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

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On Tue, Nov 24, 2015 at 5:14 AM, Lee Jones <lee.jones@linaro.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@st.com>
> Signed-off-by: Lee Jones <lee.jones@linaro.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@sonymobile.com>

Regards,
Bjorn
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[RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics platforms Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 5/6] ARM: STiH407: Add nodes for RemoteProc Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 6/6] ARM: STiH407: Move over to using the 'reserved-memory' API for obtaining DMA memory Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 4/6] MAINTAINERS: Add ST's Remote Processor Driver to ARM/STI ARCHITECTURE Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 1/6] remoteproc: dt: Provide bindings for ST's Remote Processor Controller driver Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
    Re: [RESEND v4 1/6] remoteproc: dt: Provide bindings for ST's Remote  Processor Controller driver Rob Herring <robh@kernel.org> - 2015-11-25 01:10 +0100
  [RESEND v4 3/6] remoteproc: Supply controller driver for ST's Remote Processors Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
  [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs Lee Jones <lee.jones@linaro.org> - 2015-11-24 14:20 +0100
    Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote  processor using debugfs Bjorn Andersson <bjorn@kryo.se> - 2015-11-27 18:10 +0100
  Re: [RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics platforms Ohad Ben-Cohen <ohad@wizery.com> - 2015-11-26 09:50 +0100
    Re: [RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics  platforms Lee Jones <lee.jones@linaro.org> - 2015-11-26 10:20 +0100
      Re: [RESEND v4 0/6] remoteproc: Add driver for STMicroelectronics platforms Ohad Ben-Cohen <ohad@wizery.com> - 2015-11-26 10:40 +0100

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