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Linux/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/export.h>
 15 #include <linux/kmemleak.h>
 16 #include <linux/range.h>
 17 #include <linux/memblock.h>
 18 #include <linux/bootmem.h>
 19 
 20 #include <asm/bug.h>
 21 #include <asm/io.h>
 22 
 23 #include "internal.h"
 24 
 25 #ifndef CONFIG_HAVE_MEMBLOCK
 26 #error CONFIG_HAVE_MEMBLOCK not defined
 27 #endif
 28 
 29 #ifndef CONFIG_NEED_MULTIPLE_NODES
 30 struct pglist_data __refdata contig_page_data;
 31 EXPORT_SYMBOL(contig_page_data);
 32 #endif
 33 
 34 unsigned long max_low_pfn;
 35 unsigned long min_low_pfn;
 36 unsigned long max_pfn;
 37 unsigned long long max_possible_pfn;
 38 
 39 static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
 40                                         u64 goal, u64 limit)
 41 {
 42         void *ptr;
 43         u64 addr;
 44         ulong flags = choose_memblock_flags();
 45 
 46         if (limit > memblock.current_limit)
 47                 limit = memblock.current_limit;
 48 
 49 again:
 50         addr = memblock_find_in_range_node(size, align, goal, limit, nid,
 51                                            flags);
 52         if (!addr && (flags & MEMBLOCK_MIRROR)) {
 53                 flags &= ~MEMBLOCK_MIRROR;
 54                 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
 55                         &size);
 56                 goto again;
 57         }
 58         if (!addr)
 59                 return NULL;
 60 
 61         if (memblock_reserve(addr, size))
 62                 return NULL;
 63 
 64         ptr = phys_to_virt(addr);
 65         memset(ptr, 0, size);
 66         /*
 67          * The min_count is set to 0 so that bootmem allocated blocks
 68          * are never reported as leaks.
 69          */
 70         kmemleak_alloc(ptr, size, 0, 0);
 71         return ptr;
 72 }
 73 
 74 /*
 75  * free_bootmem_late - free bootmem pages directly to page allocator
 76  * @addr: starting address of the range
 77  * @size: size of the range in bytes
 78  *
 79  * This is only useful when the bootmem allocator has already been torn
 80  * down, but we are still initializing the system.  Pages are given directly
 81  * to the page allocator, no bootmem metadata is updated because it is gone.
 82  */
 83 void __init free_bootmem_late(unsigned long addr, unsigned long size)
 84 {
 85         unsigned long cursor, end;
 86 
 87         kmemleak_free_part_phys(addr, size);
 88 
 89         cursor = PFN_UP(addr);
 90         end = PFN_DOWN(addr + size);
 91 
 92         for (; cursor < end; cursor++) {
 93                 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
 94                 totalram_pages++;
 95         }
 96 }
 97 
 98 static void __init __free_pages_memory(unsigned long start, unsigned long end)
 99 {
100         int order;
101 
102         while (start < end) {
103                 order = min(MAX_ORDER - 1UL, __ffs(start));
104 
105                 while (start + (1UL << order) > end)
106                         order--;
107 
108                 __free_pages_bootmem(pfn_to_page(start), start, order);
109 
110                 start += (1UL << order);
111         }
112 }
113 
114 static unsigned long __init __free_memory_core(phys_addr_t start,
115                                  phys_addr_t end)
116 {
117         unsigned long start_pfn = PFN_UP(start);
118         unsigned long end_pfn = min_t(unsigned long,
119                                       PFN_DOWN(end), max_low_pfn);
120 
121         if (start_pfn > end_pfn)
122                 return 0;
123 
124         __free_pages_memory(start_pfn, end_pfn);
125 
126         return end_pfn - start_pfn;
127 }
128 
129 static unsigned long __init free_low_memory_core_early(void)
130 {
131         unsigned long count = 0;
132         phys_addr_t start, end;
133         u64 i;
134 
135         memblock_clear_hotplug(0, -1);
136 
137         for_each_reserved_mem_region(i, &start, &end)
138                 reserve_bootmem_region(start, end);
139 
140         /*
141          * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
142          *  because in some case like Node0 doesn't have RAM installed
143          *  low ram will be on Node1
144          */
145         for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
146                                 NULL)
147                 count += __free_memory_core(start, end);
