Commit | Line | Data |
---|---|---|
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 | ||
0b4b2ad5 | 22 | #define _LARGEFILE64_SOURCE |
35efa5e9 WF |
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> | |
0b4b2ad5 | 31 | #include <assert.h> |
35efa5e9 WF |
32 | #include <sys/types.h> |
33 | #include <sys/errno.h> | |
34 | #include <sys/fcntl.h> | |
35 | ||
36 | ||
0b4b2ad5 WF |
37 | /* |
38 | * pagemap kernel ABI bits | |
39 | */ | |
40 | ||
41 | #define PM_ENTRY_BYTES sizeof(uint64_t) | |
42 | #define PM_STATUS_BITS 3 | |
43 | #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS) | |
44 | #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET) | |
45 | #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK) | |
46 | #define PM_PSHIFT_BITS 6 | |
47 | #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) | |
48 | #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET) | |
49 | #define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) | |
50 | #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1) | |
51 | #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) | |
52 | ||
53 | #define PM_PRESENT PM_STATUS(4LL) | |
54 | #define PM_SWAP PM_STATUS(2LL) | |
55 | ||
56 | ||
35efa5e9 WF |
57 | /* |
58 | * kernel page flags | |
59 | */ | |
60 | ||
61 | #define KPF_BYTES 8 | |
62 | #define PROC_KPAGEFLAGS "/proc/kpageflags" | |
63 | ||
64 | /* copied from kpageflags_read() */ | |
65 | #define KPF_LOCKED 0 | |
66 | #define KPF_ERROR 1 | |
67 | #define KPF_REFERENCED 2 | |
68 | #define KPF_UPTODATE 3 | |
69 | #define KPF_DIRTY 4 | |
70 | #define KPF_LRU 5 | |
71 | #define KPF_ACTIVE 6 | |
72 | #define KPF_SLAB 7 | |
73 | #define KPF_WRITEBACK 8 | |
74 | #define KPF_RECLAIM 9 | |
75 | #define KPF_BUDDY 10 | |
76 | ||
77 | /* [11-20] new additions in 2.6.31 */ | |
78 | #define KPF_MMAP 11 | |
79 | #define KPF_ANON 12 | |
80 | #define KPF_SWAPCACHE 13 | |
81 | #define KPF_SWAPBACKED 14 | |
82 | #define KPF_COMPOUND_HEAD 15 | |
83 | #define KPF_COMPOUND_TAIL 16 | |
84 | #define KPF_HUGE 17 | |
85 | #define KPF_UNEVICTABLE 18 | |
253fb02d | 86 | #define KPF_HWPOISON 19 |
35efa5e9 | 87 | #define KPF_NOPAGE 20 |
a1bbb5ec | 88 | #define KPF_KSM 21 |
35efa5e9 WF |
89 | |
90 | /* [32-] kernel hacking assistances */ | |
91 | #define KPF_RESERVED 32 | |
92 | #define KPF_MLOCKED 33 | |
93 | #define KPF_MAPPEDTODISK 34 | |
94 | #define KPF_PRIVATE 35 | |
95 | #define KPF_PRIVATE_2 36 | |
96 | #define KPF_OWNER_PRIVATE 37 | |
97 | #define KPF_ARCH 38 | |
98 | #define KPF_UNCACHED 39 | |
99 | ||
100 | /* [48-] take some arbitrary free slots for expanding overloaded flags | |
101 | * not part of kernel API | |
102 | */ | |
103 | #define KPF_READAHEAD 48 | |
104 | #define KPF_SLOB_FREE 49 | |
105 | #define KPF_SLUB_FROZEN 50 | |
106 | #define KPF_SLUB_DEBUG 51 | |
107 | ||
108 | #define KPF_ALL_BITS ((uint64_t)~0ULL) | |
109 | #define KPF_HACKERS_BITS (0xffffULL << 32) | |
110 | #define KPF_OVERLOADED_BITS (0xffffULL << 48) | |
111 | #define BIT(name) (1ULL << KPF_##name) | |
112 | #define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL)) | |
113 | ||
3428838d | 114 | static const char *page_flag_names[] = { |
35efa5e9 WF |
115 | [KPF_LOCKED] = "L:locked", |
116 | [KPF_ERROR] = "E:error", | |
117 | [KPF_REFERENCED] = "R:referenced", | |
118 | [KPF_UPTODATE] = "U:uptodate", | |
119 | [KPF_DIRTY] = "D:dirty", | |
120 | [KPF_LRU] = "l:lru", | |
121 | [KPF_ACTIVE] = "A:active", | |
122 | [KPF_SLAB] = "S:slab", | |
123 | [KPF_WRITEBACK] = "W:writeback", | |
124 | [KPF_RECLAIM] = "I:reclaim", | |
125 | [KPF_BUDDY] = "B:buddy", | |
126 | ||
127 | [KPF_MMAP] = "M:mmap", | |
128 | [KPF_ANON] = "a:anonymous", | |
129 | [KPF_SWAPCACHE] = "s:swapcache", | |
130 | [KPF_SWAPBACKED] = "b:swapbacked", | |
131 | [KPF_COMPOUND_HEAD] = "H:compound_head", | |
