forked from mirrors/linux
1cf8e152e8
Since commit 4e1a7df454 ("cpumask: Add enabled cpumask
for present CPUs that can be brought online") introduced
cpu_enabled_mask, the comment line describing the mask
has been slightly out of alignment with the adjacent
lines.
Fix this by removing a single space character.
Signed-off-by: Joel Savitz <jsavitz@redhat.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
1333 lines
38 KiB
C
1333 lines
38 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 CPUs 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/cleanup.h>
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#include <linux/kernel.h>
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#include <linux/bitmap.h>
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#include <linux/cpumask_types.h>
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#include <linux/atomic.h>
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#include <linux/bug.h>
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#include <linux/gfp_types.h>
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#include <linux/numa.h>
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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) || defined(CONFIG_FORCE_NR_CPUS)
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#define nr_cpu_ids ((unsigned int)NR_CPUS)
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#else
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extern unsigned int nr_cpu_ids;
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#endif
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static __always_inline void set_nr_cpu_ids(unsigned int nr)
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{
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#if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS)
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WARN_ON(nr != nr_cpu_ids);
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#else
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nr_cpu_ids = nr;
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#endif
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}
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/*
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* We have several different "preferred sizes" for the cpumask
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* operations, depending on operation.
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*
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* For example, the bitmap scanning and operating operations have
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* optimized routines that work for the single-word case, but only when
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* the size is constant. So if NR_CPUS fits in one single word, we are
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* better off using that small constant, in order to trigger the
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* optimized bit finding. That is 'small_cpumask_size'.
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*
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* The clearing and copying operations will similarly perform better
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* with a constant size, but we limit that size arbitrarily to four
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* words. We call this 'large_cpumask_size'.
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*
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* Finally, some operations just want the exact limit, either because
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* they set bits or just don't have any faster fixed-sized versions. We
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* call this just 'nr_cpumask_bits'.
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*
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* Note that these optional constants are always guaranteed to be at
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* least as big as 'nr_cpu_ids' itself is, and all our cpumask
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* allocations are at least that size (see cpumask_size()). The
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* optimization comes from being able to potentially use a compile-time
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* constant instead of a run-time generated exact number of CPUs.
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*/
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#if NR_CPUS <= BITS_PER_LONG
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#define small_cpumask_bits ((unsigned int)NR_CPUS)
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#define large_cpumask_bits ((unsigned int)NR_CPUS)
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#elif NR_CPUS <= 4*BITS_PER_LONG
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#define small_cpumask_bits nr_cpu_ids
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#define large_cpumask_bits ((unsigned int)NR_CPUS)
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#else
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#define small_cpumask_bits nr_cpu_ids
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#define large_cpumask_bits nr_cpu_ids
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#endif
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#define nr_cpumask_bits nr_cpu_ids
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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_enabled_mask - has bit 'cpu' set iff cpu can be brought online
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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 IDs
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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_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 ARCHes (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_enabled_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_enabled_mask ((const struct cpumask *)&__cpu_enabled_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 __always_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 __always_inline unsigned int cpumask_check(unsigned int cpu)
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{
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cpu_max_bits_warn(cpu, small_cpumask_bits);
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return cpu;
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}
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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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* Return: >= nr_cpu_ids if no cpus set.
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*/
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static __always_inline unsigned int cpumask_first(const struct cpumask *srcp)
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{
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return find_first_bit(cpumask_bits(srcp), small_cpumask_bits);
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}
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/**
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* cpumask_first_zero - get the first unset cpu in a cpumask
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* @srcp: the cpumask pointer
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*
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* Return: >= nr_cpu_ids if all cpus are set.
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*/
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static __always_inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
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{
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return find_first_zero_bit(cpumask_bits(srcp), small_cpumask_bits);
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}
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/**
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* cpumask_first_and - return the first cpu from *srcp1 & *srcp2
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* @srcp1: the first input
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* @srcp2: the second input
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*
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* Return: >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
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*/
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static __always_inline
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unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask *srcp2)
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{
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return find_first_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
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}
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/**
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* cpumask_first_and_and - return the first cpu from *srcp1 & *srcp2 & *srcp3
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* @srcp1: the first input
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* @srcp2: the second input
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* @srcp3: the third input
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*
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* Return: >= nr_cpu_ids if no cpus set in all.
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*/
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static __always_inline
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unsigned int cpumask_first_and_and(const struct cpumask *srcp1,
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const struct cpumask *srcp2,
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const struct cpumask *srcp3)
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{
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return find_first_and_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2),
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cpumask_bits(srcp3), small_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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* Return: >= nr_cpumask_bits if no CPUs set.
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*/
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static __always_inline unsigned int cpumask_last(const struct cpumask *srcp)
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{
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return find_last_bit(cpumask_bits(srcp), small_cpumask_bits);
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}
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/**
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* cpumask_next - get the next cpu in a cpumask
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* @n: the cpu prior to the place to search (i.e. return will be > @n)
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* @srcp: the cpumask pointer
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*
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* Return: >= nr_cpu_ids if no further cpus set.
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*/
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static __always_inline
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unsigned int cpumask_next(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_bit(cpumask_bits(srcp), small_cpumask_bits, n + 1);
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}
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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 (i.e. return will be > @n)
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* @srcp: the cpumask pointer
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*
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* Return: >= nr_cpu_ids if no further cpus unset.
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*/
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static __always_inline
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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), small_cpumask_bits, n+1);
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}
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#if NR_CPUS == 1
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/* Uniprocessor: there is only one valid CPU */
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static __always_inline
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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 __always_inline
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unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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return cpumask_first_and(src1p, src2p);
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}
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static __always_inline
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unsigned 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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#else
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unsigned int cpumask_local_spread(unsigned int i, int node);
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unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
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const struct cpumask *src2p);
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unsigned int cpumask_any_distribute(const struct cpumask *srcp);
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#endif /* NR_CPUS */
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/**
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* cpumask_next_and - get the next cpu in *src1p & *src2p
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* @n: the cpu prior to the place to search (i.e. return will be > @n)
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* @src1p: the first cpumask pointer
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* @src2p: the second cpumask pointer
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*
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* Return: >= nr_cpu_ids if no further cpus set in both.
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*/
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static __always_inline
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unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
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const struct cpumask *src2p)
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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_and_bit(cpumask_bits(src1p), cpumask_bits(src2p),
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small_cpumask_bits, n + 1);
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}
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/**
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* cpumask_next_and_wrap - get the next cpu in *src1p & *src2p, starting from
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* @n+1. If nothing found, wrap around and start from
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* the beginning
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* @n: the cpu prior to the place to search (i.e. search starts from @n+1)
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* @src1p: the first cpumask pointer
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* @src2p: the second cpumask pointer
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*
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* Return: next set bit, wrapped if needed, or >= nr_cpu_ids if @src1p & @src2p is empty.
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*/
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static __always_inline
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unsigned int cpumask_next_and_wrap(int n, const struct cpumask *src1p,
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const struct cpumask *src2p)
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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_and_bit_wrap(cpumask_bits(src1p), cpumask_bits(src2p),
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small_cpumask_bits, n + 1);
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}
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/**
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* cpumask_next_wrap - get the next cpu in *src, starting from @n+1. If nothing
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* found, wrap around and start from the beginning
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* @n: the cpu prior to the place to search (i.e. search starts from @n+1)
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* @src: cpumask pointer
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*
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* Return: next set bit, wrapped if needed, or >= nr_cpu_ids if @src is empty.
