path: root/include/linux/cpumask.h

#ifndef __LINUX_CPUMASK_H
#define __LINUX_CPUMASK_H

#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/bitmap.h>
#include <linux/bug.h>

typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;

#define cpumask_bits(maskp) ((maskp)->bits)

#if NR_CPUS == 1
#define nr_cpu_ids		1
#else
extern int nr_cpu_ids;
#endif

#ifdef CONFIG_CPUMASK_OFFSTACK
#define nr_cpumask_bits	nr_cpu_ids
#else
#define nr_cpumask_bits	NR_CPUS
#endif


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;

#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 num_active_cpus()	cpumask_weight(cpu_active_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()	1U
#define num_possible_cpus()	1U
#define num_present_cpus()	1U
#define num_active_cpus()	1U
#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

static inline unsigned int cpumask_check(unsigned int cpu)
{
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
	WARN_ON_ONCE(cpu >= nr_cpumask_bits);
#endif 
	return cpu;
}

#if NR_CPUS == 1
static inline unsigned int cpumask_first(const struct cpumask *srcp)
{
	return 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;
}

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_not(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
static inline unsigned int cpumask_first(const struct cpumask *srcp)
{
	return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
}

static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
{
	
	if (n != -1)
		cpumask_check(n);
	return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
}

static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
{
	
	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);

#define for_each_cpu(cpu, mask)				\
	for ((cpu) = -1;				\
		(cpu) = cpumask_next((cpu), (mask)),	\
		(cpu) < nr_cpu_ids;)

#define for_each_cpu_not(cpu, mask)				\
	for ((cpu) = -1;					\
		(cpu) = cpumask_next_zero((cpu), (mask)),	\
		(cpu) < 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 

#define CPU_BITS_NONE						\
{								\
	[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL			\
}

#define CPU_BITS_CPU0						\
{								\
	[0] =  1UL						\
}

static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
{
	set_bit(cpumask_check(cpu), cpumask_bits(dstp));
}

static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
{
	clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
}

#define cpumask_test_cpu(cpu, cpumask) \
	test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))

static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
{
	return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
}

static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
{
	return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
}

static inline void cpumask_setall(struct cpumask *dstp)
{
	bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
}

static inline void cpumask_clear(struct cpumask *dstp)
{
	bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
}

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);
}

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);
}

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);
}

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);
}

static inline void cpumask_complement(struct cpumask *dstp,
				      const struct cpumask *srcp)
{
	bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
					      nr_cpumask_bits);
}

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);
}

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);
}

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);
}

static inline bool cpumask_empty(const struct cpumask *srcp)
{
	return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
}

static inline bool cpumask_full(const struct cpumask *srcp)
{
	return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
}

static inline unsigned int cpumask_weight(const struct cpumask *srcp)
{
	return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
}

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);
}

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);
}

static inline void cpumask_copy(struct cpumask *dstp,
				const struct cpumask *srcp)
{
	bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
}

#define cpumask_any(srcp) cpumask_first(srcp)

#define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))

#define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))

#define cpumask_of(cpu) (get_cpu_mask(cpu))

static inline int cpumask_scnprintf(char *buf, int len,
				    const struct cpumask *srcp)
{
	return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
}

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);
}

static inline int cpumask_parselist_user(const char __user *buf, int len,
				     struct cpumask *dstp)
{
	return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
							nr_cpumask_bits);
}

static inline int cpulist_scnprintf(char *buf, int len,
				    const struct cpumask *srcp)
{
	return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
				    nr_cpumask_bits);
}

static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
{
	return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
}

static inline size_t cpumask_size(void)
{
	return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
}

#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 

extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
#define cpu_all_mask to_cpumask(cpu_all_bits)

#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)

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);

#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;
}

extern const unsigned long
	cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];

static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
{
	const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
	p -= cpu / BITS_PER_LONG;
	return to_cpumask(p);
}

#define cpu_is_offline(cpu)	unlikely(!cpu_online(cpu))

#if NR_CPUS <= BITS_PER_LONG
#define CPU_BITS_ALL						\
{								\
	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD	\
}

#else 

#define CPU_BITS_ALL						\
{								\
	[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,		\
	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD		\
}
#endif 

#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))

#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)

#if NR_CPUS <= BITS_PER_LONG

#define CPU_MASK_ALL							\
(cpumask_t) { {								\
	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD			\
} }

#else

#define CPU_MASK_ALL							\
(cpumask_t) { {								\
	[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,			\
	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD			\
} }

#endif

#define CPU_MASK_NONE							\
(cpumask_t) { {								\
	[0 ... BITS_TO_LONGS(NR_CPUS)-1] =  0UL				\
} }

#define CPU_MASK_CPU0							\
(cpumask_t) { {								\
	[0] =  1UL							\
} }

#if NR_CPUS == 1
#define first_cpu(src)		({ (void)(src); 0; })
#define next_cpu(n, src)	({ (void)(src); 1; })
#define any_online_cpu(mask)	0
#define for_each_cpu_mask(cpu, mask)	\
	for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
#else 
int __first_cpu(const cpumask_t *srcp);
int __next_cpu(int n, const cpumask_t *srcp);

#define first_cpu(src)		__first_cpu(&(src))
#define next_cpu(n, src)	__next_cpu((n), &(src))
#define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_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 for_each_cpu_mask_nr(cpu, mask)	for_each_cpu_mask(cpu, mask)

#else 

int __next_cpu_nr(int n, const cpumask_t *srcp);
#define for_each_cpu_mask_nr(cpu, mask)			\
	for ((cpu) = -1;				\
		(cpu) = __next_cpu_nr((cpu), &(mask)),	\
		(cpu) < nr_cpu_ids; )

#endif 

#define cpus_addr(src) ((src).bits)

#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
{
	set_bit(cpu, dstp->bits);
}

#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
{
	clear_bit(cpu, dstp->bits);
}

#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
static inline void __cpus_setall(cpumask_t *dstp, int nbits)
{
	bitmap_fill(dstp->bits, nbits);
}

#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
static inline void __cpus_clear(cpumask_t *dstp, int nbits)
{
	bitmap_zero(dstp->bits, nbits);
}

#define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)

#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
{
	return test_and_set_bit(cpu, addr->bits);
}

#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
					const cpumask_t *src2p, int nbits)
{
	return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
}

#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
					const cpumask_t *src2p, int nbits)
{
	bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
}

#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
					const cpumask_t *src2p, int nbits)
{
	bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
}

#define cpus_andnot(dst, src1, src2) \
				__cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
					const cpumask_t *src2p, int nbits)
{
	return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
}

#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
static inline int __cpus_equal(const cpumask_t *src1p,
					const cpumask_t *src2p, int nbits)
{
	return bitmap_equal(src1p->bits, src2p->bits, nbits);
}

#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
static inline int __cpus_intersects(const cpumask_t *src1p,
					const cpumask_t *src2p, int nbits)
{
	return bitmap_intersects(src1p->bits, src2p->bits, nbits);
}

#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
static inline int __cpus_subset(const cpumask_t *src1p,
					const cpumask_t *src2p, int nbits)
{
	return bitmap_subset(src1p->bits, src2p->bits, nbits);
}

#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
{
	return bitmap_empty(srcp->bits, nbits);
}

#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
{
	return bitmap_weight(srcp->bits, nbits);
}

#define cpus_shift_left(dst, src, n) \
			__cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
static inline void __cpus_shift_left(cpumask_t *dstp,
					const cpumask_t *srcp, int n, int nbits)
{
	bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
}
#endif 

#endif