rtlwifi: rtl8192cu: Convert inline routines to little-endian words
[linux-2.6-microblaze.git] / include / linux / percpu.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_PERCPU_H
3 #define __LINUX_PERCPU_H
4
5 #include <linux/mmdebug.h>
6 #include <linux/preempt.h>
7 #include <linux/smp.h>
8 #include <linux/cpumask.h>
9 #include <linux/printk.h>
10 #include <linux/pfn.h>
11 #include <linux/init.h>
12
13 #include <asm/percpu.h>
14
15 /* enough to cover all DEFINE_PER_CPUs in modules */
16 #ifdef CONFIG_MODULES
17 #define PERCPU_MODULE_RESERVE           (8 << 10)
18 #else
19 #define PERCPU_MODULE_RESERVE           0
20 #endif
21
22 /* minimum unit size, also is the maximum supported allocation size */
23 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(32 << 10)
24
25 /* minimum allocation size and shift in bytes */
26 #define PCPU_MIN_ALLOC_SHIFT            2
27 #define PCPU_MIN_ALLOC_SIZE             (1 << PCPU_MIN_ALLOC_SHIFT)
28
29 /*
30  * The PCPU_BITMAP_BLOCK_SIZE must be the same size as PAGE_SIZE as the
31  * updating of hints is used to manage the nr_empty_pop_pages in both
32  * the chunk and globally.
33  */
34 #define PCPU_BITMAP_BLOCK_SIZE          PAGE_SIZE
35 #define PCPU_BITMAP_BLOCK_BITS          (PCPU_BITMAP_BLOCK_SIZE >>      \
36                                          PCPU_MIN_ALLOC_SHIFT)
37
38 /*
39  * Percpu allocator can serve percpu allocations before slab is
40  * initialized which allows slab to depend on the percpu allocator.
41  * The following two parameters decide how much resource to
42  * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
43  * larger than PERCPU_DYNAMIC_EARLY_SIZE.
44  */
45 #define PERCPU_DYNAMIC_EARLY_SLOTS      128
46 #define PERCPU_DYNAMIC_EARLY_SIZE       (12 << 10)
47
48 /*
49  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
50  * back on the first chunk for dynamic percpu allocation if arch is
51  * manually allocating and mapping it for faster access (as a part of
52  * large page mapping for example).
53  *
54  * The following values give between one and two pages of free space
55  * after typical minimal boot (2-way SMP, single disk and NIC) with
56  * both defconfig and a distro config on x86_64 and 32.  More
57  * intelligent way to determine this would be nice.
58  */
59 #if BITS_PER_LONG > 32
60 #define PERCPU_DYNAMIC_RESERVE          (28 << 10)
61 #else
62 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
63 #endif
64
65 extern void *pcpu_base_addr;
66 extern const unsigned long *pcpu_unit_offsets;
67
68 struct pcpu_group_info {
69         int                     nr_units;       /* aligned # of units */
70         unsigned long           base_offset;    /* base address offset */
71         unsigned int            *cpu_map;       /* unit->cpu map, empty
72                                                  * entries contain NR_CPUS */
73 };
74
75 struct pcpu_alloc_info {
76         size_t                  static_size;
77         size_t                  reserved_size;
78         size_t                  dyn_size;
79         size_t                  unit_size;
80         size_t                  atom_size;
81         size_t                  alloc_size;
82         size_t                  __ai_size;      /* internal, don't use */
83         int                     nr_groups;      /* 0 if grouping unnecessary */
84         struct pcpu_group_info  groups[];
85 };
86
87 enum pcpu_fc {
88         PCPU_FC_AUTO,
89         PCPU_FC_EMBED,
90         PCPU_FC_PAGE,
91
92         PCPU_FC_NR,
93 };
94 extern const char * const pcpu_fc_names[PCPU_FC_NR];
95
96 extern enum pcpu_fc pcpu_chosen_fc;
97
98 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
99                                      size_t align);
100 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
101 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
102 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
103
104 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
105                                                              int nr_units);
106 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
107
108 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
109                                          void *base_addr);
110
111 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
112 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
113                                 size_t atom_size,
114                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
115                                 pcpu_fc_alloc_fn_t alloc_fn,
116                                 pcpu_fc_free_fn_t free_fn);
117 #endif
118
119 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
120 extern int __init pcpu_page_first_chunk(size_t reserved_size,
121                                 pcpu_fc_alloc_fn_t alloc_fn,
122                                 pcpu_fc_free_fn_t free_fn,
123                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
124 #endif
125
126 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
127 extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr);
128 extern bool is_kernel_percpu_address(unsigned long addr);
129
130 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
131 extern void __init setup_per_cpu_areas(void);
132 #endif
133
134 extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp);
135 extern void __percpu *__alloc_percpu(size_t size, size_t align);
136 extern void free_percpu(void __percpu *__pdata);
137 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
138
139 #define alloc_percpu_gfp(type, gfp)                                     \
140         (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type),       \
141                                                 __alignof__(type), gfp)
142 #define alloc_percpu(type)                                              \
143         (typeof(type) __percpu *)__alloc_percpu(sizeof(type),           \
144                                                 __alignof__(type))
145
146 extern unsigned long pcpu_nr_pages(void);
147
148 #endif /* __LINUX_PERCPU_H */