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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166/* SPDX-License-Identifier: GPL-2.0 */#ifndef __LINUX_PERCPU_H#define __LINUX_PERCPU_H
#include <linux/alloc_tag.h>#include <linux/cleanup.h>#include <linux/compiler_types.h>#include <linux/init.h>#include <linux/mmdebug.h>#include <linux/pfn.h>#include <linux/preempt.h>#include <linux/sched.h>#include <linux/smp.h>
#include <asm/percpu.h>
/* enough to cover all DEFINE_PER_CPUs in modules */#ifdef CONFIG_MODULES#define PERCPU_MODULE_RESERVE (8 << 10)#else#define PERCPU_MODULE_RESERVE 0#endif
/* minimum unit size, also is the maximum supported allocation size */#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
/* minimum allocation size and shift in bytes */#define PCPU_MIN_ALLOC_SHIFT 2#define PCPU_MIN_ALLOC_SIZE (1 << PCPU_MIN_ALLOC_SHIFT)
/* * The PCPU_BITMAP_BLOCK_SIZE must be the same size as PAGE_SIZE as the * updating of hints is used to manage the nr_empty_pop_pages in both * the chunk and globally. */#define PCPU_BITMAP_BLOCK_SIZE PAGE_SIZE#define PCPU_BITMAP_BLOCK_BITS (PCPU_BITMAP_BLOCK_SIZE >> \ PCPU_MIN_ALLOC_SHIFT)
#ifdef CONFIG_KMALLOC_PARTITION_CACHES# if defined(CONFIG_LOCKDEP) && !defined(CONFIG_PAGE_SIZE_4KB)# define PERCPU_DYNAMIC_SIZE_SHIFT 13# else# define PERCPU_DYNAMIC_SIZE_SHIFT 12#endif /* LOCKDEP and PAGE_SIZE > 4KiB */#else#define PERCPU_DYNAMIC_SIZE_SHIFT 10#endif
/* * Percpu allocator can serve percpu allocations before slab is * initialized which allows slab to depend on the percpu allocator. * The following parameter decide how much resource to preallocate * for this. Keep PERCPU_DYNAMIC_RESERVE equal to or larger than * PERCPU_DYNAMIC_EARLY_SIZE. */#define PERCPU_DYNAMIC_EARLY_SIZE (20 << PERCPU_DYNAMIC_SIZE_SHIFT)
/* * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy * back on the first chunk for dynamic percpu allocation if arch is * manually allocating and mapping it for faster access (as a part of * large page mapping for example). * * The following values give between one and two pages of free space * after typical minimal boot (2-way SMP, single disk and NIC) with * both defconfig and a distro config on x86_64 and 32. More * intelligent way to determine this would be nice. */#if BITS_PER_LONG > 32#define PERCPU_DYNAMIC_RESERVE (28 << PERCPU_DYNAMIC_SIZE_SHIFT)#else#define PERCPU_DYNAMIC_RESERVE (20 << PERCPU_DYNAMIC_SIZE_SHIFT)#endif
extern void *pcpu_base_addr;extern const unsigned long *pcpu_unit_offsets;
struct pcpu_group_info { int nr_units; /* aligned # of units */ unsigned long base_offset; /* base address offset */ unsigned int *cpu_map; /* unit->cpu map, empty * entries contain NR_CPUS */};
struct pcpu_alloc_info { size_t static_size; size_t reserved_size; size_t dyn_size; size_t unit_size; size_t atom_size; size_t alloc_size; size_t __ai_size; /* internal, don't use */ int nr_groups; /* 0 if grouping unnecessary */ struct pcpu_group_info groups[];};
enum pcpu_fc { PCPU_FC_AUTO, PCPU_FC_EMBED, PCPU_FC_PAGE,
PCPU_FC_NR,};extern const char * const pcpu_fc_names[PCPU_FC_NR];
extern enum pcpu_fc pcpu_chosen_fc;
typedef int (pcpu_fc_cpu_to_node_fn_t)(int cpu);typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, int nr_units);extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, void *base_addr);
extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, size_t atom_size, pcpu_fc_cpu_distance_fn_t cpu_distance_fn, pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn);
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNKvoid __init pcpu_populate_pte(unsigned long addr);extern int __init pcpu_page_first_chunk(size_t reserved_size, pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn);#endif
extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr);extern bool is_kernel_percpu_address(unsigned long addr);
#if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)extern void __init setup_per_cpu_areas(void);#endif
extern void __percpu *pcpu_alloc_noprof(size_t size, size_t align, bool reserved, gfp_t gfp) __alloc_size(1);
#define __alloc_percpu_gfp(_size, _align, _gfp) \ alloc_hooks(pcpu_alloc_noprof(_size, _align, false, _gfp))#define __alloc_percpu(_size, _align) \ alloc_hooks(pcpu_alloc_noprof(_size, _align, false, GFP_KERNEL))#define __alloc_reserved_percpu(_size, _align) \ alloc_hooks(pcpu_alloc_noprof(_size, _align, true, GFP_KERNEL))
#define alloc_percpu_gfp(type, gfp) \ (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type), \ __alignof__(type), gfp)#define alloc_percpu(type) \ (typeof(type) __percpu *)__alloc_percpu(sizeof(type), \ __alignof__(type))#define alloc_percpu_noprof(type) \ ((typeof(type) __percpu *)pcpu_alloc_noprof(sizeof(type), \ __alignof__(type), false, GFP_KERNEL))
extern void free_percpu(void __percpu *__pdata);
DEFINE_FREE(free_percpu, void __percpu *, free_percpu(_T))
extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
extern unsigned long pcpu_nr_pages(void);
#endif /* __LINUX_PERCPU_H */