From: Gary R Hook Subject: [PATCH] crypto: ccp: Fix DMA operations when IOMMU is enabled Date: Fri, 27 Jan 2017 15:28:45 -0600 Message-ID: <20170127212845.27618.32169.stgit@taos> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: , , To: Return-path: Received: from mail-sn1nam02on0084.outbound.protection.outlook.com ([104.47.36.84]:33048 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751258AbdA0V25 (ORCPT ); Fri, 27 Jan 2017 16:28:57 -0500 Sender: linux-crypto-owner@vger.kernel.org List-ID: 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 --- 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)