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From: Md Sadre Alam <quic_mdalam@quicinc.com>
To: thara.gopinath@gmail.com, herbert@gondor.apana.org.au, davem@davemloft.net,
        agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org,
        vkoul@kernel.org, linux-crypto@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        dmaengine@vger.kernel.org, quic_srichara@quicinc.com,
        quic_varada@quicinc.com
Cc: quic_mdalam@quicinc.com
Subject: [PATCH 09/11] crypto: qce - Add support for lock/unlock in skcipher
Date: Thu, 14 Dec 2023 17:12:37 +0530
Message-Id: <20231214114239.2635325-10-quic_mdalam@quicinc.com>
In-Reply-To: <20231214114239.2635325-1-quic_mdalam@quicinc.com>
References: <20231214114239.2635325-1-quic_mdalam@quicinc.com>
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Add support for lock/unlock on bam pipe in skcipher.
If multiple EE's(Execution Environment) try to access
the same crypto engine then before accessing the crypto
engine EE's has to lock the bam pipe and then submit the
request to crypto engine. Once request done then EE's has
to unlock the bam pipe so that others EE's can access the
crypto engine.

Signed-off-by: Md Sadre Alam <quic_mdalam@quicinc.com>
---
 drivers/crypto/qce/skcipher.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index fa7ee5db9aa0..c74df30e8e31 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -42,6 +42,8 @@ static void qce_skcipher_done(void *data)
 	dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
 	dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
 
+	qce_bam_release_lock(qce);
+
 	error = qce_dma_terminate_all(&qce->dma);
 	if (error)
 		dev_dbg(qce->dev, "skcipher dma termination error (%d)\n",
@@ -94,6 +96,8 @@ qce_skcipher_async_req_handle(struct crypto_async_request *async_req)
 	dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
 	dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
 
+	qce_bam_acquire_lock(qce);
+
 	rctx->src_nents = sg_nents_for_len(req->src, req->cryptlen);
 	if (diff_dst)
 		rctx->dst_nents = sg_nents_for_len(req->dst, req->cryptlen);
-- 
2.34.1