88b3aac622
Add relevant code to __cpu_die() and __cpu_disable() to finally enable the CPU hotplugging features. Reset the irq count values in smp_callin() to zero before bringing up the CPU. It seems that the firmware may need up to 8 seconds to fully stop a CPU in which no other PDC calls are allowed to be made. Use a timeout __cpu_die() to accommodate for this. Use "chcpu -d 1" to bring CPU1 down, and "chcpu -e 1" to bring it up. Signed-off-by: Helge Deller <deller@gmx.de>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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extern int init_per_cpu(int cpuid);
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#if defined(CONFIG_SMP)
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/* Page Zero Location PDC will look for the address to branch to when we poke
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** slave CPUs still in "Icache loop".
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*/
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#define PDC_OS_BOOT_RENDEZVOUS 0x10
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#define PDC_OS_BOOT_RENDEZVOUS_HI 0x28
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#ifndef ASSEMBLY
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#include <linux/bitops.h>
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#include <linux/threads.h> /* for NR_CPUS */
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#include <linux/cpumask.h>
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typedef unsigned long address_t;
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/*
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* Private routines/data
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*
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* physical and logical are equivalent until we support CPU hotplug.
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*/
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#define cpu_number_map(cpu) (cpu)
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#define cpu_logical_map(cpu) (cpu)
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extern void smp_send_all_nop(void);
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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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#define raw_smp_processor_id() (current_thread_info()->cpu)
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#endif /* !ASSEMBLY */
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#else /* CONFIG_SMP */
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static inline void smp_send_all_nop(void) { return; }
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#endif
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#define ANY_PROC_ID 0xFF /* Any processor magic marker */
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int __cpu_disable(void);
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void __cpu_die(unsigned int cpu);
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#endif /* __ASM_SMP_H */
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