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1da177e4 LT |
1 | #ifndef __LINUX_PERCPU_H |
2 | #define __LINUX_PERCPU_H | |
7ff6f082 | 3 | |
0a3021f4 | 4 | #include <linux/preempt.h> |
1da177e4 LT |
5 | #include <linux/slab.h> /* For kmalloc() */ |
6 | #include <linux/smp.h> | |
7ff6f082 | 7 | #include <linux/cpumask.h> |
6a242909 | 8 | #include <linux/pfn.h> |
7ff6f082 | 9 | |
1da177e4 LT |
10 | #include <asm/percpu.h> |
11 | ||
6a242909 | 12 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
b00742d3 | 13 | #ifdef CONFIG_MODULES |
6a242909 | 14 | #define PERCPU_MODULE_RESERVE (8 << 10) |
b00742d3 | 15 | #else |
6a242909 | 16 | #define PERCPU_MODULE_RESERVE 0 |
1da177e4 LT |
17 | #endif |
18 | ||
6a242909 | 19 | #ifndef PERCPU_ENOUGH_ROOM |
b00742d3 | 20 | #define PERCPU_ENOUGH_ROOM \ |
6a242909 TH |
21 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
22 | PERCPU_MODULE_RESERVE) | |
23 | #endif | |
b00742d3 | 24 | |
632bbfee JB |
25 | /* |
26 | * Must be an lvalue. Since @var must be a simple identifier, | |
27 | * we force a syntax error here if it isn't. | |
28 | */ | |
29 | #define get_cpu_var(var) (*({ \ | |
a666ecfb | 30 | extern int simple_identifier_##var(void); \ |
632bbfee JB |
31 | preempt_disable(); \ |
32 | &__get_cpu_var(var); })) | |
1da177e4 LT |
33 | #define put_cpu_var(var) preempt_enable() |
34 | ||
35 | #ifdef CONFIG_SMP | |
36 | ||
e74e3962 | 37 | #ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA |
1da177e4 | 38 | |
8d408b4b | 39 | /* minimum unit size, also is the maximum supported allocation size */ |
6a242909 | 40 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(64 << 10) |
8d408b4b TH |
41 | |
42 | /* | |
43 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
6b19b0c2 TH |
44 | * back on the first chunk for dynamic percpu allocation if arch is |
45 | * manually allocating and mapping it for faster access (as a part of | |
46 | * large page mapping for example). | |
8d408b4b | 47 | * |
6b19b0c2 TH |
48 | * The following values give between one and two pages of free space |
49 | * after typical minimal boot (2-way SMP, single disk and NIC) with | |
50 | * both defconfig and a distro config on x86_64 and 32. More | |
51 | * intelligent way to determine this would be nice. | |
8d408b4b | 52 | */ |
6b19b0c2 TH |
53 | #if BITS_PER_LONG > 32 |
54 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) | |
55 | #else | |
56 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) | |
57 | #endif | |
8d408b4b | 58 | |
fbf59bc9 | 59 | extern void *pcpu_base_addr; |
fb435d52 | 60 | extern const unsigned long *pcpu_unit_offsets; |
1da177e4 | 61 | |
fd1e8a1f TH |
62 | struct pcpu_group_info { |
63 | int nr_units; /* aligned # of units */ | |
64 | unsigned long base_offset; /* base address offset */ | |
65 | unsigned int *cpu_map; /* unit->cpu map, empty | |
66 | * entries contain NR_CPUS */ | |
67 | }; | |
68 | ||
69 | struct pcpu_alloc_info { | |
70 | size_t static_size; | |
71 | size_t reserved_size; | |
72 | size_t dyn_size; | |
73 | size_t unit_size; | |
74 | size_t atom_size; | |
75 | size_t alloc_size; | |
76 | size_t __ai_size; /* internal, don't use */ | |
77 | int nr_groups; /* 0 if grouping unnecessary */ | |
78 | struct pcpu_group_info groups[]; | |
79 | }; | |
80 | ||
f58dc01b TH |
81 | enum pcpu_fc { |
82 | PCPU_FC_AUTO, | |
83 | PCPU_FC_EMBED, | |
84 | PCPU_FC_PAGE, | |
f58dc01b TH |
85 | |
86 | PCPU_FC_NR, | |
87 | }; | |
88 | extern const char *pcpu_fc_names[PCPU_FC_NR]; | |
89 | ||
90 | extern enum pcpu_fc pcpu_chosen_fc; | |
91 | ||
3cbc8565 TH |
92 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
93 | size_t align); | |
d4b95f80 TH |
94 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
95 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
a530b795 | 96 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
fbf59bc9 | 97 | |
fd1e8a1f TH |
98 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
99 | int nr_units); | |
100 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); | |
101 | ||
102 | extern struct pcpu_alloc_info * __init pcpu_build_alloc_info( | |
103 | size_t reserved_size, ssize_t dyn_size, | |
104 | size_t atom_size, | |
033e48fb | 105 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn); |
033e48fb | 106 | |
fb435d52 TH |
107 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
108 | void *base_addr); | |
8d408b4b | 109 | |
08fc4580 | 110 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
c8826dd5 TH |
111 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size, |
112 | size_t atom_size, | |
113 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, | |
114 | pcpu_fc_alloc_fn_t alloc_fn, | |
115 | pcpu_fc_free_fn_t free_fn); | |
08fc4580 | 116 | #endif |
66c3a757 | 117 | |
08fc4580 | 118 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
