blob: aa64b12831a24b8c831878b1ea8b66c2553a619e [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09005#include <linux/slab.h>
Andy Whitcroftd41dee32005-06-23 00:07:54 -07006#include <linux/mmzone.h>
7#include <linux/bootmem.h>
Dave Hansen0b0acbe2005-10-29 18:16:55 -07008#include <linux/highmem.h>
Andy Whitcroftd41dee32005-06-23 00:07:54 -07009#include <linux/module.h>
Dave Hansen28ae55c2005-09-03 15:54:29 -070010#include <linux/spinlock.h>
Dave Hansen0b0acbe2005-10-29 18:16:55 -070011#include <linux/vmalloc.h>
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070012#include "internal.h"
Andy Whitcroftd41dee32005-06-23 00:07:54 -070013#include <asm/dma.h>
Christoph Lameter8f6aac42007-10-16 01:24:13 -070014#include <asm/pgalloc.h>
15#include <asm/pgtable.h>
Andy Whitcroftd41dee32005-06-23 00:07:54 -070016
17/*
18 * Permanent SPARSEMEM data:
19 *
20 * 1) mem_section - memory sections, mem_map's for valid memory
21 */
Bob Picco3e347262005-09-03 15:54:28 -070022#ifdef CONFIG_SPARSEMEM_EXTREME
Bob Picco802f1922005-09-03 15:54:26 -070023struct mem_section *mem_section[NR_SECTION_ROOTS]
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080024 ____cacheline_internodealigned_in_smp;
Bob Picco3e347262005-09-03 15:54:28 -070025#else
26struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080027 ____cacheline_internodealigned_in_smp;
Bob Picco3e347262005-09-03 15:54:28 -070028#endif
29EXPORT_SYMBOL(mem_section);
30
Christoph Lameter89689ae2006-12-06 20:31:45 -080031#ifdef NODE_NOT_IN_PAGE_FLAGS
32/*
33 * If we did not store the node number in the page then we have to
34 * do a lookup in the section_to_node_table in order to find which
35 * node the page belongs to.
36 */
37#if MAX_NUMNODES <= 256
38static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
39#else
40static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
41#endif
42
Andy Whitcroft25ba77c2006-12-06 20:33:03 -080043int page_to_nid(struct page *page)
Christoph Lameter89689ae2006-12-06 20:31:45 -080044{
45 return section_to_node_table[page_to_section(page)];
46}
47EXPORT_SYMBOL(page_to_nid);
Andy Whitcroft85770ff2007-08-22 14:01:03 -070048
49static void set_section_nid(unsigned long section_nr, int nid)
50{
51 section_to_node_table[section_nr] = nid;
52}
53#else /* !NODE_NOT_IN_PAGE_FLAGS */
54static inline void set_section_nid(unsigned long section_nr, int nid)
55{
56}
Christoph Lameter89689ae2006-12-06 20:31:45 -080057#endif
58
Bob Picco3e347262005-09-03 15:54:28 -070059#ifdef CONFIG_SPARSEMEM_EXTREME
Sam Ravnborg577a32f2007-05-17 23:29:25 +020060static struct mem_section noinline __init_refok *sparse_index_alloc(int nid)
Bob Picco802f1922005-09-03 15:54:26 -070061{
Dave Hansen28ae55c2005-09-03 15:54:29 -070062 struct mem_section *section = NULL;
63 unsigned long array_size = SECTIONS_PER_ROOT *
64 sizeof(struct mem_section);
Bob Picco802f1922005-09-03 15:54:26 -070065
Shaohua Lif52407c2009-09-21 17:01:19 -070066 if (slab_is_available()) {
67 if (node_state(nid, N_HIGH_MEMORY))
68 section = kmalloc_node(array_size, GFP_KERNEL, nid);
69 else
70 section = kmalloc(array_size, GFP_KERNEL);
71 } else
Mike Kravetz46a66ee2006-05-01 12:16:09 -070072 section = alloc_bootmem_node(NODE_DATA(nid), array_size);
Bob Picco3e347262005-09-03 15:54:28 -070073
Dave Hansen28ae55c2005-09-03 15:54:29 -070074 if (section)
75 memset(section, 0, array_size);
Bob Picco3e347262005-09-03 15:54:28 -070076
Dave Hansen28ae55c2005-09-03 15:54:29 -070077 return section;
Bob Picco802f1922005-09-03 15:54:26 -070078}
Dave Hansen28ae55c2005-09-03 15:54:29 -070079
Yasunori Gotoa3142c82007-05-08 00:23:07 -070080static int __meminit sparse_index_init(unsigned long section_nr, int nid)
Dave Hansen28ae55c2005-09-03 15:54:29 -070081{
Ingo Molnar34af9462006-06-27 02:53:55 -070082 static DEFINE_SPINLOCK(index_init_lock);
Dave Hansen28ae55c2005-09-03 15:54:29 -070083 unsigned long root = SECTION_NR_TO_ROOT(section_nr);
84 struct mem_section *section;
85 int ret = 0;
86
87 if (mem_section[root])
88 return -EEXIST;
89
90 section = sparse_index_alloc(nid);
WANG Congaf0cd5a2007-12-17 16:19:58 -080091 if (!section)
92 return -ENOMEM;
Dave Hansen28ae55c2005-09-03 15:54:29 -070093 /*
94 * This lock keeps two different sections from
95 * reallocating for the same index
