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TOMOYO Linux Cross Reference
Linux/mm/nobootmem.c

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  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(size, align, goal, limit, nid);
 45         if (!addr)
 46                 return NULL;
 47 
 48         if (memblock_reserve(addr, size))
 49                 return NULL;
 50 
 51         ptr = phys_to_virt(addr);
 52         memset(ptr, 0, size);
 53         /*
 54          * The min_count is set to 0 so that bootmem allocated blocks
 55          * are never reported as leaks.
 56          */
 57         kmemleak_alloc(ptr, size, 0, 0);
 58         return ptr;
 59 }
 60 
 61 /*
 62  * free_bootmem_late - free bootmem pages directly to page allocator
 63  * @addr: starting address of the range
 64  * @size: size of the range in bytes
 65  *
 66  * This is only useful when the bootmem allocator has already been torn
 67  * down, but we are still initializing the system.  Pages are given directly
 68  * to the page allocator, no bootmem metadata is updated because it is gone.
 69  */
 70 void __init free_bootmem_late(unsigned long addr, unsigned long size)
 71 {
 72         unsigned long cursor, end;
 73 
 74         kmemleak_free_part(__va(addr), size);
 75 
 76         cursor = PFN_UP(addr);
 77         end = PFN_DOWN(addr + size);
 78 
 79         for (; cursor < end; cursor++) {
 80                 __free_pages_bootmem(pfn_to_page(cursor), 0);
 81                 totalram_pages++;
 82         }
 83 }
 84 
 85 static void __init __free_pages_memory(unsigned long start, unsigned long end)
 86 {
 87         int order;
 88 
 89         while (start < end) {
 90                 order = min(MAX_ORDER - 1UL, __ffs(start));
 91 
 92                 while (start + (1UL << order) > end)
 93                         order--;
 94 
 95                 __free_pages_bootmem(pfn_to_page(start), order);
 96 
 97                 start += (1UL << order);
 98         }
 99 }
100 
101 static unsigned long __init __free_memory_core(phys_addr_t start,
102                                  phys_addr_t end)
103 {
104         unsigned long start_pfn = PFN_UP(start);
105         unsigned long end_pfn = min_t(unsigned long,
106                                       PFN_DOWN(end), max_low_pfn);
107 
108         if (start_pfn > end_pfn)
109                 return 0;
110 
111         __free_pages_memory(start_pfn, end_pfn);
112 
113         return end_pfn - start_pfn;
114 }
115 
116 static unsigned long __init free_low_memory_core_early(void)
117 {
118         unsigned long count = 0;
119         phys_addr_t start, end;
120         u64 i;
121 
122         for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
123                 count += __free_memory_core(start, end);
124 
125 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
126         {
127                 phys_addr_t size;
128 
129                 /* Free memblock.reserved array if it was allocated */
130                 size = get_allocated_memblock_reserved_regions_info(&start);
131                 if (size)
132                         count += __free_memory_core(start, start + size);
133 
134                 /* Free memblock.memory array if it was allocated */
135                 size = get_allocated_memblock_memory_regions_info(&start);
136                 if (size)
137                         count += __free_memory_core(start, start + size);
138         }
139 #endif
140 
141         return count;
142 }
143 
144 static int reset_managed_pages_done __initdata;
145 
146 static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
147 {
148         struct zone *z;
149 
150         if (reset_managed_pages_done)
151                 return;
152         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
153                 z->managed_pages = 0;
154 }
155 
156 void __init reset_all_zones_managed_pages(void)
157 {
158         struct pglist_data *pgdat;
159 
160         for_each_online_pgdat(pgdat)
161                 reset_node_managed_pages(pgdat);
162         reset_managed_pages_done = 1;
163 }
164 
165 /**
166  * free_all_bootmem - release free pages to the buddy allocator
167  *
168  * Returns the number of pages actually released.
169  */
170 unsigned long __init free_all_bootmem(void)
171 {
172         unsigned long pages;
173 
174         reset_all_zones_managed_pages();
175 
176         /*
177          * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
178          *  because in some case like Node0 doesn't have RAM installed
179          *  low ram will be on Node1
180          */
181         pages = free_low_memory_core_early();
182         totalram_pages += pages;
183 
184         return pages;
185 }
186 
187 /**
188  * free_bootmem_node - mark a page range as usable
189  * @pgdat: node the range resides on
190  * @physaddr: 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 reside completely on the specified node.
196  */
197 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
198                               unsigned long size)
199 {
200         kmemleak_free_part(__va(physaddr), size);
201         memblock_free(physaddr, size);
202 }
203 
204 /**
205  * free_bootmem - mark a page range as usable
206  * @addr: starting address of the range
207  * @size: size of the range in bytes
208  *
209  * Partial pages will be considered reserved and left as they are.
210  *
211  * The range must be contiguous but may span node boundaries.
