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lib/cpumask.c
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// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/slab.h> |
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#include <linux/kernel.h> #include <linux/bitops.h> #include <linux/cpumask.h> |
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#include <linux/export.h> |
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#include <linux/bootmem.h> |
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/** |
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* 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. */ 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); } EXPORT_SYMBOL(cpumask_next); /** |
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* cpumask_next_and - get the next cpu in *src1p & *src2p * @n: the cpu prior to the place to search (ie. return will be > @n) * @src1p: the first cpumask pointer * @src2p: the second cpumask pointer * * Returns >= nr_cpu_ids if no further cpus set in both. */ int cpumask_next_and(int n, const struct cpumask *src1p, const struct cpumask *src2p) { |
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while ((n = cpumask_next(n, src1p)) < nr_cpu_ids) if (cpumask_test_cpu(n, src2p)) break; return n; |
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} EXPORT_SYMBOL(cpumask_next_and); /** * cpumask_any_but - return a "random" in a cpumask, but not this one. * @mask: the cpumask to search * @cpu: the cpu to ignore. * * Often used to find any cpu but smp_processor_id() in a mask. * Returns >= nr_cpu_ids if no cpus set. */ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) { unsigned int i; |
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cpumask_check(cpu); |
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for_each_cpu(i, mask) if (i != cpu) break; return i; } |
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EXPORT_SYMBOL(cpumask_any_but); |
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/** * cpumask_next_wrap - helper to implement for_each_cpu_wrap * @n: the cpu prior to the place to search * @mask: the cpumask pointer * @start: the start point of the iteration * @wrap: assume @n crossing @start terminates the iteration * * Returns >= nr_cpu_ids on completion * * Note: the @wrap argument is required for the start condition when * we cannot assume @start is set in @mask. */ int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap) { int next; again: next = cpumask_next(n, mask); if (wrap && n < start && next >= start) { return nr_cpumask_bits; } else if (next >= nr_cpumask_bits) { wrap = true; n = -1; goto again; } return next; } EXPORT_SYMBOL(cpumask_next_wrap); |
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/* These are not inline because of header tangles. */ #ifdef CONFIG_CPUMASK_OFFSTACK |
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/** * alloc_cpumask_var_node - allocate a struct cpumask on a given node * @mask: pointer to cpumask_var_t where the cpumask is returned * @flags: GFP_ flags * * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is * a nop returning a constant 1 (in <linux/cpumask.h>) * Returns TRUE if memory allocation succeeded, FALSE otherwise. * * In addition, mask will be NULL if this fails. Note that gcc is * usually smart enough to know that mask can never be NULL if * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case * too. */ |
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bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) |
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{ |
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*mask = kmalloc_node(cpumask_size(), flags, node); |
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS if (!*mask) { printk(KERN_ERR "=> alloc_cpumask_var: failed! "); dump_stack(); } #endif |
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return *mask != NULL; } |
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EXPORT_SYMBOL(alloc_cpumask_var_node); |
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bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) { return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node); } EXPORT_SYMBOL(zalloc_cpumask_var_node); |
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/** * alloc_cpumask_var - allocate a struct cpumask * @mask: pointer to cpumask_var_t where the cpumask is returned * @flags: GFP_ flags * * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is * a nop returning a constant 1 (in <linux/cpumask.h>). * * See alloc_cpumask_var_node. */ |
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bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { |
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return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE); |
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} |
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EXPORT_SYMBOL(alloc_cpumask_var); |
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bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { return alloc_cpumask_var(mask, flags | __GFP_ZERO); } EXPORT_SYMBOL(zalloc_cpumask_var); |
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/** * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena. * @mask: pointer to cpumask_var_t where the cpumask is returned * * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is |
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* a nop (in <linux/cpumask.h>). |
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* Either returns an allocated (zero-filled) cpumask, or causes the * system to panic. */ |
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void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) { |
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*mask = memblock_virt_alloc(cpumask_size(), 0); |
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} |
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/** * free_cpumask_var - frees memory allocated for a struct cpumask. * @mask: cpumask to free * * This is safe on a NULL mask. */ |
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void free_cpumask_var(cpumask_var_t mask) { kfree(mask); } EXPORT_SYMBOL(free_cpumask_var); |
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/** * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var * @mask: cpumask to free */ |
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void __init free_bootmem_cpumask_var(cpumask_var_t mask) |
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{ |
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memblock_free_early(__pa(mask), cpumask_size()); |
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} |
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#endif |
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/** |
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* cpumask_local_spread - select the i'th cpu with local numa cpu's first |
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* @i: index number |
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* @node: local numa_node |
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* |
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* This function selects an online CPU according to a numa aware policy; * local cpus are returned first, followed by non-local ones, then it * wraps around. |
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* |
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* It's not very efficient, but useful for setup. |
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*/ |
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unsigned int cpumask_local_spread(unsigned int i, int node) |
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{ |
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int cpu; |
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/* Wrap: we always want a cpu. */ |
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i %= num_online_cpus(); |
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if (node == -1) { for_each_cpu(cpu, cpu_online_mask) if (i-- == 0) return cpu; |
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} else { |
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/* NUMA first. */ for_each_cpu_and(cpu, cpumask_of_node(node), cpu_online_mask) if (i-- == 0) return cpu; for_each_cpu(cpu, cpu_online_mask) { /* Skip NUMA nodes, done above. */ if (cpumask_test_cpu(cpu, cpumask_of_node(node))) continue; if (i-- == 0) return cpu; |
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} } |
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BUG(); |
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} |
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EXPORT_SYMBOL(cpumask_local_spread); |