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