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From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
To: linux-kernel@vger.kernel.org, kexec@lists.infradead.org, x86@kernel.org
Cc: len.brown@intel.com, fenghua.yu@intel.com,
	rob.herring@calxeda.com, grant.likely@secretlab.ca,
	d.hatayama@jp.fujitsu.com, ebiederm@xmission.com, hpa@zytor.com,
	mingo@elte.hu, tglx@linutronix.de, vgoyal@redhat.com
Subject: [PATCH v1 1/2] x86, apic: Introduce boot_cpu_is_bsp indicating whether boot cpu is BSP or not
Date: Tue, 16 Oct 2012 13:35:23 +0900	[thread overview]
Message-ID: <20121016043523.20003.11838.stgit@localhost6.localdomain6> (raw)
In-Reply-To: <20121016043357.20003.5885.stgit@localhost6.localdomain6>

Part of boot-up code assumes booting CPU is BSP, but kexec can enter
the 2nd kernel with AP. To be able to distinguish these throughout
kernel processing, introduce boot_cpu_is_bsp.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
---

 arch/x86/include/asm/mpspec.h |    3 +++
 arch/x86/kernel/apic/apic.c   |   13 +++++++++++++
 arch/x86/kernel/setup.c       |    2 ++
 3 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index 3e2f42a..d56f253 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -47,10 +47,13 @@ extern int mp_bus_id_to_type[MAX_MP_BUSSES];
 extern DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
 
 extern unsigned int boot_cpu_physical_apicid;
+extern bool boot_cpu_is_bsp;
 extern unsigned int max_physical_apicid;
 extern int mpc_default_type;
 extern unsigned long mp_lapic_addr;
 
+extern void boot_cpu_is_bsp_init(void);
+
 #ifdef CONFIG_X86_LOCAL_APIC
 extern int smp_found_config;
 #else
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index b17416e..d8d69e4 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -62,6 +62,10 @@ unsigned disabled_cpus __cpuinitdata;
 /* Processor that is doing the boot up */
 unsigned int boot_cpu_physical_apicid = -1U;
 
+/* Indicates whether the processor that is doing the boot up, is BSP
+ * processor or not */
+bool boot_cpu_is_bsp;
+
 /*
  * The highest APIC ID seen during enumeration.
  */
@@ -2515,3 +2519,12 @@ static int __init lapic_insert_resource(void)
  * that is using request_resource
  */
 late_initcall(lapic_insert_resource);
+
+void boot_cpu_is_bsp_init(void)
+{
+	u32 l, h;
+
+	rdmsr(MSR_IA32_APICBASE, l, h);
+
+	boot_cpu_is_bsp = (l & MSR_IA32_APICBASE_BSP) ? true : false;
+}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index a2bb18e..6ecb9bc 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -988,6 +988,8 @@ void __init setup_arch(char **cmdline_p)
 
 	early_quirks();
 
+	boot_cpu_is_bsp_init();
+
 	/*
 	 * Read APIC and some other early information from ACPI tables.
 	 */


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kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

WARNING: multiple messages have this Message-ID (diff)
From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
To: linux-kernel@vger.kernel.org, kexec@lists.infradead.org, x86@kernel.org
Cc: mingo@elte.hu, tglx@linutronix.de, hpa@zytor.com,
	len.brown@intel.com, fenghua.yu@intel.com, vgoyal@redhat.com,
	ebiederm@xmission.com, grant.likely@secretlab.ca,
	rob.herring@calxeda.com, d.hatayama@jp.fujitsu.com
Subject: [PATCH v1 1/2] x86, apic: Introduce boot_cpu_is_bsp indicating whether boot cpu is BSP or not
Date: Tue, 16 Oct 2012 13:35:23 +0900	[thread overview]
Message-ID: <20121016043523.20003.11838.stgit@localhost6.localdomain6> (raw)
In-Reply-To: <20121016043357.20003.5885.stgit@localhost6.localdomain6>

Part of boot-up code assumes booting CPU is BSP, but kexec can enter
the 2nd kernel with AP. To be able to distinguish these throughout
kernel processing, introduce boot_cpu_is_bsp.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
---

 arch/x86/include/asm/mpspec.h |    3 +++
 arch/x86/kernel/apic/apic.c   |   13 +++++++++++++
 arch/x86/kernel/setup.c       |    2 ++
 3 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index 3e2f42a..d56f253 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -47,10 +47,13 @@ extern int mp_bus_id_to_type[MAX_MP_BUSSES];
 extern DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
 
 extern unsigned int boot_cpu_physical_apicid;
+extern bool boot_cpu_is_bsp;
 extern unsigned int max_physical_apicid;
 extern int mpc_default_type;
 extern unsigned long mp_lapic_addr;
 
+extern void boot_cpu_is_bsp_init(void);
+
 #ifdef CONFIG_X86_LOCAL_APIC
 extern int smp_found_config;
 #else
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index b17416e..d8d69e4 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -62,6 +62,10 @@ unsigned disabled_cpus __cpuinitdata;
 /* Processor that is doing the boot up */
 unsigned int boot_cpu_physical_apicid = -1U;
 
