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TOMOYO Linux Cross Reference
Linux/tools/vm/page-types.c

Version: ~ [ linux-5.7-rc7 ] ~ [ linux-5.6.14 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.42 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.124 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.181 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.224 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.224 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.84 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * page-types: Tool for querying page flags
  3  *
  4  * This program is free software; you can redistribute it and/or modify it
  5  * under the terms of the GNU General Public License as published by the Free
  6  * Software Foundation; version 2.
  7  *
  8  * This program is distributed in the hope that it will be useful, but WITHOUT
  9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 11  * more details.
 12  *
 13  * You should find a copy of v2 of the GNU General Public License somewhere on
 14  * your Linux system; if not, write to the Free Software Foundation, Inc., 59
 15  * Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 16  *
 17  * Copyright (C) 2009 Intel corporation
 18  *
 19  * Authors: Wu Fengguang <fengguang.wu@intel.com>
 20  */
 21 
 22 #define _LARGEFILE64_SOURCE
 23 #include <stdio.h>
 24 #include <stdlib.h>
 25 #include <unistd.h>
 26 #include <stdint.h>
 27 #include <stdarg.h>
 28 #include <string.h>
 29 #include <getopt.h>
 30 #include <limits.h>
 31 #include <assert.h>
 32 #include <sys/types.h>
 33 #include <sys/errno.h>
 34 #include <sys/fcntl.h>
 35 #include <sys/mount.h>
 36 #include <sys/statfs.h>
 37 #include "../../include/uapi/linux/magic.h"
 38 #include "../../include/uapi/linux/kernel-page-flags.h"
 39 #include <lk/debugfs.h>
 40 
 41 #ifndef MAX_PATH
 42 # define MAX_PATH 256
 43 #endif
 44 
 45 #ifndef STR
 46 # define _STR(x) #x
 47 # define STR(x) _STR(x)
 48 #endif
 49 
 50 /*
 51  * pagemap kernel ABI bits
 52  */
 53 
 54 #define PM_ENTRY_BYTES      sizeof(uint64_t)
 55 #define PM_STATUS_BITS      3
 56 #define PM_STATUS_OFFSET    (64 - PM_STATUS_BITS)
 57 #define PM_STATUS_MASK      (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
 58 #define PM_STATUS(nr)       (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
 59 #define PM_PSHIFT_BITS      6
 60 #define PM_PSHIFT_OFFSET    (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
 61 #define PM_PSHIFT_MASK      (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
 62 #define __PM_PSHIFT(x)      (((uint64_t) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
 63 #define PM_PFRAME_MASK      ((1LL << PM_PSHIFT_OFFSET) - 1)
 64 #define PM_PFRAME(x)        ((x) & PM_PFRAME_MASK)
 65 
 66 #define __PM_SOFT_DIRTY      (1LL)
 67 #define PM_PRESENT          PM_STATUS(4LL)
 68 #define PM_SWAP             PM_STATUS(2LL)
 69 #define PM_SOFT_DIRTY       __PM_PSHIFT(__PM_SOFT_DIRTY)
 70 
 71 
 72 /*
 73  * kernel page flags
 74  */
 75 
 76 #define KPF_BYTES               8
 77 #define PROC_KPAGEFLAGS         "/proc/kpageflags"
 78 
 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
 88 #define KPF_SOFTDIRTY           40
 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 
104 static const char * const page_flag_names[] = {
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",
125         [KPF_HWPOISON]          = "X:hwpoison",
126         [KPF_NOPAGE]            = "n:nopage",
127         [KPF_KSM]               = "x:ksm",
128         [KPF_THP]               = "t:thp",
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",
138         [KPF_SOFTDIRTY]         = "f:softdirty",
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 
147 static const char * const debugfs_known_mountpoints[] = {
148         "/sys/kernel/debug",
149         "/debug",
150         0,
151 };
152 
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 
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];
171 
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 
179 static int              pagemap_fd;
180 static int              kpageflags_fd;
181 
182 static int              opt_hwpoison;
183 static int              opt_unpoison;
184 
185 static char             *hwpoison_debug_fs;
186 static int              hwpoison_inject_fd;
187 static int              hwpoison_forget_fd;
188 
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];
196 static uint64_t         page_flags[HASH_SIZE];
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 
210 #define max_t(type, x, y) ({                    \
211         type __max1 = (x);                      \
212         type __max2 = (y);                      \
213         __max1 > __max2 ? __max1 : __max2; })
214 
215 static unsigned long pages2mb(unsigned long pages)
216 {
217         return (pages * page_size) >> 20;
218 }
219 
220 static void fatal(const char *x, ...)