132 | [KPF_COMPOUND_TAIL] = "T:compound_tail", | |
133 | [KPF_HUGE] = "G:huge", | |
134 | [KPF_UNEVICTABLE] = "u:unevictable", | |
253fb02d | 135 | [KPF_HWPOISON] = "X:hwpoison", |
35efa5e9 | 136 | [KPF_NOPAGE] = "n:nopage", |
a1bbb5ec | 137 | [KPF_KSM] = "x:ksm", |
35efa5e9 WF |
138 | |
139 | [KPF_RESERVED] = "r:reserved", | |
140 | [KPF_MLOCKED] = "m:mlocked", | |
141 | [KPF_MAPPEDTODISK] = "d:mappedtodisk", | |
142 | [KPF_PRIVATE] = "P:private", | |
143 | [KPF_PRIVATE_2] = "p:private_2", | |
144 | [KPF_OWNER_PRIVATE] = "O:owner_private", | |
145 | [KPF_ARCH] = "h:arch", | |
146 | [KPF_UNCACHED] = "c:uncached", | |
147 | ||
148 | [KPF_READAHEAD] = "I:readahead", | |
149 | [KPF_SLOB_FREE] = "P:slob_free", | |
150 | [KPF_SLUB_FROZEN] = "A:slub_frozen", | |
151 | [KPF_SLUB_DEBUG] = "E:slub_debug", | |
152 | }; | |
153 | ||
154 | ||
155 | /* | |
156 | * data structures | |
157 | */ | |
158 | ||
159 | static int opt_raw; /* for kernel developers */ | |
160 | static int opt_list; /* list pages (in ranges) */ | |
161 | static int opt_no_summary; /* don't show summary */ | |
162 | static pid_t opt_pid; /* process to walk */ | |
163 | ||
164 | #define MAX_ADDR_RANGES 1024 | |
165 | static int nr_addr_ranges; | |
166 | static unsigned long opt_offset[MAX_ADDR_RANGES]; | |
167 | static unsigned long opt_size[MAX_ADDR_RANGES]; | |
168 | ||
0b4b2ad5 WF |
169 | #define MAX_VMAS 10240 |
170 | static int nr_vmas; | |
171 | static unsigned long pg_start[MAX_VMAS]; | |
172 | static unsigned long pg_end[MAX_VMAS]; | |
0b4b2ad5 | 173 | |
35efa5e9 WF |
174 | #define MAX_BIT_FILTERS 64 |
175 | static int nr_bit_filters; | |
176 | static uint64_t opt_mask[MAX_BIT_FILTERS]; | |
177 | static uint64_t opt_bits[MAX_BIT_FILTERS]; | |
178 | ||
179 | static int page_size; | |
180 | ||
4a1b6726 | 181 | static int pagemap_fd; |
35efa5e9 | 182 | static int kpageflags_fd; |
35efa5e9 | 183 | |
a54fed9f WF |
184 | static int opt_hwpoison; |
185 | static int opt_unpoison; | |
186 | ||
3428838d | 187 | static const char hwpoison_debug_fs[] = "/debug/hwpoison"; |
a54fed9f WF |
188 | static int hwpoison_inject_fd; |
189 | static int hwpoison_forget_fd; | |
190 | ||
35efa5e9 WF |
191 | #define HASH_SHIFT 13 |
192 | #define HASH_SIZE (1 << HASH_SHIFT) | |
193 | #define HASH_MASK (HASH_SIZE - 1) | |
194 | #define HASH_KEY(flags) (flags & HASH_MASK) | |
195 | ||
196 | static unsigned long total_pages; | |
197 | static unsigned long nr_pages[HASH_SIZE]; | |
198 | static uint64_t page_flags[HASH_SIZE]; | |
199 | ||
200 | ||
201 | /* | |
202 | * helper functions | |
203 | */ | |
204 | ||
205 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) | |
206 | ||
207 | #define min_t(type, x, y) ({ \ | |
208 | type __min1 = (x); \ | |
209 | type __min2 = (y); \ | |
210 | __min1 < __min2 ? __min1 : __min2; }) | |
211 | ||
0b4b2ad5 WF |
212 | #define max_t(type, x, y) ({ \ |
213 | type __max1 = (x); \ | |
214 | type __max2 = (y); \ | |
215 | __max1 > __max2 ? __max1 : __max2; }) | |
216 | ||
b7ed698c | 217 | static unsigned long pages2mb(unsigned long pages) |
35efa5e9 WF |
218 | { |
219 | return (pages * page_size) >> 20; | |
220 | } | |
221 | ||
b7ed698c | 222 | static void fatal(const char *x, ...) |
35efa5e9 WF |
223 | { |
224 | va_list ap; | |
225 | ||
226 | va_start(ap, x); | |
227 | vfprintf(stderr, x, ap); | |
228 | va_end(ap); | |
229 | exit(EXIT_FAILURE); | |
230 | } | |
231 | ||
1b98c00b | 232 | static int checked_open(const char *pathname, int flags) |
31bbf66e WF |
233 | { |
234 | int fd = open(pathname, flags); | |
235 | ||
236 | if (fd < 0) { | |
237 | perror(pathname); | |
238 | exit(EXIT_FAILURE); | |
239 | } | |
240 | ||
241 | return fd; | |
242 | } | |
243 | ||
4a1b6726 WF |
244 | /* |
245 | * pagemap/kpageflags routines | |
