From 6e4941067cef482c9ed254cf06cab70c32db05b2 Mon Sep 17 00:00:00 2001 From: Nicolas Boichat Date: Tue, 16 May 2017 17:46:48 +0200 Subject: mfd: cros_ec: Add support for dumping panic information 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 Reviewed-by: Guenter Roeck Tested-by: Enric Balletbo i Serra Signed-off-by: Benson Leung --- drivers/platform/chrome/cros_ec_debugfs.c | 54 +++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) (limited to 'drivers/platform/chrome/cros_ec_debugfs.c') diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c index c4150871b8ed..4cc66f405760 100644 --- a/drivers/platform/chrome/cros_ec_debugfs.c +++ b/drivers/platform/chrome/cros_ec_debugfs.c @@ -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; -- cgit v1.2.3-59-g8ed1b