For the nouveau bits:
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
On Fri, 2022-10-14 at 16:59 -0700, Dan Williams wrote:
> Switch to the common method, shared across all MEMORY_DEVICE_* types,
> for requesting access to a ZONE_DEVICE page. The
> MEMORY_DEVICE_{PRIVATE,COHERENT} specific expectation that newly
> requested pages are locked is moved to the callers.
>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Cc: Jan Kara <jack@xxxxxxx>
> Cc: "Darrick J. Wong" <djwong@xxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: John Hubbard <jhubbard@xxxxxxxxxx>
> Cc: Alistair Popple <apopple@xxxxxxxxxx>
> Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: "Christian König" <christian.koenig@xxxxxxx>
> Cc: "Pan, Xinhui" <Xinhui.Pan@xxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
> Cc: Karol Herbst <kherbst@xxxxxxxxxx>
> Cc: Lyude Paul <lyude@xxxxxxxxxx>
> Cc: "Jérôme Glisse" <jglisse@xxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
> arch/powerpc/kvm/book3s_hv_uvmem.c | 3 ++-
> drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 3 ++-
> drivers/gpu/drm/nouveau/nouveau_dmem.c | 3 ++-
> include/linux/memremap.h | 1 -
> lib/test_hmm.c | 3 ++-
> mm/memremap.c | 13 +------------
> 6 files changed, 9 insertions(+), 17 deletions(-)
>
> diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c
> index e2f11f9c3f2a..884ec112ad43 100644
> --- a/arch/powerpc/kvm/book3s_hv_uvmem.c
> +++ b/arch/powerpc/kvm/book3s_hv_uvmem.c
> @@ -718,7 +718,8 @@ 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);
> + pgmap_request_folios(dpage->pgmap, page_folio(dpage), 1);
> + lock_page(dpage);
> 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 97a684568ae0..8cf97060122b 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> @@ -223,7 +223,8 @@ 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);
> + pgmap_request_folios(page->pgmap, page_folio(page), 1);
> + lock_page(page);
> }
>
> static void
> diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
> index 5fe209107246..1482533c7ca0 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
> @@ -324,7 +324,8 @@ nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm)
> return NULL;
> }
>
> - zone_device_page_init(page);
> + pgmap_request_folios(page->pgmap, page_folio(page), 1);
> + lock_page(page);
> return page;
> }
>
> diff --git a/include/linux/memremap.h b/include/linux/memremap.h
> index 98196b8d3172..3fb3809d71f3 100644
> --- a/include/linux/memremap.h
> +++ b/include/linux/memremap.h
> @@ -187,7 +187,6 @@ static inline bool folio_is_device_coherent(const struct folio *folio)
> }
>
> #ifdef CONFIG_ZONE_DEVICE
> -void zone_device_page_init(struct page *page);
> 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);
> diff --git a/lib/test_hmm.c b/lib/test_hmm.c
> index 67e6f83fe0f8..e4f7219ae3bb 100644
> --- a/lib/test_hmm.c
> +++ b/lib/test_hmm.c
> @@ -632,7 +632,8 @@ static struct page *dmirror_devmem_alloc_page(struct dmirror_device *mdevice)
> goto error;
> }
>
> - zone_device_page_init(dpage);
> + pgmap_request_folios(dpage->pgmap, page_folio(dpage), 1);
> + lock_page(dpage);
> dpage->zone_device_data = rpage;
> return dpage;
>
> diff --git a/mm/memremap.c b/mm/memremap.c
> index 87a649ecdc54..c46e700f5245 100644
> --- a/mm/memremap.c
> +++ b/mm/memremap.c
> @@ -518,18 +518,6 @@ void free_zone_device_page(struct page *page)
> put_dev_pagemap(page->pgmap);
> }
>
> -void zone_device_page_init(struct page *page)
> -{
> - /*
> - * Drivers shouldn't be allocating pages after calling
> - * memunmap_pages().
> - */
> - WARN_ON_ONCE(!percpu_ref_tryget_live(&page->pgmap->ref));
> - set_page_count(page, 1);
> - lock_page(page);
> -}
> -EXPORT_SYMBOL_GPL(zone_device_page_init);
> -
> static bool folio_span_valid(struct dev_pagemap *pgmap, struct folio *folio,
> int nr_folios)
> {
> @@ -586,6 +574,7 @@ bool pgmap_request_folios(struct dev_pagemap *pgmap, struct folio *folio,
>
> return true;
> }
> +EXPORT_SYMBOL_GPL(pgmap_request_folios);
>
> void pgmap_release_folios(struct dev_pagemap *pgmap, struct folio *folio, int nr_folios)
> {
>
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
