1086 lines
33 KiB
C
1086 lines
33 KiB
C
#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.
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*
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* The new cpumask_ ops take a "struct cpumask *"; the old ones
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* use cpumask_t.
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*
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* See detailed comments in the file linux/bitmap.h describing the
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* data type on which these cpumasks are based.
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*
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* For details of cpumask_scnprintf() and cpumask_parse_user(),
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* see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c.
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* For details of cpulist_scnprintf() and cpulist_parse(), see
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* bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.
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* For details of cpu_remap(), see bitmap_bitremap in lib/bitmap.c
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* For details of cpus_remap(), see bitmap_remap in lib/bitmap.c.
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* For details of cpus_onto(), see bitmap_onto in lib/bitmap.c.
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* For details of cpus_fold(), see bitmap_fold in lib/bitmap.c.
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*
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* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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* Note: The alternate operations with the suffix "_nr" are used
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* to limit the range of the loop to nr_cpu_ids instead of
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* NR_CPUS when NR_CPUS > 64 for performance reasons.
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* If NR_CPUS is <= 64 then most assembler bitmask
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* operators execute faster with a constant range, so
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* the operator will continue to use NR_CPUS.
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*
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* Another consideration is that nr_cpu_ids is initialized
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* to NR_CPUS and isn't lowered until the possible cpus are
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* discovered (including any disabled cpus). So early uses
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* will span the entire range of NR_CPUS.
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* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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*
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* The obsolescent cpumask operations are:
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*
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* void cpu_set(cpu, mask) turn on bit 'cpu' in mask
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* void cpu_clear(cpu, mask) turn off bit 'cpu' in mask
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* void cpus_setall(mask) set all bits
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* void cpus_clear(mask) clear all bits
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* int cpu_isset(cpu, mask) true iff bit 'cpu' set in mask
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* int cpu_test_and_set(cpu, mask) test and set bit 'cpu' in mask
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*
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* void cpus_and(dst, src1, src2) dst = src1 & src2 [intersection]
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* void cpus_or(dst, src1, src2) dst = src1 | src2 [union]
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* void cpus_xor(dst, src1, src2) dst = src1 ^ src2
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* void cpus_andnot(dst, src1, src2) dst = src1 & ~src2
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* void cpus_complement(dst, src) dst = ~src
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*
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* int cpus_equal(mask1, mask2) Does mask1 == mask2?
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* int cpus_intersects(mask1, mask2) Do mask1 and mask2 intersect?
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* int cpus_subset(mask1, mask2) Is mask1 a subset of mask2?
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* int cpus_empty(mask) Is mask empty (no bits sets)?
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* int cpus_full(mask) Is mask full (all bits sets)?
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* int cpus_weight(mask) Hamming weigh - number of set bits
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* int cpus_weight_nr(mask) Same using nr_cpu_ids instead of NR_CPUS
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*
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* void cpus_shift_right(dst, src, n) Shift right
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* void cpus_shift_left(dst, src, n) Shift left
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*
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* int first_cpu(mask) Number lowest set bit, or NR_CPUS
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* int next_cpu(cpu, mask) Next cpu past 'cpu', or NR_CPUS
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* int next_cpu_nr(cpu, mask) Next cpu past 'cpu', or nr_cpu_ids
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*
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* cpumask_t cpumask_of_cpu(cpu) Return cpumask with bit 'cpu' set
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* (can be used as an lvalue)
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* CPU_MASK_ALL Initializer - all bits set
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* CPU_MASK_NONE Initializer - no bits set
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* unsigned long *cpus_addr(mask) Array of unsigned long's in mask
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*
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* CPUMASK_ALLOC kmalloc's a structure that is a composite of many cpumask_t
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* variables, and CPUMASK_PTR provides pointers to each field.
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*
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* The structure should be defined something like this:
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* struct my_cpumasks {
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* cpumask_t mask1;
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* cpumask_t mask2;
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* };
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*
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* Usage is then:
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* CPUMASK_ALLOC(my_cpumasks);
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* CPUMASK_PTR(mask1, my_cpumasks);
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* CPUMASK_PTR(mask2, my_cpumasks);
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*
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* --- DO NOT reference cpumask_t pointers until this check ---
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* if (my_cpumasks == NULL)
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* "kmalloc failed"...
