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f4b0373b26
When 'and'ing two bitmasks (where 'andnot' is a variation on it), some cases want to know whether the result is the empty set or not. In particular, the TLB IPI sending code wants to do cpumask operations and determine if there are any CPU's left in the final set. So this just makes the bitmask (and cpumask) functions return a boolean for whether the result has any bits set. Cc: stable@kernel.org (2.6.30, needed by TLB shootdown fix) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1092 lines
33 KiB
C
1092 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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* int 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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* int 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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#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
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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 int __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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return 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 int __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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return 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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#endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
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/**
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* to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
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* @bitmap: the bitmap
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*
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* There are a few places where cpumask_var_t isn't appropriate and
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* static cpumasks must be used (eg. very early boot), yet we don't
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* expose the definition of 'struct cpumask'.
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*
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* This does the conversion, and can be used as a constant initializer.
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*/
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#define to_cpumask(bitmap) \
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((struct cpumask *)(1 ? (bitmap) \
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: (void *)sizeof(__check_is_bitmap(bitmap))))
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static inline int __check_is_bitmap(const unsigned long *bitmap)
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{
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return 1;
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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 struct cpumask *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 to_cpumask(p);
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}
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#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
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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 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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#endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
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#if NR_CPUS == 1
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#define nr_cpu_ids 1
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#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
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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
|
|
#define for_each_cpu_mask(cpu, mask) \
|
|
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
|
|
#endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
|
|
#else /* NR_CPUS > 1 */
|
|
|
|
extern int nr_cpu_ids;
|
|
#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
|
|
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 /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
|
|
#endif
|
|
|
|
#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
|
|
#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 */
|
|
#endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
|
|
|
|
/*
|
|
* 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_possible_mask 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_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 const struct cpumask *const cpu_possible_mask;
|
|
extern const struct cpumask *const cpu_online_mask;
|
|
extern const struct cpumask *const cpu_present_mask;
|
|
extern const struct cpumask *const cpu_active_mask;
|
|
|
|
/* These strip const, as traditionally they weren't const. */
|
|
#define cpu_possible_map (*(cpumask_t *)cpu_possible_mask)
|
|
#define cpu_online_map (*(cpumask_t *)cpu_online_mask)
|
|
#define cpu_present_map (*(cpumask_t *)cpu_present_mask)
|
|
#define cpu_active_map (*(cpumask_t *)cpu_active_mask)
|
|
|
|
#if NR_CPUS > 1
|
|
#define num_online_cpus() cpumask_weight(cpu_online_mask)
|
|
#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
|
|
#define num_present_cpus() cpumask_weight(cpu_present_mask)
|
|
#define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
|
|
#define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
|
|
#define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
|
|
#define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
|
|
#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))
|
|
|
|
/* 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 \
|
|
}
|
|
|
|
#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 \
|
|
}
|
|
#endif /* NR_CPUS > BITS_PER_LONG */
|
|
|
|
#ifdef CONFIG_CPUMASK_OFFSTACK
|
|
/* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
|
|
* not all bits may be allocated. */
|
|
#define nr_cpumask_bits nr_cpu_ids
|
|
#else
|
|
#define nr_cpumask_bits NR_CPUS
|
|
#endif
|
|
|
|
/* 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)))
|
|
|
|
/**
|
|
* 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 int 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), 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 int cpumask_andnot(struct cpumask *dstp,
|
|
const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
|
|
cpumask_bits(src2p), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_complement - *dstp = ~*srcp
|
|
* @dstp: the cpumask result
|
|
* @srcp: the input to invert
|
|
*/
|
|
static inline void cpumask_complement(struct cpumask *dstp,
|
|
const struct cpumask *srcp)
|
|
{
|
|
bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_equal - *src1p == *src2p
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*/
|
|
static inline bool cpumask_equal(const struct cpumask *src1p,
|
|
const struct cpumask *src2p)
|
|
{
|
|
return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_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)
|
|
{
|
|
return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_shift_right - *dstp = *srcp >> n
|
|
* @dstp: the cpumask result
|
|
* @srcp: the input to shift
|
|
* @n: the number of bits to shift by
|
|
*/
|
|
static inline void cpumask_shift_right(struct cpumask *dstp,
|
|
const struct cpumask *srcp, int n)
|
|
{
|
|
bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_shift_left - *dstp = *srcp << n
|
|
* @dstp: the cpumask result
|
|
* @srcp: the input to shift
|
|
* @n: the number of bits to shift by
|
|
*/
|
|
static inline void cpumask_shift_left(struct cpumask *dstp,
|
|
const struct cpumask *srcp, int n)
|
|
{
|
|
bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_copy - *dstp = *srcp
|
|
* @dstp: the result
|
|
* @srcp: the input cpumask
|
|
*/
|
|
static inline void cpumask_copy(struct cpumask *dstp,
|
|
const struct cpumask *srcp)
|
|
{
|
|
bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpumask_any - pick a "random" cpu from *srcp
|
|
* @srcp: the input cpumask
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
#define cpumask_any(srcp) cpumask_first(srcp)
|
|
|
|
/**
|
|
* cpumask_first_and - return the first cpu from *srcp1 & *srcp2
|
|
* @src1p: the first input
|
|
* @src2p: the second input
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
|
|
*/
|
|
#define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
|
|
|
|
/**
|
|
* cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
|
|
* @mask1: the first input cpumask
|
|
* @mask2: the second input cpumask
|
|
*
|
|
* Returns >= nr_cpu_ids if no cpus set.
|
|
*/
|
|
#define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
|
|
|
|
/**
|
|
* cpumask_of - the cpumask containing just a given cpu
|
|
* @cpu: the cpu (<= nr_cpu_ids)
|
|
*/
|
|
#define cpumask_of(cpu) (get_cpu_mask(cpu))
|
|
|
|
/**
|
|
* cpumask_scnprintf - print a cpumask into a string as comma-separated hex
|
|
* @buf: the buffer to sprintf into
|
|
* @len: the length of the buffer
|
|
* @srcp: the cpumask to print
|
|
*
|
|
* If len is zero, returns zero. Otherwise returns the length of the
|
|
* (nul-terminated) @buf string.
|
|
*/
|
|
static inline int cpumask_scnprintf(char *buf, int len,
|
|
const struct cpumask *srcp)
|
|
{
|
|
return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* cpulist_scnprintf - print a cpumask into a string as comma-separated list
|
|
* @buf: the buffer to sprintf into
|
|
* @len: the length of the buffer
|
|
* @srcp: the cpumask to print
|
|
*
|
|
* If len is zero, returns zero. Otherwise returns the length of the
|
|
* (nul-terminated) @buf string.
|
|
*/
|
|
static inline int cpulist_scnprintf(char *buf, int len,
|
|
const struct cpumask *srcp)
|
|
{
|
|
return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
|
|
nr_cpumask_bits);
|
|
}
|
|
|
|
/**
|
|
* cpulist_parse_user - extract a cpumask from a user string of ranges
|
|
* @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 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
|
|
*
|
|
* 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_node(cpumask_var_t *mask, gfp_t flags, int node);
|
|
bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
|
|
bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
|
|
bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
|
|
void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
|
|
void free_cpumask_var(cpumask_var_t mask);
|
|
void free_bootmem_cpumask_var(cpumask_var_t mask);
|
|
|
|
#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 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)
|
|
{
|
|
}
|
|
#endif /* CONFIG_CPUMASK_OFFSTACK */
|
|
|
|
/* It's common to want to use cpu_all_mask in struct member initializers,
|
|
* so it has to refer to an address rather than a pointer. */
|
|
extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
|
|
#define cpu_all_mask to_cpumask(cpu_all_bits)
|
|
|
|
/* First bits of cpu_bit_bitmap are in fact unset. */
|
|
#define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
|
|
|
|
#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
|
|
#define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
|
|
#define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
|
|
|
|
/* Wrappers for arch boot code to manipulate normally-constant masks */
|
|
void set_cpu_possible(unsigned int cpu, bool possible);
|
|
void set_cpu_present(unsigned int cpu, bool present);
|
|
void set_cpu_online(unsigned int cpu, bool online);
|
|
void set_cpu_active(unsigned int cpu, bool active);
|
|
void init_cpu_present(const struct cpumask *src);
|
|
void init_cpu_possible(const struct cpumask *src);
|
|
void init_cpu_online(const struct cpumask *src);
|
|
#endif /* __LINUX_CPUMASK_H */
|