| 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 */ |