Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a520110e | 2 | #include <linux/pagewalk.h> |
17fca131 | 3 | #include <linux/mm_inline.h> |
1da177e4 | 4 | #include <linux/hugetlb.h> |
22e057c5 | 5 | #include <linux/huge_mm.h> |
1da177e4 | 6 | #include <linux/mount.h> |
8b479335 | 7 | #include <linux/ksm.h> |
1da177e4 | 8 | #include <linux/seq_file.h> |
e070ad49 | 9 | #include <linux/highmem.h> |
5096add8 | 10 | #include <linux/ptrace.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
6e21c8f1 CL |
12 | #include <linux/pagemap.h> |
13 | #include <linux/mempolicy.h> | |
22e057c5 | 14 | #include <linux/rmap.h> |
85863e47 | 15 | #include <linux/swap.h> |
6e84f315 | 16 | #include <linux/sched/mm.h> |
85863e47 | 17 | #include <linux/swapops.h> |
0f8975ec | 18 | #include <linux/mmu_notifier.h> |
33c3fc71 | 19 | #include <linux/page_idle.h> |
6a15a370 | 20 | #include <linux/shmem_fs.h> |
b3a81d08 | 21 | #include <linux/uaccess.h> |
27cca866 | 22 | #include <linux/pkeys.h> |
52526ca7 MUA |
23 | #include <linux/minmax.h> |
24 | #include <linux/overflow.h> | |
e070ad49 | 25 | |
1da177e4 | 26 | #include <asm/elf.h> |
b3a81d08 | 27 | #include <asm/tlb.h> |
e070ad49 | 28 | #include <asm/tlbflush.h> |
1da177e4 LT |
29 | #include "internal.h" |
30 | ||
d1be35cb AV |
31 | #define SEQ_PUT_DEC(str, val) \ |
32 | seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8) | |
df5f8314 | 33 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 34 | { |
af5b0f6a | 35 | unsigned long text, lib, swap, anon, file, shmem; |
365e9c87 HD |
36 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
37 | ||
8cee852e JM |
38 | anon = get_mm_counter(mm, MM_ANONPAGES); |
39 | file = get_mm_counter(mm, MM_FILEPAGES); | |
40 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); | |
41 | ||
365e9c87 HD |
42 | /* |
43 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
44 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
45 | * collector of these hiwater stats must therefore get total_vm | |
46 | * and rss too, which will usually be the higher. Barriers? not | |
47 | * worth the effort, such snapshots can always be inconsistent. | |
48 | */ | |
49 | hiwater_vm = total_vm = mm->total_vm; | |
50 | if (hiwater_vm < mm->hiwater_vm) | |
51 | hiwater_vm = mm->hiwater_vm; | |
8cee852e | 52 | hiwater_rss = total_rss = anon + file + shmem; |
365e9c87 HD |
53 | if (hiwater_rss < mm->hiwater_rss) |
54 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 | 55 | |
8526d84f KK |
56 | /* split executable areas between text and lib */ |
57 | text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK); | |
58 | text = min(text, mm->exec_vm << PAGE_SHIFT); | |
59 | lib = (mm->exec_vm << PAGE_SHIFT) - text; | |
60 | ||
b084d435 | 61 | swap = get_mm_counter(mm, MM_SWAPENTS); |
d1be35cb AV |
62 | SEQ_PUT_DEC("VmPeak:\t", hiwater_vm); |
63 | SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm); | |
64 | SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm); | |
70f8a3ca | 65 | SEQ_PUT_DEC(" kB\nVmPin:\t", atomic64_read(&mm->pinned_vm)); |
d1be35cb AV |
66 | SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss); |
67 | SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss); | |
68 | SEQ_PUT_DEC(" kB\nRssAnon:\t", anon); | |
69 | SEQ_PUT_DEC(" kB\nRssFile:\t", file); | |
70 | SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem); | |
71 | SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm); | |
72 | SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm); | |
73 | seq_put_decimal_ull_width(m, | |
74 | " kB\nVmExe:\t", text >> 10, 8); | |
75 | seq_put_decimal_ull_width(m, | |
76 | " kB\nVmLib:\t", lib >> 10, 8); | |
77 | seq_put_decimal_ull_width(m, | |
78 | " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8); | |
79 | SEQ_PUT_DEC(" kB\nVmSwap:\t", swap); | |
80 | seq_puts(m, " kB\n"); | |
5d317b2b | 81 | hugetlb_report_usage(m, mm); |
1da177e4 | 82 | } |
d1be35cb | 83 | #undef SEQ_PUT_DEC |
1da177e4 LT |
84 | |
85 | unsigned long task_vsize(struct mm_struct *mm) | |
86 | { | |
87 | return PAGE_SIZE * mm->total_vm; | |
88 | } | |
89 | ||
a2ade7b6 AD |
90 | unsigned long task_statm(struct mm_struct *mm, |
91 | unsigned long *shared, unsigned long *text, | |
92 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 93 | { |
eca56ff9 JM |
94 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
95 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
96 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
97 | >> PAGE_SHIFT; | |
84638335 | 98 | *data = mm->data_vm + mm->stack_vm; |
d559db08 | 99 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
100 | return mm->total_vm; |
101 | } | |
102 | ||
9e781440 KH |
103 | #ifdef CONFIG_NUMA |
104 | /* | |
498f2371 | 105 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
106 | */ |
107 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
108 | { | |
109 | struct task_struct *task = priv->task; | |
110 | ||
111 | task_lock(task); | |
498f2371 | 112 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
113 | mpol_get(priv->task_mempolicy); |
114 | task_unlock(task); | |
115 | } | |
116 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
117 | { | |
118 | mpol_put(priv->task_mempolicy); | |
119 | } | |
120 | #else | |
121 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
122 | { | |
123 | } | |
124 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
125 | { | |
126 | } | |
127 | #endif | |
128 | ||
c4c84f06 MWO |
129 | static struct vm_area_struct *proc_get_vma(struct proc_maps_private *priv, |
130 | loff_t *ppos) | |
131 | { | |
132 | struct vm_area_struct *vma = vma_next(&priv->iter); | |
133 | ||
134 | if (vma) { | |
135 | *ppos = vma->vm_start; | |
136 | } else { | |
137 | *ppos = -2UL; | |
138 | vma = get_gate_vma(priv->mm); | |
139 | } | |
140 | ||
141 | return vma; | |
142 | } | |
143 | ||
0c255321 | 144 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 145 | { |
a6198797 | 146 | struct proc_maps_private *priv = m->private; |
4781f2c3 | 147 | unsigned long last_addr = *ppos; |
a6198797 | 148 | struct mm_struct *mm; |
a6198797 | 149 | |
c2e88d22 | 150 | /* See m_next(). Zero at the start or after lseek. */ |
b8c20a9b ON |
151 | if (last_addr == -1UL) |
152 | return NULL; | |
153 | ||
2c03376d | 154 | priv->task = get_proc_task(priv->inode); |
a6198797 | 155 | if (!priv->task) |
ec6fd8a4 | 156 | return ERR_PTR(-ESRCH); |
a6198797 | 157 | |
29a40ace | 158 | mm = priv->mm; |
d07ded61 MWO |
159 | if (!mm || !mmget_not_zero(mm)) { |
160 | put_task_struct(priv->task); | |
161 | priv->task = NULL; | |
29a40ace | 162 | return NULL; |
d07ded61 | 163 | } |
a6198797 | 164 | |
d8ed45c5 | 165 | if (mmap_read_lock_killable(mm)) { |
8a713e7d | 166 | mmput(mm); |
d07ded61 MWO |
167 | put_task_struct(priv->task); |
168 | priv->task = NULL; | |
8a713e7d KK |
169 | return ERR_PTR(-EINTR); |
170 | } | |
171 | ||
c4c84f06 | 172 | vma_iter_init(&priv->iter, mm, last_addr); |
9e781440 | 173 | hold_task_mempolicy(priv); |
c4c84f06 MWO |
174 | if (last_addr == -2UL) |
175 | return get_gate_vma(mm); | |
59b4bf12 | 176 | |
c4c84f06 | 177 | return proc_get_vma(priv, ppos); |
a6198797 MM |
178 | } |
179 | ||
4781f2c3 | 180 | static void *m_next(struct seq_file *m, void *v, loff_t *ppos) |
a6198797 | 181 | { |
c4c84f06 MWO |
182 | if (*ppos == -2UL) { |
183 | *ppos = -1UL; | |
184 | return NULL; | |
185 | } | |
186 | return proc_get_vma(m->private, ppos); | |
a6198797 MM |
187 | } |
188 | ||
189 | static void m_stop(struct seq_file *m, void *v) | |
190 | { | |
191 | struct proc_maps_private *priv = m->private; | |
d07ded61 | 192 | struct mm_struct *mm = priv->mm; |
a6198797 | 193 | |
d07ded61 MWO |
194 | if (!priv->task) |
195 | return; | |
196 | ||
197 | release_task_mempolicy(priv); | |
d8ed45c5 | 198 | mmap_read_unlock(mm); |
d07ded61 MWO |
199 | mmput(mm); |
200 | put_task_struct(priv->task); | |
201 | priv->task = NULL; | |
a6198797 MM |
202 | } |
203 | ||
4db7d0ee ON |
204 | static int proc_maps_open(struct inode *inode, struct file *file, |
205 | const struct seq_operations *ops, int psize) | |
206 | { | |
207 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
208 | ||
209 | if (!priv) | |
210 | return -ENOMEM; | |
211 | ||
2c03376d | 212 | priv->inode = inode; |
29a40ace ON |
213 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
214 | if (IS_ERR(priv->mm)) { | |
215 | int err = PTR_ERR(priv->mm); | |
216 | ||
217 | seq_release_private(inode, file); | |
218 | return err; | |
219 | } | |
220 | ||
4db7d0ee ON |
221 | return 0; |
222 | } | |
223 | ||
29a40ace ON |
224 | static int proc_map_release(struct inode *inode, struct file *file) |
225 | { | |
226 | struct seq_file *seq = file->private_data; | |
227 | struct proc_maps_private *priv = seq->private; | |
228 | ||
229 | if (priv->mm) | |
230 | mmdrop(priv->mm); | |
231 | ||
232 | return seq_release_private(inode, file); | |
233 | } | |
234 | ||
a6198797 | 235 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 236 | const struct seq_operations *ops) |
a6198797 | 237 | { |
4db7d0ee ON |
238 | return proc_maps_open(inode, file, ops, |
239 | sizeof(struct proc_maps_private)); | |
a6198797 | 240 | } |
e070ad49 | 241 | |
493b0e9d DC |
242 | static void show_vma_header_prefix(struct seq_file *m, |
243 | unsigned long start, unsigned long end, | |
244 | vm_flags_t flags, unsigned long long pgoff, | |
245 | dev_t dev, unsigned long ino) | |
246 | { | |
247 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); | |
0e3dc019 AV |
248 | seq_put_hex_ll(m, NULL, start, 8); |
249 | seq_put_hex_ll(m, "-", end, 8); | |
250 | seq_putc(m, ' '); | |
251 | seq_putc(m, flags & VM_READ ? 'r' : '-'); | |
252 | seq_putc(m, flags & VM_WRITE ? 'w' : '-'); | |
253 | seq_putc(m, flags & VM_EXEC ? 'x' : '-'); | |
254 | seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p'); | |
255 | seq_put_hex_ll(m, " ", pgoff, 8); | |
256 | seq_put_hex_ll(m, " ", MAJOR(dev), 2); | |
257 | seq_put_hex_ll(m, ":", MINOR(dev), 2); | |
258 | seq_put_decimal_ull(m, " ", ino); | |
259 | seq_putc(m, ' '); | |
493b0e9d DC |
260 | } |
261 | ||
b7643757 | 262 | static void |
871305bb | 263 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma) |
1da177e4 | 264 | { |
d09e8ca6 | 265 | struct anon_vma_name *anon_name = NULL; |
e070ad49 ML |
266 | struct mm_struct *mm = vma->vm_mm; |
267 | struct file *file = vma->vm_file; | |
ca16d140 | 268 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 269 | unsigned long ino = 0; |
6260a4b0 | 270 | unsigned long long pgoff = 0; |
a09a79f6 | 271 | unsigned long start, end; |
1da177e4 | 272 | dev_t dev = 0; |
b7643757 | 273 | const char *name = NULL; |
1da177e4 LT |
274 | |
275 | if (file) { | |
3efdc78f AV |
276 | const struct inode *inode = file_user_inode(vma->vm_file); |
277 | ||
1da177e4 LT |
278 | dev = inode->i_sb->s_dev; |
279 | ino = inode->i_ino; | |
6260a4b0 | 280 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
281 | } |
282 | ||
d7824370 | 283 | start = vma->vm_start; |
a09a79f6 | 284 | end = vma->vm_end; |
493b0e9d | 285 | show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); |
d09e8ca6 PT |
286 | if (mm) |
287 | anon_name = anon_vma_name(vma); | |
1da177e4 LT |
288 | |
289 | /* | |
290 | * Print the dentry name for named mappings, and a | |
291 | * special [heap] marker for the heap: | |
292 | */ | |
e070ad49 | 293 | if (file) { |
652586df | 294 | seq_pad(m, ' '); |
d09e8ca6 PT |
295 | /* |
296 | * If user named this anon shared memory via | |
297 | * prctl(PR_SET_VMA ..., use the provided name. | |
298 | */ | |
299 | if (anon_name) | |
300 | seq_printf(m, "[anon_shmem:%s]", anon_name->name); | |
301 | else | |
08582d67 | 302 | seq_path(m, file_user_path(file), "\n"); |
b7643757 SP |
303 | goto done; |
304 | } | |
305 | ||
78d683e8 AL |
306 | if (vma->vm_ops && vma->vm_ops->name) { |
307 | name = vma->vm_ops->name(vma); | |
308 | if (name) | |
309 | goto done; | |
310 | } | |
311 | ||
b7643757 SP |
312 | name = arch_vma_name(vma); |
313 | if (!name) { | |
b7643757 SP |
314 | if (!mm) { |
315 | name = "[vdso]"; | |
316 | goto done; | |
317 | } | |
318 | ||
11250fd1 | 319 | if (vma_is_initial_heap(vma)) { |
b7643757 SP |
320 | name = "[heap]"; |
321 | goto done; | |
322 | } | |
323 | ||
11250fd1 | 324 | if (vma_is_initial_stack(vma)) { |
65376df5 | 325 | name = "[stack]"; |
9a10064f CC |
326 | goto done; |
327 | } | |
328 | ||
9a10064f CC |
329 | if (anon_name) { |
330 | seq_pad(m, ' '); | |
5c26f6ac | 331 | seq_printf(m, "[anon:%s]", anon_name->name); |
9a10064f | 332 | } |
b7643757 SP |
333 | } |
334 | ||
335 | done: | |
336 | if (name) { | |
652586df | 337 | seq_pad(m, ' '); |
b7643757 | 338 | seq_puts(m, name); |
1da177e4 LT |
339 | } |
