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-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/early_res.c590
2 files changed, 0 insertions, 591 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 0b72d1a74be0..4c19ebe9053c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -11,7 +11,6 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ 11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o \ 12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o \
13 async.o range.o 13 async.o range.o
14obj-$(CONFIG_HAVE_EARLY_RES) += early_res.o
15obj-y += groups.o 14obj-y += groups.o
16 15
17ifdef CONFIG_FUNCTION_TRACER 16ifdef CONFIG_FUNCTION_TRACER
diff --git a/kernel/early_res.c b/kernel/early_res.c
deleted file mode 100644
index 7bfae887f211..000000000000
--- a/kernel/early_res.c
+++ /dev/null
@@ -1,590 +0,0 @@
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>
9#include <linux/early_res.h>
10#include <linux/slab.h>
11#include <linux/kmemleak.h>
12
13/*
14 * Early reserved memory areas.
15 */
16/*
17 * need to make sure this one is bigger enough before
18 * find_fw_memmap_area could be used
19 */
20#define MAX_EARLY_RES_X 32
21
22struct early_res {
23 u64 start, end;
24 char name[15];
25 char overlap_ok;
26};
27static struct early_res early_res_x[MAX_EARLY_RES_X] __initdata;
28
29static int max_early_res __initdata = MAX_EARLY_RES_X;
30static struct early_res *early_res __initdata = &early_res_x[0];
31static int early_res_count __initdata;
32
33static int __init find_overlapped_early(u64 start, u64 end)
34{
35 int i;
36 struct early_res *r;
37
38 for (i = 0; i < max_early_res && early_res[i].end; i++) {
39 r = &early_res[i];
40 if (end > r->start && start < r->end)
41 break;
42 }
43
44 return i;
45}
46
47/*
48 * Drop the i-th range from the early reservation map,
49 * by copying any higher ranges down one over it, and
50 * clearing what had been the last slot.
51 */
52static void __init drop_range(int i)
53{
54 int j;
55
56 for (j = i + 1; j < max_early_res && early_res[j].end; j++)
57 ;
58
59 memmove(&early_res[i], &early_res[i + 1],
60 (j - 1 - i) * sizeof(struct early_res));
61
62 early_res[j - 1].end = 0;
63 early_res_count--;
64}
65
66static void __init drop_range_partial(int i, u64 start, u64 end)
67{
68 u64 common_start, common_end;
69 u64 old_start, old_end;
70
71 old_start = early_res[i].start;
72 old_end = early_res[i].end;
73 common_start = max(old_start, start);
74 common_end = min(old_end, end);
75
76 /* no overlap ? */
77 if (common_start >= common_end)
78 return;
79
80 if (old_start < common_start) {
81 /* make head segment */
82 early_res[i].end = common_start;
83 if (old_end > common_end) {
84 char name[15];
85
86 /*
87 * Save a local copy of the name, since the
88 * early_res array could get resized inside
89 * reserve_early_without_check() ->
90 * __check_and_double_early_res(), which would
91 * make the current name pointer invalid.
92 */
93 strncpy(name, early_res[i].name,
94 sizeof(early_res[i].name) - 1);
95 /* add another for left over on tail */
96 reserve_early_without_check(common_end, old_end, name);
97 }
98 return;
99 } else {
100 if (old_end > common_end) {
101 /* reuse the entry for tail left */
102 early_res[i].start = common_end;
103 return;
104 }
105 /* all covered */
106 drop_range(i);
107 }
108}
109
110/*
111 * Split any existing ranges that:
112 * 1) are marked 'overlap_ok', and
113 * 2) overlap with the stated range [start, end)
114 * into whatever portion (if any) of the existing range is entirely
115 * below or entirely above the stated range. Drop the portion
116 * of the existing range that overlaps with the stated range,
117 * which will allow the caller of this routine to then add that
118 * stated range without conflicting with any existing range.
119 */
120static void __init drop_overlaps_that_are_ok(u64 start, u64 end)
121{
122 int i;
123 struct early_res *r;
124 u64 lower_start, lower_end;
125 u64 upper_start, upper_end;
126 char name[15];
127
128 for (i = 0; i < max_early_res && early_res[i].end; i++) {
129 r = &early_res[i];
130
131 /* Continue past non-overlapping ranges */
132 if (end <= r->start || start >= r->end)
133 continue;
134
135 /*
136 * Leave non-ok overlaps as is; let caller
137 * panic "Overlapping early reservations"
138 * when it hits this overlap.
