mm/nobootmem.c

   1 /*
   2  *  bootmem - A boot-time physical memory allocator and configurator
   3  *
   4  *  Copyright (C) 1999 Ingo Molnar
   5  *                1999 Kanoj Sarcar, SGI
   6  *                2008 Johannes Weiner
   7  *
   8  * Access to this subsystem has to be serialized externally (which is true
   9  * for the boot process anyway).
  10  */
  11 #include <linux/init.h>
  12 #include <linux/pfn.h>
  13 #include <linux/slab.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/export.h>
  16 #include <linux/kmemleak.h>
  17 #include <linux/range.h>
  18 #include <linux/memblock.h>
  19
  20 #include <asm/bug.h>
  21 #include <asm/io.h>
  22 #include <asm/processor.h>
  23
  24 #include "internal.h"
  25
  26 #ifndef CONFIG_NEED_MULTIPLE_NODES
  27 struct pglist_data __refdata contig_page_data;
  28 EXPORT_SYMBOL(contig_page_data);
  29 #endif
  30
  31 unsigned long max_low_pfn;
  32 unsigned long min_low_pfn;
  33 unsigned long max_pfn;
  34 unsigned long long max_possible_pfn;
  35
  36 static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
  37                                         u64 goal, u64 limit)
  38 {
  39         void *ptr;
  40         u64 addr;
  41         ulong flags = choose_memblock_flags();
  42
  43         if (limit > memblock.current_limit)
  44                 limit = memblock.current_limit;
  45
  46 again:
  47         addr = memblock_find_in_range_node(size, align, goal, limit, nid,
  48                                            flags);
  49         if (!addr && (flags & MEMBLOCK_MIRROR)) {
  50                 flags &= ~MEMBLOCK_MIRROR;
  51                 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
  52                         &size);
  53                 goto again;
  54         }
  55         if (!addr)
  56                 return NULL;
  57
  58         if (memblock_reserve(addr, size))
  59                 return NULL;
  60
  61         ptr = phys_to_virt(addr);
  62         memset(ptr, 0, size);
  63         /*
  64          * The min_count is set to 0 so that bootmem allocated blocks
  65          * are never reported as leaks.
  66          */
  67         kmemleak_alloc(ptr, size, 0, 0);
  68         return ptr;
  69 }
  70
  71 /*
  72  * free_bootmem_late - free bootmem pages directly to page allocator
  73  * @addr: starting address of the range
  74  * @size: size of the range in bytes
  75  *
  76  * This is only useful when the bootmem allocator has already been torn
  77  * down, but we are still initializing the system.  Pages are given directly
  78  * to the page allocator, no bootmem metadata is updated because it is gone.
  79  */
  80 void __init free_bootmem_late(unsigned long addr, unsigned long size)
  81 {
  82         unsigned long cursor, end;
  83
  84         kmemleak_free_part(__va(addr), size);
  85
  86         cursor = PFN_UP(addr);
  87         end = PFN_DOWN(addr + size);
  88
  89         for (; cursor < end; cursor++) {
  90                 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
  91                 totalram_pages++;
  92         }
  93 }
  94
  95 static void __init __free_pages_memory(unsigned long start, unsigned long end)
  96 {
  97         int order;
  98
  99         while (start < end) {
 100                 order = min(MAX_ORDER - 1UL, __ffs(start));
 101
 102                 while (start + (1UL << order) > end)
 103                         order--;
 104
 105                 __free_pages_bootmem(pfn_to_page(start), start, order);
 106
 107                 start += (1UL << order);
 108         }
 109 }
 110
 111 static unsigned long __init __free_memory_core(phys_addr_t start,
 112                                  phys_addr_t end)
 113 {
 114         unsigned long start_pfn = PFN_UP(start);
 115         unsigned long end_pfn = min_t(unsigned long,
 116                                       PFN_DOWN(end), max_low_pfn);
 117
 118         if (start_pfn > end_pfn)
 119                 return 0;
 120
 121         __free_pages_memory(start_pfn, end_pfn);
 122
 123         return end_pfn - start_pfn;
 124 }
 125
 126 static unsigned long __init free_low_memory_core_early(void)
 127 {
 128         unsigned long count = 0;
 129         phys_addr_t start, end;
 130         u64 i;
 131
 132         memblock_clear_hotplug(0, -1);
 133
 134         for_each_reserved_mem_region(i, &start, &end)
 135                 reserve_bootmem_region(start, end);
 136
 137         for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
 138                                 NULL)
 139                 count += __free_memory_core(start, end);
 140
 141 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 142         {