340 | seq_putc(m, '\n'); | |
7c88db0c JK |
341 | } |
342 | ||
871305bb | 343 | static int show_map(struct seq_file *m, void *v) |
7c88db0c | 344 | { |
871305bb | 345 | show_map_vma(m, v); |
1da177e4 LT |
346 | return 0; |
347 | } | |
348 | ||
03a44825 | 349 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
350 | .start = m_start, |
351 | .next = m_next, | |
352 | .stop = m_stop, | |
871305bb | 353 | .show = show_map |
a6198797 MM |
354 | }; |
355 | ||
b7643757 | 356 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
357 | { |
358 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
359 | } | |
360 | ||
b7643757 SP |
361 | const struct file_operations proc_pid_maps_operations = { |
362 | .open = pid_maps_open, | |
363 | .read = seq_read, | |
364 | .llseek = seq_lseek, | |
29a40ace | 365 | .release = proc_map_release, |
b7643757 SP |
366 | }; |
367 | ||
a6198797 MM |
368 | /* |
369 | * Proportional Set Size(PSS): my share of RSS. | |
370 | * | |
371 | * PSS of a process is the count of pages it has in memory, where each | |
372 | * page is divided by the number of processes sharing it. So if a | |
373 | * process has 1000 pages all to itself, and 1000 shared with one other | |
374 | * process, its PSS will be 1500. | |
375 | * | |
376 | * To keep (accumulated) division errors low, we adopt a 64bit | |
377 | * fixed-point pss counter to minimize division errors. So (pss >> | |
378 | * PSS_SHIFT) would be the real byte count. | |
379 | * | |
380 | * A shift of 12 before division means (assuming 4K page size): | |
381 | * - 1M 3-user-pages add up to 8KB errors; | |
382 | * - supports mapcount up to 2^24, or 16M; | |
383 | * - supports PSS up to 2^52 bytes, or 4PB. | |
384 | */ | |
385 | #define PSS_SHIFT 12 | |
386 | ||
1e883281 | 387 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 388 | struct mem_size_stats { |
a6198797 MM |
389 | unsigned long resident; |
390 | unsigned long shared_clean; | |
391 | unsigned long shared_dirty; | |
392 | unsigned long private_clean; | |
393 | unsigned long private_dirty; | |
394 | unsigned long referenced; | |
b40d4f84 | 395 | unsigned long anonymous; |
cf8496ea | 396 | unsigned long lazyfree; |
4031a219 | 397 | unsigned long anonymous_thp; |
65c45377 | 398 | unsigned long shmem_thp; |
60fbf0ab | 399 | unsigned long file_thp; |
214e471f | 400 | unsigned long swap; |
25ee01a2 NH |
401 | unsigned long shared_hugetlb; |
402 | unsigned long private_hugetlb; | |
8b479335 | 403 | unsigned long ksm; |
a6198797 | 404 | u64 pss; |
ee2ad71b LS |
405 | u64 pss_anon; |
406 | u64 pss_file; | |
407 | u64 pss_shmem; | |
30934843 | 408 | u64 pss_dirty; |
493b0e9d | 409 | u64 pss_locked; |
8334b962 | 410 | u64 swap_pss; |
a6198797 MM |
411 | }; |
412 | ||
ee2ad71b LS |
413 | static void smaps_page_accumulate(struct mem_size_stats *mss, |
414 | struct page *page, unsigned long size, unsigned long pss, | |
415 | bool dirty, bool locked, bool private) | |
416 | { | |
417 | mss->pss += pss; | |
418 | ||
419 | if (PageAnon(page)) | |
420 | mss->pss_anon += pss; | |
421 | else if (PageSwapBacked(page)) | |
422 | mss->pss_shmem += pss; | |
423 | else | |
424 | mss->pss_file += pss; | |
425 | ||
426 | if (locked) | |
427 | mss->pss_locked += pss; | |
428 | ||
429 | if (dirty || PageDirty(page)) { | |
30934843 | 430 | mss->pss_dirty += pss; |
ee2ad71b LS |
431 | if (private) |
432 | mss->private_dirty += size; | |
433 | else | |
434 | mss->shared_dirty += size; | |
435 | } else { | |
436 | if (private) | |
437 | mss->private_clean += size; | |
438 | else | |
439 | mss->shared_clean += size; | |
440 | } | |
441 | } | |
442 | ||
c164e038 | 443 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
24d7275c YS |
444 | bool compound, bool young, bool dirty, bool locked, |
445 | bool migration) | |
c164e038 | 446 | { |
d8c6546b | 447 | int i, nr = compound ? compound_nr(page) : 1; |
afd9883f | 448 | unsigned long size = nr * PAGE_SIZE; |
c164e038 | 449 | |
ee2ad71b LS |
450 | /* |
451 | * First accumulate quantities that depend only on |size| and the type | |
452 | * of the compound page. | |
453 | */ | |
cf8496ea | 454 | if (PageAnon(page)) { |
c164e038 | 455 | mss->anonymous += size; |
cf8496ea SL |
456 | if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) |
457 | mss->lazyfree += size; | |
458 | } | |
c164e038 | 459 | |
8b479335 SR |
460 | if (PageKsm(page)) |
461 | mss->ksm += size; | |
462 | ||
c164e038 KS |
463 | mss->resident += size; |
464 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 465 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 | 466 | mss->referenced += size; |
c164e038 | 467 | |
afd9883f | 468 | /* |
ee2ad71b LS |
469 | * Then accumulate quantities that may depend on sharing, or that may |
470 | * differ page-by-page. | |
471 | * | |
afd9883f KS |
472 | * page_count(page) == 1 guarantees the page is mapped exactly once. |
473 | * If any subpage of the compound page mapped with PTE it would elevate | |
474 | * page_count(). | |
24d7275c YS |
475 | * |
476 | * The page_mapcount() is called to get a snapshot of the mapcount. | |
477 | * Without holding the page lock this snapshot can be slightly wrong as | |
478 | * we cannot always read the mapcount atomically. It is not safe to | |
479 | * call page_mapcount() even with PTL held if the page is not mapped, | |
480 | * especially for migration entries. Treat regular migration entries | |
481 | * as mapcount == 1. | |
afd9883f | 482 | */ |
24d7275c | 483 | if ((page_count(page) == 1) || migration) { |
ee2ad71b LS |
484 | smaps_page_accumulate(mss, page, size, size << PSS_SHIFT, dirty, |
485 | locked, true); | |
afd9883f KS |
486 | return; |
487 | } | |
afd9883f KS |
488 | for (i = 0; i < nr; i++, page++) { |
489 | int mapcount = page_mapcount(page); | |
ee2ad71b LS |
490 | unsigned long pss = PAGE_SIZE << PSS_SHIFT; |
491 | if (mapcount >= 2) | |
492 | pss /= mapcount; | |
493 | smaps_page_accumulate(mss, page, PAGE_SIZE, pss, dirty, locked, | |
494 | mapcount < 2); | |
c164e038 KS |
495 | } |
496 | } | |
ae11c4d9 | 497 | |
c261e7d9 | 498 | #ifdef CONFIG_SHMEM |
c261e7d9 | 499 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
b7a16c7a | 500 | __always_unused int depth, struct mm_walk *walk) |
c261e7d9 VB |
501 | { |
502 | struct mem_size_stats *mss = walk->private; | |
10c848c8 | 503 | struct vm_area_struct *vma = walk->vma; |
c261e7d9 | 504 | |
10c848c8 PX |
505 | mss->swap += shmem_partial_swap_usage(walk->vma->vm_file->f_mapping, |
506 | linear_page_index(vma, addr), | |
507 | linear_page_index(vma, end)); | |
c261e7d9 VB |
508 | |
509 | return 0; | |
510 | } | |
7b86ac33 CH |
511 | #else |
512 | #define smaps_pte_hole NULL | |
513 | #endif /* CONFIG_SHMEM */ | |
c261e7d9 | 514 | |
23010032 PX |
515 | static void smaps_pte_hole_lookup(unsigned long addr, struct mm_walk *walk) |
516 | { | |
517 | #ifdef CONFIG_SHMEM | |
518 | if (walk->ops->pte_hole) { | |
519 | /* depth is not used */ | |
520 | smaps_pte_hole(addr, addr + PAGE_SIZE, 0, walk); | |
521 | } | |
522 | #endif | |
523 | } | |
524 | ||
c164e038 KS |
525 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
526 | struct mm_walk *walk) | |
ae11c4d9 DH |
527 | { |
528 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 529 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 530 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
b1d4d9e0 | 531 | struct page *page = NULL; |
efd41493 | 532 | bool migration = false, young = false, dirty = false; |
c33c7948 | 533 | pte_t ptent = ptep_get(pte); |
ae11c4d9 | 534 | |
c33c7948 RR |
535 | if (pte_present(ptent)) { |
536 | page = vm_normal_page(vma, addr, ptent); | |
537 | young = pte_young(ptent); | |
538 | dirty = pte_dirty(ptent); | |
539 | } else if (is_swap_pte(ptent)) { | |
540 | swp_entry_t swpent = pte_to_swp_entry(ptent); | |
ae11c4d9 | 541 | |
8334b962 MK |
542 | if (!non_swap_entry(swpent)) { |
543 | int mapcount; | |
544 | ||
c164e038 | 545 | mss->swap += PAGE_SIZE; |
8334b962 MK |
546 | mapcount = swp_swapcount(swpent); |
547 | if (mapcount >= 2) { | |
548 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
549 | ||
550 | do_div(pss_delta, mapcount); | |
551 | mss->swap_pss += pss_delta; | |
552 | } else { | |
553 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
554 | } | |
24d7275c YS |
555 | } else if (is_pfn_swap_entry(swpent)) { |
556 | if (is_migration_entry(swpent)) | |
557 | migration = true; | |
af5cdaf8 | 558 | page = pfn_swap_entry_to_page(swpent); |
24d7275c | 559 | } |
23010032 PX |
560 | } else { |
561 | smaps_pte_hole_lookup(addr, walk); | |
48131e03 | 562 | return; |
b1d4d9e0 | 563 | } |
ae11c4d9 | 564 | |
ae11c4d9 DH |
565 | if (!page) |
566 | return; | |
afd9883f | 567 | |
efd41493 | 568 | smaps_account(mss, page, false, young, dirty, locked, migration); |
ae11c4d9 DH |
569 | } |
570 | ||
c164e038 KS |
571 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
572 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
573 | struct mm_walk *walk) | |
574 | { | |
575 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 576 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 577 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
c94b6923 | 578 | struct page *page = NULL; |
24d7275c | 579 | bool migration = false; |
c94b6923 HY |
580 | |
581 | if (pmd_present(*pmd)) { | |
8b9c1cc0 | 582 | page = vm_normal_page_pmd(vma, addr, *pmd); |
c94b6923 HY |
583 | } else if (unlikely(thp_migration_supported() && is_swap_pmd(*pmd))) { |
584 | swp_entry_t entry = pmd_to_swp_entry(*pmd); | |
c164e038 | 585 | |
24d7275c YS |
586 | if (is_migration_entry(entry)) { |
587 | migration = true; | |
af5cdaf8 | 588 | page = pfn_swap_entry_to_page(entry); |
24d7275c | 589 | } |
c94b6923 | 590 | } |
c164e038 KS |
591 | if (IS_ERR_OR_NULL(page)) |
592 | return; | |
65c45377 KS |
593 | if (PageAnon(page)) |
594 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
595 | else if (PageSwapBacked(page)) | |
596 | mss->shmem_thp += HPAGE_PMD_SIZE; | |
ca120cf6 DW |
597 | else if (is_zone_device_page(page)) |
598 | /* pass */; | |
65c45377 | 599 | else |
60fbf0ab | 600 | mss->file_thp += HPAGE_PMD_SIZE; |
24d7275c YS |
601 | |
602 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd), | |
603 | locked, migration); | |
c164e038 KS |
604 | } |
605 | #else | |
606 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
607 | struct mm_walk *walk) | |
608 | { | |
609 | } | |
610 | #endif | |
611 | ||
b3ae5acb | 612 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 613 | struct mm_walk *walk) |
e070ad49 | 614 | { |
14eb6fdd | 615 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 616 | pte_t *pte; |
705e87c0 | 617 | spinlock_t *ptl; |
e070ad49 | 618 | |
b6ec57f4 KS |
619 | ptl = pmd_trans_huge_lock(pmd, vma); |
620 | if (ptl) { | |
c94b6923 | 621 | smaps_pmd_entry(pmd, addr, walk); |
bf929152 | 622 | spin_unlock(ptl); |
14038302 | 623 | goto out; |
22e057c5 | 624 | } |
1a5a9906 | 625 | |
705e87c0 | 626 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
7780d040 HD |
627 | if (!pte) { |
628 | walk->action = ACTION_AGAIN; | |
629 | return 0; | |
630 | } | |
ae11c4d9 | 631 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 632 | smaps_pte_entry(pte, addr, walk); |
705e87c0 | 633 | pte_unmap_unlock(pte - 1, ptl); |
14038302 | 634 | out: |
705e87c0 | 635 | cond_resched(); |
b3ae5acb | 636 | return 0; |
e070ad49 ML |
637 | } |
638 | ||
834f82e2 CG |
639 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
640 | { | |
641 | /* | |
642 | * Don't forget to update Documentation/ on changes. | |
643 | */ | |
644 | static const char mnemonics[BITS_PER_LONG][2] = { | |
645 | /* | |
646 | * In case if we meet a flag we don't know about. | |
647 | */ | |
648 | [0 ... (BITS_PER_LONG-1)] = "??", | |
649 | ||
650 | [ilog2(VM_READ)] = "rd", | |
651 | [ilog2(VM_WRITE)] = "wr", | |
652 | [ilog2(VM_EXEC)] = "ex", | |
653 | [ilog2(VM_SHARED)] = "sh", | |
654 | [ilog2(VM_MAYREAD)] = "mr", | |
655 | [ilog2(VM_MAYWRITE)] = "mw", | |
656 | [ilog2(VM_MAYEXEC)] = "me", | |
657 | [ilog2(VM_MAYSHARE)] = "ms", | |
658 | [ilog2(VM_GROWSDOWN)] = "gd", | |
659 | [ilog2(VM_PFNMAP)] = "pf", | |
834f82e2 CG |
660 | [ilog2(VM_LOCKED)] = "lo", |
661 | [ilog2(VM_IO)] = "io", | |
662 | [ilog2(VM_SEQ_READ)] = "sr", | |
663 | [ilog2(VM_RAND_READ)] = "rr", | |
664 | [ilog2(VM_DONTCOPY)] = "dc", | |
665 | [ilog2(VM_DONTEXPAND)] = "de", | |
8614d6c5 | 666 | [ilog2(VM_LOCKONFAULT)] = "lf", |
834f82e2 CG |
667 | [ilog2(VM_ACCOUNT)] = "ac", |
668 | [ilog2(VM_NORESERVE)] = "nr", | |
669 | [ilog2(VM_HUGETLB)] = "ht", | |
b6fb293f | 670 | [ilog2(VM_SYNC)] = "sf", |
834f82e2 | 671 | [ilog2(VM_ARCH_1)] = "ar", |
d2cd9ede | 672 | [ilog2(VM_WIPEONFORK)] = "wf", |
