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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>
Gideon Israel Dsouza3b321232014-04-07 15:37:26 -07008#include <linux/compiler.h>
Dave Hansen0b0acbe2005-10-29 18:16:55 -07009#include <linux/highmem.h>
Paul Gortmakerb95f1b312011-10-16 02:01:52 -040010#include <linux/export.h>
Dave Hansen28ae55c2005-09-03 15:54:29 -070011#include <linux/spinlock.h>
Dave Hansen0b0acbe2005-10-29 18:16:55 -070012#include <linux/vmalloc.h>
Gideon Israel Dsouza3b321232014-04-07 15:37:26 -070013
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070014#include "internal.h"
Andy Whitcroftd41dee32005-06-23 00:07:54 -070015#include <asm/dma.h>
Christoph Lameter8f6aac42007-10-16 01:24:13 -070016#include <asm/pgalloc.h>
17#include <asm/pgtable.h>
Andy Whitcroftd41dee32005-06-23 00:07:54 -070018
19/*
20 * Permanent SPARSEMEM data:
21 *
22 * 1) mem_section - memory sections, mem_map's for valid memory
23 */
Bob Picco3e347262005-09-03 15:54:28 -070024#ifdef CONFIG_SPARSEMEM_EXTREME
Bob Picco802f1922005-09-03 15:54:26 -070025struct mem_section *mem_section[NR_SECTION_ROOTS]
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080026 ____cacheline_internodealigned_in_smp;
Bob Picco3e347262005-09-03 15:54:28 -070027#else
28struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
Ravikiran G Thirumalai22fc6ec2006-01-08 01:01:27 -080029 ____cacheline_internodealigned_in_smp;
Bob Picco3e347262005-09-03 15:54:28 -070030#endif
31EXPORT_SYMBOL(mem_section);
32
Christoph Lameter89689ae2006-12-06 20:31:45 -080033#ifdef NODE_NOT_IN_PAGE_FLAGS
34/*
35 * If we did not store the node number in the page then we have to
36 * do a lookup in the section_to_node_table in order to find which
37 * node the page belongs to.
38 */
39#if MAX_NUMNODES <= 256
40static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
41#else
42static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
43#endif
44
Ian Campbell33dd4e02011-07-25 17:11:51 -070045int page_to_nid(const struct page *page)
Christoph Lameter89689ae2006-12-06 20:31:45 -080046{
47 return section_to_node_table[page_to_section(page)];
48}
49EXPORT_SYMBOL(page_to_nid);
Andy Whitcroft85770ff2007-08-22 14:01:03 -070050
51static void set_section_nid(unsigned long section_nr, int nid)
52{
53 section_to_node_table[section_nr] = nid;
54}
55#else /* !NODE_NOT_IN_PAGE_FLAGS */
56static inline void set_section_nid(unsigned long section_nr, int nid)
57{
58}
Christoph Lameter89689ae2006-12-06 20:31:45 -080059#endif
60
Bob Picco3e347262005-09-03 15:54:28 -070061#ifdef CONFIG_SPARSEMEM_EXTREME
Sam Ravnborg577a32f2007-05-17 23:29:25 +020062static struct mem_section noinline __init_refok *sparse_index_alloc(int nid)
Bob Picco802f1922005-09-03 15:54:26 -070063{
Dave Hansen28ae55c2005-09-03 15:54:29 -070064 struct mem_section *section = NULL;
65 unsigned long array_size = SECTIONS_PER_ROOT *
66 sizeof(struct mem_section);
Bob Picco802f1922005-09-03 15:54:26 -070067
Shaohua Lif52407c2009-09-21 17:01:19 -070068 if (slab_is_available()) {
69 if (node_state(nid, N_HIGH_MEMORY))
Gavin Shan5b760e62012-07-31 16:46:02 -070070 section = kzalloc_node(array_size, GFP_KERNEL, nid);
Shaohua Lif52407c2009-09-21 17:01:19 -070071 else
Gavin Shan5b760e62012-07-31 16:46:02 -070072 section = kzalloc(array_size, GFP_KERNEL);
73 } else {
Santosh Shilimkarbb016b82014-01-21 15:50:34 -080074 section = memblock_virt_alloc_node(array_size, nid);
Gavin Shan5b760e62012-07-31 16:46:02 -070075 }
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{
Dave Hansen28ae55c2005-09-03 15:54:29 -070082 unsigned long root = SECTION_NR_TO_ROOT(section_nr);
83 struct mem_section *section;
Dave Hansen28ae55c2005-09-03 15:54:29 -070084
85 if (mem_section[root])
86 return -EEXIST;
87
88 section = sparse_index_alloc(nid);
WANG Congaf0cd5a2007-12-17 16:19:58 -080089 if (!section)
90 return -ENOMEM;
Dave Hansen28ae55c2005-09-03 15:54:29 -070091
92 mem_section[root] = section;
Gavin Shanc1c95182012-07-31 16:46:06 -070093
Zhang Yanfei9d1936c2013-05-17 22:10:38 +080094 return 0;
Dave Hansen28ae55c2005-09-03 15:54:29 -070095}
96#else /* !SPARSEMEM_EXTREME */
97static inline int sparse_index_init(unsigned long section_nr, int nid)
98{
99 return 0;
100}
101#endif
102
Dave Hansen4ca644d2005-10-29 18:16:51 -0700103/*
104 * Although written for the SPARSEMEM_EXTREME case, this happens
Andy Whitcroftcd881a62007-10-16 01:24:10 -0700105 * to also work for the flat array case because
Dave Hansen4ca644d2005-10-29 18:16:51 -0700106 * NR_SECTION_ROOTS==NR_MEM_SECTIONS.
107 */
108int __section_nr(struct mem_section* ms)
109{
110 unsigned long root_nr;
111 struct mem_section* root;
112
Mike Kravetz12783b02006-05-20 15:00:05 -0700113 for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) {
114 root = __nr_to_section(root_nr * SECTIONS_PER_ROOT);
Dave Hansen4ca644d2005-10-29 18:16:51 -0700115 if (!root)
116 continue;
117
118 if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT)))
119 break;
120 }
121
Gavin Shandb36a462012-07-31 16:46:04 -0700122 VM_BUG_ON(root_nr == NR_SECTION_ROOTS);
123
Dave Hansen4ca644d2005-10-29 18:16:51 -0700124 return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
125}
126
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700127/*
128 * During early boot, before section_mem_map is used for an actual
129 * mem_map, we use section_mem_map to store the section's NUMA
130 * node. This keeps us from having to use another data structure. The
131 * node information is cleared just before we store the real mem_map.
132 */
133static inline unsigned long sparse_encode_early_nid(int nid)
134{
135 return (nid << SECTION_NID_SHIFT);
136}
137
138static inline int sparse_early_nid(struct mem_section *section)
139{
140 return (section->section_mem_map >> SECTION_NID_SHIFT);
141}
142
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700143/* Validate the physical addressing limitations of the model */
144void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
145 unsigned long *end_pfn)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700146{
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700147 unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700148
Ingo Molnarbead9a32008-04-16 01:40:00 +0200149 /*
150 * Sanity checks - do not allow an architecture to pass
151 * in larger pfns than the maximum scope of sparsemem:
152 */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700153 if (*start_pfn > max_sparsemem_pfn) {
154 mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
155 "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
156 *start_pfn, *end_pfn, max_sparsemem_pfn);
157 WARN_ON_ONCE(1);
158 *start_pfn = max_sparsemem_pfn;
159 *end_pfn = max_sparsemem_pfn;
Cyrill Gorcunovef161a92009-03-31 15:19:25 -0700160 } else if (*end_pfn > max_sparsemem_pfn) {
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700161 mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
162 "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
163 *start_pfn, *end_pfn, max_sparsemem_pfn);
164 WARN_ON_ONCE(1);
165 *end_pfn = max_sparsemem_pfn;
166 }
167}
168
169/* Record a memory area against a node. */
170void __init memory_present(int nid, unsigned long start, unsigned long end)
171{
172 unsigned long pfn;
Ingo Molnarbead9a32008-04-16 01:40:00 +0200173
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700174 start &= PAGE_SECTION_MASK;
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700175 mminit_validate_memmodel_limits(&start, &end);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700176 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
177 unsigned long section = pfn_to_section_nr(pfn);
Bob Picco802f1922005-09-03 15:54:26 -0700178 struct mem_section *ms;
179
180 sparse_index_init(section, nid);
Andy Whitcroft85770ff2007-08-22 14:01:03 -0700181 set_section_nid(section, nid);
Bob Picco802f1922005-09-03 15:54:26 -0700182
183 ms = __nr_to_section(section);
184 if (!ms->section_mem_map)
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700185 ms->section_mem_map = sparse_encode_early_nid(nid) |
186 SECTION_MARKED_PRESENT;
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700187 }
188}
189
190/*
191 * Only used by the i386 NUMA architecures, but relatively
192 * generic code.