148 
149 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
150         {
151                 phys_addr_t size;
152 
153                 /* Free memblock.reserved array if it was allocated */
154                 size = get_allocated_memblock_reserved_regions_info(&start);
155                 if (size)
156                         count += __free_memory_core(start, start + size);
157 
158                 /* Free memblock.memory array if it was allocated */
159                 size = get_allocated_memblock_memory_regions_info(&start);
160                 if (size)
161                         count += __free_memory_core(start, start + size);
162         }
163 #endif
164 
165         return count;
166 }
167 
168 static int reset_managed_pages_done __initdata;
169 
170 void reset_node_managed_pages(pg_data_t *pgdat)
171 {
172         struct zone *z;
173 
174         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
175                 z->managed_pages = 0;
176 }
177 
178 void __init reset_all_zones_managed_pages(void)
179 {
180         struct pglist_data *pgdat;
181 
182         if (reset_managed_pages_done)
183                 return;
184 
185         for_each_online_pgdat(pgdat)
186                 reset_node_managed_pages(pgdat);
187 
188         reset_managed_pages_done = 1;
189 }
190 
191 /**
192  * free_all_bootmem - release free pages to the buddy allocator
193  *
194  * Returns the number of pages actually released.
195  */
196 unsigned long __init free_all_bootmem(void)
197 {
198         unsigned long pages;
199 
200         reset_all_zones_managed_pages();
201 
202         pages = free_low_memory_core_early();
203         totalram_pages += pages;
204 
205         return pages;
206 }
207 
208 /**
209  * free_bootmem_node - mark a page range as usable
210  * @pgdat: node the range resides on
211  * @physaddr: starting address of the range
212  * @size: size of the range in bytes
213  *
214  * Partial pages will be considered reserved and left as they are.
215  *
216  * The range must reside completely on the specified node.
217  */
218 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
219                               unsigned long size)
220 {
221         memblock_free(physaddr, size);
222 }
223 
224 /**
225  * free_bootmem - mark a page range as usable
226  * @addr: starting address of the range
227  * @size: size of the range in bytes
228  *
229  * Partial pages will be considered reserved and left as they are.
230  *
231  * The range must be contiguous but may span node boundaries.
232  */
233 void __init free_bootmem(unsigned long addr, unsigned long size)
234 {
235         memblock_free(addr, size);
236 }
237 
238 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
239                                         unsigned long align,
240                                         unsigned long goal,
241                                         unsigned long limit)
242 {
243         void *ptr;
244 
245         if (WARN_ON_ONCE(slab_is_available()))
246                 return kzalloc(size, GFP_NOWAIT);
247 
248 restart:
249 
250         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
251 
252         if (ptr)
253                 return ptr;
254 
255         if (goal != 0) {
256                 goal = 0;
257                 goto restart;
258         }
259 
260         return NULL;
261 }
262 
263 /**
264  * __alloc_bootmem_nopanic - allocate boot memory without panicking
265  * @size: size of the request in bytes
266  * @align: alignment of the region
267  * @goal: preferred starting address of the region
268  *
269  * The goal is dropped if it can not be satisfied and the allocation will
270  * fall back to memory below @goal.
271  *
272  * Allocation may happen on any node in the system.
273  *
274  * Returns NULL on failure.
275  */
276 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
277                                         unsigned long goal)
278 {
279         unsigned long limit = -1UL;
280 
281         return ___alloc_bootmem_nopanic(size, align, goal, limit);
282 }
283 
284 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
285                                         unsigned long goal, unsigned long limit)
286 {
287         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
288 
289         if (mem)
290                 return mem;
291         /*
292          * Whoops, we cannot satisfy the allocation request.
