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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/pagewalk.h>
3#include <linux/vmacache.h>
4#include <linux/hugetlb.h>
5#include <linux/huge_mm.h>
6#include <linux/mount.h>
7#include <linux/seq_file.h>
8#include <linux/highmem.h>
9#include <linux/ptrace.h>
10#include <linux/slab.h>
11#include <linux/pagemap.h>
12#include <linux/mempolicy.h>
13#include <linux/rmap.h>
14#include <linux/swap.h>
15#include <linux/sched/mm.h>
16#include <linux/swapops.h>
17#include <linux/mmu_notifier.h>
18#include <linux/page_idle.h>
19#include <linux/shmem_fs.h>
20#include <linux/uaccess.h>
21#include <linux/pkeys.h>
22
23#include <asm/elf.h>
24#include <asm/tlb.h>
25#include <asm/tlbflush.h>
26#include "internal.h"
27
28#define SEQ_PUT_DEC(str, val) \
29 seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8)
30void task_mem(struct seq_file *m, struct mm_struct *mm)
31{
32 unsigned long text, lib, swap, anon, file, shmem;
33 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
34
35 anon = get_mm_counter(mm, MM_ANONPAGES);
36 file = get_mm_counter(mm, MM_FILEPAGES);
37 shmem = get_mm_counter(mm, MM_SHMEMPAGES);
38
39 /*
40 * Note: to minimize their overhead, mm maintains hiwater_vm and
41 * hiwater_rss only when about to *lower* total_vm or rss. Any
42 * collector of these hiwater stats must therefore get total_vm
43 * and rss too, which will usually be the higher. Barriers? not
44 * worth the effort, such snapshots can always be inconsistent.
45 */
46 hiwater_vm = total_vm = mm->total_vm;
47 if (hiwater_vm < mm->hiwater_vm)
48 hiwater_vm = mm->hiwater_vm;
49 hiwater_rss = total_rss = anon + file + shmem;
50 if (hiwater_rss < mm->hiwater_rss)
51 hiwater_rss = mm->hiwater_rss;
52
53 /* split executable areas between text and lib */
54 text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK);
55 text = min(text, mm->exec_vm << PAGE_SHIFT);
56 lib = (mm->exec_vm << PAGE_SHIFT) - text;
57
58 swap = get_mm_counter(mm, MM_SWAPENTS);
59 SEQ_PUT_DEC("VmPeak:\t", hiwater_vm);
60 SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm);
61 SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm);
62 SEQ_PUT_DEC(" kB\nVmPin:\t", atomic64_read(&mm->pinned_vm));
63 SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss);
64 SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss);
65 SEQ_PUT_DEC(" kB\nRssAnon:\t", anon);
66 SEQ_PUT_DEC(" kB\nRssFile:\t", file);
67 SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem);
68 SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm);
69 SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm);
70 seq_put_decimal_ull_width(m,
71 " kB\nVmExe:\t", text >> 10, 8);
72 seq_put_decimal_ull_width(m,
73 " kB\nVmLib:\t", lib >> 10, 8);
74 seq_put_decimal_ull_width(m,
75 " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8);
76 SEQ_PUT_DEC(" kB\nVmSwap:\t", swap);
77 seq_puts(m, " kB\n");
78 hugetlb_report_usage(m, mm);
79}
80#undef SEQ_PUT_DEC
81
82unsigned long task_vsize(struct mm_struct *mm)
83{
84 return PAGE_SIZE * mm->total_vm;
85}
86
87unsigned long task_statm(struct mm_struct *mm,
88 unsigned long *shared, unsigned long *text,
89 unsigned long *data, unsigned long *resident)
90{
91 *shared = get_mm_counter(mm, MM_FILEPAGES) +
92 get_mm_counter(mm, MM_SHMEMPAGES);
93 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
94 >> PAGE_SHIFT;
95 *data = mm->data_vm + mm->stack_vm;
96 *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
97 return mm->total_vm;
98}
99
100#ifdef CONFIG_NUMA
101/*
102 * Save get_task_policy() for show_numa_map().
103 */
104static void hold_task_mempolicy(struct proc_maps_private *priv)
105{
106 struct task_struct *task = priv->task;
107
108 task_lock(task);
109 priv->task_mempolicy = get_task_policy(task);
110 mpol_get(priv->task_mempolicy);
111 task_unlock(task);
112}
113static void release_task_mempolicy(struct proc_maps_private *priv)
114{
115 mpol_put(priv->task_mempolicy);
116}
117#else
118static void hold_task_mempolicy(struct proc_maps_private *priv)
119{
120}
121static void release_task_mempolicy(struct proc_maps_private *priv)
122{
123}
124#endif
125
126static void *m_start(struct seq_file *m, loff_t *ppos)
127{
128 struct proc_maps_private *priv = m->private;
129 unsigned long last_addr = *ppos;
130 struct mm_struct *mm;
131 struct vm_area_struct *vma;
132
133 /* See m_next(). Zero at the start or after lseek. */
134 if (last_addr == -1UL)
135 return NULL;
136
137 priv->task = get_proc_task(priv->inode);
138 if (!priv->task)
139 return ERR_PTR(-ESRCH);
140
141 mm = priv->mm;
142 if (!mm || !mmget_not_zero(mm)) {
143 put_task_struct(priv->task);
144 priv->task = NULL;
145 return NULL;
146 }
147
148 if (mmap_read_lock_killable(mm)) {
149 mmput(mm);
150 put_task_struct(priv->task);
151 priv->task = NULL;
152 return ERR_PTR(-EINTR);
153 }
154
155 hold_task_mempolicy(priv);
156 priv->tail_vma = get_gate_vma(mm);
157
158 vma = find_vma(mm, last_addr);
159 if (vma)
160 return vma;
161
162 return priv->tail_vma;
163}
164
165static void *m_next(struct seq_file *m, void *v, loff_t *ppos)
166{
167 struct proc_maps_private *priv = m->private;
168 struct vm_area_struct *next, *vma = v;
169
170 if (vma == priv->tail_vma)
171 next = NULL;
172 else if (vma->vm_next)
173 next = vma->vm_next;
174 else
175 next = priv->tail_vma;
176
177 *ppos = next ? next->vm_start : -1UL;
178
179 return next;
180}
181
182static void m_stop(struct seq_file *m, void *v)
183{
184 struct proc_maps_private *priv = m->private;
185 struct mm_struct *mm = priv->mm;
186
187 if (!priv->task)
188 return;
189
190 release_task_mempolicy(priv);
191 mmap_read_unlock(mm);
192 mmput(mm);
193 put_task_struct(priv->task);
194 priv->task = NULL;
195}
196
197static int proc_maps_open(struct inode *inode, struct file *file,
198 const struct seq_operations *ops, int psize)
199{
200 struct proc_maps_private *priv = __seq_open_private(file, ops, psize);
201
202 if (!priv)
203 return -ENOMEM;
204
205 priv->inode = inode;
206 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
207 if (IS_ERR(priv->mm)) {
208 int err = PTR_ERR(priv->mm);
209
210 seq_release_private(inode, file);
211 return err;
212 }
213
214 return 0;
215}
216
217static int proc_map_release(struct inode *inode, struct file *file)
218{
219 struct seq_file *seq = file->private_data;
220 struct proc_maps_private *priv = seq->private;
221
222 if (priv->mm)
223 mmdrop(priv->mm);
224
225 return seq_release_private(inode, file);
226}
227
228static int do_maps_open(struct inode *inode, struct file *file,
229 const struct seq_operations *ops)
230{
231 return proc_maps_open(inode, file, ops,
232 sizeof(struct proc_maps_private));
233}
234
235/*
236 * Indicate if the VMA is a stack for the given task; for
237 * /proc/PID/maps that is the stack of the main task.
238 */
239static int is_stack(struct vm_area_struct *vma)
240{
241 /*
242 * We make no effort to guess what a given thread considers to be
243 * its "stack". It's not even well-defined for programs written
244 * languages like Go.
245 */
246 return vma->vm_start <= vma->vm_mm->start_stack &&
247 vma->vm_end >= vma->vm_mm->start_stack;
248}
249
250static void show_vma_header_prefix(struct seq_file *m,
251 unsigned long start, unsigned long end,
252 vm_flags_t flags, unsigned long long pgoff,
253 dev_t dev, unsigned long ino)
254{
255 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
256 seq_put_hex_ll(m, NULL, start, 8);
257 seq_put_hex_ll(m, "-", end, 8);
258 seq_putc(m, ' ');
259 seq_putc(m, flags & VM_READ ? 'r' : '-');
260 seq_putc(m, flags & VM_WRITE ? 'w' : '-');
261 seq_putc(m, flags & VM_EXEC ? 'x' : '-');
262 seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p');
263 seq_put_hex_ll(m, " ", pgoff, 8);
264 seq_put_hex_ll(m, " ", MAJOR(dev), 2);
265 seq_put_hex_ll(m, ":", MINOR(dev), 2);
266 seq_put_decimal_ull(m, " ", ino);
267 seq_putc(m, ' ');
268}
269
270static void
271show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
272{
273 struct mm_struct *mm = vma->vm_mm;
274 struct file *file = vma->vm_file;
275 vm_flags_t flags = vma->vm_flags;
276 unsigned long ino = 0;
277 unsigned long long pgoff = 0;
278 unsigned long start, end;
279 dev_t dev = 0;
280 const char *name = NULL;
281
282 if (file) {
283 struct inode *inode = file_inode(vma->vm_file);
284 dev = inode->i_sb->s_dev;
285 ino = inode->i_ino;
286 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
287 }
288
289 start = vma->vm_start;
290 end = vma->vm_end;
291 show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
292
293 /*
294 * Print the dentry name for named mappings, and a
295 * special [heap] marker for the heap:
296 */
297 if (file) {
298 seq_pad(m, ' ');
299 seq_file_path(m, file, "\n");
300 goto done;
301 }
302
303 if (vma->vm_ops && vma->vm_ops->name) {
304 name = vma->vm_ops->name(vma);
305 if (name)
306 goto done;
307 }
308
309 name = arch_vma_name(vma);
310 if (!name) {
311 if (!mm) {
312 name = "[vdso]";
313 goto done;
314 }
315
316 if (vma->vm_start <= mm->brk &&
317 vma->vm_end >= mm->start_brk) {
318 name = "[heap]";
319 goto done;
320 }
321
322 if (is_stack(vma))
323 name = "[stack]";
324 }
325
326done:
327 if (name) {
328 seq_pad(m, ' ');
329 seq_puts(m, name);
330 }
331 seq_putc(m, '\n');
332}
333
334static int show_map(struct seq_file *m, void *v)
335{
336 show_map_vma(m, v);
337 return 0;
338}
339
340static const struct seq_operations proc_pid_maps_op = {
341 .start = m_start,
342 .next = m_next,
343 .stop = m_stop,
344 .show = show_map
345};
346
347static int pid_maps_open(struct inode *inode, struct file *file)
348{
349 return do_maps_open(inode, file, &proc_pid_maps_op);
350}
351
352const struct file_operations proc_pid_maps_operations = {
353 .open = pid_maps_open,
354 .read = seq_read,
355 .llseek = seq_lseek,
356 .release = proc_map_release,
357};
358
359/*
360 * Proportional Set Size(PSS): my share of RSS.
361 *
362 * PSS of a process is the count of pages it has in memory, where each
363 * page is divided by the number of processes sharing it. So if a
364 * process has 1000 pages all to itself, and 1000 shared with one other
365 * process, its PSS will be 1500.
366 *
367 * To keep (accumulated) division errors low, we adopt a 64bit
368 * fixed-point pss counter to minimize division errors. So (pss >>
369 * PSS_SHIFT) would be the real byte count.
370 *
371 * A shift of 12 before division means (assuming 4K page size):
372 * - 1M 3-user-pages add up to 8KB errors;
373 * - supports mapcount up to 2^24, or 16M;
374 * - supports PSS up to 2^52 bytes, or 4PB.
375 */
376#define PSS_SHIFT 12
377
378#ifdef CONFIG_PROC_PAGE_MONITOR
379struct mem_size_stats {
380 unsigned long resident;
381 unsigned long shared_clean;
382 unsigned long shared_dirty;
383 unsigned long private_clean;
384 unsigned long private_dirty;
385 unsigned long referenced;
386 unsigned long anonymous;
387 unsigned long lazyfree;
388 unsigned long anonymous_thp;
389 unsigned long shmem_thp;
390 unsigned long file_thp;
391 unsigned long swap;
392 unsigned long shared_hugetlb;
393 unsigned long private_hugetlb;
394 u64 pss;
395 u64 pss_anon;
396 u64 pss_file;
397 u64 pss_shmem;
398 u64 pss_locked;
399 u64 swap_pss;
400 bool check_shmem_swap;
401};
402
403static void smaps_page_accumulate(struct mem_size_stats *mss,
404 struct page *page, unsigned long size, unsigned long pss,
405 bool dirty, bool locked, bool private)
406{
407 mss->pss += pss;
408
409 if (PageAnon(page))
410 mss->pss_anon += pss;
411 else if (PageSwapBacked(page))
412 mss->pss_shmem += pss;
413 else
414 mss->pss_file += pss;
415
416 if (locked)
417 mss->pss_locked += pss;
418
419 if (dirty || PageDirty(page)) {
420 if (private)
421 mss->private_dirty += size;
422 else
423 mss->shared_dirty += size;
424 } else {
425 if (private)
426 mss->private_clean += size;
427 else
428 mss->shared_clean += size;
429 }
430}
431
432static void smaps_account(struct mem_size_stats *mss, struct page *page,
433 bool compound, bool young, bool dirty, bool locked)
434{
435 int i, nr = compound ? compound_nr(page) : 1;
436 unsigned long size = nr * PAGE_SIZE;
437
438 /*
439 * First accumulate quantities that depend only on |size| and the type
440 * of the compound page.
441 */
442 if (PageAnon(page)) {
443 mss->anonymous += size;
444 if (!PageSwapBacked(page) && !dirty && !PageDirty(page))
445 mss->lazyfree += size;
446 }
447
448 mss->resident += size;
449 /* Accumulate the size in pages that have been accessed. */
450 if (young || page_is_young(page) || PageReferenced(page))
451 mss->referenced += size;
452
453 /*
454 * Then accumulate quantities that may depend on sharing, or that may
455 * differ page-by-page.
456 *
457 * page_count(page) == 1 guarantees the page is mapped exactly once.
458 * If any subpage of the compound page mapped with PTE it would elevate
459 * page_count().
