Message-ID: <20260111205820.830410-1-francois.dugast@intel.com>
Date: Sun, 11 Jan 2026 21:55:39 +0100
From: Francois Dugast <francois.dugast@...el.com>
To: intel-xe@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org,
	Francois Dugast <francois.dugast@...el.com>,
	Zi Yan <ziy@...dia.com>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Alistair Popple <apopple@...dia.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Mike Rapoport <rppt@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Nicholas Piggin <npiggin@...il.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Christophe Leroy (CS GROUP)" <chleroy@...nel.org>,
	Felix Kuehling <Felix.Kuehling@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Lyude Paul <lyude@...hat.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	David Hildenbrand <david@...nel.org>,
	Oscar Salvador <osalvador@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	Balbir Singh <balbirs@...dia.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Matthew Wilcox <willy@...radead.org>,
	Jan Kara <jack@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	linuxppc-dev@...ts.ozlabs.org,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	amd-gfx@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org,
	linux-pci@...r.kernel.org,
	linux-mm@...ck.org,
	linux-cxl@...r.kernel.org,
	nvdimm@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH v4 0/7] Enable THP support in drm_pagemap

Use Balbir Singh's series for device-private THP support [1] and
previous preparation work in drm_pagemap [2] to add 2MB/THP support
in xe. This leads to significant performance improvements when using
SVM with 2MB pages.

[1] https://lore.kernel.org/linux-mm/20251001065707.920170-1-balbirs@nvidia.com/
[2] https://patchwork.freedesktop.org/series/151754/

v2:
- rebase on top of multi-device SVM
- add drm_pagemap_cpages() with temporary patch
- address other feedback from Matt Brost on v1

v3:
The major change is to remove the dependency to the mm/huge_memory
helper migrate_device_split_page() that was called explicitely when
a 2M buddy allocation backed by a large folio would be later reused
for a smaller allocation (4K or 64K). Instead, the first 3 patches
provided by Matthew Brost ensure large folios are split at the time
of freeing.

v4:
- add order argument to folio_free callback
- send complete series to linux-mm and MM folks as requested (Zi Yan
  and Andrew Morton) and cover letter to anyone receiving at least
  one of the patches (Liam R. Howlett)

Cc: Zi Yan <ziy@...dia.com>
Cc: Madhavan Srinivasan <maddy@...ux.ibm.com>
Cc: Alistair Popple <apopple@...dia.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Liam R. Howlett <Liam.Howlett@...cle.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>
Cc: Felix Kuehling <Felix.Kuehling@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: "Christian König" <christian.koenig@....com>
Cc: David Airlie <airlied@...il.com>
Cc: Simona Vetter <simona@...ll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Maxime Ripard <mripard@...nel.org>
Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Lyude Paul <lyude@...hat.com>
Cc: Danilo Krummrich <dakr@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Logan Gunthorpe <logang@...tatee.com>
Cc: David Hildenbrand <david@...nel.org>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: Balbir Singh <balbirs@...dia.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Jan Kara <jack@...e.cz>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Cc: nouveau@...ts.freedesktop.org
Cc: linux-pci@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: linux-cxl@...r.kernel.org
Cc: nvdimm@...ts.linux.dev
Cc: linux-fsdevel@...r.kernel.org

Francois Dugast (3):
  drm/pagemap: Unlock and put folios when possible
  drm/pagemap: Add helper to access zone_device_data
  drm/pagemap: Enable THP support for GPU memory migration

Matthew Brost (4):
  mm/zone_device: Add order argument to folio_free callback
  mm/zone_device: Add free_zone_device_folio_prepare() helper
  fs/dax: Use free_zone_device_folio_prepare() helper
  drm/pagemap: Correct cpages calculation for migrate_vma_setup

 arch/powerpc/kvm/book3s_hv_uvmem.c       |   2 +-
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c |   2 +-
 drivers/gpu/drm/drm_gpusvm.c             |   7 +-
 drivers/gpu/drm/drm_pagemap.c            | 165 ++++++++++++++++++-----
 drivers/gpu/drm/nouveau/nouveau_dmem.c   |   4 +-
 drivers/pci/p2pdma.c                     |   2 +-
 fs/dax.c                                 |  24 +---
 include/drm/drm_pagemap.h                |  15 +++
 include/linux/memremap.h                 |   8 +-
 lib/test_hmm.c                           |   4 +-
 mm/memremap.c                            |  60 ++++++++-
 11 files changed, 227 insertions(+), 66 deletions(-)

-- 
2.43.0

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