linux-kernel - [PATCH 1/2] cpufreq: Allow drivers to advertise boost enabled

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20240626041135.1559-2-mario.limonciello@amd.com>
Date: Tue, 25 Jun 2024 23:11:34 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: <linux-pm@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, Mario Limonciello
	<mario.limonciello@....com>, Viresh Kumar <viresh.kumar@...aro.org>, "Gautham
 R . Shenoy" <gautham.shenoy@....com>, Sibi Sankar <quic_sibis@...cinc.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>, Dhruva Gole <d-gole@...com>,
	Yipeng Zou <zouyipeng@...wei.com>, "Rafael J . Wysocki"
	<rafael.j.wysocki@...el.com>
Subject: [PATCH 1/2] cpufreq: Allow drivers to advertise boost enabled

The behavior introduced in commit f37a4d6b4a2c ("cpufreq: Fix per-policy
boost behavior on SoCs using cpufreq_boost_set_sw()") sets up the boost
policy incorrectly when boost has been enabled by the platform firmware
initially even if a driver sets the policy up.

This is because policy_has_boost_freq() assumes that there is a frequency
table set up by the driver and that the boost frequencies are advertised
in that table. This assumption doesn't work for acpi-cpufreq or
amd-pstate. Only use this check to enable boost if it's not already
enabled instead of also disabling it if alreayd enabled.

Fixes: f37a4d6b4a2c ("cpufreq: Fix per-policy boost behavior on SoCs using cpufreq_boost_set_sw()")
Suggested-by: Viresh Kumar <viresh.kumar@...aro.org>
Suggested-by: Gautham R. Shenoy <gautham.shenoy@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
Cc: Sibi Sankar <quic_sibis@...cinc.com>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Dhruva Gole <d-gole@...com>
Cc: Yipeng Zou <zouyipeng@...wei.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
v14->v15:
 * Use Viresh's suggestion
---
 drivers/cpufreq/cpufreq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 1fdabb660231..270ea04fb616 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1430,7 +1430,8 @@ static int cpufreq_online(unsigned int cpu)
 		}
 
 		/* Let the per-policy boost flag mirror the cpufreq_driver boost during init */
-		policy->boost_enabled = cpufreq_boost_enabled() && policy_has_boost_freq(policy);
+		if (cpufreq_boost_enabled() && policy_has_boost_freq(policy))
+			policy->boost_enabled = true;
 
 		/*
 		 * The initialization has succeeded and the policy is online.
-- 
2.43.0