1255 lines
35 KiB
C
1255 lines
35 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_CPUMASK_H
|
|
#define __LINUX_CPUMASK_H
|
|
|
|
/*
|
|
* Cpumasks provide a bitmap suitable for representing the
|
|
* set of CPU's in a system, one bit position per CPU number. In general,
|
|
* only nr_cpu_ids (<= NR_CPUS) bits are valid.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/bitmap.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/gfp_types.h>
|
|
#include <linux/numa.h>
|
|
|
|
/* Don't assign or return these: may not be this big! */
|
|
typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
|
|
|
|
/**
|
|
* cpumask_bits - get the bits in a cpumask
|
|
* @maskp: the struct cpumask *
|
|
*
|
|
* You should only assume nr_cpu_ids bits of this mask are valid. This is
|
|
* a macro so it's const-correct.
|
|
*/
|
|
#define cpumask_bits(maskp) ((maskp)->bits)
|
|
|
|
/**
|
|
* cpumask_pr_args - printf args to output a cpumask
|
|
* @maskp: cpumask to be printed
|
|
*
|
|
* Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
|
|
*/
|
|
#define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp)
|
|
|
|
#if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS)
|
|
#define nr_cpu_ids ((unsigned int)NR_CPUS)
|
|
#else
|
|
extern unsigned int nr_cpu_ids;
|
|
#endif
|
|
|
|
static inline void set_nr_cpu_ids(unsigned int nr)
|
|
{
|
|
#if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS)
|
|
WARN_ON(nr != nr_cpu_ids);
|
|
#else
|
|
nr_cpu_ids = nr;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* We have several different "preferred sizes" for the cpumask
|
|
* operations, depending on operation.
|
|
*
|
|
* For example, the bitmap scanning and operating operations have
|
|
* optimized routines that work for the single-word case, but only when
|
|
* the size is constant. So if NR_CPUS fits in one single word, we are
|
|
* better off using that small constant, in order to trigger the
|
|
* optimized bit finding. That is 'small_cpumask_size'.
|
|
*
|
|
* The clearing and copying operations will similarly perform better
|
|
* with a constant size, but we limit that size arbitrarily to four
|
|
* words. We call this 'large_cpumask_size'.
|
|
*
|
|
* Finally, some operations just want the exact limit, either because
|
|
* they set bits or just don't have any faster fixed-sized versions. We
|
|
* call this just 'nr_cpumask_bits'.
|
|
*
|
|
* Note that these optional constants are always guaranteed to be at
|
|
* least as big as 'nr_cpu_ids' itself is, and all our cpumask
|
|
* allocations are at least that size (see cpumask_size()). The
|
|
* optimization comes from being able to potentially use a compile-time
|
|
* constant instead of a run-time generated exact number of CPUs.
|
|
*/
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
#define small_cpumask_bits ((unsigned int)NR_CPUS)
|
|
#define large_cpumask_bits ((unsigned int)NR_CPUS)
|
|
#elif NR_CPUS <= 4*BITS_PER_LONG
|
|
#define small_cpumask_bits nr_cpu_ids
|
|
#define large_cpumask_bits ((unsigned int)NR_CPUS)
|
|
#else
|
|
#define small_cpumask_bits nr_cpu_ids
|
|
#define large_cpumask_bits nr_cpu_ids
|
|
#endif
|
|
#define nr_cpumask_bits nr_cpu_ids
|
|
|
|
/*
|
|
* The following particular system cpumasks and operations manage
|
|
* possible, present, active and online cpus.
|
|
*
|
|
* cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
|
|
* cpu_present_mask - has bit 'cpu' set iff cpu is populated
|
|
* cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
|
|
* cpu_active_mask - has bit 'cpu' set iff cpu available to migration
|
|
*
|
|
* If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
|
|
*
|
|
* The cpu_possible_mask is fixed at boot time, as the set of CPU id's
|
|
* that it is possible might ever be plugged in at anytime during the
|
|
* life of that system boot. The cpu_present_mask is dynamic(*),
|
|
* representing which CPUs are currently plugged in. And
|
|
* cpu_online_mask is the dynamic subset of cpu_present_mask,
|
|
* indicating those CPUs available for scheduling.
|
|
*
|
|
* If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
|
|
* depending on what ACPI reports as currently plugged in, otherwise
|
|
* cpu_present_mask is just a copy of cpu_possible_mask.
|
|
*
|
|
* (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
|
|
* hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
|
|
*
|
|
* Subtleties:
|
|
* 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
|
|
* assumption that their single CPU is online. The UP
|
|
* cpu_{online,possible,present}_masks are placebos. Changing them
|
|
* will have no useful affect on the following num_*_cpus()
|
|
* and cpu_*() macros in the UP case. This ugliness is a UP
|
|
* optimization - don't waste any instructions or memory references
|
|
* asking if you're online or how many CPUs there are if there is
|
|
* only one CPU.
|
|
*/
|
|
|
|
extern struct cpumask __cpu_possible_mask;
|
|
extern struct cpumask __cpu_online_mask;
|
|
extern struct cpumask __cpu_present_mask;
|
|
extern struct cpumask __cpu_active_mask;
|
|
extern struct cpumask __cpu_dying_mask;
|
|
#define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
|
|
#define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
|
|
#define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
|
|
#define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
|
|
#define cpu_dying_mask ((const struct cpumask *)&__cpu_dying_mask)
|
|
|
|
extern atomic_t __num_online_cpus;
|
|
|
|
extern cpumask_t cpus_booted_once_mask;
|
|
|
|
static __always_inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
|
|
{
|
|
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
|
|
WARN_ON_ONCE(cpu >= bits);
|
|
#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
|
|
}
|
|
|
|
/* verify cpu argument to cpumask_* operators */
|
|
static __always_inline unsigned int cpumask_check(unsigned int cpu)
|
|
{
|
|
cpu_max_bits_warn(cpu, small_cpumask_bits);
|
|
return cpu;
|
|
}
|
|
|
|
/**
|
|
* cpumask_first - get the first cpu in a cpumask
|
|
* @srcp: the cpumask pointer
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
static inline unsigned int cpumask_first(const struct cpumask *srcp)
|
|
{
|
|
return find_first_bit(cpumask_bits(srcp), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_first_zero - get the first unset cpu in a cpumask
|
|
* @srcp: the cpumask pointer
|
|
*
|
|
* Returns >= nr_cpu_ids if all cpus are set.
|
|
*/
|
|
static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
|
|
{
|
|
return find_first_zero_bit(cpumask_bits(srcp), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* 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().
|
|
*/
|
|
static inline
|
|
unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask *srcp2)
|
|
{
|
|
return find_first_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_last - get the last CPU in a cpumask
|
|
* @srcp: - the cpumask pointer
|
|
*
|
|
* Returns >= nr_cpumask_bits if no CPUs set.
|
|
*/
|
|
static inline unsigned int cpumask_last(const struct cpumask *srcp)
|
|
{
|
|
return find_last_bit(cpumask_bits(srcp), small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_next - get the next cpu in a cpumask
|
|
* @n: the cpu prior to the place to search (ie. return will be > @n)
|
|
* @srcp: the cpumask pointer
|
|
*
|
|
* Returns >= nr_cpu_ids if no further cpus set.
|
|
*/
|
|
static inline
|
|
unsigned int cpumask_next(int n, const struct cpumask *srcp)
|
|
{
|
|
/* -1 is a legal arg here. */
|
|
if (n != -1)
|
|
cpumask_check(n);
|
|
return find_next_bit(cpumask_bits(srcp), small_cpumask_bits, n + 1);
|
|
}
|
|
|
|
/**
|
|
* cpumask_next_zero - get the next unset cpu in a cpumask
|
|
* @n: the cpu prior to the place to search (ie. return will be > @n)
|
|
* @srcp: the cpumask pointer
|
|
*
|
|
* Returns >= nr_cpu_ids if no further cpus unset.
