Re: [PATCH v3 4/8] drm/gem: Create infrastructure for GEM vmap_local
On Wed, Dec 09, 2020 at 03:25:23PM +0100, Thomas Zimmermann wrote: > 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. > > Signed-off-by: Thomas Zimmermann > --- > 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 | 20 + > include/drm/drm_prime.h| 2 ++ > 6 files changed, 93 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 > _buf_ops.vmap_local > + * callback. Calls into _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 > + * _buf_ops.vunmap_local callback. Calls into > _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 > +++
[PATCH v3 4/8] drm/gem: Create infrastructure for GEM vmap_local
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. Signed-off-by: Thomas Zimmermann --- 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 | 20 + include/drm/drm_prime.h| 2 ++ 6 files changed, 93 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 _buf_ops.vmap_local + * callback. Calls into _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 + * _buf_ops.vunmap_local callback. Calls into _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, +