linux-kernel - [PATCH v1 2/2] x86/cpu: add Centaur Family >=7 CPUs initialization support

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Message-ID: <1599562666-31351-3-git-send-email-TonyWWang-oc@zhaoxin.com>
Date:   Tue, 8 Sep 2020 18:57:46 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <x86@...nel.org>, <hpa@...or.com>,
        <sean.j.christopherson@...el.com>, <liam.merwick@...cle.com>,
        <mlevitsk@...hat.com>, <linux-kernel@...r.kernel.org>
CC:     <TimGuo-oc@...oxin.com>, <CooperYan@...oxin.com>,
        <QiyuanWang@...oxin.com>, <HerryYang@...oxin.com>,
        <CobeChen@...oxin.com>
Subject: [PATCH v1 2/2] x86/cpu: add Centaur Family >=7 CPUs initialization support

add Centaur Family >=7 CPUs specific initialization support in centaur.c

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
---
 arch/x86/kernel/cpu/centaur.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
index 5f811586..345f7d9 100644
--- a/arch/x86/kernel/cpu/centaur.c
+++ b/arch/x86/kernel/cpu/centaur.c
@@ -65,6 +65,9 @@ static void init_c3(struct cpuinfo_x86 *c)
 		c->x86_cache_alignment = c->x86_clflush_size * 2;
 		set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 	}
+
+	if (c->x86 >= 7)
+		set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 }
 
 enum {
@@ -95,7 +98,8 @@ static void early_init_centaur(struct cpuinfo_x86 *c)
 	if (c->x86 == 5)
 		set_cpu_cap(c, X86_FEATURE_CENTAUR_MCR);
 #endif
-	if (c->x86 == 6 && c->x86_model >= 0xf)
+	if ((c->x86 == 6 && c->x86_model >= 0xf) ||
+	    (c->x86 >= 7))
 		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
 
 #ifdef CONFIG_X86_64
@@ -204,7 +208,7 @@ static void init_centaur(struct cpuinfo_x86 *c)
 		sprintf(c->x86_model_id, "WinChip %s", name);
 	}
 #endif
-	if (c->x86 == 6)
+	if (c->x86 == 6 || c->x86 >= 7)
 		init_c3(c);
 #ifdef CONFIG_X86_64
 	set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
-- 
2.7.4