~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #ifndef PERCPU_ENOUGH_ROOM
 22 #define PERCPU_ENOUGH_ROOM                                              \
 23         (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) +      \
 24          PERCPU_MODULE_RESERVE)
 25 #endif
 26 
 27 /* minimum unit size, also is the maximum supported allocation size */
 28 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(32 << 10)
 29 
 30 /*
 31  * Percpu allocator can serve percpu allocations before slab is
 32  * initialized which allows slab to depend on the percpu allocator.
 33  * The following two parameters decide how much resource to
 34  * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
 35  * larger than PERCPU_DYNAMIC_EARLY_SIZE.
 36  */
 37 #define PERCPU_DYNAMIC_EARLY_SLOTS      128
 38 #define PERCPU_DYNAMIC_EARLY_SIZE       (12 << 10)
 39 
 40 /*
 41  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
 42  * back on the first chunk for dynamic percpu allocation if arch is
 43  * manually allocating and mapping it for faster access (as a part of
 44  * large page mapping for example).
 45  *
 46  * The following values give between one and two pages of free space
 47  * after typical minimal boot (2-way SMP, single disk and NIC) with
 48  * both defconfig and a distro config on x86_64 and 32.  More
 49  * intelligent way to determine this would be nice.
 50  */
 51 #if BITS_PER_LONG > 32
 52 #define PERCPU_DYNAMIC_RESERVE          (28 << 10)
 53 #else
 54 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
 55 #endif
 56 
 57 extern void *pcpu_base_addr;
 58 extern const unsigned long *pcpu_unit_offsets;
 59 
 60 struct pcpu_group_info {
 61         int                     nr_units;       /* aligned # of units */
 62         unsigned long           base_offset;    /* base address offset */
 63         unsigned int            *cpu_map;       /* unit->cpu map, empty
 64                                                  * entries contain NR_CPUS */
 65 };
 66 
 67 struct pcpu_alloc_info {
 68         size_t                  static_size;
 69         size_t                  reserved_size;
 70         size_t                  dyn_size;
 71         size_t                  unit_size;
 72         size_t                  atom_size;
 73         size_t                  alloc_size;
 74         size_t                  __ai_size;      /* internal, don't use */
 75         int                     nr_groups;      /* 0 if grouping unnecessary */
 76         struct pcpu_group_info  groups[];
 77 };
 78 
 79 enum pcpu_fc {
 80         PCPU_FC_AUTO,
 81         PCPU_FC_EMBED,
 82         PCPU_FC_PAGE,
 83 
 84         PCPU_FC_NR,
 85 };
 86 extern const char * const pcpu_fc_names[PCPU_FC_NR];
 87 
 88 extern enum pcpu_fc pcpu_chosen_fc;
 89 
 90 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
 91                                      size_t align);
 92 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
 93 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
 94 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
 95 
 96 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
 97                                                              int nr_units);
 98 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
 99 
100 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
101                                          void *base_addr);
102 
103 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
104 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
105                                 size_t atom_size,
106                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
107                                 pcpu_fc_alloc_fn_t alloc_fn,
108                                 pcpu_fc_free_fn_t free_fn);
109 #endif
110 
111 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
112 extern int __init pcpu_page_first_chunk(size_t reserved_size,
113                                 pcpu_fc_alloc_fn_t alloc_fn,
114                                 pcpu_fc_free_fn_t free_fn,
115                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
116 #endif
117 
118 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
119 extern bool is_kernel_percpu_address(unsigned long addr);
120 
121 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
122 extern void __init setup_per_cpu_areas(void);
123 #endif
124 extern void __init percpu_init_late(void);
125 
126 extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp);
127 extern void __percpu *__alloc_percpu(size_t size, size_t align);
128 extern void free_percpu(void __percpu *__pdata);
129 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
130 
131 #define alloc_percpu_gfp(type, gfp)                                     \
132         (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type),       \
133                                                 __alignof__(type), gfp)
134 #define alloc_percpu(type)                                              \
135         (typeof(type) __percpu *)__alloc_percpu(sizeof(type),           \
136                                                 __alignof__(type))
137 
138 /* To avoid include hell, as printk can not declare this, we declare it here */
139 DECLARE_PER_CPU(printk_func_t, printk_func);
140 
141 #endif /* __LINUX_PERCPU_H */
142 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp