linux-kernel - Re: [PATCH 0/9] drm/i915: Replace kmap_atomic() with kmap_local

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Message-ID: <Y+yGIPcTfirmdIdK@liuzhao-OptiPlex-7080>
Date:   Wed, 15 Feb 2023 15:13:36 +0800
From:   Zhao Liu <zhao1.liu@...ux.intel.com>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Zhao Liu <zhao1.liu@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthew Auld <matthew.auld@...el.com>,
        Thomas Hellstr�m 
        <thomas.hellstrom@...ux.intel.com>,
        Nirmoy Das <nirmoy.das@...el.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Christian K�nig <christian.koenig@....com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        "Fabio M . De Francesco" <fmdefrancesco@...il.com>,
        Zhenyu Wang <zhenyu.z.wang@...el.com>,
        Zhao Liu <zhao1.liu@...el.com>
Subject: Re: [PATCH 0/9] drm/i915: Replace kmap_atomic() with
 kmap_local_page()

On Tue, Feb 14, 2023 at 08:25:08PM -0800, Ira Weiny wrote:
> Date: Tue, 14 Feb 2023 20:25:08 -0800
> From: Ira Weiny <ira.weiny@...el.com>
> Subject: Re: [PATCH 0/9] drm/i915: Replace kmap_atomic() with
>  kmap_local_page()
> 
> Zhao Liu wrote:
> > From: Zhao Liu <zhao1.liu@...el.com>
> > 
> > The use of kmap_atomic() is being deprecated in favor of
> > kmap_local_page()[1].
> 
> Zhao,
> 
> Was there ever a v2 of this series?  I'm not finding it on Lore.

Sorry Ira, my delay is too long, I was busy with other patch work,
I will refresh v2 soon, and push this forward!

Best Regards,
Zhao

> 
> Thanks,
> Ira
> 
> > 
> > In the following patches, we can convert the calls of kmap_atomic() /
> > kunmap_atomic() to kmap_local_page() / kunmap_local(), which can
> > instead do the mapping / unmapping regardless of the context.
> > 
> > With kmap_local_page(), the mapping is per thread, CPU local and not
> > globally visible.
> > 
> > [1]: https://lore.kernel.org/all/20220813220034.806698-1-ira.weiny@intel.com
> > ---
> > Zhao Liu (9):
> >   drm/i915: Use kmap_local_page() in gem/i915_gem_object.c
> >   drm/i915: Use kmap_local_page() in gem/i915_gem_pyhs.c
> >   drm/i915: Use kmap_local_page() in gem/i915_gem_shmem.c
> >   drm/i915: Use kmap_local_page() in gem/selftests/huge_pages.c
> >   drm/i915: Use kmap_local_page() in gem/selftests/i915_gem_coherency.c
> >   drm/i915: Use kmap_local_page() in gem/selftests/i915_gem_context.c
> >   drm/i915: Use memcpy_from_page() in gt/uc/intel_uc_fw.c
> >   drm/i915: Use kmap_local_page() in i915_cmd_parser.c
> >   drm/i915: Use kmap_local_page() in gem/i915_gem_execbuffer.c
> > 
> >  drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c       | 10 +++++-----
> >  drivers/gpu/drm/i915/gem/i915_gem_object.c           |  8 +++-----
> >  drivers/gpu/drm/i915/gem/i915_gem_phys.c             |  8 ++++----
> >  drivers/gpu/drm/i915/gem/i915_gem_shmem.c            |  6 ++++--
> >  drivers/gpu/drm/i915/gem/selftests/huge_pages.c      |  6 +++---
> >  .../gpu/drm/i915/gem/selftests/i915_gem_coherency.c  | 12 ++++--------
> >  .../gpu/drm/i915/gem/selftests/i915_gem_context.c    |  8 ++++----
> >  drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c             |  5 +----
> >  drivers/gpu/drm/i915/i915_cmd_parser.c               |  4 ++--
> >  9 files changed, 30 insertions(+), 37 deletions(-)
> > 
> > -- 
> > 2.34.1
> > 
> 
>