139 */
140 if (!r->overlap_ok)
141 return;
142
143 /*
144 * We have an ok overlap. We will drop it from the early
145 * reservation map, and add back in any non-overlapping
146 * portions (lower or upper) as separate, overlap_ok,
147 * non-overlapping ranges.
148 */
149
150 /* 1. Note any non-overlapping (lower or upper) ranges. */
151 strncpy(name, r->name, sizeof(name) - 1);
152
153 lower_start = lower_end = 0;
154 upper_start = upper_end = 0;
155 if (r->start < start) {
156 lower_start = r->start;
157 lower_end = start;
158 }
159 if (r->end > end) {
160 upper_start = end;
161 upper_end = r->end;
162 }
163
164 /* 2. Drop the original ok overlapping range */
165 drop_range(i);
166
167 i--; /* resume for-loop on copied down entry */
168
169 /* 3. Add back in any non-overlapping ranges. */
170 if (lower_end)
171 reserve_early_overlap_ok(lower_start, lower_end, name);
172 if (upper_end)
173 reserve_early_overlap_ok(upper_start, upper_end, name);
174 }
175}
176
177static void __init __reserve_early(u64 start, u64 end, char *name,
178 int overlap_ok)
179{
180 int i;
181 struct early_res *r;
182
183 i = find_overlapped_early(start, end);
184 if (i >= max_early_res)
185 panic("Too many early reservations");
186 r = &early_res[i];
187 if (r->end)
188 panic("Overlapping early reservations "
189 "%llx-%llx %s to %llx-%llx %s\n",
190 start, end - 1, name ? name : "", r->start,
191 r->end - 1, r->name);
192 r->start = start;
193 r->end = end;
194 r->overlap_ok = overlap_ok;
195 if (name)
196 strncpy(r->name, name, sizeof(r->name) - 1);
197 early_res_count++;
198}
199
200/*
201 * A few early reservtations come here.
202 *
203 * The 'overlap_ok' in the name of this routine does -not- mean it
204 * is ok for these reservations to overlap an earlier reservation.
205 * Rather it means that it is ok for subsequent reservations to
206 * overlap this one.
207 *
208 * Use this entry point to reserve early ranges when you are doing
209 * so out of "Paranoia", reserving perhaps more memory than you need,
210 * just in case, and don't mind a subsequent overlapping reservation
211 * that is known to be needed.
212 *
213 * The drop_overlaps_that_are_ok() call here isn't really needed.
214 * It would be needed if we had two colliding 'overlap_ok'
215 * reservations, so that the second such would not panic on the
216 * overlap with the first. We don't have any such as of this
217 * writing, but might as well tolerate such if it happens in
218 * the future.
219 */
220void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
221{
222 drop_overlaps_that_are_ok(start, end);
223 __reserve_early(start, end, name, 1);
224}
225
226static void __init __check_and_double_early_res(u64 ex_start, u64 ex_end)
227{
228 u64 start, end, size, mem;
229 struct early_res *new;
230
231 /* do we have enough slots left ? */
232 if ((max_early_res - early_res_count) > max(max_early_res/8, 2))
233 return;
234
235 /* double it */
236 mem = -1ULL;
237 size = sizeof(struct early_res) * max_early_res * 2;
238 if (early_res == early_res_x)
239 start = 0;
240 else
241 start = early_res[0].end;
242 end = ex_start;
243 if (start + size < end)
244 mem = find_fw_memmap_area(start, end, size,
245 sizeof(struct early_res));
246 if (mem == -1ULL) {
247 start = ex_end;
248 end = get_max_mapped();
249 if (start + size < end)
250 mem = find_fw_memmap_area(start, end, size,
251 sizeof(struct early_res));
252 }
253 if (mem == -1ULL)
254 panic("can not find more space for early_res array");
255
256 new = __va(mem);
257 /* save the first one for own */
258 new[0].start = mem;
259 new[0].end = mem + size;
260 new[0].overlap_ok = 0;
261 /* copy old to new */
262 if (early_res == early_res_x) {
263 memcpy(&new[1], &early_res[0],
264 sizeof(struct early_res) * max_early_res);
265 memset(&new[max_early_res+1], 0,
266 sizeof(struct early_res) * (max_early_res - 1));
267 early_res_count++;
268 } else {
269 memcpy(&new[1], &early_res[1],
270 sizeof(struct early_res) * (max_early_res - 1));
271 memset(&new[max_early_res], 0,
272 sizeof(struct early_res) * max_early_res);
273 }
274 memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
275 early_res = new;
276 max_early_res *= 2;
277 printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n",
278 max_early_res, mem, mem + size - 1);
279}
280
281/*
282 * Most early reservations come here.
