linux-kernel - Re: [PATCH V2 0/7] DRM kmap() fixes and kmap_local

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Message-ID: <a56344b6-b1bd-6749-5ed2-5f38bf79dcee@gmail.com>
Date:   Mon, 24 Jan 2022 13:08:26 +0100
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     ira.weiny@...el.com, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>
Cc:     linux-arm-msm@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org
Subject: Re: [PATCH V2 0/7] DRM kmap() fixes and kmap_local_page() conversions

Am 24.01.22 um 02:54 schrieb ira.weiny@...el.com:
> From: Ira Weiny <ira.weiny@...el.com>
>
> Changes from V1:
> 	Use memcpy_to_page() where appropriate
> 	Rebased to latest
>
> The kmap() call may cause issues with work being done with persistent memory.
> For this and other reasons it is being deprecated.

I'm really wondering how we should be able to implement the kernel 
mapping without kmap in TTM.

> This series starts by converting the last easy kmap() uses in the drm tree to
> kmap_local_page().
>
> The final 2 patches fix bugs found while working on the ttm_bo_kmap_ttm()
> conversion.  They are valid fixes but were found via code inspection not
> because of any actual bug so don't require a stable tag.[1]
>
> There is one more call to kmap() used in ttm_bo_kmap_ttm().  Unfortunately,
> fixing this is not straight forward so it is left to future work.[2]

Patches #2, #4, #6 and #7 are Reviewed-by: Christian König 
<christian.koenig@....com>

How to you now want to push those upstream? I can pick them up for the 
AMD tree like Daniel suggested or you can push them through something else.

Regards,
Christian.

>
> [1] https://lore.kernel.org/lkml/fb71af05-a889-8f6e-031b-426b58a64f00@amd.com/
> [2] https://lore.kernel.org/lkml/20211215210949.GW3538886@iweiny-DESK2.sc.intel.com/
>
>
> 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 | 6 ++----
> 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 | 7 ++-----
> 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(+), 37 deletions(-)
>
> --
> 2.31.1
>