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Merge commit 'gcl/next' into next
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / Documentation / vm / page-types.c
CommitLineData
35efa5e9
WF		 1/*
2 * page-types: Tool for querying page flags
3 *
4 * Copyright (C) 2009 Intel corporation
0c57effe
WF		 5 *
6 * Authors: Wu Fengguang <fengguang.wu@intel.com>
7 *
8 * Released under the General Public License (GPL).
35efa5e9
WF		 9 */
10
0b4b2ad5 11#define _LARGEFILE64_SOURCE
35efa5e9
WF		 12#include <stdio.h>
13#include <stdlib.h>
14#include <unistd.h>
15#include <stdint.h>
16#include <stdarg.h>
17#include <string.h>
18#include <getopt.h>
19#include <limits.h>
0b4b2ad5 20#include <assert.h>
35efa5e9
WF		 21#include <sys/types.h>
22#include <sys/errno.h>
23#include <sys/fcntl.h>
24
25
0b4b2ad5
WF		 26/*
27 * pagemap kernel ABI bits
28 */
29
30#define PM_ENTRY_BYTES sizeof(uint64_t)
31#define PM_STATUS_BITS 3
32#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
33#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
34#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
35#define PM_PSHIFT_BITS 6
36#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
37#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
38#define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
39#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
40#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
41
42#define PM_PRESENT PM_STATUS(4LL)
43#define PM_SWAP PM_STATUS(2LL)
44
45
35efa5e9
WF		 46/*
47 * kernel page flags
48 */
49
50#define KPF_BYTES 8
51#define PROC_KPAGEFLAGS "/proc/kpageflags"
52
53/* copied from kpageflags_read() */
54#define KPF_LOCKED 0
55#define KPF_ERROR 1
56#define KPF_REFERENCED 2
57#define KPF_UPTODATE 3
58#define KPF_DIRTY 4
59#define KPF_LRU 5
60#define KPF_ACTIVE 6
61#define KPF_SLAB 7
62#define KPF_WRITEBACK 8
63#define KPF_RECLAIM 9
64#define KPF_BUDDY 10
65
66/* [11-20] new additions in 2.6.31 */
67#define KPF_MMAP 11
68#define KPF_ANON 12
69#define KPF_SWAPCACHE 13
70#define KPF_SWAPBACKED 14
71#define KPF_COMPOUND_HEAD 15
72#define KPF_COMPOUND_TAIL 16
73#define KPF_HUGE 17
74#define KPF_UNEVICTABLE 18
253fb02d 75#define KPF_HWPOISON 19
35efa5e9 76#define KPF_NOPAGE 20
a1bbb5ec 77#define KPF_KSM 21
35efa5e9
WF		 78
79/* [32-] kernel hacking assistances */
80#define KPF_RESERVED 32
81#define KPF_MLOCKED 33
82#define KPF_MAPPEDTODISK 34
83#define KPF_PRIVATE 35
84#define KPF_PRIVATE_2 36
85#define KPF_OWNER_PRIVATE 37
86#define KPF_ARCH 38
87#define KPF_UNCACHED 39
88
89/* [48-] take some arbitrary free slots for expanding overloaded flags
90 * not part of kernel API
91 */
92#define KPF_READAHEAD 48
93#define KPF_SLOB_FREE 49
94#define KPF_SLUB_FROZEN 50
95#define KPF_SLUB_DEBUG 51
96
97#define KPF_ALL_BITS ((uint64_t)~0ULL)
98#define KPF_HACKERS_BITS (0xffffULL << 32)
99#define KPF_OVERLOADED_BITS (0xffffULL << 48)
100#define BIT(name) (1ULL << KPF_##name)
101#define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
102
103static char *page_flag_names[] = {
104 [KPF_LOCKED] = "L:locked",
105 [KPF_ERROR] = "E:error",
