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 unsigned long __init free_low_memory_core_early(int nodeid)
 109 {
 110         unsigned long count = 0;
 111         phys_addr_t start, end;
 112         u64 i;
 113
 114         /* free reserved array temporarily so that it's treated as free area */
 115         memblock_free_reserved_regions();
 116
 117         for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
 118                 unsigned long start_pfn = PFN_UP(start);
 119                 unsigned long end_pfn = min_t(unsigned long,
 120                                               PFN_DOWN(end), max_low_pfn);
 121                 if (start_pfn < end_pfn) {
 122                         __free_pages_memory(start_pfn, end_pfn);
 123                         count += end_pfn - start_pfn;
 124                 }
 125         }
 126
 127         /* put region array back? */
 128         memblock_reserve_reserved_regions();
 129         return count;
 130 }
 131
 132 /**
 133  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 134  * @pgdat: node to be released
 135  *
 136  * Returns the number of pages actually released.
 137  */
 138 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 139 {
 140         register_page_bootmem_info_node(pgdat);
 141
 142         /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
 143         return 0;
 144 }
 145
 146 /**
 147  * free_all_bootmem - release free pages to the buddy allocator
 148  *
 149  * Returns the number of pages actually released.
 150  */
 151 unsigned long __init free_all_bootmem(void)
 152 {
 153         /*
 154          * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
 155          *  because in some case like Node0 doesn't have RAM installed
 156          *  low ram will be on Node1
 157          * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
 158          *  will be used instead of only Node0 related
 159          */
 160         return free_low_memory_core_early(MAX_NUMNODES);
 161 }
 162
 163 /**
 164  * free_bootmem_node - mark a page range as usable
 165  * @pgdat: node the range resides on
 166  * @physaddr: starting address of the range
 167  * @size: size of the range in bytes
 168  *
 169  * Partial pages will be considered reserved and left as they are.
 170  *
 171  * The range must reside completely on the specified node.
 172  */
 173 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 174                               unsigned long size)
 175 {
 176         kmemleak_free_part(__va(physaddr), size);
 177         memblock_free(physaddr, size);
 178 }
 179
 180 /**
 181  * free_bootmem - mark a page range as usable
 182  * @addr: starting address of the range
 183  * @size: size of the range in bytes
 184  *
 185  * Partial pages will be considered reserved and left as they are.
 186  *
 187  * The range must be contiguous but may span node boundaries.
 188  */
 189 void __init free_bootmem(unsigned long addr, unsigned long size)
 190 {
 191         kmemleak_free_part(__va(addr), size);
 192         memblock_free(addr, size);
 193 }
 194
 195 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 196                                         unsigned long align,
 197                                         unsigned long goal,
 198                                         unsigned long limit)
 199 {
 200         void *ptr;
 201
 202         if (WARN_ON_ONCE(slab_is_available()))
 203                 return kzalloc(size, GFP_NOWAIT);
 204
 205 restart:
 206
 207         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
 208
 209         if (ptr)
 210                 return ptr;
 211
 212         if (goal != 0) {
 213                 goal = 0;
 214                 goto restart;
 215         }
 216
 217         return NULL;
 218 }
 219
 220 /**
 221  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 222  * @size: size of the request in bytes
 223  * @align: alignment of the region
 224  * @goal: preferred starting address of the region
 225  *
 226  * The goal is dropped if it can not be satisfied and the allocation will
 227  * fall back to memory below @goal.
 228  *
 229  * Allocation may happen on any node in the system.
 230  *
 231  * Returns NULL on failure.
 232  */
 233 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 234                                         unsigned long goal)
 235 {
 236         unsigned long limit = -1UL;
 237
 238         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 239 }
 240
 241 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 242                                         unsigned long goal, unsigned long limit)
 243 {
 244         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 245
 246         if (mem)
 247                 return mem;
 248         /*
 249          * Whoops, we cannot satisfy the allocation request.
 250          */
 251         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 252         panic("Out of memory");
 253         return NULL;
 254 }
 255
 256 /**
 257  * __alloc_bootmem - allocate boot memory
 258  * @size: size of the request in bytes
 259  * @align: alignment of the region
 260  * @goal: preferred starting address of the region
 261  *
 262  * The goal is dropped if it can not be satisfied and the allocation will
 263  * fall back to memory below @goal.