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*/
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static __always_inline
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unsigned int cpumask_next_wrap(int n, const struct cpumask *src)
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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_bit_wrap(cpumask_bits(src), small_cpumask_bits, n + 1);
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}
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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_each_set_bit(cpu, cpumask_bits(mask), small_cpumask_bits)
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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_each_set_bit_wrap(cpu, cpumask_bits(mask), small_cpumask_bits, start)
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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_each_and_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
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/**
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* for_each_cpu_andnot - iterate over every cpu present in one mask, excluding
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* those present in another.
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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_andnot(&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_andnot(cpu, mask1, mask2) \
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for_each_andnot_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
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/**
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* for_each_cpu_or - iterate over every cpu present in either mask
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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_or(&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_or(cpu, mask1, mask2) \
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for_each_or_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
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/**
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* for_each_cpu_from - iterate over CPUs present in @mask, from @cpu to the end of @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_from(cpu, mask) \
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for_each_set_bit_from(cpu, cpumask_bits(mask), small_cpumask_bits)
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/**
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* cpumask_any_but - return an arbitrary cpu in a cpumask, but not this one.
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* @mask: the cpumask to search
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* @cpu: the cpu to ignore.
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*
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* Often used to find any cpu but smp_processor_id() in a mask.
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* Return: >= nr_cpu_ids if no cpus set.
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*/
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static __always_inline
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unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
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{
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unsigned int i;
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cpumask_check(cpu);
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for_each_cpu(i, mask)
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if (i != cpu)
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break;
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return i;
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}
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/**
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* cpumask_any_and_but - pick an arbitrary cpu from *mask1 & *mask2, but not this one.
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* @mask1: the first input cpumask
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* @mask2: the second input cpumask
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* @cpu: the cpu to ignore
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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 __always_inline
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unsigned int cpumask_any_and_but(const struct cpumask *mask1,
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const struct cpumask *mask2,
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unsigned int cpu)
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{
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unsigned int i;
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cpumask_check(cpu);
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i = cpumask_first_and(mask1, mask2);
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if (i != cpu)
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return i;
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return cpumask_next_and(cpu, mask1, mask2);
|
|
}
|
|
|
|
/**
|
|
* cpumask_nth - get the Nth cpu in a cpumask
|
|
* @srcp: the cpumask pointer
|
|
* @cpu: the Nth cpu to find, starting from 0
|
|
*
|
|
* Return: >= nr_cpu_ids if such cpu doesn't exist.
|
|
*/
|
|
static __always_inline
|
|
unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp)
|
|
{
|
|
return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu));
|
|
}
|
|
|
|
/**
|
|
* cpumask_nth_and - get the Nth cpu in 2 cpumasks
|
|
* @srcp1: the cpumask pointer
|
|
* @srcp2: the cpumask pointer
|
|
* @cpu: the Nth cpu to find, starting from 0
|
|
*
|
|
* Return: >= nr_cpu_ids if such cpu doesn't exist.
|
|
*/
|
|
static __always_inline
|
|
unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1,
|
|
const struct cpumask *srcp2)
|
|
{
|
|
return find_nth_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2),
|
|
small_cpumask_bits, cpumask_check(cpu));
|
|
}
|
|
|
|
/**
|
|
* cpumask_nth_andnot - get the Nth cpu set in 1st cpumask, and clear in 2nd.
|
|
* @srcp1: the cpumask pointer
|
|
* @srcp2: the cpumask pointer
|
|
* @cpu: the Nth cpu to find, starting from 0
|
|
*
|
|
* Return: >= nr_cpu_ids if such cpu doesn't exist.
|
|
*/
|
|
static __always_inline
|
|
unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
|
|
const struct cpumask *srcp2)
|
|
{
|
|
return find_nth_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2),
|
|
small_cpumask_bits, cpumask_check(cpu));
|
|
}
|
|
|
|
/**
|
|
* cpumask_nth_and_andnot - get the Nth cpu set in 1st and 2nd cpumask, and clear in 3rd.
|
|
* @srcp1: the cpumask pointer
|
|
* @srcp2: the cpumask pointer
|
|
* @srcp3: the cpumask pointer
|
|
* @cpu: the Nth cpu to find, starting from 0
|
|
*
|
|
* Return: >= nr_cpu_ids if such cpu doesn't exist.
