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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 | |
d4b95f80 TH |
62 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size); |
63 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); | |
64 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); | |
8c4bfc6e | 65 | typedef void (*pcpu_fc_map_fn_t)(void *ptr, size_t size, void *addr); |
fbf59bc9 | 66 | |
ce3141a2 | 67 | extern size_t __init pcpu_setup_first_chunk( |
edcb4639 | 68 | size_t static_size, size_t reserved_size, |
38a6be52 | 69 | ssize_t dyn_size, size_t unit_size, |
2f39e637 | 70 | void *base_addr, const int *unit_map); |
8d408b4b | 71 | |
66c3a757 TH |
72 | extern ssize_t __init pcpu_embed_first_chunk( |
73 | size_t static_size, size_t reserved_size, | |
788e5abc | 74 | ssize_t dyn_size); |
66c3a757 | 75 | |
d4b95f80 TH |
76 | extern ssize_t __init pcpu_4k_first_chunk( |
77 | size_t static_size, size_t reserved_size, | |
78 | pcpu_fc_alloc_fn_t alloc_fn, | |
79 | pcpu_fc_free_fn_t free_fn, | |
80 | pcpu_fc_populate_pte_fn_t populate_pte_fn); | |
81 | ||
8c4bfc6e TH |
82 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
83 | extern ssize_t __init pcpu_lpage_first_chunk( | |
84 | size_t static_size, size_t reserved_size, | |
85 | ssize_t dyn_size, size_t lpage_size, | |
86 | pcpu_fc_alloc_fn_t alloc_fn, | |
87 | pcpu_fc_free_fn_t free_fn, | |
88 | pcpu_fc_map_fn_t map_fn); | |
89 | ||
90 | extern void *pcpu_lpage_remapped(void *kaddr); | |
91 | #else | |
92 | static inline ssize_t __init pcpu_lpage_first_chunk( | |
93 | size_t static_size, size_t reserved_size, | |
94 | ssize_t dyn_size, size_t lpage_size, | |
95 | pcpu_fc_alloc_fn_t alloc_fn, | |
96 | pcpu_fc_free_fn_t free_fn, | |
97 | pcpu_fc_map_fn_t map_fn) | |
98 | { | |
99 | return -EINVAL; | |
100 | } | |
101 | ||
102 | static inline void *pcpu_lpage_remapped(void *kaddr) | |
103 | { | |
104 | return NULL; | |
105 | } | |
106 | #endif | |
107 | ||
f2a8205c TH |
108 | /* |
109 | * Use this to get to a cpu's version of the per-cpu object | |
110 | * dynamically allocated. Non-atomic access to the current CPU's | |
111 | * version should probably be combined with get_cpu()/put_cpu(). | |
112 | */ | |
fbf59bc9 TH |
113 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
114 | ||
edcb4639 TH |
115 | extern void *__alloc_reserved_percpu(size_t size, size_t align); |
116 | ||
e74e3962 | 117 | #else /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 TH |
118 | |
119 | struct percpu_data { | |
120 | void *ptrs[1]; | |
121 | }; | |
122 | ||
2e1483c9 CM |
123 | /* pointer disguising messes up the kmemleak objects tracking */ |
124 | #ifndef CONFIG_DEBUG_KMEMLEAK | |
fbf59bc9 | 125 | #define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata) |
2e1483c9 CM |
126 | #else |
127 | #define __percpu_disguise(pdata) (struct percpu_data *)(pdata) | |
128 | #endif | |
fbf59bc9 | 129 | |
f2a8205c TH |
130 | #define per_cpu_ptr(ptr, cpu) \ |
131 | ({ \ | |
132 | struct percpu_data *__p = __percpu_disguise(ptr); \ | |
133 | (__typeof__(ptr))__p->ptrs[(cpu)]; \ | |
134 | }) | |
135 | ||
e74e3962 | 136 | #endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
fbf59bc9 | 137 | |
f2a8205c TH |
138 | extern void *__alloc_percpu(size_t size, size_t align); |
139 | extern void free_percpu(void *__pdata); | |
1da177e4 | 140 | |
e74e3962 TH |
141 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA |
142 | extern void __init setup_per_cpu_areas(void); | |
143 | #endif | |
144 | ||
1da177e4 LT |
145 | #else /* CONFIG_SMP */ |
146 | ||
b36128c8 | 147 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); }) |
7ff6f082 | 148 | |
f2a8205c | 149 | static inline void *__alloc_percpu(size_t size, size_t align) |
7ff6f082 | 150 | { |
f2a8205c TH |
151 | /* |
152 | * Can't easily make larger alignment work with kmalloc. WARN | |
153 | * on it. Larger alignment should only be used for module | |
154 | * percpu sections on SMP for which this path isn't used. | |
155 | */ | |
e3176036 | 156 | WARN_ON_ONCE(align > SMP_CACHE_BYTES); |
d2b02615 | 157 | return kzalloc(size, GFP_KERNEL); |
7ff6f082 MP |
158 | } |
159 | ||
f2a8205c | 160 | static inline void free_percpu(void *p) |
7ff6f082 | 161 | { |
f2a8205c | 162 | kfree(p); |
1da177e4 LT |
163 | } |
164 | ||
e74e3962 TH |
165 | static inline void __init setup_per_cpu_areas(void) { } |
166 | ||
1da177e4 LT |
167 | #endif /* CONFIG_SMP */ |
168 | ||
313e458f RR |
169 | #define alloc_percpu(type) (type *)__alloc_percpu(sizeof(type), \ |
170 | __alignof__(type)) | |
1da177e4 | 171 | |
066123a5 TH |
172 | /* |
173 | * Optional methods for optimized non-lvalue per-cpu variable access. | |
174 | * | |
175 | * @var can be a percpu variable or a field of it and its size should | |
176 | * equal char, int or long. percpu_read() evaluates to a lvalue and | |
177 | * all others to void. | |
178 | * | |
179 | * These operations are guaranteed to be atomic w.r.t. preemption. | |
180 | * The generic versions use plain get/put_cpu_var(). Archs are | |
181 | * encouraged to implement single-instruction alternatives which don't | |
182 | * require preemption protection. | |
183 | */ | |
184 | #ifndef percpu_read | |
185 | # define percpu_read(var) \ | |
186 | ({ \ | |
187 | typeof(per_cpu_var(var)) __tmp_var__; \ | |
188 | __tmp_var__ = get_cpu_var(var); \ | |
189 | put_cpu_var(var); \ | |
190 | __tmp_var__; \ | |
191 | }) | |
192 | #endif | |
193 | ||
194 | #define __percpu_generic_to_op(var, val, op) \ | |
195 | do { \ | |
196 | get_cpu_var(var) op val; \ | |
197 | put_cpu_var(var); \ | |
198 | } while (0) | |
199 | ||
200 | #ifndef percpu_write | |
201 | # define percpu_write(var, val) __percpu_generic_to_op(var, (val), =) | |
202 | #endif | |
203 | ||
204 | #ifndef percpu_add | |
205 | # define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=) | |
206 | #endif | |
207 | ||
208 | #ifndef percpu_sub | |
209 | # define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=) | |
210 | #endif | |
211 | ||
212 | #ifndef percpu_and | |
213 | # define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=) | |
214 | #endif | |
215 | ||
216 | #ifndef percpu_or | |
217 | # define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=) | |
218 | #endif | |
219 | ||
220 | #ifndef percpu_xor | |
221 | # define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=) | |
222 | #endif | |
223 | ||
1da177e4 | 224 | #endif /* __LINUX_PERCPU_H */ |