[Intel-gfx] How to debug GTT/PTE errors?

[Paul Menzel]

Dear Linux folks,


although there are no user visible issues, there is still the following
error message in the log.

>         [    1.235596] i915: render error detected, EIR: 0x00000010
>         [    1.235596] i915: page table error
>         [    1.235596] i915:   PGTBL_ER: 0x00000012
>         [    1.235596] [drm:i915_report_and_clear_eir] *ERROR* EIR stuck: 0x00000010, masking
>         [    1.235596] i915: render error detected, EIR: 0x00000010
>         [    1.235596] i915: page table error
>         [    1.235596] i915:   PGTBL_ER: 0x00000012
>         [    1.310633] [drm:intel_modeset_init], 2 display pipes available.
> 
> The intel-gpu-tools [6] include the program `intel-error-decode`, which
> give the following.
> 
>         $ ./intel_error_decode /tmp/5927_7/error
>         Time: 1402269737 s 277725 us
>         Kernel: 3.14.4-gnuowen
>         PCI ID: 0x27a2
>         Detected GEN3 chipset
>         EIR: 0x00000010
>         IER: 0x00028053
>         PGTBL_ER: 0x00000012
>             Display A: Invalid GTT PTE
>             Host Invalid PTE data
>         […]

Is there an option that the GTT is dumped on such an error or the
addresses are shown in the logs to exactly see where in memory the
problem is?


Thanks,

Paul


[1] http://www.coreboot.org/pipermail/coreboot/2014-June/078092.html
[6] http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/
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