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Date: Thu, 21 Aug 2008 11:19:56 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Alex Nixon <alex.nixon@...rix.com>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 1/7] x86/paravirt: Add hooks for CPU hotplugging
Alex Nixon wrote:
> 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,
>
I think I'd prefer these to be part of smp_ops. We're only talking
about three new operations, and they're the logical compliments of the
existing smp_ops functions for bringing up cpus.
J
> };
> 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)
>
--
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