460 */
461 if (page_count(page) == 1) {
462 smaps_page_accumulate(mss, page, size, size << PSS_SHIFT, dirty,
463 locked, true);
464 return;
465 }
466 for (i = 0; i < nr; i++, page++) {
467 int mapcount = page_mapcount(page);
468 unsigned long pss = PAGE_SIZE << PSS_SHIFT;
469 if (mapcount >= 2)
470 pss /= mapcount;
471 smaps_page_accumulate(mss, page, PAGE_SIZE, pss, dirty, locked,
472 mapcount < 2);
473 }
474}
475
476#ifdef CONFIG_SHMEM
477static int smaps_pte_hole(unsigned long addr, unsigned long end,
478 __always_unused int depth, struct mm_walk *walk)
479{
480 struct mem_size_stats *mss = walk->private;
481
482 mss->swap += shmem_partial_swap_usage(
483 walk->vma->vm_file->f_mapping, addr, end);
484
485 return 0;
486}
487#else
488#define smaps_pte_hole NULL
489#endif /* CONFIG_SHMEM */
490
491static void smaps_pte_entry(pte_t *pte, unsigned long addr,
492 struct mm_walk *walk)
493{
494 struct mem_size_stats *mss = walk->private;
495 struct vm_area_struct *vma = walk->vma;
496 bool locked = !!(vma->vm_flags & VM_LOCKED);
497 struct page *page = NULL;
498
499 if (pte_present(*pte)) {
500 page = vm_normal_page(vma, addr, *pte);
501 } else if (is_swap_pte(*pte)) {
502 swp_entry_t swpent = pte_to_swp_entry(*pte);
503
504 if (!non_swap_entry(swpent)) {
505 int mapcount;
506
507 mss->swap += PAGE_SIZE;
508 mapcount = swp_swapcount(swpent);
509 if (mapcount >= 2) {
510 u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
511
512 do_div(pss_delta, mapcount);
513 mss->swap_pss += pss_delta;
514 } else {
515 mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
516 }
517 } else if (is_migration_entry(swpent))
518 page = migration_entry_to_page(swpent);
519 else if (is_device_private_entry(swpent))
520 page = device_private_entry_to_page(swpent);
521 } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap
522 && pte_none(*pte))) {
523 page = find_get_entry(vma->vm_file->f_mapping,
524 linear_page_index(vma, addr));
525 if (!page)
526 return;
527
528 if (xa_is_value(page))
529 mss->swap += PAGE_SIZE;
530 else
531 put_page(page);
532
533 return;
534 }
535
536 if (!page)
537 return;
538
539 smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte), locked);
540}
541
542#ifdef CONFIG_TRANSPARENT_HUGEPAGE
543static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
544 struct mm_walk *walk)
545{
546 struct mem_size_stats *mss = walk->private;
547 struct vm_area_struct *vma = walk->vma;
548 bool locked = !!(vma->vm_flags & VM_LOCKED);
549 struct page *page = NULL;
550
551 if (pmd_present(*pmd)) {
552 /* FOLL_DUMP will return -EFAULT on huge zero page */
553 page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
554 } else if (unlikely(thp_migration_supported() && is_swap_pmd(*pmd))) {
555 swp_entry_t entry = pmd_to_swp_entry(*pmd);
556
557 if (is_migration_entry(entry))
558 page = migration_entry_to_page(entry);
559 }
560 if (IS_ERR_OR_NULL(page))
561 return;
562 if (PageAnon(page))
563 mss->anonymous_thp += HPAGE_PMD_SIZE;
564 else if (PageSwapBacked(page))
565 mss->shmem_thp += HPAGE_PMD_SIZE;
566 else if (is_zone_device_page(page))
567 /* pass */;
568 else
569 mss->file_thp += HPAGE_PMD_SIZE;
570 smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd), locked);
571}
572#else
573static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
574 struct mm_walk *walk)
575{
576}
577#endif
578
579static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
580 struct mm_walk *walk)
581{
582 struct vm_area_struct *vma = walk->vma;
583 pte_t *pte;
584 spinlock_t *ptl;
585
586 ptl = pmd_trans_huge_lock(pmd, vma);
587 if (ptl) {
588 smaps_pmd_entry(pmd, addr, walk);
589 spin_unlock(ptl);
590 goto out;
591 }
592
593 if (pmd_trans_unstable(pmd))
594 goto out;
595 /*
596 * The mmap_lock held all the way back in m_start() is what
597 * keeps khugepaged out of here and from collapsing things
598 * in here.
599 */
600 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
601 for (; addr != end; pte++, addr += PAGE_SIZE)
602 smaps_pte_entry(pte, addr, walk);
603 pte_unmap_unlock(pte - 1, ptl);
604out:
605 cond_resched();
606 return 0;
607}
608
609static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
610{
611 /*
612 * Don't forget to update Documentation/ on changes.
613 */
614 static const char mnemonics[BITS_PER_LONG][2] = {
615 /*
616 * In case if we meet a flag we don't know about.
617 */
618 [0 ... (BITS_PER_LONG-1)] = "??",
619
620 [ilog2(VM_READ)] = "rd",
621 [ilog2(VM_WRITE)] = "wr",
622 [ilog2(VM_EXEC)] = "ex",
623 [ilog2(VM_SHARED)] = "sh",
624 [ilog2(VM_MAYREAD)] = "mr",
625 [ilog2(VM_MAYWRITE)] = "mw",
626 [ilog2(VM_MAYEXEC)] = "me",
627 [ilog2(VM_MAYSHARE)] = "ms",
628 [ilog2(VM_GROWSDOWN)] = "gd",
629 [ilog2(VM_PFNMAP)] = "pf",
630 [ilog2(VM_DENYWRITE)] = "dw",
631 [ilog2(VM_LOCKED)] = "lo",
632 [ilog2(VM_IO)] = "io",
633 [ilog2(VM_SEQ_READ)] = "sr",
634 [ilog2(VM_RAND_READ)] = "rr",
635 [ilog2(VM_DONTCOPY)] = "dc",
636 [ilog2(VM_DONTEXPAND)] = "de",
637 [ilog2(VM_ACCOUNT)] = "ac",
638 [ilog2(VM_NORESERVE)] = "nr",
639 [ilog2(VM_HUGETLB)] = "ht",
640 [ilog2(VM_SYNC)] = "sf",
641 [ilog2(VM_ARCH_1)] = "ar",
642 [ilog2(VM_WIPEONFORK)] = "wf",
643 [ilog2(VM_DONTDUMP)] = "dd",
644#ifdef CONFIG_ARM64_BTI
645 [ilog2(VM_ARM64_BTI)] = "bt",
646#endif
647#ifdef CONFIG_MEM_SOFT_DIRTY
648 [ilog2(VM_SOFTDIRTY)] = "sd",
649#endif
650 [ilog2(VM_MIXEDMAP)] = "mm",
651 [ilog2(VM_HUGEPAGE)] = "hg",
652 [ilog2(VM_NOHUGEPAGE)] = "nh",
653 [ilog2(VM_MERGEABLE)] = "mg",
654 [ilog2(VM_UFFD_MISSING)]= "um",
655 [ilog2(VM_UFFD_WP)] = "uw",
656#ifdef CONFIG_ARCH_HAS_PKEYS
657 /* These come out via ProtectionKey: */
658 [ilog2(VM_PKEY_BIT0)] = "",
659 [ilog2(VM_PKEY_BIT1)] = "",
660 [ilog2(VM_PKEY_BIT2)] = "",
661 [ilog2(VM_PKEY_BIT3)] = "",
662#if VM_PKEY_BIT4
663 [ilog2(VM_PKEY_BIT4)] = "",
664#endif
665#endif /* CONFIG_ARCH_HAS_PKEYS */
666 };
667 size_t i;
668
669 seq_puts(m, "VmFlags: ");
670 for (i = 0; i < BITS_PER_LONG; i++) {
671 if (!mnemonics[i][0])
672 continue;
673 if (vma->vm_flags & (1UL << i)) {
674 seq_putc(m, mnemonics[i][0]);
675 seq_putc(m, mnemonics[i][1]);
676 seq_putc(m, ' ');
677 }
678 }
679 seq_putc(m, '\n');
680}
681
682#ifdef CONFIG_HUGETLB_PAGE
683static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
684 unsigned long addr, unsigned long end,
685 struct mm_walk *walk)
686{
687 struct mem_size_stats *mss = walk->private;
688 struct vm_area_struct *vma = walk->vma;
689 struct page *page = NULL;
690
691 if (pte_present(*pte)) {
692 page = vm_normal_page(vma, addr, *pte);
693 } else if (is_swap_pte(*pte)) {
694 swp_entry_t swpent = pte_to_swp_entry(*pte);
695
696 if (is_migration_entry(swpent))
697 page = migration_entry_to_page(swpent);
698 else if (is_device_private_entry(swpent))
699 page = device_private_entry_to_page(swpent);
700 }
701 if (page) {
702 int mapcount = page_mapcount(page);
703
704 if (mapcount >= 2)
705 mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
706 else
707 mss->private_hugetlb += huge_page_size(hstate_vma(vma));
708 }
709 return 0;
710}
711#else
712#define smaps_hugetlb_range NULL
713#endif /* HUGETLB_PAGE */
714
715static const struct mm_walk_ops smaps_walk_ops = {
716 .pmd_entry = smaps_pte_range,
717 .hugetlb_entry = smaps_hugetlb_range,
718};
719
720static const struct mm_walk_ops smaps_shmem_walk_ops = {
721 .pmd_entry = smaps_pte_range,
722 .hugetlb_entry = smaps_hugetlb_range,
723 .pte_hole = smaps_pte_hole,
724};
725
726static void smap_gather_stats(struct vm_area_struct *vma,
727 struct mem_size_stats *mss)
728{
729#ifdef CONFIG_SHMEM
730 /* In case of smaps_rollup, reset the value from previous vma */
731 mss->check_shmem_swap = false;
732 if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) {
733 /*
734 * For shared or readonly shmem mappings we know that all
735 * swapped out pages belong to the shmem object, and we can
736 * obtain the swap value much more efficiently. For private
737 * writable mappings, we might have COW pages that are
738 * not affected by the parent swapped out pages of the shmem
739 * object, so we have to distinguish them during the page walk.
740 * Unless we know that the shmem object (or the part mapped by
741 * our VMA) has no swapped out pages at all.
742 */
743 unsigned long shmem_swapped = shmem_swap_usage(vma);
744
745 if (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
746 !(vma->vm_flags & VM_WRITE)) {
747 mss->swap += shmem_swapped;
748 } else {
749 mss->check_shmem_swap = true;
750 walk_page_vma(vma, &smaps_shmem_walk_ops, mss);
751 return;
752 }
753 }
754#endif
755 /* mmap_lock is held in m_start */
756 walk_page_vma(vma, &smaps_walk_ops, mss);
757}
758
759#define SEQ_PUT_DEC(str, val) \
760 seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
761
762/* Show the contents common for smaps and smaps_rollup */
763static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss,
764 bool rollup_mode)
765{
766 SEQ_PUT_DEC("Rss: ", mss->resident);
767 SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT);
768 if (rollup_mode) {
769 /*
770 * These are meaningful only for smaps_rollup, otherwise two of
771 * them are zero, and the other one is the same as Pss.
772 */
773 SEQ_PUT_DEC(" kB\nPss_Anon: ",
774 mss->pss_anon >> PSS_SHIFT);
775 SEQ_PUT_DEC(" kB\nPss_File: ",
776 mss->pss_file >> PSS_SHIFT);
777 SEQ_PUT_DEC(" kB\nPss_Shmem: ",
778 mss->pss_shmem >> PSS_SHIFT);
779 }
780 SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean);
781 SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty);
782 SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean);
783 SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty);
784 SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced);
785 SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous);
786 SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree);
787 SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp);
788 SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp);
789 SEQ_PUT_DEC(" kB\nFilePmdMapped: ", mss->file_thp);
790 SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb);
791 seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ",
792 mss->private_hugetlb >> 10, 7);
793 SEQ_PUT_DEC(" kB\nSwap: ", mss->swap);
794 SEQ_PUT_DEC(" kB\nSwapPss: ",
795 mss->swap_pss >> PSS_SHIFT);
796 SEQ_PUT_DEC(" kB\nLocked: ",
797 mss->pss_locked >> PSS_SHIFT);
798 seq_puts(m, " kB\n");
799}
800
801static int show_smap(struct seq_file *m, void *v)
802{
803 struct vm_area_struct *vma = v;
804 struct mem_size_stats mss;
805
806 memset(&mss, 0, sizeof(mss));
807
808 smap_gather_stats(vma, &mss);
809
810 show_map_vma(m, vma);
811
812 SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start);
813 SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma));
814 SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma));
815 seq_puts(m, " kB\n");
816
817 __show_smap(m, &mss, false);
818
819 seq_printf(m, "THPeligible: %d\n",
820 transparent_hugepage_enabled(vma));
821
822 if (arch_pkeys_enabled())
823 seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma));
824 show_smap_vma_flags(m, vma);
825
826 return 0;
827}
828
829static int show_smaps_rollup(struct seq_file *m, void *v)
830{
831 struct proc_maps_private *priv = m->private;
832 struct mem_size_stats mss;
833 struct mm_struct *mm;
834 struct vm_area_struct *vma;
835 unsigned long last_vma_end = 0;
836 int ret = 0;
837
838 priv->task = get_proc_task(priv->inode);
839 if (!priv->task)
840 return -ESRCH;
841
842 mm = priv->mm;
843 if (!mm || !mmget_not_zero(mm)) {
844 ret = -ESRCH;
845 goto out_put_task;
846 }
847
848 memset(&mss, 0, sizeof(mss));
849
850 ret = mmap_read_lock_killable(mm);
851 if (ret)
852 goto out_put_mm;
853
854 hold_task_mempolicy(priv);
855
856 for (vma = priv->mm->mmap; vma; vma = vma->vm_next) {
857 smap_gather_stats(vma, &mss);
858 last_vma_end = vma->vm_end;
859 }
860
861 show_vma_header_prefix(m, priv->mm->mmap->vm_start,
862 last_vma_end, 0, 0, 0, 0);
863 seq_pad(m, ' ');
864 seq_puts(m, "[rollup]\n");
865
866 __show_smap(m, &mss, true);
867
868 release_task_mempolicy(priv);
869 mmap_read_unlock(mm);
870
871out_put_mm:
872 mmput(mm);
873out_put_task:
874 put_task_struct(priv->task);
875 priv->task = NULL;
876
877 return ret;
878}
879#undef SEQ_PUT_DEC
880
881static const struct seq_operations proc_pid_smaps_op = {
882 .start = m_start,
883 .next = m_next,
884 .stop = m_stop,
885 .show = show_smap
886};
887
888static int pid_smaps_open(struct inode *inode, struct file *file)
889{
890 return do_maps_open(inode, file, &proc_pid_smaps_op);
891}
892
893static int smaps_rollup_open(struct inode *inode, struct file *file)
894{
895 int ret;
896 struct proc_maps_private *priv;
897
898 priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT);
899 if (!priv)
900 return -ENOMEM;
901
902 ret = single_open(file, show_smaps_rollup, priv);
903 if (ret)
904 goto out_free;
905
906 priv->inode = inode;
907 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
908 if (IS_ERR(priv->mm)) {
909 ret = PTR_ERR(priv->mm);
910
911 single_release(inode, file);
912 goto out_free;
913 }
914
915 return 0;
916
917out_free:
918 kfree(priv);
919 return ret;
920}
921
922static int smaps_rollup_release(struct inode *inode, struct file *file)
923{
924 struct seq_file *seq = file->private_data;
925 struct proc_maps_private *priv = seq->private;
926
927 if (priv->mm)
928 mmdrop(priv->mm);
929
930 kfree(priv);
931 return single_release(inode, file);
932}
933
934const struct file_operations proc_pid_smaps_operations = {
935 .open = pid_smaps_open,
936 .read = seq_read,
937 .llseek = seq_lseek,
938 .release = proc_map_release,
939};
940
941const struct file_operations proc_pid_smaps_rollup_operations = {
942 .open = smaps_rollup_open,
943 .read = seq_read,
944 .llseek = seq_lseek,
945 .release = smaps_rollup_release,
946};
947
948enum clear_refs_types {
949 CLEAR_REFS_ALL = 1,
950 CLEAR_REFS_ANON,
951 CLEAR_REFS_MAPPED,
952 CLEAR_REFS_SOFT_DIRTY,
953 CLEAR_REFS_MM_HIWATER_RSS,
954 CLEAR_REFS_LAST,
955};
956
957struct clear_refs_private {
958 enum clear_refs_types type;
959};
960
961#ifdef CONFIG_MEM_SOFT_DIRTY
962static inline void clear_soft_dirty(struct vm_area_struct *vma,
963 unsigned long addr, pte_t *pte)
964{
965 /*
966 * The soft-dirty tracker uses #PF-s to catch writes
967 * to pages, so write-protect the pte as well. See the
968 * Documentation/admin-guide/mm/soft-dirty.rst for full description
969 * of how soft-dirty works.
