From 0d2ab4b0729983c5cd17eb3e6bf7601f17a136d9 Mon Sep 17 00:00:00 2001 From: Asahi Lina Date: Fri, 10 Feb 2023 15:31:42 +0900 Subject: [PATCH] drm/gem: Add a flag to control whether objects can be exported Drivers may want to support driver-private objects, which cannot be shared. This allows them to share a single lock and enables other optimizations. Add an `exportable` field to drm_gem_object, which blocks PRIME export if set to false. It is initialized to true in drm_gem_private_object_init. Signed-off-by: Asahi Lina --- drivers/gpu/drm/drm_gem.c | 1 + drivers/gpu/drm/drm_prime.c | 5 +++++ include/drm/drm_gem.h | 8 ++++++++ 3 files changed, 14 insertions(+) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 149b8e25da5bbf..ce855424f1b589 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -169,6 +169,7 @@ void drm_gem_private_object_init(struct drm_device *dev, drm_vma_node_reset(&obj->vma_node); INIT_LIST_HEAD(&obj->lru_node); + obj->exportable = true; } EXPORT_SYMBOL(drm_gem_private_object_init); diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 0e3f8adf162f67..eafd35b63c62a9 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -387,6 +387,11 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev, return dmabuf; } + if (!obj->exportable) { + dmabuf = ERR_PTR(-EINVAL); + return dmabuf; + } + if (obj->funcs && obj->funcs->export) dmabuf = obj->funcs->export(obj, flags); else diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index d8b86df2ec0dab..0c34d891001c9d 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -430,6 +430,14 @@ struct drm_gem_object { * The current LRU list that the GEM object is on. */ struct drm_gem_lru *lru; + + /** + * @exportable: + * + * Whether this GEM object can be exported via the drm_gem_object_funcs->export + * callback. Defaults to true. + */ + bool exportable; }; /**