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Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
[mirror_ubuntu-bionic-kernel.git] / tools / vm / page-types.c
1 /*
2 * page-types: Tool for querying page flags
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should find a copy of v2 of the GNU General Public License somewhere on
14 * your Linux system; if not, write to the Free Software Foundation, Inc., 59
15 * Temple Place, Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Copyright (C) 2009 Intel corporation
18 *
19 * Authors: Wu Fengguang <fengguang.wu@intel.com>
20 */
21
22 #define _LARGEFILE64_SOURCE
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <unistd.h>
26 #include <stdint.h>
27 #include <stdarg.h>
28 #include <string.h>
29 #include <getopt.h>
30 #include <limits.h>
31 #include <assert.h>
32 #include <sys/types.h>
33 #include <sys/errno.h>
34 #include <sys/fcntl.h>
35 #include <sys/mount.h>
36 #include <sys/statfs.h>
37 #include "../../include/uapi/linux/magic.h"
38 #include "../../include/uapi/linux/kernel-page-flags.h"
39 #include <api/fs/debugfs.h>
40
41 #ifndef MAX_PATH
42 # define MAX_PATH 256
43 #endif
44
45 #ifndef STR
46 # define _STR(x) #x
47 # define STR(x) _STR(x)
48 #endif
49
50 /*
51 * pagemap kernel ABI bits
52 */
53
54 #define PM_ENTRY_BYTES sizeof(uint64_t)
55 #define PM_STATUS_BITS 3
56 #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
57 #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
58 #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
59 #define PM_PSHIFT_BITS 6
60 #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
61 #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
62 #define __PM_PSHIFT(x) (((uint64_t) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
63 #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
64 #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
65
66 #define __PM_SOFT_DIRTY (1LL)
67 #define PM_PRESENT PM_STATUS(4LL)
68 #define PM_SWAP PM_STATUS(2LL)
69 #define PM_SOFT_DIRTY __PM_PSHIFT(__PM_SOFT_DIRTY)
70
71
72 /*
73 * kernel page flags
74 */
75
76 #define KPF_BYTES 8
77 #define PROC_KPAGEFLAGS "/proc/kpageflags"
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 #define KPF_SOFTDIRTY 40
89
90 /* [48-] take some arbitrary free slots for expanding overloaded flags
91 * not part of kernel API
92 */
93 #define KPF_READAHEAD 48
94 #define KPF_SLOB_FREE 49
95 #define KPF_SLUB_FROZEN 50
96 #define KPF_SLUB_DEBUG 51
97
98 #define KPF_ALL_BITS ((uint64_t)~0ULL)
99 #define KPF_HACKERS_BITS (0xffffULL << 32)
100 #define KPF_OVERLOADED_BITS (0xffffULL << 48)
101 #define BIT(name) (1ULL << KPF_##name)
102 #define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
103
104 static const char * const page_flag_names[] = {
105 [KPF_LOCKED] = "L:locked",
106 [KPF_ERROR] = "E:error",
107 [KPF_REFERENCED] = "R:referenced",
108 [KPF_UPTODATE] = "U:uptodate",
109 [KPF_DIRTY] = "D:dirty",
110 [KPF_LRU] = "l:lru",
111 [KPF_ACTIVE] = "A:active",