970 */
971 pte_t ptent = *pte;
972
973 if (pte_present(ptent)) {
974 pte_t old_pte;
975
976 old_pte = ptep_modify_prot_start(vma, addr, pte);
977 ptent = pte_wrprotect(old_pte);
978 ptent = pte_clear_soft_dirty(ptent);
979 ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent);
980 } else if (is_swap_pte(ptent)) {
981 ptent = pte_swp_clear_soft_dirty(ptent);
982 set_pte_at(vma->vm_mm, addr, pte, ptent);
983 }
984}
985#else
986static inline void clear_soft_dirty(struct vm_area_struct *vma,
987 unsigned long addr, pte_t *pte)
988{
989}
990#endif
991
992#if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
993static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
994 unsigned long addr, pmd_t *pmdp)
995{
996 pmd_t old, pmd = *pmdp;
997
998 if (pmd_present(pmd)) {
999 /* See comment in change_huge_pmd() */
1000 old = pmdp_invalidate(vma, addr, pmdp);
1001 if (pmd_dirty(old))
1002 pmd = pmd_mkdirty(pmd);
1003 if (pmd_young(old))
1004 pmd = pmd_mkyoung(pmd);
1005
1006 pmd = pmd_wrprotect(pmd);
1007 pmd = pmd_clear_soft_dirty(pmd);
1008
1009 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
1010 } else if (is_migration_entry(pmd_to_swp_entry(pmd))) {
1011 pmd = pmd_swp_clear_soft_dirty(pmd);
1012 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
1013 }
1014}
1015#else
1016static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
1017 unsigned long addr, pmd_t *pmdp)
1018{
1019}
1020#endif
1021
1022static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
1023 unsigned long end, struct mm_walk *walk)
1024{
1025 struct clear_refs_private *cp = walk->private;
1026 struct vm_area_struct *vma = walk->vma;
1027 pte_t *pte, ptent;
1028 spinlock_t *ptl;
1029 struct page *page;
1030
1031 ptl = pmd_trans_huge_lock(pmd, vma);
1032 if (ptl) {
1033 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
1034 clear_soft_dirty_pmd(vma, addr, pmd);
1035 goto out;
1036 }
1037
1038 if (!pmd_present(*pmd))
1039 goto out;
1040
1041 page = pmd_page(*pmd);
1042
1043 /* Clear accessed and referenced bits. */
1044 pmdp_test_and_clear_young(vma, addr, pmd);
1045 test_and_clear_page_young(page);
1046 ClearPageReferenced(page);
1047out:
1048 spin_unlock(ptl);
1049 return 0;
1050 }
1051
1052 if (pmd_trans_unstable(pmd))
1053 return 0;
1054
1055 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
1056 for (; addr != end; pte++, addr += PAGE_SIZE) {
1057 ptent = *pte;
1058
1059 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
1060 clear_soft_dirty(vma, addr, pte);
1061 continue;
1062 }
1063
1064 if (!pte_present(ptent))
1065 continue;
1066
1067 page = vm_normal_page(vma, addr, ptent);
1068 if (!page)
1069 continue;
1070
1071 /* Clear accessed and referenced bits. */
1072 ptep_test_and_clear_young(vma, addr, pte);
1073 test_and_clear_page_young(page);
1074 ClearPageReferenced(page);
1075 }
1076 pte_unmap_unlock(pte - 1, ptl);
1077 cond_resched();
1078 return 0;
1079}
1080
1081static int clear_refs_test_walk(unsigned long start, unsigned long end,
1082 struct mm_walk *walk)
1083{
1084 struct clear_refs_private *cp = walk->private;
1085 struct vm_area_struct *vma = walk->vma;
1086
1087 if (vma->vm_flags & VM_PFNMAP)
1088 return 1;
1089
1090 /*
1091 * Writing 1 to /proc/pid/clear_refs affects all pages.
1092 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
1093 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
1094 * Writing 4 to /proc/pid/clear_refs affects all pages.
1095 */
1096 if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
1097 return 1;
1098 if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
1099 return 1;
1100 return 0;
1101}
1102
1103static const struct mm_walk_ops clear_refs_walk_ops = {
1104 .pmd_entry = clear_refs_pte_range,
1105 .test_walk = clear_refs_test_walk,
1106};
1107
1108static ssize_t clear_refs_write(struct file *file, const char __user *buf,
1109 size_t count, loff_t *ppos)
1110{
1111 struct task_struct *task;
1112 char buffer[PROC_NUMBUF];
1113 struct mm_struct *mm;
1114 struct vm_area_struct *vma;
1115 enum clear_refs_types type;
1116 struct mmu_gather tlb;
1117 int itype;
1118 int rv;
1119
1120 memset(buffer, 0, sizeof(buffer));
1121 if (count > sizeof(buffer) - 1)
1122 count = sizeof(buffer) - 1;
1123 if (copy_from_user(buffer, buf, count))
1124 return -EFAULT;
1125 rv = kstrtoint(strstrip(buffer), 10, &itype);
1126 if (rv < 0)
1127 return rv;
1128 type = (enum clear_refs_types)itype;
1129 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
1130 return -EINVAL;
1131
1132 task = get_proc_task(file_inode(file));
1133 if (!task)
1134 return -ESRCH;
1135 mm = get_task_mm(task);
1136 if (mm) {
1137 struct mmu_notifier_range range;
1138 struct clear_refs_private cp = {
1139 .type = type,
1140 };
1141
1142 if (type == CLEAR_REFS_MM_HIWATER_RSS) {
1143 if (mmap_write_lock_killable(mm)) {
1144 count = -EINTR;
1145 goto out_mm;
1146 }
1147
1148 /*
1149 * Writing 5 to /proc/pid/clear_refs resets the peak
1150 * resident set size to this mm's current rss value.
1151 */
1152 reset_mm_hiwater_rss(mm);
1153 mmap_write_unlock(mm);
1154 goto out_mm;
1155 }
1156
1157 if (mmap_read_lock_killable(mm)) {
1158 count = -EINTR;
1159 goto out_mm;
1160 }
1161 tlb_gather_mmu(&tlb, mm, 0, -1);
1162 if (type == CLEAR_REFS_SOFT_DIRTY) {
1163 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1164 if (!(vma->vm_flags & VM_SOFTDIRTY))
1165 continue;
1166 mmap_read_unlock(mm);
1167 if (mmap_write_lock_killable(mm)) {
1168 count = -EINTR;
1169 goto out_mm;
1170 }
1171 /*
1172 * Avoid to modify vma->vm_flags
1173 * without locked ops while the
1174 * coredump reads the vm_flags.
1175 */
1176 if (!mmget_still_valid(mm)) {
1177 /*
1178 * Silently return "count"
1179 * like if get_task_mm()
1180 * failed. FIXME: should this
1181 * function have returned
1182 * -ESRCH if get_task_mm()
1183 * failed like if
1184 * get_proc_task() fails?
1185 */
1186 mmap_write_unlock(mm);
1187 goto out_mm;
1188 }
1189 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1190 vma->vm_flags &= ~VM_SOFTDIRTY;
1191 vma_set_page_prot(vma);
1192 }
1193 mmap_write_downgrade(mm);
1194 break;
1195 }
1196
1197 mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY,
1198 0, NULL, mm, 0, -1UL);
1199 mmu_notifier_invalidate_range_start(&range);
1200 }
1201 walk_page_range(mm, 0, mm->highest_vm_end, &clear_refs_walk_ops,
1202 &cp);
1203 if (type == CLEAR_REFS_SOFT_DIRTY)
1204 mmu_notifier_invalidate_range_end(&range);
1205 tlb_finish_mmu(&tlb, 0, -1);
1206 mmap_read_unlock(mm);
1207out_mm:
1208 mmput(mm);
1209 }
1210 put_task_struct(task);
1211
1212 return count;
1213}
1214
1215const struct file_operations proc_clear_refs_operations = {
1216 .write = clear_refs_write,
1217 .llseek = noop_llseek,
1218};
1219
1220typedef struct {
1221 u64 pme;
1222} pagemap_entry_t;
1223
1224struct pagemapread {
1225 int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
1226 pagemap_entry_t *buffer;
1227 bool show_pfn;
1228};
1229
1230#define PAGEMAP_WALK_SIZE (PMD_SIZE)
1231#define PAGEMAP_WALK_MASK (PMD_MASK)
1232
1233#define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1234#define PM_PFRAME_BITS 55
1235#define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1236#define PM_SOFT_DIRTY BIT_ULL(55)
1237#define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1238#define PM_FILE BIT_ULL(61)
1239#define PM_SWAP BIT_ULL(62)
1240#define PM_PRESENT BIT_ULL(63)
1241
1242#define PM_END_OF_BUFFER 1
1243
1244static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
1245{
1246 return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags };
1247}
1248
1249static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
1250 struct pagemapread *pm)
1251{
1252 pm->buffer[pm->pos++] = *pme;
1253 if (pm->pos >= pm->len)
1254 return PM_END_OF_BUFFER;
1255 return 0;
1256}
1257
1258static int pagemap_pte_hole(unsigned long start, unsigned long end,
1259 __always_unused int depth, struct mm_walk *walk)
1260{
1261 struct pagemapread *pm = walk->private;
1262 unsigned long addr = start;
1263 int err = 0;
1264
1265 while (addr < end) {
1266 struct vm_area_struct *vma = find_vma(walk->mm, addr);
1267 pagemap_entry_t pme = make_pme(0, 0);
1268 /* End of address space hole, which we mark as non-present. */
1269 unsigned long hole_end;
1270
1271 if (vma)
1272 hole_end = min(end, vma->vm_start);
1273 else
1274 hole_end = end;
1275
1276 for (; addr < hole_end; addr += PAGE_SIZE) {
1277 err = add_to_pagemap(addr, &pme, pm);
1278 if (err)
1279 goto out;
1280 }
1281
1282 if (!vma)
1283 break;
1284
1285 /* Addresses in the VMA. */
1286 if (vma->vm_flags & VM_SOFTDIRTY)
1287 pme = make_pme(0, PM_SOFT_DIRTY);
1288 for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
1289 err = add_to_pagemap(addr, &pme, pm);
1290 if (err)
1291 goto out;
1292 }
1293 }
1294out:
1295 return err;
1296}
1297
1298static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
1299 struct vm_area_struct *vma, unsigned long addr, pte_t pte)
1300{
1301 u64 frame = 0, flags = 0;
1302 struct page *page = NULL;
1303
1304 if (pte_present(pte)) {
1305 if (pm->show_pfn)
1306 frame = pte_pfn(pte);
1307 flags |= PM_PRESENT;
1308 page = vm_normal_page(vma, addr, pte);
1309 if (pte_soft_dirty(pte))
1310 flags |= PM_SOFT_DIRTY;
1311 } else if (is_swap_pte(pte)) {
1312 swp_entry_t entry;
1313 if (pte_swp_soft_dirty(pte))
1314 flags |= PM_SOFT_DIRTY;
1315 entry = pte_to_swp_entry(pte);
1316 if (pm->show_pfn)
1317 frame = swp_type(entry) |
1318 (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
1319 flags |= PM_SWAP;
1320 if (is_migration_entry(entry))
1321 page = migration_entry_to_page(entry);
1322
1323 if (is_device_private_entry(entry))
1324 page = device_private_entry_to_page(entry);
1325 }
1326
1327 if (page && !PageAnon(page))
1328 flags |= PM_FILE;
1329 if (page && page_mapcount(page) == 1)
1330 flags |= PM_MMAP_EXCLUSIVE;
1331 if (vma->vm_flags & VM_SOFTDIRTY)
1332 flags |= PM_SOFT_DIRTY;
1333
1334 return make_pme(frame, flags);
1335}
1336
1337static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
1338 struct mm_walk *walk)
1339{
1340 struct vm_area_struct *vma = walk->vma;
1341 struct pagemapread *pm = walk->private;
1342 spinlock_t *ptl;
1343 pte_t *pte, *orig_pte;
1344 int err = 0;
1345
1346#ifdef CONFIG_TRANSPARENT_HUGEPAGE
1347 ptl = pmd_trans_huge_lock(pmdp, vma);
1348 if (ptl) {
1349 u64 flags = 0, frame = 0;
1350 pmd_t pmd = *pmdp;
1351 struct page *page = NULL;
1352
1353 if (vma->vm_flags & VM_SOFTDIRTY)
1354 flags |= PM_SOFT_DIRTY;
1355
1356 if (pmd_present(pmd)) {
1357 page = pmd_page(pmd);
1358
1359 flags |= PM_PRESENT;
1360 if (pmd_soft_dirty(pmd))
1361 flags |= PM_SOFT_DIRTY;
1362 if (pm->show_pfn)
1363 frame = pmd_pfn(pmd) +
1364 ((addr & ~PMD_MASK) >> PAGE_SHIFT);
1365 }
1366#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1367 else if (is_swap_pmd(pmd)) {
1368 swp_entry_t entry = pmd_to_swp_entry(pmd);
1369 unsigned long offset;
1370
1371 if (pm->show_pfn) {
1372 offset = swp_offset(entry) +
1373 ((addr & ~PMD_MASK) >> PAGE_SHIFT);
1374 frame = swp_type(entry) |
1375 (offset << MAX_SWAPFILES_SHIFT);
1376 }
1377 flags |= PM_SWAP;
1378 if (pmd_swp_soft_dirty(pmd))
1379 flags |= PM_SOFT_DIRTY;
1380 VM_BUG_ON(!is_pmd_migration_entry(pmd));
1381 page = migration_entry_to_page(entry);
1382 }
1383#endif
1384
1385 if (page && page_mapcount(page) == 1)
1386 flags |= PM_MMAP_EXCLUSIVE;
1387
1388 for (; addr != end; addr += PAGE_SIZE) {
1389 pagemap_entry_t pme = make_pme(frame, flags);
1390
1391 err = add_to_pagemap(addr, &pme, pm);
1392 if (err)
1393 break;
1394 if (pm->show_pfn) {
1395 if (flags & PM_PRESENT)
1396 frame++;
1397 else if (flags & PM_SWAP)
1398 frame += (1 << MAX_SWAPFILES_SHIFT);
1399 }
1400 }
1401 spin_unlock(ptl);
1402 return err;
1403 }
1404
1405 if (pmd_trans_unstable(pmdp))
1406 return 0;
1407#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1408
1409 /*
1410 * We can assume that @vma always points to a valid one and @end never
1411 * goes beyond vma->vm_end.
