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Merge tag 'staging-3.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[linux-2.6.git] / tools / vm / page-types.c
blob71c9c2511ee71eef150f8d8da86dd10713b84e9f
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 <lk/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) (((u64) (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_PRESENT PM_STATUS(4LL)
67 #define PM_SWAP PM_STATUS(2LL)
68
69
70 /*
71 * kernel page flags
72 */
73
74 #define KPF_BYTES 8
75 #define PROC_KPAGEFLAGS "/proc/kpageflags"
76
77 /* [32-] kernel hacking assistances */
78 #define KPF_RESERVED 32
79 #define KPF_MLOCKED 33
80 #define KPF_MAPPEDTODISK 34
81 #define KPF_PRIVATE 35
82 #define KPF_PRIVATE_2 36
83 #define KPF_OWNER_PRIVATE 37
84 #define KPF_ARCH 38
85 #define KPF_UNCACHED 39
86
87 /* [48-] take some arbitrary free slots for expanding overloaded flags
88 * not part of kernel API
89 */
90 #define KPF_READAHEAD 48
91 #define KPF_SLOB_FREE 49
92 #define KPF_SLUB_FROZEN 50
93 #define KPF_SLUB_DEBUG 51
94
95 #define KPF_ALL_BITS ((uint64_t)~0ULL)
96 #define KPF_HACKERS_BITS (0xffffULL << 32)
97 #define KPF_OVERLOADED_BITS (0xffffULL << 48)
98 #define BIT(name) (1ULL << KPF_##name)
99 #define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
100
101 static const char * const page_flag_names[] = {
102 [KPF_LOCKED] = "L:locked",
103 [KPF_ERROR] = "E:error",
104 [KPF_REFERENCED] = "R:referenced",
105 [KPF_UPTODATE] = "U:uptodate",
106 [KPF_DIRTY] = "D:dirty",
107 [KPF_LRU] = "l:lru",
108 [KPF_ACTIVE] = "A:active",
109 [KPF_SLAB] = "S:slab",
110 [KPF_WRITEBACK] = "W:writeback",
111 [KPF_RECLAIM] = "I:reclaim",
112 [KPF_BUDDY] = "B:buddy",
113
114 [KPF_MMAP] = "M:mmap",
115 [KPF_ANON] = "a:anonymous",
116 [KPF_SWAPCACHE] = "s:swapcache",
117 [KPF_SWAPBACKED] = "b:swapbacked",
118 [KPF_COMPOUND_HEAD] = "H:compound_head",
119 [KPF_COMPOUND_TAIL] = "T:compound_tail",
120 [KPF_HUGE] = "G:huge",
121 [KPF_UNEVICTABLE] = "u:unevictable",
122 [KPF_HWPOISON] = "X:hwpoison",
123 [KPF_NOPAGE] = "n:nopage",
124 [KPF_KSM] = "x:ksm",
125 [KPF_THP] = "t:thp",
126
127 [KPF_RESERVED] = "r:reserved",
128 [KPF_MLOCKED] = "m:mlocked",
129 [KPF_MAPPEDTODISK] = "d:mappedtodisk",
130 [KPF_PRIVATE] = "P:private",
131 [KPF_PRIVATE_2] = "p:private_2",
132 [KPF_OWNER_PRIVATE] = "O:owner_private",
133 [KPF_ARCH] = "h:arch",
134 [KPF_UNCACHED] = "c:uncached",
135
136 [KPF_READAHEAD] = "I:readahead",
137 [KPF_SLOB_FREE] = "P:slob_free",
138 [KPF_SLUB_FROZEN] = "A:slub_frozen",
139 [KPF_SLUB_DEBUG] = "E:slub_debug",
140 };
141
142
143 static const char * const debugfs_known_mountpoints[] = {
144 "/sys/kernel/debug",
145 "/debug",
146 0,
147 };
148
149 /*
150 * data structures
151 */
152
153 static int opt_raw; /* for kernel developers */
154 static int opt_list; /* list pages (in ranges) */
155 static int opt_no_summary; /* don't show summary */
156 static pid_t opt_pid; /* process to walk */
157
158 #define MAX_ADDR_RANGES 1024
159 static int nr_addr_ranges;
160 static unsigned long opt_offset[MAX_ADDR_RANGES];
161 static unsigned long opt_size[MAX_ADDR_RANGES];
162
163 #define MAX_VMAS 10240
