linux-kernel - Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs

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Date:	Fri, 27 Nov 2015 09:00:46 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kernel@...inux.com, Maxime Coquelin <maxime.coquelin@...com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Nathan_Lynch@...tor.com, Florian Fainelli <f.fainelli@...il.com>,
	ludovic.barre@...com, Suman Anna <s-anna@...com>
Subject: Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote
 processor using debugfs

On Tue, Nov 24, 2015 at 5:14 AM, Lee Jones <lee.jones@...aro.org> wrote:
> This functionality is especially useful during the testing phase.  When
> used in conjunction with Mailbox's Test Framework we can trivially conduct
> end-to-end testing i.e. boot co-processor, send and receive messages to
> the co-processor, then shut it down again (repeat as required).
>

I want this too!

> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/remoteproc/remoteproc_debugfs.c | 34 +++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>
> diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
> index 9d30809..8113c18 100644
> --- a/drivers/remoteproc/remoteproc_debugfs.c
> +++ b/drivers/remoteproc/remoteproc_debugfs.c
> @@ -88,8 +88,42 @@ static ssize_t rproc_state_read(struct file *filp, char __user *userbuf,
>         return simple_read_from_buffer(userbuf, count, ppos, buf, i);
>  }
>
> +static ssize_t rproc_state_write(struct file *filp, const char __user *userbuf,
> +                                size_t count, loff_t *ppos)
> +{
> +       struct rproc *rproc = filp->private_data;
> +       char buf[10];
> +       int ret;
> +
> +       if (count > sizeof(buf))
> +               return count;
> +
> +       ret = copy_from_user(buf, userbuf, count);
> +       if (ret)
> +               return -EFAULT;
> +
> +       if (buf[count - 1] == '\n')
> +               buf[count - 1] = '\0';

I believe you can get here with count = 0.

> +
> +       if (!strncmp(buf, "start", count)) {
> +               ret = rproc_boot(rproc);
> +               if (ret) {
> +                       dev_err(&rproc->dev, "Boot failed: %d\n", ret);
> +                       return ret;
> +               }
> +       } else if (!strncmp(buf, "stop", count)) {
> +               rproc_shutdown(rproc);
> +       } else {
> +               dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);

Unrecognized

> +               return -EINVAL;
> +       }
> +
> +       return count;
> +}
> +
>  static const struct file_operations rproc_state_ops = {
>         .read = rproc_state_read,
> +       .write = rproc_state_write,
>         .open = simple_open,
>         .llseek = generic_file_llseek,
>  };

Part of these nits

Acked-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>

Regards,
Bjorn
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