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