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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 A4E19C433FF for ; Thu, 8 Aug 2019 15:35:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7A7942184E for ; Thu, 8 Aug 2019 15:35:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403968AbfHHPfC (ORCPT ); Thu, 8 Aug 2019 11:35:02 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35876 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732549AbfHHPfC (ORCPT ); Thu, 8 Aug 2019 11:35:02 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D92C560171; Thu, 8 Aug 2019 15:35:01 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-144.ams2.redhat.com [10.36.116.144]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2F4A1600C8; Thu, 8 Aug 2019 15:34:59 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 341EB16E08; Thu, 8 Aug 2019 17:34:58 +0200 (CEST) From: Gerd Hoffmann To: dri-devel@lists.freedesktop.org Cc: Gerd Hoffmann , David Airlie , Daniel Vetter , virtualization@lists.linux-foundation.org (open list:VIRTIO GPU DRIVER), linux-kernel@vger.kernel.org (open list) Subject: [PATCH] drm/virtio: use virtio_max_dma_size Date: Thu, 8 Aug 2019 17:34:45 +0200 Message-Id: <20190808153445.27177-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Thu, 08 Aug 2019 15:35:01 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We must make sure our scatterlist segments are not too big, otherwise we might see swiotlb failures (happens with sev, also reproducable with swiotlb=force). Signed-off-by: Gerd Hoffmann --- drivers/gpu/drm/virtio/virtgpu_object.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c index b2da31310d24..6e44568813dd 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -204,6 +204,7 @@ int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev, .interruptible = false, .no_wait_gpu = false }; + unsigned max_segment; /* wtf swapping */ if (bo->pages) @@ -215,8 +216,13 @@ int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev, if (!bo->pages) goto out; - ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0, - nr_pages << PAGE_SHIFT, GFP_KERNEL); + max_segment = virtio_max_dma_size(qdev->vdev); + max_segment &= ~(size_t)(PAGE_SIZE - 1); + if (max_segment > SCATTERLIST_MAX_SEGMENT) + max_segment = SCATTERLIST_MAX_SEGMENT; + ret = __sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0, + nr_pages << PAGE_SHIFT, + max_segment, GFP_KERNEL); if (ret) goto out; return 0; -- 2.18.1