From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.fireflyinternet.com ([87.106.93.118]:62111 "EHLO fireflyinternet.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751223AbbKQKv4 (ORCPT ); Tue, 17 Nov 2015 05:51:56 -0500 Date: Tue, 17 Nov 2015 10:51:52 +0000 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Cc: Matti =?iso-8859-1?Q?H=E4m=E4l=E4inen?= , stable@vger.kernel.org Subject: Re: [PATCH 1/2] drm/i915: Mark uneven memory banks on gen4 desktop as unknown swizzling Message-ID: <20151117105152.GX569@nuc-i3427.alporthouse.com> References: <1447756852-15183-1-git-send-email-chris@chris-wilson.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1447756852-15183-1-git-send-email-chris@chris-wilson.co.uk> Sender: stable-owner@vger.kernel.org List-ID: On Tue, Nov 17, 2015 at 10:40:51AM +0000, Chris Wilson wrote: > We have varied reports of swizzling corruption on gen4 desktop, and > confirmation that it is triggered by uneven memory banks. The s/it/one at least/ > implication is that the swizzling various between the paired channels s/various/varies/ > and the remainder of memory on the single channel. As the object then > has unpredictable swizzling (it will vary depending on exact page > allocation and may even change during the object's lifetime as the pages > are replaced), we have to report to userspace that the swizzling is > unknown. -- Chris Wilson, Intel Open Source Technology Centre