Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1 | /* |
Tejun Heo | 88999a8 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 2 | * mm/percpu.c - percpu memory allocator |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2009 SUSE Linux Products GmbH |
| 5 | * Copyright (C) 2009 Tejun Heo <tj@kernel.org> |
| 6 | * |
Dennis Zhou (Facebook) | 9c01516 | 2017-07-15 22:23:09 -0400 | [diff] [blame] | 7 | * This file is released under the GPLv2 license. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 8 | * |
Dennis Zhou (Facebook) | 9c01516 | 2017-07-15 22:23:09 -0400 | [diff] [blame] | 9 | * The percpu allocator handles both static and dynamic areas. Percpu |
| 10 | * areas are allocated in chunks which are divided into units. There is |
| 11 | * a 1-to-1 mapping for units to possible cpus. These units are grouped |
| 12 | * based on NUMA properties of the machine. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 13 | * |
| 14 | * c0 c1 c2 |
| 15 | * ------------------- ------------------- ------------ |
| 16 | * | u0 | u1 | u2 | u3 | | u0 | u1 | u2 | u3 | | u0 | u1 | u |
| 17 | * ------------------- ...... ------------------- .... ------------ |
| 18 | * |
Dennis Zhou (Facebook) | 9c01516 | 2017-07-15 22:23:09 -0400 | [diff] [blame] | 19 | * Allocation is done by offsets into a unit's address space. Ie., an |
| 20 | * area of 512 bytes at 6k in c1 occupies 512 bytes at 6k in c1:u0, |
| 21 | * c1:u1, c1:u2, etc. On NUMA machines, the mapping may be non-linear |
| 22 | * and even sparse. Access is handled by configuring percpu base |
| 23 | * registers according to the cpu to unit mappings and offsetting the |
| 24 | * base address using pcpu_unit_size. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 25 | * |
Dennis Zhou (Facebook) | 9c01516 | 2017-07-15 22:23:09 -0400 | [diff] [blame] | 26 | * There is special consideration for the first chunk which must handle |
| 27 | * the static percpu variables in the kernel image as allocation services |
| 28 | * are not online yet. In short, the first chunk is structure like so: |
| 29 | * |
| 30 | * <Static | [Reserved] | Dynamic> |
| 31 | * |
| 32 | * The static data is copied from the original section managed by the |
| 33 | * linker. The reserved section, if non-zero, primarily manages static |
| 34 | * percpu variables from kernel modules. Finally, the dynamic section |
| 35 | * takes care of normal allocations. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 36 | * |
| 37 | * Allocation state in each chunk is kept using an array of integers |
| 38 | * on chunk->map. A positive value in the map represents a free |
| 39 | * region and negative allocated. Allocation inside a chunk is done |
| 40 | * by scanning this map sequentially and serving the first matching |
| 41 | * entry. This is mostly copied from the percpu_modalloc() allocator. |
Christoph Lameter | e1b9aa3 | 2009-04-02 13:21:44 +0900 | [diff] [blame] | 42 | * Chunks can be determined from the address using the index field |
| 43 | * in the page struct. The index field contains a pointer to the chunk. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 44 | * |
Dennis Zhou (Facebook) | 9c01516 | 2017-07-15 22:23:09 -0400 | [diff] [blame] | 45 | * These chunks are organized into lists according to free_size and |
| 46 | * tries to allocate from the fullest chunk first. Each chunk maintains |
| 47 | * a maximum contiguous area size hint which is guaranteed to be equal |
| 48 | * to or larger than the maximum contiguous area in the chunk. This |
| 49 | * helps prevent the allocator from iterating over chunks unnecessarily. |
| 50 | * |
Masahiro Yamada | 4091fb9 | 2017-02-27 14:29:56 -0800 | [diff] [blame] | 51 | * To use this allocator, arch code should do the following: |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 52 | * |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 53 | * - define __addr_to_pcpu_ptr() and __pcpu_ptr_to_addr() to translate |
Tejun Heo | e010098 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 54 | * regular address to percpu pointer and back if they need to be |
| 55 | * different from the default |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 56 | * |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 57 | * - use pcpu_setup_first_chunk() during percpu area initialization to |
| 58 | * setup the first chunk containing the kernel static percpu area |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 59 | */ |
| 60 | |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 61 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 62 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 63 | #include <linux/bitmap.h> |
| 64 | #include <linux/bootmem.h> |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 65 | #include <linux/err.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 66 | #include <linux/list.h> |
Tejun Heo | a530b79 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 67 | #include <linux/log2.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 68 | #include <linux/mm.h> |
| 69 | #include <linux/module.h> |
| 70 | #include <linux/mutex.h> |
| 71 | #include <linux/percpu.h> |
| 72 | #include <linux/pfn.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 73 | #include <linux/slab.h> |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 74 | #include <linux/spinlock.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 75 | #include <linux/vmalloc.h> |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 76 | #include <linux/workqueue.h> |
Catalin Marinas | f528f0b | 2011-09-26 17:12:53 +0100 | [diff] [blame] | 77 | #include <linux/kmemleak.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 78 | |
| 79 | #include <asm/cacheflush.h> |
Tejun Heo | e010098 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 80 | #include <asm/sections.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 81 | #include <asm/tlbflush.h> |
Vivek Goyal | 3b034b0 | 2009-11-24 15:50:03 +0900 | [diff] [blame] | 82 | #include <asm/io.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 83 | |
Dennis Zhou | df95e79 | 2017-06-19 19:28:32 -0400 | [diff] [blame] | 84 | #define CREATE_TRACE_POINTS |
| 85 | #include <trace/events/percpu.h> |
| 86 | |
Dennis Zhou | 8fa3ed8 | 2017-06-19 19:28:30 -0400 | [diff] [blame] | 87 | #include "percpu-internal.h" |
| 88 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 89 | #define PCPU_SLOT_BASE_SHIFT 5 /* 1-31 shares the same slot */ |
| 90 | #define PCPU_DFL_MAP_ALLOC 16 /* start a map with 16 ents */ |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 91 | #define PCPU_ATOMIC_MAP_MARGIN_LOW 32 |
| 92 | #define PCPU_ATOMIC_MAP_MARGIN_HIGH 64 |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 93 | #define PCPU_EMPTY_POP_PAGES_LOW 2 |
| 94 | #define PCPU_EMPTY_POP_PAGES_HIGH 4 |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 95 | |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 96 | #ifdef CONFIG_SMP |
Tejun Heo | e010098 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 97 | /* default addr <-> pcpu_ptr mapping, override in asm/percpu.h if necessary */ |
| 98 | #ifndef __addr_to_pcpu_ptr |
| 99 | #define __addr_to_pcpu_ptr(addr) \ |
Tejun Heo | 43cf38e | 2010-02-02 14:38:57 +0900 | [diff] [blame] | 100 | (void __percpu *)((unsigned long)(addr) - \ |
| 101 | (unsigned long)pcpu_base_addr + \ |
| 102 | (unsigned long)__per_cpu_start) |
Tejun Heo | e010098 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 103 | #endif |
| 104 | #ifndef __pcpu_ptr_to_addr |
| 105 | #define __pcpu_ptr_to_addr(ptr) \ |
Tejun Heo | 43cf38e | 2010-02-02 14:38:57 +0900 | [diff] [blame] | 106 | (void __force *)((unsigned long)(ptr) + \ |
| 107 | (unsigned long)pcpu_base_addr - \ |
| 108 | (unsigned long)__per_cpu_start) |
Tejun Heo | e010098 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 109 | #endif |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 110 | #else /* CONFIG_SMP */ |
| 111 | /* on UP, it's always identity mapped */ |
| 112 | #define __addr_to_pcpu_ptr(addr) (void __percpu *)(addr) |
| 113 | #define __pcpu_ptr_to_addr(ptr) (void __force *)(ptr) |
| 114 | #endif /* CONFIG_SMP */ |
Tejun Heo | e010098 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 115 | |
Daniel Micay | 1328710 | 2017-05-10 13:36:37 -0400 | [diff] [blame] | 116 | static int pcpu_unit_pages __ro_after_init; |
| 117 | static int pcpu_unit_size __ro_after_init; |
| 118 | static int pcpu_nr_units __ro_after_init; |
| 119 | static int pcpu_atom_size __ro_after_init; |
Dennis Zhou | 8fa3ed8 | 2017-06-19 19:28:30 -0400 | [diff] [blame] | 120 | int pcpu_nr_slots __ro_after_init; |
Daniel Micay | 1328710 | 2017-05-10 13:36:37 -0400 | [diff] [blame] | 121 | static size_t pcpu_chunk_struct_size __ro_after_init; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 122 | |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 123 | /* cpus with the lowest and highest unit addresses */ |
Daniel Micay | 1328710 | 2017-05-10 13:36:37 -0400 | [diff] [blame] | 124 | static unsigned int pcpu_low_unit_cpu __ro_after_init; |
| 125 | static unsigned int pcpu_high_unit_cpu __ro_after_init; |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 126 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 127 | /* the address of the first chunk which starts with the kernel static area */ |
Daniel Micay | 1328710 | 2017-05-10 13:36:37 -0400 | [diff] [blame] | 128 | void *pcpu_base_addr __ro_after_init; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 129 | EXPORT_SYMBOL_GPL(pcpu_base_addr); |
| 130 | |
Daniel Micay | 1328710 | 2017-05-10 13:36:37 -0400 | [diff] [blame] | 131 | static const int *pcpu_unit_map __ro_after_init; /* cpu -> unit */ |
| 132 | const unsigned long *pcpu_unit_offsets __ro_after_init; /* cpu -> unit offset */ |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 133 | |
Tejun Heo | 6563297 | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 134 | /* group information, used for vm allocation */ |
Daniel Micay | 1328710 | 2017-05-10 13:36:37 -0400 | [diff] [blame] | 135 | static int pcpu_nr_groups __ro_after_init; |
| 136 | static const unsigned long *pcpu_group_offsets __ro_after_init; |
| 137 | static const size_t *pcpu_group_sizes __ro_after_init; |
Tejun Heo | 6563297 | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 138 | |
Tejun Heo | ae9e6bc9 | 2009-04-02 13:19:54 +0900 | [diff] [blame] | 139 | /* |
| 140 | * The first chunk which always exists. Note that unlike other |
| 141 | * chunks, this one can be allocated and mapped in several different |
| 142 | * ways and thus often doesn't live in the vmalloc area. |
| 143 | */ |
Dennis Zhou | 8fa3ed8 | 2017-06-19 19:28:30 -0400 | [diff] [blame] | 144 | struct pcpu_chunk *pcpu_first_chunk __ro_after_init; |
Tejun Heo | ae9e6bc9 | 2009-04-02 13:19:54 +0900 | [diff] [blame] | 145 | |
| 146 | /* |
| 147 | * Optional reserved chunk. This chunk reserves part of the first |
Dennis Zhou (Facebook) | e226670 | 2017-07-24 19:01:59 -0400 | [diff] [blame] | 148 | * chunk and serves it for reserved allocations. When the reserved |
| 149 | * region doesn't exist, the following variable is NULL. |
Tejun Heo | ae9e6bc9 | 2009-04-02 13:19:54 +0900 | [diff] [blame] | 150 | */ |
Dennis Zhou | 8fa3ed8 | 2017-06-19 19:28:30 -0400 | [diff] [blame] | 151 | struct pcpu_chunk *pcpu_reserved_chunk __ro_after_init; |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 152 | |
Dennis Zhou | 8fa3ed8 | 2017-06-19 19:28:30 -0400 | [diff] [blame] | 153 | DEFINE_SPINLOCK(pcpu_lock); /* all internal data structures */ |
Tejun Heo | 6710e59 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 154 | static DEFINE_MUTEX(pcpu_alloc_mutex); /* chunk create/destroy, [de]pop, map ext */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 155 | |
Dennis Zhou | 8fa3ed8 | 2017-06-19 19:28:30 -0400 | [diff] [blame] | 156 | struct list_head *pcpu_slot __ro_after_init; /* chunk list slots */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 157 | |
Tejun Heo | 4f996e2 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 158 | /* chunks which need their map areas extended, protected by pcpu_lock */ |
| 159 | static LIST_HEAD(pcpu_map_extend_chunks); |
| 160 | |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 161 | /* |
| 162 | * The number of empty populated pages, protected by pcpu_lock. The |
| 163 | * reserved chunk doesn't contribute to the count. |
| 164 | */ |
Dennis Zhou (Facebook) | 6b9b6f3 | 2017-07-15 22:23:08 -0400 | [diff] [blame] | 165 | int pcpu_nr_empty_pop_pages; |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 166 | |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 167 | /* |
| 168 | * Balance work is used to populate or destroy chunks asynchronously. We |
| 169 | * try to keep the number of populated free pages between |
| 170 | * PCPU_EMPTY_POP_PAGES_LOW and HIGH for atomic allocations and at most one |
| 171 | * empty chunk. |
| 172 | */ |
Tejun Heo | fe6bd8c | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 173 | static void pcpu_balance_workfn(struct work_struct *work); |
| 174 | static DECLARE_WORK(pcpu_balance_work, pcpu_balance_workfn); |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 175 | static bool pcpu_async_enabled __read_mostly; |
| 176 | static bool pcpu_atomic_alloc_failed; |
| 177 | |
| 178 | static void pcpu_schedule_balance_work(void) |
| 179 | { |
| 180 | if (pcpu_async_enabled) |
| 181 | schedule_work(&pcpu_balance_work); |
| 182 | } |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 183 | |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 184 | /** |
Dennis Zhou (Facebook) | 560f2c2 | 2017-07-24 19:02:06 -0400 | [diff] [blame] | 185 | * pcpu_addr_in_chunk - check if the address is served from this chunk |
| 186 | * @chunk: chunk of interest |
| 187 | * @addr: percpu address |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 188 | * |
| 189 | * RETURNS: |
Dennis Zhou (Facebook) | 560f2c2 | 2017-07-24 19:02:06 -0400 | [diff] [blame] | 190 | * True if the address is served from this chunk. |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 191 | */ |
Dennis Zhou (Facebook) | 560f2c2 | 2017-07-24 19:02:06 -0400 | [diff] [blame] | 192 | static bool pcpu_addr_in_chunk(struct pcpu_chunk *chunk, void *addr) |
Tejun Heo | 020ec65 | 2010-04-09 18:57:00 +0900 | [diff] [blame] | 193 | { |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 194 | void *start_addr, *end_addr; |
Tejun Heo | 020ec65 | 2010-04-09 18:57:00 +0900 | [diff] [blame] | 195 | |
Dennis Zhou (Facebook) | 560f2c2 | 2017-07-24 19:02:06 -0400 | [diff] [blame] | 196 | if (!chunk) |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 197 | return false; |
| 198 | |
Dennis Zhou (Facebook) | 560f2c2 | 2017-07-24 19:02:06 -0400 | [diff] [blame] | 199 | start_addr = chunk->base_addr + chunk->start_offset; |
| 200 | end_addr = chunk->base_addr + chunk->nr_pages * PAGE_SIZE - |
| 201 | chunk->end_offset; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 202 | |
| 203 | return addr >= start_addr && addr < end_addr; |
Tejun Heo | 020ec65 | 2010-04-09 18:57:00 +0900 | [diff] [blame] | 204 | } |
| 205 | |
Tejun Heo | d9b55ee | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 206 | static int __pcpu_size_to_slot(int size) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 207 | { |
Tejun Heo | cae3aeb | 2009-02-21 16:56:23 +0900 | [diff] [blame] | 208 | int highbit = fls(size); /* size is in bytes */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 209 | return max(highbit - PCPU_SLOT_BASE_SHIFT + 2, 1); |
| 210 | } |
| 211 | |
Tejun Heo | d9b55ee | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 212 | static int pcpu_size_to_slot(int size) |
| 213 | { |
| 214 | if (size == pcpu_unit_size) |
| 215 | return pcpu_nr_slots - 1; |
| 216 | return __pcpu_size_to_slot(size); |
| 217 | } |
| 218 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 219 | static int pcpu_chunk_slot(const struct pcpu_chunk *chunk) |
| 220 | { |
| 221 | if (chunk->free_size < sizeof(int) || chunk->contig_hint < sizeof(int)) |
| 222 | return 0; |
| 223 | |
| 224 | return pcpu_size_to_slot(chunk->free_size); |
| 225 | } |
| 226 | |
Tejun Heo | 88999a8 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 227 | /* set the pointer to a chunk in a page struct */ |
| 228 | static void pcpu_set_page_chunk(struct page *page, struct pcpu_chunk *pcpu) |
| 229 | { |
| 230 | page->index = (unsigned long)pcpu; |
| 231 | } |
| 232 | |
| 233 | /* obtain pointer to a chunk from a page struct */ |
| 234 | static struct pcpu_chunk *pcpu_get_page_chunk(struct page *page) |
| 235 | { |
| 236 | return (struct pcpu_chunk *)page->index; |
| 237 | } |
| 238 | |
| 239 | static int __maybe_unused pcpu_page_idx(unsigned int cpu, int page_idx) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 240 | { |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 241 | return pcpu_unit_map[cpu] * pcpu_unit_pages + page_idx; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 242 | } |
| 243 | |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 244 | static unsigned long pcpu_unit_page_offset(unsigned int cpu, int page_idx) |
| 245 | { |
| 246 | return pcpu_unit_offsets[cpu] + (page_idx << PAGE_SHIFT); |
| 247 | } |
| 248 | |
Tejun Heo | 9983b6f0 | 2010-06-18 11:44:31 +0200 | [diff] [blame] | 249 | static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk, |
| 250 | unsigned int cpu, int page_idx) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 251 | { |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 252 | return (unsigned long)chunk->base_addr + |
| 253 | pcpu_unit_page_offset(cpu, page_idx); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 254 | } |
| 255 | |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 256 | static void pcpu_next_unpop(unsigned long *bitmap, int *rs, int *re, int end) |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 257 | { |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 258 | *rs = find_next_zero_bit(bitmap, end, *rs); |
| 259 | *re = find_next_bit(bitmap, end, *rs + 1); |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 260 | } |
| 261 | |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 262 | static void pcpu_next_pop(unsigned long *bitmap, int *rs, int *re, int end) |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 263 | { |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 264 | *rs = find_next_bit(bitmap, end, *rs); |