212  */
213 void __init free_bootmem(unsigned long addr, unsigned long size)
214 {
215         kmemleak_free_part(__va(addr), size);
216         memblock_free(addr, size);
217 }
218 
219 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
220                                         unsigned long align,
221                                         unsigned long goal,
222                                         unsigned long limit)
223 {
224         void *ptr;
225 
226         if (WARN_ON_ONCE(slab_is_available()))
227                 return kzalloc(size, GFP_NOWAIT);
228 
229 restart:
230 
231         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
232 
233         if (ptr)
234                 return ptr;
235 
236         if (goal != 0) {
237                 goal = 0;
238                 goto restart;
239         }
240 
241         return NULL;
242 }
243 
244 /**
245  * __alloc_bootmem_nopanic - allocate boot memory without panicking
246  * @size: size of the request in bytes
247  * @align: alignment of the region
248  * @goal: preferred starting address of the region
249  *
250  * The goal is dropped if it can not be satisfied and the allocation will
251  * fall back to memory below @goal.
252  *
253  * Allocation may happen on any node in the system.
254  *
255  * Returns NULL on failure.
256  */
257 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
258                                         unsigned long goal)
259 {
260         unsigned long limit = -1UL;
261 
262         return ___alloc_bootmem_nopanic(size, align, goal, limit);
263 }
264 
265 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
266                                         unsigned long goal, unsigned long limit)
267 {
268         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
269 
270         if (mem)
271                 return mem;
272         /*
273          * Whoops, we cannot satisfy the allocation request.
274          */
275         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
276         panic("Out of memory");
277         return NULL;
278 }
279 
280 /**
281  * __alloc_bootmem - allocate boot memory
282  * @size: size of the request in bytes
283  * @align: alignment of the region
284  * @goal: preferred starting address of the region
285  *
286  * The goal is dropped if it can not be satisfied and the allocation will
287  * fall back to memory below @goal.
288  *
289  * Allocation may happen on any node in the system.
290  *
291  * The function panics if the request can not be satisfied.
292  */
293 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
294                               unsigned long goal)
295 {
296         unsigned long limit = -1UL;
297 
298         return ___alloc_bootmem(size, align, goal, limit);
299 }
300 
301 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
302                                                    unsigned long size,
303                                                    unsigned long align,
304                                                    unsigned long goal,
305                                                    unsigned long limit)
306 {
307         void *ptr;
308 
309 again:
310         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
311                                         goal, limit);
312         if (ptr)
313                 return ptr;
314 
315         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
316                                         goal, limit);
317         if (ptr)
318                 return ptr;
319 
320         if (goal) {
321                 goal = 0;
322                 goto again;
323         }
324 
325         return NULL;
326 }
327 
328 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
329                                    unsigned long align, unsigned long goal)
330 {
331         if (WARN_ON_ONCE(slab_is_available()))
332                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
333 
334         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
335 }
336 
337 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
338                                     unsigned long align, unsigned long goal,
339                                     unsigned long limit)
340 {
341         void *ptr;
342 
343         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
344         if (ptr)
345                 return ptr;
346 
347         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
348         panic("Out of memory");
349         return NULL;
350 }
351 
352 /**
353  * __alloc_bootmem_node - allocate boot memory from a specific node
354  * @pgdat: node to allocate from
355  * @size: size of the request in bytes
356  * @align: alignment of the region
357  * @goal: preferred starting address of the region
358  *
359  * The goal is dropped if it can not be satisfied and the allocation will
360  * fall back to memory below @goal.
361  *
362  * Allocation may fall back to any node in the system if the specified node
363  * can not hold the requested memory.
364  *
365  * The function panics if the request can not be satisfied.
366  */
367 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
368                                    unsigned long align, unsigned long goal)
369 {
370         if (WARN_ON_ONCE(slab_is_available()))
371                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
372 
373         return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
374 }
375 
376 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
377                                    unsigned long align, unsigned long goal)
378 {
379         return __alloc_bootmem_node(pgdat, size, align, goal);
380 }
381 
382 #ifndef ARCH_LOW_ADDRESS_LIMIT
383 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
384 #endif
385 
386 /**
387  * __alloc_bootmem_low - allocate low boot memory
388  * @size: size of the request in bytes
389  * @align: alignment of the region
390  * @goal: preferred starting address of the region
391  *
392  * The goal is dropped if it can not be satisfied and the allocation will
393  * fall back to memory below @goal.
394  *
395  * Allocation may happen on any node in the system.
396  *
397  * The function panics if the request can not be satisfied.
398  */
399 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
400                                   unsigned long goal)
401 {
402         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
403 }
404 
405 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
406                                           unsigned long align,
407                                           unsigned long goal)
408 {
409         return ___alloc_bootmem_nopanic(size, align, goal,
410                                         ARCH_LOW_ADDRESS_LIMIT);
411 }
412 
413 /**
414  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
415  * @pgdat: node to allocate from
416  * @size: size of the request in bytes
417  * @align: alignment of the region
418  * @goal: preferred starting address of the region
419  *
420  * The goal is dropped if it can not be satisfied and the allocation will
421  * fall back to memory below @goal.
422  *
423  * Allocation may fall back to any node in the system if the specified node
424  * can not hold the requested memory.
425  *
426  * The function panics if the request can not be satisfied.
427  */
428 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
429                                        unsigned long align, unsigned long goal)
430 {
431         if (WARN_ON_ONCE(slab_is_available()))
432                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
433 
434         return ___alloc_bootmem_node(pgdat, size, align, goal,
435                                      ARCH_LOW_ADDRESS_LIMIT);
436 }
437 

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