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-rw-r--r--Documentation/vm/Makefile2
-rw-r--r--Documentation/vm/page-types.c1102
2 files changed, 1 insertions, 1103 deletions
diff --git a/Documentation/vm/Makefile b/Documentation/vm/Makefile
index 3fa4d0668864..e538864bfc63 100644
--- a/Documentation/vm/Makefile
+++ b/Documentation/vm/Makefile
@@ -2,7 +2,7 @@
2obj- := dummy.o 2obj- := dummy.o
3 3
4# List of programs to build 4# List of programs to build
5hostprogs-y := page-types hugepage-mmap hugepage-shm map_hugetlb 5hostprogs-y := hugepage-mmap hugepage-shm map_hugetlb
6 6
7# Tell kbuild to always build the programs 7# Tell kbuild to always build the programs
8always := $(hostprogs-y) 8always := $(hostprogs-y)
diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
deleted file mode 100644
index 0b13f02d4059..000000000000
--- a/Documentation/vm/page-types.c
+++ /dev/null
@@ -1,1102 +0,0 @@
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/linux/magic.h"
38
39
40#ifndef MAX_PATH
41# define MAX_PATH 256
42#endif
43
44#ifndef STR
45# define _STR(x) #x
46# define STR(x) _STR(x)
47#endif
48
49/*
50 * pagemap kernel ABI bits
51 */
52
53#define PM_ENTRY_BYTES sizeof(uint64_t)
54#define PM_STATUS_BITS 3
55#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
56#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
57#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
58#define PM_PSHIFT_BITS 6
59#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
60#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
61#define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
62#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
63#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
64
65#define PM_PRESENT PM_STATUS(4LL)
66#define PM_SWAP PM_STATUS(2LL)
67
68
69/*
70 * kernel page flags
71 */
72
73#define KPF_BYTES 8
74#define PROC_KPAGEFLAGS "/proc/kpageflags"
75
76/* copied from kpageflags_read() */
77#define KPF_LOCKED 0
78#define KPF_ERROR 1
79#define KPF_REFERENCED 2
80#define KPF_UPTODATE 3
81#define KPF_DIRTY 4
82#define KPF_LRU 5
83#define KPF_ACTIVE 6
84#define KPF_SLAB 7
85#define KPF_WRITEBACK 8
86#define KPF_RECLAIM 9
87#define KPF_BUDDY 10
88
89/* [11-20] new additions in 2.6.31 */
90#define KPF_MMAP 11
91#define KPF_ANON 12
92#define KPF_SWAPCACHE 13
93#define KPF_SWAPBACKED 14
94#define KPF_COMPOUND_HEAD 15
95#define KPF_COMPOUND_TAIL 16
96#define KPF_HUGE 17
97#define KPF_UNEVICTABLE 18
98#define KPF_HWPOISON 19
99#define KPF_NOPAGE 20
100#define KPF_KSM 21
101#define KPF_THP 22
102
103/* [32-] kernel hacking assistances */
104#define KPF_RESERVED 32
105#define KPF_MLOCKED 33
106#define KPF_MAPPEDTODISK 34
107#define KPF_PRIVATE 35
108#define KPF_PRIVATE_2 36
109#define KPF_OWNER_PRIVATE 37
110#define KPF_ARCH 38
111#define KPF_UNCACHED 39
112
113/* [48-] take some arbitrary free slots for expanding overloaded flags
114 * not part of kernel API
115 */
116#define KPF_READAHEAD 48
117#define KPF_SLOB_FREE 49
118#define KPF_SLUB_FROZEN 50
119#define KPF_SLUB_DEBUG 51
120
121#define KPF_ALL_BITS ((uint64_t)~0ULL)
122#define KPF_HACKERS_BITS (0xffffULL << 32)
123#define KPF_OVERLOADED_BITS (0xffffULL << 48)
124#define BIT(name) (1ULL << KPF_##name)