|
|
*/
|
|
static __always_inline
|
|
unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp1,
|
|
const struct cpumask *srcp2,
|
|
const struct cpumask *srcp3)
|
|
{
|
|
return find_nth_and_andnot_bit(cpumask_bits(srcp1),
|
|
cpumask_bits(srcp2),
|
|
cpumask_bits(srcp3),
|
|
small_cpumask_bits, cpumask_check(cpu));
|
|
}
|
|
|
|
#define CPU_BITS_NONE \
|
|
{ \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
|
|
}
|
|
|
|
#define CPU_BITS_CPU0 \
|
|
{ \
|
|
[0] = 1UL \
|
|
}
|
|
|
|
/**
|
|
* cpumask_set_cpu - set a cpu in a cpumask
|
|
* @cpu: cpu number (< nr_cpu_ids)
|
|
* @dstp: the cpumask pointer
|
|
*/
|
|
static __always_inline
|
|
void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
|
|
{
|
|
set_bit(cpumask_check(cpu), cpumask_bits(dstp));
|
|
}
|
|
|
|
static __always_inline
|
|
void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
|
|
{
|
|
__set_bit(cpumask_check(cpu), cpumask_bits(dstp));
|
|
}
|
|
|
|
|
|
/**
|
|
* cpumask_clear_cpu - clear a cpu in a cpumask
|
|
* @cpu: cpu number (< nr_cpu_ids)
|
|
* @dstp: the cpumask pointer
|
|
*/
|
|
static __always_inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
|
|
{
|
|
clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
|
|
}
|
|
|
|
static __always_inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
|
|
{
|
|
__clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
|
|
}
|
|
|
|
/**
|
|
* cpumask_assign_cpu - assign a cpu in a cpumask
|
|
* @cpu: cpu number (< nr_cpu_ids)
|
|
* @dstp: the cpumask pointer
|
|
* @bool: the value to assign
|
|
*/
|
|
static __always_inline void cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value)
|
|
{
|
|
assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value);
|
|
}
|
|
|
|
static __always_inline void __cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value)
|
|
{
|
|
__assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value);
|
|
}
|
|
|
|
/**
|
|
* cpumask_test_cpu - test for a cpu in a cpumask
|
|
* @cpu: cpu number (< nr_cpu_ids)
|
|
* @cpumask: the cpumask pointer
|
|
*
|
|
* Return: true if @cpu is set in @cpumask, else returns false
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
|
|
{
|
|
return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
|
|
}
|
|
|
|
/**
|
|
* cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
|
|
* @cpu: cpu number (< nr_cpu_ids)
|
|
* @cpumask: the cpumask pointer
|
|
*
|
|
* test_and_set_bit wrapper for cpumasks.
|
|
*
|
|
* Return: true if @cpu is set in old bitmap of @cpumask, else returns false
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
|
|
{
|
|
return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
|
|
}
|
|
|
|
/**
|
|
* cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
|
|
* @cpu: cpu number (< nr_cpu_ids)
|
|
* @cpumask: the cpumask pointer
|
|
*
|
|
* test_and_clear_bit wrapper for cpumasks.