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 
230 static int checked_open(const char *pathname, int flags)
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 
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 
298 
299 /*
300  * page flag names
301  */
302 
303 static char *page_flag_name(uint64_t flags)
304 {
305         static char buf[65];
306         int present;
307         size_t i, j;
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)
313                                 fatal("unknown flag bit %d\n", i);
314                         continue;
315                 }
316                 buf[j++] = present ? page_flag_names[i][0] : '_';
317         }
318 
319         return buf;
320 }
321 
322 static char *page_flag_longname(uint64_t flags)
323 {
324         static char buf[1024];
325         size_t i, n;
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 
346 static void show_page_range(unsigned long voffset,
347                             unsigned long offset, uint64_t flags)
348 {
349         static uint64_t      flags0;
350         static unsigned long voff;
351         static unsigned long index;
352         static unsigned long count;
353 
354         if (flags == flags0 && offset == index + count &&
355             (!opt_pid || voffset == voff + count)) {
356                 count++;
357                 return;
358         }
359 
360         if (count) {
361                 if (opt_pid)
362                         printf("%lx\t", voff);
363                 printf("%lx\t%lx\t%s\n",
364                                 index, count, page_flag_name(flags0));
365         }
366 
367         flags0 = flags;
368         index  = offset;
369         voff   = voffset;
370         count  = 1;
371 }
372 
373 static void show_page(unsigned long voffset,
374                       unsigned long offset, uint64_t flags)
375 {
376         if (opt_pid)
377                 printf("%lx\t", voffset);
378         printf("%lx\t%s\n", offset, page_flag_name(flags));
379 }
380 
381 static void show_summary(void)
382 {
383         size_t i;
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 
407 static int bit_mask_ok(uint64_t flags)
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 
424 static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
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 
440         if (pme & PM_SOFT_DIRTY)
441                 flags |= BIT(SOFTDIRTY);
442 
443         return flags;
444 }
445 
446 static uint64_t well_known_flags(uint64_t flags)
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 
458 static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme)
459 {
460         if (opt_raw)
461                 flags = expand_overloaded_flags(flags, pme);
462         else
463                 flags = well_known_flags(flags);
464 
465         return flags;
466 }
467 
468 /*
469  * page actions
470  */
471 
472 static void prepare_hwpoison_fd(void)
473 {
474         char buf[MAX_PATH + 1];
475 
476         hwpoison_debug_fs = debugfs_mount(NULL);
477         if (!hwpoison_debug_fs) {
478                 perror("mount debugfs");
479                 exit(EXIT_FAILURE);
480         }
481 
482         if (opt_hwpoison && !hwpoison_inject_fd) {
483                 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
484                         hwpoison_debug_fs);
485                 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
486         }
487 
488         if (opt_unpoison && !hwpoison_forget_fd) {
489                 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
490                         hwpoison_debug_fs);
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 
523 /*
524  * page frame walker
525  */
526 
527 static size_t hash_slot(uint64_t flags)
528 {
529         size_t k = HASH_KEY(flags);
530         size_t i;
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 
554 static void add_page(unsigned long voffset,
555                      unsigned long offset, uint64_t flags, uint64_t pme)
556 {
557         flags = kpageflags_flags(flags, pme);
558 
559         if (!bit_mask_ok(flags))
560                 return;
561 
562         if (opt_hwpoison)
563                 hwpoison_page(offset);
564         if (opt_unpoison)
565                 unpoison_page(offset);
566 
567         if (opt_list == 1)
568                 show_page_range(voffset, offset, flags);
569         else if (opt_list == 2)
570                 show_page(voffset, offset, flags);
571 
572         nr_pages[hash_slot(flags)]++;
573         total_pages++;
574 }
575 
576 #define KPAGEFLAGS_BATCH        (64 << 10)      /* 64k pages */
577 static void walk_pfn(unsigned long voffset,
578                      unsigned long index,
579                      unsigned long count,
580                      uint64_t pme)
581 {
582         uint64_t buf[KPAGEFLAGS_BATCH];
583         unsigned long batch;
584         unsigned long pages;
585         unsigned long i;
586 
587         while (count) {
588                 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
589                 pages = kpageflags_read(buf, index, batch);
590                 if (pages == 0)
591                         break;
592 
593                 for (i = 0; i < pages; i++)
594                         add_page(voffset + i, index + i, buf[i], pme);
595 
596                 index += pages;
597                 count -= pages;
598         }
599 }
600 
601 #define PAGEMAP_BATCH   (64 << 10)
602 static void walk_vma(unsigned long index, unsigned long count)
603 {
604         uint64_t buf[PAGEMAP_BATCH];
605         unsigned long batch;
606         unsigned long pages;
607         unsigned long pfn;
608         unsigned long i;
609 
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;
615 
616                 for (i = 0; i < pages; i++) {
