i386: move common parts of smp into their own file
Several parts of kernel/smp.c and smpboot.c are generally useful for other subarchitectures and paravirt_ops implementations, so make them available for reuse. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Acked-by: Chris Wright <chrisw@sous-sol.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -19,6 +19,7 @@ obj-$(CONFIG_X86_CPUID) += cpuid.o
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obj-$(CONFIG_MICROCODE) += microcode.o
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obj-$(CONFIG_APM) += apm.o
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obj-$(CONFIG_X86_SMP) += smp.o smpboot.o tsc_sync.o
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obj-$(CONFIG_SMP) += smpcommon.o
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obj-$(CONFIG_X86_TRAMPOLINE) += trampoline.o
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obj-$(CONFIG_X86_MPPARSE) += mpparse.o
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obj-$(CONFIG_X86_LOCAL_APIC) += apic.o nmi.o
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@ -467,7 +467,7 @@ void flush_tlb_all(void)
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* it goes straight through and wastes no time serializing
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* anything. Worst case is that we lose a reschedule ...
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*/
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void native_smp_send_reschedule(int cpu)
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static void native_smp_send_reschedule(int cpu)
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{
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WARN_ON(cpu_is_offline(cpu));
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send_IPI_mask(cpumask_of_cpu(cpu), RESCHEDULE_VECTOR);
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@ -546,9 +546,10 @@ static void __smp_call_function(void (*func) (void *info), void *info,
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* You must not call this function with disabled interrupts or from a
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* hardware interrupt handler or from a bottom half handler.
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*/
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int native_smp_call_function_mask(cpumask_t mask,
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void (*func)(void *), void *info,
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int wait)
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static int
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native_smp_call_function_mask(cpumask_t mask,
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void (*func)(void *), void *info,
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int wait)
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{
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struct call_data_struct data;
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cpumask_t allbutself;
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@ -599,60 +600,6 @@ int native_smp_call_function_mask(cpumask_t mask,
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return 0;
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}
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/**
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* smp_call_function(): Run a function on all other CPUs.
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* @func: The function to run. This must be fast and non-blocking.
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* @info: An arbitrary pointer to pass to the function.
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* @nonatomic: Unused.
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* @wait: If true, wait (atomically) until function has completed on other CPUs.
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*
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* Returns 0 on success, else a negative status code.
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*
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* If @wait is true, then returns once @func has returned; otherwise
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* it returns just before the target cpu calls @func.
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*
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* You must not call this function with disabled interrupts or from a
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* hardware interrupt handler or from a bottom half handler.
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*/
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int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
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int wait)
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{
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return smp_call_function_mask(cpu_online_map, func, info, wait);
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}
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EXPORT_SYMBOL(smp_call_function);
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/**
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* smp_call_function_single - Run a function on another CPU
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* @cpu: The target CPU. Cannot be the calling CPU.
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* @func: The function to run. This must be fast and non-blocking.
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* @info: An arbitrary pointer to pass to the function.
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* @nonatomic: Unused.
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* @wait: If true, wait until function has completed on other CPUs.
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*
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* Returns 0 on success, else a negative status code.
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*
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* If @wait is true, then returns once @func has returned; otherwise
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* it returns just before the target cpu calls @func.
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*/
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int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
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int nonatomic, int wait)
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{
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/* prevent preemption and reschedule on another processor */
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int ret;
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int me = get_cpu();
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if (cpu == me) {
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WARN_ON(1);
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put_cpu();
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return -EBUSY;
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}
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ret = smp_call_function_mask(cpumask_of_cpu(cpu), func, info, wait);
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put_cpu();
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return ret;
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}
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EXPORT_SYMBOL(smp_call_function_single);
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static void stop_this_cpu (void * dummy)
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{
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local_irq_disable();
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@ -670,7 +617,7 @@ static void stop_this_cpu (void * dummy)
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* this function calls the 'stop' function on all other CPUs in the system.
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*/
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void native_smp_send_stop(void)
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static void native_smp_send_stop(void)
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{
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/* Don't deadlock on the call lock in panic */
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int nolock = !spin_trylock(&call_lock);
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@ -98,9 +98,6 @@ EXPORT_SYMBOL(x86_cpu_to_apicid);
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u8 apicid_2_node[MAX_APICID];
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DEFINE_PER_CPU(unsigned long, this_cpu_off);
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EXPORT_PER_CPU_SYMBOL(this_cpu_off);
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/*
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* Trampoline 80x86 program as an array.
