| Message ID | 20200929151437.19717-5-tzimmermann@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Support GEM object mappings from I/O memory | expand |
On Tue, Sep 29, 2020 at 05:14:34PM +0200, Thomas Zimmermann wrote: > GEM's vmap and vunmap interfaces now wrap memory pointers in struct > dma_buf_map. > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > --- > drivers/gpu/drm/drm_client.c | 18 +++++++++++------- > drivers/gpu/drm/drm_gem.c | 28 ++++++++++++++-------------- > drivers/gpu/drm/drm_internal.h | 5 +++-- > drivers/gpu/drm/drm_prime.c | 14 ++++---------- > 4 files changed, 32 insertions(+), 33 deletions(-) > > diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c > index 495f47d23d87..ac0082bed966 100644 > --- a/drivers/gpu/drm/drm_client.c > +++ b/drivers/gpu/drm/drm_client.c > @@ -3,6 +3,7 @@ > * Copyright 2018 Noralf Trønnes > */ > > +#include <linux/dma-buf-map.h> > #include <linux/list.h> > #include <linux/module.h> > #include <linux/mutex.h> > @@ -304,7 +305,8 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u > */ > void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) > { > - void *vaddr; > + struct dma_buf_map map; > + int ret; > > if (buffer->vaddr) > return buffer->vaddr; > @@ -317,13 +319,13 @@ void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) > * fd_install step out of the driver backend hooks, to make that > * final step optional for internal users. > */ > - vaddr = drm_gem_vmap(buffer->gem); > - if (IS_ERR(vaddr)) > - return vaddr; > + ret = drm_gem_vmap(buffer->gem, &map); > + if (ret) > + return ERR_PTR(ret); > > - buffer->vaddr = vaddr; > + buffer->vaddr = map.vaddr; > > - return vaddr; > + return map.vaddr; > } > EXPORT_SYMBOL(drm_client_buffer_vmap); > > @@ -337,7 +339,9 @@ EXPORT_SYMBOL(drm_client_buffer_vmap); > */ > void drm_client_buffer_vunmap(struct drm_client_buffer *buffer) > { > - drm_gem_vunmap(buffer->gem, buffer->vaddr); > + struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(buffer->vaddr); > + > + drm_gem_vunmap(buffer->gem, &map); > buffer->vaddr = NULL; > } > EXPORT_SYMBOL(drm_client_buffer_vunmap); > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c > index 0c4a66dea5c2..f2b2f37d41c4 100644 > --- a/drivers/gpu/drm/drm_gem.c > +++ b/drivers/gpu/drm/drm_gem.c > @@ -1205,32 +1205,32 @@ void drm_gem_unpin(struct drm_gem_object *obj) > obj->funcs->unpin(obj); > } > > -void *drm_gem_vmap(struct drm_gem_object *obj) > +int drm_gem_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) > { > - struct dma_buf_map map; > int ret; > > - if (!obj->funcs->vmap) { > - return ERR_PTR(-EOPNOTSUPP); > + if (!obj->funcs->vmap) > + return -EOPNOTSUPP; > > - ret = obj->funcs->vmap(obj, &map); > + ret = obj->funcs->vmap(obj, map); > if (ret) > - return ERR_PTR(ret); > - else if (dma_buf_map_is_null(&map)) > - return ERR_PTR(-ENOMEM); > + return ret; > + else if (dma_buf_map_is_null(map)) > + return -ENOMEM; > > - return map.vaddr; > + return 0; > } > > -void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr) > +void drm_gem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) > { > - struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(vaddr); > - > - if (!vaddr) > + if (dma_buf_map_is_null(map)) > return; > > if (obj->funcs->vunmap) > - obj->funcs->vunmap(obj, &map); > + obj->funcs->vunmap(obj, map); > + > + /* Always set the mapping to NULL. Callers may rely on this. */ > + dma_buf_map_clear(map); > } > > /** > diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h > index b65865c630b0..58832d75a9bd 100644 > --- a/drivers/gpu/drm/drm_internal.h > +++ b/drivers/gpu/drm/drm_internal.h > @@ -33,6 +33,7 @@ > > struct dentry; > struct dma_buf; > +struct dma_buf_map; > struct drm_connector; > struct drm_crtc; > struct drm_framebuffer; > @@ -187,8 +188,8 @@ void drm_gem_print_info(struct drm_printer *p, unsigned int indent, > > int drm_gem_pin(struct drm_gem_object *obj); > void drm_gem_unpin(struct drm_gem_object *obj); > -void *drm_gem_vmap(struct drm_gem_object *obj); > -void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr); > +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); > > /* 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 89e2a2496734..cb8fbeeb731b 100644 > --- a/drivers/gpu/drm/drm_prime.c > +++ b/drivers/gpu/drm/drm_prime.c > @@ -667,21 +667,15 @@ EXPORT_SYMBOL(drm_gem_unmap_dma_buf); > * > * Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap > * callback. Calls into &drm_gem_object_funcs.vmap for device specific handling. > + * The kernel virtual address is returned in map. > * > - * Returns the kernel virtual address or NULL on failure. > + * Returns 0 on success or a negative errno code otherwise. > */ > int drm_gem_dmabuf_vmap(struct dma_buf *dma_buf, struct dma_buf_map *map) > { > struct drm_gem_object *obj = dma_buf->priv; > - void *vaddr; > > - vaddr = drm_gem_vmap(obj); > - if (IS_ERR(vaddr)) > - return PTR_ERR(vaddr); > - > - dma_buf_map_set_vaddr(map, vaddr); > - > - return 0; > + return drm_gem_vmap(obj, map); > } > EXPORT_SYMBOL(drm_gem_dmabuf_vmap); > > @@ -697,7 +691,7 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, struct dma_buf_map *map) > { > struct drm_gem_object *obj = dma_buf->priv; > > - drm_gem_vunmap(obj, map->vaddr); > + drm_gem_vunmap(obj, map); > } > EXPORT_SYMBOL(drm_gem_dmabuf_vunmap); Some of the transitional stuff disappearing! Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > -- > 2.28.0 >