96 */
97 spin_lock(&index_init_lock);
98
99 if (mem_section[root]) {
100 ret = -EEXIST;
101 goto out;
102 }
103
104 mem_section[root] = section;
105out:
106 spin_unlock(&index_init_lock);
107 return ret;
108}
109#else /* !SPARSEMEM_EXTREME */
110static inline int sparse_index_init(unsigned long section_nr, int nid)
111{
112 return 0;
113}
114#endif
115
Dave Hansen4ca644d2005-10-29 18:16:51 -0700116/*
117 * Although written for the SPARSEMEM_EXTREME case, this happens
Andy Whitcroftcd881a62007-10-16 01:24:10 -0700118 * to also work for the flat array case because
Dave Hansen4ca644d2005-10-29 18:16:51 -0700119 * NR_SECTION_ROOTS==NR_MEM_SECTIONS.
120 */
121int __section_nr(struct mem_section* ms)
122{
123 unsigned long root_nr;
124 struct mem_section* root;
125
Mike Kravetz12783b02006-05-20 15:00:05 -0700126 for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) {
127 root = __nr_to_section(root_nr * SECTIONS_PER_ROOT);
Dave Hansen4ca644d2005-10-29 18:16:51 -0700128 if (!root)
129 continue;
130
131 if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT)))
132 break;
133 }
134
135 return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
136}
137
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700138/*
139 * During early boot, before section_mem_map is used for an actual
140 * mem_map, we use section_mem_map to store the section's NUMA
141 * node. This keeps us from having to use another data structure. The
142 * node information is cleared just before we store the real mem_map.
143 */
144static inline unsigned long sparse_encode_early_nid(int nid)
145{
146 return (nid << SECTION_NID_SHIFT);
147}
148
149static inline int sparse_early_nid(struct mem_section *section)
150{
151 return (section->section_mem_map >> SECTION_NID_SHIFT);
152}
153
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700154/* Validate the physical addressing limitations of the model */
155void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
156 unsigned long *end_pfn)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700157{
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700158 unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700159
Ingo Molnarbead9a32008-04-16 01:40:00 +0200160 /*
161 * Sanity checks - do not allow an architecture to pass
162 * in larger pfns than the maximum scope of sparsemem:
163 */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700164 if (*start_pfn > max_sparsemem_pfn) {
165 mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
166 "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
167 *start_pfn, *end_pfn, max_sparsemem_pfn);
168 WARN_ON_ONCE(1);
169 *start_pfn = max_sparsemem_pfn;
170 *end_pfn = max_sparsemem_pfn;
Cyrill Gorcunovef161a92009-03-31 15:19:25 -0700171 } else if (*end_pfn > max_sparsemem_pfn) {
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700172 mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
173 "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
174 *start_pfn, *end_pfn, max_sparsemem_pfn);
175 WARN_ON_ONCE(1);
176 *end_pfn = max_sparsemem_pfn;
177 }
178}
179
180/* Record a memory area against a node. */
181void __init memory_present(int nid, unsigned long start, unsigned long end)
182{
183 unsigned long pfn;
Ingo Molnarbead9a32008-04-16 01:40:00 +0200184
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700185 start &= PAGE_SECTION_MASK;
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700186 mminit_validate_memmodel_limits(&start, &end);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700187 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
188 unsigned long section = pfn_to_section_nr(pfn);
Bob Picco802f1922005-09-03 15:54:26 -0700189 struct mem_section *ms;
190
191 sparse_index_init(section, nid);
Andy Whitcroft85770ff2007-08-22 14:01:03 -0700192 set_section_nid(section, nid);
Bob Picco802f1922005-09-03 15:54:26 -0700193
194 ms = __nr_to_section(section);
195 if (!ms->section_mem_map)
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700196 ms->section_mem_map = sparse_encode_early_nid(nid) |
197 SECTION_MARKED_PRESENT;
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700198 }
199}
200
201/*
202 * Only used by the i386 NUMA architecures, but relatively
203 * generic code.