834f82e2 | 673 | [ilog2(VM_DONTDUMP)] = "dd", |
424037b7 DK |
674 | #ifdef CONFIG_ARM64_BTI |
675 | [ilog2(VM_ARM64_BTI)] = "bt", | |
676 | #endif | |
ec8e41ae NH |
677 | #ifdef CONFIG_MEM_SOFT_DIRTY |
678 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
679 | #endif | |
834f82e2 CG |
680 | [ilog2(VM_MIXEDMAP)] = "mm", |
681 | [ilog2(VM_HUGEPAGE)] = "hg", | |
682 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
683 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
684 | [ilog2(VM_UFFD_MISSING)]= "um", |
685 | [ilog2(VM_UFFD_WP)] = "uw", | |
9f341931 CM |
686 | #ifdef CONFIG_ARM64_MTE |
687 | [ilog2(VM_MTE)] = "mt", | |
688 | [ilog2(VM_MTE_ALLOWED)] = "", | |
689 | #endif | |
5212213a | 690 | #ifdef CONFIG_ARCH_HAS_PKEYS |
c1192f84 DH |
691 | /* These come out via ProtectionKey: */ |
692 | [ilog2(VM_PKEY_BIT0)] = "", | |
693 | [ilog2(VM_PKEY_BIT1)] = "", | |
694 | [ilog2(VM_PKEY_BIT2)] = "", | |
695 | [ilog2(VM_PKEY_BIT3)] = "", | |
2c9e0a6f RP |
696 | #if VM_PKEY_BIT4 |
697 | [ilog2(VM_PKEY_BIT4)] = "", | |
c1192f84 | 698 | #endif |
5212213a | 699 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
7677f7fd AR |
700 | #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR |
701 | [ilog2(VM_UFFD_MINOR)] = "ui", | |
702 | #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
54007f81 YY |
703 | #ifdef CONFIG_X86_USER_SHADOW_STACK |
704 | [ilog2(VM_SHADOW_STACK)] = "ss", | |
705 | #endif | |
834f82e2 CG |
706 | }; |
707 | size_t i; | |
708 | ||
709 | seq_puts(m, "VmFlags: "); | |
710 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
711 | if (!mnemonics[i][0]) |
712 | continue; | |
834f82e2 | 713 | if (vma->vm_flags & (1UL << i)) { |
f6640663 AV |
714 | seq_putc(m, mnemonics[i][0]); |
715 | seq_putc(m, mnemonics[i][1]); | |
716 | seq_putc(m, ' '); | |
834f82e2 CG |
717 | } |
718 | } | |
719 | seq_putc(m, '\n'); | |
720 | } | |
721 | ||
25ee01a2 NH |
722 | #ifdef CONFIG_HUGETLB_PAGE |
723 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
724 | unsigned long addr, unsigned long end, | |
725 | struct mm_walk *walk) | |
726 | { | |
727 | struct mem_size_stats *mss = walk->private; | |
728 | struct vm_area_struct *vma = walk->vma; | |
729 | struct page *page = NULL; | |
c33c7948 | 730 | pte_t ptent = ptep_get(pte); |
25ee01a2 | 731 | |
c33c7948 RR |
732 | if (pte_present(ptent)) { |
733 | page = vm_normal_page(vma, addr, ptent); | |
734 | } else if (is_swap_pte(ptent)) { | |
735 | swp_entry_t swpent = pte_to_swp_entry(ptent); | |
25ee01a2 | 736 | |
af5cdaf8 AP |
737 | if (is_pfn_swap_entry(swpent)) |
738 | page = pfn_swap_entry_to_page(swpent); | |
25ee01a2 NH |
739 | } |
740 | if (page) { | |
3489dbb6 | 741 | if (page_mapcount(page) >= 2 || hugetlb_pmd_shared(pte)) |
25ee01a2 NH |
742 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); |
743 | else | |
744 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
745 | } | |
746 | return 0; | |
747 | } | |
7b86ac33 CH |
748 | #else |
749 | #define smaps_hugetlb_range NULL | |
25ee01a2 NH |
750 | #endif /* HUGETLB_PAGE */ |
751 | ||
7b86ac33 CH |
752 | static const struct mm_walk_ops smaps_walk_ops = { |
753 | .pmd_entry = smaps_pte_range, | |
754 | .hugetlb_entry = smaps_hugetlb_range, | |
49b06385 | 755 | .walk_lock = PGWALK_RDLOCK, |
7b86ac33 CH |
756 | }; |
757 | ||
758 | static const struct mm_walk_ops smaps_shmem_walk_ops = { | |
759 | .pmd_entry = smaps_pte_range, | |
760 | .hugetlb_entry = smaps_hugetlb_range, | |
761 | .pte_hole = smaps_pte_hole, | |
49b06385 | 762 | .walk_lock = PGWALK_RDLOCK, |
7b86ac33 CH |
763 | }; |
764 | ||
03b4b114 CC |
765 | /* |
766 | * Gather mem stats from @vma with the indicated beginning | |
767 | * address @start, and keep them in @mss. | |
768 | * | |
769 | * Use vm_start of @vma as the beginning address if @start is 0. | |
770 | */ | |
8e68d689 | 771 | static void smap_gather_stats(struct vm_area_struct *vma, |
03b4b114 | 772 | struct mem_size_stats *mss, unsigned long start) |
e070ad49 | 773 | { |
03b4b114 CC |
774 | const struct mm_walk_ops *ops = &smaps_walk_ops; |
775 | ||
776 | /* Invalid start */ | |
777 | if (start >= vma->vm_end) | |
778 | return; | |
779 | ||
c261e7d9 | 780 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { |
6a15a370 VB |
781 | /* |
782 | * For shared or readonly shmem mappings we know that all | |
783 | * swapped out pages belong to the shmem object, and we can | |
784 | * obtain the swap value much more efficiently. For private | |
785 | * writable mappings, we might have COW pages that are | |
786 | * not affected by the parent swapped out pages of the shmem | |
787 | * object, so we have to distinguish them during the page walk. | |
788 | * Unless we know that the shmem object (or the part mapped by | |
789 | * our VMA) has no swapped out pages at all. | |
790 | */ | |
791 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
792 | ||
03b4b114 CC |
793 | if (!start && (!shmem_swapped || (vma->vm_flags & VM_SHARED) || |
794 | !(vma->vm_flags & VM_WRITE))) { | |
fa76da46 | 795 | mss->swap += shmem_swapped; |
6a15a370 | 796 | } else { |
03b4b114 | 797 | ops = &smaps_shmem_walk_ops; |
6a15a370 | 798 | } |
c261e7d9 | 799 | } |
b4aca547 | 800 | |
c1e8d7c6 | 801 | /* mmap_lock is held in m_start */ |
03b4b114 CC |
802 | if (!start) |
803 | walk_page_vma(vma, ops, mss); | |
804 | else | |
805 | walk_page_range(vma->vm_mm, start, vma->vm_end, ops, mss); | |
8e68d689 VB |
806 | } |
807 | ||
808 | #define SEQ_PUT_DEC(str, val) \ | |
809 | seq_put_decimal_ull_width(m, str, (val) >> 10, 8) | |
f1547959 VB |
810 | |
811 | /* Show the contents common for smaps and smaps_rollup */ | |
ee2ad71b LS |
812 | static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss, |
813 | bool rollup_mode) | |
f1547959 VB |
814 | { |
815 | SEQ_PUT_DEC("Rss: ", mss->resident); | |
816 | SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT); | |
30934843 | 817 | SEQ_PUT_DEC(" kB\nPss_Dirty: ", mss->pss_dirty >> PSS_SHIFT); |
ee2ad71b LS |
818 | if (rollup_mode) { |
819 | /* | |
820 | * These are meaningful only for smaps_rollup, otherwise two of | |
821 | * them are zero, and the other one is the same as Pss. | |
822 | */ | |
823 | SEQ_PUT_DEC(" kB\nPss_Anon: ", | |
824 | mss->pss_anon >> PSS_SHIFT); | |
825 | SEQ_PUT_DEC(" kB\nPss_File: ", | |
826 | mss->pss_file >> PSS_SHIFT); | |
827 | SEQ_PUT_DEC(" kB\nPss_Shmem: ", | |
828 | mss->pss_shmem >> PSS_SHIFT); | |
829 | } | |
f1547959 VB |
830 | SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean); |
831 | SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty); | |
832 | SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean); | |
833 | SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty); | |
834 | SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced); | |
835 | SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous); | |
8b479335 | 836 | SEQ_PUT_DEC(" kB\nKSM: ", mss->ksm); |
f1547959 VB |
837 | SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree); |
838 | SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp); | |
839 | SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp); | |
471e78cc | 840 | SEQ_PUT_DEC(" kB\nFilePmdMapped: ", mss->file_thp); |
f1547959 VB |
841 | SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb); |
842 | seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ", | |
843 | mss->private_hugetlb >> 10, 7); | |
844 | SEQ_PUT_DEC(" kB\nSwap: ", mss->swap); | |
845 | SEQ_PUT_DEC(" kB\nSwapPss: ", | |
846 | mss->swap_pss >> PSS_SHIFT); | |
847 | SEQ_PUT_DEC(" kB\nLocked: ", | |
848 | mss->pss_locked >> PSS_SHIFT); | |
849 | seq_puts(m, " kB\n"); | |
850 | } | |
851 | ||
8e68d689 VB |
852 | static int show_smap(struct seq_file *m, void *v) |
853 | { | |
8e68d689 | 854 | struct vm_area_struct *vma = v; |
860a2e7f | 855 | struct mem_size_stats mss = {}; |
258f669e | 856 | |
03b4b114 | 857 | smap_gather_stats(vma, &mss, 0); |
258f669e VB |
858 | |
859 | show_map_vma(m, vma); | |
860 | ||
861 | SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); | |
862 | SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); | |
863 | SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); | |
864 | seq_puts(m, " kB\n"); | |
865 | ||
ee2ad71b | 866 | __show_smap(m, &mss, false); |
258f669e | 867 | |
daa60ae6 | 868 | seq_printf(m, "THPeligible: %8u\n", |
3485b883 RR |
869 | !!thp_vma_allowable_orders(vma, vma->vm_flags, true, false, |
870 | true, THP_ORDERS_ALL)); | |
7635d9cb | 871 | |
258f669e VB |
872 | if (arch_pkeys_enabled()) |
873 | seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); | |
874 | show_smap_vma_flags(m, vma); | |
875 | ||
258f669e VB |
876 | return 0; |
877 | } | |
878 | ||
879 | static int show_smaps_rollup(struct seq_file *m, void *v) | |
880 | { | |
881 | struct proc_maps_private *priv = m->private; | |
860a2e7f | 882 | struct mem_size_stats mss = {}; |
c4c84f06 | 883 | struct mm_struct *mm = priv->mm; |
258f669e | 884 | struct vm_area_struct *vma; |
c4c84f06 | 885 | unsigned long vma_start = 0, last_vma_end = 0; |
8e68d689 | 886 | int ret = 0; |
250cb40f | 887 | VMA_ITERATOR(vmi, mm, 0); |
8e68d689 | 888 | |
258f669e VB |
889 | priv->task = get_proc_task(priv->inode); |
890 | if (!priv->task) | |
891 | return -ESRCH; | |
493b0e9d | 892 | |
258f669e VB |
893 | if (!mm || !mmget_not_zero(mm)) { |
894 | ret = -ESRCH; | |
895 | goto out_put_task; | |
493b0e9d | 896 | } |
4752c369 | 897 | |
d8ed45c5 | 898 | ret = mmap_read_lock_killable(mm); |
a26a9781 KK |
899 | if (ret) |
900 | goto out_put_mm; | |
901 | ||
258f669e | 902 | hold_task_mempolicy(priv); |
250cb40f | 903 | vma = vma_next(&vmi); |
f1547959 | 904 | |
c4c84f06 MWO |
905 | if (unlikely(!vma)) |
906 | goto empty_set; | |
907 | ||
908 | vma_start = vma->vm_start; | |
909 | do { | |
03b4b114 | 910 | smap_gather_stats(vma, &mss, 0); |
258f669e | 911 | last_vma_end = vma->vm_end; |
ff9f47f6 CC |
912 | |
913 | /* | |
914 | * Release mmap_lock temporarily if someone wants to | |
915 | * access it for write request. | |
916 | */ | |
917 | if (mmap_lock_is_contended(mm)) { | |
250cb40f | 918 | vma_iter_invalidate(&vmi); |
ff9f47f6 CC |
919 | mmap_read_unlock(mm); |
920 | ret = mmap_read_lock_killable(mm); | |
921 | if (ret) { | |
922 | release_task_mempolicy(priv); | |
923 | goto out_put_mm; | |
924 | } | |
925 | ||
926 | /* | |
927 | * After dropping the lock, there are four cases to | |
928 | * consider. See the following example for explanation. | |
929 | * | |
930 | * +------+------+-----------+ | |
931 | * | VMA1 | VMA2 | VMA3 | | |
932 | * +------+------+-----------+ | |
933 | * | | | | | |
934 | * 4k 8k 16k 400k | |
935 | * | |
936 | * Suppose we drop the lock after reading VMA2 due to | |
937 | * contention, then we get: | |
938 | * | |
939 | * last_vma_end = 16k | |
940 | * | |
941 | * 1) VMA2 is freed, but VMA3 exists: | |
942 | * | |
250cb40f | 943 | * vma_next(vmi) will return VMA3. |
ff9f47f6 CC |
944 | * In this case, just continue from VMA3. |
945 | * | |
946 | * 2) VMA2 still exists: | |
947 | * | |
250cb40f LH |
948 | * vma_next(vmi) will return VMA3. |
949 | * In this case, just continue from VMA3. | |
ff9f47f6 CC |
950 | * |
951 | * 3) No more VMAs can be found: | |
952 | * | |
250cb40f | 953 | * vma_next(vmi) will return NULL. |
ff9f47f6 CC |
954 | * No more things to do, just break. |
955 | * | |
956 | * 4) (last_vma_end - 1) is the middle of a vma (VMA'): | |
957 | * | |
250cb40f | 958 | * vma_next(vmi) will return VMA' whose range |
ff9f47f6 CC |
959 | * contains last_vma_end. |
960 | * Iterate VMA' from last_vma_end. | |
961 | */ | |
250cb40f | 962 | vma = vma_next(&vmi); |
ff9f47f6 CC |
963 | /* Case 3 above */ |
964 | if (!vma) | |
965 | break; | |
966 | ||
250cb40f | 967 | /* Case 1 and 2 above */ |
ff9f47f6 CC |
968 | if (vma->vm_start >= last_vma_end) |
969 | continue; | |
970 | ||
971 | /* Case 4 above */ | |
972 | if (vma->vm_end > last_vma_end) | |
973 | smap_gather_stats(vma, &mss, last_vma_end); | |
974 | } | |
250cb40f | 975 | } for_each_vma(vmi, vma); |
258f669e | 976 | |
c4c84f06 MWO |
977 | empty_set: |
978 | show_vma_header_prefix(m, vma_start, last_vma_end, 0, 0, 0, 0); | |
258f669e VB |
979 | seq_pad(m, ' '); |
980 | seq_puts(m, "[rollup]\n"); | |
981 | ||
ee2ad71b | 982 | __show_smap(m, &mss, true); |
258f669e VB |
983 | |
984 | release_task_mempolicy(priv); | |
d8ed45c5 | 985 | mmap_read_unlock(mm); |
258f669e | 986 | |
a26a9781 KK |
987 | out_put_mm: |
988 | mmput(mm); | |
258f669e VB |
989 | out_put_task: |
990 | put_task_struct(priv->task); | |
991 | priv->task = NULL; | |
992 | ||
493b0e9d | 993 | return ret; |
e070ad49 | 994 | } |
d1be35cb | 995 | #undef SEQ_PUT_DEC |
e070ad49 | 996 | |
