Commit 281c3778 authored by Tero Kristo's avatar Tero Kristo Committed by Herbert Xu
Browse files

crypto: omap-sham - add proper load balancing support for multicore 



The current implementation of the multiple accelerator core support for
OMAP SHA does not work properly. It always picks up the first probed
accelerator core if this is available, and rest of the book keeping also
gets confused if there are two cores available. Add proper load
balancing support for SHA, and also fix any bugs related to the
multicore support while doing it.

Signed-off-by: default avatarTero Kristo <t-kristo@ti.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 9ef4e6e5

drivers/crypto/omap-sham.c

+31 −33
Original line number Diff line number Diff line
@@ -168,8 +168,6 @@ struct omap_sham_hmac_ctx { 
};



struct omap_sham_ctx {

	struct omap_sham_dev	*dd;



	unsigned long		flags;



	/* fallback stuff */
@@ -934,27 +932,35 @@ static int omap_sham_update_dma_stop(struct omap_sham_dev *dd) 
	return 0;

}



struct omap_sham_dev *omap_sham_find_dev(struct omap_sham_reqctx *ctx)

{

	struct omap_sham_dev *dd;



	if (ctx->dd)

		return ctx->dd;



	spin_lock_bh(&sham.lock);

	dd = list_first_entry(&sham.dev_list, struct omap_sham_dev, list);

	list_move_tail(&dd->list, &sham.dev_list);

	ctx->dd = dd;

	spin_unlock_bh(&sham.lock);



	return dd;

}



static int omap_sham_init(struct ahash_request *req)

{

	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);

	struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);

	struct omap_sham_reqctx *ctx = ahash_request_ctx(req);

	struct omap_sham_dev *dd = NULL, *tmp;

	struct omap_sham_dev *dd;

	int bs = 0;



	spin_lock_bh(&sham.lock);

	if (!tctx->dd) {

		list_for_each_entry(tmp, &sham.dev_list, list) {

			dd = tmp;

			break;

		}

		tctx->dd = dd;

	} else {

		dd = tctx->dd;

	}

	spin_unlock_bh(&sham.lock);

	ctx->dd = NULL;



	ctx->dd = dd;

	dd = omap_sham_find_dev(ctx);

	if (!dd)

		return -ENODEV;



	ctx->flags = 0;
@@ -1224,8 +1230,7 @@ err1: 
static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(req);

	struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);

	struct omap_sham_dev *dd = tctx->dd;

	struct omap_sham_dev *dd = ctx->dd;



	ctx->op = op;
@@ -1235,7 +1240,7 @@ static int omap_sham_enqueue(struct ahash_request *req, unsigned int op) 
static int omap_sham_update(struct ahash_request *req)

{

	struct omap_sham_reqctx *ctx = ahash_request_ctx(req);

	struct omap_sham_dev *dd = ctx->dd;

	struct omap_sham_dev *dd = omap_sham_find_dev(ctx);



	if (!req->nbytes)

		return 0;
@@ -1328,21 +1333,8 @@ static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key, 
	struct omap_sham_hmac_ctx *bctx = tctx->base;

	int bs = crypto_shash_blocksize(bctx->shash);

	int ds = crypto_shash_digestsize(bctx->shash);

	struct omap_sham_dev *dd = NULL, *tmp;

	int err, i;



	spin_lock_bh(&sham.lock);

	if (!tctx->dd) {

		list_for_each_entry(tmp, &sham.dev_list, list) {

			dd = tmp;

			break;

		}

		tctx->dd = dd;

	} else {

		dd = tctx->dd;

	}

	spin_unlock_bh(&sham.lock);



	err = crypto_shash_setkey(tctx->fallback, key, keylen);

	if (err)

		return err;
@@ -1359,7 +1351,7 @@ static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key, 


	memset(bctx->ipad + keylen, 0, bs - keylen);



	if (!test_bit(FLAGS_AUTO_XOR, &dd->flags)) {

	if (!test_bit(FLAGS_AUTO_XOR, &sham.flags)) {

		memcpy(bctx->opad, bctx->ipad, bs);



		for (i = 0; i < bs; i++) {
@@ -2171,6 +2163,7 @@ static int omap_sham_probe(struct platform_device *pdev) 
	}



	dd->flags |= dd->pdata->flags;

	sham.flags |= dd->pdata->flags;



	pm_runtime_use_autosuspend(dev);

	pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
@@ -2198,6 +2191,9 @@ static int omap_sham_probe(struct platform_device *pdev) 
	spin_unlock(&sham.lock);



	for (i = 0; i < dd->pdata->algs_info_size; i++) {

		if (dd->pdata->algs_info[i].registered)

			break;



		for (j = 0; j < dd->pdata->algs_info[i].size; j++) {

			struct ahash_alg *alg;
@@ -2249,9 +2245,11 @@ static int omap_sham_remove(struct platform_device *pdev) 
	list_del(&dd->list);

	spin_unlock(&sham.lock);

	for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)

		for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)

		for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) {

			crypto_unregister_ahash(

					&dd->pdata->algs_info[i].algs_list[j]);

			dd->pdata->algs_info[i].registered--;

		}

	tasklet_kill(&dd->done_task);

	pm_runtime_disable(&pdev->dev);

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