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

From: Greg Kroah-Hartman
Date: Mon Feb 13 2017 - 08:23:33 EST

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


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

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@xxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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)