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Subject[PATCH v2 02/12] crypto: atmel-sha: update request queue management to make it more generic
Date
This patch is a transitional patch. It splits the atmel_sha_handle_queue()
function. Now atmel_sha_handle_queue() only manages the request queue and
calls a new .start() hook from the atmel_sha_ctx structure.
This hook allows to implement different kind of requests still handled by
a single queue.

Also when the req parameter of atmel_sha_handle_queue() refers to the very
same request as the one returned by crypto_dequeue_request(), the queue
management now gives a chance to this crypto request to be handled
synchronously, hence reducing latencies. The .start() hook returns 0 if
the crypto request was handled synchronously and -EINPROGRESS if the
crypto request still need to be handled asynchronously.

Besides, the new .is_async member of the atmel_sha_dev structure helps
tagging this asynchronous state. Indeed, the req->base.complete() callback
should not be called if the crypto request is handled synchronously.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/crypto/atmel-sha.c | 74 +++++++++++++++++++++++++++++++++-------------
1 file changed, 54 insertions(+), 20 deletions(-)

diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index 33a36e667547..2dbed8bb8d26 100644
--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -105,8 +105,11 @@ struct atmel_sha_reqctx {
u8 buffer[SHA_BUFFER_LEN + SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
};

+typedef int (*atmel_sha_fn_t)(struct atmel_sha_dev *);
+
struct atmel_sha_ctx {
struct atmel_sha_dev *dd;
+ atmel_sha_fn_t start;

unsigned long flags;
};
@@ -134,6 +137,7 @@ struct atmel_sha_dev {
unsigned long flags;
struct crypto_queue queue;
struct ahash_request *req;
+ bool is_async;

struct atmel_sha_dma dma_lch_in;

@@ -163,6 +167,24 @@ static inline void atmel_sha_write(struct atmel_sha_dev *dd,
writel_relaxed(value, dd->io_base + offset);
}

+static inline int atmel_sha_complete(struct atmel_sha_dev *dd, int err)
+{
+ struct ahash_request *req = dd->req;
+
+ dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
+ SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY);
+
+ clk_disable(dd->iclk);
+
+ if (dd->is_async && req->base.complete)
+ req->base.complete(&req->base, err);
+
+ /* handle new request */
+ tasklet_schedule(&dd->queue_task);
+
+ return err;
+}
+
static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
{
size_t count;
@@ -474,6 +496,8 @@ static void atmel_sha_dma_callback(void *data)
{
struct atmel_sha_dev *dd = data;

+ dd->is_async = true;
+
/* dma_lch_in - completed - wait DATRDY */
atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
}
@@ -509,7 +533,7 @@ static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
}
if (!in_desc)
- return -EINVAL;
+ atmel_sha_complete(dd, -EINVAL);

in_desc->callback = atmel_sha_dma_callback;
in_desc->callback_param = dd;
@@ -566,7 +590,7 @@ static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen +
ctx->block_size);
- return -EINVAL;
+ atmel_sha_complete(dd, -EINVAL);
}

ctx->flags &= ~SHA_FLAGS_SG;
@@ -657,7 +681,7 @@ static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
dev_err(dd->dev, "dma %u bytes error\n",
ctx->buflen + ctx->block_size);
- return -EINVAL;
+ atmel_sha_complete(dd, -EINVAL);
}

if (length == 0) {
@@ -671,7 +695,7 @@ static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
if (!dma_map_sg(dd->dev, ctx->sg, 1,
DMA_TO_DEVICE)) {
dev_err(dd->dev, "dma_map_sg error\n");
- return -EINVAL;
+ atmel_sha_complete(dd, -EINVAL);
}

ctx->flags |= SHA_FLAGS_SG;
@@ -685,7 +709,7 @@ static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)

if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
dev_err(dd->dev, "dma_map_sg error\n");
- return -EINVAL;
+ atmel_sha_complete(dd, -EINVAL);
}

ctx->flags |= SHA_FLAGS_SG;
@@ -843,16 +867,7 @@ static void atmel_sha_finish_req(struct ahash_request *req, int err)
}

/* atomic operation is not needed here */
- dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
- SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY);
-
- clk_disable(dd->iclk);
-
- if (req->base.complete)
- req->base.complete(&req->base, err);
-
- /* handle new request */
- tasklet_schedule(&dd->queue_task);
+ (void)atmel_sha_complete(dd, err);
}

static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
@@ -893,8 +908,9 @@ static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
struct ahash_request *req)
{
struct crypto_async_request *async_req, *backlog;
- struct atmel_sha_reqctx *ctx;
+ struct atmel_sha_ctx *ctx;
unsigned long flags;
+ bool start_async;
int err = 0, ret = 0;

spin_lock_irqsave(&dd->lock, flags);
@@ -919,9 +935,22 @@ static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
if (backlog)
backlog->complete(backlog, -EINPROGRESS);

- req = ahash_request_cast(async_req);
- dd->req = req;
- ctx = ahash_request_ctx(req);
+ ctx = crypto_tfm_ctx(async_req->tfm);
+
+ dd->req = ahash_request_cast(async_req);
+ start_async = (dd->req != req);
+ dd->is_async = start_async;
+
+ /* WARNING: ctx->start() MAY change dd->is_async. */
+ err = ctx->start(dd);
+ return (start_async) ? ret : err;
+}
+
+static int atmel_sha_start(struct atmel_sha_dev *dd)
+{
+ struct ahash_request *req = dd->req;
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ int err;

dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
ctx->op, req->nbytes);
@@ -947,7 +976,7 @@ static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,

dev_dbg(dd->dev, "exit, err: %d\n", err);

- return ret;
+ return err;
}

static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
@@ -1043,8 +1072,11 @@ static int atmel_sha_import(struct ahash_request *req, const void *in)

static int atmel_sha_cra_init(struct crypto_tfm *tfm)
{
+ struct atmel_sha_ctx *ctx = crypto_tfm_ctx(tfm);
+
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
sizeof(struct atmel_sha_reqctx));
+ ctx->start = atmel_sha_start;

return 0;
}
@@ -1188,6 +1220,8 @@ static void atmel_sha_done_task(unsigned long data)
struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
int err = 0;

+ dd->is_async = true;
+
if (SHA_FLAGS_CPU & dd->flags) {
if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
--
2.7.4
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