[linux-block.git] / drivers / platform / chrome / cros_ec_debugfs.c

/*
 * cros_ec_debugfs - debug logs for Chrome OS EC
 *
 * Copyright 2015 Google, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/circ_buf.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/wait.h>

#define LOG_SHIFT		14
#define LOG_SIZE		(1 << LOG_SHIFT)
#define LOG_POLL_SEC		10

#define CIRC_ADD(idx, size, value)	(((idx) + (value)) & ((size) - 1))

/* struct cros_ec_debugfs - ChromeOS EC debugging information
 *
 * @ec: EC device this debugfs information belongs to
 * @dir: dentry for debugfs files
 * @log_buffer: circular buffer for console log information
 * @read_msg: preallocated EC command and buffer to read console log
 * @log_mutex: mutex to protect circular buffer
 * @log_wq: waitqueue for log readers
 * @log_poll_work: recurring task to poll EC for new console log data
 * @panicinfo_blob: panicinfo debugfs blob
 */
struct cros_ec_debugfs {
	struct cros_ec_dev *ec;
	struct dentry *dir;
	/* EC log */
	struct circ_buf log_buffer;
	struct cros_ec_command *read_msg;
	struct mutex log_mutex;
	wait_queue_head_t log_wq;
	struct delayed_work log_poll_work;
	/* EC panicinfo */
	struct debugfs_blob_wrapper panicinfo_blob;
};

/*
 * We need to make sure that the EC log buffer on the UART is large enough,
 * so that it is unlikely enough to overlow within LOG_POLL_SEC.
 */
static void cros_ec_console_log_work(struct work_struct *__work)
{
	struct cros_ec_debugfs *debug_info =
		container_of(to_delayed_work(__work),
			     struct cros_ec_debugfs,
			     log_poll_work);
	struct cros_ec_dev *ec = debug_info->ec;
	struct circ_buf *cb = &debug_info->log_buffer;
	struct cros_ec_command snapshot_msg = {
		.command = EC_CMD_CONSOLE_SNAPSHOT + ec->cmd_offset,
	};

	struct ec_params_console_read_v1 *read_params =
		(struct ec_params_console_read_v1 *)debug_info->read_msg->data;
	uint8_t *ec_buffer = (uint8_t *)debug_info->read_msg->data;
	int idx;
	int buf_space;
	int ret;

	ret = cros_ec_cmd_xfer(ec->ec_dev, &snapshot_msg);
	if (ret < 0) {
		dev_err(ec->dev, "EC communication failed\n");
		goto resched;
	}
	if (snapshot_msg.result != EC_RES_SUCCESS) {
		dev_err(ec->dev, "EC failed to snapshot the console log\n");
		goto resched;
	}

	/* Loop until we have read everything, or there's an error. */
	mutex_lock(&debug_info->log_mutex);
	buf_space = CIRC_SPACE(cb->head, cb->tail, LOG_SIZE);

	while (1) {
		if (!buf_space) {
			dev_info_once(ec->dev,
				      "Some logs may have been dropped...\n");
			break;
		}

		memset(read_params, '\0', sizeof(*read_params));
		read_params->subcmd = CONSOLE_READ_RECENT;
		ret = cros_ec_cmd_xfer(ec->ec_dev, debug_info->read_msg);
		if (ret < 0) {
			dev_err(ec->dev, "EC communication failed\n");
			break;
		}
		if (debug_info->read_msg->result != EC_RES_SUCCESS) {
			dev_err(ec->dev,
				"EC failed to read the console log\n");
			break;
		}