283 *
284 * We first have drop_overlaps_that_are_ok() drop any pre-existing
285 * 'overlap_ok' ranges, so that we can then reserve this memory
286 * range without risk of panic'ing on an overlapping overlap_ok
287 * early reservation.
288 */
289void __init reserve_early(u64 start, u64 end, char *name)
290{
291 if (start >= end)
292 return;
293
294 __check_and_double_early_res(start, end);
295
296 drop_overlaps_that_are_ok(start, end);
297 __reserve_early(start, end, name, 0);
298}
299
300void __init reserve_early_without_check(u64 start, u64 end, char *name)
301{
302 struct early_res *r;
303
304 if (start >= end)
305 return;
306
307 __check_and_double_early_res(start, end);
308
309 r = &early_res[early_res_count];
310
311 r->start = start;
312 r->end = end;
313 r->overlap_ok = 0;
314 if (name)
315 strncpy(r->name, name, sizeof(r->name) - 1);
316 early_res_count++;
317}
318
319void __init free_early(u64 start, u64 end)
320{
321 struct early_res *r;
322 int i;
323
324 kmemleak_free_part(__va(start), end - start);
325
326 i = find_overlapped_early(start, end);
327 r = &early_res[i];
328 if (i >= max_early_res || r->end != end || r->start != start)
329 panic("free_early on not reserved area: %llx-%llx!",
330 start, end - 1);
331
332 drop_range(i);
333}
334
335void __init free_early_partial(u64 start, u64 end)
336{
337 struct early_res *r;
338 int i;
339
340 kmemleak_free_part(__va(start), end - start);
341
342 if (start == end)
343 return;
344
345 if (WARN_ONCE(start > end, " wrong range [%#llx, %#llx]\n", start, end))
346 return;
347
348try_next:
349 i = find_overlapped_early(start, end);
350 if (i >= max_early_res)
351 return;
352
353 r = &early_res[i];
354 /* hole ? */
355 if (r->end >= end && r->start <= start) {
356 drop_range_partial(i, start, end);
357 return;
358 }
359
360 drop_range_partial(i, start, end);
361 goto try_next;
362}
363
364#ifdef CONFIG_NO_BOOTMEM
365static void __init subtract_early_res(struct range *range, int az)
366{
367 int i, count;
368 u64 final_start, final_end;
369 int idx = 0;
370
371 count = 0;
372 for (i = 0; i < max_early_res && early_res[i].end; i++)
373 count++;
374
375 /* need to skip first one ?*/
376 if (early_res != early_res_x)
377 idx = 1;
378
379#define DEBUG_PRINT_EARLY_RES 1
380
381#if DEBUG_PRINT_EARLY_RES
382 printk(KERN_INFO "Subtract (%d early reservations)\n", count);
383#endif
384 for (i = idx; i < count; i++) {
385 struct early_res *r = &early_res[i];
386#if DEBUG_PRINT_EARLY_RES
387 printk(KERN_INFO " #%d [%010llx - %010llx] %15s\n", i,
388 r->start, r->end, r->name);
389#endif
390 final_start = PFN_DOWN(r->start);
391 final_end = PFN_UP(r->end);
392 if (final_start >= final_end)
393 continue;
394 subtract_range(range, az, final_start, final_end);
395 }
396
397}
398
399int __init get_free_all_memory_range(struct range **rangep, int nodeid)
400{
401 int i, count;
402 u64 start = 0, end;
403 u64 size;
404 u64 mem;
405 struct range *range;
406 int nr_range;
407
408 count = 0;
409 for (i = 0; i < max_early_res && early_res[i].end; i++)
410 count++;
411
412 count *= 2;
413
414 size = sizeof(struct range) * count;
415 end = get_max_mapped();
416#ifdef MAX_DMA32_PFN
417 if (end > (MAX_DMA32_PFN << PAGE_SHIFT))
418 start = MAX_DMA32_PFN << PAGE_SHIFT;
419#endif
420 mem = find_fw_memmap_area(start, end, size, sizeof(struct range));
421 if (mem == -1ULL)
422 panic("can not find more space for range free");
423
424 range = __va(mem);
425 /* use early_node_map[] and early_res to get range array at first */
426 memset(range, 0, size);
427 nr_range = 0;
428
429 /* need to go over early_node_map to find out good range for node */
430 nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
431#ifdef CONFIG_X86_32
432 subtract_range(range, count, max_low_pfn, -1ULL);
433#endif
434 subtract_early_res(range, count);
