diff options
Diffstat (limited to 'include/linux/cpumask.h')
| -rw-r--r-- | include/linux/cpumask.h | 239 |
1 files changed, 177 insertions, 62 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 36a890d0dd57..80211900f373 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -7,14 +7,16 @@ * set of CPUs in a system, one bit position per CPU number. In general, * only nr_cpu_ids (<= NR_CPUS) bits are valid. */ -#include <linux/cleanup.h> -#include <linux/kernel.h> +#include <linux/atomic.h> #include <linux/bitmap.h> +#include <linux/cleanup.h> #include <linux/cpumask_types.h> -#include <linux/atomic.h> -#include <linux/bug.h> #include <linux/gfp_types.h> #include <linux/numa.h> +#include <linux/threads.h> +#include <linux/types.h> + +#include <asm/bug.h> /** * cpumask_pr_args - printf args to output a cpumask @@ -81,7 +83,7 @@ static __always_inline void set_nr_cpu_ids(unsigned int nr) * * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable * cpu_present_mask - has bit 'cpu' set iff cpu is populated - * cpu_enabled_mask - has bit 'cpu' set iff cpu can be brought online + * cpu_enabled_mask - has bit 'cpu' set iff cpu can be brought online * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler * cpu_active_mask - has bit 'cpu' set iff cpu available to migration * @@ -126,6 +128,7 @@ extern struct cpumask __cpu_dying_mask; #define cpu_dying_mask ((const struct cpumask *)&__cpu_dying_mask) extern atomic_t __num_online_cpus; +extern unsigned int __num_possible_cpus; extern cpumask_t cpus_booted_once_mask; @@ -179,6 +182,19 @@ unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask } /** + * cpumask_first_andnot - return the first cpu from *srcp1 & ~*srcp2 + * @srcp1: the first input + * @srcp2: the second input + * + * Return: >= nr_cpu_ids if no such cpu found. + */ +static __always_inline +unsigned int cpumask_first_andnot(const struct cpumask *srcp1, const struct cpumask *srcp2) +{ + return find_first_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits); +} + +/** * cpumask_first_and_and - return the first cpu from *srcp1 & *srcp2 & *srcp3 * @srcp1: the first input * @srcp2: the second input @@ -285,35 +301,83 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p, } /** - * for_each_cpu - iterate over every cpu in a mask - * @cpu: the (optionally unsigned) integer iterator - * @mask: the cpumask pointer + * cpumask_next_andnot - get the next cpu in *src1p & ~*src2p + * @n: the cpu prior to the place to search (i.e. return will be > @n) + * @src1p: the first cpumask pointer + * @src2p: the second cpumask pointer * - * After the loop, cpu is >= nr_cpu_ids. + * Return: >= nr_cpu_ids if no further cpus set in both. */ -#define for_each_cpu(cpu, mask) \ - for_each_set_bit(cpu, cpumask_bits(mask), small_cpumask_bits) +static __always_inline +unsigned int cpumask_next_andnot(int n, const struct cpumask *src1p, + const struct cpumask *src2p) +{ + /* -1 is a legal arg here. */ + if (n != -1) + cpumask_check(n); + return find_next_andnot_bit(cpumask_bits(src1p), cpumask_bits(src2p), + small_cpumask_bits, n + 1); +} -#if NR_CPUS == 1 +/** + * cpumask_next_and_wrap - get the next cpu in *src1p & *src2p, starting from + * @n+1. If nothing found, wrap around and start from + * the beginning + * @n: the cpu prior to the place to search (i.e. search starts from @n+1) + * @src1p: the first cpumask pointer + * @src2p: the second cpumask pointer + * + * Return: next set bit, wrapped if needed, or >= nr_cpu_ids if @src1p & @src2p is empty. + */ static __always_inline -unsigned int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap) +unsigned int cpumask_next_and_wrap(int n, const struct cpumask *src1p, + const struct cpumask *src2p) { - cpumask_check(start); + /* -1 is a legal arg here. */ if (n != -1) cpumask_check(n); + return find_next_and_bit_wrap(cpumask_bits(src1p), cpumask_bits(src2p), + small_cpumask_bits, n + 1); +} - /* - * Return the first available CPU when wrapping, or when starting before cpu0, - * since there is only one valid option. - */ - if (wrap && n >= 0) - return nr_cpumask_bits; +/** + * cpumask_next_wrap - get the next cpu in *src, starting from @n+1. If nothing + * found, wrap around and start from the beginning + * @n: the cpu prior to the place to search (i.e. search starts from @n+1) + * @src: cpumask pointer + * + * Return: next set bit, wrapped if needed, or >= nr_cpu_ids if @src is empty. + */ +static __always_inline +unsigned int cpumask_next_wrap(int n, const struct cpumask *src) +{ + /* -1 is a legal arg here. */ + if (n != -1) + cpumask_check(n); + return find_next_bit_wrap(cpumask_bits(src), small_cpumask_bits, n + 1); +} - return cpumask_first(mask); +/** + * cpumask_random - get random cpu in *src. + * @src: cpumask pointer + * + * Return: random set bit, or >= nr_cpu_ids if @src is empty. + */ +static __always_inline +unsigned int cpumask_random(const struct cpumask *src) +{ + return find_random_bit(cpumask_bits(src), nr_cpu_ids); } -#else -unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap); -#endif + +/** + * for_each_cpu - iterate over every cpu in a mask + * @cpu: the (optionally unsigned) integer iterator + * @mask: the cpumask pointer + * + * After the loop, cpu is >= nr_cpu_ids. + */ +#define for_each_cpu(cpu, mask) \ + for_each_set_bit(cpu, cpumask_bits(mask), small_cpumask_bits) /** * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location @@ -396,14 +460,18 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta * @cpu: the cpu to ignore. * * Often used to find any cpu but smp_processor_id() in a mask. + * If @cpu == -1, the function is equivalent to cpumask_any(). * Return: >= nr_cpu_ids if no cpus set. */ static __always_inline -unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) +unsigned int cpumask_any_but(const struct cpumask *mask, int cpu) { unsigned int i; - cpumask_check(cpu); + /* -1 is a legal arg here. */ + if (cpu != -1) + cpumask_check(cpu); + for_each_cpu(i, mask) if (i != cpu) break; @@ -416,16 +484,20 @@ unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) * @mask2: the second input cpumask * @cpu: the cpu to ignore * + * If @cpu == -1, the function is equivalent to cpumask_any_and(). * Returns >= nr_cpu_ids if no cpus set. */ static __always_inline unsigned int cpumask_any_and_but(const struct cpumask *mask1, const struct cpumask *mask2, - unsigned int cpu) + int cpu) { unsigned int i; - cpumask_check(cpu); + /* -1 is a legal arg here. */ + if (cpu != -1) + cpumask_check(cpu); + i = cpumask_first_and(mask1, mask2); if (i != cpu) return i; @@ -434,36 +506,47 @@ unsigned int cpumask_any_and_but(const struct cpumask *mask1, } /** - * cpumask_nth - get the Nth cpu in a cpumask - * @srcp: the cpumask pointer - * @cpu: the Nth cpu to find, starting from 0 + * cpumask_any_andnot_but - pick an arbitrary cpu from *mask1 & ~*mask2, but not this one. + * @mask1: the first input cpumask + * @mask2: the second input cpumask + * @cpu: the cpu to ignore * - * Return: >= nr_cpu_ids if such cpu doesn't exist. + * If @cpu == -1, the function returns the first matching cpu. + * Returns >= nr_cpu_ids if no cpus set. */ static __always_inline -unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp) +unsigned int cpumask_any_andnot_but(const struct cpumask *mask1, + const struct cpumask *mask2, + int cpu) { - return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu)); + unsigned int i; + + /* -1 is a legal arg here. */ + if (cpu != -1) + cpumask_check(cpu); + + i = cpumask_first_andnot(mask1, mask2); + if (i != cpu) + return i; + + return cpumask_next_andnot(cpu, mask1, mask2); } /** - * cpumask_nth_and - get the Nth cpu in 2 cpumasks - * @srcp1: the cpumask pointer - * @srcp2: the cpumask pointer + * cpumask_nth - get the Nth cpu in a cpumask + * @srcp: the cpumask pointer * @cpu: the Nth cpu to find, starting from 0 * * Return: >= nr_cpu_ids if such cpu doesn't exist. */ static __always_inline -unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, - const struct cpumask *srcp2) +unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp) { - return find_nth_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), - small_cpumask_bits, cpumask_check(cpu)); + return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu)); } /** - * cpumask_nth_andnot - get the Nth cpu set in 1st cpumask, and clear in 2nd. + * cpumask_nth_and - get the Nth cpu in 2 cpumasks * @srcp1: the cpumask pointer * @srcp2: the cpumask pointer * @cpu: the Nth cpu to find, starting from 0 @@ -471,10 +554,10 @@ unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, * Return: >= nr_cpu_ids if such cpu doesn't exist. */ static __always_inline -unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1, +unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, const struct cpumask *srcp2) { - return find_nth_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), + return find_nth_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits, cpumask_check(cpu)); } @@ -525,6 +608,18 @@ void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) __set_bit(cpumask_check(cpu), cpumask_bits(dstp)); } +/** + * cpumask_clear_cpus - clear cpus in a cpumask + * @dstp: the cpumask pointer + * @cpu: cpu number (< nr_cpu_ids) + * @ncpus: number