204 */
205unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn,
206 unsigned long end_pfn)
207{
208 unsigned long pfn;
209 unsigned long nr_pages = 0;
210
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700211 mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700212 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
213 if (nid != early_pfn_to_nid(pfn))
214 continue;
215
Andy Whitcroft540557b2007-10-16 01:24:11 -0700216 if (pfn_present(pfn))
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700217 nr_pages += PAGES_PER_SECTION;
218 }
219
220 return nr_pages * sizeof(struct page);
221}
222
223/*
Andy Whitcroft29751f62005-06-23 00:08:00 -0700224 * Subtle, we encode the real pfn into the mem_map such that
225 * the identity pfn - section_mem_map will return the actual
226 * physical page frame number.
227 */
228static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
229{
230 return (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
231}
232
233/*
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700234 * Decode mem_map from the coded memmap
Andy Whitcroft29751f62005-06-23 00:08:00 -0700235 */
Andy Whitcroft29751f62005-06-23 00:08:00 -0700236struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
237{
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700238 /* mask off the extra low bits of information */
239 coded_mem_map &= SECTION_MAP_MASK;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700240 return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
241}
242
Yasunori Gotoa3142c82007-05-08 00:23:07 -0700243static int __meminit sparse_init_one_section(struct mem_section *ms,
Mel Gorman5c0e3062007-10-16 01:25:56 -0700244 unsigned long pnum, struct page *mem_map,
245 unsigned long *pageblock_bitmap)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700246{
Andy Whitcroft540557b2007-10-16 01:24:11 -0700247 if (!present_section(ms))
Andy Whitcroft29751f62005-06-23 00:08:00 -0700248 return -EINVAL;
249
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700250 ms->section_mem_map &= ~SECTION_MAP_MASK;
Andy Whitcroft540557b2007-10-16 01:24:11 -0700251 ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
252 SECTION_HAS_MEM_MAP;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700253 ms->pageblock_flags = pageblock_bitmap;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700254
255 return 1;
256}
257
Yasunori Goto04753272008-04-28 02:13:31 -0700258unsigned long usemap_size(void)
Mel Gorman5c0e3062007-10-16 01:25:56 -0700259{
260 unsigned long size_bytes;
261 size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
262 size_bytes = roundup(size_bytes, sizeof(unsigned long));
263 return size_bytes;
264}
265
266#ifdef CONFIG_MEMORY_HOTPLUG
267static unsigned long *__kmalloc_section_usemap(void)
268{
269 return kmalloc(usemap_size(), GFP_KERNEL);
270}
271#endif /* CONFIG_MEMORY_HOTPLUG */
272
Yasunori Goto48c90682008-07-23 21:28:15 -0700273#ifdef CONFIG_MEMORY_HOTREMOVE
274static unsigned long * __init
Yinghai Lua4322e12010-02-10 01:20:21 -0800275sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
276 unsigned long count)
Yasunori Goto48c90682008-07-23 21:28:15 -0700277{
278 unsigned long section_nr;
279
280 /*
281 * A page may contain usemaps for other sections preventing the
282 * page being freed and making a section unremovable while
283 * other sections referencing the usemap retmain active. Similarly,
284 * a pgdat can prevent a section being removed. If section A
285 * contains a pgdat and section B contains the usemap, both
286 * sections become inter-dependent. This allocates usemaps
287 * from the same section as the pgdat where possible to avoid
288 * this problem.
289 */
290 section_nr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
Yinghai Lua4322e12010-02-10 01:20:21 -0800291 return alloc_bootmem_section(usemap_size() * count, section_nr);
Yasunori Goto48c90682008-07-23 21:28:15 -0700292}
293
294static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
295{
296 unsigned long usemap_snr, pgdat_snr;
297 static unsigned long old_usemap_snr = NR_MEM_SECTIONS;
298 static unsigned long old_pgdat_snr = NR_MEM_SECTIONS;
299 struct pglist_data *pgdat = NODE_DATA(nid);
300 int usemap_nid;
301
302 usemap_snr = pfn_to_section_nr(__pa(usemap) >> PAGE_SHIFT);
303 pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
304 if (usemap_snr == pgdat_snr)
305 return;
306
307 if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr)
308 /* skip redundant message */
309 return;
310
311 old_usemap_snr = usemap_snr;
312 old_pgdat_snr = pgdat_snr;
313
314 usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr));
315 if (usemap_nid != nid) {
316 printk(KERN_INFO
317 "node %d must be removed before remove section %ld\n",
318 nid, usemap_snr);
319 return;
320 }
321 /*
322 * There is a circular dependency.
323 * Some platforms allow un-removable section because they will just
324 * gather other removable sections for dynamic partitioning.
325 * Just notify un-removable section's number here.
326 */
327 printk(KERN_INFO "Section %ld and %ld (node %d)", usemap_snr,
328 pgdat_snr, nid);
329 printk(KERN_CONT
330 " have a circular dependency on usemap and pgdat allocations\n");
331}
332#else
333static unsigned long * __init
Yinghai Lua4322e12010-02-10 01:20:21 -0800334sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
335 unsigned long count)
Yasunori Goto48c90682008-07-23 21:28:15 -0700336{
337 return NULL;
338}
339
340static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
341{
342}
343#endif /* CONFIG_MEMORY_HOTREMOVE */
344
Yinghai Lua4322e12010-02-10 01:20:21 -0800345static void __init sparse_early_usemaps_alloc_node(unsigned long**usemap_map,
346 unsigned long pnum_begin,
347 unsigned long pnum_end,
348 unsigned long usemap_count, int nodeid)
Mel Gorman5c0e3062007-10-16 01:25:56 -0700349{
Yinghai Lua4322e12010-02-10 01:20:21 -0800350 void *usemap;
351 unsigned long pnum;
352 int size = usemap_size();
Mel Gorman5c0e3062007-10-16 01:25:56 -0700353
Yinghai Lua4322e12010-02-10 01:20:21 -0800354 usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid),
355 usemap_count);
Yasunori Goto48c90682008-07-23 21:28:15 -0700356 if (usemap) {
Yinghai Lua4322e12010-02-10 01:20:21 -0800357 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
358 if (!present_section_nr(pnum))
359 continue;
360 usemap_map[pnum] = usemap;
361 usemap += size;
362 }
363 return;
Yasunori Goto48c90682008-07-23 21:28:15 -0700364 }
365
Yinghai Lua4322e12010-02-10 01:20:21 -0800366 usemap = alloc_bootmem_node(NODE_DATA(nodeid), size * usemap_count);
367 if (usemap) {
368 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
369 if (!present_section_nr(pnum))
370 continue;
371 usemap_map[pnum] = usemap;
372 usemap += size;
373 check_usemap_section_nr(nodeid, usemap_map[pnum]);
374 }
375 return;
376 }
Mel Gorman5c0e3062007-10-16 01:25:56 -0700377
Harvey Harrisond40cee22008-04-30 00:55:07 -0700378 printk(KERN_WARNING "%s: allocation failed\n", __func__);
Mel Gorman5c0e3062007-10-16 01:25:56 -0700379}
380
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700381#ifndef CONFIG_SPARSEMEM_VMEMMAP
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700382struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700383{
384 struct page *map;
