linux-kernel - Re: [PATCH] drm/msm: fix race in Adreno header generation

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Message-ID: <7w522k6vkngqw2tfbmrhuvxxcdlby3wwzueaqw75pxud2y7puw@2rjhjl5ikn6c>
Date: Mon, 25 Aug 2025 22:59:43 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <rob.clark@....qualcomm.com>
Cc: Akhil P Oommen <akhilpo@....qualcomm.com>,
        Alex Robinson <alex@...nrobin.net>, lumag@...nel.org,
        abhinav.kumar@...ux.dev, jessica.zhang@....qualcomm.com,
        sean@...rly.run, marijn.suijten@...ainline.org, airlied@...il.com,
        simona@...ll.ch, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm: fix race in Adreno header generation

On Mon, Aug 25, 2025 at 10:48:06AM -0700, Rob Clark wrote:
> On Mon, Aug 25, 2025 at 9:23 AM Akhil P Oommen <akhilpo@....qualcomm.com> wrote:
> >
> > On 8/23/2025 7:46 PM, Rob Clark wrote:
> > > On Sat, Aug 23, 2025 at 6:49 AM Dmitry Baryshkov
> > > <dmitry.baryshkov@....qualcomm.com> wrote:
> > >>
> > >> On Sat, Aug 23, 2025 at 02:09:39AM +0000, Alex Robinson wrote:
> > >>> Builds can compile msm-y objects (e.g. msm_gpu_devfreq.o)
> > >>> before adreno_common.xml.h is generated in trees that generate Adreno
> > >>> headers at build time. Make msm-y depend on the generated headers,
> > >>> removing the race.
> > >>>
> > >>> Signed-off-by: Alex Robinson <alex@...nrobin.net>
> > >>> ---
> > >>>  drivers/gpu/drm/msm/Makefile | 1 +
> > >>>  1 file changed, 1 insertion(+)
> > >>>
> > >>> diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
> > >>> index 0c0dfb25f01b..1a918d44ac48 100644
> > >>> --- a/drivers/gpu/drm/msm/Makefile
> > >>> +++ b/drivers/gpu/drm/msm/Makefile
> > >>> @@ -221,6 +221,7 @@ DISPLAY_HEADERS = \
> > >>>       generated/sfpb.xml.h
> > >>>
> > >>>  $(addprefix $(obj)/,$(adreno-y)): $(addprefix $(obj)/,$(ADRENO_HEADERS))
> > >>> +$(addprefix $(obj)/,$(msm-y)): $(addprefix $(obj)/,$(ADRENO_HEADERS))
> > >>
> > >> I'd say, no. The idea was that msm-y should not depend on
> > >> ADRENO_HEADERS. If there is any dependency, please move it to adreno-y.
> > >
> > > probably we should s/adreno/gpu/ and move all the msm_gpu*.* there..
> > >
> > > In the mean time, I think we were going to drop this patch from the IFPC series
> >
> > Yeah. I will drop that patch.
> >
> > Btw, was my usage of adreno_gpu symbol in msm_gpu* files incorrect?
> 
> I suppose _technically_ it is, but the split btwn msm_gpu and adreno
> really only made sense for a2xx, and only if we tried to upstream the
> old 2d core, which never happened

Granted that there seem to be nobody interested in OpenVG anymore, I
suggest we forget that Z180 existed. I think it would be wise to
simplify things for the GPU cores (merging more of the msm_gpu_* into
adreno/).

-- 
With best wishes
Dmitry