246 | */ | |
247 | ||
248 | static unsigned long do_u64_read(int fd, char *name, | |
249 | uint64_t *buf, | |
250 | unsigned long index, | |
251 | unsigned long count) | |
252 | { | |
253 | long bytes; | |
254 | ||
255 | if (index > ULONG_MAX / 8) | |
256 | fatal("index overflow: %lu\n", index); | |
257 | ||
258 | if (lseek(fd, index * 8, SEEK_SET) < 0) { | |
259 | perror(name); | |
260 | exit(EXIT_FAILURE); | |
261 | } | |
262 | ||
263 | bytes = read(fd, buf, count * 8); | |
264 | if (bytes < 0) { | |
265 | perror(name); | |
266 | exit(EXIT_FAILURE); | |
267 | } | |
268 | if (bytes % 8) | |
269 | fatal("partial read: %lu bytes\n", bytes); | |
270 | ||
271 | return bytes / 8; | |
272 | } | |
273 | ||
274 | static unsigned long kpageflags_read(uint64_t *buf, | |
275 | unsigned long index, | |
276 | unsigned long pages) | |
277 | { | |
278 | return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages); | |
279 | } | |
280 | ||
281 | static unsigned long pagemap_read(uint64_t *buf, | |
282 | unsigned long index, | |
283 | unsigned long pages) | |
284 | { | |
285 | return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages); | |
286 | } | |
287 | ||
288 | static unsigned long pagemap_pfn(uint64_t val) | |
289 | { | |
290 | unsigned long pfn; | |
291 | ||
292 | if (val & PM_PRESENT) | |
293 | pfn = PM_PFRAME(val); | |
294 | else | |
295 | pfn = 0; | |
296 | ||
297 | return pfn; | |
298 | } | |
299 | ||
35efa5e9 WF |
300 | |
301 | /* | |
302 | * page flag names | |
303 | */ | |
304 | ||
b7ed698c | 305 | static char *page_flag_name(uint64_t flags) |
35efa5e9 WF |
306 | { |
307 | static char buf[65]; | |
308 | int present; | |
309 | int i, j; | |
310 | ||
311 | for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) { | |
312 | present = (flags >> i) & 1; | |
313 | if (!page_flag_names[i]) { | |
314 | if (present) | |
af901ca1 | 315 | fatal("unknown flag bit %d\n", i); |
35efa5e9 WF |
316 | continue; |
317 | } | |
318 | buf[j++] = present ? page_flag_names[i][0] : '_'; | |
319 | } | |
320 | ||
321 | return buf; | |
322 | } | |
323 | ||
b7ed698c | 324 | static char *page_flag_longname(uint64_t flags) |
35efa5e9 WF |
325 | { |
326 | static char buf[1024]; | |
327 | int i, n; | |
328 | ||
329 | for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) { | |
330 | if (!page_flag_names[i]) | |
331 | continue; | |
332 | if ((flags >> i) & 1) | |
333 | n += snprintf(buf + n, sizeof(buf) - n, "%s,", | |
334 | page_flag_names[i] + 2); | |
335 | } | |
336 | if (n) | |
337 | n--; | |
338 | buf[n] = '\0'; | |
339 | ||
340 | return buf; | |
341 | } | |
342 | ||
343 | ||
344 | /* | |
345 | * page list and summary | |
346 | */ | |
347 | ||
e577ebde WF |
348 | static void show_page_range(unsigned long voffset, |
349 | unsigned long offset, uint64_t flags) | |
35efa5e9 WF |
350 | { |
351 | static uint64_t flags0; | |
0b4b2ad5 | 352 | static unsigned long voff; |
35efa5e9 WF |
353 | static unsigned long index; |
354 | static unsigned long count; | |
355 | ||
0b4b2ad5 WF |
356 | if (flags == flags0 && offset == index + count && |
357 | (!opt_pid || voffset == voff + count)) { | |
35efa5e9 WF |
358 | count++; |
359 | return; | |
360 | } | |
361 | ||
0b4b2ad5 WF |
362 | if (count) { |
363 | if (opt_pid) | |
364 | printf("%lx\t", voff); | |
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; |
35efa5e9 WF |
372 | count = 1; |
373 | } | |
374 | ||
e577ebde WF |
375 | static void show_page(unsigned long voffset, |
376 | unsigned long offset, uint64_t flags) | |
35efa5e9 | 377 | { |
0b4b2ad5 WF |
378 | if (opt_pid) |
379 | printf("%lx\t", voffset); | |
380 | printf("%lx\t%s\n", offset, page_flag_name(flags)); | |
35efa5e9 WF |
381 | } |
382 | ||
b7ed698c | 383 | static void show_summary(void) |
35efa5e9 WF |
384 | { |
385 | int i; | |
386 | ||
