linux-kernel - [tip:x86/urgent] x86/apic/numachip: Fix sibling map with NumaChip

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Message-ID: <tip-c8a470cab030bae8f9e6e5cfff72b047b7c627a7@git.kernel.org>
Date:	Mon, 16 Mar 2015 05:06:32 -0700
From:	tip-bot for Daniel J Blueman <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	daniel@...ascale.com, mingo@...nel.org, hpa@...or.com,
	sp@...ascale.com, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, bp@...e.de, tglx@...utronix.de
Subject: [tip:x86/urgent] x86/apic/numachip: Fix sibling map with NumaChip

Commit-ID:  c8a470cab030bae8f9e6e5cfff72b047b7c627a7
Gitweb:     http://git.kernel.org/tip/c8a470cab030bae8f9e6e5cfff72b047b7c627a7
Author:     Daniel J Blueman <daniel@...ascale.com>
AuthorDate: Thu, 12 Mar 2015 16:55:13 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 12 Mar 2015 16:58:59 +0100

x86/apic/numachip: Fix sibling map with NumaChip

On NumaChip systems, the physical processor ID assignment wasn't
accounting for the number of nodes in AMD multi-module
processors, giving an incorrect sibling map:

  $ cd /sys/devices/system/cpu/cpu29/topology
  $ grep . *
  core_id:5
  core_siblings:00000000,ff000000
  core_siblings_list:24-31
  physical_package_id:3
  thread_siblings:00000000,30000000
  thread_siblings_list:28-29

This fixes it:

  $ cd /sys/devices/system/cpu/cpu29/topology
  $ grep . *
  core_id:5
  core_siblings:00000000,ffff0000
  core_siblings_list:16-31
  physical_package_id:1
  thread_siblings:00000000,30000000
  thread_siblings_list:28-29

Signed-off-by: Daniel J Blueman <daniel@...ascale.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: <stable@...r.kernel.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Steffen Persvold <sp@...ascale.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1426135950-10110-1-git-send-email-daniel@numascale.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/apic/apic_numachip.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c
index c2fd21f..017149c 100644
--- a/arch/x86/kernel/apic/apic_numachip.c
+++ b/arch/x86/kernel/apic/apic_numachip.c
@@ -37,10 +37,12 @@ static const struct apic apic_numachip;
 static unsigned int get_apic_id(unsigned long x)
 {
 	unsigned long value;
-	unsigned int id;
+	unsigned int id = (x >> 24) & 0xff;
 
-	rdmsrl(MSR_FAM10H_NODE_ID, value);
-	id = ((x >> 24) & 0xffU) | ((value << 2) & 0xff00U);
+	if (static_cpu_has_safe(X86_FEATURE_NODEID_MSR)) {
+		rdmsrl(MSR_FAM10H_NODE_ID, value);
+		id |= (value << 2) & 0xff00;
+	}
 
 	return id;
 }
@@ -155,10 +157,18 @@ static int __init numachip_probe(void)
 
 static void fixup_cpu_id(struct cpuinfo_x86 *c, int node)
 {
-	if (c->phys_proc_id != node) {
-		c->phys_proc_id = node;
-		per_cpu(cpu_llc_id, smp_processor_id()) = node;
+	u64 val;
+	u32 nodes = 1;
+
+	this_cpu_write(cpu_llc_id, node);
+
+	/* Account for nodes per socket in multi-core-module processors */
+	if (static_cpu_has_safe(X86_FEATURE_NODEID_MSR)) {
+		rdmsrl(MSR_FAM10H_NODE_ID, val);
+		nodes = ((val >> 3) & 7) + 1;
 	}
+
+	c->phys_proc_id = node / nodes;
 }
 
 static int __init numachip_system_init(void)
--
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