106 [KPF_REFERENCED] = "R:referenced",
107 [KPF_UPTODATE] = "U:uptodate",
108 [KPF_DIRTY] = "D:dirty",
109 [KPF_LRU] = "l:lru",
110 [KPF_ACTIVE] = "A:active",
111 [KPF_SLAB] = "S:slab",
112 [KPF_WRITEBACK] = "W:writeback",
113 [KPF_RECLAIM] = "I:reclaim",
114 [KPF_BUDDY] = "B:buddy",
115
116 [KPF_MMAP] = "M:mmap",
117 [KPF_ANON] = "a:anonymous",
118 [KPF_SWAPCACHE] = "s:swapcache",
119 [KPF_SWAPBACKED] = "b:swapbacked",
120 [KPF_COMPOUND_HEAD] = "H:compound_head",
121 [KPF_COMPOUND_TAIL] = "T:compound_tail",
122 [KPF_HUGE] = "G:huge",
123 [KPF_UNEVICTABLE] = "u:unevictable",
253fb02d 124 [KPF_HWPOISON] = "X:hwpoison",
35efa5e9 125 [KPF_NOPAGE] = "n:nopage",
a1bbb5ec 126 [KPF_KSM] = "x:ksm",
35efa5e9
WF		 127
128 [KPF_RESERVED] = "r:reserved",
129 [KPF_MLOCKED] = "m:mlocked",
130 [KPF_MAPPEDTODISK] = "d:mappedtodisk",
131 [KPF_PRIVATE] = "P:private",
132 [KPF_PRIVATE_2] = "p:private_2",
133 [KPF_OWNER_PRIVATE] = "O:owner_private",
134 [KPF_ARCH] = "h:arch",
135 [KPF_UNCACHED] = "c:uncached",
136
137 [KPF_READAHEAD] = "I:readahead",
138 [KPF_SLOB_FREE] = "P:slob_free",
139 [KPF_SLUB_FROZEN] = "A:slub_frozen",
140 [KPF_SLUB_DEBUG] = "E:slub_debug",
141};
142
143
144/*
145 * data structures
146 */
147
148static int opt_raw; /* for kernel developers */
149static int opt_list; /* list pages (in ranges) */
150static int opt_no_summary; /* don't show summary */
151static pid_t opt_pid; /* process to walk */
152
153#define MAX_ADDR_RANGES 1024
154static int nr_addr_ranges;
155static unsigned long opt_offset[MAX_ADDR_RANGES];
156static unsigned long opt_size[MAX_ADDR_RANGES];
157
0b4b2ad5
WF		 158#define MAX_VMAS 10240
159static int nr_vmas;
160static unsigned long pg_start[MAX_VMAS];
161static unsigned long pg_end[MAX_VMAS];
0b4b2ad5 162
35efa5e9
WF		 163#define MAX_BIT_FILTERS 64
164static int nr_bit_filters;
165static uint64_t opt_mask[MAX_BIT_FILTERS];
166static uint64_t opt_bits[MAX_BIT_FILTERS];
167
168static int page_size;
169
4a1b6726 170static int pagemap_fd;
35efa5e9 171static int kpageflags_fd;
35efa5e9 172
a54fed9f
WF		 173static int opt_hwpoison;
174static int opt_unpoison;
175
176static char *hwpoison_debug_fs = "/debug/hwpoison";
177static int hwpoison_inject_fd;
178static int hwpoison_forget_fd;
179
35efa5e9
WF		 180#define HASH_SHIFT 13
181#define HASH_SIZE (1 << HASH_SHIFT)
182#define HASH_MASK (HASH_SIZE - 1)
183#define HASH_KEY(flags) (flags & HASH_MASK)
184
185static unsigned long total_pages;
186static unsigned long nr_pages[HASH_SIZE];
187static uint64_t page_flags[HASH_SIZE];
188
189
190/*
191 * helper functions
192 */
193
194#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
195
196#define min_t(type, x, y) ({ \
197 type __min1 = (x); \
198 type __min2 = (y); \
199 __min1 < __min2 ? __min1 : __min2; })
200
0b4b2ad5
WF		 201#define max_t(type, x, y) ({ \
202 type __max1 = (x); \
203 type __max2 = (y); \
204 __max1 > __max2 ? __max1 : __max2; })
205
b7ed698c 206static unsigned long pages2mb(unsigned long pages)
35efa5e9
WF		 207{
208 return (pages * page_size) >> 20;
209}
210
b7ed698c 211static void fatal(const char *x, ...)
35efa5e9
WF		 212{
213 va_list ap;
214
215 va_start(ap, x);
216 vfprintf(stderr, x, ap);
217 va_end(ap);
218 exit(EXIT_FAILURE);
219}
220
1b98c00b 221static int checked_open(const char *pathname, int flags)
31bbf66e
WF		 222{
223 int fd = open(pathname, flags);
224
225 if (fd < 0) {
226 perror(pathname);
227 exit(EXIT_FAILURE);
228 }
229
230 return fd;
231}
232
4a1b6726
WF		 233/*
234 * pagemap/kpageflags routines
235 */
236
237static unsigned long do_u64_read(int fd, char *name,
238 uint64_t *buf,
239 unsigned long index,
240 unsigned long count)
241{
242 long bytes;
243
244 if (index > ULONG_MAX / 8)
245 fatal("index overflow: %lu\n", index);
246
247 if (lseek(fd, index * 8, SEEK_SET) < 0) {
248 perror(name);
249 exit(EXIT_FAILURE);
250 }
251
252 bytes = read(fd, buf, count * 8);
253 if (bytes < 0) {
254 perror(name);
255 exit(EXIT_FAILURE);
256 }
257 if (bytes % 8)
258 fatal("partial read: %lu bytes\n", bytes);
259
260 return bytes / 8;
261}
262
263static unsigned long kpageflags_read(uint64_t *buf,
264 unsigned long index,
265 unsigned long pages)
266{
267 return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
268}
269
270static unsigned long pagemap_read(uint64_t *buf,
271 unsigned long index,
272 unsigned long pages)
273{
274 return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
275}
276
277static unsigned long pagemap_pfn(uint64_t val)
278{
279 unsigned long pfn;
280
281 if (val & PM_PRESENT)
282 pfn = PM_PFRAME(val);
283 else
284 pfn = 0;
285
286 return pfn;
287}
288
35efa5e9
WF		 289
290/*
291 * page flag names
292 */
293
b7ed698c 294static char *page_flag_name(uint64_t flags)
35efa5e9
WF		 295{
296 static char buf[65];
297 int present;
298 int i, j;
299
300 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
301 present = (flags >> i) & 1;
302 if (!page_flag_names[i]) {
303 if (present)
304 fatal("unkown flag bit %d\n", i);
305 continue;
306 }
307 buf[j++] = present ? page_flag_names[i][0] : '_';
308 }
309
310 return buf;
311}
312
b7ed698c 313static char *page_flag_longname(uint64_t flags)
35efa5e9
WF		 314{
315 static char buf[1024];
316 int i, n;
317
318 for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
319 if (!page_flag_names[i])
320 continue;
321 if ((flags >> i) & 1)
322 n += snprintf(buf + n, sizeof(buf) - n, "%s,",
323 page_flag_names[i] + 2);
324 }
325 if (n)
326 n--;
327 buf[n] = '\0';
328
329 return buf;
330}
331
332
333/*
334 * page list and summary
335 */
336
e577ebde
WF		 337static void show_page_range(unsigned long voffset,
338 unsigned long offset, uint64_t flags)
35efa5e9
WF		 339{
340 static uint64_t flags0;
0b4b2ad5 341 static unsigned long voff;
35efa5e9
WF		 342 static unsigned long index;
343 static unsigned long count;
344
0b4b2ad5
WF		 345 if (flags == flags0 && offset == index + count &&
346 (!opt_pid || voffset == voff + count)) {
35efa5e9
WF		 347 count++;
348 return;
349 }
350
0b4b2ad5
WF		 351 if (count) {
352 if (opt_pid)
353 printf("%lx\t", voff);
354 printf("%lx\t%lx\t%s\n",
35efa5e9 355 index, count, page_flag_name(flags0));
0b4b2ad5 356 }
35efa5e9
WF		 357
358 flags0 = flags;
359 index = offset;
0b4b2ad5 360 voff = voffset;
35efa5e9
WF		 361 count = 1;
362}
363
e577ebde
WF		 364static void show_page(unsigned long voffset,
365 unsigned long offset, uint64_t flags)
35efa5e9 366{
0b4b2ad5
WF		 367 if (opt_pid)
368 printf("%lx\t", voffset);
369 printf("%lx\t%s\n", offset, page_flag_name(flags));
35efa5e9
WF		 370}
371