164 static int nr_vmas;
165 static unsigned long pg_start[MAX_VMAS];
166 static unsigned long pg_end[MAX_VMAS];
167
168 #define MAX_BIT_FILTERS 64
169 static int nr_bit_filters;
170 static uint64_t opt_mask[MAX_BIT_FILTERS];
171 static uint64_t opt_bits[MAX_BIT_FILTERS];
172
173 static int page_size;
174
175 static int pagemap_fd;
176 static int kpageflags_fd;
177
178 static int opt_hwpoison;
179 static int opt_unpoison;
180
181 static char *hwpoison_debug_fs;
182 static int hwpoison_inject_fd;
183 static int hwpoison_forget_fd;
184
185 #define HASH_SHIFT 13
186 #define HASH_SIZE (1 << HASH_SHIFT)
187 #define HASH_MASK (HASH_SIZE - 1)
188 #define HASH_KEY(flags) (flags & HASH_MASK)
189
190 static unsigned long total_pages;
191 static unsigned long nr_pages[HASH_SIZE];
192 static uint64_t page_flags[HASH_SIZE];
193
194
195 /*
196 * helper functions
197 */
198
199 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
200
201 #define min_t(type, x, y) ({ \
202 type __min1 = (x); \
203 type __min2 = (y); \
204 __min1 < __min2 ? __min1 : __min2; })
205
206 #define max_t(type, x, y) ({ \
207 type __max1 = (x); \
208 type __max2 = (y); \
209 __max1 > __max2 ? __max1 : __max2; })
210
211 static unsigned long pages2mb(unsigned long pages)
212 {
213 return (pages * page_size) >> 20;
214 }
215
216 static void fatal(const char *x, ...)
217 {
218 va_list ap;
219
220 va_start(ap, x);
221 vfprintf(stderr, x, ap);
222 va_end(ap);
223 exit(EXIT_FAILURE);
224 }
225
226 static int checked_open(const char *pathname, int flags)
227 {
228 int fd = open(pathname, flags);
229
230 if (fd < 0) {
231 perror(pathname);
232 exit(EXIT_FAILURE);
233 }
234
235 return fd;
236 }
237
238 /*
239 * pagemap/kpageflags routines
240 */
241
242 static unsigned long do_u64_read(int fd, char *name,
243 uint64_t *buf,
244 unsigned long index,
245 unsigned long count)
246 {
247 long bytes;
248
249 if (index > ULONG_MAX / 8)
250 fatal("index overflow: %lu\n", index);
251
252 if (lseek(fd, index * 8, SEEK_SET) < 0) {
253 perror(name);
254 exit(EXIT_FAILURE);
255 }
256
257 bytes = read(fd, buf, count * 8);
258 if (bytes < 0) {
259 perror(name);
260 exit(EXIT_FAILURE);
261 }
262 if (bytes % 8)
263 fatal("partial read: %lu bytes\n", bytes);
264
265 return bytes / 8;
266 }
267
268 static unsigned long kpageflags_read(uint64_t *buf,
269 unsigned long index,
270 unsigned long pages)
271 {
272 return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
273 }
274
275 static unsigned long pagemap_read(uint64_t *buf,
276 unsigned long index,
277 unsigned long pages)
278 {
279 return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
280 }
281
282 static unsigned long pagemap_pfn(uint64_t val)
283 {
284 unsigned long pfn;
285
286 if (val & PM_PRESENT)
287 pfn = PM_PFRAME(val);
288 else
289 pfn = 0;
290
291 return pfn;
292 }
293
294
295 /*
296 * page flag names
297 */
298
299 static char *page_flag_name(uint64_t flags)
300 {
301 static char buf[65];
302 int present;
303 size_t i, j;
304
305 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
306 present = (flags >> i) & 1;
307 if (!page_flag_names[i]) {
308 if (present)