Yinghai Lue48e67e2010-05-24 14:31:57 -0700385 unsigned long size;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700386
387 map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
388 if (map)
389 return map;
390
Yinghai Lue48e67e2010-05-24 14:31:57 -0700391 size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
392 map = __alloc_bootmem_node_high(NODE_DATA(nid), size,
393 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700394 return map;
395}
Yinghai Lu9bdac912010-02-10 01:20:22 -0800396void __init sparse_mem_maps_populate_node(struct page **map_map,
397 unsigned long pnum_begin,
398 unsigned long pnum_end,
399 unsigned long map_count, int nodeid)
400{
401 void *map;
402 unsigned long pnum;
403 unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
404
405 map = alloc_remap(nodeid, size * map_count);
406 if (map) {
407 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
408 if (!present_section_nr(pnum))
409 continue;
410 map_map[pnum] = map;
411 map += size;
412 }
413 return;
414 }
415
416 size = PAGE_ALIGN(size);
Yinghai Lue48e67e2010-05-24 14:31:57 -0700417 map = __alloc_bootmem_node_high(NODE_DATA(nodeid), size * map_count,
418 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
Yinghai Lu9bdac912010-02-10 01:20:22 -0800419 if (map) {
420 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
421 if (!present_section_nr(pnum))
422 continue;
423 map_map[pnum] = map;
424 map += size;
425 }
426 return;
427 }
428
429 /* fallback */
430 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
431 struct mem_section *ms;
432
433 if (!present_section_nr(pnum))
434 continue;
435 map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
436 if (map_map[pnum])
437 continue;
438 ms = __nr_to_section(pnum);
439 printk(KERN_ERR "%s: sparsemem memory map backing failed "
440 "some memory will not be available.\n", __func__);
441 ms->section_mem_map = 0;
442 }
443}
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700444#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
445
Yinghai Lu81d0d952010-02-27 09:29:38 -0800446#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
Yinghai Lu9bdac912010-02-10 01:20:22 -0800447static void __init sparse_early_mem_maps_alloc_node(struct page **map_map,
448 unsigned long pnum_begin,
449 unsigned long pnum_end,
450 unsigned long map_count, int nodeid)
451{
452 sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
453 map_count, nodeid);
454}
Yinghai Lu81d0d952010-02-27 09:29:38 -0800455#else
Adrian Bunk9e5c6da2008-07-25 19:46:22 -0700456static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700457{
458 struct page *map;
459 struct mem_section *ms = __nr_to_section(pnum);
460 int nid = sparse_early_nid(ms);
461
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700462 map = sparse_mem_map_populate(pnum, nid);
Andy Whitcroft29751f62005-06-23 00:08:00 -0700463 if (map)
464 return map;
465
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700466 printk(KERN_ERR "%s: sparsemem memory map backing failed "
Harvey Harrisond40cee22008-04-30 00:55:07 -0700467 "some memory will not be available.\n", __func__);
Bob Picco802f1922005-09-03 15:54:26 -0700468 ms->section_mem_map = 0;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700469 return NULL;
470}
Yinghai Lu9bdac912010-02-10 01:20:22 -0800471#endif
Andy Whitcroft29751f62005-06-23 00:08:00 -0700472
Yinghai Luc2b91e22008-04-12 01:19:24 -0700473void __attribute__((weak)) __meminit vmemmap_populate_print_last(void)
474{
475}
Yinghai Lua4322e12010-02-10 01:20:21 -0800476
Stephen Rothwell193faea2007-06-08 13:46:51 -0700477/*
478 * Allocate the accumulated non-linear sections, allocate a mem_map
479 * for each and record the physical to section mapping.
