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

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