On 09/28/2017 02:46 AM, Chris Wilson wrote:
Stealing the thread for another gem_workarounds conundrum. After a reset, we lose the RING_FORCE_TO_NONPRIV registers. If they where in the context image as we presumed, the values would be retained and they can be read back from before reset, so it's not the case of write-only register! So are they the mythical powercontext but require an LRI after reset to restore the settings for all logical contexts? Or can we make those into regular MMIO? -Chris
I cannot see these in any the context image formats, no matter the GEN, so I suspect they are regular (but privileged) MMIO registers. I think by "These are global registers and power context save/restored" they simply mean that they survive RC6.
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