drivers/crypto/amlogic/amlogic-gxl-cipher.c

Source file repositories/reference/linux-study-clean/drivers/crypto/amlogic/amlogic-gxl-cipher.c

File Facts

System
Linux kernel
Corpus path
drivers/crypto/amlogic/amlogic-gxl-cipher.c
Extension
.c
Size
10226 bytes
Lines
372
Domain
Driver Families
Bucket
drivers/crypto
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ivsize > areq->cryptlen) {
			dev_err(mc->dev, "invalid ivsize=%d vs len=%d\n", ivsize, areq->cryptlen);
			err = -EINVAL;
			goto theend;
		}
		memcpy(bkeyiv + 32, areq->iv, ivsize);
		keyivlen = 48;
		if (rctx->op_dir == MESON_DECRYPT) {
			backup_iv = kzalloc(ivsize, GFP_KERNEL);
			if (!backup_iv) {
				err = -ENOMEM;
				goto theend;
			}
			offset = areq->cryptlen - ivsize;
			scatterwalk_map_and_copy(backup_iv, areq->src, offset,
						 ivsize, 0);
		}
	}
	if (keyivlen == 24)
		keyivlen = 32;

	phykeyiv = dma_map_single(mc->dev, bkeyiv, keyivlen,
				  DMA_TO_DEVICE);
	err = dma_mapping_error(mc->dev, phykeyiv);
	if (err) {
		dev_err(mc->dev, "Cannot DMA MAP KEY IV\n");
		goto theend;
	}

	tloffset = 0;
	eat = 0;
	i = 0;
	while (keyivlen > eat) {
		desc = &mc->chanlist[flow].tl[tloffset];
		memset(desc, 0, sizeof(struct meson_desc));
		todo = min(keyivlen - eat, 16u);
		desc->t_src = cpu_to_le32(phykeyiv + i * 16);
		desc->t_dst = cpu_to_le32(i * 16);
		v = (MODE_KEY << 20) | DESC_OWN | 16;
		desc->t_status = cpu_to_le32(v);

		eat += todo;
		i++;
		tloffset++;
	}

	if (areq->src == areq->dst) {
		nr_sgs = dma_map_sg(mc->dev, areq->src, sg_nents(areq->src),
				    DMA_BIDIRECTIONAL);
		if (!nr_sgs) {
			dev_err(mc->dev, "Invalid SG count %d\n", nr_sgs);
			err = -EINVAL;
			goto theend;
		}
		nr_sgd = nr_sgs;
	} else {
		nr_sgs = dma_map_sg(mc->dev, areq->src, sg_nents(areq->src),
				    DMA_TO_DEVICE);
		if (!nr_sgs || nr_sgs > MAXDESC - 3) {
			dev_err(mc->dev, "Invalid SG count %d\n", nr_sgs);
			err = -EINVAL;
			goto theend;
		}
		nr_sgd = dma_map_sg(mc->dev, areq->dst, sg_nents(areq->dst),
				    DMA_FROM_DEVICE);
		if (!nr_sgd || nr_sgd > MAXDESC - 3) {
			dev_err(mc->dev, "Invalid SG count %d\n", nr_sgd);
			err = -EINVAL;
			goto theend;
		}
	}

	src_sg = areq->src;
	dst_sg = areq->dst;
	len = areq->cryptlen;
	while (src_sg) {
		desc = &mc->chanlist[flow].tl[tloffset];
		memset(desc, 0, sizeof(struct meson_desc));

		desc->t_src = cpu_to_le32(sg_dma_address(src_sg));
		desc->t_dst = cpu_to_le32(sg_dma_address(dst_sg));
		todo = min(len, sg_dma_len(src_sg));
		v = (op->keymode << 20) | DESC_OWN | todo | (algt->blockmode << 26);
		if (rctx->op_dir)
			v |= DESC_ENCRYPTION;
		len -= todo;

		if (!sg_next(src_sg))
			v |= DESC_LAST;
		desc->t_status = cpu_to_le32(v);

Annotation

Implementation Notes