1068 строки
29 KiB
C
1068 строки
29 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_CPUMASK_H
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#define __LINUX_CPUMASK_H
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/*
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* Cpumasks provide a bitmap suitable for representing the
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* set of CPU's in a system, one bit position per CPU number. In general,
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* only nr_cpu_ids (<= NR_CPUS) bits are valid.
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*/
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#include <linux/kernel.h>
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#include <linux/threads.h>
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#include <linux/bitmap.h>
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#include <linux/atomic.h>
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#include <linux/bug.h>
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/* Don't assign or return these: may not be this big! */
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typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
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/**
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* cpumask_bits - get the bits in a cpumask
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* @maskp: the struct cpumask *
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*
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* You should only assume nr_cpu_ids bits of this mask are valid. This is
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* a macro so it's const-correct.
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*/
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#define cpumask_bits(maskp) ((maskp)->bits)
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/**
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* cpumask_pr_args - printf args to output a cpumask
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* @maskp: cpumask to be printed
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*
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* Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
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*/
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#define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp)
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#if NR_CPUS == 1
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#define nr_cpu_ids 1U
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#else
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extern unsigned int nr_cpu_ids;
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#endif
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#ifdef CONFIG_CPUMASK_OFFSTACK
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/* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
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* not all bits may be allocated. */
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#define nr_cpumask_bits nr_cpu_ids
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#else
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#define nr_cpumask_bits ((unsigned int)NR_CPUS)
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#endif
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/*
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* The following particular system cpumasks and operations manage
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* possible, present, active and online cpus.
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*
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* cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
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* cpu_present_mask - has bit 'cpu' set iff cpu is populated
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* cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
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* cpu_active_mask - has bit 'cpu' set iff cpu available to migration
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*
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* If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
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*
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* The cpu_possible_mask is fixed at boot time, as the set of CPU id's
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* that it is possible might ever be plugged in at anytime during the
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* life of that system boot. The cpu_present_mask is dynamic(*),
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* representing which CPUs are currently plugged in. And
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* cpu_online_mask is the dynamic subset of cpu_present_mask,
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* indicating those CPUs available for scheduling.
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*
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* If HOTPLUG is enabled, then cpu_possible_mask is forced to have
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* all NR_CPUS bits set, otherwise it is just the set of CPUs that
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* ACPI reports present at boot.
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*
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* If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
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* depending on what ACPI reports as currently plugged in, otherwise
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* cpu_present_mask is just a copy of cpu_possible_mask.
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*
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* (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
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* hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
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*
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* Subtleties:
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* 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
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* assumption that their single CPU is online. The UP
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* cpu_{online,possible,present}_masks are placebos. Changing them
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* will have no useful affect on the following num_*_cpus()
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* and cpu_*() macros in the UP case. This ugliness is a UP
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* optimization - don't waste any instructions or memory references
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* asking if you're online or how many CPUs there are if there is
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* only one CPU.
