENOENT;
	357	}
	358
3d03ab63 SG	359	/**
	360	* log_find_device_by_drv() - Find a device by its driver
	361	*
	362	* @drv: Log driver
	363	* @return Device associated with that driver, or NULL if not found
	364	*/
	365	static struct log_device log_find_device_by_drv(struct log_driver drv)
	366	{
	367	struct log_device *ldev;
	368
	369	list_for_each_entry(ldev, &gd->log_head, sibling_node) {
	370	if (ldev->drv == drv)
	371	return ldev;
	372	}
	373	/*
	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
	377	*/
	378
	379	return NULL;
	380	}
	381
	382	int log_device_set_enable(struct log_driver *drv, bool enable)
	383	{
	384	struct log_device *ldev;
	385
	386	ldev = log_find_device_by_drv(drv);
	387	if (!ldev)
	388	return -ENOENT;
	389	if (enable)
	390	ldev->flags \|= LOGDF_ENABLE;
	391	else
	392	ldev->flags &= ~LOGDF_ENABLE;
	393
	394	return 0;
	395	}
	396
e9c8d49d SG	397	int log_init(void)
	398	{
	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;
	402
	403	/*
	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.
	407	*/
	408	INIT_LIST_HEAD((struct list_head *)&gd->log_head);
	409	while (drv < end) {
	410	struct log_device *ldev;
	411
	412	ldev = calloc(1, sizeof(*ldev));
	413	if (!ldev) {
	414	debug("%s: Cannot allocate memory\n", __func__);
	415	return -ENOMEM;
	416	}
	417	INIT_LIST_HEAD(&ldev->filter_head);
	418	ldev->drv = drv;
b4520300	419	ldev->flags = drv->flags;
e9c8d49d SG	420	list_add_tail(&ldev->sibling_node,
	421	(struct list_head *)&gd->log_head);
	422	drv++;
	423	}
af1bc0cf	424	gd->flags \|= GD_FLG_LOG_READY;
2b1dc29a	425	if (!gd->default_log_level)
f0b05c95	426	gd->default_log_level = CONFIG_LOG_DEFAULT_LEVEL;
3c21d773	427	gd->log_fmt = log_get_default_format();
d094a073 HS	428	gd->logc_prev = LOGC_NONE;
d094a073 HS	429	gd->logl_prev = LOGL_INFO;
e9c8d49d SG	430
	431	return 0;
	432	}