1412 */
1413 orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
1414 for (; addr < end; pte++, addr += PAGE_SIZE) {
1415 pagemap_entry_t pme;
1416
1417 pme = pte_to_pagemap_entry(pm, vma, addr, *pte);
1418 err = add_to_pagemap(addr, &pme, pm);
1419 if (err)
1420 break;
1421 }
1422 pte_unmap_unlock(orig_pte, ptl);
1423
1424 cond_resched();
1425
1426 return err;
1427}
1428
1429#ifdef CONFIG_HUGETLB_PAGE
1430/* This function walks within one hugetlb entry in the single call */
1431static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
1432 unsigned long addr, unsigned long end,
1433 struct mm_walk *walk)
1434{
1435 struct pagemapread *pm = walk->private;
1436 struct vm_area_struct *vma = walk->vma;
1437 u64 flags = 0, frame = 0;
1438 int err = 0;
1439 pte_t pte;
1440
1441 if (vma->vm_flags & VM_SOFTDIRTY)
1442 flags |= PM_SOFT_DIRTY;
1443
1444 pte = huge_ptep_get(ptep);
1445 if (pte_present(pte)) {
1446 struct page *page = pte_page(pte);
1447
1448 if (!PageAnon(page))
1449 flags |= PM_FILE;
1450
1451 if (page_mapcount(page) == 1)
1452 flags |= PM_MMAP_EXCLUSIVE;
1453
1454 flags |= PM_PRESENT;
1455 if (pm->show_pfn)
1456 frame = pte_pfn(pte) +
1457 ((addr & ~hmask) >> PAGE_SHIFT);
1458 }
1459
1460 for (; addr != end; addr += PAGE_SIZE) {
1461 pagemap_entry_t pme = make_pme(frame, flags);
1462
1463 err = add_to_pagemap(addr, &pme, pm);
1464 if (err)
1465 return err;
1466 if (pm->show_pfn && (flags & PM_PRESENT))
1467 frame++;
1468 }
1469
1470 cond_resched();
1471
1472 return err;
1473}
1474#else
1475#define pagemap_hugetlb_range NULL
1476#endif /* HUGETLB_PAGE */
1477
1478static const struct mm_walk_ops pagemap_ops = {
1479 .pmd_entry = pagemap_pmd_range,
1480 .pte_hole = pagemap_pte_hole,
1481 .hugetlb_entry = pagemap_hugetlb_range,
1482};
1483
1484/*
1485 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1486 *
1487 * For each page in the address space, this file contains one 64-bit entry
1488 * consisting of the following:
1489 *
1490 * Bits 0-54 page frame number (PFN) if present
1491 * Bits 0-4 swap type if swapped
1492 * Bits 5-54 swap offset if swapped
1493 * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst)
1494 * Bit 56 page exclusively mapped
1495 * Bits 57-60 zero
1496 * Bit 61 page is file-page or shared-anon
1497 * Bit 62 page swapped
1498 * Bit 63 page present
1499 *
1500 * If the page is not present but in swap, then the PFN contains an
1501 * encoding of the swap file number and the page's offset into the
1502 * swap. Unmapped pages return a null PFN. This allows determining
1503 * precisely which pages are mapped (or in swap) and comparing mapped
1504 * pages between processes.
1505 *
1506 * Efficient users of this interface will use /proc/pid/maps to
1507 * determine which areas of memory are actually mapped and llseek to
1508 * skip over unmapped regions.
1509 */
1510static ssize_t pagemap_read(struct file *file, char __user *buf,
1511 size_t count, loff_t *ppos)
1512{
1513 struct mm_struct *mm = file->private_data;
1514 struct pagemapread pm;
1515 unsigned long src;
1516 unsigned long svpfn;
1517 unsigned long start_vaddr;
1518 unsigned long end_vaddr;
1519 int ret = 0, copied = 0;
1520
1521 if (!mm || !mmget_not_zero(mm))
1522 goto out;
1523
1524 ret = -EINVAL;
1525 /* file position must be aligned */
1526 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
1527 goto out_mm;
1528
1529 ret = 0;
1530 if (!count)
1531 goto out_mm;
1532
1533 /* do not disclose physical addresses: attack vector */
1534 pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
1535
1536 pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
1537 pm.buffer = kmalloc_array(pm.len, PM_ENTRY_BYTES, GFP_KERNEL);
1538 ret = -ENOMEM;
1539 if (!pm.buffer)
1540 goto out_mm;
1541
1542 src = *ppos;
1543 svpfn = src / PM_ENTRY_BYTES;
1544 start_vaddr = svpfn << PAGE_SHIFT;
1545 end_vaddr = mm->task_size;
1546
1547 /* watch out for wraparound */
1548 if (svpfn > mm->task_size >> PAGE_SHIFT)
1549 start_vaddr = end_vaddr;
1550
1551 /*
1552 * The odds are that this will stop walking way
1553 * before end_vaddr, because the length of the
1554 * user buffer is tracked in "pm", and the walk
1555 * will stop when we hit the end of the buffer.
1556 */
1557 ret = 0;
1558 while (count && (start_vaddr < end_vaddr)) {
1559 int len;
1560 unsigned long end;
1561
1562 pm.pos = 0;
1563 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
1564 /* overflow ? */
1565 if (end < start_vaddr || end > end_vaddr)
1566 end = end_vaddr;
1567 ret = mmap_read_lock_killable(mm);
1568 if (ret)
1569 goto out_free;
1570 ret = walk_page_range(mm, start_vaddr, end, &pagemap_ops, &pm);
1571 mmap_read_unlock(mm);
1572 start_vaddr = end;
1573
1574 len = min(count, PM_ENTRY_BYTES * pm.pos);
1575 if (copy_to_user(buf, pm.buffer, len)) {
1576 ret = -EFAULT;
1577 goto out_free;
1578 }
1579 copied += len;
1580 buf += len;
1581 count -= len;
1582 }
1583 *ppos += copied;
1584 if (!ret || ret == PM_END_OF_BUFFER)
1585 ret = copied;
1586
1587out_free:
1588 kfree(pm.buffer);
1589out_mm:
1590 mmput(mm);
1591out:
1592 return ret;
1593}
1594
1595static int pagemap_open(struct inode *inode, struct file *file)
1596{
1597 struct mm_struct *mm;
1598
1599 mm = proc_mem_open(inode, PTRACE_MODE_READ);
1600 if (IS_ERR(mm))
1601 return PTR_ERR(mm);
1602 file->private_data = mm;
1603 return 0;
1604}
1605
1606static int pagemap_release(struct inode *inode, struct file *file)
1607{
1608 struct mm_struct *mm = file->private_data;
1609
1610 if (mm)
1611 mmdrop(mm);
1612 return 0;
1613}
1614
1615const struct file_operations proc_pagemap_operations = {
1616 .llseek = mem_lseek, /* borrow this */
1617 .read = pagemap_read,
1618 .open = pagemap_open,
1619 .release = pagemap_release,
1620};
1621#endif /* CONFIG_PROC_PAGE_MONITOR */
1622
1623#ifdef CONFIG_NUMA
1624
1625struct numa_maps {
1626 unsigned long pages;
1627 unsigned long anon;
1628 unsigned long active;
1629 unsigned long writeback;
1630 unsigned long mapcount_max;
1631 unsigned long dirty;
1632 unsigned long swapcache;
1633 unsigned long node[MAX_NUMNODES];
1634};
1635
1636struct numa_maps_private {
1637 struct proc_maps_private proc_maps;
1638 struct numa_maps md;
1639};
1640
1641static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1642 unsigned long nr_pages)
1643{
1644 int count = page_mapcount(page);
1645
1646 md->pages += nr_pages;
1647 if (pte_dirty || PageDirty(page))
1648 md->dirty += nr_pages;
1649
1650 if (PageSwapCache(page))
1651 md->swapcache += nr_pages;
1652
1653 if (PageActive(page) || PageUnevictable(page))
1654 md->active += nr_pages;
1655
1656 if (PageWriteback(page))
1657 md->writeback += nr_pages;
1658
1659 if (PageAnon(page))
1660 md->anon += nr_pages;
1661
1662 if (count > md->mapcount_max)
1663 md->mapcount_max = count;
1664
1665 md->node[page_to_nid(page)] += nr_pages;
1666}
1667
1668static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1669 unsigned long addr)
1670{
1671 struct page *page;
1672 int nid;
1673
1674 if (!pte_present(pte))
1675 return NULL;
1676
1677 page = vm_normal_page(vma, addr, pte);
1678 if (!page)
1679 return NULL;
1680
1681 if (PageReserved(page))
1682 return NULL;
1683
1684 nid = page_to_nid(page);
1685 if (!node_isset(nid, node_states[N_MEMORY]))
1686 return NULL;
1687
1688 return page;
1689}
1690
1691#ifdef CONFIG_TRANSPARENT_HUGEPAGE
1692static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
1693 struct vm_area_struct *vma,
1694 unsigned long addr)
1695{
1696 struct page *page;
1697 int nid;
1698
1699 if (!pmd_present(pmd))
1700 return NULL;
1701
1702 page = vm_normal_page_pmd(vma, addr, pmd);
1703 if (!page)
1704 return NULL;
1705
1706 if (PageReserved(page))
1707 return NULL;
1708
1709 nid = page_to_nid(page);
1710 if (!node_isset(nid, node_states[N_MEMORY]))
1711 return NULL;
1712
1713 return page;
1714}
1715#endif
1716
1717static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1718 unsigned long end, struct mm_walk *walk)
1719{
1720 struct numa_maps *md = walk->private;
1721 struct vm_area_struct *vma = walk->vma;
1722 spinlock_t *ptl;
1723 pte_t *orig_pte;
1724 pte_t *pte;
1725
1726#ifdef CONFIG_TRANSPARENT_HUGEPAGE
1727 ptl = pmd_trans_huge_lock(pmd, vma);
1728 if (ptl) {
1729 struct page *page;
1730
1731 page = can_gather_numa_stats_pmd(*pmd, vma, addr);
1732 if (page)
1733 gather_stats(page, md, pmd_dirty(*pmd),
1734 HPAGE_PMD_SIZE/PAGE_SIZE);
1735 spin_unlock(ptl);
1736 return 0;
1737 }
1738
1739 if (pmd_trans_unstable(pmd))
1740 return 0;
1741#endif
1742 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1743 do {
1744 struct page *page = can_gather_numa_stats(*pte, vma, addr);
1745 if (!page)
1746 continue;
1747 gather_stats(page, md, pte_dirty(*pte), 1);
1748
1749 } while (pte++, addr += PAGE_SIZE, addr != end);
1750 pte_unmap_unlock(orig_pte, ptl);
1751 cond_resched();
1752 return 0;
1753}
1754#ifdef CONFIG_HUGETLB_PAGE
1755static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1756 unsigned long addr, unsigned long end, struct mm_walk *walk)
1757{
1758 pte_t huge_pte = huge_ptep_get(pte);
1759 struct numa_maps *md;
1760 struct page *page;
1761
1762 if (!pte_present(huge_pte))
1763 return 0;
1764
1765 page = pte_page(huge_pte);
1766 if (!page)
1767 return 0;
1768
1769 md = walk->private;
1770 gather_stats(page, md, pte_dirty(huge_pte), 1);
1771 return 0;
1772}
1773
1774#else
1775static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1776 unsigned long addr, unsigned long end, struct mm_walk *walk)
1777{
1778 return 0;
1779}
1780#endif
1781
1782static const struct mm_walk_ops show_numa_ops = {
1783 .hugetlb_entry = gather_hugetlb_stats,
1784 .pmd_entry = gather_pte_stats,
1785};
1786
1787/*
1788 * Display pages allocated per node and memory policy via /proc.
