[deliverable/linux.git] / drivers / gpu / drm / i915 / i915_gem_dmabuf.c

/*
 * Copyright 2012 Red Hat Inc
 *
 * 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 (including the next
 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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 <airlied@redhat.com>
 */
#include "drmP.h"
#include "i915_drv.h"
#include <linux/dma-buf.h>

static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment,
				      enum dma_data_direction dir)
{
	struct drm_i915_gem_object *obj = attachment->dmabuf->priv;
	struct drm_device *dev = obj->base.dev;
	int npages = obj->base.size / PAGE_SIZE;
	struct sg_table *sg = NULL;
	int ret;
	int nents;

	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ERR_PTR(ret);

	if (!obj->pages) {
		ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN);
		if (ret)
			goto out;
	}

	/* link the pages into an SG then map the sg */
	sg = drm_prime_pages_to_sg(obj->pages, npages);
	nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
out:
	mutex_unlock(&dev->struct_mutex);
	return sg;
}

static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
			    struct sg_table *sg, enum dma_data_direction dir)
{
	dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
	sg_free_table(sg);
	kfree(sg);
}

static void i915_gem_dmabuf_release(struct dma_buf *dma_buf)
{
	struct drm_i915_gem_object *obj = dma_buf->priv;

	if (obj->base.export_dma_buf == dma_buf) {
		/* drop the reference on the export fd holds */
		obj->base.export_dma_buf = NULL;
		drm_gem_object_unreference_unlocked(&obj->base);
	}
}

static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
	struct drm_i915_gem_object *obj = dma_buf->priv;
	struct drm_device *dev = obj->base.dev;
	int ret;

	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ERR_PTR(ret);

	if (obj->dma_buf_vmapping) {
		obj->vmapping_count++;
		goto out_unlock;
	}

	if (!obj->pages) {
		ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN);
		if (ret) {
			mutex_unlock(&dev->struct_mutex);
			return ERR_PTR(ret);
		}
	}

	obj->dma_buf_vmapping = vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL);
	if (!obj->dma_buf_vmapping) {
		DRM_ERROR("failed to vmap object\n");
		goto out_unlock;
	}

	obj->vmapping_count = 1;
out_unlock:
	mutex_unlock(&dev->struct_mutex);
	return obj->dma_buf_vmapping;
}

static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
	struct drm_i915_gem_object *obj = dma_buf->priv;
	struct drm_device *dev = obj->base.dev;
	int ret;

	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return;

	--obj->vmapping_count;
	if (obj->vmapping_count == 0) {
		vunmap(obj->dma_buf_vmapping);
		obj->dma_buf_vmapping = NULL;
	}
	mutex_unlock(&dev->struct_mutex);
}

static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
{
	return NULL;
}

static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{

}
static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
{
	return NULL;
}

static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{

}

static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
	return -EINVAL;
}

static const struct dma_buf_ops i915_dmabuf_ops =  {
	.map_dma_buf = i915_gem_map_dma_buf,
	.unmap_dma_buf = i915_gem_unmap_dma_buf,
	.release = i915_gem_dmabuf_release,
	.kmap = i915_gem_dmabuf_kmap,
	.kmap_atomic = i915_gem_dmabuf_kmap_atomic,
	.kunmap = i915_gem_dmabuf_kunmap,
	.kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
	.mmap = i915_gem_dmabuf_mmap,
	.vmap = i915_gem_dmabuf_vmap,
	.vunmap = i915_gem_dmabuf_vunmap,
};

struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
				struct drm_gem_object *gem_obj, int flags)
{
	struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);

	return dma_buf_export(obj, &i915_dmabuf_ops,
						  obj->base.size, 0600);
}

struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
				struct dma_buf *dma_buf)
{
	struct dma_buf_attachment *attach;
	struct sg_table *sg;
	struct drm_i915_gem_object *obj;
	int npages;
	int size;
	int ret;

	/* is this one of own objects? */
	if (dma_buf->ops == &i915_dmabuf_ops) {
		obj = dma_buf->priv;
		/* is it from our device? */
		if (obj->base.dev == dev) {
			drm_gem_object_reference(&obj->base);
			return &obj->base;
		}
	}

