Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux
[~shefty/rdma-dev.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 <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 }