[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_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,
};

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
	77	static void i915_gem_dmabuf_kmap_atomic(struct dma_buf dma_buf, unsigned long page_num)
	78	{
	79	return NULL;
	80	}
	81
	82	static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf dma_buf, unsigned long page_num, void addr)
	83	{
	84
	85	}
	86	static void i915_gem_dmabuf_kmap(struct dma_buf dma_buf, unsigned long page_num)
	87	{
	88	return NULL;
	89	}
	90
	91	static void i915_gem_dmabuf_kunmap(struct dma_buf dma_buf, unsigned long page_num, void addr)
	92	{
	93
	94	}
	95
2dad9d4d DA	96	static int i915_gem_dmabuf_mmap(struct dma_buf dma_buf, struct vm_area_struct vma)
	97	{
	98	return -EINVAL;
	99	}
	100
6a101cb2	101	static const struct dma_buf_ops i915_dmabuf_ops = {
1286ff73 DV	102	.map_dma_buf = i915_gem_map_dma_buf,
	103	.unmap_dma_buf = i915_gem_unmap_dma_buf,
	104	.release = i915_gem_dmabuf_release,
	105	.kmap = i915_gem_dmabuf_kmap,
	106	.kmap_atomic = i915_gem_dmabuf_kmap_atomic,
	107	.kunmap = i915_gem_dmabuf_kunmap,
	108	.kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
2dad9d4d	109	.mmap = i915_gem_dmabuf_mmap,
1286ff73 DV	110	};
	111
	112	struct dma_buf i915_gem_prime_export(struct drm_device dev,
	113	struct drm_gem_object *gem_obj, int flags)
	114	{
	115	struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
	116
	117	return dma_buf_export(obj, &i915_dmabuf_ops,
	118	obj->base.size, 0600);
	119	}
	120
	121	struct drm_gem_object i915_gem_prime_import(struct drm_device dev,
	122	struct dma_buf *dma_buf)
	123	{
	124	struct dma_buf_attachment *attach;
	125	struct sg_table *sg;
	126	struct drm_i915_gem_object *obj;
	127	int npages;
	128	int size;
	129	int ret;
	130
	131	/* is this one of own objects? */
	132	if (dma_buf->ops == &i915_dmabuf_ops) {
	133	obj = dma_buf->priv;
	134	/* is it from our device? */
	135	if (obj->base.dev == dev) {
	136	drm_gem_object_reference(&obj->base);
	137	return &obj->base;
	138	}
	139	}
	140
	141	/* need to attach */
	142	attach = dma_buf_attach(dma_buf, dev->dev);
	143	if (IS_ERR(attach))
	144	return ERR_CAST(attach);
	145
	146	sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
	147	if (IS_ERR(sg)) {
	148	ret = PTR_ERR(sg);
	149	goto fail_detach;
	150	}
	151
	152	size = dma_buf->size;
	153	npages = size / PAGE_SIZE;
	154
	155	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	156	if (obj == NULL) {
	157	ret = -ENOMEM;
	158	goto fail_unmap;
	159	}
	160
	161	ret = drm_gem_private_object_init(dev, &obj->base, size);
	162	if (ret) {
	163	kfree(obj);
	164	goto fail_unmap;
	165	}
	166
	167	obj->sg_table = sg;
	168	obj->base.import_attach = attach;
	169
	170	return &obj->base;
	171
	172	fail_unmap:
	173	dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
174	fail_detach:
175	dma_buf_detach(dma_buf, attach);
176	return ERR_PTR(ret);
177	}