309 fatal("unknown flag bit %d\n", i);
310 continue;
311 }
312 buf[j++] = present ? page_flag_names[i][0] : '_';
313 }
314
315 return buf;
316 }
317
318 static char *page_flag_longname(uint64_t flags)
319 {
320 static char buf[1024];
321 size_t i, n;
322
323 for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
324 if (!page_flag_names[i])
325 continue;
326 if ((flags >> i) & 1)
327 n += snprintf(buf + n, sizeof(buf) - n, "%s,",
328 page_flag_names[i] + 2);
329 }
330 if (n)
331 n--;
332 buf[n] = '\0';
333
334 return buf;
335 }
336
337
338 /*
339 * page list and summary
340 */
341
342 static void show_page_range(unsigned long voffset,
343 unsigned long offset, uint64_t flags)
344 {
345 static uint64_t flags0;
346 static unsigned long voff;
347 static unsigned long index;
348 static unsigned long count;
349
350 if (flags == flags0 && offset == index + count &&
351 (!opt_pid || voffset == voff + count)) {
352 count++;
353 return;
354 }
355
356 if (count) {
357 if (opt_pid)
358 printf("%lx\t", voff);
359 printf("%lx\t%lx\t%s\n",
360 index, count, page_flag_name(flags0));
361 }
362
363 flags0 = flags;
364 index = offset;
365 voff = voffset;
366 count = 1;
367 }
368
369 static void show_page(unsigned long voffset,
370 unsigned long offset, uint64_t flags)
371 {
372 if (opt_pid)
373 printf("%lx\t", voffset);
374 printf("%lx\t%s\n", offset, page_flag_name(flags));
375 }
376
377 static void show_summary(void)
378 {
379 size_t i;
380
381 printf(" flags\tpage-count MB"
382 " symbolic-flags\t\t\tlong-symbolic-flags\n");
383
384 for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
385 if (nr_pages[i])
386 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
387 (unsigned long long)page_flags[i],
388 nr_pages[i],
389 pages2mb(nr_pages[i]),
390 page_flag_name(page_flags[i]),
391 page_flag_longname(page_flags[i]));
392 }
393
394 printf(" total\t%10lu %8lu\n",
395 total_pages, pages2mb(total_pages));
396 }
397
398
399 /*
400 * page flag filters
401 */
402
403 static int bit_mask_ok(uint64_t flags)
404 {
405 int i;
406
407 for (i = 0; i < nr_bit_filters; i++) {
408 if (opt_bits[i] == KPF_ALL_BITS) {
409 if ((flags & opt_mask[i]) == 0)
410 return 0;
411 } else {
412 if ((flags & opt_mask[i]) != opt_bits[i])
413 return 0;
414 }
415 }
416
417 return 1;
418 }
419
420 static uint64_t expand_overloaded_flags(uint64_t flags)
421 {
422 /* SLOB/SLUB overload several page flags */
423 if (flags & BIT(SLAB)) {
424 if (flags & BIT(PRIVATE))
425 flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
426 if (flags & BIT(ACTIVE))
427 flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
428 if (flags & BIT(ERROR))
429 flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
430 }
431
432 /* PG_reclaim is overloaded as PG_readahead in the read path */
433 if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
434 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
435
436 return flags;
437 }
438
439 static uint64_t well_known_flags(uint64_t flags)
440 {
441 /* hide flags intended only for kernel hacker */
442 flags &= ~KPF_HACKERS_BITS;
443
444 /* hide non-hugeTLB compound pages */
445 if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
