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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lyude Paul , Danilo Krummrich , David Airlie , Simona Vetter , Ralph Campbell , =?UTF-8?q?Mika=20Penttil=C3=A4?= , Matthew Brost , Francois Dugast , Madhavan Srinivasan , Christophe Leroy , Felix Kuehling , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= Subject: [v7 01/16] mm/zone_device: support large zone device private folios Date: Wed, 1 Oct 2025 16:56:52 +1000 Message-ID: <20251001065707.920170-2-balbirs@nvidia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251001065707.920170-1-balbirs@nvidia.com> References: <20251001065707.920170-1-balbirs@nvidia.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: DS7PR03CA0095.namprd03.prod.outlook.com (2603:10b6:5:3b7::10) To PH8PR12MB7277.namprd12.prod.outlook.com (2603:10b6:510:223::13) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR12MB7277:EE_|BL1PR12MB5779:EE_ X-MS-Office365-Filtering-Correlation-Id: 6c37edf8-6ab3-4d8e-e653-08de00b7ddc9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|10070799003|366016; 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When large folios are used, the existing page_free() callback in pgmap is called when the folio is freed, this is true for both PAGE_SIZE and higher order pages. Zone device private large folios do not support deferred split and scan like normal THP folios. Signed-off-by: Balbir Singh Cc: David Hildenbrand Cc: Zi Yan Cc: Joshua Hahn Cc: Rakie Kim Cc: Byungchul Park Cc: Gregory Price Cc: Ying Huang Cc: Alistair Popple Cc: Oscar Salvador Cc: Lorenzo Stoakes Cc: Baolin Wang Cc: "Liam R. Howlett" Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lyude Paul Cc: Danilo Krummrich Cc: David Airlie Cc: Simona Vetter Cc: Ralph Campbell Cc: Mika Penttil=C3=A4 Cc: Matthew Brost Cc: Francois Dugast Cc: Madhavan Srinivasan Cc: Christophe Leroy Cc: Felix Kuehling Cc: Alex Deucher Cc: "Christian K=C3=B6nig" Cc: Andrew Morton --- arch/powerpc/kvm/book3s_hv_uvmem.c | 2 +- drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 2 +- drivers/gpu/drm/drm_pagemap.c | 2 +- drivers/gpu/drm/nouveau/nouveau_dmem.c | 2 +- include/linux/memremap.h | 10 ++++++++- lib/test_hmm.c | 2 +- mm/memremap.c | 26 ++++++++++++++---------- mm/rmap.c | 6 +++++- 8 files changed, 34 insertions(+), 18 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_h= v_uvmem.c index 03f8c34fa0a2..91f763410673 100644 --- a/arch/powerpc/kvm/book3s_hv_uvmem.c +++ b/arch/powerpc/kvm/book3s_hv_uvmem.c @@ -723,7 +723,7 @@ static struct page *kvmppc_uvmem_get_page(unsigned long= gpa, struct kvm *kvm) =20 dpage =3D pfn_to_page(uvmem_pfn); dpage->zone_device_data =3D pvt; - zone_device_page_init(dpage); + zone_device_page_init(dpage, 0); return dpage; out_clear: spin_lock(&kvmppc_uvmem_bitmap_lock); diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd= /amdkfd/kfd_migrate.c index 79251f22b702..d0e2cae33035 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c @@ -217,7 +217,7 @@ svm_migrate_get_vram_page(struct svm_range *prange, uns= igned long pfn) page =3D pfn_to_page(pfn); svm_range_bo_ref(prange->svm_bo); page->zone_device_data =3D prange->svm_bo; - zone_device_page_init(page); + zone_device_page_init(page, 0); } =20 static void diff --git a/drivers/gpu/drm/drm_pagemap.c b/drivers/gpu/drm/drm_pagemap.c index 1da55322af12..31c53f724e25 100644 --- a/drivers/gpu/drm/drm_pagemap.c +++ b/drivers/gpu/drm/drm_pagemap.c @@ -196,7 +196,7 @@ static void drm_pagemap_get_devmem_page(struct page *pa= ge, struct drm_pagemap_zdd *zdd) { page->zone_device_data =3D drm_pagemap_zdd_get(zdd); - zone_device_page_init(page); + zone_device_page_init(page, 0); } =20 /** diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouve= au/nouveau_dmem.c index ca4932a150e3..53cc1926b9da 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c @@ -318,7 +318,7 @@ nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm) return NULL; } =20 - zone_device_page_init(page); + zone_device_page_init(page, 0); return page; } =20 diff --git a/include/linux/memremap.h b/include/linux/memremap.h index e5951ba12a28..d2487a19cba2 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -206,7 +206,7 @@ static inline bool is_fsdax_page(const struct page *pag= e) } =20 #ifdef CONFIG_ZONE_DEVICE -void zone_device_page_init(struct page *page); +void zone_device_page_init(struct page *page, unsigned int order); void *memremap_pages(struct dev_pagemap *pgmap, int nid); void memunmap_pages(struct dev_pagemap *pgmap); void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap); @@ -215,6 +215,14 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn); bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn); =20 unsigned long memremap_compat_align(void); + +static inline void zone_device_folio_init(struct folio *folio, unsigned in= t order) +{ + zone_device_page_init(&folio->page, order); + if (order) + folio_set_large_rmappable(folio); +} + #else static inline void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) diff --git a/lib/test_hmm.c b/lib/test_hmm.c index 83e3d8208a54..24d82121cde8 100644 --- a/lib/test_hmm.c +++ b/lib/test_hmm.c @@ -627,7 +627,7 @@ static struct page *dmirror_devmem_alloc_page(struct dm= irror_device *mdevice) goto error; } =20 - zone_device_page_init(dpage); + zone_device_page_init(dpage, 0); dpage->zone_device_data =3D rpage; return dpage; =20 diff --git a/mm/memremap.c b/mm/memremap.c index 46cb1b0b6f72..e45dfb568710 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -416,20 +416,19 @@ EXPORT_SYMBOL_GPL(get_dev_pagemap); void free_zone_device_folio(struct folio *folio) { struct dev_pagemap *pgmap =3D folio->pgmap; + unsigned long nr =3D folio_nr_pages(folio); + int i; =20 if (WARN_ON_ONCE(!pgmap)) return; =20 mem_cgroup_uncharge(folio); =20 - /* - * Note: we don't expect anonymous compound pages yet. Once supported - * and we could PTE-map them similar to THP, we'd have to clear - * PG_anon_exclusive on all tail pages. - */ if (folio_test_anon(folio)) { - VM_BUG_ON_FOLIO(folio_test_large(folio), folio); - __ClearPageAnonExclusive(folio_page(folio, 0)); + for (i =3D 0; i < nr; i++) + __ClearPageAnonExclusive(folio_page(folio, i)); + } else { + VM_WARN_ON_ONCE(folio_test_large(folio)); } =20 /* @@ -456,8 +455,8 @@ void free_zone_device_folio(struct folio *folio) case MEMORY_DEVICE_COHERENT: if (WARN_ON_ONCE(!pgmap->ops || !pgmap->ops->page_free)) break; - pgmap->ops->page_free(folio_page(folio, 0)); - put_dev_pagemap(pgmap); + pgmap->ops->page_free(&folio->page); + percpu_ref_put_many(&folio->pgmap->ref, nr); break; =20 case MEMORY_DEVICE_GENERIC: @@ -480,14 +479,19 @@ void free_zone_device_folio(struct folio *folio) } } =20 -void zone_device_page_init(struct page *page) +void zone_device_page_init(struct page *page, unsigned int order) { + VM_WARN_ON_ONCE(order > MAX_ORDER_NR_PAGES); + /* * Drivers shouldn't be allocating pages after calling * memunmap_pages(). */ - WARN_ON_ONCE(!percpu_ref_tryget_live(&page_pgmap(page)->ref)); + WARN_ON_ONCE(!percpu_ref_tryget_many(&page_pgmap(page)->ref, 1 << order)); set_page_count(page, 1); lock_page(page); + + if (order) + prep_compound_page(page, order); } EXPORT_SYMBOL_GPL(zone_device_page_init); diff --git a/mm/rmap.c b/mm/rmap.c index ac4f783d6ec2..9bab13429975 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1757,9 +1757,13 @@ static __always_inline void __folio_remove_rmap(stru= ct folio *folio, * the folio is unmapped and at least one page is still mapped. * * Check partially_mapped first to ensure it is a large folio. + * + * Device private folios do not support deferred splitting and + * shrinker based scanning of the folios to free. */ if (partially_mapped && folio_test_anon(folio) && - !folio_test_partially_mapped(folio)) + !folio_test_partially_mapped(folio) && + !folio_is_device_private(folio)) deferred_split_folio(folio, true); =20 __folio_mod_stat(folio, -nr, -nr_pmdmapped); --=20 2.51.0