[linux-2.6-block.git] / drivers / gpu / drm / drm_gem_cma_helper.c

/*
 * drm gem CMA (contiguous memory allocator) helper functions
 *
 * Copyright (C) 2012 Sascha Hauer, Pengutronix
 *
 * Based on Samsung Exynos code
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>

#include <drm/drmP.h>
#include <drm/drm.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_vma_manager.h>

/*
 * __drm_gem_cma_create - Create a GEM CMA object without allocating memory
 * @drm: The drm device
 * @size: The GEM object size
 *
 * This function creates and initializes a GEM CMA object of the given size, but
 * doesn't allocate any memory to back the object.
 *
 * Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure.
 */
static struct drm_gem_cma_object *
__drm_gem_cma_create(struct drm_device *drm, unsigned int size)
{
	struct drm_gem_cma_object *cma_obj;
	struct drm_gem_object *gem_obj;
	int ret;

	cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
	if (!cma_obj)
		return ERR_PTR(-ENOMEM);

	gem_obj = &cma_obj->base;

	ret = drm_gem_object_init(drm, gem_obj, size);
	if (ret)
		goto error;

	ret = drm_gem_create_mmap_offset(gem_obj);
	if (ret) {
		drm_gem_object_release(gem_obj);
		goto error;
	}

	return cma_obj;

error:
	kfree(cma_obj);
	return ERR_PTR(ret);
}

/*
 * drm_gem_cma_create - allocate an object with the given size
 *
 * returns a struct drm_gem_cma_object* on success or ERR_PTR values
 * on failure.
 */
struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
		unsigned int size)
{
	struct drm_gem_cma_object *cma_obj;
	int ret;

	size = round_up(size, PAGE_SIZE);

	cma_obj = __drm_gem_cma_create(drm, size);
	if (IS_ERR(cma_obj))
		return cma_obj;

	cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
			&cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN);
	if (!cma_obj->vaddr) {
		dev_err(drm->dev, "failed to allocate buffer with size %d\n",
			size);
		ret = -ENOMEM;
		goto error;
	}

	return cma_obj;

error:
	drm_gem_cma_free_object(&cma_obj->base);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_create);

/*
 * drm_gem_cma_create_with_handle - allocate an object with the given
 * size and create a gem handle on it
 *
 * returns a struct drm_gem_cma_object* on success or ERR_PTR values
 * on failure.
 */
static struct drm_gem_cma_object *drm_gem_cma_create_with_handle(
		struct drm_file *file_priv,
		struct drm_device *drm, unsigned int size,
		unsigned int *handle)
{
	struct drm_gem_cma_object *cma_obj;
	struct drm_gem_object *gem_obj;
	int ret;

	cma_obj = drm_gem_cma_create(drm, size);
	if (IS_ERR(cma_obj))
		return cma_obj;

	gem_obj = &cma_obj->base;

	/*
	 * allocate a id of idr table where the obj is registered
	 * and handle has the id what user can see.
	 */
	ret = drm_gem_handle_create(file_priv, gem_obj, handle);
	if (ret)
		goto err_handle_create;

	/* drop reference from allocate - handle holds it now. */
	drm_gem_object_unreference_unlocked(gem_obj);

	return cma_obj;

err_handle_create:
	drm_gem_cma_free_object(gem_obj);

	return ERR_PTR(ret);
}

/*
 * drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback
 * function
 */
void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
{
	struct drm_gem_cma_object *cma_obj;

	drm_gem_free_mmap_offset(gem_obj);

	cma_obj = to_drm_gem_cma_obj(gem_obj);

	if (cma_obj->vaddr) {
		dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
				      cma_obj->vaddr, cma_obj->paddr);
	} else if (gem_obj->import_attach) {
		drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
	}

	drm_gem_object_release(gem_obj);

	kfree(cma_obj);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_free_object);