|
|
*
|
|
* Return: true if @cpu is set in old bitmap of @cpumask, else returns false
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
|
|
{
|
|
return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
|
|
}
|
|
|
|
/**
|
|
* cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
|
|
* @dstp: the cpumask pointer
|
|
*/
|
|
static __always_inline void cpumask_setall(struct cpumask *dstp)
|
|
{
|
|
if (small_const_nbits(small_cpumask_bits)) {
|
|
cpumask_bits(dstp)[0] = BITMAP_LAST_WORD_MASK(nr_cpumask_bits);
|
|
return;
|
|
}
|
|
bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
|
|
* @dstp: the cpumask pointer
|
|
*/
|
|
static __always_inline void cpumask_clear(struct cpumask *dstp)
|
|
{
|
|
bitmap_zero(cpumask_bits(dstp), large_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_and - *dstp = *src1p & *src2p
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Return: false if *@dstp is empty, else returns true
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_and(struct cpumask *dstp, const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
|
|
cpumask_bits(src2p), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_or - *dstp = *src1p | *src2p
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static __always_inline
|
|
void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
|
|
cpumask_bits(src2p), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_xor - *dstp = *src1p ^ *src2p
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static __always_inline
|
|
void cpumask_xor(struct cpumask *dstp, const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
|
|
cpumask_bits(src2p), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_andnot - *dstp = *src1p & ~*src2p
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Return: false if *@dstp is empty, else returns true
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_andnot(struct cpumask *dstp, const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
|
|
cpumask_bits(src2p), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_equal - *src1p == *src2p
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Return: true if the cpumasks are equal, false if not
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_equal(const struct cpumask *src1p, const struct cpumask *src2p)
|
|
{
|
|
return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_or_equal - *src1p | *src2p == *src3p
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
* @src3p: the third input
|
|
*
|
|
* Return: true if first cpumask ORed with second cpumask == third cpumask,
|
|
* otherwise false
|
|
*/
|
|
static __always_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), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_intersects - (*src1p & *src2p) != 0
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Return: true if first cpumask ANDed with second cpumask is non-empty,
|
|
* otherwise false
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_intersects(const struct cpumask *src1p, const struct cpumask *src2p)
|
|
{
|
|
return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_subset - (*src1p & ~*src2p) == 0
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Return: true if *@src1p is a subset of *@src2p, else returns false
|
|
*/
|
|
static __always_inline
|
|
bool cpumask_subset(const struct cpumask *src1p, const struct cpumask *src2p)
|
|
{
|
|
return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_empty - *srcp == 0
|
|
* @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
|
|
*
|
|
* Return: true if srcp is empty (has no bits set), else false
|
|
*/
|
|
static __always_inline bool cpumask_empty(const struct cpumask *srcp)
|
|
{
|
|
return bitmap_empty(cpumask_bits(srcp), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_full - *srcp == 0xFFFFFFFF...
|
|
* @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
|
|
*
|
|
* Return: true if srcp is full (has all bits set), else false
|
|
*/
|
|
static __always_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.
|
|
*
|
|
* Return: count of bits set in *srcp
|
|
*/
|
|
static __always_inline unsigned int cpumask_weight(const struct cpumask *srcp)
|
|
{
|
|
return bitmap_weight(cpumask_bits(srcp), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_weight_and - Count of bits in (*srcp1 & *srcp2)
|
|
* @srcp1: the cpumask to count bits (< nr_cpu_ids) in.
|
|
* @srcp2: the cpumask to count bits (< nr_cpu_ids) in.
|
|
*
|
|
* Return: count of bits set in both *srcp1 and *srcp2
|
|
*/
|
|
static __always_inline
|
|
unsigned int cpumask_weight_and(const struct cpumask *srcp1, const struct cpumask *srcp2)
|
|
{
|
|
return bitmap_weight_and(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_weight_andnot - Count of bits in (*srcp1 & ~*srcp2)
|
|
* @srcp1: the cpumask to count bits (< nr_cpu_ids) in.
|
|
* @srcp2: the cpumask to count bits (< nr_cpu_ids) in.