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*
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* References are now pointers to the cpumask_t variables (*mask1, ...)
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*
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*if NR_CPUS > BITS_PER_LONG
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* CPUMASK_ALLOC(m) Declares and allocates struct m *m =
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* kmalloc(sizeof(*m), GFP_KERNEL)
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* CPUMASK_FREE(m) Macro for kfree(m)
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*else
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* CPUMASK_ALLOC(m) Declares struct m _m, *m = &_m
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* CPUMASK_FREE(m) Nop
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*endif
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* CPUMASK_PTR(v, m) Declares cpumask_t *v = &(m->v)
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* ------------------------------------------------------------------------
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*
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* int cpumask_scnprintf(buf, len, mask) Format cpumask for printing
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* int cpumask_parse_user(ubuf, ulen, mask) Parse ascii string as cpumask
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* int cpulist_scnprintf(buf, len, mask) Format cpumask as list for printing
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* int cpulist_parse(buf, map) Parse ascii string as cpulist
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* int cpu_remap(oldbit, old, new) newbit = map(old, new)(oldbit)
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* void cpus_remap(dst, src, old, new) *dst = map(old, new)(src)
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* void cpus_onto(dst, orig, relmap) *dst = orig relative to relmap
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* void cpus_fold(dst, orig, sz) dst bits = orig bits mod sz
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*
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* for_each_cpu_mask(cpu, mask) for-loop cpu over mask using NR_CPUS
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* for_each_cpu_mask_nr(cpu, mask) for-loop cpu over mask using nr_cpu_ids
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*
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* int num_online_cpus() Number of online CPUs
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* int num_possible_cpus() Number of all possible CPUs
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* int num_present_cpus() Number of present CPUs
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*
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* int cpu_online(cpu) Is some cpu online?
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* int cpu_possible(cpu) Is some cpu possible?
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* int cpu_present(cpu) Is some cpu present (can schedule)?
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*
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* int any_online_cpu(mask) First online cpu in mask
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*
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* for_each_possible_cpu(cpu) for-loop cpu over cpu_possible_map
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* for_each_online_cpu(cpu) for-loop cpu over cpu_online_map
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* for_each_present_cpu(cpu) for-loop cpu over cpu_present_map
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*
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* Subtlety:
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* 1) The 'type-checked' form of cpu_isset() causes gcc (3.3.2, anyway)
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* to generate slightly worse code. Note for example the additional
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* 40 lines of assembly code compiling the "for each possible cpu"
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* loops buried in the disk_stat_read() macros calls when compiling
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* drivers/block/genhd.c (arch i386, CONFIG_SMP=y). So use a simple
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* one-line #define for cpu_isset(), instead of wrapping an inline
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* inside a macro, the way we do the other calls.
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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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typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
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extern cpumask_t _unused_cpumask_arg_;
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#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
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static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
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{
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set_bit(cpu, dstp->bits);
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}
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#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
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static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
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{
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clear_bit(cpu, dstp->bits);
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}
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#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
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static inline void __cpus_setall(cpumask_t *dstp, int nbits)
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{
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bitmap_fill(dstp->bits, nbits);
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}
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#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
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static inline void __cpus_clear(cpumask_t *dstp, int nbits)
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{
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bitmap_zero(dstp->bits, nbits);
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}
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/* No static inline type checking - see Subtlety (1) above. */
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#define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
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#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
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static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
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{
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return test_and_set_bit(cpu, addr->bits);
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}
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#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
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static inline void __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
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const cpumask_t *src2p, int nbits)
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{
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bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
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}
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#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
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static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
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const cpumask_t *src2p, int nbits)
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{
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bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
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}