| 265 | *re = find_next_zero_bit(bitmap, end, *rs + 1); |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | /* |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 269 | * Bitmap region iterators. Iterates over the bitmap between |
| 270 | * [@start, @end) in @chunk. @rs and @re should be integer variables |
| 271 | * and will be set to start and end index of the current free region. |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 272 | */ |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 273 | #define pcpu_for_each_unpop_region(bitmap, rs, re, start, end) \ |
| 274 | for ((rs) = (start), pcpu_next_unpop((bitmap), &(rs), &(re), (end)); \ |
| 275 | (rs) < (re); \ |
| 276 | (rs) = (re) + 1, pcpu_next_unpop((bitmap), &(rs), &(re), (end))) |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 277 | |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 278 | #define pcpu_for_each_pop_region(bitmap, rs, re, start, end) \ |
| 279 | for ((rs) = (start), pcpu_next_pop((bitmap), &(rs), &(re), (end)); \ |
| 280 | (rs) < (re); \ |
| 281 | (rs) = (re) + 1, pcpu_next_pop((bitmap), &(rs), &(re), (end))) |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 282 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 283 | /** |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 284 | * pcpu_mem_zalloc - allocate memory |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 285 | * @size: bytes to allocate |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 286 | * |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 287 | * Allocate @size bytes. If @size is smaller than PAGE_SIZE, |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 288 | * kzalloc() is used; otherwise, vzalloc() is used. The returned |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 289 | * memory is always zeroed. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 290 | * |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 291 | * CONTEXT: |
| 292 | * Does GFP_KERNEL allocation. |
| 293 | * |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 294 | * RETURNS: |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 295 | * Pointer to the allocated area on success, NULL on failure. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 296 | */ |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 297 | static void *pcpu_mem_zalloc(size_t size) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 298 | { |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 299 | if (WARN_ON_ONCE(!slab_is_available())) |
| 300 | return NULL; |
| 301 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 302 | if (size <= PAGE_SIZE) |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 303 | return kzalloc(size, GFP_KERNEL); |
Jesper Juhl | 7af4c09 | 2010-10-30 15:56:54 +0200 | [diff] [blame] | 304 | else |
| 305 | return vzalloc(size); |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 306 | } |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 307 | |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 308 | /** |
| 309 | * pcpu_mem_free - free memory |
| 310 | * @ptr: memory to free |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 311 | * |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 312 | * Free @ptr. @ptr should have been allocated using pcpu_mem_zalloc(). |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 313 | */ |
Tetsuo Handa | 1d5cfdb | 2016-01-22 15:11:02 -0800 | [diff] [blame] | 314 | static void pcpu_mem_free(void *ptr) |
Tejun Heo | 1880d93 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 315 | { |
Tetsuo Handa | 1d5cfdb | 2016-01-22 15:11:02 -0800 | [diff] [blame] | 316 | kvfree(ptr); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | /** |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 320 | * pcpu_count_occupied_pages - count the number of pages an area occupies |
| 321 | * @chunk: chunk of interest |
| 322 | * @i: index of the area in question |
| 323 | * |
| 324 | * Count the number of pages chunk's @i'th area occupies. When the area's |
| 325 | * start and/or end address isn't aligned to page boundary, the straddled |
| 326 | * page is included in the count iff the rest of the page is free. |
| 327 | */ |
| 328 | static int pcpu_count_occupied_pages(struct pcpu_chunk *chunk, int i) |
| 329 | { |
| 330 | int off = chunk->map[i] & ~1; |
| 331 | int end = chunk->map[i + 1] & ~1; |
| 332 | |
| 333 | if (!PAGE_ALIGNED(off) && i > 0) { |
| 334 | int prev = chunk->map[i - 1]; |
| 335 | |
| 336 | if (!(prev & 1) && prev <= round_down(off, PAGE_SIZE)) |
| 337 | off = round_down(off, PAGE_SIZE); |
| 338 | } |
| 339 | |
| 340 | if (!PAGE_ALIGNED(end) && i + 1 < chunk->map_used) { |
| 341 | int next = chunk->map[i + 1]; |
| 342 | int nend = chunk->map[i + 2] & ~1; |
| 343 | |
| 344 | if (!(next & 1) && nend >= round_up(end, PAGE_SIZE)) |
| 345 | end = round_up(end, PAGE_SIZE); |
| 346 | } |
| 347 | |
| 348 | return max_t(int, PFN_DOWN(end) - PFN_UP(off), 0); |
| 349 | } |
| 350 | |
| 351 | /** |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 352 | * pcpu_chunk_relocate - put chunk in the appropriate chunk slot |
| 353 | * @chunk: chunk of interest |
| 354 | * @oslot: the previous slot it was on |
| 355 | * |
| 356 | * This function is called after an allocation or free changed @chunk. |
| 357 | * New slot according to the changed state is determined and @chunk is |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 358 | * moved to the slot. Note that the reserved chunk is never put on |
| 359 | * chunk slots. |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 360 | * |
| 361 | * CONTEXT: |
| 362 | * pcpu_lock. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 363 | */ |
| 364 | static void pcpu_chunk_relocate(struct pcpu_chunk *chunk, int oslot) |
| 365 | { |
| 366 | int nslot = pcpu_chunk_slot(chunk); |
| 367 | |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 368 | if (chunk != pcpu_reserved_chunk && oslot != nslot) { |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 369 | if (oslot < nslot) |
| 370 | list_move(&chunk->list, &pcpu_slot[nslot]); |
| 371 | else |
| 372 | list_move_tail(&chunk->list, &pcpu_slot[nslot]); |
| 373 | } |
| 374 | } |
| 375 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 376 | /** |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 377 | * pcpu_need_to_extend - determine whether chunk area map needs to be extended |
| 378 | * @chunk: chunk of interest |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 379 | * @is_atomic: the allocation context |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 380 | * |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 381 | * Determine whether area map of @chunk needs to be extended. If |
| 382 | * @is_atomic, only the amount necessary for a new allocation is |
| 383 | * considered; however, async extension is scheduled if the left amount is |
| 384 | * low. If !@is_atomic, it aims for more empty space. Combined, this |
| 385 | * ensures that the map is likely to have enough available space to |
| 386 | * accomodate atomic allocations which can't extend maps directly. |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 387 | * |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 388 | * CONTEXT: |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 389 | * pcpu_lock. |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 390 | * |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 391 | * RETURNS: |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 392 | * New target map allocation length if extension is necessary, 0 |
| 393 | * otherwise. |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 394 | */ |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 395 | static int pcpu_need_to_extend(struct pcpu_chunk *chunk, bool is_atomic) |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 396 | { |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 397 | int margin, new_alloc; |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 398 | |
Tejun Heo | 4f996e2 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 399 | lockdep_assert_held(&pcpu_lock); |
| 400 | |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 401 | if (is_atomic) { |
| 402 | margin = 3; |
| 403 | |
| 404 | if (chunk->map_alloc < |
Tejun Heo | 4f996e2 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 405 | chunk->map_used + PCPU_ATOMIC_MAP_MARGIN_LOW) { |
| 406 | if (list_empty(&chunk->map_extend_list)) { |
| 407 | list_add_tail(&chunk->map_extend_list, |
| 408 | &pcpu_map_extend_chunks); |
| 409 | pcpu_schedule_balance_work(); |
| 410 | } |
| 411 | } |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 412 | } else { |
| 413 | margin = PCPU_ATOMIC_MAP_MARGIN_HIGH; |
| 414 | } |
| 415 | |
| 416 | if (chunk->map_alloc >= chunk->map_used + margin) |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 417 | return 0; |
| 418 | |
| 419 | new_alloc = PCPU_DFL_MAP_ALLOC; |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 420 | while (new_alloc < chunk->map_used + margin) |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 421 | new_alloc *= 2; |
| 422 | |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 423 | return new_alloc; |
| 424 | } |
| 425 | |
| 426 | /** |
| 427 | * pcpu_extend_area_map - extend area map of a chunk |
| 428 | * @chunk: chunk of interest |
| 429 | * @new_alloc: new target allocation length of the area map |
| 430 | * |
| 431 | * Extend area map of @chunk to have @new_alloc entries. |
| 432 | * |
| 433 | * CONTEXT: |
| 434 | * Does GFP_KERNEL allocation. Grabs and releases pcpu_lock. |
| 435 | * |
| 436 | * RETURNS: |
| 437 | * 0 on success, -errno on failure. |
| 438 | */ |
| 439 | static int pcpu_extend_area_map(struct pcpu_chunk *chunk, int new_alloc) |
| 440 | { |
| 441 | int *old = NULL, *new = NULL; |
| 442 | size_t old_size = 0, new_size = new_alloc * sizeof(new[0]); |
| 443 | unsigned long flags; |
| 444 | |
Tejun Heo | 6710e59 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 445 | lockdep_assert_held(&pcpu_alloc_mutex); |
| 446 | |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 447 | new = pcpu_mem_zalloc(new_size); |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 448 | if (!new) |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 449 | return -ENOMEM; |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 450 | |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 451 | /* acquire pcpu_lock and switch to new area map */ |
| 452 | spin_lock_irqsave(&pcpu_lock, flags); |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 453 | |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 454 | if (new_alloc <= chunk->map_alloc) |
| 455 | goto out_unlock; |
| 456 | |
| 457 | old_size = chunk->map_alloc * sizeof(chunk->map[0]); |
Huang Shijie | a002d14 | 2010-08-08 14:39:07 +0200 | [diff] [blame] | 458 | old = chunk->map; |
| 459 | |
| 460 | memcpy(new, old, old_size); |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 461 | |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 462 | chunk->map_alloc = new_alloc; |
| 463 | chunk->map = new; |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 464 | new = NULL; |
| 465 | |
| 466 | out_unlock: |
| 467 | spin_unlock_irqrestore(&pcpu_lock, flags); |
| 468 | |
| 469 | /* |
| 470 | * pcpu_mem_free() might end up calling vfree() which uses |
| 471 | * IRQ-unsafe lock and thus can't be called under pcpu_lock. |
| 472 | */ |
Tetsuo Handa | 1d5cfdb | 2016-01-22 15:11:02 -0800 | [diff] [blame] | 473 | pcpu_mem_free(old); |
| 474 | pcpu_mem_free(new); |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 475 | |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 476 | return 0; |
| 477 | } |
| 478 | |
| 479 | /** |
Tejun Heo | a16037c | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 480 | * pcpu_fit_in_area - try to fit the requested allocation in a candidate area |
| 481 | * @chunk: chunk the candidate area belongs to |
| 482 | * @off: the offset to the start of the candidate area |
| 483 | * @this_size: the size of the candidate area |
| 484 | * @size: the size of the target allocation |
| 485 | * @align: the alignment of the target allocation |
| 486 | * @pop_only: only allocate from already populated region |
| 487 | * |
| 488 | * We're trying to allocate @size bytes aligned at @align. @chunk's area |
| 489 | * at @off sized @this_size is a candidate. This function determines |
| 490 | * whether the target allocation fits in the candidate area and returns the |
| 491 | * number of bytes to pad after @off. If the target area doesn't fit, -1 |
| 492 | * is returned. |
| 493 | * |
| 494 | * If @pop_only is %true, this function only considers the already |
| 495 | * populated part of the candidate area. |
| 496 | */ |
| 497 | static int pcpu_fit_in_area(struct pcpu_chunk *chunk, int off, int this_size, |
| 498 | int size, int align, bool pop_only) |
| 499 | { |
| 500 | int cand_off = off; |
| 501 | |
| 502 | while (true) { |
| 503 | int head = ALIGN(cand_off, align) - off; |
| 504 | int page_start, page_end, rs, re; |
| 505 | |
| 506 | if (this_size < head + size) |
| 507 | return -1; |
| 508 | |
| 509 | if (!pop_only) |
| 510 | return head; |
| 511 | |
| 512 | /* |
| 513 | * If the first unpopulated page is beyond the end of the |
| 514 | * allocation, the whole allocation is populated; |
| 515 | * otherwise, retry from the end of the unpopulated area. |
| 516 | */ |
| 517 | page_start = PFN_DOWN(head + off); |
| 518 | page_end = PFN_UP(head + off + size); |
| 519 | |
| 520 | rs = page_start; |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 521 | pcpu_next_unpop(chunk->populated, &rs, &re, |
| 522 | PFN_UP(off + this_size)); |
Tejun Heo | a16037c | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 523 | if (rs >= page_end) |
| 524 | return head; |
| 525 | cand_off = re * PAGE_SIZE; |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | /** |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 530 | * pcpu_alloc_area - allocate area from a pcpu_chunk |
| 531 | * @chunk: chunk of interest |
Tejun Heo | cae3aeb | 2009-02-21 16:56:23 +0900 | [diff] [blame] | 532 | * @size: wanted size in bytes |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 533 | * @align: wanted align |
Tejun Heo | a16037c | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 534 | * @pop_only: allocate only from the populated area |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 535 | * @occ_pages_p: out param for the number of pages the area occupies |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 536 | * |
| 537 | * Try to allocate @size bytes area aligned at @align from @chunk. |
| 538 | * Note that this function only allocates the offset. It doesn't |
| 539 | * populate or map the area. |
| 540 | * |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 541 | * @chunk->map must have at least two free slots. |
| 542 | * |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 543 | * CONTEXT: |
| 544 | * pcpu_lock. |
| 545 | * |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 546 | * RETURNS: |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 547 | * Allocated offset in @chunk on success, -1 if no matching area is |
| 548 | * found. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 549 | */ |
Tejun Heo | a16037c | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 550 | static int pcpu_alloc_area(struct pcpu_chunk *chunk, int size, int align, |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 551 | bool pop_only, int *occ_pages_p) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 552 | { |
| 553 | int oslot = pcpu_chunk_slot(chunk); |
| 554 | int max_contig = 0; |
| 555 | int i, off; |
Al Viro | 3d331ad | 2014-03-06 20:52:32 -0500 | [diff] [blame] | 556 | bool seen_free = false; |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 557 | int *p; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 558 | |
Al Viro | 3d331ad | 2014-03-06 20:52:32 -0500 | [diff] [blame] | 559 | for (i = chunk->first_free, p = chunk->map + i; i < chunk->map_used; i++, p++) { |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 560 | int head, tail; |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 561 | int this_size; |
| 562 | |
| 563 | off = *p; |
| 564 | if (off & 1) |
| 565 | continue; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 566 | |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 567 | this_size = (p[1] & ~1) - off; |
Tejun Heo | a16037c | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 568 | |
| 569 | head = pcpu_fit_in_area(chunk, off, this_size, size, align, |
| 570 | pop_only); |
| 571 | if (head < 0) { |
Al Viro | 3d331ad | 2014-03-06 20:52:32 -0500 | [diff] [blame] | 572 | if (!seen_free) { |
| 573 | chunk->first_free = i; |
| 574 | seen_free = true; |
| 575 | } |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 576 | max_contig = max(this_size, max_contig); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 577 | continue; |
| 578 | } |
| 579 | |
| 580 | /* |
| 581 | * If head is small or the previous block is free, |
| 582 | * merge'em. Note that 'small' is defined as smaller |
| 583 | * than sizeof(int), which is very small but isn't too |
| 584 | * uncommon for percpu allocations. |
| 585 | */ |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 586 | if (head && (head < sizeof(int) || !(p[-1] & 1))) { |
Jianyu Zhan | 21ddfd3 | 2014-03-28 20:55:21 +0800 | [diff] [blame] | 587 | *p = off += head; |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 588 | if (p[-1] & 1) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 589 | chunk->free_size -= head; |
Jianyu Zhan | 21ddfd3 | 2014-03-28 20:55:21 +0800 | [diff] [blame] | 590 | else |
| 591 | max_contig = max(*p - p[-1], max_contig); |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 592 | this_size -= head; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 593 | head = 0; |
| 594 | } |
| 595 | |
| 596 | /* if tail is small, just keep it around */ |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 597 | tail = this_size - head - size; |
