linux-kernel - Re: [PATCH v1 00/16] Add missing features to FastRPC driver

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Message-ID: <CAA8EJpqB4OG1n9maGuwo4BLRPctD6-nHJBvzauxoodS_Xji86g@mail.gmail.com>
Date: Wed, 7 Feb 2024 11:51:41 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>
Cc: neil.armstrong@...aro.org, srinivas.kandagatla@...aro.org, 
	linux-arm-msm@...r.kernel.org, gregkh@...uxfoundation.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 00/16] Add missing features to FastRPC driver

On Wed, 7 Feb 2024 at 10:30, Ekansh Gupta <quic_ekangupt@...cinc.com> wrote:
>
>
> On 2/2/2024 1:41 PM, neil.armstrong@...aro.org wrote:
> > Hi,
> >
> > On 02/02/2024 07:40, Ekansh Gupta wrote:
> >> This patch series adds the listed features that have been missing
> >> in upstream fastRPC driver.
> >>
> >> - Redesign and improve remote heap management.
> >> - Add static PD restart support for audio and sensors PD using
> >>    PDR framework.
> >> - Add changes to support multimode invocation ioctl request. This
> >>    ioctl call facilitates multiple types of requests from user including
> >>    CRC check, performance counters, shared context bank usage, etc.
> >>    This series also carries patch to save and restore interrupted
> >>    context.
> >> - Add early wakeup support to allow DSP user to send early response
> >>    to CPU and improve fastrpc performance.
> >> - Add polling mode support with which driver polls on memory to avoid
> >>    CPU from going to low power modes.
> >> - Add notifications frameworks to provide users with the DSP PD status
> >>    notifications.
> >> - Add a control mechanism to allow users to clean up DSP user PD
> >> - Add wakelock management support
> >> - Add DSP signalling support
> >> - Add check for untrusted applications and allow trusted processed to
> >>    offload to system unsigned PD.
> >
> > Could you precise:
> > - Which workload are you fixing
> > - Which platforms are concerned
> > - Which platforms were tested
> >
> 1. This patch mostly consists of missing features from fastrpc driver and it doesn't
> carry any bug fixes.
> 2. We are not targeting these changes for any specific platform. These features are
> applicable for most of the recent platforms .

Please define 'recent'. The upstream kernel supports a wide set of
platforms. We have fastrpc supported since msm8916. Please make sure
that your patches will not break on such platforms.

> 3. These changes were tested on SM8650 and QCM6490 platforms.
>
> > So far I've been trying to run the "getserial" on SM8550-QRD and
> > SM8650-QRD without
> > success, would those changes fix this ?
>
> Can you please help me with the "getserial" failure details? Or the steps that you are
> running to get to the failure? I can have a look at that to understand the reason for
> failure.
>
> > Is there any chance we could get an open-source minimal implementation
> > of a fastRPC SDK using
> > the open-source Hexagon LLVM like we have for the AIC100 ?
> > It would definitely help validating the upstream fastRPC implementation.
>
> Generally Hexagon SDK is used to write and test fastRPC use-cases which is well documented.
> Is there anything else that you can suggest would help here?

Hexagon SDK is a closed source toolkit. Both in terms of toolchain,
library code and generated code.
The fastrpc_shell_N, which is used to handle loaded code, is also
closed source. As such, it is nearly impossible to verify the code.
Please consider the requirements for the drivers/accel/ subsystem: to
have complete open source userspace. Qualcomm AIC100, for example,
fulfills those requirements.

>
> >
> > Thanks,
> > Neil
> >
> Hi Neil, added my comments.
>
> --ekansh
>
> >>
> >> Ekansh Gupta (16):
> >>    misc: fastrpc: Redesign remote heap management
> >>    misc: fastrpc: Add support for unsigned PD
> >>    misc: fastrpc: Add static PD restart support
> >>    misc: fastrpc: Add fastrpc multimode invoke request support
> >>    misc: fastrpc: Add CRC support for remote buffers
> >>    misc: fastrpc: Capture kernel and DSP performance counters
> >>    misc: fastrpc: Add support to save and restore interrupted
> >>    misc: fastrpc: Add support to allocate shared context bank
> >>    misc: fastrpc: Add early wakeup support for fastRPC driver
> >>    misc: fastrpc: Add polling mode support for fastRPC driver
> >>    misc: fastrpc: Add DSP PD notification support
> >>    misc: fastrpc: Add support for users to clean up DSP user PD
> >>    misc: fastrpc: Add wakelock management support
> >>    misc: fastrpc: Add DSP signal support
> >>    misc: fastrpc: Restrict untrusted apk to spawn privileged PD
> >>    misc: fastrpc: Add system unsigned PD support
> >>
> >>   drivers/misc/fastrpc.c      | 1949 +++++++++++++++++++++++++++++++----
> >>   include/uapi/misc/fastrpc.h |  112 ++
> >>   2 files changed, 1844 insertions(+), 217 deletions(-)
> >>
> >
>


-- 
With best wishes
Dmitry