446 flags &= ~BITS_COMPOUND;
447
448 return flags;
449 }
450
451 static uint64_t kpageflags_flags(uint64_t flags)
452 {
453 flags = expand_overloaded_flags(flags);
454
455 if (!opt_raw)
456 flags = well_known_flags(flags);
457
458 return flags;
459 }
460
461 /*
462 * page actions
463 */
464
465 static void prepare_hwpoison_fd(void)
466 {
467 char buf[MAX_PATH + 1];
468
469 hwpoison_debug_fs = debugfs_mount(NULL);
470 if (!hwpoison_debug_fs) {
471 perror("mount debugfs");
472 exit(EXIT_FAILURE);
473 }
474
475 if (opt_hwpoison && !hwpoison_inject_fd) {
476 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
477 hwpoison_debug_fs);
478 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
479 }
480
481 if (opt_unpoison && !hwpoison_forget_fd) {
482 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
483 hwpoison_debug_fs);
484 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
485 }
486 }
487
488 static int hwpoison_page(unsigned long offset)
489 {
490 char buf[100];
491 int len;
492
493 len = sprintf(buf, "0x%lx\n", offset);
494 len = write(hwpoison_inject_fd, buf, len);
495 if (len < 0) {
496 perror("hwpoison inject");
497 return len;
498 }
499 return 0;
500 }
501
502 static int unpoison_page(unsigned long offset)
503 {
504 char buf[100];
505 int len;
506
507 len = sprintf(buf, "0x%lx\n", offset);
508 len = write(hwpoison_forget_fd, buf, len);
509 if (len < 0) {
510 perror("hwpoison forget");
511 return len;
512 }
513 return 0;
514 }
515
516 /*
517 * page frame walker
518 */
519
520 static size_t hash_slot(uint64_t flags)
521 {
522 size_t k = HASH_KEY(flags);
523 size_t i;
524
525 /* Explicitly reserve slot 0 for flags 0: the following logic
526 * cannot distinguish an unoccupied slot from slot (flags==0).
527 */
528 if (flags == 0)
529 return 0;
530
531 /* search through the remaining (HASH_SIZE-1) slots */
532 for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
533 if (!k || k >= ARRAY_SIZE(page_flags))
534 k = 1;
535 if (page_flags[k] == 0) {
536 page_flags[k] = flags;
537 return k;
538 }
539 if (page_flags[k] == flags)
540 return k;
541 }
542
543 fatal("hash table full: bump up HASH_SHIFT?\n");
544 exit(EXIT_FAILURE);
545 }
546
547 static void add_page(unsigned long voffset,
548 unsigned long offset, uint64_t flags)
549 {
550 flags = kpageflags_flags(flags);
551
552 if (!bit_mask_ok(flags))
553 return;
554
555 if (opt_hwpoison)
556 hwpoison_page(offset);
557 if (opt_unpoison)
558 unpoison_page(offset);
559
560 if (opt_list == 1)
561 show_page_range(voffset, offset, flags);
562 else if (opt_list == 2)
563 show_page(voffset, offset, flags);
564
565 nr_pages[hash_slot(flags)]++;
566 total_pages++;
567 }
568
569 #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
570 static void walk_pfn(unsigned long voffset,
571 unsigned long index,
572 unsigned long count)
573 {
574 uint64_t buf[KPAGEFLAGS_BATCH];
575 unsigned long batch;
576 unsigned long pages;
577 unsigned long i;
578
579 while (count) {
580 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
581 pages = kpageflags_read(buf, index, batch);
582 if (pages == 0)
583 break;
584