293          */
294         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
295         panic("Out of memory");
296         return NULL;
297 }
298 
299 /**
300  * __alloc_bootmem - allocate boot memory
301  * @size: size of the request in bytes
302  * @align: alignment of the region
303  * @goal: preferred starting address of the region
304  *
305  * The goal is dropped if it can not be satisfied and the allocation will
306  * fall back to memory below @goal.
307  *
308  * Allocation may happen on any node in the system.
309  *
310  * The function panics if the request can not be satisfied.
311  */
312 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
313                               unsigned long goal)
314 {
315         unsigned long limit = -1UL;
316 
317         return ___alloc_bootmem(size, align, goal, limit);
318 }
319 
320 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
321                                                    unsigned long size,
322                                                    unsigned long align,
323                                                    unsigned long goal,
324                                                    unsigned long limit)
325 {
326         void *ptr;
327 
328 again:
329         ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
330                                         goal, limit);
331         if (ptr)
332                 return ptr;
333 
334         ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
335                                         goal, limit);
336         if (ptr)
337                 return ptr;
338 
339         if (goal) {
340                 goal = 0;
341                 goto again;
342         }
343 
344         return NULL;
345 }
346 
347 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
348                                    unsigned long align, unsigned long goal)
349 {
350         if (WARN_ON_ONCE(slab_is_available()))
351                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
352 
353         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
354 }
355 
356 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
357                                     unsigned long align, unsigned long goal,
358                                     unsigned long limit)
359 {
360         void *ptr;
361 
362         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
363         if (ptr)
364                 return ptr;
365 
366         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
367         panic("Out of memory");
368         return NULL;
369 }
370 
371 /**
372  * __alloc_bootmem_node - allocate boot memory from a specific node
373  * @pgdat: node to allocate from
374  * @size: size of the request in bytes
375  * @align: alignment of the region
376  * @goal: preferred starting address of the region
377  *
378  * The goal is dropped if it can not be satisfied and the allocation will
379  * fall back to memory below @goal.
380  *
381  * Allocation may fall back to any node in the system if the specified node
382  * can not hold the requested memory.
383  *
384  * The function panics if the request can not be satisfied.
385  */
386 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
387                                    unsigned long align, unsigned long goal)
388 {
389         if (WARN_ON_ONCE(slab_is_available()))
390                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
391 
392         return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
393 }
394 
395 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
396                                    unsigned long align, unsigned long goal)
397 {
398         return __alloc_bootmem_node(pgdat, size, align, goal);
399 }
400 
401 
402 /**
403  * __alloc_bootmem_low - allocate low boot memory
404  * @size: size of the request in bytes
405  * @align: alignment of the region
406  * @goal: preferred starting address of the region
407  *
408  * The goal is dropped if it can not be satisfied and the allocation will
409  * fall back to memory below @goal.
410  *
411  * Allocation may happen on any node in the system.
412  *
413  * The function panics if the request can not be satisfied.
414  */
415 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
416                                   unsigned long goal)
417 {
418         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
419 }
420 
421 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
422                                           unsigned long align,
423                                           unsigned long goal)
424 {
425         return ___alloc_bootmem_nopanic(size, align, goal,
426                                         ARCH_LOW_ADDRESS_LIMIT);
427 }
428 
429 /**
430  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
431  * @pgdat: node to allocate from
432  * @size: size of the request in bytes
433  * @align: alignment of the region
434  * @goal: preferred starting address of the region
435  *
436  * The goal is dropped if it can not be satisfied and the allocation will
437  * fall back to memory below @goal.
438  *
439  * Allocation may fall back to any node in the system if the specified node
440  * can not hold the requested memory.
441  *
442  * The function panics if the request can not be satisfied.
443  */
444 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
445                                        unsigned long align, unsigned long goal)
446 {
447         if (WARN_ON_ONCE(slab_is_available()))
448                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
449 
450         return ___alloc_bootmem_node(pgdat, size, align, goal,
451                                      ARCH_LOW_ADDRESS_LIMIT);
452 }
453 

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