125#define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
126
127static const char *page_flag_names[] = {
128 [KPF_LOCKED] = "L:locked",
129 [KPF_ERROR] = "E:error",
130 [KPF_REFERENCED] = "R:referenced",
131 [KPF_UPTODATE] = "U:uptodate",
132 [KPF_DIRTY] = "D:dirty",
133 [KPF_LRU] = "l:lru",
134 [KPF_ACTIVE] = "A:active",
135 [KPF_SLAB] = "S:slab",
136 [KPF_WRITEBACK] = "W:writeback",
137 [KPF_RECLAIM] = "I:reclaim",
138 [KPF_BUDDY] = "B:buddy",
139
140 [KPF_MMAP] = "M:mmap",
141 [KPF_ANON] = "a:anonymous",
142 [KPF_SWAPCACHE] = "s:swapcache",
143 [KPF_SWAPBACKED] = "b:swapbacked",
144 [KPF_COMPOUND_HEAD] = "H:compound_head",
145 [KPF_COMPOUND_TAIL] = "T:compound_tail",
146 [KPF_HUGE] = "G:huge",
147 [KPF_UNEVICTABLE] = "u:unevictable",
148 [KPF_HWPOISON] = "X:hwpoison",
149 [KPF_NOPAGE] = "n:nopage",
150 [KPF_KSM] = "x:ksm",
151 [KPF_THP] = "t:thp",
152
153 [KPF_RESERVED] = "r:reserved",
154 [KPF_MLOCKED] = "m:mlocked",
155 [KPF_MAPPEDTODISK] = "d:mappedtodisk",
156 [KPF_PRIVATE] = "P:private",
157 [KPF_PRIVATE_2] = "p:private_2",
158 [KPF_OWNER_PRIVATE] = "O:owner_private",
159 [KPF_ARCH] = "h:arch",
160 [KPF_UNCACHED] = "c:uncached",
161
162 [KPF_READAHEAD] = "I:readahead",
163 [KPF_SLOB_FREE] = "P:slob_free",
164 [KPF_SLUB_FROZEN] = "A:slub_frozen",
165 [KPF_SLUB_DEBUG] = "E:slub_debug",
166};
167
168
169static const char *debugfs_known_mountpoints[] = {
170 "/sys/kernel/debug",
171 "/debug",
172 0,
173};
174
175/*
176 * data structures
177 */
178
179static int opt_raw; /* for kernel developers */
180static int opt_list; /* list pages (in ranges) */
181static int opt_no_summary; /* don't show summary */
182static pid_t opt_pid; /* process to walk */
183
184#define MAX_ADDR_RANGES 1024
185static int nr_addr_ranges;
186static unsigned long opt_offset[MAX_ADDR_RANGES];
187static unsigned long opt_size[MAX_ADDR_RANGES];
188
189#define MAX_VMAS 10240
190static int nr_vmas;
191static unsigned long pg_start[MAX_VMAS];
192static unsigned long pg_end[MAX_VMAS];
193
194#define MAX_BIT_FILTERS 64
195static int nr_bit_filters;
196static uint64_t opt_mask[MAX_BIT_FILTERS];
197static uint64_t opt_bits[MAX_BIT_FILTERS];
198
199static int page_size;
200
201static int pagemap_fd;
202static int kpageflags_fd;
203
204static int opt_hwpoison;
205static int opt_unpoison;
206
207static char hwpoison_debug_fs[MAX_PATH+1];
208static int hwpoison_inject_fd;
209static int hwpoison_forget_fd;
210
211#define HASH_SHIFT 13
212#define HASH_SIZE (1 << HASH_SHIFT)
213#define HASH_MASK (HASH_SIZE - 1)
214#define HASH_KEY(flags) (flags & HASH_MASK)
215
216static unsigned long total_pages;
217static unsigned long nr_pages[HASH_SIZE];
218static uint64_t page_flags[HASH_SIZE];
219
220
221/*
222 * helper functions
223 */
224
225#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
226
227#define min_t(type, x, y) ({ \
228 type __min1 = (x); \
229 type __min2 = (y); \
230 __min1 < __min2 ? __min1 : __min2; })
231
232#define max_t(type, x, y) ({ \
233 type __max1 = (x); \
234 type __max2 = (y); \
235 __max1 > __max2 ? __max1 : __max2; })
236
237static unsigned long pages2mb(unsigned long pages)
238{
239 return (pages * page_size) >> 20;
240}
241
242static void fatal(const char *x, ...)
