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         int i;
  86         unsigned long start_aligned, end_aligned;
  87         int order = ilog2(BITS_PER_LONG);
  88
  89         start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
  90         end_aligned = end & ~(BITS_PER_LONG - 1);
  91
  92         if (end_aligned <= start_aligned) {
  93                 for (i = start; i < end; i++)
  94                         __free_pages_bootmem(pfn_to_page(i), 0);
  95
  96                 return;
  97         }
  98
  99         for (i = start; i < start_aligned; i++)
 100                 __free_pages_bootmem(pfn_to_page(i), 0);
 101
 102         for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
 103                 __free_pages_bootmem(pfn_to_page(i), order);
 104
 105         for (i = end_aligned; i < end; i++)
 106                 __free_pages_bootmem(pfn_to_page(i), 0);
 107 }
 108
 109 unsigned long __init free_low_memory_core_early(int nodeid)
 110 {
 111         unsigned long count = 0;
 112         phys_addr_t start, end;
 113         u64 i;
 114
 115         /* free reserved array temporarily so that it's treated as free area */
 116         memblock_free_reserved_regions();
 117
 118         for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
 119                 unsigned long start_pfn = PFN_UP(start);
 120                 unsigned long end_pfn = min_t(unsigned long,
 121                                               PFN_DOWN(end), max_low_pfn);
 122                 if (start_pfn < end_pfn) {
 123                         __free_pages_memory(start_pfn, end_pfn);
 124                         count += end_pfn - start_pfn;
 125                 }
 126         }
 127
 128         /* put region array back? */
 129         memblock_reserve_reserved_regions();
 130         return count;
 131 }
 132
 133 /**
 134  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 135  * @pgdat: node to be released
 136  *
 137  * Returns the number of pages actually released.
 138  */
 139 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 140 {
 141         register_page_bootmem_info_node(pgdat);
 142
 143         /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
 144         return 0;
 145 }
 146
 147 /**
 148  * free_all_bootmem - release free pages to the buddy allocator
 149  *
 150  * Returns the number of pages actually released.
 151  */
 152 unsigned long __init free_all_bootmem(void)
 153 {
 154         /*
 155          * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
 156          *  because in some case like Node0 doesn't have RAM installed
 157          *  low ram will be on Node1
 158          * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
 159          *  will be used instead of only Node0 related
 160          */
 161         return free_low_memory_core_early(MAX_NUMNODES);
 162 }
 163
 164 /**
 165  * free_bootmem_node - mark a page range as usable
 166  * @pgdat: node the range resides on
 167  * @physaddr: starting address of the range
 168  * @size: size of the range in bytes
 169  *
 170  * Partial pages will be considered reserved and left as they are.
 171  *
 172  * The range must reside completely on the specified node.
 173  */
 174 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 175                               unsigned long size)
 176 {
 177         kmemleak_free_part(__va(physaddr), size);
 178         memblock_free(physaddr, size);
 179 }
 180
 181 /**
 182  * free_bootmem - mark a page range as usable
 183  * @addr: starting address of the range
 184  * @size: size of the range in bytes
 185  *
 186  * Partial pages will be considered reserved and left as they are.
 187  *
 188  * The range must be contiguous but may span node boundaries.
 189  */
 190 void __init free_bootmem(unsigned long addr, unsigned long size)
 191 {
 192         kmemleak_free_part(__va(addr), size);
 193         memblock_free(addr, size);
 194 }
 195
 196 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 197                                         unsigned long align,
 198                                         unsigned long goal,
 199                                         unsigned long limit)
 200 {
 201         void *ptr;
 202
 203         if (WARN_ON_ONCE(slab_is_available()))
 204                 return kzalloc(size, GFP_NOWAIT);
 205
 206 restart:
 207
 208         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
 209
 210         if (ptr)
 211                 return ptr;
 212
 213         if (goal != 0) {
 214                 goal = 0;
 215                 goto restart;
 216         }
 217
 218         return NULL;
 219 }
 220
 221 /**
 222  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 223  * @size: size of the request in bytes
 224  * @align: alignment of the region
 225  * @goal: preferred starting address of the region
 226  *
 227  * The goal is dropped if it can not be satisfied and the allocation will
 228  * fall back to memory below @goal.
 229  *
 230  * Allocation may happen on any node in the system.
 231  *
 232  * Returns NULL on failure.
 233  */
 234 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 235                                         unsigned long goal)
 236 {
 237         unsigned long limit = -1UL;
 238
 239         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 240 }
 241
 242 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 243                                         unsigned long goal, unsigned long limit)
 244 {
 245         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 246
 247         if (mem)
 248                 return mem;
 249         /*
 250          * Whoops, we cannot satisfy the allocation request.