387 | printf(" flags\tpage-count MB" | |
388 | " symbolic-flags\t\t\tlong-symbolic-flags\n"); | |
389 | ||
390 | for (i = 0; i < ARRAY_SIZE(nr_pages); i++) { | |
391 | if (nr_pages[i]) | |
392 | printf("0x%016llx\t%10lu %8lu %s\t%s\n", | |
393 | (unsigned long long)page_flags[i], | |
394 | nr_pages[i], | |
395 | pages2mb(nr_pages[i]), | |
396 | page_flag_name(page_flags[i]), | |
397 | page_flag_longname(page_flags[i])); | |
398 | } | |
399 | ||
400 | printf(" total\t%10lu %8lu\n", | |
401 | total_pages, pages2mb(total_pages)); | |
402 | } | |
403 | ||
404 | ||
405 | /* | |
406 | * page flag filters | |
407 | */ | |
408 | ||
b7ed698c | 409 | static int bit_mask_ok(uint64_t flags) |
35efa5e9 WF |
410 | { |
411 | int i; | |
412 | ||
413 | for (i = 0; i < nr_bit_filters; i++) { | |
414 | if (opt_bits[i] == KPF_ALL_BITS) { | |
415 | if ((flags & opt_mask[i]) == 0) | |
416 | return 0; | |
417 | } else { | |
418 | if ((flags & opt_mask[i]) != opt_bits[i]) | |
419 | return 0; | |
420 | } | |
421 | } | |
422 | ||
423 | return 1; | |
424 | } | |
425 | ||
b7ed698c | 426 | static uint64_t expand_overloaded_flags(uint64_t flags) |
35efa5e9 WF |
427 | { |
428 | /* SLOB/SLUB overload several page flags */ | |
429 | if (flags & BIT(SLAB)) { | |
430 | if (flags & BIT(PRIVATE)) | |
431 | flags ^= BIT(PRIVATE) | BIT(SLOB_FREE); | |
432 | if (flags & BIT(ACTIVE)) | |
433 | flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN); | |
434 | if (flags & BIT(ERROR)) | |
435 | flags ^= BIT(ERROR) | BIT(SLUB_DEBUG); | |
436 | } | |
437 | ||
438 | /* PG_reclaim is overloaded as PG_readahead in the read path */ | |
439 | if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM)) | |
440 | flags ^= BIT(RECLAIM) | BIT(READAHEAD); | |
441 | ||
442 | return flags; | |
443 | } | |
444 | ||
b7ed698c | 445 | static uint64_t well_known_flags(uint64_t flags) |
35efa5e9 WF |
446 | { |
447 | /* hide flags intended only for kernel hacker */ | |
448 | flags &= ~KPF_HACKERS_BITS; | |
449 | ||
450 | /* hide non-hugeTLB compound pages */ | |
451 | if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE))) | |
452 | flags &= ~BITS_COMPOUND; | |
453 | ||
454 | return flags; | |
455 | } | |
456 | ||
48640d69 WF |
457 | static uint64_t kpageflags_flags(uint64_t flags) |
458 | { | |
459 | flags = expand_overloaded_flags(flags); | |
460 | ||
461 | if (!opt_raw) | |
462 | flags = well_known_flags(flags); | |
463 | ||
464 | return flags; | |
465 | } | |
466 | ||
a54fed9f WF |
467 | /* |
468 | * page actions | |
469 | */ | |
470 | ||
471 | static void prepare_hwpoison_fd(void) | |
472 | { | |
473 | char buf[100]; | |
474 | ||
475 | if (opt_hwpoison && !hwpoison_inject_fd) { | |
476 | sprintf(buf, "%s/corrupt-pfn", hwpoison_debug_fs); | |
477 | hwpoison_inject_fd = checked_open(buf, O_WRONLY); | |
478 | } | |
479 | ||
480 | if (opt_unpoison && !hwpoison_forget_fd) { | |
481 | sprintf(buf, "%s/renew-pfn", hwpoison_debug_fs); | |
482 | hwpoison_forget_fd = checked_open(buf, O_WRONLY); | |
483 | } | |
484 | } | |
485 | ||
486 | static int hwpoison_page(unsigned long offset) | |
487 | { | |
488 | char buf[100]; | |
489 | int len; | |
490 | ||
491 | len = sprintf(buf, "0x%lx\n", offset); | |
492 | len = write(hwpoison_inject_fd, buf, len); | |
493 | if (len < 0) { | |
494 | perror("hwpoison inject"); | |
495 | return len; | |
496 | } | |
497 | return 0; | |
498 | } | |
499 | ||
500 | static int unpoison_page(unsigned long offset) | |
501 | { | |
502 | char buf[100]; | |
503 | int len; | |
504 | ||
505 | len = sprintf(buf, "0x%lx\n", offset); | |
506 | len = write(hwpoison_forget_fd, buf, len); | |
507 | if (len < 0) { | |
508 | perror("hwpoison forget"); | |
509 | return len; | |
510 | } | |
511 | return 0; | |
512 | } | |
513 | ||
35efa5e9 WF |
514 | /* |
515 | * page frame walker | |
516 | */ | |
517 | ||
b7ed698c | 518 | static int hash_slot(uint64_t flags) |
35efa5e9 WF |
519 | { |
520 | int k = HASH_KEY(flags); | |
521 | int i; | |
522 | ||
523 | /* Explicitly reserve slot 0 for flags 0: the following logic | |
524 | * cannot distinguish an unoccupied slot from slot (flags==0). | |
525 | */ | |
526 | if (flags == 0) | |
527 | return 0; | |
528 | ||
529 | /* search through the remaining (HASH_SIZE-1) slots */ | |
530 | for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) { | |
531 | if (!k || k >= ARRAY_SIZE(page_flags)) | |
532 | k = 1; | |
533 | if (page_flags[k] == 0) { | |
534 | page_flags[k] = flags; | |
535 | return k; | |
536 | } | |
537 | if (page_flags[k] == flags) | |
538 | return k; | |
539 | } | |
540 | ||
541 | fatal("hash table full: bump up HASH_SHIFT?\n"); | |
542 | exit(EXIT_FAILURE); | |
543 | } | |
544 | ||
e577ebde WF |
545 | static void add_page(unsigned long voffset, |
546 | unsigned long offset, uint64_t flags) | |
35efa5e9 | 547 | { |
48640d69 | 548 | flags = kpageflags_flags(flags); |
35efa5e9 WF |
549 | |
550 | if (!bit_mask_ok(flags)) | |
551 | return; | |
552 | ||
a54fed9f WF |
553 | if (opt_hwpoison) |
554 | hwpoison_page(offset); | |
555 | if (opt_unpoison) | |
556 | unpoison_page(offset); | |
557 | ||
35efa5e9 | 558 | if (opt_list == 1) |
e577ebde | 559 | show_page_range(voffset, offset, flags); |
35efa5e9 | 560 | else if (opt_list == 2) |
e577ebde | 561 | show_page(voffset, offset, flags); |
35efa5e9 WF |
562 | |
563 | nr_pages[hash_slot(flags)]++; | |
564 | total_pages++; | |
565 | } | |
566 | ||
4a1b6726 | 567 | #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */ |
e577ebde WF |
568 | static void walk_pfn(unsigned long voffset, |
569 | unsigned long index, | |
570 | unsigned long count) | |
35efa5e9 | 571 | { |
4a1b6726 | 572 | uint64_t buf[KPAGEFLAGS_BATCH]; |
35efa5e9 | 573 | unsigned long batch; |
f1327bf1 | 574 | long pages; |
35efa5e9 WF |
575 | unsigned long i; |
576 | ||
35efa5e9 | 577 | while (count) { |
4a1b6726 WF |
578 | batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH); |
579 | pages = kpageflags_read(buf, index, batch); | |
580 | if (pages == 0) | |
35efa5e9 | 581 | break; |
35efa5e9 | 582 | |
4a1b6726 | 583 | for (i = 0; i < pages; i++) |
e577ebde | 584 | add_page(voffset + i, index + i, buf[i]); |
35efa5e9 | 585 | |
4a1b6726 WF |
586 | index += pages; |
587 | count -= pages; | |
35efa5e9 WF |
588 | } |
589 | } | |
590 | ||
4a1b6726 WF |
591 | #define PAGEMAP_BATCH (64 << 10) |
592 | static void walk_vma(unsigned long index, unsigned long count) | |
0b4b2ad5 | 593 | { |
4a1b6726 WF |
594 | uint64_t buf[PAGEMAP_BATCH]; |
595 | unsigned long batch; | |
596 | unsigned long pages; | |
597 | unsigned long pfn; | |
598 | unsigned long i; | |
0b4b2ad5 | 599 | |
4a1b6726 WF |
600 | while (count) { |
601 | batch = min_t(unsigned long, count, PAGEMAP_BATCH); | |
602 | pages = pagemap_read(buf, index, batch); | |
603 | if (pages == 0) | |
604 | break; | |
0b4b2ad5 | 605 | |
4a1b6726 WF |
606 | for (i = 0; i < pages; i++) { |
607 | pfn = pagemap_pfn(buf[i]); | |
4a1b6726 | 608 | if (pfn) |
e577ebde | 609 | walk_pfn(index + i, pfn, 1); |
4a1b6726 WF |
610 | } |
611 | ||
612 | index += pages; | |
613 | count -= pages; | |
614 | } | |
0b4b2ad5 WF |
615 | } |
616 | ||
617 | static void walk_task(unsigned long index, unsigned long count) | |
618 | { | |
0b4b2ad5 | 619 | const unsigned long end = index + count; |
e577ebde WF |
620 | unsigned long start; |
621 | int i = 0; | |
0b4b2ad5 WF |
622 | |
623 | while (index < end) { | |
624 | ||
625 | while (pg_end[i] <= index) | |
626 | if (++i >= nr_vmas) | |
627 | return; | |
628 | if (pg_start[i] >= end) | |
629 | return; | |
630 | ||
e577ebde WF |
631 | start = max_t(unsigned long, pg_start[i], index); |