b7ed698c 372static void show_summary(void)
35efa5e9
WF		 373{
374 int i;
375
376 printf(" flags\tpage-count MB"
377 " symbolic-flags\t\t\tlong-symbolic-flags\n");
378
379 for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
380 if (nr_pages[i])
381 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
382 (unsigned long long)page_flags[i],
383 nr_pages[i],
384 pages2mb(nr_pages[i]),
385 page_flag_name(page_flags[i]),
386 page_flag_longname(page_flags[i]));
387 }
388
389 printf(" total\t%10lu %8lu\n",
390 total_pages, pages2mb(total_pages));
391}
392
393
394/*
395 * page flag filters
396 */
397
b7ed698c 398static int bit_mask_ok(uint64_t flags)
35efa5e9
WF		 399{
400 int i;
401
402 for (i = 0; i < nr_bit_filters; i++) {
403 if (opt_bits[i] == KPF_ALL_BITS) {
404 if ((flags & opt_mask[i]) == 0)
405 return 0;
406 } else {
407 if ((flags & opt_mask[i]) != opt_bits[i])
408 return 0;
409 }
410 }
411
412 return 1;
413}
414
b7ed698c 415static uint64_t expand_overloaded_flags(uint64_t flags)
35efa5e9
WF		 416{
417 /* SLOB/SLUB overload several page flags */
418 if (flags & BIT(SLAB)) {
419 if (flags & BIT(PRIVATE))
420 flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
421 if (flags & BIT(ACTIVE))
422 flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
423 if (flags & BIT(ERROR))
424 flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
425 }
426
427 /* PG_reclaim is overloaded as PG_readahead in the read path */
428 if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
429 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
430
431 return flags;
432}
433
b7ed698c 434static uint64_t well_known_flags(uint64_t flags)
35efa5e9
WF		 435{
436 /* hide flags intended only for kernel hacker */
437 flags &= ~KPF_HACKERS_BITS;
438
439 /* hide non-hugeTLB compound pages */
440 if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
441 flags &= ~BITS_COMPOUND;
442
443 return flags;
444}
445
48640d69
WF		 446static uint64_t kpageflags_flags(uint64_t flags)
447{
448 flags = expand_overloaded_flags(flags);
449
450 if (!opt_raw)
451 flags = well_known_flags(flags);
452
453 return flags;
454}
455
a54fed9f
WF		 456/*
457 * page actions
458 */
459
460static void prepare_hwpoison_fd(void)
461{
462 char buf[100];
463
464 if (opt_hwpoison && !hwpoison_inject_fd) {
465 sprintf(buf, "%s/corrupt-pfn", hwpoison_debug_fs);
466 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
467 }
468
469 if (opt_unpoison && !hwpoison_forget_fd) {
470 sprintf(buf, "%s/renew-pfn", hwpoison_debug_fs);
471 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
472 }
473}
474
475static int hwpoison_page(unsigned long offset)
476{
477 char buf[100];
478 int len;
479
480 len = sprintf(buf, "0x%lx\n", offset);
481 len = write(hwpoison_inject_fd, buf, len);
482 if (len < 0) {
483 perror("hwpoison inject");
484 return len;
485 }
486 return 0;
487}
488
489static int unpoison_page(unsigned long offset)
490{
491 char buf[100];
492 int len;
493
494 len = sprintf(buf, "0x%lx\n", offset);
495 len = write(hwpoison_forget_fd, buf, len);
496 if (len < 0) {
497 perror("hwpoison forget");
498 return len;
499 }
500 return 0;
501}
502
35efa5e9
WF		 503/*
504 * page frame walker
505 */
506
b7ed698c 507static int hash_slot(uint64_t flags)
35efa5e9
WF		 508{
509 int k = HASH_KEY(flags);
510 int i;
511
512 /* Explicitly reserve slot 0 for flags 0: the following logic
513 * cannot distinguish an unoccupied slot from slot (flags==0).
