39c715b717
This patch implements a number of smp_processor_id() cleanup ideas that
Arjan van de Ven and I came up with.
The previous __smp_processor_id/_smp_processor_id/smp_processor_id API
spaghetti was hard to follow both on the implementational and on the
usage side.
Some of the complexity arose from picking wrong names, some of the
complexity comes from the fact that not all architectures defined
__smp_processor_id.
In the new code, there are two externally visible symbols:
- smp_processor_id(): debug variant.
- raw_smp_processor_id(): nondebug variant. Replaces all existing
uses of _smp_processor_id() and __smp_processor_id(). Defined
by every SMP architecture in include/asm-*/smp.h.
There is one new internal symbol, dependent on DEBUG_PREEMPT:
- debug_smp_processor_id(): internal debug variant, mapped to
smp_processor_id().
Also, i moved debug_smp_processor_id() from lib/kernel_lock.c into a new
lib/smp_processor_id.c file. All related comments got updated and/or
clarified.
I have build/boot tested the following 8 .config combinations on x86:
{SMP,UP} x {PREEMPT,!PREEMPT} x {DEBUG_PREEMPT,!DEBUG_PREEMPT}
I have also build/boot tested x64 on UP/PREEMPT/DEBUG_PREEMPT. (Other
architectures are untested, but should work just fine.)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
177 lines
4.9 KiB
C
177 lines
4.9 KiB
C
/* smp.h: Sparc specific SMP stuff.
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*
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* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef _SPARC_SMP_H
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#define _SPARC_SMP_H
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#include <linux/config.h>
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#include <linux/threads.h>
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#include <asm/head.h>
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#include <asm/btfixup.h>
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#ifndef __ASSEMBLY__
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#include <linux/cpumask.h>
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#endif /* __ASSEMBLY__ */
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#ifdef CONFIG_SMP
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#ifndef __ASSEMBLY__
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#include <asm/ptrace.h>
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#include <asm/asi.h>
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#include <asm/atomic.h>
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/*
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* Private routines/data
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*/
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extern unsigned char boot_cpu_id;
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extern cpumask_t phys_cpu_present_map;
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#define cpu_possible_map phys_cpu_present_map
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typedef void (*smpfunc_t)(unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long);
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/*
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* General functions that each host system must provide.
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*/
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void sun4m_init_smp(void);
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void sun4d_init_smp(void);
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void smp_callin(void);
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void smp_boot_cpus(void);
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void smp_store_cpu_info(int);
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struct seq_file;
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void smp_bogo(struct seq_file *);
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void smp_info(struct seq_file *);
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BTFIXUPDEF_CALL(void, smp_cross_call, smpfunc_t, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long)
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BTFIXUPDEF_CALL(void, smp_message_pass, int, int, unsigned long, int)
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BTFIXUPDEF_CALL(int, __hard_smp_processor_id, void)
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BTFIXUPDEF_BLACKBOX(hard_smp_processor_id)
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BTFIXUPDEF_BLACKBOX(load_current)
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#define smp_cross_call(func,arg1,arg2,arg3,arg4,arg5) BTFIXUP_CALL(smp_cross_call)(func,arg1,arg2,arg3,arg4,arg5)
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#define smp_message_pass(target,msg,data,wait) BTFIXUP_CALL(smp_message_pass)(target,msg,data,wait)
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extern __inline__ void xc0(smpfunc_t func) { smp_cross_call(func, 0, 0, 0, 0, 0); }
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extern __inline__ void xc1(smpfunc_t func, unsigned long arg1)
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{ smp_cross_call(func, arg1, 0, 0, 0, 0); }
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extern __inline__ void xc2(smpfunc_t func, unsigned long arg1, unsigned long arg2)
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{ smp_cross_call(func, arg1, arg2, 0, 0, 0); }
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extern __inline__ void xc3(smpfunc_t func, unsigned long arg1, unsigned long arg2,
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unsigned long arg3)
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{ smp_cross_call(func, arg1, arg2, arg3, 0, 0); }
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extern __inline__ void xc4(smpfunc_t func, unsigned long arg1, unsigned long arg2,
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unsigned long arg3, unsigned long arg4)
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{ smp_cross_call(func, arg1, arg2, arg3, arg4, 0); }
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extern __inline__ void xc5(smpfunc_t func, unsigned long arg1, unsigned long arg2,
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unsigned long arg3, unsigned long arg4, unsigned long arg5)
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{ smp_cross_call(func, arg1, arg2, arg3, arg4, arg5); }
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extern __inline__ int smp_call_function(void (*func)(void *info), void *info, int nonatomic, int wait)