632 | index = min_t(unsigned long, pg_end[i], end); | |
0b4b2ad5 | 633 | |
e577ebde WF |
634 | assert(start < index); |
635 | walk_vma(start, index - start); | |
0b4b2ad5 WF |
636 | } |
637 | } | |
638 | ||
639 | static void add_addr_range(unsigned long offset, unsigned long size) | |
640 | { | |
641 | if (nr_addr_ranges >= MAX_ADDR_RANGES) | |
642 | fatal("too many addr ranges\n"); | |
643 | ||
644 | opt_offset[nr_addr_ranges] = offset; | |
645 | opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset); | |
646 | nr_addr_ranges++; | |
647 | } | |
648 | ||
b7ed698c | 649 | static void walk_addr_ranges(void) |
35efa5e9 WF |
650 | { |
651 | int i; | |
652 | ||
31bbf66e | 653 | kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY); |
35efa5e9 WF |
654 | |
655 | if (!nr_addr_ranges) | |
0b4b2ad5 | 656 | add_addr_range(0, ULONG_MAX); |
35efa5e9 WF |
657 | |
658 | for (i = 0; i < nr_addr_ranges; i++) | |
0b4b2ad5 | 659 | if (!opt_pid) |
e577ebde | 660 | walk_pfn(0, opt_offset[i], opt_size[i]); |
0b4b2ad5 WF |
661 | else |
662 | walk_task(opt_offset[i], opt_size[i]); | |
35efa5e9 WF |
663 | |
664 | close(kpageflags_fd); | |
665 | } | |
666 | ||
667 | ||
668 | /* | |
669 | * user interface | |
670 | */ | |
671 | ||
b7ed698c | 672 | static const char *page_flag_type(uint64_t flag) |
35efa5e9 WF |
673 | { |
674 | if (flag & KPF_HACKERS_BITS) | |
675 | return "(r)"; | |
676 | if (flag & KPF_OVERLOADED_BITS) | |
677 | return "(o)"; | |
678 | return " "; | |
679 | } | |
680 | ||
b7ed698c | 681 | static void usage(void) |
35efa5e9 WF |
682 | { |
683 | int i, j; | |
684 | ||
685 | printf( | |
686 | "page-types [options]\n" | |
9fdcd886 | 687 | " -r|--raw Raw mode, for kernel developers\n" |
dcfe730c | 688 | " -d|--describe flags Describe flags\n" |
9fdcd886 AC |
689 | " -a|--addr addr-spec Walk a range of pages\n" |
690 | " -b|--bits bits-spec Walk pages with specified bits\n" | |
691 | " -p|--pid pid Walk process address space\n" | |
0b4b2ad5 | 692 | #if 0 /* planned features */ |
9fdcd886 | 693 | " -f|--file filename Walk file address space\n" |
35efa5e9 | 694 | #endif |
9fdcd886 AC |
695 | " -l|--list Show page details in ranges\n" |
696 | " -L|--list-each Show page details one by one\n" | |
697 | " -N|--no-summary Don't show summay info\n" | |
698 | " -X|--hwpoison hwpoison pages\n" | |
699 | " -x|--unpoison unpoison pages\n" | |
700 | " -h|--help Show this usage message\n" | |
dcfe730c | 701 | "flags:\n" |
9fdcd886 AC |
702 | " 0x10 bitfield format, e.g.\n" |
703 | " anon bit-name, e.g.\n" | |
704 | " 0x10,anon comma-separated list, e.g.\n" | |
35efa5e9 | 705 | "addr-spec:\n" |
9fdcd886 AC |
706 | " N one page at offset N (unit: pages)\n" |
707 | " N+M pages range from N to N+M-1\n" | |
708 | " N,M pages range from N to M-1\n" | |
709 | " N, pages range from N to end\n" | |
710 | " ,M pages range from 0 to M-1\n" | |
35efa5e9 | 711 | "bits-spec:\n" |
9fdcd886 AC |
712 | " bit1,bit2 (flags & (bit1|bit2)) != 0\n" |
713 | " bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n" | |
714 | " bit1,~bit2 (flags & (bit1|bit2)) == bit1\n" | |
715 | " =bit1,bit2 flags == (bit1|bit2)\n" | |
35efa5e9 WF |
716 | "bit-names:\n" |
717 | ); | |
718 | ||
719 | for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) { | |
720 | if (!page_flag_names[i]) | |
721 | continue; | |
722 | printf("%16s%s", page_flag_names[i] + 2, | |
723 | page_flag_type(1ULL << i)); | |
724 | if (++j > 3) { | |
725 | j = 0; | |
726 | putchar('\n'); | |
727 | } | |
728 | } | |
729 | printf("\n " | |
730 | "(r) raw mode bits (o) overloaded bits\n"); | |
731 | } | |
732 | ||
b7ed698c | 733 | static unsigned long long parse_number(const char *str) |
35efa5e9 WF |
734 | { |
735 | unsigned long long n; | |
736 | ||
737 | n = strtoll(str, NULL, 0); | |