+/* Indicates whether the processor that is doing the boot up, is BSP
+ * processor or not */
+bool boot_cpu_is_bsp;
+
 /*
  * The highest APIC ID seen during enumeration.
  */
@@ -2515,3 +2519,12 @@ static int __init lapic_insert_resource(void)
  * that is using request_resource
  */
 late_initcall(lapic_insert_resource);
+
+void boot_cpu_is_bsp_init(void)
+{
+	u32 l, h;
+
+	rdmsr(MSR_IA32_APICBASE, l, h);
+
+	boot_cpu_is_bsp = (l & MSR_IA32_APICBASE_BSP) ? true : false;
+}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index a2bb18e..6ecb9bc 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -988,6 +988,8 @@ void __init setup_arch(char **cmdline_p)
 
 	early_quirks();
 
+	boot_cpu_is_bsp_init();
+
 	/*
 	 * Read APIC and some other early information from ACPI tables.
 	 */


  reply	other threads:[~2012-10-16  4:35 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-16  4:35 [PATCH v1 0/2] x86, apic: Disable BSP if boot cpu is AP HATAYAMA Daisuke
2012-10-16  4:35 ` HATAYAMA Daisuke
2012-10-16  4:35 ` HATAYAMA Daisuke [this message]
2012-10-16  4:35   ` [PATCH v1 1/2] x86, apic: Introduce boot_cpu_is_bsp indicating whether boot cpu is BSP or not HATAYAMA Daisuke
2012-10-16  4:35 ` [PATCH v1 2/2] x86, apic: Disable BSP if boot cpu is AP HATAYAMA Daisuke
2012-10-16  4:35   ` HATAYAMA Daisuke
2012-10-22 20:04   ` Eric W. Biederman
2012-10-22 20:04     ` Eric W. Biederman
2012-10-22 20:16     ` H. Peter Anvin
2012-10-22 20:16       ` H. Peter Anvin
2012-10-22 20:31       ` Eric W. Biederman
2012-10-22 20:31         ` Eric W. Biederman
2012-10-22 20:33         ` H. Peter Anvin
2012-10-22 20:33           ` H. Peter Anvin
2012-10-22 20:38           ` H. Peter Anvin
2012-10-22 20:38             ` H. Peter Anvin
2012-10-22 20:43           ` Eric W. Biederman
2012-10-22 20:43             ` Eric W. Biederman
2012-10-22 20:47             ` H. Peter Anvin
2012-10-22 20:47               ` H. Peter Anvin
2012-10-22 21:29               ` Eric W. Biederman
2012-10-22 21:29                 ` Eric W. Biederman
2012-10-23  0:35                 ` H. Peter Anvin
2012-10-23  0:35                   ` H. Peter Anvin
2012-10-26  3:24                   ` HATAYAMA Daisuke
2012-10-26  3:24                     ` HATAYAMA Daisuke
2012-10-26  4:13                     ` Eric W. Biederman
2012-10-26  4:13                       ` Eric W. Biederman
2013-03-11  1:07                       ` HATAYAMA Daisuke
2013-03-11  1:07                         ` HATAYAMA Daisuke
2013-03-11  2:13                         ` HATAYAMA Daisuke
2013-03-11  2:13                           ` HATAYAMA Daisuke
2013-03-11  4:11                           ` H. Peter Anvin
2013-03-11  4:11                             ` H. Peter Anvin
2012-10-16  4:51 ` [PATCH v1 0/2] " Yu, Fenghua
2012-10-16  4:51   ` Yu, Fenghua
2012-10-16  5:03   ` HATAYAMA Daisuke
2012-10-16  5:03     ` HATAYAMA Daisuke
2012-10-16  5:14     ` Yu, Fenghua
2012-10-16  5:14       ` Yu, Fenghua
2012-10-16  6:38       ` HATAYAMA Daisuke
2012-10-16  6:38         ` HATAYAMA Daisuke
2012-10-22 16:02         ` H. Peter Anvin
2012-10-22 16:02           ` H. Peter Anvin
2012-10-16  5:15     ` HATAYAMA Daisuke
2012-10-16  5:15       ` HATAYAMA Daisuke
2012-10-17 14:12 ` Vivek Goyal
2012-10-17 14:12   ` Vivek Goyal
2012-10-18  3:08   ` HATAYAMA Daisuke
2012-10-18  3:08     ` HATAYAMA Daisuke
2012-10-18 14:14     ` Vivek Goyal
2012-10-18 14:14       ` Vivek Goyal
2012-10-19  3:20       ` HATAYAMA Daisuke
2012-10-19  3:20         ` HATAYAMA Daisuke
2012-10-19 15:17         ` Vivek Goyal
2012-10-19 15:17           ` Vivek Goyal
2012-10-22  6:32           ` HATAYAMA Daisuke
2012-10-22  6:32             ` HATAYAMA Daisuke
2012-10-22 18:37             ` Vivek Goyal
2012-10-22 18:37               ` Vivek Goyal
2012-10-22 17:10           ` Michael Holzheu
2012-10-22 17:10             ` Michael Holzheu

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