		/* If the buffer is empty, we're done here. */
		if (ret == 0 || ec_buffer[0] == '\0')
			break;

		idx = 0;
		while (idx < ret && ec_buffer[idx] != '\0' && buf_space > 0) {
			cb->buf[cb->head] = ec_buffer[idx];
			cb->head = CIRC_ADD(cb->head, LOG_SIZE, 1);
			idx++;
			buf_space--;
		}

		wake_up(&debug_info->log_wq);
	}

	mutex_unlock(&debug_info->log_mutex);

resched:
	schedule_delayed_work(&debug_info->log_poll_work,
			      msecs_to_jiffies(LOG_POLL_SEC * 1000));
}

static int cros_ec_console_log_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;

	return nonseekable_open(inode, file);
}

static ssize_t cros_ec_console_log_read(struct file *file, char __user *buf,
					size_t count, loff_t *ppos)
{
	struct cros_ec_debugfs *debug_info = file->private_data;
	struct circ_buf *cb = &debug_info->log_buffer;
	ssize_t ret;

	mutex_lock(&debug_info->log_mutex);

	while (!CIRC_CNT(cb->head, cb->tail, LOG_SIZE)) {
		if (file->f_flags & O_NONBLOCK) {
			ret = -EAGAIN;
			goto error;
		}

		mutex_unlock(&debug_info->log_mutex);

		ret = wait_event_interruptible(debug_info->log_wq,
					CIRC_CNT(cb->head, cb->tail, LOG_SIZE));
		if (ret < 0)
			return ret;

		mutex_lock(&debug_info->log_mutex);
	}

	/* Only copy until the end of the circular buffer, and let userspace
	 * retry to get the rest of the data.
	 */
	ret = min_t(size_t, CIRC_CNT_TO_END(cb->head, cb->tail, LOG_SIZE),
		    count);

	if (copy_to_user(buf, cb->buf + cb->tail, ret)) {
		ret = -EFAULT;
		goto error;
	}

	cb->tail = CIRC_ADD(cb->tail, LOG_SIZE, ret);

error:
	mutex_unlock(&debug_info->log_mutex);
	return ret;
}

static __poll_t cros_ec_console_log_poll(struct file *file,
					     poll_table *wait)
{
	struct cros_ec_debugfs *debug_info = file->private_data;
	__poll_t mask = 0;

	poll_wait(file, &debug_info->log_wq, wait);

	mutex_lock(&debug_info->log_mutex);
	if (CIRC_CNT(debug_info->log_buffer.head,
		     debug_info->log_buffer.tail,
		     LOG_SIZE))
		mask |= EPOLLIN | EPOLLRDNORM;
	mutex_unlock(&debug_info->log_mutex);

	return mask;
}

static int cros_ec_console_log_release(struct inode *inode, struct file *file)
{
	return 0;
}

const struct file_operations cros_ec_console_log_fops = {
	.owner = THIS_MODULE,
	.open = cros_ec_console_log_open,
	.read = cros_ec_console_log_read,
	.llseek = no_llseek,
	.poll = cros_ec_console_log_poll,
	.release = cros_ec_console_log_release,
};

static int ec_read_version_supported(struct cros_ec_dev *ec)
{
	struct ec_params_get_cmd_versions_v1 *params;
	struct ec_response_get_cmd_versions *response;
	int ret;

	struct cros_ec_command *msg;

	msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*response)),
		GFP_KERNEL);
	if (!msg)
		return 0;

	msg->command = EC_CMD_GET_CMD_VERSIONS + ec->cmd_offset;
	msg->outsize = sizeof(*params);
	msg->insize = sizeof(*response);

	params = (struct ec_params_get_cmd_versions_v1 *)msg->data;
	params->cmd = EC_CMD_CONSOLE_READ;
	response = (struct ec_response_get_cmd_versions *)msg->data;

	ret = cros_ec_cmd_xfer(ec->ec_dev, msg) >= 0 &&
		msg->result == EC_RES_SUCCESS &&
		(response->version_mask & EC_VER_MASK(1));

	kfree(msg);

	return ret;
}

static int cros_ec_create_console_log(struct cros_ec_debugfs *debug_info)
{
	struct cros_ec_dev *ec = debug_info->ec;
	char *buf;
	int read_params_size;
	int read_response_size;