738 | ||
739 | if (n == 0 && str[0] != '0') | |
740 | fatal("invalid name or number: %s\n", str); | |
741 | ||
742 | return n; | |
743 | } | |
744 | ||
b7ed698c | 745 | static void parse_pid(const char *str) |
35efa5e9 | 746 | { |
0b4b2ad5 WF |
747 | FILE *file; |
748 | char buf[5000]; | |
749 | ||
35efa5e9 | 750 | opt_pid = parse_number(str); |
35efa5e9 | 751 | |
0b4b2ad5 | 752 | sprintf(buf, "/proc/%d/pagemap", opt_pid); |
31bbf66e | 753 | pagemap_fd = checked_open(buf, O_RDONLY); |
0b4b2ad5 WF |
754 | |
755 | sprintf(buf, "/proc/%d/maps", opt_pid); | |
756 | file = fopen(buf, "r"); | |
757 | if (!file) { | |
758 | perror(buf); | |
759 | exit(EXIT_FAILURE); | |
760 | } | |
761 | ||
762 | while (fgets(buf, sizeof(buf), file) != NULL) { | |
763 | unsigned long vm_start; | |
764 | unsigned long vm_end; | |
765 | unsigned long long pgoff; | |
766 | int major, minor; | |
767 | char r, w, x, s; | |
768 | unsigned long ino; | |
769 | int n; | |
770 | ||
771 | n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu", | |
772 | &vm_start, | |
773 | &vm_end, | |
774 | &r, &w, &x, &s, | |
775 | &pgoff, | |
776 | &major, &minor, | |
777 | &ino); | |
778 | if (n < 10) { | |
779 | fprintf(stderr, "unexpected line: %s\n", buf); | |
780 | continue; | |
781 | } | |
782 | pg_start[nr_vmas] = vm_start / page_size; | |
783 | pg_end[nr_vmas] = vm_end / page_size; | |
784 | if (++nr_vmas >= MAX_VMAS) { | |
785 | fprintf(stderr, "too many VMAs\n"); | |
786 | break; | |
787 | } | |
788 | } | |
789 | fclose(file); | |
35efa5e9 WF |
790 | } |
791 | ||
0b4b2ad5 | 792 | static void parse_file(const char *name) |
35efa5e9 | 793 | { |
35efa5e9 WF |
794 | } |
795 | ||
b7ed698c | 796 | static void parse_addr_range(const char *optarg) |
35efa5e9 WF |
797 | { |
798 | unsigned long offset; | |
799 | unsigned long size; | |
800 | char *p; | |
801 | ||
802 | p = strchr(optarg, ','); | |
803 | if (!p) | |
804 | p = strchr(optarg, '+'); | |
805 | ||
806 | if (p == optarg) { | |
807 | offset = 0; | |
808 | size = parse_number(p + 1); | |
809 | } else if (p) { | |
810 | offset = parse_number(optarg); | |
811 | if (p[1] == '\0') | |
812 | size = ULONG_MAX; | |
813 | else { | |
814 | size = parse_number(p + 1); | |
815 | if (*p == ',') { | |
816 | if (size < offset) | |
817 | fatal("invalid range: %lu,%lu\n", | |
818 | offset, size); | |
819 | size -= offset; | |
820 | } | |
821 | } | |
822 | } else { | |
823 | offset = parse_number(optarg); | |
824 | size = 1; | |
825 | } | |
826 | ||
827 | add_addr_range(offset, size); | |
828 | } | |
829 | ||
b7ed698c | 830 | static void add_bits_filter(uint64_t mask, uint64_t bits) |
35efa5e9 WF |
831 | { |
832 | if (nr_bit_filters >= MAX_BIT_FILTERS) | |
833 | fatal("too much bit filters\n"); | |
834 | ||
835 | opt_mask[nr_bit_filters] = mask; | |
836 | opt_bits[nr_bit_filters] = bits; | |
837 | nr_bit_filters++; | |
838 | } | |
839 | ||
b7ed698c | 840 | static uint64_t parse_flag_name(const char *str, int len) |
35efa5e9 WF |
841 | { |
842 | int i; | |
843 | ||
844 | if (!*str || !len) | |
845 | return 0; | |
846 | ||
847 | if (len <= 8 && !strncmp(str, "compound", len)) | |
848 | return BITS_COMPOUND; | |
849 | ||
850 | for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) { | |
851 | if (!page_flag_names[i]) | |
852 | continue; | |
853 | if (!strncmp(str, page_flag_names[i] + 2, len)) | |
854 | return 1ULL << i; | |
855 | } | |
856 | ||
857 | return parse_number(str); | |
858 | } | |
859 | ||
b7ed698c | 860 | static uint64_t parse_flag_names(const char *str, int all) |
35efa5e9 WF |
861 | { |
862 | const char *p = str; | |
863 | uint64_t flags = 0; | |
864 | ||
865 | while (1) { | |
866 | if (*p == ',' || *p == '=' || *p == '\0') { | |
867 | if ((*str != '~') || (*str == '~' && all && *++str)) | |
