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); 114 115 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) 116 extern void __init setup_per_cpu_areas(void); 117 #endif 118 extern void __init percpu_init_late(void); 119 120 extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp); 121 extern void __percpu *__alloc_percpu(size_t size, size_t align); 122 extern void free_percpu(void __percpu *__pdata); 123 extern phys_addr_t per_cpu_ptr_to_phys(void *addr); 124 125 #define alloc_percpu_gfp(type, gfp) \ 126 (typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type), \ 127 __alignof__(type), gfp) 128 #define alloc_percpu(type) \ 129 (typeof(type) __percpu *)__alloc_percpu(sizeof(type), \ 130 __alignof__(type)) 131 132 #endif /* __LINUX_PERCPU_H */ 133