|
|
*/
|
|
static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
|
|
{
|
|
/* -1 is a legal arg here. */
|
|
if (n != -1)
|
|
cpumask_check(n);
|
|
return find_next_zero_bit(cpumask_bits(srcp), small_cpumask_bits, n+1);
|
|
}
|
|
|
|
#if NR_CPUS == 1
|
|
/* Uniprocessor: there is only one valid CPU */
|
|
static inline unsigned int cpumask_local_spread(unsigned int i, int node)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return cpumask_first_and(src1p, src2p);
|
|
}
|
|
|
|
static inline unsigned int cpumask_any_distribute(const struct cpumask *srcp)
|
|
{
|
|
return cpumask_first(srcp);
|
|
}
|
|
#else
|
|
unsigned int cpumask_local_spread(unsigned int i, int node);
|
|
unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
|
|
const struct cpumask *src2p);
|
|
unsigned int cpumask_any_distribute(const struct cpumask *srcp);
|
|
#endif /* NR_CPUS */
|
|
|
|
/**
|
|
* cpumask_next_and - get the next cpu in *src1p & *src2p
|
|
* @n: the cpu prior to the place to search (ie. return will be > @n)
|
|
* @src1p: the first cpumask pointer
|
|
* @src2p: the second cpumask pointer
|
|
*
|
|
* Returns >= nr_cpu_ids if no further cpus set in both.
|
|
*/
|
|
static inline
|
|
unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
/* -1 is a legal arg here. */
|
|
if (n != -1)
|
|
cpumask_check(n);
|
|
return find_next_and_bit(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
small_cpumask_bits, n + 1);
|
|
}
|
|
|
|
/**
|
|
* for_each_cpu - iterate over every cpu in a mask
|
|
* @cpu: the (optionally unsigned) integer iterator
|
|
* @mask: the cpumask pointer
|
|
*
|
|
* After the loop, cpu is >= nr_cpu_ids.
|
|
*/
|
|
#define for_each_cpu(cpu, mask) \
|
|
for_each_set_bit(cpu, cpumask_bits(mask), small_cpumask_bits)
|
|
|
|
#if NR_CPUS == 1
|
|
static inline
|
|
unsigned int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap)
|
|
{
|
|
cpumask_check(start);
|
|
if (n != -1)
|
|
cpumask_check(n);
|
|
|
|
/*
|
|
* Return the first available CPU when wrapping, or when starting before cpu0,
|
|
* since there is only one valid option.
|
|
*/
|
|
if (wrap && n >= 0)
|
|
return nr_cpumask_bits;
|
|
|
|
return cpumask_first(mask);
|
|
}
|
|
#else
|
|
unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
|
|
#endif
|
|
|
|
/**
|
|
* for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
|
|
* @cpu: the (optionally unsigned) integer iterator
|
|
* @mask: the cpumask pointer
|
|
* @start: the start location
|
|
*
|
|
* The implementation does not assume any bit in @mask is set (including @start).
|
|
*
|
|
* After the loop, cpu is >= nr_cpu_ids.
|
|
*/
|
|
#define for_each_cpu_wrap(cpu, mask, start) \
|
|
for_each_set_bit_wrap(cpu, cpumask_bits(mask), small_cpumask_bits, start)
|
|
|
|
/**
|
|
* for_each_cpu_and - iterate over every cpu in both masks
|
|
* @cpu: the (optionally unsigned) integer iterator
|
|
* @mask1: the first cpumask pointer
|
|
* @mask2: the second cpumask pointer
|
|
*
|
|
* This saves a temporary CPU mask in many places. It is equivalent to:
|
|
* struct cpumask tmp;
|
|
* cpumask_and(&tmp, &mask1, &mask2);
|
|
* for_each_cpu(cpu, &tmp)
|
|
* ...
|
|
*
|
|
* After the loop, cpu is >= nr_cpu_ids.
|
|
*/
|
|
#define for_each_cpu_and(cpu, mask1, mask2) \
|
|
for_each_and_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
|
|
|
|
/**
|
|
* for_each_cpu_andnot - iterate over every cpu present in one mask, excluding
|
|
* those present in another.
|
|
* @cpu: the (optionally unsigned) integer iterator
|
|
* @mask1: the first cpumask pointer
|
|
* @mask2: the second cpumask pointer
|
|
*
|
|
* This saves a temporary CPU mask in many places. It is equivalent to:
|
|
* struct cpumask tmp;
|
|
* cpumask_andnot(&tmp, &mask1, &mask2);
|
|
* for_each_cpu(cpu, &tmp)
|
|
* ...
