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