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{
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xc1((smpfunc_t)func, (unsigned long)info);
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return 0;
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}
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extern __volatile__ int __cpu_number_map[NR_CPUS];
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extern __volatile__ int __cpu_logical_map[NR_CPUS];
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extern __inline__ int cpu_logical_map(int cpu)
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{
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return __cpu_logical_map[cpu];
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}
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extern __inline__ int cpu_number_map(int cpu)
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{
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return __cpu_number_map[cpu];
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}
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extern __inline__ int hard_smp4m_processor_id(void)
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{
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int cpuid;
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__asm__ __volatile__("rd %%tbr, %0\n\t"
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"srl %0, 12, %0\n\t"
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"and %0, 3, %0\n\t" :
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"=&r" (cpuid));
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return cpuid;
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}
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extern __inline__ int hard_smp4d_processor_id(void)
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{
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int cpuid;
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__asm__ __volatile__("lda [%%g0] %1, %0\n\t" :
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"=&r" (cpuid) : "i" (ASI_M_VIKING_TMP1));
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return cpuid;
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}
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#ifndef MODULE
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extern __inline__ int hard_smp_processor_id(void)
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{
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int cpuid;
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/* Black box - sun4m
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__asm__ __volatile__("rd %%tbr, %0\n\t"
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"srl %0, 12, %0\n\t"
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"and %0, 3, %0\n\t" :
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"=&r" (cpuid));
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- sun4d
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__asm__ __volatile__("lda [%g0] ASI_M_VIKING_TMP1, %0\n\t"
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"nop; nop" :
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"=&r" (cpuid));
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See btfixup.h and btfixupprep.c to understand how a blackbox works.
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*/
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__asm__ __volatile__("sethi %%hi(___b_hard_smp_processor_id), %0\n\t"
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"sethi %%hi(boot_cpu_id), %0\n\t"
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"ldub [%0 + %%lo(boot_cpu_id)], %0\n\t" :
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"=&r" (cpuid));
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return cpuid;
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}
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#else
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extern __inline__ int hard_smp_processor_id(void)
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{
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int cpuid;
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__asm__ __volatile__("mov %%o7, %%g1\n\t"
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"call ___f___hard_smp_processor_id\n\t"
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" nop\n\t"
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"mov %%g2, %0\n\t" : "=r"(cpuid) : : "g1", "g2");
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return cpuid;
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}
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#endif
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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#define prof_multiplier(__cpu) cpu_data(__cpu).multiplier
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#define prof_counter(__cpu) cpu_data(__cpu).counter
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#endif /* !(__ASSEMBLY__) */
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/* Sparc specific messages. */
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#define MSG_CROSS_CALL 0x0005 /* run func on cpus */
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/* Empirical PROM processor mailbox constants. If the per-cpu mailbox
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* contains something other than one of these then the ipi is from
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* Linux's active_kernel_processor. This facility exists so that
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* the boot monitor can capture all the other cpus when one catches
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* a watchdog reset or the user enters the monitor using L1-A keys.
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*/
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#define MBOX_STOPCPU 0xFB
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#define MBOX_IDLECPU 0xFC
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#define MBOX_IDLECPU2 0xFD
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#define MBOX_STOPCPU2 0xFE
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#endif /* SMP */
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#define NO_PROC_ID 0xFF
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#endif /* !(_SPARC_SMP_H) */
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