| 598 | if (tail < sizeof(int)) { |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 599 | tail = 0; |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 600 | size = this_size - head; |
| 601 | } |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 602 | |
| 603 | /* split if warranted */ |
| 604 | if (head || tail) { |
Al Viro | 706c16f | 2014-03-06 21:08:24 -0500 | [diff] [blame] | 605 | int nr_extra = !!head + !!tail; |
| 606 | |
| 607 | /* insert new subblocks */ |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 608 | memmove(p + nr_extra + 1, p + 1, |
Al Viro | 706c16f | 2014-03-06 21:08:24 -0500 | [diff] [blame] | 609 | sizeof(chunk->map[0]) * (chunk->map_used - i)); |
| 610 | chunk->map_used += nr_extra; |
| 611 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 612 | if (head) { |
Al Viro | 3d331ad | 2014-03-06 20:52:32 -0500 | [diff] [blame] | 613 | if (!seen_free) { |
| 614 | chunk->first_free = i; |
| 615 | seen_free = true; |
| 616 | } |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 617 | *++p = off += head; |
| 618 | ++i; |
Al Viro | 706c16f | 2014-03-06 21:08:24 -0500 | [diff] [blame] | 619 | max_contig = max(head, max_contig); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 620 | } |
Al Viro | 706c16f | 2014-03-06 21:08:24 -0500 | [diff] [blame] | 621 | if (tail) { |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 622 | p[1] = off + size; |
Al Viro | 706c16f | 2014-03-06 21:08:24 -0500 | [diff] [blame] | 623 | max_contig = max(tail, max_contig); |
| 624 | } |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 625 | } |
| 626 | |
Al Viro | 3d331ad | 2014-03-06 20:52:32 -0500 | [diff] [blame] | 627 | if (!seen_free) |
| 628 | chunk->first_free = i + 1; |
| 629 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 630 | /* update hint and mark allocated */ |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 631 | if (i + 1 == chunk->map_used) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 632 | chunk->contig_hint = max_contig; /* fully scanned */ |
| 633 | else |
| 634 | chunk->contig_hint = max(chunk->contig_hint, |
| 635 | max_contig); |
| 636 | |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 637 | chunk->free_size -= size; |
| 638 | *p |= 1; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 639 | |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 640 | *occ_pages_p = pcpu_count_occupied_pages(chunk, i); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 641 | pcpu_chunk_relocate(chunk, oslot); |
| 642 | return off; |
| 643 | } |
| 644 | |
| 645 | chunk->contig_hint = max_contig; /* fully scanned */ |
| 646 | pcpu_chunk_relocate(chunk, oslot); |
| 647 | |
Tejun Heo | 9f7dcf2 | 2009-03-07 00:44:09 +0900 | [diff] [blame] | 648 | /* tell the upper layer that this chunk has no matching area */ |
| 649 | return -1; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | /** |
| 653 | * pcpu_free_area - free area to a pcpu_chunk |
| 654 | * @chunk: chunk of interest |
| 655 | * @freeme: offset of area to free |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 656 | * @occ_pages_p: out param for the number of pages the area occupies |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 657 | * |
| 658 | * Free area starting from @freeme to @chunk. Note that this function |
| 659 | * only modifies the allocation map. It doesn't depopulate or unmap |
| 660 | * the area. |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 661 | * |
| 662 | * CONTEXT: |
| 663 | * pcpu_lock. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 664 | */ |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 665 | static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme, |
| 666 | int *occ_pages_p) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 667 | { |
| 668 | int oslot = pcpu_chunk_slot(chunk); |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 669 | int off = 0; |
| 670 | unsigned i, j; |
| 671 | int to_free = 0; |
| 672 | int *p; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 673 | |
Dennis Zhou | 5ccd30e | 2017-06-19 19:28:29 -0400 | [diff] [blame] | 674 | lockdep_assert_held(&pcpu_lock); |
Dennis Zhou | 30a5b53 | 2017-06-19 19:28:31 -0400 | [diff] [blame] | 675 | pcpu_stats_area_dealloc(chunk); |
Dennis Zhou | 5ccd30e | 2017-06-19 19:28:29 -0400 | [diff] [blame] | 676 | |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 677 | freeme |= 1; /* we are searching for <given offset, in use> pair */ |
| 678 | |
| 679 | i = 0; |
| 680 | j = chunk->map_used; |
| 681 | while (i != j) { |
| 682 | unsigned k = (i + j) / 2; |
| 683 | off = chunk->map[k]; |
| 684 | if (off < freeme) |
| 685 | i = k + 1; |
| 686 | else if (off > freeme) |
| 687 | j = k; |
| 688 | else |
| 689 | i = j = k; |
| 690 | } |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 691 | BUG_ON(off != freeme); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 692 | |
Al Viro | 3d331ad | 2014-03-06 20:52:32 -0500 | [diff] [blame] | 693 | if (i < chunk->first_free) |
| 694 | chunk->first_free = i; |
| 695 | |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 696 | p = chunk->map + i; |
| 697 | *p = off &= ~1; |
| 698 | chunk->free_size += (p[1] & ~1) - off; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 699 | |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 700 | *occ_pages_p = pcpu_count_occupied_pages(chunk, i); |
| 701 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 702 | /* merge with next? */ |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 703 | if (!(p[1] & 1)) |
| 704 | to_free++; |
| 705 | /* merge with previous? */ |
| 706 | if (i > 0 && !(p[-1] & 1)) { |
| 707 | to_free++; |
| 708 | i--; |
| 709 | p--; |
| 710 | } |
| 711 | if (to_free) { |
| 712 | chunk->map_used -= to_free; |
| 713 | memmove(p + 1, p + 1 + to_free, |
| 714 | (chunk->map_used - i) * sizeof(chunk->map[0])); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 715 | } |
| 716 | |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 717 | chunk->contig_hint = max(chunk->map[i + 1] - chunk->map[i] - 1, chunk->contig_hint); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 718 | pcpu_chunk_relocate(chunk, oslot); |
| 719 | } |
| 720 | |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 721 | static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr, |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 722 | int map_size, |
| 723 | int *map, |
| 724 | int init_map_size) |
| 725 | { |
| 726 | struct pcpu_chunk *chunk; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 727 | unsigned long aligned_addr; |
| 728 | int start_offset, region_size; |
| 729 | |
| 730 | /* region calculations */ |
| 731 | aligned_addr = tmp_addr & PAGE_MASK; |
| 732 | |
| 733 | start_offset = tmp_addr - aligned_addr; |
Dennis Zhou (Facebook) | 6b9d7c8 | 2017-07-24 19:02:03 -0400 | [diff] [blame] | 734 | |
| 735 | region_size = PFN_ALIGN(start_offset + map_size); |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 736 | |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 737 | /* allocate chunk */ |
Dennis Zhou (Facebook) | 8ab16c4 | 2017-07-24 19:02:07 -0400 | [diff] [blame] | 738 | chunk = memblock_virt_alloc(sizeof(struct pcpu_chunk) + |
| 739 | BITS_TO_LONGS(region_size >> PAGE_SHIFT), |
| 740 | 0); |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 741 | |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 742 | INIT_LIST_HEAD(&chunk->list); |
| 743 | INIT_LIST_HEAD(&chunk->map_extend_list); |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 744 | |
| 745 | chunk->base_addr = (void *)aligned_addr; |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 746 | chunk->start_offset = start_offset; |
Dennis Zhou (Facebook) | 6b9d7c8 | 2017-07-24 19:02:03 -0400 | [diff] [blame] | 747 | chunk->end_offset = region_size - chunk->start_offset - map_size; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 748 | |
Dennis Zhou (Facebook) | 8ab16c4 | 2017-07-24 19:02:07 -0400 | [diff] [blame] | 749 | chunk->nr_pages = region_size >> PAGE_SHIFT; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 750 | |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 751 | chunk->map = map; |
| 752 | chunk->map_alloc = init_map_size; |
| 753 | |
| 754 | /* manage populated page bitmap */ |
| 755 | chunk->immutable = true; |
Dennis Zhou (Facebook) | 8ab16c4 | 2017-07-24 19:02:07 -0400 | [diff] [blame] | 756 | bitmap_fill(chunk->populated, chunk->nr_pages); |
| 757 | chunk->nr_populated = chunk->nr_pages; |
Dennis Zhou (Facebook) | 0cecf50 | 2017-07-24 19:02:08 -0400 | [diff] [blame] | 758 | chunk->nr_empty_pop_pages = chunk->nr_pages; |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 759 | |
| 760 | chunk->contig_hint = chunk->free_size = map_size; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 761 | |
| 762 | if (chunk->start_offset) { |
| 763 | /* hide the beginning of the bitmap */ |
Dennis Zhou (Facebook) | 0cecf50 | 2017-07-24 19:02:08 -0400 | [diff] [blame] | 764 | chunk->nr_empty_pop_pages--; |
| 765 | |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 766 | chunk->map[0] = 1; |
| 767 | chunk->map[1] = chunk->start_offset; |
| 768 | chunk->map_used = 1; |
| 769 | } |
| 770 | |
| 771 | /* set chunk's free region */ |
| 772 | chunk->map[++chunk->map_used] = |
| 773 | (chunk->start_offset + chunk->free_size) | 1; |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 774 | |
Dennis Zhou (Facebook) | 6b9d7c8 | 2017-07-24 19:02:03 -0400 | [diff] [blame] | 775 | if (chunk->end_offset) { |
| 776 | /* hide the end of the bitmap */ |
Dennis Zhou (Facebook) | 0cecf50 | 2017-07-24 19:02:08 -0400 | [diff] [blame] | 777 | chunk->nr_empty_pop_pages--; |
| 778 | |
Dennis Zhou (Facebook) | 6b9d7c8 | 2017-07-24 19:02:03 -0400 | [diff] [blame] | 779 | chunk->map[++chunk->map_used] = region_size | 1; |
| 780 | } |
| 781 | |
Dennis Zhou (Facebook) | 10edf5b | 2017-07-24 19:02:02 -0400 | [diff] [blame] | 782 | return chunk; |
| 783 | } |
| 784 | |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 785 | static struct pcpu_chunk *pcpu_alloc_chunk(void) |
| 786 | { |
| 787 | struct pcpu_chunk *chunk; |
| 788 | |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 789 | chunk = pcpu_mem_zalloc(pcpu_chunk_struct_size); |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 790 | if (!chunk) |
| 791 | return NULL; |
| 792 | |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 793 | chunk->map = pcpu_mem_zalloc(PCPU_DFL_MAP_ALLOC * |
| 794 | sizeof(chunk->map[0])); |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 795 | if (!chunk->map) { |
Tetsuo Handa | 1d5cfdb | 2016-01-22 15:11:02 -0800 | [diff] [blame] | 796 | pcpu_mem_free(chunk); |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 797 | return NULL; |
| 798 | } |
| 799 | |
| 800 | chunk->map_alloc = PCPU_DFL_MAP_ALLOC; |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 801 | chunk->map[0] = 0; |
| 802 | chunk->map[1] = pcpu_unit_size | 1; |
| 803 | chunk->map_used = 1; |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 804 | |
| 805 | INIT_LIST_HEAD(&chunk->list); |
Tejun Heo | 4f996e2 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 806 | INIT_LIST_HEAD(&chunk->map_extend_list); |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 807 | chunk->free_size = pcpu_unit_size; |
| 808 | chunk->contig_hint = pcpu_unit_size; |
| 809 | |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 810 | chunk->nr_pages = pcpu_unit_pages; |
| 811 | |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 812 | return chunk; |
| 813 | } |
| 814 | |
| 815 | static void pcpu_free_chunk(struct pcpu_chunk *chunk) |
| 816 | { |
| 817 | if (!chunk) |
| 818 | return; |
Tetsuo Handa | 1d5cfdb | 2016-01-22 15:11:02 -0800 | [diff] [blame] | 819 | pcpu_mem_free(chunk->map); |
| 820 | pcpu_mem_free(chunk); |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 821 | } |
| 822 | |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 823 | /** |
| 824 | * pcpu_chunk_populated - post-population bookkeeping |
| 825 | * @chunk: pcpu_chunk which got populated |
| 826 | * @page_start: the start page |
| 827 | * @page_end: the end page |
| 828 | * |
| 829 | * Pages in [@page_start,@page_end) have been populated to @chunk. Update |
| 830 | * the bookkeeping information accordingly. Must be called after each |
| 831 | * successful population. |
| 832 | */ |
| 833 | static void pcpu_chunk_populated(struct pcpu_chunk *chunk, |
| 834 | int page_start, int page_end) |
| 835 | { |
| 836 | int nr = page_end - page_start; |
| 837 | |
| 838 | lockdep_assert_held(&pcpu_lock); |
| 839 | |
| 840 | bitmap_set(chunk->populated, page_start, nr); |
| 841 | chunk->nr_populated += nr; |
Dennis Zhou (Facebook) | 0cecf50 | 2017-07-24 19:02:08 -0400 | [diff] [blame] | 842 | chunk->nr_empty_pop_pages += nr; |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 843 | pcpu_nr_empty_pop_pages += nr; |
| 844 | } |
| 845 | |
| 846 | /** |
| 847 | * pcpu_chunk_depopulated - post-depopulation bookkeeping |
| 848 | * @chunk: pcpu_chunk which got depopulated |
| 849 | * @page_start: the start page |
| 850 | * @page_end: the end page |
| 851 | * |
| 852 | * Pages in [@page_start,@page_end) have been depopulated from @chunk. |
| 853 | * Update the bookkeeping information accordingly. Must be called after |
| 854 | * each successful depopulation. |
| 855 | */ |
| 856 | static void pcpu_chunk_depopulated(struct pcpu_chunk *chunk, |
| 857 | int page_start, int page_end) |
| 858 | { |
| 859 | int nr = page_end - page_start; |
| 860 | |
| 861 | lockdep_assert_held(&pcpu_lock); |
| 862 | |
| 863 | bitmap_clear(chunk->populated, page_start, nr); |
| 864 | chunk->nr_populated -= nr; |
Dennis Zhou (Facebook) | 0cecf50 | 2017-07-24 19:02:08 -0400 | [diff] [blame] | 865 | chunk->nr_empty_pop_pages -= nr; |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 866 | pcpu_nr_empty_pop_pages -= nr; |
| 867 | } |
| 868 | |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 869 | /* |
| 870 | * Chunk management implementation. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 871 | * |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 872 | * To allow different implementations, chunk alloc/free and |
| 873 | * [de]population are implemented in a separate file which is pulled |
| 874 | * into this file and compiled together. The following functions |
| 875 | * should be implemented. |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 876 | * |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 877 | * pcpu_populate_chunk - populate the specified range of a chunk |
| 878 | * pcpu_depopulate_chunk - depopulate the specified range of a chunk |
| 879 | * pcpu_create_chunk - create a new chunk |
| 880 | * pcpu_destroy_chunk - destroy a chunk, always preceded by full depop |
| 881 | * pcpu_addr_to_page - translate address to physical address |
| 882 | * pcpu_verify_alloc_info - check alloc_info is acceptable during init |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 883 | */ |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 884 | static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size); |
| 885 | static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size); |
| 886 | static struct pcpu_chunk *pcpu_create_chunk(void); |
| 887 | static void pcpu_destroy_chunk(struct pcpu_chunk *chunk); |
| 888 | static struct page *pcpu_addr_to_page(void *addr); |
| 889 | static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai); |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 890 | |
Tejun Heo | b0c9778 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 891 | #ifdef CONFIG_NEED_PER_CPU_KM |
| 892 | #include "percpu-km.c" |
| 893 | #else |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 894 | #include "percpu-vm.c" |
Tejun Heo | b0c9778 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 895 | #endif |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 896 | |
| 897 | /** |
Tejun Heo | 88999a8 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 898 | * pcpu_chunk_addr_search - determine chunk containing specified address |
| 899 | * @addr: address for which the chunk needs to be determined. |
| 900 | * |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 901 | * This is an internal function that handles all but static allocations. |
| 902 | * Static percpu address values should never be passed into the allocator. |
| 903 | * |
Tejun Heo | 88999a8 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 904 | * RETURNS: |
| 905 | * The address of the found chunk. |
| 906 | */ |
| 907 | static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr) |
| 908 | { |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 909 | /* is it in the dynamic region (first chunk)? */ |
Dennis Zhou (Facebook) | 560f2c2 | 2017-07-24 19:02:06 -0400 | [diff] [blame] | 910 | if (pcpu_addr_in_chunk(pcpu_first_chunk, addr)) |
Tejun Heo | 88999a8 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 911 | return pcpu_first_chunk; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 912 | |
| 913 | /* is it in the reserved region? */ |
Dennis Zhou (Facebook) | 560f2c2 | 2017-07-24 19:02:06 -0400 | [diff] [blame] | 914 | if (pcpu_addr_in_chunk(pcpu_reserved_chunk, addr)) |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 915 | return pcpu_reserved_chunk; |
Tejun Heo | 88999a8 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 916 | |
| 917 | /* |
| 918 | * The address is relative to unit0 which might be unused and |
| 919 | * thus unmapped. Offset the address to the unit space of the |
| 920 | * current processor before looking it up in the vmalloc |
| 921 | * space. Note that any possible cpu id can be used here, so |
| 922 | * there's no need to worry about preemption or cpu hotplug. |
| 923 | */ |
| 924 | addr += pcpu_unit_offsets[raw_smp_processor_id()]; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 925 | return pcpu_get_page_chunk(pcpu_addr_to_page(addr)); |
Tejun Heo | 88999a8 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 926 | } |
| 927 | |
| 928 | /** |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 929 | * pcpu_alloc - the percpu allocator |
