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/*
* Copyright 2012 Advanced Micro Devices, 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
*
* based on nouveau_prime.c
*
* Authors: Alex Deucher
*/
#include <drm/drmP.h>
#include "radeon.h"
#include <drm/radeon_drm.h>
#include <linux/dma-buf.h>
static struct sg_table *radeon_gem_map_dma_buf(struct dma_buf_attachment *attachment,
enum dma_data_direction dir)
{
struct radeon_bo *bo = attachment->dmabuf->priv;
struct drm_device *dev = bo->rdev->ddev;
int npages = bo->tbo.num_pages;
struct sg_table *sg;
int nents;
mutex_lock(&dev->struct_mutex);
sg = drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
mutex_unlock(&dev->struct_mutex);
return sg;
}
static void radeon_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 radeon_gem_dmabuf_release(struct dma_buf *dma_buf)
{
struct radeon_bo *bo = dma_buf->priv;
if (bo->gem_base.export_dma_buf == dma_buf) {
DRM_ERROR("unreference dmabuf %p\n", &bo->gem_base);
bo->gem_base.export_dma_buf = NULL;
drm_gem_object_unreference_unlocked(&bo->gem_base);
}
}
static void *radeon_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
static void radeon_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
}
static void *radeon_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
static void radeon_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
}
static int radeon_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
return -EINVAL;
}
static void *radeon_gem_prime_vmap(struct dma_buf *dma_buf)
{
struct radeon_bo *bo = dma_buf->priv;
struct drm_device *dev = bo->rdev->ddev;
int ret;
mutex_lock(&dev->struct_mutex);
if (bo->vmapping_count) {
bo->vmapping_count++;
goto out_unlock;
}
ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
&bo->dma_buf_vmap);
if (ret) {
mutex_unlock(&dev->struct_mutex);
return ERR_PTR(ret);
}
bo->vmapping_count = 1;
out_unlock:
mutex_unlock(&dev->struct_mutex);
return bo->dma_buf_vmap.virtual;
}
static void radeon_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
struct radeon_bo *bo = dma_buf->priv;
struct drm_device *dev = bo->rdev->ddev;
mutex_lock(&dev->struct_mutex);
bo->vmapping_count--;
if (bo->vmapping_count == 0) {
ttm_bo_kunmap(&bo->dma_buf_vmap);
}
mutex_unlock(&dev->struct_mutex);
}
const static struct dma_buf_ops radeon_dmabuf_ops = {
.map_dma_buf = radeon_gem_map_dma_buf,
.unmap_dma_buf = radeon_gem_unmap_dma_buf,
.release = radeon_gem_dmabuf_release,
.kmap = radeon_gem_kmap,
.kmap_atomic = radeon_gem_kmap_atomic,
.kunmap = radeon_gem_kunmap,
.kunmap_atomic = radeon_gem_kunmap_atomic,
.mmap = radeon_gem_prime_mmap,
.vmap = radeon_gem_prime_vmap,
.vunmap = radeon_gem_prime_vunmap,
};
static int radeon_prime_create(struct drm_device *dev,
size_t size,
struct sg_table *sg,
struct radeon_bo **pbo)
{
struct radeon_device *rdev = dev->dev_private;
struct radeon_bo *bo;
int ret;
ret = radeon_bo_create(rdev, size, PAGE_SIZE, false,
RADEON_GEM_DOMAIN_GTT, sg, pbo);
if (ret)
return ret;
bo = *pbo;
bo->gem_base.driver_private = bo;
mutex_lock(&rdev->gem.mutex);
list_add_tail(&bo->list, &rdev->gem.objects);
mutex_unlock(&rdev->gem.mutex);
return 0;
}
struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj,
int flags)
{
struct radeon_bo *bo = gem_to_radeon_bo(obj);
int ret = 0;
ret = radeon_bo_reserve(bo, false);
if (unlikely(ret != 0))
return ERR_PTR(ret);
/* pin buffer into GTT */
ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
if (ret) {
radeon_bo_unreserve(bo);
return ERR_PTR(ret);
}
radeon_bo_unreserve(bo);
return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags);
}
struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct dma_buf_attachment *attach;
struct sg_table *sg;
struct radeon_bo *bo;
int ret;
if (dma_buf->ops == &radeon_dmabuf_ops) {
bo = dma_buf->priv;
if (bo->gem_base.dev == dev) {
drm_gem_object_reference(&bo->gem_base);
return &bo->gem_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;
}
ret = radeon_prime_create(dev, dma_buf->size, sg, &bo);
if (ret)
goto fail_unmap;
bo->gem_base.import_attach = attach;
return &bo->gem_base;
fail_unmap:
dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
fail_detach:
dma_buf_detach(dma_buf, attach);
return ERR_PTR(ret);
}
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