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mfd: cros_ec: Add support for dumping panic information

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This dumps the EC panic information from the previous reboot.

Similar to the information presented by ectool panicinfo, except
that we do not bother doing any parsing (we should write a small
offline tool for that).

Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
This commit is contained in:
Nicolas Boichat 2017-05-16 17:46:48 +02:00 committed by Benson Leung
parent 73b44f40c6
commit 6e4941067c
1 changed files with 54 additions and 0 deletions
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54
drivers/platform/chrome/cros_ec_debugfs.c
View File

@ -47,15 +47,19 @@
* @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;
};
/*
@ -308,6 +312,52 @@ static void cros_ec_cleanup_console_log(struct cros_ec_debugfs *debug_info)
}
}
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);
@ -324,6 +374,10 @@ int cros_ec_debugfs_init(struct cros_ec_dev *ec)
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;