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25#include <linux/mm.h>
26#include <linux/bootmem.h>
27#include <linux/memblock.h>
28#include <linux/mmzone.h>
29#include <linux/highmem.h>
30#include <linux/initrd.h>
31#include <linux/nodemask.h>
32#include <linux/module.h>
33#include <linux/kexec.h>
34#include <linux/pfn.h>
35#include <linux/swap.h>
36#include <linux/acpi.h>
37
38#include <asm/e820.h>
39#include <asm/setup.h>
40#include <asm/mmzone.h>
41#include <asm/bios_ebda.h>
42#include <asm/proto.h>
43
44struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
45EXPORT_SYMBOL(node_data);
46
47
48
49
50
51
52
53
54
55unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
56unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
57
58
59#ifdef CONFIG_DISCONTIGMEM
60
61
62
63
64
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66
67
68
69
70
71
72s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
73EXPORT_SYMBOL(physnode_map);
74
75void memory_present(int nid, unsigned long start, unsigned long end)
76{
77 unsigned long pfn;
78
79 printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
80 nid, start, end);
81 printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid);
82 printk(KERN_DEBUG " ");
83 for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
84 physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
85 printk(KERN_CONT "%lx ", pfn);
86 }
87 printk(KERN_CONT "\n");
88}
89
90unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
91 unsigned long end_pfn)
92{
93 unsigned long nr_pages = end_pfn - start_pfn;
94
95 if (!nr_pages)
96 return 0;
97
98 return (nr_pages + 1) * sizeof(struct page);
99}
100#endif
101
102extern unsigned long find_max_low_pfn(void);
103extern unsigned long highend_pfn, highstart_pfn;
104
105#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
106
107unsigned long node_remap_size[MAX_NUMNODES];
108static void *node_remap_start_vaddr[MAX_NUMNODES];
109void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
110
111static unsigned long kva_start_pfn;
112static unsigned long kva_pages;
113
114
115
116
117
118int __init get_memcfg_numa_flat(void)
119{
120 printk(KERN_DEBUG "NUMA - single node, flat memory mode\n");
121
122 node_start_pfn[0] = 0;
123 node_end_pfn[0] = max_pfn;
124 memblock_x86_register_active_regions(0, 0, max_pfn);
125 memory_present(0, 0, max_pfn);
126 node_remap_size[0] = node_memmap_size_bytes(0, 0, max_pfn);
127
128
129 nodes_clear(node_online_map);
130 node_set_online(0);
131 return 1;
132}
133
134
135
136
137static void __init propagate_e820_map_node(int nid)
138{
139 if (node_end_pfn[nid] > max_pfn)
140 node_end_pfn[nid] = max_pfn;
141
142
143
144
145 if (node_start_pfn[nid] > max_pfn)
146 node_start_pfn[nid] = max_pfn;
147 BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
148}
149
150
151
152
153
154
155
156
157static void __init allocate_pgdat(int nid)
158{
159 char buf[16];
160
161 if (node_has_online_mem(nid) && node_remap_start_vaddr[nid])
162 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
163 else {
164 unsigned long pgdat_phys;
165 pgdat_phys = memblock_find_in_range(min_low_pfn<<PAGE_SHIFT,
166 max_pfn_mapped<<PAGE_SHIFT,
167 sizeof(pg_data_t),
168 PAGE_SIZE);
169 NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
170 memset(buf, 0, sizeof(buf));
171 sprintf(buf, "NODE_DATA %d", nid);
172 memblock_x86_reserve_range(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
173 }
174 printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
175 nid, (unsigned long)NODE_DATA(nid));
