From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753952Ab2I0RuK (ORCPT ); Thu, 27 Sep 2012 13:50:10 -0400 Received: from cassiel.sirena.org.uk ([80.68.93.111]:45338 "EHLO cassiel.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753250Ab2I0RuF (ORCPT ); Thu, 27 Sep 2012 13:50:05 -0400 Date: Thu, 27 Sep 2012 18:49:40 +0100 From: Mark Brown To: Marek Szyprowski Cc: "'Thierry Reding'" , "'Michal Nazarewicz'" , linux-kernel@vger.kernel.org, Peter Ujfalusi Subject: Re: CMA broken in next-20120926 Message-ID: <20120927174939.GA5460@sirena.org.uk> References: <20120927112911.GA25959@avionic-0098.mockup.avionic-design.de> <000601cd9cc9$100428c0$300c7a40$%szyprowski@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000601cd9cc9$100428c0$300c7a40$%szyprowski@samsung.com> X-Cookie: We've upped our standards, so up yours! User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: broonie@sirena.org.uk X-SA-Exim-Scanned: No (on cassiel.sirena.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 27, 2012 at 05:59:19PM +0200, Marek Szyprowski wrote: > On Thursday, September 27, 2012 1:29 PM Thierry Reding wrote: > > any idea why CMA might be broken in next-20120926. I see that there > > haven't been any major changes to CMA itself, but there's been quite a > > bit of restructuring of various memory allocation bits lately. I wasn't > > able to track the problem down, though. > > What I see is this during boot (with CMA_DEBUG enabled): > > [ 0.266904] cma: dma_alloc_from_contiguous(cma db474f80, count 64, align 6) > > [ 0.284469] cma: dma_alloc_from_contiguous(): memory range at c09d7000 is busy, retrying > > [ 0.293648] cma: dma_alloc_from_contiguous(): memory range at c09d7800 is busy, retrying > > ... > > [ 2.648619] DMA: failed to allocate 256 KiB pool for atomic coherent allocation > > ... > > [ 4.196193] WARNING: at /home/thierry.reding/src/kernel/linux-ipmp.git/arch/arm/mm/dma- > > mapping.c:485 __alloc_from_pool+0xdc/0x110() > > [ 4.207988] coherent pool not initialised! > > So the pool isn't getting initialized properly because CMA can't get at > > the memory. Do you have any hints as to what might be going on? If it's > > any help, I started seeing this with next-20120926 and it is in today's > > next as well. > Thanks for the report, I will check this issue asap. Myself and Peter have seen the same thing, though neither of us drilled down enough to make a sensible report.