linux-kernel - [PATCH] cpufreq: amd-pstate: Fix the inconsistency in max frequency units

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-next>] [day] [month] [year] [list]

Message-ID: <20240527051128.110091-1-Dhananjay.Ugwekar@amd.com>
Date: Mon, 27 May 2024 10:41:28 +0530
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
To: <rafael@...nel.org>, <ray.huang@....com>, <viresh.kumar@...aro.org>,
	<Mario.Limonciello@....com>, <gautham.shenoy@....com>
CC: <ananth.narayan@....com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <Perry.Yuan@....com>, Dhananjay Ugwekar
	<Dhananjay.Ugwekar@....com>
Subject: [PATCH] cpufreq: amd-pstate: Fix the inconsistency in max frequency units

The nominal frequency in cpudata is maintained in MHz whereas all other
frequencies are in KHz. This means we have to convert nominal frequency
value to KHz before we do any interaction with other frequency values.

In amd_pstate_set_boost(), this conversion from MHz to KHz is missed,
fix that.

Tested on a AMD Zen4 EPYC server

Before:
$ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq
2151
$ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq
400000
$ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq
2151
409422

After:
$ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq
2151000
$ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq
400000
$ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq
2151000
1799527

Fixes: ec437d71db77 ("cpufreq: amd-pstate: Introduce a new AMD P-State driver to support future processors")
Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
---
 drivers/cpufreq/amd-pstate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 1b7e82a0ad2e..cde3b91b4422 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -669,7 +669,7 @@ static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state)
 	if (state)
 		policy->cpuinfo.max_freq = cpudata->max_freq;
 	else
-		policy->cpuinfo.max_freq = cpudata->nominal_freq;
+		policy->cpuinfo.max_freq = cpudata->nominal_freq * 1000;
 
 	policy->max = policy->cpuinfo.max_freq;
 
-- 
2.34.1