linux-kernel - [PATCH v2] crypto: octeontx2 - Use dma_alloc_noncoherent() instead of kzalloc/dma_map

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Date:   Tue, 12 Oct 2021 11:22:28 +0800
From:   Cai Huoqing <caihuoqing@...du.com>
To:     <hch@...radead.org>
CC:     Cai Huoqing <caihuoqing@...du.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Arnaud Ebalard <arno@...isbad.org>,
        Srujana Challa <schalla@...vell.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] crypto: octeontx2 - Use dma_alloc_noncoherent() instead of kzalloc/dma_map_single()

Replacing kzalloc/kfree/dma_map_single/dma_unmap_single()
with dma_alloc_noncoherent/dma_free_noncoherent() helps to
reduce code size, and simplify the code, and the hardware
can keep DMA coherent itself.

Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
---
v1->v2:
	*Change to dma_alloc/free_noncoherent from dma_alloc/free_coherent.
	*Update changelog.

 drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c b/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c
index dff34b3ec09e..f023a02ee2b5 100644
--- a/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c
+++ b/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c
@@ -1449,18 +1449,11 @@ int otx2_cpt_discover_eng_capabilities(struct otx2_cptpf_dev *cptpf)
 	compl_rlen = ALIGN(sizeof(union otx2_cpt_res_s), OTX2_CPT_DMA_MINALIGN);
 	len = compl_rlen + LOADFVC_RLEN;
 
-	result = kzalloc(len, GFP_KERNEL);
+	result = dma_alloc_noncoherent(&pdev->dev, len, &rptr_baddr, DMA_BIDIRECTIONAL, GFP_KERNEL);
 	if (!result) {
 		ret = -ENOMEM;
 		goto lf_cleanup;
 	}
-	rptr_baddr = dma_map_single(&pdev->dev, (void *)result, len,
-				    DMA_BIDIRECTIONAL);
-	if (dma_mapping_error(&pdev->dev, rptr_baddr)) {
-		dev_err(&pdev->dev, "DMA mapping failed\n");
-		ret = -EFAULT;
-		goto free_result;
-	}
 	rptr = (u8 *)result + compl_rlen;
 
 	/* Fill in the command */
@@ -1489,11 +1482,9 @@ int otx2_cpt_discover_eng_capabilities(struct otx2_cptpf_dev *cptpf)
 
 		cptpf->eng_caps[etype].u = be64_to_cpup(rptr);
 	}
-	dma_unmap_single(&pdev->dev, rptr_baddr, len, DMA_BIDIRECTIONAL);
+	dma_free_noncoherent(&pdev->dev, len, (void *)result, rptr_baddr, DMA_BIDIRECTIONAL);
 	cptpf->is_eng_caps_discovered = true;
 
-free_result:
-	kfree(result);
 lf_cleanup:
 	otx2_cptlf_shutdown(&cptpf->lfs);
 delete_grps:
-- 
2.25.1