Release 4.11 drivers/gpu/drm/i915/i915_gem_dmabuf.c

Directory: drivers/gpu/drm/i915
/*
 * 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 <linux/dma-buf.h>
#include <linux/reservation.h>

#include <drm/drmP.h>

#include "i915_drv.h"



static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf)
{
	return to_intel_bo(buf->priv);
}

Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%



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 = dma_buf_to_obj(attachment->dmabuf);
	struct sg_table *st;
	struct scatterlist *src, *dst;
	int ret, i;

	ret = i915_gem_object_pin_pages(obj);
	if (ret)
		goto err;

	/* Copy sg so that we make an independent mapping */
	st = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
	if (st == NULL) {
		ret = -ENOMEM;
		goto err_unpin_pages;
	}

	ret = sg_alloc_table(st, obj->mm.pages->nents, GFP_KERNEL);
	if (ret)
		goto err_free;

	src = obj->mm.pages->sgl;
	dst = st->sgl;
	for (i = 0; i < obj->mm.pages->nents; i++) {
		sg_set_page(dst, sg_page(src), src->length, 0);
		dst = sg_next(dst);
		src = sg_next(src);
	}

	if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
		ret = -ENOMEM;
		goto err_free_sg;
	}

	return st;

err_free_sg:
	sg_free_table(st);
err_free:
	kfree(st);
err_unpin_pages:
	i915_gem_object_unpin_pages(obj);
err:
	return ERR_PTR(ret);
}

Contributors
Person Tokens Prop Commits CommitProp
Chris Wilson 154 63.11% 5 55.56%
Daniel Vetter 86 35.25% 2 22.22%
Imre Deak 3 1.23% 1 11.11%
Dave Airlie 1 0.41% 1 11.11%
Total 244 100.00% 9 100.00%



static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
				   struct sg_table *sg,
				   enum dma_data_direction dir)
{
	struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);

	dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
	sg_free_table(sg);
	kfree(sg);

	i915_gem_object_unpin_pages(obj);
}

Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 63 98.44% 3 75.00%
Dave Airlie 1 1.56% 1 25.00%
Total 64 100.00% 4 100.00%



static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);

	return i915_gem_object_pin_map(obj, I915_MAP_WB);
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Airlie 20 66.67% 1 16.67%
Chris Wilson 7 23.33% 4 66.67%
Daniel Vetter 3 10.00% 1 16.67%
Total 30 100.00% 6 100.00%



static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);

	i915_gem_object_unpin_map(obj);
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Airlie 26 86.67% 1 33.33%
Daniel Vetter 3 10.00% 1 33.33%
Chris Wilson 1 3.33% 1 33.33%
Total 30 100.00% 3 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



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

}
Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



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

}

Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%



static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
	int ret;

	if (obj->base.size < vma->vm_end - vma->vm_start)
		return -EINVAL;

	if (!obj->base.filp)
		return -ENODEV;

	ret = call_mmap(obj->base.filp, vma);
	if (ret)
		return ret;

	fput(vma->vm_file);
	vma->vm_file = get_file(obj->base.filp);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Tiago Vignatti 84 80.00% 1 33.33%
Dave Airlie 20 19.05% 1 33.33%
Miklos Szeredi 1 0.95% 1 33.33%
Total 105 100.00% 3 100.00%



static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
{
	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
	struct drm_device *dev = obj->base.dev;
	bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE);
	int err;

	err = i915_gem_object_pin_pages(obj);
	if (err)
		return err;

	err = i915_mutex_lock_interruptible(dev);
	if (err)
		goto out;

	err = i915_gem_object_set_to_cpu_domain(obj, write);
	mutex_unlock(&dev->struct_mutex);

out:
	i915_gem_object_unpin_pages(obj);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Airlie 73 68.22% 1 33.33%
Chris Wilson 31 28.97% 1 33.33%
Daniel Vetter 3 2.80% 1 33.33%
Total 107 100.00% 3 100.00%



static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
{
	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
	struct drm_device *dev = obj->base.dev;
	int err;

	err = i915_gem_object_pin_pages(obj);
	if (err)
		return err;

	err = i915_mutex_lock_interruptible(dev);
	if (err)
		goto out;

	err = i915_gem_object_set_to_gtt_domain(obj, false);
	mutex_unlock(&dev->struct_mutex);

out:
	i915_gem_object_unpin_pages(obj);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Tiago Vignatti 56 59.57% 1 33.33%
Chris Wilson 38 40.43% 2 66.67%
Total 94 100.00% 3 100.00%


