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* [PATCH] x86 - UV Nodes without cpus
@ 2009-04-17 14:24 Jack Steiner
  2009-04-17 14:50 ` [tip:x86/urgent] x86/uv: fix init of cpu-less nodes tip-bot for Jack Steiner
  2009-04-17 20:45 ` tip-bot for Jack Steiner
  0 siblings, 2 replies; 3+ messages in thread
From: Jack Steiner @ 2009-04-17 14:24 UTC (permalink / raw)
  To: mingo, tglx; +Cc: linux-kernel

Fix an endcase in the UV initialization code for the "UV large system mode"
of apicids.  If node zero contains no cpus, cpus on another node will be the
boot cpu. The percpu data that contains the extra apicid bits was not
being initialized early enough.


Signed-off-by: Jack Steiner <steiner@sgi.com>


---
 arch/x86/kernel/apic/x2apic_uv_x.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c	2009-04-13 11:21:41.000000000 -0500
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c	2009-04-13 11:22:12.000000000 -0500
@@ -19,6 +19,7 @@
 #include <linux/timer.h>
 #include <linux/cpu.h>
 #include <linux/init.h>
+#include <linux/io.h>
 
 #include <asm/uv/uv_mmrs.h>
 #include <asm/uv/uv_hub.h>
@@ -34,6 +35,17 @@ DEFINE_PER_CPU(int, x2apic_extra_bits);
 
 static enum uv_system_type uv_system_type;
 
+static int early_get_nodeid(void)
+{
+	union uvh_node_id_u node_id;
+	unsigned long *mmr;
+
+	mmr = early_ioremap(UV_LOCAL_MMR_BASE | UVH_NODE_ID, sizeof(*mmr));
+	node_id.v = *mmr;
+	early_iounmap(mmr, sizeof(*mmr));
+	return node_id.s.node_id;
+}
+
 static int uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
 	if (!strcmp(oem_id, "SGI")) {
@@ -42,6 +54,8 @@ static int uv_acpi_madt_oem_check(char *
 		else if (!strcmp(oem_table_id, "UVX"))
 			uv_system_type = UV_X2APIC;
 		else if (!strcmp(oem_table_id, "UVH")) {
+			__get_cpu_var(x2apic_extra_bits) =
+				early_get_nodeid() << (UV_APIC_PNODE_SHIFT - 1);
 			uv_system_type = UV_NON_UNIQUE_APIC;
 			return 1;
 		}

^ permalink raw reply	[flat|nested] 3+ messages in thread
* [tip:x86/urgent] x86/uv: fix init of cpu-less nodes
  2009-04-17 14:24 [PATCH] x86 - UV Nodes without cpus Jack Steiner
@ 2009-04-17 14:50 ` tip-bot for Jack Steiner
  2009-04-17 20:45 ` tip-bot for Jack Steiner
  1 sibling, 0 replies; 3+ messages in thread
From: tip-bot for Jack Steiner @ 2009-04-17 14:50 UTC (permalink / raw)
  To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, steiner, tglx, mingo

Commit-ID:  1466083f6cce2aff147b4ebeab33ab20f661906d
Gitweb:     http://git.kernel.org/tip/1466083f6cce2aff147b4ebeab33ab20f661906d
Author:     Jack Steiner <steiner@sgi.com>
AuthorDate: Fri, 17 Apr 2009 09:24:47 -0500
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 17 Apr 2009 16:45:29 +0200

x86/uv: fix init of cpu-less nodes

Fix an endcase in the UV initialization code for the "UV large system mode"
of apicids.  If node zero contains no cpus, cpus on another node will be the
boot cpu.  The percpu data that contains the extra apicid bits was not
being initialized early enough.

