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

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

Version: ~ [ linux-5.19-rc3 ] ~ [ linux-5.18.5 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.48 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.123 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.199 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.248 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.284 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.319 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 /* number of bits per page, used to trigger a scan if blocks are > PAGE_SIZE */
 30 #define PCPU_BITS_PER_PAGE              (PAGE_SIZE >> PCPU_MIN_ALLOC_SHIFT)
 31 
 32 /*
 33  * This determines the size of each metadata block.  There are several subtle
 34  * constraints around this constant.  The reserved region must be a multiple of
 35  * PCPU_BITMAP_BLOCK_SIZE.  Additionally, PCPU_BITMAP_BLOCK_SIZE must be a
 36  * multiple of PAGE_SIZE or PAGE_SIZE must be a multiple of
 37  * PCPU_BITMAP_BLOCK_SIZE to align with the populated page map. The unit_size
 38  * also has to be a multiple of PCPU_BITMAP_BLOCK_SIZE to ensure full blocks.
 39  */
 40 #define PCPU_BITMAP_BLOCK_SIZE          PAGE_SIZE
 41 #define PCPU_BITMAP_BLOCK_BITS          (PCPU_BITMAP_BLOCK_SIZE >>      \
 42                                          PCPU_MIN_ALLOC_SHIFT)
 43 
 44 /*
 45  * Percpu allocator can serve percpu allocations before slab is
 46  * initialized which allows slab to depend on the percpu allocator.
 47  * The following two parameters decide how much resource to
 48  * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
 49  * larger than PERCPU_DYNAMIC_EARLY_SIZE.
 50  */
 51 #define PERCPU_DYNAMIC_EARLY_SLOTS      128
 52 #define PERCPU_DYNAMIC_EARLY_SIZE       (12 << 10)
 53 
 54 /*
 55  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
 56  * back on the first chunk for dynamic percpu allocation if arch is
 57  * manually allocating and mapping it for faster access (as a part of
 58  * large page mapping for example).
 59  *
 60  * The following values give between one and two pages of free space
 61  * after typical minimal boot (2-way SMP, single disk and NIC) with
 62  * both defconfig and a distro config on x86_64 and 32.  More
 63  * intelligent way to determine this would be nice.
 64  */
 65 #if BITS_PER_LONG > 32
 66 #define PERCPU_DYNAMIC_RESERVE          (28 << 10)
 67 #else
 68 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
 69 #endif
 70 
 71 extern void *pcpu_base_addr;
 72 extern const unsigned long *pcpu_unit_offsets;
 73 
 74 struct pcpu_group_info {
 75         int                     nr_units;       /* aligned # of units */
 76         unsigned long           base_offset;    /* base address offset */
 77         unsigned int            *cpu_map;       /* unit->cpu map, empty
 78                                                  * entries contain NR_CPUS */
 79 };
 80 
 81 struct pcpu_alloc_info {
 82         size_t                  static_size;
 83         size_t                  reserved_size;
 84         size_t                  dyn_size;
 85         size_t                  unit_size;
 86         size_t                  atom_size;
 87         size_t                  alloc_size;
 88         size_t                  __ai_size;      /* internal, don't use */
 89         int                     nr_groups;      /* 0 if grouping unnecessary */
 90         struct pcpu_group_info  groups[];
 91 };
 92 
 93 enum pcpu_fc {
 94         PCPU_FC_AUTO,
 95         PCPU_FC_EMBED,
 96         PCPU_FC_PAGE,
 97 
 98         PCPU_FC_NR,
 99 };
100 extern const char * const pcpu_fc_names[PCPU_FC_NR];
101 
102 extern enum pcpu_fc pcpu_chosen_fc;
103 
104 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
105                                      size_t align);
106 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
107 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
108 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
109 
110 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
111                                                              int nr_units);
112 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
113 
114 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
115                                          void *base_addr);
116 
117 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
118 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
119                                 size_t atom_size,
120                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
121                                 pcpu_fc_alloc_fn_t alloc_fn,
122                                 pcpu_fc_free_fn_t free_fn);
123 #endif
124 
125 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
126 extern int __init pcpu_page_first_chunk(size_t reserved_size,
127                                 pcpu_fc_alloc_fn_t alloc_fn,
128                                 pcpu_fc_free_fn_t free_fn,
129                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
130 #endif
131 
132 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
133 extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr);
134 extern bool is_kernel_percpu_address(unsigned long addr);
135 
136 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
137 extern void __init setup_per_cpu_areas(void);
138 #endif
139 
140 extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp);
141 extern void __percpu *__alloc_percpu(size_t size, size_t align);
142 extern void free_percpu(void __percpu *__pdata);
143 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
144 
145 #define alloc_percpu_gfp(type, gfp)                                     \
146         (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type),       \
147                                                 __alignof__(type), gfp)
148 #define alloc_percpu(type)                                              \
149         (typeof(type) __percpu *)__alloc_percpu(sizeof(type),           \
150                                                 __alignof__(type))
151 
152 extern unsigned long pcpu_nr_pages(void);
153 
154 #endif /* __LINUX_PERCPU_H */
155 

~ [ 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