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9k/kkCFne8IsPF8WwvGHTFa5JpgLHOIprxn7/lv1/CsnNAwpQetpLxjOrnNjpeaX6V9o/3wNy+YYm1hqXdaHOQ== 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: On 10/12/25 17:10, Lance Yang wrote: > Hi Balbir, > > Just one nit below :) > > On Wed, Oct 1, 2025 at 3:43 PM Balbir Singh wrote: >> >> Add routines to support allocation of large order zone device folios >> and helper functions for zone device folios, to check if a folio is >> device private and helpers for setting zone device data. >> >> 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 Penttilä >> Cc: Matthew Brost >> Cc: Francois Dugast >> Cc: Madhavan Srinivasan >> Cc: Christophe Leroy >> Cc: Felix Kuehling >> Cc: Alex Deucher >> Cc: "Christian König" >> 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_hv_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) >> >> dpage = pfn_to_page(uvmem_pfn); >> dpage->zone_device_data = 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, 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); >> + zone_device_page_init(page, 0); >> } >> >> 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 *page, >> struct drm_pagemap_zdd *zdd) >> { >> page->zone_device_data = drm_pagemap_zdd_get(zdd); >> - zone_device_page_init(page); >> + zone_device_page_init(page, 0); >> } >> >> /** >> diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/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; >> } >> >> - zone_device_page_init(page); >> + zone_device_page_init(page, 0); >> return page; >> } >> >> 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 *page) >> } >> >> #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); >> >> unsigned long memremap_compat_align(void); >> + >> +static inline void zone_device_folio_init(struct folio *folio, unsigned int 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 dmirror_device *mdevice) >> goto error; >> } >> >> - zone_device_page_init(dpage); >> + zone_device_page_init(dpage, 0); >> dpage->zone_device_data = rpage; >> return dpage; >> >> 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 = folio->pgmap; >> + unsigned long nr = folio_nr_pages(folio); >> + int i; >> >> if (WARN_ON_ONCE(!pgmap)) >> return; >> >> mem_cgroup_uncharge(folio); >> >> - /* >> - * 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 = 0; i < nr; i++) >> + __ClearPageAnonExclusive(folio_page(folio, i)); >> + } else { >> + VM_WARN_ON_ONCE(folio_test_large(folio)); >> } >> >> /* >> @@ -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); > > Nit: &pgmap->ref here for consistency? Can be done, thanks! Balbir