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Merge tag 'devicetree-for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / tools / vm / page-types.c
CommitLineData
35efa5e9
WF		 1/*
2 * page-types: Tool for querying page flags
3 *
0e9052eb
WF		 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 *
35efa5e9 17 * Copyright (C) 2009 Intel corporation
0c57effe
WF		 18 *
19 * Authors: Wu Fengguang <fengguang.wu@intel.com>
35efa5e9
WF		 20 */
21
65a6a410
KK		 22#define _FILE_OFFSET_BITS 64
23#define _GNU_SOURCE
35efa5e9
WF		 24#include <stdio.h>
25#include <stdlib.h>
26#include <unistd.h>
27#include <stdint.h>
28#include <stdarg.h>
29#include <string.h>
30#include <getopt.h>
31#include <limits.h>
0b4b2ad5 32#include <assert.h>
65a6a410
KK		 33#include <ftw.h>
34#include <time.h>
35efa5e9
WF		 35#include <sys/types.h>
36#include <sys/errno.h>
37#include <sys/fcntl.h>
12da58b0
CG		 38#include <sys/mount.h>
39#include <sys/statfs.h>
65a6a410 40#include <sys/mman.h>
607ca46e 41#include "../../include/uapi/linux/magic.h"
59ce8764 42#include "../../include/uapi/linux/kernel-page-flags.h"
553873e1 43#include <api/fs/debugfs.h>
35efa5e9 44
12da58b0
CG		 45#ifndef MAX_PATH
46# define MAX_PATH 256
47#endif
48
49#ifndef STR
50# define _STR(x) #x
51# define STR(x) _STR(x)
52#endif
53
0b4b2ad5
WF		 54/*
55 * pagemap kernel ABI bits
56 */
57
58#define PM_ENTRY_BYTES sizeof(uint64_t)
59#define PM_STATUS_BITS 3
60#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
61#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
62#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
63#define PM_PSHIFT_BITS 6
64#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
65#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
46c77e2b 66#define __PM_PSHIFT(x) (((uint64_t) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
0b4b2ad5
WF		 67#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
68#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
69
46c77e2b 70#define __PM_SOFT_DIRTY (1LL)
0b4b2ad5
WF		 71#define PM_PRESENT PM_STATUS(4LL)
72#define PM_SWAP PM_STATUS(2LL)
46c77e2b 73#define PM_SOFT_DIRTY __PM_PSHIFT(__PM_SOFT_DIRTY)
0b4b2ad5
WF		 74
75
35efa5e9
WF		 76/*
77 * kernel page flags
78 */
79
80#define KPF_BYTES 8
81#define PROC_KPAGEFLAGS "/proc/kpageflags"
82
35efa5e9
WF		 83/* [32-] kernel hacking assistances */
84#define KPF_RESERVED 32
85#define KPF_MLOCKED 33
86#define KPF_MAPPEDTODISK 34
87#define KPF_PRIVATE 35
88#define KPF_PRIVATE_2 36
89#define KPF_OWNER_PRIVATE 37
90#define KPF_ARCH 38
91#define KPF_UNCACHED 39
46c77e2b 92#define KPF_SOFTDIRTY 40
35efa5e9
WF		 93
94/* [48-] take some arbitrary free slots for expanding overloaded flags
95 * not part of kernel API
96 */
97#define KPF_READAHEAD 48
98#define KPF_SLOB_FREE 49
99#define KPF_SLUB_FROZEN 50
100#define KPF_SLUB_DEBUG 51
101
102#define KPF_ALL_BITS ((uint64_t)~0ULL)
103#define KPF_HACKERS_BITS (0xffffULL << 32)
104#define KPF_OVERLOADED_BITS (0xffffULL << 48)
105#define BIT(name) (1ULL << KPF_##name)
106#define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
107
c6dd897f 108static const char * const page_flag_names[] = {
35efa5e9
WF		 109 [KPF_LOCKED] = "L:locked",
110 [KPF_ERROR] = "E:error",
111 [KPF_REFERENCED] = "R:referenced",
112 [KPF_UPTODATE] = "U:uptodate",
113 [KPF_DIRTY] = "D:dirty",
