linux-kernel - [PATCH v8 10/13] cpufreq/amd-pstate: Disable preferred cores on designs with workload classification

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Message-ID: <20250218190822.1039982-11-superm1@kernel.org>
Date: Tue, 18 Feb 2025 13:08:19 -0600
From: Mario Limonciello <superm1@...nel.org>
To: Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Mario Limonciello <mario.limonciello@....com>,
	Perry Yuan <perry.yuan@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	"H . Peter Anvin" <hpa@...or.com>,
	Jonathan Corbet <corbet@....net>,
	Huang Rui <ray.huang@....com>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	platform-driver-x86@...r.kernel.org (open list:AMD HETERO CORE HARDWARE FEEDBACK DRIVER),
	linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	linux-doc@...r.kernel.org (open list:DOCUMENTATION),
	linux-pm@...r.kernel.org (open list:AMD PSTATE DRIVER)
Subject: [PATCH v8 10/13] cpufreq/amd-pstate: Disable preferred cores on designs with workload classification

From: Mario Limonciello <mario.limonciello@....com>

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.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
Reviewed-by: Perry Yuan <perry.yuan@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/cpufreq/amd-pstate.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 08ae480768120..f425fb7ec77d7 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -806,6 +806,12 @@ static void amd_pstate_init_prefcore(struct amd_cpudata *cpudata)
 	/* user disabled or not detected */
 	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;
 
-- 
2.43.0