From: Asahi Lina <lina@xxxxxxxxxxxxx>
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 <lina@xxxxxxxxxxxxx>
Signed-off-by: Daniel Almeida <daniel.almeida@xxxxxxxxxxxxx>
---
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 ee811764c3df4b4e9c377a66afd4967512ba2001..8f998fe6beecd285ce3e2d5badfa95eb7d7bd548 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -195,6 +195,7 @@ 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 32a8781cfd67b82ece7b7b94625715171bb41917..20aa350280abe9a6ed6742e131ff50c65bc9dfa9 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 fdae947682cd0b7b06db5e35e120f049a0f30179..f700e4996eccb92597cca6b8c3df8e35b864c1e1 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -432,6 +432,14 @@ 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;
};
/**
--
2.48.1
