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