514 */
515 if (flags == 0)
516 return 0;
517
518 /* search through the remaining (HASH_SIZE-1) slots */
519 for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
520 if (!k || k >= ARRAY_SIZE(page_flags))
521 k = 1;
522 if (page_flags[k] == 0) {
523 page_flags[k] = flags;
524 return k;
525 }
526 if (page_flags[k] == flags)
527 return k;
528 }
529
530 fatal("hash table full: bump up HASH_SHIFT?\n");
531 exit(EXIT_FAILURE);
532}
533
e577ebde
WF		 534static void add_page(unsigned long voffset,
535 unsigned long offset, uint64_t flags)
35efa5e9 536{
48640d69 537 flags = kpageflags_flags(flags);
35efa5e9
WF		 538
539 if (!bit_mask_ok(flags))
540 return;
541
a54fed9f
WF		 542 if (opt_hwpoison)
543 hwpoison_page(offset);
544 if (opt_unpoison)
545 unpoison_page(offset);
546
35efa5e9 547 if (opt_list == 1)
e577ebde 548 show_page_range(voffset, offset, flags);
35efa5e9 549 else if (opt_list == 2)
e577ebde 550 show_page(voffset, offset, flags);
35efa5e9
WF		 551
552 nr_pages[hash_slot(flags)]++;
553 total_pages++;
554}
555
4a1b6726 556#define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
e577ebde
WF		 557static void walk_pfn(unsigned long voffset,
558 unsigned long index,
559 unsigned long count)
35efa5e9 560{
4a1b6726 561 uint64_t buf[KPAGEFLAGS_BATCH];
35efa5e9 562 unsigned long batch;
4a1b6726 563 unsigned long pages;
35efa5e9
WF		 564 unsigned long i;
565
35efa5e9 566 while (count) {
4a1b6726
WF		 567 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
568 pages = kpageflags_read(buf, index, batch);
569 if (pages == 0)
35efa5e9 570 break;
35efa5e9 571
4a1b6726 572 for (i = 0; i < pages; i++)
e577ebde 573 add_page(voffset + i, index + i, buf[i]);
35efa5e9 574
4a1b6726
WF		 575 index += pages;
576 count -= pages;
35efa5e9
WF		 577 }
578}
579
4a1b6726
WF		 580#define PAGEMAP_BATCH (64 << 10)
581static void walk_vma(unsigned long index, unsigned long count)
0b4b2ad5 582{
4a1b6726
WF		 583 uint64_t buf[PAGEMAP_BATCH];
584 unsigned long batch;
585 unsigned long pages;
586 unsigned long pfn;
587 unsigned long i;
0b4b2ad5 588
4a1b6726
WF		 589 while (count) {
590 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
591 pages = pagemap_read(buf, index, batch);
592 if (pages == 0)
593 break;
0b4b2ad5 594
4a1b6726
WF		 595 for (i = 0; i < pages; i++) {
596 pfn = pagemap_pfn(buf[i]);
4a1b6726 597 if (pfn)
e577ebde 598 walk_pfn(index + i, pfn, 1);
4a1b6726
WF		 599 }
600
601 index += pages;
602 count -= pages;
603 }
0b4b2ad5
WF		 604}
605
606static void walk_task(unsigned long index, unsigned long count)
607{
0b4b2ad5 608 const unsigned long end = index + count;
e577ebde
WF		 609 unsigned long start;
610 int i = 0;
0b4b2ad5
WF		 611
612 while (index < end) {
613
614 while (pg_end[i] <= index)
615 if (++i >= nr_vmas)
616 return;
617 if (pg_start[i] >= end)
618 return;
619
e577ebde