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*/
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extern struct cpumask __cpu_possible_mask;
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extern struct cpumask __cpu_online_mask;
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extern struct cpumask __cpu_present_mask;
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extern struct cpumask __cpu_active_mask;
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extern struct cpumask __cpu_dying_mask;
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#define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
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#define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
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#define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
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#define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
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#define cpu_dying_mask ((const struct cpumask *)&__cpu_dying_mask)
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extern atomic_t __num_online_cpus;
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extern cpumask_t cpus_booted_once_mask;
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static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
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{
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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WARN_ON_ONCE(cpu >= bits);
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#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
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}
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/* verify cpu argument to cpumask_* operators */
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static inline unsigned int cpumask_check(unsigned int cpu)
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{
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cpu_max_bits_warn(cpu, nr_cpumask_bits);
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return cpu;
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}
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#if NR_CPUS == 1
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/* Uniprocessor. Assume all masks are "1". */
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static inline unsigned int cpumask_first(const struct cpumask *srcp)
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{
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return 0;
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}
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static inline unsigned int cpumask_last(const struct cpumask *srcp)
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{
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return 0;
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}
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/* Valid inputs for n are -1 and 0. */
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static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
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{
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return n+1;
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}
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static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
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{
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return n+1;
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}
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static inline unsigned int cpumask_next_and(int n,
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const struct cpumask *srcp,
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const struct cpumask *andp)
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{
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return n+1;
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}
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static inline unsigned int cpumask_next_wrap(int n, const struct cpumask *mask,
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int start, bool wrap)
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{
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/* cpu0 unless stop condition, wrap and at cpu0, then nr_cpumask_bits */
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return (wrap && n == 0);
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}
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/* cpu must be a valid cpu, ie 0, so there's no other choice. */
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static inline unsigned int cpumask_any_but(const struct cpumask *mask,
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unsigned int cpu)
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{
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return 1;
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}
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static inline unsigned int cpumask_local_spread(unsigned int i, int node)
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{
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return 0;
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}
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static inline int cpumask_any_and_distribute(const struct cpumask *src1p,
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const struct cpumask *src2p) {
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return cpumask_next_and(-1, src1p, src2p);
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}
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static inline int cpumask_any_distribute(const struct cpumask *srcp)
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{
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return cpumask_first(srcp);
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}
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#define for_each_cpu(cpu, mask) \
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for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
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#define for_each_cpu_not(cpu, mask) \
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for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
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#define for_each_cpu_wrap(cpu, mask, start) \
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for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
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#define for_each_cpu_and(cpu, mask1, mask2) \
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for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask1, (void)mask2)
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#else
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/**
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* cpumask_first - get the first cpu in a cpumask
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* @srcp: the cpumask pointer
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*
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* Returns >= nr_cpu_ids if no cpus set.
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*/
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static inline unsigned int cpumask_first(const struct cpumask *srcp)
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{
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return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
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}
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/**
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* cpumask_last - get the last CPU in a cpumask
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* @srcp: - the cpumask pointer
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*
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* Returns >= nr_cpumask_bits if no CPUs set.
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*/
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static inline unsigned int cpumask_last(const struct cpumask *srcp)
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{
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return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits);
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}
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unsigned int __pure cpumask_next(int n, const struct cpumask *srcp);
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/**
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* cpumask_next_zero - get the next unset cpu in a cpumask
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* @n: the cpu prior to the place to search (ie. return will be > @n)
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* @srcp: the cpumask pointer
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*
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* Returns >= nr_cpu_ids if no further cpus unset.
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*/
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static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
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{
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/* -1 is a legal arg here. */
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if (n != -1)
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cpumask_check(n);
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return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
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}
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int __pure cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
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int __pure cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
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unsigned int cpumask_local_spread(unsigned int i, int node);
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int cpumask_any_and_distribute(const struct cpumask *src1p,
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const struct cpumask *src2p);
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int cpumask_any_distribute(const struct cpumask *srcp);
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/**
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* for_each_cpu - iterate over every cpu in a mask
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* @cpu: the (optionally unsigned) integer iterator
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* @mask: the cpumask pointer
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*
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* After the loop, cpu is >= nr_cpu_ids.
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*/
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#define for_each_cpu(cpu, mask) \
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for ((cpu) = -1; \
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(cpu) = cpumask_next((cpu), (mask)), \
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(cpu) < nr_cpu_ids;)
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/**
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* for_each_cpu_not - iterate over every cpu in a complemented mask
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* @cpu: the (optionally unsigned) integer iterator
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* @mask: the cpumask pointer
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*
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* After the loop, cpu is >= nr_cpu_ids.
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*/
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#define for_each_cpu_not(cpu, mask) \
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for ((cpu) = -1; \
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(cpu) = cpumask_next_zero((cpu), (mask)), \
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(cpu) < nr_cpu_ids;)
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extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
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/**
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* for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
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* @cpu: the (optionally unsigned) integer iterator
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* @mask: the cpumask pointer
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* @start: the start location
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*
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* The implementation does not assume any bit in @mask is set (including @start).
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*
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* After the loop, cpu is >= nr_cpu_ids.
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*/
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#define for_each_cpu_wrap(cpu, mask, start) \
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for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
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(cpu) < nr_cpumask_bits; \
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(cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
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/**
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* for_each_cpu_and - iterate over every cpu in both masks
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* @cpu: the (optionally unsigned) integer iterator
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* @mask1: the first cpumask pointer
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* @mask2: the second cpumask pointer
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*
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* This saves a temporary CPU mask in many places. It is equivalent to:
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* struct cpumask tmp;
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* cpumask_and(&tmp, &mask1, &mask2);
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* for_each_cpu(cpu, &tmp)
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* ...
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*
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* After the loop, cpu is >= nr_cpu_ids.
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*/
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#define for_each_cpu_and(cpu, mask1, mask2) \
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for ((cpu) = -1; \
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(cpu) = cpumask_next_and((cpu), (mask1), (mask2)), \
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(cpu) < nr_cpu_ids;)
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#endif /* SMP */
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#define CPU_BITS_NONE \
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{ \
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[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
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}
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#define CPU_BITS_CPU0 \
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{ \
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[0] = 1UL \
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}
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/**
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* cpumask_set_cpu - set a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
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{
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set_bit(cpumask_check(cpu), cpumask_bits(dstp));
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}
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static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
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{
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__set_bit(cpumask_check(cpu), cpumask_bits(dstp));
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}
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/**
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* cpumask_clear_cpu - clear a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
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{
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clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
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}
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static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
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{
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__clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
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}
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/**
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* cpumask_test_cpu - test for a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @cpumask: the cpumask pointer
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*
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* Returns 1 if @cpu is set in @cpumask, else returns 0
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*/
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static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
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{
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return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
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}
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/**
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* cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @cpumask: the cpumask pointer
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*
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* Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
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*
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* test_and_set_bit wrapper for cpumasks.
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*/
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static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
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{
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return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
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}
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/**
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* cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
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* @cpu: cpu number (< nr_cpu_ids)
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* @cpumask: the cpumask pointer
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*
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* Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
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*
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* test_and_clear_bit wrapper for cpumasks.
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*/
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static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
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{
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return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
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}
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/**
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* cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_setall(struct cpumask *dstp)
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{
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bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
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}
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/**
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* cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
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* @dstp: the cpumask pointer
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*/
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static inline void cpumask_clear(struct cpumask *dstp)
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{
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bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
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}
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/**
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* cpumask_and - *dstp = *src1p & *src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*
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* If *@dstp is empty, returns 0, else returns 1
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*/
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static inline int cpumask_and(struct cpumask *dstp,
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const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_or - *dstp = *src1p | *src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_xor - *dstp = *src1p ^ *src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline void cpumask_xor(struct cpumask *dstp,
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const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_andnot - *dstp = *src1p & ~*src2p
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* @dstp: the cpumask result
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* @src1p: the first input
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* @src2p: the second input
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*
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* If *@dstp is empty, returns 0, else returns 1
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*/
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static inline int cpumask_andnot(struct cpumask *dstp,
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const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
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cpumask_bits(src2p), nr_cpumask_bits);
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}
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/**
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* cpumask_complement - *dstp = ~*srcp
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* @dstp: the cpumask result
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* @srcp: the input to invert
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*/
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static inline void cpumask_complement(struct cpumask *dstp,
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const struct cpumask *srcp)
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{
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bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
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nr_cpumask_bits);
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}
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/**
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* cpumask_equal - *src1p == *src2p
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* @src1p: the first input
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* @src2p: the second input
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*/
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static inline bool cpumask_equal(const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
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nr_cpumask_bits);
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}
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|
|
/**
|
|
* cpumask_or_equal - *src1p | *src2p == *src3p
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
* @src3p: the third input
|
|
*/
|
|
static inline bool cpumask_or_equal(const struct cpumask *src1p,
|
|
const struct cpumask *src2p,
|
|
const struct cpumask *src3p)
|
|
{
|
|
return bitmap_or_equal(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
cpumask_bits(src3p), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_intersects - (*src1p & *src2p) != 0
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static inline bool cpumask_intersects(const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_subset - (*src1p & ~*src2p) == 0
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Returns 1 if *@src1p is a subset of *@src2p, else returns 0
|
|
*/
|
|
static inline int cpumask_subset(const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_empty - *srcp == 0
|
|
* @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
|
|
*/
|
|
static inline bool cpumask_empty(const struct cpumask *srcp)
|
|
{
|
|
return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_full - *srcp == 0xFFFFFFFF...
