blob: 36511c7b5e2c797067ccb539646f580aa8ec1012 [file] [log] [blame]
Andy Whitcroftd41dee32005-06-23 00:07:54 -07001/*
2 * sparse memory mappings.
3 */
Andy Whitcroftd41dee32005-06-23 00:07:54 -07004#include <linux/mm.h>
5#include <linux/mmzone.h>
6#include <linux/bootmem.h>
Dave Hansen0b0acbe2005-10-29 18:16:55 -07007#include <linux/highmem.h>
Andy Whitcroftd41dee32005-06-23 00:07:54 -07008#include <linux/module.h>
Dave Hansen28ae55c2005-09-03 15:54:29 -07009#include <linux/spinlock.h>
Dave Hansen0b0acbe2005-10-29 18:16:55 -070010#include <linux/vmalloc.h>
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070011#include "internal.h"
Andy Whitcroftd41dee32005-06-23 00:07:54 -070012#include <asm/dma.h>
Christoph Lameter8f6aac42007-10-16 01:24:13 -070013#include <asm/pgalloc.h>
14#include <asm/pgtable.h>
Andy Whitcroftd41dee32005-06-23 00:07:54 -070015
16/*
17 * Permanent SPARSEMEM data:
18 *
19 * 1) mem_section - memory sections, mem_map's for valid memory
20 */
Bob Picco3e347262005-09-03 15:54:28 -070021#ifdef CONFIG_SPARSEMEM_EXTREME
Bob Picco802f1922005-09-03 15:54:26 -070022struct mem_section *mem_section[NR_SECTION_ROOTS]
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080023 ____cacheline_internodealigned_in_smp;
Bob Picco3e347262005-09-03 15:54:28 -070024#else
25struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080026 ____cacheline_internodealigned_in_smp;
Bob Picco3e347262005-09-03 15:54:28 -070027#endif
28EXPORT_SYMBOL(mem_section);
29
Christoph Lameter89689ae2006-12-06 20:31:45 -080030#ifdef NODE_NOT_IN_PAGE_FLAGS
31/*
32 * If we did not store the node number in the page then we have to
33 * do a lookup in the section_to_node_table in order to find which
34 * node the page belongs to.
35 */
36#if MAX_NUMNODES <= 256
37static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
38#else
39static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
40#endif
41
Andy Whitcroft25ba77c2006-12-06 20:33:03 -080042int page_to_nid(struct page *page)
Christoph Lameter89689ae2006-12-06 20:31:45 -080043{
44 return section_to_node_table[page_to_section(page)];
45}
46EXPORT_SYMBOL(page_to_nid);
Andy Whitcroft85770ff2007-08-22 14:01:03 -070047
48static void set_section_nid(unsigned long section_nr, int nid)
49{
50 section_to_node_table[section_nr] = nid;
51}
52#else /* !NODE_NOT_IN_PAGE_FLAGS */
53static inline void set_section_nid(unsigned long section_nr, int nid)
54{
55}
Christoph Lameter89689ae2006-12-06 20:31:45 -080056#endif
57
Bob Picco3e347262005-09-03 15:54:28 -070058#ifdef CONFIG_SPARSEMEM_EXTREME
Sam Ravnborg577a32f2007-05-17 23:29:25 +020059static struct mem_section noinline __init_refok *sparse_index_alloc(int nid)
Bob Picco802f1922005-09-03 15:54:26 -070060{
Dave Hansen28ae55c2005-09-03 15:54:29 -070061 struct mem_section *section = NULL;
62 unsigned long array_size = SECTIONS_PER_ROOT *
63 sizeof(struct mem_section);
Bob Picco802f1922005-09-03 15:54:26 -070064
Mike Kravetz39d24e62006-05-15 09:44:13 -070065 if (slab_is_available())
Mike Kravetz46a66ee2006-05-01 12:16:09 -070066 section = kmalloc_node(array_size, GFP_KERNEL, nid);
67 else
68 section = alloc_bootmem_node(NODE_DATA(nid), array_size);
Bob Picco3e347262005-09-03 15:54:28 -070069
Dave Hansen28ae55c2005-09-03 15:54:29 -070070 if (section)
71 memset(section, 0, array_size);
Bob Picco3e347262005-09-03 15:54:28 -070072
Dave Hansen28ae55c2005-09-03 15:54:29 -070073 return section;
Bob Picco802f1922005-09-03 15:54:26 -070074}
Dave Hansen28ae55c2005-09-03 15:54:29 -070075
Yasunori Gotoa3142c82007-05-08 00:23:07 -070076static int __meminit sparse_index_init(unsigned long section_nr, int nid)
Dave Hansen28ae55c2005-09-03 15:54:29 -070077{
Ingo Molnar34af9462006-06-27 02:53:55 -070078 static DEFINE_SPINLOCK(index_init_lock);
Dave Hansen28ae55c2005-09-03 15:54:29 -070079 unsigned long root = SECTION_NR_TO_ROOT(section_nr);
80 struct mem_section *section;
81 int ret = 0;
82
83 if (mem_section[root])
84 return -EEXIST;
85
86 section = sparse_index_alloc(nid);
WANG Congaf0cd5a2007-12-17 16:19:58 -080087 if (!section)
88 return -ENOMEM;
Dave Hansen28ae55c2005-09-03 15:54:29 -070089 /*
90 * This lock keeps two different sections from
91 * reallocating for the same index
92 */
93 spin_lock(&index_init_lock);
94
95 if (mem_section[root]) {
96 ret = -EEXIST;
97 goto out;
98 }
99
100 mem_section[root] = section;
101out:
102 spin_unlock(&index_init_lock);
103 return ret;
104}
105#else /* !SPARSEMEM_EXTREME */
106static inline int sparse_index_init(unsigned long section_nr, int nid)
107{
108 return 0;
109}
110#endif
111
Dave Hansen4ca644d2005-10-29 18:16:51 -0700112/*
113 * Although written for the SPARSEMEM_EXTREME case, this happens
Andy Whitcroftcd881a62007-10-16 01:24:10 -0700114 * to also work for the flat array case because
Dave Hansen4ca644d2005-10-29 18:16:51 -0700115 * NR_SECTION_ROOTS==NR_MEM_SECTIONS.
116 */
117int __section_nr(struct mem_section* ms)
118{
119 unsigned long root_nr;
120 struct mem_section* root;
121
Mike Kravetz12783b02006-05-20 15:00:05 -0700122 for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) {
123 root = __nr_to_section(root_nr * SECTIONS_PER_ROOT);
Dave Hansen4ca644d2005-10-29 18:16:51 -0700124 if (!root)
125 continue;
126
127 if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT)))
128 break;
129 }
130
131 return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
132}
133
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700134/*
135 * During early boot, before section_mem_map is used for an actual
136 * mem_map, we use section_mem_map to store the section's NUMA
137 * node. This keeps us from having to use another data structure. The
138 * node information is cleared just before we store the real mem_map.
139 */
140static inline unsigned long sparse_encode_early_nid(int nid)
141{
142 return (nid << SECTION_NID_SHIFT);
143}
144
145static inline int sparse_early_nid(struct mem_section *section)
146{
147 return (section->section_mem_map >> SECTION_NID_SHIFT);
148}
149
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700150/* Record a memory area against a node. */
Yasunori Gotoa3142c82007-05-08 00:23:07 -0700151void __init memory_present(int nid, unsigned long start, unsigned long end)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700152{
Ingo Molnarbead9a32008-04-16 01:40:00 +0200153 unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700154 unsigned long pfn;
155
Ingo Molnarbead9a32008-04-16 01:40:00 +0200156 /*
157 * Sanity checks - do not allow an architecture to pass
158 * in larger pfns than the maximum scope of sparsemem:
159 */
160 if (start >= max_arch_pfn)
161 return;
162 if (end >= max_arch_pfn)
163 end = max_arch_pfn;
164
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700165 start &= PAGE_SECTION_MASK;
166 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
167 unsigned long section = pfn_to_section_nr(pfn);
Bob Picco802f1922005-09-03 15:54:26 -0700168 struct mem_section *ms;
169
170 sparse_index_init(section, nid);
Andy Whitcroft85770ff2007-08-22 14:01:03 -0700171 set_section_nid(section, nid);
Bob Picco802f1922005-09-03 15:54:26 -0700172
173 ms = __nr_to_section(section);
174 if (!ms->section_mem_map)
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700175 ms->section_mem_map = sparse_encode_early_nid(nid) |
176 SECTION_MARKED_PRESENT;
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700177 }
178}
179
180/*
181 * Only used by the i386 NUMA architecures, but relatively
182 * generic code.
183 */
184unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn,
185 unsigned long end_pfn)
186{
187 unsigned long pfn;
188 unsigned long nr_pages = 0;
189
190 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
191 if (nid != early_pfn_to_nid(pfn))
192 continue;
193
Andy Whitcroft540557b2007-10-16 01:24:11 -0700194 if (pfn_present(pfn))
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700195 nr_pages += PAGES_PER_SECTION;
196 }
197
198 return nr_pages * sizeof(struct page);
199}
200
201/*
Andy Whitcroft29751f62005-06-23 00:08:00 -0700202 * Subtle, we encode the real pfn into the mem_map such that
203 * the identity pfn - section_mem_map will return the actual
204 * physical page frame number.
205 */
206static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
207{
208 return (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
209}
210
211/*
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700212 * Decode mem_map from the coded memmap
Andy Whitcroft29751f62005-06-23 00:08:00 -0700213 */
Andy Whitcroft29751f62005-06-23 00:08:00 -0700214struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
215{
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700216 /* mask off the extra low bits of information */
217 coded_mem_map &= SECTION_MAP_MASK;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700218 return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
219}
220
Yasunori Gotoa3142c82007-05-08 00:23:07 -0700221static int __meminit sparse_init_one_section(struct mem_section *ms,
Mel Gorman5c0e3062007-10-16 01:25:56 -0700222 unsigned long pnum, struct page *mem_map,
223 unsigned long *pageblock_bitmap)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700224{
Andy Whitcroft540557b2007-10-16 01:24:11 -0700225 if (!present_section(ms))
Andy Whitcroft29751f62005-06-23 00:08:00 -0700226 return -EINVAL;
227
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700228 ms->section_mem_map &= ~SECTION_MAP_MASK;
Andy Whitcroft540557b2007-10-16 01:24:11 -0700229 ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
230 SECTION_HAS_MEM_MAP;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700231 ms->pageblock_flags = pageblock_bitmap;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700232
233 return 1;
234}
235
Yasunori Goto04753272008-04-28 02:13:31 -0700236unsigned long usemap_size(void)
Mel Gorman5c0e3062007-10-16 01:25:56 -0700237{
238 unsigned long size_bytes;
239 size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
240 size_bytes = roundup(size_bytes, sizeof(unsigned long));
241 return size_bytes;
242}
243
244#ifdef CONFIG_MEMORY_HOTPLUG
245static unsigned long *__kmalloc_section_usemap(void)
246{
247 return kmalloc(usemap_size(), GFP_KERNEL);
248}
249#endif /* CONFIG_MEMORY_HOTPLUG */
250
Sam Ravnborga322f8a2008-02-04 22:29:35 -0800251static unsigned long *__init sparse_early_usemap_alloc(unsigned long pnum)
Mel Gorman5c0e3062007-10-16 01:25:56 -0700252{
Andrew Morton51674642008-04-30 00:55:17 -0700253 unsigned long *usemap;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700254 struct mem_section *ms = __nr_to_section(pnum);
255 int nid = sparse_early_nid(ms);
256
Andrew Morton51674642008-04-30 00:55:17 -0700257 usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size());
Mel Gorman5c0e3062007-10-16 01:25:56 -0700258 if (usemap)
259 return usemap;
260
261 /* Stupid: suppress gcc warning for SPARSEMEM && !NUMA */
262 nid = 0;
263
Harvey Harrisond40cee22008-04-30 00:55:07 -0700264 printk(KERN_WARNING "%s: allocation failed\n", __func__);
Mel Gorman5c0e3062007-10-16 01:25:56 -0700265 return NULL;
266}
267
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700268#ifndef CONFIG_SPARSEMEM_VMEMMAP
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700269struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700270{
271 struct page *map;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700272
273 map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
274 if (map)
275 return map;
276
Yasunori Goto9d992172008-04-28 02:13:32 -0700277 map = alloc_bootmem_pages_node(NODE_DATA(nid),
278 PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION));
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700279 return map;
280}
281#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
282
283struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
284{
285 struct page *map;
286 struct mem_section *ms = __nr_to_section(pnum);
287 int nid = sparse_early_nid(ms);
288
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700289 map = sparse_mem_map_populate(pnum, nid);
Andy Whitcroft29751f62005-06-23 00:08:00 -0700290 if (map)
291 return map;
292
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700293 printk(KERN_ERR "%s: sparsemem memory map backing failed "
Harvey Harrisond40cee22008-04-30 00:55:07 -0700294 "some memory will not be available.\n", __func__);
Bob Picco802f1922005-09-03 15:54:26 -0700295 ms->section_mem_map = 0;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700296 return NULL;
297}
298
Yinghai Luc2b91e22008-04-12 01:19:24 -0700299void __attribute__((weak)) __meminit vmemmap_populate_print_last(void)
300{
301}
Stephen Rothwell193faea2007-06-08 13:46:51 -0700302/*
303 * Allocate the accumulated non-linear sections, allocate a mem_map
304 * for each and record the physical to section mapping.
305 */
306void __init sparse_init(void)
307{
308 unsigned long pnum;
309 struct page *map;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700310 unsigned long *usemap;
Yinghai Lue123dd32008-04-13 11:51:06 -0700311 unsigned long **usemap_map;
312 int size;
313
314 /*
315 * map is using big page (aka 2M in x86 64 bit)
316 * usemap is less one page (aka 24 bytes)
317 * so alloc 2M (with 2M align) and 24 bytes in turn will
318 * make next 2M slip to one more 2M later.
319 * then in big system, the memory will have a lot of holes...
320 * here try to allocate 2M pages continously.
321 *
322 * powerpc need to call sparse_init_one_section right after each
323 * sparse_early_mem_map_alloc, so allocate usemap_map at first.
324 */
325 size = sizeof(unsigned long *) * NR_MEM_SECTIONS;
326 usemap_map = alloc_bootmem(size);
327 if (!usemap_map)
328 panic("can not allocate usemap_map\n");
Stephen Rothwell193faea2007-06-08 13:46:51 -0700329
330 for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
Andy Whitcroft540557b2007-10-16 01:24:11 -0700331 if (!present_section_nr(pnum))
Stephen Rothwell193faea2007-06-08 13:46:51 -0700332 continue;
Yinghai Lue123dd32008-04-13 11:51:06 -0700333 usemap_map[pnum] = sparse_early_usemap_alloc(pnum);
334 }
335
336 for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
337 if (!present_section_nr(pnum))
338 continue;
339
340 usemap = usemap_map[pnum];
341 if (!usemap)
342 continue;
Stephen Rothwell193faea2007-06-08 13:46:51 -0700343
344 map = sparse_early_mem_map_alloc(pnum);
345 if (!map)
346 continue;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700347
Mel Gorman5c0e3062007-10-16 01:25:56 -0700348 sparse_init_one_section(__nr_to_section(pnum), pnum, map,
349 usemap);
Stephen Rothwell193faea2007-06-08 13:46:51 -0700350 }
Yinghai Lue123dd32008-04-13 11:51:06 -0700351
Yinghai Luc2b91e22008-04-12 01:19:24 -0700352 vmemmap_populate_print_last();
353
Yinghai Lue123dd32008-04-13 11:51:06 -0700354 free_bootmem(__pa(usemap_map), size);
Stephen Rothwell193faea2007-06-08 13:46:51 -0700355}
356
357#ifdef CONFIG_MEMORY_HOTPLUG
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700358#ifdef CONFIG_SPARSEMEM_VMEMMAP
359static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
360 unsigned long nr_pages)
361{
362 /* This will make the necessary allocations eventually. */
363 return sparse_mem_map_populate(pnum, nid);
364}
365static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
366{
367 return; /* XXX: Not implemented yet */
368}
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700369static void free_map_bootmem(struct page *page, unsigned long nr_pages)
370{
371}
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700372#else
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700373static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
374{
375 struct page *page, *ret;
376 unsigned long memmap_size = sizeof(struct page) * nr_pages;
377
Yasunori Gotof2d0aa52006-10-28 10:38:32 -0700378 page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700379 if (page)
380 goto got_map_page;
381
382 ret = vmalloc(memmap_size);
383 if (ret)
384 goto got_map_ptr;
385
386 return NULL;
387got_map_page:
388 ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
389got_map_ptr:
390 memset(ret, 0, memmap_size);
391
392 return ret;
393}
394
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700395static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
396 unsigned long nr_pages)
397{
398 return __kmalloc_section_memmap(nr_pages);
399}
400
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700401static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
402{
Christoph Lameter9e2779f2008-02-04 22:28:34 -0800403 if (is_vmalloc_addr(memmap))
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700404 vfree(memmap);
405 else
406 free_pages((unsigned long)memmap,
407 get_order(sizeof(struct page) * nr_pages));
408}
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700409
410static void free_map_bootmem(struct page *page, unsigned long nr_pages)
411{
412 unsigned long maps_section_nr, removing_section_nr, i;
413 int magic;
414
415 for (i = 0; i < nr_pages; i++, page++) {
416 magic = atomic_read(&page->_mapcount);
417
418 BUG_ON(magic == NODE_INFO);
419
420 maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
421 removing_section_nr = page->private;
422
423 /*
424 * When this function is called, the removing section is
425 * logical offlined state. This means all pages are isolated
426 * from page allocator. If removing section's memmap is placed
427 * on the same section, it must not be freed.
