3  * DMA BUF Mapping Helpers
6 #include <linux/dma-buf-mapping.h>
7 #include <linux/dma-resv.h>
21 		 * that does not have any CPU list, only the DMA list.  in fill_sg_entry()
23 		 * importers can't use it. The phys_addr based DMA API  in fill_sg_entry()
58  * struct dma_buf_dma - holds DMA mapping information
60  * @state:  DMA IOVA state relevant in IOMMU-based DMA
61  * @size:   Total size of DMA transfer
78  * @dir:	[in]	direction of DMA transfer
83  * On success, the DMA addresses and lengths in the returned scatterlist are
99 	struct dma_buf_dma *dma;  in dma_buf_phys_vec_to_sgt()  local
111 	dma = kzalloc(sizeof(*dma), GFP_KERNEL);  in dma_buf_phys_vec_to_sgt()
112 	if (!dma)  in dma_buf_phys_vec_to_sgt()
122 		dma->state = kzalloc(sizeof(*dma->state), GFP_KERNEL);  in dma_buf_phys_vec_to_sgt()
123 		if (!dma->state) {  in dma_buf_phys_vec_to_sgt()
128 		dma_iova_try_alloc(attach->dev, dma->state, 0, size);  in dma_buf_phys_vec_to_sgt()
135 	nents = calc_sg_nents(dma->state, phys_vec, nr_ranges, size);  in dma_buf_phys_vec_to_sgt()
136 	ret = sg_alloc_table(&dma->sgt, nents, GFP_KERNEL | __GFP_ZERO);  in dma_buf_phys_vec_to_sgt()
140 	sgl = dma->sgt.sgl;  in dma_buf_phys_vec_to_sgt()
143 		if (!dma->state) {  in dma_buf_phys_vec_to_sgt()
146 		} else if (dma_use_iova(dma->state)) {  in dma_buf_phys_vec_to_sgt()
147 			ret = dma_iova_link(attach->dev, dma->state,  in dma_buf_phys_vec_to_sgt()
164 		if (!dma->state || !dma_use_iova(dma->state))  in dma_buf_phys_vec_to_sgt()
168 	if (dma->state && dma_use_iova(dma->state)) {  in dma_buf_phys_vec_to_sgt()
170 		ret = dma_iova_sync(attach->dev, dma->state, 0, mapped_len);  in dma_buf_phys_vec_to_sgt()
174 		sgl = fill_sg_entry(sgl, mapped_len, dma->state->addr);  in dma_buf_phys_vec_to_sgt()
177 	dma->size = size;  in dma_buf_phys_vec_to_sgt()
183 	dma->sgt.orig_nents = 0;  in dma_buf_phys_vec_to_sgt()
191 	return &dma->sgt;  in dma_buf_phys_vec_to_sgt()
194 	if (!i || !dma->state) {  in dma_buf_phys_vec_to_sgt()
196 	} else if (dma_use_iova(dma->state)) {  in dma_buf_phys_vec_to_sgt()
197 		dma_iova_destroy(attach->dev, dma->state, mapped_len, dir,  in dma_buf_phys_vec_to_sgt()
200 		for_each_sgtable_dma_sg(&dma->sgt, sgl, i)  in dma_buf_phys_vec_to_sgt()
204 	sg_free_table(&dma->sgt);  in dma_buf_phys_vec_to_sgt()
206 	kfree(dma->state);  in dma_buf_phys_vec_to_sgt()
208 	kfree(dma);  in dma_buf_phys_vec_to_sgt()
217  * @dir:	[in]	direction of DMA transfer
219  * This unmaps a DMA mapping for @attached obtained
225 	struct dma_buf_dma *dma = container_of(sgt, struct dma_buf_dma, sgt);  in dma_buf_free_sgt()  local
230 	if (!dma->state) {  in dma_buf_free_sgt()
232 	} else if (dma_use_iova(dma->state)) {  in dma_buf_free_sgt()
233 		dma_iova_destroy(attach->dev, dma->state, dma->size, dir,  in dma_buf_free_sgt()
244 	kfree(dma->state);  in dma_buf_free_sgt()
245 	kfree(dma);  in dma_buf_free_sgt()