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          * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
 166          *  will be used instead of only Node0 related
 167          */
 168         return free_low_memory_core_early(MAX_NUMNODES);
 169 }
 170
 171 /**
 172  * free_bootmem_node - mark a page range as usable
 173  * @pgdat: node the range resides on
 174  * @physaddr: starting address of the range
 175  * @size: size of the range in bytes
 176  *
 177  * Partial pages will be considered reserved and left as they are.
 178  *
 179  * The range must reside completely on the specified node.
 180  */
 181 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 182                               unsigned long size)
 183 {
 184         kmemleak_free_part(__va(physaddr), size);
 185         memblock_free(physaddr, size);
 186 }
 187
 188 /**
 189  * free_bootmem - mark a page range as usable
 190  * @addr: starting address of the range
 191  * @size: size of the range in bytes
 192  *
 193  * Partial pages will be considered reserved and left as they are.
 194  *
 195  * The range must be contiguous but may span node boundaries.
 196  */
 197 void __init free_bootmem(unsigned long addr, unsigned long size)
 198 {
 199         kmemleak_free_part(__va(addr), size);
 200         memblock_free(addr, size);
 201 }
 202
 203 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 204                                         unsigned long align,
 205                                         unsigned long goal,
 206                                         unsigned long limit)
 207 {
 208         void *ptr;
 209
 210         if (WARN_ON_ONCE(slab_is_available()))
 211                 return kzalloc(size, GFP_NOWAIT);
 212
 213 restart:
 214
 215         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
 216
 217         if (ptr)
 218                 return ptr;
 219
 220         if (goal != 0) {
 221                 goal = 0;
 222                 goto restart;
 223         }
 224
 225         return NULL;
 226 }
 227
 228 /**
 229  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 230  * @size: size of the request in bytes
 231  * @align: alignment of the region
 232  * @goal: preferred starting address of the region
 233  *
 234  * The goal is dropped if it can not be satisfied and the allocation will
 235  * fall back to memory below @goal.
 236  *
 237  * Allocation may happen on any node in the system.
 238  *
 239  * Returns NULL on failure.
 240  */
 241 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 242                                         unsigned long goal)
 243 {
 244         unsigned long limit = -1UL;
 245
 246         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 247 }
 248
 249 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 250                                         unsigned long goal, unsigned long limit)
 251 {
 252         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 253
 254         if (mem)
 255                 return mem;
 256         /*
 257          * Whoops, we cannot satisfy the allocation request.
 258          */
 259         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 260         panic("Out of memory");
 261         return NULL;
 262 }
 263
 264 /**
 265  * __alloc_bootmem - allocate boot memory
 266  * @size: size of the request in bytes
 267  * @align: alignment of the region
 268  * @goal: preferred starting address of the region
 269  *
 270  * The goal is dropped if it can not be satisfied and the allocation will
 271  * fall back to memory below @goal.
 272  *
 273  * Allocation may happen on any node in the system.
 274  *
 275  * The function panics if the request can not be satisfied.
 276  */
 277 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 278                               unsigned long goal)
 279 {
 280         unsigned long limit = -1UL;
 281
 282         return ___alloc_bootmem(size, align, goal, limit);
 283 }
 284
 285 /**
 286  * __alloc_bootmem_node - allocate boot memory from a specific node
 287  * @pgdat: node to allocate from
 288  * @size: size of the request in bytes
 289  * @align: alignment of the region
 290  * @goal: preferred starting address of the region
 291  *
 292  * The goal is dropped if it can not be satisfied and the allocation will
 293  * fall back to memory below @goal.
 294  *
 295  * Allocation may fall back to any node in the system if the specified node
 296  * can not hold the requested memory.
 297  *
 298  * The function panics if the request can not be satisfied.
 299  */
 300 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 301                                    unsigned long align, unsigned long goal)
 302 {
 303         void *ptr;
 304
 305         if (WARN_ON_ONCE(slab_is_available()))
 306                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 307
 308 again:
 309         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 310                                          goal, -1ULL);
 311         if (ptr)
 312                 return ptr;
 313
 314         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
 315                                         goal, -1ULL);
 316         if (!ptr && goal) {
 317                 goal = 0;
 318                 goto again;
 319         }
 320         return ptr;
 321 }
 322
 323 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 324                                    unsigned long align, unsigned long goal)
 325 {
 326         return __alloc_bootmem_node(pgdat, size, align, goal);
 327 }
 328
 329 #ifdef CONFIG_SPARSEMEM
 330 /**
 331  * alloc_bootmem_section - allocate boot memory from a specific section
 332  * @size: size of the request in bytes
 333  * @section_nr: sparse map section to allocate from
 334  *
 335  * Return NULL on failure.
 336  */
 337 void * __init alloc_bootmem_section(unsigned long size,
 338                                     unsigned long section_nr)
 339 {
 340         unsigned long pfn, goal, limit;
 341
 342         pfn = section_nr_to_pfn(section_nr);
 343         goal = pfn << PAGE_SHIFT;
 344         limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
 345
 346         return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
 347                                          SMP_CACHE_BYTES, goal, limit);
 348 }
 349 #endif
 350
 351 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 352                                    unsigned long align, unsigned long goal)
 353 {
 354         void *ptr;
 355
 356         if (WARN_ON_ONCE(slab_is_available()))
 357                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 358
 359         ptr =  __alloc_memory_core_early(pgdat->node_id, size, align,
 360                                                  goal, -1ULL);
 361         if (ptr)
 362                 return ptr;
 363
 364         return __alloc_bootmem_nopanic(size, align, goal);
 365 }
 366
 367 #ifndef ARCH_LOW_ADDRESS_LIMIT
 368 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 369 #endif
 370
 371 /**
 372  * __alloc_bootmem_low - allocate low boot memory
 373  * @size: size of the request in bytes
 374  * @align: alignment of the region
 375  * @goal: preferred starting address of the region
 376  *
 377  * The goal is dropped if it can not be satisfied and the allocation will
 378  * fall back to memory below @goal.
 379  *
 380  * Allocation may happen on any node in the system.
 381  *
 382  * The function panics if the request can not be satisfied.
 383  */
 384 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 385                                   unsigned long goal)
 386 {
 387         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 388 }
 389
 390 /**
 391  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 392  * @pgdat: node to allocate from
 393  * @size: size of the request in bytes
 394  * @align: alignment of the region
 395  * @goal: preferred starting address of the region
 396  *
 397  * The goal is dropped if it can not be satisfied and the allocation will
 398  * fall back to memory below @goal.
 399  *
 400  * Allocation may fall back to any node in the system if the specified node
 401  * can not hold the requested memory.
 402  *
 403  * The function panics if the request can not be satisfied.
 404  */
 405 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 406                                        unsigned long align, unsigned long goal)
 407 {
 408         void *ptr;
 409
 410         if (WARN_ON_ONCE(slab_is_available()))
 411                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 412
 413         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 414                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 415         if (ptr)
 416                 return ptr;
 417
 418         return  __alloc_memory_core_early(MAX_NUMNODES, size, align,
 419                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 420 }