ACK: [stonking][PATCH 0/3] Add support for Zen6 EPP tunings

[Andrei Gherzan]

On 2026/09/17 04:39PM, Yo-Jung Leo Lin (AMD) via kernel-team wrote:
> BugLink: https://bugs.launchpad.net/bugs/2167558
> 
> [ Impact ]
> 
> This patch series is part of the effort to enable Zen 6 client platform support on Ubuntu Stonking kernel.
> 
> EPP works differently in Zen6 client than in previous programs.  We now need some tuning data on a per core basis in amd-pstate to make sure that it behaves effectively.
> 
> [ Fix ]
> 
> Pick up the following patch series:
> 
> 1. [PATCH v3 0/3] Add support for Zen 6 client EPP tunings
> 
> Which has been included in linux-next
> 
> [ Test plan ]
> 
> This can be tested by hooking into event "amd_cpu:amd_pstate_epp_perf" with ftrace:
> 
> $ trace-cmd stream -e amd_cpu:amd_pstate_epp_perf
> 
> When toggling /sys/device/system/cpu/cpufreq/policyX/energy_performance_preference, the tracepoint ouput shows the EPP values changed to the values accordingly (performance, balance_performance, balance_power, power respectively):
> 
> 1. performance core: 25, 51, 64, 64
> 2. low_power core: 25, 51, 64, 115
> 3. efficiency core: 25, 51, 64, 115
> 
> [ Where problems could occur ]
> 
> This may include refactor of EPP lookup logic in amd-pmc driver. Errors in those refactors may lead to wrongly calculated EPP on older platforms.
> 
> [ Additional information ]
> 
> [1] https://lore.kernel.org/linux-pm/20260909033623.454449-1-mario.limonciello@amd.com/
> 
> Mario Limonciello (1):
>   cpufreq/amd-pstate: Show a warning if missing EPP tunings
> 
> Mario Limonciello (AMD) (2):
>   cpufreq/amd-pstate: Add per SoC and per core type EPP tuning values
>   cpufreq/amd-pstate: Add EPP tunings for Zen6 client platforms
> 
>  drivers/cpufreq/amd-pstate.c | 213 +++++++++++++++++++++++++++++------
>  drivers/cpufreq/amd-pstate.h |   2 +
>  2 files changed, 178 insertions(+), 37 deletions(-)

Acked-by: Andrei Gherzan <andrei.gherzan at canonical.com>

-- 
Andrei Gherzan
gpg: rsa4096/D4D94F67AD0E9640
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