[Nouveau] [PATCH/TESTING(all hw)/DISCUSSION] FIFO (minor) create and (major) destroy instabilities on nv50+

[okias]

Lastest patch work for me. NV96

2010/1/4 Maarten Maathuis <madman2003 at gmail.com>:
> I've narrowed it down further, the "pgraph->fifo_access" bit is still
> cleanup (register 0x400500 represents pgraph fifo access), the rest
> appears needed for the desired effect. The reordering of pfifo and
> pgraph destroy is needed. As usual, feedback is appreciated.
>
> Maarten.
>
> On Sat, Jan 2, 2010 at 4:36 PM, Maarten Maathuis <madman2003 at gmail.com> wrote:
>> Many people using nv50+ hardware are aware of gpu lockups when a fifo
>> closes under certain conditions. Based on a mmio-trace and some trail
>> and error testing i've come up with a patch that improves the
>> situation on my NV96.
>>
>> This patch needs testing on NV50+ hardware and regression testing on
>> older hardware, since i did change some of the common codepaths. This
>> is very much a work in progress, and if you have anything to
>> add/correct, please share it.
>>
>> I've also attached a 2 test apps, once is bitscan-fail from mwk, use
>> it like ./bitscan-fail 0x200 to trigger PGRAPH errors. A modified
>> version only emits NOPs (method 0x100) and represents the no error
>> situation.
>>
>> For me, i can run the NOP program in loops of 10000 iterations with no
>> problems (i've done so several times), the bitscan-fail survives 10000
>> iterations sometimes, but can also fail after a few thousand. In
>> comparison, a single run of bitscan-fail could cause a gpu lockup for
>> me in the past.
>>
>> Please try the gallium driver, the test apps, suspend to ram. Suspend
>> to ram isn't 100% reliable yet for me (this was always the case after
>> strange experiments/hammering/etc), but should not regress. This goes
>> for older hw as well, whatever worked should still work, but i
>> wouldn't expect serious improvements there.
>>
>> As always, feedback is appreciated, especially since this is a touchy subject.
>>
>> Maarten.
>>
>
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