linux-kernel - Problems with alpha/pci + radeon/ttm

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Date:	Mon, 21 Jun 2010 17:19:43 -0400
From:	Matt Turner <mattst88@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-alpha@...r.kernel.org
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Michael Cree <mcree@...on.net.nz>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>, Dave Airlie <airlied@...il.com>,
	Alex Deucher <alexdeucher@...il.com>,
	Jerome Glisse <jglisse@...hat.com>
Subject: Problems with alpha/pci + radeon/ttm

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:

> [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0x202000
> [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0x302000
[snip]
> [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0xfd02000
> [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0xfe02000
> pci_map_single failed: could not allocate dma page tables
> [drm:radeon_ttm_backend_bind] *ERROR* failed to bind 128 pages at 0x0FF02000
> [TTM] Couldn't bind backend.
> radeon 0000:00:07.0: object_init failed for (1048576, 0x00000002)
> [drm:radeon_test_moves] *ERROR* Failed to create GTT object 253
> Error while testing BO move.

>From what I can see, the call chain is
radeon_test_moves
 (radeon_ttm_backend_bind called through callback function)
 - radeon_ttm.c:radeon_ttm_backend_bind calls radeon_gart_bind
  - radeon_gart.c:radeon_gart_bind calls pci_map_page
   - pci_map_page is alpha_pci_map_page, which calls...
    - alpha_pci_map_page calls pci_iommu.c:pci_map_single_1
     - pci_map_single_1 calls iommu_arena_alloc
      - iommu_arena_alloc calls iommu_arena_find_pages
       - iommu_arena_find_pages returns non-0
      - iommu_arena_alloc returns non-0
     - pci_map_single_1 returns 0 after printing
       "could not allocate dma page tables" error
    - alpha_pci_map_page returns 0 from pci_map_single_1
  - radeon_gart_bind returns non-0, error path prints
    "*ERROR* failed to bind 128 pages at 0x0FF02000"

Is this the cause of the bug we're seeing in the report [1]?

Anyone know what's going wrong here?

Thanks!
Matt Turner

[1] https://bugs.freedesktop.org/show_bug.cgi?id=26403
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