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 again:
 301         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 302                                          goal, -1ULL);
 303         if (ptr)
 304                 return ptr;
 305
 306         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
 307                                         goal, -1ULL);
 308         if (!ptr && goal) {
 309                 goal = 0;
 310                 goto again;
 311         }
 312         return ptr;
 313 }
 314
 315 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 316                                    unsigned long align, unsigned long goal)
 317 {
 318         return __alloc_bootmem_node(pgdat, size, align, goal);
 319 }
 320
 321 #ifdef CONFIG_SPARSEMEM
 322 /**
 323  * alloc_bootmem_section - allocate boot memory from a specific section
 324  * @size: size of the request in bytes
 325  * @section_nr: sparse map section to allocate from
 326  *
 327  * Return NULL on failure.
 328  */
 329 void * __init alloc_bootmem_section(unsigned long size,
 330                                     unsigned long section_nr)
 331 {
 332         unsigned long pfn, goal, limit;
 333
 334         pfn = section_nr_to_pfn(section_nr);
 335         goal = pfn << PAGE_SHIFT;
 336         limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
 337
 338         return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
 339                                          SMP_CACHE_BYTES, goal, limit);
 340 }
 341 #endif
 342
 343 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 344                                    unsigned long align, unsigned long goal)
 345 {
 346         void *ptr;
 347
 348         if (WARN_ON_ONCE(slab_is_available()))
 349                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 350
 351         ptr =  __alloc_memory_core_early(pgdat->node_id, size, align,
 352                                                  goal, -1ULL);
 353         if (ptr)
 354                 return ptr;
 355
 356         return __alloc_bootmem_nopanic(size, align, goal);
 357 }
 358
 359 #ifndef ARCH_LOW_ADDRESS_LIMIT
 360 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 361 #endif
 362
 363 /**
 364  * __alloc_bootmem_low - allocate low boot memory
 365  * @size: size of the request in bytes
 366  * @align: alignment of the region
 367  * @goal: preferred starting address of the region
 368  *
 369  * The goal is dropped if it can not be satisfied and the allocation will
 370  * fall back to memory below @goal.
 371  *
 372  * Allocation may happen on any node in the system.
 373  *
 374  * The function panics if the request can not be satisfied.
 375  */
 376 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 377                                   unsigned long goal)
 378 {
 379         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 380 }
 381
 382 /**
 383  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 384  * @pgdat: node to allocate from
 385  * @size: size of the request in bytes
 386  * @align: alignment of the region
 387  * @goal: preferred starting address of the region
 388  *
 389  * The goal is dropped if it can not be satisfied and the allocation will
 390  * fall back to memory below @goal.
 391  *
 392  * Allocation may fall back to any node in the system if the specified node
 393  * can not hold the requested memory.
 394  *
 395  * The function panics if the request can not be satisfied.
 396  */
 397 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 398                                        unsigned long align, unsigned long goal)
 399 {
 400         void *ptr;
 401
 402         if (WARN_ON_ONCE(slab_is_available()))
 403                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 404
 405         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 406                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 407         if (ptr)
 408                 return ptr;
 409
 410         return  __alloc_memory_core_early(MAX_NUMNODES, size, align,
 411                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 412 }