243{
244 va_list ap;
245
246 va_start(ap, x);
247 vfprintf(stderr, x, ap);
248 va_end(ap);
249 exit(EXIT_FAILURE);
250}
251
252static int checked_open(const char *pathname, int flags)
253{
254 int fd = open(pathname, flags);
255
256 if (fd < 0) {
257 perror(pathname);
258 exit(EXIT_FAILURE);
259 }
260
261 return fd;
262}
263
264/*
265 * pagemap/kpageflags routines
266 */
267
268static unsigned long do_u64_read(int fd, char *name,
269 uint64_t *buf,
270 unsigned long index,
271 unsigned long count)
272{
273 long bytes;
274
275 if (index > ULONG_MAX / 8)
276 fatal("index overflow: %lu\n", index);
277
278 if (lseek(fd, index * 8, SEEK_SET) < 0) {
279 perror(name);
280 exit(EXIT_FAILURE);
281 }
282
283 bytes = read(fd, buf, count * 8);
284 if (bytes < 0) {
285 perror(name);
286 exit(EXIT_FAILURE);
287 }
288 if (bytes % 8)
289 fatal("partial read: %lu bytes\n", bytes);
290
291 return bytes / 8;
292}
293
294static unsigned long kpageflags_read(uint64_t *buf,
295 unsigned long index,
296 unsigned long pages)
297{
298 return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
299}
300
301static unsigned long pagemap_read(uint64_t *buf,
302 unsigned long index,
303 unsigned long pages)
304{
305 return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
306}
307
308static unsigned long pagemap_pfn(uint64_t val)
309{
310 unsigned long pfn;
311
312 if (val & PM_PRESENT)
313 pfn = PM_PFRAME(val);
314 else
315 pfn = 0;
316
317 return pfn;
318}
319
320
321/*
322 * page flag names
323 */
324
325static char *page_flag_name(uint64_t flags)
326{
327 static char buf[65];
328 int present;
329 int i, j;
330
331 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
332 present = (flags >> i) & 1;
333 if (!page_flag_names[i]) {
334 if (present)
335 fatal("unknown flag bit %d\n", i);
336 continue;
337 }
338 buf[j++] = present ? page_flag_names[i][0] : '_';
339 }
340
341 return buf;
342}
343
344static char *page_flag_longname(uint64_t flags)
345{
346 static char buf[1024];
347 int i, n;
348
349 for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
350 if (!page_flag_names[i])
351 continue;
352 if ((flags >> i) & 1)
353 n += snprintf(buf + n, sizeof(buf) - n, "%s,",
354 page_flag_names[i] + 2);
355 }
356 if (n)
357 n--;
358 buf[n] = '\0';
359
360 return buf;
361}
362
363
364/*
365 * page list and summary
366 */
367
368static void show_page_range(unsigned long voffset,
369 unsigned long offset, uint64_t flags)
370{
371 static uint64_t flags0;
372 static unsigned long voff;
373 static unsigned long index;
374 static unsigned long count;
375
376 if (flags == flags0 && offset == index + count &&
377 (!opt_pid || voffset == voff + count)) {
378 count++;
379 return;
380 }
381
382 if (count) {
383 if (opt_pid)
384 printf("%lx\t", voff);
385 printf("%lx\t%lx\t%s\n",
386 index, count, page_flag_name(flags0));
387 }
388
389 flags0 = flags;
390 index = offset;
391 voff = voffset;
392 count = 1;
393}
394
395static void show_page(unsigned long voffset,
396 unsigned long offset, uint64_t flags)
397{
398 if (opt_pid)
399 printf("%lx\t", voffset);
400 printf("%lx\t%s\n", offset, page_flag_name(flags));
401}
402
403static void show_summary(void)