868 | flags |= parse_flag_name(str, p - str); | |
869 | if (*p != ',') | |
870 | break; | |
871 | str = p + 1; | |
872 | } | |
873 | p++; | |
874 | } | |
875 | ||
876 | return flags; | |
877 | } | |
878 | ||
b7ed698c | 879 | static void parse_bits_mask(const char *optarg) |
35efa5e9 WF |
880 | { |
881 | uint64_t mask; | |
882 | uint64_t bits; | |
883 | const char *p; | |
884 | ||
885 | p = strchr(optarg, '='); | |
886 | if (p == optarg) { | |
887 | mask = KPF_ALL_BITS; | |
888 | bits = parse_flag_names(p + 1, 0); | |
889 | } else if (p) { | |
890 | mask = parse_flag_names(optarg, 0); | |
891 | bits = parse_flag_names(p + 1, 0); | |
892 | } else if (strchr(optarg, '~')) { | |
893 | mask = parse_flag_names(optarg, 1); | |
894 | bits = parse_flag_names(optarg, 0); | |
895 | } else { | |
896 | mask = parse_flag_names(optarg, 0); | |
897 | bits = KPF_ALL_BITS; | |
898 | } | |
899 | ||
900 | add_bits_filter(mask, bits); | |
901 | } | |
902 | ||
dcfe730c AC |
903 | static void describe_flags(const char *optarg) |
904 | { | |
905 | uint64_t flags = parse_flag_names(optarg, 0); | |
906 | ||
907 | printf("0x%016llx\t%s\t%s\n", | |
908 | (unsigned long long)flags, | |
909 | page_flag_name(flags), | |
910 | page_flag_longname(flags)); | |
911 | } | |
35efa5e9 | 912 | |
3428838d | 913 | static const struct option opts[] = { |
35efa5e9 WF |
914 | { "raw" , 0, NULL, 'r' }, |
915 | { "pid" , 1, NULL, 'p' }, | |
916 | { "file" , 1, NULL, 'f' }, | |
917 | { "addr" , 1, NULL, 'a' }, | |
918 | { "bits" , 1, NULL, 'b' }, | |
dcfe730c | 919 | { "describe" , 1, NULL, 'd' }, |
35efa5e9 WF |
920 | { "list" , 0, NULL, 'l' }, |
921 | { "list-each" , 0, NULL, 'L' }, | |
922 | { "no-summary", 0, NULL, 'N' }, | |
a54fed9f WF |
923 | { "hwpoison" , 0, NULL, 'X' }, |
924 | { "unpoison" , 0, NULL, 'x' }, | |
35efa5e9 WF |
925 | { "help" , 0, NULL, 'h' }, |
926 | { NULL , 0, NULL, 0 } | |
927 | }; | |
928 | ||
929 | int main(int argc, char *argv[]) | |
930 | { | |
931 | int c; | |
932 | ||
933 | page_size = getpagesize(); | |
934 | ||
935 | while ((c = getopt_long(argc, argv, | |
dcfe730c | 936 | "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) { |
35efa5e9 WF |
937 | switch (c) { |
938 | case 'r': | |
939 | opt_raw = 1; | |
940 | break; | |
941 | case 'p': | |
942 | parse_pid(optarg); | |
943 | break; | |
944 | case 'f': | |
945 | parse_file(optarg); | |
946 | break; | |
947 | case 'a': | |
948 | parse_addr_range(optarg); | |
949 | break; | |
950 | case 'b': | |
951 | parse_bits_mask(optarg); | |
952 | break; | |
dcfe730c | 953 | case 'd': |
dcfe730c | 954 | describe_flags(optarg); |
bb86a733 | 955 | exit(0); |
35efa5e9 WF |
956 | case 'l': |
957 | opt_list = 1; | |
958 | break; | |
959 | case 'L': | |
960 | opt_list = 2; | |
961 | break; | |
962 | case 'N': | |
963 | opt_no_summary = 1; | |
964 | break; | |
a54fed9f WF |
965 | case 'X': |
966 | opt_hwpoison = 1; | |
967 | prepare_hwpoison_fd(); | |
968 | break; | |
969 | case 'x': | |
970 | opt_unpoison = 1; | |
971 | prepare_hwpoison_fd(); | |
972 | break; | |
35efa5e9 WF |
973 | case 'h': |
974 | usage(); | |
975 | exit(0); | |
976 | default: | |
977 | usage(); | |
978 | exit(1); | |
979 | } | |
980 | } | |
981 | ||
0b4b2ad5 WF |
982 | if (opt_list && opt_pid) |
983 | printf("voffset\t"); | |
35efa5e9 | 984 | if (opt_list == 1) |
0b4b2ad5 | 985 | printf("offset\tlen\tflags\n"); |
35efa5e9 WF |
986 | if (opt_list == 2) |
987 | printf("offset\tflags\n"); | |
988 | ||
989 | walk_addr_ranges(); | |
990 | ||
991 | if (opt_list == 1) | |
e577ebde | 992 | show_page_range(0, 0, 0); /* drain the buffer */ |
35efa5e9 WF |
993 | |
994 | if (opt_no_summary) | |
995 | return 0; | |
996 | ||
997 | if (opt_list) | |
998 | printf("\n\n"); | |
999 | ||
1000 | show_summary(); | |
1001 | ||
1002 | return 0; | |
1003 | } |