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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_PERCPU_H |
3 | #define __LINUX_PERCPU_H | |
7ff6f082 | 4 | |
309381fe | 5 | #include <linux/mmdebug.h> |
0a3021f4 | 6 | #include <linux/preempt.h> |
1da177e4 | 7 | #include <linux/smp.h> |
7ff6f082 | 8 | #include <linux/cpumask.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 | ||
8d408b4b | 21 | /* minimum unit size, also is the maximum supported allocation size */ |
6abad5ac | 22 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
8d408b4b | 23 | |
d2f3c384 DZF |
24 | /* minimum allocation size and shift in bytes */ |
25 | #define PCPU_MIN_ALLOC_SHIFT 2 | |
26 | #define PCPU_MIN_ALLOC_SIZE (1 << PCPU_MIN_ALLOC_SHIFT) | |
27 | ||
ca460b3c | 28 | /* |
b239f7da DZ |
29 | * The PCPU_BITMAP_BLOCK_SIZE must be the same size as PAGE_SIZE as the |
30 | * updating of hints is used to manage the nr_empty_pop_pages in both | |
31 | * the chunk and globally. | |
ca460b3c DZF |
32 | */ |
33 | #define PCPU_BITMAP_BLOCK_SIZE PAGE_SIZE | |
34 | #define PCPU_BITMAP_BLOCK_BITS (PCPU_BITMAP_BLOCK_SIZE >> \ | |
35 | PCPU_MIN_ALLOC_SHIFT) | |
36 | ||
099a19d9 TH |
37 | /* |
38 | * Percpu allocator can serve percpu allocations before slab is | |
39 | * initialized which allows slab to depend on the percpu allocator. | |
40 | * The following two parameters decide how much resource to | |
41 | * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or | |
42 | * larger than PERCPU_DYNAMIC_EARLY_SIZE. | |
43 | */ | |
44 | #define PERCPU_DYNAMIC_EARLY_SLOTS 128 | |
45 | #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) | |
46 | ||
8d408b4b TH |
47 | /* |
48 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
6b19b0c2 TH |
49 | * back on the first chunk for dynamic percpu allocation if arch is |
50 | * manually allocating and mapping it for faster access (as a part of | |
51 | * large page mapping for example). | |
8d408b4b | 52 | * |
6b19b0c2 TH |
53 | * The following values give between one and two pages of free space |
54 | * after typical minimal boot (2-way SMP, single disk and NIC) with | |
55 | * both defconfig and a distro config on x86_64 and 32. More | |
56 | * intelligent way to determine this would be nice. | |
8d408b4b | 57 | */ |
6b19b0c2 | 58 | #if BITS_PER_LONG > 32 |
1a4d7607 | 59 | #define PERCPU_DYNAMIC_RESERVE (28 << 10) |
6b19b0c2 | 60 | #else |
1a4d7607 | 61 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) |
6b19b0c2 | 62 | #endif |
8d408b4b | 63 | |
fbf59bc9 | 64 | extern void *pcpu_base_addr; |
fb435d52 | 65 | extern const unsigned long *pcpu_unit_offsets; |
1da177e4 | 66 | |
fd1e8a1f TH |
67 | struct pcpu_group_info { |
68 | int nr_units; /* aligned # of units */ | |
69 | unsigned long base_offset; /* base address offset */ | |
70 | unsigned int *cpu_map; /* unit->cpu map, empty | |
71 | * entries contain NR_CPUS */ | |
72 | }; | |
73 | ||
74 | struct pcpu_alloc_info { | |
75 | size_t static_size; | |
76 | size_t reserved_size; | |
77 | size_t dyn_size; | |
78 | size_t unit_size; | |
79 | size_t atom_size; | |
80 | size_t alloc_size; | |
81 | size_t __ai_size; /* internal, don't use */ | |
82 | int nr_groups; /* 0 if grouping unnecessary */ | |
83 | struct pcpu_group_info groups[]; | |
84 | }; | |
85 | ||
f58dc01b TH |
86 | enum pcpu_fc { |
87 | PCPU_FC_AUTO, | |
88 | PCPU_FC_EMBED, | |
89 | PCPU_FC_PAGE, | |
f58dc01b TH |
90 | |
91 | PCPU_FC_NR, | |
92 | }; | |
17f3609c | 93 | extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
f58dc01b TH |
94 | |
95 | extern enum pcpu_fc pcpu_chosen_fc; | |
96 | ||
1ca3fb3a | 97 | typedef int (pcpu_fc_cpu_to_node_fn_t)(int cpu); |
a530b795 | 98 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
fbf59bc9 | 99 | |
fd1e8a1f TH |
100 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
101 | int nr_units); | |
102 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); | |
103 | ||
163fa234 | 104 | extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
fb435d52 | 105 | void *base_addr); |
8d408b4b | 106 | |
08fc4580 | 107 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
4ba6ce25 | 108 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
c8826dd5 TH |
109 | size_t atom_size, |
110 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, | |
23f91716 | 111 | pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn); |
08fc4580 | 112 | #endif |
66c3a757 | 113 | |
08fc4580 | 114 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
20c03576 | 115 | void __init pcpu_populate_pte(unsigned long addr); |
fb435d52 | 116 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
20c03576 | 117 | pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn); |
08fc4580 | 118 | #endif |
d4b95f80 | 119 | |
17197dd4 | 120 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align) __alloc_size(1); |
383776fa | 121 | extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr); |
10fad5e4 | 122 | extern bool is_kernel_percpu_address(unsigned long addr); |
1da177e4 | 123 | |
bbddff05 | 124 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
e74e3962 TH |
125 | extern void __init setup_per_cpu_areas(void); |
126 | #endif | |
127 | ||
17197dd4 KC |
128 | extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp) __alloc_size(1); |
129 | extern void __percpu *__alloc_percpu(size_t size, size_t align) __alloc_size(1); | |
de380b55 TH |
130 | extern void free_percpu(void __percpu *__pdata); |
131 | extern phys_addr_t per_cpu_ptr_to_phys(void *addr); | |
132 | ||
5835d96e TH |
133 | #define alloc_percpu_gfp(type, gfp) \ |
134 | (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type), \ | |
135 | __alignof__(type), gfp) | |
136 | #define alloc_percpu(type) \ | |
137 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), \ | |
138 | __alignof__(type)) | |
1da177e4 | 139 | |
7e8a6304 DZF |
140 | extern unsigned long pcpu_nr_pages(void); |
141 | ||
1da177e4 | 142 | #endif /* __LINUX_PERCPU_H */ |