404{
405 int i;
406
407 printf(" flags\tpage-count MB"
408 " symbolic-flags\t\t\tlong-symbolic-flags\n");
409
410 for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
411 if (nr_pages[i])
412 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
413 (unsigned long long)page_flags[i],
414 nr_pages[i],
415 pages2mb(nr_pages[i]),
416 page_flag_name(page_flags[i]),
417 page_flag_longname(page_flags[i]));
418 }
419
420 printf(" total\t%10lu %8lu\n",
421 total_pages, pages2mb(total_pages));
422}
423
424
425/*
426 * page flag filters
427 */
428
429static int bit_mask_ok(uint64_t flags)
430{
431 int i;
432
433 for (i = 0; i < nr_bit_filters; i++) {
434 if (opt_bits[i] == KPF_ALL_BITS) {
435 if ((flags & opt_mask[i]) == 0)
436 return 0;
437 } else {
438 if ((flags & opt_mask[i]) != opt_bits[i])
439 return 0;
440 }
441 }
442
443 return 1;
444}
445
446static uint64_t expand_overloaded_flags(uint64_t flags)
447{
448 /* SLOB/SLUB overload several page flags */
449 if (flags & BIT(SLAB)) {
450 if (flags & BIT(PRIVATE))
451 flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
452 if (flags & BIT(ACTIVE))
453 flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
454 if (flags & BIT(ERROR))
455 flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
456 }
457
458 /* PG_reclaim is overloaded as PG_readahead in the read path */
459 if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
460 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
461
462 return flags;
463}
464
465static uint64_t well_known_flags(uint64_t flags)
466{
467 /* hide flags intended only for kernel hacker */
468 flags &= ~KPF_HACKERS_BITS;
469
470 /* hide non-hugeTLB compound pages */
471 if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
472 flags &= ~BITS_COMPOUND;
473
474 return flags;
475}
476
477static uint64_t kpageflags_flags(uint64_t flags)
478{
479 flags = expand_overloaded_flags(flags);
480
481 if (!opt_raw)
482 flags = well_known_flags(flags);
483
484 return flags;
485}
486
487/* verify that a mountpoint is actually a debugfs instance */
488static int debugfs_valid_mountpoint(const char *debugfs)
489{
490 struct statfs st_fs;
491
492 if (statfs(debugfs, &st_fs) < 0)
493 return -ENOENT;
494 else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
495 return -ENOENT;
496
497 return 0;
498}
499
500/* find the path to the mounted debugfs */
501static const char *debugfs_find_mountpoint(void)
502{
503 const char **ptr;
504 char type[100];
505 FILE *fp;
506
507 ptr = debugfs_known_mountpoints;
508 while (*ptr) {
509 if (debugfs_valid_mountpoint(*ptr) == 0) {
510 strcpy(hwpoison_debug_fs, *ptr);
511 return hwpoison_debug_fs;
512 }
513 ptr++;
514 }
515
516 /* give up and parse /proc/mounts */
517 fp = fopen("/proc/mounts", "r");
518 if (fp == NULL)
519 perror("Can't open /proc/mounts for read");
520
521 while (fscanf(fp, "%*s %"
522 STR(MAX_PATH)
523 "s %99s %*s %*d %*d\n",
524 hwpoison_debug_fs, type) == 2) {
525 if (strcmp(type, "debugfs") == 0)
526 break;
527 }
528 fclose(fp);
529
530 if (strcmp(type, "debugfs") != 0)
531 return NULL;
532
533 return hwpoison_debug_fs;
534}
535
536/* mount the debugfs somewhere if it's not mounted */