176}
177
178
179
180
181
182
183
184
185
186static unsigned long node_remap_start_pfn[MAX_NUMNODES];
187static void *node_remap_end_vaddr[MAX_NUMNODES];
188static void *node_remap_alloc_vaddr[MAX_NUMNODES];
189static unsigned long node_remap_offset[MAX_NUMNODES];
190
191void *alloc_remap(int nid, unsigned long size)
192{
193 void *allocation = node_remap_alloc_vaddr[nid];
194
195 size = ALIGN(size, L1_CACHE_BYTES);
196
197 if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
198 return NULL;
199
200 node_remap_alloc_vaddr[nid] += size;
201 memset(allocation, 0, size);
202
203 return allocation;
204}
205
206static void __init remap_numa_kva(void)
207{
208 void *vaddr;
209 unsigned long pfn;
210 int node;
211
212 for_each_online_node(node) {
213 printk(KERN_DEBUG "remap_numa_kva: node %d\n", node);
214 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
215 vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
216 printk(KERN_DEBUG "remap_numa_kva: %08lx to pfn %08lx\n",
217 (unsigned long)vaddr,
218 node_remap_start_pfn[node] + pfn);
219 set_pmd_pfn((ulong) vaddr,
220 node_remap_start_pfn[node] + pfn,
221 PAGE_KERNEL_LARGE);
222 }
223 }
224}
225
226#ifdef CONFIG_HIBERNATION
227
228
229
230
231
232void resume_map_numa_kva(pgd_t *pgd_base)
233{
234 int node;
235
236 for_each_online_node(node) {
237 unsigned long start_va, start_pfn, size, pfn;
238
239 start_va = (unsigned long)node_remap_start_vaddr[node];
240 start_pfn = node_remap_start_pfn[node];
241 size = node_remap_size[node];
242
243 printk(KERN_DEBUG "%s: node %d\n", __func__, node);
244
245 for (pfn = 0; pfn < size; pfn += PTRS_PER_PTE) {
246 unsigned long vaddr = start_va + (pfn << PAGE_SHIFT);
247 pgd_t *pgd = pgd_base + pgd_index(vaddr);
248 pud_t *pud = pud_offset(pgd, vaddr);
249 pmd_t *pmd = pmd_offset(pud, vaddr);
250
251 set_pmd(pmd, pfn_pmd(start_pfn + pfn,
252 PAGE_KERNEL_LARGE_EXEC));
253
254 printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n",
255 __func__, vaddr, start_pfn + pfn);
256 }
257 }
258}
259#endif
260
261static __init unsigned long calculate_numa_remap_pages(void)
262{
263 int nid;
264 unsigned long size, reserve_pages = 0;
265
266 for_each_online_node(nid) {
267 u64 node_kva_target;
268 u64 node_kva_final;
269
270
271
272
273
274 printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n",
275 nid, node_start_pfn[nid], node_end_pfn[nid]);
276 if (node_start_pfn[nid] > max_pfn)
277 continue;
278 if (!node_end_pfn[nid])
279 continue;
280 if (node_end_pfn[nid] > max_pfn)
281 node_end_pfn[nid] = max_pfn;
282
283
284 size = node_remap_size[nid] + sizeof(pg_data_t);
285
286
287 size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
288
289 size = size * PTRS_PER_PTE;
290
291 node_kva_target = round_down(node_end_pfn[nid] - size,
292 PTRS_PER_PTE);
293 node_kva_target <<= PAGE_SHIFT;
294 do {
295 node_kva_final = memblock_find_in_range(node_kva_target,
296 ((u64)node_end_pfn[nid])<<PAGE_SHIFT,
297 ((u64)size)<<PAGE_SHIFT,
298 LARGE_PAGE_BYTES);
299 node_kva_target -= LARGE_PAGE_BYTES;
300 } while (node_kva_final == MEMBLOCK_ERROR &&
301 (node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid]));
302
303 if (node_kva_final == MEMBLOCK_ERROR)
304 panic("Can not get kva ram\n");
305
306 node_remap_size[nid] = size;
307 node_remap_offset[nid] = reserve_pages;
308 reserve_pages += size;
309 printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of"
310 " node %d at %llx\n",
311 size, nid, node_kva_final>>PAGE_SHIFT);
312
313
314
315
316
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319
320
321
322
323
324 memblock_x86_reserve_range(node_kva_final,
325 node_kva_final+(((u64)size)<<PAGE_SHIFT),
326 "KVA RAM");
327
328 node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT;
329 }
330 printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n",
331 reserve_pages);
332 return reserve_pages;
333}
334
335static void init_remap_allocator(int nid)
336{
337 node_remap_start_vaddr[nid] = pfn_to_kaddr(
338 kva_start_pfn + node_remap_offset[nid]);
339 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
340 (node_remap_size[nid] * PAGE_SIZE);
341 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
342 ALIGN(sizeof(pg_data_t), PAGE_SIZE);
343
344 printk(KERN_DEBUG "node %d will remap to vaddr %08lx - %08lx\n", nid,
345 (ulong) node_remap_start_vaddr[nid],
346 (ulong) node_remap_end_vaddr[nid]);
347}
348
349void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn,
350 int acpi, int k8)
351{
352 int nid;
353 long kva_target_pfn;
354
355
356
357
358
359
360
361
362
363 get_memcfg_numa();
364
365 kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE);
366
367 kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
368 do {
369 kva_start_pfn = memblock_find_in_range(kva_target_pfn<<PAGE_SHIFT,
370 max_low_pfn<<PAGE_SHIFT,
371 kva_pages<<PAGE_SHIFT,
372 PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT;
373 kva_target_pfn -= PTRS_PER_PTE;
374 } while (kva_start_pfn == MEMBLOCK_ERROR && kva_target_pfn > min_low_pfn);
375
376 if (kva_start_pfn == MEMBLOCK_ERROR)
377 panic("Can not get kva space\n");
378
379 printk(KERN_INFO "kva_start_pfn ~ %lx max_low_pfn ~ %lx\n",
380 kva_start_pfn, max_low_pfn);
381 printk(KERN_INFO "max_pfn = %lx\n", max_pfn);
382
383
384 memblock_x86_reserve_range(kva_start_pfn<<PAGE_SHIFT,
385 (kva_start_pfn + kva_pages)<<PAGE_SHIFT,
386 "KVA PG");
387#ifdef CONFIG_HIGHMEM
388 highstart_pfn = highend_pfn = max_pfn;
389 if (max_pfn > max_low_pfn)
390 highstart_pfn = max_low_pfn;
391 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
392 pages_to_mb(highend_pfn - highstart_pfn));
393 num_physpages = highend_pfn;
394 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
395#else
396 num_physpages = max_low_pfn;
397 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
398#endif
399 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
400 pages_to_mb(max_low_pfn));
401 printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
402 max_low_pfn, highstart_pfn);
403
404 printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
405 (ulong) pfn_to_kaddr(max_low_pfn));
406 for_each_online_node(nid) {
407 init_remap_allocator(nid);
408
409 allocate_pgdat(nid);
410 }
411 remap_numa_kva();
412
413 printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
414 (ulong) pfn_to_kaddr(highstart_pfn));
415 for_each_online_node(nid)
416 propagate_e820_map_node(nid);
417
418 for_each_online_node(nid) {
419 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
420 NODE_DATA(nid)->node_id = nid;
421 }
422
423 setup_bootmem_allocator();
424}
425
426#ifdef CONFIG_MEMORY_HOTPLUG
427static int paddr_to_nid(u64 addr)
428{
429 int nid;
430 unsigned long pfn = PFN_DOWN(addr);
431
432 for_each_node(nid)
433 if (node_start_pfn[nid] <= pfn &&
434 pfn < node_end_pfn[nid])
435 return nid;
436
437 return -1;
438}
439
440
441
442
443
444
445int memory_add_physaddr_to_nid(u64 addr)
446{
447 int nid = paddr_to_nid(addr);
448 return (nid >= 0) ? nid : 0;
449}
450
451EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
452#endif
453
454