From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B65FC43381 for ; Mon, 18 Feb 2019 06:46:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 33761218C3 for ; Mon, 18 Feb 2019 06:46:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728557AbfBRGqy (ORCPT ); Mon, 18 Feb 2019 01:46:54 -0500 Received: from host-88-217-225-28.customer.m-online.net ([88.217.225.28]:29120 "EHLO mail.dev.tdt.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725836AbfBRGqx (ORCPT ); Mon, 18 Feb 2019 01:46:53 -0500 X-Greylist: delayed 552 seconds by postgrey-1.27 at vger.kernel.org; Mon, 18 Feb 2019 01:46:53 EST Received: from localhost.localdomain (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id 69723204C2; Mon, 18 Feb 2019 06:37:39 +0000 (UTC) From: Martin Schiller To: hminas@synopsys.com, gregkh@linuxfoundation.org, felipe.balbi@linux.intel.com, a.seppala@gmail.com, dianders@chromium.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Schiller Subject: [PATCH] usb: dwc2: Fix DMA cache alignment issues Date: Mon, 18 Feb 2019 07:37:30 +0100 Message-Id: <20190218063730.26870-1-ms@dev.tdt.de> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Insert a padding between data and the stored_xfer_buffer pointer to ensure they are not on the same cache line. Otherwise, the stored_xfer_buffer gets corrupted for IN URBs on non-cache-coherent systems. (In my case: Lantiq xRX200 MIPS) Fixes: 3bc04e28a030 ("usb: dwc2: host: Get aligned DMA in a more supported way") Fixes: 56406e017a88 ("usb: dwc2: Fix DMA alignment to start at allocated boundary") Signed-off-by: Martin Schiller --- drivers/usb/dwc2/hcd.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index dd82fa516f3f..f3035dd4db25 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -2664,8 +2664,10 @@ static void dwc2_free_dma_aligned_buffer(struct urb *urb) return; /* Restore urb->transfer_buffer from the end of the allocated area */ - memcpy(&stored_xfer_buffer, urb->transfer_buffer + - urb->transfer_buffer_length, sizeof(urb->transfer_buffer)); + memcpy(&stored_xfer_buffer, + PTR_ALIGN(urb->transfer_buffer + urb->transfer_buffer_length, + dma_get_cache_alignment()), + sizeof(urb->transfer_buffer)); if (usb_urb_dir_in(urb)) { if (usb_pipeisoc(urb->pipe)) @@ -2697,6 +2699,7 @@ static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) * DMA */ kmalloc_size = urb->transfer_buffer_length + + (dma_get_cache_alignment() - 1) + sizeof(urb->transfer_buffer); kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); @@ -2707,7 +2710,8 @@ static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) * Position value of original urb->transfer_buffer pointer to the end * of allocation for later referencing */ - memcpy(kmalloc_ptr + urb->transfer_buffer_length, + memcpy(PTR_ALIGN(kmalloc_ptr + urb->transfer_buffer_length, + dma_get_cache_alignment()), &urb->transfer_buffer, sizeof(urb->transfer_buffer)); if (usb_urb_dir_out(urb)) -- 2.11.0