114 [KPF_LRU] = "l:lru",
115 [KPF_ACTIVE] = "A:active",
116 [KPF_SLAB] = "S:slab",
117 [KPF_WRITEBACK] = "W:writeback",
118 [KPF_RECLAIM] = "I:reclaim",
119 [KPF_BUDDY] = "B:buddy",
120
121 [KPF_MMAP] = "M:mmap",
122 [KPF_ANON] = "a:anonymous",
123 [KPF_SWAPCACHE] = "s:swapcache",
124 [KPF_SWAPBACKED] = "b:swapbacked",
125 [KPF_COMPOUND_HEAD] = "H:compound_head",
126 [KPF_COMPOUND_TAIL] = "T:compound_tail",
127 [KPF_HUGE] = "G:huge",
128 [KPF_UNEVICTABLE] = "u:unevictable",
253fb02d 129 [KPF_HWPOISON] = "X:hwpoison",
35efa5e9 130 [KPF_NOPAGE] = "n:nopage",
a1bbb5ec 131 [KPF_KSM] = "x:ksm",
807f0ccf 132 [KPF_THP] = "t:thp",
35efa5e9
WF		 133
134 [KPF_RESERVED] = "r:reserved",
135 [KPF_MLOCKED] = "m:mlocked",
136 [KPF_MAPPEDTODISK] = "d:mappedtodisk",
137 [KPF_PRIVATE] = "P:private",
138 [KPF_PRIVATE_2] = "p:private_2",
139 [KPF_OWNER_PRIVATE] = "O:owner_private",
140 [KPF_ARCH] = "h:arch",
141 [KPF_UNCACHED] = "c:uncached",
46c77e2b 142 [KPF_SOFTDIRTY] = "f:softdirty",
35efa5e9
WF		 143
144 [KPF_READAHEAD] = "I:readahead",
145 [KPF_SLOB_FREE] = "P:slob_free",
146 [KPF_SLUB_FROZEN] = "A:slub_frozen",
147 [KPF_SLUB_DEBUG] = "E:slub_debug",
148};
149
150
c6dd897f 151static const char * const debugfs_known_mountpoints[] = {
12da58b0
CG		 152 "/sys/kernel/debug",
153 "/debug",
154 0,
155};
156
35efa5e9
WF		 157/*
158 * data structures
159 */
160
161static int opt_raw; /* for kernel developers */
162static int opt_list; /* list pages (in ranges) */
163static int opt_no_summary; /* don't show summary */
164static pid_t opt_pid; /* process to walk */
65a6a410 165const char * opt_file;
35efa5e9
WF		 166
167#define MAX_ADDR_RANGES 1024
168static int nr_addr_ranges;
169static unsigned long opt_offset[MAX_ADDR_RANGES];
170static unsigned long opt_size[MAX_ADDR_RANGES];
171
0b4b2ad5
WF		 172#define MAX_VMAS 10240
173static int nr_vmas;
174static unsigned long pg_start[MAX_VMAS];
175static unsigned long pg_end[MAX_VMAS];
0b4b2ad5 176
35efa5e9
WF		 177#define MAX_BIT_FILTERS 64
178static int nr_bit_filters;
179static uint64_t opt_mask[MAX_BIT_FILTERS];
180static uint64_t opt_bits[MAX_BIT_FILTERS];
181
182static int page_size;
183
4a1b6726 184static int pagemap_fd;
35efa5e9 185static int kpageflags_fd;
35efa5e9 186
a54fed9f
WF		 187static int opt_hwpoison;
188static int opt_unpoison;
189
5a439645 190static char *hwpoison_debug_fs;
a54fed9f
WF		 191static int hwpoison_inject_fd;
192static int hwpoison_forget_fd;
193
35efa5e9
WF		 194#define HASH_SHIFT 13
195#define HASH_SIZE (1 << HASH_SHIFT)
196#define HASH_MASK (HASH_SIZE - 1)
197#define HASH_KEY(flags) (flags & HASH_MASK)
198
199static unsigned long total_pages;
200static unsigned long nr_pages[HASH_SIZE];
c6dd897f 201static uint64_t page_flags[HASH_SIZE];
35efa5e9
WF		 202
203
204/*
205 * helper functions
206 */
207
208#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
209
210#define min_t(type, x, y) ({ \
211 type __min1 = (x); \
212 type __min2 = (y); \
213 __min1 < __min2 ? __min1 : __min2; })
214
0b4b2ad5
WF		 215#define max_t(type, x, y) ({ \
216 type __max1 = (x); \
217 type __max2 = (y); \
218 __max1 > __max2 ? __max1 : __max2; })
219
b7ed698c 220static unsigned long pages2mb(unsigned long pages)
35efa5e9
WF		 221{
222 return (pages * page_size) >> 20;
223}
224
b7ed698c 225static void fatal(const char *x, ...)
35efa5e9
WF		 226{
227 va_list ap;
228
229 va_start(ap, x);
230 vfprintf(stderr, x, ap);
231 va_end(ap);
232 exit(EXIT_FAILURE);
233}
234
1b98c00b 235static int checked_open(const char *pathname, int flags)
31bbf66e
WF		 236{
237 int fd = open(pathname, flags);
238
239 if (fd < 0) {
240 perror(pathname);
241 exit(EXIT_FAILURE);
242 }
243
244 return fd;
245}
246
4a1b6726
WF		 247/*
248 * pagemap/kpageflags routines
249 */
250
251static unsigned long do_u64_read(int fd, char *name,
252 uint64_t *buf,
253 unsigned long index,
254 unsigned long count)
255{
256 long bytes;
257
258 if (index > ULONG_MAX / 8)
259 fatal("index overflow: %lu\n", index);
260
65a6a410 261 bytes = pread(fd, buf, count * 8, (off_t)index * 8);
4a1b6726
WF		 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
272static 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
279static 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
286static 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
35efa5e9
WF		 298
299/*
300 * page flag names
301 */
302
b7ed698c 303static char *page_flag_name(uint64_t flags)
35efa5e9
WF		 304{
305 static char buf[65];
306 int present;
e30d539b 307 size_t i, j;
35efa5e9
WF		 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)
af901ca1 313 fatal("unknown flag bit %d\n", i);
35efa5e9
WF		 314 continue;
315 }
316 buf[j++] = present ? page_flag_names[i][0] : '_';
317 }
318
319 return buf;
320}
321
b7ed698c 322static char *page_flag_longname(uint64_t flags)
35efa5e9
WF		 323{
324 static char buf[1024];
e30d539b 325 size_t i, n;
35efa5e9
WF		 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
65a6a410
KK		 346static void show_page_range(unsigned long voffset, unsigned long offset,
347 unsigned long size, uint64_t flags)
35efa5e9
WF		 348{
349 static uint64_t flags0;
0b4b2ad5 350 static unsigned long voff;
35efa5e9
WF		 351 static unsigned long index;
352 static unsigned long count;
353
0b4b2ad5 354 if (flags == flags0 && offset == index + count &&
65a6a410
KK		 355 size && voffset == voff + count) {
356 count += size;
35efa5e9
WF		 357 return;
358 }
359
0b4b2ad5
WF		 360 if (count) {
361 if (opt_pid)
362 printf("%lx\t", voff);
65a6a410
KK		 363 if (opt_file)
364 printf("%lu\t", voff);
0b4b2ad5 365 printf("%lx\t%lx\t%s\n",
35efa5e9 366 index, count, page_flag_name(flags0));
0b4b2ad5 367 }
35efa5e9
WF		 368
369 flags0 = flags;
370 index = offset;
0b4b2ad5 371 voff = voffset;
65a6a410
KK		 372 count = size;
373}
374
375static void flush_page_range(void)
376{
377 show_page_range(0, 0, 0, 0);
35efa5e9
WF		 378}
379
e577ebde
WF		 380static void show_page(unsigned long voffset,
381 unsigned long offset, uint64_t flags)
35efa5e9 382{
0b4b2ad5
WF		 383 if (opt_pid)
384 printf("%lx\t", voffset);
65a6a410
KK		 385 if (opt_file)
386 printf("%lu\t", voffset);
0b4b2ad5 387 printf("%lx\t%s\n", offset, page_flag_name(flags));
35efa5e9
WF		 388}
389
b7ed698c 390static void show_summary(void)
35efa5e9 391{
e30d539b 392 size_t i;
35efa5e9
WF		 393
394 printf(" flags\tpage-count MB"
395 " symbolic-flags\t\t\tlong-symbolic-flags\n");
396
397 for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
398 if (nr_pages[i])
399 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
400 (unsigned long long)page_flags[i],
401 nr_pages[i],
402 pages2mb(nr_pages[i]),
403 page_flag_name(page_flags[i]),
404 page_flag_longname(page_flags[i]));
405 }
406
407 printf(" total\t%10lu %8lu\n",
408 total_pages, pages2mb(total_pages));
409}
410
411
412/*
413 * page flag filters
414 */
415
b7ed698c 416static int bit_mask_ok(uint64_t flags)
35efa5e9
WF		 417{
418 int i;
419
420 for (i = 0; i < nr_bit_filters; i++) {
421 if (opt_bits[i] == KPF_ALL_BITS) {
422 if ((flags & opt_mask[i]) == 0)
423 return 0;
424 } else {