WF		 620 start = max_t(unsigned long, pg_start[i], index);
621 index = min_t(unsigned long, pg_end[i], end);
0b4b2ad5 622
e577ebde
WF		 623 assert(start < index);
624 walk_vma(start, index - start);
0b4b2ad5
WF		 625 }
626}
627
628static void add_addr_range(unsigned long offset, unsigned long size)
629{
630 if (nr_addr_ranges >= MAX_ADDR_RANGES)
631 fatal("too many addr ranges\n");
632
633 opt_offset[nr_addr_ranges] = offset;
634 opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
635 nr_addr_ranges++;
636}
637
b7ed698c 638static void walk_addr_ranges(void)
35efa5e9
WF		 639{
640 int i;
641
31bbf66e 642 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
35efa5e9
WF		 643
644 if (!nr_addr_ranges)
0b4b2ad5 645 add_addr_range(0, ULONG_MAX);
35efa5e9
WF		 646
647 for (i = 0; i < nr_addr_ranges; i++)
0b4b2ad5 648 if (!opt_pid)
e577ebde 649 walk_pfn(0, opt_offset[i], opt_size[i]);
0b4b2ad5
WF		 650 else
651 walk_task(opt_offset[i], opt_size[i]);
35efa5e9
WF		 652
653 close(kpageflags_fd);
654}
655
656
657/*
658 * user interface
659 */
660
b7ed698c 661static const char *page_flag_type(uint64_t flag)
35efa5e9
WF		 662{
663 if (flag & KPF_HACKERS_BITS)
664 return "(r)";
665 if (flag & KPF_OVERLOADED_BITS)
666 return "(o)";
667 return " ";
668}
669
b7ed698c 670static void usage(void)
35efa5e9
WF		 671{
672 int i, j;
673
674 printf(
675"page-types [options]\n"
676" -r|--raw Raw mode, for kernel developers\n"
677" -a|--addr addr-spec Walk a range of pages\n"
678" -b|--bits bits-spec Walk pages with specified bits\n"
35efa5e9 679" -p|--pid pid Walk process address space\n"
0b4b2ad5 680#if 0 /* planned features */
35efa5e9
WF		 681" -f|--file filename Walk file address space\n"
682#endif
683" -l|--list Show page details in ranges\n"
684" -L|--list-each Show page details one by one\n"
685" -N|--no-summary Don't show summay info\n"
a54fed9f
WF		 686" -X|--hwpoison hwpoison pages\n"
687" -x|--unpoison unpoison pages\n"
35efa5e9
WF		 688" -h|--help Show this usage message\n"
689"addr-spec:\n"
690" N one page at offset N (unit: pages)\n"
691" N+M pages range from N to N+M-1\n"
692" N,M pages range from N to M-1\n"
693" N, pages range from N to end\n"
0b4b2ad5 694" ,M pages range from 0 to M-1\n"
35efa5e9
WF		 695"bits-spec:\n"
696" bit1,bit2 (flags & (bit1|bit2)) != 0\n"
697" bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
698" bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
699" =bit1,bit2 flags == (bit1|bit2)\n"
700"bit-names:\n"
701 );
702
703 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
704 if (!page_flag_names[i])
705 continue;
706 printf("%16s%s", page_flag_names[i] + 2,
707 page_flag_type(1ULL << i));
708 if (++j > 3) {
709 j = 0;
710 putchar('\n');
711 }
712 }
713 printf("\n "
714 "(r) raw mode bits (o) overloaded bits\n");
715}
716
b7ed698c 717static unsigned long long parse_number(const char *str)
35efa5e9
