Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752350AbaJ0Jtk (ORCPT ); Mon, 27 Oct 2014 05:49:40 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:3013 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752289AbaJ0Jtf (ORCPT ); Mon, 27 Oct 2014 05:49:35 -0400 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Mon, 27 Oct 2014 02:48:56 -0700 From: Alexandre Courbot To: Ben Skeggs , David Airlie , David Herrmann , Lucas Stach , Thierry Reding , Maarten Lankhorst CC: , , , , , Alexandre Courbot Subject: [PATCH v5 1/4] drm: introduce nv_device_is_cpu_coherent() Date: Mon, 27 Oct 2014 18:49:16 +0900 Message-ID: <1414403359-22332-2-git-send-email-acourbot@nvidia.com> X-Mailer: git-send-email 2.1.2 In-Reply-To: <1414403359-22332-1-git-send-email-acourbot@nvidia.com> References: <1414403359-22332-1-git-send-email-acourbot@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a function allowing us to know whether a device is CPU-coherent, i.e. accesses performed by the CPU on GPU-mapped buffers will be immediately visible on the GPU side and vice-versa. For now, a device is considered to be coherent if it uses the PCI bus on a non-ARM architecture. Signed-off-by: Alexandre Courbot --- lib/core/os.h | 2 ++ nvkm/include/core/device.h | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/lib/core/os.h b/lib/core/os.h index fba9542292ac..79462eb2cfd4 100644 --- a/lib/core/os.h +++ b/lib/core/os.h @@ -101,6 +101,8 @@ typedef dma_addr_t resource_size_t; #define __printf(a,b) #define __user +#define IS_ENABLED(x) (0) + static inline int order_base_2(u64 base) { diff --git a/nvkm/include/core/device.h b/nvkm/include/core/device.h index 1d9d893929bb..0d839e1ddaf4 100644 --- a/nvkm/include/core/device.h +++ b/nvkm/include/core/device.h @@ -158,6 +158,12 @@ nv_device_is_pci(struct nouveau_device *device) return device->pdev != NULL; } +static inline bool +nv_device_is_cpu_coherent(struct nouveau_device *device) +{ + return (!IS_ENABLED(CONFIG_ARM) && nv_device_is_pci(device)); +} + static inline struct device * nv_device_base(struct nouveau_device *device) { -- 2.1.2 -- 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/