	if (!ec_read_version_supported(ec)) {
		dev_warn(ec->dev,
			"device does not support reading the console log\n");
		return 0;
	}

	buf = devm_kzalloc(ec->dev, LOG_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	read_params_size = sizeof(struct ec_params_console_read_v1);
	read_response_size = ec->ec_dev->max_response;
	debug_info->read_msg = devm_kzalloc(ec->dev,
		sizeof(*debug_info->read_msg) +
			max(read_params_size, read_response_size), GFP_KERNEL);
	if (!debug_info->read_msg)
		return -ENOMEM;

	debug_info->read_msg->version = 1;
	debug_info->read_msg->command = EC_CMD_CONSOLE_READ + ec->cmd_offset;
	debug_info->read_msg->outsize = read_params_size;
	debug_info->read_msg->insize = read_response_size;

	debug_info->log_buffer.buf = buf;
	debug_info->log_buffer.head = 0;
	debug_info->log_buffer.tail = 0;

	mutex_init(&debug_info->log_mutex);
	init_waitqueue_head(&debug_info->log_wq);

	if (!debugfs_create_file("console_log",
				 S_IFREG | S_IRUGO,
				 debug_info->dir,
				 debug_info,
				 &cros_ec_console_log_fops))
		return -ENOMEM;

	INIT_DELAYED_WORK(&debug_info->log_poll_work,
			  cros_ec_console_log_work);
	schedule_delayed_work(&debug_info->log_poll_work, 0);

	return 0;
}

static void cros_ec_cleanup_console_log(struct cros_ec_debugfs *debug_info)
{
	if (debug_info->log_buffer.buf) {
		cancel_delayed_work_sync(&debug_info->log_poll_work);
		mutex_destroy(&debug_info->log_mutex);
	}
}

static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info)
{
	struct cros_ec_device *ec_dev = debug_info->ec->ec_dev;
	int ret;
	struct cros_ec_command *msg;
	int insize;

	insize = ec_dev->max_response;

	msg = devm_kzalloc(debug_info->ec->dev,
			sizeof(*msg) + insize, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	msg->command = EC_CMD_GET_PANIC_INFO;
	msg->insize = insize;

	ret = cros_ec_cmd_xfer(ec_dev, msg);
	if (ret < 0) {
		dev_warn(debug_info->ec->dev, "Cannot read panicinfo.\n");
		ret = 0;
		goto free;
	}

	/* No panic data */
	if (ret == 0)
		goto free;

	debug_info->panicinfo_blob.data = msg->data;
	debug_info->panicinfo_blob.size = ret;

	if (!debugfs_create_blob("panicinfo",
				 S_IFREG | S_IRUGO,
				 debug_info->dir,
				 &debug_info->panicinfo_blob)) {
		ret = -ENOMEM;
		goto free;
	}

	return 0;

free:
	devm_kfree(debug_info->ec->dev, msg);
	return ret;
}

int cros_ec_debugfs_init(struct cros_ec_dev *ec)
{
	struct cros_ec_platform *ec_platform = dev_get_platdata(ec->dev);
	const char *name = ec_platform->ec_name;
	struct cros_ec_debugfs *debug_info;
	int ret;

	debug_info = devm_kzalloc(ec->dev, sizeof(*debug_info), GFP_KERNEL);
	if (!debug_info)
		return -ENOMEM;

	debug_info->ec = ec;
	debug_info->dir = debugfs_create_dir(name, NULL);
	if (!debug_info->dir)
		return -ENOMEM;

	ret = cros_ec_create_panicinfo(debug_info);
	if (ret)
		goto remove_debugfs;

	ret = cros_ec_create_console_log(debug_info);
	if (ret)
		goto remove_debugfs;

	ec->debug_info = debug_info;

	return 0;

remove_debugfs:
	debugfs_remove_recursive(debug_info->dir);
	return ret;
}
EXPORT_SYMBOL(cros_ec_debugfs_init);

void cros_ec_debugfs_remove(struct cros_ec_dev *ec)
{
	if (!ec->debug_info)
		return;

	debugfs_remove_recursive(ec->debug_info->dir);
	cros_ec_cleanup_console_log(ec->debug_info);
}
EXPORT_SYMBOL(cros_ec_debugfs_remove);
Commit	Line	Data
e8626459 EC	1	/*
	2	* cros_ec_debugfs - debug logs for Chrome OS EC
	3	*
	4	* Copyright 2015 Google, Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/circ_buf.h>
	21	#include <linux/debugfs.h>
	22	#include <linux/delay.h>
	23	#include <linux/fs.h>
	24	#include <linux/mfd/cros_ec.h>
	25	#include <linux/mfd/cros_ec_commands.h>
	26	#include <linux/mutex.h>
	27	#include <linux/poll.h>
	28	#include <linux/sched.h>
	29	#include <linux/slab.h>
	30	#include <linux/wait.h>
	31
e8626459 EC	32	#define LOG_SHIFT 14
	33	#define LOG_SIZE (1 << LOG_SHIFT)
	34	#define LOG_POLL_SEC 10
	35
	36	#define CIRC_ADD(idx, size, value) (((idx) + (value)) & ((size) - 1))
	37
	38	/* struct cros_ec_debugfs - ChromeOS EC debugging information
	39	*
	40	* @ec: EC device this debugfs information belongs to
	41	* @dir: dentry for debugfs files
	42	* @log_buffer: circular buffer for console log information
	43	* @read_msg: preallocated EC command and buffer to read console log
	44	* @log_mutex: mutex to protect circular buffer
	45	* @log_wq: waitqueue for log readers
	46	* @log_poll_work: recurring task to poll EC for new console log data
6e494106	47	* @panicinfo_blob: panicinfo debugfs blob
e8626459 EC	48	*/
	49	struct cros_ec_debugfs {
	50	struct cros_ec_dev *ec;
	51	struct dentry *dir;
6e494106	52	/* EC log */
e8626459 EC	53	struct circ_buf log_buffer;
	54	struct cros_ec_command *read_msg;
	55	struct mutex log_mutex;
	56	wait_queue_head_t log_wq;
	57	struct delayed_work log_poll_work;
6e494106 NB	58	/* EC panicinfo */
6e494106 NB	59	struct debugfs_blob_wrapper panicinfo_blob;
e8626459 EC	60	};
	61
	62	/*
	63	* We need to make sure that the EC log buffer on the UART is large enough,
	64	* so that it is unlikely enough to overlow within LOG_POLL_SEC.
	65	*/
	66	static void cros_ec_console_log_work(struct work_struct *__work)
	67	{
	68	struct cros_ec_debugfs *debug_info =
	69	container_of(to_delayed_work(__work),
	70	struct cros_ec_debugfs,
	71	log_poll_work);
	72	struct cros_ec_dev *ec = debug_info->ec;
	73	struct circ_buf *cb = &debug_info->log_buffer;
	74	struct cros_ec_command snapshot_msg = {
	75	.command = EC_CMD_CONSOLE_SNAPSHOT + ec->cmd_offset,
	76	};
	77
	78	struct ec_params_console_read_v1 *read_params =
	79	(struct ec_params_console_read_v1 *)debug_info->read_msg->data;
	80	uint8_t ec_buffer = (uint8_t )debug_info->read_msg->data;
	81	int idx;
	82	int buf_space;
	83	int ret;
	84
	85	ret = cros_ec_cmd_xfer(ec->ec_dev, &snapshot_msg);
	86	if (ret < 0) {
	87	dev_err(ec->dev, "EC communication failed\n");
	88	goto resched;
	89	}
	90	if (snapshot_msg.result != EC_RES_SUCCESS) {
	91	dev_err(ec->dev, "EC failed to snapshot the console log\n");
	92	goto resched;
	93	}
	94
	95	/* Loop until we have read everything, or there's an error. */
	96	mutex_lock(&debug_info->log_mutex);
	97	buf_space = CIRC_SPACE(cb->head, cb->tail, LOG_SIZE);
	98
	99	while (1) {
	100	if (!buf_space) {
	101	dev_info_once(ec->dev,
	102	"Some logs may have been dropped...\n");
	103	break;
	104	}
	105
	106	memset(read_params, '\0', sizeof(*read_params));
	107	read_params->subcmd = CONSOLE_READ_RECENT;
	108	ret = cros_ec_cmd_xfer(ec->ec_dev, debug_info->read_msg);
	109	if (ret < 0) {
	110	dev_err(ec->dev, "EC communication failed\n");
	111	break;
	112	}
	113	if (debug_info->read_msg->result != EC_RES_SUCCESS) {
	114	dev_err(ec->dev,
	115	"EC failed to read the console log\n");
	116	break;
	117	}
	118
	119	/* If the buffer is empty, we're done here. */
	120	if (ret == 0 \|\| ec_buffer[0] == '\0')
	121	break;
	122
	123	idx = 0;
124	while (idx < ret && ec_buffer[idx] != '\0' && buf_space > 0) {
125	cb->buf[cb->head] = ec_buffer[idx];
126	cb->head = CIRC_ADD(cb->head, LOG_SIZE, 1);
127	idx++;
128	buf_space--;
129	}
130
131	wake_up(&debug_info->log_wq);
132	}
133
134	mutex_unlock(&debug_info->log_mutex);
135
136	resched:
137	schedule_delayed_work(&debug_info->log_poll_work,
138	msecs_to_jiffies(LOG_POLL_SEC * 1000));
139	}
140
141	static int cros_ec_console_log_open(struct inode inode, struct file file)
142	{
143	file->private_data = inode->i_private;
144
145	return nonseekable_open(inode, file);
146	}
147
148	static ssize_t cros_ec_console_log_read(struct file file, char __user buf,
149	size_t count, loff_t *ppos)
150	{
151	struct cros_ec_debugfs *debug_info = file->private_data;
152	struct circ_buf *cb = &debug_info->log_buffer;
153	ssize_t ret;
154
155	mutex_lock(&debug_info->log_mutex);
156
157	while (!CIRC_CNT(cb->head, cb->tail, LOG_SIZE)) {
158	if (file->f_flags & O_NONBLOCK) {
159	ret = -EAGAIN;
160	goto error;
161	}
162
163	mutex_unlock(&debug_info->log_mutex);
164
165	ret = wait_event_interruptible(debug_info->log_wq,
166	CIRC_CNT(cb->head, cb->tail, LOG_SIZE));
167	if (ret < 0)
168	return ret;
169
170	mutex_lock(&debug_info->log_mutex);
171	}
172
173	/* Only copy until the end of the circular buffer, and let userspace
174	* retry to get the rest of the data.
175	*/
176	ret = min_t(size_t, CIRC_CNT_TO_END(cb->head, cb->tail, LOG_SIZE),
177	count);
178
179	if (copy_to_user(buf, cb->buf + cb->tail, ret)) {
180	ret = -EFAULT;
181	goto error;
182	}
183
184	cb->tail = CIRC_ADD(cb->tail, LOG_SIZE, ret);
185
186	error:
187	mutex_unlock(&debug_info->log_mutex);
188	return ret;
189	}
190
afc9a42b	191	static __poll_t cros_ec_console_log_poll(struct file *file,
e8626459 EC	192	poll_table *wait)
	193	{
	194	struct cros_ec_debugfs *debug_info = file->private_data;
afc9a42b	195	__poll_t mask = 0;