1789 */
1790static int show_numa_map(struct seq_file *m, void *v)
1791{
1792 struct numa_maps_private *numa_priv = m->private;
1793 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
1794 struct vm_area_struct *vma = v;
1795 struct numa_maps *md = &numa_priv->md;
1796 struct file *file = vma->vm_file;
1797 struct mm_struct *mm = vma->vm_mm;
1798 struct mempolicy *pol;
1799 char buffer[64];
1800 int nid;
1801
1802 if (!mm)
1803 return 0;
1804
1805 /* Ensure we start with an empty set of numa_maps statistics. */
1806 memset(md, 0, sizeof(*md));
1807
1808 pol = __get_vma_policy(vma, vma->vm_start);
1809 if (pol) {
1810 mpol_to_str(buffer, sizeof(buffer), pol);
1811 mpol_cond_put(pol);
1812 } else {
1813 mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy);
1814 }
1815
1816 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1817
1818 if (file) {
1819 seq_puts(m, " file=");
1820 seq_file_path(m, file, "\n\t= ");
1821 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1822 seq_puts(m, " heap");
1823 } else if (is_stack(vma)) {
1824 seq_puts(m, " stack");
1825 }
1826
1827 if (is_vm_hugetlb_page(vma))
1828 seq_puts(m, " huge");
1829
1830 /* mmap_lock is held by m_start */
1831 walk_page_vma(vma, &show_numa_ops, md);
1832
1833 if (!md->pages)
1834 goto out;
1835
1836 if (md->anon)
1837 seq_printf(m, " anon=%lu", md->anon);
1838
1839 if (md->dirty)
1840 seq_printf(m, " dirty=%lu", md->dirty);
1841
1842 if (md->pages != md->anon && md->pages != md->dirty)
1843 seq_printf(m, " mapped=%lu", md->pages);
1844
1845 if (md->mapcount_max > 1)
1846 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1847
1848 if (md->swapcache)
1849 seq_printf(m, " swapcache=%lu", md->swapcache);
1850
1851 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1852 seq_printf(m, " active=%lu", md->active);
1853
1854 if (md->writeback)
1855 seq_printf(m, " writeback=%lu", md->writeback);
1856
1857 for_each_node_state(nid, N_MEMORY)
1858 if (md->node[nid])
1859 seq_printf(m, " N%d=%lu", nid, md->node[nid]);
1860
1861 seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
1862out:
1863 seq_putc(m, '\n');
1864 return 0;
1865}
1866
1867static const struct seq_operations proc_pid_numa_maps_op = {
1868 .start = m_start,
1869 .next = m_next,
1870 .stop = m_stop,
1871 .show = show_numa_map,
1872};
1873
1874static int pid_numa_maps_open(struct inode *inode, struct file *file)
1875{
1876 return proc_maps_open(inode, file, &proc_pid_numa_maps_op,
1877 sizeof(struct numa_maps_private));
1878}
1879
1880const struct file_operations proc_pid_numa_maps_operations = {
1881 .open = pid_numa_maps_open,
1882 .read = seq_read,
1883 .llseek = seq_lseek,
1884 .release = proc_map_release,
1885};
1886
1887#endif /* CONFIG_NUMA */
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/mm.h>
3#include <linux/vmacache.h>
4#include <linux/hugetlb.h>
5#include <linux/huge_mm.h>
6#include <linux/mount.h>
7#include <linux/seq_file.h>
8#include <linux/highmem.h>
9#include <linux/ptrace.h>
10#include <linux/slab.h>
11#include <linux/pagemap.h>
12#include <linux/mempolicy.h>
13#include <linux/rmap.h>
14#include <linux/swap.h>
15#include <linux/sched/mm.h>
16#include <linux/swapops.h>
17#include <linux/mmu_notifier.h>
18#include <linux/page_idle.h>
19#include <linux/shmem_fs.h>
20#include <linux/uaccess.h>
21
22#include <asm/elf.h>
23#include <asm/tlb.h>
24#include <asm/tlbflush.h>
25#include "internal.h"
26
27#define SEQ_PUT_DEC(str, val) \
28 seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8)
29void task_mem(struct seq_file *m, struct mm_struct *mm)
30{
31 unsigned long text, lib, swap, anon, file, shmem;
32 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
33
34 anon = get_mm_counter(mm, MM_ANONPAGES);
35 file = get_mm_counter(mm, MM_FILEPAGES);
36 shmem = get_mm_counter(mm, MM_SHMEMPAGES);
37
38 /*
39 * Note: to minimize their overhead, mm maintains hiwater_vm and
40 * hiwater_rss only when about to *lower* total_vm or rss. Any
41 * collector of these hiwater stats must therefore get total_vm
42 * and rss too, which will usually be the higher. Barriers? not
43 * worth the effort, such snapshots can always be inconsistent.
44 */
45 hiwater_vm = total_vm = mm->total_vm;
46 if (hiwater_vm < mm->hiwater_vm)
47 hiwater_vm = mm->hiwater_vm;
48 hiwater_rss = total_rss = anon + file + shmem;
49 if (hiwater_rss < mm->hiwater_rss)
50 hiwater_rss = mm->hiwater_rss;
51
52 /* split executable areas between text and lib */
53 text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK);
54 text = min(text, mm->exec_vm << PAGE_SHIFT);
55 lib = (mm->exec_vm << PAGE_SHIFT) - text;
56
57 swap = get_mm_counter(mm, MM_SWAPENTS);
58 SEQ_PUT_DEC("VmPeak:\t", hiwater_vm);
59 SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm);
60 SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm);
61 SEQ_PUT_DEC(" kB\nVmPin:\t", mm->pinned_vm);
62 SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss);
63 SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss);
64 SEQ_PUT_DEC(" kB\nRssAnon:\t", anon);
65 SEQ_PUT_DEC(" kB\nRssFile:\t", file);
66 SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem);
67 SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm);
68 SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm);
69 seq_put_decimal_ull_width(m,
70 " kB\nVmExe:\t", text >> 10, 8);
71 seq_put_decimal_ull_width(m,
72 " kB\nVmLib:\t", lib >> 10, 8);
73 seq_put_decimal_ull_width(m,
74 " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8);
75 SEQ_PUT_DEC(" kB\nVmSwap:\t", swap);
76 seq_puts(m, " kB\n");
77 hugetlb_report_usage(m, mm);
78}
79#undef SEQ_PUT_DEC
80
81unsigned long task_vsize(struct mm_struct *mm)
82{
83 return PAGE_SIZE * mm->total_vm;
84}
85
86unsigned long task_statm(struct mm_struct *mm,
87 unsigned long *shared, unsigned long *text,
88 unsigned long *data, unsigned long *resident)
89{
90 *shared = get_mm_counter(mm, MM_FILEPAGES) +
91 get_mm_counter(mm, MM_SHMEMPAGES);
92 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
93 >> PAGE_SHIFT;
94 *data = mm->data_vm + mm->stack_vm;
95 *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
96 return mm->total_vm;
97}
98
99#ifdef CONFIG_NUMA
100/*
101 * Save get_task_policy() for show_numa_map().
102 */
103static void hold_task_mempolicy(struct proc_maps_private *priv)
104{
105 struct task_struct *task = priv->task;
106
107 task_lock(task);
108 priv->task_mempolicy = get_task_policy(task);
109 mpol_get(priv->task_mempolicy);
110 task_unlock(task);
111}
112static void release_task_mempolicy(struct proc_maps_private *priv)
113{
114 mpol_put(priv->task_mempolicy);
115}
116#else
117static void hold_task_mempolicy(struct proc_maps_private *priv)
118{
119}
120static void release_task_mempolicy(struct proc_maps_private *priv)
121{
122}
123#endif
124
125static void vma_stop(struct proc_maps_private *priv)
126{
127 struct mm_struct *mm = priv->mm;
128
129 release_task_mempolicy(priv);
130 up_read(&mm->mmap_sem);
131 mmput(mm);
132}
133
134static struct vm_area_struct *
135m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma)
136{
137 if (vma == priv->tail_vma)
138 return NULL;
139 return vma->vm_next ?: priv->tail_vma;
140}
141
142static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma)
143{
144 if (m->count < m->size) /* vma is copied successfully */
145 m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL;
146}
147
148static void *m_start(struct seq_file *m, loff_t *ppos)
149{
150 struct proc_maps_private *priv = m->private;
151 unsigned long last_addr = m->version;
152 struct mm_struct *mm;
153 struct vm_area_struct *vma;
154 unsigned int pos = *ppos;
155
156 /* See m_cache_vma(). Zero at the start or after lseek. */
157 if (last_addr == -1UL)
158 return NULL;
159
160 priv->task = get_proc_task(priv->inode);
161 if (!priv->task)
162 return ERR_PTR(-ESRCH);
163
164 mm = priv->mm;
165 if (!mm || !mmget_not_zero(mm))
166 return NULL;
167
168 down_read(&mm->mmap_sem);
169 hold_task_mempolicy(priv);
170 priv->tail_vma = get_gate_vma(mm);
171
172 if (last_addr) {
173 vma = find_vma(mm, last_addr - 1);
174 if (vma && vma->vm_start <= last_addr)
175 vma = m_next_vma(priv, vma);
176 if (vma)
177 return vma;
178 }
179
180 m->version = 0;
181 if (pos < mm->map_count) {
182 for (vma = mm->mmap; pos; pos--) {
183 m->version = vma->vm_start;
184 vma = vma->vm_next;
185 }
186 return vma;
187 }
188
189 /* we do not bother to update m->version in this case */
190 if (pos == mm->map_count && priv->tail_vma)
191 return priv->tail_vma;
192
193 vma_stop(priv);
194 return NULL;
195}
196
197static void *m_next(struct seq_file *m, void *v, loff_t *pos)
198{
199 struct proc_maps_private *priv = m->private;
200 struct vm_area_struct *next;
201
202 (*pos)++;
203 next = m_next_vma(priv, v);
204 if (!next)
205 vma_stop(priv);
206 return next;
207}
208
209static void m_stop(struct seq_file *m, void *v)
210{
211 struct proc_maps_private *priv = m->private;
212
213 if (!IS_ERR_OR_NULL(v))
214 vma_stop(priv);
215 if (priv->task) {
216 put_task_struct(priv->task);
217 priv->task = NULL;
218 }
219}
220
221static int proc_maps_open(struct inode *inode, struct file *file,
222 const struct seq_operations *ops, int psize)
223{
224 struct proc_maps_private *priv = __seq_open_private(file, ops, psize);
225
226 if (!priv)
227 return -ENOMEM;
228
229 priv->inode = inode;
230 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
231 if (IS_ERR(priv->mm)) {
232 int err = PTR_ERR(priv->mm);
233
234 seq_release_private(inode, file);
235 return err;
236 }
237
238 return 0;
239}
240
241static int proc_map_release(struct inode *inode, struct file *file)
242{
243 struct seq_file *seq = file->private_data;
244 struct proc_maps_private *priv = seq->private;
245
246 if (priv->mm)
247 mmdrop(priv->mm);
248
249 kfree(priv->rollup);
250 return seq_release_private(inode, file);
251}
252
253static int do_maps_open(struct inode *inode, struct file *file,
254 const struct seq_operations *ops)
255{
256 return proc_maps_open(inode, file, ops,
257 sizeof(struct proc_maps_private));
258}
259
260/*
261 * Indicate if the VMA is a stack for the given task; for
262 * /proc/PID/maps that is the stack of the main task.
263 */
264static int is_stack(struct vm_area_struct *vma)
265{
266 /*
267 * We make no effort to guess what a given thread considers to be
268 * its "stack". It's not even well-defined for programs written
269 * languages like Go.
270 */
271 return vma->vm_start <= vma->vm_mm->start_stack &&
272 vma->vm_end >= vma->vm_mm->start_stack;
273}
274
275static void show_vma_header_prefix(struct seq_file *m,
276 unsigned long start, unsigned long end,
277 vm_flags_t flags, unsigned long long pgoff,
278 dev_t dev, unsigned long ino)
279{
280 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
281 seq_put_hex_ll(m, NULL, start, 8);
282 seq_put_hex_ll(m, "-", end, 8);
283 seq_putc(m, ' ');
284 seq_putc(m, flags & VM_READ ? 'r' : '-');
285 seq_putc(m, flags & VM_WRITE ? 'w' : '-');
286 seq_putc(m, flags & VM_EXEC ? 'x' : '-');
287 seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p');
288 seq_put_hex_ll(m, " ", pgoff, 8);
289 seq_put_hex_ll(m, " ", MAJOR(dev), 2);
290 seq_put_hex_ll(m, ":", MINOR(dev), 2);
291 seq_put_decimal_ull(m, " ", ino);
292 seq_putc(m, ' ');
293}
294
295static void
296show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
297{
298 struct mm_struct *mm = vma->vm_mm;
299 struct file *file = vma->vm_file;
300 vm_flags_t flags = vma->vm_flags;
301 unsigned long ino = 0;
302 unsigned long long pgoff = 0;
303 unsigned long start, end;
304 dev_t dev = 0;
305 const char *name = NULL;
306
307 if (file) {
308 struct inode *inode = file_inode(vma->vm_file);
309 dev = inode->i_sb->s_dev;
310 ino = inode->i_ino;
311 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
312 }
313
314 start = vma->vm_start;
315 end = vma->vm_end;
316 show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
317
318 /*
319 * Print the dentry name for named mappings, and a
320 * special [heap] marker for the heap:
321 */
322 if (file) {
323 seq_pad(m, ' ');
324 seq_file_path(m, file, "\n");
325 goto done;
326 }
327
328 if (vma->vm_ops && vma->vm_ops->name) {
329 name = vma->vm_ops->name(vma);
330 if (name)
331 goto done;
332 }
333
334 name = arch_vma_name(vma);
335 if (!name) {
336 if (!mm) {
337 name = "[vdso]";
338 goto done;
339 }
340
341 if (vma->vm_start <= mm->brk &&
342 vma->vm_end >= mm->start_brk) {
343 name = "[heap]";
344 goto done;
345 }
346
347 if (is_stack(vma))
348 name = "[stack]";
349 }
350
351done:
352 if (name) {
353 seq_pad(m, ' ');
354 seq_puts(m, name);
355 }
356 seq_putc(m, '\n');
357}
358
359static int show_map(struct seq_file *m, void *v, int is_pid)
360{
361 show_map_vma(m, v, is_pid);
362 m_cache_vma(m, v);
363 return 0;
364}
365
366static int show_pid_map(struct seq_file *m, void *v)
367{
368 return show_map(m, v, 1);
369}
370
371static int show_tid_map(struct seq_file *m, void *v)
372{
373 return show_map(m, v, 0);
374}
375
376static const struct seq_operations proc_pid_maps_op = {
377 .start = m_start,
378 .next = m_next,
379 .stop = m_stop,
380 .show = show_pid_map
381};
382
383static const struct seq_operations proc_tid_maps_op = {
384 .start = m_start,
385 .next = m_next,
386 .stop = m_stop,
387 .show = show_tid_map
388};
389
390static int pid_maps_open(struct inode *inode, struct file *file)
391{
392 return do_maps_open(inode, file, &proc_pid_maps_op);
393}
394
395static int tid_maps_open(struct inode *inode, struct file *file)
396{
397 return do_maps_open(inode, file, &proc_tid_maps_op);
398}
399
400const struct file_operations proc_pid_maps_operations = {
401 .open = pid_maps_open,
402 .read = seq_read,
403 .llseek = seq_lseek,
404 .release = proc_map_release,
405};
406
407const struct file_operations proc_tid_maps_operations = {
408 .open = tid_maps_open,
409 .read = seq_read,
410 .llseek = seq_lseek,
411 .release = proc_map_release,
412};
413
414/*
415 * Proportional Set Size(PSS): my share of RSS.
416 *
417 * PSS of a process is the count of pages it has in memory, where each
418 * page is divided by the number of processes sharing it. So if a
419 * process has 1000 pages all to itself, and 1000 shared with one other
420 * process, its PSS will be 1500.
421 *
422 * To keep (accumulated) division errors low, we adopt a 64bit
423 * fixed-point pss counter to minimize division errors. So (pss >>
424 * PSS_SHIFT) would be the real byte count.
425 *
426 * A shift of 12 before division means (assuming 4K page size):
427 * - 1M 3-user-pages add up to 8KB errors;
428 * - supports mapcount up to 2^24, or 16M;
429 * - supports PSS up to 2^52 bytes, or 4PB.
430 */
431#define PSS_SHIFT 12
432
433#ifdef CONFIG_PROC_PAGE_MONITOR
434struct mem_size_stats {
435 bool first;
436 unsigned long resident;
437 unsigned long shared_clean;
438 unsigned long shared_dirty;
439 unsigned long private_clean;
440 unsigned long private_dirty;
441 unsigned long referenced;
442 unsigned long anonymous;
443 unsigned long lazyfree;
444 unsigned long anonymous_thp;
445 unsigned long shmem_thp;
446 unsigned long swap;
447 unsigned long shared_hugetlb;
448 unsigned long private_hugetlb;
449 unsigned long first_vma_start;
450 u64 pss;
451 u64 pss_locked;
452 u64 swap_pss;
453 bool check_shmem_swap;
454};
455
456static void smaps_account(struct mem_size_stats *mss, struct page *page,
457 bool compound, bool young, bool dirty)
458{
459 int i, nr = compound ? 1 << compound_order(page) : 1;
460 unsigned long size = nr * PAGE_SIZE;
461
462 if (PageAnon(page)) {
463 mss->anonymous += size;
464 if (!PageSwapBacked(page) && !dirty && !PageDirty(page))
465 mss->lazyfree += size;
466 }
467
468 mss->resident += size;
469 /* Accumulate the size in pages that have been accessed. */
470 if (young || page_is_young(page) || PageReferenced(page))
471 mss->referenced += size;
472
473 /*
474 * page_count(page) == 1 guarantees the page is mapped exactly once.