|
|
*
|
|
* After the loop, cpu is >= nr_cpu_ids.
|
|
*/
|
|
#define for_each_cpu_andnot(cpu, mask1, mask2) \
|
|
for_each_andnot_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
|
|
|
|
/**
|
|
* for_each_cpu_or - iterate over every cpu present in either mask
|
|
* @cpu: the (optionally unsigned) integer iterator
|
|
* @mask1: the first cpumask pointer
|
|
* @mask2: the second cpumask pointer
|
|
*
|
|
* This saves a temporary CPU mask in many places. It is equivalent to:
|
|
* struct cpumask tmp;
|
|
* cpumask_or(&tmp, &mask1, &mask2);
|
|
* for_each_cpu(cpu, &tmp)
|
|
* ...
|
|
*
|
|
* After the loop, cpu is >= nr_cpu_ids.
|
|
*/
|
|
#define for_each_cpu_or(cpu, mask1, mask2) \
|
|
for_each_or_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
|
|
|
|
/**
|
|
* cpumask_any_but - return a "random" in a cpumask, but not this one.
|
|
* @mask: the cpumask to search
|
|
* @cpu: the cpu to ignore.
|
|
*
|
|
* Often used to find any cpu but smp_processor_id() in a mask.
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
static inline
|
|
unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
|
|
{
|
|
unsigned int i;
|
|
|
|
cpumask_check(cpu);
|
|
for_each_cpu(i, mask)
|
|
if (i != cpu)
|
|
break;
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* cpumask_nth - get the first cpu in a cpumask
|
|
* @srcp: the cpumask pointer
|
|
* @cpu: the N'th cpu to find, starting from 0
|
|
*
|
|
* Returns >= nr_cpu_ids if such cpu doesn't exist.
|
|
*/
|
|
static 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 first cpu in 2 cpumasks
|
|
* @srcp1: the cpumask pointer
|
|
* @srcp2: the cpumask pointer
|
|
* @cpu: the N'th cpu to find, starting from 0
|
|
*
|
|
* Returns >= nr_cpu_ids if such cpu doesn't exist.
|
|
*/
|
|
static 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 first cpu set in 1st cpumask, and clear in 2nd.
|
|
* @srcp1: the cpumask pointer
|
|
* @srcp2: the cpumask pointer
|
|
* @cpu: the N'th cpu to find, starting from 0
|
|
*
|
|
* Returns >= nr_cpu_ids if such cpu doesn't exist.
|
|
*/
|
|
static 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 N'th cpu to find, starting from 0
|
|
*
|
|
* Returns >= 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_test_cpu - test for a cpu in a cpumask
|
|
* @cpu: cpu number (< nr_cpu_ids)
|
|
* @cpumask: the cpumask pointer
|
|
*
|
|
* Returns 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
|
|
*
|
|
* Returns true if @cpu is set in old bitmap of @cpumask, else returns false
|
|
*
|
|
* test_and_set_bit wrapper for cpumasks.
|
|
*/
|
|
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
|
|
*
|
|
* Returns true if @cpu is set in old bitmap of @cpumask, else returns false
|
|
*
|
|
* test_and_clear_bit wrapper for cpumasks.
|
|
*/
|
|
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 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 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
|
|
*
|
|
* If *@dstp is empty, returns false, else returns true
|
|
*/
|
|
static 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 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 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
|
|
*
|
|
* If *@dstp is empty, returns false, else returns true
|
|
*/
|
|
static 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
|
|
*/
|
|
static 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
|
|
*/
|
|
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), small_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),
|
|
small_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_subset - (*src1p & ~*src2p) == 0
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Returns true if *@src1p is a subset of *@src2p, else returns false
|
|
*/
|
|
static 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.
|
|
*/
|
|
static 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.
|
|
*/
|
|
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), 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.
|
|
*/
|
|
static 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_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,
|
|
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 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), large_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_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(large_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);
|
|
|
|
static 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.
