dd988528f4
hard_smp_processor_id used to be just a macro that hard-coded hard_smp_processor_id to 0 in the non SMP case. When booting non SMP kernels on hardware where the boot ioapic id is not 0 this turns out to be a problem. This is happens frequently in the case of kdump and once in a great while in the case of real hardware. Use the APIC to determine the hardware processor id in both UP and SMP kernels to fix this issue. Notice that hard_smp_processor_id is only used by SMP code or by code that works with apics so we do not need to handle the case when apics are not present and hard_smp_processor_id should never be called there. Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Acked-by: Andi Kleen <ak@suse.de> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
#ifndef __ASM_SMP_H
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#define __ASM_SMP_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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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/bitops.h>
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#include <linux/init.h>
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extern int disable_apic;
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#include <asm/mpspec.h>
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#include <asm/apic.h>
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#include <asm/io_apic.h>
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#include <asm/thread_info.h>
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#ifdef CONFIG_SMP
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#include <asm/pda.h>
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struct pt_regs;
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extern cpumask_t cpu_present_mask;
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extern cpumask_t cpu_possible_map;
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extern cpumask_t cpu_online_map;
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extern cpumask_t cpu_callout_map;
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extern cpumask_t cpu_initialized;
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/*
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* Private routines/data
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*/
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extern void smp_alloc_memory(void);
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extern volatile unsigned long smp_invalidate_needed;
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extern void lock_ipi_call_lock(void);
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extern void unlock_ipi_call_lock(void);
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extern int smp_num_siblings;
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extern void smp_send_reschedule(int cpu);
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extern cpumask_t cpu_sibling_map[NR_CPUS];
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extern cpumask_t cpu_core_map[NR_CPUS];
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extern u8 cpu_llc_id[NR_CPUS];
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#define SMP_TRAMPOLINE_BASE 0x6000
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/*
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* On x86 all CPUs are mapped 1:1 to the APIC space.
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* This simplifies scheduling and IPI sending and
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* compresses data structures.
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*/
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static inline int num_booting_cpus(void)
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{
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return cpus_weight(cpu_callout_map);
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}
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#define raw_smp_processor_id() read_pda(cpunumber)
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern void prefill_possible_map(void);
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extern unsigned num_processors;
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extern unsigned __cpuinitdata disabled_cpus;
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#endif /* CONFIG_SMP */
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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 GET_APIC_ID(*(unsigned int *)(APIC_BASE+APIC_ID));
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}
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/*
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* Some lowlevel functions might want to know about
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* the real APIC ID <-> CPU # mapping.
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*/
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extern u8 x86_cpu_to_apicid[NR_CPUS]; /* physical ID */
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extern u8 x86_cpu_to_log_apicid[NR_CPUS];
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extern u8 bios_cpu_apicid[];
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static inline int cpu_present_to_apicid(int mps_cpu)
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{
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if (mps_cpu < NR_CPUS)
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return (int)bios_cpu_apicid[mps_cpu];
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else
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return BAD_APICID;
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}
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#ifndef CONFIG_SMP
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#define stack_smp_processor_id() 0
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#define cpu_logical_map(x) (x)
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#else
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#include <asm/thread_info.h>
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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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#endif
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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(*(unsigned long *)(APIC_BASE+APIC_LDR));
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}
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#ifdef CONFIG_SMP
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#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu]
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#else
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#define cpu_physical_id(cpu) boot_cpu_id
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#endif /* !CONFIG_SMP */
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#endif
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