	/* need to attach */
	attach = dma_buf_attach(dma_buf, dev->dev);
	if (IS_ERR(attach))
		return ERR_CAST(attach);

	sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
	if (IS_ERR(sg)) {
		ret = PTR_ERR(sg);
		goto fail_detach;
	}

	size = dma_buf->size;
	npages = size / PAGE_SIZE;

	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	if (obj == NULL) {
		ret = -ENOMEM;
		goto fail_unmap;
	}

	ret = drm_gem_private_object_init(dev, &obj->base, size);
	if (ret) {
		kfree(obj);
		goto fail_unmap;
	}

	obj->sg_table = sg;
	obj->base.import_attach = attach;

	return &obj->base;

fail_unmap:
	dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
fail_detach:
	dma_buf_detach(dma_buf, attach);
	return ERR_PTR(ret);
}
Commit	Line	Data
1286ff73 DV	1	/*
	2	* Copyright 2012 Red Hat Inc
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice (including the next
	12	* paragraph) shall be included in all copies or substantial portions of the
	13	* Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	21	* DEALINGS IN THE SOFTWARE.
	22	*
	23	* Authors:
	24	* Dave Airlie <airlied@redhat.com>
	25	*/
	26	#include "drmP.h"
	27	#include "i915_drv.h"
	28	#include <linux/dma-buf.h>
	29
6a101cb2	30	static struct sg_table i915_gem_map_dma_buf(struct dma_buf_attachment attachment,
1286ff73 DV	31	enum dma_data_direction dir)
	32	{
	33	struct drm_i915_gem_object *obj = attachment->dmabuf->priv;
	34	struct drm_device *dev = obj->base.dev;
	35	int npages = obj->base.size / PAGE_SIZE;
	36	struct sg_table *sg = NULL;
	37	int ret;
	38	int nents;
	39
	40	ret = i915_mutex_lock_interruptible(dev);
	41	if (ret)
	42	return ERR_PTR(ret);
	43
	44	if (!obj->pages) {
	45	ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY \| __GFP_NOWARN);
	46	if (ret)
	47	goto out;
	48	}
	49
	50	/* link the pages into an SG then map the sg */
	51	sg = drm_prime_pages_to_sg(obj->pages, npages);
	52	nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
	53	out:
	54	mutex_unlock(&dev->struct_mutex);
	55	return sg;
	56	}
	57
6a101cb2	58	static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
1286ff73 DV	59	struct sg_table *sg, enum dma_data_direction dir)
	60	{
	61	dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
	62	sg_free_table(sg);
	63	kfree(sg);
	64	}
	65
6a101cb2	66	static void i915_gem_dmabuf_release(struct dma_buf *dma_buf)
1286ff73 DV	67	{
	68	struct drm_i915_gem_object *obj = dma_buf->priv;
	69
	70	if (obj->base.export_dma_buf == dma_buf) {
	71	/* drop the reference on the export fd holds */
	72	obj->base.export_dma_buf = NULL;
	73	drm_gem_object_unreference_unlocked(&obj->base);
	74	}
	75	}
	76
9a70cc2a DA	77	static void i915_gem_dmabuf_vmap(struct dma_buf dma_buf)
	78	{
	79	struct drm_i915_gem_object *obj = dma_buf->priv;
	80	struct drm_device *dev = obj->base.dev;
	81	int ret;
	82
	83	ret = i915_mutex_lock_interruptible(dev);
	84	if (ret)
	85	return ERR_PTR(ret);
	86
	87	if (obj->dma_buf_vmapping) {
	88	obj->vmapping_count++;
	89	goto out_unlock;
	90	}
	91
	92	if (!obj->pages) {
	93	ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY \| __GFP_NOWARN);
	94	if (ret) {
	95	mutex_unlock(&dev->struct_mutex);
	96	return ERR_PTR(ret);
	97	}
	98	}
	99
	100	obj->dma_buf_vmapping = vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL);
	101	if (!obj->dma_buf_vmapping) {
	102	DRM_ERROR("failed to vmap object\n");
	103	goto out_unlock;
	104	}
	105
	106	obj->vmapping_count = 1;
	107	out_unlock:
	108	mutex_unlock(&dev->struct_mutex);
	109	return obj->dma_buf_vmapping;
	110	}
	111
	112	static void i915_gem_dmabuf_vunmap(struct dma_buf dma_buf, void vaddr)
	113	{
	114	struct drm_i915_gem_object *obj = dma_buf->priv;
	115	struct drm_device *dev = obj->base.dev;
	116	int ret;
	117
	118	ret = i915_mutex_lock_interruptible(dev);
	119	if (ret)
	120	return;
	121
	122	--obj->vmapping_count;
	123	if (obj->vmapping_count == 0) {
	124	vunmap(obj->dma_buf_vmapping);
	125	obj->dma_buf_vmapping = NULL;
	126	}
	127	mutex_unlock(&dev->struct_mutex);
	128	}
	129
1286ff73 DV	130	static void i915_gem_dmabuf_kmap_atomic(struct dma_buf dma_buf, unsigned long page_num)
	131	{
	132	return NULL;
	133	}
	134
	135	static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf dma_buf, unsigned long page_num, void addr)
	136	{
	137
	138	}
	139	static void i915_gem_dmabuf_kmap(struct dma_buf dma_buf, unsigned long page_num)
	140	{
	141	return NULL;
	142	}
	143
	144	static void i915_gem_dmabuf_kunmap(struct dma_buf dma_buf, unsigned long page_num, void addr)
	145	{
	146
	147	}
	148
2dad9d4d DA	149	static int i915_gem_dmabuf_mmap(struct dma_buf dma_buf, struct vm_area_struct vma)
	150	{
	151	return -EINVAL;
	152	}
	153
6a101cb2	154	static const struct dma_buf_ops i915_dmabuf_ops = {
1286ff73 DV	155	.map_dma_buf = i915_gem_map_dma_buf,
	156	.unmap_dma_buf = i915_gem_unmap_dma_buf,
	157	.release = i915_gem_dmabuf_release,
	158	.kmap = i915_gem_dmabuf_kmap,
	159	.kmap_atomic = i915_gem_dmabuf_kmap_atomic,
	160	.kunmap = i915_gem_dmabuf_kunmap,
	161	.kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
2dad9d4d	162	.mmap = i915_gem_dmabuf_mmap,
9a70cc2a DA	163	.vmap = i915_gem_dmabuf_vmap,
9a70cc2a DA	164	.vunmap = i915_gem_dmabuf_vunmap,
1286ff73 DV	165	};
	166
	167	struct dma_buf i915_gem_prime_export(struct drm_device dev,
	168	struct drm_gem_object *gem_obj, int flags)
	169	{
	170	struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
	171
	172	return dma_buf_export(obj, &i915_dmabuf_ops,
	173	obj->base.size, 0600);
	174	}
	175
	176	struct drm_gem_object i915_gem_prime_import(struct drm_device dev,
	177	struct dma_buf *dma_buf)
	178	{
	179	struct dma_buf_attachment *attach;
	180	struct sg_table *sg;
	181	struct drm_i915_gem_object *obj;
	182	int npages;
	183	int size;
	184	int ret;
	185
	186	/* is this one of own objects? */
	187	if (dma_buf->ops == &i915_dmabuf_ops) {
	188	obj = dma_buf->priv;
	189	/* is it from our device? */
	190	if (obj->base.dev == dev) {
	191	drm_gem_object_reference(&obj->base);
	192	return &obj->base;
	193	}
	194	}
	195
	196	/* need to attach */
	197	attach = dma_buf_attach(dma_buf, dev->dev);
	198	if (IS_ERR(attach))
	199	return ERR_CAST(attach);
	200
	201	sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
	202	if (IS_ERR(sg)) {
	203	ret = PTR_ERR(sg);
	204	goto fail_detach;
	205	}
	206
	207	size = dma_buf->size;
	208	npages = size / PAGE_SIZE;
	209
	210	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	211	if (obj == NULL) {
	212	ret = -ENOMEM;
	213	goto fail_unmap;
	214	}
	215
	216	ret = drm_gem_private_object_init(dev, &obj->base, size);
	217	if (ret) {
	218	kfree(obj);
	219	goto fail_unmap;
	220	}
	221
	222	obj->sg_table = sg;
	223	obj->base.import_attach = attach;
	224
	225	return &obj->base;
	226
	227	fail_unmap:
	228	dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
229	fail_detach:
230	dma_buf_detach(dma_buf, attach);
231	return ERR_PTR(ret);
232	}