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Linux/include/linux/percpu.h

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  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 void __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 */
149 

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