 264  *
 265  * Allocation may happen on any node in the system.
 266  *
 267  * The function panics if the request can not be satisfied.
 268  */
 269 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 270                               unsigned long goal)
 271 {
 272         unsigned long limit = -1UL;
 273
 274         return ___alloc_bootmem(size, align, goal, limit);
 275 }
 276
 277 /**
 278  * __alloc_bootmem_node - allocate boot memory from a specific node
 279  * @pgdat: node to allocate from
 280  * @size: size of the request in bytes
 281  * @align: alignment of the region
 282  * @goal: preferred starting address of the region
 283  *
 284  * The goal is dropped if it can not be satisfied and the allocation will
 285  * fall back to memory below @goal.
 286  *
 287  * Allocation may fall back to any node in the system if the specified node
 288  * can not hold the requested memory.
 289  *
 290  * The function panics if the request can not be satisfied.
 291  */
 292 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 293                                    unsigned long align, unsigned long goal)
 294 {
 295         void *ptr;
 296
 297         if (WARN_ON_ONCE(slab_is_available()))
 298                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 299
 300         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 301                                          goal, -1ULL);
 302         if (ptr)
 303                 return ptr;
 304
 305         return __alloc_memory_core_early(MAX_NUMNODES, size, align,
 306                                          goal, -1ULL);
 307 }
 308
 309 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 310                                    unsigned long align, unsigned long goal)
 311 {
 312         return __alloc_bootmem_node(pgdat, size, align, goal);
 313 }
 314
 315 #ifdef CONFIG_SPARSEMEM
 316 /**
 317  * alloc_bootmem_section - allocate boot memory from a specific section
 318  * @size: size of the request in bytes
 319  * @section_nr: sparse map section to allocate from
 320  *
 321  * Return NULL on failure.
 322  */
 323 void * __init alloc_bootmem_section(unsigned long size,
 324                                     unsigned long section_nr)
 325 {
 326         unsigned long pfn, goal, limit;
 327
 328         pfn = section_nr_to_pfn(section_nr);
 329         goal = pfn << PAGE_SHIFT;
 330         limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
 331
 332         return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
 333                                          SMP_CACHE_BYTES, goal, limit);
 334 }
 335 #endif
 336
 337 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 338                                    unsigned long align, unsigned long goal)
 339 {
 340         void *ptr;
 341
 342         if (WARN_ON_ONCE(slab_is_available()))
 343                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 344
 345         ptr =  __alloc_memory_core_early(pgdat->node_id, size, align,
 346                                                  goal, -1ULL);
 347         if (ptr)
 348                 return ptr;
 349
 350         return __alloc_bootmem_nopanic(size, align, goal);
 351 }
 352
 353 #ifndef ARCH_LOW_ADDRESS_LIMIT
 354 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 355 #endif
 356
 357 /**
 358  * __alloc_bootmem_low - allocate low boot memory
 359  * @size: size of the request in bytes
 360  * @align: alignment of the region
 361  * @goal: preferred starting address of the region
 362  *
 363  * The goal is dropped if it can not be satisfied and the allocation will
 364  * fall back to memory below @goal.
 365  *
 366  * Allocation may happen on any node in the system.
 367  *
 368  * The function panics if the request can not be satisfied.
 369  */
 370 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 371                                   unsigned long goal)
 372 {
 373         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 374 }
 375
 376 /**
 377  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 378  * @pgdat: node to allocate from
 379  * @size: size of the request in bytes
 380  * @align: alignment of the region
 381  * @goal: preferred starting address of the region
 382  *
 383  * The goal is dropped if it can not be satisfied and the allocation will
 384  * fall back to memory below @goal.
 385  *
 386  * Allocation may fall back to any node in the system if the specified node
 387  * can not hold the requested memory.
 388  *
 389  * The function panics if the request can not be satisfied.
 390  */
 391 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 392                                        unsigned long align, unsigned long goal)
 393 {
 394         void *ptr;
 395
 396         if (WARN_ON_ONCE(slab_is_available()))
 397                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 398
 399         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 400                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 401         if (ptr)
 402                 return ptr;
 403
 404         return  __alloc_memory_core_early(MAX_NUMNODES, size, align,
 405                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 406 }