537
538static void debugfs_mount(void)
539{
540 const char **ptr;
541
542 /* see if it's already mounted */
543 if (debugfs_find_mountpoint())
544 return;
545
546 ptr = debugfs_known_mountpoints;
547 while (*ptr) {
548 if (mount(NULL, *ptr, "debugfs", 0, NULL) == 0) {
549 /* save the mountpoint */
550 strcpy(hwpoison_debug_fs, *ptr);
551 break;
552 }
553 ptr++;
554 }
555
556 if (*ptr == NULL) {
557 perror("mount debugfs");
558 exit(EXIT_FAILURE);
559 }
560}
561
562/*
563 * page actions
564 */
565
566static void prepare_hwpoison_fd(void)
567{
568 char buf[MAX_PATH + 1];
569
570 debugfs_mount();
571
572 if (opt_hwpoison && !hwpoison_inject_fd) {
573 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
574 hwpoison_debug_fs);
575 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
576 }
577
578 if (opt_unpoison && !hwpoison_forget_fd) {
579 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
580 hwpoison_debug_fs);
581 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
582 }
583}
584
585static int hwpoison_page(unsigned long offset)
586{
587 char buf[100];
588 int len;
589
590 len = sprintf(buf, "0x%lx\n", offset);
591 len = write(hwpoison_inject_fd, buf, len);
592 if (len < 0) {
593 perror("hwpoison inject");
594 return len;
595 }
596 return 0;
597}
598
599static int unpoison_page(unsigned long offset)
600{
601 char buf[100];
602 int len;
603
604 len = sprintf(buf, "0x%lx\n", offset);
605 len = write(hwpoison_forget_fd, buf, len);
606 if (len < 0) {
607 perror("hwpoison forget");
608 return len;
609 }
610 return 0;
611}
612
613/*
614 * page frame walker
615 */
616
617static int hash_slot(uint64_t flags)
618{
619 int k = HASH_KEY(flags);
620 int i;
621
622 /* Explicitly reserve slot 0 for flags 0: the following logic
623 * cannot distinguish an unoccupied slot from slot (flags==0).
624 */
625 if (flags == 0)
626 return 0;
627
628 /* search through the remaining (HASH_SIZE-1) slots */
629 for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
630 if (!k || k >= ARRAY_SIZE(page_flags))
631 k = 1;
632 if (page_flags[k] == 0) {
633 page_flags[k] = flags;
634 return k;
635 }
636 if (page_flags[k] == flags)
637 return k;
638 }
639
640 fatal("hash table full: bump up HASH_SHIFT?\n");
641 exit(EXIT_FAILURE);
642}
643
644static void add_page(unsigned long voffset,
645 unsigned long offset, uint64_t flags)
646{
647 flags = kpageflags_flags(flags);
648
649 if (!bit_mask_ok(flags))
650 return;
651
652 if (opt_hwpoison)
653 hwpoison_page(offset);
654 if (opt_unpoison)
655 unpoison_page(offset);
656
657 if (opt_list == 1)
658 show_page_range(voffset, offset, flags);
659 else if (opt_list == 2)
660 show_page(voffset, offset, flags);
661
662 nr_pages[hash_slot(flags)]++;
663 total_pages++;
664}
665
666#define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
667static void walk_pfn(unsigned long voffset,
668 unsigned long index,
669 unsigned long count)
670{
671 uint64_t buf[KPAGEFLAGS_BATCH];
672 unsigned long batch;
673 long pages;
674 unsigned long i;
675
676 while (count) {
677 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
678 pages = kpageflags_read(buf, index, batch);
679 if (pages == 0)
680 break;