585 for (i = 0; i < pages; i++)
586 add_page(voffset + i, index + i, buf[i]);
587
588 index += pages;
589 count -= pages;
590 }
591 }
592
593 #define PAGEMAP_BATCH (64 << 10)
594 static void walk_vma(unsigned long index, unsigned long count)
595 {
596 uint64_t buf[PAGEMAP_BATCH];
597 unsigned long batch;
598 unsigned long pages;
599 unsigned long pfn;
600 unsigned long i;
601
602 while (count) {
603 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
604 pages = pagemap_read(buf, index, batch);
605 if (pages == 0)
606 break;
607
608 for (i = 0; i < pages; i++) {
609 pfn = pagemap_pfn(buf[i]);
610 if (pfn)
611 walk_pfn(index + i, pfn, 1);
612 }
613
614 index += pages;
615 count -= pages;
616 }
617 }
618
619 static void walk_task(unsigned long index, unsigned long count)
620 {
621 const unsigned long end = index + count;
622 unsigned long start;
623 int i = 0;
624
625 while (index < end) {
626
627 while (pg_end[i] <= index)
628 if (++i >= nr_vmas)
629 return;
630 if (pg_start[i] >= end)
631 return;
632
633 start = max_t(unsigned long, pg_start[i], index);
634 index = min_t(unsigned long, pg_end[i], end);
635
636 assert(start < index);
637 walk_vma(start, index - start);
638 }
639 }
640
641 static void add_addr_range(unsigned long offset, unsigned long size)
642 {
643 if (nr_addr_ranges >= MAX_ADDR_RANGES)
644 fatal("too many addr ranges\n");
645
646 opt_offset[nr_addr_ranges] = offset;
647 opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
648 nr_addr_ranges++;
649 }
650
651 static void walk_addr_ranges(void)
652 {
653 int i;
654
655 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
656
657 if (!nr_addr_ranges)
658 add_addr_range(0, ULONG_MAX);
659
660 for (i = 0; i < nr_addr_ranges; i++)
661 if (!opt_pid)
662 walk_pfn(0, opt_offset[i], opt_size[i]);
663 else
664 walk_task(opt_offset[i], opt_size[i]);
665
666 close(kpageflags_fd);
667 }
668
669
670 /*
671 * user interface
672 */
673
674 static const char *page_flag_type(uint64_t flag)
675 {
676 if (flag & KPF_HACKERS_BITS)
677 return "(r)";
678 if (flag & KPF_OVERLOADED_BITS)
679 return "(o)";
680 return " ";
681 }
682
683 static void usage(void)
684 {
685 size_t i, j;
686
687 printf(
688 "page-types [options]\n"
689 " -r|--raw Raw mode, for kernel developers\n"
690 " -d|--describe flags Describe flags\n"
691 " -a|--addr addr-spec Walk a range of pages\n"
692 " -b|--bits bits-spec Walk pages with specified bits\n"
693 " -p|--pid pid Walk process address space\n"
694 #if 0 /* planned features */
695 " -f|--file filename Walk file address space\n"
696 #endif
697 " -l|--list Show page details in ranges\n"
698 " -L|--list-each Show page details one by one\n"
699 " -N|--no-summary Don't show summary info\n"
700 " -X|--hwpoison hwpoison pages\n"
701 " -x|--unpoison unpoison pages\n"
702 " -h|--help Show this usage message\n"
703 "flags:\n"
704 " 0x10 bitfield format, e.g.\n"
705 " anon bit-name, e.g.\n"
706 " 0x10,anon comma-separated list, e.g.\n"
707 "addr-spec:\n"
708 " N one page at offset N (unit: pages)\n"
709 " N+M pages range from N to N+M-1\n"
710 " N,M pages range from N to M-1\n"
711 " N, pages range from N to end\n"
712 " ,M pages range from 0 to M-1\n"