fb435d52 | 119 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
d4b95f80 TH |
120 | pcpu_fc_alloc_fn_t alloc_fn, |
121 | pcpu_fc_free_fn_t free_fn, | |
122 | pcpu_fc_populate_pte_fn_t populate_pte_fn); | |
08fc4580 | 123 | #endif |
d4b95f80 | 124 | |
f2a8205c TH |
125 | /* |
126 | * Use this to get to a cpu's version of the per-cpu object | |
127 | * dynamically allocated. Non-atomic access to the current CPU's | |
128 | * version should probably be combined with get_cpu()/put_cpu(). | |
129 | */ | |
fbf59bc9 TH |
130 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
131 | ||
edcb4639 TH |
132 | extern void *__alloc_reserved_percpu(size_t size, size_t align); |
133 | ||
e74e3962 | 134 | #else /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 TH |
135 | |
136 | struct percpu_data { | |
137 | void *ptrs[1]; | |
138 | }; | |
139 | ||
2e1483c9 CM |
140 | /* pointer disguising messes up the kmemleak objects tracking */ |
141 | #ifndef CONFIG_DEBUG_KMEMLEAK | |
fbf59bc9 | 142 | #define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata) |
2e1483c9 CM |
143 | #else |
144 | #define __percpu_disguise(pdata) (struct percpu_data *)(pdata) | |
145 | #endif | |
fbf59bc9 | 146 | |
f2a8205c TH |
147 | #define per_cpu_ptr(ptr, cpu) \ |
148 | ({ \ | |
149 | struct percpu_data *__p = __percpu_disguise(ptr); \ | |
150 | (__typeof__(ptr))__p->ptrs[(cpu)]; \ | |
151 | }) | |
152 | ||
e74e3962 | 153 | #endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 | 154 | |
f2a8205c TH |
155 | extern void *__alloc_percpu(size_t size, size_t align); |
156 | extern void free_percpu(void *__pdata); | |
1da177e4 | 157 | |
e74e3962 TH |
158 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA |
159 | extern void __init setup_per_cpu_areas(void); | |
160 | #endif | |
161 | ||
1da177e4 LT |
162 | #else /* CONFIG_SMP */ |
163 | ||
b36128c8 | 164 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); }) |
7ff6f082 | 165 | |
f2a8205c | 166 | static inline void *__alloc_percpu(size_t size, size_t align) |
7ff6f082 | 167 | { |
f2a8205c TH |
168 | /* |
169 | * Can't easily make larger alignment work with kmalloc. WARN | |
170 | * on it. Larger alignment should only be used for module | |
171 | * percpu sections on SMP for which this path isn't used. | |
172 | */ | |
e3176036 | 173 | WARN_ON_ONCE(align > SMP_CACHE_BYTES); |
d2b02615 | 174 | return kzalloc(size, GFP_KERNEL); |
7ff6f082 MP |
175 | } |
176 | ||
f2a8205c | 177 | static inline void free_percpu(void *p) |
7ff6f082 | 178 | { |
f2a8205c | 179 | kfree(p); |
1da177e4 LT |
180 | } |
181 | ||
e74e3962 TH |
182 | static inline void __init setup_per_cpu_areas(void) { } |
183 | ||
a76761b6 TH |
184 | static inline void *pcpu_lpage_remapped(void *kaddr) |
185 | { | |
186 | return NULL; | |
187 | } | |
188 | ||
1da177e4 LT |
189 | #endif /* CONFIG_SMP */ |
190 | ||
313e458f RR |
191 | #define alloc_percpu(type) (type *)__alloc_percpu(sizeof(type), \ |
192 | __alignof__(type)) | |
1da177e4 | 193 | |
066123a5 TH |
194 | /* |
195 | * Optional methods for optimized non-lvalue per-cpu variable access. | |
196 | * | |
197 | * @var can be a percpu variable or a field of it and its size should | |
198 | * equal char, int or long. percpu_read() evaluates to a lvalue and | |
199 | * all others to void. | |
200 | * | |
201 | * These operations are guaranteed to be atomic w.r.t. preemption. | |
202 | * The generic versions use plain get/put_cpu_var(). Archs are | |
203 | * encouraged to implement single-instruction alternatives which don't | |
204 | * require preemption protection. | |
205 | */ | |
206 | #ifndef percpu_read | |
207 | # define percpu_read(var) \ | |
208 | ({ \ | |
209 | typeof(per_cpu_var(var)) __tmp_var__; \ | |
210 | __tmp_var__ = get_cpu_var(var); \ | |
211 | put_cpu_var(var); \ | |
212 | __tmp_var__; \ | |
213 | }) | |
214 | #endif | |
215 | ||
216 | #define __percpu_generic_to_op(var, val, op) \ | |
217 | do { \ | |
218 | get_cpu_var(var) op val; \ | |
219 | put_cpu_var(var); \ | |
220 | } while (0) | |
221 | ||
222 | #ifndef percpu_write | |
223 | # define percpu_write(var, val) __percpu_generic_to_op(var, (val), =) | |
224 | #endif | |
225 | ||
226 | #ifndef percpu_add | |
227 | # define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=) | |
228 | #endif | |
229 | ||
230 | #ifndef percpu_sub | |
231 | # define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=) | |
232 | #endif | |
233 | ||
234 | #ifndef percpu_and | |
235 | # define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=) | |
236 | #endif | |
237 | ||
238 | #ifndef percpu_or | |
239 | # define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=) | |
240 | #endif | |
241 | ||
242 | #ifndef percpu_xor | |
243 | # define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=) | |
244 | #endif | |
245 | ||
1da177e4 | 246 | #endif /* __LINUX_PERCPU_H */ |