617                         pfn = pagemap_pfn(buf[i]);
618                         if (pfn)
619                                 walk_pfn(index + i, pfn, 1, buf[i]);
620                 }
621 
622                 index += pages;
623                 count -= pages;
624         }
625 }
626 
627 static void walk_task(unsigned long index, unsigned long count)
628 {
629         const unsigned long end = index + count;
630         unsigned long start;
631         int i = 0;
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 
641                 start = max_t(unsigned long, pg_start[i], index);
642                 index = min_t(unsigned long, pg_end[i], end);
643 
644                 assert(start < index);
645                 walk_vma(start, index - start);
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 
659 static void walk_addr_ranges(void)
660 {
661         int i;
662 
663         kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
664 
665         if (!nr_addr_ranges)
666                 add_addr_range(0, ULONG_MAX);
667 
668         for (i = 0; i < nr_addr_ranges; i++)
669                 if (!opt_pid)
670                         walk_pfn(0, opt_offset[i], opt_size[i], 0);
671                 else
672                         walk_task(opt_offset[i], opt_size[i]);
673 
674         close(kpageflags_fd);
675 }
676 
677 
678 /*
679  * user interface
680  */
681 
682 static const char *page_flag_type(uint64_t flag)
683 {
684         if (flag & KPF_HACKERS_BITS)
685                 return "(r)";
686         if (flag & KPF_OVERLOADED_BITS)
687                 return "(o)";
688         return "   ";
689 }
690 
691 static void usage(void)
692 {
693         size_t i, j;
694 
695         printf(
696 "page-types [options]\n"
697 "            -r|--raw                   Raw mode, for kernel developers\n"
698 "            -d|--describe flags        Describe flags\n"
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"
702 #if 0 /* planned features */
703 "            -f|--file    filename      Walk file address space\n"
704 #endif
705 "            -l|--list                  Show page details in ranges\n"
706 "            -L|--list-each             Show page details one by one\n"
707 "            -N|--no-summary            Don't show summary info\n"
708 "            -X|--hwpoison              hwpoison pages\n"
709 "            -x|--unpoison              unpoison pages\n"
710 "            -h|--help                  Show this usage message\n"
711 "flags:\n"
712 "            0x10                       bitfield format, e.g.\n"
713 "            anon                       bit-name, e.g.\n"
714 "            0x10,anon                  comma-separated list, e.g.\n"
715 "addr-spec:\n"
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"
721 "bits-spec:\n"
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"
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 
743 static unsigned long long parse_number(const char *str)
744 {
745         unsigned long long n;
746 
747         n = strtoll(str, NULL, 0);
748 
749         if (n == 0 && str[0] != '')
750                 fatal("invalid name or number: %s\n", str);
751 
752         return n;
753 }
754 
755 static void parse_pid(const char *str)
756 {
757         FILE *file;
758         char buf[5000];
759 
760         opt_pid = parse_number(str);
761 
762         sprintf(buf, "/proc/%d/pagemap", opt_pid);
763         pagemap_fd = checked_open(buf, O_RDONLY);
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);
800 }
801 
802 static void parse_file(const char *name)
803 {
804 }
805 
806 static void parse_addr_range(const char *optarg)
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 
840 static void add_bits_filter(uint64_t mask, uint64_t bits)
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 
850 static uint64_t parse_flag_name(const char *str, int len)
851 {
852         size_t i;
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 
870 static uint64_t parse_flag_names(const char *str, int all)
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 
889 static void parse_bits_mask(const char *optarg)
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 
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 }
922 
923 static const struct option opts[] = {
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' },
929         { "describe"  , 1, NULL, 'd' },
930         { "list"      , 0, NULL, 'l' },
931         { "list-each" , 0, NULL, 'L' },
932         { "no-summary", 0, NULL, 'N' },
933         { "hwpoison"  , 0, NULL, 'X' },
934         { "unpoison"  , 0, NULL, 'x' },
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,
946                                 "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
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;
963                 case 'd':
964                         describe_flags(optarg);
965                         exit(0);
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;
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;
983                 case 'h':
984                         usage();
985                         exit(0);
986                 default:
987                         usage();
988                         exit(1);
989                 }
990         }
991 
992         if (opt_list && opt_pid)
993                 printf("voffset\t");
994         if (opt_list == 1)
995                 printf("offset\tlen\tflags\n");
996         if (opt_list == 2)
997                 printf("offset\tflags\n");
998 
999         walk_addr_ranges();
1000 
1001         if (opt_list == 1)
1002                 show_page_range(0, 0, 0);  /* drain the buffer */
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 }
1014 

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