Re: [coreboot] Intel native graphics init: Questions about GTT setup

[ron minnich]

Does anybody want to have a go at a further interpration of the errors?
That would help. Does this error mean a present bit was not set, or the
address was wrong, or ...

ron

On Sun, Jun 8, 2014 at 4:40 PM, Anthony Martin  wrote:
> Paul Menzel  once said:
> > since Linux 3.12+ graphics stolen memory seems to be used, which causes
> > a regression with coreboot and native graphics init at least on the
> > Intel 945 based Lenovo X60 [1].
> >
> > This seems to be solved by properly setting register `PGETBL_CTL` [2],
> > but the Linux kernel Intel graphics driver still reports a GTT (Graphics
> > Translation Table) related error during start-up, but everything else
> > seems to work.
> >     [    1.235640] [drm] GPU crash dump saved to
>
> /sys/class/drm/card0/error
> >     [    1.236583] [drm] GPU hangs can indicate a bug anywhere in
>
> the entire gfx stack, including userspace.
> >     [    1.236583] [drm] Please file a _new_ bug report on
>
> bugs.freedesktop.org against DRI -> DRM/Intel
> >     [    1.236583] [drm] drm/i915 developers can then reassign to
>
> the right component if it's not a kernel issue.
> >     [    1.236583] [drm] The gpu crash dump is required to analyze
>
> gpu hangs, so please always attach it.
> >     [    1.236583] i915: render error detected, EIR: 0x00000010
> >     [    1.236583] i915: page table error
> >     [    1.236583] i915:   PGTBL_ER: 0x00000013
> >     [    1.236583] [drm:i915_report_and_clear_eir] *ERROR* EIR
>
> stuck: 0x00000010, masking
> >     [    1.236583] i915: render error detected, EIR: 0x00000010
> >     [    1.236583] i915: page table error
> >     [    1.236583] i915:   PGTBL_ER: 0x00000013
>
> FWIW, I will occasionally get the same message and the apparent
> working behavior after resume on a MacBook2,1 using stock Apple
> EFI firmware. The MacBook uses the same chipset as the X60.
>
> [49087.421096] [drm] GPU crash dump saved to /sys/class/drm/card0/error
> [49087.421096] [drm] GPU hangs can indicate a bug anywhere in the entire
> gfx stack, including userspace.
> [49087.421097] [drm] Please file a _new_ bug report on
> bugs.freedesktop.org against DRI -> DRM/Intel
> [49087.421097] [drm] drm/i915 developers can then reassign to the right
> component if it's not a kernel issue.
> [49087.421098] [drm] The gpu crash dump is required to analyze gpu hangs,
> so please always attach it.
> [49087.421763] i915: render error detected, EIR: 0x00000010
> [49087.421763] i915: page table error
> [49087.421763] i915:   PGTBL_ER: 0x00000001
> [49087.421763] [drm:i915_report_and_clear_eir] *ERROR* EIR stuck:
> 0x00000010, masking
> [49087.421763] i915: render error detected, EIR: 0x00000010
> [49087.421763] i915: page table error
> [49087.421763] i915:   PGTBL_ER: 0x00000001
>
> Anthony