Re: [PATCH] remoteproc: debug: add crash debugfs node

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Wed 07 Nov 07:26 PST 2018, Xiang Xiao wrote:

> so we can trigger the crash manully which could:
> 1.test the crash handling code path more easily
> 2.update the firmware without reboot kernel

It's probably better to stop then start the remoteproc to update the
firmware, but I like the patch - applied for v4.21.

Regards,
Bjorn

> 
> Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
> ---
>  drivers/remoteproc/remoteproc_debugfs.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
> index 0808466..fca4b2b 100644
> --- a/drivers/remoteproc/remoteproc_debugfs.c
> +++ b/drivers/remoteproc/remoteproc_debugfs.c
> @@ -154,6 +154,30 @@ static const struct file_operations rproc_recovery_ops = {
>  	.llseek = generic_file_llseek,
>  };
>  
> +/* expose the crash trigger via debugfs */
> +static ssize_t
> +rproc_crash_write(struct file *filp, const char __user *user_buf,
> +		  size_t count, loff_t *ppos)
> +{
> +	struct rproc *rproc = filp->private_data;
> +	unsigned int type;
> +	int ret;
> +
> +	ret = kstrtouint_from_user(user_buf, count, 0, &type);
> +	if (ret < 0)
> +		return ret;
> +
> +	rproc_report_crash(rproc, type);
> +
> +	return count;
> +}
> +
> +static const struct file_operations rproc_crash_ops = {
> +	.write = rproc_crash_write,
> +	.open = simple_open,
> +	.llseek = generic_file_llseek,
> +};
> +
>  /* Expose resource table content via debugfs */
>  static int rproc_rsc_table_show(struct seq_file *seq, void *p)
>  {
> @@ -324,6 +348,8 @@ void rproc_create_debug_dir(struct rproc *rproc)
>  			    rproc, &rproc_name_ops);
>  	debugfs_create_file("recovery", 0400, rproc->dbg_dir,
>  			    rproc, &rproc_recovery_ops);
> +	debugfs_create_file("crash", 0200, rproc->dbg_dir,
> +			    rproc, &rproc_crash_ops);
>  	debugfs_create_file("resource_table", 0400, rproc->dbg_dir,
>  			    rproc, &rproc_rsc_table_ops);
>  	debugfs_create_file("carveout_memories", 0400, rproc->dbg_dir,
> -- 
> 2.7.4
>