3     User DMA
25 int ivtv_udma_fill_sg_list (struct ivtv_user_dma *dma, struct ivtv_dma_page_info *dma_page, int map…  in ivtv_udma_fill_sg_list()  argument
40 		if (PageHighMem(dma->map[map_offset])) {  in ivtv_udma_fill_sg_list()
43 			if (dma->bouncemap[map_offset] == NULL)  in ivtv_udma_fill_sg_list()
44 				dma->bouncemap[map_offset] = alloc_page(GFP_KERNEL);  in ivtv_udma_fill_sg_list()
45 			if (dma->bouncemap[map_offset] == NULL)  in ivtv_udma_fill_sg_list()
48 			src = kmap_atomic(dma->map[map_offset]) + offset;  in ivtv_udma_fill_sg_list()
49 			memcpy(page_address(dma->bouncemap[map_offset]) + offset, src, len);  in ivtv_udma_fill_sg_list()
52 			sg_set_page(&dma->SGlist[map_offset], dma->bouncemap[map_offset], len, offset);  in ivtv_udma_fill_sg_list()
55 			sg_set_page(&dma->SGlist[map_offset], dma->map[map_offset], len, offset);  in ivtv_udma_fill_sg_list()
63 void ivtv_udma_fill_sg_array (struct ivtv_user_dma *dma, u32 buffer_offset, u32 buffer_offset_2, u3…  in ivtv_udma_fill_sg_array()  argument
67 	for_each_sg(dma->SGlist, sg, dma->SG_length, i) {  in ivtv_udma_fill_sg_array()
68 		dma->SGarray[i].size = cpu_to_le32(sg_dma_len(sg));  in ivtv_udma_fill_sg_array()
69 		dma->SGarray[i].src = cpu_to_le32(sg_dma_address(sg));  in ivtv_udma_fill_sg_array()
70 		dma->SGarray[i].dst = cpu_to_le32(buffer_offset);  in ivtv_udma_fill_sg_array()
79 /* User DMA Buffers */
83 		/* Map DMA Page Array Buffer */  in ivtv_udma_alloc()
96 	struct ivtv_user_dma *dma = &itv->udma;  in ivtv_udma_setup()  local
102 	if (dma->SG_length || dma->page_count) {  in ivtv_udma_setup()
104 			   dma->SG_length, dma->page_count);  in ivtv_udma_setup()
116 	/* Pin user pages for DMA Xfer */  in ivtv_udma_setup()
118 			dma->map, FOLL_FORCE);  in ivtv_udma_setup()
124 			unpin_user_pages(dma->map, err);  in ivtv_udma_setup()
130 	dma->page_count = user_dma.page_count;  in ivtv_udma_setup()
133 	if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) {  in ivtv_udma_setup()
134 		unpin_user_pages(dma->map, dma->page_count);  in ivtv_udma_setup()
135 		dma->page_count = 0;  in ivtv_udma_setup()
140 	dma->SG_length = dma_map_sg(&itv->pdev->dev, dma->SGlist,  in ivtv_udma_setup()
141 				    dma->page_count, DMA_TO_DEVICE);  in ivtv_udma_setup()
144 	ivtv_udma_fill_sg_array (dma, ivtv_dest_addr, 0, -1);  in ivtv_udma_setup()
147 	dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);  in ivtv_udma_setup()
150 	return dma->page_count;  in ivtv_udma_setup()
155 	struct ivtv_user_dma *dma = &itv->udma;  in ivtv_udma_unmap()  local
160 	if (dma->page_count == 0)  in ivtv_udma_unmap()
164 	if (dma->SG_length) {  in ivtv_udma_unmap()
165 		dma_unmap_sg(&itv->pdev->dev, dma->SGlist, dma->page_count,  in ivtv_udma_unmap()
167 		dma->SG_length = 0;  in ivtv_udma_unmap()
169 	/* sync DMA */  in ivtv_udma_unmap()
172 	unpin_user_pages(dma->map, dma->page_count);  in ivtv_udma_unmap()
173 	dma->page_count = 0;  in ivtv_udma_unmap()