From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932142Ab1LWVcH (ORCPT ); Fri, 23 Dec 2011 16:32:07 -0500 Received: from home.keithp.com ([63.227.221.253]:32936 "EHLO keithp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757817Ab1LWVcD (ORCPT ); Fri, 23 Dec 2011 16:32:03 -0500 From: Keith Packard To: intel-gfx@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Keith Packard , Daniel Vetter , Eugeni Dodonov Subject: [PATCH] drm/i915: Disable semaphores by default on SNB Date: Fri, 23 Dec 2011 13:33:07 -0800 Message-Id: <1324675987-31033-1-git-send-email-keithp@keithp.com> X-Mailer: git-send-email 1.7.7.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Semaphores still cause problems on some machines: > From Udo Steinberg: > > With Linux-3.2-rc6 I'm frequently seeing GPU hangs when large amounts of > text scroll in an xterm, such as when extracting a tar archive. Such as this > one (note the timestamps): > > I can reproduce it fairly easily with something > as simple as: > > while true; do dmesg; done This patch turns them off on SNB while leaving them on for IVB. Reported-by: Udo Steinberg Cc: Daniel Vetter Cc: Eugeni Dodonov Signed-off-by: Keith Packard --- drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index c681dc1..0d4d308 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -758,7 +758,7 @@ intel_enable_semaphores(struct drm_device *dev) /* Enable semaphores on SNB when IO remapping is off */ if (INTEL_INFO(dev)->gen == 6) - return !intel_iommu_enabled; + return 0; return 1; } -- 1.7.7.3