linux-kernel - Re: [Linaro-mm-sig] [PATCH 00/11] drm/msm: drm scheduler conversion and cleanups

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Date:   Tue, 20 Jul 2021 16:24:04 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Christian König 
        <ckoenig.leichtzumerken@...il.com>
Cc:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        freedreno@...ts.freedesktop.org,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Emma Anholt <emma@...olt.net>, Bernard Zhao <bernard@...o.com>,
        Sharat Masetty <smasetty@...eaurora.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        Zhenzhong Duan <zhenzhong.duan@...il.com>,
        "Kristian H. Kristensen" <hoegsberg@...gle.com>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Lee Jones <lee.jones@...aro.org>,
        Dave Airlie <airlied@...hat.com>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>
Subject: Re: [Linaro-mm-sig] [PATCH 00/11] drm/msm: drm scheduler conversion
 and cleanups

On Tue, Jul 20, 2021 at 04:16:56PM +0200, Christian König wrote:
> Am 20.07.21 um 16:07 schrieb Daniel Vetter:
> > On Mon, Jul 19, 2021 at 10:40:57AM +0200, Christian König wrote:
> > > Am 17.07.21 um 22:29 schrieb Rob Clark:
> > > > From: Rob Clark <robdclark@...omium.org>
> > > > 
> > > > Conversion to gpu_scheduler, and bonus removal of
> > > > drm_gem_object_put_locked()
> > > Oh yes please!
> > > 
> > > If I'm not completely mistaken that was the last puzzle piece missing to
> > > unify TTMs and GEMs refcount of objects.
> > Why does drm/msm, a driver not using ttm at all, block ttm refactorings?
> > We can just check whether the TTM using driver is potentially using locked
> > final unref and have a special version of
> > drm_gem_object_put_guaranteed_unlocked or whatever the bikeshed will look
> > like, which doesn't have the migth_lock.
> 
> Because we now don't have any unrealistic lock inversion between
> dev->struct_mutex and obj->resv lockdep can complain any more.

Yeah I know, but we didn't have that since a while ago if you're limiting
the audit to ttm using drivers. Which are the only ones that matter for
this, the only thing that caused issues was object_put still being
dev->struct_mutex infested for backwards compat. But even that changed a
while ago I think.
-Daniel

> 
> Cheers,
> Christian.
> 
> > 
> > Anyway, deed is done now :-)
> > -Daniel
> > 
> > > Only problem is that I only see patch 7 and 9 in my inbox. Where is the
> > > rest?
> > > 
> > > Thanks,
> > > Christian.
> > > 
> > > > Rob Clark (11):
> > > >     drm/msm: Docs and misc cleanup
> > > >     drm/msm: Small submitqueue creation cleanup
> > > >     drm/msm: drop drm_gem_object_put_locked()
> > > >     drm: Drop drm_gem_object_put_locked()
> > > >     drm/msm/submit: Simplify out-fence-fd handling
> > > >     drm/msm: Consolidate submit bo state
> > > >     drm/msm: Track "seqno" fences by idr
> > > >     drm/msm: Return ERR_PTR() from submit_create()
> > > >     drm/msm: Conversion to drm scheduler
> > > >     drm/msm: Drop struct_mutex in submit path
> > > >     drm/msm: Utilize gpu scheduler priorities
> > > > 
> > > >    drivers/gpu/drm/drm_gem.c                   |  22 --
> > > >    drivers/gpu/drm/msm/Kconfig                 |   1 +
> > > >    drivers/gpu/drm/msm/adreno/a5xx_debugfs.c   |   4 +-
> > > >    drivers/gpu/drm/msm/adreno/a5xx_gpu.c       |   6 +-
> > > >    drivers/gpu/drm/msm/adreno/a5xx_power.c     |   2 +-
> > > >    drivers/gpu/drm/msm/adreno/a5xx_preempt.c   |   7 +-
> > > >    drivers/gpu/drm/msm/adreno/a6xx_gmu.c       |  12 +-
> > > >    drivers/gpu/drm/msm/adreno/a6xx_gpu.c       |   2 +-
> > > >    drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c |   4 +-
> > > >    drivers/gpu/drm/msm/adreno/adreno_gpu.c     |   6 +-
> > > >    drivers/gpu/drm/msm/msm_drv.c               |  30 +-
> > > >    drivers/gpu/drm/msm/msm_fence.c             |  39 ---
> > > >    drivers/gpu/drm/msm/msm_fence.h             |   2 -
> > > >    drivers/gpu/drm/msm/msm_gem.c               |  91 +-----
> > > >    drivers/gpu/drm/msm/msm_gem.h               |  37 ++-
> > > >    drivers/gpu/drm/msm/msm_gem_submit.c        | 300 ++++++++++++--------
> > > >    drivers/gpu/drm/msm/msm_gpu.c               |  50 +---
> > > >    drivers/gpu/drm/msm/msm_gpu.h               |  41 ++-
> > > >    drivers/gpu/drm/msm/msm_ringbuffer.c        |  70 ++++-
> > > >    drivers/gpu/drm/msm/msm_ringbuffer.h        |  12 +
> > > >    drivers/gpu/drm/msm/msm_submitqueue.c       |  49 +++-
> > > >    include/drm/drm_gem.h                       |   2 -
> > > >    include/uapi/drm/msm_drm.h                  |  10 +-
> > > >    23 files changed, 440 insertions(+), 359 deletions(-)
> > > > 
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch