[mirror_ubuntu-zesty-kernel.git] / drivers / gpu / drm / radeon / radeon_gem.c

/*
 * Copyright 2008 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 * Copyright 2009 Jerome Glisse.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 *          Jerome Glisse
 */
#include "drmP.h"
#include "drm.h"
#include "radeon_drm.h"
#include "radeon.h"

int radeon_gem_object_init(struct drm_gem_object *obj)
{
	/* we do nothings here */
	return 0;
}

void radeon_gem_object_free(struct drm_gem_object *gobj)
{
	struct radeon_object *robj = gobj->driver_private;

	gobj->driver_private = NULL;
	if (robj) {
		radeon_object_unref(&robj);
	}
}

int radeon_gem_object_create(struct radeon_device *rdev, int size,
			     int alignment, int initial_domain,
			     bool discardable, bool kernel,
			     bool interruptible,
			     struct drm_gem_object **obj)
{
	struct drm_gem_object *gobj;
	struct radeon_object *robj;
	int r;

	*obj = NULL;
	gobj = drm_gem_object_alloc(rdev->ddev, size);
	if (!gobj) {
		return -ENOMEM;
	}
	/* At least align on page size */
	if (alignment < PAGE_SIZE) {
		alignment = PAGE_SIZE;
	}
	r = radeon_object_create(rdev, gobj, size, kernel, initial_domain,
				 interruptible, &robj);
	if (r) {
		DRM_ERROR("Failed to allocate GEM object (%d, %d, %u)\n",
			  size, initial_domain, alignment);
		mutex_lock(&rdev->ddev->struct_mutex);
		drm_gem_object_unreference(gobj);
		mutex_unlock(&rdev->ddev->struct_mutex);
		return r;
	}
	gobj->driver_private = robj;
	*obj = gobj;
	return 0;
}

int radeon_gem_object_pin(struct drm_gem_object *obj, uint32_t pin_domain,
			  uint64_t *gpu_addr)
{
	struct radeon_object *robj = obj->driver_private;
	uint32_t flags;

	switch (pin_domain) {
	case RADEON_GEM_DOMAIN_VRAM:
		flags = TTM_PL_FLAG_VRAM;
		break;
	case RADEON_GEM_DOMAIN_GTT:
		flags = TTM_PL_FLAG_TT;
		break;
	default:
		flags = TTM_PL_FLAG_SYSTEM;
		break;
	}
	return radeon_object_pin(robj, flags, gpu_addr);
}

void radeon_gem_object_unpin(struct drm_gem_object *obj)
{
	struct radeon_object *robj = obj->driver_private;
	radeon_object_unpin(robj);
}

int radeon_gem_set_domain(struct drm_gem_object *gobj,
			  uint32_t rdomain, uint32_t wdomain)
{
	struct radeon_object *robj;
	uint32_t domain;
	int r;

	/* FIXME: reeimplement */
	robj = gobj->driver_private;
	/* work out where to validate the buffer to */
	domain = wdomain;
	if (!domain) {
		domain = rdomain;
	}
	if (!domain) {
		/* Do nothings */
		printk(KERN_WARNING "Set domain withou domain !\n");
		return 0;
	}
	if (domain == RADEON_GEM_DOMAIN_CPU) {
		/* Asking for cpu access wait for object idle */
		r = radeon_object_wait(robj);
		if (r) {
			printk(KERN_ERR "Failed to wait for object !\n");
			return r;
		}
	}
	return 0;
}

int radeon_gem_init(struct radeon_device *rdev)
{
	INIT_LIST_HEAD(&rdev->gem.objects);
	return 0;
}

void radeon_gem_fini(struct radeon_device *rdev)
{
	radeon_object_force_delete(rdev);
}


/*
 * GEM ioctls.
 */
int radeon_gem_info_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *filp)
{
	struct radeon_device *rdev = dev->dev_private;
	struct drm_radeon_gem_info *args = data;

	args->vram_size = rdev->mc.real_vram_size;
	/* FIXME: report somethings that makes sense */
	args->vram_visible = rdev->mc.real_vram_size - (4 * 1024 * 1024);
	args->gart_size = rdev->mc.gtt_size;
	return 0;
}

int radeon_gem_pread_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *filp)
{
	/* TODO: implement */
	DRM_ERROR("unimplemented %s\n", __func__);
	return -ENOSYS;
}

int radeon_gem_pwrite_ioctl(struct drm_device *dev, void *data,
			    struct drm_file *filp)
{
	/* TODO: implement */
	DRM_ERROR("unimplemented %s\n", __func__);
	return -ENOSYS;
}

int radeon_gem_create_ioctl(struct drm_device *dev, void *data,
			    struct drm_file *filp)
{
	struct radeon_device *rdev = dev->dev_private;
	struct drm_radeon_gem_create *args = data;
	struct drm_gem_object *gobj;
	uint32_t handle;
	int r;

	/* create a gem object to contain this object in */
	args->size = roundup(args->size, PAGE_SIZE);
	r = radeon_gem_object_create(rdev, args->size, args->alignment,
				     args->initial_domain, false,
				     false, true, &gobj);
	if (r) {
		return r;
	}
	r = drm_gem_handle_create(filp, gobj, &handle);
	if (r) {
		mutex_lock(&dev->struct_mutex);
		drm_gem_object_unreference(gobj);
		mutex_unlock(&dev->struct_mutex);
		return r;
	}
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_handle_unreference(gobj);
	mutex_unlock(&dev->struct_mutex);
	args->handle = handle;
	return 0;
}

int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
				struct drm_file *filp)
{
	/* transition the BO to a domain -
	 * just validate the BO into a certain domain */
	struct drm_radeon_gem_set_domain *args = data;
	struct drm_gem_object *gobj;
	struct radeon_object *robj;
	int r;

	/* for now if someone requests domain CPU -
	 * just make sure the buffer is finished with */

	/* just do a BO wait for now */
	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	if (gobj == NULL) {
		return -EINVAL;
	}
	robj = gobj->driver_private;

	r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain);

	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(gobj);
	mutex_unlock(&dev->struct_mutex);
	return r;
}

int radeon_gem_mmap_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *filp)
{
	struct drm_radeon_gem_mmap *args = data;
	struct drm_gem_object *gobj;
	struct radeon_object *robj;
	int r;

	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	if (gobj == NULL) {
		return -EINVAL;
	}
	robj = gobj->driver_private;
	r = radeon_object_mmap(robj, &args->addr_ptr);
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(gobj);
	mutex_unlock(&dev->struct_mutex);
	return r;
}

int radeon_gem_busy_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *filp)
{
	struct drm_radeon_gem_busy *args = data;
	struct drm_gem_object *gobj;
	struct radeon_object *robj;
	int r;
	uint32_t cur_placement;

	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	if (gobj == NULL) {
		return -EINVAL;
	}
	robj = gobj->driver_private;
	r = radeon_object_busy_domain(robj, &cur_placement);
	switch (cur_placement) {
	case TTM_PL_VRAM:
		args->domain = RADEON_GEM_DOMAIN_VRAM;
		break;
	case TTM_PL_TT:
		args->domain = RADEON_GEM_DOMAIN_GTT;
		break;
	case TTM_PL_SYSTEM:
		args->domain = RADEON_GEM_DOMAIN_CPU;
	default:
		break;
	}
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(gobj);
	mutex_unlock(&dev->struct_mutex);
	return r;
}

int radeon_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
			      struct drm_file *filp)
{
	struct drm_radeon_gem_wait_idle *args = data;
	struct drm_gem_object *gobj;
	struct radeon_object *robj;
	int r;

	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	if (gobj == NULL) {
		return -EINVAL;
	}
	robj = gobj->driver_private;
	r = radeon_object_wait(robj);
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(gobj);
	mutex_unlock(&dev->struct_mutex);
	return r;
}

int radeon_gem_set_tiling_ioctl(struct drm_device *dev, void *data,
				struct drm_file *filp)
{
	struct drm_radeon_gem_set_tiling *args = data;
	struct drm_gem_object *gobj;
	struct radeon_object *robj;
	int r = 0;

	DRM_DEBUG("%d \n", args->handle);
	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	if (gobj == NULL)
		return -EINVAL;
	robj = gobj->driver_private;
	radeon_object_set_tiling_flags(robj, args->tiling_flags, args->pitch);
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(gobj);
	mutex_unlock(&dev->struct_mutex);
	return r;
}

int radeon_gem_get_tiling_ioctl(struct drm_device *dev, void *data,
				struct drm_file *filp)
{
	struct drm_radeon_gem_get_tiling *args = data;
	struct drm_gem_object *gobj;
	struct radeon_object *robj;
	int r = 0;

	DRM_DEBUG("\n");
	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	if (gobj == NULL)
		return -EINVAL;
	robj = gobj->driver_private;
	radeon_object_get_tiling_flags(robj, &args->tiling_flags,
				       &args->pitch);
	mutex_lock(&dev->struct_mutex);
	drm_gem_object_unreference(gobj);
	mutex_unlock(&dev->struct_mutex);
	return r;
}
Commit	Line	Data
771fe6b9 JG	1	/*
	2	* Copyright 2008 Advanced Micro Devices, Inc.
	3	* Copyright 2008 Red Hat Inc.
	4	* Copyright 2009 Jerome Glisse.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the "Software"),
	8	* to deal in the Software without restriction, including without limitation
	9	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	10	* and/or sell copies of the Software, and to permit persons to whom the
	11	* Software is furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	20	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	21	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	22	* OTHER DEALINGS IN THE SOFTWARE.
	23	*
	24	* Authors: Dave Airlie
	25	* Alex Deucher
	26	* Jerome Glisse
	27	*/
	28	#include "drmP.h"
	29	#include "drm.h"
	30	#include "radeon_drm.h"
	31	#include "radeon.h"
	32
	33	int radeon_gem_object_init(struct drm_gem_object *obj)
	34	{
	35	/* we do nothings here */
	36	return 0;
	37	}
	38
	39	void radeon_gem_object_free(struct drm_gem_object *gobj)
	40	{
	41	struct radeon_object *robj = gobj->driver_private;
	42
	43	gobj->driver_private = NULL;
	44	if (robj) {
	45	radeon_object_unref(&robj);
	46	}
	47	}
	48
	49	int radeon_gem_object_create(struct radeon_device *rdev, int size,
	50	int alignment, int initial_domain,
	51	bool discardable, bool kernel,
	52	bool interruptible,
	53	struct drm_gem_object **obj)
	54	{
	55	struct drm_gem_object *gobj;
	56	struct radeon_object *robj;
	57	int r;
	58
	59	*obj = NULL;
	60	gobj = drm_gem_object_alloc(rdev->ddev, size);
	61	if (!gobj) {
	62	return -ENOMEM;
	63	}
	64	/* At least align on page size */
65	if (alignment < PAGE_SIZE) {
66	alignment = PAGE_SIZE;
67	}
68	r = radeon_object_create(rdev, gobj, size, kernel, initial_domain,
69	interruptible, &robj);
70	if (r) {
71	DRM_ERROR("Failed to allocate GEM object (%d, %d, %u)\n",
72	size, initial_domain, alignment);
73	mutex_lock(&rdev->ddev->struct_mutex);
74	drm_gem_object_unreference(gobj);
75	mutex_unlock(&rdev->ddev->struct_mutex);
76	return r;
77	}
78	gobj->driver_private = robj;
79	*obj = gobj;
80	return 0;
81	}
82
83	int radeon_gem_object_pin(struct drm_gem_object *obj, uint32_t pin_domain,
84	uint64_t *gpu_addr)
85	{
86	struct radeon_object *robj = obj->driver_private;
87	uint32_t flags;
88
89	switch (pin_domain) {
90	case RADEON_GEM_DOMAIN_VRAM:
91	flags = TTM_PL_FLAG_VRAM;
92	break;
93	case RADEON_GEM_DOMAIN_GTT:
94	flags = TTM_PL_FLAG_TT;
95	break;
96	default:
97	flags = TTM_PL_FLAG_SYSTEM;
98	break;
99	}
100	return radeon_object_pin(robj, flags, gpu_addr);
101	}
102
103	void radeon_gem_object_unpin(struct drm_gem_object *obj)
104	{
105	struct radeon_object *robj = obj->driver_private;
106	radeon_object_unpin(robj);
107	}
108
109	int radeon_gem_set_domain(struct drm_gem_object *gobj,
110	uint32_t rdomain, uint32_t wdomain)
111	{
112	struct radeon_object *robj;
113	uint32_t domain;
114	int r;
115
116	/* FIXME: reeimplement */
117	robj = gobj->driver_private;
118	/* work out where to validate the buffer to */
119	domain = wdomain;
120	if (!domain) {
121	domain = rdomain;
122	}
123	if (!domain) {
124	/* Do nothings */
125	printk(KERN_WARNING "Set domain withou domain !\n");
126	return 0;
127	}
128	if (domain == RADEON_GEM_DOMAIN_CPU) {
129	/* Asking for cpu access wait for object idle */
130	r = radeon_object_wait(robj);
131	if (r) {
132	printk(KERN_ERR "Failed to wait for object !\n");
133	return r;
134	}
135	}
136	return 0;
137	}
138
139	int radeon_gem_init(struct radeon_device *rdev)
140	{
141	INIT_LIST_HEAD(&rdev->gem.objects);
142	return 0;
143	}
144
145	void radeon_gem_fini(struct radeon_device *rdev)
146	{
147	radeon_object_force_delete(rdev);
148	}
149
150
151	/*
152	* GEM ioctls.
153	*/
154	int radeon_gem_info_ioctl(struct drm_device dev, void data,
155	struct drm_file *filp)
156	{
157	struct radeon_device *rdev = dev->dev_private;
158	struct drm_radeon_gem_info *args = data;
159
7a50f01a	160	args->vram_size = rdev->mc.real_vram_size;
771fe6b9	161	/* FIXME: report somethings that makes sense */
7a50f01a	162	args->vram_visible = rdev->mc.real_vram_size - (4 * 1024 * 1024);
771fe6b9 JG	163	args->gart_size = rdev->mc.gtt_size;
	164	return 0;
	165	}
	166
	167	int radeon_gem_pread_ioctl(struct drm_device dev, void data,
	168	struct drm_file *filp)
	169	{
	170	/* TODO: implement */
	171	DRM_ERROR("unimplemented %s\n", __func__);
	172	return -ENOSYS;
	173	}
	174
	175	int radeon_gem_pwrite_ioctl(struct drm_device dev, void data,
	176	struct drm_file *filp)
	177	{
	178	/* TODO: implement */
	179	DRM_ERROR("unimplemented %s\n", __func__);
	180	return -ENOSYS;
	181	}
	182
	183	int radeon_gem_create_ioctl(struct drm_device dev, void data,
	184	struct drm_file *filp)
	185	{
	186	struct radeon_device *rdev = dev->dev_private;
	187	struct drm_radeon_gem_create *args = data;
	188	struct drm_gem_object *gobj;
	189	uint32_t handle;
	190	int r;
	191
	192	/* create a gem object to contain this object in */
	193	args->size = roundup(args->size, PAGE_SIZE);
	194	r = radeon_gem_object_create(rdev, args->size, args->alignment,
	195	args->initial_domain, false,
	196	false, true, &gobj);
	197	if (r) {
	198	return r;
	199	}
	200	r = drm_gem_handle_create(filp, gobj, &handle);
	201	if (r) {
	202	mutex_lock(&dev->struct_mutex);
	203	drm_gem_object_unreference(gobj);
	204	mutex_unlock(&dev->struct_mutex);
	205	return r;
	206	}
	207	mutex_lock(&dev->struct_mutex);
	208	drm_gem_object_handle_unreference(gobj);
	209	mutex_unlock(&dev->struct_mutex);
	210	args->handle = handle;
	211	return 0;
	212	}
	213
	214	int radeon_gem_set_domain_ioctl(struct drm_device dev, void data,
	215	struct drm_file *filp)
	216	{
	217	/* transition the BO to a domain -
	218	* just validate the BO into a certain domain */
	219	struct drm_radeon_gem_set_domain *args = data;
	220	struct drm_gem_object *gobj;
	221	struct radeon_object *robj;
	222	int r;
	223
	224	/* for now if someone requests domain CPU -
	225	* just make sure the buffer is finished with */
	226
227	/* just do a BO wait for now */
228	gobj = drm_gem_object_lookup(dev, filp, args->handle);
229	if (gobj == NULL) {
230	return -EINVAL;
231	}
232	robj = gobj->driver_private;
233
234	r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain);
235
236	mutex_lock(&dev->struct_mutex);
237	drm_gem_object_unreference(gobj);
238	mutex_unlock(&dev->struct_mutex);
239	return r;
240	}
241
242	int radeon_gem_mmap_ioctl(struct drm_device dev, void data,
