linux-kernel - Re: [PATCH RESEND 04/13] mfd: cros_ec: Add support for dumping panic information

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Message-ID: <20170622233828.GA125744@decatoncale.mtv.corp.google.com>
Date:   Thu, 22 Jun 2017 16:38:28 -0700
From:   Benson Leung <bleung@...gle.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     olof@...om.net, bleung@...omium.org, linux-kernel@...r.kernel.org,
        lee.jones@...aro.org, Nicolas Boichat <drinkcat@...omium.org>,
        bleung@...gle.com
Subject: Re: [PATCH RESEND 04/13] mfd: cros_ec: Add support for dumping panic
 information

Hi Enric,

On Tue, May 16, 2017 at 06:13:10PM +0200, Enric Balletbo i Serra wrote:
> From: Nicolas Boichat <drinkcat@...omium.org>
> 
> 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@...omium.org>
> Reviewed-by: Guenter Roeck <groeck@...omium.org>
> Tested-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

Signed-off-by: Benson Leung <bleung@...omium.org>
Applied. Thanks.

> ---
>  drivers/platform/chrome/cros_ec_debugfs.c | 54 +++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
> index f8195bb..8133c33 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;
> -- 
> 2.9.3
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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