linux-kernel - [PATCH hmm v2 0/5] Adjust hmm_range

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Date:   Fri,  1 May 2020 15:20:43 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     linux-mm@...ck.org, Ralph Campbell <rcampbell@...dia.com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        amd-gfx@...ts.freedesktop.org, Ben Skeggs <bskeggs@...hat.com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        dri-devel@...ts.freedesktop.org,
        Felix Kuehling <Felix.Kuehling@....com>,
        Christoph Hellwig <hch@....de>,
        intel-gfx@...ts.freedesktop.org,
        Jérôme Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        linux-kernel@...r.kernel.org,
        Niranjana Vishwanathapura <niranjana.vishwanathapura@...el.com>,
        nouveau@...ts.freedesktop.org, "Yang, Philip" <Philip.Yang@....com>
Subject: [PATCH hmm v2 0/5] Adjust hmm_range_fault() API

From: Jason Gunthorpe <jgg@...lanox.com>

The API is a bit complicated for the uses we actually have, and
disucssions for simplifying have come up a number of times.

This small series removes the customizable pfn format and simplifies the
return code of hmm_range_fault()

All the drivers are adjusted to process in the simplified format.
I would appreciated tested-by's for the two drivers, thanks!

v2:
 - Move call chain to commit message
 - Fix typo of HMM_PFN_REQ_FAULT
 - Move nouveau_hmm_convert_pfn() to nouveau_svm.c
 - Add acks and tested-bys
v1: https://lore.kernel.org/r/0-v1-4eb72686de3c+5062-hmm_no_flags_jgg@mellanox.com

Cc: Christoph Hellwig <hch@....de>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Jérôme Glisse <jglisse@...hat.com>
Cc: Ben Skeggs <bskeggs@...hat.com>
To: Ralph Campbell <rcampbell@...dia.com>
Cc: nouveau@...ts.freedesktop.org
Cc: Niranjana Vishwanathapura <niranjana.vishwanathapura@...el.com>
Cc: intel-gfx@...ts.freedesktop.org
Cc: "Kuehling, Felix" <Felix.Kuehling@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: "Christian König" <christian.koenig@....com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@....com>
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
Cc: "Yang, Philip" <Philip.Yang@....com>
To: linux-mm@...ck.org

Jason Gunthorpe (5):
  mm/hmm: make CONFIG_DEVICE_PRIVATE into a select
  mm/hmm: make hmm_range_fault return 0 or -1
  drm/amdgpu: remove dead code after hmm_range_fault()
  mm/hmm: remove HMM_PFN_SPECIAL
  mm/hmm: remove the customizable pfn format from hmm_range_fault

 Documentation/vm/hmm.rst                |  28 ++--
 arch/powerpc/Kconfig                    |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |  56 +++----
 drivers/gpu/drm/nouveau/Kconfig         |   2 +-
 drivers/gpu/drm/nouveau/nouveau_dmem.c  |  27 +---
 drivers/gpu/drm/nouveau/nouveau_dmem.h  |   3 +-
 drivers/gpu/drm/nouveau/nouveau_svm.c   |  94 ++++++++----
 include/linux/hmm.h                     | 109 +++++---------
 mm/Kconfig                              |   7 +-
 mm/hmm.c                                | 185 +++++++++++-------------
 10 files changed, 217 insertions(+), 296 deletions(-)

-- 
2.26.2