193 */
194unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn,
195 unsigned long end_pfn)
196{
197 unsigned long pfn;
198 unsigned long nr_pages = 0;
199
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700200 mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700201 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
202 if (nid != early_pfn_to_nid(pfn))
203 continue;
204
Andy Whitcroft540557b2007-10-16 01:24:11 -0700205 if (pfn_present(pfn))
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700206 nr_pages += PAGES_PER_SECTION;
207 }
208
209 return nr_pages * sizeof(struct page);
210}
211
212/*
Andy Whitcroft29751f62005-06-23 00:08:00 -0700213 * Subtle, we encode the real pfn into the mem_map such that
214 * the identity pfn - section_mem_map will return the actual
215 * physical page frame number.
216 */
217static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
218{
219 return (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
220}
221
222/*
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700223 * Decode mem_map from the coded memmap
Andy Whitcroft29751f62005-06-23 00:08:00 -0700224 */
Andy Whitcroft29751f62005-06-23 00:08:00 -0700225struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
226{
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700227 /* mask off the extra low bits of information */
228 coded_mem_map &= SECTION_MAP_MASK;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700229 return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
230}
231
Yasunori Gotoa3142c82007-05-08 00:23:07 -0700232static int __meminit sparse_init_one_section(struct mem_section *ms,
Mel Gorman5c0e3062007-10-16 01:25:56 -0700233 unsigned long pnum, struct page *mem_map,
234 unsigned long *pageblock_bitmap)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700235{
Andy Whitcroft540557b2007-10-16 01:24:11 -0700236 if (!present_section(ms))
Andy Whitcroft29751f62005-06-23 00:08:00 -0700237 return -EINVAL;
238
Andy Whitcroft30c253e2006-06-23 02:03:41 -0700239 ms->section_mem_map &= ~SECTION_MAP_MASK;
Andy Whitcroft540557b2007-10-16 01:24:11 -0700240 ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
241 SECTION_HAS_MEM_MAP;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700242 ms->pageblock_flags = pageblock_bitmap;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700243
244 return 1;
245}
246
Yasunori Goto04753272008-04-28 02:13:31 -0700247unsigned long usemap_size(void)
Mel Gorman5c0e3062007-10-16 01:25:56 -0700248{
249 unsigned long size_bytes;
250 size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
251 size_bytes = roundup(size_bytes, sizeof(unsigned long));
252 return size_bytes;
253}
254
255#ifdef CONFIG_MEMORY_HOTPLUG
256static unsigned long *__kmalloc_section_usemap(void)
257{
258 return kmalloc(usemap_size(), GFP_KERNEL);
259}
260#endif /* CONFIG_MEMORY_HOTPLUG */
261
Yasunori Goto48c90682008-07-23 21:28:15 -0700262#ifdef CONFIG_MEMORY_HOTREMOVE
263static unsigned long * __init
Yinghai Lua4322e12010-02-10 01:20:21 -0800264sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
Johannes Weiner238305b2012-05-29 15:06:36 -0700265 unsigned long size)
Yasunori Goto48c90682008-07-23 21:28:15 -0700266{
Yinghai Lu99ab7b12012-07-11 14:02:53 -0700267 unsigned long goal, limit;
268 unsigned long *p;
269 int nid;
Yasunori Goto48c90682008-07-23 21:28:15 -0700270 /*
271 * A page may contain usemaps for other sections preventing the
272 * page being freed and making a section unremovable while
Li Zhongc800bcd2014-03-31 16:41:58 +0800273 * other sections referencing the usemap remain active. Similarly,
Yasunori Goto48c90682008-07-23 21:28:15 -0700274 * a pgdat can prevent a section being removed. If section A
275 * contains a pgdat and section B contains the usemap, both
276 * sections become inter-dependent. This allocates usemaps
277 * from the same section as the pgdat where possible to avoid
278 * this problem.
279 */
Yinghai Lu07b4e2b2012-07-11 14:02:51 -0700280 goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT);
Yinghai Lu99ab7b12012-07-11 14:02:53 -0700281 limit = goal + (1UL << PA_SECTION_SHIFT);
282 nid = early_pfn_to_nid(goal >> PAGE_SHIFT);
283again:
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800284 p = memblock_virt_alloc_try_nid_nopanic(size,
285 SMP_CACHE_BYTES, goal, limit,
286 nid);
Yinghai Lu99ab7b12012-07-11 14:02:53 -0700287 if (!p && limit) {
288 limit = 0;
289 goto again;
290 }
291 return p;
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) {
Joe Perches11705322016-03-17 14:19:50 -0700316 pr_info("node %d must be removed before remove section %ld\n",
317 nid, usemap_snr);
Yasunori Goto48c90682008-07-23 21:28:15 -0700318 return;
319 }
320 /*
321 * There is a circular dependency.
