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TOMOYO Linux Cross Reference
Linux/include/linux/percpu.h

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

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