1a51e3a0ae
[ Based on original patch from Christoph Lameter and Mike Travis. ] Currently pdas and percpu areas are allocated separately. %gs points to local pda and percpu area can be reached using pda->data_offset. This patch folds pda into percpu area. Due to strange gcc requirement, pda needs to be at the beginning of the percpu area so that pda->stack_canary is at %gs:40. To achieve this, a new percpu output section macro - PERCPU_VADDR_PREALLOC() - is added and used to reserve pda sized chunk at the start of the percpu area. After this change, for boot cpu, %gs first points to pda in the data.init area and later during setup_per_cpu_areas() gets updated to point to the actual pda. This means that setup_per_cpu_areas() need to reload %gs for CPU0 while clearing pda area for other cpus as cpu0 already has modified it when control reaches setup_per_cpu_areas(). This patch also removes now unnecessary get_local_pda() and its call sites. A lot of this patch is taken from Mike Travis' "x86_64: Fold pda into per cpu area" patch. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
220 lines
4.9 KiB
C
220 lines
4.9 KiB
C
#ifndef _ASM_X86_SMP_H
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#define _ASM_X86_SMP_H
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#ifndef __ASSEMBLY__
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#include <linux/cpumask.h>
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#include <linux/init.h>
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#include <asm/percpu.h>
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/*
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* We need the APIC definitions automatically as part of 'smp.h'
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*/
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#ifdef CONFIG_X86_LOCAL_APIC
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# include <asm/mpspec.h>
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# include <asm/apic.h>
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# ifdef CONFIG_X86_IO_APIC
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# include <asm/io_apic.h>
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# endif
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#endif
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#include <asm/pda.h>
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#include <asm/thread_info.h>
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#include <asm/cpumask.h>
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extern int smp_num_siblings;
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extern unsigned int num_processors;
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DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
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DECLARE_PER_CPU(cpumask_t, cpu_core_map);
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DECLARE_PER_CPU(u16, cpu_llc_id);
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#ifdef CONFIG_X86_32
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DECLARE_PER_CPU(int, cpu_number);
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#endif
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static inline struct cpumask *cpu_sibling_mask(int cpu)
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{
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return &per_cpu(cpu_sibling_map, cpu);
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}
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static inline struct cpumask *cpu_core_mask(int cpu)
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{
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return &per_cpu(cpu_core_map, cpu);
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}
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DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
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DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
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/* Static state in head.S used to set up a CPU */
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extern struct {
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void *sp;
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unsigned short ss;
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} stack_start;
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struct smp_ops {
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void (*smp_prepare_boot_cpu)(void);
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void (*smp_prepare_cpus)(unsigned max_cpus);
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void (*smp_cpus_done)(unsigned max_cpus);
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void (*smp_send_stop)(void);
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void (*smp_send_reschedule)(int cpu);
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int (*cpu_up)(unsigned cpu);
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int (*cpu_disable)(void);
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void (*cpu_die)(unsigned int cpu);
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void (*play_dead)(void);
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void (*send_call_func_ipi)(const struct cpumask *mask);
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void (*send_call_func_single_ipi)(int cpu);
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};
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/* Globals due to paravirt */
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extern void set_cpu_sibling_map(int cpu);
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#ifdef CONFIG_SMP
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#ifndef CONFIG_PARAVIRT
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#define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)
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#endif
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extern struct smp_ops smp_ops;
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static inline void smp_send_stop(void)
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{
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smp_ops.smp_send_stop();
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}
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static inline void smp_prepare_boot_cpu(void)
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{
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smp_ops.smp_prepare_boot_cpu();
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}
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static inline void smp_prepare_cpus(unsigned int max_cpus)
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{
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smp_ops.smp_prepare_cpus(max_cpus);
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}
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static inline void smp_cpus_done(unsigned int max_cpus)
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{
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smp_ops.smp_cpus_done(max_cpus);
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}
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static inline int __cpu_up(unsigned int cpu)
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{
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return smp_ops.cpu_up(cpu);
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}
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static inline int __cpu_disable(void)
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{
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return smp_ops.cpu_disable();
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}
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static inline void __cpu_die(unsigned int cpu)
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{
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smp_ops.cpu_die(cpu);
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}
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static inline void play_dead(void)
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{
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smp_ops.play_dead();
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}
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static inline void smp_send_reschedule(int cpu)
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{
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smp_ops.smp_send_reschedule(cpu);
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}
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static inline void arch_send_call_function_single_ipi(int cpu)
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{
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smp_ops.send_call_func_single_ipi(cpu);
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}
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static inline void arch_send_call_function_ipi(cpumask_t mask)
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{
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smp_ops.send_call_func_ipi(&mask);
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}
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void cpu_disable_common(void);
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void native_smp_prepare_boot_cpu(void);
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void native_smp_prepare_cpus(unsigned int max_cpus);
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void native_smp_cpus_done(unsigned int max_cpus);
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int native_cpu_up(unsigned int cpunum);
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int native_cpu_disable(void);
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void native_cpu_die(unsigned int cpu);
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void native_play_dead(void);
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void play_dead_common(void);
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void native_send_call_func_ipi(const struct cpumask *mask);
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void native_send_call_func_single_ipi(int cpu);
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void smp_store_cpu_info(int id);
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#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)
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/* We don't mark CPUs online until __cpu_up(), so we need another measure */
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static inline int num_booting_cpus(void)
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{
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return cpumask_weight(cpu_callout_mask);
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}
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#endif /* CONFIG_SMP */
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extern unsigned disabled_cpus __cpuinitdata;
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#ifdef CONFIG_X86_32_SMP
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/*
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* This function is needed by all SMP systems. It must _always_ be valid
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* from the initial startup. We map APIC_BASE very early in page_setup(),
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* so this is correct in the x86 case.
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*/
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#define raw_smp_processor_id() (x86_read_percpu(cpu_number))
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extern int safe_smp_processor_id(void);
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#elif defined(CONFIG_X86_64_SMP)
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#define raw_smp_processor_id() read_pda(cpunumber)
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#define stack_smp_processor_id() \
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({ \
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struct thread_info *ti; \
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__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK)); \
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ti->cpu; \
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})
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#define safe_smp_processor_id() smp_processor_id()
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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#ifndef CONFIG_X86_64
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static inline int logical_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return GET_APIC_LOGICAL_ID(*(u32 *)(APIC_BASE + APIC_LDR));
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}
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#include <mach_apicdef.h>
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static inline unsigned int read_apic_id(void)
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{
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unsigned int reg;
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reg = *(u32 *)(APIC_BASE + APIC_ID);
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return GET_APIC_ID(reg);
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}
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#endif
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# if defined(APIC_DEFINITION) || defined(CONFIG_X86_64)
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extern int hard_smp_processor_id(void);
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# else
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#include <mach_apicdef.h>
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static inline int hard_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return read_apic_id();
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}
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# endif /* APIC_DEFINITION */
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#else /* CONFIG_X86_LOCAL_APIC */
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# ifndef CONFIG_SMP
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# define hard_smp_processor_id() 0
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# endif
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#endif /* CONFIG_X86_LOCAL_APIC */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_SMP_H */
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