681
682 for (i = 0; i < pages; i++)
683 add_page(voffset + i, index + i, buf[i]);
684
685 index += pages;
686 count -= pages;
687 }
688}
689
690#define PAGEMAP_BATCH (64 << 10)
691static void walk_vma(unsigned long index, unsigned long count)
692{
693 uint64_t buf[PAGEMAP_BATCH];
694 unsigned long batch;
695 unsigned long pages;
696 unsigned long pfn;
697 unsigned long i;
698
699 while (count) {
700 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
701 pages = pagemap_read(buf, index, batch);
702 if (pages == 0)
703 break;
704
705 for (i = 0; i < pages; i++) {
706 pfn = pagemap_pfn(buf[i]);
707 if (pfn)
708 walk_pfn(index + i, pfn, 1);
709 }
710
711 index += pages;
712 count -= pages;
713 }
714}
715
716static void walk_task(unsigned long index, unsigned long count)
717{
718 const unsigned long end = index + count;
719 unsigned long start;
720 int i = 0;
721
722 while (index < end) {
723
724 while (pg_end[i] <= index)
725 if (++i >= nr_vmas)
726 return;
727 if (pg_start[i] >= end)
728 return;
729
730 start = max_t(unsigned long, pg_start[i], index);
731 index = min_t(unsigned long, pg_end[i], end);
732
733 assert(start < index);
734 walk_vma(start, index - start);
735 }
736}
737
738static void add_addr_range(unsigned long offset, unsigned long size)
739{
740 if (nr_addr_ranges >= MAX_ADDR_RANGES)
741 fatal("too many addr ranges\n");
742
743 opt_offset[nr_addr_ranges] = offset;
744 opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
745 nr_addr_ranges++;
746}
747
748static void walk_addr_ranges(void)
749{
750 int i;
751
752 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
753
754 if (!nr_addr_ranges)
755 add_addr_range(0, ULONG_MAX);
756
757 for (i = 0; i < nr_addr_ranges; i++)
758 if (!opt_pid)
759 walk_pfn(0, opt_offset[i], opt_size[i]);
760 else
761 walk_task(opt_offset[i], opt_size[i]);
762
763 close(kpageflags_fd);
764}
765
766
767/*
768 * user interface
769 */
770
771static const char *page_flag_type(uint64_t flag)
772{
773 if (flag & KPF_HACKERS_BITS)
774 return "(r)";
775 if (flag & KPF_OVERLOADED_BITS)
776 return "(o)";
777 return " ";
778}
779
780static void usage(void)
781{
782 int i, j;
783
784 printf(
785"page-types [options]\n"
786" -r|--raw Raw mode, for kernel developers\n"
787" -d|--describe flags Describe flags\n"
788" -a|--addr addr-spec Walk a range of pages\n"
789" -b|--bits bits-spec Walk pages with specified bits\n"
790" -p|--pid pid Walk process address space\n"
791#if 0 /* planned features */
792" -f|--file filename Walk file address space\n"
793#endif
794" -l|--list Show page details in ranges\n"
795" -L|--list-each Show page details one by one\n"
796" -N|--no-summary Don't show summary info\n"
797" -X|--hwpoison hwpoison pages\n"
798" -x|--unpoison unpoison pages\n"
799" -h|--help Show this usage message\n"
800"flags:\n"
801" 0x10 bitfield format, e.g.\n"
802" anon bit-name, e.g.\n"
803" 0x10,anon comma-separated list, e.g.\n"
804"addr-spec:\n"
805" N one page at offset N (unit: pages)\n"
806" N+M pages range from N to N+M-1\n"
807" N,M pages range from N to M-1\n"
808" N, pages range from N to end\n"
809" ,M pages range from 0 to M-1\n"
810"bits-spec:\n"