03a44825 | 997 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
998 | .start = m_start, |
999 | .next = m_next, | |
1000 | .stop = m_stop, | |
871305bb | 1001 | .show = show_smap |
a6198797 MM |
1002 | }; |
1003 | ||
b7643757 | 1004 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
1005 | { |
1006 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
1007 | } | |
1008 | ||
258f669e | 1009 | static int smaps_rollup_open(struct inode *inode, struct file *file) |
493b0e9d | 1010 | { |
258f669e | 1011 | int ret; |
493b0e9d | 1012 | struct proc_maps_private *priv; |
258f669e VB |
1013 | |
1014 | priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT); | |
1015 | if (!priv) | |
493b0e9d | 1016 | return -ENOMEM; |
258f669e VB |
1017 | |
1018 | ret = single_open(file, show_smaps_rollup, priv); | |
1019 | if (ret) | |
1020 | goto out_free; | |
1021 | ||
1022 | priv->inode = inode; | |
1023 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); | |
1024 | if (IS_ERR(priv->mm)) { | |
1025 | ret = PTR_ERR(priv->mm); | |
1026 | ||
1027 | single_release(inode, file); | |
1028 | goto out_free; | |
493b0e9d | 1029 | } |
258f669e | 1030 | |
493b0e9d | 1031 | return 0; |
258f669e VB |
1032 | |
1033 | out_free: | |
1034 | kfree(priv); | |
1035 | return ret; | |
1036 | } | |
1037 | ||
1038 | static int smaps_rollup_release(struct inode *inode, struct file *file) | |
1039 | { | |
1040 | struct seq_file *seq = file->private_data; | |
1041 | struct proc_maps_private *priv = seq->private; | |
1042 | ||
1043 | if (priv->mm) | |
1044 | mmdrop(priv->mm); | |
1045 | ||
1046 | kfree(priv); | |
1047 | return single_release(inode, file); | |
493b0e9d DC |
1048 | } |
1049 | ||
b7643757 SP |
1050 | const struct file_operations proc_pid_smaps_operations = { |
1051 | .open = pid_smaps_open, | |
1052 | .read = seq_read, | |
1053 | .llseek = seq_lseek, | |
29a40ace | 1054 | .release = proc_map_release, |
b7643757 SP |
1055 | }; |
1056 | ||
493b0e9d | 1057 | const struct file_operations proc_pid_smaps_rollup_operations = { |
258f669e | 1058 | .open = smaps_rollup_open, |
493b0e9d DC |
1059 | .read = seq_read, |
1060 | .llseek = seq_lseek, | |
258f669e | 1061 | .release = smaps_rollup_release, |
493b0e9d DC |
1062 | }; |
1063 | ||
040fa020 PE |
1064 | enum clear_refs_types { |
1065 | CLEAR_REFS_ALL = 1, | |
1066 | CLEAR_REFS_ANON, | |
1067 | CLEAR_REFS_MAPPED, | |
0f8975ec | 1068 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 1069 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
1070 | CLEAR_REFS_LAST, |
1071 | }; | |
1072 | ||
af9de7eb | 1073 | struct clear_refs_private { |
0f8975ec | 1074 | enum clear_refs_types type; |
af9de7eb PE |
1075 | }; |
1076 | ||
7d5b3bfa | 1077 | #ifdef CONFIG_MEM_SOFT_DIRTY |
9348b73c | 1078 | |
9348b73c LT |
1079 | static inline bool pte_is_pinned(struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
1080 | { | |
1081 | struct page *page; | |
1082 | ||
1083 | if (!pte_write(pte)) | |
1084 | return false; | |
1085 | if (!is_cow_mapping(vma->vm_flags)) | |
1086 | return false; | |
a458b76a | 1087 | if (likely(!test_bit(MMF_HAS_PINNED, &vma->vm_mm->flags))) |
9348b73c LT |
1088 | return false; |
1089 | page = vm_normal_page(vma, addr, pte); | |
1090 | if (!page) | |
1091 | return false; | |
1092 | return page_maybe_dma_pinned(page); | |
1093 | } | |
1094 | ||
0f8975ec PE |
1095 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
1096 | unsigned long addr, pte_t *pte) | |
1097 | { | |
0f8975ec PE |
1098 | /* |
1099 | * The soft-dirty tracker uses #PF-s to catch writes | |
1100 | * to pages, so write-protect the pte as well. See the | |
1ad1335d | 1101 | * Documentation/admin-guide/mm/soft-dirty.rst for full description |
0f8975ec PE |
1102 | * of how soft-dirty works. |
1103 | */ | |
c33c7948 | 1104 | pte_t ptent = ptep_get(pte); |
179ef71c CG |
1105 | |
1106 | if (pte_present(ptent)) { | |
04a86453 AK |
1107 | pte_t old_pte; |
1108 | ||
9348b73c LT |
1109 | if (pte_is_pinned(vma, addr, ptent)) |
1110 | return; | |
04a86453 AK |
1111 | old_pte = ptep_modify_prot_start(vma, addr, pte); |
1112 | ptent = pte_wrprotect(old_pte); | |
a7b76174 | 1113 | ptent = pte_clear_soft_dirty(ptent); |
04a86453 | 1114 | ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent); |
179ef71c CG |
1115 | } else if (is_swap_pte(ptent)) { |
1116 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 1117 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 1118 | } |
0f8975ec | 1119 | } |
5d3875a0 LD |
1120 | #else |
1121 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
1122 | unsigned long addr, pte_t *pte) | |
1123 | { | |
1124 | } | |
1125 | #endif | |
0f8975ec | 1126 | |
5d3875a0 | 1127 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
1128 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
1129 | unsigned long addr, pmd_t *pmdp) | |
1130 | { | |
a3cf988f | 1131 | pmd_t old, pmd = *pmdp; |
5b7abeae | 1132 | |
ab6e3d09 NH |
1133 | if (pmd_present(pmd)) { |
1134 | /* See comment in change_huge_pmd() */ | |
a3cf988f KS |
1135 | old = pmdp_invalidate(vma, addr, pmdp); |
1136 | if (pmd_dirty(old)) | |
ab6e3d09 | 1137 | pmd = pmd_mkdirty(pmd); |
a3cf988f | 1138 | if (pmd_young(old)) |
ab6e3d09 NH |
1139 | pmd = pmd_mkyoung(pmd); |
1140 | ||
1141 | pmd = pmd_wrprotect(pmd); | |
1142 | pmd = pmd_clear_soft_dirty(pmd); | |
1143 | ||
1144 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1145 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
1146 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
1147 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1148 | } | |
7d5b3bfa | 1149 | } |
7d5b3bfa | 1150 | #else |
7d5b3bfa KS |
1151 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
1152 | unsigned long addr, pmd_t *pmdp) | |
1153 | { | |
1154 | } | |
1155 | #endif | |
1156 | ||
a6198797 | 1157 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 1158 | unsigned long end, struct mm_walk *walk) |
a6198797 | 1159 | { |
af9de7eb | 1160 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 1161 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
1162 | pte_t *pte, ptent; |
1163 | spinlock_t *ptl; | |
1164 | struct page *page; | |
1165 | ||
b6ec57f4 KS |
1166 | ptl = pmd_trans_huge_lock(pmd, vma); |
1167 | if (ptl) { | |
7d5b3bfa KS |
1168 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1169 | clear_soft_dirty_pmd(vma, addr, pmd); | |
1170 | goto out; | |
1171 | } | |
1172 | ||
84c3fc4e ZY |
1173 | if (!pmd_present(*pmd)) |
1174 | goto out; | |
1175 | ||
7d5b3bfa KS |
1176 | page = pmd_page(*pmd); |
1177 | ||
1178 | /* Clear accessed and referenced bits. */ | |
1179 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 1180 | test_and_clear_page_young(page); |
7d5b3bfa KS |
1181 | ClearPageReferenced(page); |
1182 | out: | |
1183 | spin_unlock(ptl); | |
1184 | return 0; | |
1185 | } | |
1186 | ||
a6198797 | 1187 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
7780d040 HD |
1188 | if (!pte) { |
1189 | walk->action = ACTION_AGAIN; | |
1190 | return 0; | |
1191 | } | |
a6198797 | 1192 | for (; addr != end; pte++, addr += PAGE_SIZE) { |
c33c7948 | 1193 | ptent = ptep_get(pte); |
a6198797 | 1194 | |
0f8975ec PE |
1195 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1196 | clear_soft_dirty(vma, addr, pte); | |
1197 | continue; | |
1198 | } | |
1199 | ||
179ef71c CG |
1200 | if (!pte_present(ptent)) |
1201 | continue; | |
1202 | ||
a6198797 MM |
1203 | page = vm_normal_page(vma, addr, ptent); |
1204 | if (!page) | |
1205 | continue; | |
1206 | ||
1207 | /* Clear accessed and referenced bits. */ | |
1208 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 1209 | test_and_clear_page_young(page); |
a6198797 MM |
1210 | ClearPageReferenced(page); |
1211 | } | |
1212 | pte_unmap_unlock(pte - 1, ptl); | |
1213 | cond_resched(); | |
1214 | return 0; | |
1215 | } | |
1216 | ||
5c64f52a NH |
1217 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
1218 | struct mm_walk *walk) | |
1219 | { | |
1220 | struct clear_refs_private *cp = walk->private; | |
1221 | struct vm_area_struct *vma = walk->vma; | |
1222 | ||
48684a65 NH |
1223 | if (vma->vm_flags & VM_PFNMAP) |
1224 | return 1; | |
1225 | ||
5c64f52a NH |
1226 | /* |
1227 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
1228 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
1229 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
1230 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
1231 | */ | |
1232 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
1233 | return 1; | |
1234 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
1235 | return 1; | |
1236 | return 0; | |
1237 | } | |
1238 | ||
7b86ac33 CH |
1239 | static const struct mm_walk_ops clear_refs_walk_ops = { |
1240 | .pmd_entry = clear_refs_pte_range, | |
1241 | .test_walk = clear_refs_test_walk, | |
49b06385 | 1242 | .walk_lock = PGWALK_WRLOCK, |
7b86ac33 CH |
1243 | }; |
1244 | ||
f248dcb3 MM |
1245 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
1246 | size_t count, loff_t *ppos) | |
b813e931 | 1247 | { |
f248dcb3 | 1248 | struct task_struct *task; |
860a2e7f | 1249 | char buffer[PROC_NUMBUF] = {}; |
f248dcb3 | 1250 | struct mm_struct *mm; |
b813e931 | 1251 | struct vm_area_struct *vma; |
040fa020 PE |
1252 | enum clear_refs_types type; |
1253 | int itype; | |
0a8cb8e3 | 1254 | int rv; |
b813e931 | 1255 | |
f248dcb3 MM |
1256 | if (count > sizeof(buffer) - 1) |
1257 | count = sizeof(buffer) - 1; | |
1258 | if (copy_from_user(buffer, buf, count)) | |
1259 | return -EFAULT; | |
040fa020 | 1260 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1261 | if (rv < 0) |
1262 | return rv; | |
040fa020 PE |
1263 | type = (enum clear_refs_types)itype; |
1264 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1265 | return -EINVAL; |
541c237c | 1266 | |
496ad9aa | 1267 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1268 | if (!task) |
1269 | return -ESRCH; | |
1270 | mm = get_task_mm(task); | |
1271 | if (mm) { | |
250cb40f | 1272 | VMA_ITERATOR(vmi, mm, 0); |
ac46d4f3 | 1273 | struct mmu_notifier_range range; |
af9de7eb | 1274 | struct clear_refs_private cp = { |
0f8975ec | 1275 | .type = type, |
af9de7eb | 1276 | }; |
695f0559 | 1277 | |
29a951df LT |
1278 | if (mmap_write_lock_killable(mm)) { |
1279 | count = -EINTR; | |
1280 | goto out_mm; | |
1281 | } | |
695f0559 PC |
1282 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { |
1283 | /* | |
1284 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1285 | * resident set size to this mm's current rss value. | |
1286 | */ | |
695f0559 | 1287 | reset_mm_hiwater_rss(mm); |
29a951df | 1288 | goto out_unlock; |
695f0559 PC |
1289 | } |
1290 | ||
64e45507 | 1291 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
250cb40f | 1292 | for_each_vma(vmi, vma) { |
64e45507 PF |
1293 | if (!(vma->vm_flags & VM_SOFTDIRTY)) |
1294 | continue; | |
1c71222e | 1295 | vm_flags_clear(vma, VM_SOFTDIRTY); |
29a951df | 1296 | vma_set_page_prot(vma); |
64e45507 | 1297 | } |
ac46d4f3 | 1298 | |
912efa17 | 1299 | inc_tlb_flush_pending(mm); |
7269f999 | 1300 | mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY, |
7d4a8be0 | 1301 | 0, mm, 0, -1UL); |
ac46d4f3 | 1302 | mmu_notifier_invalidate_range_start(&range); |
64e45507 | 1303 | } |
c4c84f06 | 1304 | walk_page_range(mm, 0, -1, &clear_refs_walk_ops, &cp); |
912efa17 | 1305 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
ac46d4f3 | 1306 | mmu_notifier_invalidate_range_end(&range); |
912efa17 WD |
1307 | flush_tlb_mm(mm); |
1308 | dec_tlb_flush_pending(mm); | |
1309 | } | |
29a951df LT |
1310 | out_unlock: |
1311 | mmap_write_unlock(mm); | |
695f0559 | 1312 | out_mm: |
f248dcb3 MM |
1313 | mmput(mm); |
1314 | } | |
1315 | put_task_struct(task); | |
fb92a4b0 VL |
1316 | |
1317 | return count; | |
b813e931 DR |
1318 | } |
1319 | ||
f248dcb3 MM |
1320 | const struct file_operations proc_clear_refs_operations = { |
1321 | .write = clear_refs_write, | |
6038f373 | 1322 | .llseek = noop_llseek, |
f248dcb3 MM |
1323 | }; |
1324 | ||
092b50ba NH |
1325 | typedef struct { |
1326 | u64 pme; | |
1327 | } pagemap_entry_t; | |
1328 | ||
85863e47 | 1329 | struct pagemapread { |
8c829622 | 1330 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1331 | pagemap_entry_t *buffer; |
1c90308e | 1332 | bool show_pfn; |
85863e47 MM |
1333 | }; |
1334 | ||
5aaabe83 NH |
1335 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1336 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1337 | ||
deb94544 KK |
1338 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1339 | #define PM_PFRAME_BITS 55 | |
1340 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1341 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1342 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