|
|
*/
|
|
static inline
|
|
bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);
|
|
}
|
|
|
|
static 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 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])
|
|
|
|
#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)++)
|
|
#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_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
|
|
#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);
|
|
void init_cpu_online(const struct cpumask *src);
|
|
|
|
static inline void reset_cpu_possible_mask(void)
|
|
{
|
|
bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS);
|
|
}
|
|
|
|
static inline void
|
|
set_cpu_possible(unsigned int cpu, bool possible)
|
|
{
|
|
if (possible)
|
|
cpumask_set_cpu(cpu, &__cpu_possible_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_possible_mask);
|
|
}
|
|
|
|
static inline void
|
|
set_cpu_present(unsigned int cpu, bool present)
|
|
{
|
|
if (present)
|
|
cpumask_set_cpu(cpu, &__cpu_present_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_present_mask);
|
|
}
|
|
|
|
void set_cpu_online(unsigned int cpu, bool online);
|
|
|
|
static inline void
|
|
set_cpu_active(unsigned int cpu, bool active)
|
|
{
|
|
if (active)
|
|
cpumask_set_cpu(cpu, &__cpu_active_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_active_mask);
|
|
}
|
|
|
|
static inline void
|
|
set_cpu_dying(unsigned int cpu, bool dying)
|
|
{
|
|
if (dying)
|
|
cpumask_set_cpu(cpu, &__cpu_dying_mask);
|
|
else
|
|
cpumask_clear_cpu(cpu, &__cpu_dying_mask);
|
|
}
|
|
|
|
/**
|
|
* to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
|
|
* @bitmap: the bitmap
|
|
*
|
|
* There are a few places where cpumask_var_t isn't appropriate and
|
|
* static cpumasks must be used (eg. very early boot), yet we don't
|
|
* expose the definition of 'struct cpumask'.
|
|
*
|
|
* This does the conversion, and can be used as a constant initializer.
|
|
*/
|
|
#define to_cpumask(bitmap) \
|
|
((struct cpumask *)(1 ? (bitmap) \
|
|
: (void *)sizeof(__check_is_bitmap(bitmap))))
|
|
|
|
static inline int __check_is_bitmap(const unsigned long *bitmap)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Special-case data structure for "single bit set only" constant CPU masks.
|
|
*
|
|
* We pre-generate all the 64 (or 32) possible bit positions, with enough
|
|
* padding to the left and the right, and return the constant pointer
|
|
* appropriately offset.
|
|
*/
|
|
extern const unsigned long
|
|
cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
|
|
|
|
static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
|
|
{
|
|
const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
|
|
p -= cpu / BITS_PER_LONG;
|
|
return to_cpumask(p);
|
|
}
|
|
|
|
#if NR_CPUS > 1
|
|
/**
|
|
* num_online_cpus() - Read the number of online CPUs
|
|
*
|
|
* Despite the fact that __num_online_cpus is of type atomic_t, this
|
|
* interface gives only a momentary snapshot and is not protected against
|
|
* concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
|
|
* region.
|
|
*/
|
|
static __always_inline unsigned int num_online_cpus(void)
|
|
{
|
|
return arch_atomic_read(&__num_online_cpus);
|
|
}
|
|
#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
|
|
#define num_present_cpus() cpumask_weight(cpu_present_mask)
|
|
#define num_active_cpus() cpumask_weight(cpu_active_mask)
|
|
|
|
static inline bool cpu_online(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_online_mask);
|
|
}
|
|
|
|
static inline bool cpu_possible(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_possible_mask);
|
|
}
|
|
|
|
static inline bool cpu_present(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_present_mask);
|
|
}
|
|
|
|
static inline bool cpu_active(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_active_mask);
|
|
}
|
|
|
|
static inline bool cpu_dying(unsigned int cpu)
|
|
{
|
|
return cpumask_test_cpu(cpu, cpu_dying_mask);
|
|
}
|
|
|
|
#else
|
|
|
|
#define num_online_cpus() 1U
|
|
#define num_possible_cpus() 1U
|
|
#define num_present_cpus() 1U
|
|
#define num_active_cpus() 1U
|
|
|
|
static inline bool cpu_online(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_possible(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_present(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_active(unsigned int cpu)
|
|
{
|
|
return cpu == 0;
|
|
}
|
|
|
|
static inline bool cpu_dying(unsigned int cpu)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* NR_CPUS > 1 */
|
|
|
|
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
|
|
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
#define CPU_BITS_ALL \
|
|
{ \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
}
|
|
|
|
#else /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
#define CPU_BITS_ALL \
|
|
{ \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
}
|
|
#endif /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
/**
|
|
* cpumap_print_to_pagebuf - copies the cpumask into the buffer either
|
|
* as comma-separated list of cpus or hex values of cpumask
|
|
* @list: indicates whether the cpumap must be list
|
|
* @mask: the cpumask to copy
|
|
* @buf: the buffer to copy into
|
|
*
|
|
* Returns the length of the (null-terminated) @buf string, zero if
|
|
* nothing is copied.
