linux-kernel - [PATCH] x86/cstate: Add Zhaoxin ACPI Cx FFH MWAIT support

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

Message-ID: <bccae278-e735-4681-cb3a-41359e42032b@zhaoxin.com>
Date:   Wed, 22 Jun 2022 11:29:41 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     <rafael@...nel.org>, <len.brown@...el.com>, <pavel@....cz>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <CobeChen@...oxin.com>, <TimGuo@...oxin.com>,
        <LindaChai@...oxin.com>, <LeoLiu@...oxin.com>
Subject: [PATCH] x86/cstate: Add Zhaoxin ACPI Cx FFH MWAIT support

Recent Zhaoxin CPUs support X86_FEATURE_MWAIT that implies the
MONITOR/MWAIT instructions can be used for ACPI Cx state. The BIOS
declares Cx state in _CST object to use FFH on Zhaoxin systems. So
let function ffh_cstate_init() support Zhaoxin too.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
---
  arch/x86/kernel/acpi/cstate.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index 7945eae..d4185e1 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -213,7 +213,9 @@ static int __init ffh_cstate_init(void)

  	if (c->x86_vendor != X86_VENDOR_INTEL &&
  	    c->x86_vendor != X86_VENDOR_AMD &&
-	    c->x86_vendor != X86_VENDOR_HYGON)
+	    c->x86_vendor != X86_VENDOR_HYGON &&
+	    c->x86_vendor != X86_VENDOR_CENTAUR &&
+	    c->x86_vendor != X86_VENDOR_ZHAOXIN)
  		return -1;

  	cpu_cstate_entry = alloc_percpu(struct cstate_entry);
-- 
2.7.4