ea44ea502da1ef60e2a04b3ab9e42cf643ac7711
[linux-2.6.git] / Documentation / vm / page-types.c
1 /*
2  * page-types: Tool for querying page flags
3  *
4  * Copyright (C) 2009 Intel corporation
5  *
6  * Authors: Wu Fengguang <fengguang.wu@intel.com>
7  *
8  * Released under the General Public License (GPL).
9  */
10
11 #define _LARGEFILE64_SOURCE
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>
20 #include <assert.h>
21 #include <sys/types.h>
22 #include <sys/errno.h>
23 #include <sys/fcntl.h>
24
25
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
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
75 #define KPF_HWPOISON            19
76 #define KPF_NOPAGE              20
77 #define KPF_KSM                 21
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
103 static 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",
124         [KPF_HWPOISON]          = "X:hwpoison",
125         [KPF_NOPAGE]            = "n:nopage",
126         [KPF_KSM]               = "x:ksm",
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
148 static int              opt_raw;        /* for kernel developers */
149 static int              opt_list;       /* list pages (in ranges) */
150 static int              opt_no_summary; /* don't show summary */
151 static pid_t            opt_pid;        /* process to walk */
152
153 #define MAX_ADDR_RANGES 1024
154 static int              nr_addr_ranges;
155 static unsigned long    opt_offset[MAX_ADDR_RANGES];
156 static unsigned long    opt_size[MAX_ADDR_RANGES];
157
158 #define MAX_VMAS        10240
159 static int              nr_vmas;
160 static unsigned long    pg_start[MAX_VMAS];
161 static unsigned long    pg_end[MAX_VMAS];
162
163 #define MAX_BIT_FILTERS 64
164 static int              nr_bit_filters;
165 static uint64_t         opt_mask[MAX_BIT_FILTERS];
166 static uint64_t         opt_bits[MAX_BIT_FILTERS];
167
168 static int              page_size;
169
170 static int              pagemap_fd;
171 static int              kpageflags_fd;
172
173 static int              opt_hwpoison;
174 static int              opt_unpoison;
175
176 static char             *hwpoison_debug_fs = "/debug/hwpoison";
177 static int              hwpoison_inject_fd;
178 static int              hwpoison_forget_fd;
179
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
185 static unsigned long    total_pages;
186 static unsigned long    nr_pages[HASH_SIZE];
187 static 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
201 #define max_t(type, x, y) ({                    \
202         type __max1 = (x);                      \
203         type __max2 = (y);                      \
204         __max1 > __max2 ? __max1 : __max2; })
205
206 static unsigned long pages2mb(unsigned long pages)
207 {
208         return (pages * page_size) >> 20;
209 }
210
211 static void fatal(const char *x, ...)
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
221 static int checked_open(const char *pathname, int flags)
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
233 /*
234  * pagemap/kpageflags routines
235  */
236
237 static 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
263 static 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
270 static 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
277 static 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
289
290 /*
291  * page flag names
292  */
293
294 static char *page_flag_name(uint64_t flags)
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("unknown flag bit %d\n", i);
305                         continue;
306                 }
307                 buf[j++] = present ? page_flag_names[i][0] : '_';
308         }
309
310         return buf;
311 }
312
313 static char *page_flag_longname(uint64_t flags)
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
337 static void show_page_range(unsigned long voffset,
338                             unsigned long offset, uint64_t flags)
339 {
340         static uint64_t      flags0;
341         static unsigned long voff;
342         static unsigned long index;
343         static unsigned long count;
344
345         if (flags == flags0 && offset == index + count &&
346             (!opt_pid || voffset == voff + count)) {
347                 count++;
348                 return;
349         }
350
351         if (count) {
352                 if (opt_pid)
353                         printf("%lx\t", voff);
354                 printf("%lx\t%lx\t%s\n",
355                                 index, count, page_flag_name(flags0));
356         }
357
358         flags0 = flags;
359         index  = offset;
360         voff   = voffset;
361         count  = 1;
362 }
363
364 static void show_page(unsigned long voffset,
365                       unsigned long offset, uint64_t flags)
366 {
367         if (opt_pid)
368                 printf("%lx\t", voffset);
369         printf("%lx\t%s\n", offset, page_flag_name(flags));
370 }
371
372 static void show_summary(void)
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
398 static int bit_mask_ok(uint64_t flags)
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
415 static uint64_t expand_overloaded_flags(uint64_t flags)
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
434 static uint64_t well_known_flags(uint64_t flags)
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
446 static 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
456 /*
457  * page actions
458  */
459
460 static 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
475 static 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
489 static 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
503 /*
504  * page frame walker
505  */
506
507 static int hash_slot(uint64_t flags)
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
534 static void add_page(unsigned long voffset,
535                      unsigned long offset, uint64_t flags)
536 {
537         flags = kpageflags_flags(flags);
538
539         if (!bit_mask_ok(flags))
540                 return;
541
542         if (opt_hwpoison)
543                 hwpoison_page(offset);
544         if (opt_unpoison)
