PCI Radeon RV100 detection hang on sparc64

[Michel Dänzer]

On 26.08.2014 16:07, Meelis Roos wrote:
>>>> r100 init hangs in a different place. Original dmesg first, then my
>>>> instrumented dmesg (seems to get further):
>>>
>>> The instrumented dmesg had a couple of my local test changes and was
>>> bad now that I had ROM. Reverted them exept my readb changes (instead
>>> of direct dereferences of iomapped space) and redid
>>> logging to be more precise.
>>>
>>>> [drm] radeon kernel modesetting enabled.
>>>> PCI: Enabling device: (0000:02:02.0), cmd 82
>>>> [drm] initializing kernel modesetting (RV100 0x1002:0x5159 0x1002:0x0908).
>>>> [drm] register mmio base: 0x10000000
>>>> [drm] register mmio size: 32768
>>>> [drm:radeon_device_init] *ERROR* Unable to find PCI I/O BAR
>>>
>>> This was still the unchanged kernel hanging.
>>>
>>> Below is a new debug log to pinpoint the hang. It seems to hang in
>>> r100_gfx_get_rptr but not on first try.
>>
>> It's most likely hanging in readl() in r100_mm_rreg() then.
>
> Yes, it is doing direct readl() there. But what does this hang mean?

I'm not sure if the read can hang because of the GPU, or if indicates a 
more fundamental PCI issue. Dave?


> By the way, I get these warnings from r100. Seem to be unrelated but
> still worth reporting IMHO:

Looks unrelated indeed.


-- 
Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer