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Wed, 05 Mar 2025 07:26:46 -0800 (PST) X-Google-Smtp-Source: AGHT+IECYyXVd+Gb6leHDb5NO82ag7tQipklHOXKqXQqY4fydYrcJZzPu+CjaBp7aum4qt8U11Vpow== X-Received: by 2002:a05:6a00:998:b0:736:46b4:beef with SMTP id d2e1a72fcca58-73682b55144mr6706526b3a.3.1741188406066; Wed, 05 Mar 2025 07:26:46 -0800 (PST) Received: from zeus.elecom ([240b:10:83a2:bd00:6e35:f2f5:2e21:ae3a]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7364b4eff66sm6983292b3a.83.2025.03.05.07.26.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Mar 2025 07:26:45 -0800 (PST) From: Ryosuke Yasuoka To: maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, kraxel@redhat.com, gurchetansingh@chromium.org, olvaffe@gmail.com, akpm@linux-foundation.org, urezki@gmail.com, hch@infradead.org, dmitry.osipenko@collabora.com, jfalempe@redhat.com Cc: Ryosuke Yasuoka , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org Subject: [PATCH drm-next 2/2] drm/virtio: Use atomic_vmap to work drm_panic in GUI Date: Thu, 6 Mar 2025 00:25:54 +0900 Message-ID: <20250305152555.318159-3-ryasuoka@redhat.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250305152555.318159-1-ryasuoka@redhat.com> References: <20250305152555.318159-1-ryasuoka@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" virtio drm_panic supports only vmapped shmem BO because there is no atomic vmap feature. Now atomic_vmap is supported, so drm_panic tries to vmap addr if it is not mapped. Signed-off-by: Ryosuke Yasuoka --- drivers/gpu/drm/drm_gem.c | 51 ++++++++++++++++++++++++++ drivers/gpu/drm/drm_gem_shmem_helper.c | 51 ++++++++++++++++++++++++++ drivers/gpu/drm/virtio/virtgpu_plane.c | 14 +++++-- include/drm/drm_gem.h | 1 + include/drm/drm_gem_shmem_helper.h | 2 + 5 files changed, 116 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index ee811764c3df..eebfaef3a52e 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -535,6 +535,57 @@ static void drm_gem_check_release_batch(struct folio_b= atch *fbatch) cond_resched(); } =20 +struct page **drm_gem_atomic_get_pages(struct drm_gem_object *obj) +{ + struct address_space *mapping; + struct page **pages; + struct folio *folio; + long i, j, npages; + + if (WARN_ON(!obj->filp)) + return ERR_PTR(-EINVAL); + + /* This is the shared memory object that backs the GEM resource */ + mapping =3D obj->filp->f_mapping; + + /* We already BUG_ON() for non-page-aligned sizes in + * drm_gem_object_init(), so we should never hit this unless + * driver author is doing something really wrong: + */ + WARN_ON((obj->size & (PAGE_SIZE - 1)) !=3D 0); + + npages =3D obj->size >> PAGE_SHIFT; + + pages =3D kmalloc_array(npages, sizeof(struct page *), GFP_ATOMIC); + if (pages =3D=3D NULL) + return ERR_PTR(-ENOMEM); + + mapping_set_unevictable(mapping); + + i =3D 0; + while (i < npages) { + long nr; + + folio =3D shmem_read_folio_gfp(mapping, i, + GFP_ATOMIC); + if (IS_ERR(folio)) + return ERR_PTR(-ENOMEM); + nr =3D min(npages - i, folio_nr_pages(folio)); + for (j =3D 0; j < nr; j++, i++) + pages[i] =3D folio_file_page(folio, i); + + /* Make sure shmem keeps __GFP_DMA32 allocated pages in the + * correct region during swapin. Note that this requires + * __GFP_DMA32 to be set in mapping_gfp_mask(inode->i_mapping) + * so shmem can relocate pages during swapin if required. + */ + BUG_ON(mapping_gfp_constraint(mapping, __GFP_DMA32) && + (folio_pfn(folio) >=3D 0x00100000UL)); + } + + return pages; +} + /** * drm_gem_get_pages - helper to allocate backing pages for a GEM object * from shmem diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_g= em_shmem_helper.c index 5ab351409312..789dfd726a36 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -186,6 +186,34 