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9b6695a8ad
A recent change requires cpu_possible_map to be initialized before
smp_sched_init() but most MIPS platforms were initializing their
processors in the prom_prepare_cpus callback of smp_prepare_cpus. The
simple fix of calling prom_prepare_cpus from one of the earlier SMP
initialization hooks doesn't work well either since IPIs may require
init_IRQ() to have completed, so bit the bullet and split
prom_prepare_cpus into two initialization functions, plat_smp_setup
which is called early from setup_arch and plat_prepare_cpus called where
prom_prepare_cpus used to be called.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
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* Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
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* Copyright (C) 2000, 2001, 2002 Ralf Baechle
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* Copyright (C) 2000, 2001 Broadcom Corporation
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*/
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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#include <linux/config.h>
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#ifdef CONFIG_SMP
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#include <linux/bitops.h>
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#include <linux/linkage.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <asm/atomic.h>
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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/* Map from cpu id to sequential logical cpu number. This will only
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not be idempotent when cpus failed to come on-line. */
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extern int __cpu_number_map[NR_CPUS];
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#define cpu_number_map(cpu) __cpu_number_map[cpu]
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/* The reverse map from sequential logical cpu number to cpu id. */
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extern int __cpu_logical_map[NR_CPUS];
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#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
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#define NO_PROC_ID (-1)
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struct call_data_struct {
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void (*func)(void *);
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void *info;
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atomic_t started;
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atomic_t finished;
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int wait;
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};
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extern struct call_data_struct *call_data;
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#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
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#define SMP_CALL_FUNCTION 0x2
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extern cpumask_t phys_cpu_present_map;
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extern cpumask_t cpu_online_map;
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#define cpu_possible_map phys_cpu_present_map
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extern cpumask_t cpu_callout_map;
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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 cpus_weight(cpu_callout_map);
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}
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/*
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* These are defined by the board-specific code.
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*/
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/*
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* Cause the function described by call_data to be executed on the passed
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* cpu. When the function has finished, increment the finished field of
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* call_data.
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*/
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extern void core_send_ipi(int cpu, unsigned int action);
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/*
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* Firmware CPU startup hook
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*/
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extern void prom_boot_secondary(int cpu, struct task_struct *idle);
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/*
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* After we've done initial boot, this function is called to allow the
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* board code to clean up state, if needed
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*/
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extern void prom_init_secondary(void);
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/*
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* Populate cpu_possible_map before smp_init, called from setup_arch.
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*/
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extern void plat_smp_setup(void);
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/*
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* Called after init_IRQ but before __cpu_up.
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*/
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extern void prom_prepare_cpus(unsigned int max_cpus);
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/*
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* Last chance for the board code to finish SMP initialization before
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* the CPU is "online".
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*/
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extern void prom_smp_finish(void);
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/* Hook for after all CPUs are online */
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extern void prom_cpus_done(void);
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extern void asmlinkage smp_bootstrap(void);
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/*
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* this function sends a 'reschedule' IPI to another CPU.
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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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static inline void smp_send_reschedule(int cpu)
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{
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core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
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}
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extern asmlinkage void smp_call_function_interrupt(void);
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#endif /* CONFIG_SMP */
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#endif /* __ASM_SMP_H */
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