WF		 718{
719 unsigned long long n;
720
721 n = strtoll(str, NULL, 0);
722
723 if (n == 0 && str[0] != '0')
724 fatal("invalid name or number: %s\n", str);
725
726 return n;
727}
728
b7ed698c 729static void parse_pid(const char *str)
35efa5e9 730{
0b4b2ad5
WF		 731 FILE *file;
732 char buf[5000];
733
35efa5e9 734 opt_pid = parse_number(str);
35efa5e9 735
0b4b2ad5 736 sprintf(buf, "/proc/%d/pagemap", opt_pid);
31bbf66e 737 pagemap_fd = checked_open(buf, O_RDONLY);
0b4b2ad5
WF		 738
739 sprintf(buf, "/proc/%d/maps", opt_pid);
740 file = fopen(buf, "r");
741 if (!file) {
742 perror(buf);
743 exit(EXIT_FAILURE);
744 }
745
746 while (fgets(buf, sizeof(buf), file) != NULL) {
747 unsigned long vm_start;
748 unsigned long vm_end;
749 unsigned long long pgoff;
750 int major, minor;
751 char r, w, x, s;
752 unsigned long ino;
753 int n;
754
755 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
756 &vm_start,
757 &vm_end,
758 &r, &w, &x, &s,
759 &pgoff,
760 &major, &minor,
761 &ino);
762 if (n < 10) {
763 fprintf(stderr, "unexpected line: %s\n", buf);
764 continue;
765 }
766 pg_start[nr_vmas] = vm_start / page_size;
767 pg_end[nr_vmas] = vm_end / page_size;
768 if (++nr_vmas >= MAX_VMAS) {
769 fprintf(stderr, "too many VMAs\n");
770 break;
771 }
772 }
773 fclose(file);
35efa5e9
WF		 774}
775
0b4b2ad5 776static void parse_file(const char *name)
35efa5e9 777{
35efa5e9
WF		 778}
779
b7ed698c 780static void parse_addr_range(const char *optarg)
35efa5e9
WF		 781{
782 unsigned long offset;
783 unsigned long size;
784 char *p;
785
786 p = strchr(optarg, ',');
787 if (!p)
788 p = strchr(optarg, '+');
789
790 if (p == optarg) {
791 offset = 0;
792 size = parse_number(p + 1);
793 } else if (p) {
794 offset = parse_number(optarg);
795 if (p[1] == '\0')
796 size = ULONG_MAX;
797 else {
798 size = parse_number(p + 1);
799 if (*p == ',') {
800 if (size < offset)
801 fatal("invalid range: %lu,%lu\n",
802 offset, size);
803 size -= offset;
804 }
805 }
806 } else {
807 offset = parse_number(optarg);
808 size = 1;
809 }
810
811 add_addr_range(offset, size);
812}
813
b7ed698c 814static void add_bits_filter(uint64_t mask, uint64_t bits)
35efa5e9
WF		 815{
816 if (nr_bit_filters >= MAX_BIT_FILTERS)
817 fatal("too much bit filters\n");
818
819 opt_mask[nr_bit_filters] = mask;
820 opt_bits[nr_bit_filters] = bits;
821 nr_bit_filters++;
822}
823
b7ed698c 824static uint64_t parse_flag_name(const char *str, int len)
35efa5e9
WF		 825{
826 int i;
827
828 if (!*str || !len)
829 return 0;
830
831 if (len <= 8 && !strncmp(str, "compound", len))
832 return BITS_COMPOUND;
833
834 for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
835 if (!page_flag_names[i])
836 continue;
837 if (!strncmp(str, page_flag_names[i] + 2, len))
838 return 1ULL << i;
839 }
840
841 return parse_number(str);
842}
843
b7ed698c 844static uint64_t parse_flag_names(const char *str, int all)
