From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Subject: Re: [PATCH 1/5] io-mapping: ensure io_mapping_map_atomic _is_ atomic Date: Sat, 17 Sep 2011 21:43:37 +0100 Message-ID: References: <1316285749-30130-1-git-send-email-daniel.vetter@ffwll.ch> <1316285749-30130-2-git-send-email-daniel.vetter@ffwll.ch> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id 0F7749E77C for ; Sat, 17 Sep 2011 13:43:41 -0700 (PDT) In-Reply-To: <1316285749-30130-2-git-send-email-daniel.vetter@ffwll.ch> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx Cc: Daniel Vetter , stable@kernel.org List-Id: intel-gfx@lists.freedesktop.org On Sat, 17 Sep 2011 20:55:45 +0200, Daniel Vetter wrote: > For the !HAVE_ATOMIC_IOMAP case the stub functions did not call > pagefault_disable/_enable. The i915 driver relies on the map > actually being atomic, otherwise it can deadlock with it's own > pagefault handler in the gtt pwrite fastpath. > > This is exercised by gem_mmap_gtt from the intel-gpu-toosl gem > testsuite. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38115 > Cc: stable@kernel.org > Signed-off-by: Daniel Vetter Reviewed-by: Chris Wilson -Chris -- Chris Wilson, Intel Open Source Technology Centre