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#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
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static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
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const cpumask_t *src2p, int nbits)
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{
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bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
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}
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#define cpus_andnot(dst, src1, src2) \
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__cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
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static inline void __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
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const cpumask_t *src2p, int nbits)
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{
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bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
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}
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#define cpus_complement(dst, src) __cpus_complement(&(dst), &(src), NR_CPUS)
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static inline void __cpus_complement(cpumask_t *dstp,
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const cpumask_t *srcp, int nbits)
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{
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bitmap_complement(dstp->bits, srcp->bits, nbits);
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}
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#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
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static inline int __cpus_equal(const cpumask_t *src1p,
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const cpumask_t *src2p, int nbits)
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{
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return bitmap_equal(src1p->bits, src2p->bits, nbits);
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}
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#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
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static inline int __cpus_intersects(const cpumask_t *src1p,
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const cpumask_t *src2p, int nbits)
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{
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return bitmap_intersects(src1p->bits, src2p->bits, nbits);
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}
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#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
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static inline int __cpus_subset(const cpumask_t *src1p,
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const cpumask_t *src2p, int nbits)
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{
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return bitmap_subset(src1p->bits, src2p->bits, nbits);
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}
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#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
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static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
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{
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return bitmap_empty(srcp->bits, nbits);
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}
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#define cpus_full(cpumask) __cpus_full(&(cpumask), NR_CPUS)
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static inline int __cpus_full(const cpumask_t *srcp, int nbits)
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{
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return bitmap_full(srcp->bits, nbits);
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}
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#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
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static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
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{
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return bitmap_weight(srcp->bits, nbits);
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}
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#define cpus_shift_right(dst, src, n) \
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__cpus_shift_right(&(dst), &(src), (n), NR_CPUS)
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static inline void __cpus_shift_right(cpumask_t *dstp,
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const cpumask_t *srcp, int n, int nbits)
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{
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bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
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}
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#define cpus_shift_left(dst, src, n) \
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__cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
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static inline void __cpus_shift_left(cpumask_t *dstp,
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const cpumask_t *srcp, int n, int nbits)
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{
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bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
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}
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/*
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* Special-case data structure for "single bit set only" constant CPU masks.
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*
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* We pre-generate all the 64 (or 32) possible bit positions, with enough
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* padding to the left and the right, and return the constant pointer
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* appropriately offset.
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*/
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extern const unsigned long
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cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
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static inline const cpumask_t *get_cpu_mask(unsigned int cpu)
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{
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const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
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p -= cpu / BITS_PER_LONG;
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return (const cpumask_t *)p;
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}
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/*
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* In cases where we take the address of the cpumask immediately,
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* gcc optimizes it out (it's a constant) and there's no huge stack
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* variable created:
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*/
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#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
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#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
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#if NR_CPUS <= BITS_PER_LONG
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#define CPU_MASK_ALL \
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(cpumask_t) { { \
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[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
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} }
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#define CPU_MASK_ALL_PTR (&CPU_MASK_ALL)
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#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] = CPU_MASK_LAST_WORD \
