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         ptr = phys_to_virt(addr);
  49         memset(ptr, 0, size);
  50         memblock_reserve(addr, 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 unsigned long __init free_low_memory_core_early(int nodeid)
 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 /**
 141  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 142  * @pgdat: node to be released
 143  *
 144  * Returns the number of pages actually released.
 145  */
 146 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 147 {
 148         register_page_bootmem_info_node(pgdat);
 149
 150         /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
 151         return 0;
 152 }
 153
 154 /**
 155  * free_all_bootmem - release free pages to the buddy allocator
 156  *
 157  * Returns the number of pages actually released.
 158  */
 159 unsigned long __init free_all_bootmem(void)
 160 {
 161         /*
 162          * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
 163          *  because in some case like Node0 doesn't have RAM installed
 164          *  low ram will be on Node1
 165          */
 166         return free_low_memory_core_early(MAX_NUMNODES);
 167 }
 168
 169 /**
 170  * free_bootmem_node - mark a page range as usable
 171  * @pgdat: node the range resides on
 172  * @physaddr: starting address of the range
 173  * @size: size of the range in bytes
 174  *
 175  * Partial pages will be considered reserved and left as they are.
 176  *
 177  * The range must reside completely on the specified node.
 178  */
 179 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 180                               unsigned long size)
 181 {
 182         kmemleak_free_part(__va(physaddr), size);
 183         memblock_free(physaddr, size);
 184 }
 185
 186 /**
 187  * free_bootmem - mark a page range as usable
 188  * @addr: starting address of the range
 189  * @size: size of the range in bytes
 190  *
 191  * Partial pages will be considered reserved and left as they are.
 192  *
 193  * The range must be contiguous but may span node boundaries.
 194  */
 195 void __init free_bootmem(unsigned long addr, unsigned long size)
 196 {
 197         kmemleak_free_part(__va(addr), size);
 198         memblock_free(addr, size);
 199 }
 200
 201 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 202                                         unsigned long align,
 203                                         unsigned long goal,
 204                                         unsigned long limit)
 205 {
 206         void *ptr;
 207
 208         if (WARN_ON_ONCE(slab_is_available()))
 209                 return kzalloc(size, GFP_NOWAIT);
 210
 211 restart:
 212
 213         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
 214
 215         if (ptr)
 216                 return ptr;
 217
 218         if (goal != 0) {
 219                 goal = 0;
 220                 goto restart;
 221         }
 222
 223         return NULL;
 224 }
 225
 226 /**
 227  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 228  * @size: size of the request in bytes
 229  * @align: alignment of the region
 230  * @goal: preferred starting address of the region
 231  *
 232  * The goal is dropped if it can not be satisfied and the allocation will
 233  * fall back to memory below @goal.
 234  *
 235  * Allocation may happen on any node in the system.
 236  *
 237  * Returns NULL on failure.
 238  */
 239 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 240                                         unsigned long goal)
 241 {
 242         unsigned long limit = -1UL;
 243
 244         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 245 }
 246
 247 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 248                                         unsigned long goal, unsigned long limit)
 249 {
 250         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 251
 252         if (mem)
 253                 return mem;
 254         /*
 255          * Whoops, we cannot satisfy the allocation request.
 256          */
 257         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 258         panic("Out of memory");
 259         return NULL;
 260 }
 261
 262 /**
 263  * __alloc_bootmem - allocate boot memory
 264  * @size: size of the request in bytes
 265  * @align: alignment of the region
 266  * @goal: preferred starting address of the region
 267  *
 268  * The goal is dropped if it can not be satisfied and the allocation will
 269  * fall back to memory below @goal.
 270  *
 271  * Allocation may happen on any node in the system.
 272  *
 273  * The function panics if the request can not be satisfied.
 274  */
 275 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 276                               unsigned long goal)
 277 {
 278         unsigned long limit = -1UL;
 279
 280         return ___alloc_bootmem(size, align, goal, limit);
 281 }
 282
 283 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 284                                                    unsigned long size,
 285                                                    unsigned long align,
 286                                                    unsigned long goal,
 287                                                    unsigned long limit)
 288 {
 289         void *ptr;
 290
 291 again:
 292         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 293                                         goal, limit);
 294         if (ptr)
 295                 return ptr;
 296
 297         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
 298                                         goal, limit);
 299         if (ptr)
 300                 return ptr;
 301
 302         if (goal) {
 303                 goal = 0;
 304                 goto again;
 305         }
 306
 307         return NULL;
 308 }
 309
 310 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 311                                    unsigned long align, unsigned long goal)
 312 {
 313         if (WARN_ON_ONCE(slab_is_available()))
 314                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 315
 316         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 317 }
 318
 319 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 320                                     unsigned long align, unsigned long goal,
 321                                     unsigned long limit)
 322 {
 323         void *ptr;
 324
 325         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
 326         if (ptr)
 327                 return ptr;
 328
 329         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 330         panic("Out of memory");
 331         return NULL;
 332 }
 333
 334 /**
 335  * __alloc_bootmem_node - allocate boot memory from a specific node
 336  * @pgdat: node to allocate from
 337  * @size: size of the request in bytes
 338  * @align: alignment of the region
 339  * @goal: preferred starting address of the region
 340  *
 341  * The goal is dropped if it can not be satisfied and the allocation will
 342  * fall back to memory below @goal.
 343  *
 344  * Allocation may fall back to any node in the system if the specified node
 345  * can not hold the requested memory.
 346  *
 347  * The function panics if the request can not be satisfied.
 348  */
 349 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 350                                    unsigned long align, unsigned long goal)
 351 {
 352         if (WARN_ON_ONCE(slab_is_available()))
 353                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 354
 355         return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 356 }
 357
 358 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 359                                    unsigned long align, unsigned long goal)
 360 {
 361         return __alloc_bootmem_node(pgdat, size, align, goal);
 362 }
 363
 364 #ifndef ARCH_LOW_ADDRESS_LIMIT
 365 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 366 #endif
 367
 368 /**
 369  * __alloc_bootmem_low - allocate low boot memory
 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 happen on any node in the system.
 378  *
 379  * The function panics if the request can not be satisfied.
 380  */
 381 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 382                                   unsigned long goal)
 383 {
 384         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 385 }
 386
 387 /**
 388  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 389  * @pgdat: node to allocate from
 390  * @size: size of the request in bytes
 391  * @align: alignment of the region
 392  * @goal: preferred starting address of the region
 393  *
 394  * The goal is dropped if it can not be satisfied and the allocation will
 395  * fall back to memory below @goal.
 396  *
 397  * Allocation may fall back to any node in the system if the specified node
 398  * can not hold the requested memory.
 399  *
 400  * The function panics if the request can not be satisfied.
 401  */
 402 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 403                                        unsigned long align, unsigned long goal)
 404 {
 405         if (WARN_ON_ONCE(slab_is_available()))
 406                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 407
 408         return ___alloc_bootmem_node(pgdat, size, align, goal,
 409                                      ARCH_LOW_ADDRESS_LIMIT);
 410 }