e8626459 EC	196
	197	poll_wait(file, &debug_info->log_wq, wait);
	198
	199	mutex_lock(&debug_info->log_mutex);
	200	if (CIRC_CNT(debug_info->log_buffer.head,
	201	debug_info->log_buffer.tail,
	202	LOG_SIZE))
a9a08845	203	mask \|= EPOLLIN \| EPOLLRDNORM;
e8626459 EC	204	mutex_unlock(&debug_info->log_mutex);
	205
	206	return mask;
	207	}
	208
	209	static int cros_ec_console_log_release(struct inode inode, struct file file)
	210	{
	211	return 0;
	212	}
	213
	214	const struct file_operations cros_ec_console_log_fops = {
	215	.owner = THIS_MODULE,
	216	.open = cros_ec_console_log_open,
	217	.read = cros_ec_console_log_read,
	218	.llseek = no_llseek,
	219	.poll = cros_ec_console_log_poll,
	220	.release = cros_ec_console_log_release,
	221	};
	222
	223	static int ec_read_version_supported(struct cros_ec_dev *ec)
	224	{
	225	struct ec_params_get_cmd_versions_v1 *params;
	226	struct ec_response_get_cmd_versions *response;
	227	int ret;
	228
	229	struct cros_ec_command *msg;
	230
73b44f40	231	msg = kzalloc(sizeof(msg) + max(sizeof(params), sizeof(*response)),
e8626459 EC	232	GFP_KERNEL);
	233	if (!msg)
	234	return 0;
	235
	236	msg->command = EC_CMD_GET_CMD_VERSIONS + ec->cmd_offset;
73b44f40 SN	237	msg->outsize = sizeof(*params);
73b44f40 SN	238	msg->insize = sizeof(*response);
e8626459 EC	239
	240	params = (struct ec_params_get_cmd_versions_v1 *)msg->data;
	241	params->cmd = EC_CMD_CONSOLE_READ;
	242	response = (struct ec_response_get_cmd_versions *)msg->data;
	243
	244	ret = cros_ec_cmd_xfer(ec->ec_dev, msg) >= 0 &&
	245	msg->result == EC_RES_SUCCESS &&
	246	(response->version_mask & EC_VER_MASK(1));
	247
	248	kfree(msg);
	249
	250	return ret;
	251	}
	252
	253	static int cros_ec_create_console_log(struct cros_ec_debugfs *debug_info)
	254	{
	255	struct cros_ec_dev *ec = debug_info->ec;
	256	char *buf;
	257	int read_params_size;
	258	int read_response_size;
	259
	260	if (!ec_read_version_supported(ec)) {
	261	dev_warn(ec->dev,
	262	"device does not support reading the console log\n");
	263	return 0;
	264	}
	265
	266	buf = devm_kzalloc(ec->dev, LOG_SIZE, GFP_KERNEL);
	267	if (!buf)
	268	return -ENOMEM;
	269
	270	read_params_size = sizeof(struct ec_params_console_read_v1);
	271	read_response_size = ec->ec_dev->max_response;
	272	debug_info->read_msg = devm_kzalloc(ec->dev,
	273	sizeof(*debug_info->read_msg) +
	274	max(read_params_size, read_response_size), GFP_KERNEL);
	275	if (!debug_info->read_msg)
	276	return -ENOMEM;
	277
	278	debug_info->read_msg->version = 1;
	279	debug_info->read_msg->command = EC_CMD_CONSOLE_READ + ec->cmd_offset;
	280	debug_info->read_msg->outsize = read_params_size;
	281	debug_info->read_msg->insize = read_response_size;
	282
	283	debug_info->log_buffer.buf = buf;
	284	debug_info->log_buffer.head = 0;
	285	debug_info->log_buffer.tail = 0;
	286
	287	mutex_init(&debug_info->log_mutex);