35efa5e9
WF		 845{
846 const char *p = str;
847 uint64_t flags = 0;
848
849 while (1) {
850 if (*p == ',' || *p == '=' || *p == '\0') {
851 if ((*str != '~') || (*str == '~' && all && *++str))
852 flags |= parse_flag_name(str, p - str);
853 if (*p != ',')
854 break;
855 str = p + 1;
856 }
857 p++;
858 }
859
860 return flags;
861}
862
b7ed698c 863static void parse_bits_mask(const char *optarg)
35efa5e9
WF		 864{
865 uint64_t mask;
866 uint64_t bits;
867 const char *p;
868
869 p = strchr(optarg, '=');
870 if (p == optarg) {
871 mask = KPF_ALL_BITS;
872 bits = parse_flag_names(p + 1, 0);
873 } else if (p) {
874 mask = parse_flag_names(optarg, 0);
875 bits = parse_flag_names(p + 1, 0);
876 } else if (strchr(optarg, '~')) {
877 mask = parse_flag_names(optarg, 1);
878 bits = parse_flag_names(optarg, 0);
879 } else {
880 mask = parse_flag_names(optarg, 0);
881 bits = KPF_ALL_BITS;
882 }
883
884 add_bits_filter(mask, bits);
885}
886
887
b7ed698c 888static struct option opts[] = {
35efa5e9
WF		 889 { "raw" , 0, NULL, 'r' },
890 { "pid" , 1, NULL, 'p' },
891 { "file" , 1, NULL, 'f' },
892 { "addr" , 1, NULL, 'a' },
893 { "bits" , 1, NULL, 'b' },
894 { "list" , 0, NULL, 'l' },
895 { "list-each" , 0, NULL, 'L' },
896 { "no-summary", 0, NULL, 'N' },
a54fed9f
WF		 897 { "hwpoison" , 0, NULL, 'X' },
898 { "unpoison" , 0, NULL, 'x' },
35efa5e9
WF		 899 { "help" , 0, NULL, 'h' },
900 { NULL , 0, NULL, 0 }
901};
902
903int main(int argc, char *argv[])
904{
905 int c;
906
907 page_size = getpagesize();
908
909 while ((c = getopt_long(argc, argv,
a54fed9f 910 "rp:f:a:b:lLNXxh", opts, NULL)) != -1) {
35efa5e9
WF		 911 switch (c) {
912 case 'r':
913 opt_raw = 1;
914 break;
915 case 'p':
916 parse_pid(optarg);
917 break;
918 case 'f':
919 parse_file(optarg);
920 break;
921 case 'a':
922 parse_addr_range(optarg);
923 break;
924 case 'b':
925 parse_bits_mask(optarg);
926 break;
927 case 'l':
928 opt_list = 1;
929 break;
930 case 'L':
931 opt_list = 2;
932 break;
933 case 'N':
934 opt_no_summary = 1;
935 break;
a54fed9f
WF		 936 case 'X':
937 opt_hwpoison = 1;
938 prepare_hwpoison_fd();
939 break;
940 case 'x':
941 opt_unpoison = 1;
942 prepare_hwpoison_fd();
943 break;
35efa5e9
WF		 944 case 'h':
945 usage();
946 exit(0);
947 default:
948 usage();
949 exit(1);
950 }
951 }
952
0b4b2ad5
WF		 953 if (opt_list && opt_pid)
954 printf("voffset\t");
35efa5e9 955 if (opt_list == 1)
0b4b2ad5 956 printf("offset\tlen\tflags\n");
35efa5e9
WF		 957 if (opt_list == 2)
958 printf("offset\tflags\n");
959
960 walk_addr_ranges();
961
962 if (opt_list == 1)
e577ebde 963 show_page_range(0, 0, 0); /* drain the buffer */
35efa5e9
WF		 964
965 if (opt_no_summary)
966 return 0;
967
968 if (opt_list)
969 printf("\n\n");
970
971 show_summary();
972
973 return 0;
974}
kernel source for telekom puls (alcatel/mediatek)