Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753074AbaFXKdR (ORCPT ); Tue, 24 Jun 2014 06:33:17 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:12570 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751713AbaFXKdQ convert rfc822-to-8bit (ORCPT ); Tue, 24 Jun 2014 06:33:16 -0400 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Tue, 24 Jun 2014 03:23:29 -0700 Message-ID: <53A953E6.2030503@nvidia.com> Date: Tue, 24 Jun 2014 19:33:10 +0900 From: Alexandre Courbot Organization: NVIDIA User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Russell King - ARM Linux CC: David Airlie , Ben Skeggs , Lucas Stach , Thierry Reding , "gnurou@gmail.com" , "nouveau@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , "linux-tegra@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v2 2/3] drm/ttm: introduce dma cache sync helpers References: <1403603667-11302-1-git-send-email-acourbot@nvidia.com> <1403603667-11302-3-git-send-email-acourbot@nvidia.com> <20140624100220.GK32514@n2100.arm.linux.org.uk> In-Reply-To: <20140624100220.GK32514@n2100.arm.linux.org.uk> X-NVConfidentiality: public Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/24/2014 07:02 PM, Russell King - ARM Linux wrote: > On Tue, Jun 24, 2014 at 06:54:26PM +0900, Alexandre Courbot wrote: >> From: Lucas Stach >> >> On architectures for which access to GPU memory is non-coherent, >> caches need to be flushed and invalidated explicitly at the >> appropriate places. Introduce two small helpers to make things >> easy for TTM-based drivers. > > Have you run this with DMA API debugging enabled? I suspect you haven't, > and I recommend that you do. # cat /sys/kernel/debug/dma-api/error_count 162621 (╯°□°）╯︵ ┻━┻) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/