480 */
481void __init sparse_init(void)
482{
483 unsigned long pnum;
484 struct page *map;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700485 unsigned long *usemap;
Yinghai Lue123dd32008-04-13 11:51:06 -0700486 unsigned long **usemap_map;
Yinghai Lu81d0d952010-02-27 09:29:38 -0800487 int size;
Yinghai Lua4322e12010-02-10 01:20:21 -0800488 int nodeid_begin = 0;
489 unsigned long pnum_begin = 0;
490 unsigned long usemap_count;
Yinghai Lu81d0d952010-02-27 09:29:38 -0800491#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
Yinghai Lu9bdac912010-02-10 01:20:22 -0800492 unsigned long map_count;
Yinghai Lu81d0d952010-02-27 09:29:38 -0800493 int size2;
494 struct page **map_map;
495#endif
Yinghai Lue123dd32008-04-13 11:51:06 -0700496
497 /*
498 * map is using big page (aka 2M in x86 64 bit)
499 * usemap is less one page (aka 24 bytes)
500 * so alloc 2M (with 2M align) and 24 bytes in turn will
501 * make next 2M slip to one more 2M later.
502 * then in big system, the memory will have a lot of holes...
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300503 * here try to allocate 2M pages continuously.
Yinghai Lue123dd32008-04-13 11:51:06 -0700504 *
505 * powerpc need to call sparse_init_one_section right after each
506 * sparse_early_mem_map_alloc, so allocate usemap_map at first.
507 */
508 size = sizeof(unsigned long *) * NR_MEM_SECTIONS;
509 usemap_map = alloc_bootmem(size);
510 if (!usemap_map)
511 panic("can not allocate usemap_map\n");
Stephen Rothwell193faea2007-06-08 13:46:51 -0700512
513 for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
Yinghai Lua4322e12010-02-10 01:20:21 -0800514 struct mem_section *ms;
515
Andy Whitcroft540557b2007-10-16 01:24:11 -0700516 if (!present_section_nr(pnum))
Stephen Rothwell193faea2007-06-08 13:46:51 -0700517 continue;
Yinghai Lua4322e12010-02-10 01:20:21 -0800518 ms = __nr_to_section(pnum);
519 nodeid_begin = sparse_early_nid(ms);
520 pnum_begin = pnum;
521 break;
Yinghai Lue123dd32008-04-13 11:51:06 -0700522 }
Yinghai Lua4322e12010-02-10 01:20:21 -0800523 usemap_count = 1;
524 for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) {
525 struct mem_section *ms;
526 int nodeid;
527
528 if (!present_section_nr(pnum))
529 continue;
530 ms = __nr_to_section(pnum);
531 nodeid = sparse_early_nid(ms);
532 if (nodeid == nodeid_begin) {
533 usemap_count++;
534 continue;
535 }
536 /* ok, we need to take cake of from pnum_begin to pnum - 1*/
537 sparse_early_usemaps_alloc_node(usemap_map, pnum_begin, pnum,
538 usemap_count, nodeid_begin);
539 /* new start, update count etc*/
540 nodeid_begin = nodeid;
541 pnum_begin = pnum;
542 usemap_count = 1;
543 }
544 /* ok, last chunk */
545 sparse_early_usemaps_alloc_node(usemap_map, pnum_begin, NR_MEM_SECTIONS,
546 usemap_count, nodeid_begin);
Yinghai Lue123dd32008-04-13 11:51:06 -0700547
Yinghai Lu9bdac912010-02-10 01:20:22 -0800548#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
549 size2 = sizeof(struct page *) * NR_MEM_SECTIONS;
550 map_map = alloc_bootmem(size2);
551 if (!map_map)
552 panic("can not allocate map_map\n");
553
554 for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
555 struct mem_section *ms;
556
557 if (!present_section_nr(pnum))
558 continue;
559 ms = __nr_to_section(pnum);
560 nodeid_begin = sparse_early_nid(ms);
561 pnum_begin = pnum;
562 break;
563 }
564 map_count = 1;
565 for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) {
566 struct mem_section *ms;
567 int nodeid;
568
569 if (!present_section_nr(pnum))
570 continue;
571 ms = __nr_to_section(pnum);
572 nodeid = sparse_early_nid(ms);
573 if (nodeid == nodeid_begin) {
574 map_count++;
575 continue;
576 }
577 /* ok, we need to take cake of from pnum_begin to pnum - 1*/
578 sparse_early_mem_maps_alloc_node(map_map, pnum_begin, pnum,
579 map_count, nodeid_begin);
580 /* new start, update count etc*/
581 nodeid_begin = nodeid;
582 pnum_begin = pnum;
583 map_count = 1;
584 }
585 /* ok, last chunk */
586 sparse_early_mem_maps_alloc_node(map_map, pnum_begin, NR_MEM_SECTIONS,
587 map_count, nodeid_begin);
588#endif
589