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} }
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/* cpu_mask_all is in init/main.c */
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extern cpumask_t cpu_mask_all;
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#define CPU_MASK_ALL_PTR (&cpu_mask_all)
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#endif
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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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#define CPU_MASK_CPU0 \
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(cpumask_t) { { \
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[0] = 1UL \
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} }
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#define cpus_addr(src) ((src).bits)
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#if NR_CPUS > BITS_PER_LONG
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#define CPUMASK_ALLOC(m) struct m *m = kmalloc(sizeof(*m), GFP_KERNEL)
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#define CPUMASK_FREE(m) kfree(m)
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#else
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#define CPUMASK_ALLOC(m) struct m _m, *m = &_m
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#define CPUMASK_FREE(m)
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#endif
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#define CPUMASK_PTR(v, m) cpumask_t *v = &(m->v)
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#define cpumask_scnprintf(buf, len, src) \
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__cpumask_scnprintf((buf), (len), &(src), NR_CPUS)
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static inline int __cpumask_scnprintf(char *buf, int len,
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const cpumask_t *srcp, int nbits)
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{
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return bitmap_scnprintf(buf, len, srcp->bits, nbits);
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}
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#define cpumask_parse_user(ubuf, ulen, dst) \
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__cpumask_parse_user((ubuf), (ulen), &(dst), NR_CPUS)
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static inline int __cpumask_parse_user(const char __user *buf, int len,
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cpumask_t *dstp, int nbits)
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{
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return bitmap_parse_user(buf, len, dstp->bits, nbits);
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}
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#define cpulist_scnprintf(buf, len, src) \
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__cpulist_scnprintf((buf), (len), &(src), NR_CPUS)
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static inline int __cpulist_scnprintf(char *buf, int len,
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const cpumask_t *srcp, int nbits)
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{
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return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);
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}
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#define cpulist_parse(buf, dst) __cpulist_parse((buf), &(dst), NR_CPUS)
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static inline int __cpulist_parse(const char *buf, cpumask_t *dstp, int nbits)
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{
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return bitmap_parselist(buf, dstp->bits, nbits);
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}
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#define cpu_remap(oldbit, old, new) \
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__cpu_remap((oldbit), &(old), &(new), NR_CPUS)
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static inline int __cpu_remap(int oldbit,
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const cpumask_t *oldp, const cpumask_t *newp, int nbits)
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{
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return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);
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}
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#define cpus_remap(dst, src, old, new) \
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__cpus_remap(&(dst), &(src), &(old), &(new), NR_CPUS)
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static inline void __cpus_remap(cpumask_t *dstp, const cpumask_t *srcp,
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const cpumask_t *oldp, const cpumask_t *newp, int nbits)
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{
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bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
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}
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#define cpus_onto(dst, orig, relmap) \
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__cpus_onto(&(dst), &(orig), &(relmap), NR_CPUS)
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static inline void __cpus_onto(cpumask_t *dstp, const cpumask_t *origp,
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const cpumask_t *relmapp, int nbits)
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{
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bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits);
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}
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#define cpus_fold(dst, orig, sz) \
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__cpus_fold(&(dst), &(orig), sz, NR_CPUS)
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static inline void __cpus_fold(cpumask_t *dstp, const cpumask_t *origp,
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int sz, int nbits)
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{
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bitmap_fold(dstp->bits, origp->bits, sz, nbits);
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}
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#if NR_CPUS == 1
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#define nr_cpu_ids 1
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#define first_cpu(src) ({ (void)(src); 0; })
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#define next_cpu(n, src) ({ (void)(src); 1; })
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#define any_online_cpu(mask) 0
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#define for_each_cpu_mask(cpu, mask) \
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|
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
|
|
|
|
#else /* NR_CPUS > 1 */
|
|
|
|
extern int nr_cpu_ids;
|
|
int __first_cpu(const cpumask_t *srcp);
|
|
int __next_cpu(int n, const cpumask_t *srcp);
|
|
int __any_online_cpu(const cpumask_t *mask);
|
|
|
|
#define first_cpu(src) __first_cpu(&(src))
|
|
#define next_cpu(n, src) __next_cpu((n), &(src))
|
|
#define any_online_cpu(mask) __any_online_cpu(&(mask))
|
|
#define for_each_cpu_mask(cpu, mask) \
|
|
for ((cpu) = -1; \
|
|
(cpu) = next_cpu((cpu), (mask)), \
|
|
(cpu) < NR_CPUS; )
|
|
#endif
|
|
|
|
#if NR_CPUS <= 64
|
|
|
|
#define next_cpu_nr(n, src) next_cpu(n, src)
|
|
#define cpus_weight_nr(cpumask) cpus_weight(cpumask)
|
|
#define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
|
|
|
|
#else /* NR_CPUS > 64 */
|
|
|
|
int __next_cpu_nr(int n, const cpumask_t *srcp);
|
|
#define next_cpu_nr(n, src) __next_cpu_nr((n), &(src))
|
|
#define cpus_weight_nr(cpumask) __cpus_weight(&(cpumask), nr_cpu_ids)
|
|
#define for_each_cpu_mask_nr(cpu, mask) \
|
|
for ((cpu) = -1; \
|
|
(cpu) = next_cpu_nr((cpu), (mask)), \
|
|
(cpu) < nr_cpu_ids; )
|
|
|
|
#endif /* NR_CPUS > 64 */
|
|
|
|
/*
|
|
* The following particular system cpumasks and operations manage
|
|
* possible, present, active and online cpus. Each of them is a fixed size
|
|
* bitmap of size NR_CPUS.
