crypto: ccp - Fix DMA operations when IOMMU is enabled

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

diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index faf3cb3ddce2303d6ebc2301fc3e62911ccb2b67..a388bf2d67f47ac27d6f4a0f6579f11f71af1457 100644 (file)
--- 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 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)