[ Impact: fix potential boot crash on cpu-less UV nodes ]

Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20090417142447.GA23759@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
 arch/x86/kernel/apic/x2apic_uv_x.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 1248318..49d2f5c 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -19,6 +19,7 @@
 #include <linux/timer.h>
 #include <linux/cpu.h>
 #include <linux/init.h>
+#include <linux/io.h>
 
 #include <asm/uv/uv_mmrs.h>
 #include <asm/uv/uv_hub.h>
@@ -34,6 +35,17 @@ DEFINE_PER_CPU(int, x2apic_extra_bits);
 
 static enum uv_system_type uv_system_type;
 
+static int early_get_nodeid(void)
+{
+	union uvh_node_id_u node_id;
+	unsigned long *mmr;
+
+	mmr = early_ioremap(UV_LOCAL_MMR_BASE | UVH_NODE_ID, sizeof(*mmr));
+	node_id.v = *mmr;
+	early_iounmap(mmr, sizeof(*mmr));
+	return node_id.s.node_id;
+}
+
 static int uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
 	if (!strcmp(oem_id, "SGI")) {
@@ -42,6 +54,8 @@ static int uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 		else if (!strcmp(oem_table_id, "UVX"))
 			uv_system_type = UV_X2APIC;
 		else if (!strcmp(oem_table_id, "UVH")) {
+			__get_cpu_var(x2apic_extra_bits) =
+				early_get_nodeid() << (UV_APIC_PNODE_SHIFT - 1);
 			uv_system_type = UV_NON_UNIQUE_APIC;
 			return 1;
 		}

^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [tip:x86/urgent] x86/uv: fix init of cpu-less nodes
  2009-04-17 14:24 [PATCH] x86 - UV Nodes without cpus Jack Steiner
  2009-04-17 14:50 ` [tip:x86/urgent] x86/uv: fix init of cpu-less nodes tip-bot for Jack Steiner
@ 2009-04-17 20:45 ` tip-bot for Jack Steiner
  1 sibling, 0 replies; 3+ messages in thread
From: tip-bot for Jack Steiner @ 2009-04-17 20:45 UTC (permalink / raw)
  To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, steiner, tglx, mingo

Commit-ID:  27229ca63269c1be0a710f074fa9de4024f283f1
Gitweb:     http://git.kernel.org/tip/27229ca63269c1be0a710f074fa9de4024f283f1
Author:     Jack Steiner <steiner@sgi.com>
AuthorDate: Fri, 17 Apr 2009 09:24:47 -0500
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 17 Apr 2009 22:43:11 +0200

x86/uv: fix init of cpu-less nodes

Fix an endcase in the UV initialization code for the "UV large system mode"
of apicids.  If node zero contains no cpus, cpus on another node will be the
boot cpu.  The percpu data that contains the extra apicid bits was not
being initialized early enough.

[ Impact: fix potential boot crash on cpu-less UV nodes ]

Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20090417142447.GA23759@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
 arch/x86/kernel/apic/x2apic_uv_x.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 1248318..49d2f5c 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -19,6 +19,7 @@
 #include <linux/timer.h>
 #include <linux/cpu.h>
 #include <linux/init.h>
+#include <linux/io.h>
 
 #include <asm/uv/uv_mmrs.h>
 #include <asm/uv/uv_hub.h>
@@ -34,6 +35,17 @@ DEFINE_PER_CPU(int, x2apic_extra_bits);
 
 static enum uv_system_type uv_system_type;
 
+static int early_get_nodeid(void)
+{
+	union uvh_node_id_u node_id;
+	unsigned long *mmr;
+
+	mmr = early_ioremap(UV_LOCAL_MMR_BASE | UVH_NODE_ID, sizeof(*mmr));
+	node_id.v = *mmr;
+	early_iounmap(mmr, sizeof(*mmr));
+	return node_id.s.node_id;
+}
+
 static int uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
 	if (!strcmp(oem_id, "SGI")) {
@@ -42,6 +54,8 @@ static int uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 		else if (!strcmp(oem_table_id, "UVX"))
 			uv_system_type = UV_X2APIC;
 		else if (!strcmp(oem_table_id, "UVH")) {
+			__get_cpu_var(x2apic_extra_bits) =
+				early_get_nodeid() << (UV_APIC_PNODE_SHIFT - 1);
 			uv_system_type = UV_NON_UNIQUE_APIC;
 			return 1;
 		}

^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-04-17 20:46 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2009-04-17 14:24 [PATCH] x86 - UV Nodes without cpus Jack Steiner
2009-04-17 14:50 ` [tip:x86/urgent] x86/uv: fix init of cpu-less nodes tip-bot for Jack Steiner
2009-04-17 20:45 ` tip-bot for Jack Steiner

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