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

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Date: Wed, 7 Feb 2024 14:27:16 +0530
From: Ekansh Gupta <quic_ekangupt@...cinc.com>
To: Greg KH <gregkh@...uxfoundation.org>
CC: <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 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.

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.

Please let me know if you have any other queries.

Thanks
--ekansh