This patch adds vmap_local and vunmap_local to struct drm_gem_object_funcs; including the PRIME helpers to connect with dma-buf's related interfaces.
Besides the generic DRM core, this will become relevant for fbdev emulation with virtio, so we update it as well.
v4: * update documentation (Daniel)
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch --- drivers/gpu/drm/drm_gem.c | 28 ++++++++++++++++++ drivers/gpu/drm/drm_internal.h | 2 ++ drivers/gpu/drm/drm_prime.c | 39 ++++++++++++++++++++++++++ drivers/gpu/drm/virtio/virtgpu_prime.c | 2 ++ include/drm/drm_gem.h | 21 ++++++++++++++ include/drm/drm_prime.h | 2 ++ 6 files changed, 94 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 92f89cee213e..6e131d9bb7bd 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -1234,6 +1234,34 @@ void drm_gem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) dma_buf_map_clear(map); }
+int drm_gem_vmap_local(struct drm_gem_object *obj, struct dma_buf_map *map) +{ + int ret; + + if (!obj->funcs->vmap_local) + return -EOPNOTSUPP; + + ret = obj->funcs->vmap_local(obj, map); + if (ret) + return ret; + else if (dma_buf_map_is_null(map)) + return -ENOMEM; + + return 0; +} + +void drm_gem_vunmap_local(struct drm_gem_object *obj, struct dma_buf_map *map) +{ + if (dma_buf_map_is_null(map)) + return; + + if (obj->funcs->vunmap_local) + obj->funcs->vunmap_local(obj, map); + + /* Always set the mapping to NULL. Callers may rely on this. */ + dma_buf_map_clear(map); +} + /** * drm_gem_lock_reservations - Sets up the ww context and acquires * the lock on an array of GEM objects. diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index 81d386b5b92a..b0bf6aba763a 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -190,6 +190,8 @@ int drm_gem_pin(struct drm_gem_object *obj); void drm_gem_unpin(struct drm_gem_object *obj); int drm_gem_vmap(struct drm_gem_object *obj, struct dma_buf_map *map); void drm_gem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map); +int drm_gem_vmap_local(struct drm_gem_object *obj, struct dma_buf_map *map); +void drm_gem_vunmap_local(struct drm_gem_object *obj, struct dma_buf_map *map);
/* drm_debugfs.c drm_debugfs_crc.c */ #if defined(CONFIG_DEBUG_FS) diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 683aa29ecd3b..633edea76985 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -695,6 +695,43 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, struct dma_buf_map *map) } EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
+/** + * drm_gem_dmabuf_vmap_local - dma_buf vmap_local implementation for GEM + * @dma_buf: buffer to be mapped + * @map: the virtual address of the buffer + * + * Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap_local + * callback. Calls into &drm_gem_object_funcs.vmap_local for device specific handling. + * The kernel virtual address is returned in map. + * + * Returns: + * 0 on success or a negative errno code otherwise. + */ +int drm_gem_dmabuf_vmap_local(struct dma_buf *dma_buf, struct dma_buf_map *map) +{ + struct drm_gem_object *obj = dma_buf->priv; + + return drm_gem_vmap_local(obj, map); +} +EXPORT_SYMBOL(drm_gem_dmabuf_vmap_local); + +/** + * drm_gem_dmabuf_vunmap_local - dma_buf vunmap_local implementation for GEM + * @dma_buf: buffer to be unmapped + * @map: the virtual address of the buffer + * + * Releases a kernel virtual mapping. This can be used as the + * &dma_buf_ops.vunmap_local callback. Calls into &drm_gem_object_funcs.vunmap_local + * for device specific handling. + */ +void drm_gem_dmabuf_vunmap_local(struct dma_buf *dma_buf, struct dma_buf_map *map) +{ + struct drm_gem_object *obj = dma_buf->priv; + + drm_gem_vunmap_local(obj, map); +} +EXPORT_SYMBOL(drm_gem_dmabuf_vunmap_local); + /** * drm_gem_prime_mmap - PRIME mmap function for GEM drivers * @obj: GEM object @@ -787,6 +824,8 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { .mmap = drm_gem_dmabuf_mmap, .vmap = drm_gem_dmabuf_vmap, .vunmap = drm_gem_dmabuf_vunmap, + .vmap_local = drm_gem_dmabuf_vmap_local, + .vunmap_local = drm_gem_dmabuf_vunmap_local, };
/** diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c index 807a27a16365..fea11a53d8fc 100644 --- a/drivers/gpu/drm/virtio/virtgpu_prime.c +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c @@ -54,6 +54,8 @@ static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = { .mmap = drm_gem_dmabuf_mmap, .vmap = drm_gem_dmabuf_vmap, .vunmap = drm_gem_dmabuf_vunmap, + .vmap = drm_gem_dmabuf_vmap_local, + .vunmap = drm_gem_dmabuf_vunmap_local, }, .device_attach = drm_gem_map_attach, .get_uuid = virtgpu_virtio_get_uuid, diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index 5e6daa1c982f..1b4425dd1596 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -151,6 +151,27 @@ struct drm_gem_object_funcs { */ void (*vunmap)(struct drm_gem_object *obj, struct dma_buf_map *map);
+ /** + * @vmap_local: + * + * Returns a virtual address for the buffer. Used by the + * drm_gem_dmabuf_vmap_local() helper. Callers will hold &drm_gem_object.resv + * already and only release it after @vunmap_local has been called. + * + * This callback is optional. + */ + int (*vmap_local)(struct drm_gem_object *obj, struct dma_buf_map *map); + + /** + * @vunmap_local: + * + * Releases the address previously returned by @vmap. Used by the + * drm_gem_dmabuf_vunmap_local() helper. + * + * This callback is optional. + */ + void (*vunmap_local)(struct drm_gem_object *obj, struct dma_buf_map *map); + /** * @mmap: * diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h index 54f2c58305d2..fd2aef6966ef 100644 --- a/include/drm/drm_prime.h +++ b/include/drm/drm_prime.h @@ -85,6 +85,8 @@ void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, enum dma_data_direction dir); int drm_gem_dmabuf_vmap(struct dma_buf *dma_buf, struct dma_buf_map *map); void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, struct dma_buf_map *map); +int drm_gem_dmabuf_vmap_local(struct dma_buf *dma_buf, struct dma_buf_map *map); +void drm_gem_dmabuf_vunmap_local(struct dma_buf *dma_buf, struct dma_buf_map *map);
int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma); int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma);