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1da177e4 LT |
1 | #ifndef __LINUX_PERCPU_H |
2 | #define __LINUX_PERCPU_H | |
7ff6f082 | 3 | |
309381fe | 4 | #include <linux/mmdebug.h> |
0a3021f4 | 5 | #include <linux/preempt.h> |
1da177e4 | 6 | #include <linux/smp.h> |
7ff6f082 | 7 | #include <linux/cpumask.h> |
6a242909 | 8 | #include <linux/pfn.h> |
de380b55 | 9 | #include <linux/init.h> |
7ff6f082 | 10 | |
1da177e4 LT |
11 | #include <asm/percpu.h> |
12 | ||
6a242909 | 13 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
b00742d3 | 14 | #ifdef CONFIG_MODULES |
6a242909 | 15 | #define PERCPU_MODULE_RESERVE (8 << 10) |
b00742d3 | 16 | #else |
6a242909 | 17 | #define PERCPU_MODULE_RESERVE 0 |
1da177e4 LT |
18 | #endif |
19 | ||
6a242909 | 20 | #ifndef PERCPU_ENOUGH_ROOM |
b00742d3 | 21 | #define PERCPU_ENOUGH_ROOM \ |
6a242909 TH |
22 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
23 | PERCPU_MODULE_RESERVE) | |
24 | #endif | |
b00742d3 | 25 | |
8d408b4b | 26 | /* minimum unit size, also is the maximum supported allocation size */ |
6abad5ac | 27 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
8d408b4b | 28 | |
099a19d9 TH |
29 | /* |
30 | * Percpu allocator can serve percpu allocations before slab is | |
31 | * initialized which allows slab to depend on the percpu allocator. | |
32 | * The following two parameters decide how much resource to | |
33 | * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or | |
34 | * larger than PERCPU_DYNAMIC_EARLY_SIZE. | |
35 | */ | |
36 | #define PERCPU_DYNAMIC_EARLY_SLOTS 128 | |
37 | #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) | |
38 | ||
8d408b4b TH |
39 | /* |
40 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
6b19b0c2 TH |
41 | * back on the first chunk for dynamic percpu allocation if arch is |
42 | * manually allocating and mapping it for faster access (as a part of | |
43 | * large page mapping for example). | |
8d408b4b | 44 | * |
6b19b0c2 TH |
45 | * The following values give between one and two pages of free space |
46 | * after typical minimal boot (2-way SMP, single disk and NIC) with | |
47 | * both defconfig and a distro config on x86_64 and 32. More | |
48 | * intelligent way to determine this would be nice. | |
8d408b4b | 49 | */ |
6b19b0c2 TH |
50 | #if BITS_PER_LONG > 32 |
51 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) | |
52 | #else | |
53 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) | |
54 | #endif | |
8d408b4b | 55 | |
fbf59bc9 | 56 | extern void *pcpu_base_addr; |
fb435d52 | 57 | extern const unsigned long *pcpu_unit_offsets; |
1da177e4 | 58 | |
fd1e8a1f TH |
59 | struct pcpu_group_info { |
60 | int nr_units; /* aligned # of units */ | |
61 | unsigned long base_offset; /* base address offset */ | |
62 | unsigned int *cpu_map; /* unit->cpu map, empty | |
63 | * entries contain NR_CPUS */ | |
64 | }; | |
65 | ||
66 | struct pcpu_alloc_info { | |
67 | size_t static_size; | |
68 | size_t reserved_size; | |
69 | size_t dyn_size; | |
70 | size_t unit_size; | |
71 | size_t atom_size; | |
72 | size_t alloc_size; | |
73 | size_t __ai_size; /* internal, don't use */ | |
74 | int nr_groups; /* 0 if grouping unnecessary */ | |
75 | struct pcpu_group_info groups[]; | |
76 | }; | |
77 | ||
f58dc01b TH |
78 | enum pcpu_fc { |
79 | PCPU_FC_AUTO, | |
80 | PCPU_FC_EMBED, | |
81 | PCPU_FC_PAGE, | |
f58dc01b TH |
82 | |
83 | PCPU_FC_NR, | |
84 | }; | |
17f3609c | 85 | extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
f58dc01b TH |
86 | |
87 | extern enum pcpu_fc pcpu_chosen_fc; | |
88 | ||
3cbc8565 TH |
89 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
90 | size_t align); | |
d4b95f80 TH |
91 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
92 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
a530b795 | 93 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
fbf59bc9 | 94 | |
fd1e8a1f TH |
95 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
96 | int nr_units); | |
97 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); | |
98 | ||
fb435d52 TH |
99 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
100 | void *base_addr); | |
8d408b4b | 101 | |
08fc4580 | 102 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
4ba6ce25 | 103 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
c8826dd5 TH |
104 | size_t atom_size, |
105 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, | |
106 | pcpu_fc_alloc_fn_t alloc_fn, | |
107 | pcpu_fc_free_fn_t free_fn); | |
08fc4580 | 108 | #endif |
66c3a757 | 109 | |
08fc4580 | 110 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
fb435d52 | 111 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
d4b95f80 TH |
112 | pcpu_fc_alloc_fn_t alloc_fn, |
113 | pcpu_fc_free_fn_t free_fn, | |
114 | pcpu_fc_populate_pte_fn_t populate_pte_fn); | |
08fc4580 | 115 | #endif |
d4b95f80 | 116 | |
e0fdb0e0 | 117 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
10fad5e4 | 118 | extern bool is_kernel_percpu_address(unsigned long addr); |
1da177e4 | 119 | |
bbddff05 | 120 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
e74e3962 TH |
121 | extern void __init setup_per_cpu_areas(void); |
122 | #endif | |
099a19d9 | 123 | extern void __init percpu_init_late(void); |
e74e3962 | 124 | |
de380b55 TH |
125 | extern void __percpu *__alloc_percpu(size_t size, size_t align); |
126 | extern void free_percpu(void __percpu *__pdata); | |
127 | extern phys_addr_t per_cpu_ptr_to_phys(void *addr); | |
128 | ||
64ef291f | 129 | #define alloc_percpu(type) \ |
e0fdb0e0 | 130 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) |
1da177e4 LT |
131 | |
132 | #endif /* __LINUX_PERCPU_H */ |