drivers/crypto/marvell/cesa/cipher.c

Source file repositories/reference/linux-study-clean/drivers/crypto/marvell/cesa/cipher.c

File Facts

System
Linux kernel
Corpus path
drivers/crypto/marvell/cesa/cipher.c
Extension
.c
Size
21869 bytes
Lines
823
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

struct mv_cesa_des_ctx {
	struct mv_cesa_ctx base;
	u8 key[DES_KEY_SIZE];
};

struct mv_cesa_des3_ctx {
	struct mv_cesa_ctx base;
	u8 key[DES3_EDE_KEY_SIZE];
};

struct mv_cesa_aes_ctx {
	struct mv_cesa_ctx base;
	struct crypto_aes_ctx aes;
};

struct mv_cesa_skcipher_dma_iter {
	struct mv_cesa_dma_iter base;
	struct mv_cesa_sg_dma_iter src;
	struct mv_cesa_sg_dma_iter dst;
};

static inline void
mv_cesa_skcipher_req_iter_init(struct mv_cesa_skcipher_dma_iter *iter,
			       struct skcipher_request *req)
{
	mv_cesa_req_dma_iter_init(&iter->base, req->cryptlen);
	mv_cesa_sg_dma_iter_init(&iter->src, req->src, DMA_TO_DEVICE);
	mv_cesa_sg_dma_iter_init(&iter->dst, req->dst, DMA_FROM_DEVICE);
}

static inline bool
mv_cesa_skcipher_req_iter_next_op(struct mv_cesa_skcipher_dma_iter *iter)
{
	iter->src.op_offset = 0;
	iter->dst.op_offset = 0;

	return mv_cesa_req_dma_iter_next_op(&iter->base);
}

static inline void
mv_cesa_skcipher_dma_cleanup(struct skcipher_request *req)
{
	struct mv_cesa_skcipher_req *creq = skcipher_request_ctx(req);

	if (req->dst != req->src) {
		dma_unmap_sg(cesa_dev->dev, req->dst, creq->dst_nents,
			     DMA_FROM_DEVICE);
		dma_unmap_sg(cesa_dev->dev, req->src, creq->src_nents,
			     DMA_TO_DEVICE);
	} else {
		dma_unmap_sg(cesa_dev->dev, req->src, creq->src_nents,
			     DMA_BIDIRECTIONAL);
	}
	mv_cesa_dma_cleanup(&creq->base);
}

static inline void mv_cesa_skcipher_cleanup(struct skcipher_request *req)
{
	struct mv_cesa_skcipher_req *creq = skcipher_request_ctx(req);
	struct mv_cesa_engine *engine = creq->base.engine;

	if (mv_cesa_req_get_type(&creq->base) == CESA_DMA_REQ)
		mv_cesa_skcipher_dma_cleanup(req);

	atomic_sub(req->cryptlen, &engine->load);
}

static void mv_cesa_skcipher_std_step(struct skcipher_request *req)
{
	struct mv_cesa_skcipher_req *creq = skcipher_request_ctx(req);
	struct mv_cesa_skcipher_std_req *sreq = &creq->std;
	struct mv_cesa_engine *engine = creq->base.engine;
	size_t  len = min_t(size_t, req->cryptlen - sreq->offset,
			    CESA_SA_SRAM_PAYLOAD_SIZE);

	mv_cesa_adjust_op(engine, &sreq->op);
	if (engine->pool)
		memcpy(engine->sram_pool, &sreq->op, sizeof(sreq->op));
	else
		memcpy_toio(engine->sram, &sreq->op, sizeof(sreq->op));

	len = mv_cesa_sg_copy_to_sram(engine, req->src, creq->src_nents,
				      CESA_SA_DATA_SRAM_OFFSET, len,
				      sreq->offset);

	sreq->size = len;
	mv_cesa_set_crypt_op_len(&sreq->op, len);

	/* FIXME: only update enc_len field */
	if (!sreq->skip_ctx) {

Annotation

Implementation Notes