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From: Gary R Hook <gary.hook@amd.com>
To: <linux-crypto@vger.kernel.org>
Cc: <thomas.lendacky@amd.com>, <herbert@gondor.apana.org.au>,
	<davem@davemloft.net>
Subject: [PATCH] crypto: ccp: Fix DMA operations when IOMMU is enabled
Date: Fri, 27 Jan 2017 15:28:45 -0600	[thread overview]
Message-ID: <20170127212845.27618.32169.stgit@taos> (raw)

An I/O page fault occurs when the IOMMU is enabled on a
system that supports the v5 CCP.  DMA operations use a
Request ID value that does not match what is expected by
the IOMMU, resulting in the I/O page fault.  Setting the
Request ID value to 0 corrects this issue.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 drivers/crypto/ccp/ccp-dev-v5.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index e2ce819..612898b 100644
--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -959,7 +959,7 @@ static irqreturn_t ccp5_irq_handler(int irq, void *data)
 static void ccp5_config(struct ccp_device *ccp)
 {
 	/* Public side */
-	iowrite32(0x00001249, ccp->io_regs + CMD5_REQID_CONFIG_OFFSET);
+	iowrite32(0x0, ccp->io_regs + CMD5_REQID_CONFIG_OFFSET);
 }
 
 static void ccp5other_config(struct ccp_device *ccp)

             reply	other threads:[~2017-01-27 21:28 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-27 21:28 Gary R Hook [this message]
2017-02-02 17:14 ` Gary R Hook
2017-02-03 10:21 ` Herbert Xu

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