Yinghai Lue123dd32008-04-13 11:51:06 -0700590 for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
591 if (!present_section_nr(pnum))
592 continue;
593
594 usemap = usemap_map[pnum];
595 if (!usemap)
596 continue;
Stephen Rothwell193faea2007-06-08 13:46:51 -0700597
Yinghai Lu9bdac912010-02-10 01:20:22 -0800598#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
599 map = map_map[pnum];
600#else
Stephen Rothwell193faea2007-06-08 13:46:51 -0700601 map = sparse_early_mem_map_alloc(pnum);
Yinghai Lu9bdac912010-02-10 01:20:22 -0800602#endif
Stephen Rothwell193faea2007-06-08 13:46:51 -0700603 if (!map)
604 continue;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700605
Mel Gorman5c0e3062007-10-16 01:25:56 -0700606 sparse_init_one_section(__nr_to_section(pnum), pnum, map,
607 usemap);
Stephen Rothwell193faea2007-06-08 13:46:51 -0700608 }
Yinghai Lue123dd32008-04-13 11:51:06 -0700609
Yinghai Luc2b91e22008-04-12 01:19:24 -0700610 vmemmap_populate_print_last();
611
Yinghai Lu9bdac912010-02-10 01:20:22 -0800612#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
613 free_bootmem(__pa(map_map), size2);
614#endif
Yinghai Lue123dd32008-04-13 11:51:06 -0700615 free_bootmem(__pa(usemap_map), size);
Stephen Rothwell193faea2007-06-08 13:46:51 -0700616}
617
618#ifdef CONFIG_MEMORY_HOTPLUG
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700619#ifdef CONFIG_SPARSEMEM_VMEMMAP
620static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
621 unsigned long nr_pages)
622{
623 /* This will make the necessary allocations eventually. */
624 return sparse_mem_map_populate(pnum, nid);
625}
626static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
627{
628 return; /* XXX: Not implemented yet */
629}
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700630static void free_map_bootmem(struct page *page, unsigned long nr_pages)
631{
632}
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700633#else
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700634static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
635{
636 struct page *page, *ret;
637 unsigned long memmap_size = sizeof(struct page) * nr_pages;
638
Yasunori Gotof2d0aa52006-10-28 10:38:32 -0700639 page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700640 if (page)
641 goto got_map_page;
642
643 ret = vmalloc(memmap_size);
644 if (ret)
645 goto got_map_ptr;
646
647 return NULL;
648got_map_page:
649 ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
650got_map_ptr:
651 memset(ret, 0, memmap_size);
652
653 return ret;
654}
655
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700656static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
657 unsigned long nr_pages)
658{
659 return __kmalloc_section_memmap(nr_pages);
660}
661
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700662static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
663{
Christoph Lameter9e2779f2008-02-04 22:28:34 -0800664 if (is_vmalloc_addr(memmap))
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700665 vfree(memmap);
666 else
667 free_pages((unsigned long)memmap,
668 get_order(sizeof(struct page) * nr_pages));
669}
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700670
671static void free_map_bootmem(struct page *page, unsigned long nr_pages)
672{
673 unsigned long maps_section_nr, removing_section_nr, i;
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800674 unsigned long magic;
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700675
676 for (i = 0; i < nr_pages; i++, page++) {
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800677 magic = (unsigned long) page->lru.next;
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700678
679 BUG_ON(magic == NODE_INFO);
680
681 maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
682 removing_section_nr = page->private;
683
684 /*
685 * When this function is called, the removing section is
686 * logical offlined state. This means all pages are isolated
687 * from page allocator. If removing section's memmap is placed
688 * on the same section, it must not be freed.
689 * If it is freed, page allocator may allocate it which will
690 * be removed physically soon.
