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#include "drmP.h"
#include "drm.h"
#include "nouveau_drv.h"
#include "nouveau_drm.h"
#include "nouveau_dma.h"
#include <linux/dma-buf.h>
static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
enum dma_data_direction dir)
{
struct nouveau_bo *nvbo = attachment->dmabuf->priv;
struct drm_device *dev = nvbo->gem->dev;
int npages = nvbo->bo.num_pages;
struct sg_table *sg;
int nents;
mutex_lock(&dev->struct_mutex);
sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
mutex_unlock(&dev->struct_mutex);
return sg;
}
static void nouveau_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 nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
{
struct nouveau_bo *nvbo = dma_buf->priv;
if (nvbo->gem->export_dma_buf == dma_buf) {
nvbo->gem->export_dma_buf = NULL;
drm_gem_object_unreference_unlocked(nvbo->gem);
}
}
static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
}
static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
}
static const struct dma_buf_ops nouveau_dmabuf_ops = {
.map_dma_buf = nouveau_gem_map_dma_buf,
.unmap_dma_buf = nouveau_gem_unmap_dma_buf,
.release = nouveau_gem_dmabuf_release,
.kmap = nouveau_gem_kmap,
.kmap_atomic = nouveau_gem_kmap_atomic,
.kunmap = nouveau_gem_kunmap,
.kunmap_atomic = nouveau_gem_kunmap_atomic,
};
static int
nouveau_prime_new(struct drm_device *dev,
size_t size,
struct sg_table *sg,
struct nouveau_bo **pnvbo)
{
struct nouveau_bo *nvbo;
u32 flags = 0;
int ret;
flags = TTM_PL_FLAG_TT;
ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
sg, pnvbo);
if (ret)
return ret;
nvbo = *pnvbo;
/* we restrict allowed domains on nv50+ to only the types
* that were requested at creation time. not possibly on
* earlier chips without busting the ABI.
*/
nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
if (!nvbo->gem) {
nouveau_bo_ref(NULL, pnvbo);
return -ENOMEM;
}
nvbo->gem->driver_private = nvbo;
return 0;
}
struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags)
{
struct nouveau_bo *nvbo = nouveau_gem_object(obj);
int ret = 0;
/* pin buffer into GTT */
ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
if (ret)
return ERR_PTR(-EINVAL);
return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
}
struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct dma_buf_attachment *attach;
struct sg_table *sg;
struct nouveau_bo *nvbo;
int ret;
if (dma_buf->ops == &nouveau_dmabuf_ops) {
nvbo = dma_buf->priv;
if (nvbo->gem) {
if (nvbo->gem->dev == dev) {
drm_gem_object_reference(nvbo->gem);
return nvbo->gem;
}
}
}
/* need to attach */
attach = dma_buf_attach(dma_buf, dev->dev);
if (IS_ERR(attach))
return ERR_PTR(PTR_ERR(attach));
sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR(sg)) {
ret = PTR_ERR(sg);
goto fail_detach;
}
ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
if (ret)
goto fail_unmap;
nvbo->gem->import_attach = attach;
return nvbo->gem;
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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