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