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 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
 150         {
 151                 phys_addr_t size;
 152
 153                 /* Free memblock.reserved array if it was allocated */
 154                 size = get_allocated_memblock_reserved_regions_info(&start);
 155                 if (size)
 156                         count += __free_memory_core(start, start + size);
 157
 158                 /* Free memblock.memory array if it was allocated */
 159                 size = get_allocated_memblock_memory_regions_info(&start);
 160                 if (size)
 161                         count += __free_memory_core(start, start + size);
 162         }
 163 #endif
 164
 165         return count;
 166 }
 167
 168 static int reset_managed_pages_done __initdata;
 169
 170 void reset_node_managed_pages(pg_data_t *pgdat)
 171 {
 172         struct zone *z;
 173
 174         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 175                 z->managed_pages = 0;
 176 }
 177
 178 void __init reset_all_zones_managed_pages(void)
 179 {
 180         struct pglist_data *pgdat;
 181
 182         if (reset_managed_pages_done)
 183                 return;
 184
 185         for_each_online_pgdat(pgdat)
 186                 reset_node_managed_pages(pgdat);
 187
 188         reset_managed_pages_done = 1;
 189 }
 190
 191 /**
 192  * free_all_bootmem - release free pages to the buddy allocator
 193  *
 194  * Returns the number of pages actually released.
 195  */
 196 unsigned long __init free_all_bootmem(void)
 197 {
 198         unsigned long pages;
 199
 200         reset_all_zones_managed_pages();
 201
 202         pages = free_low_memory_core_early();
 203         totalram_pages += pages;
 204
 205         return pages;
 206 }
 207
 208 /**
 209  * free_bootmem_node - mark a page range as usable
 210  * @pgdat: node the range resides on
 211  * @physaddr: starting address of the range
 212  * @size: size of the range in bytes
 213  *
 214  * Partial pages will be considered reserved and left as they are.
 215  *
 216  * The range must reside completely on the specified node.
 217  */
 218 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 219                               unsigned long size)
 220 {
 221         memblock_free(physaddr, size);
 222 }
 223
 224 /**
 225  * free_bootmem - mark a page range as usable
 226  * @addr: starting address of the range
 227  * @size: size of the range in bytes
 228  *
 229  * Partial pages will be considered reserved and left as they are.
 230  *
 231  * The range must be contiguous but may span node boundaries.
 232  */
 233 void __init free_bootmem(unsigned long addr, unsigned long size)
 234 {
 235         memblock_free(addr, size);
 236 }
 237
 238 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 239                                         unsigned long align,
 240                                         unsigned long goal,
 241                                         unsigned long limit)
 242 {
 243         void *ptr;
 244
 245         if (WARN_ON_ONCE(slab_is_available()))
 246                 return kzalloc(size, GFP_NOWAIT);
 247
 248 restart:
 249
 250         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
 251
 252         if (ptr)
 253                 return ptr;
 254
 255         if (goal != 0) {
 256                 goal = 0;
 257                 goto restart;
 258         }
 259
 260         return NULL;
 261 }
 262
 263 /**
 264  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 265  * @size: size of the request in bytes
 266  * @align: alignment of the region
 267  * @goal: preferred starting address of the region
 268  *
 269  * The goal is dropped if it can not be satisfied and the allocation will
 270  * fall back to memory below @goal.
 271  *
 272  * Allocation may happen on any node in the system.
 273  *
 274  * Returns NULL on failure.
 275  */
 276 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 277                                         unsigned long goal)
 278 {
 279         unsigned long limit = -1UL;
 280
 281         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 282 }
 283
 284 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 285                                         unsigned long goal, unsigned long limit)
 286 {
 287         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 288
 289         if (mem)
 290                 return mem;
 291         /*
 292          * Whoops, we cannot satisfy the allocation request.
 293          */
 294         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 295         panic("Out of memory");
 296         return NULL;
 297 }
 298
 299 /**
 300  * __alloc_bootmem - allocate boot memory
 301  * @size: size of the request in bytes
 302  * @align: alignment of the region
 303  * @goal: preferred starting address of the region
 304  *
 305  * The goal is dropped if it can not be satisfied and the allocation will
 306  * fall back to memory below @goal.
 307  *
 308  * Allocation may happen on any node in the system.
 309  *
 310  * The function panics if the request can not be satisfied.
 311  */
 312 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 313                               unsigned long goal)
 314 {
 315         unsigned long limit = -1UL;
 316
 317         return ___alloc_bootmem(size, align, goal, limit);
 318 }
 319
 320 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 321                                                    unsigned long size,
 322                                                    unsigned long align,
 323                                                    unsigned long goal,
 324                                                    unsigned long limit)
 325 {
 326         void *ptr;
 327
 328 again:
 329         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 330                                         goal, limit);
 331         if (ptr)
 332                 return ptr;
 333
 334         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
 335                                         goal, limit);
 336         if (ptr)
 337                 return ptr;
 338
 339         if (goal) {
 340                 goal = 0;
 341                 goto again;
 342         }
 343
 344         return NULL;
 345 }
 346
 347 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 348                                    unsigned long align, unsigned long goal)
 349 {
 350         if (WARN_ON_ONCE(slab_is_available()))
 351                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 352
 353         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 354 }
 355
 356 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 357                                     unsigned long align, unsigned long goal,
 358                                     unsigned long limit)
 359 {
 360         void *ptr;
 361
 362         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
 363         if (ptr)
 364                 return ptr;
 365
 366         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 367         panic("Out of memory");
 368         return NULL;
 369 }
 370
 371 /**
 372  * __alloc_bootmem_node - allocate boot memory from a specific node
 373  * @pgdat: node to allocate from
 374  * @size: size of the request in bytes
 375  * @align: alignment of the region
 376  * @goal: preferred starting address of the region
 377  *
 378  * The goal is dropped if it can not be satisfied and the allocation will
 379  * fall back to memory below @goal.
 380  *
 381  * Allocation may fall back to any node in the system if the specified node
 382  * can not hold the requested memory.
 383  *
 384  * The function panics if the request can not be satisfied.
 385  */
 386 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 387                                    unsigned long align, unsigned long goal)
 388 {
 389         if (WARN_ON_ONCE(slab_is_available()))
 390                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 391
 392         return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 393 }
 394
 395 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 396                                    unsigned long align, unsigned long goal)
 397 {
 398         return __alloc_bootmem_node(pgdat, size, align, goal);
 399 }
 400
 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 }