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* 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 <drm/drmP.h>
#include "i915_drv.h"
#include <linux/dma-buf.h>
static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf)
{
return to_intel_bo(buf->priv);
}
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_mutex_lock_interruptible(obj->base.dev);
if (ret)
goto err;
ret = i915_gem_object_get_pages(obj);
if (ret)
goto err_unlock;
i915_gem_object_pin_pages(obj);
/* 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;
}
ret = sg_alloc_table(st, obj->pages->nents, GFP_KERNEL);
if (ret)
goto err_free;
src = obj->pages->sgl;
dst = st->sgl;
for (i = 0; i < obj->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;
}
mutex_unlock(&obj->base.dev->struct_mutex);
return st;
err_free_sg:
sg_free_table(st);
err_free:
kfree(st);
err_unpin:
i915_gem_object_unpin_pages(obj);
err_unlock:
mutex_unlock(&obj->base.dev->struct_mutex);
err:
return ERR_PTR(ret);
}
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);
mutex_lock(&obj->base.dev->struct_mutex);
dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
sg_free_table(sg);
kfree(sg);
i915_gem_object_unpin_pages(obj);
mutex_unlock(&obj->base.dev->struct_mutex);
}
static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
struct drm_device *dev = obj->base.dev;
struct sg_page_iter sg_iter;
struct page **pages;
int ret, i;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ERR_PTR(ret);
if (obj->dma_buf_vmapping) {
obj->vmapping_count++;
goto out_unlock;
}
ret = i915_gem_object_get_pages(obj);
if (ret)
goto err;
i915_gem_object_pin_pages(obj);
ret = -ENOMEM;
pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages));
if (pages == NULL)
goto err_unpin;
i = 0;
for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0)
pages[i++] = sg_page_iter_page(&sg_iter);
obj->dma_buf_vmapping = vmap(pages, i, 0, PAGE_KERNEL);
drm_free_large(pages);
if (!obj->dma_buf_vmapping)
goto err_unpin;
obj->vmapping_count = 1;
out_unlock:
mutex_unlock(&dev->struct_mutex);
return obj->dma_buf_vmapping;
err_unpin:
i915_gem_object_unpin_pages(obj);
err:
mutex_unlock(&dev->struct_mutex);
return ERR_PTR(ret);
}
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);
struct drm_device *dev = obj->base.dev;
mutex_lock(&dev->struct_mutex);
if (--obj->vmapping_count == 0) {
vunmap(obj->dma_buf_vmapping);
obj->dma_buf_vmapping = NULL;
i915_gem_object_unpin_pages(obj);
}
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 int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, 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 ret;
bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE);
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ret;
ret = i915_gem_object_set_to_cpu_domain(obj, write);
mutex_unlock(&dev->struct_mutex);
return ret;
}
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,
};
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;
if (obj->ops->dmabuf_export) {
int ret = obj->ops->dmabuf_export(obj);
if (ret)
return ERR_PTR(ret);
}
return dma_buf_export(&exp_info);
}
static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
{
struct sg_table *sg;
sg = dma_buf_map_attachment(obj->base.import_attach, DMA_BIDIRECTIONAL);
if (IS_ERR(sg))
return PTR_ERR(sg);
obj->pages = sg;
return 0;
}
static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj)
{
dma_buf_unmap_attachment(obj->base.import_attach,
obj->pages, DMA_BIDIRECTIONAL);
}
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.
*/
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);
get_dma_buf(dma_buf);
obj = i915_gem_object_alloc(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;
return &obj->base;
fail_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}
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