435 nr_range = clean_sort_range(range, count);
436
437 /* need to clear it ? */
438 if (nodeid == MAX_NUMNODES) {
439 memset(&early_res[0], 0,
440 sizeof(struct early_res) * max_early_res);
441 early_res = NULL;
442 max_early_res = 0;
443 }
444
445 *rangep = range;
446 return nr_range;
447}
448#else
449void __init early_res_to_bootmem(u64 start, u64 end)
450{
451 int i, count;
452 u64 final_start, final_end;
453 int idx = 0;
454
455 count = 0;
456 for (i = 0; i < max_early_res && early_res[i].end; i++)
457 count++;
458
459 /* need to skip first one ?*/
460 if (early_res != early_res_x)
461 idx = 1;
462
463 printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n",
464 count - idx, max_early_res, start, end);
465 for (i = idx; i < count; i++) {
466 struct early_res *r = &early_res[i];
467 printk(KERN_INFO " #%d [%010llx - %010llx] %16s", i,
468 r->start, r->end, r->name);
469 final_start = max(start, r->start);
470 final_end = min(end, r->end);
471 if (final_start >= final_end) {
472 printk(KERN_CONT "\n");
473 continue;
474 }
475 printk(KERN_CONT " ==> [%010llx - %010llx]\n",
476 final_start, final_end);
477 reserve_bootmem_generic(final_start, final_end - final_start,
478 BOOTMEM_DEFAULT);
479 }
480 /* clear them */
481 memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
482 early_res = NULL;
483 max_early_res = 0;
484 early_res_count = 0;
485}
486#endif
487
488/* Check for already reserved areas */
489static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
490{
491 int i;
492 u64 addr = *addrp;
493 int changed = 0;
494 struct early_res *r;
495again:
496 i = find_overlapped_early(addr, addr + size);
497 r = &early_res[i];
498 if (i < max_early_res && r->end) {
499 *addrp = addr = round_up(r->end, align);
500 changed = 1;
501 goto again;
502 }
503 return changed;
504}
505
506/* Check for already reserved areas */
507static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
508{
509 int i;
510 u64 addr = *addrp, last;
511 u64 size = *sizep;
512 int changed = 0;
513again:
514 last = addr + size;
515 for (i = 0; i < max_early_res && early_res[i].end; i++) {
516 struct early_res *r = &early_res[i];
517 if (last > r->start && addr < r->start) {
518 size = r->start - addr;
519 changed = 1;
520 goto again;
521 }
522 if (last > r->end && addr < r->end) {
523 addr = round_up(r->end, align);
524 size = last - addr;
525 changed = 1;
526 goto again;
527 }
528 if (last <= r->end && addr >= r->start) {
529 (*sizep)++;
530 return 0;
531 }
532 }
533 if (changed) {
534 *addrp = addr;
535 *sizep = size;
536 }
537 return changed;
538}
539
540/*
541 * Find a free area with specified alignment in a specific range.
542 * only with the area.between start to end is active range from early_node_map
543 * so they are good as RAM
544 */
545u64 __init find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
546 u64 size, u64 align)
547{
548 u64 addr, last;
549
550 addr = round_up(ei_start, align);
551 if (addr < start)
552 addr = round_up(start, align);
553 if (addr >= ei_last)
554 goto out;
555 while (bad_addr(&addr, size, align) && addr+size <= ei_last)
556 ;
557 last = addr + size;
558 if (last > ei_last)
559 goto out;
560 if (last > end)
561 goto out;
562
563 return addr;
564
565out:
566 return -1ULL;
567}
568
569u64 __init find_early_area_size(u64 ei_start, u64 ei_last, u64 start,
570 u64 *sizep, u64 align)
571{
572 u64 addr, last;
573
574 addr = round_up(ei_start, align);
575 if (addr < start)
576 addr = round_up(start, align);
577 if (addr >= ei_last)
578 goto out;
579 *sizep = ei_last - addr;
580 while (bad_addr_size(&addr, sizep, align) && addr + *sizep <= ei_last)
581 ;
582 last = addr + *sizep;
583 if (last > ei_last)
584 goto out;
585
586 return addr;
587
588out:
589 return -1ULL;
590}
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