545                 unpoison_page(offset);
546
547         if (opt_list == 1)
548                 show_page_range(voffset, offset, flags);
549         else if (opt_list == 2)
550                 show_page(voffset, offset, flags);
551
552         nr_pages[hash_slot(flags)]++;
553         total_pages++;
554 }
555
556 #define KPAGEFLAGS_BATCH        (64 << 10)      /* 64k pages */
557 static void walk_pfn(unsigned long voffset,
558                      unsigned long index,
559                      unsigned long count)
560 {
561         uint64_t buf[KPAGEFLAGS_BATCH];
562         unsigned long batch;
563         unsigned long pages;
564         unsigned long i;
565
566         while (count) {
567                 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
568                 pages = kpageflags_read(buf, index, batch);
569                 if (pages == 0)
570                         break;
571
572                 for (i = 0; i < pages; i++)
573                         add_page(voffset + i, index + i, buf[i]);
574
575                 index += pages;
576                 count -= pages;
577         }
578 }
579
580 #define PAGEMAP_BATCH   (64 << 10)
581 static void walk_vma(unsigned long index, unsigned long count)
582 {
583         uint64_t buf[PAGEMAP_BATCH];
584         unsigned long batch;
585         unsigned long pages;
586         unsigned long pfn;
587         unsigned long i;
588
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;
594
595                 for (i = 0; i < pages; i++) {
596                         pfn = pagemap_pfn(buf[i]);
597                         if (pfn)
598                                 walk_pfn(index + i, pfn, 1);
599                 }
600
601                 index += pages;
602                 count -= pages;
603         }
604 }
605
606 static void walk_task(unsigned long index, unsigned long count)
607 {
608         const unsigned long end = index + count;
609         unsigned long start;
610         int i = 0;
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
620                 start = max_t(unsigned long, pg_start[i], index);
621                 index = min_t(unsigned long, pg_end[i], end);
622
623                 assert(start < index);
624                 walk_vma(start, index - start);
625         }
626 }
627
628 static 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
638 static void walk_addr_ranges(void)
639 {
640         int i;
641
642         kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
643
644         if (!nr_addr_ranges)
645                 add_addr_range(0, ULONG_MAX);
646
647         for (i = 0; i < nr_addr_ranges; i++)
648                 if (!opt_pid)
649                         walk_pfn(0, opt_offset[i], opt_size[i]);
650                 else
651                         walk_task(opt_offset[i], opt_size[i]);
652
653         close(kpageflags_fd);
654 }
655
656
657 /*
658  * user interface
659  */
660
661 static const char *page_flag_type(uint64_t flag)
662 {
663         if (flag & KPF_HACKERS_BITS)
664                 return "(r)";
665         if (flag & KPF_OVERLOADED_BITS)
666                 return "(o)";
667         return "   ";
668 }
669
670 static void usage(void)
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"
679 "            -p|--pid     pid          Walk process address space\n"
680 #if 0 /* planned features */
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"
686 "            -X|--hwpoison             hwpoison pages\n"
687 "            -x|--unpoison             unpoison pages\n"
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"
694 "            ,M                        pages range from 0 to M-1\n"
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
717 static unsigned long long parse_number(const char *str)
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
729 static void parse_pid(const char *str)
730 {
731         FILE *file;
732         char buf[5000];
733
734         opt_pid = parse_number(str);
735
736         sprintf(buf, "/proc/%d/pagemap", opt_pid);
737         pagemap_fd = checked_open(buf, O_RDONLY);
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);
774 }
775
776 static void parse_file(const char *name)
777 {
778 }
779
780 static void parse_addr_range(const char *optarg)
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
814 static void add_bits_filter(uint64_t mask, uint64_t bits)
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
824 static uint64_t parse_flag_name(const char *str, int len)
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
844 static uint64_t parse_flag_names(const char *str, int all)
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
863 static void parse_bits_mask(const char *optarg)
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
888 static struct option opts[] = {
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' },
897         { "hwpoison"  , 0, NULL, 'X' },
898         { "unpoison"  , 0, NULL, 'x' },
899         { "help"      , 0, NULL, 'h' },
900         { NULL        , 0, NULL, 0 }
901 };
902
903 int main(int argc, char *argv[])
904 {
905         int c;
906
907         page_size = getpagesize();
908
909         while ((c = getopt_long(argc, argv,
910                                 "rp:f:a:b:lLNXxh", opts, NULL)) != -1) {
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;
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;
944                 case 'h':
945                         usage();
946                         exit(0);
947                 default:
948                         usage();
949                         exit(1);
950                 }
951         }
952
953         if (opt_list && opt_pid)
954                 printf("voffset\t");
955         if (opt_list == 1)
956                 printf("offset\tlen\tflags\n");
957         if (opt_list == 2)
958                 printf("offset\tflags\n");
959
960         walk_addr_ranges();
961
962         if (opt_list == 1)
963                 show_page_range(0, 0, 0);  /* drain the buffer */
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 }