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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 5EEC7C2D0A8 for ; Tue, 8 Sep 2020 14:23:57 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0532222A83 for ; Tue, 8 Sep 2020 14:23:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="g4rWFwqP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0532222A83 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C52126E841; Tue, 8 Sep 2020 14:23:55 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5F97D88E41 for ; Mon, 7 Sep 2020 07:00:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=mOwuNgBR5sDIJB+BvLt/e/G3W0U4pZcy6kQxubHpOsc=; b=g4rWFwqPV1Go6Awo3Xadh/+FTc rhkqVOirmN3euJ0YqlVMZuHmarTPW9k/+KBS0IBJiq7PF6T/kKmi+Jfc3KrgtB827pIK6HWC/Mdht 5xhoUhE0TgTLAd6RWIpqSgFwrqFKpVC7zMd2tCVTTzzCpWaSypFoADb7e9sp/QltHPE07bTrXlPCo jJpbTL7D5CEklu82hlfFs0pIt6EB91s9Pmo7ouUpJXku2JCl7cHofEBhAXLGEdBYyHfDd6vouz/NI JFp7LEB0sCZpyV49c8FZmuTBa8B14Fk7K9ICTPjCb0tLjN2FnTVYTfg2bFkUBB72NcK8nFsDXX9cL 9fzmjARw==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kFB8l-0006fv-7r; Mon, 07 Sep 2020 07:00:35 +0000 Date: Mon, 7 Sep 2020 08:00:35 +0100 From: Christoph Hellwig To: Tom Murphy Message-ID: <20200907070035.GA25114@infradead.org> References: <20200903201839.7327-1-murphyt7@tcd.ie> <20200903201839.7327-6-murphyt7@tcd.ie> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200903201839.7327-6-murphyt7@tcd.ie> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Mailman-Approved-At: Tue, 08 Sep 2020 14:23:54 +0000 Subject: Re: [Intel-gfx] [PATCH V2 5/5] DO NOT MERGE: iommu: disable list appending in dma-iommu X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, David Woodhouse Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, Sep 03, 2020 at 09:18:37PM +0100, Tom Murphy wrote: > Disable combining sg segments in the dma-iommu api. > Combining the sg segments exposes a bug in the intel i915 driver which > causes visual artifacts and the screen to freeze. This is most likely > because of how the i915 handles the returned list. It probably doesn't > respect the returned value specifying the number of elements in the list > and instead depends on the previous behaviour of the intel iommu driver > which would return the same number of elements in the output list as in > the input list. So what is the state of addressing this properly in i915? IF we can't get it done ASAP I wonder if we need a runtime quirk to disable merging instead of blocking this conversion.. _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx