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
  41         if (limit > memblock.current_limit)
  42                 limit = memblock.current_limit;
  43
  44         addr = memblock_find_in_range_node(goal, limit, size, align, nid);
  45         if (!addr)
  46                 return NULL;
  47
  48         memblock_reserve(addr, size);
  49         ptr = phys_to_virt(addr);
  50         memset(ptr, 0, size);
  51         /*
  52          * The min_count is set to 0 so that bootmem allocated blocks
  53          * are never reported as leaks.
  54          */
  55         kmemleak_alloc(ptr, size, 0, 0);
  56         return ptr;
  57 }
  58
  59 /*
  60  * free_bootmem_late - free bootmem pages directly to page allocator
  61  * @addr: starting address of the range
  62  * @size: size of the range in bytes
  63  *
  64  * This is only useful when the bootmem allocator has already been torn
  65  * down, but we are still initializing the system.  Pages are given directly
  66  * to the page allocator, no bootmem metadata is updated because it is gone.
  67  */
  68 void __init free_bootmem_late(unsigned long addr, unsigned long size)
  69 {
  70         unsigned long cursor, end;
  71
  72         kmemleak_free_part(__va(addr), size);
  73
  74         cursor = PFN_UP(addr);
  75         end = PFN_DOWN(addr + size);
  76
  77         for (; cursor < end; cursor++) {
  78                 __free_pages_bootmem(pfn_to_page(cursor), 0);
  79                 totalram_pages++;
  80         }
  81 }
  82
  83 static void __init __free_pages_memory(unsigned long start, unsigned long end)
  84 {
  85         unsigned long i, start_aligned, end_aligned;
  86         int order = ilog2(BITS_PER_LONG);
  87
  88         start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
  89         end_aligned = end & ~(BITS_PER_LONG - 1);
  90
  91         if (end_aligned <= start_aligned) {
  92                 for (i = start; i < end; i++)
  93                         __free_pages_bootmem(pfn_to_page(i), 0);
  94
  95                 return;
  96         }
  97
  98         for (i = start; i < start_aligned; i++)
  99                 __free_pages_bootmem(pfn_to_page(i), 0);
 100
 101         for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
 102                 __free_pages_bootmem(pfn_to_page(i), order);
 103
 104         for (i = end_aligned; i < end; i++)
 105                 __free_pages_bootmem(pfn_to_page(i), 0);
 106 }
 107
 108 static unsigned long __init __free_memory_core(phys_addr_t start,
 109                                  phys_addr_t end)
 110 {
 111         unsigned long start_pfn = PFN_UP(start);
 112         unsigned long end_pfn = min_t(unsigned long,
 113                                       PFN_DOWN(end), max_low_pfn);
 114
 115         if (start_pfn > end_pfn)
 116                 return 0;
 117
 118         __free_pages_memory(start_pfn, end_pfn);
 119
 120         return end_pfn - start_pfn;
 121 }
 122
 123 static unsigned long __init free_low_memory_core_early(void)
 124 {
 125         unsigned long count = 0;
 126         phys_addr_t start, end, size;
 127         u64 i;
 128
 129         for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
 130                 count += __free_memory_core(start, end);
 131
 132         /* free range that is used for reserved array if we allocate it */
 133         size = get_allocated_memblock_reserved_regions_info(&start);
 134         if (size)
 135                 count += __free_memory_core(start, start + size);
 136
 137         return count;
 138 }
 139
 140 static int reset_managed_pages_done __initdata;
 141
 142 static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
 143 {
 144         struct zone *z;
 145
 146         if (reset_managed_pages_done)
 147                 return;
 148         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 149                 z->managed_pages = 0;
 150 }
 151
 152 void __init reset_all_zones_managed_pages(void)
 153 {
 154         struct pglist_data *pgdat;
 155
 156         for_each_online_pgdat(pgdat)
 157                 reset_node_managed_pages(pgdat);
 158         reset_managed_pages_done = 1;
 159 }
 160
 161 /**
 162  * free_all_bootmem - release free pages to the buddy allocator
 163  *
 164  * Returns the number of pages actually released.
 165  */
 166 unsigned long __init free_all_bootmem(void)
 167 {
 168         unsigned long pages;
 169
 170         reset_all_zones_managed_pages();
 171
 172         /*
 173          * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
 174          *  because in some case like Node0 doesn't have RAM installed
 175          *  low ram will be on Node1
 176          */
 177         pages = free_low_memory_core_early();
 178         totalram_pages += pages;
 179
 180         return pages;
 181 }
 182
 183 /**
 184  * free_bootmem_node - mark a page range as usable
 185  * @pgdat: node the range resides on
 186  * @physaddr: starting address of the range
 187  * @size: size of the range in bytes
 188  *
 189  * Partial pages will be considered reserved and left as they are.
 190  *
 191  * The range must reside completely on the specified node.
 192  */
 193 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 194                               unsigned long size)
 195 {
 196         kmemleak_free_part(__va(physaddr), size);
 197         memblock_free(physaddr, size);
 198 }
 199
 200 /**
 201  * free_bootmem - mark a page range as usable
 202  * @addr: starting address of the range
 203  * @size: size of the range in bytes
 204  *
 205  * Partial pages will be considered reserved and left as they are.
 206  *
 207  * The range must be contiguous but may span node boundaries.
 208  */
 209 void __init free_bootmem(unsigned long addr, unsigned long size)
 210 {
 211         kmemleak_free_part(__va(addr), size);
 212         memblock_free(addr, size);
 213 }
 214
 215 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 216                                         unsigned long align,
 217                                         unsigned long goal,
 218                                         unsigned long limit)
 219 {
 220         void *ptr;
 221
 222         if (WARN_ON_ONCE(slab_is_available()))
 223                 return kzalloc(size, GFP_NOWAIT);
 224
 225 restart:
 226
 227         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
 228
 229         if (ptr)
 230                 return ptr;
 231
 232         if (goal != 0) {
 233                 goal = 0;
 234                 goto restart;
 235         }
 236
 237         return NULL;
 238 }
 239
 240 /**
 241  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 242  * @size: size of the request in bytes
 243  * @align: alignment of the region
 244  * @goal: preferred starting address of the region
 245  *
 246  * The goal is dropped if it can not be satisfied and the allocation will
 247  * fall back to memory below @goal.
 248  *
 249  * Allocation may happen on any node in the system.
 250  *
 251  * Returns NULL on failure.
 252  */
 253 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 254                                         unsigned long goal)
 255 {
 256         unsigned long limit = -1UL;
 257
 258         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 259 }
 260
 261 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 262                                         unsigned long goal, unsigned long limit)
 263 {
 264         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 265
 266         if (mem)
 267                 return mem;
 268         /*
 269          * Whoops, we cannot satisfy the allocation request.
 270          */
 271         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 272         panic("Out of memory");
 273         return NULL;
 274 }
 275
 276 /**
 277  * __alloc_bootmem - allocate boot memory
 278  * @size: size of the request in bytes
 279  * @align: alignment of the region
 280  * @goal: preferred starting address of the region
 281  *
 282  * The goal is dropped if it can not be satisfied and the allocation will
 283  * fall back to memory below @goal.
 284  *
 285  * Allocation may happen on any node in the system.
 286  *
 287  * The function panics if the request can not be satisfied.
 288  */
 289 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 290                               unsigned long goal)
 291 {
 292         unsigned long limit = -1UL;
 293
 294         return ___alloc_bootmem(size, align, goal, limit);
 295 }
 296
 297 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 298                                                    unsigned long size,
 299                                                    unsigned long align,
 300                                                    unsigned long goal,
 301                                                    unsigned long limit)
 302 {
 303         void *ptr;
 304
 305 again:
 306         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 307                                         goal, limit);
 308         if (ptr)
 309                 return ptr;
 310
 311         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
 312                                         goal, limit);
 313         if (ptr)
 314                 return ptr;
 315
 316         if (goal) {
 317                 goal = 0;
 318                 goto again;
 319         }
 320
 321         return NULL;
 322 }
 323
 324 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 325                                    unsigned long align, unsigned long goal)
 326 {
 327         if (WARN_ON_ONCE(slab_is_available()))
 328                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 329
 330         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 331 }
 332
 333 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 334                                     unsigned long align, unsigned long goal,
 335                                     unsigned long limit)
 336 {
 337         void *ptr;
 338
 339         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
 340         if (ptr)
 341                 return ptr;
 342
 343         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 344         panic("Out of memory");
 345         return NULL;
 346 }
 347
 348 /**
 349  * __alloc_bootmem_node - allocate boot memory from a specific node
 350  * @pgdat: node to allocate from
 351  * @size: size of the request in bytes
 352  * @align: alignment of the region
 353  * @goal: preferred starting address of the region
 354  *
 355  * The goal is dropped if it can not be satisfied and the allocation will
 356  * fall back to memory below @goal.
 357  *
 358  * Allocation may fall back to any node in the system if the specified node
 359  * can not hold the requested memory.
 360  *
 361  * The function panics if the request can not be satisfied.
 362  */
 363 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 364                                    unsigned long align, unsigned long goal)
 365 {
 366         if (WARN_ON_ONCE(slab_is_available()))
 367                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 368
 369         return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 370 }
 371
 372 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 373                                    unsigned long align, unsigned long goal)
 374 {
 375         return __alloc_bootmem_node(pgdat, size, align, goal);
 376 }
 377
 378 #ifndef ARCH_LOW_ADDRESS_LIMIT
 379 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 380 #endif
 381
 382 /**
 383  * __alloc_bootmem_low - allocate low boot memory
 384  * @size: size of the request in bytes
 385  * @align: alignment of the region
 386  * @goal: preferred starting address of the region
 387  *
 388  * The goal is dropped if it can not be satisfied and the allocation will
 389  * fall back to memory below @goal.
 390  *
 391  * Allocation may happen on any node in the system.
 392  *
 393  * The function panics if the request can not be satisfied.
 394  */
 395 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 396                                   unsigned long goal)
 397 {
 398         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 399 }
 400
 401 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
 402                                           unsigned long align,
 403                                           unsigned long goal)
 404 {
 405         return ___alloc_bootmem_nopanic(size, align, goal,
 406                                         ARCH_LOW_ADDRESS_LIMIT);
 407 }
 408
 409 /**
 410  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 411  * @pgdat: node to allocate from
 412  * @size: size of the request in bytes
 413  * @align: alignment of the region
 414  * @goal: preferred starting address of the region
 415  *
 416  * The goal is dropped if it can not be satisfied and the allocation will
 417  * fall back to memory below @goal.
 418  *
 419  * Allocation may fall back to any node in the system if the specified node
 420  * can not hold the requested memory.
 421  *
 422  * The function panics if the request can not be satisfied.
 423  */
 424 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 425                                        unsigned long align, unsigned long goal)
 426 {
 427         if (WARN_ON_ONCE(slab_is_available()))
 428                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 429
 430         return ___alloc_bootmem_node(pgdat, size, align, goal,
 431                                      ARCH_LOW_ADDRESS_LIMIT);
 432 }