linux-kernel - [patch for-5.8 4/4] dma-direct: add missing set_memory

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Message-ID: <alpine.DEB.2.22.394.2006111220010.153880@chino.kir.corp.google.com>
Date:   Thu, 11 Jun 2020 12:20:32 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Christoph Hellwig <hch@....de>
cc:     Thomas Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [patch for-5.8 4/4] dma-direct: add missing set_memory_decrypted()
 for coherent mapping

When a coherent mapping is created in dma_direct_alloc_pages(), it needs
to be decrypted if the device requires unencrypted DMA before returning.

Fixes: 3acac065508f ("dma-mapping: merge the generic remapping helpers
into dma-direct")
Cc: stable@...r.kernel.org # 5.5+
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 kernel/dma/direct.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -195,6 +195,12 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
 				__builtin_return_address(0));
 		if (!ret)
 			goto out_free_pages;
+		if (force_dma_unencrypted(dev)) {
+			err = set_memory_decrypted((unsigned long)ret,
+						   1 << get_order(size));
+			if (err)
+				goto out_free_pages;
+		}
 		memset(ret, 0, size);
 		goto done;
 	}