Tejun Heo | cae3aeb | 2009-02-21 16:56:23 +0900 | [diff] [blame] | 930 | * @size: size of area to allocate in bytes |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 931 | * @align: alignment of area (max PAGE_SIZE) |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 932 | * @reserved: allocate from the reserved chunk if available |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 933 | * @gfp: allocation flags |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 934 | * |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 935 | * Allocate percpu area of @size bytes aligned at @align. If @gfp doesn't |
| 936 | * contain %GFP_KERNEL, the allocation is atomic. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 937 | * |
| 938 | * RETURNS: |
| 939 | * Percpu pointer to the allocated area on success, NULL on failure. |
| 940 | */ |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 941 | static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved, |
| 942 | gfp_t gfp) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 943 | { |
Tejun Heo | f2badb0 | 2009-09-29 09:17:58 +0900 | [diff] [blame] | 944 | static int warn_limit = 10; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 945 | struct pcpu_chunk *chunk; |
Tejun Heo | f2badb0 | 2009-09-29 09:17:58 +0900 | [diff] [blame] | 946 | const char *err; |
Tejun Heo | 6ae833c7f | 2014-10-08 12:01:52 -0400 | [diff] [blame] | 947 | bool is_atomic = (gfp & GFP_KERNEL) != GFP_KERNEL; |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 948 | int occ_pages = 0; |
Tejun Heo | b38d08f | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 949 | int slot, off, new_alloc, cpu, ret; |
Jiri Kosina | 403a91b | 2009-10-29 00:25:59 +0900 | [diff] [blame] | 950 | unsigned long flags; |
Catalin Marinas | f528f0b | 2011-09-26 17:12:53 +0100 | [diff] [blame] | 951 | void __percpu *ptr; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 952 | |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 953 | /* |
| 954 | * We want the lowest bit of offset available for in-use/free |
Viro | 2f69fa8 | 2014-03-17 16:01:27 -0400 | [diff] [blame] | 955 | * indicator, so force >= 16bit alignment and make size even. |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 956 | */ |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 957 | if (unlikely(align < PCPU_MIN_ALLOC_SIZE)) |
| 958 | align = PCPU_MIN_ALLOC_SIZE; |
Al Viro | 723ad1d | 2014-03-06 21:13:18 -0500 | [diff] [blame] | 959 | |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 960 | size = ALIGN(size, PCPU_MIN_ALLOC_SIZE); |
Viro | 2f69fa8 | 2014-03-17 16:01:27 -0400 | [diff] [blame] | 961 | |
zijun_hu | 3ca45a4 | 2016-10-14 15:12:54 +0800 | [diff] [blame] | 962 | if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE || |
| 963 | !is_power_of_2(align))) { |
Joe Perches | 756a025 | 2016-03-17 14:19:47 -0700 | [diff] [blame] | 964 | WARN(true, "illegal size (%zu) or align (%zu) for percpu allocation\n", |
| 965 | size, align); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 966 | return NULL; |
| 967 | } |
| 968 | |
Tejun Heo | 6710e59 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 969 | if (!is_atomic) |
| 970 | mutex_lock(&pcpu_alloc_mutex); |
| 971 | |
Jiri Kosina | 403a91b | 2009-10-29 00:25:59 +0900 | [diff] [blame] | 972 | spin_lock_irqsave(&pcpu_lock, flags); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 973 | |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 974 | /* serve reserved allocations from the reserved chunk if available */ |
| 975 | if (reserved && pcpu_reserved_chunk) { |
| 976 | chunk = pcpu_reserved_chunk; |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 977 | |
| 978 | if (size > chunk->contig_hint) { |
| 979 | err = "alloc from reserved chunk failed"; |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 980 | goto fail_unlock; |
Tejun Heo | f2badb0 | 2009-09-29 09:17:58 +0900 | [diff] [blame] | 981 | } |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 982 | |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 983 | while ((new_alloc = pcpu_need_to_extend(chunk, is_atomic))) { |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 984 | spin_unlock_irqrestore(&pcpu_lock, flags); |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 985 | if (is_atomic || |
| 986 | pcpu_extend_area_map(chunk, new_alloc) < 0) { |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 987 | err = "failed to extend area map of reserved chunk"; |
Tejun Heo | b38d08f | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 988 | goto fail; |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 989 | } |
| 990 | spin_lock_irqsave(&pcpu_lock, flags); |
| 991 | } |
| 992 | |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 993 | off = pcpu_alloc_area(chunk, size, align, is_atomic, |
| 994 | &occ_pages); |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 995 | if (off >= 0) |
| 996 | goto area_found; |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 997 | |
Tejun Heo | f2badb0 | 2009-09-29 09:17:58 +0900 | [diff] [blame] | 998 | err = "alloc from reserved chunk failed"; |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 999 | goto fail_unlock; |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1000 | } |
| 1001 | |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1002 | restart: |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1003 | /* search through normal chunks */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1004 | for (slot = pcpu_size_to_slot(size); slot < pcpu_nr_slots; slot++) { |
| 1005 | list_for_each_entry(chunk, &pcpu_slot[slot], list) { |
| 1006 | if (size > chunk->contig_hint) |
| 1007 | continue; |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1008 | |
Tejun Heo | 9c824b6 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1009 | new_alloc = pcpu_need_to_extend(chunk, is_atomic); |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 1010 | if (new_alloc) { |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1011 | if (is_atomic) |
| 1012 | continue; |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 1013 | spin_unlock_irqrestore(&pcpu_lock, flags); |
| 1014 | if (pcpu_extend_area_map(chunk, |
| 1015 | new_alloc) < 0) { |
| 1016 | err = "failed to extend area map"; |
Tejun Heo | b38d08f | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1017 | goto fail; |
Tejun Heo | 833af84 | 2009-11-11 15:35:18 +0900 | [diff] [blame] | 1018 | } |
| 1019 | spin_lock_irqsave(&pcpu_lock, flags); |
| 1020 | /* |
| 1021 | * pcpu_lock has been dropped, need to |
| 1022 | * restart cpu_slot list walking. |
| 1023 | */ |
| 1024 | goto restart; |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1025 | } |
| 1026 | |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1027 | off = pcpu_alloc_area(chunk, size, align, is_atomic, |
| 1028 | &occ_pages); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1029 | if (off >= 0) |
| 1030 | goto area_found; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1031 | } |
| 1032 | } |
| 1033 | |
Jiri Kosina | 403a91b | 2009-10-29 00:25:59 +0900 | [diff] [blame] | 1034 | spin_unlock_irqrestore(&pcpu_lock, flags); |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1035 | |
Tejun Heo | b38d08f | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1036 | /* |
| 1037 | * No space left. Create a new chunk. We don't want multiple |
| 1038 | * tasks to create chunks simultaneously. Serialize and create iff |
| 1039 | * there's still no empty chunk after grabbing the mutex. |
| 1040 | */ |
Dennis Zhou | 11df02b | 2017-06-21 11:51:09 -0400 | [diff] [blame] | 1041 | if (is_atomic) { |
| 1042 | err = "atomic alloc failed, no space left"; |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1043 | goto fail; |
Dennis Zhou | 11df02b | 2017-06-21 11:51:09 -0400 | [diff] [blame] | 1044 | } |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1045 | |
Tejun Heo | b38d08f | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1046 | if (list_empty(&pcpu_slot[pcpu_nr_slots - 1])) { |
| 1047 | chunk = pcpu_create_chunk(); |
| 1048 | if (!chunk) { |
| 1049 | err = "failed to allocate new chunk"; |
| 1050 | goto fail; |
| 1051 | } |
| 1052 | |
| 1053 | spin_lock_irqsave(&pcpu_lock, flags); |
| 1054 | pcpu_chunk_relocate(chunk, -1); |
| 1055 | } else { |
| 1056 | spin_lock_irqsave(&pcpu_lock, flags); |
Tejun Heo | f2badb0 | 2009-09-29 09:17:58 +0900 | [diff] [blame] | 1057 | } |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1058 | |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1059 | goto restart; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1060 | |
| 1061 | area_found: |
Dennis Zhou | 30a5b53 | 2017-06-19 19:28:31 -0400 | [diff] [blame] | 1062 | pcpu_stats_area_alloc(chunk, size); |
Jiri Kosina | 403a91b | 2009-10-29 00:25:59 +0900 | [diff] [blame] | 1063 | spin_unlock_irqrestore(&pcpu_lock, flags); |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1064 | |
Tejun Heo | dca4964 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 1065 | /* populate if not all pages are already there */ |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1066 | if (!is_atomic) { |
Tejun Heo | e04d320 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1067 | int page_start, page_end, rs, re; |
Tejun Heo | dca4964 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 1068 | |
Tejun Heo | e04d320 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1069 | page_start = PFN_DOWN(off); |
| 1070 | page_end = PFN_UP(off + size); |
Tejun Heo | b38d08f | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1071 | |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 1072 | pcpu_for_each_unpop_region(chunk->populated, rs, re, |
| 1073 | page_start, page_end) { |
Tejun Heo | e04d320 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1074 | WARN_ON(chunk->immutable); |
| 1075 | |
| 1076 | ret = pcpu_populate_chunk(chunk, rs, re); |
| 1077 | |
| 1078 | spin_lock_irqsave(&pcpu_lock, flags); |
| 1079 | if (ret) { |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1080 | pcpu_free_area(chunk, off, &occ_pages); |
Tejun Heo | e04d320 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1081 | err = "failed to populate"; |
| 1082 | goto fail_unlock; |
| 1083 | } |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1084 | pcpu_chunk_populated(chunk, rs, re); |
Tejun Heo | e04d320 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1085 | spin_unlock_irqrestore(&pcpu_lock, flags); |
Tejun Heo | dca4964 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 1086 | } |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1087 | |
Tejun Heo | e04d320 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1088 | mutex_unlock(&pcpu_alloc_mutex); |
| 1089 | } |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1090 | |
Tahsin Erdogan | 320661b | 2017-02-25 13:00:19 -0800 | [diff] [blame] | 1091 | if (chunk != pcpu_reserved_chunk) { |
| 1092 | spin_lock_irqsave(&pcpu_lock, flags); |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1093 | pcpu_nr_empty_pop_pages -= occ_pages; |
Tahsin Erdogan | 320661b | 2017-02-25 13:00:19 -0800 | [diff] [blame] | 1094 | spin_unlock_irqrestore(&pcpu_lock, flags); |
| 1095 | } |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1096 | |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1097 | if (pcpu_nr_empty_pop_pages < PCPU_EMPTY_POP_PAGES_LOW) |
| 1098 | pcpu_schedule_balance_work(); |
| 1099 | |
Tejun Heo | dca4964 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 1100 | /* clear the areas and return address relative to base address */ |
| 1101 | for_each_possible_cpu(cpu) |
| 1102 | memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size); |
| 1103 | |
Catalin Marinas | f528f0b | 2011-09-26 17:12:53 +0100 | [diff] [blame] | 1104 | ptr = __addr_to_pcpu_ptr(chunk->base_addr + off); |
Larry Finger | 8a8c35f | 2015-06-24 16:58:51 -0700 | [diff] [blame] | 1105 | kmemleak_alloc_percpu(ptr, size, gfp); |
Dennis Zhou | df95e79 | 2017-06-19 19:28:32 -0400 | [diff] [blame] | 1106 | |
| 1107 | trace_percpu_alloc_percpu(reserved, is_atomic, size, align, |
| 1108 | chunk->base_addr, off, ptr); |
| 1109 | |
Catalin Marinas | f528f0b | 2011-09-26 17:12:53 +0100 | [diff] [blame] | 1110 | return ptr; |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1111 | |
| 1112 | fail_unlock: |
Jiri Kosina | 403a91b | 2009-10-29 00:25:59 +0900 | [diff] [blame] | 1113 | spin_unlock_irqrestore(&pcpu_lock, flags); |
Tejun Heo | b38d08f | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1114 | fail: |
Dennis Zhou | df95e79 | 2017-06-19 19:28:32 -0400 | [diff] [blame] | 1115 | trace_percpu_alloc_percpu_fail(reserved, is_atomic, size, align); |
| 1116 | |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1117 | if (!is_atomic && warn_limit) { |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 1118 | pr_warn("allocation failed, size=%zu align=%zu atomic=%d, %s\n", |
Joe Perches | 598d809 | 2016-03-17 14:19:44 -0700 | [diff] [blame] | 1119 | size, align, is_atomic, err); |
Tejun Heo | f2badb0 | 2009-09-29 09:17:58 +0900 | [diff] [blame] | 1120 | dump_stack(); |
| 1121 | if (!--warn_limit) |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 1122 | pr_info("limit reached, disable warning\n"); |
Tejun Heo | f2badb0 | 2009-09-29 09:17:58 +0900 | [diff] [blame] | 1123 | } |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1124 | if (is_atomic) { |
| 1125 | /* see the flag handling in pcpu_blance_workfn() */ |
| 1126 | pcpu_atomic_alloc_failed = true; |
| 1127 | pcpu_schedule_balance_work(); |
Tejun Heo | 6710e59 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 1128 | } else { |
| 1129 | mutex_unlock(&pcpu_alloc_mutex); |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1130 | } |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1131 | return NULL; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1132 | } |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1133 | |
| 1134 | /** |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1135 | * __alloc_percpu_gfp - allocate dynamic percpu area |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1136 | * @size: size of area to allocate in bytes |
| 1137 | * @align: alignment of area (max PAGE_SIZE) |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1138 | * @gfp: allocation flags |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1139 | * |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1140 | * Allocate zero-filled percpu area of @size bytes aligned at @align. If |
| 1141 | * @gfp doesn't contain %GFP_KERNEL, the allocation doesn't block and can |
| 1142 | * be called from any context but is a lot more likely to fail. |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1143 | * |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1144 | * RETURNS: |
| 1145 | * Percpu pointer to the allocated area on success, NULL on failure. |
| 1146 | */ |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1147 | void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp) |
| 1148 | { |
| 1149 | return pcpu_alloc(size, align, false, gfp); |
| 1150 | } |
| 1151 | EXPORT_SYMBOL_GPL(__alloc_percpu_gfp); |
| 1152 | |
| 1153 | /** |
| 1154 | * __alloc_percpu - allocate dynamic percpu area |
| 1155 | * @size: size of area to allocate in bytes |
| 1156 | * @align: alignment of area (max PAGE_SIZE) |
| 1157 | * |
| 1158 | * Equivalent to __alloc_percpu_gfp(size, align, %GFP_KERNEL). |
| 1159 | */ |
Tejun Heo | 43cf38e | 2010-02-02 14:38:57 +0900 | [diff] [blame] | 1160 | void __percpu *__alloc_percpu(size_t size, size_t align) |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1161 | { |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1162 | return pcpu_alloc(size, align, false, GFP_KERNEL); |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1163 | } |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1164 | EXPORT_SYMBOL_GPL(__alloc_percpu); |
| 1165 | |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1166 | /** |
| 1167 | * __alloc_reserved_percpu - allocate reserved percpu area |
| 1168 | * @size: size of area to allocate in bytes |
| 1169 | * @align: alignment of area (max PAGE_SIZE) |
| 1170 | * |
Tejun Heo | 9329ba9 | 2010-09-10 11:01:56 +0200 | [diff] [blame] | 1171 | * Allocate zero-filled percpu area of @size bytes aligned at @align |
| 1172 | * from reserved percpu area if arch has set it up; otherwise, |
| 1173 | * allocation is served from the same dynamic area. Might sleep. |
| 1174 | * Might trigger writeouts. |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1175 | * |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1176 | * CONTEXT: |
| 1177 | * Does GFP_KERNEL allocation. |
| 1178 | * |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1179 | * RETURNS: |
| 1180 | * Percpu pointer to the allocated area on success, NULL on failure. |
| 1181 | */ |
Tejun Heo | 43cf38e | 2010-02-02 14:38:57 +0900 | [diff] [blame] | 1182 | void __percpu *__alloc_reserved_percpu(size_t size, size_t align) |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1183 | { |
Tejun Heo | 5835d96 | 2014-09-02 14:46:04 -0400 | [diff] [blame] | 1184 | return pcpu_alloc(size, align, true, GFP_KERNEL); |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1185 | } |
| 1186 | |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1187 | /** |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1188 | * pcpu_balance_workfn - manage the amount of free chunks and populated pages |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1189 | * @work: unused |
| 1190 | * |
| 1191 | * Reclaim all fully free chunks except for the first one. |
| 1192 | */ |
Tejun Heo | fe6bd8c | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1193 | static void pcpu_balance_workfn(struct work_struct *work) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1194 | { |
Tejun Heo | fe6bd8c | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1195 | LIST_HEAD(to_free); |
| 1196 | struct list_head *free_head = &pcpu_slot[pcpu_nr_slots - 1]; |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1197 | struct pcpu_chunk *chunk, *next; |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1198 | int slot, nr_to_pop, ret; |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1199 | |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1200 | /* |
| 1201 | * There's no reason to keep around multiple unused chunks and VM |
| 1202 | * areas can be scarce. Destroy all free chunks except for one. |
