/**
* drm_gem_cma_prime_get_sg_table - provide a scatter/gather table of pinned
* pages for a CMA GEM object
* @obj: GEM object
*
* This function exports a scatter/gather table suitable for PRIME usage by
* calling the standard DMA mapping API. Drivers using the CMA helpers should
* set this as their DRM driver's ->gem_prime_get_sg_table() callback.
*
* Returns:
* A pointer to the scatter/gather table of pinned pages or NULL on failure.
*/
struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
{
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
struct sg_table *sgt;
int ret;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return NULL;
ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
cma_obj->paddr, obj->size);
if (ret < 0)
goto out;
return sgt;
out:
kfree(sgt);
return NULL;
}
static int isp_stat_bufs_alloc_one(struct device *dev,
struct ispstat_buffer *buf,
unsigned int size)
{
int ret;
buf->virt_addr = dma_alloc_coherent(dev, size, &buf->dma_addr,
GFP_KERNEL | GFP_DMA);
if (!buf->virt_addr)
return -ENOMEM;
ret = dma_get_sgtable(dev, &buf->sgt, buf->virt_addr, buf->dma_addr,
size);
if (ret < 0) {
dma_free_coherent(dev, size, buf->virt_addr, buf->dma_addr);
buf->virt_addr = NULL;
buf->dma_addr = 0;
return ret;
}
return 0;
}