 143                 phys_addr_t size;
 144
 145                 /* Free memblock.reserved array if it was allocated */
 146                 size = get_allocated_memblock_reserved_regions_info(&start);
 147                 if (size)
 148                         count += __free_memory_core(start, start + size);
 149
 150                 /* Free memblock.memory array if it was allocated */
 151                 size = get_allocated_memblock_memory_regions_info(&start);
 152                 if (size)
 153                         count += __free_memory_core(start, start + size);
 154         }
 155 #endif
 156
 157         return count;
 158 }
 159
 160 static int reset_managed_pages_done __initdata;
 161
 162 void reset_node_managed_pages(pg_data_t *pgdat)
 163 {
 164         struct zone *z;
 165
 166         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 167                 z->managed_pages = 0;
 168 }
 169
 170 void __init reset_all_zones_managed_pages(void)
 171 {
 172         struct pglist_data *pgdat;
 173
 174         if (reset_managed_pages_done)
 175                 return;
 176
 177         for_each_online_pgdat(pgdat)
 178                 reset_node_managed_pages(pgdat);
 179
 180         reset_managed_pages_done = 1;
 181 }
 182
 183 /**
 184  * free_all_bootmem - release free pages to the buddy allocator
 185  *
 186  * Returns the number of pages actually released.
 187  */
 188 unsigned long __init free_all_bootmem(void)
 189 {
 190         unsigned long pages;
 191
 192         reset_all_zones_managed_pages();
 193
 194         /*
 195          * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
 196          *  because in some case like Node0 doesn't have RAM installed
 197          *  low ram will be on Node1
 198          */
 199         pages = free_low_memory_core_early();
 200         totalram_pages += pages;
 201
 202         return pages;
 203 }
 204
 205 /**
 206  * free_bootmem_node - mark a page range as usable
 207  * @pgdat: node the range resides on
 208  * @physaddr: starting address of the range
 209  * @size: size of the range in bytes
 210  *
 211  * Partial pages will be considered reserved and left as they are.
 212  *
 213  * The range must reside completely on the specified node.
 214  */
 215 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 216                               unsigned long size)
 217 {
 218         memblock_free(physaddr, size);
 219 }
 220
 221 /**
 222  * free_bootmem - mark a page range as usable
 223  * @addr: starting address of the range
 224  * @size: size of the range in bytes
 225  *
 226  * Partial pages will be considered reserved and left as they are.
 227  *
 228  * The range must be contiguous but may span node boundaries.
 229  */
 230 void __init free_bootmem(unsigned long addr, unsigned long size)
 231 {
 232         memblock_free(addr, size);
 233 }
 234
 235 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 236                                         unsigned long align,
 237                                         unsigned long goal,
 238                                         unsigned long limit)
 239 {
 240         void *ptr;
 241
 242         if (WARN_ON_ONCE(slab_is_available()))
 243                 return kzalloc(size, GFP_NOWAIT);
 244
 245 restart:
 246
 247         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
 248
 249         if (ptr)
 250                 return ptr;
 251
 252         if (goal != 0) {
 253                 goal = 0;
 254                 goto restart;
 255         }
 256
 257         return NULL;
 258 }
 259
 260 /**
 261  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 262  * @size: size of the request in bytes
 263  * @align: alignment of the region
 264  * @goal: preferred starting address of the region
 265  *
 266  * The goal is dropped if it can not be satisfied and the allocation will
 267  * fall back to memory below @goal.
 268  *
 269  * Allocation may happen on any node in the system.
 270  *
 271  * Returns NULL on failure.
 272  */
 273 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 274                                         unsigned long goal)
 275 {
 276         unsigned long limit = -1UL;
 277
 278         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 279 }
 280
 281 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 282                                         unsigned long goal, unsigned long limit)
 283 {
 284         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 285
 286         if (mem)
 287                 return mem;
 288         /*
 289          * Whoops, we cannot satisfy the allocation request.
 290          */
 291         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 292         panic("Out of memory");
 293         return NULL;
 294 }
 295
 296 /**
 297  * __alloc_bootmem - allocate boot memory
 298  * @size: size of the request in bytes
 299  * @align: alignment of the region
 300  * @goal: preferred starting address of the region
 301  *
 302  * The goal is dropped if it can not be satisfied and the allocation will
 303  * fall back to memory below @goal.
 304  *
 305  * Allocation may happen on any node in the system.
 306  *
 307  * The function panics if the request can not be satisfied.
 308  */
 309 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 310                               unsigned long goal)
 311 {
 312         unsigned long limit = -1UL;
 313
 314         return ___alloc_bootmem(size, align, goal, limit);
 315 }
 316
 317 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 318                                                    unsigned long size,
 319                                                    unsigned long align,
 320                                                    unsigned long goal,
 321                                                    unsigned long limit)
 322 {
 323         void *ptr;
 324
 325 again:
 326         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 327                                         goal, limit);
 328         if (ptr)
 329                 return ptr;
 330
 331         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
 332                                         goal, limit);
 333         if (ptr)
 334                 return ptr;
 335
 336         if (goal) {
 337                 goal = 0;
 338                 goto again;
 339         }
 340
 341         return NULL;
 342 }
 343
 344 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 345                                    unsigned long align, unsigned long goal)
 346 {
 347         if (WARN_ON_ONCE(slab_is_available()))
 348                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 349
 350         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 351 }
 352
 353 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 354                                     unsigned long align, unsigned long goal,
 355                                     unsigned long limit)
 356 {
 357         void *ptr;
 358
 359         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
 360         if (ptr)
 361                 return ptr;
 362
 363         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 364         panic("Out of memory");
 365         return NULL;
 366 }
 367
 368 /**
 369  * __alloc_bootmem_node - allocate boot memory from a specific node
 370  * @pgdat: node to allocate from
 371  * @size: size of the request in bytes
 372  * @align: alignment of the region
 373  * @goal: preferred starting address of the region
 374  *
 375  * The goal is dropped if it can not be satisfied and the allocation will
 376  * fall back to memory below @goal.
 377  *
 378  * Allocation may fall back to any node in the system if the specified node
 379  * can not hold the requested memory.
 380  *
 381  * The function panics if the request can not be satisfied.
 382  */
 383 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 384                                    unsigned long align, unsigned long goal)
 385 {
 386         if (WARN_ON_ONCE(slab_is_available()))
 387                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 388
 389         return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 390 }
 391
 392 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 393                                    unsigned long align, unsigned long goal)
 394 {
 395         return __alloc_bootmem_node(pgdat, size, align, goal);
 396 }
 397
 398 #ifndef ARCH_LOW_ADDRESS_LIMIT
 399 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 400 #endif
 401
 402 /**
 403  * __alloc_bootmem_low - allocate low boot memory
 404  * @size: size of the request in bytes
 405  * @align: alignment of the region
 406  * @goal: preferred starting address of the region
 407  *
 408  * The goal is dropped if it can not be satisfied and the allocation will
 409  * fall back to memory below @goal.
 410  *
 411  * Allocation may happen on any node in the system.
 412  *
 413  * The function panics if the request can not be satisfied.
 414  */
 415 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 416                                   unsigned long goal)
 417 {
 418         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 419 }
 420
 421 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
 422                                           unsigned long align,
 423                                           unsigned long goal)
 424 {
 425         return ___alloc_bootmem_nopanic(size, align, goal,
 426                                         ARCH_LOW_ADDRESS_LIMIT);
 427 }
 428
 429 /**
 430  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 431  * @pgdat: node to allocate from
 432  * @size: size of the request in bytes
 433  * @align: alignment of the region
 434  * @goal: preferred starting address of the region
 435  *
 436  * The goal is dropped if it can not be satisfied and the allocation will
 437  * fall back to memory below @goal.
 438  *
 439  * Allocation may fall back to any node in the system if the specified node
 440  * can not hold the requested memory.
 441  *
 442  * The function panics if the request can not be satisfied.
 443  */
 444 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 445                                        unsigned long align, unsigned long goal)
 446 {
 447         if (WARN_ON_ONCE(slab_is_available()))
 448                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 449
 450         return ___alloc_bootmem_node(pgdat, size, align, goal,
 451                                      ARCH_LOW_ADDRESS_LIMIT);
 452 }