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *s= hmem) } EXPORT_SYMBOL_GPL(drm_gem_shmem_free); =20 +static int drm_gem_shmem_atomic_get_pages(struct drm_gem_shmem_object *shm= em) +{ + struct drm_gem_object *obj =3D &shmem->base; + struct page **pages; + + pages =3D drm_gem_atomic_get_pages(obj); + if (IS_ERR(pages)) { + drm_dbg_kms(obj->dev, "Failed to get pages (%ld)\n", + PTR_ERR(pages)); + shmem->pages_use_count =3D 0; + return PTR_ERR(pages); + } + + /* + * TODO: Allocating WC pages which are correctly flushed is only + * supported on x86. Ideal solution would be a GFP_WC flag, which also + * ttm_pool.c could use. + */ +#ifdef CONFIG_X86 + if (shmem->map_wc) + set_pages_array_wc(pages, obj->size >> PAGE_SHIFT); +#endif + + shmem->pages =3D pages; + + return 0; +} + static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem) { struct drm_gem_object *obj =3D &shmem->base; @@ -317,6 +345,29 @@ void drm_gem_shmem_unpin(struct drm_gem_shmem_object *= shmem) } EXPORT_SYMBOL(drm_gem_shmem_unpin); =20 +int drm_gem_shmem_atomic_vmap(struct drm_gem_shmem_object *shmem, + struct iosys_map *map) +{ + struct drm_gem_object *obj =3D &shmem->base; + int ret =3D 0; + + pgprot_t prot =3D PAGE_KERNEL; + + ret =3D drm_gem_shmem_atomic_get_pages(shmem); + if (ret) + return -ENOMEM; + + if (shmem->map_wc) + prot =3D pgprot_writecombine(prot); + shmem->vaddr =3D atomic_vmap(shmem->pages, obj->size >> PAGE_SHIFT, + VM_MAP, prot); + if (!shmem->vaddr) + return -ENOMEM; + iosys_map_set_vaddr(map, shmem->vaddr); + + return 0; +} + /* * drm_gem_shmem_vmap - Create a virtual mapping for a shmem GEM object * @shmem: shmem GEM object diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virti= o/virtgpu_plane.c index a6f5a78f436a..2a977c5cf42a 100644 --- a/drivers/gpu/drm/virtio/virtgpu_plane.c +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c @@ -500,11 +500,19 @@ static int virtio_drm_get_scanout_buffer(struct drm_p= lane *plane, =20 bo =3D gem_to_virtio_gpu_obj(plane->state->fb->obj[0]); =20 - /* Only support mapped shmem bo */ - if (virtio_gpu_is_vram(bo) || bo->base.base.import_attach || !bo->base.va= ddr) + if (virtio_gpu_is_vram(bo) || bo->base.base.import_attach) return -ENODEV; =20 - iosys_map_set_vaddr(&sb->map[0], bo->base.vaddr); + /* try to vmap it if possible */ + if (!bo->base.vaddr) { + int ret; + + ret =3D drm_gem_shmem_atomic_vmap(&bo->base, &sb->map[0]); + if (ret) + return ret; + } else { + iosys_map_set_vaddr(&sb->map[0], bo->base.vaddr); + } =20 sb->format =3D plane->state->fb->format; sb->height =3D plane->state->fb->height; diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index fdae947682cd..cfed66bc12ef 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -529,6 +529,7 @@ void drm_gem_free_mmap_offset(struct drm_gem_object *ob= j); int drm_gem_create_mmap_offset(struct drm_gem_object *obj); int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t siz= e); =20 +struct page **drm_gem_atomic_get_pages(struct drm_gem_object *obj); struct page **drm_gem_get_pages(struct drm_gem_object *obj); void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, bool dirty, bool accessed); diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem= _helper.h index d22e3fb53631..86a357945f42 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -105,6 +105,8 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *sh= mem); void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem); int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem); void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem); +int drm_gem_shmem_atomic_vmap(struct drm_gem_shmem_object *shmem, + struct iosys_map *map); int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem, struct iosys_map *map); void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem, --=20 2.48.1