|
|
* @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
|
|
*/
|
|
static inline bool cpumask_full(const struct cpumask *srcp)
|
|
{
|
|
return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_weight - Count of bits in *srcp
|
|
* @srcp: the cpumask to count bits (< nr_cpu_ids) in.
|
|
*/
|
|
static inline unsigned int cpumask_weight(const struct cpumask *srcp)
|
|
{
|
|
return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_shift_right - *dstp = *srcp >> n
|
|
* @dstp: the cpumask result
|
|
* @srcp: the input to shift
|
|
* @n: the number of bits to shift by
|
|
*/
|
|
static inline void cpumask_shift_right(struct cpumask *dstp,
|
|
const struct cpumask *srcp, int n)
|
|
{
|
|
bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_shift_left - *dstp = *srcp << n
|
|
* @dstp: the cpumask result
|
|
* @srcp: the input to shift
|
|
* @n: the number of bits to shift by
|
|
*/
|
|
static inline void cpumask_shift_left(struct cpumask *dstp,
|
|
const struct cpumask *srcp, int n)
|
|
{
|
|
bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_copy - *dstp = *srcp
|
|
* @dstp: the result
|
|
* @srcp: the input cpumask
|
|
*/
|
|
static inline void cpumask_copy(struct cpumask *dstp,
|
|
const struct cpumask *srcp)
|
|
{
|
|
bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_any - pick a "random" cpu from *srcp
|
|
* @srcp: the input cpumask
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
#define cpumask_any(srcp) cpumask_first(srcp)
|
|
|
|
/**
|
|
* cpumask_first_and - return the first cpu from *srcp1 & *srcp2
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
|
|
*/
|
|
#define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
|
|
|
|
/**
|
|
* cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
|
|
* @mask1: the first input cpumask
|
|
* @mask2: the second input cpumask
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
#define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
|
|
|
|
/**
|
|
* cpumask_of - the cpumask containing just a given cpu
|
|
* @cpu: the cpu (<= nr_cpu_ids)
|
|
*/
|
|
#define cpumask_of(cpu) (get_cpu_mask(cpu))
|
|
|
|
/**
|
|
* cpumask_parse_user - extract a cpumask from a user string
|
|
* @buf: the buffer to extract from
|
|
* @len: the length of the buffer
|
|
* @dstp: the cpumask to set.
|
|
*
|
|
* Returns -errno, or 0 for success.
|
|
*/
|
|
static inline int cpumask_parse_user(const char __user *buf, int len,
|
|
struct cpumask *dstp)
|
|
{
|
|
return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_parselist_user - extract a cpumask from a user string
|
|
* @buf: the buffer to extract from
|
|
* @len: the length of the buffer
|
|
* @dstp: the cpumask to set.
|
|
*
|
|
* Returns -errno, or 0 for success.
|
|
*/
|
|
static inline int cpumask_parselist_user(const char __user *buf, int len,
|
|
struct cpumask *dstp)
|
|
{
|
|
return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_parse - extract a cpumask from a string
|
|
* @buf: the buffer to extract from
|
|
* @dstp: the cpumask to set.
|
|
*
|
|
* Returns -errno, or 0 for success.
|
|
*/
|
|
static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
|
|
{
|
|
return bitmap_parse(buf, UINT_MAX, cpumask_bits(dstp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpulist_parse - extract a cpumask from a user string of ranges
|
|
* @buf: the buffer to extract from
|
|
* @dstp: the cpumask to set.
|
|
*
|
|
* Returns -errno, or 0 for success.
