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         fixup_zone_present_pages(pfn_to_nid(start >> PAGE_SHIFT),
 120                         start_pfn, end_pfn);
 121
 122         return end_pfn - start_pfn;
 123 }
 124
 125 unsigned long __init free_low_memory_core_early(int nodeid)
 126 {
 127         unsigned long count = 0;
 128         phys_addr_t start, end, size;
 129         u64 i;
 130
 131         reset_zone_present_pages();
 132         for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
 133                 count += __free_memory_core(start, end);
 134
 135         /* free range that is used for reserved array if we allocate it */
 136         size = get_allocated_memblock_reserved_regions_info(&start);
 137         if (size)
 138                 count += __free_memory_core(start, start + size);
 139
 140         return count;
 141 }
 142
 143 /**
 144  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 145  * @pgdat: node to be released
 146  *
 147  * Returns the number of pages actually released.
 148  */
 149 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 150 {
 151         register_page_bootmem_info_node(pgdat);
 152
 153         /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
 154         return 0;
 155 }
 156
 157 /**
 158  * free_all_bootmem - release free pages to the buddy allocator
 159  *
 160  * Returns the number of pages actually released.
 161  */
 162 unsigned long __init free_all_bootmem(void)
 163 {
 164         /*
 165          * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
 166          *  because in some case like Node0 doesn't have RAM installed
 167          *  low ram will be on Node1
 168          */
 169         return free_low_memory_core_early(MAX_NUMNODES);
 170 }
 171
 172 /**
 173  * free_bootmem_node - mark a page range as usable
 174  * @pgdat: node the range resides on
 175  * @physaddr: starting address of the range
 176  * @size: size of the range in bytes
 177  *
 178  * Partial pages will be considered reserved and left as they are.
 179  *
 180  * The range must reside completely on the specified node.
 181  */
 182 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 183                               unsigned long size)
 184 {
 185         kmemleak_free_part(__va(physaddr), size);
 186         memblock_free(physaddr, size);
 187 }
 188
 189 /**
 190  * free_bootmem - mark a page range as usable
 191  * @addr: starting address of the range
 192  * @size: size of the range in bytes
 193  *
 194  * Partial pages will be considered reserved and left as they are.
 195  *
 196  * The range must be contiguous but may span node boundaries.
 197  */
 198 void __init free_bootmem(unsigned long addr, unsigned long size)
 199 {
 200         kmemleak_free_part(__va(addr), size);
 201         memblock_free(addr, size);
 202 }
 203
 204 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 205                                         unsigned long align,
 206                                         unsigned long goal,
 207                                         unsigned long limit)
 208 {
 209         void *ptr;
 210
 211         if (WARN_ON_ONCE(slab_is_available()))
 212                 return kzalloc(size, GFP_NOWAIT);
 213
 214 restart:
 215
 216         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
 217
 218         if (ptr)
 219                 return ptr;
 220
 221         if (goal != 0) {
 222                 goal = 0;
 223                 goto restart;
 224         }
 225
 226         return NULL;
 227 }
 228
 229 /**
 230  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 231  * @size: size of the request in bytes
 232  * @align: alignment of the region
 233  * @goal: preferred starting address of the region
 234  *
 235  * The goal is dropped if it can not be satisfied and the allocation will
 236  * fall back to memory below @goal.
 237  *
 238  * Allocation may happen on any node in the system.
 239  *
 240  * Returns NULL on failure.
 241  */
 242 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 243                                         unsigned long goal)
 244 {
 245         unsigned long limit = -1UL;
 246
 247         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 248 }
 249
 250 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 251                                         unsigned long goal, unsigned long limit)
 252 {
 253         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 254
 255         if (mem)
 256                 return mem;
 257         /*
 258          * Whoops, we cannot satisfy the allocation request.
 259          */
 260         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 261         panic("Out of memory");
 262         return NULL;
 263 }
 264
 265 /**
 266  * __alloc_bootmem - allocate boot memory
 267  * @size: size of the request in bytes
 268  * @align: alignment of the region
 269  * @goal: preferred starting address of the region
 270  *
 271  * The goal is dropped if it can not be satisfied and the allocation will
 272  * fall back to memory below @goal.
 273  *
 274  * Allocation may happen on any node in the system.
 275  *
 276  * The function panics if the request can not be satisfied.
 277  */
 278 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 279                               unsigned long goal)
 280 {
 281         unsigned long limit = -1UL;
 282
 283         return ___alloc_bootmem(size, align, goal, limit);
 284 }
 285
 286 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 287                                                    unsigned long size,
 288                                                    unsigned long align,
 289                                                    unsigned long goal,
 290                                                    unsigned long limit)
 291 {
 292         void *ptr;
 293
 294 again:
 295         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 296                                         goal, limit);
 297         if (ptr)
 298                 return ptr;
 299
 300         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
 301                                         goal, limit);
 302         if (ptr)
 303                 return ptr;
 304
 305         if (goal) {
 306                 goal = 0;
 307                 goto again;
 308         }
 309
 310         return NULL;
 311 }
 312
 313 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 314                                    unsigned long align, unsigned long goal)
 315 {
 316         if (WARN_ON_ONCE(slab_is_available()))
 317                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 318
 319         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 320 }
 321
 322 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 323                                     unsigned long align, unsigned long goal,
 324                                     unsigned long limit)
 325 {
 326         void *ptr;
 327
 328         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
 329         if (ptr)
 330                 return ptr;
 331
 332         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 333         panic("Out of memory");
 334         return NULL;
 335 }
 336
 337 /**
 338  * __alloc_bootmem_node - allocate boot memory from a specific node
 339  * @pgdat: node to allocate from
 340  * @size: size of the request in bytes
 341  * @align: alignment of the region
 342  * @goal: preferred starting address of the region
 343  *
 344  * The goal is dropped if it can not be satisfied and the allocation will
 345  * fall back to memory below @goal.
 346  *
 347  * Allocation may fall back to any node in the system if the specified node
 348  * can not hold the requested memory.
 349  *
 350  * The function panics if the request can not be satisfied.
 351  */
 352 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 353                                    unsigned long align, unsigned long goal)
 354 {
 355         if (WARN_ON_ONCE(slab_is_available()))
 356                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 357
 358         return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 359 }
 360
 361 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 362                                    unsigned long align, unsigned long goal)
 363 {
 364         return __alloc_bootmem_node(pgdat, 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         if (WARN_ON_ONCE(slab_is_available()))
 409                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 410
 411         return ___alloc_bootmem_node(pgdat, size, align, goal,
 412                                      ARCH_LOW_ADDRESS_LIMIT);
 413 }