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Date: Thu, 21 Aug 2008 19:04:42 +0100
From: Alex Nixon <alex.nixon@...rix.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Alex Nixon <alex.nixon@...rix.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 1/7] x86/paravirt: Add hooks for CPU hotplugging
Signed-off-by: Alex Nixon <alex.nixon@...rix.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Ingo Molnar <mingo@...e.hu>
---
arch/x86/kernel/paravirt.c | 8 ++++++++
arch/x86/kernel/process_32.c | 10 ++++++++--
arch/x86/kernel/process_64.c | 9 +++++++--
arch/x86/kernel/smpboot.c | 8 ++++----
include/asm-x86/paravirt.h | 27 +++++++++++++++++++++++++++
include/asm-x86/smp.h | 13 +++++++++++--
6 files changed, 65 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 7cd2747..8ffe4d1 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -125,6 +125,7 @@ static void *get_call_destination(u8 type)
.pv_apic_ops = pv_apic_ops,
.pv_mmu_ops = pv_mmu_ops,
.pv_lock_ops = pv_lock_ops,
+ .pv_hotplug_ops = pv_hotplug_ops,
};
return *((void **)&tmpl + type);
}
@@ -455,9 +456,16 @@ struct pv_mmu_ops pv_mmu_ops = {
.set_fixmap = native_set_fixmap,
};
+struct pv_hotplug_ops pv_hotplug_ops = {
+ .cpu_die = native_cpu_die,
+ .cpu_disable = native_cpu_disable,
+ .play_dead = native_play_dead,
+};
+
EXPORT_SYMBOL_GPL(pv_time_ops);
EXPORT_SYMBOL (pv_cpu_ops);
EXPORT_SYMBOL (pv_mmu_ops);
EXPORT_SYMBOL_GPL(pv_apic_ops);
EXPORT_SYMBOL_GPL(pv_info);
EXPORT_SYMBOL (pv_irq_ops);
+EXPORT_SYMBOL (pv_hotplug_ops);
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 593b73e..53887cd 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -77,6 +77,12 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
#ifdef CONFIG_HOTPLUG_CPU
#include <asm/nmi.h>
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define play_dead native_play_dead
+#endif
+
static void cpu_exit_clear(void)
{
int cpu = raw_smp_processor_id();
@@ -93,7 +99,7 @@ static void cpu_exit_clear(void)
}
/* We don't actually take CPU down, just spin without interrupts. */
-static inline void play_dead(void)
+void native_play_dead(void)
{
/* This must be done before dead CPU ack */
cpu_exit_clear();
@@ -109,7 +115,7 @@ static inline void play_dead(void)
wbinvd_halt();
}
#else
-static inline void play_dead(void)
+void play_dead(void)
{
BUG();
}
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 8248dc0..7512044 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -86,13 +86,18 @@ void exit_idle(void)
return;
__exit_idle();
}
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define play_dead native_play_dead
+#endif
#ifdef CONFIG_HOTPLUG_CPU
DECLARE_PER_CPU(int, cpu_state);
#include <linux/nmi.h>
/* We halt the CPU with physical CPU hotplug */
-static inline void play_dead(void)
+void native_play_dead(void)
{
idle_task_exit();
mb();
@@ -104,7 +109,7 @@ static inline void play_dead(void)
wbinvd_halt();
}
#else
-static inline void play_dead(void)
+void native_play_dead(void)
{
BUG();
}
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index eea2fd6..2a555a1 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1340,7 +1340,7 @@ static void __ref remove_cpu_from_maps(int cpu)
numa_remove_cpu(cpu);
}
-int __cpu_disable(void)
+int native_cpu_disable(void)
{
int cpu = smp_processor_id();
@@ -1379,7 +1379,7 @@ int __cpu_disable(void)
return 0;
}
-void __cpu_die(unsigned int cpu)
+void native_cpu_die(unsigned int cpu)
{
/* We don't do anything here: idle task is faking death itself. */
unsigned int i;
@@ -1397,12 +1397,12 @@ void __cpu_die(unsigned int cpu)
printk(KERN_ERR "CPU %u didn't die...\n", cpu);
}
#else /* ... !CONFIG_HOTPLUG_CPU */
-int __cpu_disable(void)
+int native_cpu_disable(void)
{
return -ENOSYS;
}
-void __cpu_die(unsigned int cpu)
+void native_cpu_die(unsigned int cpu)
{
/* We said "no" in __cpu_disable */
BUG();
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index eca8c4f..fd922c3 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -332,6 +332,12 @@ struct pv_lock_ops {
void (*spin_unlock)(struct raw_spinlock *lock);
};
+struct pv_hotplug_ops {
+ void (*play_dead)(void);
+ int (*cpu_disable)(void);
+ void (*cpu_die)(unsigned int);
+};
+
/* This contains all the paravirt structures: we get a convenient
* number for each function using the offset which we use to indicate
* what to patch. */
@@ -343,6 +349,7 @@ struct paravirt_patch_template {
struct pv_apic_ops pv_apic_ops;
struct pv_mmu_ops pv_mmu_ops;
struct pv_lock_ops pv_lock_ops;
+ struct pv_hotplug_ops pv_hotplug_ops;
};
extern struct pv_info pv_info;
@@ -353,6 +360,7 @@ extern struct pv_irq_ops pv_irq_ops;
extern struct pv_apic_ops pv_apic_ops;
extern struct pv_mmu_ops pv_mmu_ops;
extern struct pv_lock_ops pv_lock_ops;
+extern struct pv_hotplug_ops pv_hotplug_ops;
#define PARAVIRT_PATCH(x) \
(offsetof(struct paravirt_patch_template, x) / sizeof(void *))
@@ -1408,6 +1416,25 @@ static __always_inline void __raw_spin_unlock(struct raw_spinlock *lock)
#endif
+#ifdef CONFIG_HOTPLUG_CPU
+
+static inline int __cpu_disable(void)
+{
+ return PVOP_CALL0(int, pv_hotplug_ops.cpu_disable);
+}
+
+static inline void __cpu_die(unsigned int cpu)
+{
+ PVOP_VCALL1(pv_hotplug_ops.cpu_die, cpu);
+}
+
+static inline void play_dead(void)
+{
+ PVOP_VCALL0(pv_hotplug_ops.play_dead);
+}
+
+#endif
+
/* These all sit in the .parainstructions section to tell us what to patch. */
struct paravirt_patch_site {
u8 *instr; /* original instructions */
diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
index 29324c1..f7d153f 100644
--- a/include/asm-x86/smp.h
+++ b/include/asm-x86/smp.h
@@ -113,11 +113,20 @@ void native_smp_prepare_boot_cpu(void);
void native_smp_prepare_cpus(unsigned int max_cpus);
void native_smp_cpus_done(unsigned int max_cpus);
int native_cpu_up(unsigned int cpunum);
+int native_cpu_disable(void);
+void native_cpu_die(unsigned int cpu);
+void native_play_dead(void);
+
void native_send_call_func_ipi(cpumask_t mask);
void native_send_call_func_single_ipi(int cpu);
-extern int __cpu_disable(void);
-extern void __cpu_die(unsigned int cpu);
+
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define __cpu_disable native_cpu_disable
+#define __cpu_die native_cpu_die
+#endif
void smp_store_cpu_info(int id);
#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)
--
1.5.4.3
--
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