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25#include <linux/mm.h>
26#include <linux/bootmem.h>
27#include <linux/mmzone.h>
28#include <linux/highmem.h>
29#include <linux/initrd.h>
30#include <linux/nodemask.h>
31#include <linux/module.h>
32#include <linux/kexec.h>
33#include <linux/pfn.h>
34#include <linux/swap.h>
35#include <linux/acpi.h>
36
37#include <asm/e820.h>
38#include <asm/setup.h>
39#include <asm/mmzone.h>
40#include <asm/bios_ebda.h>
41#include <asm/proto.h>
42
43struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
44EXPORT_SYMBOL(node_data);
45
46
47
48
49
50
51
52
53
54unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
55unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
56
57
58#ifdef CONFIG_DISCONTIGMEM
59
60
61
62
63
64
65
66
67
68
69
70
71s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
72EXPORT_SYMBOL(physnode_map);
73
74void memory_present(int nid, unsigned long start, unsigned long end)
75{
76 unsigned long pfn;
77
78 printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
79 nid, start, end);
80 printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid);
81 printk(KERN_DEBUG " ");
82 for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
83 physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
84 printk(KERN_CONT "%lx ", pfn);
85 }
86 printk(KERN_CONT "\n");
87}
88
89unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
90 unsigned long end_pfn)
91{
92 unsigned long nr_pages = end_pfn - start_pfn;
93
94 if (!nr_pages)
95 return 0;
96
97 return (nr_pages + 1) * sizeof(struct page);
98}
99#endif
100
101extern unsigned long find_max_low_pfn(void);
102extern unsigned long highend_pfn, highstart_pfn;
103
104#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
105
106unsigned long node_remap_size[MAX_NUMNODES];
107static void *node_remap_start_vaddr[MAX_NUMNODES];
108void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
109
110static unsigned long kva_start_pfn;
111static unsigned long kva_pages;
112
113
114
115
116
117int __init get_memcfg_numa_flat(void)
118{
119 printk(KERN_DEBUG "NUMA - single node, flat memory mode\n");
120
121 node_start_pfn[0] = 0;
122 node_end_pfn[0] = max_pfn;
123 e820_register_active_regions(0, 0, max_pfn);
124 memory_present(0, 0, max_pfn);
125 node_remap_size[0] = node_memmap_size_bytes(0, 0, max_pfn);
126
127
128 nodes_clear(node_online_map);
129 node_set_online(0);
130 return 1;
131}
132
133
134
135
136static void __init propagate_e820_map_node(int nid)
137{
138 if (node_end_pfn[nid] > max_pfn)
139 node_end_pfn[nid] = max_pfn;
140
141
142
143
144 if (node_start_pfn[nid] > max_pfn)
145 node_start_pfn[nid] = max_pfn;
146 BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
147}
148
149
150
151
152
153
154
155
156static void __init allocate_pgdat(int nid)
157{
158 char buf[16];
159
160 if (node_has_online_mem(nid) && node_remap_start_vaddr[nid])
161 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
162 else {
163 unsigned long pgdat_phys;
164 pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
165 max_pfn_mapped<<PAGE_SHIFT,
166 sizeof(pg_data_t),
167 PAGE_SIZE);
168 NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
169 memset(buf, 0, sizeof(buf));
170 sprintf(buf, "NODE_DATA %d", nid);
171 reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
172 }
173 printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
174 nid, (unsigned long)NODE_DATA(nid));
175}
176
177
178
179
180
181
182
183
184
185static unsigned long node_remap_start_pfn[MAX_NUMNODES];
186static void *node_remap_end_vaddr[MAX_NUMNODES];
187static void *node_remap_alloc_vaddr[MAX_NUMNODES];
188static unsigned long node_remap_offset[MAX_NUMNODES];
189
190void *alloc_remap(int nid, unsigned long size)
191{
192 void *allocation = node_remap_alloc_vaddr[nid];
193
194 size = ALIGN(size, L1_CACHE_BYTES);
195
196 if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
197 return NULL;
198
199 node_remap_alloc_vaddr[nid] += size;
200 memset(allocation, 0, size);
201
202 return allocation;
203}
204
205static void __init remap_numa_kva(void)
206{
207 void *vaddr;
208 unsigned long pfn;
209 int node;
210
211 for_each_online_node(node) {
212 printk(KERN_DEBUG "remap_numa_kva: node %d\n", node);
213 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
214 vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
215 printk(KERN_DEBUG "remap_numa_kva: %08lx to pfn %08lx\n",
216 (unsigned long)vaddr,
217 node_remap_start_pfn[node] + pfn);
218 set_pmd_pfn((ulong) vaddr,
219 node_remap_start_pfn[node] + pfn,
220 PAGE_KERNEL_LARGE);
221 }
222 }
223}
224
225#ifdef CONFIG_HIBERNATION
226
227
228
229
230
231void resume_map_numa_kva(pgd_t *pgd_base)
232{
233 int node;
234
235 for_each_online_node(node) {
236 unsigned long start_va, start_pfn, size, pfn;
237
238 start_va = (unsigned long)node_remap_start_vaddr[node];
239 start_pfn = node_remap_start_pfn[node];
240 size = node_remap_size[node];
241
242 printk(KERN_DEBUG "%s: node %d\n", __func__, node);
243
244 for (pfn = 0; pfn < size; pfn += PTRS_PER_PTE) {
245 unsigned long vaddr = start_va + (pfn << PAGE_SHIFT);
246 pgd_t *pgd = pgd_base + pgd_index(vaddr);
247 pud_t *pud = pud_offset(pgd, vaddr);
248 pmd_t *pmd = pmd_offset(pud, vaddr);
249
250 set_pmd(pmd, pfn_pmd(start_pfn + pfn,
251 PAGE_KERNEL_LARGE_EXEC));
252
253 printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n",
254 __func__, vaddr, start_pfn + pfn);
255 }
256 }
257}
258#endif
259
260static __init unsigned long calculate_numa_remap_pages(void)
261{
262 int nid;
263 unsigned long size, reserve_pages = 0;
264
265 for_each_online_node(nid) {
266 u64 node_kva_target;
267 u64 node_kva_final;
268
269
270
271
272
273 printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n",
274 nid, node_start_pfn[nid], node_end_pfn[nid]);
275 if (node_start_pfn[nid] > max_pfn)
276 continue;
277 if (!node_end_pfn[nid])
278 continue;
279 if (node_end_pfn[nid] > max_pfn)
280 node_end_pfn[nid] = max_pfn;
281
282
283 size = node_remap_size[nid] + sizeof(pg_data_t);
284
285
286 size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
287
288 size = size * PTRS_PER_PTE;
289
290 node_kva_target = round_down(node_end_pfn[nid] - size,
291 PTRS_PER_PTE);
292 node_kva_target <<= PAGE_SHIFT;
293 do {
294 node_kva_final = find_e820_area(node_kva_target,
295 ((u64)node_end_pfn[nid])<<PAGE_SHIFT,
296 ((u64)size)<<PAGE_SHIFT,
297 LARGE_PAGE_BYTES);
298 node_kva_target -= LARGE_PAGE_BYTES;
299 } while (node_kva_final == -1ULL &&
300 (node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid]));
301
302 if (node_kva_final == -1ULL)
303 panic("Can not get kva ram\n");
304
305 node_remap_size[nid] = size;
306 node_remap_offset[nid] = reserve_pages;
307 reserve_pages += size;
308 printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of"
309 " node %d at %llx\n",
310 size, nid, node_kva_final>>PAGE_SHIFT);
311
312
313
314
315
316
317
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319
320
321
322
323 reserve_early(node_kva_final,
324 node_kva_final+(((u64)size)<<PAGE_SHIFT),
325 "KVA RAM");
326
327 node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT;
328 remove_active_range(nid, node_remap_start_pfn[nid],
329 node_remap_start_pfn[nid] + size);
330 }
331 printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n",
332 reserve_pages);
333 return reserve_pages;
334}
335
336static void init_remap_allocator(int nid)
337{
338 node_remap_start_vaddr[nid] = pfn_to_kaddr(
339 kva_start_pfn + node_remap_offset[nid]);
340 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
341 (node_remap_size[nid] * PAGE_SIZE);
342 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
343 ALIGN(sizeof(pg_data_t), PAGE_SIZE);
344
345 printk(KERN_DEBUG "node %d will remap to vaddr %08lx - %08lx\n", nid,
346 (ulong) node_remap_start_vaddr[nid],
347 (ulong) node_remap_end_vaddr[nid]);
348}
349
350void __init initmem_init(unsigned long start_pfn,
351 unsigned long end_pfn)
352{
353 int nid;
354 long kva_target_pfn;
355
356
357
358
359
360
361
362
363
364 get_memcfg_numa();
365
366 kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE);
367
368 kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
369 do {
370 kva_start_pfn = find_e820_area(kva_target_pfn<<PAGE_SHIFT,
371 max_low_pfn<<PAGE_SHIFT,
372 kva_pages<<PAGE_SHIFT,
373 PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT;
374 kva_target_pfn -= PTRS_PER_PTE;
375 } while (kva_start_pfn == -1UL && kva_target_pfn > min_low_pfn);
376
377 if (kva_start_pfn == -1UL)
378 panic("Can not get kva space\n");
379
380 printk(KERN_INFO "kva_start_pfn ~ %lx max_low_pfn ~ %lx\n",
381 kva_start_pfn, max_low_pfn);
382 printk(KERN_INFO "max_pfn = %lx\n", max_pfn);
383
384
385 reserve_early(kva_start_pfn<<PAGE_SHIFT,
386 (kva_start_pfn + kva_pages)<<PAGE_SHIFT,
387 "KVA PG");
388#ifdef CONFIG_HIGHMEM
389 highstart_pfn = highend_pfn = max_pfn;
390 if (max_pfn > max_low_pfn)
391 highstart_pfn = max_low_pfn;
392 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
393 pages_to_mb(highend_pfn - highstart_pfn));
394 num_physpages = highend_pfn;
395 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
396#else
397 num_physpages = max_low_pfn;
398 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
399#endif
400 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
401 pages_to_mb(max_low_pfn));
402 printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
403 max_low_pfn, highstart_pfn);
404
405 printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
406 (ulong) pfn_to_kaddr(max_low_pfn));
407 for_each_online_node(nid) {
408 init_remap_allocator(nid);
409
410 allocate_pgdat(nid);
411 }
412 remap_numa_kva();
413
414 printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
415 (ulong) pfn_to_kaddr(highstart_pfn));
416 for_each_online_node(nid)
417 propagate_e820_map_node(nid);
418
419 for_each_online_node(nid) {
420 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
421 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
422 }
423
424 setup_bootmem_allocator();
425}
426
427#ifdef CONFIG_MEMORY_HOTPLUG
428static int paddr_to_nid(u64 addr)
429{
430 int nid;
431 unsigned long pfn = PFN_DOWN(addr);
432
433 for_each_node(nid)
434 if (node_start_pfn[nid] <= pfn &&
435 pfn < node_end_pfn[nid])
436 return nid;
437
438 return -1;
439}
440
441
442
443
444
445
446int memory_add_physaddr_to_nid(u64 addr)
447{
448 int nid = paddr_to_nid(addr);
449 return (nid >= 0) ? nid : 0;
450}
451
452EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
453#endif
454
455