 251          */
 252         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 253         panic("Out of memory");
 254         return NULL;
 255 }
 256
 257 /**
 258  * __alloc_bootmem - allocate boot memory
 259  * @size: size of the request in bytes
 260  * @align: alignment of the region
 261  * @goal: preferred starting address of the region
 262  *
 263  * The goal is dropped if it can not be satisfied and the allocation will
 264  * fall back to memory below @goal.
 265  *
 266  * Allocation may happen on any node in the system.
 267  *
 268  * The function panics if the request can not be satisfied.
 269  */
 270 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 271                               unsigned long goal)
 272 {
 273         unsigned long limit = -1UL;
 274
 275         return ___alloc_bootmem(size, align, goal, limit);
 276 }
 277
 278 /**
 279  * __alloc_bootmem_node - allocate boot memory from a specific node
 280  * @pgdat: node to allocate from
 281  * @size: size of the request in bytes
 282  * @align: alignment of the region
 283  * @goal: preferred starting address of the region
 284  *
 285  * The goal is dropped if it can not be satisfied and the allocation will
 286  * fall back to memory below @goal.
 287  *
 288  * Allocation may fall back to any node in the system if the specified node
 289  * can not hold the requested memory.
 290  *
 291  * The function panics if the request can not be satisfied.
 292  */
 293 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 294                                    unsigned long align, unsigned long goal)
 295 {
 296         void *ptr;
 297
 298         if (WARN_ON_ONCE(slab_is_available()))
 299                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 300
 301         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 302                                          goal, -1ULL);
 303         if (ptr)
 304                 return ptr;
 305
 306         return __alloc_memory_core_early(MAX_NUMNODES, size, align,
 307                                          goal, -1ULL);
 308 }
 309
 310 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 311                                    unsigned long align, unsigned long goal)
 312 {
 313         return __alloc_bootmem_node(pgdat, size, align, goal);
 314 }
 315
 316 #ifdef CONFIG_SPARSEMEM
 317 /**
 318  * alloc_bootmem_section - allocate boot memory from a specific section
 319  * @size: size of the request in bytes
 320  * @section_nr: sparse map section to allocate from
 321  *
 322  * Return NULL on failure.
 323  */
 324 void * __init alloc_bootmem_section(unsigned long size,
 325                                     unsigned long section_nr)
 326 {
 327         unsigned long pfn, goal, limit;
 328
 329         pfn = section_nr_to_pfn(section_nr);
 330         goal = pfn << PAGE_SHIFT;
 331         limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
 332
 333         return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
 334                                          SMP_CACHE_BYTES, goal, limit);
 335 }
 336 #endif
 337
 338 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 339                                    unsigned long align, unsigned long goal)
 340 {
 341         void *ptr;
 342
 343         if (WARN_ON_ONCE(slab_is_available()))
 344                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 345
 346         ptr =  __alloc_memory_core_early(pgdat->node_id, size, align,
 347                                                  goal, -1ULL);
 348         if (ptr)
 349                 return ptr;
 350
 351         return __alloc_bootmem_nopanic(size, align, goal);
 352 }
 353
 354 #ifndef ARCH_LOW_ADDRESS_LIMIT
 355 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 356 #endif
 357
 358 /**
 359  * __alloc_bootmem_low - allocate low boot memory
 360  * @size: size of the request in bytes
 361  * @align: alignment of the region
 362  * @goal: preferred starting address of the region
 363  *
 364  * The goal is dropped if it can not be satisfied and the allocation will
 365  * fall back to memory below @goal.
 366  *
 367  * Allocation may happen on any node in the system.
 368  *
 369  * The function panics if the request can not be satisfied.
 370  */
 371 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 372                                   unsigned long goal)
 373 {
 374         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 375 }
 376
 377 /**
 378  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 379  * @pgdat: node to allocate from
 380  * @size: size of the request in bytes
 381  * @align: alignment of the region
 382  * @goal: preferred starting address of the region
 383  *
 384  * The goal is dropped if it can not be satisfied and the allocation will
 385  * fall back to memory below @goal.
 386  *
 387  * Allocation may fall back to any node in the system if the specified node
 388  * can not hold the requested memory.
 389  *
 390  * The function panics if the request can not be satisfied.
 391  */
 392 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 393                                        unsigned long align, unsigned long goal)
 394 {
 395         void *ptr;
 396
 397         if (WARN_ON_ONCE(slab_is_available()))
 398                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 399
 400         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
 401                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 402         if (ptr)
 403                 return ptr;
 404
 405         return  __alloc_memory_core_early(MAX_NUMNODES, size, align,
 406                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 407 }