322 * Some platforms allow un-removable section because they will just
323 * gather other removable sections for dynamic partitioning.
324 * Just notify un-removable section's number here.
325 */
Joe Perches11705322016-03-17 14:19:50 -0700326 pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n",
327 usemap_snr, pgdat_snr, nid);
Yasunori Goto48c90682008-07-23 21:28:15 -0700328}
329#else
330static unsigned long * __init
Yinghai Lua4322e12010-02-10 01:20:21 -0800331sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
Johannes Weiner238305b2012-05-29 15:06:36 -0700332 unsigned long size)
Yasunori Goto48c90682008-07-23 21:28:15 -0700333{
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800334 return memblock_virt_alloc_node_nopanic(size, pgdat->node_id);
Yasunori Goto48c90682008-07-23 21:28:15 -0700335}
336
337static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
338{
339}
340#endif /* CONFIG_MEMORY_HOTREMOVE */
341
Wanpeng Li18732092013-09-11 14:22:38 -0700342static void __init sparse_early_usemaps_alloc_node(void *data,
Yinghai Lua4322e12010-02-10 01:20:21 -0800343 unsigned long pnum_begin,
344 unsigned long pnum_end,
345 unsigned long usemap_count, int nodeid)
Mel Gorman5c0e3062007-10-16 01:25:56 -0700346{
Yinghai Lua4322e12010-02-10 01:20:21 -0800347 void *usemap;
348 unsigned long pnum;
Wanpeng Li18732092013-09-11 14:22:38 -0700349 unsigned long **usemap_map = (unsigned long **)data;
Yinghai Lua4322e12010-02-10 01:20:21 -0800350 int size = usemap_size();
Mel Gorman5c0e3062007-10-16 01:25:56 -0700351
Yinghai Lua4322e12010-02-10 01:20:21 -0800352 usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nodeid),
Johannes Weiner238305b2012-05-29 15:06:36 -0700353 size * usemap_count);
Nishanth Aravamudanf5bf18f2012-03-21 16:34:07 -0700354 if (!usemap) {
Joe Perches11705322016-03-17 14:19:50 -0700355 pr_warn("%s: allocation failed\n", __func__);
Johannes Weiner238305b2012-05-29 15:06:36 -0700356 return;
Yasunori Goto48c90682008-07-23 21:28:15 -0700357 }
358
Nishanth Aravamudanf5bf18f2012-03-21 16:34:07 -0700359 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
360 if (!present_section_nr(pnum))
361 continue;
362 usemap_map[pnum] = usemap;
363 usemap += size;
364 check_usemap_section_nr(nodeid, usemap_map[pnum]);
Yinghai Lua4322e12010-02-10 01:20:21 -0800365 }
Mel Gorman5c0e3062007-10-16 01:25:56 -0700366}
367
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700368#ifndef CONFIG_SPARSEMEM_VMEMMAP
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700369struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700370{
371 struct page *map;
Yinghai Lue48e67e2010-05-24 14:31:57 -0700372 unsigned long size;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700373
374 map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
375 if (map)
376 return map;
377
Yinghai Lue48e67e2010-05-24 14:31:57 -0700378 size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800379 map = memblock_virt_alloc_try_nid(size,
380 PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
381 BOOTMEM_ALLOC_ACCESSIBLE, nid);
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700382 return map;
383}
Yinghai Lu9bdac912010-02-10 01:20:22 -0800384void __init sparse_mem_maps_populate_node(struct page **map_map,
385 unsigned long pnum_begin,
386 unsigned long pnum_end,
387 unsigned long map_count, int nodeid)
388{
389 void *map;
390 unsigned long pnum;
391 unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
392
393 map = alloc_remap(nodeid, size * map_count);
394 if (map) {
395 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
396 if (!present_section_nr(pnum))
397 continue;
398 map_map[pnum] = map;
399 map += size;
400 }
401 return;
402 }
403
404 size = PAGE_ALIGN(size);
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800405 map = memblock_virt_alloc_try_nid(size * map_count,
406 PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
407 BOOTMEM_ALLOC_ACCESSIBLE, nodeid);
Yinghai Lu9bdac912010-02-10 01:20:22 -0800408 if (map) {
409 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
410 if (!present_section_nr(pnum))
411 continue;
412 map_map[pnum] = map;
413 map += size;
414 }
415 return;
416 }
417
418 /* fallback */
419 for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
420 struct mem_section *ms;
421
422 if (!present_section_nr(pnum))
423 continue;
424 map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
425 if (map_map[pnum])
426 continue;
427 ms = __nr_to_section(pnum);
Joe Perches11705322016-03-17 14:19:50 -0700428 pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
Joe Perches756a0252016-03-17 14:19:47 -0700429 __func__);
Yinghai Lu9bdac912010-02-10 01:20:22 -0800430 ms->section_mem_map = 0;
431 }
432}
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700433#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
434
Yinghai Lu81d0d952010-02-27 09:29:38 -0800435#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
Wanpeng Li18732092013-09-11 14:22:38 -0700436static void __init sparse_early_mem_maps_alloc_node(void *data,
Yinghai Lu9bdac912010-02-10 01:20:22 -0800437 unsigned long pnum_begin,
438 unsigned long pnum_end,
439 unsigned long map_count, int nodeid)
440{
Wanpeng Li18732092013-09-11 14:22:38 -0700441 struct page **map_map = (struct page **)data;
Yinghai Lu9bdac912010-02-10 01:20:22 -0800442 sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
443 map_count, nodeid);
444}
Yinghai Lu81d0d952010-02-27 09:29:38 -0800445#else
Adrian Bunk9e5c6da2008-07-25 19:46:22 -0700446static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
Christoph Lameter8f6aac42007-10-16 01:24:13 -0700447{
448 struct page *map;
449 struct mem_section *ms = __nr_to_section(pnum);
450 int nid = sparse_early_nid(ms);
451
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700452 map = sparse_mem_map_populate(pnum, nid);
Andy Whitcroft29751f62005-06-23 00:08:00 -0700453 if (map)
454 return map;
455
Joe Perches11705322016-03-17 14:19:50 -0700456 pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
Joe Perches756a0252016-03-17 14:19:47 -0700457 __func__);
Bob Picco802f1922005-09-03 15:54:26 -0700458 ms->section_mem_map = 0;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700459 return NULL;
460}
Yinghai Lu9bdac912010-02-10 01:20:22 -0800461#endif
Andy Whitcroft29751f62005-06-23 00:08:00 -0700462
Gideon Israel Dsouza3b321232014-04-07 15:37:26 -0700463void __weak __meminit vmemmap_populate_print_last(void)
Yinghai Luc2b91e22008-04-12 01:19:24 -0700464{
465}
Yinghai Lua4322e12010-02-10 01:20:21 -0800466
Wanpeng Li18732092013-09-11 14:22:38 -0700467/**
468 * alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap
469 * @map: usemap_map for pageblock flags or mmap_map for vmemmap
Stephen Rothwell193faea2007-06-08 13:46:51 -0700470 */
Wanpeng Li18732092013-09-11 14:22:38 -0700471static void __init alloc_usemap_and_memmap(void (*alloc_func)
472 (void *, unsigned long, unsigned long,
473 unsigned long, int), void *data)
Stephen Rothwell193faea2007-06-08 13:46:51 -0700474{
475 unsigned long pnum;
Wanpeng Li18732092013-09-11 14:22:38 -0700476 unsigned long map_count;
Yinghai Lua4322e12010-02-10 01:20:21 -0800477 int nodeid_begin = 0;
478 unsigned long pnum_begin = 0;
Yinghai Lu9bdac912010-02-10 01:20:22 -0800479
480 for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
481 struct mem_section *ms;
482
483 if (!present_section_nr(pnum))
484 continue;
485 ms = __nr_to_section(pnum);
486 nodeid_begin = sparse_early_nid(ms);
487 pnum_begin = pnum;
488 break;
489 }
490 map_count = 1;
491 for (pnum = pnum_begin + 1; pnum < NR_MEM_SECTIONS; pnum++) {
492 struct mem_section *ms;
493 int nodeid;
494
495 if (!present_section_nr(pnum))
496 continue;
497 ms = __nr_to_section(pnum);
498 nodeid = sparse_early_nid(ms);
499 if (nodeid == nodeid_begin) {
500 map_count++;
501 continue;
502 }
503 /* ok, we need to take cake of from pnum_begin to pnum - 1*/
Wanpeng Li18732092013-09-11 14:22:38 -0700504 alloc_func(data, pnum_begin, pnum,
505 map_count, nodeid_begin);
Yinghai Lu9bdac912010-02-10 01:20:22 -0800506 /* new start, update count etc*/
507 nodeid_begin = nodeid;
508 pnum_begin = pnum;
509 map_count = 1;
510 }
511 /* ok, last chunk */
Wanpeng Li18732092013-09-11 14:22:38 -0700512 alloc_func(data, pnum_begin, NR_MEM_SECTIONS,
513 map_count, nodeid_begin);
514}
515
516/*
517 * Allocate the accumulated non-linear sections, allocate a mem_map
518 * for each and record the physical to section mapping.
519 */
520void __init sparse_init(void)
521{
522 unsigned long pnum;
523 struct page *map;
524 unsigned long *usemap;
525 unsigned long **usemap_map;
526 int size;
527#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
528 int size2;
529 struct page **map_map;
530#endif
531
532 /* see include/linux/mmzone.h 'struct mem_section' definition */
533 BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
534
535 /* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */
536 set_pageblock_order();
537
538 /*
539 * map is using big page (aka 2M in x86 64 bit)
540 * usemap is less one page (aka 24 bytes)
541 * so alloc 2M (with 2M align) and 24 bytes in turn will
542 * make next 2M slip to one more 2M later.
543 * then in big system, the memory will have a lot of holes...
544 * here try to allocate 2M pages continuously.
545 *
546 * powerpc need to call sparse_init_one_section right after each
547 * sparse_early_mem_map_alloc, so allocate usemap_map at first.
548 */
549 size = sizeof(unsigned long *) * NR_MEM_SECTIONS;
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800550 usemap_map = memblock_virt_alloc(size, 0);
Wanpeng Li18732092013-09-11 14:22:38 -0700551 if (!usemap_map)
552 panic("can not allocate usemap_map\n");
553 alloc_usemap_and_memmap(sparse_early_usemaps_alloc_node,
554 (void *)usemap_map);
555
556#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
557 size2 = sizeof(struct page *) * NR_MEM_SECTIONS;
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800558 map_map = memblock_virt_alloc(size2, 0);
Wanpeng Li18732092013-09-11 14:22:38 -0700559 if (!map_map)
560 panic("can not allocate map_map\n");
561 alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node,
562 (void *)map_map);
Yinghai Lu9bdac912010-02-10 01:20:22 -0800563#endif
564
Yinghai Lue123dd32008-04-13 11:51:06 -0700565 for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
566 if (!present_section_nr(pnum))
567 continue;
568
569 usemap = usemap_map[pnum];
570 if (!usemap)
571 continue;
Stephen Rothwell193faea2007-06-08 13:46:51 -0700572
Yinghai Lu9bdac912010-02-10 01:20:22 -0800573#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
574 map = map_map[pnum];
575#else
Stephen Rothwell193faea2007-06-08 13:46:51 -0700576 map = sparse_early_mem_map_alloc(pnum);
Yinghai Lu9bdac912010-02-10 01:20:22 -0800577#endif
Stephen Rothwell193faea2007-06-08 13:46:51 -0700578 if (!map)
579 continue;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700580
Mel Gorman5c0e3062007-10-16 01:25:56 -0700581 sparse_init_one_section(__nr_to_section(pnum), pnum, map,
582 usemap);
Stephen Rothwell193faea2007-06-08 13:46:51 -0700583 }
Yinghai Lue123dd32008-04-13 11:51:06 -0700584
Yinghai Luc2b91e22008-04-12 01:19:24 -0700585 vmemmap_populate_print_last();
586
Yinghai Lu9bdac912010-02-10 01:20:22 -0800587#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800588 memblock_free_early(__pa(map_map), size2);
Yinghai Lu9bdac912010-02-10 01:20:22 -0800589#endif
Santosh Shilimkarbb016b82014-01-21 15:50:34 -0800590 memblock_free_early(__pa(usemap_map), size);
Stephen Rothwell193faea2007-06-08 13:46:51 -0700591}
592
593#ifdef CONFIG_MEMORY_HOTPLUG
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700594#ifdef CONFIG_SPARSEMEM_VMEMMAP
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800595static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid)
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700596{
597 /* This will make the necessary allocations eventually. */
598 return sparse_mem_map_populate(pnum, nid);
599}
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800600static void __kfree_section_memmap(struct page *memmap)
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700601{
Johannes Weiner0aad8182013-04-29 15:07:50 -0700602 unsigned long start = (unsigned long)memmap;
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800603 unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
Johannes Weiner0aad8182013-04-29 15:07:50 -0700604
605 vmemmap_free(start, end);
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700606}
David Rientjes4edd7ce2013-04-29 15:08:22 -0700607#ifdef CONFIG_MEMORY_HOTREMOVE
Zhang Yanfei81556b02013-11-12 15:07:43 -0800608static void free_map_bootmem(struct page *memmap)
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700609{
Johannes Weiner0aad8182013-04-29 15:07:50 -0700610 unsigned long start = (unsigned long)memmap;
Zhang Yanfei81556b02013-11-12 15:07:43 -0800611 unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
Johannes Weiner0aad8182013-04-29 15:07:50 -0700612
613 vmemmap_free(start, end);
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700614}
David Rientjes4edd7ce2013-04-29 15:08:22 -0700615#endif /* CONFIG_MEMORY_HOTREMOVE */
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700616#else
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800617static struct page *__kmalloc_section_memmap(void)
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700618{
619 struct page *page, *ret;
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800620 unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700621
Yasunori Gotof2d0aa52006-10-28 10:38:32 -0700622 page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700623 if (page)
624 goto got_map_page;
625
626 ret = vmalloc(memmap_size);
627 if (ret)
628 goto got_map_ptr;
629
630 return NULL;
631got_map_page:
632 ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
633got_map_ptr:
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700634
635 return ret;
636}
637
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800638static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid)
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700639{
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800640 return __kmalloc_section_memmap();
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700641}
642
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800643static void __kfree_section_memmap(struct page *memmap)
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700644{
Christoph Lameter9e2779f2008-02-04 22:28:34 -0800645 if (is_vmalloc_addr(memmap))
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700646 vfree(memmap);
647 else
648 free_pages((unsigned long)memmap,
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800649 get_order(sizeof(struct page) * PAGES_PER_SECTION));
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700650}
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700651
David Rientjes4edd7ce2013-04-29 15:08:22 -0700652#ifdef CONFIG_MEMORY_HOTREMOVE
Zhang Yanfei81556b02013-11-12 15:07:43 -0800653static void free_map_bootmem(struct page *memmap)
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700654{
655 unsigned long maps_section_nr, removing_section_nr, i;
Zhang Yanfei81556b02013-11-12 15:07:43 -0800656 unsigned long magic, nr_pages;
Jianguo Wuae64ffc2012-11-29 13:54:21 -0800657 struct page *page = virt_to_page(memmap);
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700658
Zhang Yanfei81556b02013-11-12 15:07:43 -0800659 nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
660 >> PAGE_SHIFT;
661
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700662 for (i = 0; i < nr_pages; i++, page++) {
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800663 magic = (unsigned long) page->lru.next;
Yasunori Goto0c0a4a52008-04-28 02:13:34 -0700664
665 BUG_ON(magic == NODE_INFO);
666
667 maps_section_nr = pfn_to_section_nr(page_to_pfn(page));
668 removing_section_nr = page->private;
669
670 /*
671 * When this function is called, the removing section is
672 * logical offlined state. This means all pages are isolated
673 * from page allocator. If removing section's memmap is placed
674 * on the same section, it must not be freed.
675 * If it is freed, page allocator may allocate it which will
676 * be removed physically soon.
677 */
678 if (maps_section_nr != removing_section_nr)
679 put_page_bootmem(page);
680 }
681}
David Rientjes4edd7ce2013-04-29 15:08:22 -0700682#endif /* CONFIG_MEMORY_HOTREMOVE */
Yasunori Goto98f3cfc2007-10-16 01:26:14 -0700683#endif /* CONFIG_SPARSEMEM_VMEMMAP */
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700684
Andy Whitcroft29751f62005-06-23 00:08:00 -0700685/*
Andy Whitcroft29751f62005-06-23 00:08:00 -0700686 * returns the number of sections whose mem_maps were properly
687 * set. If this is <=0, then that means that the passed-in
688 * map was not consumed and must be freed.
689 */
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800690int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
Andy Whitcroft29751f62005-06-23 00:08:00 -0700691{
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700692 unsigned long section_nr = pfn_to_section_nr(start_pfn);
693 struct pglist_data *pgdat = zone->zone_pgdat;
694 struct mem_section *ms;
695 struct page *memmap;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700696 unsigned long *usemap;
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700697 unsigned long flags;
698 int ret;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700699
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700700 /*
701 * no locking for this, because it does its own
702 * plus, it does a kmalloc
703 */
WANG Congbbd06822007-12-17 16:19:59 -0800704 ret = sparse_index_init(section_nr, pgdat->node_id);
705 if (ret < 0 && ret != -EEXIST)
706 return ret;
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800707 memmap = kmalloc_section_memmap(section_nr, pgdat->node_id);
WANG Congbbd06822007-12-17 16:19:59 -0800708 if (!memmap)
709 return -ENOMEM;
Mel Gorman5c0e3062007-10-16 01:25:56 -0700710 usemap = __kmalloc_section_usemap();
WANG Congbbd06822007-12-17 16:19:59 -0800711 if (!usemap) {
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800712 __kfree_section_memmap(memmap);
WANG Congbbd06822007-12-17 16:19:59 -0800713 return -ENOMEM;
714 }
Andy Whitcroft29751f62005-06-23 00:08:00 -0700715
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700716 pgdat_resize_lock(pgdat, &flags);
717
718 ms = __pfn_to_section(start_pfn);
719 if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
720 ret = -EEXIST;
721 goto out;
722 }
Mel Gorman5c0e3062007-10-16 01:25:56 -0700723
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800724 memset(memmap, 0, sizeof(struct page) * PAGES_PER_SECTION);
Wen Congyang3ac19f82012-12-11 16:00:59 -0800725
Andy Whitcroft29751f62005-06-23 00:08:00 -0700726 ms->section_mem_map |= SECTION_MARKED_PRESENT;
727
Mel Gorman5c0e3062007-10-16 01:25:56 -0700728 ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700729
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700730out:
731 pgdat_resize_unlock(pgdat, &flags);
WANG Congbbd06822007-12-17 16:19:59 -0800732 if (ret <= 0) {
733 kfree(usemap);
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800734 __kfree_section_memmap(memmap);
WANG Congbbd06822007-12-17 16:19:59 -0800735 }
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700736 return ret;
Andy Whitcroft29751f62005-06-23 00:08:00 -0700737}
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700738
Zhang Yanfeif3deb682013-07-08 16:00:10 -0700739#ifdef CONFIG_MEMORY_HOTREMOVE
Wen Congyang95a47742012-12-11 16:00:47 -0800740#ifdef CONFIG_MEMORY_FAILURE
741static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
742{
743 int i;
744
745 if (!memmap)
746 return;
747
Dan Williams4b94ffd2016-01-15 16:56:22 -0800748 for (i = 0; i < nr_pages; i++) {
Wen Congyang95a47742012-12-11 16:00:47 -0800749 if (PageHWPoison(&memmap[i])) {
Xishi Qiu293c07e2013-02-22 16:34:02 -0800750 atomic_long_sub(1, &num_poisoned_pages);
Wen Congyang95a47742012-12-11 16:00:47 -0800751 ClearPageHWPoison(&memmap[i]);
752 }
753 }
754}
755#else
756static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
757{
758}
759#endif
760
David Rientjes4edd7ce2013-04-29 15:08:22 -0700761static void free_section_usemap(struct page *memmap, unsigned long *usemap)
762{
763 struct page *usemap_page;
David Rientjes4edd7ce2013-04-29 15:08:22 -0700764
765 if (!usemap)
766 return;
767
768 usemap_page = virt_to_page(usemap);
769 /*
770 * Check to see if allocation came from hot-plug-add
771 */
772 if (PageSlab(usemap_page) || PageCompound(usemap_page)) {
773 kfree(usemap);
774 if (memmap)
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800775 __kfree_section_memmap(memmap);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700776 return;
777 }
778
779 /*
780 * The usemap came from bootmem. This is packed with other usemaps
781 * on the section which has pgdat at boot time. Just keep it as is now.
782 */
783
Zhang Yanfei81556b02013-11-12 15:07:43 -0800784 if (memmap)
785 free_map_bootmem(memmap);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700786}
787
Dan Williams4b94ffd2016-01-15 16:56:22 -0800788void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
789 unsigned long map_offset)
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700790{
791 struct page *memmap = NULL;
Tang Chencd099682013-02-22 16:33:02 -0800792 unsigned long *usemap = NULL, flags;
793 struct pglist_data *pgdat = zone->zone_pgdat;
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700794
Tang Chencd099682013-02-22 16:33:02 -0800795 pgdat_resize_lock(pgdat, &flags);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700796 if (ms->section_mem_map) {
797 usemap = ms->pageblock_flags;
798 memmap = sparse_decode_mem_map(ms->section_mem_map,
799 __section_nr(ms));
800 ms->section_mem_map = 0;
801 ms->pageblock_flags = NULL;
802 }
Tang Chencd099682013-02-22 16:33:02 -0800803 pgdat_resize_unlock(pgdat, &flags);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700804
Dan Williams4b94ffd2016-01-15 16:56:22 -0800805 clear_hwpoisoned_pages(memmap + map_offset,
806 PAGES_PER_SECTION - map_offset);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700807 free_section_usemap(memmap, usemap);
808}
David Rientjes4edd7ce2013-04-29 15:08:22 -0700809#endif /* CONFIG_MEMORY_HOTREMOVE */
810#endif /* CONFIG_MEMORY_HOTPLUG */