|
|
*
|
|
* #ifdef CONFIG_HOTPLUG_CPU
|
|
* cpu_possible_map - has bit 'cpu' set iff cpu is populatable
|
|
* cpu_present_map - has bit 'cpu' set iff cpu is populated
|
|
* cpu_online_map - has bit 'cpu' set iff cpu available to scheduler
|
|
* cpu_active_map - has bit 'cpu' set iff cpu available to migration
|
|
* #else
|
|
* cpu_possible_map - has bit 'cpu' set iff cpu is populated
|
|
* cpu_present_map - copy of cpu_possible_map
|
|
* cpu_online_map - has bit 'cpu' set iff cpu available to scheduler
|
|
* #endif
|
|
*
|
|
* In either case, NR_CPUS is fixed at compile time, as the static
|
|
* size of these bitmaps. The cpu_possible_map 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_map is dynamic(*), representing which CPUs
|
|
* are currently plugged in. And cpu_online_map is the dynamic
|
|
* subset of cpu_present_map, indicating those CPUs available
|
|
* for scheduling.
|
|
*
|
|
* If HOTPLUG is enabled, then cpu_possible_map is forced to have
|
|
* all NR_CPUS bits set, otherwise it is just the set of CPUs that
|
|
* ACPI reports present at boot.
|
|
*
|
|
* If HOTPLUG is enabled, then cpu_present_map varies dynamically,
|
|
* depending on what ACPI reports as currently plugged in, otherwise
|
|
* cpu_present_map is just a copy of cpu_possible_map.
|
|
*
|
|
* (*) Well, cpu_present_map is dynamic in the hotplug case. If not
|
|
* hotplug, it's a copy of cpu_possible_map, 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}_maps 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.
|
|
* 2) Most SMP arch's #define some of these maps to be some
|
|
* other map specific to that arch. Therefore, the following
|
|
* must be #define macros, not inlines. To see why, examine
|
|
* the assembly code produced by the following. Note that
|
|
* set1() writes phys_x_map, but set2() writes x_map:
|
|
* int x_map, phys_x_map;
|
|
* #define set1(a) x_map = a
|
|
* inline void set2(int a) { x_map = a; }
|
|
* #define x_map phys_x_map
|
|
* main(){ set1(3); set2(5); }
|
|
*/
|
|
|
|
extern cpumask_t cpu_possible_map;
|
|
extern cpumask_t cpu_online_map;
|
|
extern cpumask_t cpu_present_map;
|
|
extern cpumask_t cpu_active_map;
|
|
|
|
#if NR_CPUS > 1
|
|
#define num_online_cpus() cpus_weight_nr(cpu_online_map)
|
|
#define num_possible_cpus() cpus_weight_nr(cpu_possible_map)
|
|
#define num_present_cpus() cpus_weight_nr(cpu_present_map)
|
|
#define cpu_online(cpu) cpu_isset((cpu), cpu_online_map)
|
|
#define cpu_possible(cpu) cpu_isset((cpu), cpu_possible_map)
|
|
#define cpu_present(cpu) cpu_isset((cpu), cpu_present_map)
|
|
#define cpu_active(cpu) cpu_isset((cpu), cpu_active_map)
|
|
#else
|
|
#define num_online_cpus() 1
|
|
#define num_possible_cpus() 1
|
|
#define num_present_cpus() 1
|
|
#define cpu_online(cpu) ((cpu) == 0)
|
|
#define cpu_possible(cpu) ((cpu) == 0)
|
|
#define cpu_present(cpu) ((cpu) == 0)
|
|
#define cpu_active(cpu) ((cpu) == 0)
|
|
#endif
|
|
|
|
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
|
|
|
|
#define for_each_possible_cpu(cpu) for_each_cpu_mask_nr((cpu), cpu_possible_map)
|
|
#define for_each_online_cpu(cpu) for_each_cpu_mask_nr((cpu), cpu_online_map)
|
|
#define for_each_present_cpu(cpu) for_each_cpu_mask_nr((cpu), cpu_present_map)
|
|
|
|
/* These are the new versions of the cpumask operators: passed by pointer.