713 "bits-spec:\n"
714 " bit1,bit2 (flags & (bit1|bit2)) != 0\n"
715 " bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
716 " bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
717 " =bit1,bit2 flags == (bit1|bit2)\n"
718 "bit-names:\n"
719 );
720
721 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
722 if (!page_flag_names[i])
723 continue;
724 printf("%16s%s", page_flag_names[i] + 2,
725 page_flag_type(1ULL << i));
726 if (++j > 3) {
727 j = 0;
728 putchar('\n');
729 }
730 }
731 printf("\n "
732 "(r) raw mode bits (o) overloaded bits\n");
733 }
734
735 static unsigned long long parse_number(const char *str)
736 {
737 unsigned long long n;
738
739 n = strtoll(str, NULL, 0);
740
741 if (n == 0 && str[0] != '0')
742 fatal("invalid name or number: %s\n", str);
743
744 return n;
745 }
746
747 static void parse_pid(const char *str)
748 {
749 FILE *file;
750 char buf[5000];
751
752 opt_pid = parse_number(str);
753
754 sprintf(buf, "/proc/%d/pagemap", opt_pid);
755 pagemap_fd = checked_open(buf, O_RDONLY);
756
757 sprintf(buf, "/proc/%d/maps", opt_pid);
758 file = fopen(buf, "r");
759 if (!file) {
760 perror(buf);
761 exit(EXIT_FAILURE);
762 }
763
764 while (fgets(buf, sizeof(buf), file) != NULL) {
765 unsigned long vm_start;
766 unsigned long vm_end;
767 unsigned long long pgoff;
768 int major, minor;
769 char r, w, x, s;
770 unsigned long ino;
771 int n;
772
773 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
774 &vm_start,
775 &vm_end,
776 &r, &w, &x, &s,
777 &pgoff,
778 &major, &minor,
779 &ino);
780 if (n < 10) {
781 fprintf(stderr, "unexpected line: %s\n", buf);
782 continue;
783 }
784 pg_start[nr_vmas] = vm_start / page_size;
785 pg_end[nr_vmas] = vm_end / page_size;
786 if (++nr_vmas >= MAX_VMAS) {
787 fprintf(stderr, "too many VMAs\n");
788 break;
789 }
790 }
791 fclose(file);
792 }
793
794 static void parse_file(const char *name)
795 {
796 }
797
798 static void parse_addr_range(const char *optarg)
799 {
800 unsigned long offset;
801 unsigned long size;
802 char *p;
803
804 p = strchr(optarg, ',');
805 if (!p)
806 p = strchr(optarg, '+');
807
808 if (p == optarg) {
809 offset = 0;
810 size = parse_number(p + 1);
811 } else if (p) {
812 offset = parse_number(optarg);
813 if (p[1] == '\0')
814 size = ULONG_MAX;
815 else {
816 size = parse_number(p + 1);
817 if (*p == ',') {
818 if (size < offset)
819 fatal("invalid range: %lu,%lu\n",
820 offset, size);
821 size -= offset;
822 }
823 }
824 } else {
825 offset = parse_number(optarg);
826 size = 1;
827 }
828
829 add_addr_range(offset, size);
830 }
831
832 static void add_bits_filter(uint64_t mask, uint64_t bits)
833 {
834 if (nr_bit_filters >= MAX_BIT_FILTERS)
835 fatal("too much bit filters\n");
836
837 opt_mask[nr_bit_filters] = mask;
838 opt_bits[nr_bit_filters] = bits;
839 nr_bit_filters++;
840 }
841
842 static uint64_t parse_flag_name(const char *str, int len)
843 {
844 size_t i;
845
846 if (!*str || !len)
847 return 0;
848
849 if (len <= 8 && !strncmp(str, "compound", len))
850 return BITS_COMPOUND;
851
852 for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
853 if (!page_flag_names[i])
