linux-next: Tree for Aug 13 [ screen corruption in graphical mode ]

[Sedat Dilek]

On Tue, Aug 13, 2013 at 6:37 PM, Sedat Dilek <sedat.dilek at gmail.com> wrote:
> On Tue, Aug 13, 2013 at 6:34 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
>> On Tue, Aug 13, 2013 at 06:23:29PM +0200, Sedat Dilek wrote:
>>> On Tue, Aug 13, 2013 at 5:59 PM, Sedat Dilek <sedat.dilek at gmail.com> wrote:
>>> > I have bisected the issue on Linux v3.11-rc5 + drm-intel-nightly:
>>> >
>>> > 5456fe3882812aba251886e36fe55bfefb8e8829 is the first bad commit
>>> > commit 5456fe3882812aba251886e36fe55bfefb8e8829
>>> > Author: Chris Wilson <chris at chris-wilson.co.uk>
>>> > Date:   Thu Aug 8 14:41:07 2013 +0100
>>> >
>>> >     drm/i915: Allocate LLC ringbuffers from stolen
>>> >
>>> >     As stolen objects now behave identically (wrt to default LLC cacheing)
>>> >     as their normal system counterparts, we no longer have to differentiate
>>> >     our usage for ringbuffers. So allocate them from stolen on SNB+ as well.
>>> >
>>> >     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>>> >     Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>>> >     Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>>> >
>>> > :040000 040000 de063a052f39095f4d2f51b49caef9f827df41e8
>>> > 1c819aa5501a9fcc9912a5c7c037c71b9b9e9a6b M      drivers
>>> >
>>> > See also attached files!
>>> >
>>>
>>> With the attached revert-patch my system is OK (with my customized X stack).
>>
>> No indication of a GPU hang? I'm puzzled as to how this ends up with the
>> scanout being misread.
>>
>> cat /sys/kernel/debug/dri/0/i915_gem_stolen
>> cat /sys/kernel/debug/dri/0/i915_gem_framebuffer
>>
>> would be interesting.
>
> With revert-patch applied:
>
> $ sudo cat /sys/kernel/debug/dri/0/i915_gem_stolen
> Stolen:
>    ffff88007f6f5200: p g     4128KiB 77 00 0 0 0 uncached (name: 1)
> (pinned x 1) (display) (ggtt offset: 00072000, size: 00408000)
> (stolen: 00000000) (p mappable)
> Total 1 objects, 4227072 bytes, 4227072 GTT size
>
> $ sudo cat /sys/kernel/debug/dri/0/i915_gem_framebuffer
> fbcon size: 1366 x 768, depth 24, 32 bpp, refcount 2, obj
> ffff88007f6f5200: p g     4128KiB 77 00 0 0 0 uncached (name: 1)
> (pinned x 1) (display) (ggtt offset: 00072000, size: 00408000)
> (stolen: 00000000) (p mappable)
> user size: 1366 x 768, depth 24, 32 bpp, refcount 3, obj
> ffff88007f6f5080: pXg     5120KiB 36 02 124873 124873 0 uncached dirty
> (name: 3) (pinned x 1) (display) (fence: 0) (ggtt offset: 0047a000,
> size: 00500000) (p mappable) (blitter ring)
>

Attached both outputs with GOOD and BAD (BROKEN) kernel.

- Sedat -
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fbcon size: 1366 x 768, depth 24, 32 bpp, refcount 2, obj ffff880074492e40: p g     4128KiB 77 00 0 0 0 uncached (name: 1) (pinned x 1) (display) (ggtt offset: 00072000, size: 00408000) (stolen: 00000000) (p mappable)
user size: 1366 x 768, depth 24, 32 bpp, refcount 3, obj ffff880074492840: pXg     5120KiB 36 02 158126 158126 0 uncached dirty (name: 3) (pinned x 1) (display) (fence: 0) (ggtt offset: 0047a000, size: 00500000) (p mappable) (blitter ring)
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fbcon size: 1366 x 768, depth 24, 32 bpp, refcount 2, obj ffff880073995200: p g     4128KiB 77 00 0 0 0 uncached (name: 1) (pinned x 1) (display) (ggtt offset: 00072000, size: 00408000) (stolen: 00060000) (p mappable)
user size: 1366 x 768, depth 24, 32 bpp, refcount 3, obj ffff8800736d8e00: pXg     5120KiB 36 02 -737 -737 0 uncached dirty (name: 3) (pinned x 1) (display) (fence: 0) (ggtt offset: 0047a000, size: 00500000) (p mappable) (blitter ring)
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Stolen:
   ffff880074492e40: p g     4128KiB 77 00 0 0 0 uncached (name: 1) (pinned x 1) (display) (ggtt offset: 00072000, size: 00408000) (stolen: 00000000) (p mappable)
Total 1 objects, 4227072 bytes, 4227072 GTT size
-------------- next part --------------
Stolen:
   ffff880073995c80: p g      128KiB 40 40 0 0 0 snooped or LLC dirty (pinned x 1) (ggtt offset: 00001000, size: 00020000) (stolen: 00000000) (p mappable)
   ffff880073995800: p g      128KiB 40 40 0 0 0 snooped or LLC dirty (pinned x 1) (ggtt offset: 00023000, size: 00020000) (stolen: 00020000) (p mappable)
   ffff880073995500: p g      128KiB 40 40 0 0 0 snooped or LLC dirty (pinned x 1) (ggtt offset: 00044000, size: 00020000) (stolen: 00040000) (p mappable)
   ffff880073995200: p g     4128KiB 77 00 0 0 0 uncached (name: 1) (pinned x 1) (display) (ggtt offset: 00072000, size: 00408000) (stolen: 00060000) (p mappable)
Total 4 objects, 4620288 bytes, 4620288 GTT size