/*
 * drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback
 * function
 *
 * This aligns the pitch and size arguments to the minimum required. wrap
 * this into your own function if you need bigger alignment.
 */
int drm_gem_cma_dumb_create(struct drm_file *file_priv,
		struct drm_device *dev, struct drm_mode_create_dumb *args)
{
	struct drm_gem_cma_object *cma_obj;
	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);

	if (args->pitch < min_pitch)
		args->pitch = min_pitch;

	if (args->size < args->pitch * args->height)
		args->size = args->pitch * args->height;

	cma_obj = drm_gem_cma_create_with_handle(file_priv, dev,
			args->size, &args->handle);
	return PTR_ERR_OR_ZERO(cma_obj);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);

/*
 * drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback
 * function
 */
int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
		struct drm_device *drm, uint32_t handle, uint64_t *offset)
{
	struct drm_gem_object *gem_obj;

	mutex_lock(&drm->struct_mutex);

	gem_obj = drm_gem_object_lookup(drm, file_priv, handle);
	if (!gem_obj) {
		dev_err(drm->dev, "failed to lookup gem object\n");
		mutex_unlock(&drm->struct_mutex);
		return -EINVAL;
	}

	*offset = drm_vma_node_offset_addr(&gem_obj->vma_node);

	drm_gem_object_unreference(gem_obj);

	mutex_unlock(&drm->struct_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset);

const struct vm_operations_struct drm_gem_cma_vm_ops = {
	.open = drm_gem_vm_open,
	.close = drm_gem_vm_close,
};
EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops);

static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
				struct vm_area_struct *vma)
{
	int ret;

	ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT,
			vma->vm_end - vma->vm_start, vma->vm_page_prot);
	if (ret)
		drm_gem_vm_close(vma);

	return ret;
}

/*
 * drm_gem_cma_mmap - (struct file_operation)->mmap callback function
 */
int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_gem_cma_object *cma_obj;
	struct drm_gem_object *gem_obj;
	int ret;

	ret = drm_gem_mmap(filp, vma);
	if (ret)
		return ret;

	gem_obj = vma->vm_private_data;
	cma_obj = to_drm_gem_cma_obj(gem_obj);

	return drm_gem_cma_mmap_obj(cma_obj, vma);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);

#ifdef CONFIG_DEBUG_FS
void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m)
{
	struct drm_gem_object *obj = &cma_obj->base;
	struct drm_device *dev = obj->dev;
	uint64_t off;

	WARN_ON(!mutex_is_locked(&dev->struct_mutex));

	off = drm_vma_node_start(&obj->vma_node);

	seq_printf(m, "%2d (%2d) %08llx %08Zx %p %d",
			obj->name, obj->refcount.refcount.counter,
			off, cma_obj->paddr, cma_obj->vaddr, obj->size);

	seq_printf(m, "\n");
}
EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
#endif

/* low-level interface prime helpers */
struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
{
	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
	struct sg_table *sgt;
	int ret;

	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
	if (!sgt)
		return NULL;

	ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
			      cma_obj->paddr, obj->size);
	if (ret < 0)
		goto out;

	return sgt;

out:
	kfree(sgt);
	return NULL;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);

struct drm_gem_object *
drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
				  struct sg_table *sgt)
{
	struct drm_gem_cma_object *cma_obj;

	if (sgt->nents != 1)
		return ERR_PTR(-EINVAL);

	/* Create a CMA GEM buffer. */
	cma_obj = __drm_gem_cma_create(dev, size);
	if (IS_ERR(cma_obj))
		return ERR_PTR(PTR_ERR(cma_obj));

	cma_obj->paddr = sg_dma_address(sgt->sgl);
	cma_obj->sgt = sgt;

	DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr, size);

	return &cma_obj->base;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);

int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
			   struct vm_area_struct *vma)
{
	struct drm_gem_cma_object *cma_obj;
	struct drm_device *dev = obj->dev;
	int ret;

	mutex_lock(&dev->struct_mutex);
	ret = drm_gem_mmap_obj(obj, obj->size, vma);
	mutex_unlock(&dev->struct_mutex);
	if (ret < 0)
		return ret;

	cma_obj = to_drm_gem_cma_obj(obj);
	return drm_gem_cma_mmap_obj(cma_obj, vma);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);

void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
{
	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);

	return cma_obj->vaddr;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);