|
|
* The older versions will be implemented in terms of these, then deleted. */
|
|
#define cpumask_bits(maskp) ((maskp)->bits)
|
|
|
|
#if NR_CPUS <= BITS_PER_LONG
|
|
#define CPU_BITS_ALL \
|
|
{ \
|
|
[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
|
|
}
|
|
|
|
/* This produces more efficient code. */
|
|
#define nr_cpumask_bits 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] = CPU_MASK_LAST_WORD \
|
|
}
|
|
|
|
#define nr_cpumask_bits nr_cpu_ids
|
|
#endif /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
/* verify cpu argument to cpumask_* operators */
|
|
static inline unsigned int cpumask_check(unsigned int cpu)
|
|
{
|
|
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
|
|
WARN_ON_ONCE(cpu >= nr_cpumask_bits);
|
|
#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
|
|
return cpu;
|
|
}
|
|
|
|
#if NR_CPUS == 1
|
|
/* Uniprocessor. Assume all masks are "1". */
|
|
static inline unsigned int cpumask_first(const struct cpumask *srcp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* Valid inputs for n are -1 and 0. */
|
|
static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
|
|
{
|
|
return n+1;
|
|
}
|
|
|
|
static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
|
|
{
|
|
return n+1;
|
|
}
|
|
|
|
static inline unsigned int cpumask_next_and(int n,
|
|
const struct cpumask *srcp,
|
|
const struct cpumask *andp)
|
|
{
|
|
return n+1;
|
|
}
|
|
|
|
/* cpu must be a valid cpu, ie 0, so there's no other choice. */
|
|
static inline unsigned int cpumask_any_but(const struct cpumask *mask,
|
|
unsigned int cpu)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
#define for_each_cpu(cpu, mask) \
|
|
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
|
|
#define for_each_cpu_and(cpu, mask, and) \
|
|
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
|
|
#else
|
|
/**
|
|
* 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), nr_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), nr_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), nr_cpumask_bits, n+1);
|
|
}
|
|
|
|
int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
|
|
int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
|
|
|
|
/**
|
|
* 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 ((cpu) = -1; \
|
|
(cpu) = cpumask_next((cpu), (mask)), \
|
|
(cpu) < nr_cpu_ids;)
|
|
|
|
/**
|
|
* for_each_cpu_and - iterate over every cpu in both masks
|
|
* @cpu: the (optionally unsigned) integer iterator
|
|
* @mask: the first cpumask pointer
|
|
* @and: the second cpumask pointer
|
|
*
|
|
* This saves a temporary CPU mask in many places. It is equivalent to:
|
|
* struct cpumask tmp;
|
|
* cpumask_and(&tmp, &mask, &and);
|
|
* for_each_cpu(cpu, &tmp)
|
|
* ...
|
|
*
|
|
* After the loop, cpu is >= nr_cpu_ids.
|
|
*/
|
|
#define for_each_cpu_and(cpu, mask, and) \
|
|
for ((cpu) = -1; \
|
|
(cpu) = cpumask_next_and((cpu), (mask), (and)), \
|
|
(cpu) < nr_cpu_ids;)
|
|
#endif /* SMP */
|
|
|
|
#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 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 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
|
|
*
|
|
* No static inline type checking - see Subtlety (1) above.
|
|
*/
|
|
#define cpumask_test_cpu(cpu, cpumask) \
|
|
test_bit(cpumask_check(cpu), (cpumask)->bits)
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
|
|
{
|
|
return test_and_set_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)
|
|
{
|
|
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), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_and - *dstp = *src1p & *src2p
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static inline void cpumask_and(struct cpumask *dstp,
|
|
const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
|
|
cpumask_bits(src2p), nr_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), nr_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), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_andnot - *dstp = *src1p & ~*src2p
|
|
* @dstp: the cpumask result
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static inline void cpumask_andnot(struct cpumask *dstp,
|
|
const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
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_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
|
|
*/
|
|
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)
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|
{
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return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
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}
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|
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/**
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* cpumask_shift_right - *dstp = *srcp >> n
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* @dstp: the cpumask result
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* @srcp: the input to shift
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* @n: the number of bits to shift by
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|
*/
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static inline void cpumask_shift_right(struct cpumask *dstp,
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const struct cpumask *srcp, int n)
|
|
{
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bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
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nr_cpumask_bits);
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}
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|
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/**
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* cpumask_shift_left - *dstp = *srcp << n
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* @dstp: the cpumask result
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* @srcp: the input to shift
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* @n: the number of bits to shift by
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|
*/
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static inline void cpumask_shift_left(struct cpumask *dstp,
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const struct cpumask *srcp, int n)
|
|
{
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|
bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
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nr_cpumask_bits);
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}
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|
|
|
/**
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|
* cpumask_copy - *dstp = *srcp
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* @dstp: the result
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|
* @srcp: the input cpumask
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|
*/
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|
static inline void cpumask_copy(struct cpumask *dstp,
|
|
const struct cpumask *srcp)
|
|
{
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|
bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
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|
}
|
|
|
|
/**
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|
* cpumask_any - pick a "random" cpu from *srcp
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* @srcp: the input cpumask
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|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
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|
#define cpumask_any(srcp) cpumask_first(srcp)
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|
|
|
/**
|
|
* 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().