fb8e37f3 | 1343 | #define PM_UFFD_WP BIT_ULL(57) |
deb94544 KK |
1344 | #define PM_FILE BIT_ULL(61) |
1345 | #define PM_SWAP BIT_ULL(62) | |
1346 | #define PM_PRESENT BIT_ULL(63) | |
1347 | ||
85863e47 MM |
1348 | #define PM_END_OF_BUFFER 1 |
1349 | ||
deb94544 | 1350 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1351 | { |
deb94544 | 1352 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1353 | } |
1354 | ||
1355 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1356 | struct pagemapread *pm) |
1357 | { | |
092b50ba | 1358 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1359 | if (pm->pos >= pm->len) |
aae8679b | 1360 | return PM_END_OF_BUFFER; |
85863e47 MM |
1361 | return 0; |
1362 | } | |
1363 | ||
1364 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
b7a16c7a | 1365 | __always_unused int depth, struct mm_walk *walk) |
85863e47 | 1366 | { |
2165009b | 1367 | struct pagemapread *pm = walk->private; |
68b5a652 | 1368 | unsigned long addr = start; |
85863e47 | 1369 | int err = 0; |
092b50ba | 1370 | |
68b5a652 PF |
1371 | while (addr < end) { |
1372 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1373 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1374 | /* End of address space hole, which we mark as non-present. */ |
1375 | unsigned long hole_end; | |
68b5a652 | 1376 | |
87e6d49a PF |
1377 | if (vma) |
1378 | hole_end = min(end, vma->vm_start); | |
1379 | else | |
1380 | hole_end = end; | |
1381 | ||
1382 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1383 | err = add_to_pagemap(addr, &pme, pm); | |
1384 | if (err) | |
1385 | goto out; | |
68b5a652 PF |
1386 | } |
1387 | ||
87e6d49a PF |
1388 | if (!vma) |
1389 | break; | |
1390 | ||
1391 | /* Addresses in the VMA. */ | |
1392 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1393 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1394 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1395 | err = add_to_pagemap(addr, &pme, pm); |
1396 | if (err) | |
1397 | goto out; | |
1398 | } | |
85863e47 | 1399 | } |
68b5a652 | 1400 | out: |
85863e47 MM |
1401 | return err; |
1402 | } | |
1403 | ||
deb94544 | 1404 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1405 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1406 | { |
deb94544 | 1407 | u64 frame = 0, flags = 0; |
052fb0d6 | 1408 | struct page *page = NULL; |
24d7275c | 1409 | bool migration = false; |
85863e47 | 1410 | |
052fb0d6 | 1411 | if (pte_present(pte)) { |
1c90308e KK |
1412 | if (pm->show_pfn) |
1413 | frame = pte_pfn(pte); | |
deb94544 | 1414 | flags |= PM_PRESENT; |
25b2995a | 1415 | page = vm_normal_page(vma, addr, pte); |
e9cdd6e7 | 1416 | if (pte_soft_dirty(pte)) |
deb94544 | 1417 | flags |= PM_SOFT_DIRTY; |
fb8e37f3 PX |
1418 | if (pte_uffd_wp(pte)) |
1419 | flags |= PM_UFFD_WP; | |
052fb0d6 | 1420 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1421 | swp_entry_t entry; |
1422 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1423 | flags |= PM_SOFT_DIRTY; |
fb8e37f3 PX |
1424 | if (pte_swp_uffd_wp(pte)) |
1425 | flags |= PM_UFFD_WP; | |
179ef71c | 1426 | entry = pte_to_swp_entry(pte); |
0d206b5d PX |
1427 | if (pm->show_pfn) { |
1428 | pgoff_t offset; | |
1429 | /* | |
1430 | * For PFN swap offsets, keeping the offset field | |
1431 | * to be PFN only to be compatible with old smaps. | |
1432 | */ | |
1433 | if (is_pfn_swap_entry(entry)) | |
1434 | offset = swp_offset_pfn(entry); | |
1435 | else | |
1436 | offset = swp_offset(entry); | |
ab6ecf24 | 1437 | frame = swp_type(entry) | |
0d206b5d PX |
1438 | (offset << MAX_SWAPFILES_SHIFT); |
1439 | } | |
deb94544 | 1440 | flags |= PM_SWAP; |
24d7275c | 1441 | migration = is_migration_entry(entry); |
af5cdaf8 AP |
1442 | if (is_pfn_swap_entry(entry)) |
1443 | page = pfn_swap_entry_to_page(entry); | |
8e165e73 PX |
1444 | if (pte_marker_entry_uffd_wp(entry)) |
1445 | flags |= PM_UFFD_WP; | |
052fb0d6 KK |
1446 | } |
1447 | ||
1448 | if (page && !PageAnon(page)) | |
1449 | flags |= PM_FILE; | |
24d7275c | 1450 | if (page && !migration && page_mapcount(page) == 1) |
77bb499b | 1451 | flags |= PM_MMAP_EXCLUSIVE; |
deb94544 KK |
1452 | if (vma->vm_flags & VM_SOFTDIRTY) |
1453 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1454 | |
deb94544 | 1455 | return make_pme(frame, flags); |
bcf8039e DH |
1456 | } |
1457 | ||
356515e7 | 1458 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1459 | struct mm_walk *walk) |
85863e47 | 1460 | { |
f995ece2 | 1461 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1462 | struct pagemapread *pm = walk->private; |
bf929152 | 1463 | spinlock_t *ptl; |
05fbf357 | 1464 | pte_t *pte, *orig_pte; |
85863e47 | 1465 | int err = 0; |
356515e7 | 1466 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
24d7275c YS |
1467 | bool migration = false; |
1468 | ||
b6ec57f4 KS |
1469 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1470 | if (ptl) { | |
356515e7 KK |
1471 | u64 flags = 0, frame = 0; |
1472 | pmd_t pmd = *pmdp; | |
84c3fc4e | 1473 | struct page *page = NULL; |
0f8975ec | 1474 | |
b83d7e43 | 1475 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1476 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1477 | |
356515e7 | 1478 | if (pmd_present(pmd)) { |
84c3fc4e | 1479 | page = pmd_page(pmd); |
77bb499b | 1480 | |
356515e7 | 1481 | flags |= PM_PRESENT; |
b83d7e43 HY |
1482 | if (pmd_soft_dirty(pmd)) |
1483 | flags |= PM_SOFT_DIRTY; | |
fb8e37f3 PX |
1484 | if (pmd_uffd_wp(pmd)) |
1485 | flags |= PM_UFFD_WP; | |
1c90308e KK |
1486 | if (pm->show_pfn) |
1487 | frame = pmd_pfn(pmd) + | |
1488 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 | 1489 | } |
84c3fc4e ZY |
1490 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
1491 | else if (is_swap_pmd(pmd)) { | |
1492 | swp_entry_t entry = pmd_to_swp_entry(pmd); | |
ab6ecf24 | 1493 | unsigned long offset; |
84c3fc4e | 1494 | |
ab6ecf24 | 1495 | if (pm->show_pfn) { |
0d206b5d PX |
1496 | if (is_pfn_swap_entry(entry)) |
1497 | offset = swp_offset_pfn(entry); | |
1498 | else | |
1499 | offset = swp_offset(entry); | |
1500 | offset = offset + | |
ab6ecf24 HY |
1501 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); |
1502 | frame = swp_type(entry) | | |
1503 | (offset << MAX_SWAPFILES_SHIFT); | |
1504 | } | |
84c3fc4e | 1505 | flags |= PM_SWAP; |
b83d7e43 HY |
1506 | if (pmd_swp_soft_dirty(pmd)) |
1507 | flags |= PM_SOFT_DIRTY; | |
fb8e37f3 PX |
1508 | if (pmd_swp_uffd_wp(pmd)) |
1509 | flags |= PM_UFFD_WP; | |
84c3fc4e | 1510 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); |
24d7275c | 1511 | migration = is_migration_entry(entry); |
af5cdaf8 | 1512 | page = pfn_swap_entry_to_page(entry); |
84c3fc4e ZY |
1513 | } |
1514 | #endif | |
1515 | ||
24d7275c | 1516 | if (page && !migration && page_mapcount(page) == 1) |
84c3fc4e | 1517 | flags |= PM_MMAP_EXCLUSIVE; |
356515e7 | 1518 | |
025c5b24 | 1519 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1520 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1521 | |
092b50ba | 1522 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1523 | if (err) |
1524 | break; | |
ab6ecf24 HY |
1525 | if (pm->show_pfn) { |
1526 | if (flags & PM_PRESENT) | |
1527 | frame++; | |
1528 | else if (flags & PM_SWAP) | |
1529 | frame += (1 << MAX_SWAPFILES_SHIFT); | |
1530 | } | |
5aaabe83 | 1531 | } |
bf929152 | 1532 | spin_unlock(ptl); |
025c5b24 | 1533 | return err; |
5aaabe83 | 1534 | } |
356515e7 | 1535 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1536 | |
f995ece2 NH |
1537 | /* |
1538 | * We can assume that @vma always points to a valid one and @end never | |
1539 | * goes beyond vma->vm_end. | |
1540 | */ | |
356515e7 | 1541 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
7780d040 HD |
1542 | if (!pte) { |
1543 | walk->action = ACTION_AGAIN; | |
1544 | return err; | |
1545 | } | |
f995ece2 NH |
1546 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1547 | pagemap_entry_t pme; | |
05fbf357 | 1548 | |
c33c7948 | 1549 | pme = pte_to_pagemap_entry(pm, vma, addr, ptep_get(pte)); |
f995ece2 | 1550 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1551 | if (err) |
81d0fa62 | 1552 | break; |
85863e47 | 1553 | } |
f995ece2 | 1554 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1555 | |
1556 | cond_resched(); | |
1557 | ||
1558 | return err; | |
1559 | } | |
1560 | ||
1a5cb814 | 1561 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1562 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1563 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1564 | unsigned long addr, unsigned long end, |
1565 | struct mm_walk *walk) | |
5dc37642 | 1566 | { |
5dc37642 | 1567 | struct pagemapread *pm = walk->private; |
f995ece2 | 1568 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1569 | u64 flags = 0, frame = 0; |
5dc37642 | 1570 | int err = 0; |
356515e7 | 1571 | pte_t pte; |
5dc37642 | 1572 | |
f995ece2 | 1573 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1574 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1575 | |
356515e7 KK |
1576 | pte = huge_ptep_get(ptep); |
1577 | if (pte_present(pte)) { | |
1578 | struct page *page = pte_page(pte); | |
1579 | ||
1580 | if (!PageAnon(page)) | |
1581 | flags |= PM_FILE; | |
1582 | ||
77bb499b KK |
1583 | if (page_mapcount(page) == 1) |
1584 | flags |= PM_MMAP_EXCLUSIVE; | |
1585 | ||
8e165e73 PX |
1586 | if (huge_pte_uffd_wp(pte)) |
1587 | flags |= PM_UFFD_WP; | |
1588 | ||
356515e7 | 1589 | flags |= PM_PRESENT; |
1c90308e KK |
1590 | if (pm->show_pfn) |
1591 | frame = pte_pfn(pte) + | |
1592 | ((addr & ~hmask) >> PAGE_SHIFT); | |
8e165e73 PX |
1593 | } else if (pte_swp_uffd_wp_any(pte)) { |
1594 | flags |= PM_UFFD_WP; | |
356515e7 KK |
1595 | } |
1596 | ||
5dc37642 | 1597 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1598 | pagemap_entry_t pme = make_pme(frame, flags); |
1599 | ||
092b50ba | 1600 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1601 | if (err) |
1602 | return err; | |
1c90308e | 1603 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1604 | frame++; |
5dc37642 NH |
1605 | } |
1606 | ||
1607 | cond_resched(); | |
1608 | ||
1609 | return err; | |
1610 | } | |
7b86ac33 CH |
1611 | #else |
1612 | #define pagemap_hugetlb_range NULL | |
1a5cb814 | 1613 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1614 | |
7b86ac33 CH |
1615 | static const struct mm_walk_ops pagemap_ops = { |
1616 | .pmd_entry = pagemap_pmd_range, | |
1617 | .pte_hole = pagemap_pte_hole, | |
1618 | .hugetlb_entry = pagemap_hugetlb_range, | |
49b06385 | 1619 | .walk_lock = PGWALK_RDLOCK, |
7b86ac33 CH |
1620 | }; |
1621 | ||
85863e47 MM |
1622 | /* |
1623 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1624 | * | |
f16278c6 HR |
1625 | * For each page in the address space, this file contains one 64-bit entry |
1626 | * consisting of the following: | |
1627 | * | |
052fb0d6 | 1628 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1629 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1630 | * Bits 5-54 swap offset if swapped |
1ad1335d | 1631 | * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst) |
77bb499b | 1632 | * Bit 56 page exclusively mapped |
dd21bfa4 YZ |
1633 | * Bit 57 pte is uffd-wp write-protected |
1634 | * Bits 58-60 zero | |
052fb0d6 | 1635 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1636 | * Bit 62 page swapped |
1637 | * Bit 63 page present | |
1638 | * | |
1639 | * If the page is not present but in swap, then the PFN contains an | |
1640 | * encoding of the swap file number and the page's offset into the | |
1641 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1642 | * precisely which pages are mapped (or in swap) and comparing mapped |
1643 | * pages between processes. | |
1644 | * | |
1645 | * Efficient users of this interface will use /proc/pid/maps to | |
1646 | * determine which areas of memory are actually mapped and llseek to | |
1647 | * skip over unmapped regions. | |
1648 | */ | |
1649 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1650 | size_t count, loff_t *ppos) | |
1651 | { | |
a06db751 | 1652 | struct mm_struct *mm = file->private_data; |
85863e47 | 1653 | struct pagemapread pm; |
5d7e0d2b AM |
1654 | unsigned long src; |
1655 | unsigned long svpfn; | |
1656 | unsigned long start_vaddr; | |
1657 | unsigned long end_vaddr; | |
a06db751 | 1658 | int ret = 0, copied = 0; |
85863e47 | 1659 | |
388f7934 | 1660 | if (!mm || !mmget_not_zero(mm)) |
85863e47 MM |
1661 | goto out; |
1662 | ||
85863e47 MM |
1663 | ret = -EINVAL; |
1664 | /* file position must be aligned */ | |
aae8679b | 1665 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1666 | goto out_mm; |
85863e47 MM |
1667 | |
1668 | ret = 0; | |
08161786 | 1669 | if (!count) |
a06db751 | 1670 | goto out_mm; |
08161786 | 1671 | |
1c90308e KK |
1672 | /* do not disclose physical addresses: attack vector */ |
1673 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1674 | ||
8c829622 | 1675 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
6da2ec56 | 1676 | pm.buffer = kmalloc_array(pm.len, PM_ENTRY_BYTES, GFP_KERNEL); |
5d7e0d2b | 1677 | ret = -ENOMEM; |
d82ef020 | 1678 | if (!pm.buffer) |
a06db751 | 1679 | goto out_mm; |
85863e47 | 1680 | |
5d7e0d2b AM |
1681 | src = *ppos; |
1682 | svpfn = src / PM_ENTRY_BYTES; | |
a06db751 | 1683 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1684 | |
1685 | /* watch out for wraparound */ | |
40d6366e | 1686 | start_vaddr = end_vaddr; |
428e106a | 1687 | if (svpfn <= (ULONG_MAX >> PAGE_SHIFT)) { |
7bab8dfb YX |
1688 | unsigned long end; |
1689 | ||
428e106a KS |
1690 | ret = mmap_read_lock_killable(mm); |
1691 | if (ret) | |
1692 | goto out_free; | |
1693 | start_vaddr = untagged_addr_remote(mm, svpfn << PAGE_SHIFT); | |
1694 | mmap_read_unlock(mm); | |
7bab8dfb YX |
1695 | |
1696 | end = start_vaddr + ((count / PM_ENTRY_BYTES) << PAGE_SHIFT); | |
1697 | if (end >= start_vaddr && end < mm->task_size) | |
1698 | end_vaddr = end; | |
428e106a | 1699 | } |
40d6366e MC |
1700 | |
1701 | /* Ensure the address is inside the task */ | |
1702 | if (start_vaddr > mm->task_size) | |
5d7e0d2b AM |
1703 | start_vaddr = end_vaddr; |
1704 | ||
d82ef020 KH |
1705 | ret = 0; |
1706 | while (count && (start_vaddr < end_vaddr)) { | |
1707 | int len; | |
1708 | unsigned long end; | |
1709 | ||
1710 | pm.pos = 0; | |
ea251c1d | 1711 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1712 | /* overflow ? */ |
1713 | if (end < start_vaddr || end > end_vaddr) | |
1714 | end = end_vaddr; | |
d8ed45c5 | 1715 | ret = mmap_read_lock_killable(mm); |
ad80b932 KK |
1716 | if (ret) |
1717 | goto out_free; | |
7b86ac33 | 1718 | ret = walk_page_range(mm, start_vaddr, end, &pagemap_ops, &pm); |
d8ed45c5 | 1719 | mmap_read_unlock(mm); |
d82ef020 KH |
1720 | start_vaddr = end; |
1721 | ||
1722 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1723 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1724 | ret = -EFAULT; |
a06db751 | 1725 | goto out_free; |
d82ef020 KH |
1726 | } |
1727 | copied += len; | |
1728 | buf += len; | |
1729 | count -= len; | |
85863e47 | 1730 | } |
d82ef020 KH |
1731 | *ppos += copied; |
1732 | if (!ret || ret == PM_END_OF_BUFFER) | |
1733 | ret = copied; | |
1734 | ||
98bc93e5 KM |
1735 | out_free: |
1736 | kfree(pm.buffer); | |
a06db751 KK |
1737 | out_mm: |
1738 | mmput(mm); | |
85863e47 MM |
1739 | out: |
1740 | return ret; | |
1741 | } | |
1742 | ||
541c237c PE |
1743 | static int pagemap_open(struct inode *inode, struct file *file) |
1744 | { | |
a06db751 KK |
1745 | struct mm_struct *mm; |
1746 | ||
a06db751 KK |
1747 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1748 | if (IS_ERR(mm)) | |
1749 | return PTR_ERR(mm); | |
1750 | file->private_data = mm; | |
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | static int pagemap_release(struct inode *inode, struct file *file) | |
1755 | { | |
1756 | struct mm_struct *mm = file->private_data; | |
1757 | ||
1758 | if (mm) | |
1759 | mmdrop(mm); | |
541c237c PE |
1760 | return 0; |
1761 | } | |
1762 | ||
52526ca7 MUA |
1763 | #define PM_SCAN_CATEGORIES (PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN | \ |
1764 | PAGE_IS_FILE | PAGE_IS_PRESENT | \ | |
1765 | PAGE_IS_SWAPPED | PAGE_IS_PFNZERO | \ | |
e6a9a2cb | 1766 | PAGE_IS_HUGE | PAGE_IS_SOFT_DIRTY) |
52526ca7 MUA |
1767 | #define PM_SCAN_FLAGS (PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC) |
1768 | ||
1769 | struct pagemap_scan_private { | |
1770 | struct pm_scan_arg arg; | |
1771 | unsigned long masks_of_interest, cur_vma_category; | |
1772 | struct page_region *vec_buf; | |
1773 | unsigned long vec_buf_len, vec_buf_index, found_pages; | |
1774 | struct page_region __user *vec_out; | |
1775 | }; | |
1776 | ||
1777 | static unsigned long pagemap_page_category(struct pagemap_scan_private *p, | |
1778 | struct vm_area_struct *vma, | |
1779 | unsigned long addr, pte_t pte) | |
1780 | { | |
1781 | unsigned long categories = 0; | |
1782 | ||
1783 | if (pte_present(pte)) { | |
1784 | struct page *page; | |
1785 | ||
1786 | categories |= PAGE_IS_PRESENT; | |
1787 | if (!pte_uffd_wp(pte)) | |
1788 | categories |= PAGE_IS_WRITTEN; | |
1789 | ||
1790 | if (p->masks_of_interest & PAGE_IS_FILE) { | |
1791 | page = vm_normal_page(vma, addr, pte); | |
1792 | if (page && !PageAnon(page)) | |
1793 | categories |= PAGE_IS_FILE; | |
1794 | } | |
1795 | ||
1796 | if (is_zero_pfn(pte_pfn(pte))) | |
1797 | categories |= PAGE_IS_PFNZERO; | |
e6a9a2cb AV |
1798 | if (pte_soft_dirty(pte)) |
1799 | categories |= PAGE_IS_SOFT_DIRTY; | |
52526ca7 MUA |
1800 | } else if (is_swap_pte(pte)) { |
1801 | swp_entry_t swp; | |
1802 | ||
1803 | categories |= PAGE_IS_SWAPPED; | |
1804 | if (!pte_swp_uffd_wp_any(pte)) | |
1805 | categories |= PAGE_IS_WRITTEN; | |
1806 | ||
1807 | if (p->masks_of_interest & PAGE_IS_FILE) { | |
1808 | swp = pte_to_swp_entry(pte); | |
1809 | if (is_pfn_swap_entry(swp) && | |
1810 | !PageAnon(pfn_swap_entry_to_page(swp))) | |
1811 | categories |= PAGE_IS_FILE; | |
1812 | } | |
e6a9a2cb AV |
1813 | if (pte_swp_soft_dirty(pte)) |
1814 | categories |= PAGE_IS_SOFT_DIRTY; | |
52526ca7 MUA |
1815 | } |
1816 | ||
1817 | return categories; | |
1818 | } | |
1819 | ||
1820 | static void make_uffd_wp_pte(struct vm_area_struct *vma, | |
1821 | unsigned long addr, pte_t *pte) | |
1822 | { | |
1823 | pte_t ptent = ptep_get(pte); | |
1824 | ||
1825 | if (pte_present(ptent)) { | |
1826 | pte_t old_pte; | |
1827 | ||
1828 | old_pte = ptep_modify_prot_start(vma, addr, pte); | |
1829 | ptent = pte_mkuffd_wp(ptent); | |
1830 | ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent); | |
1831 | } else if (is_swap_pte(ptent)) { | |
1832 | ptent = pte_swp_mkuffd_wp(ptent); | |
1833 | set_pte_at(vma->vm_mm, addr, pte, ptent); | |
1834 | } else { | |
1835 | set_pte_at(vma->vm_mm, addr, pte, | |
1836 | make_pte_marker(PTE_MARKER_UFFD_WP)); | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1841 | static unsigned long pagemap_thp_category(struct pagemap_scan_private *p, | |
1842 | struct vm_area_struct *vma, | |
1843 | unsigned long addr, pmd_t pmd) | |
1844 | { | |
1845 | unsigned long categories = PAGE_IS_HUGE; | |
1846 | ||
1847 | if (pmd_present(pmd)) { | |
1848 | struct page *page; | |
1849 | ||
1850 | categories |= PAGE_IS_PRESENT; | |
1851 | if (!pmd_uffd_wp(pmd)) | |
1852 | categories |= PAGE_IS_WRITTEN; | |
1853 | ||
1854 | if (p->masks_of_interest & PAGE_IS_FILE) { | |
1855 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1856 | if (page && !PageAnon(page)) | |
1857 | categories |= PAGE_IS_FILE; | |
1858 | } | |
1859 | ||
1860 | if (is_zero_pfn(pmd_pfn(pmd))) | |
1861 | categories |= PAGE_IS_PFNZERO; | |
e6a9a2cb AV |
1862 | if (pmd_soft_dirty(pmd)) |
1863 | categories |= PAGE_IS_SOFT_DIRTY; | |
52526ca7 MUA |
1864 | } else if (is_swap_pmd(pmd)) { |
1865 | swp_entry_t swp; | |
1866 | ||
1867 | categories |= PAGE_IS_SWAPPED; | |
1868 | if (!pmd_swp_uffd_wp(pmd)) | |
1869 | categories |= PAGE_IS_WRITTEN; | |
e6a9a2cb AV |
1870 | if (pmd_swp_soft_dirty(pmd)) |
1871 | categories |= PAGE_IS_SOFT_DIRTY; | |
52526ca7 MUA |
1872 | |
1873 | if (p->masks_of_interest & PAGE_IS_FILE) { | |
1874 | swp = pmd_to_swp_entry(pmd); | |
1875 | if (is_pfn_swap_entry(swp) && | |
1876 | !PageAnon(pfn_swap_entry_to_page(swp))) | |
1877 | categories |= PAGE_IS_FILE; | |
1878 | } | |
1879 | } | |
1880 | ||
1881 | return categories; | |
1882 | } | |
1883 | ||
1884 | static void make_uffd_wp_pmd(struct vm_area_struct *vma, | |
1885 | unsigned long addr, pmd_t *pmdp) | |
1886 | { | |
1887 | pmd_t old, pmd = *pmdp; | |
1888 | ||
1889 | if (pmd_present(pmd)) { | |
1890 | old = pmdp_invalidate_ad(vma, addr, pmdp); | |
1891 | pmd = pmd_mkuffd_wp(old); | |
1892 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1893 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
1894 | pmd = pmd_swp_mkuffd_wp(pmd); | |
1895 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1896 | } | |
1897 | } | |
1898 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1899 | ||
1900 | #ifdef CONFIG_HUGETLB_PAGE | |
1901 | static unsigned long pagemap_hugetlb_category(pte_t pte) | |
1902 | { | |
1903 | unsigned long categories = PAGE_IS_HUGE; | |
1904 | ||
1905 | /* | |
1906 | * According to pagemap_hugetlb_range(), file-backed HugeTLB | |
1907 | * page cannot be swapped. So PAGE_IS_FILE is not checked for | |
1908 | * swapped pages. | |
1909 | */ | |
1910 | if (pte_present(pte)) { | |
1911 | categories |= PAGE_IS_PRESENT; | |
1912 | if (!huge_pte_uffd_wp(pte)) | |
1913 | categories |= PAGE_IS_WRITTEN; | |
1914 | if (!PageAnon(pte_page(pte))) | |
1915 | categories |= PAGE_IS_FILE; | |
1916 | if (is_zero_pfn(pte_pfn(pte))) | |
1917 | categories |= PAGE_IS_PFNZERO; | |
e6a9a2cb AV |
1918 | if (pte_soft_dirty(pte)) |
1919 | categories |= PAGE_IS_SOFT_DIRTY; | |
52526ca7 MUA |
1920 | } else if (is_swap_pte(pte)) { |
1921 | categories |= PAGE_IS_SWAPPED; | |
1922 | if (!pte_swp_uffd_wp_any(pte)) | |
1923 | categories |= PAGE_IS_WRITTEN; | |
e6a9a2cb AV |
1924 | if (pte_swp_soft_dirty(pte)) |
1925 | categories |= PAGE_IS_SOFT_DIRTY; | |
52526ca7 MUA |
1926 | } |
1927 | ||
1928 | return categories; | |
1929 | } | |
1930 | ||
1931 | static void make_uffd_wp_huge_pte(struct vm_area_struct *vma, | |
1932 | unsigned long addr, pte_t *ptep, | |
1933 | pte_t ptent) | |
1934 | { | |
1935 | unsigned long psize; | |
1936 | ||
1937 | if (is_hugetlb_entry_hwpoisoned(ptent) || is_pte_marker(ptent)) | |
1938 | return; | |
1939 | ||
1940 | psize = huge_page_size(hstate_vma(vma)); | |
1941 | ||
1942 | if (is_hugetlb_entry_migration(ptent)) | |
1943 | set_huge_pte_at(vma->vm_mm, addr, ptep, | |
1944 | pte_swp_mkuffd_wp(ptent), psize); | |
1945 | else if (!huge_pte_none(ptent)) | |
1946 | huge_ptep_modify_prot_commit(vma, addr, ptep, ptent, | |
1947 | huge_pte_mkuffd_wp(ptent)); | |
1948 | else | |
1949 | set_huge_pte_at(vma->vm_mm, addr, ptep, | |
1950 | make_pte_marker(PTE_MARKER_UFFD_WP), psize); | |
1951 | } | |
1952 | #endif /* CONFIG_HUGETLB_PAGE */ | |
1953 | ||
1954 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE) | |
1955 | static void pagemap_scan_backout_range(struct pagemap_scan_private *p, | |
1956 | unsigned long addr, unsigned long end) | |
1957 | { | |
1958 | struct page_region *cur_buf = &p->vec_buf[p->vec_buf_index]; | |
1959 | ||
1960 | if (cur_buf->start != addr) | |
1961 | cur_buf->end = addr; | |
1962 | else | |
1963 | cur_buf->start = cur_buf->end = 0; | |
1964 | ||
1965 | p->found_pages -= (end - addr) / PAGE_SIZE; | |
1966 | } | |
1967 | #endif | |
1968 | ||
1969 | static bool pagemap_scan_is_interesting_page(unsigned long categories, | |
1970 | const struct pagemap_scan_private *p) | |
1971 | { | |
1972 | categories ^= p->arg.category_inverted; | |
1973 | if ((categories & p->arg.category_mask) != p->arg.category_mask) | |
1974 | return false; | |
1975 | if (p->arg.category_anyof_mask && !(categories & p->arg.category_anyof_mask)) | |
1976 | return false; | |
1977 | ||
1978 | return true; | |
1979 | } | |
1980 | ||
1981 | static bool pagemap_scan_is_interesting_vma(unsigned long categories, | |
1982 | const struct pagemap_scan_private *p) | |
1983 | { | |
1984 | unsigned long required = p->arg.category_mask & PAGE_IS_WPALLOWED; | |
1985 | ||
1986 | categories ^= p->arg.category_inverted; | |
1987 | if ((categories & required) != required) | |
1988 | return false; | |
1989 | ||
1990 | return true; | |
1991 | } | |
1992 | ||
1993 | static int pagemap_scan_test_walk(unsigned long start, unsigned long end, | |
1994 | struct mm_walk *walk) | |
1995 | { | |
1996 | struct pagemap_scan_private *p = walk->private; | |
1997 | struct vm_area_struct *vma = walk->vma; | |
1998 | unsigned long vma_category = 0; | |
0dff1b40 PX |
1999 | bool wp_allowed = userfaultfd_wp_async(vma) && |
2000 | userfaultfd_wp_use_markers(vma); | |
52526ca7 | 2001 | |
0dff1b40 PX |
2002 | if (!wp_allowed) { |
2003 | /* User requested explicit failure over wp-async capability */ | |
2004 | if (p->arg.flags & PM_SCAN_CHECK_WPASYNC) | |
2005 | return -EPERM; | |
2006 | /* | |
2007 | * User requires wr-protect, and allows silently skipping | |
2008 | * unsupported vmas. | |
2009 | */ | |
2010 | if (p->arg.flags & PM_SCAN_WP_MATCHING) | |
2011 | return 1; | |
2012 | /* | |
2013 | * Then the request doesn't involve wr-protects at all, | |
2014 | * fall through to the rest checks, and allow vma walk. | |
2015 | */ | |
2016 | } | |
52526ca7 MUA |
2017 | |
2018 | if (vma->vm_flags & VM_PFNMAP) | |
2019 | return 1; | |
2020 | ||
0dff1b40 PX |
2021 | if (wp_allowed) |
2022 | vma_category |= PAGE_IS_WPALLOWED; | |
2023 | ||
e6a9a2cb AV |
2024 | if (vma->vm_flags & VM_SOFTDIRTY) |
2025 | vma_category |= PAGE_IS_SOFT_DIRTY; | |
2026 | ||
52526ca7 MUA |
2027 | if (!pagemap_scan_is_interesting_vma(vma_category, p)) |
2028 | return 1; | |
2029 | ||
2030 | p->cur_vma_category = vma_category; | |
2031 | ||
2032 | return 0; | |
2033 | } | |
2034 | ||
2035 | static bool pagemap_scan_push_range(unsigned long categories, | |
2036 | struct pagemap_scan_private *p, | |
2037 | unsigned long addr, unsigned long end) | |
2038 | { | |
2039 | struct page_region *cur_buf = &p->vec_buf[p->vec_buf_index]; | |
2040 | ||
2041 | /* | |
2042 | * When there is no output buffer provided at all, the sentinel values | |
2043 | * won't match here. There is no other way for `cur_buf->end` to be | |
2044 | * non-zero other than it being non-empty. | |
2045 | */ | |
2046 | if (addr == cur_buf->end && categories == cur_buf->categories) { | |
2047 | cur_buf->end = end; | |
2048 | return true; | |
2049 | } | |
2050 | ||
2051 | if (cur_buf->end) { | |
2052 | if (p->vec_buf_index >= p->vec_buf_len - 1) | |
2053 | return false; | |
2054 | ||
2055 | cur_buf = &p->vec_buf[++p->vec_buf_index]; | |
2056 | } | |
2057 | ||
2058 | cur_buf->start = addr; | |
2059 | cur_buf->end = end; | |
2060 | cur_buf->categories = categories; | |
2061 | ||
2062 | return true; | |
2063 | } | |
2064 | ||
2065 | static int pagemap_scan_output(unsigned long categories, | |
2066 | struct pagemap_scan_private *p, | |
2067 | unsigned long addr, unsigned long *end) | |
2068 | { | |
2069 | unsigned long n_pages, total_pages; | |
2070 | int ret = 0; | |
2071 | ||
2072 | if (!p->vec_buf) | |
2073 | return 0; | |
2074 | ||
2075 | categories &= p->arg.return_mask; | |
2076 | ||
2077 | n_pages = (*end - addr) / PAGE_SIZE; | |
2078 | if (check_add_overflow(p->found_pages, n_pages, &total_pages) || | |
2079 | total_pages > p->arg.max_pages) { | |
2080 | size_t n_too_much = total_pages - p->arg.max_pages; | |
2081 | *end -= n_too_much * PAGE_SIZE; | |
2082 | n_pages -= n_too_much; | |
2083 | ret = -ENOSPC; | |
2084 | } | |
2085 | ||
2086 | if (!pagemap_scan_push_range(categories, p, addr, *end)) { | |
2087 | *end = addr; | |
2088 | n_pages = 0; | |
2089 | ret = -ENOSPC; | |
2090 | } | |
2091 | ||
2092 | p->found_pages += n_pages; | |
2093 | if (ret) | |
2094 | p->arg.walk_end = *end; | |
2095 | ||
2096 | return ret; | |
2097 | } | |
2098 | ||
2099 | static int pagemap_scan_thp_entry(pmd_t *pmd, unsigned long start, | |
2100 | unsigned long end, struct mm_walk *walk) | |
2101 | { | |
2102 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
2103 | struct pagemap_scan_private *p = walk->private; | |
2104 | struct vm_area_struct *vma = walk->vma; | |
2105 | unsigned long categories; | |
2106 | spinlock_t *ptl; | |
2107 | int ret = 0; | |
2108 | ||
2109 | ptl = pmd_trans_huge_lock(pmd, vma); | |
2110 | if (!ptl) | |
2111 | return -ENOENT; | |
2112 | ||
2113 | categories = p->cur_vma_category | | |
2114 | pagemap_thp_category(p, vma, start, *pmd); | |
2115 | ||
2116 | if (!pagemap_scan_is_interesting_page(categories, p)) | |
2117 | goto out_unlock; | |
2118 | ||
2119 | ret = pagemap_scan_output(categories, p, start, &end); | |
2120 | if (start == end) | |
2121 | goto out_unlock; | |
2122 | ||
2123 | if (~p->arg.flags & PM_SCAN_WP_MATCHING) | |
2124 | goto out_unlock; | |
2125 | if (~categories & PAGE_IS_WRITTEN) | |
2126 | goto out_unlock; | |
2127 | ||
2128 | /* | |
2129 | * Break huge page into small pages if the WP operation | |
2130 | * needs to be performed on a portion of the huge page. | |
2131 | */ | |
2132 | if (end != start + HPAGE_SIZE) { | |
2133 | spin_unlock(ptl); | |
2134 | split_huge_pmd(vma, pmd, start); | |
2135 | pagemap_scan_backout_range(p, start, end); | |
2136 | /* Report as if there was no THP */ | |
2137 | return -ENOENT; | |
2138 | } | |
2139 | ||
2140 | make_uffd_wp_pmd(vma, start, pmd); | |
2141 | flush_tlb_range(vma, start, end); | |
2142 | out_unlock: | |
2143 | spin_unlock(ptl); | |
2144 | return ret; | |
2145 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
2146 | return -ENOENT; | |
2147 | #endif | |
2148 | } | |
2149 | ||
2150 | static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start, | |
2151 | unsigned long end, struct mm_walk *walk) | |
2152 | { | |
2153 | struct pagemap_scan_private *p = walk->private; | |
2154 | struct vm_area_struct *vma = walk->vma; | |
2155 | unsigned long addr, flush_end = 0; | |
2156 | pte_t *pte, *start_pte; | |
2157 | spinlock_t *ptl; | |
2158 | int ret; | |
2159 | ||
2160 | arch_enter_lazy_mmu_mode(); | |
2161 | ||
2162 | ret = pagemap_scan_thp_entry(pmd, start, end, walk); | |
2163 | if (ret != -ENOENT) { | |
2164 | arch_leave_lazy_mmu_mode(); | |
2165 | return ret; | |
2166 | } | |
2167 | ||
2168 | ret = 0; | |
2169 | start_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, start, &ptl); | |
2170 | if (!pte) { | |
2171 | arch_leave_lazy_mmu_mode(); | |
2172 | walk->action = ACTION_AGAIN; | |
2173 | return 0; | |
2174 | } | |
2175 | ||
4980e837 | 2176 | if ((p->arg.flags & PM_SCAN_WP_MATCHING) && !p->vec_out) { |
12f6b01a MUA |
2177 | /* Fast path for performing exclusive WP */ |
2178 | for (addr = start; addr != end; pte++, addr += PAGE_SIZE) { | |
2179 | if (pte_uffd_wp(ptep_get(pte))) | |
2180 | continue; | |
2181 | make_uffd_wp_pte(vma, addr, pte); | |
2182 | if (!flush_end) | |
2183 | start = addr; | |
2184 | flush_end = addr + PAGE_SIZE; | |
2185 | } | |
2186 | goto flush_and_return; | |
2187 | } | |
2188 | ||
2189 | if (!p->arg.category_anyof_mask && !p->arg.category_inverted && | |
2190 | p->arg.category_mask == PAGE_IS_WRITTEN && | |
2191 | p->arg.return_mask == PAGE_IS_WRITTEN) { | |
2192 | for (addr = start; addr < end; pte++, addr += PAGE_SIZE) { | |
2193 | unsigned long next = addr + PAGE_SIZE; | |
2194 | ||
2195 | if (pte_uffd_wp(ptep_get(pte))) | |
2196 | continue; | |
2197 | ret = pagemap_scan_output(p->cur_vma_category | PAGE_IS_WRITTEN, | |
2198 | p, addr, &next); | |
2199 | if (next == addr) | |
2200 | break; | |
2201 | if (~p->arg.flags & PM_SCAN_WP_MATCHING) | |
2202 | continue; | |
2203 | make_uffd_wp_pte(vma, addr, pte); | |
2204 | if (!flush_end) | |
2205 | start = addr; | |
2206 | flush_end = next; | |
2207 | } | |
2208 | goto flush_and_return; | |
2209 | } | |
2210 | ||
52526ca7 MUA |
2211 | for (addr = start; addr != end; pte++, addr += PAGE_SIZE) { |
2212 | unsigned long categories = p->cur_vma_category | | |
2213 | pagemap_page_category(p, vma, addr, ptep_get(pte)); | |
2214 | unsigned long next = addr + PAGE_SIZE; | |
2215 | ||
2216 | if (!pagemap_scan_is_interesting_page(categories, p)) | |
2217 | continue; | |
2218 | ||
2219 | ret = pagemap_scan_output(categories, p, addr, &next); | |
2220 | if (next == addr) | |
2221 | break; | |
2222 | ||
2223 | if (~p->arg.flags & PM_SCAN_WP_MATCHING) | |
2224 | continue; | |
2225 | if (~categories & PAGE_IS_WRITTEN) | |
2226 | continue; | |
2227 | ||
2228 | make_uffd_wp_pte(vma, addr, pte); | |
2229 | if (!flush_end) | |
2230 | start = addr; | |
2231 | flush_end = next; | |
2232 | } | |
2233 | ||
12f6b01a | 2234 | flush_and_return: |
52526ca7 MUA |
2235 | if (flush_end) |
2236 | flush_tlb_range(vma, start, addr); | |
2237 | ||
2238 | pte_unmap_unlock(start_pte, ptl); | |
2239 | arch_leave_lazy_mmu_mode(); | |
2240 | ||
2241 | cond_resched(); | |
2242 | return ret; | |
2243 | } | |
2244 | ||
2245 | #ifdef CONFIG_HUGETLB_PAGE | |
2246 | static int pagemap_scan_hugetlb_entry(pte_t *ptep, unsigned long hmask, | |
2247 | unsigned long start, unsigned long end, | |
2248 | struct mm_walk *walk) | |
2249 | { | |
2250 | struct pagemap_scan_private *p = walk->private; | |
2251 | struct vm_area_struct *vma = walk->vma; | |
2252 | unsigned long categories; | |
2253 | spinlock_t *ptl; | |
2254 | int ret = 0; | |
2255 | pte_t pte; | |
2256 | ||
2257 | if (~p->arg.flags & PM_SCAN_WP_MATCHING) { | |
2258 | /* Go the short route when not write-protecting pages. */ | |
2259 | ||
2260 | pte = huge_ptep_get(ptep); | |
2261 | categories = p->cur_vma_category | pagemap_hugetlb_category(pte); | |
2262 | ||
2263 | if (!pagemap_scan_is_interesting_page(categories, p)) | |
2264 | return 0; | |
2265 | ||
2266 | return pagemap_scan_output(categories, p, start, &end); | |
2267 | } | |
2268 | ||
2269 | i_mmap_lock_write(vma->vm_file->f_mapping); | |
2270 | ptl = huge_pte_lock(hstate_vma(vma), vma->vm_mm, ptep); | |
2271 | ||
2272 | pte = huge_ptep_get(ptep); | |
2273 | categories = p->cur_vma_category | pagemap_hugetlb_category(pte); | |
2274 | ||
2275 | if (!pagemap_scan_is_interesting_page(categories, p)) | |
2276 | goto out_unlock; | |
2277 | ||
2278 | ret = pagemap_scan_output(categories, p, start, &end); | |
2279 | if (start == end) | |
2280 | goto out_unlock; | |
2281 | ||
2282 | if (~categories & PAGE_IS_WRITTEN) | |
2283 | goto out_unlock; | |
2284 | ||
2285 | if (end != start + HPAGE_SIZE) { | |
2286 | /* Partial HugeTLB page WP isn't possible. */ | |
2287 | pagemap_scan_backout_range(p, start, end); | |
2288 | p->arg.walk_end = start; | |
2289 | ret = 0; | |
2290 | goto out_unlock; | |
2291 | } | |
2292 | ||
2293 | make_uffd_wp_huge_pte(vma, start, ptep, pte); | |
2294 | flush_hugetlb_tlb_range(vma, start, end); | |
2295 | ||
2296 | out_unlock: | |
2297 | spin_unlock(ptl); | |
2298 | i_mmap_unlock_write(vma->vm_file->f_mapping); | |
2299 | ||
2300 | return ret; | |
2301 | } | |
2302 | #else | |
2303 | #define pagemap_scan_hugetlb_entry NULL | |
2304 | #endif | |
2305 | ||
2306 | static int pagemap_scan_pte_hole(unsigned long addr, unsigned long end, | |
2307 | int depth, struct mm_walk *walk) | |
2308 | { | |
2309 | struct pagemap_scan_private *p = walk->private; | |
2310 | struct vm_area_struct *vma = walk->vma; | |
2311 | int ret, err; | |
2312 | ||
2313 | if (!vma || !pagemap_scan_is_interesting_page(p->cur_vma_category, p)) | |
2314 | return 0; | |
2315 | ||
2316 | ret = pagemap_scan_output(p->cur_vma_category, p, addr, &end); | |
2317 | if (addr == end) | |
2318 | return ret; | |
2319 | ||
2320 | if (~p->arg.flags & PM_SCAN_WP_MATCHING) | |
2321 | return ret; | |
2322 | ||
2323 | err = uffd_wp_range(vma, addr, end - addr, true); | |
2324 | if (err < 0) | |
2325 | ret = err; | |
2326 | ||
2327 | return ret; | |
2328 | } | |
2329 | ||
2330 | static const struct mm_walk_ops pagemap_scan_ops = { | |
2331 | .test_walk = pagemap_scan_test_walk, | |
2332 | .pmd_entry = pagemap_scan_pmd_entry, | |
2333 | .pte_hole = pagemap_scan_pte_hole, | |
2334 | .hugetlb_entry = pagemap_scan_hugetlb_entry, | |
2335 | }; | |
2336 | ||
2337 | static int pagemap_scan_get_args(struct pm_scan_arg *arg, | |
2338 | unsigned long uarg) | |
2339 | { | |
2340 | if (copy_from_user(arg, (void __user *)uarg, sizeof(*arg))) | |
2341 | return -EFAULT; | |
2342 | ||
2343 | if (arg->size != sizeof(struct pm_scan_arg)) | |
2344 | return -EINVAL; | |
2345 | ||
2346 | /* Validate requested features */ | |
2347 | if (arg->flags & ~PM_SCAN_FLAGS) | |
2348 | return -EINVAL; | |
2349 | if ((arg->category_inverted | arg->category_mask | | |
2350 | arg->category_anyof_mask | arg->return_mask) & ~PM_SCAN_CATEGORIES) | |
2351 | return -EINVAL; | |
2352 | ||
2353 | arg->start = untagged_addr((unsigned long)arg->start); | |
2354 | arg->end = untagged_addr((unsigned long)arg->end); | |
2355 | arg->vec = untagged_addr((unsigned long)arg->vec); | |
2356 | ||
2357 | /* Validate memory pointers */ | |
2358 | if (!IS_ALIGNED(arg->start, PAGE_SIZE)) | |
2359 | return -EINVAL; | |
2360 | if (!access_ok((void __user *)(long)arg->start, arg->end - arg->start)) | |
2361 | return -EFAULT; | |
2362 | if (!arg->vec && arg->vec_len) | |
2363 | return -EINVAL; | |
2364 | if (arg->vec && !access_ok((void __user *)(long)arg->vec, | |
2365 | arg->vec_len * sizeof(struct page_region))) | |
2366 | return -EFAULT; | |
2367 | ||
2368 | /* Fixup default values */ | |
2369 | arg->end = ALIGN(arg->end, PAGE_SIZE); | |
2370 | arg->walk_end = 0; | |
2371 | if (!arg->max_pages) | |
2372 | arg->max_pages = ULONG_MAX; | |
2373 | ||
2374 | return 0; | |
2375 | } | |
2376 | ||
2377 | static int pagemap_scan_writeback_args(struct pm_scan_arg *arg, | |
2378 | unsigned long uargl) | |
2379 | { | |
2380 | struct pm_scan_arg __user *uarg = (void __user *)uargl; | |
2381 | ||
2382 | if (copy_to_user(&uarg->walk_end, &arg->walk_end, sizeof(arg->walk_end))) | |
2383 | return -EFAULT; | |
2384 | ||
2385 | return 0; | |
2386 | } | |
2387 | ||
