From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754644Ab1KFTRI (ORCPT ); Sun, 6 Nov 2011 14:17:08 -0500 Received: from mail-wy0-f174.google.com ([74.125.82.174]:62521 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754553Ab1KFTPc (ORCPT ); Sun, 6 Nov 2011 14:15:32 -0500 From: Daniel Vetter To: intel-gfx Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Daniel Vetter Subject: [PATCH 06/13] drm: add helper to clflush a virtual address range Date: Sun, 6 Nov 2011 20:13:53 +0100 Message-Id: <1320606840-21132-7-git-send-email-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 1.7.6.4 In-Reply-To: <1320606840-21132-1-git-send-email-daniel.vetter@ffwll.ch> References: <1320606840-21132-1-git-send-email-daniel.vetter@ffwll.ch> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Useful when the page is already mapped to copy date in/out. Cc: dri-devel@lists.freedesktop.org Signed-off-by: Daniel Vetter --- drivers/gpu/drm/drm_cache.c | 23 +++++++++++++++++++++++ include/drm/drmP.h | 1 + 2 files changed, 24 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index 0e3bd5b..502771a 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -97,3 +97,26 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages) #endif } EXPORT_SYMBOL(drm_clflush_pages); + +void +drm_clflush_virt_range(char *addr, unsigned long length) +{ +#if defined(CONFIG_X86) + if (cpu_has_clflush) { + char *end = addr + length; + mb(); + for (; addr < end; addr += boot_cpu_data.x86_clflush_size) + clflush(addr); + clflush(end - 1); + mb(); + return; + } + + if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) + printk(KERN_ERR "Timed out waiting for cache flush.\n"); +#else + printk(KERN_ERR "Architecture has no drm_cache.c support\n"); + WARN_ON_ONCE(1); +#endif +} +EXPORT_SYMBOL(drm_clflush_virt_range); diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 43538b6..a082640 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1328,6 +1328,7 @@ extern int drm_authmagic(struct drm_device *dev, void *data, /* Cache management (drm_cache.c) */ void drm_clflush_pages(struct page *pages[], unsigned long num_pages); +void drm_clflush_virt_range(char *addr, unsigned long length); /* Locking IOCTL support (drm_lock.h) */ extern int drm_lock(struct drm_device *dev, void *data, -- 1.7.6.4