From: Matt Turner <mattst88@gmail.com>
To: Michael Cree <mcree@orcon.net.nz>
Cc: Dave Airlie <airlied@gmail.com>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
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
Date: Thu, 24 Jun 2010 11:02:56 -0400 [thread overview]
Message-ID: <AANLkTilhX0f90twPYjBzD1RQ84Zu6V0TW6Zulh56AZza@mail.gmail.com> (raw)
In-Reply-To: <4C232AAC.2010200@orcon.net.nz>
On Thu, Jun 24, 2010 at 5:51 AM, Michael Cree <mcree@orcon.net.nz> wrote:
> On 22/06/10 20:32, Dave Airlie wrote:
>>
>> On Tue, Jun 22, 2010 at 3:59 PM, FUJITA Tomonori
>> <fujita.tomonori@lab.ntt.co.jp> wrote:
>>>
>>> On Mon, 21 Jun 2010 17:19:43 -0400
>>> Matt Turner<mattst88@gmail.com> 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.
Actually, I'm using a plain Radeon 9100 PCI.
> 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.
I confirm that we're getting -ENOMEM. I don't know if it's coming from
radeon_gart_bind(), but if it is there's an interesting comment
immediately after the call to pci_map_page:
if (pci_dma_mapping_error(rdev->pdev, rdev->gart.pages_addr[p])) {
/* FIXME: failed to map page (return -ENOMEM?) */
radeon_gart_unbind(rdev, offset, pages);
return -ENOMEM;
}
>> It might be worth limiting the PCIGART in radeon to 32MB to see if the
>> lower limit helps.
>
> So, how does one do that?
Boot with `radeon.test=1 radeon.gartsize=<size in MB>`.
> Cheers
> Michael.
Thanks,
Matt
next prev parent reply other threads:[~2010-06-24 15:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-21 21:19 Problems with alpha/pci + radeon/ttm Matt Turner
2010-06-22 5:59 ` FUJITA Tomonori
2010-06-22 8:32 ` Dave Airlie
2010-06-24 9:51 ` Michael Cree
2010-06-24 15:02 ` Matt Turner [this message]
2010-06-27 4:20 ` FUJITA Tomonori
2010-06-27 10:46 ` Michael Cree
2010-06-27 23:14 ` Dave Airlie
2010-06-28 9:03 ` Michael Cree
2010-06-28 16:08 ` Richard Henderson
2010-06-24 14:53 ` Matt Turner
2010-06-27 4:20 ` FUJITA Tomonori
2010-06-27 4:58 ` Matt Turner
2010-06-30 18:43 ` Konrad Rzeszutek Wilk
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