|
|
*/
|
|
static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
|
|
{
|
|
return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_size - size to allocate for a 'struct cpumask' in bytes
|
|
*/
|
|
static inline unsigned int cpumask_size(void)
|
|
{
|
|
return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);
|
|
}
|
|
|
|
/*
|
|
* cpumask_var_t: struct cpumask for stack usage.
|
|
*
|
|
* Oh, the wicked games we play! In order to make kernel coding a
|
|
* little more difficult, we typedef cpumask_var_t to an array or a
|
|
* pointer: doing &mask on an array is a noop, so it still works.
|
|
*
|
|
* ie.
|
|
* cpumask_var_t tmpmask;
|
|
* if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
|
|
* return -ENOMEM;
|
|
*
|
|
* ... use 'tmpmask' like a normal struct cpumask * ...
|
|
*
|
|
* free_cpumask_var(tmpmask);
|
|
*
|
|
*
|
|
* However, one notable exception is there. alloc_cpumask_var() allocates
|
|
* only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
|
|
* NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
|
|
*
|
|
* cpumask_var_t tmpmask;
|
|
* if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
|
|
* return -ENOMEM;
|
|
*
|
|
* var = *tmpmask;
|
|
*
|
|
* This code makes NR_CPUS length memcopy and brings to a memory corruption.
|
|
* cpumask_copy() provide safe copy functionality.
|
|
*
|
|
* Note that there is another evil here: If you define a cpumask_var_t
|
|
* as a percpu variable then the way to obtain the address of the cpumask
|
|
* structure differently influences what this_cpu_* operation needs to be
|
|
* used. Please use this_cpu_cpumask_var_t in those cases. The direct use
|
|
* of this_cpu_ptr() or this_cpu_read() will lead to failures when the
|
|
* other type of cpumask_var_t implementation is configured.
|
|
*
|
|
* Please also note that __cpumask_var_read_mostly can be used to declare
|
|
* a cpumask_var_t variable itself (not its content) as read mostly.
|
|
*/
|
|
#ifdef CONFIG_CPUMASK_OFFSTACK
|
|
typedef struct cpumask *cpumask_var_t;
|
|
|
|
#define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
|
|
#define __cpumask_var_read_mostly __read_mostly
|
|
|
|
bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
|
|
bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
|
|
bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
|
|
bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
|
|
void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
|
|
void free_cpumask_var(cpumask_var_t mask);
|
|
void free_bootmem_cpumask_var(cpumask_var_t mask);
|
|
|
|
static inline bool cpumask_available(cpumask_var_t mask)
|
|
{
|
|
return mask != NULL;
|
|
}
|
|
|
|
#else
|
|
typedef struct cpumask cpumask_var_t[1];
|
|
|
|
#define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
|
|
#define __cpumask_var_read_mostly
|
|
|
|
static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
|
|
int node)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
cpumask_clear(*mask);
|
|
return true;
|
|
}
|
|
|
|
static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
|
|
int node)
|
|
{
|
|
cpumask_clear(*mask);
|
|
return true;
|
|
}
|
|
|
|
static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
|
|
{
|
|
}
|
|
|
|
static inline void free_cpumask_var(cpumask_var_t mask)
|
|
{
|
|
}
|
|
|
|
static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
|
|
{
|
|
}
|
|
|
|
static inline bool cpumask_available(cpumask_var_t mask)
|
|
{
|
|
return true;
|
|
}
|
|
#endif /* CONFIG_CPUMASK_OFFSTACK */
|
|
|
|
/* It's common to want to use cpu_all_mask in struct member initializers,
|
|
* so it has to refer to an address rather than a pointer. */
|
|
extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
|
|
#define cpu_all_mask to_cpumask(cpu_all_bits)
|
|
|
|
/* First bits of cpu_bit_bitmap are in fact unset. */
|
|
#define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
|
|
|
|
#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
|
|
#define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
|
|
#define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
|
|
|
|
/* Wrappers for arch boot code to manipulate normally-constant masks */
|
|
void init_cpu_present(const struct cpumask *src);
|
|
void init_cpu_possible(const struct cpumask *src);
|
|
void init_cpu_online(const struct cpumask *src);
|
|
|
|
static inline void reset_cpu_possible_mask(void)
|
|
{
|
|
bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS);
|
|
}
|
|
|
|
static inline void
|
|
set_cpu_possible(unsigned int cpu, bool possible)
