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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4df20460a3
We currently have a hack to flip the boot cpu and its secondary thread to logical cpuid 0 and 1. This means the logical - physical mapping will differ depending on which cpu is boot cpu. This is most apparent on kexec, where we might kexec on any cpu and therefore change the mapping from boot to boot. The patch below does a first pass early on to work out the logical cpuid of the boot thread. We then fix up some paca structures to match. Ive also removed the boot_cpuid_phys variable for ppc64, to be consistent we use get_hard_smp_processor_id(boot_cpuid) everywhere. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
/*
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* smp.h: PowerPC-specific SMP code.
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*
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* Original was a copy of sparc smp.h. Now heavily modified
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* for PPC.
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*
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* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996-2001 Cort Dougan <cort@fsmlabs.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_POWERPC_SMP_H
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#define _ASM_POWERPC_SMP_H
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#ifdef __KERNEL__
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#include <linux/config.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/kernel.h>
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_PPC64
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#include <asm/paca.h>
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#endif
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extern int boot_cpuid;
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extern void cpu_die(void);
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#ifdef CONFIG_SMP
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extern void smp_send_debugger_break(int cpu);
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struct pt_regs;
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extern void smp_message_recv(int, struct pt_regs *);
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#ifdef CONFIG_HOTPLUG_CPU
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extern void fixup_irqs(cpumask_t map);
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int generic_cpu_disable(void);
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int generic_cpu_enable(unsigned int cpu);
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void generic_cpu_die(unsigned int cpu);
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void generic_mach_cpu_die(void);
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#endif
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#ifdef CONFIG_PPC64
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#define raw_smp_processor_id() (get_paca()->paca_index)
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#define hard_smp_processor_id() (get_paca()->hw_cpu_id)
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#else
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/* 32-bit */
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extern int smp_hw_index[];
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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#define hard_smp_processor_id() (smp_hw_index[smp_processor_id()])
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#define get_hard_smp_processor_id(cpu) (smp_hw_index[(cpu)])
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#define set_hard_smp_processor_id(cpu, phys)\
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(smp_hw_index[(cpu)] = (phys))
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#endif
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extern cpumask_t cpu_sibling_map[NR_CPUS];
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/* Since OpenPIC has only 4 IPIs, we use slightly different message numbers.
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*
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* Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up
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* in /proc/interrupts will be wrong!!! --Troy */
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#define PPC_MSG_CALL_FUNCTION 0
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#define PPC_MSG_RESCHEDULE 1
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/* This is unused now */
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#if 0
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#define PPC_MSG_MIGRATE_TASK 2
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#endif
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#define PPC_MSG_DEBUGGER_BREAK 3
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void smp_init_iSeries(void);
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void smp_init_pSeries(void);
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void smp_init_cell(void);
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void smp_setup_cpu_maps(void);
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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#else
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/* for UP */
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#define smp_setup_cpu_maps()
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_PPC64
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#define get_hard_smp_processor_id(CPU) (paca[(CPU)].hw_cpu_id)
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#define set_hard_smp_processor_id(CPU, VAL) \
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do { (paca[(CPU)].hw_cpu_id = (VAL)); } while (0)
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extern void smp_release_cpus(void);
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#else
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/* 32-bit */
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#ifndef CONFIG_SMP
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extern int boot_cpuid_phys;
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#define get_hard_smp_processor_id(cpu) boot_cpuid_phys
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#define set_hard_smp_processor_id(cpu, phys)
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#endif
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#endif
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extern int smt_enabled_at_boot;
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extern int smp_mpic_probe(void);
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extern void smp_mpic_setup_cpu(int cpu);
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extern void smp_generic_kick_cpu(int nr);
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extern void smp_generic_give_timebase(void);
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extern void smp_generic_take_timebase(void);
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extern struct smp_ops_t *smp_ops;
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_SMP_H) */
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