243	struct drm_file *filp)
244	{
245	struct drm_radeon_gem_mmap *args = data;
246	struct drm_gem_object *gobj;
247	struct radeon_object *robj;
248	int r;
249
250	gobj = drm_gem_object_lookup(dev, filp, args->handle);
251	if (gobj == NULL) {
252	return -EINVAL;
253	}
254	robj = gobj->driver_private;
255	r = radeon_object_mmap(robj, &args->addr_ptr);
256	mutex_lock(&dev->struct_mutex);
257	drm_gem_object_unreference(gobj);
258	mutex_unlock(&dev->struct_mutex);
259	return r;
260	}
261
262	int radeon_gem_busy_ioctl(struct drm_device dev, void data,
263	struct drm_file *filp)
264	{
cefb87ef DA	265	struct drm_radeon_gem_busy *args = data;
	266	struct drm_gem_object *gobj;
	267	struct radeon_object *robj;
	268	int r;
	269	uint32_t cur_placement;
	270
	271	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	272	if (gobj == NULL) {
	273	return -EINVAL;
	274	}
	275	robj = gobj->driver_private;
	276	r = radeon_object_busy_domain(robj, &cur_placement);
9f844e51 MD	277	switch (cur_placement) {
9f844e51 MD	278	case TTM_PL_VRAM:
cefb87ef	279	args->domain = RADEON_GEM_DOMAIN_VRAM;
9f844e51 MD	280	break;
9f844e51 MD	281	case TTM_PL_TT:
cefb87ef	282	args->domain = RADEON_GEM_DOMAIN_GTT;
9f844e51 MD	283	break;
9f844e51 MD	284	case TTM_PL_SYSTEM:
cefb87ef	285	args->domain = RADEON_GEM_DOMAIN_CPU;
9f844e51 MD	286	default:
	287	break;
	288	}
cefb87ef DA	289	mutex_lock(&dev->struct_mutex);
	290	drm_gem_object_unreference(gobj);
	291	mutex_unlock(&dev->struct_mutex);
e3b2415e	292	return r;
771fe6b9 JG	293	}
	294
	295	int radeon_gem_wait_idle_ioctl(struct drm_device dev, void data,
	296	struct drm_file *filp)
	297	{
	298	struct drm_radeon_gem_wait_idle *args = data;
	299	struct drm_gem_object *gobj;
	300	struct radeon_object *robj;
	301	int r;
	302
	303	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	304	if (gobj == NULL) {
	305	return -EINVAL;
	306	}
	307	robj = gobj->driver_private;
	308	r = radeon_object_wait(robj);
	309	mutex_lock(&dev->struct_mutex);
	310	drm_gem_object_unreference(gobj);
	311	mutex_unlock(&dev->struct_mutex);
	312	return r;
	313	}
e024e110 DA	314
	315	int radeon_gem_set_tiling_ioctl(struct drm_device dev, void data,
	316	struct drm_file *filp)
	317	{
	318	struct drm_radeon_gem_set_tiling *args = data;
	319	struct drm_gem_object *gobj;
	320	struct radeon_object *robj;
	321	int r = 0;
	322
	323	DRM_DEBUG("%d \n", args->handle);
	324	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	325	if (gobj == NULL)
	326	return -EINVAL;
	327	robj = gobj->driver_private;
	328	radeon_object_set_tiling_flags(robj, args->tiling_flags, args->pitch);
	329	mutex_lock(&dev->struct_mutex);
	330	drm_gem_object_unreference(gobj);
	331	mutex_unlock(&dev->struct_mutex);
	332	return r;
	333	}
	334
	335	int radeon_gem_get_tiling_ioctl(struct drm_device dev, void data,
	336	struct drm_file *filp)
	337	{
	338	struct drm_radeon_gem_get_tiling *args = data;
	339	struct drm_gem_object *gobj;
	340	struct radeon_object *robj;
	341	int r = 0;
	342
	343	DRM_DEBUG("\n");
	344	gobj = drm_gem_object_lookup(dev, filp, args->handle);
	345	if (gobj == NULL)
	346	return -EINVAL;
	347	robj = gobj->driver_private;
	348	radeon_object_get_tiling_flags(robj, &args->tiling_flags,
	349	&args->pitch);
	350	mutex_lock(&dev->struct_mutex);
	351	drm_gem_object_unreference(gobj);
	352	mutex_unlock(&dev->struct_mutex);
	353	return r;
	354	}