| 1203 | */ |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1204 | mutex_lock(&pcpu_alloc_mutex); |
| 1205 | spin_lock_irq(&pcpu_lock); |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1206 | |
Tejun Heo | fe6bd8c | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1207 | list_for_each_entry_safe(chunk, next, free_head, list) { |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1208 | WARN_ON(chunk->immutable); |
| 1209 | |
| 1210 | /* spare the first one */ |
Tejun Heo | fe6bd8c | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1211 | if (chunk == list_first_entry(free_head, struct pcpu_chunk, list)) |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1212 | continue; |
| 1213 | |
Tejun Heo | 4f996e2 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 1214 | list_del_init(&chunk->map_extend_list); |
Tejun Heo | fe6bd8c | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1215 | list_move(&chunk->list, &to_free); |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1216 | } |
| 1217 | |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1218 | spin_unlock_irq(&pcpu_lock); |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1219 | |
Tejun Heo | fe6bd8c | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1220 | list_for_each_entry_safe(chunk, next, &to_free, list) { |
Tejun Heo | a93ace4 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1221 | int rs, re; |
Tejun Heo | dca4964 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 1222 | |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 1223 | pcpu_for_each_pop_region(chunk->populated, rs, re, 0, |
| 1224 | chunk->nr_pages) { |
Tejun Heo | a93ace4 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1225 | pcpu_depopulate_chunk(chunk, rs, re); |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1226 | spin_lock_irq(&pcpu_lock); |
| 1227 | pcpu_chunk_depopulated(chunk, rs, re); |
| 1228 | spin_unlock_irq(&pcpu_lock); |
Tejun Heo | a93ace4 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 1229 | } |
Tejun Heo | 6081089 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 1230 | pcpu_destroy_chunk(chunk); |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1231 | } |
Tejun Heo | 971f391 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 1232 | |
Tejun Heo | 4f996e2 | 2016-05-25 11:48:25 -0400 | [diff] [blame] | 1233 | /* service chunks which requested async area map extension */ |
| 1234 | do { |
| 1235 | int new_alloc = 0; |
| 1236 | |
| 1237 | spin_lock_irq(&pcpu_lock); |
| 1238 | |
| 1239 | chunk = list_first_entry_or_null(&pcpu_map_extend_chunks, |
| 1240 | struct pcpu_chunk, map_extend_list); |
| 1241 | if (chunk) { |
| 1242 | list_del_init(&chunk->map_extend_list); |
| 1243 | new_alloc = pcpu_need_to_extend(chunk, false); |
| 1244 | } |
| 1245 | |
| 1246 | spin_unlock_irq(&pcpu_lock); |
| 1247 | |
| 1248 | if (new_alloc) |
| 1249 | pcpu_extend_area_map(chunk, new_alloc); |
| 1250 | } while (chunk); |
| 1251 | |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1252 | /* |
| 1253 | * Ensure there are certain number of free populated pages for |
| 1254 | * atomic allocs. Fill up from the most packed so that atomic |
| 1255 | * allocs don't increase fragmentation. If atomic allocation |
| 1256 | * failed previously, always populate the maximum amount. This |
| 1257 | * should prevent atomic allocs larger than PAGE_SIZE from keeping |
| 1258 | * failing indefinitely; however, large atomic allocs are not |
| 1259 | * something we support properly and can be highly unreliable and |
| 1260 | * inefficient. |
| 1261 | */ |
| 1262 | retry_pop: |
| 1263 | if (pcpu_atomic_alloc_failed) { |
| 1264 | nr_to_pop = PCPU_EMPTY_POP_PAGES_HIGH; |
| 1265 | /* best effort anyway, don't worry about synchronization */ |
| 1266 | pcpu_atomic_alloc_failed = false; |
| 1267 | } else { |
| 1268 | nr_to_pop = clamp(PCPU_EMPTY_POP_PAGES_HIGH - |
| 1269 | pcpu_nr_empty_pop_pages, |
| 1270 | 0, PCPU_EMPTY_POP_PAGES_HIGH); |
| 1271 | } |
| 1272 | |
| 1273 | for (slot = pcpu_size_to_slot(PAGE_SIZE); slot < pcpu_nr_slots; slot++) { |
| 1274 | int nr_unpop = 0, rs, re; |
| 1275 | |
| 1276 | if (!nr_to_pop) |
| 1277 | break; |
| 1278 | |
| 1279 | spin_lock_irq(&pcpu_lock); |
| 1280 | list_for_each_entry(chunk, &pcpu_slot[slot], list) { |
Dennis Zhou (Facebook) | 8ab16c4 | 2017-07-24 19:02:07 -0400 | [diff] [blame] | 1281 | nr_unpop = chunk->nr_pages - chunk->nr_populated; |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1282 | if (nr_unpop) |
| 1283 | break; |
| 1284 | } |
| 1285 | spin_unlock_irq(&pcpu_lock); |
| 1286 | |
| 1287 | if (!nr_unpop) |
| 1288 | continue; |
| 1289 | |
| 1290 | /* @chunk can't go away while pcpu_alloc_mutex is held */ |
Dennis Zhou (Facebook) | 91e914c | 2017-07-24 19:02:10 -0400 | [diff] [blame^] | 1291 | pcpu_for_each_unpop_region(chunk->populated, rs, re, 0, |
| 1292 | chunk->nr_pages) { |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1293 | int nr = min(re - rs, nr_to_pop); |
| 1294 | |
| 1295 | ret = pcpu_populate_chunk(chunk, rs, rs + nr); |
| 1296 | if (!ret) { |
| 1297 | nr_to_pop -= nr; |
| 1298 | spin_lock_irq(&pcpu_lock); |
| 1299 | pcpu_chunk_populated(chunk, rs, rs + nr); |
| 1300 | spin_unlock_irq(&pcpu_lock); |
| 1301 | } else { |
| 1302 | nr_to_pop = 0; |
| 1303 | } |
| 1304 | |
| 1305 | if (!nr_to_pop) |
| 1306 | break; |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | if (nr_to_pop) { |
| 1311 | /* ran out of chunks to populate, create a new one and retry */ |
| 1312 | chunk = pcpu_create_chunk(); |
| 1313 | if (chunk) { |
| 1314 | spin_lock_irq(&pcpu_lock); |
| 1315 | pcpu_chunk_relocate(chunk, -1); |
| 1316 | spin_unlock_irq(&pcpu_lock); |
| 1317 | goto retry_pop; |
| 1318 | } |
| 1319 | } |
| 1320 | |
Tejun Heo | 971f391 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 1321 | mutex_unlock(&pcpu_alloc_mutex); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1322 | } |
| 1323 | |
| 1324 | /** |
| 1325 | * free_percpu - free percpu area |
| 1326 | * @ptr: pointer to area to free |
| 1327 | * |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1328 | * Free percpu area @ptr. |
| 1329 | * |
| 1330 | * CONTEXT: |
| 1331 | * Can be called from atomic context. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1332 | */ |
Tejun Heo | 43cf38e | 2010-02-02 14:38:57 +0900 | [diff] [blame] | 1333 | void free_percpu(void __percpu *ptr) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1334 | { |
Andrew Morton | 129182e | 2010-01-08 14:42:39 -0800 | [diff] [blame] | 1335 | void *addr; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1336 | struct pcpu_chunk *chunk; |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1337 | unsigned long flags; |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1338 | int off, occ_pages; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1339 | |
| 1340 | if (!ptr) |
| 1341 | return; |
| 1342 | |
Catalin Marinas | f528f0b | 2011-09-26 17:12:53 +0100 | [diff] [blame] | 1343 | kmemleak_free_percpu(ptr); |
| 1344 | |
Andrew Morton | 129182e | 2010-01-08 14:42:39 -0800 | [diff] [blame] | 1345 | addr = __pcpu_ptr_to_addr(ptr); |
| 1346 | |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1347 | spin_lock_irqsave(&pcpu_lock, flags); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1348 | |
| 1349 | chunk = pcpu_chunk_addr_search(addr); |
Tejun Heo | bba174f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1350 | off = addr - chunk->base_addr; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1351 | |
Tejun Heo | b539b87 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1352 | pcpu_free_area(chunk, off, &occ_pages); |
| 1353 | |
| 1354 | if (chunk != pcpu_reserved_chunk) |
| 1355 | pcpu_nr_empty_pop_pages += occ_pages; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1356 | |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1357 | /* if there are more than one fully free chunks, wake up grim reaper */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1358 | if (chunk->free_size == pcpu_unit_size) { |
| 1359 | struct pcpu_chunk *pos; |
| 1360 | |
Tejun Heo | a56dbdd | 2009-03-07 00:44:11 +0900 | [diff] [blame] | 1361 | list_for_each_entry(pos, &pcpu_slot[pcpu_nr_slots - 1], list) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1362 | if (pos != chunk) { |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 1363 | pcpu_schedule_balance_work(); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1364 | break; |
| 1365 | } |
| 1366 | } |
| 1367 | |
Dennis Zhou | df95e79 | 2017-06-19 19:28:32 -0400 | [diff] [blame] | 1368 | trace_percpu_free_percpu(chunk->base_addr, off, ptr); |
| 1369 | |
Tejun Heo | ccea34b | 2009-03-07 00:44:13 +0900 | [diff] [blame] | 1370 | spin_unlock_irqrestore(&pcpu_lock, flags); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1371 | } |
| 1372 | EXPORT_SYMBOL_GPL(free_percpu); |
| 1373 | |
Thomas Gleixner | 383776f | 2017-02-27 15:37:36 +0100 | [diff] [blame] | 1374 | bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr) |
| 1375 | { |
| 1376 | #ifdef CONFIG_SMP |
| 1377 | const size_t static_size = __per_cpu_end - __per_cpu_start; |
| 1378 | void __percpu *base = __addr_to_pcpu_ptr(pcpu_base_addr); |
| 1379 | unsigned int cpu; |
| 1380 | |
| 1381 | for_each_possible_cpu(cpu) { |
| 1382 | void *start = per_cpu_ptr(base, cpu); |
| 1383 | void *va = (void *)addr; |
| 1384 | |
| 1385 | if (va >= start && va < start + static_size) { |
Peter Zijlstra | 8ce371f | 2017-03-20 12:26:55 +0100 | [diff] [blame] | 1386 | if (can_addr) { |
Thomas Gleixner | 383776f | 2017-02-27 15:37:36 +0100 | [diff] [blame] | 1387 | *can_addr = (unsigned long) (va - start); |
Peter Zijlstra | 8ce371f | 2017-03-20 12:26:55 +0100 | [diff] [blame] | 1388 | *can_addr += (unsigned long) |
| 1389 | per_cpu_ptr(base, get_boot_cpu_id()); |
| 1390 | } |
Thomas Gleixner | 383776f | 2017-02-27 15:37:36 +0100 | [diff] [blame] | 1391 | return true; |
| 1392 | } |
| 1393 | } |
| 1394 | #endif |
| 1395 | /* on UP, can't distinguish from other static vars, always false */ |
| 1396 | return false; |
| 1397 | } |
| 1398 | |
Vivek Goyal | 3b034b0 | 2009-11-24 15:50:03 +0900 | [diff] [blame] | 1399 | /** |
Tejun Heo | 10fad5e | 2010-03-10 18:57:54 +0900 | [diff] [blame] | 1400 | * is_kernel_percpu_address - test whether address is from static percpu area |
| 1401 | * @addr: address to test |
| 1402 | * |
| 1403 | * Test whether @addr belongs to in-kernel static percpu area. Module |
| 1404 | * static percpu areas are not considered. For those, use |
| 1405 | * is_module_percpu_address(). |
| 1406 | * |
| 1407 | * RETURNS: |
| 1408 | * %true if @addr is from in-kernel static percpu area, %false otherwise. |
| 1409 | */ |
| 1410 | bool is_kernel_percpu_address(unsigned long addr) |
| 1411 | { |
Thomas Gleixner | 383776f | 2017-02-27 15:37:36 +0100 | [diff] [blame] | 1412 | return __is_kernel_percpu_address(addr, NULL); |
Tejun Heo | 10fad5e | 2010-03-10 18:57:54 +0900 | [diff] [blame] | 1413 | } |
| 1414 | |
| 1415 | /** |
Vivek Goyal | 3b034b0 | 2009-11-24 15:50:03 +0900 | [diff] [blame] | 1416 | * per_cpu_ptr_to_phys - convert translated percpu address to physical address |
| 1417 | * @addr: the address to be converted to physical address |
| 1418 | * |
| 1419 | * Given @addr which is dereferenceable address obtained via one of |
| 1420 | * percpu access macros, this function translates it into its physical |
| 1421 | * address. The caller is responsible for ensuring @addr stays valid |
| 1422 | * until this function finishes. |
| 1423 | * |
Dave Young | 67589c7 | 2011-11-23 08:20:53 -0800 | [diff] [blame] | 1424 | * percpu allocator has special setup for the first chunk, which currently |
| 1425 | * supports either embedding in linear address space or vmalloc mapping, |
| 1426 | * and, from the second one, the backing allocator (currently either vm or |
| 1427 | * km) provides translation. |
| 1428 | * |
Yannick Guerrini | bffc437 | 2015-03-06 23:30:42 +0100 | [diff] [blame] | 1429 | * The addr can be translated simply without checking if it falls into the |
Dave Young | 67589c7 | 2011-11-23 08:20:53 -0800 | [diff] [blame] | 1430 | * first chunk. But the current code reflects better how percpu allocator |
| 1431 | * actually works, and the verification can discover both bugs in percpu |
| 1432 | * allocator itself and per_cpu_ptr_to_phys() callers. So we keep current |
| 1433 | * code. |
| 1434 | * |
Vivek Goyal | 3b034b0 | 2009-11-24 15:50:03 +0900 | [diff] [blame] | 1435 | * RETURNS: |
| 1436 | * The physical address for @addr. |
| 1437 | */ |
| 1438 | phys_addr_t per_cpu_ptr_to_phys(void *addr) |
| 1439 | { |
Tejun Heo | 9983b6f0 | 2010-06-18 11:44:31 +0200 | [diff] [blame] | 1440 | void __percpu *base = __addr_to_pcpu_ptr(pcpu_base_addr); |
| 1441 | bool in_first_chunk = false; |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 1442 | unsigned long first_low, first_high; |
Tejun Heo | 9983b6f0 | 2010-06-18 11:44:31 +0200 | [diff] [blame] | 1443 | unsigned int cpu; |
| 1444 | |
| 1445 | /* |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 1446 | * The following test on unit_low/high isn't strictly |
Tejun Heo | 9983b6f0 | 2010-06-18 11:44:31 +0200 | [diff] [blame] | 1447 | * necessary but will speed up lookups of addresses which |
| 1448 | * aren't in the first chunk. |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1449 | * |
| 1450 | * The address check is against full chunk sizes. pcpu_base_addr |
| 1451 | * points to the beginning of the first chunk including the |
| 1452 | * static region. Assumes good intent as the first chunk may |
| 1453 | * not be full (ie. < pcpu_unit_pages in size). |
Tejun Heo | 9983b6f0 | 2010-06-18 11:44:31 +0200 | [diff] [blame] | 1454 | */ |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1455 | first_low = (unsigned long)pcpu_base_addr + |
| 1456 | pcpu_unit_page_offset(pcpu_low_unit_cpu, 0); |
| 1457 | first_high = (unsigned long)pcpu_base_addr + |
| 1458 | pcpu_unit_page_offset(pcpu_high_unit_cpu, pcpu_unit_pages); |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 1459 | if ((unsigned long)addr >= first_low && |
| 1460 | (unsigned long)addr < first_high) { |
Tejun Heo | 9983b6f0 | 2010-06-18 11:44:31 +0200 | [diff] [blame] | 1461 | for_each_possible_cpu(cpu) { |
| 1462 | void *start = per_cpu_ptr(base, cpu); |
| 1463 | |
| 1464 | if (addr >= start && addr < start + pcpu_unit_size) { |
| 1465 | in_first_chunk = true; |
| 1466 | break; |
| 1467 | } |
| 1468 | } |
| 1469 | } |
| 1470 | |
| 1471 | if (in_first_chunk) { |
David Howells | eac522e | 2011-03-28 12:53:29 +0100 | [diff] [blame] | 1472 | if (!is_vmalloc_addr(addr)) |
Tejun Heo | 020ec65 | 2010-04-09 18:57:00 +0900 | [diff] [blame] | 1473 | return __pa(addr); |
| 1474 | else |
Eugene Surovegin | 9f57bd4 | 2011-12-15 11:25:59 -0800 | [diff] [blame] | 1475 | return page_to_phys(vmalloc_to_page(addr)) + |
| 1476 | offset_in_page(addr); |
Tejun Heo | 020ec65 | 2010-04-09 18:57:00 +0900 | [diff] [blame] | 1477 | } else |
Eugene Surovegin | 9f57bd4 | 2011-12-15 11:25:59 -0800 | [diff] [blame] | 1478 | return page_to_phys(pcpu_addr_to_page(addr)) + |
| 1479 | offset_in_page(addr); |
Vivek Goyal | 3b034b0 | 2009-11-24 15:50:03 +0900 | [diff] [blame] | 1480 | } |
| 1481 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1482 | /** |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1483 | * pcpu_alloc_alloc_info - allocate percpu allocation info |
| 1484 | * @nr_groups: the number of groups |
| 1485 | * @nr_units: the number of units |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1486 | * |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1487 | * Allocate ai which is large enough for @nr_groups groups containing |
| 1488 | * @nr_units units. The returned ai's groups[0].cpu_map points to the |
| 1489 | * cpu_map array which is long enough for @nr_units and filled with |
| 1490 | * NR_CPUS. It's the caller's responsibility to initialize cpu_map |
| 1491 | * pointer of other groups. |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1492 | * |
| 1493 | * RETURNS: |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1494 | * Pointer to the allocated pcpu_alloc_info on success, NULL on |
| 1495 | * failure. |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1496 | */ |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1497 | struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
| 1498 | int nr_units) |
| 1499 | { |
| 1500 | struct pcpu_alloc_info *ai; |
| 1501 | size_t base_size, ai_size; |
| 1502 | void *ptr; |
| 1503 | int unit; |
| 1504 | |
| 1505 | base_size = ALIGN(sizeof(*ai) + nr_groups * sizeof(ai->groups[0]), |
| 1506 | __alignof__(ai->groups[0].cpu_map[0])); |
| 1507 | ai_size = base_size + nr_units * sizeof(ai->groups[0].cpu_map[0]); |
| 1508 | |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 1509 | ptr = memblock_virt_alloc_nopanic(PFN_ALIGN(ai_size), 0); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1510 | if (!ptr) |
| 1511 | return NULL; |
| 1512 | ai = ptr; |
| 1513 | ptr += base_size; |
| 1514 | |
| 1515 | ai->groups[0].cpu_map = ptr; |
| 1516 | |
| 1517 | for (unit = 0; unit < nr_units; unit++) |
| 1518 | ai->groups[0].cpu_map[unit] = NR_CPUS; |
| 1519 | |
| 1520 | ai->nr_groups = nr_groups; |
| 1521 | ai->__ai_size = PFN_ALIGN(ai_size); |
| 1522 | |
| 1523 | return ai; |
| 1524 | } |
| 1525 | |
| 1526 | /** |
| 1527 | * pcpu_free_alloc_info - free percpu allocation info |
| 1528 | * @ai: pcpu_alloc_info to free |
| 1529 | * |
| 1530 | * Free @ai which was allocated by pcpu_alloc_alloc_info(). |
| 1531 | */ |
| 1532 | void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai) |
| 1533 | { |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 1534 | memblock_free_early(__pa(ai), ai->__ai_size); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1535 | } |
| 1536 | |
| 1537 | /** |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1538 | * pcpu_dump_alloc_info - print out information about pcpu_alloc_info |
| 1539 | * @lvl: loglevel |
| 1540 | * @ai: allocation info to dump |
| 1541 | * |
| 1542 | * Print out information about @ai using loglevel @lvl. |
| 1543 | */ |
| 1544 | static void pcpu_dump_alloc_info(const char *lvl, |
| 1545 | const struct pcpu_alloc_info *ai) |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1546 | { |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1547 | int group_width = 1, cpu_width = 1, width; |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1548 | char empty_str[] = "--------"; |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1549 | int alloc = 0, alloc_end = 0; |
| 1550 | int group, v; |
| 1551 | int upa, apl; /* units per alloc, allocs per line */ |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1552 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1553 | v = ai->nr_groups; |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1554 | while (v /= 10) |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1555 | group_width++; |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1556 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1557 | v = num_possible_cpus(); |
| 1558 | while (v /= 10) |
| 1559 | cpu_width++; |
| 1560 | empty_str[min_t(int, cpu_width, sizeof(empty_str) - 1)] = '\0'; |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1561 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1562 | upa = ai->alloc_size / ai->unit_size; |
| 1563 | width = upa * (cpu_width + 1) + group_width + 3; |
| 1564 | apl = rounddown_pow_of_two(max(60 / width, 1)); |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1565 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1566 | printk("%spcpu-alloc: s%zu r%zu d%zu u%zu alloc=%zu*%zu", |
| 1567 | lvl, ai->static_size, ai->reserved_size, ai->dyn_size, |
| 1568 | ai->unit_size, ai->alloc_size / ai->atom_size, ai->atom_size); |
| 1569 | |
| 1570 | for (group = 0; group < ai->nr_groups; group++) { |
| 1571 | const struct pcpu_group_info *gi = &ai->groups[group]; |
| 1572 | int unit = 0, unit_end = 0; |
| 1573 | |
| 1574 | BUG_ON(gi->nr_units % upa); |
| 1575 | for (alloc_end += gi->nr_units / upa; |
| 1576 | alloc < alloc_end; alloc++) { |
| 1577 | if (!(alloc % apl)) { |
Joe Perches | 1170532 | 2016-03-17 14:19:50 -0700 | [diff] [blame] | 1578 | pr_cont("\n"); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1579 | printk("%spcpu-alloc: ", lvl); |
| 1580 | } |
Joe Perches | 1170532 | 2016-03-17 14:19:50 -0700 | [diff] [blame] | 1581 | pr_cont("[%0*d] ", group_width, group); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1582 | |
| 1583 | for (unit_end += upa; unit < unit_end; unit++) |
| 1584 | if (gi->cpu_map[unit] != NR_CPUS) |
Joe Perches | 1170532 | 2016-03-17 14:19:50 -0700 | [diff] [blame] | 1585 | pr_cont("%0*d ", |
| 1586 | cpu_width, gi->cpu_map[unit]); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1587 | else |
Joe Perches | 1170532 | 2016-03-17 14:19:50 -0700 | [diff] [blame] | 1588 | pr_cont("%s ", empty_str); |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1589 | } |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1590 | } |
Joe Perches | 1170532 | 2016-03-17 14:19:50 -0700 | [diff] [blame] | 1591 | pr_cont("\n"); |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1592 | } |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1593 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1594 | /** |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1595 | * pcpu_setup_first_chunk - initialize the first percpu chunk |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1596 | * @ai: pcpu_alloc_info describing how to percpu area is shaped |
Tejun Heo | 38a6be5 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 1597 | * @base_addr: mapped address |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1598 | * |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1599 | * Initialize the first percpu chunk which contains the kernel static |
| 1600 | * perpcu area. This function is to be called from arch percpu area |
Tejun Heo | 38a6be5 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 1601 | * setup path. |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1602 | * |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1603 | * @ai contains all information necessary to initialize the first |
| 1604 | * chunk and prime the dynamic percpu allocator. |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1605 | * |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1606 | * @ai->static_size is the size of static percpu area. |
| 1607 | * |
| 1608 | * @ai->reserved_size, if non-zero, specifies the amount of bytes to |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1609 | * reserve after the static area in the first chunk. This reserves |
| 1610 | * the first chunk such that it's available only through reserved |
| 1611 | * percpu allocation. This is primarily used to serve module percpu |
| 1612 | * static areas on architectures where the addressing model has |
| 1613 | * limited offset range for symbol relocations to guarantee module |
| 1614 | * percpu symbols fall inside the relocatable range. |
| 1615 | * |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1616 | * @ai->dyn_size determines the number of bytes available for dynamic |
| 1617 | * allocation in the first chunk. The area between @ai->static_size + |
| 1618 | * @ai->reserved_size + @ai->dyn_size and @ai->unit_size is unused. |
Tejun Heo | 6074d5b | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 1619 | * |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1620 | * @ai->unit_size specifies unit size and must be aligned to PAGE_SIZE |
| 1621 | * and equal to or larger than @ai->static_size + @ai->reserved_size + |
| 1622 | * @ai->dyn_size. |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1623 | * |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1624 | * @ai->atom_size is the allocation atom size and used as alignment |
| 1625 | * for vm areas. |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1626 | * |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1627 | * @ai->alloc_size is the allocation size and always multiple of |
| 1628 | * @ai->atom_size. This is larger than @ai->atom_size if |
| 1629 | * @ai->unit_size is larger than @ai->atom_size. |
| 1630 | * |
| 1631 | * @ai->nr_groups and @ai->groups describe virtual memory layout of |
| 1632 | * percpu areas. Units which should be colocated are put into the |
| 1633 | * same group. Dynamic VM areas will be allocated according to these |
| 1634 | * groupings. If @ai->nr_groups is zero, a single group containing |
| 1635 | * all units is assumed. |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1636 | * |
Tejun Heo | 38a6be5 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 1637 | * The caller should have mapped the first chunk at @base_addr and |
| 1638 | * copied static data to each unit. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1639 | * |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1640 | * The first chunk will always contain a static and a dynamic region. |
| 1641 | * However, the static region is not managed by any chunk. If the first |
| 1642 | * chunk also contains a reserved region, it is served by two chunks - |
| 1643 | * one for the reserved region and one for the dynamic region. They |
| 1644 | * share the same vm, but use offset regions in the area allocation map. |
| 1645 | * The chunk serving the dynamic region is circulated in the chunk slots |
| 1646 | * and available for dynamic allocation like any other chunk. |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1647 | * |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1648 | * RETURNS: |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1649 | * 0 on success, -errno on failure. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1650 | */ |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1651 | int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
| 1652 | void *base_addr) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1653 | { |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 1654 | static int smap[PERCPU_DYNAMIC_EARLY_SLOTS] __initdata; |
| 1655 | static int dmap[PERCPU_DYNAMIC_EARLY_SLOTS] __initdata; |
Dennis Zhou (Facebook) | b9c3944 | 2017-07-24 19:02:01 -0400 | [diff] [blame] | 1656 | size_t size_sum = ai->static_size + ai->reserved_size + ai->dyn_size; |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 1657 | size_t static_size, dyn_size; |
Dennis Zhou (Facebook) | 0c4169c | 2017-07-24 19:02:04 -0400 | [diff] [blame] | 1658 | struct pcpu_chunk *chunk; |
Tejun Heo | 6563297 | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 1659 | unsigned long *group_offsets; |
| 1660 | size_t *group_sizes; |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1661 | unsigned long *unit_off; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1662 | unsigned int cpu; |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1663 | int *unit_map; |
| 1664 | int group, unit, i; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1665 | int map_size; |
| 1666 | unsigned long tmp_addr; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1667 | |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1668 | #define PCPU_SETUP_BUG_ON(cond) do { \ |
| 1669 | if (unlikely(cond)) { \ |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 1670 | pr_emerg("failed to initialize, %s\n", #cond); \ |
| 1671 | pr_emerg("cpu_possible_mask=%*pb\n", \ |
Tejun Heo | 807de07 | 2015-02-13 14:37:34 -0800 | [diff] [blame] | 1672 | cpumask_pr_args(cpu_possible_mask)); \ |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1673 | pcpu_dump_alloc_info(KERN_EMERG, ai); \ |
| 1674 | BUG(); \ |
| 1675 | } \ |
| 1676 | } while (0) |
| 1677 | |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1678 | /* sanity checks */ |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1679 | PCPU_SETUP_BUG_ON(ai->nr_groups <= 0); |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 1680 | #ifdef CONFIG_SMP |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1681 | PCPU_SETUP_BUG_ON(!ai->static_size); |
Alexander Kuleshov | f09f124 | 2015-11-05 18:46:43 -0800 | [diff] [blame] | 1682 | PCPU_SETUP_BUG_ON(offset_in_page(__per_cpu_start)); |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 1683 | #endif |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1684 | PCPU_SETUP_BUG_ON(!base_addr); |
Alexander Kuleshov | f09f124 | 2015-11-05 18:46:43 -0800 | [diff] [blame] | 1685 | PCPU_SETUP_BUG_ON(offset_in_page(base_addr)); |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1686 | PCPU_SETUP_BUG_ON(ai->unit_size < size_sum); |
Alexander Kuleshov | f09f124 | 2015-11-05 18:46:43 -0800 | [diff] [blame] | 1687 | PCPU_SETUP_BUG_ON(offset_in_page(ai->unit_size)); |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1688 | PCPU_SETUP_BUG_ON(ai->unit_size < PCPU_MIN_UNIT_SIZE); |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 1689 | PCPU_SETUP_BUG_ON(ai->dyn_size < PERCPU_DYNAMIC_EARLY_SIZE); |
Dennis Zhou (Facebook) | fb29a2c | 2017-07-24 19:01:58 -0400 | [diff] [blame] | 1690 | PCPU_SETUP_BUG_ON(!ai->dyn_size); |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 1691 | PCPU_SETUP_BUG_ON(!IS_ALIGNED(ai->reserved_size, PCPU_MIN_ALLOC_SIZE)); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 1692 | PCPU_SETUP_BUG_ON(pcpu_verify_alloc_info(ai) < 0); |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1693 | |
Tejun Heo | 6563297 | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 1694 | /* process group information and build config tables accordingly */ |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 1695 | group_offsets = memblock_virt_alloc(ai->nr_groups * |
| 1696 | sizeof(group_offsets[0]), 0); |
| 1697 | group_sizes = memblock_virt_alloc(ai->nr_groups * |
| 1698 | sizeof(group_sizes[0]), 0); |
| 1699 | unit_map = memblock_virt_alloc(nr_cpu_ids * sizeof(unit_map[0]), 0); |
| 1700 | unit_off = memblock_virt_alloc(nr_cpu_ids * sizeof(unit_off[0]), 0); |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1701 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1702 | for (cpu = 0; cpu < nr_cpu_ids; cpu++) |
Tejun Heo | ffe0d5a | 2009-09-29 09:17:56 +0900 | [diff] [blame] | 1703 | unit_map[cpu] = UINT_MAX; |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 1704 | |
| 1705 | pcpu_low_unit_cpu = NR_CPUS; |
| 1706 | pcpu_high_unit_cpu = NR_CPUS; |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1707 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1708 | for (group = 0, unit = 0; group < ai->nr_groups; group++, unit += i) { |
| 1709 | const struct pcpu_group_info *gi = &ai->groups[group]; |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1710 | |
Tejun Heo | 6563297 | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 1711 | group_offsets[group] = gi->base_offset; |
| 1712 | group_sizes[group] = gi->nr_units * ai->unit_size; |
| 1713 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1714 | for (i = 0; i < gi->nr_units; i++) { |
| 1715 | cpu = gi->cpu_map[i]; |
| 1716 | if (cpu == NR_CPUS) |
| 1717 | continue; |
| 1718 | |
Dan Carpenter | 9f29566 | 2014-10-29 11:45:04 +0300 | [diff] [blame] | 1719 | PCPU_SETUP_BUG_ON(cpu >= nr_cpu_ids); |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1720 | PCPU_SETUP_BUG_ON(!cpu_possible(cpu)); |
| 1721 | PCPU_SETUP_BUG_ON(unit_map[cpu] != UINT_MAX); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1722 | |
| 1723 | unit_map[cpu] = unit + i; |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1724 | unit_off[cpu] = gi->base_offset + i * ai->unit_size; |
| 1725 | |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 1726 | /* determine low/high unit_cpu */ |
| 1727 | if (pcpu_low_unit_cpu == NR_CPUS || |
| 1728 | unit_off[cpu] < unit_off[pcpu_low_unit_cpu]) |
| 1729 | pcpu_low_unit_cpu = cpu; |
| 1730 | if (pcpu_high_unit_cpu == NR_CPUS || |
| 1731 | unit_off[cpu] > unit_off[pcpu_high_unit_cpu]) |
| 1732 | pcpu_high_unit_cpu = cpu; |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1733 | } |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1734 | } |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1735 | pcpu_nr_units = unit; |
| 1736 | |
| 1737 | for_each_possible_cpu(cpu) |
Tejun Heo | 635b75f | 2009-09-24 09:43:11 +0900 | [diff] [blame] | 1738 | PCPU_SETUP_BUG_ON(unit_map[cpu] == UINT_MAX); |
| 1739 | |
| 1740 | /* we're done parsing the input, undefine BUG macro and dump config */ |
| 1741 | #undef PCPU_SETUP_BUG_ON |
Tejun Heo | bcbea79 | 2010-12-22 14:19:14 +0100 | [diff] [blame] | 1742 | pcpu_dump_alloc_info(KERN_DEBUG, ai); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1743 | |
Tejun Heo | 6563297 | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 1744 | pcpu_nr_groups = ai->nr_groups; |
| 1745 | pcpu_group_offsets = group_offsets; |
| 1746 | pcpu_group_sizes = group_sizes; |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1747 | pcpu_unit_map = unit_map; |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1748 | pcpu_unit_offsets = unit_off; |
Tejun Heo | 2f39e63 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1749 | |
| 1750 | /* determine basic parameters */ |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1751 | pcpu_unit_pages = ai->unit_size >> PAGE_SHIFT; |
Tejun Heo | d9b55ee | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1752 | pcpu_unit_size = pcpu_unit_pages << PAGE_SHIFT; |
Tejun Heo | 6563297 | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 1753 | pcpu_atom_size = ai->atom_size; |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 1754 | pcpu_chunk_struct_size = sizeof(struct pcpu_chunk) + |
| 1755 | BITS_TO_LONGS(pcpu_unit_pages) * sizeof(unsigned long); |
Tejun Heo | cafe881 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1756 | |
Dennis Zhou | 30a5b53 | 2017-06-19 19:28:31 -0400 | [diff] [blame] | 1757 | pcpu_stats_save_ai(ai); |
| 1758 | |
Tejun Heo | d9b55ee | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 1759 | /* |
| 1760 | * Allocate chunk slots. The additional last slot is for |
| 1761 | * empty chunks. |
| 1762 | */ |
| 1763 | pcpu_nr_slots = __pcpu_size_to_slot(pcpu_unit_size) + 2; |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 1764 | pcpu_slot = memblock_virt_alloc( |
| 1765 | pcpu_nr_slots * sizeof(pcpu_slot[0]), 0); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1766 | for (i = 0; i < pcpu_nr_slots; i++) |
| 1767 | INIT_LIST_HEAD(&pcpu_slot[i]); |
| 1768 | |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1769 | /* |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 1770 | * The end of the static region needs to be aligned with the |
| 1771 | * minimum allocation size as this offsets the reserved and |
| 1772 | * dynamic region. The first chunk ends page aligned by |
| 1773 | * expanding the dynamic region, therefore the dynamic region |
| 1774 | * can be shrunk to compensate while still staying above the |
| 1775 | * configured sizes. |
| 1776 | */ |
| 1777 | static_size = ALIGN(ai->static_size, PCPU_MIN_ALLOC_SIZE); |
| 1778 | dyn_size = ai->dyn_size - (static_size - ai->static_size); |
| 1779 | |
| 1780 | /* |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1781 | * Initialize first chunk. |
| 1782 | * If the reserved_size is non-zero, this initializes the reserved |
| 1783 | * chunk. If the reserved_size is zero, the reserved chunk is NULL |
| 1784 | * and the dynamic region is initialized here. The first chunk, |
| 1785 | * pcpu_first_chunk, will always point to the chunk that serves |
| 1786 | * the dynamic region. |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1787 | */ |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 1788 | tmp_addr = (unsigned long)base_addr + static_size; |
| 1789 | map_size = ai->reserved_size ?: dyn_size; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1790 | chunk = pcpu_alloc_first_chunk(tmp_addr, map_size, smap, |
Dennis Zhou (Facebook) | 0c4169c | 2017-07-24 19:02:04 -0400 | [diff] [blame] | 1791 | ARRAY_SIZE(smap)); |
Tejun Heo | 61ace7f | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1792 | |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1793 | /* init dynamic chunk if necessary */ |
Dennis Zhou (Facebook) | b9c3944 | 2017-07-24 19:02:01 -0400 | [diff] [blame] | 1794 | if (ai->reserved_size) { |
Dennis Zhou (Facebook) | 0c4169c | 2017-07-24 19:02:04 -0400 | [diff] [blame] | 1795 | pcpu_reserved_chunk = chunk; |
Dennis Zhou (Facebook) | b9c3944 | 2017-07-24 19:02:01 -0400 | [diff] [blame] | 1796 | |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 1797 | tmp_addr = (unsigned long)base_addr + static_size + |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1798 | ai->reserved_size; |
Dennis Zhou (Facebook) | d2f3c38 | 2017-07-24 19:02:09 -0400 | [diff] [blame] | 1799 | map_size = dyn_size; |
Dennis Zhou (Facebook) | c0ebfdc | 2017-07-24 19:02:05 -0400 | [diff] [blame] | 1800 | chunk = pcpu_alloc_first_chunk(tmp_addr, map_size, dmap, |
Dennis Zhou (Facebook) | 0c4169c | 2017-07-24 19:02:04 -0400 | [diff] [blame] | 1801 | ARRAY_SIZE(dmap)); |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1802 | } |
| 1803 | |
Tejun Heo | 2441d15 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 1804 | /* link the first chunk in */ |
Dennis Zhou (Facebook) | 0c4169c | 2017-07-24 19:02:04 -0400 | [diff] [blame] | 1805 | pcpu_first_chunk = chunk; |
Dennis Zhou (Facebook) | 0cecf50 | 2017-07-24 19:02:08 -0400 | [diff] [blame] | 1806 | pcpu_nr_empty_pop_pages = pcpu_first_chunk->nr_empty_pop_pages; |
Tejun Heo | ae9e6bc9 | 2009-04-02 13:19:54 +0900 | [diff] [blame] | 1807 | pcpu_chunk_relocate(pcpu_first_chunk, -1); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1808 | |
Dennis Zhou | 30a5b53 | 2017-06-19 19:28:31 -0400 | [diff] [blame] | 1809 | pcpu_stats_chunk_alloc(); |
Dennis Zhou | df95e79 | 2017-06-19 19:28:32 -0400 | [diff] [blame] | 1810 | trace_percpu_create_chunk(base_addr); |
Dennis Zhou | 30a5b53 | 2017-06-19 19:28:31 -0400 | [diff] [blame] | 1811 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1812 | /* we're done */ |
Tejun Heo | bba174f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1813 | pcpu_base_addr = base_addr; |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 1814 | return 0; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1815 | } |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 1816 | |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 1817 | #ifdef CONFIG_SMP |
| 1818 | |
Andi Kleen | 17f3609 | 2012-10-04 17:12:07 -0700 | [diff] [blame] | 1819 | const char * const pcpu_fc_names[PCPU_FC_NR] __initconst = { |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 1820 | [PCPU_FC_AUTO] = "auto", |
| 1821 | [PCPU_FC_EMBED] = "embed", |
| 1822 | [PCPU_FC_PAGE] = "page", |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 1823 | }; |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 1824 | |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 1825 | enum pcpu_fc pcpu_chosen_fc __initdata = PCPU_FC_AUTO; |
| 1826 | |
| 1827 | static int __init percpu_alloc_setup(char *str) |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 1828 | { |
Cyrill Gorcunov | 5479c78 | 2012-11-25 01:17:13 +0400 | [diff] [blame] | 1829 | if (!str) |
| 1830 | return -EINVAL; |
| 1831 | |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 1832 | if (0) |
| 1833 | /* nada */; |
| 1834 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
| 1835 | else if (!strcmp(str, "embed")) |
| 1836 | pcpu_chosen_fc = PCPU_FC_EMBED; |
| 1837 | #endif |
| 1838 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
| 1839 | else if (!strcmp(str, "page")) |
| 1840 | pcpu_chosen_fc = PCPU_FC_PAGE; |
| 1841 | #endif |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 1842 | else |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 1843 | pr_warn("unknown allocator %s specified\n", str); |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 1844 | |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 1845 | return 0; |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 1846 | } |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 1847 | early_param("percpu_alloc", percpu_alloc_setup); |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 1848 | |
Tejun Heo | 3c9a024 | 2010-09-09 18:00:15 +0200 | [diff] [blame] | 1849 | /* |
| 1850 | * pcpu_embed_first_chunk() is used by the generic percpu setup. |
| 1851 | * Build it if needed by the arch config or the generic setup is going |
| 1852 | * to be used. |
| 1853 | */ |
Tejun Heo | 08fc458 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 1854 | #if defined(CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK) || \ |
| 1855 | !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
Tejun Heo | 3c9a024 | 2010-09-09 18:00:15 +0200 | [diff] [blame] | 1856 | #define BUILD_EMBED_FIRST_CHUNK |
| 1857 | #endif |
| 1858 | |
| 1859 | /* build pcpu_page_first_chunk() iff needed by the arch config */ |
| 1860 | #if defined(CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK) |
| 1861 | #define BUILD_PAGE_FIRST_CHUNK |
| 1862 | #endif |
| 1863 | |
| 1864 | /* pcpu_build_alloc_info() is used by both embed and page first chunk */ |
| 1865 | #if defined(BUILD_EMBED_FIRST_CHUNK) || defined(BUILD_PAGE_FIRST_CHUNK) |
| 1866 | /** |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1867 | * pcpu_build_alloc_info - build alloc_info considering distances between CPUs |
| 1868 | * @reserved_size: the size of reserved percpu area in bytes |
| 1869 | * @dyn_size: minimum free size for dynamic allocation in bytes |
| 1870 | * @atom_size: allocation atom size |
| 1871 | * @cpu_distance_fn: callback to determine distance between cpus, optional |
| 1872 | * |
| 1873 | * This function determines grouping of units, their mappings to cpus |
| 1874 | * and other parameters considering needed percpu size, allocation |
| 1875 | * atom size and distances between CPUs. |
| 1876 | * |
Yannick Guerrini | bffc437 | 2015-03-06 23:30:42 +0100 | [diff] [blame] | 1877 | * Groups are always multiples of atom size and CPUs which are of |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1878 | * LOCAL_DISTANCE both ways are grouped together and share space for |
| 1879 | * units in the same group. The returned configuration is guaranteed |
| 1880 | * to have CPUs on different nodes on different groups and >=75% usage |
| 1881 | * of allocated virtual address space. |
| 1882 | * |
| 1883 | * RETURNS: |
| 1884 | * On success, pointer to the new allocation_info is returned. On |
| 1885 | * failure, ERR_PTR value is returned. |
| 1886 | */ |
| 1887 | static struct pcpu_alloc_info * __init pcpu_build_alloc_info( |
| 1888 | size_t reserved_size, size_t dyn_size, |
| 1889 | size_t atom_size, |
| 1890 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn) |
| 1891 | { |
| 1892 | static int group_map[NR_CPUS] __initdata; |
| 1893 | static int group_cnt[NR_CPUS] __initdata; |
| 1894 | const size_t static_size = __per_cpu_end - __per_cpu_start; |
| 1895 | int nr_groups = 1, nr_units = 0; |
| 1896 | size_t size_sum, min_unit_size, alloc_size; |
| 1897 | int upa, max_upa, uninitialized_var(best_upa); /* units_per_alloc */ |
| 1898 | int last_allocs, group, unit; |
| 1899 | unsigned int cpu, tcpu; |
| 1900 | struct pcpu_alloc_info *ai; |
| 1901 | unsigned int *cpu_map; |
| 1902 | |
| 1903 | /* this function may be called multiple times */ |
| 1904 | memset(group_map, 0, sizeof(group_map)); |
| 1905 | memset(group_cnt, 0, sizeof(group_cnt)); |
| 1906 | |
| 1907 | /* calculate size_sum and ensure dyn_size is enough for early alloc */ |
| 1908 | size_sum = PFN_ALIGN(static_size + reserved_size + |
| 1909 | max_t(size_t, dyn_size, PERCPU_DYNAMIC_EARLY_SIZE)); |
| 1910 | dyn_size = size_sum - static_size - reserved_size; |
| 1911 | |
| 1912 | /* |
| 1913 | * Determine min_unit_size, alloc_size and max_upa such that |
| 1914 | * alloc_size is multiple of atom_size and is the smallest |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1915 | * which can accommodate 4k aligned segments which are equal to |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1916 | * or larger than min_unit_size. |
| 1917 | */ |
| 1918 | min_unit_size = max_t(size_t, size_sum, PCPU_MIN_UNIT_SIZE); |
| 1919 | |
Dennis Zhou (Facebook) | 9c01516 | 2017-07-15 22:23:09 -0400 | [diff] [blame] | 1920 | /* determine the maximum # of units that can fit in an allocation */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1921 | alloc_size = roundup(min_unit_size, atom_size); |
| 1922 | upa = alloc_size / min_unit_size; |
Alexander Kuleshov | f09f124 | 2015-11-05 18:46:43 -0800 | [diff] [blame] | 1923 | while (alloc_size % upa || (offset_in_page(alloc_size / upa))) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1924 | upa--; |
| 1925 | max_upa = upa; |
| 1926 | |
| 1927 | /* group cpus according to their proximity */ |
| 1928 | for_each_possible_cpu(cpu) { |
| 1929 | group = 0; |
| 1930 | next_group: |
| 1931 | for_each_possible_cpu(tcpu) { |
| 1932 | if (cpu == tcpu) |
| 1933 | break; |
| 1934 | if (group_map[tcpu] == group && cpu_distance_fn && |
| 1935 | (cpu_distance_fn(cpu, tcpu) > LOCAL_DISTANCE || |
| 1936 | cpu_distance_fn(tcpu, cpu) > LOCAL_DISTANCE)) { |
| 1937 | group++; |
| 1938 | nr_groups = max(nr_groups, group + 1); |
| 1939 | goto next_group; |
| 1940 | } |
| 1941 | } |
| 1942 | group_map[cpu] = group; |
| 1943 | group_cnt[group]++; |
| 1944 | } |
| 1945 | |
| 1946 | /* |
Dennis Zhou (Facebook) | 9c01516 | 2017-07-15 22:23:09 -0400 | [diff] [blame] | 1947 | * Wasted space is caused by a ratio imbalance of upa to group_cnt. |
| 1948 | * Expand the unit_size until we use >= 75% of the units allocated. |
| 1949 | * Related to atom_size, which could be much larger than the unit_size. |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1950 | */ |
| 1951 | last_allocs = INT_MAX; |
| 1952 | for (upa = max_upa; upa; upa--) { |
| 1953 | int allocs = 0, wasted = 0; |
| 1954 | |
Alexander Kuleshov | f09f124 | 2015-11-05 18:46:43 -0800 | [diff] [blame] | 1955 | if (alloc_size % upa || (offset_in_page(alloc_size / upa))) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 1956 | continue; |
| 1957 | |
| 1958 | for (group = 0; group < nr_groups; group++) { |
| 1959 | int this_allocs = DIV_ROUND_UP(group_cnt[group], upa); |
| 1960 | allocs += this_allocs; |
| 1961 | wasted += this_allocs * upa - group_cnt[group]; |
| 1962 | } |
| 1963 | |
| 1964 | /* |
| 1965 | * Don't accept if wastage is over 1/3. The |
| 1966 | * greater-than comparison ensures upa==1 always |
| 1967 | * passes the following check. |
| 1968 | */ |
| 1969 | if (wasted > num_possible_cpus() / 3) |
| 1970 | continue; |
| 1971 | |
| 1972 | /* and then don't consume more memory */ |
| 1973 | if (allocs > last_allocs) |
| 1974 | break; |
| 1975 | last_allocs = allocs; |
| 1976 | best_upa = upa; |
| 1977 | } |
| 1978 | upa = best_upa; |
| 1979 | |
| 1980 | /* allocate and fill alloc_info */ |
| 1981 | for (group = 0; group < nr_groups; group++) |
| 1982 | nr_units += roundup(group_cnt[group], upa); |
| 1983 | |
| 1984 | ai = pcpu_alloc_alloc_info(nr_groups, nr_units); |
| 1985 | if (!ai) |
| 1986 | return ERR_PTR(-ENOMEM); |
| 1987 | cpu_map = ai->groups[0].cpu_map; |
| 1988 | |
| 1989 | for (group = 0; group < nr_groups; group++) { |
| 1990 | ai->groups[group].cpu_map = cpu_map; |
| 1991 | cpu_map += roundup(group_cnt[group], upa); |
| 1992 | } |
| 1993 | |
| 1994 | ai->static_size = static_size; |
| 1995 | ai->reserved_size = reserved_size; |
| 1996 | ai->dyn_size = dyn_size; |
| 1997 | ai->unit_size = alloc_size / upa; |
| 1998 | ai->atom_size = atom_size; |
| 1999 | ai->alloc_size = alloc_size; |
| 2000 | |
| 2001 | for (group = 0, unit = 0; group_cnt[group]; group++) { |
| 2002 | struct pcpu_group_info *gi = &ai->groups[group]; |
| 2003 | |
| 2004 | /* |
| 2005 | * Initialize base_offset as if all groups are located |
| 2006 | * back-to-back. The caller should update this to |
| 2007 | * reflect actual allocation. |
| 2008 | */ |
| 2009 | gi->base_offset = unit * ai->unit_size; |
| 2010 | |
| 2011 | for_each_possible_cpu(cpu) |
| 2012 | if (group_map[cpu] == group) |
| 2013 | gi->cpu_map[gi->nr_units++] = cpu; |
| 2014 | gi->nr_units = roundup(gi->nr_units, upa); |
| 2015 | unit += gi->nr_units; |
| 2016 | } |
| 2017 | BUG_ON(unit != nr_units); |
| 2018 | |
| 2019 | return ai; |
| 2020 | } |
Tejun Heo | 3c9a024 | 2010-09-09 18:00:15 +0200 | [diff] [blame] | 2021 | #endif /* BUILD_EMBED_FIRST_CHUNK || BUILD_PAGE_FIRST_CHUNK */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 2022 | |
Tejun Heo | 3c9a024 | 2010-09-09 18:00:15 +0200 | [diff] [blame] | 2023 | #if defined(BUILD_EMBED_FIRST_CHUNK) |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2024 | /** |
| 2025 | * pcpu_embed_first_chunk - embed the first percpu chunk into bootmem |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2026 | * @reserved_size: the size of reserved percpu area in bytes |
Tejun Heo | 4ba6ce2 | 2010-06-27 18:49:59 +0200 | [diff] [blame] | 2027 | * @dyn_size: minimum free size for dynamic allocation in bytes |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2028 | * @atom_size: allocation atom size |
| 2029 | * @cpu_distance_fn: callback to determine distance between cpus, optional |
| 2030 | * @alloc_fn: function to allocate percpu page |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2031 | * @free_fn: function to free percpu page |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2032 | * |
| 2033 | * This is a helper to ease setting up embedded first percpu chunk and |
| 2034 | * can be called where pcpu_setup_first_chunk() is expected. |
| 2035 | * |
| 2036 | * If this function is used to setup the first chunk, it is allocated |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2037 | * by calling @alloc_fn and used as-is without being mapped into |
| 2038 | * vmalloc area. Allocations are always whole multiples of @atom_size |
| 2039 | * aligned to @atom_size. |
| 2040 | * |
| 2041 | * This enables the first chunk to piggy back on the linear physical |
| 2042 | * mapping which often uses larger page size. Please note that this |
| 2043 | * can result in very sparse cpu->unit mapping on NUMA machines thus |
| 2044 | * requiring large vmalloc address space. Don't use this allocator if |
| 2045 | * vmalloc space is not orders of magnitude larger than distances |
| 2046 | * between node memory addresses (ie. 32bit NUMA machines). |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2047 | * |
Tejun Heo | 4ba6ce2 | 2010-06-27 18:49:59 +0200 | [diff] [blame] | 2048 | * @dyn_size specifies the minimum dynamic area size. |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2049 | * |
| 2050 | * If the needed size is smaller than the minimum or specified unit |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2051 | * size, the leftover is returned using @free_fn. |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2052 | * |
| 2053 | * RETURNS: |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2054 | * 0 on success, -errno on failure. |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2055 | */ |
Tejun Heo | 4ba6ce2 | 2010-06-27 18:49:59 +0200 | [diff] [blame] | 2056 | int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2057 | size_t atom_size, |
| 2058 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, |
| 2059 | pcpu_fc_alloc_fn_t alloc_fn, |
| 2060 | pcpu_fc_free_fn_t free_fn) |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2061 | { |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2062 | void *base = (void *)ULONG_MAX; |
| 2063 | void **areas = NULL; |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2064 | struct pcpu_alloc_info *ai; |
zijun_hu | 93c76b6b | 2016-10-05 21:19:11 +0800 | [diff] [blame] | 2065 | size_t size_sum, areas_size; |
| 2066 | unsigned long max_distance; |
zijun_hu | 9b73966 | 2016-10-05 21:30:24 +0800 | [diff] [blame] | 2067 | int group, i, highest_group, rc; |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2068 | |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2069 | ai = pcpu_build_alloc_info(reserved_size, dyn_size, atom_size, |
| 2070 | cpu_distance_fn); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2071 | if (IS_ERR(ai)) |
| 2072 | return PTR_ERR(ai); |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2073 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2074 | size_sum = ai->static_size + ai->reserved_size + ai->dyn_size; |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2075 | areas_size = PFN_ALIGN(ai->nr_groups * sizeof(void *)); |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2076 | |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 2077 | areas = memblock_virt_alloc_nopanic(areas_size, 0); |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2078 | if (!areas) { |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2079 | rc = -ENOMEM; |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2080 | goto out_free; |
Tejun Heo | fa8a709 | 2009-06-22 11:56:24 +0900 | [diff] [blame] | 2081 | } |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2082 | |
zijun_hu | 9b73966 | 2016-10-05 21:30:24 +0800 | [diff] [blame] | 2083 | /* allocate, copy and determine base address & max_distance */ |
| 2084 | highest_group = 0; |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2085 | for (group = 0; group < ai->nr_groups; group++) { |
| 2086 | struct pcpu_group_info *gi = &ai->groups[group]; |
| 2087 | unsigned int cpu = NR_CPUS; |
| 2088 | void *ptr; |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2089 | |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2090 | for (i = 0; i < gi->nr_units && cpu == NR_CPUS; i++) |
| 2091 | cpu = gi->cpu_map[i]; |
| 2092 | BUG_ON(cpu == NR_CPUS); |
| 2093 | |
| 2094 | /* allocate space for the whole group */ |
| 2095 | ptr = alloc_fn(cpu, gi->nr_units * ai->unit_size, atom_size); |
| 2096 | if (!ptr) { |
| 2097 | rc = -ENOMEM; |
| 2098 | goto out_free_areas; |
| 2099 | } |
Catalin Marinas | f528f0b | 2011-09-26 17:12:53 +0100 | [diff] [blame] | 2100 | /* kmemleak tracks the percpu allocations separately */ |
| 2101 | kmemleak_free(ptr); |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2102 | areas[group] = ptr; |
| 2103 | |
| 2104 | base = min(ptr, base); |
zijun_hu | 9b73966 | 2016-10-05 21:30:24 +0800 | [diff] [blame] | 2105 | if (ptr > areas[highest_group]) |
| 2106 | highest_group = group; |
| 2107 | } |
| 2108 | max_distance = areas[highest_group] - base; |
| 2109 | max_distance += ai->unit_size * ai->groups[highest_group].nr_units; |
| 2110 | |
| 2111 | /* warn if maximum distance is further than 75% of vmalloc space */ |
| 2112 | if (max_distance > VMALLOC_TOTAL * 3 / 4) { |
| 2113 | pr_warn("max_distance=0x%lx too large for vmalloc space 0x%lx\n", |
| 2114 | max_distance, VMALLOC_TOTAL); |
| 2115 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