691 */
692 if (maps_section_nr != removing_section_nr)
693 put_page_bootmem(page);
694 }
695}
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700696#endif /* CONFIG_SPARSEMEM_VMEMMAP */
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700697
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700698static void free_section_usemap(struct page *memmap, unsigned long *usemap)
699{
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700700 struct page *usemap_page;
701 unsigned long nr_pages;
702
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700703 if (!usemap)
704 return;
705
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700706 usemap_page = virt_to_page(usemap);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700707 /*
708 * Check to see if allocation came from hot-plug-add
709 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700710 if (PageSlab(usemap_page)) {
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700711 kfree(usemap);
712 if (memmap)
713 __kfree_section_memmap(memmap, PAGES_PER_SECTION);
714 return;
715 }
716
717 /*
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700718 * The usemap came from bootmem. This is packed with other usemaps
719 * on the section which has pgdat at boot time. Just keep it as is now.
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700720 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700721
722 if (memmap) {
723 struct page *memmap_page;
724 memmap_page = virt_to_page(memmap);
725
726 nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
727 >> PAGE_SHIFT;
728
729 free_map_bootmem(memmap_page, nr_pages);
730 }
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700731}
732
Andy Whitcroft29751f62005-06-23 00:08:00 -0700733/*
Andy Whitcroft29751f62005-06-23 00:08:00 -0700734 * returns the number of sections whose mem_maps were properly
735 * set. If this is <=0, then that means that the passed-in
736 * map was not consumed and must be freed.
737 */
Al Viro31168482008-11-22 17:33:24 +0000738int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700739 int nr_pages)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700740{
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700741 unsigned long section_nr = pfn_to_section_nr(start_pfn);
742 struct pglist_data *pgdat = zone->zone_pgdat;
743 struct mem_section *ms;
744 struct page *memmap;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700745 unsigned long *usemap;
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700746 unsigned long flags;
747 int ret;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700748
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700749 /*
750 * no locking for this, because it does its own
751 * plus, it does a kmalloc
752 */
WANG Congbbd06822007-12-17 16:19:59 -0800753 ret = sparse_index_init(section_nr, pgdat->node_id);
754 if (ret < 0 && ret != -EEXIST)
755 return ret;
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700756 memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages);
WANG Congbbd06822007-12-17 16:19:59 -0800757 if (!memmap)
758 return -ENOMEM;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700759 usemap = __kmalloc_section_usemap();
WANG Congbbd06822007-12-17 16:19:59 -0800760 if (!usemap) {
761 __kfree_section_memmap(memmap, nr_pages);
762 return -ENOMEM;
763 }
Andy Whitcroft29751f62005-06-23 00:08:00 -0700764
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700765 pgdat_resize_lock(pgdat, &flags);
766
767 ms = __pfn_to_section(start_pfn);
768 if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
769 ret = -EEXIST;
770 goto out;
771 }
Mel Gorman5c0e3062007-10-16 01:25:56 -0700772
Andy Whitcroft29751f62005-06-23 00:08:00 -0700773 ms->section_mem_map |= SECTION_MARKED_PRESENT;
774
Mel Gorman5c0e3062007-10-16 01:25:56 -0700775 ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700776
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700777out:
778 pgdat_resize_unlock(pgdat, &flags);
WANG Congbbd06822007-12-17 16:19:59 -0800779 if (ret <= 0) {
780 kfree(usemap);
Mike Kravetz46a66ee2006-05-01 12:16:09 -0700781 __kfree_section_memmap(memmap, nr_pages);
WANG Congbbd06822007-12-17 16:19:59 -0800782 }
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700783 return ret;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700784}
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700785
786void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
787{
788 struct page *memmap = NULL;
789 unsigned long *usemap = NULL;
790
791 if (ms->section_mem_map) {
792 usemap = ms->pageblock_flags;
793 memmap = sparse_decode_mem_map(ms->section_mem_map,
794 __section_nr(ms));
795 ms->section_mem_map = 0;
796 ms->pageblock_flags = NULL;
797 }
798
799 free_section_usemap(memmap, usemap);
800}
Yasunori Gotoa3142c82007-05-08 00:23:07 -0700801#endif