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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; |
2f39e637 | 60 | extern const int *pcpu_unit_map; |
1da177e4 | 61 | |
f58dc01b TH |
62 | enum pcpu_fc { |
63 | PCPU_FC_AUTO, | |
64 | PCPU_FC_EMBED, | |
65 | PCPU_FC_PAGE, | |
66 | PCPU_FC_LPAGE, | |
67 | ||
68 | PCPU_FC_NR, | |
69 | }; | |
70 | extern const char *pcpu_fc_names[PCPU_FC_NR]; | |
71 | ||
72 | extern enum pcpu_fc pcpu_chosen_fc; | |
73 | ||
3cbc8565 TH |
74 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
75 | size_t align); | |
d4b95f80 TH |
76 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
77 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
a530b795 | 78 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
8c4bfc6e | 79 | typedef void (*pcpu_fc_map_fn_t)(void *ptr, size_t size, void *addr); |
fbf59bc9 | 80 | |
033e48fb TH |
81 | #ifdef CONFIG_NEED_PER_CPU_LPAGE_FIRST_CHUNK |
82 | extern int __init pcpu_lpage_build_unit_map( | |
83 | size_t reserved_size, ssize_t *dyn_sizep, | |
84 | size_t *unit_sizep, size_t lpage_size, | |
85 | int *unit_map, | |
86 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn); | |
87 | #endif | |
88 | ||
ce3141a2 | 89 | extern size_t __init pcpu_setup_first_chunk( |
edcb4639 | 90 | size_t static_size, size_t reserved_size, |
1d9d3257 | 91 | size_t dyn_size, size_t unit_size, |
2f39e637 | 92 | void *base_addr, const int *unit_map); |
8d408b4b | 93 | |
08fc4580 | 94 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
66c3a757 | 95 | extern ssize_t __init pcpu_embed_first_chunk( |
9a773769 | 96 | size_t reserved_size, ssize_t dyn_size); |
08fc4580 | 97 | #endif |
66c3a757 | 98 | |
08fc4580 | 99 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
00ae4064 | 100 | extern ssize_t __init pcpu_page_first_chunk( |
9a773769 | 101 | size_t reserved_size, |
d4b95f80 TH |
102 | pcpu_fc_alloc_fn_t alloc_fn, |
103 | pcpu_fc_free_fn_t free_fn, | |
104 | pcpu_fc_populate_pte_fn_t populate_pte_fn); | |
08fc4580 | 105 | #endif |
d4b95f80 | 106 | |
08fc4580 | 107 | #ifdef CONFIG_NEED_PER_CPU_LPAGE_FIRST_CHUNK |
8c4bfc6e | 108 | extern ssize_t __init pcpu_lpage_first_chunk( |
9a773769 TH |
109 | size_t reserved_size, size_t dyn_size, |
110 | size_t unit_size, size_t lpage_size, | |
111 | const int *unit_map, int nr_units, | |
8c4bfc6e TH |
112 | pcpu_fc_alloc_fn_t alloc_fn, |
113 | pcpu_fc_free_fn_t free_fn, | |
114 | pcpu_fc_map_fn_t map_fn); | |
115 | ||
116 | extern void *pcpu_lpage_remapped(void *kaddr); | |
117 | #else | |
8c4bfc6e TH |
118 | static inline void *pcpu_lpage_remapped(void *kaddr) |
119 | { | |
120 | return NULL; | |
121 | } | |
122 | #endif | |
123 | ||
f2a8205c TH |
124 | /* |
125 | * Use this to get to a cpu's version of the per-cpu object | |
126 | * dynamically allocated. Non-atomic access to the current CPU's | |
127 | * version should probably be combined with get_cpu()/put_cpu(). | |
128 | */ | |
fbf59bc9 TH |
129 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
130 | ||
edcb4639 TH |
131 | extern void *__alloc_reserved_percpu(size_t size, size_t align); |
132 | ||
e74e3962 | 133 | #else /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 TH |
134 | |
135 | struct percpu_data { | |
136 | void *ptrs[1]; | |
137 | }; | |
138 | ||
2e1483c9 CM |
139 | /* pointer disguising messes up the kmemleak objects tracking */ |
140 | #ifndef CONFIG_DEBUG_KMEMLEAK | |
fbf59bc9 | 141 | #define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata) |
2e1483c9 CM |
142 | #else |
143 | #define __percpu_disguise(pdata) (struct percpu_data *)(pdata) | |
144 | #endif | |
fbf59bc9 | 145 | |
f2a8205c TH |
