linux-kernel - [tip: x86/platform] cpufreq/amd-pstate: Disable preferred cores on designs with workload classification

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Message-ID: <175196903493.406.13263192898156163411.tip-bot2@tip-bot2>
Date: Tue, 08 Jul 2025 10:03:54 -0000
From: "tip-bot2 for Mario Limonciello" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Mario Limonciello <mario.limonciello@....com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>, Perry Yuan <perry.yuan@....com>,
 ilpo.jarvinen@...ux.intel.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/platform] cpufreq/amd-pstate: Disable preferred cores on
 designs with workload classification

The following commit has been merged into the x86/platform branch of tip:

Commit-ID:     bfea2b3b4f2346510ec45a0c22450e1564f48f88
Gitweb:        https://git.kernel.org/tip/bfea2b3b4f2346510ec45a0c22450e1564f48f88
Author:        Mario Limonciello <mario.limonciello@....com>
AuthorDate:    Mon, 09 Jun 2025 15:05:15 -05:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 07 Jul 2025 22:33:10 +02:00

cpufreq/amd-pstate: Disable preferred cores on designs with workload classification

On designs that have workload classification, it's preferred that
the amd-hfi driver is used to provide hints to the scheduler of
which cores to use instead of the amd-pstate driver.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
Reviewed-by: Perry Yuan <perry.yuan@....com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Link: https://lore.kernel.org/20250609200518.3616080-11-superm1@kernel.org
---
 drivers/cpufreq/amd-pstate.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index f3477ab..bbc27ef 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -826,6 +826,13 @@ static void amd_pstate_init_prefcore(struct amd_cpudata *cpudata)
 	if (!amd_pstate_prefcore)
 		return;

+	/* should use amd-hfi instead */
+	if (cpu_feature_enabled(X86_FEATURE_AMD_WORKLOAD_CLASS) &&
+	    IS_ENABLED(CONFIG_AMD_HFI)) {
+		amd_pstate_prefcore = false;
+		return;
+	}
+
 	cpudata->hw_prefcore = true;

 	/* Priorities must be initialized before ITMT support can be toggled on. */