|
|
{
|
|
if (possible)
|
|
cpumask_set_cpu(cpu, &__cpu_possible_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_possible_mask);
|
|
}
|
|
|
|
static inline void
|
|
set_cpu_present(unsigned int cpu, bool present)
|
|
{
|
|
if (present)
|
|
cpumask_set_cpu(cpu, &__cpu_present_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_present_mask);
|
|
}
|
|
|
|
void set_cpu_online(unsigned int cpu, bool online);
|
|
|
|
static inline void
|
|
set_cpu_active(unsigned int cpu, bool active)
|
|
{
|
|
if (active)
|
|
cpumask_set_cpu(cpu, &__cpu_active_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_active_mask);
|
|
}
|
|
|
|
static inline void
|
|
set_cpu_dying(unsigned int cpu, bool dying)
|
|
{
|
|
if (dying)
|
|
cpumask_set_cpu(cpu, &__cpu_dying_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_dying_mask);
|
|
}
|
|
|
|
/**
|
|
* to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
|
|
* @bitmap: the bitmap
|
|
*
|
|
* There are a few places where cpumask_var_t isn't appropriate and
|
|
* static cpumasks must be used (eg. very early boot), yet we don't
|
|
* expose the definition of 'struct cpumask'.
|
|
*
|
|
* This does the conversion, and can be used as a constant initializer.
|
|
*/
|
|
#define to_cpumask(bitmap) \
|
|
((struct cpumask *)(1 ? (bitmap) \
|
|
: (void *)sizeof(__check_is_bitmap(bitmap))))
|
|
|
|
static inline int __check_is_bitmap(const unsigned long *bitmap)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Special-case data structure for "single bit set only" constant CPU masks.
|
|
*
|
|
* We pre-generate all the 64 (or 32) possible bit positions, with enough
|
|
* padding to the left and the right, and return the constant pointer
|
|
* appropriately offset.
|
|
*/
|
|
extern const unsigned long
|
|
cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
|
|
|
|
static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
|
|
{
|
|
const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
|
|
p -= cpu / BITS_PER_LONG;
|
|
return to_cpumask(p);
|
|
}
|
|
|
|
#if NR_CPUS > 1
|
|
/**
|
|
* num_online_cpus() - Read the number of online CPUs
|
|
*
|
|
* Despite the fact that __num_online_cpus is of type atomic_t, this
|
|
* interface gives only a momentary snapshot and is not protected against
|
|
* concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
|
|
* region.
|
|
*/
|
|
static inline unsigned int num_online_cpus(void)
|
|
{
|
|
return atomic_read(&__num_online_cpus);
|
|
}
|
|
#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
|
|
#define num_present_cpus() cpumask_weight(cpu_present_mask)
|
|
#define num_active_cpus() cpumask_weight(cpu_active_mask)
|
|
|
|
static inline bool cpu_online(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_online_mask);
|
|
}
|
|
|
|
static inline bool cpu_possible(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_possible_mask);
|
|
}
|
|
|
|
static inline bool cpu_present(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_present_mask);
|
|
}
|
|
|
|
static inline bool cpu_active(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_active_mask);
|
|
}
|
|
|
|
static inline bool cpu_dying(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_dying_mask);
|
|
}
|
|
|
|
#else
|
|
|
|
#define num_online_cpus() 1U
|
|
#define num_possible_cpus() 1U
|
|
#define num_present_cpus() 1U
|
|
#define num_active_cpus() 1U
|
|
|
|
static inline bool cpu_online(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_possible(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_present(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_active(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_dying(unsigned int cpu)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* NR_CPUS > 1 */
|
|
|
|
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
|
|
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
#define CPU_BITS_ALL \
|
|
{ \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
}
|
|
|
|
#else /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
#define CPU_BITS_ALL \
|
|
{ \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
}
|
|
#endif /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
/**
|
|
* cpumap_print_to_pagebuf - copies the cpumask into the buffer either
|
|
* as comma-separated list of cpus or hex values of cpumask
|
|
* @list: indicates whether the cpumap must be list
|
|
* @mask: the cpumask to copy
|
|
* @buf: the buffer to copy into
|
|
*
|
|
* Returns the length of the (null-terminated) @buf string, zero if
|
|
* nothing is copied.
