alyssa changed the topic of #panfrost to: Panfrost - FLOSS Mali Midgard + Bifrost + Valhall - Logs https://oftc.irclog.whitequark.org/panfrost - I don't know anything about WSI. That's my story and I'm sticking to it.
<robclark> AMD_performance_monitor isn't a _great_ extension if you can't read the counters from cmdstream.. it's ok as long as app doesn't try to begin or end the query at a point that would force a flush and cpu stall on gpu.. probably the more sane thing to use is perfetto/pps so the counters don't have to be coordinated with gpu rendering
<cphealy> Yea, I was thinking of the perfetto/pps integration (which works today). Is there an easy way to associate the perfetto/pps reporting with specific client frame render?
<robclark> some of the drivers have renderpass support.. the main thing is you need a way to capture a gpu timestamp from cmdstream
<robclark> u_trace gives the infrastructure to re-associated those timestamps with render-stage (or other) traces after the fact without having to stall waiting for gpu
<robclark> but not sure if mali has a way to read gpu perfcntr from cmdstream?
<robclark> on freedreno side, we have a counter that increments at a fixed rate (19.2MHz) which we use for gpu timestamps
<robclark> and then perfetto clock-sync traces to teach perfetto how to convert from gpu to cpu time
<HdkR> Very curious if that 19.2Mhz is going to bump to 1Ghz since ARMv9.x requires it at some point :D
<cphealy> robclark: Thanks for the hints!
<robclark> how does armv9 make requirements on gpu timestamp precision? Given that most adreno's run at slower clk than 1GHz, I can't see how that would be useful
<HdkR> robclark: They make requirements on the CPU cycle counter, which on Snapdragon as far as I'm aware are the same clock or at least linked to be the same. Since ARMv9.1/8.6 mandates 1Ghz it'll be interesting if it is strill intrinsically linked
<HdkR> If it is required on the CPU side, might be good to just reuse the clock since it is there :D
<robclark> hmm, I'd have to add some new uapi to query the rate instead of just hard-coding 19.2MHz like it has been since forever ;-)
<HdkR> haha, yep
<HdkR> Luckily even the latest thing announced is only ARMv9.0
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