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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> |
04b74b27 | 8 | #include <linux/printk.h> |
6a242909 | 9 | #include <linux/pfn.h> |
de380b55 | 10 | #include <linux/init.h> |
7ff6f082 | 11 | |
1da177e4 LT |
12 | #include <asm/percpu.h> |
13 | ||
6a242909 | 14 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
b00742d3 | 15 | #ifdef CONFIG_MODULES |
6a242909 | 16 | #define PERCPU_MODULE_RESERVE (8 << 10) |
b00742d3 | 17 | #else |
6a242909 | 18 | #define PERCPU_MODULE_RESERVE 0 |
1da177e4 LT |
19 | #endif |
20 | ||
6a242909 | 21 | #ifndef PERCPU_ENOUGH_ROOM |
b00742d3 | 22 | #define PERCPU_ENOUGH_ROOM \ |
6a242909 TH |
23 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
24 | PERCPU_MODULE_RESERVE) | |
25 | #endif | |
b00742d3 | 26 | |
8d408b4b | 27 | /* minimum unit size, also is the maximum supported allocation size */ |
6abad5ac | 28 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
8d408b4b | 29 | |
099a19d9 TH |
30 | /* |
31 | * Percpu allocator can serve percpu allocations before slab is | |
32 | * initialized which allows slab to depend on the percpu allocator. | |
33 | * The following two parameters decide how much resource to | |
34 | * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or | |
35 | * larger than PERCPU_DYNAMIC_EARLY_SIZE. | |
36 | */ | |
37 | #define PERCPU_DYNAMIC_EARLY_SLOTS 128 | |
38 | #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) | |
39 | ||
8d408b4b TH |
40 | /* |
41 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
6b19b0c2 TH |
42 | * back on the first chunk for dynamic percpu allocation if arch is |
43 | * manually allocating and mapping it for faster access (as a part of | |
44 | * large page mapping for example). | |
8d408b4b | 45 | * |
6b19b0c2 TH |
46 | * The following values give between one and two pages of free space |
47 | * after typical minimal boot (2-way SMP, single disk and NIC) with | |
48 | * both defconfig and a distro config on x86_64 and 32. More | |
49 | * intelligent way to determine this would be nice. | |
8d408b4b | 50 | */ |
6b19b0c2 | 51 | #if BITS_PER_LONG > 32 |
1a4d7607 | 52 | #define PERCPU_DYNAMIC_RESERVE (28 << 10) |
6b19b0c2 | 53 | #else |
1a4d7607 | 54 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) |
6b19b0c2 | 55 | #endif |
8d408b4b | 56 | |
fbf59bc9 | 57 | extern void *pcpu_base_addr; |
fb435d52 | 58 | extern const unsigned long *pcpu_unit_offsets; |
1da177e4 | 59 | |
fd1e8a1f TH |
60 | struct pcpu_group_info { |
61 | int nr_units; /* aligned # of units */ | |
62 | unsigned long base_offset; /* base address offset */ | |
63 | unsigned int *cpu_map; /* unit->cpu map, empty | |
64 | * entries contain NR_CPUS */ | |
65 | }; | |
66 | ||
67 | struct 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; /* internal, don't use */ | |
75 | int nr_groups; /* 0 if grouping unnecessary */ | |
76 | struct pcpu_group_info groups[]; | |
77 | }; | |
78 | ||
f58dc01b TH |
79 | enum pcpu_fc { |
80 | PCPU_FC_AUTO, | |
81 | PCPU_FC_EMBED, | |
82 | PCPU_FC_PAGE, | |
f58dc01b TH |
83 | |
84 | PCPU_FC_NR, | |
85 | }; | |
17f3609c | 86 | extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
f58dc01b TH |
87 | |
88 | extern enum pcpu_fc pcpu_chosen_fc; | |
89 | ||
3cbc8565 TH |
90 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
91 | size_t align); | |
d4b95f80 TH |
92 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
93 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
a530b795 | 94 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
fbf59bc9 | 95 | |
fd1e8a1f TH |
96 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
97 | int nr_units); | |
98 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); | |
99 | ||
fb435d52 TH |
100 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
101 | void *base_addr); | |
8d408b4b | 102 | |
08fc4580 | 103 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
4ba6ce25 | 104 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
c8826dd5 TH |
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); | |
08fc4580 | 109 | #endif |
66c3a757 | 110 | |
08fc4580 | 111 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
fb435d52 | 112 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
d4b95f80 TH |
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); | |
08fc4580 | 116 | #endif |
d4b95f80 | 117 | |
e0fdb0e0 | 118 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
10fad5e4 | 119 | extern bool is_kernel_percpu_address(unsigned long addr); |
1da177e4 | 120 | |
bbddff05 | 121 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
e74e3962 TH |
122 | extern void __init setup_per_cpu_areas(void); |
123 | #endif | |
099a19d9 | 124 | extern void __init percpu_init_late(void); |
e74e3962 | 125 | |
5835d96e | 126 | extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp); |
de380b55 TH |
127 | extern void __percpu *__alloc_percpu(size_t size, size_t align); |
128 | extern void free_percpu(void __percpu *__pdata); | |
129 | extern phys_addr_t per_cpu_ptr_to_phys(void *addr); | |
130 | ||
5835d96e TH |
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)) | |
1da177e4 | 137 | |
afdc34a3 SRRH |
138 | /* To avoid include hell, as printk can not declare this, we declare it here */ |
139 | DECLARE_PER_CPU(printk_func_t, printk_func); | |
140 | ||
1da177e4 | 141 | #endif /* __LINUX_PERCPU_H */ |