linux-kernel - Re: [PATCH 0/7] DRM kmap() fixes and kmap_local

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Date:   Wed, 19 Jan 2022 15:55:42 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     David Airlie <airlied@...ux.ie>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org,
        Christian K�nig <christian.koenig@....com>
Subject: Re: [PATCH 0/7] DRM kmap() fixes and kmap_local_page() conversions

On Wed, Jan 19, 2022 at 06:24:22PM +0100, Daniel Vetter wrote:
> On Wed, Jan 19, 2022 at 08:53:56AM -0800, Ira Weiny wrote:
> > On Fri, Dec 10, 2021 at 03:23:57PM -0800, 'Ira Weiny' wrote:
> > > From: Ira Weiny <ira.weiny@...el.com>
> > > 
> > > This series starts by converting the last easy kmap() uses to
> > > kmap_local_page().
> > > 
> > > There is one more call to kmap() wrapped in ttm_bo_kmap_ttm().  Unfortunately,
> > > ttm_bo_kmap_ttm() is called in a number of different ways including some which
> > > are not thread local.  I have a patch to convert that call.  However, it is not
> > > straight forward so it is not included in this series.
> > > 
> > > The final 2 patches fix bugs found while working on the ttm_bo_kmap_ttm()
> > > conversion.
> > 
> > Gentile ping on this series?  Will it make this merge window?
> 
> I think this fell through the cracks and so no. Note that generally we
> feature-freeze drm tree around -rc6 anyway for the upcoming merge window,
> so you were cutting this all a bit close anyway.

Ok, No problem.  I just had not heard if this was picked up or not.

> Also looks like the ttm
> kmap caching question didn't get resolved?

I'm sorry I thought it was resolve for this series.  Christian said the patches
in this series were "a good bug fix" even if not strictly necessary.[1]  Beyond
this series I was discussing where to go from here, and is it possible to go
further with more changes.[2]  At the moment I don't think I will.

Christian did I misunderstand?  I can drop patch 6 and 7 if they are not proper
bug fixes or at least clarifications to the code.

Ira

[1] https://lore.kernel.org/lkml/c3b173ea-6509-ebbe-b5f9-eeb29f1ce57e@amd.com/
[2] https://lore.kernel.org/lkml/20211215210949.GW3538886@iweiny-DESK2.sc.intel.com/

> 
> Anyway if patches are stuck resend with RESEND and if people still don't
> pick them up poke me and I'll apply as fallback.
> 
> Cheers, Daniel
> 
> > 
> > Thanks,
> > Ira
> > 
> > > 
> > > 
> > > Ira Weiny (7):
> > > drm/i915: Replace kmap() with kmap_local_page()
> > > drm/amd: Replace kmap() with kmap_local_page()
> > > drm/gma: Remove calls to kmap()
> > > drm/radeon: Replace kmap() with kmap_local_page()
> > > drm/msm: Alter comment to use kmap_local_page()
> > > drm/amdgpu: Ensure kunmap is called on error
> > > drm/radeon: Ensure kunmap is called on error
> > > 
> > > drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 8 ++++----
> > > drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c | 1 +
> > > drivers/gpu/drm/gma500/gma_display.c | 6 ++----
> > > drivers/gpu/drm/gma500/mmu.c | 8 ++++----
> > > drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 4 ++--
> > > drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c | 8 ++++----
> > > drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c | 4 ++--
> > > drivers/gpu/drm/i915/gt/shmem_utils.c | 4 ++--
> > > drivers/gpu/drm/i915/i915_gem.c | 8 ++++----
> > > drivers/gpu/drm/i915/i915_gpu_error.c | 4 ++--
> > > drivers/gpu/drm/msm/msm_gem_submit.c | 4 ++--
> > > drivers/gpu/drm/radeon/radeon_ttm.c | 4 ++--
> > > drivers/gpu/drm/radeon/radeon_uvd.c | 1 +
> > > 13 files changed, 32 insertions(+), 32 deletions(-)
> > > 
> > > --
> > > 2.31.1
> > > 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch