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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#include <linux/mm.h>
2#include <linux/vmacache.h>
3#include <linux/hugetlb.h>
4#include <linux/huge_mm.h>
5#include <linux/mount.h>
6#include <linux/seq_file.h>
7#include <linux/highmem.h>
8#include <linux/ptrace.h>
9#include <linux/slab.h>
10#include <linux/pagemap.h>
11#include <linux/mempolicy.h>
12#include <linux/rmap.h>
13#include <linux/swap.h>
14#include <linux/swapops.h>
15#include <linux/mmu_notifier.h>
16
17#include <asm/elf.h>
18#include <asm/uaccess.h>
19#include <asm/tlbflush.h>
20#include "internal.h"
21
22void task_mem(struct seq_file *m, struct mm_struct *mm)
23{
24 unsigned long data, text, lib, swap;
25 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
26
27 /*
28 * Note: to minimize their overhead, mm maintains hiwater_vm and
29 * hiwater_rss only when about to *lower* total_vm or rss. Any
30 * collector of these hiwater stats must therefore get total_vm
31 * and rss too, which will usually be the higher. Barriers? not
32 * worth the effort, such snapshots can always be inconsistent.
33 */
34 hiwater_vm = total_vm = mm->total_vm;
35 if (hiwater_vm < mm->hiwater_vm)
36 hiwater_vm = mm->hiwater_vm;
37 hiwater_rss = total_rss = get_mm_rss(mm);
38 if (hiwater_rss < mm->hiwater_rss)
39 hiwater_rss = mm->hiwater_rss;
40
41 data = mm->total_vm - mm->shared_vm - mm->stack_vm;
42 text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
43 lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
44 swap = get_mm_counter(mm, MM_SWAPENTS);
45 seq_printf(m,
46 "VmPeak:\t%8lu kB\n"
47 "VmSize:\t%8lu kB\n"
48 "VmLck:\t%8lu kB\n"
49 "VmPin:\t%8lu kB\n"
50 "VmHWM:\t%8lu kB\n"
51 "VmRSS:\t%8lu kB\n"
52 "VmData:\t%8lu kB\n"
53 "VmStk:\t%8lu kB\n"
54 "VmExe:\t%8lu kB\n"
55 "VmLib:\t%8lu kB\n"
56 "VmPTE:\t%8lu kB\n"
57 "VmSwap:\t%8lu kB\n",
58 hiwater_vm << (PAGE_SHIFT-10),
59 total_vm << (PAGE_SHIFT-10),
60 mm->locked_vm << (PAGE_SHIFT-10),
61 mm->pinned_vm << (PAGE_SHIFT-10),
62 hiwater_rss << (PAGE_SHIFT-10),
63 total_rss << (PAGE_SHIFT-10),
64 data << (PAGE_SHIFT-10),
65 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
66 (PTRS_PER_PTE * sizeof(pte_t) *
67 atomic_long_read(&mm->nr_ptes)) >> 10,
68 swap << (PAGE_SHIFT-10));
69}
70
71unsigned long task_vsize(struct mm_struct *mm)
72{
73 return PAGE_SIZE * mm->total_vm;
74}
75
76unsigned long task_statm(struct mm_struct *mm,
77 unsigned long *shared, unsigned long *text,
78 unsigned long *data, unsigned long *resident)
79{
80 *shared = get_mm_counter(mm, MM_FILEPAGES);
81 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
82 >> PAGE_SHIFT;
83 *data = mm->total_vm - mm->shared_vm;
84 *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
85 return mm->total_vm;
86}
87
88#ifdef CONFIG_NUMA
89/*
90 * These functions are for numa_maps but called in generic **maps seq_file
91 * ->start(), ->stop() ops.
92 *
93 * numa_maps scans all vmas under mmap_sem and checks their mempolicy.
94 * Each mempolicy object is controlled by reference counting. The problem here
95 * is how to avoid accessing dead mempolicy object.
96 *
97 * Because we're holding mmap_sem while reading seq_file, it's safe to access
98 * each vma's mempolicy, no vma objects will never drop refs to mempolicy.
99 *
100 * A task's mempolicy (task->mempolicy) has different behavior. task->mempolicy
101 * is set and replaced under mmap_sem but unrefed and cleared under task_lock().
102 * So, without task_lock(), we cannot trust get_vma_policy() because we cannot
103 * gurantee the task never exits under us. But taking task_lock() around
104 * get_vma_plicy() causes lock order problem.
105 *
106 * To access task->mempolicy without lock, we hold a reference count of an
107 * object pointed by task->mempolicy and remember it. This will guarantee
108 * that task->mempolicy points to an alive object or NULL in numa_maps accesses.
109 */
110static void hold_task_mempolicy(struct proc_maps_private *priv)
111{
112 struct task_struct *task = priv->task;
113
114 task_lock(task);
115 priv->task_mempolicy = task->mempolicy;
116 mpol_get(priv->task_mempolicy);
117 task_unlock(task);
118}
119static void release_task_mempolicy(struct proc_maps_private *priv)
120{
121 mpol_put(priv->task_mempolicy);
122}
123#else
124static void hold_task_mempolicy(struct proc_maps_private *priv)
125{
126}
127static void release_task_mempolicy(struct proc_maps_private *priv)
128{
129}
130#endif
131
132static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)
133{
134 if (vma && vma != priv->tail_vma) {
135 struct mm_struct *mm = vma->vm_mm;
136 release_task_mempolicy(priv);
137 up_read(&mm->mmap_sem);
138 mmput(mm);
139 }
140}
141
142static void *m_start(struct seq_file *m, loff_t *pos)
143{
144 struct proc_maps_private *priv = m->private;
145 unsigned long last_addr = m->version;
146 struct mm_struct *mm;
147 struct vm_area_struct *vma, *tail_vma = NULL;
148 loff_t l = *pos;
149
150 /* Clear the per syscall fields in priv */
151 priv->task = NULL;
152 priv->tail_vma = NULL;
153
154 /*
155 * We remember last_addr rather than next_addr to hit with
156 * vmacache most of the time. We have zero last_addr at
157 * the beginning and also after lseek. We will have -1 last_addr
158 * after the end of the vmas.
159 */
160
161 if (last_addr == -1UL)
162 return NULL;
163
164 priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
165 if (!priv->task)
166 return ERR_PTR(-ESRCH);
167
168 mm = mm_access(priv->task, PTRACE_MODE_READ);
169 if (!mm || IS_ERR(mm))
170 return mm;
171 down_read(&mm->mmap_sem);
172
173 tail_vma = get_gate_vma(priv->task->mm);
174 priv->tail_vma = tail_vma;
175 hold_task_mempolicy(priv);
176 /* Start with last addr hint */
177 vma = find_vma(mm, last_addr);
178 if (last_addr && vma) {
179 vma = vma->vm_next;
180 goto out;
181 }
182
183 /*
184 * Check the vma index is within the range and do
185 * sequential scan until m_index.
186 */
187 vma = NULL;
188 if ((unsigned long)l < mm->map_count) {
189 vma = mm->mmap;
190 while (l-- && vma)
191 vma = vma->vm_next;
192 goto out;
193 }
194
195 if (l != mm->map_count)
196 tail_vma = NULL; /* After gate vma */
197
198out:
199 if (vma)
200 return vma;
201
202 release_task_mempolicy(priv);
203 /* End of vmas has been reached */
204 m->version = (tail_vma != NULL)? 0: -1UL;
205 up_read(&mm->mmap_sem);
206 mmput(mm);
207 return tail_vma;
208}
209
210static void *m_next(struct seq_file *m, void *v, loff_t *pos)
211{
212 struct proc_maps_private *priv = m->private;
213 struct vm_area_struct *vma = v;
214 struct vm_area_struct *tail_vma = priv->tail_vma;
215
216 (*pos)++;
217 if (vma && (vma != tail_vma) && vma->vm_next)
218 return vma->vm_next;
219 vma_stop(priv, vma);
220 return (vma != tail_vma)? tail_vma: NULL;
221}
222
223static void m_stop(struct seq_file *m, void *v)
224{
225 struct proc_maps_private *priv = m->private;
226 struct vm_area_struct *vma = v;
227
228 if (!IS_ERR(vma))
229 vma_stop(priv, vma);
230 if (priv->task)
231 put_task_struct(priv->task);
232}
233
234static int do_maps_open(struct inode *inode, struct file *file,
235 const struct seq_operations *ops)
236{
237 struct proc_maps_private *priv;
238 int ret = -ENOMEM;
239 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
240 if (priv) {
241 priv->pid = proc_pid(inode);
242 ret = seq_open(file, ops);
243 if (!ret) {
244 struct seq_file *m = file->private_data;
245 m->private = priv;
246 } else {
247 kfree(priv);
248 }
249 }
250 return ret;
251}
252
253static void
254show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
255{
256 struct mm_struct *mm = vma->vm_mm;
257 struct file *file = vma->vm_file;
258 struct proc_maps_private *priv = m->private;
259 struct task_struct *task = priv->task;
260 vm_flags_t flags = vma->vm_flags;
261 unsigned long ino = 0;
262 unsigned long long pgoff = 0;
263 unsigned long start, end;
264 dev_t dev = 0;
265 const char *name = NULL;
266
267 if (file) {
268 struct inode *inode = file_inode(vma->vm_file);
269 dev = inode->i_sb->s_dev;
270 ino = inode->i_ino;
271 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
272 }
273
274 /* We don't show the stack guard page in /proc/maps */
275 start = vma->vm_start;
276 if (stack_guard_page_start(vma, start))
277 start += PAGE_SIZE;
278 end = vma->vm_end;
279 if (stack_guard_page_end(vma, end))
280 end -= PAGE_SIZE;
281
282 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
283 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
284 start,
285 end,
286 flags & VM_READ ? 'r' : '-',
287 flags & VM_WRITE ? 'w' : '-',
288 flags & VM_EXEC ? 'x' : '-',
289 flags & VM_MAYSHARE ? 's' : 'p',
290 pgoff,
291 MAJOR(dev), MINOR(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_path(m, &file->f_path, "\n");
300 goto done;
301 }
302
303 name = arch_vma_name(vma);
304 if (!name) {
305 pid_t tid;
306
307 if (!mm) {
308 name = "[vdso]";
309 goto done;
310 }
311
312 if (vma->vm_start <= mm->brk &&
313 vma->vm_end >= mm->start_brk) {
314 name = "[heap]";
315 goto done;
316 }
317
318 tid = vm_is_stack(task, vma, is_pid);
319
320 if (tid != 0) {
321 /*
322 * Thread stack in /proc/PID/task/TID/maps or
323 * the main process stack.
324 */
325 if (!is_pid || (vma->vm_start <= mm->start_stack &&
326 vma->vm_end >= mm->start_stack)) {
327 name = "[stack]";
328 } else {
329 /* Thread stack in /proc/PID/maps */
330 seq_pad(m, ' ');
331 seq_printf(m, "[stack:%d]", tid);
332 }
333 }
334 }
335
336done:
337 if (name) {
338 seq_pad(m, ' ');
339 seq_puts(m, name);
340 }
341 seq_putc(m, '\n');
342}
343
344static int show_map(struct seq_file *m, void *v, int is_pid)
345{
346 struct vm_area_struct *vma = v;
347 struct proc_maps_private *priv = m->private;
348 struct task_struct *task = priv->task;
349
350 show_map_vma(m, vma, is_pid);
351
352 if (m->count < m->size) /* vma is copied successfully */
353 m->version = (vma != get_gate_vma(task->mm))
354 ? vma->vm_start : 0;
355 return 0;
356}
357
358static int show_pid_map(struct seq_file *m, void *v)
359{
360 return show_map(m, v, 1);
361}
362
363static int show_tid_map(struct seq_file *m, void *v)
364{
365 return show_map(m, v, 0);
366}
367
368static const struct seq_operations proc_pid_maps_op = {
369 .start = m_start,
370 .next = m_next,
371 .stop = m_stop,
372 .show = show_pid_map
373};
374
375static const struct seq_operations proc_tid_maps_op = {
376 .start = m_start,
377 .next = m_next,
378 .stop = m_stop,
379 .show = show_tid_map
380};
381
382static int pid_maps_open(struct inode *inode, struct file *file)
383{
384 return do_maps_open(inode, file, &proc_pid_maps_op);
385}
386
387static int tid_maps_open(struct inode *inode, struct file *file)
388{
389 return do_maps_open(inode, file, &proc_tid_maps_op);
390}
391
392const struct file_operations proc_pid_maps_operations = {
393 .open = pid_maps_open,
394 .read = seq_read,
395 .llseek = seq_lseek,
396 .release = seq_release_private,
397};
398
399const struct file_operations proc_tid_maps_operations = {
400 .open = tid_maps_open,
401 .read = seq_read,
402 .llseek = seq_lseek,
403 .release = seq_release_private,
404};
405
406/*
407 * Proportional Set Size(PSS): my share of RSS.
408 *
409 * PSS of a process is the count of pages it has in memory, where each
410 * page is divided by the number of processes sharing it. So if a
411 * process has 1000 pages all to itself, and 1000 shared with one other
412 * process, its PSS will be 1500.
413 *
414 * To keep (accumulated) division errors low, we adopt a 64bit
415 * fixed-point pss counter to minimize division errors. So (pss >>
416 * PSS_SHIFT) would be the real byte count.
417 *
418 * A shift of 12 before division means (assuming 4K page size):
419 * - 1M 3-user-pages add up to 8KB errors;
420 * - supports mapcount up to 2^24, or 16M;
421 * - supports PSS up to 2^52 bytes, or 4PB.
422 */
423#define PSS_SHIFT 12
424
425#ifdef CONFIG_PROC_PAGE_MONITOR
426struct mem_size_stats {
427 struct vm_area_struct *vma;
428 unsigned long resident;
429 unsigned long shared_clean;
430 unsigned long shared_dirty;
431 unsigned long private_clean;
432 unsigned long private_dirty;
433 unsigned long referenced;
434 unsigned long anonymous;
435 unsigned long anonymous_thp;
436 unsigned long swap;
437 unsigned long nonlinear;
438 u64 pss;
439};
440
441
442static void smaps_pte_entry(pte_t ptent, unsigned long addr,
443 unsigned long ptent_size, struct mm_walk *walk)
444{
445 struct mem_size_stats *mss = walk->private;
446 struct vm_area_struct *vma = mss->vma;
447 pgoff_t pgoff = linear_page_index(vma, addr);
448 struct page *page = NULL;
449 int mapcount;
450
451 if (pte_present(ptent)) {
452 page = vm_normal_page(vma, addr, ptent);
453 } else if (is_swap_pte(ptent)) {
454 swp_entry_t swpent = pte_to_swp_entry(ptent);
455
456 if (!non_swap_entry(swpent))
457 mss->swap += ptent_size;
458 else if (is_migration_entry(swpent))
459 page = migration_entry_to_page(swpent);
460 } else if (pte_file(ptent)) {
461 if (pte_to_pgoff(ptent) != pgoff)
462 mss->nonlinear += ptent_size;
463 }
464
465 if (!page)
466 return;
467
468 if (PageAnon(page))
469 mss->anonymous += ptent_size;
470
471 if (page->index != pgoff)
472 mss->nonlinear += ptent_size;
473
474 mss->resident += ptent_size;
475 /* Accumulate the size in pages that have been accessed. */
476 if (pte_young(ptent) || PageReferenced(page))
477 mss->referenced += ptent_size;
478 mapcount = page_mapcount(page);
479 if (mapcount >= 2) {
480 if (pte_dirty(ptent) || PageDirty(page))
481 mss->shared_dirty += ptent_size;
482 else
483 mss->shared_clean += ptent_size;
484 mss->pss += (ptent_size << PSS_SHIFT) / mapcount;
485 } else {
486 if (pte_dirty(ptent) || PageDirty(page))
487 mss->private_dirty += ptent_size;
488 else
489 mss->private_clean += ptent_size;
490 mss->pss += (ptent_size << PSS_SHIFT);
491 }
492}
493
494static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
495 struct mm_walk *walk)
496{
497 struct mem_size_stats *mss = walk->private;
498 struct vm_area_struct *vma = mss->vma;
499 pte_t *pte;
500 spinlock_t *ptl;
501
502 if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
503 smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_PMD_SIZE, walk);
504 spin_unlock(ptl);
505 mss->anonymous_thp += HPAGE_PMD_SIZE;
506 return 0;
507 }
508
509 if (pmd_trans_unstable(pmd))
510 return 0;
511 /*
512 * The mmap_sem held all the way back in m_start() is what
513 * keeps khugepaged out of here and from collapsing things
514 * in here.
515 */
516 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
517 for (; addr != end; pte++, addr += PAGE_SIZE)
518 smaps_pte_entry(*pte, addr, PAGE_SIZE, walk);
519 pte_unmap_unlock(pte - 1, ptl);
520 cond_resched();
521 return 0;
522}
523
524static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
525{
526 /*
527 * Don't forget to update Documentation/ on changes.
528 */
529 static const char mnemonics[BITS_PER_LONG][2] = {
530 /*
531 * In case if we meet a flag we don't know about.
532 */
533 [0 ... (BITS_PER_LONG-1)] = "??",
534
535 [ilog2(VM_READ)] = "rd",
536 [ilog2(VM_WRITE)] = "wr",
537 [ilog2(VM_EXEC)] = "ex",
538 [ilog2(VM_SHARED)] = "sh",
539 [ilog2(VM_MAYREAD)] = "mr",
540 [ilog2(VM_MAYWRITE)] = "mw",
541 [ilog2(VM_MAYEXEC)] = "me",
542 [ilog2(VM_MAYSHARE)] = "ms",
543 [ilog2(VM_GROWSDOWN)] = "gd",
544 [ilog2(VM_PFNMAP)] = "pf",
545 [ilog2(VM_DENYWRITE)] = "dw",
546 [ilog2(VM_LOCKED)] = "lo",
547 [ilog2(VM_IO)] = "io",
548 [ilog2(VM_SEQ_READ)] = "sr",
549 [ilog2(VM_RAND_READ)] = "rr",
550 [ilog2(VM_DONTCOPY)] = "dc",
551 [ilog2(VM_DONTEXPAND)] = "de",
552 [ilog2(VM_ACCOUNT)] = "ac",
553 [ilog2(VM_NORESERVE)] = "nr",
554 [ilog2(VM_HUGETLB)] = "ht",
555 [ilog2(VM_NONLINEAR)] = "nl",
556 [ilog2(VM_ARCH_1)] = "ar",
557 [ilog2(VM_DONTDUMP)] = "dd",
558#ifdef CONFIG_MEM_SOFT_DIRTY
559 [ilog2(VM_SOFTDIRTY)] = "sd",
560#endif
561 [ilog2(VM_MIXEDMAP)] = "mm",
562 [ilog2(VM_HUGEPAGE)] = "hg",
563 [ilog2(VM_NOHUGEPAGE)] = "nh",
564 [ilog2(VM_MERGEABLE)] = "mg",
565 };
566 size_t i;
567
568 seq_puts(m, "VmFlags: ");
569 for (i = 0; i < BITS_PER_LONG; i++) {
570 if (vma->vm_flags & (1UL << i)) {
571 seq_printf(m, "%c%c ",
572 mnemonics[i][0], mnemonics[i][1]);
573 }
574 }
575 seq_putc(m, '\n');
576}
577
578static int show_smap(struct seq_file *m, void *v, int is_pid)
579{
580 struct proc_maps_private *priv = m->private;
581 struct task_struct *task = priv->task;
582 struct vm_area_struct *vma = v;
583 struct mem_size_stats mss;
584 struct mm_walk smaps_walk = {
585 .pmd_entry = smaps_pte_range,
586 .mm = vma->vm_mm,
587 .private = &mss,
588 };
589
590 memset(&mss, 0, sizeof mss);
591 mss.vma = vma;
592 /* mmap_sem is held in m_start */
593 if (vma->vm_mm && !is_vm_hugetlb_page(vma))
594 walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
595
596 show_map_vma(m, vma, is_pid);
597
598 seq_printf(m,
599 "Size: %8lu kB\n"
600 "Rss: %8lu kB\n"
601 "Pss: %8lu kB\n"
602 "Shared_Clean: %8lu kB\n"
603 "Shared_Dirty: %8lu kB\n"
604 "Private_Clean: %8lu kB\n"
605 "Private_Dirty: %8lu kB\n"
606 "Referenced: %8lu kB\n"
607 "Anonymous: %8lu kB\n"
608 "AnonHugePages: %8lu kB\n"
609 "Swap: %8lu kB\n"
610 "KernelPageSize: %8lu kB\n"
611 "MMUPageSize: %8lu kB\n"
612 "Locked: %8lu kB\n",
613 (vma->vm_end - vma->vm_start) >> 10,
614 mss.resident >> 10,
615 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
616 mss.shared_clean >> 10,
617 mss.shared_dirty >> 10,
618 mss.private_clean >> 10,
619 mss.private_dirty >> 10,
620 mss.referenced >> 10,
621 mss.anonymous >> 10,
622 mss.anonymous_thp >> 10,
623 mss.swap >> 10,
624 vma_kernel_pagesize(vma) >> 10,
625 vma_mmu_pagesize(vma) >> 10,
626 (vma->vm_flags & VM_LOCKED) ?
627 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
628
629 if (vma->vm_flags & VM_NONLINEAR)
630 seq_printf(m, "Nonlinear: %8lu kB\n",
631 mss.nonlinear >> 10);
632
633 show_smap_vma_flags(m, vma);
634
635 if (m->count < m->size) /* vma is copied successfully */
636 m->version = (vma != get_gate_vma(task->mm))
637 ? vma->vm_start : 0;
638 return 0;
639}
640
641static int show_pid_smap(struct seq_file *m, void *v)
642{
643 return show_smap(m, v, 1);
644}
645
646static int show_tid_smap(struct seq_file *m, void *v)
647{
648 return show_smap(m, v, 0);
649}
650
651static const struct seq_operations proc_pid_smaps_op = {
652 .start = m_start,
653 .next = m_next,
654 .stop = m_stop,
655 .show = show_pid_smap
656};
657
658static const struct seq_operations proc_tid_smaps_op = {
659 .start = m_start,
660 .next = m_next,
661 .stop = m_stop,
662 .show = show_tid_smap
663};
664
665static int pid_smaps_open(struct inode *inode, struct file *file)
666{
667 return do_maps_open(inode, file, &proc_pid_smaps_op);
668}
669
670static int tid_smaps_open(struct inode *inode, struct file *file)
671{
672 return do_maps_open(inode, file, &proc_tid_smaps_op);
673}
674
675const struct file_operations proc_pid_smaps_operations = {
676 .open = pid_smaps_open,
677 .read = seq_read,
678 .llseek = seq_lseek,
679 .release = seq_release_private,
680};
681
682const struct file_operations proc_tid_smaps_operations = {
683 .open = tid_smaps_open,
684 .read = seq_read,
685 .llseek = seq_lseek,
686 .release = seq_release_private,
687};
688
689/*
690 * We do not want to have constant page-shift bits sitting in
691 * pagemap entries and are about to reuse them some time soon.
692 *
693 * Here's the "migration strategy":
694 * 1. when the system boots these bits remain what they are,
695 * but a warning about future change is printed in log;
696 * 2. once anyone clears soft-dirty bits via clear_refs file,
697 * these flag is set to denote, that user is aware of the
698 * new API and those page-shift bits change their meaning.
699 * The respective warning is printed in dmesg;
700 * 3. In a couple of releases we will remove all the mentions
701 * of page-shift in pagemap entries.
702 */
703
704static bool soft_dirty_cleared __read_mostly;
705
706enum clear_refs_types {
707 CLEAR_REFS_ALL = 1,
708 CLEAR_REFS_ANON,
709 CLEAR_REFS_MAPPED,
710 CLEAR_REFS_SOFT_DIRTY,
711 CLEAR_REFS_LAST,
712};
713
714struct clear_refs_private {
715 struct vm_area_struct *vma;
716 enum clear_refs_types type;
717};
718
719static inline void clear_soft_dirty(struct vm_area_struct *vma,
720 unsigned long addr, pte_t *pte)
721{
722#ifdef CONFIG_MEM_SOFT_DIRTY
723 /*
724 * The soft-dirty tracker uses #PF-s to catch writes
725 * to pages, so write-protect the pte as well. See the
726 * Documentation/vm/soft-dirty.txt for full description
727 * of how soft-dirty works.
728 */
729 pte_t ptent = *pte;
730
731 if (pte_present(ptent)) {
732 ptent = pte_wrprotect(ptent);
733 ptent = pte_clear_flags(ptent, _PAGE_SOFT_DIRTY);
734 } else if (is_swap_pte(ptent)) {
735 ptent = pte_swp_clear_soft_dirty(ptent);
736 } else if (pte_file(ptent)) {
737 ptent = pte_file_clear_soft_dirty(ptent);
738 }
739
740 if (vma->vm_flags & VM_SOFTDIRTY)
741 vma->vm_flags &= ~VM_SOFTDIRTY;
742
743 set_pte_at(vma->vm_mm, addr, pte, ptent);
744#endif
745}
746
747static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
748 unsigned long end, struct mm_walk *walk)
749{
750 struct clear_refs_private *cp = walk->private;
751 struct vm_area_struct *vma = cp->vma;
752 pte_t *pte, ptent;
753 spinlock_t *ptl;
754 struct page *page;
755
756 split_huge_page_pmd(vma, addr, pmd);
757 if (pmd_trans_unstable(pmd))
758 return 0;
759
760 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
761 for (; addr != end; pte++, addr += PAGE_SIZE) {
762 ptent = *pte;
763
764 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
765 clear_soft_dirty(vma, addr, pte);
766 continue;
767 }
768
769 if (!pte_present(ptent))
770 continue;
771
772 page = vm_normal_page(vma, addr, ptent);
773 if (!page)
774 continue;
775
776 /* Clear accessed and referenced bits. */
777 ptep_test_and_clear_young(vma, addr, pte);
778 ClearPageReferenced(page);
779 }
780 pte_unmap_unlock(pte - 1, ptl);
781 cond_resched();
782 return 0;
783}
784
785static ssize_t clear_refs_write(struct file *file, const char __user *buf,
786 size_t count, loff_t *ppos)
787{
788 struct task_struct *task;
789 char buffer[PROC_NUMBUF];
790 struct mm_struct *mm;
791 struct vm_area_struct *vma;
792 enum clear_refs_types type;
793 int itype;
794 int rv;
795
796 memset(buffer, 0, sizeof(buffer));
797 if (count > sizeof(buffer) - 1)
798 count = sizeof(buffer) - 1;
799 if (copy_from_user(buffer, buf, count))
800 return -EFAULT;
801 rv = kstrtoint(strstrip(buffer), 10, &itype);
802 if (rv < 0)
803 return rv;
804 type = (enum clear_refs_types)itype;
805 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
806 return -EINVAL;
807
808 if (type == CLEAR_REFS_SOFT_DIRTY) {
809 soft_dirty_cleared = true;
810 pr_warn_once("The pagemap bits 55-60 has changed their meaning! "
811 "See the linux/Documentation/vm/pagemap.txt for details.\n");
812 }
813
814 task = get_proc_task(file_inode(file));
815 if (!task)
816 return -ESRCH;
817 mm = get_task_mm(task);
818 if (mm) {
819 struct clear_refs_private cp = {
820 .type = type,
821 };
822 struct mm_walk clear_refs_walk = {
823 .pmd_entry = clear_refs_pte_range,
824 .mm = mm,
825 .private = &cp,
826 };
827 down_read(&mm->mmap_sem);
828 if (type == CLEAR_REFS_SOFT_DIRTY)
829 mmu_notifier_invalidate_range_start(mm, 0, -1);
830 for (vma = mm->mmap; vma; vma = vma->vm_next) {
831 cp.vma = vma;
832 if (is_vm_hugetlb_page(vma))
833 continue;
834 /*
835 * Writing 1 to /proc/pid/clear_refs affects all pages.
836 *
837 * Writing 2 to /proc/pid/clear_refs only affects
838 * Anonymous pages.
839 *
840 * Writing 3 to /proc/pid/clear_refs only affects file
841 * mapped pages.
842 */
843 if (type == CLEAR_REFS_ANON && vma->vm_file)
844 continue;
845 if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
846 continue;
847 walk_page_range(vma->vm_start, vma->vm_end,
848 &clear_refs_walk);
849 }
850 if (type == CLEAR_REFS_SOFT_DIRTY)
851 mmu_notifier_invalidate_range_end(mm, 0, -1);
852 flush_tlb_mm(mm);
853 up_read(&mm->mmap_sem);
854 mmput(mm);
855 }
856 put_task_struct(task);
857
858 return count;
859}
860
861const struct file_operations proc_clear_refs_operations = {
862 .write = clear_refs_write,
863 .llseek = noop_llseek,
864};
865
866typedef struct {
867 u64 pme;
868} pagemap_entry_t;
869
870struct pagemapread {
871 int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
872 pagemap_entry_t *buffer;
873 bool v2;
874};
875
876#define PAGEMAP_WALK_SIZE (PMD_SIZE)
877#define PAGEMAP_WALK_MASK (PMD_MASK)
878
879#define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
880#define PM_STATUS_BITS 3
881#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
882#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
883#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
884#define PM_PSHIFT_BITS 6
885#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
886#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
887#define __PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
888#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
889#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
890/* in "new" pagemap pshift bits are occupied with more status bits */
891#define PM_STATUS2(v2, x) (__PM_PSHIFT(v2 ? x : PAGE_SHIFT))
892
893#define __PM_SOFT_DIRTY (1LL)
894#define PM_PRESENT PM_STATUS(4LL)
895#define PM_SWAP PM_STATUS(2LL)
896#define PM_FILE PM_STATUS(1LL)
897#define PM_NOT_PRESENT(v2) PM_STATUS2(v2, 0)
898#define PM_END_OF_BUFFER 1
899
900static inline pagemap_entry_t make_pme(u64 val)
901{
902 return (pagemap_entry_t) { .pme = val };
903}
904
905static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
906 struct pagemapread *pm)
907{
908 pm->buffer[pm->pos++] = *pme;
909 if (pm->pos >= pm->len)
910 return PM_END_OF_BUFFER;
911 return 0;
912}
913
914static int pagemap_pte_hole(unsigned long start, unsigned long end,
915 struct mm_walk *walk)
916{
917 struct pagemapread *pm = walk->private;
918 unsigned long addr;
919 int err = 0;
920 pagemap_entry_t pme = make_pme(PM_NOT_PRESENT(pm->v2));
921
922 for (addr = start; addr < end; addr += PAGE_SIZE) {
923 err = add_to_pagemap(addr, &pme, pm);
924 if (err)
925 break;
926 }
927 return err;
928}
929
930static void pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm,
931 struct vm_area_struct *vma, unsigned long addr, pte_t pte)
932{
933 u64 frame, flags;
934 struct page *page = NULL;
935 int flags2 = 0;
936
937 if (pte_present(pte)) {
938 frame = pte_pfn(pte);
939 flags = PM_PRESENT;
940 page = vm_normal_page(vma, addr, pte);
941 if (pte_soft_dirty(pte))
942 flags2 |= __PM_SOFT_DIRTY;
943 } else if (is_swap_pte(pte)) {
944 swp_entry_t entry;
945 if (pte_swp_soft_dirty(pte))
946 flags2 |= __PM_SOFT_DIRTY;
947 entry = pte_to_swp_entry(pte);
948 frame = swp_type(entry) |
949 (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
950 flags = PM_SWAP;
951 if (is_migration_entry(entry))
952 page = migration_entry_to_page(entry);
953 } else {
954 if (vma->vm_flags & VM_SOFTDIRTY)
955 flags2 |= __PM_SOFT_DIRTY;
956 *pme = make_pme(PM_NOT_PRESENT(pm->v2) | PM_STATUS2(pm->v2, flags2));
957 return;
958 }
959
960 if (page && !PageAnon(page))
961 flags |= PM_FILE;
962 if ((vma->vm_flags & VM_SOFTDIRTY))
963 flags2 |= __PM_SOFT_DIRTY;
964
965 *pme = make_pme(PM_PFRAME(frame) | PM_STATUS2(pm->v2, flags2) | flags);
966}
967
968#ifdef CONFIG_TRANSPARENT_HUGEPAGE
969static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm,
970 pmd_t pmd, int offset, int pmd_flags2)
971{
972 /*
973 * Currently pmd for thp is always present because thp can not be
974 * swapped-out, migrated, or HWPOISONed (split in such cases instead.)
975 * This if-check is just to prepare for future implementation.
976 */
977 if (pmd_present(pmd))
978 *pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset)
979 | PM_STATUS2(pm->v2, pmd_flags2) | PM_PRESENT);
980 else
981 *pme = make_pme(PM_NOT_PRESENT(pm->v2) | PM_STATUS2(pm->v2, pmd_flags2));
982}
983#else
984static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm,
985 pmd_t pmd, int offset, int pmd_flags2)
986{
987}
988#endif
989
990static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
991 struct mm_walk *walk)
992{
993 struct vm_area_struct *vma;
994 struct pagemapread *pm = walk->private;
995 spinlock_t *ptl;
996 pte_t *pte;
997 int err = 0;
998 pagemap_entry_t pme = make_pme(PM_NOT_PRESENT(pm->v2));
999
1000 /* find the first VMA at or above 'addr' */
1001 vma = find_vma(walk->mm, addr);
1002 if (vma && pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
1003 int pmd_flags2;
1004
1005 if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(*pmd))
1006 pmd_flags2 = __PM_SOFT_DIRTY;
1007 else
1008 pmd_flags2 = 0;
1009
1010 for (; addr != end; addr += PAGE_SIZE) {
1011 unsigned long offset;
1012
1013 offset = (addr & ~PAGEMAP_WALK_MASK) >>
1014 PAGE_SHIFT;
1015 thp_pmd_to_pagemap_entry(&pme, pm, *pmd, offset, pmd_flags2);
1016 err = add_to_pagemap(addr, &pme, pm);
1017 if (err)
1018 break;
1019 }
1020 spin_unlock(ptl);
1021 return err;
1022 }
1023
1024 if (pmd_trans_unstable(pmd))
1025 return 0;
1026 for (; addr != end; addr += PAGE_SIZE) {
1027 int flags2;
1028
1029 /* check to see if we've left 'vma' behind
1030 * and need a new, higher one */
1031 if (vma && (addr >= vma->vm_end)) {
1032 vma = find_vma(walk->mm, addr);
1033 if (vma && (vma->vm_flags & VM_SOFTDIRTY))
1034 flags2 = __PM_SOFT_DIRTY;
1035 else
1036 flags2 = 0;
1037 pme = make_pme(PM_NOT_PRESENT(pm->v2) | PM_STATUS2(pm->v2, flags2));
1038 }
1039
1040 /* check that 'vma' actually covers this address,
1041 * and that it isn't a huge page vma */
1042 if (vma && (vma->vm_start <= addr) &&
1043 !is_vm_hugetlb_page(vma)) {
1044 pte = pte_offset_map(pmd, addr);
1045 pte_to_pagemap_entry(&pme, pm, vma, addr, *pte);
1046 /* unmap before userspace copy */
1047 pte_unmap(pte);
1048 }
1049 err = add_to_pagemap(addr, &pme, pm);
1050 if (err)
1051 return err;
1052 }
1053
1054 cond_resched();
1055
1056 return err;
1057}
1058
1059#ifdef CONFIG_HUGETLB_PAGE
1060static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm,
1061 pte_t pte, int offset, int flags2)
1062{
1063 if (pte_present(pte))
1064 *pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset) |
1065 PM_STATUS2(pm->v2, flags2) |
1066 PM_PRESENT);
1067 else
1068 *pme = make_pme(PM_NOT_PRESENT(pm->v2) |
1069 PM_STATUS2(pm->v2, flags2));
1070}
1071
1072/* This function walks within one hugetlb entry in the single call */
1073static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
1074 unsigned long addr, unsigned long end,
1075 struct mm_walk *walk)
1076{
1077 struct pagemapread *pm = walk->private;
1078 struct vm_area_struct *vma;
1079 int err = 0;
1080 int flags2;
1081 pagemap_entry_t pme;
1082
1083 vma = find_vma(walk->mm, addr);
1084 WARN_ON_ONCE(!vma);
1085
1086 if (vma && (vma->vm_flags & VM_SOFTDIRTY))
1087 flags2 = __PM_SOFT_DIRTY;
1088 else
1089 flags2 = 0;
1090
1091 for (; addr != end; addr += PAGE_SIZE) {
1092 int offset = (addr & ~hmask) >> PAGE_SHIFT;
1093 huge_pte_to_pagemap_entry(&pme, pm, *pte, offset, flags2);
1094 err = add_to_pagemap(addr, &pme, pm);
1095 if (err)
1096 return err;
1097 }
1098
1099 cond_resched();
1100
1101 return err;
1102}
1103#endif /* HUGETLB_PAGE */
1104
1105/*
1106 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1107 *
1108 * For each page in the address space, this file contains one 64-bit entry
1109 * consisting of the following:
1110 *
1111 * Bits 0-54 page frame number (PFN) if present
1112 * Bits 0-4 swap type if swapped
1113 * Bits 5-54 swap offset if swapped
1114 * Bits 55-60 page shift (page size = 1<<page shift)
1115 * Bit 61 page is file-page or shared-anon
1116 * Bit 62 page swapped
1117 * Bit 63 page present
1118 *
1119 * If the page is not present but in swap, then the PFN contains an
1120 * encoding of the swap file number and the page's offset into the
1121 * swap. Unmapped pages return a null PFN. This allows determining
1122 * precisely which pages are mapped (or in swap) and comparing mapped
1123 * pages between processes.
1124 *
1125 * Efficient users of this interface will use /proc/pid/maps to
1126 * determine which areas of memory are actually mapped and llseek to
1127 * skip over unmapped regions.
1128 */
1129static ssize_t pagemap_read(struct file *file, char __user *buf,
1130 size_t count, loff_t *ppos)
1131{
1132 struct task_struct *task = get_proc_task(file_inode(file));
1133 struct mm_struct *mm;
1134 struct pagemapread pm;
1135 int ret = -ESRCH;
1136 struct mm_walk pagemap_walk = {};
1137 unsigned long src;
1138 unsigned long svpfn;
1139 unsigned long start_vaddr;
1140 unsigned long end_vaddr;
1141 int copied = 0;
1142
1143 if (!task)
1144 goto out;
1145
1146 ret = -EINVAL;
1147 /* file position must be aligned */
1148 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
1149 goto out_task;
1150
1151 ret = 0;
1152 if (!count)
1153 goto out_task;
1154
1155 pm.v2 = soft_dirty_cleared;
1156 pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
1157 pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY);
1158 ret = -ENOMEM;
1159 if (!pm.buffer)
1160 goto out_task;
1161
1162 mm = mm_access(task, PTRACE_MODE_READ);
1163 ret = PTR_ERR(mm);
1164 if (!mm || IS_ERR(mm))
1165 goto out_free;
1166
1167 pagemap_walk.pmd_entry = pagemap_pte_range;
1168 pagemap_walk.pte_hole = pagemap_pte_hole;
1169#ifdef CONFIG_HUGETLB_PAGE
1170 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
1171#endif
1172 pagemap_walk.mm = mm;
1173 pagemap_walk.private = ±
1174
1175 src = *ppos;
1176 svpfn = src / PM_ENTRY_BYTES;
1177 start_vaddr = svpfn << PAGE_SHIFT;
1178 end_vaddr = TASK_SIZE_OF(task);
1179
1180 /* watch out for wraparound */
1181 if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT)
1182 start_vaddr = end_vaddr;
1183
1184 /*
1185 * The odds are that this will stop walking way
1186 * before end_vaddr, because the length of the
1187 * user buffer is tracked in "pm", and the walk
1188 * will stop when we hit the end of the buffer.
1189 */
1190 ret = 0;
1191 while (count && (start_vaddr < end_vaddr)) {
1192 int len;
1193 unsigned long end;
1194
1195 pm.pos = 0;
1196 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
1197 /* overflow ? */
1198 if (end < start_vaddr || end > end_vaddr)
1199 end = end_vaddr;
1200 down_read(&mm->mmap_sem);
1201 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
1202 up_read(&mm->mmap_sem);
1203 start_vaddr = end;
1204
1205 len = min(count, PM_ENTRY_BYTES * pm.pos);
1206 if (copy_to_user(buf, pm.buffer, len)) {
1207 ret = -EFAULT;
1208 goto out_mm;
1209 }
1210 copied += len;
1211 buf += len;
1212 count -= len;
1213 }
1214 *ppos += copied;
1215 if (!ret || ret == PM_END_OF_BUFFER)
1216 ret = copied;
1217
1218out_mm:
1219 mmput(mm);
1220out_free:
1221 kfree(pm.buffer);
1222out_task:
1223 put_task_struct(task);
1224out:
1225 return ret;
1226}
1227
1228static int pagemap_open(struct inode *inode, struct file *file)
1229{
1230 pr_warn_once("Bits 55-60 of /proc/PID/pagemap entries are about "
1231 "to stop being page-shift some time soon. See the "
1232 "linux/Documentation/vm/pagemap.txt for details.\n");
1233 return 0;
1234}
1235
1236const struct file_operations proc_pagemap_operations = {
1237 .llseek = mem_lseek, /* borrow this */
1238 .read = pagemap_read,
1239 .open = pagemap_open,
1240};
1241#endif /* CONFIG_PROC_PAGE_MONITOR */
1242
1243#ifdef CONFIG_NUMA
1244
1245struct numa_maps {
1246 struct vm_area_struct *vma;
1247 unsigned long pages;
1248 unsigned long anon;
1249 unsigned long active;
1250 unsigned long writeback;
1251 unsigned long mapcount_max;
1252 unsigned long dirty;
1253 unsigned long swapcache;
1254 unsigned long node[MAX_NUMNODES];
1255};
1256
1257struct numa_maps_private {
1258 struct proc_maps_private proc_maps;
1259 struct numa_maps md;
1260};
1261
1262static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1263 unsigned long nr_pages)
1264{
1265 int count = page_mapcount(page);
1266
1267 md->pages += nr_pages;
1268 if (pte_dirty || PageDirty(page))
1269 md->dirty += nr_pages;
1270
1271 if (PageSwapCache(page))
1272 md->swapcache += nr_pages;
1273
1274 if (PageActive(page) || PageUnevictable(page))
1275 md->active += nr_pages;
1276
1277 if (PageWriteback(page))
1278 md->writeback += nr_pages;
1279
1280 if (PageAnon(page))
1281 md->anon += nr_pages;
1282
1283 if (count > md->mapcount_max)
1284 md->mapcount_max = count;
1285
1286 md->node[page_to_nid(page)] += nr_pages;
1287}
1288
1289static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1290 unsigned long addr)
1291{
1292 struct page *page;
1293 int nid;
1294
1295 if (!pte_present(pte))
1296 return NULL;
1297
1298 page = vm_normal_page(vma, addr, pte);
1299 if (!page)
1300 return NULL;
1301
1302 if (PageReserved(page))
1303 return NULL;
1304
1305 nid = page_to_nid(page);
1306 if (!node_isset(nid, node_states[N_MEMORY]))
1307 return NULL;
1308
1309 return page;
1310}
1311
1312static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1313 unsigned long end, struct mm_walk *walk)
1314{
1315 struct numa_maps *md;
1316 spinlock_t *ptl;
1317 pte_t *orig_pte;
1318 pte_t *pte;
1319
1320 md = walk->private;
1321
1322 if (pmd_trans_huge_lock(pmd, md->vma, &ptl) == 1) {
1323 pte_t huge_pte = *(pte_t *)pmd;
1324 struct page *page;
1325
1326 page = can_gather_numa_stats(huge_pte, md->vma, addr);
1327 if (page)
1328 gather_stats(page, md, pte_dirty(huge_pte),
1329 HPAGE_PMD_SIZE/PAGE_SIZE);
1330 spin_unlock(ptl);
1331 return 0;
1332 }
1333
1334 if (pmd_trans_unstable(pmd))
1335 return 0;
1336 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1337 do {
1338 struct page *page = can_gather_numa_stats(*pte, md->vma, addr);
1339 if (!page)
1340 continue;
1341 gather_stats(page, md, pte_dirty(*pte), 1);
1342
1343 } while (pte++, addr += PAGE_SIZE, addr != end);
1344 pte_unmap_unlock(orig_pte, ptl);
1345 return 0;
1346}
1347#ifdef CONFIG_HUGETLB_PAGE
1348static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
1349 unsigned long addr, unsigned long end, struct mm_walk *walk)
1350{
1351 struct numa_maps *md;
1352 struct page *page;
1353
1354 if (!pte_present(*pte))
1355 return 0;
1356
1357 page = pte_page(*pte);
1358 if (!page)
1359 return 0;
1360
1361 md = walk->private;
1362 gather_stats(page, md, pte_dirty(*pte), 1);
1363 return 0;
1364}
1365
1366#else
1367static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
1368 unsigned long addr, unsigned long end, struct mm_walk *walk)
1369{
1370 return 0;
1371}
1372#endif
1373
1374/*
1375 * Display pages allocated per node and memory policy via /proc.
1376 */
1377static int show_numa_map(struct seq_file *m, void *v, int is_pid)
1378{
1379 struct numa_maps_private *numa_priv = m->private;
1380 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
1381 struct vm_area_struct *vma = v;
1382 struct numa_maps *md = &numa_priv->md;
1383 struct file *file = vma->vm_file;
1384 struct task_struct *task = proc_priv->task;
1385 struct mm_struct *mm = vma->vm_mm;
1386 struct mm_walk walk = {};
1387 struct mempolicy *pol;
1388 char buffer[64];
1389 int nid;
1390
1391 if (!mm)
1392 return 0;
1393
1394 /* Ensure we start with an empty set of numa_maps statistics. */
1395 memset(md, 0, sizeof(*md));
1396
1397 md->vma = vma;
1398
1399 walk.hugetlb_entry = gather_hugetbl_stats;
1400 walk.pmd_entry = gather_pte_stats;
1401 walk.private = md;
1402 walk.mm = mm;
1403
1404 pol = get_vma_policy(task, vma, vma->vm_start);
1405 mpol_to_str(buffer, sizeof(buffer), pol);
1406 mpol_cond_put(pol);
1407
1408 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1409
1410 if (file) {
1411 seq_printf(m, " file=");
1412 seq_path(m, &file->f_path, "\n\t= ");
1413 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1414 seq_printf(m, " heap");
1415 } else {
1416 pid_t tid = vm_is_stack(task, vma, is_pid);
1417 if (tid != 0) {
1418 /*
1419 * Thread stack in /proc/PID/task/TID/maps or
1420 * the main process stack.
1421 */
1422 if (!is_pid || (vma->vm_start <= mm->start_stack &&
1423 vma->vm_end >= mm->start_stack))
1424 seq_printf(m, " stack");
1425 else
1426 seq_printf(m, " stack:%d", tid);
1427 }
1428 }
1429
1430 if (is_vm_hugetlb_page(vma))
1431 seq_printf(m, " huge");
1432
1433 walk_page_range(vma->vm_start, vma->vm_end, &walk);
1434
1435 if (!md->pages)
1436 goto out;
1437
1438 if (md->anon)
1439 seq_printf(m, " anon=%lu", md->anon);
1440
1441 if (md->dirty)
1442 seq_printf(m, " dirty=%lu", md->dirty);
1443
1444 if (md->pages != md->anon && md->pages != md->dirty)
1445 seq_printf(m, " mapped=%lu", md->pages);
1446
1447 if (md->mapcount_max > 1)
1448 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1449
1450 if (md->swapcache)
1451 seq_printf(m, " swapcache=%lu", md->swapcache);
1452
1453 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1454 seq_printf(m, " active=%lu", md->active);
1455
1456 if (md->writeback)
1457 seq_printf(m, " writeback=%lu", md->writeback);
1458
1459 for_each_node_state(nid, N_MEMORY)
1460 if (md->node[nid])
1461 seq_printf(m, " N%d=%lu", nid, md->node[nid]);
1462out:
1463 seq_putc(m, '\n');
1464
1465 if (m->count < m->size)
1466 m->version = (vma != proc_priv->tail_vma) ? vma->vm_start : 0;
1467 return 0;
1468}
1469
1470static int show_pid_numa_map(struct seq_file *m, void *v)
1471{
1472 return show_numa_map(m, v, 1);
1473}
1474
1475static int show_tid_numa_map(struct seq_file *m, void *v)
1476{
1477 return show_numa_map(m, v, 0);
1478}
1479
1480static const struct seq_operations proc_pid_numa_maps_op = {
1481 .start = m_start,
1482 .next = m_next,
1483 .stop = m_stop,
1484 .show = show_pid_numa_map,
1485};
1486
1487static const struct seq_operations proc_tid_numa_maps_op = {
1488 .start = m_start,
1489 .next = m_next,
1490 .stop = m_stop,
1491 .show = show_tid_numa_map,
1492};
1493
1494static int numa_maps_open(struct inode *inode, struct file *file,
1495 const struct seq_operations *ops)
1496{
1497 struct numa_maps_private *priv;
1498 int ret = -ENOMEM;
1499 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1500 if (priv) {
1501 priv->proc_maps.pid = proc_pid(inode);
1502 ret = seq_open(file, ops);
1503 if (!ret) {
1504 struct seq_file *m = file->private_data;
1505 m->private = priv;
1506 } else {
1507 kfree(priv);
1508 }
1509 }
1510 return ret;
1511}
1512
1513static int pid_numa_maps_open(struct inode *inode, struct file *file)
1514{
1515 return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
1516}
1517
1518static int tid_numa_maps_open(struct inode *inode, struct file *file)
1519{
1520 return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
1521}
1522
1523const struct file_operations proc_pid_numa_maps_operations = {
1524 .open = pid_numa_maps_open,
1525 .read = seq_read,
1526 .llseek = seq_lseek,
1527 .release = seq_release_private,
1528};
1529
1530const struct file_operations proc_tid_numa_maps_operations = {
1531 .open = tid_numa_maps_open,
1532 .read = seq_read,
1533 .llseek = seq_lseek,
1534 .release = seq_release_private,
1535};
1536#endif /* CONFIG_NUMA */