112 [KPF_SLAB] = "S:slab",
113 [KPF_WRITEBACK] = "W:writeback",
114 [KPF_RECLAIM] = "I:reclaim",
115 [KPF_BUDDY] = "B:buddy",
116
117 [KPF_MMAP] = "M:mmap",
118 [KPF_ANON] = "a:anonymous",
119 [KPF_SWAPCACHE] = "s:swapcache",
120 [KPF_SWAPBACKED] = "b:swapbacked",
121 [KPF_COMPOUND_HEAD] = "H:compound_head",
122 [KPF_COMPOUND_TAIL] = "T:compound_tail",
123 [KPF_HUGE] = "G:huge",
124 [KPF_UNEVICTABLE] = "u:unevictable",
125 [KPF_HWPOISON] = "X:hwpoison",
126 [KPF_NOPAGE] = "n:nopage",
127 [KPF_KSM] = "x:ksm",
128 [KPF_THP] = "t:thp",
129
130 [KPF_RESERVED] = "r:reserved",
131 [KPF_MLOCKED] = "m:mlocked",
132 [KPF_MAPPEDTODISK] = "d:mappedtodisk",
133 [KPF_PRIVATE] = "P:private",
134 [KPF_PRIVATE_2] = "p:private_2",
135 [KPF_OWNER_PRIVATE] = "O:owner_private",
136 [KPF_ARCH] = "h:arch",
137 [KPF_UNCACHED] = "c:uncached",
138 [KPF_SOFTDIRTY] = "f:softdirty",
139
140 [KPF_READAHEAD] = "I:readahead",
141 [KPF_SLOB_FREE] = "P:slob_free",
142 [KPF_SLUB_FROZEN] = "A:slub_frozen",
143 [KPF_SLUB_DEBUG] = "E:slub_debug",
144 };
145
146
147 static const char * const debugfs_known_mountpoints[] = {
148 "/sys/kernel/debug",
149 "/debug",
150 0,
151 };
152
153 /*
154 * data structures
155 */
156
157 static int opt_raw; /* for kernel developers */
158 static int opt_list; /* list pages (in ranges) */
159 static int opt_no_summary; /* don't show summary */
160 static pid_t opt_pid; /* process to walk */
161
162 #define MAX_ADDR_RANGES 1024
163 static int nr_addr_ranges;
164 static unsigned long opt_offset[MAX_ADDR_RANGES];
165 static unsigned long opt_size[MAX_ADDR_RANGES];
166
167 #define MAX_VMAS 10240
168 static int nr_vmas;
169 static unsigned long pg_start[MAX_VMAS];
170 static unsigned long pg_end[MAX_VMAS];
171
172 #define MAX_BIT_FILTERS 64
173 static int nr_bit_filters;
174 static uint64_t opt_mask[MAX_BIT_FILTERS];
175 static uint64_t opt_bits[MAX_BIT_FILTERS];
176
177 static int page_size;
178
179 static int pagemap_fd;
180 static int kpageflags_fd;
181
182 static int opt_hwpoison;
183 static int opt_unpoison;
184
185 static char *hwpoison_debug_fs;
186 static int hwpoison_inject_fd;
187 static int hwpoison_forget_fd;
188
189 #define HASH_SHIFT 13
190 #define HASH_SIZE (1 << HASH_SHIFT)
191 #define HASH_MASK (HASH_SIZE - 1)
192 #define HASH_KEY(flags) (flags & HASH_MASK)
193
194 static unsigned long total_pages;
195 static unsigned long nr_pages[HASH_SIZE];
196 static uint64_t page_flags[HASH_SIZE];
197
198
199 /*
200 * helper functions
201 */
202
203 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
204
205 #define min_t(type, x, y) ({ \
206 type __min1 = (x); \
207 type __min2 = (y); \
208 __min1 < __min2 ? __min1 : __min2; })
209
210 #define max_t(type, x, y) ({ \
211 type __max1 = (x); \
212 type __max2 = (y); \
213 __max1 > __max2 ? __max1 : __max2; })
214
215 static unsigned long pages2mb(unsigned long pages)
216 {
217 return (pages * page_size) >> 20;
218 }
219
220 static void fatal(const char *x, ...)
