forked from Minki/linux
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>
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/*
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* SMP Support
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*
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
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* (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#ifndef _ASM_IA64_SMP_H
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#define _ASM_IA64_SMP_H
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <linux/kernel.h>
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#include <linux/cpumask.h>
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#include <asm/bitops.h>
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#include <asm/io.h>
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#include <asm/param.h>
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#include <asm/processor.h>
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#include <asm/ptrace.h>
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static inline unsigned int
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ia64_get_lid (void)
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{
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union {
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struct {
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unsigned long reserved : 16;
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unsigned long eid : 8;
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unsigned long id : 8;
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unsigned long ignored : 32;
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} f;
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unsigned long bits;
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} lid;
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lid.bits = ia64_getreg(_IA64_REG_CR_LID);
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return lid.f.id << 8 | lid.f.eid;
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}
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#ifdef CONFIG_SMP
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#define XTP_OFFSET 0x1e0008
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#define SMP_IRQ_REDIRECTION (1 << 0)
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#define SMP_IPI_REDIRECTION (1 << 1)
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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extern struct smp_boot_data {
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int cpu_count;
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int cpu_phys_id[NR_CPUS];
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} smp_boot_data __initdata;
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extern char no_int_routing __devinitdata;
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extern cpumask_t cpu_online_map;
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extern cpumask_t cpu_core_map[NR_CPUS];
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extern cpumask_t cpu_sibling_map[NR_CPUS];
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extern int smp_num_siblings;
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extern int smp_num_cpucores;
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extern void __iomem *ipi_base_addr;
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extern unsigned char smp_int_redirect;
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extern volatile int ia64_cpu_to_sapicid[];
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#define cpu_physical_id(i) ia64_cpu_to_sapicid[i]
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extern unsigned long ap_wakeup_vector;
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/*
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* Function to map hard smp processor id to logical id. Slow, so don't use this in
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* performance-critical code.
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*/
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static inline int
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cpu_logical_id (int cpuid)
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{
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int i;
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for (i = 0; i < NR_CPUS; ++i)
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if (cpu_physical_id(i) == cpuid)
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break;
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return i;
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}
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/*
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* XTP control functions:
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* min_xtp : route all interrupts to this CPU
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* normal_xtp: nominal XTP value
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* max_xtp : never deliver interrupts to this CPU.
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*/
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static inline void
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min_xtp (void)
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{
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if (smp_int_redirect & SMP_IRQ_REDIRECTION)
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writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
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}
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static inline void
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normal_xtp (void)
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{
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if (smp_int_redirect & SMP_IRQ_REDIRECTION)
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writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
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}
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static inline void
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max_xtp (void)
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{
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if (smp_int_redirect & SMP_IRQ_REDIRECTION)
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writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
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}
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#define hard_smp_processor_id() ia64_get_lid()
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/* Upping and downing of CPUs */
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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 cpu_die (void) __attribute__ ((noreturn));
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extern int __cpu_up (unsigned int cpu);
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extern void __init smp_build_cpu_map(void);
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extern void __init init_smp_config (void);
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extern void smp_do_timer (struct pt_regs *regs);
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extern int smp_call_function_single (int cpuid, void (*func) (void *info), void *info,
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int retry, int wait);
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extern void smp_send_reschedule (int cpu);
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extern void lock_ipi_calllock(void);
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extern void unlock_ipi_calllock(void);
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extern void identify_siblings (struct cpuinfo_ia64 *);
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#else
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#define cpu_logical_id(i) 0
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#define cpu_physical_id(i) ia64_get_lid()
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#endif /* CONFIG_SMP */
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#endif /* _ASM_IA64_SMP_H */
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