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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Balbir Singh , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org, Francois Dugast Subject: [PATCH v5 1/5] mm/zone_device: Reinitialize large zone device private folios Date: Wed, 14 Jan 2026 20:19:52 +0100 Message-ID: <20260114192111.1267147-2-francois.dugast@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260114192111.1267147-1-francois.dugast@intel.com> References: <20260114192111.1267147-1-francois.dugast@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: xesx6bbxuytj161cpj357uxofc31iocw X-Rspam-User: X-Rspamd-Queue-Id: 349992000D X-Rspamd-Server: rspam08 X-HE-Tag: 1768418509-775613 X-HE-Meta: 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 rNsyedQd 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Matthew Brost Reinitialize metadata for large zone device private folios in zone_device_page_init prior to creating a higher-order zone device private folio. This step is necessary when the folio’s order changes dynamically between zone_device_page_init calls to avoid building a corrupt folio. As part of the metadata reinitialization, the dev_pagemap must be passed in from the caller because the pgmap stored in the folio page may have been overwritten with a compound head. Cc: Zi Yan Cc: Alistair Popple Cc: adhavan Srinivasan Cc: Nicholas Piggin Cc: Michael Ellerman Cc: "Christophe Leroy (CS GROUP)" Cc: Felix Kuehling Cc: Alex Deucher Cc: "Christian König" Cc: David Airlie Cc: Simona Vetter Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: Lyude Paul Cc: Danilo Krummrich Cc: David Hildenbrand Cc: Oscar Salvador Cc: Andrew Morton Cc: Jason Gunthorpe Cc: Leon Romanovsky Cc: Lorenzo Stoakes Cc: Liam R. Howlett Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Balbir Singh Cc: linuxppc-dev@lists.ozlabs.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: amd-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Cc: nouveau@lists.freedesktop.org Cc: linux-mm@kvack.org Cc: linux-cxl@vger.kernel.org Fixes: d245f9b4ab80 ("mm/zone_device: support large zone device private folios") Signed-off-by: Matthew Brost Signed-off-by: Francois Dugast --- 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 | 9 ++++++--- lib/test_hmm.c | 4 +++- mm/memremap.c | 20 +++++++++++++++++++- 7 files changed, 32 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c index e5000bef90f2..7cf9310de0ec 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) dpage = pfn_to_page(uvmem_pfn); dpage->zone_device_data = pvt; - zone_device_page_init(dpage, 0); + zone_device_page_init(dpage, &kvmppc_uvmem_pgmap, 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 af53e796ea1b..6ada7b4af7c6 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, unsigned long pfn) page = pfn_to_page(pfn); svm_range_bo_ref(prange->svm_bo); page->zone_device_data = prange->svm_bo; - zone_device_page_init(page, 0); + zone_device_page_init(page, page_pgmap(page), 0); } static void diff --git a/drivers/gpu/drm/drm_pagemap.c b/drivers/gpu/drm/drm_pagemap.c index 03ee39a761a4..c497726b0147 100644 --- a/drivers/gpu/drm/drm_pagemap.c +++ b/drivers/gpu/drm/drm_pagemap.c @@ -201,7 +201,7 @@ static void drm_pagemap_get_devmem_page(struct page *page, struct drm_pagemap_zdd *zdd) { page->zone_device_data = drm_pagemap_zdd_get(zdd); - zone_device_page_init(page, 0); + zone_device_page_init(page, zdd->dpagemap->pagemap, 0); } /** diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c index 58071652679d..3d8031296eed 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c @@ -425,7 +425,7 @@ nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm, bool is_large) order = ilog2(DMEM_CHUNK_NPAGES); } - zone_device_folio_init(folio, order); + zone_device_folio_init(folio, page_pgmap(folio_page(folio, 0)), order); return page; } diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 713ec0435b48..e3c2ccf872a8 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -224,7 +224,8 @@ static inline bool is_fsdax_page(const struct page *page) } #ifdef CONFIG_ZONE_DEVICE -void zone_device_page_init(struct page *page, unsigned int order); +void zone_device_page_init(struct page *page, struct dev_pagemap *pgmap, + 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); @@ -234,9 +235,11 @@ bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn); unsigned long memremap_compat_align(void); -static inline void zone_device_folio_init(struct folio *folio, unsigned int order) +static inline void zone_device_folio_init(struct folio *folio, + struct dev_pagemap *pgmap, + unsigned int order) { - zone_device_page_init(&folio->page, order); + zone_device_page_init(&folio->page, pgmap, order); if (order) folio_set_large_rmappable(folio); } diff --git a/lib/test_hmm.c b/lib/test_hmm.c index 8af169d3873a..455a6862ae50 100644 --- a/lib/test_hmm.c +++ b/lib/test_hmm.c @@ -662,7 +662,9 @@ static struct page *dmirror_devmem_alloc_page(struct dmirror *dmirror, goto error; } - zone_device_folio_init(page_folio(dpage), order); + zone_device_folio_init(page_folio(dpage), + page_pgmap(folio_page(page_folio(dpage), 0)), + order); dpage->zone_device_data = rpage; return dpage; diff --git a/mm/memremap.c b/mm/memremap.c index 63c6ab4fdf08..6f46ab14662b 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -477,10 +477,28 @@ void free_zone_device_folio(struct folio *folio) } } -void zone_device_page_init(struct page *page, unsigned int order) +void zone_device_page_init(struct page *page, struct dev_pagemap *pgmap, + unsigned int order) { + struct page *new_page = page; + unsigned int i; + VM_WARN_ON_ONCE(order > MAX_ORDER_NR_PAGES); + for (i = 0; i < (1UL << order); ++i, ++new_page) { + struct folio *new_folio = (struct folio *)new_page; + + new_page->flags.f &= ~0xffUL; /* Clear possible order, page head */ +#ifdef NR_PAGES_IN_LARGE_FOLIO + ((struct folio *)(new_page - 1))->_nr_pages = 0; +#endif + new_folio->mapping = NULL; + new_folio->pgmap = pgmap; /* Also clear compound head */ + new_folio->share = 0; /* fsdax only, unused for device private */ + VM_WARN_ON_FOLIO(folio_ref_count(new_folio), new_folio); + VM_WARN_ON_FOLIO(!folio_is_zone_device(new_folio), new_folio); + } + /* * Drivers shouldn't be allocating pages after calling * memunmap_pages(). -- 2.43.0