Allow drivers with blob limitations to run checks before blobs are created. This can be used to limit how much memory can be allocated based on driver requirements.
Signed-off-by: Steve Cohen cohens@codeaurora.org --- drivers/gpu/drm/drm_property.c | 7 +++++++ include/drm/drm_drv.h | 9 +++++++++ 2 files changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c index 892ce63..507a8a1 100644 --- a/drivers/gpu/drm/drm_property.c +++ b/drivers/gpu/drm/drm_property.c @@ -793,6 +793,13 @@ int drm_mode_createblob_ioctl(struct drm_device *dev, if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EOPNOTSUPP;
+ if (dev->driver->createblob_check) { + ret = dev->driver->createblob_check( + dev, out_resp->length, file_priv); + if (ret) + return ret; + } + blob = drm_property_create_blob(dev, out_resp->length, NULL); if (IS_ERR(blob)) return PTR_ERR(blob); diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h index 8976afe..73b39b89 100644 --- a/include/drm/drm_drv.h +++ b/include/drm/drm_drv.h @@ -776,6 +776,15 @@ struct drm_driver { int (*dma_quiescent) (struct drm_device *); int (*context_dtor) (struct drm_device *dev, int context); int dev_priv_size; + + /** + * @createblob_check: driver check for creating blob properties + * + * Hook for checking blob limitations imposed by drivers + */ + int (*createblob_check) (struct drm_device *dev, + size_t length, + struct drm_file *file_priv); };
extern unsigned int drm_debug;