425 if ((flags & opt_mask[i]) != opt_bits[i])
426 return 0;
427 }
428 }
429
430 return 1;
431}
432
46c77e2b 433static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
35efa5e9
WF		 434{
435 /* SLOB/SLUB overload several page flags */
436 if (flags & BIT(SLAB)) {
437 if (flags & BIT(PRIVATE))
438 flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
439 if (flags & BIT(ACTIVE))
440 flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
441 if (flags & BIT(ERROR))
442 flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
443 }
444
445 /* PG_reclaim is overloaded as PG_readahead in the read path */
446 if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
447 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
448
46c77e2b
NH		 449 if (pme & PM_SOFT_DIRTY)
450 flags |= BIT(SOFTDIRTY);
451
35efa5e9
WF		 452 return flags;
453}
454
b7ed698c 455static uint64_t well_known_flags(uint64_t flags)
35efa5e9
WF		 456{
457 /* hide flags intended only for kernel hacker */
458 flags &= ~KPF_HACKERS_BITS;
459
460 /* hide non-hugeTLB compound pages */
461 if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
462 flags &= ~BITS_COMPOUND;
463
464 return flags;
465}
466
46c77e2b 467static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme)
48640d69 468{
46c77e2b
NH		 469 if (opt_raw)
470 flags = expand_overloaded_flags(flags, pme);
471 else
48640d69
WF		 472 flags = well_known_flags(flags);
473
474 return flags;
475}
476
a54fed9f
WF		 477/*
478 * page actions
479 */
480
481static void prepare_hwpoison_fd(void)
482{
12da58b0
CG		 483 char buf[MAX_PATH + 1];
484
5a439645
BP		 485 hwpoison_debug_fs = debugfs_mount(NULL);
486 if (!hwpoison_debug_fs) {
487 perror("mount debugfs");
488 exit(EXIT_FAILURE);
489 }
a54fed9f
WF		 490
491 if (opt_hwpoison && !hwpoison_inject_fd) {
12da58b0
CG		 492 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
493 hwpoison_debug_fs);
a54fed9f
WF		 494 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
495 }
496
497 if (opt_unpoison && !hwpoison_forget_fd) {
12da58b0
CG		 498 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
499 hwpoison_debug_fs);
a54fed9f
WF		 500 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
501 }
502}
503
504static int hwpoison_page(unsigned long offset)
505{
506 char buf[100];
507 int len;
508
509 len = sprintf(buf, "0x%lx\n", offset);
510 len = write(hwpoison_inject_fd, buf, len);
511 if (len < 0) {
512 perror("hwpoison inject");
513 return len;
514 }
515 return 0;
516}
517
518static int unpoison_page(unsigned long offset)
519{
520 char buf[100];
521 int len;
522
523 len = sprintf(buf, "0x%lx\n", offset);
524 len = write(hwpoison_forget_fd, buf, len);
525 if (len < 0) {
526 perror("hwpoison forget");
527 return len;
528 }
529 return 0;
530}
531
35efa5e9
WF		 532/*
533 * page frame walker
534 */
535
e30d539b 536static size_t hash_slot(uint64_t flags)
35efa5e9 537{
e30d539b
UD		 538 size_t k = HASH_KEY(flags);
539 size_t i;
35efa5e9
WF		 540
541 /* Explicitly reserve slot 0 for flags 0: the following logic
542 * cannot distinguish an unoccupied slot from slot (flags==0).
543 */
544 if (flags == 0)
545 return 0;
546
547 /* search through the remaining (HASH_SIZE-1) slots */
548 for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
549 if (!k || k >= ARRAY_SIZE(page_flags))
550 k = 1;
551 if (page_flags[k] == 0) {
552 page_flags[k] = flags;
553 return k;
554 }
555 if (page_flags[k] == flags)
556 return k;
557 }
558
559 fatal("hash table full: bump up HASH_SHIFT?\n");
560 exit(EXIT_FAILURE);
561}
562
e577ebde 563static void add_page(unsigned long voffset,
46c77e2b 564 unsigned long offset, uint64_t flags, uint64_t pme)
35efa5e9 565{
46c77e2b 566 flags = kpageflags_flags(flags, pme);
35efa5e9
WF		 567
568 if (!bit_mask_ok(flags))
569 return;
570
a54fed9f
WF		 571 if (opt_hwpoison)
572 hwpoison_page(offset);
573 if (opt_unpoison)
574 unpoison_page(offset);
575
35efa5e9 576 if (opt_list == 1)
65a6a410 577 show_page_range(voffset, offset, 1, flags);
35efa5e9 578 else if (opt_list == 2)
e577ebde 579 show_page(voffset, offset, flags);
35efa5e9
WF		 580
581 nr_pages[hash_slot(flags)]++;
582 total_pages++;
583}
584
4a1b6726 585#define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
e577ebde
WF		 586static void walk_pfn(unsigned long voffset,
587 unsigned long index,
46c77e2b
NH		 588 unsigned long count,
589 uint64_t pme)
35efa5e9 590{
4a1b6726 591 uint64_t buf[KPAGEFLAGS_BATCH];
35efa5e9 592 unsigned long batch;
e30d539b 593 unsigned long pages;
35efa5e9
WF		 594 unsigned long i;
595
35efa5e9 596 while (count) {
4a1b6726
WF		 597 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
598 pages = kpageflags_read(buf, index, batch);
599 if (pages == 0)
35efa5e9 600 break;
35efa5e9 601
4a1b6726 602 for (i = 0; i < pages; i++)
46c77e2b 603 add_page(voffset + i, index + i, buf[i], pme);
35efa5e9 604
4a1b6726
WF		 605 index += pages;
606 count -= pages;
35efa5e9
WF		 607 }
608}
609
4a1b6726
WF		 610#define PAGEMAP_BATCH (64 << 10)
611static void walk_vma(unsigned long index, unsigned long count)
0b4b2ad5 612{
4a1b6726
WF		 613 uint64_t buf[PAGEMAP_BATCH];
614 unsigned long batch;
615 unsigned long pages;
616 unsigned long pfn;
617 unsigned long i;
0b4b2ad5 618
4a1b6726
WF		 619 while (count) {
620 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
621 pages = pagemap_read(buf, index, batch);
622 if (pages == 0)
623 break;
0b4b2ad5 624
4a1b6726
WF		 625 for (i = 0; i < pages; i++) {
626 pfn = pagemap_pfn(buf[i]);
4a1b6726 627 if (pfn)
46c77e2b 628 walk_pfn(index + i, pfn, 1, buf[i]);
4a1b6726
WF		 629 }
630
631 index += pages;
632 count -= pages;
633 }
0b4b2ad5
WF		 634}
635
636static void walk_task(unsigned long index, unsigned long count)
637{
0b4b2ad5 638 const unsigned long end = index + count;
e577ebde
WF		 639 unsigned long start;
640 int i = 0;
0b4b2ad5
WF		 641
642 while (index < end) {
643
644 while (pg_end[i] <= index)
645 if (++i >= nr_vmas)
646 return;
647 if (pg_start[i] >= end)
648 return;
649
e577ebde
WF		 650 start = max_t(unsigned long, pg_start[i], index);
651 index = min_t(unsigned long, pg_end[i], end);
0b4b2ad5 652
e577ebde
WF		 653 assert(start < index);
654 walk_vma(start, index - start);
0b4b2ad5
WF		 655 }
656}
657
658static void add_addr_range(unsigned long offset, unsigned long size)
659{
660 if (nr_addr_ranges >= MAX_ADDR_RANGES)
661 fatal("too many addr ranges\n");
662
663 opt_offset[nr_addr_ranges] = offset;
664 opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
665 nr_addr_ranges++;
666}
667
b7ed698c 668static void walk_addr_ranges(void)
35efa5e9
WF		 669{
670 int i;
671
31bbf66e 672 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
35efa5e9
WF		 673
674 if (!nr_addr_ranges)
0b4b2ad5 675 add_addr_range(0, ULONG_MAX);
35efa5e9
WF		 676
677 for (i = 0; i < nr_addr_ranges; i++)
0b4b2ad5 678 if (!opt_pid)
65a6a410 679 walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0);
0b4b2ad5
WF		 680 else
681 walk_task(opt_offset[i], opt_size[i]);
35efa5e9
WF		 682
683 close(kpageflags_fd);
684}
685
686
687/*
688 * user interface
689 */
690
b7ed698c 691static const char *page_flag_type(uint64_t flag)
35efa5e9
WF		 692{
693 if (flag & KPF_HACKERS_BITS)
694 return "(r)";
695 if (flag & KPF_OVERLOADED_BITS)
696 return "(o)";
697 return " ";
698}
699
b7ed698c 700static void usage(void)
35efa5e9 701{
e30d539b 702 size_t i, j;
35efa5e9
WF		 703
704 printf(
705"page-types [options]\n"
9fdcd886 706" -r|--raw Raw mode, for kernel developers\n"
dcfe730c 707" -d|--describe flags Describe flags\n"
9fdcd886
AC		 708" -a|--addr addr-spec Walk a range of pages\n"
709" -b|--bits bits-spec Walk pages with specified bits\n"
710" -p|--pid pid Walk process address space\n"
9fdcd886 711" -f|--file filename Walk file address space\n"
9fdcd886
AC		 712" -l|--list Show page details in ranges\n"
713" -L|--list-each Show page details one by one\n"
c7825cfa 714" -N|--no-summary Don't show summary info\n"
9fdcd886
AC		 715" -X|--hwpoison hwpoison pages\n"
716" -x|--unpoison unpoison pages\n"
717" -h|--help Show this usage message\n"
dcfe730c 718"flags:\n"
9fdcd886
AC		 719" 0x10 bitfield format, e.g.\n"
720" anon bit-name, e.g.\n"
721" 0x10,anon comma-separated list, e.g.\n"
35efa5e9 722"addr-spec:\n"
9fdcd886
AC		 723" N one page at offset N (unit: pages)\n"
724" N+M pages range from N to N+M-1\n"
725" N,M pages range from N to M-1\n"
726" N, pages range from N to end\n"
727" ,M pages range from 0 to M-1\n"
35efa5e9 728"bits-spec:\n"
9fdcd886
AC		 729" bit1,bit2 (flags & (bit1|bit2)) != 0\n"
730" bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
731" bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
732" =bit1,bit2 flags == (bit1|bit2)\n"
35efa5e9
WF		 733"bit-names:\n"
734 );
735
736 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
737 if (!page_flag_names[i])
738 continue;
739 printf("%16s%s", page_flag_names[i] + 2,
740 page_flag_type(1ULL << i));
741 if (++j > 3) {
742 j = 0;
743 putchar('\n');
744 }
745 }
746 printf("\n "
747 "(r) raw mode bits (o) overloaded bits\n");
748}
749
b7ed698c 750static unsigned long long parse_number(const char *str)
35efa5e9
WF		 751{
752 unsigned long long n;
753
754 n = strtoll(str, NULL, 0);
755
756 if (n == 0 && str[0] != '0')
757 fatal("invalid name or number: %s\n", str);
758
759 return n;
760}
761
b7ed698c 762static void parse_pid(const char *str)
35efa5e9 763{
0b4b2ad5
WF		 764 FILE *file;
765 char buf[5000];
766
35efa5e9 767 opt_pid = parse_number(str);
35efa5e9 768
0b4b2ad5 769 sprintf(buf, "/proc/%d/pagemap", opt_pid);
31bbf66e 770 pagemap_fd = checked_open(buf, O_RDONLY);
0b4b2ad5
WF		 771
772 sprintf(buf, "/proc/%d/maps", opt_pid);
773 file = fopen(buf, "r");
774 if (!file) {
775 perror(buf);
776 exit(EXIT_FAILURE);
777 }
778
779 while (fgets(buf, sizeof(buf), file) != NULL) {
780 unsigned long vm_start;
781 unsigned long vm_end;
782 unsigned long long pgoff;
783 int major, minor;
784 char r, w, x, s;
785 unsigned long ino;
786 int n;
787
788 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
789 &vm_start,
790 &vm_end,
791 &r, &w, &x, &s,
792 &pgoff,
793 &major, &minor,
794 &ino);
795 if (n < 10) {
796 fprintf(stderr, "unexpected line: %s\n", buf);
797 continue;
798 }
799 pg_start[nr_vmas] = vm_start / page_size;
800 pg_end[nr_vmas] = vm_end / page_size;
801 if (++nr_vmas >= MAX_VMAS) {
802 fprintf(stderr, "too many VMAs\n");
803 break;
804 }
805 }
806 fclose(file);
35efa5e9
WF		 807}
808
65a6a410
KK		 809static void show_file(const char *name, const struct stat *st)
810{
811 unsigned long long size = st->st_size;
812 char atime[64], mtime[64];
813 long now = time(NULL);
814
815 printf("%s\tInode: %u\tSize: %llu (%llu pages)\n",
816 name, (unsigned)st->st_ino,
817 size, (size + page_size - 1) / page_size);
818
819 strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime));
820 strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime));
821
822 printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n",
823 mtime, now - st->st_mtime,
824 atime, now - st->st_atime);
825}
826
827static void walk_file(const char *name, const struct stat *st)
828{
829 uint8_t vec[PAGEMAP_BATCH];
830 uint64_t buf[PAGEMAP_BATCH], flags;
831 unsigned long nr_pages, pfn, i;
832 int fd;
833 off_t off;
834 ssize_t len;
835 void *ptr;
836 int first = 1;
837
838 fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
839
840 for (off = 0; off < st->st_size; off += len) {
841 nr_pages = (st->st_size - off + page_size - 1) / page_size;
842 if (nr_pages > PAGEMAP_BATCH)
843 nr_pages = PAGEMAP_BATCH;
844 len = nr_pages * page_size;
845
846 ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off);
847 if (ptr == MAP_FAILED)
848 fatal("mmap failed: %s", name);
849
850 /* determine cached pages */
851 if (mincore(ptr, len, vec))
852 fatal("mincore failed: %s", name);
853
854 /* turn off readahead */
855 if (madvise(ptr, len, MADV_RANDOM))
856 fatal("madvice failed: %s", name);
857
858 /* populate ptes */
859 for (i = 0; i < nr_pages ; i++) {
860 if (vec[i] & 1)
861 (void)*(volatile int *)(ptr + i * page_size);
862 }
863
864 /* turn off harvesting reference bits */
865 if (madvise(ptr, len, MADV_SEQUENTIAL))
866 fatal("madvice failed: %s", name);
867
868 if (pagemap_read(buf, (unsigned long)ptr / page_size,
869 nr_pages) != nr_pages)
870 fatal("cannot read pagemap");
871
872 munmap(ptr, len);
873
874 for (i = 0; i < nr_pages; i++) {
875 pfn = pagemap_pfn(buf[i]);
876 if (!pfn)
877 continue;
878 if (!kpageflags_read(&flags, pfn, 1))
879 continue;
880 if (first && opt_list) {
881 first = 0;
882 flush_page_range();
883 show_file(name, st);
884 }
885 add_page(off / page_size + i, pfn, flags, buf[i]);
886 }
887 }
888
889 close(fd);
890}
891
892int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f)
893{
894 (void)f;
895 switch (type) {
896 case FTW_F:
897 if (S_ISREG(st->st_mode))
898 walk_file(name, st);
899 break;
900 case FTW_DNR:
901 fprintf(stderr, "cannot read dir: %s\n", name);
902 break;
903 }
904 return 0;
905}
906
907static void walk_page_cache(void)
908{
909 struct stat st;
910
911 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
912 pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
913
914 if (stat(opt_file, &st))
915 fatal("stat failed: %s\n", opt_file);
916
917 if (S_ISREG(st.st_mode)) {
918 walk_file(opt_file, &st);
919 } else if (S_ISDIR(st.st_mode)) {
920 /* do not follow symlinks and mountpoints */
921 if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0)
922 fatal("nftw failed: %s\n", opt_file);
923 } else
924 fatal("unhandled file type: %s\n", opt_file);
925
926 close(kpageflags_fd);
927 close(pagemap_fd);
928}
929
0b4b2ad5 930static void parse_file(const char *name)
35efa5e9 931{
65a6a410 932 opt_file = name;
35efa5e9
WF		 933}
934
b7ed698c 935static void parse_addr_range(const char *optarg)
35efa5e9
WF		 936{
937 unsigned long offset;
938 unsigned long size;
939 char *p;
940
941 p = strchr(optarg, ',');
942 if (!p)
943 p = strchr(optarg, '+');
944
945 if (p == optarg) {
946 offset = 0;
947 size = parse_number(p + 1);
948 } else if (p) {
949 offset = parse_number(optarg);
950 if (p[1] == '\0')
951 size = ULONG_MAX;
952 else {
953 size = parse_number(p + 1);
954 if (*p == ',') {
955 if (size < offset)
956 fatal("invalid range: %lu,%lu\n",
957 offset, size);
958 size -= offset;
959 }
960 }
961 } else {
962 offset = parse_number(optarg);
963 size = 1;
964 }
965
966 add_addr_range(offset, size);
967}
968
b7ed698c 969static void add_bits_filter(uint64_t mask, uint64_t bits)
35efa5e9
WF		 970{
971 if (nr_bit_filters >= MAX_BIT_FILTERS)
972 fatal("too much bit filters\n");
973
974 opt_mask[nr_bit_filters] = mask;
975 opt_bits[nr_bit_filters] = bits;
976 nr_bit_filters++;
977}
978
b7ed698c 979static uint64_t parse_flag_name(const char *str, int len)
35efa5e9 980{
e30d539b 981 size_t i;
35efa5e9
WF		 982
983 if (!*str || !len)
984 return 0;
985
986 if (len <= 8 && !strncmp(str, "compound", len))
987 return BITS_COMPOUND;
988
989 for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
990 if (!page_flag_names[i])
