linux-kernel - Re: [PATCH v3 1/2] x86/mce: new Centaur CPU support MCE broadcasting

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Date:   Mon, 30 Apr 2018 11:41:44 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     David Wang <davidwang@...oxin.com>
Cc:     tony.luck@...el.com, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, gregkh@...uxfoundation.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
        brucechang@...-alliance.com, cooperyan@...oxin.com,
        qiyuanwang@...oxin.com, benjaminpan@...tech.com,
        lukelin@...cpu.com, timguo@...oxin.com
Subject: Re: [PATCH v3 1/2] x86/mce: new Centaur CPU support MCE broadcasting

On Wed, Apr 25, 2018 at 06:33:39PM +0800, David Wang wrote:
> Newer Centaur multi-core CPU also support MCE broadcasting to all cores. But
> no Centaur special code tell this truth to kernel.  
> 
> Signed-off-by: David Wang <davidwang@...oxin.com>
> ---
>  arch/x86/kernel/cpu/mcheck/mce.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

I applied this with some minor improvements:

---
From: David Wang <davidwang@...oxin.com>
Date: Wed, 25 Apr 2018 18:33:39 +0800
Subject: [PATCH] x86/MCA: Enable MCE broadcasting on new Centaur CPUs

Newer Centaur multi-core CPUs also support MCE broadcasting to all
cores. Add a Centaur-specific init function setting that up.

 [ bp:
   - make mce_centaur_feature_init() static
   - flip check to do the f/m/s first for better readability
   - touch up text
  ]

Signed-off-by: David Wang <davidwang@...oxin.com>
Cc: Greg KH <greg@...ah.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: benjaminpan@...tech.com
Cc: brucechang@...-alliance.com
Cc: cooperyan@...oxin.com
Cc: lukelin@...cpu.com
Cc: qiyuanwang@...oxin.com
Cc: timguo@...oxin.com
Cc: x86-ml <x86@...nel.org>
Cc: linux-edac <linux-edac@...r.kernel.org>
Link: http://lkml.kernel.org/r/1524652420-17330-2-git-send-email-davidwang@zhaoxin.com
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 42cf2880d0ed..cd76380af79f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1727,6 +1727,21 @@ static void __mcheck_cpu_init_early(struct cpuinfo_x86 *c)
 	}
 }
 
+static void mce_centaur_feature_init(struct cpuinfo_x86 *c)
+{
+	struct mca_config *cfg = &mca_cfg;
+
+	 /*
+	  * All newer Centaur CPUs support MCE broadcasting. Enable
+	  * synchronization with a one second timeout.
+	  */
+	if ((c->x86 == 6 && c->x86_model == 0xf && c->x86_stepping >= 0xe) ||
+	     c->x86 > 6) {
+		if (cfg->monarch_timeout < 0)
+			cfg->monarch_timeout = USEC_PER_SEC;
+	}
+}
+
 static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 {
 	switch (c->x86_vendor) {
@@ -1739,6 +1754,9 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 		mce_amd_feature_init(c);
 		break;
 		}
+	case X86_VENDOR_CENTAUR:
+		mce_centaur_feature_init(c);
+		break;
 
 	default:
 		break;
-- 
2.13.0

-- 
Regards/Gruss,
    Boris.

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