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*/
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@ -763,25 +760,6 @@ static inline struct task_struct * alloc_idle_task(int cpu)
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#define alloc_idle_task(cpu) fork_idle(cpu)
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#endif
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/* Initialize the CPU's GDT. This is either the boot CPU doing itself
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(still using the master per-cpu area), or a CPU doing it for a
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secondary which will soon come up. */
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static __cpuinit void init_gdt(int cpu)
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{
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struct desc_struct *gdt = get_cpu_gdt_table(cpu);
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pack_descriptor((u32 *)&gdt[GDT_ENTRY_PERCPU].a,
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(u32 *)&gdt[GDT_ENTRY_PERCPU].b,
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__per_cpu_offset[cpu], 0xFFFFF,
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0x80 | DESCTYPE_S | 0x2, 0x8);
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per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
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per_cpu(cpu_number, cpu) = cpu;
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}
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/* Defined in head.S */
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extern struct Xgt_desc_struct early_gdt_descr;
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static int __cpuinit do_boot_cpu(int apicid, int cpu)
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/*
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* NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
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79
arch/i386/kernel/smpcommon.c
Normal file
79
arch/i386/kernel/smpcommon.c
Normal file
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@ -0,0 +1,79 @@
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/*
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* SMP stuff which is common to all sub-architectures.
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*/
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#include <linux/module.h>
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#include <asm/smp.h>
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DEFINE_PER_CPU(unsigned long, this_cpu_off);
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EXPORT_PER_CPU_SYMBOL(this_cpu_off);
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/* Initialize the CPU's GDT. This is either the boot CPU doing itself
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(still using the master per-cpu area), or a CPU doing it for a
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secondary which will soon come up. */
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__cpuinit void init_gdt(int cpu)
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{
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struct desc_struct *gdt = get_cpu_gdt_table(cpu);
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pack_descriptor((u32 *)&gdt[GDT_ENTRY_PERCPU].a,
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(u32 *)&gdt[GDT_ENTRY_PERCPU].b,
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__per_cpu_offset[cpu], 0xFFFFF,
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0x80 | DESCTYPE_S | 0x2, 0x8);
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per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
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per_cpu(cpu_number, cpu) = cpu;
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}
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/**
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* smp_call_function(): Run a function on all other CPUs.
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* @func: The function to run. This must be fast and non-blocking.
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* @info: An arbitrary pointer to pass to the function.
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* @nonatomic: Unused.
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* @wait: If true, wait (atomically) until function has completed on other CPUs.
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*
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* Returns 0 on success, else a negative status code.
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*
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* If @wait is true, then returns once @func has returned; otherwise
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* it returns just before the target cpu calls @func.
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*
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* You must not call this function with disabled interrupts or from a
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* hardware interrupt handler or from a bottom half handler.
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*/
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int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
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int wait)
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{
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return smp_call_function_mask(cpu_online_map, func, info, wait);
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}
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EXPORT_SYMBOL(smp_call_function);
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/**
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* smp_call_function_single - Run a function on another CPU
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* @cpu: The target CPU. Cannot be the calling CPU.
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* @func: The function to run. This must be fast and non-blocking.
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* @info: An arbitrary pointer to pass to the function.
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* @nonatomic: Unused.
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* @wait: If true, wait until function has completed on other CPUs.
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*
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* Returns 0 on success, else a negative status code.
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*
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* If @wait is true, then returns once @func has returned; otherwise
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* it returns just before the target cpu calls @func.
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*/
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int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
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int nonatomic, int wait)
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{
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/* prevent preemption and reschedule on another processor */
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int ret;
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int me = get_cpu();
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if (cpu == me) {
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WARN_ON(1);
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put_cpu();
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return -EBUSY;
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}
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ret = smp_call_function_mask(cpumask_of_cpu(cpu), func, info, wait);
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put_cpu();
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return ret;
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}
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EXPORT_SYMBOL(smp_call_function_single);
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@ -749,9 +749,13 @@ extern unsigned long boot_option_idle_override;
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extern void enable_sep_cpu(void);
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extern int sysenter_setup(void);
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/* Defined in head.S */
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extern struct Xgt_desc_struct early_gdt_descr;
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extern void cpu_set_gdt(int);
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extern void switch_to_new_gdt(void);
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extern void cpu_init(void);
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extern void init_gdt(int cpu);
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extern int force_mwait;
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