221 {
222 va_list ap;
223
224 va_start(ap, x);
225 vfprintf(stderr, x, ap);
226 va_end(ap);
227 exit(EXIT_FAILURE);
228 }
229
230 static int checked_open(const char *pathname, int flags)
231 {
232 int fd = open(pathname, flags);
233
234 if (fd < 0) {
235 perror(pathname);
236 exit(EXIT_FAILURE);
237 }
238
239 return fd;
240 }
241
242 /*
243 * pagemap/kpageflags routines
244 */
245
246 static unsigned long do_u64_read(int fd, char *name,
247 uint64_t *buf,
248 unsigned long index,
249 unsigned long count)
250 {
251 long bytes;
252
253 if (index > ULONG_MAX / 8)
254 fatal("index overflow: %lu\n", index);
255
256 if (lseek(fd, index * 8, SEEK_SET) < 0) {
257 perror(name);
258 exit(EXIT_FAILURE);
259 }
260
261 bytes = read(fd, buf, count * 8);
262 if (bytes < 0) {
263 perror(name);
264 exit(EXIT_FAILURE);
265 }
266 if (bytes % 8)
267 fatal("partial read: %lu bytes\n", bytes);
268
269 return bytes / 8;
270 }
271
272 static unsigned long kpageflags_read(uint64_t *buf,
273 unsigned long index,
274 unsigned long pages)
275 {
276 return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
277 }
278
279 static unsigned long pagemap_read(uint64_t *buf,
280 unsigned long index,
281 unsigned long pages)
282 {
283 return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
284 }
285
286 static unsigned long pagemap_pfn(uint64_t val)
287 {
288 unsigned long pfn;
289
290 if (val & PM_PRESENT)
291 pfn = PM_PFRAME(val);
292 else
293 pfn = 0;
294
295 return pfn;
296 }
297
298
299 /*
300 * page flag names
301 */
302
303 static char *page_flag_name(uint64_t flags)
304 {
305 static char buf[65];
306 int present;
307 size_t i, j;
308
309 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
310 present = (flags >> i) & 1;
311 if (!page_flag_names[i]) {
312 if (present)
313 fatal("unknown flag bit %d\n", i);
314 continue;
315 }
316 buf[j++] = present ? page_flag_names[i][0] : '_';
317 }
318
319 return buf;
320 }
321
322 static char *page_flag_longname(uint64_t flags)
323 {
324 static char buf[1024];
325 size_t i, n;
326
327 for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
328 if (!page_flag_names[i])
329 continue;
330 if ((flags >> i) & 1)
331 n += snprintf(buf + n, sizeof(buf) - n, "%s,",
332 page_flag_names[i] + 2);
333 }
334 if (n)
335 n--;
336 buf[n] = '\0';
337
338 return buf;
339 }
340
341
342 /*
343 * page list and summary
344 */
345
346 static void show_page_range(unsigned long voffset,
347 unsigned long offset, uint64_t flags)
348 {
349 static uint64_t flags0;
350 static unsigned long voff;
351 static unsigned long index;
352 static unsigned long count;
353
354 if (flags == flags0 && offset == index + count &&
355 (!opt_pid || voffset == voff + count)) {
356 count++;
357 return;
358 }
359
360 if (count) {
361 if (opt_pid)
362 printf("%lx\t", voff);
363 printf("%lx\t%lx\t%s\n",
364 index, count, page_flag_name(flags0));
365 }
366
367 flags0 = flags;
368 index = offset;
369 voff = voffset;
370 count = 1;
371 }
372
373 static void show_page(unsigned long voffset,
374 unsigned long offset, uint64_t flags)
375 {
376 if (opt_pid)
377 printf("%lx\t", voffset);
378 printf("%lx\t%s\n", offset, page_flag_name(flags));
379 }
380
381 static void show_summary(void)
382 {
383 size_t i;
384
385 printf(" flags\tpage-count MB"
386 " symbolic-flags\t\t\tlong-symbolic-flags\n");
387
388 for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
389 if (nr_pages[i])
390 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
391 (unsigned long long)page_flags[i],
392 nr_pages[i],
393 pages2mb(nr_pages[i]),