	288	init_waitqueue_head(&debug_info->log_wq);
	289
	290	if (!debugfs_create_file("console_log",
	291	S_IFREG \| S_IRUGO,
	292	debug_info->dir,
	293	debug_info,
	294	&cros_ec_console_log_fops))
	295	return -ENOMEM;
	296
	297	INIT_DELAYED_WORK(&debug_info->log_poll_work,
	298	cros_ec_console_log_work);
	299	schedule_delayed_work(&debug_info->log_poll_work, 0);
	300
	301	return 0;
	302	}
303
304	static void cros_ec_cleanup_console_log(struct cros_ec_debugfs *debug_info)
305	{
306	if (debug_info->log_buffer.buf) {
307	cancel_delayed_work_sync(&debug_info->log_poll_work);
308	mutex_destroy(&debug_info->log_mutex);
309	}
310	}
311
6e494106 NB	312	static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info)
	313	{
	314	struct cros_ec_device *ec_dev = debug_info->ec->ec_dev;
	315	int ret;
	316	struct cros_ec_command *msg;
	317	int insize;
	318
	319	insize = ec_dev->max_response;
	320
	321	msg = devm_kzalloc(debug_info->ec->dev,
	322	sizeof(*msg) + insize, GFP_KERNEL);
	323	if (!msg)
	324	return -ENOMEM;
	325
	326	msg->command = EC_CMD_GET_PANIC_INFO;
	327	msg->insize = insize;
	328
	329	ret = cros_ec_cmd_xfer(ec_dev, msg);
	330	if (ret < 0) {
	331	dev_warn(debug_info->ec->dev, "Cannot read panicinfo.\n");
	332	ret = 0;
	333	goto free;
	334	}
	335
	336	/* No panic data */
	337	if (ret == 0)
	338	goto free;
	339
	340	debug_info->panicinfo_blob.data = msg->data;
	341	debug_info->panicinfo_blob.size = ret;
	342
	343	if (!debugfs_create_blob("panicinfo",
	344	S_IFREG \| S_IRUGO,
	345	debug_info->dir,
	346	&debug_info->panicinfo_blob)) {
	347	ret = -ENOMEM;
	348	goto free;
	349	}
	350
	351	return 0;
	352
	353	free:
	354	devm_kfree(debug_info->ec->dev, msg);
	355	return ret;
	356	}
	357
e8626459 EC	358	int cros_ec_debugfs_init(struct cros_ec_dev *ec)
	359	{
	360	struct cros_ec_platform *ec_platform = dev_get_platdata(ec->dev);
	361	const char *name = ec_platform->ec_name;
	362	struct cros_ec_debugfs *debug_info;
	363	int ret;
	364
	365	debug_info = devm_kzalloc(ec->dev, sizeof(*debug_info), GFP_KERNEL);
	366	if (!debug_info)
	367	return -ENOMEM;
	368
	369	debug_info->ec = ec;
	370	debug_info->dir = debugfs_create_dir(name, NULL);
	371	if (!debug_info->dir)
	372	return -ENOMEM;
	373
6e494106 NB	374	ret = cros_ec_create_panicinfo(debug_info);
	375	if (ret)
	376	goto remove_debugfs;
	377
e8626459 EC	378	ret = cros_ec_create_console_log(debug_info);
	379	if (ret)
	380	goto remove_debugfs;
	381
	382	ec->debug_info = debug_info;
	383
	384	return 0;
	385
	386	remove_debugfs:
	387	debugfs_remove_recursive(debug_info->dir);
	388	return ret;
	389	}
ea01a31b	390	EXPORT_SYMBOL(cros_ec_debugfs_init);
e8626459 EC	391
	392	void cros_ec_debugfs_remove(struct cros_ec_dev *ec)
	393	{
	394	if (!ec->debug_info)
	395	return;
	396
	397	debugfs_remove_recursive(ec->debug_info->dir);
	398	cros_ec_cleanup_console_log(ec->debug_info);
	399	}
ea01a31b	400	EXPORT_SYMBOL(cros_ec_debugfs_remove);