/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_NODEMASK_H #define __LINUX_NODEMASK_H /* * Nodemasks provide a bitmap suitable for representing the * set of Node's in a system, one bit position per Node number. * * See detailed comments in the file linux/bitmap.h describing the * data type on which these nodemasks are based. * * For details of nodemask_parse_user(), see bitmap_parse_user() in * lib/bitmap.c. For details of nodelist_parse(), see bitmap_parselist(), * also in bitmap.c. For details of node_remap(), see bitmap_bitremap in * lib/bitmap.c. For details of nodes_remap(), see bitmap_remap in * lib/bitmap.c. For details of nodes_onto(), see bitmap_onto in * lib/bitmap.c. For details of nodes_fold(), see bitmap_fold in * lib/bitmap.c. * * The available nodemask operations are: * * void node_set(node, mask) turn on bit 'node' in mask * void node_clear(node, mask) turn off bit 'node' in mask * void nodes_setall(mask) set all bits * void nodes_clear(mask) clear all bits * int node_isset(node, mask) true iff bit 'node' set in mask * int node_test_and_set(node, mask) test and set bit 'node' in mask * * void nodes_and(dst, src1, src2) dst = src1 & src2 [intersection] * void nodes_or(dst, src1, src2) dst = src1 | src2 [union] * void nodes_xor(dst, src1, src2) dst = src1 ^ src2 * void nodes_andnot(dst, src1, src2) dst = src1 & ~src2 * void nodes_complement(dst, src) dst = ~src * * int nodes_equal(mask1, mask2) Does mask1 == mask2? * int nodes_intersects(mask1, mask2) Do mask1 and mask2 intersect? * int nodes_subset(mask1, mask2) Is mask1 a subset of mask2? * int nodes_empty(mask) Is mask empty (no bits sets)? * int nodes_full(mask) Is mask full (all bits sets)? * int nodes_weight(mask) Hamming weight - number of set bits * * void nodes_shift_right(dst, src, n) Shift right * void nodes_shift_left(dst, src, n) Shift left * * unsigned int first_node(mask) Number lowest set bit, or MAX_NUMNODES * unsigend int next_node(node, mask) Next node past 'node', or MAX_NUMNODES * unsigned int next_node_in(node, mask) Next node past 'node', or wrap to first, * or MAX_NUMNODES * unsigned int first_unset_node(mask) First node not set in mask, or * MAX_NUMNODES * * nodemask_t nodemask_of_node(node) Return nodemask with bit 'node' set * NODE_MASK_ALL Initializer - all bits set * NODE_MASK_NONE Initializer - no bits set * unsigned long *nodes_addr(mask) Array of unsigned long's in mask * * int nodemask_parse_user(ubuf, ulen, mask) Parse ascii string as nodemask * int nodelist_parse(buf, map) Parse ascii string as nodelist * int node_remap(oldbit, old, new) newbit = map(old, new)(oldbit) * void nodes_remap(dst, src, old, new) *dst = map(old, new)(src) * void nodes_onto(dst, orig, relmap) *dst = orig relative to relmap * void nodes_fold(dst, orig, sz) dst bits = orig bits mod sz * * for_each_node_mask(node, mask) for-loop node over mask * * int num_online_nodes() Number of online Nodes * int num_possible_nodes() Number of all possible Nodes * * int node_random(mask) Random node with set bit in mask * * int node_online(node) Is some node online? * int node_possible(node) Is some node possible? * * node_set_online(node) set bit 'node' in node_online_map * node_set_offline(node) clear bit 'node' in node_online_map * * for_each_node(node) for-loop node over node_possible_map * for_each_online_node(node) for-loop node over node_online_map * * Subtlety: * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway) * to generate slightly worse code. So use a simple one-line #define * for node_isset(), instead of wrapping an inline inside a macro, the * way we do the other calls. * * NODEMASK_SCRATCH * When doing above logical AND, OR, XOR, Remap operations the callers tend to * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large, * nodemask_t's consume too much stack space. NODEMASK_SCRATCH is a helper * for such situations. See below and CPUMASK_ALLOC also. */ #include <linux/threads.h> #include <linux/bitmap.h> #include <linux/minmax.h> #include <linux/nodemask_types.h> #include <linux/numa.h> #include <linux/random.h> extern nodemask_t _unused_nodemask_arg_; /** * nodemask_pr_args - printf args to output a nodemask * @maskp: nodemask to be printed * * Can be used to provide arguments for '%*pb[l]' when printing a nodemask. */ #define nodemask_pr_args(maskp) … static inline unsigned int __nodemask_pr_numnodes(const nodemask_t *m) { … } static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m) { … } /* * The inline keyword gives the compiler room to decide to inline, or * not inline a function as it sees best. However, as these functions * are called in both __init and non-__init functions, if they are not * inlined we will end up with a section mismatch error (of the type of * freeable items not being freed). So we must use __always_inline here * to fix the problem. If other functions in the future also end up in * this situation they will also need to be annotated as __always_inline */ #define node_set(node, dst) … static __always_inline void __node_set(int node, volatile nodemask_t *dstp) { … } #define node_clear(node, dst) … static inline void __node_clear(int node, volatile nodemask_t *dstp) { … } #define nodes_setall(dst) … static inline void __nodes_setall(nodemask_t *dstp, unsigned int nbits) { … } #define nodes_clear(dst) … static inline void __nodes_clear(nodemask_t *dstp, unsigned int nbits) { … } /* No static inline type checking - see Subtlety (1) above. */ #define node_isset(node, nodemask) … #define node_test_and_set(node, nodemask) … static inline bool __node_test_and_set(int node, nodemask_t *addr) { … } #define nodes_and(dst, src1, src2) … static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { … } #define nodes_or(dst, src1, src2) … static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { … } #define nodes_xor(dst, src1, src2) … static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { … } #define nodes_andnot(dst, src1, src2) … static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { … } #define nodes_complement(dst, src) … static inline void __nodes_complement(nodemask_t *dstp, const nodemask_t *srcp, unsigned int nbits) { … } #define nodes_equal(src1, src2) … static inline bool __nodes_equal(const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { … } #define nodes_intersects(src1, src2) … static inline bool __nodes_intersects(const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { … } #define nodes_subset(src1, src2) … static inline bool __nodes_subset(const nodemask_t *src1p, const nodemask_t *src2p, unsigned int nbits) { … } #define nodes_empty(src) … static inline bool __nodes_empty(const nodemask_t *srcp, unsigned int nbits) { … } #define nodes_full(nodemask) … static inline bool __nodes_full(const nodemask_t *srcp, unsigned int nbits) { … } #define nodes_weight(nodemask) … static inline int __nodes_weight(const nodemask_t *srcp, unsigned int nbits) { … } #define nodes_shift_right(dst, src, n) … static inline void __nodes_shift_right(nodemask_t *dstp, const nodemask_t *srcp, int n, int nbits) { … } #define nodes_shift_left(dst, src, n) … static inline void __nodes_shift_left(nodemask_t *dstp, const nodemask_t *srcp, int n, int nbits) { … } /* FIXME: better would be to fix all architectures to never return > MAX_NUMNODES, then the silly min_ts could be dropped. */ #define first_node(src) … static inline unsigned int __first_node(const nodemask_t *srcp) { … } #define next_node(n, src) … static inline unsigned int __next_node(int n, const nodemask_t *srcp) { … } /* * Find the next present node in src, starting after node n, wrapping around to * the first node in src if needed. Returns MAX_NUMNODES if src is empty. */ #define next_node_in(n, src) … static inline unsigned int __next_node_in(int node, const nodemask_t *srcp) { … } static inline void init_nodemask_of_node(nodemask_t *mask, int node) { … } #define nodemask_of_node(node) … #define first_unset_node(mask) … static inline unsigned int __first_unset_node(const nodemask_t *maskp) { … } #define NODE_MASK_LAST_WORD … #if MAX_NUMNODES <= BITS_PER_LONG #define NODE_MASK_ALL … #else #define NODE_MASK_ALL … #endif #define NODE_MASK_NONE … #define nodes_addr(src) … #define nodemask_parse_user(ubuf, ulen, dst) … static inline int __nodemask_parse_user(const char __user *buf, int len, nodemask_t *dstp, int nbits) { … } #define nodelist_parse(buf, dst) … static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits) { … } #define node_remap(oldbit, old, new) … static inline int __node_remap(int oldbit, const nodemask_t *oldp, const nodemask_t *newp, int nbits) { … } #define nodes_remap(dst, src, old, new) … static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp, const nodemask_t *oldp, const nodemask_t *newp, int nbits) { … } #define nodes_onto(dst, orig, relmap) … static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp, const nodemask_t *relmapp, int nbits) { … } #define nodes_fold(dst, orig, sz) … static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp, int sz, int nbits) { … } #if MAX_NUMNODES > 1 #define for_each_node_mask(node, mask) … #else /* MAX_NUMNODES == 1 */ #define for_each_node_mask … #endif /* MAX_NUMNODES */ /* * Bitmasks that are kept for all the nodes. */ enum node_states { … }; /* * The following particular system nodemasks and operations * on them manage all possible and online nodes. */ extern nodemask_t node_states[NR_NODE_STATES]; #if MAX_NUMNODES > 1 static inline int node_state(int node, enum node_states state) { … } static inline void node_set_state(int node, enum node_states state) { … } static inline void node_clear_state(int node, enum node_states state) { … } static inline int num_node_state(enum node_states state) { … } #define for_each_node_state(__node, __state) … #define first_online_node … #define first_memory_node … static inline unsigned int next_online_node(int nid) { … } static inline unsigned int next_memory_node(int nid) { … } extern unsigned int nr_node_ids; extern unsigned int nr_online_nodes; static inline void node_set_online(int nid) { … } static inline void node_set_offline(int nid) { … } #else static inline int node_state(int node, enum node_states state) { return node == 0; } static inline void node_set_state(int node, enum node_states state) { } static inline void node_clear_state(int node, enum node_states state) { } static inline int num_node_state(enum node_states state) { return 1; } #define for_each_node_state … #define first_online_node … #define first_memory_node … #define next_online_node … #define next_memory_node … #define nr_node_ids … #define nr_online_nodes … #define node_set_online … #define node_set_offline … #endif static inline int node_random(const nodemask_t *maskp) { … } #define node_online_map … #define node_possible_map … #define num_online_nodes() … #define num_possible_nodes() … #define node_online(node) … #define node_possible(node) … #define for_each_node(node) … #define for_each_online_node(node) … /* * For nodemask scratch area. * NODEMASK_ALLOC(type, name) allocates an object with a specified type and * name. */ #if NODES_SHIFT > 8 /* nodemask_t > 32 bytes */ #define NODEMASK_ALLOC(type, name, gfp_flags) … #define NODEMASK_FREE(m) … #else #define NODEMASK_ALLOC … #define NODEMASK_FREE … #endif /* Example structure for using NODEMASK_ALLOC, used in mempolicy. */ struct nodemask_scratch { … }; #define NODEMASK_SCRATCH(x) … #define NODEMASK_SCRATCH_FREE(x) … #endif /* __LINUX_NODEMASK_H */
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