| 2116 | /* and fail if we have fallback */ |
| 2117 | rc = -EINVAL; |
| 2118 | goto out_free_areas; |
| 2119 | #endif |
Tejun Heo | 42b6428 | 2012-04-27 08:42:53 -0700 | [diff] [blame] | 2120 | } |
| 2121 | |
| 2122 | /* |
| 2123 | * Copy data and free unused parts. This should happen after all |
| 2124 | * allocations are complete; otherwise, we may end up with |
| 2125 | * overlapping groups. |
| 2126 | */ |
| 2127 | for (group = 0; group < ai->nr_groups; group++) { |
| 2128 | struct pcpu_group_info *gi = &ai->groups[group]; |
| 2129 | void *ptr = areas[group]; |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2130 | |
| 2131 | for (i = 0; i < gi->nr_units; i++, ptr += ai->unit_size) { |
| 2132 | if (gi->cpu_map[i] == NR_CPUS) { |
| 2133 | /* unused unit, free whole */ |
| 2134 | free_fn(ptr, ai->unit_size); |
| 2135 | continue; |
| 2136 | } |
| 2137 | /* copy and return the unused part */ |
| 2138 | memcpy(ptr, __per_cpu_load, ai->static_size); |
| 2139 | free_fn(ptr + size_sum, ai->unit_size - size_sum); |
| 2140 | } |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2141 | } |
| 2142 | |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2143 | /* base address is now known, determine group base offsets */ |
Tejun Heo | 6ea529a | 2009-09-24 18:46:01 +0900 | [diff] [blame] | 2144 | for (group = 0; group < ai->nr_groups; group++) { |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2145 | ai->groups[group].base_offset = areas[group] - base; |
Tejun Heo | 6ea529a | 2009-09-24 18:46:01 +0900 | [diff] [blame] | 2146 | } |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2147 | |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 2148 | pr_info("Embedded %zu pages/cpu @%p s%zu r%zu d%zu u%zu\n", |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2149 | PFN_DOWN(size_sum), base, ai->static_size, ai->reserved_size, |
| 2150 | ai->dyn_size, ai->unit_size); |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2151 | |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2152 | rc = pcpu_setup_first_chunk(ai, base); |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2153 | goto out_free; |
| 2154 | |
| 2155 | out_free_areas: |
| 2156 | for (group = 0; group < ai->nr_groups; group++) |
Michael Holzheu | f851c8d | 2013-09-17 16:57:34 +0200 | [diff] [blame] | 2157 | if (areas[group]) |
| 2158 | free_fn(areas[group], |
| 2159 | ai->groups[group].nr_units * ai->unit_size); |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2160 | out_free: |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2161 | pcpu_free_alloc_info(ai); |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2162 | if (areas) |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 2163 | memblock_free_early(__pa(areas), areas_size); |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2164 | return rc; |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2165 | } |
Tejun Heo | 3c9a024 | 2010-09-09 18:00:15 +0200 | [diff] [blame] | 2166 | #endif /* BUILD_EMBED_FIRST_CHUNK */ |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2167 | |
Tejun Heo | 3c9a024 | 2010-09-09 18:00:15 +0200 | [diff] [blame] | 2168 | #ifdef BUILD_PAGE_FIRST_CHUNK |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2169 | /** |
Tejun Heo | 00ae406 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 2170 | * pcpu_page_first_chunk - map the first chunk using PAGE_SIZE pages |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2171 | * @reserved_size: the size of reserved percpu area in bytes |
| 2172 | * @alloc_fn: function to allocate percpu page, always called with PAGE_SIZE |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2173 | * @free_fn: function to free percpu page, always called with PAGE_SIZE |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2174 | * @populate_pte_fn: function to populate pte |
| 2175 | * |
Tejun Heo | 00ae406 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 2176 | * This is a helper to ease setting up page-remapped first percpu |
| 2177 | * chunk and can be called where pcpu_setup_first_chunk() is expected. |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2178 | * |
| 2179 | * This is the basic allocator. Static percpu area is allocated |
| 2180 | * page-by-page into vmalloc area. |
| 2181 | * |
| 2182 | * RETURNS: |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2183 | * 0 on success, -errno on failure. |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2184 | */ |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2185 | int __init pcpu_page_first_chunk(size_t reserved_size, |
| 2186 | pcpu_fc_alloc_fn_t alloc_fn, |
| 2187 | pcpu_fc_free_fn_t free_fn, |
| 2188 | pcpu_fc_populate_pte_fn_t populate_pte_fn) |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2189 | { |
Tejun Heo | 8f05a6a | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2190 | static struct vm_struct vm; |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2191 | struct pcpu_alloc_info *ai; |
Tejun Heo | 00ae406 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 2192 | char psize_str[16]; |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 2193 | int unit_pages; |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2194 | size_t pages_size; |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 2195 | struct page **pages; |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2196 | int unit, i, j, rc; |
zijun_hu | 8f60660 | 2016-12-12 16:45:02 -0800 | [diff] [blame] | 2197 | int upa; |
| 2198 | int nr_g0_units; |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2199 | |
Tejun Heo | 00ae406 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 2200 | snprintf(psize_str, sizeof(psize_str), "%luK", PAGE_SIZE >> 10); |
| 2201 | |
Tejun Heo | 4ba6ce2 | 2010-06-27 18:49:59 +0200 | [diff] [blame] | 2202 | ai = pcpu_build_alloc_info(reserved_size, 0, PAGE_SIZE, NULL); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2203 | if (IS_ERR(ai)) |
| 2204 | return PTR_ERR(ai); |
| 2205 | BUG_ON(ai->nr_groups != 1); |
zijun_hu | 8f60660 | 2016-12-12 16:45:02 -0800 | [diff] [blame] | 2206 | upa = ai->alloc_size/ai->unit_size; |
| 2207 | nr_g0_units = roundup(num_possible_cpus(), upa); |
| 2208 | if (unlikely(WARN_ON(ai->groups[0].nr_units != nr_g0_units))) { |
| 2209 | pcpu_free_alloc_info(ai); |
| 2210 | return -EINVAL; |
| 2211 | } |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2212 | |
| 2213 | unit_pages = ai->unit_size >> PAGE_SHIFT; |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2214 | |
| 2215 | /* unaligned allocations can't be freed, round up to page size */ |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2216 | pages_size = PFN_ALIGN(unit_pages * num_possible_cpus() * |
| 2217 | sizeof(pages[0])); |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 2218 | pages = memblock_virt_alloc(pages_size, 0); |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2219 | |
Tejun Heo | 8f05a6a | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2220 | /* allocate pages */ |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2221 | j = 0; |
zijun_hu | 8f60660 | 2016-12-12 16:45:02 -0800 | [diff] [blame] | 2222 | for (unit = 0; unit < num_possible_cpus(); unit++) { |
| 2223 | unsigned int cpu = ai->groups[0].cpu_map[unit]; |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 2224 | for (i = 0; i < unit_pages; i++) { |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2225 | void *ptr; |
| 2226 | |
Tejun Heo | 3cbc856 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 2227 | ptr = alloc_fn(cpu, PAGE_SIZE, PAGE_SIZE); |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2228 | if (!ptr) { |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 2229 | pr_warn("failed to allocate %s page for cpu%u\n", |
zijun_hu | 8f60660 | 2016-12-12 16:45:02 -0800 | [diff] [blame] | 2230 | psize_str, cpu); |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2231 | goto enomem; |
| 2232 | } |
Catalin Marinas | f528f0b | 2011-09-26 17:12:53 +0100 | [diff] [blame] | 2233 | /* kmemleak tracks the percpu allocations separately */ |
| 2234 | kmemleak_free(ptr); |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 2235 | pages[j++] = virt_to_page(ptr); |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2236 | } |
zijun_hu | 8f60660 | 2016-12-12 16:45:02 -0800 | [diff] [blame] | 2237 | } |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2238 | |
Tejun Heo | 8f05a6a | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2239 | /* allocate vm area, map the pages and copy static data */ |
| 2240 | vm.flags = VM_ALLOC; |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2241 | vm.size = num_possible_cpus() * ai->unit_size; |
Tejun Heo | 8f05a6a | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2242 | vm_area_register_early(&vm, PAGE_SIZE); |
| 2243 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2244 | for (unit = 0; unit < num_possible_cpus(); unit++) { |
Tejun Heo | 1d9d325 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 2245 | unsigned long unit_addr = |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2246 | (unsigned long)vm.addr + unit * ai->unit_size; |
Tejun Heo | 8f05a6a | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2247 | |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 2248 | for (i = 0; i < unit_pages; i++) |
Tejun Heo | 8f05a6a | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2249 | populate_pte_fn(unit_addr + (i << PAGE_SHIFT)); |
| 2250 | |
| 2251 | /* pte already populated, the following shouldn't fail */ |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2252 | rc = __pcpu_map_pages(unit_addr, &pages[unit * unit_pages], |
| 2253 | unit_pages); |
| 2254 | if (rc < 0) |
| 2255 | panic("failed to map percpu area, err=%d\n", rc); |
Tejun Heo | 8f05a6a | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2256 | |
| 2257 | /* |
| 2258 | * FIXME: Archs with virtual cache should flush local |
| 2259 | * cache for the linear mapping here - something |
| 2260 | * equivalent to flush_cache_vmap() on the local cpu. |
| 2261 | * flush_cache_vmap() can't be used as most supporting |
| 2262 | * data structures are not set up yet. |
| 2263 | */ |
| 2264 | |
| 2265 | /* copy static data */ |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2266 | memcpy((void *)unit_addr, __per_cpu_load, ai->static_size); |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2267 | } |
| 2268 | |
| 2269 | /* we're ready, commit */ |
Joe Perches | 870d4b1 | 2016-03-17 14:19:53 -0700 | [diff] [blame] | 2270 | pr_info("%d %s pages/cpu @%p s%zu r%zu d%zu\n", |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2271 | unit_pages, psize_str, vm.addr, ai->static_size, |
| 2272 | ai->reserved_size, ai->dyn_size); |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2273 | |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2274 | rc = pcpu_setup_first_chunk(ai, vm.addr); |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2275 | goto out_free_ar; |
| 2276 | |
| 2277 | enomem: |
| 2278 | while (--j >= 0) |
Tejun Heo | ce3141a | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 2279 | free_fn(page_address(pages[j]), PAGE_SIZE); |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2280 | rc = -ENOMEM; |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2281 | out_free_ar: |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 2282 | memblock_free_early(__pa(pages), pages_size); |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2283 | pcpu_free_alloc_info(ai); |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2284 | return rc; |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 2285 | } |
Tejun Heo | 3c9a024 | 2010-09-09 18:00:15 +0200 | [diff] [blame] | 2286 | #endif /* BUILD_PAGE_FIRST_CHUNK */ |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2287 | |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 2288 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA |
Tejun Heo | 8c4bfc6 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 2289 | /* |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 2290 | * Generic SMP percpu area setup. |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 2291 | * |
| 2292 | * The embedding helper is used because its behavior closely resembles |
| 2293 | * the original non-dynamic generic percpu area setup. This is |
| 2294 | * important because many archs have addressing restrictions and might |
| 2295 | * fail if the percpu area is located far away from the previous |
| 2296 | * location. As an added bonus, in non-NUMA cases, embedding is |
| 2297 | * generally a good idea TLB-wise because percpu area can piggy back |
| 2298 | * on the physical linear memory mapping which uses large page |
| 2299 | * mappings on applicable archs. |
| 2300 | */ |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 2301 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; |
| 2302 | EXPORT_SYMBOL(__per_cpu_offset); |
| 2303 | |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2304 | static void * __init pcpu_dfl_fc_alloc(unsigned int cpu, size_t size, |
| 2305 | size_t align) |
| 2306 | { |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 2307 | return memblock_virt_alloc_from_nopanic( |
| 2308 | size, align, __pa(MAX_DMA_ADDRESS)); |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2309 | } |
| 2310 | |
| 2311 | static void __init pcpu_dfl_fc_free(void *ptr, size_t size) |
| 2312 | { |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 2313 | memblock_free_early(__pa(ptr), size); |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2314 | } |
| 2315 | |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 2316 | void __init setup_per_cpu_areas(void) |
| 2317 | { |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 2318 | unsigned long delta; |
| 2319 | unsigned int cpu; |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2320 | int rc; |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 2321 | |
| 2322 | /* |
| 2323 | * Always reserve area for module percpu variables. That's |
| 2324 | * what the legacy allocator did. |
| 2325 | */ |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2326 | rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 2327 | PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, NULL, |
| 2328 | pcpu_dfl_fc_alloc, pcpu_dfl_fc_free); |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2329 | if (rc < 0) |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 2330 | panic("Failed to initialize percpu areas."); |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 2331 | |
| 2332 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; |
| 2333 | for_each_possible_cpu(cpu) |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 2334 | __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 2335 | } |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 2336 | #endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */ |
| 2337 | |
| 2338 | #else /* CONFIG_SMP */ |
| 2339 | |
| 2340 | /* |
| 2341 | * UP percpu area setup. |
| 2342 | * |
| 2343 | * UP always uses km-based percpu allocator with identity mapping. |
| 2344 | * Static percpu variables are indistinguishable from the usual static |
| 2345 | * variables and don't require any special preparation. |
| 2346 | */ |
| 2347 | void __init setup_per_cpu_areas(void) |
| 2348 | { |
| 2349 | const size_t unit_size = |
| 2350 | roundup_pow_of_two(max_t(size_t, PCPU_MIN_UNIT_SIZE, |
| 2351 | PERCPU_DYNAMIC_RESERVE)); |
| 2352 | struct pcpu_alloc_info *ai; |
| 2353 | void *fc; |
| 2354 | |
| 2355 | ai = pcpu_alloc_alloc_info(1, 1); |
Santosh Shilimkar | 999c17e | 2014-01-21 15:50:40 -0800 | [diff] [blame] | 2356 | fc = memblock_virt_alloc_from_nopanic(unit_size, |
| 2357 | PAGE_SIZE, |
| 2358 | __pa(MAX_DMA_ADDRESS)); |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 2359 | if (!ai || !fc) |
| 2360 | panic("Failed to allocate memory for percpu areas."); |
Catalin Marinas | 100d13c | 2012-05-09 16:55:19 +0100 | [diff] [blame] | 2361 | /* kmemleak tracks the percpu allocations separately */ |
| 2362 | kmemleak_free(fc); |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 2363 | |
| 2364 | ai->dyn_size = unit_size; |
| 2365 | ai->unit_size = unit_size; |
| 2366 | ai->atom_size = unit_size; |
| 2367 | ai->alloc_size = unit_size; |
| 2368 | ai->groups[0].nr_units = 1; |
| 2369 | ai->groups[0].cpu_map[0] = 0; |
| 2370 | |
| 2371 | if (pcpu_setup_first_chunk(ai, fc) < 0) |
| 2372 | panic("Failed to initialize percpu areas."); |
| 2373 | } |
| 2374 | |
| 2375 | #endif /* CONFIG_SMP */ |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 2376 | |
| 2377 | /* |
| 2378 | * First and reserved chunks are initialized with temporary allocation |
| 2379 | * map in initdata so that they can be used before slab is online. |
| 2380 | * This function is called after slab is brought up and replaces those |
| 2381 | * with properly allocated maps. |
| 2382 | */ |
| 2383 | void __init percpu_init_late(void) |
| 2384 | { |
| 2385 | struct pcpu_chunk *target_chunks[] = |
| 2386 | { pcpu_first_chunk, pcpu_reserved_chunk, NULL }; |
| 2387 | struct pcpu_chunk *chunk; |
| 2388 | unsigned long flags; |
| 2389 | int i; |
| 2390 | |
| 2391 | for (i = 0; (chunk = target_chunks[i]); i++) { |
| 2392 | int *map; |
| 2393 | const size_t size = PERCPU_DYNAMIC_EARLY_SLOTS * sizeof(map[0]); |
| 2394 | |
| 2395 | BUILD_BUG_ON(size > PAGE_SIZE); |
| 2396 | |
Bob Liu | 90459ce0 | 2011-08-04 11:02:33 +0200 | [diff] [blame] | 2397 | map = pcpu_mem_zalloc(size); |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 2398 | BUG_ON(!map); |
| 2399 | |
| 2400 | spin_lock_irqsave(&pcpu_lock, flags); |
| 2401 | memcpy(map, chunk->map, size); |
| 2402 | chunk->map = map; |
| 2403 | spin_unlock_irqrestore(&pcpu_lock, flags); |
| 2404 | } |
| 2405 | } |
Tejun Heo | 1a4d760 | 2014-09-02 14:46:05 -0400 | [diff] [blame] | 2406 | |
| 2407 | /* |
| 2408 | * Percpu allocator is initialized early during boot when neither slab or |
| 2409 | * workqueue is available. Plug async management until everything is up |
| 2410 | * and running. |
| 2411 | */ |
| 2412 | static int __init percpu_enable_async(void) |
| 2413 | { |
| 2414 | pcpu_async_enabled = true; |
| 2415 | return 0; |
| 2416 | } |
| 2417 | subsys_initcall(percpu_enable_async); |