linux-kernel - [PATCH AUTOSEL 5.15 07/21] tools/power/cpupower: Fix Pstate frequency reporting on AMD Family 1Ah CPUs

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: <20240618124139.3303801-7-sashal@kernel.org>
Date: Tue, 18 Jun 2024 08:41:06 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>,
	Ananth Narayan <Ananth.Narayan@....com>,
	Mario Limonciello <mario.limonciello@....com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>,
	trenn@...e.com,
	shuah@...nel.org,
	linux-pm@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 07/21] tools/power/cpupower: Fix Pstate frequency reporting on AMD Family 1Ah CPUs

From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>

[ Upstream commit 43cad521c6d228ea0c51e248f8e5b3a6295a2849 ]

Update cpupower's P-State frequency calculation and reporting with AMD
Family 1Ah+ processors, when using the acpi-cpufreq driver. This is due
to a change in the PStateDef MSR layout in AMD Family 1Ah+.

Tested on 4th and 5th Gen AMD EPYC system

Signed-off-by: Ananth Narayan <Ananth.Narayan@....com>
Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/power/cpupower/utils/helpers/amd.c | 26 +++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c
index 97f2c857048e1..e0a7a9b1f6d69 100644
--- a/tools/power/cpupower/utils/helpers/amd.c
+++ b/tools/power/cpupower/utils/helpers/amd.c
@@ -38,6 +38,16 @@ union core_pstate {
 		unsigned res1:31;
 		unsigned en:1;
 	} pstatedef;
+	/* since fam 1Ah: */
+	struct {
+		unsigned fid:12;
+		unsigned res1:2;
+		unsigned vid:8;
+		unsigned iddval:8;
+		unsigned idddiv:2;
+		unsigned res2:31;
+		unsigned en:1;
+	} pstatedef2;
 	unsigned long long val;
 };
 
@@ -45,6 +55,10 @@ static int get_did(union core_pstate pstate)
 {
 	int t;
 
+	/* Fam 1Ah onward do not use did */
+	if (cpupower_cpu_info.family >= 0x1A)
+		return 0;
+
 	if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF)
 		t = pstate.pstatedef.did;
 	else if (cpupower_cpu_info.family == 0x12)
@@ -58,12 +72,18 @@ static int get_did(union core_pstate pstate)
 static int get_cof(union core_pstate pstate)
 {
 	int t;
-	int fid, did, cof;
+	int fid, did, cof = 0;
 
 	did = get_did(pstate);
 	if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF) {
-		fid = pstate.pstatedef.fid;
-		cof = 200 * fid / did;
+		if (cpupower_cpu_info.family >= 0x1A) {
+			fid = pstate.pstatedef2.fid;
+			if (fid > 0x0f)
+				cof = (fid * 5);
+		} else {
+			fid = pstate.pstatedef.fid;
+			cof = 200 * fid / did;
+		}
 	} else {
 		t = 0x10;
 		fid = pstate.pstate.fid;
-- 
2.43.0