Comment # 66
on bug 91880
from Alex Deucher
(In reply to Julian from comment #65) > (In reply to Alex Deucher from comment #64) > > (In reply to Julian from comment #63) > > > At first I thought it was an issue with the writeback feature that caches > > > certain register values because it also caches an rptr value that is used in > > > the driver's gpu_lockup_check and is, to my knowledge, never actually > > > written to. > > > > More likely it never gets written because the GPU has hung due to something > > else. > > Sorry, I meant that I've searched the radeon source for the lines of code > where the value was accessed from. I've only found instances of it being > read, no instances of it being written to. But I won't put too much stock > into that since I hardly know the code base at all. I plan to mess with the > code a little now that I know how to compile single modules. If I find > something substantial that this might be a bug, I'll open a new issue about > it. > The gpu writes to it. The driver only reads from it. The GPU shadows the value in system memory so that the driver doesn't have to read the register directly.
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