991 continue;
992 if (!strncmp(str, page_flag_names[i] + 2, len))
993 return 1ULL << i;
994 }
995
996 return parse_number(str);
997}
998
b7ed698c 999static uint64_t parse_flag_names(const char *str, int all)
35efa5e9
WF		 1000{
1001 const char *p = str;
1002 uint64_t flags = 0;
1003
1004 while (1) {
1005 if (*p == ',' || *p == '=' || *p == '\0') {
1006 if ((*str != '~') || (*str == '~' && all && *++str))
1007 flags |= parse_flag_name(str, p - str);
1008 if (*p != ',')
1009 break;
1010 str = p + 1;
1011 }
1012 p++;
1013 }
1014
1015 return flags;
1016}
1017
b7ed698c 1018static void parse_bits_mask(const char *optarg)
35efa5e9
WF		 1019{
1020 uint64_t mask;
1021 uint64_t bits;
1022 const char *p;
1023
1024 p = strchr(optarg, '=');
1025 if (p == optarg) {
1026 mask = KPF_ALL_BITS;
1027 bits = parse_flag_names(p + 1, 0);
1028 } else if (p) {
1029 mask = parse_flag_names(optarg, 0);
1030 bits = parse_flag_names(p + 1, 0);
1031 } else if (strchr(optarg, '~')) {
1032 mask = parse_flag_names(optarg, 1);
1033 bits = parse_flag_names(optarg, 0);
1034 } else {
1035 mask = parse_flag_names(optarg, 0);
1036 bits = KPF_ALL_BITS;
1037 }
1038
1039 add_bits_filter(mask, bits);
1040}
1041
dcfe730c
AC		 1042static void describe_flags(const char *optarg)
1043{
1044 uint64_t flags = parse_flag_names(optarg, 0);
1045
1046 printf("0x%016llx\t%s\t%s\n",
1047 (unsigned long long)flags,
1048 page_flag_name(flags),
1049 page_flag_longname(flags));
1050}
35efa5e9 1051
3428838d 1052static const struct option opts[] = {
35efa5e9
WF		 1053 { "raw" , 0, NULL, 'r' },
1054 { "pid" , 1, NULL, 'p' },
1055 { "file" , 1, NULL, 'f' },
1056 { "addr" , 1, NULL, 'a' },
1057 { "bits" , 1, NULL, 'b' },
dcfe730c 1058 { "describe" , 1, NULL, 'd' },
35efa5e9
WF		 1059 { "list" , 0, NULL, 'l' },
1060 { "list-each" , 0, NULL, 'L' },
1061 { "no-summary", 0, NULL, 'N' },
a54fed9f
WF		 1062 { "hwpoison" , 0, NULL, 'X' },
1063 { "unpoison" , 0, NULL, 'x' },
35efa5e9
WF		 1064 { "help" , 0, NULL, 'h' },
1065 { NULL , 0, NULL, 0 }
1066};
1067
1068int main(int argc, char *argv[])
1069{
1070 int c;
1071
1072 page_size = getpagesize();
1073
1074 while ((c = getopt_long(argc, argv,
dcfe730c 1075 "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
35efa5e9
WF		 1076 switch (c) {
1077 case 'r':
1078 opt_raw = 1;
1079 break;
1080 case 'p':
1081 parse_pid(optarg);
1082 break;
1083 case 'f':
1084 parse_file(optarg);
1085 break;
1086 case 'a':
1087 parse_addr_range(optarg);
1088 break;
1089 case 'b':
1090 parse_bits_mask(optarg);
1091 break;
dcfe730c 1092 case 'd':
dcfe730c 1093 describe_flags(optarg);
bb86a733 1094 exit(0);
35efa5e9
WF		 1095 case 'l':
1096 opt_list = 1;
1097 break;
1098 case 'L':
1099 opt_list = 2;
1100 break;
1101 case 'N':
1102 opt_no_summary = 1;
1103 break;
a54fed9f
WF		 1104 case 'X':
1105 opt_hwpoison = 1;
1106 prepare_hwpoison_fd();
1107 break;
1108 case 'x':
1109 opt_unpoison = 1;
1110 prepare_hwpoison_fd();
1111 break;
35efa5e9
WF		 1112 case 'h':
1113 usage();
1114 exit(0);
1115 default:
1116 usage();
1117 exit(1);
1118 }
1119 }
1120
0b4b2ad5
WF		 1121 if (opt_list && opt_pid)
1122 printf("voffset\t");
65a6a410
KK		 1123 if (opt_list && opt_file)
1124 printf("foffset\t");
35efa5e9 1125 if (opt_list == 1)
0b4b2ad5 1126 printf("offset\tlen\tflags\n");
35efa5e9
WF		 1127 if (opt_list == 2)
1128 printf("offset\tflags\n");
1129
65a6a410
KK		 1130 if (opt_file)
1131 walk_page_cache();
1132 else
1133 walk_addr_ranges();
35efa5e9
WF		 1134
1135 if (opt_list == 1)
65a6a410 1136 flush_page_range();
35efa5e9
WF		 1137
1138 if (opt_no_summary)
1139 return 0;
1140
1141 if (opt_list)
1142 printf("\n\n");
1143
1144 show_summary();
1145
1146 return 0;
1147}
Linux kernel - Deliverables
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