475 * If any subpage of the compound page mapped with PTE it would elevate
476 * page_count().
477 */
478 if (page_count(page) == 1) {
479 if (dirty || PageDirty(page))
480 mss->private_dirty += size;
481 else
482 mss->private_clean += size;
483 mss->pss += (u64)size << PSS_SHIFT;
484 return;
485 }
486
487 for (i = 0; i < nr; i++, page++) {
488 int mapcount = page_mapcount(page);
489
490 if (mapcount >= 2) {
491 if (dirty || PageDirty(page))
492 mss->shared_dirty += PAGE_SIZE;
493 else
494 mss->shared_clean += PAGE_SIZE;
495 mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
496 } else {
497 if (dirty || PageDirty(page))
498 mss->private_dirty += PAGE_SIZE;
499 else
500 mss->private_clean += PAGE_SIZE;
501 mss->pss += PAGE_SIZE << PSS_SHIFT;
502 }
503 }
504}
505
506#ifdef CONFIG_SHMEM
507static int smaps_pte_hole(unsigned long addr, unsigned long end,
508 struct mm_walk *walk)
509{
510 struct mem_size_stats *mss = walk->private;
511
512 mss->swap += shmem_partial_swap_usage(
513 walk->vma->vm_file->f_mapping, addr, end);
514
515 return 0;
516}
517#endif
518
519static void smaps_pte_entry(pte_t *pte, unsigned long addr,
520 struct mm_walk *walk)
521{
522 struct mem_size_stats *mss = walk->private;
523 struct vm_area_struct *vma = walk->vma;
524 struct page *page = NULL;
525
526 if (pte_present(*pte)) {
527 page = vm_normal_page(vma, addr, *pte);
528 } else if (is_swap_pte(*pte)) {
529 swp_entry_t swpent = pte_to_swp_entry(*pte);
530
531 if (!non_swap_entry(swpent)) {
532 int mapcount;
533
534 mss->swap += PAGE_SIZE;
535 mapcount = swp_swapcount(swpent);
536 if (mapcount >= 2) {
537 u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
538
539 do_div(pss_delta, mapcount);
540 mss->swap_pss += pss_delta;
541 } else {
542 mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
543 }
544 } else if (is_migration_entry(swpent))
545 page = migration_entry_to_page(swpent);
546 else if (is_device_private_entry(swpent))
547 page = device_private_entry_to_page(swpent);
548 } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap
549 && pte_none(*pte))) {
550 page = find_get_entry(vma->vm_file->f_mapping,
551 linear_page_index(vma, addr));
552 if (!page)
553 return;
554
555 if (radix_tree_exceptional_entry(page))
556 mss->swap += PAGE_SIZE;
557 else
558 put_page(page);
559
560 return;
561 }
562
563 if (!page)
564 return;
565
566 smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte));
567}
568
569#ifdef CONFIG_TRANSPARENT_HUGEPAGE
570static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
571 struct mm_walk *walk)
572{
573 struct mem_size_stats *mss = walk->private;
574 struct vm_area_struct *vma = walk->vma;
575 struct page *page;
576
577 /* FOLL_DUMP will return -EFAULT on huge zero page */
578 page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
579 if (IS_ERR_OR_NULL(page))
580 return;
581 if (PageAnon(page))
582 mss->anonymous_thp += HPAGE_PMD_SIZE;
583 else if (PageSwapBacked(page))
584 mss->shmem_thp += HPAGE_PMD_SIZE;
585 else if (is_zone_device_page(page))
586 /* pass */;
587 else
588 VM_BUG_ON_PAGE(1, page);
589 smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
590}
591#else
592static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
593 struct mm_walk *walk)
594{
595}
596#endif
597
598static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
599 struct mm_walk *walk)
600{
601 struct vm_area_struct *vma = walk->vma;
602 pte_t *pte;
603 spinlock_t *ptl;
604
605 ptl = pmd_trans_huge_lock(pmd, vma);
606 if (ptl) {
607 if (pmd_present(*pmd))
608 smaps_pmd_entry(pmd, addr, walk);
609 spin_unlock(ptl);
610 goto out;
611 }
612
613 if (pmd_trans_unstable(pmd))
614 goto out;
615 /*
616 * The mmap_sem held all the way back in m_start() is what
617 * keeps khugepaged out of here and from collapsing things
618 * in here.
619 */
620 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
621 for (; addr != end; pte++, addr += PAGE_SIZE)
622 smaps_pte_entry(pte, addr, walk);
623 pte_unmap_unlock(pte - 1, ptl);
624out:
625 cond_resched();
626 return 0;
627}
628
629static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
630{
631 /*
632 * Don't forget to update Documentation/ on changes.
633 */
634 static const char mnemonics[BITS_PER_LONG][2] = {
635 /*
636 * In case if we meet a flag we don't know about.
637 */
638 [0 ... (BITS_PER_LONG-1)] = "??",
639
640 [ilog2(VM_READ)] = "rd",
641 [ilog2(VM_WRITE)] = "wr",
642 [ilog2(VM_EXEC)] = "ex",
643 [ilog2(VM_SHARED)] = "sh",
644 [ilog2(VM_MAYREAD)] = "mr",
645 [ilog2(VM_MAYWRITE)] = "mw",
646 [ilog2(VM_MAYEXEC)] = "me",
647 [ilog2(VM_MAYSHARE)] = "ms",
648 [ilog2(VM_GROWSDOWN)] = "gd",
649 [ilog2(VM_PFNMAP)] = "pf",
650 [ilog2(VM_DENYWRITE)] = "dw",
651#ifdef CONFIG_X86_INTEL_MPX
652 [ilog2(VM_MPX)] = "mp",
653#endif
654 [ilog2(VM_LOCKED)] = "lo",
655 [ilog2(VM_IO)] = "io",
656 [ilog2(VM_SEQ_READ)] = "sr",
657 [ilog2(VM_RAND_READ)] = "rr",
658 [ilog2(VM_DONTCOPY)] = "dc",
659 [ilog2(VM_DONTEXPAND)] = "de",
660 [ilog2(VM_ACCOUNT)] = "ac",
661 [ilog2(VM_NORESERVE)] = "nr",
662 [ilog2(VM_HUGETLB)] = "ht",
663 [ilog2(VM_SYNC)] = "sf",
664 [ilog2(VM_ARCH_1)] = "ar",
665 [ilog2(VM_WIPEONFORK)] = "wf",
666 [ilog2(VM_DONTDUMP)] = "dd",
667#ifdef CONFIG_MEM_SOFT_DIRTY
668 [ilog2(VM_SOFTDIRTY)] = "sd",
669#endif
670 [ilog2(VM_MIXEDMAP)] = "mm",
671 [ilog2(VM_HUGEPAGE)] = "hg",
672 [ilog2(VM_NOHUGEPAGE)] = "nh",
673 [ilog2(VM_MERGEABLE)] = "mg",
674 [ilog2(VM_UFFD_MISSING)]= "um",
675 [ilog2(VM_UFFD_WP)] = "uw",
676#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
677 /* These come out via ProtectionKey: */
678 [ilog2(VM_PKEY_BIT0)] = "",
679 [ilog2(VM_PKEY_BIT1)] = "",
680 [ilog2(VM_PKEY_BIT2)] = "",
681 [ilog2(VM_PKEY_BIT3)] = "",
682#endif
683 };
684 size_t i;
685
686 seq_puts(m, "VmFlags: ");
687 for (i = 0; i < BITS_PER_LONG; i++) {
688 if (!mnemonics[i][0])
689 continue;
690 if (vma->vm_flags & (1UL << i)) {
691 seq_putc(m, mnemonics[i][0]);
692 seq_putc(m, mnemonics[i][1]);
693 seq_putc(m, ' ');
694 }
695 }
696 seq_putc(m, '\n');
697}
698
699#ifdef CONFIG_HUGETLB_PAGE
700static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
701 unsigned long addr, unsigned long end,
702 struct mm_walk *walk)
703{
704 struct mem_size_stats *mss = walk->private;
705 struct vm_area_struct *vma = walk->vma;
706 struct page *page = NULL;
707
708 if (pte_present(*pte)) {
709 page = vm_normal_page(vma, addr, *pte);
710 } else if (is_swap_pte(*pte)) {
711 swp_entry_t swpent = pte_to_swp_entry(*pte);
712
713 if (is_migration_entry(swpent))
714 page = migration_entry_to_page(swpent);
715 else if (is_device_private_entry(swpent))
716 page = device_private_entry_to_page(swpent);
717 }
718 if (page) {
719 int mapcount = page_mapcount(page);
720
721 if (mapcount >= 2)
722 mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
723 else
724 mss->private_hugetlb += huge_page_size(hstate_vma(vma));
725 }
726 return 0;
727}
728#endif /* HUGETLB_PAGE */
729
730void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
731{
732}
733
734#define SEQ_PUT_DEC(str, val) \
735 seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
736static int show_smap(struct seq_file *m, void *v, int is_pid)
737{
738 struct proc_maps_private *priv = m->private;
739 struct vm_area_struct *vma = v;
740 struct mem_size_stats mss_stack;
741 struct mem_size_stats *mss;
742 struct mm_walk smaps_walk = {
743 .pmd_entry = smaps_pte_range,
744#ifdef CONFIG_HUGETLB_PAGE
745 .hugetlb_entry = smaps_hugetlb_range,
746#endif
747 .mm = vma->vm_mm,
748 };
749 int ret = 0;
750 bool rollup_mode;
751 bool last_vma;
752
753 if (priv->rollup) {
754 rollup_mode = true;
755 mss = priv->rollup;
756 if (mss->first) {
757 mss->first_vma_start = vma->vm_start;
758 mss->first = false;
759 }
760 last_vma = !m_next_vma(priv, vma);
761 } else {
762 rollup_mode = false;
763 memset(&mss_stack, 0, sizeof(mss_stack));
764 mss = &mss_stack;
765 }
766
767 smaps_walk.private = mss;
768
769#ifdef CONFIG_SHMEM
770 if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) {
771 /*
772 * For shared or readonly shmem mappings we know that all
773 * swapped out pages belong to the shmem object, and we can
774 * obtain the swap value much more efficiently. For private
775 * writable mappings, we might have COW pages that are
776 * not affected by the parent swapped out pages of the shmem
777 * object, so we have to distinguish them during the page walk.
778 * Unless we know that the shmem object (or the part mapped by
779 * our VMA) has no swapped out pages at all.
780 */
781 unsigned long shmem_swapped = shmem_swap_usage(vma);
782
783 if (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
784 !(vma->vm_flags & VM_WRITE)) {
785 mss->swap = shmem_swapped;
786 } else {
787 mss->check_shmem_swap = true;
788 smaps_walk.pte_hole = smaps_pte_hole;
789 }
790 }
791#endif
792
793 /* mmap_sem is held in m_start */
794 walk_page_vma(vma, &smaps_walk);
795 if (vma->vm_flags & VM_LOCKED)
796 mss->pss_locked += mss->pss;
797
798 if (!rollup_mode) {
799 show_map_vma(m, vma, is_pid);
800 } else if (last_vma) {
801 show_vma_header_prefix(
802 m, mss->first_vma_start, vma->vm_end, 0, 0, 0, 0);
803 seq_pad(m, ' ');
804 seq_puts(m, "[rollup]\n");
805 } else {
806 ret = SEQ_SKIP;
807 }
808
809 if (!rollup_mode) {
810 SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start);
811 SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma));
812 SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma));
813 seq_puts(m, " kB\n");
814 }
815
816 if (!rollup_mode || last_vma) {
817 SEQ_PUT_DEC("Rss: ", mss->resident);
818 SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT);
819 SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean);
820 SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty);
821 SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean);
822 SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty);
823 SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced);
824 SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous);
825 SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree);
826 SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp);
827 SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp);
828 SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb);
829 seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ",
830 mss->private_hugetlb >> 10, 7);
831 SEQ_PUT_DEC(" kB\nSwap: ", mss->swap);
832 SEQ_PUT_DEC(" kB\nSwapPss: ",
833 mss->swap_pss >> PSS_SHIFT);
834 SEQ_PUT_DEC(" kB\nLocked: ", mss->pss >> PSS_SHIFT);
835 seq_puts(m, " kB\n");
836 }
837 if (!rollup_mode) {
838 arch_show_smap(m, vma);
839 show_smap_vma_flags(m, vma);
840 }
841 m_cache_vma(m, vma);
842 return ret;
843}
844#undef SEQ_PUT_DEC
845
846static int show_pid_smap(struct seq_file *m, void *v)
847{
848 return show_smap(m, v, 1);
849}
850
851static int show_tid_smap(struct seq_file *m, void *v)
852{
853 return show_smap(m, v, 0);
854}
855
856static const struct seq_operations proc_pid_smaps_op = {
857 .start = m_start,
858 .next = m_next,
859 .stop = m_stop,
860 .show = show_pid_smap
861};
862
863static const struct seq_operations proc_tid_smaps_op = {
864 .start = m_start,
865 .next = m_next,
866 .stop = m_stop,
867 .show = show_tid_smap
868};
869
870static int pid_smaps_open(struct inode *inode, struct file *file)
871{
872 return do_maps_open(inode, file, &proc_pid_smaps_op);
873}
874
875static int pid_smaps_rollup_open(struct inode *inode, struct file *file)
876{
877 struct seq_file *seq;
878 struct proc_maps_private *priv;
879 int ret = do_maps_open(inode, file, &proc_pid_smaps_op);
880
881 if (ret < 0)
882 return ret;
883 seq = file->private_data;
884 priv = seq->private;
885 priv->rollup = kzalloc(sizeof(*priv->rollup), GFP_KERNEL);
886 if (!priv->rollup) {
887 proc_map_release(inode, file);
888 return -ENOMEM;
889 }
890 priv->rollup->first = true;
891 return 0;
892}
893
894static int tid_smaps_open(struct inode *inode, struct file *file)
895{
896 return do_maps_open(inode, file, &proc_tid_smaps_op);
897}
898
899const struct file_operations proc_pid_smaps_operations = {
900 .open = pid_smaps_open,
901 .read = seq_read,
902 .llseek = seq_lseek,
903 .release = proc_map_release,
904};
905
906const struct file_operations proc_pid_smaps_rollup_operations = {
907 .open = pid_smaps_rollup_open,
908 .read = seq_read,
909 .llseek = seq_lseek,
910 .release = proc_map_release,
911};
912
913const struct file_operations proc_tid_smaps_operations = {
914 .open = tid_smaps_open,
915 .read = seq_read,
916 .llseek = seq_lseek,
917 .release = proc_map_release,
918};
919
920enum clear_refs_types {
921 CLEAR_REFS_ALL = 1,
922 CLEAR_REFS_ANON,
923 CLEAR_REFS_MAPPED,
924 CLEAR_REFS_SOFT_DIRTY,
925 CLEAR_REFS_MM_HIWATER_RSS,
926 CLEAR_REFS_LAST,
927};
928
929struct clear_refs_private {
930 enum clear_refs_types type;
931};
932
933#ifdef CONFIG_MEM_SOFT_DIRTY
934static inline void clear_soft_dirty(struct vm_area_struct *vma,
935 unsigned long addr, pte_t *pte)
936{
937 /*
938 * The soft-dirty tracker uses #PF-s to catch writes
939 * to pages, so write-protect the pte as well. See the
940 * Documentation/vm/soft-dirty.txt for full description
941 * of how soft-dirty works.
942 */
943 pte_t ptent = *pte;
944
945 if (pte_present(ptent)) {
946 ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
947 ptent = pte_wrprotect(ptent);
948 ptent = pte_clear_soft_dirty(ptent);
949 ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
950 } else if (is_swap_pte(ptent)) {
951 ptent = pte_swp_clear_soft_dirty(ptent);
952 set_pte_at(vma->vm_mm, addr, pte, ptent);
953 }
954}
955#else
956static inline void clear_soft_dirty(struct vm_area_struct *vma,
957 unsigned long addr, pte_t *pte)
958{
959}
960#endif
961
962#if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
963static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
964 unsigned long addr, pmd_t *pmdp)
965{
966 pmd_t old, pmd = *pmdp;
967
968 if (pmd_present(pmd)) {
969 /* See comment in change_huge_pmd() */
970 old = pmdp_invalidate(vma, addr, pmdp);
971 if (pmd_dirty(old))
972 pmd = pmd_mkdirty(pmd);
973 if (pmd_young(old))
974 pmd = pmd_mkyoung(pmd);
975
976 pmd = pmd_wrprotect(pmd);
977 pmd = pmd_clear_soft_dirty(pmd);
978
979 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
980 } else if (is_migration_entry(pmd_to_swp_entry(pmd))) {
981 pmd = pmd_swp_clear_soft_dirty(pmd);
982 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
983 }
984}
985#else
986static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
987 unsigned long addr, pmd_t *pmdp)
988{
989}
990#endif
991
992static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
993 unsigned long end, struct mm_walk *walk)
994{
995 struct clear_refs_private *cp = walk->private;
996 struct vm_area_struct *vma = walk->vma;
997 pte_t *pte, ptent;
998 spinlock_t *ptl;
999 struct page *page;
1000
1001 ptl = pmd_trans_huge_lock(pmd, vma);
1002 if (ptl) {
1003 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
1004 clear_soft_dirty_pmd(vma, addr, pmd);
1005 goto out;
1006 }
1007
1008 if (!pmd_present(*pmd))
1009 goto out;
1010
1011 page = pmd_page(*pmd);
1012
1013 /* Clear accessed and referenced bits. */
1014 pmdp_test_and_clear_young(vma, addr, pmd);
1015 test_and_clear_page_young(page);
1016 ClearPageReferenced(page);
1017out:
1018 spin_unlock(ptl);
1019 return 0;
1020 }
1021
1022 if (pmd_trans_unstable(pmd))
1023 return 0;
1024
1025 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
1026 for (; addr != end; pte++, addr += PAGE_SIZE) {
1027 ptent = *pte;
1028
1029 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
1030 clear_soft_dirty(vma, addr, pte);
1031 continue;
1032 }
1033
1034 if (!pte_present(ptent))
1035 continue;
1036
1037 page = vm_normal_page(vma, addr, ptent);
1038 if (!page)
1039 continue;
1040
1041 /* Clear accessed and referenced bits. */
1042 ptep_test_and_clear_young(vma, addr, pte);
1043 test_and_clear_page_young(page);
1044 ClearPageReferenced(page);
1045 }
1046 pte_unmap_unlock(pte - 1, ptl);
1047 cond_resched();
1048 return 0;
1049}
1050
1051static int clear_refs_test_walk(unsigned long start, unsigned long end,
1052 struct mm_walk *walk)
1053{
1054 struct clear_refs_private *cp = walk->private;
1055 struct vm_area_struct *vma = walk->vma;
1056
1057 if (vma->vm_flags & VM_PFNMAP)
1058 return 1;
1059
1060 /*
1061 * Writing 1 to /proc/pid/clear_refs affects all pages.
1062 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
1063 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
1064 * Writing 4 to /proc/pid/clear_refs affects all pages.
1065 */
1066 if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
1067 return 1;
1068 if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
1069 return 1;
1070 return 0;
1071}
1072
1073static ssize_t clear_refs_write(struct file *file, const char __user *buf,
1074 size_t count, loff_t *ppos)
1075{
1076 struct task_struct *task;
1077 char buffer[PROC_NUMBUF];
1078 struct mm_struct *mm;
1079 struct vm_area_struct *vma;
1080 enum clear_refs_types type;
1081 struct mmu_gather tlb;
1082 int itype;
1083 int rv;
1084
1085 memset(buffer, 0, sizeof(buffer));
1086 if (count > sizeof(buffer) - 1)
1087 count = sizeof(buffer) - 1;
1088 if (copy_from_user(buffer, buf, count))
1089 return -EFAULT;
1090 rv = kstrtoint(strstrip(buffer), 10, &itype);
1091 if (rv < 0)
1092 return rv;
1093 type = (enum clear_refs_types)itype;
1094 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
1095 return -EINVAL;
1096
1097 task = get_proc_task(file_inode(file));
1098 if (!task)
1099 return -ESRCH;
1100 mm = get_task_mm(task);
1101 if (mm) {
1102 struct clear_refs_private cp = {
1103 .type = type,
1104 };
1105 struct mm_walk clear_refs_walk = {
1106 .pmd_entry = clear_refs_pte_range,
1107 .test_walk = clear_refs_test_walk,
1108 .mm = mm,
1109 .private = &cp,
1110 };
1111
1112 if (type == CLEAR_REFS_MM_HIWATER_RSS) {
1113 if (down_write_killable(&mm->mmap_sem)) {
1114 count = -EINTR;
1115 goto out_mm;
1116 }
1117
1118 /*
1119 * Writing 5 to /proc/pid/clear_refs resets the peak
1120 * resident set size to this mm's current rss value.
1121 */
1122 reset_mm_hiwater_rss(mm);
1123 up_write(&mm->mmap_sem);
1124 goto out_mm;
1125 }
1126
1127 down_read(&mm->mmap_sem);
1128 tlb_gather_mmu(&tlb, mm, 0, -1);
1129 if (type == CLEAR_REFS_SOFT_DIRTY) {
1130 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1131 if (!(vma->vm_flags & VM_SOFTDIRTY))
1132 continue;
1133 up_read(&mm->mmap_sem);
1134 if (down_write_killable(&mm->mmap_sem)) {
1135 count = -EINTR;
1136 goto out_mm;
1137 }
1138 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1139 vma->vm_flags &= ~VM_SOFTDIRTY;
1140 vma_set_page_prot(vma);
1141 }
1142 downgrade_write(&mm->mmap_sem);
1143 break;
1144 }
1145 mmu_notifier_invalidate_range_start(mm, 0, -1);
1146 }
1147 walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
1148 if (type == CLEAR_REFS_SOFT_DIRTY)
1149 mmu_notifier_invalidate_range_end(mm, 0, -1);
1150 tlb_finish_mmu(&tlb, 0, -1);
1151 up_read(&mm->mmap_sem);
1152out_mm:
1153 mmput(mm);
1154 }
1155 put_task_struct(task);
1156
1157 return count;
1158}
1159
1160const struct file_operations proc_clear_refs_operations = {
1161 .write = clear_refs_write,
1162 .llseek = noop_llseek,
1163};
1164
1165typedef struct {
1166 u64 pme;
1167} pagemap_entry_t;
1168
1169struct pagemapread {
1170 int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
1171 pagemap_entry_t *buffer;
1172 bool show_pfn;
1173};
1174
1175#define PAGEMAP_WALK_SIZE (PMD_SIZE)
1176#define PAGEMAP_WALK_MASK (PMD_MASK)
1177
1178#define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1179#define PM_PFRAME_BITS 55
1180#define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1181#define PM_SOFT_DIRTY BIT_ULL(55)
1182#define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1183#define PM_FILE BIT_ULL(61)
1184#define PM_SWAP BIT_ULL(62)
1185#define PM_PRESENT BIT_ULL(63)
1186
1187#define PM_END_OF_BUFFER 1
1188
1189static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
1190{
1191 return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags };
1192}
1193
1194static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
1195 struct pagemapread *pm)
1196{
1197 pm->buffer[pm->pos++] = *pme;
1198 if (pm->pos >= pm->len)
1199 return PM_END_OF_BUFFER;
1200 return 0;
1201}
1202
1203static int pagemap_pte_hole(unsigned long start, unsigned long end,
1204 struct mm_walk *walk)
1205{
1206 struct pagemapread *pm = walk->private;
1207 unsigned long addr = start;
1208 int err = 0;
1209
1210 while (addr < end) {
1211 struct vm_area_struct *vma = find_vma(walk->mm, addr);
1212 pagemap_entry_t pme = make_pme(0, 0);
1213 /* End of address space hole, which we mark as non-present. */
1214 unsigned long hole_end;
1215
1216 if (vma)
1217 hole_end = min(end, vma->vm_start);
1218 else
1219 hole_end = end;
1220
1221 for (; addr < hole_end; addr += PAGE_SIZE) {
1222 err = add_to_pagemap(addr, &pme, pm);
1223 if (err)
1224 goto out;
1225 }
1226
1227 if (!vma)
1228 break;
1229
1230 /* Addresses in the VMA. */
1231 if (vma->vm_flags & VM_SOFTDIRTY)
1232 pme = make_pme(0, PM_SOFT_DIRTY);
1233 for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
1234 err = add_to_pagemap(addr, &pme, pm);
1235 if (err)
1236 goto out;
1237 }
1238 }
1239out:
1240 return err;
1241}
1242
1243static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
1244 struct vm_area_struct *vma, unsigned long addr, pte_t pte)
1245{
1246 u64 frame = 0, flags = 0;
1247 struct page *page = NULL;
1248
1249 if (pte_present(pte)) {
1250 if (pm->show_pfn)
1251 frame = pte_pfn(pte);
1252 flags |= PM_PRESENT;
1253 page = _vm_normal_page(vma, addr, pte, true);
1254 if (pte_soft_dirty(pte))
1255 flags |= PM_SOFT_DIRTY;
1256 } else if (is_swap_pte(pte)) {
1257 swp_entry_t entry;
1258 if (pte_swp_soft_dirty(pte))
1259 flags |= PM_SOFT_DIRTY;
1260 entry = pte_to_swp_entry(pte);
1261 frame = swp_type(entry) |
1262 (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
1263 flags |= PM_SWAP;
1264 if (is_migration_entry(entry))
1265 page = migration_entry_to_page(entry);
1266
1267 if (is_device_private_entry(entry))
1268 page = device_private_entry_to_page(entry);
1269 }
1270
1271 if (page && !PageAnon(page))
1272 flags |= PM_FILE;
1273 if (page && page_mapcount(page) == 1)
1274 flags |= PM_MMAP_EXCLUSIVE;
1275 if (vma->vm_flags & VM_SOFTDIRTY)
1276 flags |= PM_SOFT_DIRTY;
1277
1278 return make_pme(frame, flags);
1279}
1280
1281static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
1282 struct mm_walk *walk)
1283{
1284 struct vm_area_struct *vma = walk->vma;
1285 struct pagemapread *pm = walk->private;
1286 spinlock_t *ptl;
1287 pte_t *pte, *orig_pte;
1288 int err = 0;
1289
1290#ifdef CONFIG_TRANSPARENT_HUGEPAGE
1291 ptl = pmd_trans_huge_lock(pmdp, vma);
1292 if (ptl) {
1293 u64 flags = 0, frame = 0;
1294 pmd_t pmd = *pmdp;
1295 struct page *page = NULL;
1296
1297 if (vma->vm_flags & VM_SOFTDIRTY)
1298 flags |= PM_SOFT_DIRTY;
1299
1300 if (pmd_present(pmd)) {
1301 page = pmd_page(pmd);
1302
1303 flags |= PM_PRESENT;
1304 if (pmd_soft_dirty(pmd))
1305 flags |= PM_SOFT_DIRTY;
1306 if (pm->show_pfn)
1307 frame = pmd_pfn(pmd) +
1308 ((addr & ~PMD_MASK) >> PAGE_SHIFT);
1309 }
1310#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1311 else if (is_swap_pmd(pmd)) {
1312 swp_entry_t entry = pmd_to_swp_entry(pmd);
1313 unsigned long offset = swp_offset(entry);
1314
1315 offset += (addr & ~PMD_MASK) >> PAGE_SHIFT;
1316 frame = swp_type(entry) |
1317 (offset << MAX_SWAPFILES_SHIFT);
1318 flags |= PM_SWAP;
1319 if (pmd_swp_soft_dirty(pmd))
1320 flags |= PM_SOFT_DIRTY;
1321 VM_BUG_ON(!is_pmd_migration_entry(pmd));
1322 page = migration_entry_to_page(entry);
1323 }
1324#endif
1325
1326 if (page && page_mapcount(page) == 1)
1327 flags |= PM_MMAP_EXCLUSIVE;
1328
1329 for (; addr != end; addr += PAGE_SIZE) {
1330 pagemap_entry_t pme = make_pme(frame, flags);
1331
1332 err = add_to_pagemap(addr, &pme, pm);
1333 if (err)
1334 break;
1335 if (pm->show_pfn && (flags & PM_PRESENT))
1336 frame++;
1337 else if (flags & PM_SWAP)
1338 frame += (1 << MAX_SWAPFILES_SHIFT);
1339 }
1340 spin_unlock(ptl);
1341 return err;
1342 }
1343
1344 if (pmd_trans_unstable(pmdp))
1345 return 0;
1346#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1347
1348 /*
1349 * We can assume that @vma always points to a valid one and @end never
1350 * goes beyond vma->vm_end.
