Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932346AbdC1Uzu (ORCPT ); Tue, 28 Mar 2017 16:55:50 -0400 Received: from mx2.suse.de ([195.135.220.15]:58388 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752937AbdC1Uzt (ORCPT ); Tue, 28 Mar 2017 16:55:49 -0400 Date: Tue, 28 Mar 2017 22:56:16 +0200 From: "'Joerg Roedel'" To: "Deucher, Alexander" Cc: "'Joerg Roedel'" , Bjorn Helgaas , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Daniel Drake , "Nath, Arindam" Subject: Re: [PATCH] PCI: Blacklist AMD Stoney GPU devices for ATS Message-ID: <20170328205616.GR8329@suse.de> References: <1490703404-4944-1-git-send-email-joro@8bytes.org> <20170328202844.GQ8329@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 416 Lines: 12 On Tue, Mar 28, 2017 at 08:37:01PM +0000, Deucher, Alexander wrote: > The question is, could the problem stem from flushing an entity that > didn't request it, or should that not matter? I guess it shouldn't > matter otherwise we'd see this on other platforms like Carrizo as > well. What do you mean by "didn't request it"? The IOMMU driver only sends io/tlb invalidations to devices it enabled ATS on. Joerg