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a678c2be
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1/*
2 * early_res, could be used to replace bootmem
3 */
4#include <linux/kernel.h>
5#include <linux/types.h>
6#include <linux/init.h>
7#include <linux/bootmem.h>
8#include <linux/mm.h>
580e0ad2 9#include <linux/early_res.h>
a678c2be
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10
11/*
12 * Early reserved memory areas.
13 */
14/*
15 * need to make sure this one is bigger enough before
dd645cee 16 * find_fw_memmap_area could be used
a678c2be
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17 */
18#define MAX_EARLY_RES_X 32
19
20struct early_res {
21 u64 start, end;
22 char name[15];
23 char overlap_ok;
24};
25static struct early_res early_res_x[MAX_EARLY_RES_X] __initdata;
26
27static int max_early_res __initdata = MAX_EARLY_RES_X;
28static struct early_res *early_res __initdata = &early_res_x[0];
29static int early_res_count __initdata;
30
31static int __init find_overlapped_early(u64 start, u64 end)
32{
33 int i;
34 struct early_res *r;
35
36 for (i = 0; i < max_early_res && early_res[i].end; i++) {
37 r = &early_res[i];
38 if (end > r->start && start < r->end)
39 break;
40 }
41
42 return i;
43}
44
45/*
46 * Drop the i-th range from the early reservation map,
47 * by copying any higher ranges down one over it, and
48 * clearing what had been the last slot.
49 */
50static void __init drop_range(int i)
51{
52 int j;
53
54 for (j = i + 1; j < max_early_res && early_res[j].end; j++)
55 ;
56
57 memmove(&early_res[i], &early_res[i + 1],
58 (j - 1 - i) * sizeof(struct early_res));
59
60 early_res[j - 1].end = 0;
61 early_res_count--;
62}
63
fb90ef93
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64static void __init drop_range_partial(int i, u64 start, u64 end)
65{
66 u64 common_start, common_end;
67 u64 old_start, old_end;
68
69 old_start = early_res[i].start;
70 old_end = early_res[i].end;
71 common_start = max(old_start, start);
72 common_end = min(old_end, end);
73
74 /* no overlap ? */
75 if (common_start >= common_end)
76 return;
77
78 if (old_start < common_start) {
79 /* make head segment */
80 early_res[i].end = common_start;
81 if (old_end > common_end) {
dce46a04
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82 char name[15];
83
84 /*
85 * Save a local copy of the name, since the
86 * early_res array could get resized inside
87 * reserve_early_without_check() ->
88 * __check_and_double_early_res(), which would
89 * make the current name pointer invalid.
90 */
91 strncpy(name, early_res[i].name,
92 sizeof(early_res[i].name) - 1);
fb90ef93 93 /* add another for left over on tail */
dce46a04 94 reserve_early_without_check(common_end, old_end, name);
fb90ef93
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95 }
96 return;
97 } else {
98 if (old_end > common_end) {
99 /* reuse the entry for tail left */
100 early_res[i].start = common_end;
101 return;
102 }
103 /* all covered */
104 drop_range(i);
105 }
106}
107
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108/*
109 * Split any existing ranges that:
110 * 1) are marked 'overlap_ok', and
111 * 2) overlap with the stated range [start, end)
112 * into whatever portion (if any) of the existing range is entirely
113 * below or entirely above the stated range. Drop the portion
114 * of the existing range that overlaps with the stated range,
115 * which will allow the caller of this routine to then add that
116 * stated range without conflicting with any existing range.
117 */
118static void __init drop_overlaps_that_are_ok(u64 start, u64 end)
119{
120 int i;
121 struct early_res *r;
122 u64 lower_start, lower_end;
123 u64 upper_start, upper_end;
124 char name[15];
125
126 for (i = 0; i < max_early_res && early_res[i].end; i++) {
127 r = &early_res[i];
128
129 /* Continue past non-overlapping ranges */
130 if (end <= r->start || start >= r->end)
131 continue;
132
133 /*
134 * Leave non-ok overlaps as is; let caller
135 * panic "Overlapping early reservations"
136 * when it hits this overlap.
137 */
138 if (!r->overlap_ok)
139 return;
140
141 /*
142 * We have an ok overlap. We will drop it from the early
143 * reservation map, and add back in any non-overlapping
144 * portions (lower or upper) as separate, overlap_ok,
145 * non-overlapping ranges.