811" bit1,bit2 (flags & (bit1|bit2)) != 0\n"
812" bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
813" bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
814" =bit1,bit2 flags == (bit1|bit2)\n"
815"bit-names:\n"
816 );
817
818 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
819 if (!page_flag_names[i])
820 continue;
821 printf("%16s%s", page_flag_names[i] + 2,
822 page_flag_type(1ULL << i));
823 if (++j > 3) {
824 j = 0;
825 putchar('\n');
826 }
827 }
828 printf("\n "
829 "(r) raw mode bits (o) overloaded bits\n");
830}
831
832static unsigned long long parse_number(const char *str)
833{
834 unsigned long long n;
835
836 n = strtoll(str, NULL, 0);
837
838 if (n == 0 && str[0] != '0')
839 fatal("invalid name or number: %s\n", str);
840
841 return n;
842}
843
844static void parse_pid(const char *str)
845{
846 FILE *file;
847 char buf[5000];
848
849 opt_pid = parse_number(str);
850
851 sprintf(buf, "/proc/%d/pagemap", opt_pid);
852 pagemap_fd = checked_open(buf, O_RDONLY);
853
854 sprintf(buf, "/proc/%d/maps", opt_pid);
855 file = fopen(buf, "r");
856 if (!file) {
857 perror(buf);
858 exit(EXIT_FAILURE);
859 }
860
861 while (fgets(buf, sizeof(buf), file) != NULL) {
862 unsigned long vm_start;
863 unsigned long vm_end;
864 unsigned long long pgoff;
865 int major, minor;
866 char r, w, x, s;
867 unsigned long ino;
868 int n;
869
870 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
871 &vm_start,
872 &vm_end,
873 &r, &w, &x, &s,
874 &pgoff,
875 &major, &minor,
876 &ino);
877 if (n < 10) {
878 fprintf(stderr, "unexpected line: %s\n", buf);
879 continue;
880 }
881 pg_start[nr_vmas] = vm_start / page_size;
882 pg_end[nr_vmas] = vm_end / page_size;
883 if (++nr_vmas >= MAX_VMAS) {
884 fprintf(stderr, "too many VMAs\n");
885 break;
886 }
887 }
888 fclose(file);
889}
890
891static void parse_file(const char *name)
892{
893}
894
895static void parse_addr_range(const char *optarg)
896{
897 unsigned long offset;
898 unsigned long size;
899 char *p;
900
901 p = strchr(optarg, ',');
902 if (!p)
903 p = strchr(optarg, '+');
904
905 if (p == optarg) {
906 offset = 0;
907 size = parse_number(p + 1);
908 } else if (p) {
909 offset = parse_number(optarg);
910 if (p[1] == '\0')
911 size = ULONG_MAX;
912 else {
913 size = parse_number(p + 1);
914 if (*p == ',') {
915 if (size < offset)
916 fatal("invalid range: %lu,%lu\n",
917 offset, size);
918 size -= offset;
919 }
920 }
921 } else {
922 offset = parse_number(optarg);
923 size = 1;
924 }
925
926 add_addr_range(offset, size);
927}
928
929static void add_bits_filter(uint64_t mask, uint64_t bits)
930{
931 if (nr_bit_filters >= MAX_BIT_FILTERS)
932 fatal("too much bit filters\n");
933
934 opt_mask[nr_bit_filters] = mask;
935 opt_bits[nr_bit_filters] = bits;
936 nr_bit_filters++;
937}
938
939static uint64_t parse_flag_name(const char *str, int len)
940{
941 int i;
942
943 if (!*str || !len)
944 return 0;
945
946 if (len <= 8 && !strncmp(str, "compound", len))
947 return BITS_COMPOUND;
948
949 for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
950 if (!page_flag_names[i])
951 continue;
952 if (!strncmp(str, page_flag_names[i] + 2, len))
953 return 1ULL << i;
954 }
955
