/* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __ASM_ARC_SMP_H #define __ASM_ARC_SMP_H #ifdef CONFIG_SMP #include <linux/types.h> #include <linux/init.h> #include <linux/threads.h> #define raw_smp_processor_id() (current_thread_info()->cpu) /* including cpumask.h leads to cyclic deps hence this Forward declaration */ struct cpumask; /* * APIs provided by arch SMP code to generic code */ extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); /* * APIs provided by arch SMP code to rest of arch code */ extern void __init smp_init_cpus(void); extern void first_lines_of_secondary(void); extern const char *arc_platform_smp_cpuinfo(void); /* * API expected BY platform smp code (FROM arch smp code) * * smp_ipi_irq_setup: * Takes @cpu and @hwirq to which the arch-common ISR is hooked up */ extern int smp_ipi_irq_setup(int cpu, irq_hw_number_t hwirq); /* * struct plat_smp_ops - SMP callbacks provided by platform to ARC SMP * * @info: SoC SMP specific info for /proc/cpuinfo etc * @init_early_smp: A SMP specific h/w block can init itself * Could be common across platforms so not covered by * mach_desc->init_early() * @init_per_cpu: Called for each core so SMP h/w block driver can do * any needed setup per cpu (e.g. IPI request) * @cpu_kick: For Master to kickstart a cpu (optionally at a PC) * @ipi_send: To send IPI to a @cpu * @ips_clear: To clear IPI received at @irq */ struct plat_smp_ops { const char *info; void (*init_early_smp)(void); void (*init_per_cpu)(int cpu); void (*cpu_kick)(int cpu, unsigned long pc); void (*ipi_send)(int cpu); void (*ipi_clear)(int irq); }; /* TBD: stop exporting it for direct population by platform */ extern struct plat_smp_ops plat_smp_ops; #else /* CONFIG_SMP */ static inline void smp_init_cpus(void) {} static inline const char *arc_platform_smp_cpuinfo(void) { return ""; } #endif /* !CONFIG_SMP */ /* * ARC700 doesn't support atomic Read-Modify-Write ops. * Originally Interrupts had to be disabled around code to gaurantee atomicity. * The LLOCK/SCOND insns allow writing interrupt-hassle-free based atomic ops * based on retry-if-irq-in-atomic (with hardware assist). * However despite these, we provide the IRQ disabling variant * * (1) These insn were introduced only in 4.10 release. So for older released * support needed. * * (2) In a SMP setup, the LLOCK/SCOND atomicity across CPUs needs to be * gaurantted by the platform (not something which core handles). * Assuming a platform won't, SMP Linux needs to use spinlocks + local IRQ * disabling for atomicity. * * However exported spinlock API is not usable due to cyclic hdr deps * (even after system.h disintegration upstream) * asm/bitops.h -> linux/spinlock.h -> linux/preempt.h * -> linux/thread_info.h -> linux/bitops.h -> asm/bitops.h * * So the workaround is to use the lowest level arch spinlock API. * The exported spinlock API is smart enough to be NOP for !CONFIG_SMP, * but same is not true for ARCH backend, hence the need for 2 variants */ #ifndef CONFIG_ARC_HAS_LLSC #include <linux/irqflags.h> #ifdef CONFIG_SMP #include <asm/spinlock.h> extern arch_spinlock_t smp_atomic_ops_lock; extern arch_spinlock_t smp_bitops_lock; #define atomic_ops_lock(flags) do { \ local_irq_save(flags); \ arch_spin_lock(&smp_atomic_ops_lock); \ } while (0) #define atomic_ops_unlock(flags) do { \ arch_spin_unlock(&smp_atomic_ops_lock); \ local_irq_restore(flags); \ } while (0) #define bitops_lock(flags) do { \ local_irq_save(flags); \ arch_spin_lock(&smp_bitops_lock); \ } while (0) #define bitops_unlock(flags) do { \ arch_spin_unlock(&smp_bitops_lock); \ local_irq_restore(flags); \ } while (0) #else /* !CONFIG_SMP */ #define atomic_ops_lock(flags) local_irq_save(flags) #define atomic_ops_unlock(flags) local_irq_restore(flags) #define bitops_lock(flags) local_irq_save(flags) #define bitops_unlock(flags) local_irq_restore(flags) #endif /* !CONFIG_SMP */ #endif /* !CONFIG_ARC_HAS_LLSC */ #endif
Name | Type | Size | Permission | Actions |
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Kbuild | File | 681 B | 0644 |
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arcregs.h | File | 8.59 KB | 0644 |
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asm-offsets.h | File | 311 B | 0644 |
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atomic.h | File | 15.14 KB | 0644 |
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barrier.h | File | 1.75 KB | 0644 |
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bitops.h | File | 9.81 KB | 0644 |
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bug.h | File | 938 B | 0644 |
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cache.h | File | 3.77 KB | 0644 |
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cacheflush.h | File | 3.88 KB | 0644 |
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checksum.h | File | 2.45 KB | 0644 |
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cmpxchg.h | File | 5.4 KB | 0644 |
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current.h | File | 695 B | 0644 |