854 continue;
855 if (!strncmp(str, page_flag_names[i] + 2, len))
856 return 1ULL << i;
857 }
858
859 return parse_number(str);
860 }
861
862 static uint64_t parse_flag_names(const char *str, int all)
863 {
864 const char *p = str;
865 uint64_t flags = 0;
866
867 while (1) {
868 if (*p == ',' || *p == '=' || *p == '\0') {
869 if ((*str != '~') || (*str == '~' && all && *++str))
870 flags |= parse_flag_name(str, p - str);
871 if (*p != ',')
872 break;
873 str = p + 1;
874 }
875 p++;
876 }
877
878 return flags;
879 }
880
881 static void parse_bits_mask(const char *optarg)
882 {
883 uint64_t mask;
884 uint64_t bits;
885 const char *p;
886
887 p = strchr(optarg, '=');
888 if (p == optarg) {
889 mask = KPF_ALL_BITS;
890 bits = parse_flag_names(p + 1, 0);
891 } else if (p) {
892 mask = parse_flag_names(optarg, 0);
893 bits = parse_flag_names(p + 1, 0);
894 } else if (strchr(optarg, '~')) {
895 mask = parse_flag_names(optarg, 1);
896 bits = parse_flag_names(optarg, 0);
897 } else {
898 mask = parse_flag_names(optarg, 0);
899 bits = KPF_ALL_BITS;
900 }
901
902 add_bits_filter(mask, bits);
903 }
904
905 static void describe_flags(const char *optarg)
906 {
907 uint64_t flags = parse_flag_names(optarg, 0);
908
909 printf("0x%016llx\t%s\t%s\n",
910 (unsigned long long)flags,
911 page_flag_name(flags),
912 page_flag_longname(flags));
913 }
914
915 static const struct option opts[] = {
916 { "raw" , 0, NULL, 'r' },
917 { "pid" , 1, NULL, 'p' },
918 { "file" , 1, NULL, 'f' },
919 { "addr" , 1, NULL, 'a' },
920 { "bits" , 1, NULL, 'b' },
921 { "describe" , 1, NULL, 'd' },
922 { "list" , 0, NULL, 'l' },
923 { "list-each" , 0, NULL, 'L' },
924 { "no-summary", 0, NULL, 'N' },
925 { "hwpoison" , 0, NULL, 'X' },
926 { "unpoison" , 0, NULL, 'x' },
927 { "help" , 0, NULL, 'h' },
928 { NULL , 0, NULL, 0 }
929 };
930
931 int main(int argc, char *argv[])
932 {
933 int c;
934
935 page_size = getpagesize();
936
937 while ((c = getopt_long(argc, argv,
938 "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
939 switch (c) {
940 case 'r':
941 opt_raw = 1;
942 break;
943 case 'p':
944 parse_pid(optarg);
945 break;
946 case 'f':
947 parse_file(optarg);
948 break;
949 case 'a':
950 parse_addr_range(optarg);
951 break;
952 case 'b':
953 parse_bits_mask(optarg);
954 break;
955 case 'd':
956 describe_flags(optarg);
957 exit(0);
958 case 'l':
959 opt_list = 1;
960 break;
961 case 'L':
962 opt_list = 2;
963 break;
964 case 'N':
965 opt_no_summary = 1;
966 break;
967 case 'X':
968 opt_hwpoison = 1;
969 prepare_hwpoison_fd();
970 break;
971 case 'x':
972 opt_unpoison = 1;
973 prepare_hwpoison_fd();
974 break;
975 case 'h':
976 usage();
977 exit(0);
978 default:
979 usage();
980 exit(1);
981 }
982 }
983
984 if (opt_list && opt_pid)
985 printf("voffset\t");
986 if (opt_list == 1)
987 printf("offset\tlen\tflags\n");
988 if (opt_list == 2)
989 printf("offset\tflags\n");
990
991 walk_addr_ranges();
992
993 if (opt_list == 1)
994 show_page_range(0, 0, 0); /* drain the buffer */
995
996 if (opt_no_summary)
997 return 0;
998
999 if (opt_list)
1000 printf("\n\n");
1001
1002 show_summary();
1003
1004 return 0;
1005 }
Linus' kernel tree