void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
	/* Nothing to do */
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);
Commit	Line	Data
b9d47450 SH	1	/*
	2	* drm gem CMA (contiguous memory allocator) helper functions
	3	*
	4	* Copyright (C) 2012 Sascha Hauer, Pengutronix
	5	*
	6	* Based on Samsung Exynos code
	7	*
	8	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version 2
	13	* of the License, or (at your option) any later version.
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*/
	19
	20	#include <linux/mm.h>
	21	#include <linux/slab.h>
	22	#include <linux/mutex.h>
	23	#include <linux/export.h>
71d7282a	24	#include <linux/dma-buf.h>
b9d47450 SH	25	#include <linux/dma-mapping.h>
	26
	27	#include <drm/drmP.h>
	28	#include <drm/drm.h>
	29	#include <drm/drm_gem_cma_helper.h>
0de23977	30	#include <drm/drm_vma_manager.h>
b9d47450	31
b9d47450	32	/*
a5ed8940 LP	33	* __drm_gem_cma_create - Create a GEM CMA object without allocating memory
	34	* @drm: The drm device
	35	* @size: The GEM object size
b9d47450	36	*
a5ed8940 LP	37	* This function creates and initializes a GEM CMA object of the given size, but
	38	* doesn't allocate any memory to back the object.
	39	*
	40	* Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure.
b9d47450	41	*/
a5ed8940 LP	42	static struct drm_gem_cma_object *
a5ed8940 LP	43	__drm_gem_cma_create(struct drm_device *drm, unsigned int size)
b9d47450 SH	44	{
	45	struct drm_gem_cma_object *cma_obj;
	46	struct drm_gem_object *gem_obj;
	47	int ret;
	48
b9d47450 SH	49	cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
	50	if (!cma_obj)
	51	return ERR_PTR(-ENOMEM);
	52
b9d47450 SH	53	gem_obj = &cma_obj->base;
	54
	55	ret = drm_gem_object_init(drm, gem_obj, size);
	56	if (ret)
a5ed8940	57	goto error;
b9d47450 SH	58
b9d47450 SH	59	ret = drm_gem_create_mmap_offset(gem_obj);
a5ed8940 LP	60	if (ret) {
	61	drm_gem_object_release(gem_obj);
	62	goto error;
	63	}
b9d47450 SH	64
	65	return cma_obj;
	66
a5ed8940 LP	67	error:
	68	kfree(cma_obj);
	69	return ERR_PTR(ret);
	70	}
b9d47450	71
a5ed8940 LP	72	/*
	73	* drm_gem_cma_create - allocate an object with the given size
	74	*
	75	* returns a struct drm_gem_cma_object* on success or ERR_PTR values
	76	* on failure.
	77	*/
	78	struct drm_gem_cma_object drm_gem_cma_create(struct drm_device drm,
	79	unsigned int size)
	80	{
	81	struct drm_gem_cma_object *cma_obj;
71d7282a	82	int ret;
b9d47450	83
a5ed8940	84	size = round_up(size, PAGE_SIZE);
b9d47450	85
a5ed8940 LP	86	cma_obj = __drm_gem_cma_create(drm, size);
	87	if (IS_ERR(cma_obj))
	88	return cma_obj;
	89
	90	cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
	91	&cma_obj->paddr, GFP_KERNEL \| __GFP_NOWARN);
	92	if (!cma_obj->vaddr) {
	93	dev_err(drm->dev, "failed to allocate buffer with size %d\n",
	94	size);
71d7282a LP	95	ret = -ENOMEM;
	96	goto error;
	97	}
	98
a5ed8940	99	return cma_obj;
71d7282a LP	100
71d7282a LP	101	error:
71d7282a LP	102	drm_gem_cma_free_object(&cma_obj->base);
71d7282a LP	103	return ERR_PTR(ret);
b9d47450 SH	104	}
	105	EXPORT_SYMBOL_GPL(drm_gem_cma_create);
	106
	107	/*
	108	* drm_gem_cma_create_with_handle - allocate an object with the given
	109	* size and create a gem handle on it
	110	*
	111	* returns a struct drm_gem_cma_object* on success or ERR_PTR values
	112	* on failure.
	113	*/
	114	static struct drm_gem_cma_object *drm_gem_cma_create_with_handle(
	115	struct drm_file *file_priv,
	116	struct drm_device *drm, unsigned int size,
	117	unsigned int *handle)
	118	{
	119	struct drm_gem_cma_object *cma_obj;
