Implement DRI3/prime support. This allows graphics buffers to be passed

between processes using file descriptors.  This provides an alternative to
eporting them with guesable 32-bit IDs.  This implementation does not (yet)
allow sharing of graphics buffers between GPUs.

ok mpi@, visa@

1 files changed, 4 insertions, 5 deletions

diff --git a/sys/dev/pci/drm/drm_gem.c b/sys/dev/pci/drm/drm_gem.c
index ecf81f371e3..125b78f885a 100644
--- a/sys/dev/pci/drm/drm_gem.c
+++ b/sys/dev/pci/drm/drm_gem.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: drm_gem.c,v 1.5 2017/09/03 13:28:54 jsg Exp $	*/
+/*	$OpenBSD: drm_gem.c,v 1.6 2018/06/25 22:29:16 kettenis Exp $	*/
 /*
  * Copyright © 2008 Intel Corporation
  *
@@ -28,6 +28,7 @@
 
 #include <dev/pci/drm/drmP.h>
 #include <dev/pci/drm/drm_vma_manager.h>
+#include "drm_internal.h"
 
 #include <uvm/uvm.h>
 
@@ -318,7 +319,6 @@ EXPORT_SYMBOL(drm_gem_private_object_init);
 static void
 drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp)
 {
-#ifdef __linux__
 	/*
 	 * Note: obj->dma_buf can't disappear as long as we still hold a
 	 * handle reference in obj->handle_count.
@@ -329,7 +329,6 @@ drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp)
 						   obj->dma_buf);
 	}
 	mutex_unlock(&filp->prime.lock);
-#endif
 }
 
 /**
@@ -352,13 +351,11 @@ static void drm_gem_object_handle_free(struct drm_gem_object *obj)
 
 static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj)
 {
-#ifdef __linux__
 	/* Unbreak the reference cycle if we have an exported dma_buf. */
 	if (obj->dma_buf) {
 		dma_buf_put(obj->dma_buf);
 		obj->dma_buf = NULL;
 	}
-#endif
 }
 
 static void
@@ -873,6 +870,8 @@ drm_gem_object_release(struct drm_gem_object *obj)
 {
 	struct drm_device *dev = obj->dev;
 
+	WARN_ON(obj->dma_buf);
+
 	if (obj->uao)
 		uao_detach(obj->uao);