1351 */
1352 orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
1353 for (; addr < end; pte++, addr += PAGE_SIZE) {
1354 pagemap_entry_t pme;
1355
1356 pme = pte_to_pagemap_entry(pm, vma, addr, *pte);
1357 err = add_to_pagemap(addr, &pme, pm);
1358 if (err)
1359 break;
1360 }
1361 pte_unmap_unlock(orig_pte, ptl);
1362
1363 cond_resched();
1364
1365 return err;
1366}
1367
1368#ifdef CONFIG_HUGETLB_PAGE
1369/* This function walks within one hugetlb entry in the single call */
1370static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
1371 unsigned long addr, unsigned long end,
1372 struct mm_walk *walk)
1373{
1374 struct pagemapread *pm = walk->private;
1375 struct vm_area_struct *vma = walk->vma;
1376 u64 flags = 0, frame = 0;
1377 int err = 0;
1378 pte_t pte;
1379
1380 if (vma->vm_flags & VM_SOFTDIRTY)
1381 flags |= PM_SOFT_DIRTY;
1382
1383 pte = huge_ptep_get(ptep);
1384 if (pte_present(pte)) {
1385 struct page *page = pte_page(pte);
1386
1387 if (!PageAnon(page))
1388 flags |= PM_FILE;
1389
1390 if (page_mapcount(page) == 1)
1391 flags |= PM_MMAP_EXCLUSIVE;
1392
1393 flags |= PM_PRESENT;
1394 if (pm->show_pfn)
1395 frame = pte_pfn(pte) +
1396 ((addr & ~hmask) >> PAGE_SHIFT);
1397 }
1398
1399 for (; addr != end; addr += PAGE_SIZE) {
1400 pagemap_entry_t pme = make_pme(frame, flags);
1401
1402 err = add_to_pagemap(addr, &pme, pm);
1403 if (err)
1404 return err;
1405 if (pm->show_pfn && (flags & PM_PRESENT))
1406 frame++;
1407 }
1408
1409 cond_resched();
1410
1411 return err;
1412}
1413#endif /* HUGETLB_PAGE */
1414
1415/*
1416 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1417 *
1418 * For each page in the address space, this file contains one 64-bit entry
1419 * consisting of the following:
1420 *
1421 * Bits 0-54 page frame number (PFN) if present
1422 * Bits 0-4 swap type if swapped
1423 * Bits 5-54 swap offset if swapped
1424 * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt)
1425 * Bit 56 page exclusively mapped
1426 * Bits 57-60 zero
1427 * Bit 61 page is file-page or shared-anon
1428 * Bit 62 page swapped
1429 * Bit 63 page present
1430 *
1431 * If the page is not present but in swap, then the PFN contains an
1432 * encoding of the swap file number and the page's offset into the
1433 * swap. Unmapped pages return a null PFN. This allows determining
1434 * precisely which pages are mapped (or in swap) and comparing mapped
1435 * pages between processes.
1436 *
1437 * Efficient users of this interface will use /proc/pid/maps to
1438 * determine which areas of memory are actually mapped and llseek to
1439 * skip over unmapped regions.
1440 */
1441static ssize_t pagemap_read(struct file *file, char __user *buf,
1442 size_t count, loff_t *ppos)
1443{
1444 struct mm_struct *mm = file->private_data;
1445 struct pagemapread pm;
1446 struct mm_walk pagemap_walk = {};
1447 unsigned long src;
1448 unsigned long svpfn;
1449 unsigned long start_vaddr;
1450 unsigned long end_vaddr;
1451 int ret = 0, copied = 0;
1452
1453 if (!mm || !mmget_not_zero(mm))
1454 goto out;
1455
1456 ret = -EINVAL;
1457 /* file position must be aligned */
1458 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
1459 goto out_mm;
1460
1461 ret = 0;
1462 if (!count)
1463 goto out_mm;
1464
1465 /* do not disclose physical addresses: attack vector */
1466 pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
1467
1468 pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
1469 pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_KERNEL);
1470 ret = -ENOMEM;
1471 if (!pm.buffer)
1472 goto out_mm;
1473
1474 pagemap_walk.pmd_entry = pagemap_pmd_range;
1475 pagemap_walk.pte_hole = pagemap_pte_hole;
1476#ifdef CONFIG_HUGETLB_PAGE
1477 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
1478#endif
1479 pagemap_walk.mm = mm;
1480 pagemap_walk.private = ±
1481
1482 src = *ppos;
1483 svpfn = src / PM_ENTRY_BYTES;
1484 start_vaddr = svpfn << PAGE_SHIFT;
1485 end_vaddr = mm->task_size;
1486
1487 /* watch out for wraparound */
1488 if (svpfn > mm->task_size >> PAGE_SHIFT)
1489 start_vaddr = end_vaddr;
1490
1491 /*
1492 * The odds are that this will stop walking way
1493 * before end_vaddr, because the length of the
1494 * user buffer is tracked in "pm", and the walk
1495 * will stop when we hit the end of the buffer.
1496 */
1497 ret = 0;
1498 while (count && (start_vaddr < end_vaddr)) {
1499 int len;
1500 unsigned long end;
1501
1502 pm.pos = 0;
1503 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
1504 /* overflow ? */
1505 if (end < start_vaddr || end > end_vaddr)
1506 end = end_vaddr;
1507 down_read(&mm->mmap_sem);
1508 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
1509 up_read(&mm->mmap_sem);
1510 start_vaddr = end;
1511
1512 len = min(count, PM_ENTRY_BYTES * pm.pos);
1513 if (copy_to_user(buf, pm.buffer, len)) {
1514 ret = -EFAULT;
1515 goto out_free;
1516 }
1517 copied += len;
1518 buf += len;
1519 count -= len;
1520 }
1521 *ppos += copied;
1522 if (!ret || ret == PM_END_OF_BUFFER)
1523 ret = copied;
1524
1525out_free:
1526 kfree(pm.buffer);
1527out_mm:
1528 mmput(mm);
1529out:
1530 return ret;
1531}
1532
1533static int pagemap_open(struct inode *inode, struct file *file)
1534{
1535 struct mm_struct *mm;
1536
1537 mm = proc_mem_open(inode, PTRACE_MODE_READ);
1538 if (IS_ERR(mm))
1539 return PTR_ERR(mm);
1540 file->private_data = mm;
1541 return 0;
1542}
1543
1544static int pagemap_release(struct inode *inode, struct file *file)
1545{
1546 struct mm_struct *mm = file->private_data;
1547
1548 if (mm)
1549 mmdrop(mm);
1550 return 0;
1551}
1552
1553const struct file_operations proc_pagemap_operations = {
1554 .llseek = mem_lseek, /* borrow this */
1555 .read = pagemap_read,
1556 .open = pagemap_open,
1557 .release = pagemap_release,
1558};
1559#endif /* CONFIG_PROC_PAGE_MONITOR */
1560
1561#ifdef CONFIG_NUMA
1562
1563struct numa_maps {
1564 unsigned long pages;
1565 unsigned long anon;
1566 unsigned long active;
1567 unsigned long writeback;
1568 unsigned long mapcount_max;
1569 unsigned long dirty;
1570 unsigned long swapcache;
1571 unsigned long node[MAX_NUMNODES];
1572};
1573
1574struct numa_maps_private {
1575 struct proc_maps_private proc_maps;
1576 struct numa_maps md;
1577};
1578
1579static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1580 unsigned long nr_pages)
1581{
1582 int count = page_mapcount(page);
1583
1584 md->pages += nr_pages;
1585 if (pte_dirty || PageDirty(page))
1586 md->dirty += nr_pages;
1587
1588 if (PageSwapCache(page))
1589 md->swapcache += nr_pages;
1590
1591 if (PageActive(page) || PageUnevictable(page))
1592 md->active += nr_pages;
1593
1594 if (PageWriteback(page))
1595 md->writeback += nr_pages;
1596
1597 if (PageAnon(page))
1598 md->anon += nr_pages;
1599
1600 if (count > md->mapcount_max)
1601 md->mapcount_max = count;
1602
1603 md->node[page_to_nid(page)] += nr_pages;
1604}
1605
1606static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1607 unsigned long addr)
1608{
1609 struct page *page;
1610 int nid;
1611
1612 if (!pte_present(pte))
1613 return NULL;
1614
1615 page = vm_normal_page(vma, addr, pte);
1616 if (!page)
1617 return NULL;
1618
1619 if (PageReserved(page))
1620 return NULL;
1621
1622 nid = page_to_nid(page);
1623 if (!node_isset(nid, node_states[N_MEMORY]))
1624 return NULL;
1625
1626 return page;
1627}
1628
1629#ifdef CONFIG_TRANSPARENT_HUGEPAGE
1630static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
1631 struct vm_area_struct *vma,
1632 unsigned long addr)
1633{
1634 struct page *page;
1635 int nid;
1636
1637 if (!pmd_present(pmd))
1638 return NULL;
1639
1640 page = vm_normal_page_pmd(vma, addr, pmd);
1641 if (!page)
1642 return NULL;
1643
1644 if (PageReserved(page))
1645 return NULL;
1646
1647 nid = page_to_nid(page);
1648 if (!node_isset(nid, node_states[N_MEMORY]))
1649 return NULL;
1650
1651 return page;
1652}
1653#endif
1654
1655static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1656 unsigned long end, struct mm_walk *walk)
1657{
1658 struct numa_maps *md = walk->private;
1659 struct vm_area_struct *vma = walk->vma;
1660 spinlock_t *ptl;
1661 pte_t *orig_pte;
1662 pte_t *pte;
1663
1664#ifdef CONFIG_TRANSPARENT_HUGEPAGE
1665 ptl = pmd_trans_huge_lock(pmd, vma);
1666 if (ptl) {
1667 struct page *page;
1668
1669 page = can_gather_numa_stats_pmd(*pmd, vma, addr);
1670 if (page)
1671 gather_stats(page, md, pmd_dirty(*pmd),
1672 HPAGE_PMD_SIZE/PAGE_SIZE);
1673 spin_unlock(ptl);
1674 return 0;
1675 }
1676
1677 if (pmd_trans_unstable(pmd))
1678 return 0;
1679#endif
1680 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1681 do {
1682 struct page *page = can_gather_numa_stats(*pte, vma, addr);
1683 if (!page)
1684 continue;
1685 gather_stats(page, md, pte_dirty(*pte), 1);
1686
1687 } while (pte++, addr += PAGE_SIZE, addr != end);
1688 pte_unmap_unlock(orig_pte, ptl);
1689 cond_resched();
1690 return 0;
1691}
1692#ifdef CONFIG_HUGETLB_PAGE
1693static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1694 unsigned long addr, unsigned long end, struct mm_walk *walk)
1695{
1696 pte_t huge_pte = huge_ptep_get(pte);
1697 struct numa_maps *md;
1698 struct page *page;
1699
1700 if (!pte_present(huge_pte))
1701 return 0;
1702
1703 page = pte_page(huge_pte);
1704 if (!page)
1705 return 0;
1706
1707 md = walk->private;
1708 gather_stats(page, md, pte_dirty(huge_pte), 1);
1709 return 0;
1710}
1711
1712#else
1713static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1714 unsigned long addr, unsigned long end, struct mm_walk *walk)
1715{
1716 return 0;
1717}
1718#endif
1719
1720/*
1721 * Display pages allocated per node and memory policy via /proc.
1722 */
1723static int show_numa_map(struct seq_file *m, void *v, int is_pid)
1724{
1725 struct numa_maps_private *numa_priv = m->private;
1726 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
1727 struct vm_area_struct *vma = v;
1728 struct numa_maps *md = &numa_priv->md;
1729 struct file *file = vma->vm_file;
1730 struct mm_struct *mm = vma->vm_mm;
1731 struct mm_walk walk = {
1732 .hugetlb_entry = gather_hugetlb_stats,
1733 .pmd_entry = gather_pte_stats,
1734 .private = md,
1735 .mm = mm,
1736 };
1737 struct mempolicy *pol;
1738 char buffer[64];
1739 int nid;
1740
1741 if (!mm)
1742 return 0;
1743
1744 /* Ensure we start with an empty set of numa_maps statistics. */
1745 memset(md, 0, sizeof(*md));
1746
1747 pol = __get_vma_policy(vma, vma->vm_start);
1748 if (pol) {
1749 mpol_to_str(buffer, sizeof(buffer), pol);
1750 mpol_cond_put(pol);
1751 } else {
1752 mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy);
1753 }
1754
1755 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1756
1757 if (file) {
1758 seq_puts(m, " file=");
1759 seq_file_path(m, file, "\n\t= ");
1760 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1761 seq_puts(m, " heap");
1762 } else if (is_stack(vma)) {
1763 seq_puts(m, " stack");
1764 }
1765
1766 if (is_vm_hugetlb_page(vma))
1767 seq_puts(m, " huge");
1768
1769 /* mmap_sem is held by m_start */
1770 walk_page_vma(vma, &walk);
1771
1772 if (!md->pages)
1773 goto out;
1774
1775 if (md->anon)
1776 seq_printf(m, " anon=%lu", md->anon);
1777
1778 if (md->dirty)
1779 seq_printf(m, " dirty=%lu", md->dirty);
1780
1781 if (md->pages != md->anon && md->pages != md->dirty)
1782 seq_printf(m, " mapped=%lu", md->pages);
1783
1784 if (md->mapcount_max > 1)
1785 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1786
1787 if (md->swapcache)
1788 seq_printf(m, " swapcache=%lu", md->swapcache);
1789
1790 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1791 seq_printf(m, " active=%lu", md->active);
1792
1793 if (md->writeback)
1794 seq_printf(m, " writeback=%lu", md->writeback);
1795
1796 for_each_node_state(nid, N_MEMORY)
1797 if (md->node[nid])
1798 seq_printf(m, " N%d=%lu", nid, md->node[nid]);
1799
1800 seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
1801out:
1802 seq_putc(m, '\n');
1803 m_cache_vma(m, vma);
1804 return 0;
1805}
1806
1807static int show_pid_numa_map(struct seq_file *m, void *v)
1808{
1809 return show_numa_map(m, v, 1);
1810}
1811
1812static int show_tid_numa_map(struct seq_file *m, void *v)
1813{
1814 return show_numa_map(m, v, 0);
1815}
1816
1817static const struct seq_operations proc_pid_numa_maps_op = {
1818 .start = m_start,
1819 .next = m_next,
1820 .stop = m_stop,
1821 .show = show_pid_numa_map,
1822};
1823
1824static const struct seq_operations proc_tid_numa_maps_op = {
1825 .start = m_start,
1826 .next = m_next,
1827 .stop = m_stop,
1828 .show = show_tid_numa_map,
1829};
1830
1831static int numa_maps_open(struct inode *inode, struct file *file,
1832 const struct seq_operations *ops)
1833{
1834 return proc_maps_open(inode, file, ops,
1835 sizeof(struct numa_maps_private));
1836}
1837
1838static int pid_numa_maps_open(struct inode *inode, struct file *file)
1839{
1840 return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
1841}
1842
1843static int tid_numa_maps_open(struct inode *inode, struct file *file)
1844{
1845 return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
1846}
1847
1848const struct file_operations proc_pid_numa_maps_operations = {
1849 .open = pid_numa_maps_open,
1850 .read = seq_read,
1851 .llseek = seq_lseek,
1852 .release = proc_map_release,
1853};
1854
1855const struct file_operations proc_tid_numa_maps_operations = {
1856 .open = tid_numa_maps_open,
1857 .read = seq_read,
1858 .llseek = seq_lseek,
1859 .release = proc_map_release,
1860};
1861#endif /* CONFIG_NUMA */