linux-kernel - Re: [PATCH v1 02/16] misc: fastrpc: Add support for unsigned PD

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Message-ID: <CAA8EJppuaPLuH2Xb1Cu6P1HiD3PSjTy4L-Q6C3S82m5RAxfApg@mail.gmail.com>
Date: Wed, 7 Feb 2024 11:52:59 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>
Cc: Greg KH <gregkh@...uxfoundation.org>, srinivas.kandagatla@...aro.org, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 02/16] misc: fastrpc: Add support for unsigned PD

On Wed, 7 Feb 2024 at 10:57, Ekansh Gupta <quic_ekangupt@...cinc.com> wrote:
>
>
> On 2/2/2024 8:13 PM, Greg KH wrote:
> > On Fri, Feb 02, 2024 at 12:10:25PM +0530, Ekansh Gupta wrote:
> >> Unsigned PD requires more initial memory to spawn.
> > What exactly is "Unsigned PD"?
> >
> > And where are all of the userspace changes for this series so we can
> > verify they work properly?
> >
> > thanks,
> >
> > greg k-h
>
> Hi Greg,
> Unsigned PDs are sandboxed DSP processes used to offload computation
> workloads to the DSP. Unsigned PD have less privileges in terms of
> DSP resource access as compared to Signed PD.

All such details must be described in commit messages for the patches.

>
> Unsigned PD can be enabled using userspace API:
> https://git.codelinaro.org/linaro/qcomlt/fastrpc/-/blob/master/src/fastrpc_apps_user.c?ref_type=heads#L1173
>
> For multimode invoke request(other feature) also I've shared the
> userspace changes with Srini which he will be pulling to userspace
> project.

And this should be a part of the cover letter.

>
> Please let me know if you have any other queries.
>
> Thanks
> --ekansh
>
>


-- 
With best wishes
Dmitry