394 page_flag_name(page_flags[i]),
395 page_flag_longname(page_flags[i]));
396 }
397
398 printf(" total\t%10lu %8lu\n",
399 total_pages, pages2mb(total_pages));
400 }
401
402
403 /*
404 * page flag filters
405 */
406
407 static int bit_mask_ok(uint64_t flags)
408 {
409 int i;
410
411 for (i = 0; i < nr_bit_filters; i++) {
412 if (opt_bits[i] == KPF_ALL_BITS) {
413 if ((flags & opt_mask[i]) == 0)
414 return 0;
415 } else {
416 if ((flags & opt_mask[i]) != opt_bits[i])
417 return 0;
418 }
419 }
420
421 return 1;
422 }
423
424 static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
425 {
426 /* SLOB/SLUB overload several page flags */
427 if (flags & BIT(SLAB)) {
428 if (flags & BIT(PRIVATE))
429 flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
430 if (flags & BIT(ACTIVE))
431 flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
432 if (flags & BIT(ERROR))
433 flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
434 }
435
436 /* PG_reclaim is overloaded as PG_readahead in the read path */
437 if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
438 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
439
440 if (pme & PM_SOFT_DIRTY)
441 flags |= BIT(SOFTDIRTY);
442
443 return flags;
444 }
445
446 static uint64_t well_known_flags(uint64_t flags)
447 {
448 /* hide flags intended only for kernel hacker */
449 flags &= ~KPF_HACKERS_BITS;
450
451 /* hide non-hugeTLB compound pages */
452 if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
453 flags &= ~BITS_COMPOUND;
454
455 return flags;
456 }
457
458 static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme)
459 {
460 if (opt_raw)
461 flags = expand_overloaded_flags(flags, pme);
462 else
463 flags = well_known_flags(flags);
464
465 return flags;
466 }
467
468 /*
469 * page actions
470 */
471
472 static void prepare_hwpoison_fd(void)
473 {
474 char buf[MAX_PATH + 1];
475
476 hwpoison_debug_fs = debugfs_mount(NULL);
477 if (!hwpoison_debug_fs) {
478 perror("mount debugfs");
479 exit(EXIT_FAILURE);
480 }
481
482 if (opt_hwpoison && !hwpoison_inject_fd) {
483 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
484 hwpoison_debug_fs);
485 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
486 }
487
488 if (opt_unpoison && !hwpoison_forget_fd) {
489 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
490 hwpoison_debug_fs);
491 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
492 }
493 }
494
495 static int hwpoison_page(unsigned long offset)
496 {
497 char buf[100];
498 int len;
499
500 len = sprintf(buf, "0x%lx\n", offset);
501 len = write(hwpoison_inject_fd, buf, len);
502 if (len < 0) {
503 perror("hwpoison inject");
504 return len;
505 }
506 return 0;
507 }
508
509 static int unpoison_page(unsigned long offset)
510 {
511 char buf[100];
512 int len;
513
514 len = sprintf(buf, "0x%lx\n", offset);
515 len = write(hwpoison_forget_fd, buf, len);
516 if (len < 0) {
517 perror("hwpoison forget");
518 return len;
519 }
520 return 0;
521 }
522
523 /*
524 * page frame walker
525 */
526
527 static size_t hash_slot(uint64_t flags)
528 {
529 size_t k = HASH_KEY(flags);
530 size_t i;
531
532 /* Explicitly reserve slot 0 for flags 0: the following logic
533 * cannot distinguish an unoccupied slot from slot (flags==0).
534 */
535 if (flags == 0)
536 return 0;
537
538 /* search through the remaining (HASH_SIZE-1) slots */
539 for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
540 if (!k || k >= ARRAY_SIZE(page_flags))
541 k = 1;
542 if (page_flags[k] == 0) {
543 page_flags[k] = flags;
544 return k;
