46a87b3851
Currently, when updating the affinity of tasks via either cpusets.cpus,
or, sched_setaffinity(); tasks not currently running within the newly
specified mask will be arbitrarily assigned to the first CPU within the
mask.
This (particularly in the case that we are restricting masks) can
result in many tasks being assigned to the first CPUs of their new
masks.
This:
1) Can induce scheduling delays while the load-balancer has a chance to
spread them between their new CPUs.
2) Can antogonize a poor load-balancer behavior where it has a
difficult time recognizing that a cross-socket imbalance has been
forced by an affinity mask.
This change adds a new cpumask interface to allow iterated calls to
distribute within the intersection of the provided masks.
The cases that this mainly affects are:
- modifying cpuset.cpus
- when tasks join a cpuset
- when modifying a task's affinity via sched_setaffinity(2)
Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Josh Don <joshdon@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Qais Yousef <qais.yousef@arm.com>
Tested-by: Qais Yousef <qais.yousef@arm.com>
Link: https://lkml.kernel.org/r/20200311010113.136465-1-joshdon@google.com
949 lines
27 KiB
C
949 lines
27 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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#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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extern atomic_t __num_online_cpus;
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#if NR_CPUS > 1
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/**
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* num_online_cpus() - Read the number of online CPUs
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*
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* Despite the fact that __num_online_cpus is of type atomic_t, this
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* interface gives only a momentary snapshot and is not protected against
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* concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
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* region.
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*/
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static inline unsigned int num_online_cpus(void)
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{
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return atomic_read(&__num_online_cpus);
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}
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#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
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#define num_present_cpus() cpumask_weight(cpu_present_mask)
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#define num_active_cpus() cpumask_weight(cpu_active_mask)
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#define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
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#define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
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#define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
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#define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
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#else
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#define num_online_cpus() 1U
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#define num_possible_cpus() 1U
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#define num_present_cpus() 1U
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#define num_active_cpus() 1U
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#define cpu_online(cpu) ((cpu) == 0)
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#define cpu_possible(cpu) ((cpu) == 0)
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#define cpu_present(cpu) ((cpu) == 0)
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#define cpu_active(cpu) ((cpu) == 0)
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#endif
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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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#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 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 cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
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int 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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/**
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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 poiter
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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
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static 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), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_andnot - *dstp = *src1p & ~*src2p
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* If *@dstp is empty, returns 0, else returns 1
|
|
*/
|
|
static inline int 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), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_complement - *dstp = ~*srcp
|
|
* @dstp: the cpumask result
|
|
* @srcp: the input to invert
|
|
*/
|
|
static inline void cpumask_complement(struct cpumask *dstp,
|
|
const struct cpumask *srcp)
|
|
{
|
|
bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_equal - *src1p == *src2p
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static inline bool cpumask_equal(const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
#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);
|
|
}
|
|
|
|
#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
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#define CPU_MASK_ALL \
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(cpumask_t) { { \
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[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
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[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
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} }
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#endif /* NR_CPUS > BITS_PER_LONG */
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#define CPU_MASK_NONE \
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(cpumask_t) { { \
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[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
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} }
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|
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#define CPU_MASK_CPU0 \
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(cpumask_t) { { \
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[0] = 1UL \
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} }
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#endif /* __LINUX_CPUMASK_H */
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