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Message-ID: <20240626171809.GSZnxNUd4tcRT4IB_k@fat_crate.local>
Date: Wed, 26 Jun 2024 19:18:09 +0200
From: Borislav Petkov <bp@...en8.de>
To: Mario Limonciello <mario.limonciello@....com>
Cc: "Gautham R . Shenoy" <gautham.shenoy@....com>,
Perry Yuan <perry.yuan@....com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
"H . Peter Anvin" <hpa@...or.com>, Huang Rui <ray.huang@....com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Nikolay Borisov <nik.borisov@...e.com>,
Peter Zijlstra <peterz@...radead.org>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@...r.kernel.org>,
"open list:AMD PSTATE DRIVER" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 2/2] cpufreq: amd-pstate: Use amd_get_highest_perf() to
lookup perf values
On Tue, Jun 25, 2024 at 11:20:43PM -0500, Mario Limonciello wrote:
> + /*
> + * For AMD CPUs with Family ID 19H and Model ID range 0x70 to 0x7f,
> + * the highest performance level is set to 196.
> + * https://bugzilla.kernel.org/show_bug.cgi?id=218759
> + */
> + if (cpu_feature_enabled(X86_FEATURE_ZEN4)) {
> + switch (c->x86_model) {
> + case 0x70 ... 0x7f:
Aha, so here it is non-inclusive - "<" and not "<=".
So you need to check the model ranges first.
> + return CPPC_HIGHEST_PERF_PERFORMANCE;
> + default:
> + return CPPC_HIGHEST_PERF_DEFAULT;
As for patch 1.
> + }
> + }
> +
> + return CPPC_HIGHEST_PERF_DEFAULT;
> }
> EXPORT_SYMBOL_GPL(amd_get_highest_perf);
>
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 80eaa58f1405..f468d8562e17 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -52,8 +52,6 @@
> #define AMD_PSTATE_TRANSITION_LATENCY 20000
> #define AMD_PSTATE_TRANSITION_DELAY 1000
> #define AMD_PSTATE_FAST_CPPC_TRANSITION_DELAY 600
> -#define CPPC_HIGHEST_PERF_PERFORMANCE 196
> -#define CPPC_HIGHEST_PERF_DEFAULT 166
>
> #define AMD_CPPC_EPP_PERFORMANCE 0x00
> #define AMD_CPPC_EPP_BALANCE_PERFORMANCE 0x80
This already doesn't apply:
checking file arch/x86/kernel/cpu/amd.c
checking file drivers/cpufreq/amd-pstate.c
Hunk #1 FAILED at 52.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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