956 return parse_number(str);
957}
958
959static uint64_t parse_flag_names(const char *str, int all)
960{
961 const char *p = str;
962 uint64_t flags = 0;
963
964 while (1) {
965 if (*p == ',' || *p == '=' || *p == '\0') {
966 if ((*str != '~') || (*str == '~' && all && *++str))
967 flags |= parse_flag_name(str, p - str);
968 if (*p != ',')
969 break;
970 str = p + 1;
971 }
972 p++;
973 }
974
975 return flags;
976}
977
978static void parse_bits_mask(const char *optarg)
979{
980 uint64_t mask;
981 uint64_t bits;
982 const char *p;
983
984 p = strchr(optarg, '=');
985 if (p == optarg) {
986 mask = KPF_ALL_BITS;
987 bits = parse_flag_names(p + 1, 0);
988 } else if (p) {
989 mask = parse_flag_names(optarg, 0);
990 bits = parse_flag_names(p + 1, 0);
991 } else if (strchr(optarg, '~')) {
992 mask = parse_flag_names(optarg, 1);
993 bits = parse_flag_names(optarg, 0);
994 } else {
995 mask = parse_flag_names(optarg, 0);
996 bits = KPF_ALL_BITS;
997 }
998
999 add_bits_filter(mask, bits);
1000}
1001
1002static void describe_flags(const char *optarg)
1003{
1004 uint64_t flags = parse_flag_names(optarg, 0);
1005
1006 printf("0x%016llx\t%s\t%s\n",
1007 (unsigned long long)flags,
1008 page_flag_name(flags),
1009 page_flag_longname(flags));
1010}
1011
1012static const struct option opts[] = {
1013 { "raw" , 0, NULL, 'r' },
1014 { "pid" , 1, NULL, 'p' },
1015 { "file" , 1, NULL, 'f' },
1016 { "addr" , 1, NULL, 'a' },
1017 { "bits" , 1, NULL, 'b' },
1018 { "describe" , 1, NULL, 'd' },
1019 { "list" , 0, NULL, 'l' },
1020 { "list-each" , 0, NULL, 'L' },
1021 { "no-summary", 0, NULL, 'N' },
1022 { "hwpoison" , 0, NULL, 'X' },
1023 { "unpoison" , 0, NULL, 'x' },
1024 { "help" , 0, NULL, 'h' },
1025 { NULL , 0, NULL, 0 }
1026};
1027
1028int main(int argc, char *argv[])
1029{
1030 int c;
1031
1032 page_size = getpagesize();
1033
1034 while ((c = getopt_long(argc, argv,
1035 "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
1036 switch (c) {
1037 case 'r':
1038 opt_raw = 1;
1039 break;
1040 case 'p':
1041 parse_pid(optarg);
1042 break;
1043 case 'f':
1044 parse_file(optarg);
1045 break;
1046 case 'a':
1047 parse_addr_range(optarg);
1048 break;
1049 case 'b':
1050 parse_bits_mask(optarg);
1051 break;
1052 case 'd':
1053 describe_flags(optarg);
1054 exit(0);
1055 case 'l':
1056 opt_list = 1;
1057 break;
1058 case 'L':
1059 opt_list = 2;
1060 break;
1061 case 'N':
1062 opt_no_summary = 1;
1063 break;
1064 case 'X':
1065 opt_hwpoison = 1;
1066 prepare_hwpoison_fd();
1067 break;
1068 case 'x':
1069 opt_unpoison = 1;
1070 prepare_hwpoison_fd();
1071 break;
1072 case 'h':
1073 usage();
1074 exit(0);
1075 default:
1076 usage();
1077 exit(1);
1078 }
1079 }
1080
1081 if (opt_list && opt_pid)
1082 printf("voffset\t");
1083 if (opt_list == 1)
1084 printf("offset\tlen\tflags\n");
1085 if (opt_list == 2)
1086 printf("offset\tflags\n");
1087
1088 walk_addr_ranges();
1089
1090 if (opt_list == 1)
1091 show_page_range(0, 0, 0); /* drain the buffer */
1092
1093 if (opt_no_summary)
1094 return 0;
1095
1096 if (opt_list)
1097 printf("\n\n");
1098
1099 show_summary();
1100
1101 return 0;
1102}
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