428 * If it is freed, page allocator may allocate it which will
429 * be removed physically soon.
430 */
431 if (maps_section_nr != removing_section_nr)
432 put_page_bootmem(page);
433 }
434}
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700435#endif /* CONFIG_SPARSEMEM_VMEMMAP */
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700436
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700437static void free_section_usemap(struct page *memmap, unsigned long *usemap)
438{
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700439 struct page *usemap_page;
440 unsigned long nr_pages;
441
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700442 if (!usemap)
443 return;
444
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700445 usemap_page = virt_to_page(usemap);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700446 /*
447 * Check to see if allocation came from hot-plug-add
448 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700449 if (PageSlab(usemap_page)) {
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700450 kfree(usemap);
451 if (memmap)
452 __kfree_section_memmap(memmap, PAGES_PER_SECTION);
453 return;
454 }
455
456 /*
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700457 * The usemap came from bootmem. This is packed with other usemaps
458 * on the section which has pgdat at boot time. Just keep it as is now.
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700459 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700460
461 if (memmap) {
462 struct page *memmap_page;
463 memmap_page = virt_to_page(memmap);
464
465 nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
466 >> PAGE_SHIFT;
467
468 free_map_bootmem(memmap_page, nr_pages);
469 }
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700470}
471
Andy Whitcroft29751f62005-06-23 00:08:00 -0700472/*
Andy Whitcroft29751f62005-06-23 00:08:00 -0700473 * returns the number of sections whose mem_maps were properly
474 * set. If this is <=0, then that means that the passed-in
475 * map was not consumed and must be freed.
476 */
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700477int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
478 int nr_pages)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700479{
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700480 unsigned long section_nr = pfn_to_section_nr(start_pfn);
481 struct pglist_data *pgdat = zone->zone_pgdat;
482 struct mem_section *ms;
483 struct page *memmap;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700484 unsigned long *usemap;
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700485 unsigned long flags;
486 int ret;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700487
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700488 /*
489 * no locking for this, because it does its own
490 * plus, it does a kmalloc
491 */
WANG Congbbd06822007-12-17 16:19:59 -0800492 ret = sparse_index_init(section_nr, pgdat->node_id);
493 if (ret < 0 && ret != -EEXIST)
494 return ret;
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700495 memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages);
WANG Congbbd06822007-12-17 16:19:59 -0800496 if (!memmap)
497 return -ENOMEM;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700498 usemap = __kmalloc_section_usemap();
WANG Congbbd06822007-12-17 16:19:59 -0800499 if (!usemap) {
500 __kfree_section_memmap(memmap, nr_pages);
501 return -ENOMEM;
502 }
Andy Whitcroft29751f62005-06-23 00:08:00 -0700503
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700504 pgdat_resize_lock(pgdat, &flags);
505
506 ms = __pfn_to_section(start_pfn);
507 if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
508 ret = -EEXIST;
509 goto out;
510 }
Mel Gorman5c0e3062007-10-16 01:25:56 -0700511
Andy Whitcroft29751f62005-06-23 00:08:00 -0700512 ms->section_mem_map |= SECTION_MARKED_PRESENT;
513
Mel Gorman5c0e3062007-10-16 01:25:56 -0700514 ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700515
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700516out:
517 pgdat_resize_unlock(pgdat, &flags);
WANG Congbbd06822007-12-17 16:19:59 -0800518 if (ret <= 0) {
519 kfree(usemap);
Mike Kravetz46a66ee2006-05-01 12:16:09 -0700520 __kfree_section_memmap(memmap, nr_pages);
WANG Congbbd06822007-12-17 16:19:59 -0800521 }
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700522 return ret;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700523}
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700524
525void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
526{
527 struct page *memmap = NULL;
528 unsigned long *usemap = NULL;
529
530 if (ms->section_mem_map) {
531 usemap = ms->pageblock_flags;
532 memmap = sparse_decode_mem_map(ms->section_mem_map,
533 __section_nr(ms));
534 ms->section_mem_map = 0;
535 ms->pageblock_flags = NULL;
536 }
537
538 free_section_usemap(memmap, usemap);
539}
Yasunori Gotoa3142c82007-05-08 00:23:07 -0700540#endif