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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,UNPARSEABLE_RELAY 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 2F3D2C4321E for ; Mon, 10 Sep 2018 16:27:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CF17220865 for ; Mon, 10 Sep 2018 16:26:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CF17220865 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728466AbeIJVVt (ORCPT ); Mon, 10 Sep 2018 17:21:49 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:58508 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727777AbeIJVVt (ORCPT ); Mon, 10 Sep 2018 17:21:49 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: gerddie) with ESMTPSA id ED1F2263BAC Message-ID: <1536596762.5451.4.camel@collabora.com> Subject: Re: [PATCH v7] Add udmabuf misc device From: Gert Wollny To: Gerd Hoffmann Cc: linux-kernel@vger.kernel.org, David Airlie , Tomeu Vizoso , Laurent Pinchart , Daniel Vetter Date: Mon, 10 Sep 2018 18:26:02 +0200 In-Reply-To: <20180910133050.tr2lozfmhimqs4c4@sirius.home.kraxel.org> References: <1536491489.4810.22.camel@collabora.com> <20180910083731.o4rryvermyighbtp@sirius.home.kraxel.org> <1536571118.4810.38.camel@collabora.com> <20180910105309.zmyoo5yhrmqg47md@sirius.home.kraxel.org> <1536579068.4810.68.camel@collabora.com> <20180910133050.tr2lozfmhimqs4c4@sirius.home.kraxel.org> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.24.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Montag, den 10.09.2018, 15:30 +0200 schrieb Gerd Hoffmann: > On Mon, Sep 10, 2018 at 01:31:08PM +0200, Gert Wollny wrote: > > Am Montag, den 10.09.2018, 12:53 +0200 schrieb Gerd Hoffmann: > > > > > > By default qemu doesn't use memfd for backing storage, you have > > > to > > > explicitly configure qemu that way (see qemu commit log of the > > > test > > > branch): > > > > > > qemu-system-x86_64 -m 2G > > > -object memory-backend-memfd,id=ram,size=2G > > > -numa node,memdev=ram" > > > > Thanks, but that doesn't seem to help. > With some more debugging I found WARNING: CPU: 2 PID: 14658 at drivers/dma-buf/dma-buf.c:410 dma_buf_export+0x85/0x270 which refers to dma_buf_export:414 if (WARN_ON(!exp_info->priv || !exp_info->ops || !exp_info->ops->map_dma_buf || !exp_info->ops->unmap_dma_buf || !exp_info->ops->release || !exp_info->ops->map_atomic || !exp_info->ops->map || !exp_info->ops->mmap)) { return ERR_PTR(-EINVAL); } Specifically, map_atomic is NULL, but as I can see from the git version, this was removed some time ago, going to test the 4.19 rc2 kernel now, Best, Gert