545 }
546 if (page_flags[k] == flags)
547 return k;
548 }
549
550 fatal("hash table full: bump up HASH_SHIFT?\n");
551 exit(EXIT_FAILURE);
552 }
553
554 static void add_page(unsigned long voffset,
555 unsigned long offset, uint64_t flags, uint64_t pme)
556 {
557 flags = kpageflags_flags(flags, pme);
558
559 if (!bit_mask_ok(flags))
560 return;
561
562 if (opt_hwpoison)
563 hwpoison_page(offset);
564 if (opt_unpoison)
565 unpoison_page(offset);
566
567 if (opt_list == 1)
568 show_page_range(voffset, offset, flags);
569 else if (opt_list == 2)
570 show_page(voffset, offset, flags);
571
572 nr_pages[hash_slot(flags)]++;
573 total_pages++;
574 }
575
576 #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
577 static void walk_pfn(unsigned long voffset,
578 unsigned long index,
579 unsigned long count,
580 uint64_t pme)
581 {
582 uint64_t buf[KPAGEFLAGS_BATCH];
583 unsigned long batch;
584 unsigned long pages;
585 unsigned long i;
586
587 while (count) {
588 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
589 pages = kpageflags_read(buf, index, batch);
590 if (pages == 0)
591 break;
592
593 for (i = 0; i < pages; i++)
594 add_page(voffset + i, index + i, buf[i], pme);
595
596 index += pages;
597 count -= pages;
598 }
599 }
600
601 #define PAGEMAP_BATCH (64 << 10)
602 static void walk_vma(unsigned long index, unsigned long count)
603 {
604 uint64_t buf[PAGEMAP_BATCH];
605 unsigned long batch;
606 unsigned long pages;
607 unsigned long pfn;
608 unsigned long i;
609
610 while (count) {
611 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
612 pages = pagemap_read(buf, index, batch);
613 if (pages == 0)
614 break;
615
616 for (i = 0; i < pages; i++) {
617 pfn = pagemap_pfn(buf[i]);
618 if (pfn)
619 walk_pfn(index + i, pfn, 1, buf[i]);
620 }
621
622 index += pages;
623 count -= pages;
624 }
625 }
626
627 static void walk_task(unsigned long index, unsigned long count)
628 {
629 const unsigned long end = index + count;
630 unsigned long start;
631 int i = 0;
632
633 while (index < end) {
634
635 while (pg_end[i] <= index)
636 if (++i >= nr_vmas)
637 return;
638 if (pg_start[i] >= end)
639 return;
640
641 start = max_t(unsigned long, pg_start[i], index);
642 index = min_t(unsigned long, pg_end[i], end);
643
644 assert(start < index);
645 walk_vma(start, index - start);
646 }
647 }
648
649 static void add_addr_range(unsigned long offset, unsigned long size)
650 {
651 if (nr_addr_ranges >= MAX_ADDR_RANGES)
652 fatal("too many addr ranges\n");
653
654 opt_offset[nr_addr_ranges] = offset;
655 opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
656 nr_addr_ranges++;
657 }
658
659 static void walk_addr_ranges(void)
660 {
661 int i;
662
663 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
664
665 if (!nr_addr_ranges)
666 add_addr_range(0, ULONG_MAX);
667
668 for (i = 0; i < nr_addr_ranges; i++)
669 if (!opt_pid)
670 walk_pfn(0, opt_offset[i], opt_size[i], 0);
671 else
672 walk_task(opt_offset[i], opt_size[i]);
673
674 close(kpageflags_fd);
675 }
676
677
678 /*
679 * user interface
680 */
681
682 static const char *page_flag_type(uint64_t flag)
683 {
684 if (flag & KPF_HACKERS_BITS)
685 return "(r)";
686 if (flag & KPF_OVERLOADED_BITS)
687 return "(o)";
688 return " ";
689 }
690
691 static void usage(void)
692 {
693 size_t i, j;
694
695 printf(
696 "page-types [options]\n"
697 " -r|--raw Raw mode, for kernel developers\n"
698 " -d|--describe flags Describe flags\n"
699 " -a|--addr addr-spec Walk a range of pages\n"
700 " -b|--bits bits-spec Walk pages with specified bits\n"