146 */
147
148 /* 1. Note any non-overlapping (lower or upper) ranges. */
149 strncpy(name, r->name, sizeof(name) - 1);
150
151 lower_start = lower_end = 0;
152 upper_start = upper_end = 0;
153 if (r->start < start) {
154 lower_start = r->start;
155 lower_end = start;
156 }
157 if (r->end > end) {
158 upper_start = end;
159 upper_end = r->end;
160 }
161
162 /* 2. Drop the original ok overlapping range */
163 drop_range(i);
164
165 i--; /* resume for-loop on copied down entry */
166
167 /* 3. Add back in any non-overlapping ranges. */
168 if (lower_end)
169 reserve_early_overlap_ok(lower_start, lower_end, name);
170 if (upper_end)
171 reserve_early_overlap_ok(upper_start, upper_end, name);
172 }
173}
174
175static void __init __reserve_early(u64 start, u64 end, char *name,
176 int overlap_ok)
177{
178 int i;
179 struct early_res *r;
180
181 i = find_overlapped_early(start, end);
182 if (i >= max_early_res)
183 panic("Too many early reservations");
184 r = &early_res[i];
185 if (r->end)
186 panic("Overlapping early reservations "
187 "%llx-%llx %s to %llx-%llx %s\n",
188 start, end - 1, name ? name : "", r->start,
189 r->end - 1, r->name);
190 r->start = start;
191 r->end = end;
192 r->overlap_ok = overlap_ok;
193 if (name)
194 strncpy(r->name, name, sizeof(r->name) - 1);
195 early_res_count++;
196}
197
198/*
199 * A few early reservtations come here.
200 *
201 * The 'overlap_ok' in the name of this routine does -not- mean it
202 * is ok for these reservations to overlap an earlier reservation.
203 * Rather it means that it is ok for subsequent reservations to
204 * overlap this one.
205 *
206 * Use this entry point to reserve early ranges when you are doing
207 * so out of "Paranoia", reserving perhaps more memory than you need,
208 * just in case, and don't mind a subsequent overlapping reservation
209 * that is known to be needed.
210 *
211 * The drop_overlaps_that_are_ok() call here isn't really needed.
212 * It would be needed if we had two colliding 'overlap_ok'
213 * reservations, so that the second such would not panic on the
214 * overlap with the first. We don't have any such as of this
215 * writing, but might as well tolerate such if it happens in
216 * the future.
217 */
218void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
219{
220 drop_overlaps_that_are_ok(start, end);
221 __reserve_early(start, end, name, 1);
222}
223
53db62a2 224static void __init __check_and_double_early_res(u64 ex_start, u64 ex_end)
a678c2be 225{
53db62a2 226 u64 start, end, size, mem;
a678c2be
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227 struct early_res *new;
228
229 /* do we have enough slots left ? */
230 if ((max_early_res - early_res_count) > max(max_early_res/8, 2))
231 return;
232
233 /* double it */
53db62a2 234 mem = -1ULL;
a678c2be 235 size = sizeof(struct early_res) * max_early_res * 2;
53db62a2
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236 if (early_res == early_res_x)
237 start = 0;
238 else
239 start = early_res[0].end;
240 end = ex_start;
241 if (start + size < end)
dd645cee 242 mem = find_fw_memmap_area(start, end, size,
53db62a2
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243 sizeof(struct early_res));
244 if (mem == -1ULL) {
245 start = ex_end;
580e0ad2 246 end = get_max_mapped();
53db62a2 247 if (start + size < end)
dd645cee 248 mem = find_fw_memmap_area(start, end, size,
53db62a2
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249 sizeof(struct early_res));
250 }
a678c2be
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251 if (mem == -1ULL)
252 panic("can not find more space for early_res array");
253
254 new = __va(mem);
255 /* save the first one for own */
256 new[0].start = mem;
257 new[0].end = mem + size;
258 new[0].overlap_ok = 0;
259 /* copy old to new */
260 if (early_res == early_res_x) {
261 memcpy(&new[1], &early_res[0],
262 sizeof(struct early_res) * max_early_res);
263 memset(&new[max_early_res+1], 0,
264 sizeof(struct early_res) * (max_early_res - 1));
265 early_res_count++;
266 } else {
267 memcpy(&new[1], &early_res[1],
268 sizeof(struct early_res) * (max_early_res - 1));
269 memset(&new[max_early_res], 0,
270 sizeof(struct early_res) * max_early_res);
271 }
272 memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
273 early_res = new;
274 max_early_res *= 2;
275 printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n",
276 max_early_res, mem, mem + size - 1);
277}
278
279/*
280 * Most early reservations come here.
281 *
282 * We first have drop_overlaps_that_are_ok() drop any pre-existing
283 * 'overlap_ok' ranges, so that we can then reserve this memory
284 * range without risk of panic'ing on an overlapping overlap_ok
285 * early reservation.
286 */
287void __init reserve_early(u64 start, u64 end, char *name)
288{
289 if (start >= end)
290 return;
291
53db62a2 292 __check_and_double_early_res(start, end);
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293
294 drop_overlaps_that_are_ok(start, end);
295 __reserve_early(start, end, name, 0);
296}
297
298void __init reserve_early_without_check(u64 start, u64 end, char *name)
299{
300 struct early_res *r;
301
302 if (start >= end)
303 return;
304
53db62a2 305 __check_and_double_early_res(start, end);
a678c2be
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306
307 r = &early_res[early_res_count];
308
309 r->start = start;
310 r->end = end;
311 r->overlap_ok = 0;
312 if (name)
313 strncpy(r->name, name, sizeof(r->name) - 1);
314 early_res_count++;
315}
316
317void __init free_early(u64 start, u64 end)
318{
319 struct early_res *r;
320 int i;
321
322 i = find_overlapped_early(start, end);
323 r = &early_res[i];
324 if (i >= max_early_res || r->end != end || r->start != start)
325 panic("free_early on not reserved area: %llx-%llx!",
326 start, end - 1);
327
328 drop_range(i);
329}
330
fb90ef93
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331void __init free_early_partial(u64 start, u64 end)
332{
333 struct early_res *r;
334 int i;
335
336try_next:
337 i = find_overlapped_early(start, end);
338 if (i >= max_early_res)
339 return;
340
341 r = &early_res[i];
342 /* hole ? */
343 if (r->end >= end && r->start <= start) {
344 drop_range_partial(i, start, end);
345 return;
346 }
347
348 drop_range_partial(i, start, end);
349 goto try_next;
350}
351
a678c2be
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352#ifdef CONFIG_NO_BOOTMEM
353static void __init subtract_early_res(struct range *range, int az)
354{
355 int i, count;
356 u64 final_start, final_end;
357 int idx = 0;
358
359 count = 0;
360 for (i = 0; i < max_early_res && early_res[i].end; i++)
361 count++;
362
363 /* need to skip first one ?*/
364 if (early_res != early_res_x)
365 idx = 1;
366
367#define DEBUG_PRINT_EARLY_RES 1
368
369#if DEBUG_PRINT_EARLY_RES
370 printk(KERN_INFO "Subtract (%d early reservations)\n", count);
371#endif
372 for (i = idx; i < count; i++) {
373 struct early_res *r = &early_res[i];
374#if DEBUG_PRINT_EARLY_RES
375 printk(KERN_INFO " #%d [%010llx - %010llx] %15s\n", i,
376 r->start, r->end, r->name);
377#endif
378 final_start = PFN_DOWN(r->start);
379 final_end = PFN_UP(r->end);
380 if (final_start >= final_end)
381 continue;
382 subtract_range(range, az, final_start, final_end);
383 }
384
385}
386
387int __init get_free_all_memory_range(struct range **rangep, int nodeid)
388{
389 int i, count;
390 u64 start = 0, end;
391 u64 size;
392 u64 mem;
393 struct range *range;
394 int nr_range;
395
396 count = 0;
397 for (i = 0; i < max_early_res && early_res[i].end; i++)
398 count++;
399
400 count *= 2;
401
402 size = sizeof(struct range) * count;
580e0ad2 403 end = get_max_mapped();
a678c2be 404#ifdef MAX_DMA32_PFN
580e0ad2 405 if (end > (MAX_DMA32_PFN << PAGE_SHIFT))
a678c2be
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406 start = MAX_DMA32_PFN << PAGE_SHIFT;
407#endif
dd645cee 408 mem = find_fw_memmap_area(start, end, size, sizeof(struct range));
a678c2be
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409 if (mem == -1ULL)
410 panic("can not find more space for range free");
411
412 range = __va(mem);
413 /* use early_node_map[] and early_res to get range array at first */
414 memset(range, 0, size);
415 nr_range = 0;
416
417 /* need to go over early_node_map to find out good range for node */
418 nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
59be5a8e
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419#ifdef CONFIG_X86_32
420 subtract_range(range, count, max_low_pfn, -1ULL);
421#endif
a678c2be
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422 subtract_early_res(range, count);
423 nr_range = clean_sort_range(range, count);
424
425 /* need to clear it ? */
426 if (nodeid == MAX_NUMNODES) {
427 memset(&early_res[0], 0,
428 sizeof(struct early_res) * max_early_res);
429 early_res = NULL;
430 max_early_res = 0;
431 }
432
433 *rangep = range;
434 return nr_range;
435}
436#else
437void __init early_res_to_bootmem(u64 start, u64 end)
438{
439 int i, count;
440 u64 final_start, final_end;
441 int idx = 0;
442
443 count = 0;
444 for (i = 0; i < max_early_res && early_res[i].end; i++)
445 count++;
446
447 /* need to skip first one ?*/
448 if (early_res != early_res_x)
449 idx = 1;
450
451 printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n",
452 count - idx, max_early_res, start, end);
453 for (i = idx; i < count; i++) {
454 struct early_res *r = &early_res[i];
455 printk(KERN_INFO " #%d [%010llx - %010llx] %16s", i,
456 r->start, r->end, r->name);
457 final_start = max(start, r->start);
458 final_end = min(end, r->end);
459 if (final_start >= final_end) {
460 printk(KERN_CONT "\n");
461 continue;
462 }
463 printk(KERN_CONT " ==> [%010llx - %010llx]\n",
464 final_start, final_end);
465 reserve_bootmem_generic(final_start, final_end - final_start,
466 BOOTMEM_DEFAULT);
467 }
468 /* clear them */
469 memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
470 early_res = NULL;
471 max_early_res = 0;
472 early_res_count = 0;
473}
474#endif
475
476/* Check for already reserved areas */
477static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
478{
479 int i;
480 u64 addr = *addrp;
481 int changed = 0;
482 struct early_res *r;
483again:
484 i = find_overlapped_early(addr, addr + size);
485 r = &early_res[i];
486 if (i < max_early_res && r->end) {
487 *addrp = addr = round_up(r->end, align);
488 changed = 1;
489 goto again;
490 }
491 return changed;
492}
493
494/* Check for already reserved areas */
495static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
496{
497 int i;
498 u64 addr = *addrp, last;
499 u64 size = *sizep;
500 int changed = 0;
501again:
502 last = addr + size;
503 for (i = 0; i < max_early_res && early_res[i].end; i++) {
504 struct early_res *r = &early_res[i];
505 if (last > r->start && addr < r->start) {
506 size = r->start - addr;
507 changed = 1;
508 goto again;
509 }
510 if (last > r->end && addr < r->end) {
511 addr = round_up(r->end, align);
512 size = last - addr;
513 changed = 1;
514 goto again;
515 }
516 if (last <= r->end && addr >= r->start) {
517 (*sizep)++;
518 return 0;
519 }
520 }
521 if (changed) {
522 *addrp = addr;
523 *sizep = size;
524 }
525 return changed;
526}
527
528/*
529 * Find a free area with specified alignment in a specific range.
530 * only with the area.between start to end is active range from early_node_map
531 * so they are good as RAM
532 */
533u64 __init find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
534 u64 size, u64 align)
535{
536 u64 addr, last;
537
538 addr = round_up(ei_start, align);
539 if (addr < start)
540 addr = round_up(start, align);
541 if (addr >= ei_last)
542 goto out;
543 while (bad_addr(&addr, size, align) && addr+size <= ei_last)
544 ;
545 last = addr + size;
546 if (last > ei_last)
547 goto out;
548 if (last > end)
549 goto out;
550
551 return addr;
552
553out:
554 return -1ULL;
555}
556
7da657d1
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557u64 __init find_early_area_size(u64 ei_start, u64 ei_last, u64 start,
558 u64 *sizep, u64 align)
559{
560 u64 addr, last;
561
562 addr = round_up(ei_start, align);
563 if (addr < start)
564 addr = round_up(start, align);
565 if (addr >= ei_last)
566 goto out;
567 *sizep = ei_last - addr;
568 while (bad_addr_size(&addr, sizep, align) && addr + *sizep <= ei_last)
569 ;
570 last = addr + *sizep;
571 if (last > ei_last)
572 goto out;
573
574 return addr;
575
576out:
577 return -1ULL;
578}