	120	struct drm_gem_object *gem_obj;
	121	int ret;
	122
	123	cma_obj = drm_gem_cma_create(drm, size);
	124	if (IS_ERR(cma_obj))
	125	return cma_obj;
	126
	127	gem_obj = &cma_obj->base;
	128
	129	/*
	130	* allocate a id of idr table where the obj is registered
	131	* and handle has the id what user can see.
	132	*/
	133	ret = drm_gem_handle_create(file_priv, gem_obj, handle);
	134	if (ret)
	135	goto err_handle_create;
	136
	137	/* drop reference from allocate - handle holds it now. */
	138	drm_gem_object_unreference_unlocked(gem_obj);
	139
	140	return cma_obj;
	141
	142	err_handle_create:
	143	drm_gem_cma_free_object(gem_obj);
	144
	145	return ERR_PTR(ret);
	146	}
	147
	148	/*
	149	* drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback
	150	* function
	151	*/
	152	void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
	153	{
	154	struct drm_gem_cma_object *cma_obj;
	155
0de23977	156	drm_gem_free_mmap_offset(gem_obj);
b9d47450	157
b9d47450 SH	158	cma_obj = to_drm_gem_cma_obj(gem_obj);
b9d47450 SH	159
71d7282a	160	if (cma_obj->vaddr) {
a5ed8940 LP	161	dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
a5ed8940 LP	162	cma_obj->vaddr, cma_obj->paddr);
71d7282a LP	163	} else if (gem_obj->import_attach) {
	164	drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
	165	}
a5ed8940 LP	166
a5ed8940 LP	167	drm_gem_object_release(gem_obj);
b9d47450 SH	168
	169	kfree(cma_obj);
	170	}
	171	EXPORT_SYMBOL_GPL(drm_gem_cma_free_object);
	172
	173	/*
	174	* drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback
	175	* function
	176	*
	177	* This aligns the pitch and size arguments to the minimum required. wrap
	178	* this into your own function if you need bigger alignment.
	179	*/
	180	int drm_gem_cma_dumb_create(struct drm_file *file_priv,
	181	struct drm_device dev, struct drm_mode_create_dumb args)
	182	{
	183	struct drm_gem_cma_object *cma_obj;
	184	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
	185
	186	if (args->pitch < min_pitch)
	187	args->pitch = min_pitch;
	188
	189	if (args->size < args->pitch * args->height)
	190	args->size = args->pitch * args->height;
	191
	192	cma_obj = drm_gem_cma_create_with_handle(file_priv, dev,
	193	args->size, &args->handle);
b03cda51	194	return PTR_ERR_OR_ZERO(cma_obj);
b9d47450 SH	195	}
	196	EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
	197
	198	/*
	199	* drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback
	200	* function
	201	*/
	202	int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
	203	struct drm_device drm, uint32_t handle, uint64_t offset)
	204	{
	205	struct drm_gem_object *gem_obj;
	206
	207	mutex_lock(&drm->struct_mutex);
	208
	209	gem_obj = drm_gem_object_lookup(drm, file_priv, handle);
	210	if (!gem_obj) {
	211	dev_err(drm->dev, "failed to lookup gem object\n");
	212	mutex_unlock(&drm->struct_mutex);
	213	return -EINVAL;
	214	}
	215
0de23977	216	*offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
b9d47450 SH	217
	218	drm_gem_object_unreference(gem_obj);
	219
	220	mutex_unlock(&drm->struct_mutex);
	221
	222	return 0;
	223	}
	224	EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset);
	225
	226	const struct vm_operations_struct drm_gem_cma_vm_ops = {
	227	.open = drm_gem_vm_open,
	228	.close = drm_gem_vm_close,
	229	};
	230	EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops);
	231
ebaf9e03 LP	232	static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
	233	struct vm_area_struct *vma)
	234	{
	235	int ret;
	236
	237	ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT,
	238	vma->vm_end - vma->vm_start, vma->vm_page_prot);
	239	if (ret)
	240	drm_gem_vm_close(vma);
	241
	242	return ret;
	243	}
	244
b9d47450 SH	245	/*
	246	* drm_gem_cma_mmap - (struct file_operation)->mmap callback function
	247	*/
	248	int drm_gem_cma_mmap(struct file filp, struct vm_area_struct vma)
	249	{
b9d47450	250	struct drm_gem_cma_object *cma_obj;
ebaf9e03	251	struct drm_gem_object *gem_obj;
b9d47450 SH	252	int ret;
	253
	254	ret = drm_gem_mmap(filp, vma);
	255	if (ret)
	256	return ret;
	257
	258	gem_obj = vma->vm_private_data;
	259	cma_obj = to_drm_gem_cma_obj(gem_obj);
	260
ebaf9e03	261	return drm_gem_cma_mmap_obj(cma_obj, vma);
b9d47450 SH	262	}
	263	EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);
	264
6f646095 RC	265	#ifdef CONFIG_DEBUG_FS
	266	void drm_gem_cma_describe(struct drm_gem_cma_object cma_obj, struct seq_file m)
	267	{
	268	struct drm_gem_object *obj = &cma_obj->base;
	269	struct drm_device *dev = obj->dev;
0de23977	270	uint64_t off;
6f646095 RC	271
	272	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
	273
0de23977	274	off = drm_vma_node_start(&obj->vma_node);
6f646095 RC	275
	276	seq_printf(m, "%2d (%2d) %08llx %08Zx %p %d",
	277	obj->name, obj->refcount.refcount.counter,
	278	off, cma_obj->paddr, cma_obj->vaddr, obj->size);
	279
	280	seq_printf(m, "\n");
	281	}
	282	EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
	283	#endif
71d7282a	284
78467dc5 JS	285	/* low-level interface prime helpers */
	286	struct sg_table drm_gem_cma_prime_get_sg_table(struct drm_gem_object obj)
	287	{
	288	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
	289	struct sg_table *sgt;
	290	int ret;
	291
	292	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
	293	if (!sgt)
	294	return NULL;
	295
	296	ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
	297	cma_obj->paddr, obj->size);
	298	if (ret < 0)
	299	goto out;
	300
	301	return sgt;
	302
	303	out:
	304	kfree(sgt);
	305	return NULL;
	306	}
	307	EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
	308
	309	struct drm_gem_object *
	310	drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
	311	struct sg_table *sgt)
	312	{
	313	struct drm_gem_cma_object *cma_obj;
	314
	315	if (sgt->nents != 1)
	316	return ERR_PTR(-EINVAL);
	317
	318	/* Create a CMA GEM buffer. */
	319	cma_obj = __drm_gem_cma_create(dev, size);
	320	if (IS_ERR(cma_obj))
	321	return ERR_PTR(PTR_ERR(cma_obj));
	322
	323	cma_obj->paddr = sg_dma_address(sgt->sgl);
	324	cma_obj->sgt = sgt;
	325
	326	DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr, size);
	327
	328	return &cma_obj->base;
	329	}
	330	EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
	331
	332	int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
	333	struct vm_area_struct *vma)
	334	{
	335	struct drm_gem_cma_object *cma_obj;
	336	struct drm_device *dev = obj->dev;
	337	int ret;
	338
	339	mutex_lock(&dev->struct_mutex);
	340	ret = drm_gem_mmap_obj(obj, obj->size, vma);
	341	mutex_unlock(&dev->struct_mutex);
	342	if (ret < 0)
	343	return ret;
	344
	345	cma_obj = to_drm_gem_cma_obj(obj);
	346	return drm_gem_cma_mmap_obj(cma_obj, vma);
	347	}
	348	EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
349
350	void drm_gem_cma_prime_vmap(struct drm_gem_object obj)
351	{
352	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
353
354	return cma_obj->vaddr;
355	}
356	EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
357
358	void drm_gem_cma_prime_vunmap(struct drm_gem_object obj, void vaddr)
359	{
360	/* Nothing to do */
361	}
362	EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);