701 " -p|--pid pid Walk process address space\n"
702 #if 0 /* planned features */
703 " -f|--file filename Walk file address space\n"
704 #endif
705 " -l|--list Show page details in ranges\n"
706 " -L|--list-each Show page details one by one\n"
707 " -N|--no-summary Don't show summary info\n"
708 " -X|--hwpoison hwpoison pages\n"
709 " -x|--unpoison unpoison pages\n"
710 " -h|--help Show this usage message\n"
711 "flags:\n"
712 " 0x10 bitfield format, e.g.\n"
713 " anon bit-name, e.g.\n"
714 " 0x10,anon comma-separated list, e.g.\n"
715 "addr-spec:\n"
716 " N one page at offset N (unit: pages)\n"
717 " N+M pages range from N to N+M-1\n"
718 " N,M pages range from N to M-1\n"
719 " N, pages range from N to end\n"
720 " ,M pages range from 0 to M-1\n"
721 "bits-spec:\n"
722 " bit1,bit2 (flags & (bit1|bit2)) != 0\n"
723 " bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
724 " bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
725 " =bit1,bit2 flags == (bit1|bit2)\n"
726 "bit-names:\n"
727 );
728
729 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
730 if (!page_flag_names[i])
731 continue;
732 printf("%16s%s", page_flag_names[i] + 2,
733 page_flag_type(1ULL << i));
734 if (++j > 3) {
735 j = 0;
736 putchar('\n');
737 }
738 }
739 printf("\n "
740 "(r) raw mode bits (o) overloaded bits\n");
741 }
742
743 static unsigned long long parse_number(const char *str)
744 {
745 unsigned long long n;
746
747 n = strtoll(str, NULL, 0);
748
749 if (n == 0 && str[0] != '0')
750 fatal("invalid name or number: %s\n", str);
751
752 return n;
753 }
754
755 static void parse_pid(const char *str)
756 {
757 FILE *file;
758 char buf[5000];
759
760 opt_pid = parse_number(str);
761
762 sprintf(buf, "/proc/%d/pagemap", opt_pid);
763 pagemap_fd = checked_open(buf, O_RDONLY);
764
765 sprintf(buf, "/proc/%d/maps", opt_pid);
766 file = fopen(buf, "r");
767 if (!file) {
768 perror(buf);
769 exit(EXIT_FAILURE);
770 }
771
772 while (fgets(buf, sizeof(buf), file) != NULL) {
773 unsigned long vm_start;
774 unsigned long vm_end;
775 unsigned long long pgoff;
776 int major, minor;
777 char r, w, x, s;
778 unsigned long ino;
779 int n;
780
781 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
782 &vm_start,
783 &vm_end,
784 &r, &w, &x, &s,
785 &pgoff,
786 &major, &minor,
787 &ino);
788 if (n < 10) {
789 fprintf(stderr, "unexpected line: %s\n", buf);
790 continue;
791 }
792 pg_start[nr_vmas] = vm_start / page_size;
793 pg_end[nr_vmas] = vm_end / page_size;
794 if (++nr_vmas >= MAX_VMAS) {
795 fprintf(stderr, "too many VMAs\n");
796 break;
797 }
798 }
799 fclose(file);
800 }
801
802 static void parse_file(const char *name)
803 {
804 }
805
806 static void parse_addr_range(const char *optarg)
807 {
808 unsigned long offset;
809 unsigned long size;
810 char *p;
811
812 p = strchr(optarg, ',');
813 if (!p)
814 p = strchr(optarg, '+');
815
816 if (p == optarg) {
817 offset = 0;
818 size = parse_number(p + 1);
819 } else if (p) {
820 offset = parse_number(optarg);
821 if (p[1] == '\0')
822 size = ULONG_MAX;
823 else {
824 size = parse_number(p + 1);
825 if (*p == ',') {
826 if (size < offset)
827 fatal("invalid range: %lu,%lu\n",
828 offset, size);
829 size -= offset;
830 }
831 }
832 } else {
833 offset = parse_number(optarg);
834 size = 1;
835 }
836
837 add_addr_range(offset, size);
838 }
839
840 static void add_bits_filter(uint64_t mask, uint64_t bits)
841 {
842 if (nr_bit_filters >= MAX_BIT_FILTERS)
843 fatal("too much bit filters\n");
844
845 opt_mask[nr_bit_filters] = mask;
846 opt_bits[nr_bit_filters] = bits;