|
|
*
|
|
* Return: count of bits set in both *srcp1 and *srcp2
|
|
*/
|
|
static __always_inline
|
|
unsigned int cpumask_weight_andnot(const struct cpumask *srcp1,
|
|
const struct cpumask *srcp2)
|
|
{
|
|
return bitmap_weight_andnot(cpumask_bits(srcp1), cpumask_bits(srcp2), small_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 __always_inline
|
|
void cpumask_shift_right(struct cpumask *dstp, const struct cpumask *srcp, int n)
|
|
{
|
|
bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
|
small_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 __always_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 __always_inline
|
|
void cpumask_copy(struct cpumask *dstp, const struct cpumask *srcp)
|
|
{
|
|
bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), large_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_any - pick an arbitrary cpu from *srcp
|
|
* @srcp: the input cpumask
|
|
*
|
|
* Return: >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
#define cpumask_any(srcp) cpumask_first(srcp)
|
|
|
|
/**
|
|
* cpumask_any_and - pick an arbitrary cpu from *mask1 & *mask2
|
|
* @mask1: the first input cpumask
|
|
* @mask2: the second input cpumask
|
|
*
|
|
* Return: >= 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.
|
|
*
|
|
* Return: -errno, or 0 for success.
|
|
*/
|
|
static __always_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.
|
|
*
|
|
* Return: -errno, or 0 for success.
|
|
*/
|
|
static __always_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.
|
|
*
|
|
* Return: -errno, or 0 for success.
|
|
*/
|
|
static __always_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.
|
|
*
|
|
* Return: -errno, or 0 for success.
|
|
*/
|
|
static __always_inline int cpulist_parse(const char *buf, struct cpumask *dstp)
|
|
{
|
|
return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_size - calculate size to allocate for a 'struct cpumask' in bytes
|
|
*
|
|
* Return: size to allocate for a &struct cpumask in bytes
|
|
*/
|
|
static __always_inline unsigned int cpumask_size(void)
|
|
{
|
|
return bitmap_size(large_cpumask_bits);
|
|
}
|
|
|
|
#ifdef CONFIG_CPUMASK_OFFSTACK
|
|
|
|
#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);
|
|
|
|
static __always_inline
|
|
bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
|
|
{
|
|
return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node);
|
|
}
|
|
|
|
/**
|
|
* alloc_cpumask_var - allocate a struct cpumask
|
|
* @mask: pointer to cpumask_var_t where the cpumask is returned
|
|
* @flags: GFP_ flags
|
|
*
|
|
* Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
|
|
* a nop returning a constant 1 (in <linux/cpumask.h>).
|
|
*
|
|
* See alloc_cpumask_var_node.
|
|
*
|
|
* Return: %true if allocation succeeded, %false if not
|
|
*/
|
|
static __always_inline
|
|
bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);
|
|
}
|
|
|
|
static __always_inline
|
|
bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
return alloc_cpumask_var(mask, flags | __GFP_ZERO);
|
|
}
|
|
|
|
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 __always_inline bool cpumask_available(cpumask_var_t mask)
|
|
{
|
|
return mask != NULL;
|
|
}
|
|
|
|
#else
|
|
|
|
#define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
|
|
#define __cpumask_var_read_mostly
|
|
|
|
static __always_inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static __always_inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
|
|
int node)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static __always_inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
cpumask_clear(*mask);
|
|
return true;
|
|
}
|
|
|
|
static __always_inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
|
|
int node)
|
|
{
|
|
cpumask_clear(*mask);
|
|
return true;
|
|
}
|
|
|
|
static __always_inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
|
|
{
|
|
}
|
|
|
|
static __always_inline void free_cpumask_var(cpumask_var_t mask)
|
|
{
|
|
}
|
|
|
|
static __always_inline void free_bootmem_cpumask_var(cpumask_var_t mask)
|
|
{
|
|
}
|
|
|
|
static __always_inline bool cpumask_available(cpumask_var_t mask)
|
|
{
|
|
return true;
|
|
}
|
|
#endif /* CONFIG_CPUMASK_OFFSTACK */
|
|
|
|
DEFINE_FREE(free_cpumask_var, struct cpumask *, if (_T) free_cpumask_var(_T));
|
|
|
|
/* 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])
|
|
|
|