|
|
*/
|
|
static inline ssize_t
|
|
cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
|
|
{
|
|
return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
|
|
nr_cpu_ids);
|
|
}
|
|
|
|
/**
|
|
* cpumap_print_bitmask_to_buf - copies the cpumask into the buffer as
|
|
* hex values of cpumask
|
|
*
|
|
* @buf: the buffer to copy into
|
|
* @mask: the cpumask to copy
|
|
* @off: in the string from which we are copying, we copy to @buf
|
|
* @count: the maximum number of bytes to print
|
|
*
|
|
* The function prints the cpumask into the buffer as hex values of
|
|
* cpumask; Typically used by bin_attribute to export cpumask bitmask
|
|
* ABI.
|
|
*
|
|
* Returns the length of how many bytes have been copied, excluding
|
|
* terminating '\0'.
|
|
*/
|
|
static inline ssize_t
|
|
cpumap_print_bitmask_to_buf(char *buf, const struct cpumask *mask,
|
|
loff_t off, size_t count)
|
|
{
|
|
return bitmap_print_bitmask_to_buf(buf, cpumask_bits(mask),
|
|
nr_cpu_ids, off, count) - 1;
|
|
}
|
|
|
|
/**
|
|
* cpumap_print_list_to_buf - copies the cpumask into the buffer as
|
|
* comma-separated list of cpus
|
|
*
|
|
* Everything is same with the above cpumap_print_bitmask_to_buf()
|
|
* except the print format.
|
|
*/
|
|
static inline ssize_t
|
|
cpumap_print_list_to_buf(char *buf, const struct cpumask *mask,
|
|
loff_t off, size_t count)
|
|
{
|
|
return bitmap_print_list_to_buf(buf, cpumask_bits(mask),
|
|
nr_cpu_ids, off, count) - 1;
|
|
}
|
|
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
#define CPU_MASK_ALL \
|
|
(cpumask_t) { { \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
} }
|
|
#else
|
|
#define CPU_MASK_ALL \
|
|
(cpumask_t) { { \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
|
|
} }
|
|
#endif /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
#define CPU_MASK_NONE \
|
|
(cpumask_t) { { \
|
|
[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
|
|
} }
|
|
|
|
#define CPU_MASK_CPU0 \
|
|
(cpumask_t) { { \
|
|
[0] = 1UL \
|
|
} }
|
|
|
|
/*
|
|
* Provide a valid theoretical max size for cpumap and cpulist sysfs files
|
|
* to avoid breaking userspace which may allocate a buffer based on the size
|
|
* reported by e.g. fstat.
|
|
*
|
|
* for cpumap NR_CPUS * 9/32 - 1 should be an exact length.
|
|
*
|
|
* For cpulist 7 is (ceil(log10(NR_CPUS)) + 1) allowing for NR_CPUS to be up
|
|
* to 2 orders of magnitude larger than 8192. And then we divide by 2 to
|
|
* cover a worst-case of every other cpu being on one of two nodes for a
|
|
* very large NR_CPUS.
|
|
*
|
|
* Use PAGE_SIZE as a minimum for smaller configurations while avoiding
|
|
* unsigned comparison to -1.
|
|
*/
|
|
#define CPUMAP_FILE_MAX_BYTES (((NR_CPUS * 9)/32 > PAGE_SIZE) \
|
|
? (NR_CPUS * 9)/32 - 1 : PAGE_SIZE)
|
|
#define CPULIST_FILE_MAX_BYTES (((NR_CPUS * 7)/2 > PAGE_SIZE) ? (NR_CPUS * 7)/2 : PAGE_SIZE)
|
|
|
|
#endif /* __LINUX_CPUMASK_H */
|