146 | #define per_cpu_ptr(ptr, cpu) \ |
147 | ({ \ | |
148 | struct percpu_data *__p = __percpu_disguise(ptr); \ | |
149 | (__typeof__(ptr))__p->ptrs[(cpu)]; \ | |
150 | }) | |
151 | ||
e74e3962 | 152 | #endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 | 153 | |
f2a8205c TH |
154 | extern void *__alloc_percpu(size_t size, size_t align); |
155 | extern void free_percpu(void *__pdata); | |
1da177e4 | 156 | |
e74e3962 TH |
157 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA |
158 | extern void __init setup_per_cpu_areas(void); | |
159 | #endif | |
160 | ||
1da177e4 LT |
161 | #else /* CONFIG_SMP */ |
162 | ||
b36128c8 | 163 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); }) |
7ff6f082 | 164 | |
f2a8205c | 165 | static inline void *__alloc_percpu(size_t size, size_t align) |
7ff6f082 | 166 | { |
f2a8205c TH |
167 | /* |
168 | * Can't easily make larger alignment work with kmalloc. WARN | |
169 | * on it. Larger alignment should only be used for module | |
170 | * percpu sections on SMP for which this path isn't used. | |
171 | */ | |
e3176036 | 172 | WARN_ON_ONCE(align > SMP_CACHE_BYTES); |
d2b02615 | 173 | return kzalloc(size, GFP_KERNEL); |
7ff6f082 MP |
174 | } |
175 | ||
f2a8205c | 176 | static inline void free_percpu(void *p) |
7ff6f082 | 177 | { |
f2a8205c | 178 | kfree(p); |
1da177e4 LT |
179 | } |
180 | ||
e74e3962 TH |
181 | static inline void __init setup_per_cpu_areas(void) { } |
182 | ||
a76761b6 TH |
183 | static inline void *pcpu_lpage_remapped(void *kaddr) |
184 | { | |
185 | return NULL; | |
186 | } | |
187 | ||
1da177e4 LT |
188 | #endif /* CONFIG_SMP */ |
189 | ||
313e458f RR |
190 | #define alloc_percpu(type) (type *)__alloc_percpu(sizeof(type), \ |
191 | __alignof__(type)) | |
1da177e4 | 192 | |
066123a5 TH |
193 | /* |
194 | * Optional methods for optimized non-lvalue per-cpu variable access. | |
195 | * | |
196 | * @var can be a percpu variable or a field of it and its size should | |
197 | * equal char, int or long. percpu_read() evaluates to a lvalue and | |
198 | * all others to void. | |
199 | * | |
200 | * These operations are guaranteed to be atomic w.r.t. preemption. | |
201 | * The generic versions use plain get/put_cpu_var(). Archs are | |
202 | * encouraged to implement single-instruction alternatives which don't | |
203 | * require preemption protection. | |
204 | */ | |
205 | #ifndef percpu_read | |
206 | # define percpu_read(var) \ | |
207 | ({ \ | |
208 | typeof(per_cpu_var(var)) __tmp_var__; \ | |
209 | __tmp_var__ = get_cpu_var(var); \ | |
210 | put_cpu_var(var); \ | |
211 | __tmp_var__; \ | |
212 | }) | |
213 | #endif | |
214 | ||
215 | #define __percpu_generic_to_op(var, val, op) \ | |
216 | do { \ | |
217 | get_cpu_var(var) op val; \ | |
218 | put_cpu_var(var); \ | |
219 | } while (0) | |
220 | ||
221 | #ifndef percpu_write | |
222 | # define percpu_write(var, val) __percpu_generic_to_op(var, (val), =) | |
223 | #endif | |
224 | ||
225 | #ifndef percpu_add | |
226 | # define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=) | |
227 | #endif | |
228 | ||
229 | #ifndef percpu_sub | |
230 | # define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=) | |
231 | #endif | |
232 | ||
233 | #ifndef percpu_and | |
234 | # define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=) | |
235 | #endif | |
236 | ||
237 | #ifndef percpu_or | |
238 | # define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=) | |
239 | #endif | |
240 | ||
241 | #ifndef percpu_xor | |
242 | # define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=) | |
243 | #endif | |
244 | ||
1da177e4 | 245 | #endif /* __LINUX_PERCPU_H */ |