linux-kernel - [tip:x86/urgent] x86/cpu/AMD: Extend X86_FEATURE

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Message-ID: <tip-96685a55a82c383cbba7ef1d4a636acf708cf17f@git.kernel.org>
Date:	Wed, 8 Jun 2016 07:18:18 -0700
From:	tip-bot for Borislav Petkov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	brgerst@...il.com, ray.huang@....com, hpa@...or.com,
	dvlasenk@...hat.com, tglx@...utronix.de, bp@...e.de,
	mingo@...nel.org, sherry.hurwitz@....com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	bp@...en8.de, luto@...capital.net, peterz@...radead.org
Subject: [tip:x86/urgent] x86/cpu/AMD: Extend X86_FEATURE_TOPOEXT workaround
 to newer models

Commit-ID:  96685a55a82c383cbba7ef1d4a636acf708cf17f
Gitweb:     http://git.kernel.org/tip/96685a55a82c383cbba7ef1d4a636acf708cf17f
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Wed, 1 Jun 2016 12:04:28 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 8 Jun 2016 13:51:34 +0200

x86/cpu/AMD: Extend X86_FEATURE_TOPOEXT workaround to newer models

We need to reenable the topology extensions CPUID leafs on newer models
too, if BIOS has disabled them, as we rely on them to get proper compute
unit topology.

Make the printk a once thing, while at it.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rui Huang <ray.huang@....com>
Cc: Sherry Hurwitz <sherry.hurwitz@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-hwmon@...r.kernel.org
Link: http://lkml.kernel.org/r/1464775468-23355-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/amd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index c343a54..f5c69d8 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -674,14 +674,14 @@ static void init_amd_bd(struct cpuinfo_x86 *c)
 	u64 value;
 
 	/* re-enable TopologyExtensions if switched off by BIOS */
-	if ((c->x86_model >= 0x10) && (c->x86_model <= 0x1f) &&
+	if ((c->x86_model >= 0x10) && (c->x86_model <= 0x6f) &&
 	    !cpu_has(c, X86_FEATURE_TOPOEXT)) {
 
 		if (msr_set_bit(0xc0011005, 54) > 0) {
 			rdmsrl(0xc0011005, value);
 			if (value & BIT_64(54)) {
 				set_cpu_cap(c, X86_FEATURE_TOPOEXT);
-				pr_info(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
+				pr_info_once(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
 			}
 		}
 	}