From patchwork Tue Jan 15 13:22:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joerg Roedel X-Patchwork-Id: 10764467 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 989D3139A for ; Tue, 15 Jan 2019 13:23:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 82C5B2C084 for ; Tue, 15 Jan 2019 13:23:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 72C852C0B0; Tue, 15 Jan 2019 13:23:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 02CC62C084 for ; Tue, 15 Jan 2019 13:23:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729672AbfAONXI (ORCPT ); Tue, 15 Jan 2019 08:23:08 -0500 Received: from 8bytes.org ([81.169.241.247]:57736 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727626AbfAONXC (ORCPT ); Tue, 15 Jan 2019 08:23:02 -0500 Received: by theia.8bytes.org (Postfix, from userid 1000) id 3CF402AF; Tue, 15 Jan 2019 14:23:00 +0100 (CET) From: Joerg Roedel To: "Michael S . Tsirkin" , Jason Wang , Konrad Rzeszutek Wilk , Christoph Hellwig Cc: Jens Axboe , virtualization@lists.linux-foundation.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jfehlig@suse.com, jon.grimm@amd.com, brijesh.singh@amd.com, joro@8bytes.org, jroedel@suse.de Subject: [PATCH 0/3 v2] Fix virtio-blk issue with SWIOTLB Date: Tue, 15 Jan 2019 14:22:54 +0100 Message-Id: <20190115132257.6426-1-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi, here is the second version of my patch-set to fix a DMA mapping size issue triggered by the virtio-blk driver. The problem is a limitation of the SWIOTLB implementation, which does not support allocations larger than 256kb. When the virtio-blk driver tries to read/write a block larger than that, the allocation of the dma-handle fails and an IO error is reported. v1 of the patch-set can be found here: https://lore.kernel.org/lkml/20190110134433.15672-1-joro@8bytes.org/ The change to v1 is that the maximum mapping size is now officially propagated through the DMA-API, as suggested by Christoph Hellwig. Please review. Thanks, Joerg Joerg Roedel (3): swiotlb: Introduce swiotlb_max_mapping_size() dma: Introduce dma_max_mapping_size() virtio-blk: Consider dma_max_mapping_size() for maximum segment size drivers/block/virtio_blk.c | 10 ++++++---- include/linux/dma-mapping.h | 16 ++++++++++++++++ include/linux/swiotlb.h | 5 +++++ kernel/dma/direct.c | 10 ++++++++++ kernel/dma/swiotlb.c | 5 +++++ 5 files changed, 42 insertions(+), 4 deletions(-)