|
|
*/
|
|
static inline ssize_t
|
|
cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
|
|
{
|
|
return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
|
|
nr_cpu_ids);
|
|
}
|
|
|
|
/**
|
|
* cpumap_print_bitmask_to_buf - copies the cpumask into the buffer as
|
|
* hex values of cpumask
|
|
*
|
|
* @buf: the buffer to copy into
|
|
* @mask: the cpumask to copy
|
|
* @off: in the string from which we are copying, we copy to @buf
|
|
* @count: the maximum number of bytes to print
|
|
*
|
|
* The function prints the cpumask into the buffer as hex values of
|
|
* cpumask; Typically used by bin_attribute to export cpumask bitmask
|
|
* ABI.
|
|
*
|
|
* Returns the length of how many bytes have been copied, excluding
|
|
* terminating '\0'.
|
|
*/
|
|
static inline ssize_t
|
|
cpumap_print_bitmask_to_buf(char *buf, const struct cpumask *mask,
|
|
loff_t off, size_t count)
|
|
{
|
|
return bitmap_print_bitmask_to_buf(buf, cpumask_bits(mask),
|
|
nr_cpu_ids, off, count) - 1;
|
|
}
|
|
|
|
/**
|
|
* cpumap_print_list_to_buf - copies the cpumask into the buffer as
|
|
* comma-separated list of cpus
|
|
*
|
|
* Everything is same with the above cpumap_print_bitmask_to_buf()
|
|
* except the print format.
|
|
*/
|
|
static inline ssize_t
|
|
cpumap_print_list_to_buf(char *buf, const struct cpumask *mask,
|
|
loff_t off, size_t count)
|
|
{
|
|
return bitmap_print_list_to_buf(buf, cpumask_bits(mask),
|
|
nr_cpu_ids, off, count) - 1;
|
|
}
|
|
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
#define CPU_MASK_ALL \
|
|
(cpumask_t) { { \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
} }
|
|
#else
|
|
#define CPU_MASK_ALL \
|
|
(cpumask_t) { { \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
} }
|
|
#endif /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
#define CPU_MASK_NONE \
|
|
(cpumask_t) { { \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
|
|
} }
|
|
|
|
#define CPU_MASK_CPU0 \
|
|
(cpumask_t) { { \
|
|
[0] = 1UL \
|
|
} }
|
|
|
|
/*
|
|
* Provide a valid theoretical max size for cpumap and cpulist sysfs files
|
|
* to avoid breaking userspace which may allocate a buffer based on the size
|
|
* reported by e.g. fstat.
|
|
*
|
|
* for cpumap NR_CPUS * 9/32 - 1 should be an exact length.
|
|
*
|
|
* For cpulist 7 is (ceil(log10(NR_CPUS)) + 1) allowing for NR_CPUS to be up
|
|
* to 2 orders of magnitude larger than 8192. And then we divide by 2 to
|
|
* cover a worst-case of every other cpu being on one of two nodes for a
|
|
* very large NR_CPUS.
|
|
*
|
|
* Use PAGE_SIZE as a minimum for smaller configurations while avoiding
|
|
* unsigned comparison to -1.
|
|
*/
|
|
#define CPUMAP_FILE_MAX_BYTES (((NR_CPUS * 9)/32 > PAGE_SIZE) \
|
|
? (NR_CPUS * 9)/32 - 1 : PAGE_SIZE)
|
|
#define CPULIST_FILE_MAX_BYTES (((NR_CPUS * 7)/2 > PAGE_SIZE) ? (NR_CPUS * 7)/2 : PAGE_SIZE)
|
|
|
|
#endif /* __LINUX_CPUMASK_H */
|