#if NR_CPUS == 1
|
|
/* Uniprocessor: the possible/online/present masks are always "1" */
|
|
#define for_each_possible_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++)
|
|
#define for_each_online_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++)
|
|
#define for_each_present_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++)
|
|
|
|
#define for_each_possible_cpu_wrap(cpu, start) \
|
|
for ((void)(start), (cpu) = 0; (cpu) < 1; (cpu)++)
|
|
#define for_each_online_cpu_wrap(cpu, start) \
|
|
for ((void)(start), (cpu) = 0; (cpu) < 1; (cpu)++)
|
|
#else
|
|
#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_enabled_cpu(cpu) for_each_cpu((cpu), cpu_enabled_mask)
|
|
#define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
|
|
|
|
#define for_each_possible_cpu_wrap(cpu, start) \
|
|
for_each_cpu_wrap((cpu), cpu_possible_mask, (start))
|
|
#define for_each_online_cpu_wrap(cpu, start) \
|
|
for_each_cpu_wrap((cpu), cpu_online_mask, (start))
|
|
#endif
|
|
|
|
/* 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);
|
|
|
|
#define assign_cpu(cpu, mask, val) \
|
|
assign_bit(cpumask_check(cpu), cpumask_bits(mask), (val))
|
|
|
|
#define set_cpu_possible(cpu, possible) assign_cpu((cpu), &__cpu_possible_mask, (possible))
|
|
#define set_cpu_enabled(cpu, enabled) assign_cpu((cpu), &__cpu_enabled_mask, (enabled))
|
|
#define set_cpu_present(cpu, present) assign_cpu((cpu), &__cpu_present_mask, (present))
|
|
#define set_cpu_active(cpu, active) assign_cpu((cpu), &__cpu_active_mask, (active))
|
|
#define set_cpu_dying(cpu, dying) assign_cpu((cpu), &__cpu_dying_mask, (dying))
|
|
|
|
void set_cpu_online(unsigned int cpu, bool online);
|
|
|
|
/**
|
|
* to_cpumask - convert a 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 __always_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 __always_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.
|
|
*
|
|
* Return: momentary snapshot of the number of online CPUs
|
|
*/
|
|
static __always_inline unsigned int num_online_cpus(void)
|
|
{
|
|
return raw_atomic_read(&__num_online_cpus);
|
|
}
|
|
#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
|
|
#define num_enabled_cpus() cpumask_weight(cpu_enabled_mask)
|
|
#define num_present_cpus() cpumask_weight(cpu_present_mask)
|
|
#define num_active_cpus() cpumask_weight(cpu_active_mask)
|
|
|
|
static __always_inline bool cpu_online(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_online_mask);
|
|
}
|
|
|
|
static __always_inline bool cpu_enabled(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_enabled_mask);
|
|
}
|
|
|
|
static __always_inline bool cpu_possible(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_possible_mask);
|
|
}
|
|
|
|
static __always_inline bool cpu_present(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_present_mask);
|
|
}
|
|
|
|
static __always_inline bool cpu_active(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_active_mask);
|
|
}
|
|
|
|
static __always_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_enabled_cpus() 1U
|
|
#define num_present_cpus() 1U
|
|
#define num_active_cpus() 1U
|
|
|
|
static __always_inline bool cpu_online(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static __always_inline bool cpu_possible(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static __always_inline bool cpu_enabled(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static __always_inline bool cpu_present(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static __always_inline bool cpu_active(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static __always_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
|
|
*
|
|
* Return: the length of the (null-terminated) @buf string, zero if
|
|
* nothing is copied.
|
|
*/
|
|
static __always_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.
|
|
*
|
|
* Return: the length of how many bytes have been copied, excluding
|
|
* terminating '\0'.
|
|
*/
|
|
static __always_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
|
|
* @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
|
|
*
|
|
* Everything is same with the above cpumap_print_bitmask_to_buf()
|
|
* except the print format.
|
|
*
|
|
* Return: the length of how many bytes have been copied, excluding
|
|
* terminating '\0'.
|
|
*/
|
|
static __always_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 */
|