|
|
*/
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|
#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))
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* cpumask_size - size to allocate for a 'struct cpumask' in bytes
|
|
*
|
|
* This will eventually be a runtime variable, depending on nr_cpu_ids.
|
|
*/
|
|
static inline size_t cpumask_size(void)
|
|
{
|
|
/* FIXME: Once all cpumask assignments are eliminated, this
|
|
* can be nr_cpumask_bits */
|
|
return BITS_TO_LONGS(NR_CPUS) * 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);
|
|
*/
|
|
#ifdef CONFIG_CPUMASK_OFFSTACK
|
|
typedef struct cpumask *cpumask_var_t;
|
|
|
|
bool alloc_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);
|
|
|
|
#else
|
|
typedef struct cpumask cpumask_var_t[1];
|
|
|
|
static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
|
|
{
|
|
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)
|
|
{
|
|
}
|
|
#endif /* CONFIG_CPUMASK_OFFSTACK */
|
|
|
|
/* The pointer versions of the maps, these will become the primary versions. */
|
|
#define cpu_possible_mask ((const struct cpumask *)&cpu_possible_map)
|
|
#define cpu_online_mask ((const struct cpumask *)&cpu_online_map)
|
|
#define cpu_present_mask ((const struct cpumask *)&cpu_present_map)
|
|
#define cpu_active_mask ((const struct cpumask *)&cpu_active_map)
|
|
|
|
/* 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])
|
|
|
|
/* Wrappers for arch boot code to manipulate normally-constant masks */
|
|
static inline void set_cpu_possible(unsigned int cpu, bool possible)
|
|
{
|
|
if (possible)
|
|
cpumask_set_cpu(cpu, &cpu_possible_map);
|
|
else
|
|
cpumask_clear_cpu(cpu, &cpu_possible_map);
|
|
}
|
|
|
|
static inline void set_cpu_present(unsigned int cpu, bool present)
|
|
{
|
|
if (present)
|
|
cpumask_set_cpu(cpu, &cpu_present_map);
|
|
else
|
|
cpumask_clear_cpu(cpu, &cpu_present_map);
|
|
}
|
|
|
|
static inline void set_cpu_online(unsigned int cpu, bool online)
|
|
{
|
|
if (online)
|
|
cpumask_set_cpu(cpu, &cpu_online_map);
|
|
else
|
|
cpumask_clear_cpu(cpu, &cpu_online_map);
|
|
}
|
|
|
|
static inline void set_cpu_active(unsigned int cpu, bool active)
|
|
{
|
|
if (active)
|
|
cpumask_set_cpu(cpu, &cpu_active_map);
|
|
else
|
|
cpumask_clear_cpu(cpu, &cpu_active_map);
|
|
}
|
|
|
|
static inline void init_cpu_present(const struct cpumask *src)
|
|
{
|
|
cpumask_copy(&cpu_present_map, src);
|
|
}
|
|
|
|
static inline void init_cpu_possible(const struct cpumask *src)
|
|
{
|
|
cpumask_copy(&cpu_possible_map, src);
|
|
}
|
|
|
|
static inline void init_cpu_online(const struct cpumask *src)
|
|
{
|
|
cpumask_copy(&cpu_online_map, src);
|
|
}
|
|
#endif /* __LINUX_CPUMASK_H */
|