Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754753Ab0FXJvr (ORCPT ); Thu, 24 Jun 2010 05:51:47 -0400 Received: from mx1.orcon.net.nz ([219.88.242.51]:45625 "EHLO mx1.orcon.net.nz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754565Ab0FXJvp (ORCPT ); Thu, 24 Jun 2010 05:51:45 -0400 Message-ID: <4C232AAC.2010200@orcon.net.nz> Date: Thu, 24 Jun 2010 21:51:40 +1200 From: Michael Cree User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100515 Icedove/3.0.4 MIME-Version: 1.0 To: Dave Airlie CC: FUJITA Tomonori , mattst88@gmail.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, rth@twiddle.net, ink@jurassic.park.msu.ru, jbarnes@virtuousgeek.org, linux-pci@vger.kernel.org, dri-devel@lists.freedesktop.org, alexdeucher@gmail.com, jglisse@redhat.com Subject: Re: Problems with alpha/pci + radeon/ttm References: <20100622145805R.fujita.tomonori@lab.ntt.co.jp> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-DSPAM-Check: by mx1.orcon.net.nz on Thu, 24 Jun 2010 21:51:41 +1200 X-DSPAM-Result: Innocent X-DSPAM-Processed: Thu Jun 24 21:51:41 2010 X-DSPAM-Confidence: 0.8526 X-DSPAM-Probability: 0.0000 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3045 Lines: 82 On 22/06/10 20:32, Dave Airlie wrote: > On Tue, Jun 22, 2010 at 3:59 PM, FUJITA Tomonori > wrote: >> On Mon, 21 Jun 2010 17:19:43 -0400 >> Matt Turner wrote: >> >>> Michael Cree and I have been debugging FDO bug 26403 [1]. I tried >>> booting with `radeon.test=1` and found this, which I think is related: Note that my radeon card is PCI whereas I think Matt may be using an AGP card. My logs are very similar to Matt's except I don't see the following line: >>>> pci_map_single failed: could not allocate dma page tables >> This happens in the latest git, right? Indeed, testing 2.6.35-rc3 (plus a couple or so extra patches to fix unrelated compile errors). >> Is this a regression (what kernel version worked)? >> >> Seems that the IOMMU can't find 128 pages. It's likely due to: >> >> - out of the IOMMU space (possibly someone doesn't free the IOMMU >> space). >> >> or >> >> - the mapping parameters (such as align) aren't appropriate so the >> IOMMU can't find space. > > I don't think KMS drivers have ever worked on alpha so its not a > regression, they are working fine on x86 + powerpc and sparc has been > run at least once. KMS on the console boot up has worked since about 2.6.32, but starting up the X server has always failed and, in my case, the system becomes unstable and eventually OOPs. > I suspect we are simply hitting the limits of the iommu, how big an > address space does it handle? since generally graphics drivers try to > bind a lot of things to the GART. No idea on the address space limit. I applied the patch of Fujita that logs all IOMMU allocations, and also inserted some extra printks in the ttm kernel code so that I could see which routines failed and the error code returned. Running the radeon test on boot exhibits the following: [ 238.712768] [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0x1a312000 [ 239.281127] [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0x1a412000 [ 239.281127] ttm_tt_bind belched -12 [ 239.282104] ttm_bo_handle_move_mem belched -12 [ 239.282104] ttm_bo_move_buffer belched -12 [ 239.282104] ttm_bo_validate belched -12 [ 239.282104] radeon 0000:01:00.0: object_init failed for (1048576, 0x00000002) err=-12 [ 239.282104] [drm:radeon_test_moves] *ERROR* Failed to create GTT object 419 [ 239.399291] Error while testing BO move. Note that no IOMMU allocations are printed while radeon_test_moves is running so iommu_arena_alloc doesn't appear to be called. Also the error code returned up to radeon_test_moves is -12 which is ENOMEM. So does appear to be some memory limit. > It might be worth limiting the PCIGART in radeon to 32MB to see if the > lower limit helps. So, how does one do that? Cheers Michael. -- 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/