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Marc Zyngier
abcee5fb0d
This adds a 'struct smp_operations' to abstract the CPU initialization and hot plugging functions on SMP systems, which otherwise conflict in a multiplatform kernel. This also helps shmobile and potentially others that have more than one method to do these. To allow the kernel to continue building, the platform hooks are defined as weak symbols which are overrided by the platform code. Once all platforms are converted, the "weak" attribute will be removed and the function made static. Unlike the original version from Marc, this new version from Arnd does not use a generalized abstraction for per-soc data structures but only tries to solve the problem for the SMP operations. This way, we can collapse the previous four data structures into a single struct, which is less systematic but also easier to follow as a causal reader. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
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* arch/arm/include/asm/smp.h
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*
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* Copyright (C) 2004-2005 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_SMP_H
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#define __ASM_ARM_SMP_H
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/thread_info.h>
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#ifndef CONFIG_SMP
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# error "<asm/smp.h> included in non-SMP build"
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#endif
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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struct seq_file;
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/*
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* generate IPI list text
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*/
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extern void show_ipi_list(struct seq_file *, int);
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/*
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* Called from assembly code, this handles an IPI.
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*/
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asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
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/*
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* Called from C code, this handles an IPI.
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*/
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void handle_IPI(int ipinr, struct pt_regs *regs);
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/*
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* Setup the set of possible CPUs (via set_cpu_possible)
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*/
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extern void smp_init_cpus(void);
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/*
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* Provide a function to raise an IPI cross call on CPUs in callmap.
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*/
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extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
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/*
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* Boot a secondary CPU, and assign it the specified idle task.
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* This also gives us the initial stack to use for this CPU.
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*/
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extern int boot_secondary(unsigned int cpu, struct task_struct *);
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/*
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* Called from platform specific assembly code, this is the
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* secondary CPU entry point.
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*/
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asmlinkage void secondary_start_kernel(void);
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/*
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* Perform platform specific initialisation of the specified CPU.
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*/
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extern void platform_secondary_init(unsigned int cpu);
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/*
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* Initialize cpu_possible map, and enable coherency
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*/
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extern void platform_smp_prepare_cpus(unsigned int);
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/*
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* Initial data for bringing up a secondary CPU.
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*/
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struct secondary_data {
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unsigned long pgdir;
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unsigned long swapper_pg_dir;
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void *stack;
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};
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extern struct secondary_data secondary_data;
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extern int __cpu_disable(void);
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extern int platform_cpu_disable(unsigned int cpu);
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extern void __cpu_die(unsigned int cpu);
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extern void cpu_die(void);
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extern void platform_cpu_die(unsigned int cpu);
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extern int platform_cpu_kill(unsigned int cpu);
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extern void platform_cpu_enable(unsigned int cpu);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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struct smp_operations {
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#ifdef CONFIG_SMP
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/*
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* Setup the set of possible CPUs (via set_cpu_possible)
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*/
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void (*smp_init_cpus)(void);
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/*
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* Initialize cpu_possible map, and enable coherency
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*/
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void (*smp_prepare_cpus)(unsigned int max_cpus);
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/*
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* Perform platform specific initialisation of the specified CPU.
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*/
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void (*smp_secondary_init)(unsigned int cpu);
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/*
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* Boot a secondary CPU, and assign it the specified idle task.
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* This also gives us the initial stack to use for this CPU.
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*/
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int (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
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#ifdef CONFIG_HOTPLUG_CPU
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int (*cpu_kill)(unsigned int cpu);
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void (*cpu_die)(unsigned int cpu);
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int (*cpu_disable)(unsigned int cpu);
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#endif
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#endif
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};
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/*
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* set platform specific SMP operations
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*/
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extern void smp_set_ops(struct smp_operations *);
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#endif /* ifndef __ASM_ARM_SMP_H */
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