1#ifndef __LINUX_PERCPU_H
2#define __LINUX_PERCPU_H
3
4#include <linux/mmdebug.h>
5#include <linux/preempt.h>
6#include <linux/smp.h>
7#include <linux/cpumask.h>
8#include <linux/printk.h>
9#include <linux/pfn.h>
10#include <linux/init.h>
11
12#include <asm/percpu.h>
13
14
15#ifdef CONFIG_MODULES
16#define PERCPU_MODULE_RESERVE (8 << 10)
17#else
18#define PERCPU_MODULE_RESERVE 0
19#endif
20
21#ifndef PERCPU_ENOUGH_ROOM
22#define PERCPU_ENOUGH_ROOM \
23 (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
24 PERCPU_MODULE_RESERVE)
25#endif
26
27
28#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
29
30
31
32
33
34
35
36
37#define PERCPU_DYNAMIC_EARLY_SLOTS 128
38#define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10)
39
40
41
42
43
44
45
46
47
48
49
50
51#if BITS_PER_LONG > 32
52#define PERCPU_DYNAMIC_RESERVE (28 << 10)
53#else
54#define PERCPU_DYNAMIC_RESERVE (20 << 10)
55#endif
56
57extern void *pcpu_base_addr;
58extern const unsigned long *pcpu_unit_offsets;
59
60struct pcpu_group_info {
61 int nr_units;
62 unsigned long base_offset;
63 unsigned int *cpu_map;
64
65};
66
67struct pcpu_alloc_info {
68 size_t static_size;
69 size_t reserved_size;
70 size_t dyn_size;
71 size_t unit_size;
72 size_t atom_size;
73 size_t alloc_size;
74 size_t __ai_size;
75 int nr_groups;
76 struct pcpu_group_info groups[];
77};
78
79enum pcpu_fc {
80 PCPU_FC_AUTO,
81 PCPU_FC_EMBED,
82 PCPU_FC_PAGE,
83
84 PCPU_FC_NR,
85};
86extern const char * const pcpu_fc_names[PCPU_FC_NR];
87
88extern enum pcpu_fc pcpu_chosen_fc;
89
90typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
91 size_t align);
92typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
93typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
94typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
95
96extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
97 int nr_units);
98extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
99
100extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
101 void *base_addr);
102
103#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
104extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
105 size_t atom_size,
106 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
107 pcpu_fc_alloc_fn_t alloc_fn,
108 pcpu_fc_free_fn_t free_fn);
109#endif
110
111#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
112extern int __init pcpu_page_first_chunk(size_t reserved_size,
113 pcpu_fc_alloc_fn_t alloc_fn,
114 pcpu_fc_free_fn_t free_fn,
115 pcpu_fc_populate_pte_fn_t populate_pte_fn);
116#endif
117
118extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
119extern bool is_kernel_percpu_address(unsigned long addr);
120
121#if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
122extern void __init setup_per_cpu_areas(void);
123#endif
124extern void __init percpu_init_late(void);
125
126extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp);
127extern void __percpu *__alloc_percpu(size_t size, size_t align);
128extern void free_percpu(void __percpu *__pdata);
129extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
130
131#define alloc_percpu_gfp(type, gfp) \
132 (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type), \
133 __alignof__(type), gfp)
134#define alloc_percpu(type) \
135 (typeof(type) __percpu *)__alloc_percpu(sizeof(type), \
136 __alignof__(type))
137
138
139DECLARE_PER_CPU(printk_func_t, printk_func);
140
141#endif
142