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c index 495f47d23d87..ac0082bed966 100644 --- a/drivers/gpu/drm/drm_client.c +++ b/drivers/gpu/drm/drm_client.c @@ -3,6 +3,7 @@ * Copyright 2018 Noralf Trønnes */ +#include <linux/dma-buf-map.h> #include <linux/list.h> #include <linux/module.h> #include <linux/mutex.h> @@ -304,7 +305,8 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u */ void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) { - void *vaddr; + struct dma_buf_map map; + int ret; if (buffer->vaddr) return buffer->vaddr; @@ -317,13 +319,13 @@ void *drm_client_buffer_vmap(struct drm_client_buffer *buffer) * fd_install step out of the driver backend hooks, to make that * final step optional for internal users. */ - vaddr = drm_gem_vmap(buffer->gem); - if (IS_ERR(vaddr)) - return vaddr; + ret = drm_gem_vmap(buffer->gem, &map); + if (ret) + return ERR_PTR(ret); - buffer->vaddr = vaddr; + buffer->vaddr = map.vaddr; - return vaddr; + return map.vaddr; } EXPORT_SYMBOL(drm_client_buffer_vmap); @@ -337,7 +339,9 @@ EXPORT_SYMBOL(drm_client_buffer_vmap); */ void drm_client_buffer_vunmap(struct drm_client_buffer *buffer) { - drm_gem_vunmap(buffer->gem, buffer->vaddr); + struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(buffer->vaddr); + + drm_gem_vunmap(buffer->gem, &map); buffer->vaddr = NULL; } EXPORT_SYMBOL(drm_client_buffer_vunmap); diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 0c4a66dea5c2..f2b2f37d41c4 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -1205,32 +1205,32 @@ void drm_gem_unpin(struct drm_gem_object *obj) obj->funcs->unpin(obj); } -void *drm_gem_vmap(struct drm_gem_object *obj) +int drm_gem_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) { - struct dma_buf_map map; int ret; - if (!obj->funcs->vmap) { - return ERR_PTR(-EOPNOTSUPP); + if (!obj->funcs->vmap) + return -EOPNOTSUPP; - ret = obj->funcs->vmap(obj, &map); + ret = obj->funcs->vmap(obj, map); if (ret) - return ERR_PTR(ret); - else if (dma_buf_map_is_null(&map)) - return ERR_PTR(-ENOMEM); + return ret; + else if (dma_buf_map_is_null(map)) + return -ENOMEM; - return map.vaddr; + return 0; } -void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr) +void drm_gem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) { - struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(vaddr); - - if (!vaddr) + if (dma_buf_map_is_null(map)) return; if (obj->funcs->vunmap) - obj->funcs->vunmap(obj, &map); + obj->funcs->vunmap(obj, map); + + /* Always set the mapping to NULL. Callers may rely on this. */ + dma_buf_map_clear(map); } /** diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index b65865c630b0..58832d75a9bd 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -33,6 +33,7 @@ struct dentry; struct dma_buf; +struct dma_buf_map; struct drm_connector; struct drm_crtc; struct drm_framebuffer; @@ -187,8 +188,8 @@ void drm_gem_print_info(struct drm_printer *p, unsigned int indent, int drm_gem_pin(struct drm_gem_object *obj); void drm_gem_unpin(struct drm_gem_object *obj); -void *drm_gem_vmap(struct drm_gem_object *obj); -void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr); +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); /* 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 89e2a2496734..cb8fbeeb731b 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -667,21 +667,15 @@ EXPORT_SYMBOL(drm_gem_unmap_dma_buf); * * Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap * callback. Calls into &drm_gem_object_funcs.vmap for device specific handling. + * The kernel virtual address is returned in map. * - * Returns the kernel virtual address or NULL on failure. + * Returns 0 on success or a negative errno code otherwise. */ int drm_gem_dmabuf_vmap(struct dma_buf *dma_buf, struct dma_buf_map *map) { struct drm_gem_object *obj = dma_buf->priv; - void *vaddr; - vaddr = drm_gem_vmap(obj); - if (IS_ERR(vaddr)) - return PTR_ERR(vaddr); - - dma_buf_map_set_vaddr(map, vaddr); - - return 0; + return drm_gem_vmap(obj, map); } EXPORT_SYMBOL(drm_gem_dmabuf_vmap); @@ -697,7 +691,7 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, struct dma_buf_map *map) { struct drm_gem_object *obj = dma_buf->priv; - drm_gem_vunmap(obj, map->vaddr); + drm_gem_vunmap(obj, map); } EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
GEM's vmap and vunmap interfaces now wrap memory pointers in struct dma_buf_map. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> --- drivers/gpu/drm/drm_client.c | 18 +++++++++++------- drivers/gpu/drm/drm_gem.c | 28 ++++++++++++++-------------- drivers/gpu/drm/drm_internal.h | 5 +++-- drivers/gpu/drm/drm_prime.c | 14 ++++---------- 4 files changed, 32 insertions(+), 33 deletions(-)