{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct sg_table *sgt;
+ int ret;
if (WARN_ON(dir == DMA_NONE))
return ERR_PTR(-EINVAL);
if (IS_ERR(sgt))
return sgt;
- if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
- DMA_ATTR_SKIP_CPU_SYNC)) {
+ ret = dma_map_sgtable(attach->dev, sgt, dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ if (ret) {
sg_free_table(sgt);
kfree(sgt);
- sgt = ERR_PTR(-ENOMEM);
+ sgt = ERR_PTR(ret);
}
return sgt;
if (!sgt)
return;
- dma_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
- DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(attach->dev, sgt, dir, DMA_ATTR_SKIP_CPU_SYNC);
sg_free_table(sgt);
kfree(sgt);
}
/**
* drm_prime_pages_to_sg - converts a page array into an sg list
+ * @dev: DRM device
* @pages: pointer to the array of page pointers to convert
* @nr_pages: length of the page vector
*
struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev,
struct page **pages, unsigned int nr_pages)
{
- struct sg_table *sg = NULL;
+ struct sg_table *sg;
+ struct scatterlist *sge;
size_t max_segment = 0;
- int ret;
sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
- if (!sg) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!sg)
+ return ERR_PTR(-ENOMEM);
if (dev)
max_segment = dma_max_mapping_size(dev->dev);
if (max_segment == 0 || max_segment > SCATTERLIST_MAX_SEGMENT)
max_segment = SCATTERLIST_MAX_SEGMENT;
- ret = __sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
+ sge = __sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
nr_pages << PAGE_SHIFT,
- max_segment, GFP_KERNEL);
- if (ret)
- goto out;
-
+ max_segment,
+ NULL, 0, GFP_KERNEL);
+ if (IS_ERR(sge)) {
+ kfree(sg);
+ sg = ERR_CAST(sge);
+ }
return sg;
-out:
- kfree(sg);
- return ERR_PTR(ret);
}
EXPORT_SYMBOL(drm_prime_pages_to_sg);
/**
+ * drm_prime_get_contiguous_size - returns the contiguous size of the buffer
+ * @sgt: sg_table describing the buffer to check
+ *
+ * This helper calculates the contiguous size in the DMA address space
+ * of the the buffer described by the provided sg_table.
+ *
+ * This is useful for implementing
+ * &drm_gem_object_funcs.gem_prime_import_sg_table.
+ */
+unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt)
+{
+ dma_addr_t expected = sg_dma_address(sgt->sgl);
+ struct scatterlist *sg;
+ unsigned long size = 0;
+ int i;
+
+ for_each_sgtable_dma_sg(sgt, sg, i) {
+ unsigned int len = sg_dma_len(sg);
+
+ if (!len)
+ break;
+ if (sg_dma_address(sg) != expected)
+ break;
+ expected += len;
+ size += len;
+ }
+ return size;
+}
+EXPORT_SYMBOL(drm_prime_get_contiguous_size);
+
+/**
* drm_gem_prime_export - helper library implementation of the export callback
* @obj: GEM object to export
* @flags: flags like DRM_CLOEXEC and DRM_RDWR
int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
dma_addr_t *addrs, int max_entries)
{
- unsigned count;
- struct scatterlist *sg;
- struct page *page;
- u32 page_len, page_index;
- dma_addr_t addr;
- u32 dma_len, dma_index;
-
- /*
- * Scatterlist elements contains both pages and DMA addresses, but
- * one shoud not assume 1:1 relation between them. The sg->length is
- * the size of the physical memory chunk described by the sg->page,
- * while sg_dma_len(sg) is the size of the DMA (IO virtual) chunk
- * described by the sg_dma_address(sg).
- */
- page_index = 0;
- dma_index = 0;
- for_each_sg(sgt->sgl, sg, sgt->nents, count) {
- page_len = sg->length;
- page = sg_page(sg);
- dma_len = sg_dma_len(sg);
- addr = sg_dma_address(sg);
-
- while (pages && page_len > 0) {
- if (WARN_ON(page_index >= max_entries))
+ struct sg_dma_page_iter dma_iter;
+ struct sg_page_iter page_iter;
+ struct page **p = pages;
+ dma_addr_t *a = addrs;
+
+ if (pages) {
+ for_each_sgtable_page(sgt, &page_iter, 0) {
+ if (WARN_ON(p - pages >= max_entries))
return -1;
- pages[page_index] = page;
- page++;
- page_len -= PAGE_SIZE;
- page_index++;
+ *p++ = sg_page_iter_page(&page_iter);
}
- while (addrs && dma_len > 0) {
- if (WARN_ON(dma_index >= max_entries))
+ }
+ if (addrs) {
+ for_each_sgtable_dma_page(sgt, &dma_iter, 0) {
+ if (WARN_ON(a - addrs >= max_entries))
return -1;
- addrs[dma_index] = addr;
- addr += PAGE_SIZE;
- dma_len -= PAGE_SIZE;
- dma_index++;
+ *a++ = sg_page_iter_dma_address(&dma_iter);
}
}
+
return 0;
}
EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);