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delay.h | File | 1.99 KB | 0644 |
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disasm.h | File | 3.87 KB | 0644 |
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dma-mapping.h | File | 734 B | 0644 |
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dma.h | File | 459 B | 0644 |
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dwarf.h | File | 892 B | 0644 |
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elf.h | File | 2.15 KB | 0644 |
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entry-arcv2.h | File | 4.85 KB | 0644 |
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entry-compact.h | File | 9.29 KB | 0644 |
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entry.h | File | 6.73 KB | 0644 |
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exec.h | File | 410 B | 0644 |
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fb.h | File | 411 B | 0644 |
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futex.h | File | 3.67 KB | 0644 |
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highmem.h | File | 1.46 KB | 0644 |
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hugepage.h | File | 2.41 KB | 0644 |
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io.h | File | 6.43 KB | 0644 |
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irq.h | File | 825 B | 0644 |
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irqflags-arcv2.h | File | 3.45 KB | 0644 |
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irqflags-compact.h | File | 4.25 KB | 0644 |
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irqflags.h | File | 509 B | 0644 |
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kdebug.h | File | 400 B | 0644 |
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kgdb.h | File | 1.35 KB | 0644 |
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kmap_types.h | File | 489 B | 0644 |
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kprobes.h | File | 1.37 KB | 0644 |
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linkage.h | File | 1.42 KB | 0644 |
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mach_desc.h | File | 2.06 KB | 0644 |
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mmu.h | File | 2.44 KB | 0644 |
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mmu_context.h | File | 5.67 KB | 0644 |
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mmzone.h | File | 989 B | 0644 |
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module.h | File | 661 B | 0644 |
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page.h | File | 2.99 KB | 0644 |
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pci.h | File | 705 B | 0644 |
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perf_event.h | File | 6.86 KB | 0644 |
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pgalloc.h | File | 3.79 KB | 0644 |
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pgtable.h | File | 14.2 KB | 0644 |
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processor.h | File | 4.69 KB | 0644 |
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ptrace.h | File | 3.87 KB | 0644 |
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sections.h | File | 407 B | 0644 |
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segment.h | File | 612 B | 0644 |
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serial.h | File | 644 B | 0644 |
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setup.h | File | 1.18 KB | 0644 |
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shmparam.h | File | 442 B | 0644 |
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smp.h | File | 4.25 KB | 0644 |
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spinlock.h | File | 8.79 KB | 0644 |
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spinlock_types.h | File | 1.03 KB | 0644 |
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stacktrace.h | File | 1.29 KB | 0644 |
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string.h | File | 1.15 KB | 0644 |
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switch_to.h | File | 1.17 KB | 0644 |
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syscall.h | File | 1.57 KB | 0644 |
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syscalls.h | File | 653 B | 0644 |
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thread_info.h | File | 3.39 KB | 0644 |
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timex.h | File | 508 B | 0644 |
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tlb-mmu1.h | File | 3.48 KB | 0644 |
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tlb.h | File | 1.23 KB | 0644 |
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tlbflush.h | File | 1.76 KB | 0644 |
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uaccess.h | File | 18.45 KB | 0644 |
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unaligned.h | File | 771 B | 0644 |
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unwind.h | File | 3.51 KB | 0644 |
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