of cpus to clear (< nr_cpu_ids) + */ +static __always_inline void cpumask_clear_cpus(struct cpumask *dstp, + unsigned int cpu, unsigned int ncpus) +{ + cpumask_check(cpu + ncpus - 1); + bitmap_clear(cpumask_bits(dstp), cpumask_check(cpu), ncpus); +} /** * cpumask_clear_cpu - clear a cpu in a cpumask @@ -542,22 +637,6 @@ static __always_inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp) } /** - * cpumask_assign_cpu - assign a cpu in a cpumask - * @cpu: cpu number (< nr_cpu_ids) - * @dstp: the cpumask pointer - * @bool: the value to assign - */ -static __always_inline void cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value) -{ - assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value); -} - -static __always_inline void __cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value) -{ - __assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value); -} - -/** * cpumask_test_cpu - test for a cpu in a cpumask * @cpu: cpu number (< nr_cpu_ids) * @cpumask: the cpumask pointer @@ -653,6 +732,22 @@ void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, } /** + * cpumask_weighted_or - *dstp = *src1p | *src2p and return the weight of the result + * @dstp: the cpumask result + * @src1p: the first input + * @src2p: the second input + * + * Return: The number of bits set in the resulting cpumask @dstp + */ +static __always_inline +unsigned int cpumask_weighted_or(struct cpumask *dstp, const struct cpumask *src1p, + const struct cpumask *src2p) +{ + return bitmap_weighted_or(cpumask_bits(dstp), cpumask_bits(src1p), + cpumask_bits(src2p), small_cpumask_bits); +} + +/** * cpumask_xor - *dstp = *src1p ^ *src2p * @dstp: the cpumask result * @src1p: the first input @@ -929,6 +1024,7 @@ static __always_inline unsigned int cpumask_size(void) #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x) #define __cpumask_var_read_mostly __read_mostly +#define CPUMASK_VAR_NULL NULL bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); @@ -975,6 +1071,7 @@ static __always_inline bool cpumask_available(cpumask_var_t mask) #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x) #define __cpumask_var_read_mostly +#define CPUMASK_VAR_NULL {} static __always_inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { @@ -1033,11 +1130,21 @@ extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); #define for_each_possible_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++) #define for_each_online_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++) #define for_each_present_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++) + +#define for_each_possible_cpu_wrap(cpu, start) \ + for ((void)(start), (cpu) = 0; (cpu) < 1; (cpu)++) +#define for_each_online_cpu_wrap(cpu, start) \ + for ((void)(start), (cpu) = 0; (cpu) < 1; (cpu)++) #else #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) #define for_each_enabled_cpu(cpu) for_each_cpu((cpu), cpu_enabled_mask) #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) + +#define for_each_possible_cpu_wrap(cpu, start) \ + for_each_cpu_wrap((cpu), cpu_possible_mask, (start)) +#define for_each_online_cpu_wrap(cpu, start) \ + for_each_cpu_wrap((cpu), cpu_online_mask, (start)) #endif /* Wrappers for arch boot code to manipulate normally-constant masks */ @@ -1047,13 +1154,16 @@ void init_cpu_possible(const struct cpumask *src); #define assign_cpu(cpu, mask, val) \ assign_bit(cpumask_check(cpu), cpumask_bits(mask), (val)) -#define set_cpu_possible(cpu, possible) assign_cpu((cpu), &__cpu_possible_mask, (possible)) +#define __assign_cpu(cpu, mask, val) \ + __assign_bit(cpumask_check(cpu), cpumask_bits(mask), (val)) + #define set_cpu_enabled(cpu, enabled) assign_cpu((cpu), &__cpu_enabled_mask, (enabled)) #define set_cpu_present(cpu, present) assign_cpu((cpu), &__cpu_present_mask, (present)) #define set_cpu_active(cpu, active) assign_cpu((cpu), &__cpu_active_mask, (active)) #define set_cpu_dying(cpu, dying) assign_cpu((cpu), &__cpu_dying_mask, (dying)) void set_cpu_online(unsigned int cpu, bool online); +void set_cpu_possible(unsigned int cpu, bool possible); /** * to_cpumask - convert a NR_CPUS bitmap to a struct cpumask * @@ -1106,7 +1216,12 @@ static __always_inline unsigned int num_online_cpus(void) { return raw_atomic_read(&__num_online_cpus); } -#define num_possible_cpus() cpumask_weight(cpu_possible_mask) + +static __always_inline unsigned int num_possible_cpus(void) +{ + return __num_possible_cpus; +} + #define num_enabled_cpus() cpumask_weight(cpu_enabled_mask) #define num_present_cpus() cpumask_weight(cpu_present_mask) #define num_active_cpus() cpumask_weight(cpu_active_mask) |