Aymeric Wibo f261b63307 amdsmu: Initial work on a driver for the AMD SMU ... Start work on a driver for the AMD SMU (system management unit), which will eventually be used for getting S0ix statistics (e.g. how long the CPU has spent in the deepest - S0i3 - sleep state during the last sleep) as well as letting PMFW (power management firmware, running on the SMU) know when we intend to enter and exit sleep. It is what's responsible for actually turning off the VDD line to the CPU. With this commit, amdsmu is just able to get the SMU's firmware version on AMD Rembrandt, Phoenix, and Strix Point CPUs. This is the equivalent to amd-pmc on Linux. Reviewed by: cem, kib, mckusick Approved by: kib, mckusick Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D48683		2025-07-26 21:17:06 +02:00
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