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 = drm_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,
	.begin_cpu_access = i915_gem_begin_cpu_access,
	.end_cpu_access = i915_gem_end_cpu_access,
};



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);
	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);

	exp_info.ops = &i915_dmabuf_ops;
	exp_info.size = gem_obj->size;
	exp_info.flags = flags;
	exp_info.priv = gem_obj;
	exp_info.resv = obj->resv;

	if (obj->ops->dmabuf_export) {
		int ret = obj->ops->dmabuf_export(obj);
		if (ret)
			return ERR_PTR(ret);
	}

	return drm_gem_dmabuf_export(dev, &exp_info);
}

Contributors
Person Tokens Prop Commits CommitProp
Chris Wilson 54 48.65% 3 60.00%
Sumit Semwal 33 29.73% 1 20.00%
Daniel Vetter 24 21.62% 1 20.00%
Total 111 100.00% 5 100.00%


static struct sg_table *

i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
{
	return dma_buf_map_attachment(obj->base.import_attach,
				      DMA_BIDIRECTIONAL);
}

Contributors
Person Tokens Prop Commits CommitProp
Chris Wilson 25 100.00% 2 100.00%
Total 25 100.00% 2 100.00%



static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj,
					     struct sg_table *pages)
{
	dma_buf_unmap_attachment(obj->base.import_attach, pages,
				 DMA_BIDIRECTIONAL);
}

Contributors
Person Tokens Prop Commits CommitProp
Chris Wilson 29 100.00% 2 100.00%
Total 29 100.00% 2 100.00%


static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = {
	.get_pages = i915_gem_object_get_pages_dmabuf,
	.put_pages = i915_gem_object_put_pages_dmabuf,
};



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

	/* is this one of own objects? */
	if (dma_buf->ops == &i915_dmabuf_ops) {
		obj = dma_buf_to_obj(dma_buf);
		/* is it from our device? */
		if (obj->base.dev == dev) {
			/*
                         * Importing dmabuf exported from out own gem increases
                         * refcount on gem itself instead of f_count of dmabuf.
                         */
			return &i915_gem_object_get(obj)->base;
		}
	}

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

	get_dma_buf(dma_buf);

	obj = i915_gem_object_alloc(to_i915(dev));
	if (obj == NULL) {
		ret = -ENOMEM;
		goto fail_detach;
	}

	drm_gem_private_object_init(dev, &obj->base, dma_buf->size);
	i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops);
	obj->base.import_attach = attach;
	obj->resv = dma_buf->resv;

	/* We use GTT as shorthand for a coherent domain, one that is
         * neither in the GPU cache nor in the CPU cache, where all
         * writes are immediately visible in memory. (That's not strictly
         * true, but it's close! There are internal buffers such as the
         * write-combined buffer or a delay through the chipset for GTT
         * writes that do require us to treat GTT as a separate cache domain.)
         */
	obj->base.read_domains = I915_GEM_DOMAIN_GTT;
	obj->base.write_domain = 0;

	return &obj->base;

fail_detach:
	dma_buf_detach(dma_buf, attach);
	dma_buf_put(dma_buf);

	return ERR_PTR(ret);
}
Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 156 74.64% 2 18.18%
Chris Wilson 39 18.66% 6 54.55%
Imre Deak 10 4.78% 1 9.09%
Tvrtko A. Ursulin 3 1.44% 1 9.09%
Seung-Woo Kim 1 0.48% 1 9.09%
Total 209 100.00% 11 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Daniel Vetter 481 38.73% 4 11.76%
Chris Wilson 402 32.37% 18 52.94%
Dave Airlie 163 13.12% 4 11.76%
Tiago Vignatti 145 11.67% 2 5.88%
Sumit Semwal 33 2.66% 1 2.94%
Imre Deak 13 1.05% 2 5.88%
Tvrtko A. Ursulin 3 0.24% 1 2.94%
Seung-Woo Kim 1 0.08% 1 2.94%
Miklos Szeredi 1 0.08% 1 2.94%
Total 1242 100.00% 34 100.00%
Directory: drivers/gpu/drm/i915

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Person	Tokens	Prop	Commits	CommitProp
Daniel Vetter	21	100.00%	1	100.00%
Total	21	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/i915/i915_gem_dmabuf.c

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