linux-kernel - [PATCH 4.9 10/60] crypto: ccp - Fix DMA operations when IOMMU is enabled

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Date:   Mon, 13 Feb 2017 05:03:42 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gary R Hook <gary.hook@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.9 10/60] crypto: ccp - Fix DMA operations when IOMMU is enabled

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gary R Hook <gary.hook@....com>

commit 500c0106e638e08c2c661c305ed57d6b67e10908 upstream.

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@....com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/ccp/ccp-dev-v5.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -955,7 +955,7 @@ static irqreturn_t ccp5_irq_handler(int
 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)