[PATCH] perf/x86/rapl: Fix PP1 event for Intel Meteor/Lunar Lake

[Dave Hansen]

On 2/20/25 07:36, Lucas De Marchi wrote:
> On some boots the read of MSR_PP1_ENERGY_STATUS msr returns 0, causing
> perf_msr_probe() to make the power/events/energy-gpu event non-visible.
> When that happens, the msr always read 0 until the graphics module (i915
> for Meteor Lake, xe for Lunar Lake) is loaded. Then it starts returning
> something different and re-loading the rapl module "fixes" it.

What's the root cause here? Did the kernel do something funky? Or is
this a hardware bug?