847 nr_bit_filters++;
848 }
849
850 static uint64_t parse_flag_name(const char *str, int len)
851 {
852 size_t i;
853
854 if (!*str || !len)
855 return 0;
856
857 if (len <= 8 && !strncmp(str, "compound", len))
858 return BITS_COMPOUND;
859
860 for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
861 if (!page_flag_names[i])
862 continue;
863 if (!strncmp(str, page_flag_names[i] + 2, len))
864 return 1ULL << i;
865 }
866
867 return parse_number(str);
868 }
869
870 static uint64_t parse_flag_names(const char *str, int all)
871 {
872 const char *p = str;
873 uint64_t flags = 0;
874
875 while (1) {
876 if (*p == ',' || *p == '=' || *p == '\0') {
877 if ((*str != '~') || (*str == '~' && all && *++str))
878 flags |= parse_flag_name(str, p - str);
879 if (*p != ',')
880 break;
881 str = p + 1;
882 }
883 p++;
884 }
885
886 return flags;
887 }
888
889 static void parse_bits_mask(const char *optarg)
890 {
891 uint64_t mask;
892 uint64_t bits;
893 const char *p;
894
895 p = strchr(optarg, '=');
896 if (p == optarg) {
897 mask = KPF_ALL_BITS;
898 bits = parse_flag_names(p + 1, 0);
899 } else if (p) {
900 mask = parse_flag_names(optarg, 0);
901 bits = parse_flag_names(p + 1, 0);
902 } else if (strchr(optarg, '~')) {
903 mask = parse_flag_names(optarg, 1);
904 bits = parse_flag_names(optarg, 0);
905 } else {
906 mask = parse_flag_names(optarg, 0);
907 bits = KPF_ALL_BITS;
908 }
909
910 add_bits_filter(mask, bits);
911 }
912
913 static void describe_flags(const char *optarg)
914 {
915 uint64_t flags = parse_flag_names(optarg, 0);
916
917 printf("0x%016llx\t%s\t%s\n",
918 (unsigned long long)flags,
919 page_flag_name(flags),
920 page_flag_longname(flags));
921 }
922
923 static const struct option opts[] = {
924 { "raw" , 0, NULL, 'r' },
925 { "pid" , 1, NULL, 'p' },
926 { "file" , 1, NULL, 'f' },
927 { "addr" , 1, NULL, 'a' },
928 { "bits" , 1, NULL, 'b' },
929 { "describe" , 1, NULL, 'd' },
930 { "list" , 0, NULL, 'l' },
931 { "list-each" , 0, NULL, 'L' },
932 { "no-summary", 0, NULL, 'N' },
933 { "hwpoison" , 0, NULL, 'X' },
934 { "unpoison" , 0, NULL, 'x' },
935 { "help" , 0, NULL, 'h' },
936 { NULL , 0, NULL, 0 }
937 };
938
939 int main(int argc, char *argv[])
940 {
941 int c;
942
943 page_size = getpagesize();
944
945 while ((c = getopt_long(argc, argv,
946 "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
947 switch (c) {
948 case 'r':
949 opt_raw = 1;
950 break;
951 case 'p':
952 parse_pid(optarg);
953 break;
954 case 'f':
955 parse_file(optarg);
956 break;
957 case 'a':
958 parse_addr_range(optarg);
959 break;
960 case 'b':
961 parse_bits_mask(optarg);
962 break;
963 case 'd':
964 describe_flags(optarg);
965 exit(0);
966 case 'l':
967 opt_list = 1;
968 break;
969 case 'L':
970 opt_list = 2;
971 break;
972 case 'N':
973 opt_no_summary = 1;
974 break;
975 case 'X':
976 opt_hwpoison = 1;
977 prepare_hwpoison_fd();
978 break;
979 case 'x':
980 opt_unpoison = 1;
981 prepare_hwpoison_fd();
982 break;
983 case 'h':
984 usage();
985 exit(0);
986 default:
987 usage();
988 exit(1);
989 }
990 }
991
992 if (opt_list && opt_pid)
993 printf("voffset\t");
994 if (opt_list == 1)
995 printf("offset\tlen\tflags\n");
996 if (opt_list == 2)
997 printf("offset\tflags\n");
998
999 walk_addr_ranges();
1000
1001 if (opt_list == 1)
1002 show_page_range(0, 0, 0); /* drain the buffer */
1003
1004 if (opt_no_summary)
1005 return 0;
1006
1007 if (opt_list)
1008 printf("\n\n");
1009
1010 show_summary();
1011
1012 return 0;
1013 }
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