Re: [Intel-gfx] [PATCH] drm/i915: Disable all outputs early, before KMS takeover

Pekka Enberg
2011-04-05T14:31:12Z

On Tue, Apr 5, 2011 at 5:27 PM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> On Tue, 5 Apr 2011 17:11:56 +0300, Pekka Enberg <penberg@kernel.org> wrote:
>> [    9.310010]  <IRQ>  [<ffffffff8168cd0c>] panic+0x91/0x19e
>> [    9.310010]  [<ffffffff816909ea>] oops_end+0xea/0xf0
>> [    9.310010]  [<ffffffff8106afbb>] no_context+0xfb/0x260
>> [    9.310010]  [<ffffffff8106b245>] __bad_area_nosemaphore+0x125/0x1e0
>> [    9.310010]  [<ffffffff8106b313>] bad_area_nosemaphore+0x13/0x20
>> [    9.310010]  [<ffffffff816930c0>] do_page_fault+0x310/0x4c0
>> [    9.310010]  [<ffffffff810ac06f>] ? up+0x2f/0x50
>> [    9.310010]  [<ffffffff8108652f>] ? console_unlock+0x17f/0x1d0
>> [    9.310010]  [<ffffffff8168fd25>] page_fault+0x25/0x30
>> [    9.310010]  [<ffffffffa0061628>] ? i915_handle_error+0x198/0xed0 [i915]
>> [    9.310010]  [<ffffffff8137d04a>] ? scsi_next_command+0x4a/0x60
>> [    9.310010]  [<ffffffff8137ddd6>] ? scsi_io_completion+0x2f6/0x630
>> [    9.310010]  [<ffffffffa0064c62>] i915_driver_irq_handler+0x472/0x17f0 [i915]
>>
>> This is the same pre-2.6.39-rc1 kernel with the two patches applied.
>> I'll try latest Linus master next to see if the same problem triggers.
>
> Hmm. Looks like we don't prevent the PGTBL_ER with those patches (or we
> provoke another), and trigger the error before we can handle it.

I'm guessing it's the same PGTBL_ER I've seen for the past two-three
kernel releases during boot. It seems to be harmless otherwise.