linux-kernel - [PATCH v7 10/12] cpufreq/amd-pstate: Disable preferred cores on designs with workload classification

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241130140703.557-11-mario.limonciello@amd.com>
Date: Sat, 30 Nov 2024 08:07:01 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Borislav Petkov <bp@...en8.de>
CC: 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>,
	"Rafael J . Wysocki" <rafael@...nel.org>, "Gautham R . Shenoy"
	<gautham.shenoy@....com>, Mario Limonciello <mario.limonciello@....com>,
	Perry Yuan <perry.yuan@....com>, Brijesh Singh <brijesh.singh@....com>, Peter
 Zijlstra <peterz@...radead.org>, Li RongQing <lirongqing@...du.com>, "open
 list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@...r.kernel.org>,
	"open list:ACPI" <linux-acpi@...r.kernel.org>, "open list:AMD PSTATE DRIVER"
	<linux-pm@...r.kernel.org>, Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Subject: [PATCH v7 10/12] 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.

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 d7630bab2516f..6039c719961d6 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -788,6 +788,12 @@ 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