1
2 #ifndef __LINUX_PERCPU_H
3 #define __LINUX_PERCPU_H
4
5 #include <linux/mmdebug.h>
6 #include <linux/preempt.h>
7 #include <linux/smp.h>
8 #include <linux/cpumask.h>
9 #include <linux/printk.h>
10 #include <linux/pfn.h>
11 #include <linux/init.h>
12
13 #include <asm/percpu.h>
14
15
16 #ifdef CONFIG_MODULES
17 #define PERCPU_MODULE_RESERVE (8 << 10)
18 #else
19 #define PERCPU_MODULE_RESERVE 0
20 #endif
21
22
23 #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
24
25
26 #define PCPU_MIN_ALLOC_SHIFT 2
27 #define PCPU_MIN_ALLOC_SIZE (1 << PCPU_MIN_ALLOC_SHIFT)
28
29
30
31
32
33
34 #define PCPU_BITMAP_BLOCK_SIZE PAGE_SIZE
35 #define PCPU_BITMAP_BLOCK_BITS (PCPU_BITMAP_BLOCK_SIZE >> \
36 PCPU_MIN_ALLOC_SHIFT)
37
38
39
40
41
42
43
44
45 #define PERCPU_DYNAMIC_EARLY_SLOTS 128
46 #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10)
47
48
49
50
51
52
53
54
55
56
57
58
59 #if BITS_PER_LONG > 32
60 #define PERCPU_DYNAMIC_RESERVE (28 << 10)
61 #else
62 #define PERCPU_DYNAMIC_RESERVE (20 << 10)
63 #endif
64
65 extern void *pcpu_base_addr;
66 extern const unsigned long *pcpu_unit_offsets;
67
68 struct pcpu_group_info {
69 int nr_units;
70 unsigned long base_offset;
71 unsigned int *cpu_map;
72
73 };
74
75 struct pcpu_alloc_info {
76 size_t static_size;
77 size_t reserved_size;
78 size_t dyn_size;
79 size_t unit_size;
80 size_t atom_size;
81 size_t alloc_size;
82 size_t __ai_size;
83 int nr_groups;
84 struct pcpu_group_info groups[];
85 };
86
87 enum pcpu_fc {
88 PCPU_FC_AUTO,
89 PCPU_FC_EMBED,
90 PCPU_FC_PAGE,
91
92 PCPU_FC_NR,
93 };
94 extern const char * const pcpu_fc_names[PCPU_FC_NR];
95
96 extern enum pcpu_fc pcpu_chosen_fc;
97
98 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
99 size_t align);
100 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
101 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
102 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
103
104 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
105 int nr_units);
106 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
107
108 extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
109 void *base_addr);
110
111 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
112 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
113 size_t atom_size,
114 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
115 pcpu_fc_alloc_fn_t alloc_fn,
116 pcpu_fc_free_fn_t free_fn);
117 #endif
118
119 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
120 extern int __init pcpu_page_first_chunk(size_t reserved_size,
121 pcpu_fc_alloc_fn_t alloc_fn,
122 pcpu_fc_free_fn_t free_fn,
123 pcpu_fc_populate_pte_fn_t populate_pte_fn);
124 #endif
125
126 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
127 extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr);
128 extern bool is_kernel_percpu_address(unsigned long addr);
129
130 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
131 extern void __init setup_per_cpu_areas(void);
132 #endif
133
134 extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp);
135 extern void __percpu *__alloc_percpu(size_t size, size_t align);
136 extern void free_percpu(void __percpu *__pdata);
137 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
138
139 #define alloc_percpu_gfp(type, gfp) \
140 (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type), \
141 __alignof__(type), gfp)
142 #define alloc_percpu(type) \
143 (typeof(type) __percpu *)__alloc_percpu(sizeof(type), \
144 __alignof__(type))
145
146 extern unsigned long pcpu_nr_pages(void);
147
148 #endif