2388 | static int pagemap_scan_init_bounce_buffer(struct pagemap_scan_private *p) | |
2389 | { | |
2390 | if (!p->arg.vec_len) | |
2391 | return 0; | |
2392 | ||
2393 | p->vec_buf_len = min_t(size_t, PAGEMAP_WALK_SIZE >> PAGE_SHIFT, | |
2394 | p->arg.vec_len); | |
2395 | p->vec_buf = kmalloc_array(p->vec_buf_len, sizeof(*p->vec_buf), | |
2396 | GFP_KERNEL); | |
2397 | if (!p->vec_buf) | |
2398 | return -ENOMEM; | |
2399 | ||
2400 | p->vec_buf->start = p->vec_buf->end = 0; | |
2401 | p->vec_out = (struct page_region __user *)(long)p->arg.vec; | |
2402 | ||
2403 | return 0; | |
2404 | } | |
2405 | ||
2406 | static long pagemap_scan_flush_buffer(struct pagemap_scan_private *p) | |
2407 | { | |
2408 | const struct page_region *buf = p->vec_buf; | |
2409 | long n = p->vec_buf_index; | |
2410 | ||
2411 | if (!p->vec_buf) | |
2412 | return 0; | |
2413 | ||
2414 | if (buf[n].end != buf[n].start) | |
2415 | n++; | |
2416 | ||
2417 | if (!n) | |
2418 | return 0; | |
2419 | ||
2420 | if (copy_to_user(p->vec_out, buf, n * sizeof(*buf))) | |
2421 | return -EFAULT; | |
2422 | ||
2423 | p->arg.vec_len -= n; | |
2424 | p->vec_out += n; | |
2425 | ||
2426 | p->vec_buf_index = 0; | |
2427 | p->vec_buf_len = min_t(size_t, p->vec_buf_len, p->arg.vec_len); | |
2428 | p->vec_buf->start = p->vec_buf->end = 0; | |
2429 | ||
2430 | return n; | |
2431 | } | |
2432 | ||
2433 | static long do_pagemap_scan(struct mm_struct *mm, unsigned long uarg) | |
2434 | { | |
52526ca7 MUA |
2435 | struct pagemap_scan_private p = {0}; |
2436 | unsigned long walk_start; | |
2437 | size_t n_ranges_out = 0; | |
2438 | int ret; | |
2439 | ||
2440 | ret = pagemap_scan_get_args(&p.arg, uarg); | |
2441 | if (ret) | |
2442 | return ret; | |
2443 | ||
2444 | p.masks_of_interest = p.arg.category_mask | p.arg.category_anyof_mask | | |
2445 | p.arg.return_mask; | |
2446 | ret = pagemap_scan_init_bounce_buffer(&p); | |
2447 | if (ret) | |
2448 | return ret; | |
2449 | ||
52526ca7 MUA |
2450 | for (walk_start = p.arg.start; walk_start < p.arg.end; |
2451 | walk_start = p.arg.walk_end) { | |
4cccb622 | 2452 | struct mmu_notifier_range range; |
52526ca7 MUA |
2453 | long n_out; |
2454 | ||
2455 | if (fatal_signal_pending(current)) { | |
2456 | ret = -EINTR; | |
2457 | break; | |
2458 | } | |
2459 | ||
2460 | ret = mmap_read_lock_killable(mm); | |
2461 | if (ret) | |
2462 | break; | |
4cccb622 MUA |
2463 | |
2464 | /* Protection change for the range is going to happen. */ | |
2465 | if (p.arg.flags & PM_SCAN_WP_MATCHING) { | |
2466 | mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA, 0, | |
2467 | mm, walk_start, p.arg.end); | |
2468 | mmu_notifier_invalidate_range_start(&range); | |
2469 | } | |
2470 | ||
52526ca7 MUA |
2471 | ret = walk_page_range(mm, walk_start, p.arg.end, |
2472 | &pagemap_scan_ops, &p); | |
4cccb622 MUA |
2473 | |
2474 | if (p.arg.flags & PM_SCAN_WP_MATCHING) | |
2475 | mmu_notifier_invalidate_range_end(&range); | |
2476 | ||
52526ca7 MUA |
2477 | mmap_read_unlock(mm); |
2478 | ||
2479 | n_out = pagemap_scan_flush_buffer(&p); | |
2480 | if (n_out < 0) | |
2481 | ret = n_out; | |
2482 | else | |
2483 | n_ranges_out += n_out; | |
2484 | ||
2485 | if (ret != -ENOSPC) | |
2486 | break; | |
2487 | ||
2488 | if (p.arg.vec_len == 0 || p.found_pages == p.arg.max_pages) | |
2489 | break; | |
2490 | } | |
2491 | ||
2492 | /* ENOSPC signifies early stop (buffer full) from the walk. */ | |
2493 | if (!ret || ret == -ENOSPC) | |
2494 | ret = n_ranges_out; | |
2495 | ||
2496 | /* The walk_end isn't set when ret is zero */ | |
2497 | if (!p.arg.walk_end) | |
2498 | p.arg.walk_end = p.arg.end; | |
2499 | if (pagemap_scan_writeback_args(&p.arg, uarg)) | |
2500 | ret = -EFAULT; | |
2501 | ||
52526ca7 MUA |
2502 | kfree(p.vec_buf); |
2503 | return ret; | |
2504 | } | |
2505 | ||
2506 | static long do_pagemap_cmd(struct file *file, unsigned int cmd, | |
2507 | unsigned long arg) | |
2508 | { | |
2509 | struct mm_struct *mm = file->private_data; | |
2510 | ||
2511 | switch (cmd) { | |
2512 | case PAGEMAP_SCAN: | |
2513 | return do_pagemap_scan(mm, arg); | |
2514 | ||
2515 | default: | |
2516 | return -EINVAL; | |
2517 | } | |
2518 | } | |
2519 | ||
85863e47 MM |
2520 | const struct file_operations proc_pagemap_operations = { |
2521 | .llseek = mem_lseek, /* borrow this */ | |
2522 | .read = pagemap_read, | |
541c237c | 2523 | .open = pagemap_open, |
a06db751 | 2524 | .release = pagemap_release, |
52526ca7 MUA |
2525 | .unlocked_ioctl = do_pagemap_cmd, |
2526 | .compat_ioctl = do_pagemap_cmd, | |
85863e47 | 2527 | }; |
1e883281 | 2528 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 2529 | |
6e21c8f1 | 2530 | #ifdef CONFIG_NUMA |
6e21c8f1 | 2531 | |
f69ff943 | 2532 | struct numa_maps { |
f69ff943 SW |
2533 | unsigned long pages; |
2534 | unsigned long anon; | |
2535 | unsigned long active; | |
2536 | unsigned long writeback; | |
2537 | unsigned long mapcount_max; | |
2538 | unsigned long dirty; | |
2539 | unsigned long swapcache; | |
2540 | unsigned long node[MAX_NUMNODES]; | |
2541 | }; | |
2542 | ||
5b52fc89 SW |
2543 | struct numa_maps_private { |
2544 | struct proc_maps_private proc_maps; | |
2545 | struct numa_maps md; | |
2546 | }; | |
2547 | ||
eb4866d0 DH |
2548 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
2549 | unsigned long nr_pages) | |
f69ff943 SW |
2550 | { |
2551 | int count = page_mapcount(page); | |
2552 | ||
eb4866d0 | 2553 | md->pages += nr_pages; |
f69ff943 | 2554 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 2555 | md->dirty += nr_pages; |
f69ff943 SW |
2556 | |
2557 | if (PageSwapCache(page)) | |
eb4866d0 | 2558 | md->swapcache += nr_pages; |
f69ff943 SW |
2559 | |
2560 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 2561 | md->active += nr_pages; |
f69ff943 SW |
2562 | |
2563 | if (PageWriteback(page)) | |
eb4866d0 | 2564 | md->writeback += nr_pages; |
f69ff943 SW |
2565 | |
2566 | if (PageAnon(page)) | |
eb4866d0 | 2567 | md->anon += nr_pages; |
f69ff943 SW |
2568 | |
2569 | if (count > md->mapcount_max) | |
2570 | md->mapcount_max = count; | |
2571 | ||
eb4866d0 | 2572 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
2573 | } |
2574 | ||
3200a8aa DH |
2575 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
2576 | unsigned long addr) | |
2577 | { | |
2578 | struct page *page; | |
2579 | int nid; | |
2580 | ||
2581 | if (!pte_present(pte)) | |
2582 | return NULL; | |
2583 | ||
2584 | page = vm_normal_page(vma, addr, pte); | |
3218f871 | 2585 | if (!page || is_zone_device_page(page)) |
3200a8aa DH |
2586 | return NULL; |
2587 | ||
2588 | if (PageReserved(page)) | |
2589 | return NULL; | |
2590 | ||
2591 | nid = page_to_nid(page); | |
4ff1b2c2 | 2592 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
2593 | return NULL; |
2594 | ||
2595 | return page; | |
2596 | } | |
2597 | ||
28093f9f GS |
2598 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
2599 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
2600 | struct vm_area_struct *vma, | |
2601 | unsigned long addr) | |
2602 | { | |
2603 | struct page *page; | |
2604 | int nid; | |
2605 | ||
2606 | if (!pmd_present(pmd)) | |
2607 | return NULL; | |
2608 | ||
2609 | page = vm_normal_page_pmd(vma, addr, pmd); | |
2610 | if (!page) | |
2611 | return NULL; | |
2612 | ||
2613 | if (PageReserved(page)) | |
2614 | return NULL; | |
2615 | ||
2616 | nid = page_to_nid(page); | |
2617 | if (!node_isset(nid, node_states[N_MEMORY])) | |
2618 | return NULL; | |
2619 | ||
2620 | return page; | |
2621 | } | |
2622 | #endif | |
2623 | ||
f69ff943 SW |
2624 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
2625 | unsigned long end, struct mm_walk *walk) | |
2626 | { | |
d85f4d6d NH |
2627 | struct numa_maps *md = walk->private; |
2628 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
2629 | spinlock_t *ptl; |
2630 | pte_t *orig_pte; | |
2631 | pte_t *pte; | |
2632 | ||
28093f9f | 2633 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
2634 | ptl = pmd_trans_huge_lock(pmd, vma); |
2635 | if (ptl) { | |
025c5b24 NH |
2636 | struct page *page; |
2637 | ||
28093f9f | 2638 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 2639 | if (page) |
28093f9f | 2640 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 2641 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 2642 | spin_unlock(ptl); |
025c5b24 | 2643 | return 0; |
32ef4384 | 2644 | } |
28093f9f | 2645 | #endif |
f69ff943 | 2646 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
7780d040 HD |
2647 | if (!pte) { |
2648 | walk->action = ACTION_AGAIN; | |
2649 | return 0; | |
2650 | } | |
f69ff943 | 2651 | do { |
c33c7948 RR |
2652 | pte_t ptent = ptep_get(pte); |
2653 | struct page *page = can_gather_numa_stats(ptent, vma, addr); | |
f69ff943 SW |
2654 | if (!page) |
2655 | continue; | |
c33c7948 | 2656 | gather_stats(page, md, pte_dirty(ptent), 1); |
f69ff943 SW |
2657 | |
2658 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
2659 | pte_unmap_unlock(orig_pte, ptl); | |
a66c0410 | 2660 | cond_resched(); |
f69ff943 SW |
2661 | return 0; |
2662 | } | |
2663 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 2664 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
2665 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
2666 | { | |
5c2ff95e | 2667 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
2668 | struct numa_maps *md; |
2669 | struct page *page; | |
2670 | ||
5c2ff95e | 2671 | if (!pte_present(huge_pte)) |
f69ff943 SW |
2672 | return 0; |
2673 | ||
5c2ff95e | 2674 | page = pte_page(huge_pte); |
f69ff943 SW |
2675 | |
2676 | md = walk->private; | |
5c2ff95e | 2677 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
2678 | return 0; |
2679 | } | |
2680 | ||
2681 | #else | |
632fd60f | 2682 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
2683 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
2684 | { | |
2685 | return 0; | |
2686 | } | |
2687 | #endif | |
2688 | ||
7b86ac33 CH |
2689 | static const struct mm_walk_ops show_numa_ops = { |
2690 | .hugetlb_entry = gather_hugetlb_stats, | |
2691 | .pmd_entry = gather_pte_stats, | |
49b06385 | 2692 | .walk_lock = PGWALK_RDLOCK, |
7b86ac33 CH |
2693 | }; |
2694 | ||
f69ff943 SW |
2695 | /* |
2696 | * Display pages allocated per node and memory policy via /proc. | |
2697 | */ | |
871305bb | 2698 | static int show_numa_map(struct seq_file *m, void *v) |
f69ff943 | 2699 | { |
5b52fc89 SW |
2700 | struct numa_maps_private *numa_priv = m->private; |
2701 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 2702 | struct vm_area_struct *vma = v; |
5b52fc89 | 2703 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
2704 | struct file *file = vma->vm_file; |
2705 | struct mm_struct *mm = vma->vm_mm; | |
948927ee | 2706 | char buffer[64]; |
ddc1a5cb HD |
2707 | struct mempolicy *pol; |
2708 | pgoff_t ilx; | |
948927ee | 2709 | int nid; |
f69ff943 SW |
2710 | |
2711 | if (!mm) | |
2712 | return 0; | |
2713 | ||
5b52fc89 SW |
2714 | /* Ensure we start with an empty set of numa_maps statistics. */ |
2715 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 2716 | |
ddc1a5cb | 2717 | pol = __get_vma_policy(vma, vma->vm_start, &ilx); |
498f2371 ON |
2718 | if (pol) { |
2719 | mpol_to_str(buffer, sizeof(buffer), pol); | |
2720 | mpol_cond_put(pol); | |
2721 | } else { | |
2722 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
2723 | } | |
f69ff943 SW |
2724 | |
2725 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
2726 | ||
2727 | if (file) { | |
17c2b4ee | 2728 | seq_puts(m, " file="); |
08582d67 | 2729 | seq_path(m, file_user_path(file), "\n\t= "); |
11250fd1 | 2730 | } else if (vma_is_initial_heap(vma)) { |
17c2b4ee | 2731 | seq_puts(m, " heap"); |
11250fd1 | 2732 | } else if (vma_is_initial_stack(vma)) { |
65376df5 | 2733 | seq_puts(m, " stack"); |
f69ff943 SW |
2734 | } |
2735 | ||
fc360bd9 | 2736 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 2737 | seq_puts(m, " huge"); |
fc360bd9 | 2738 | |
c1e8d7c6 | 2739 | /* mmap_lock is held by m_start */ |
7b86ac33 | 2740 | walk_page_vma(vma, &show_numa_ops, md); |
f69ff943 SW |
2741 | |
2742 | if (!md->pages) | |
2743 | goto out; | |
2744 | ||
2745 | if (md->anon) | |
2746 | seq_printf(m, " anon=%lu", md->anon); | |
2747 | ||
2748 | if (md->dirty) | |
2749 | seq_printf(m, " dirty=%lu", md->dirty); | |
2750 | ||
2751 | if (md->pages != md->anon && md->pages != md->dirty) | |
2752 | seq_printf(m, " mapped=%lu", md->pages); | |
2753 | ||
2754 | if (md->mapcount_max > 1) | |
2755 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
2756 | ||
2757 | if (md->swapcache) | |
2758 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
2759 | ||
2760 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
2761 | seq_printf(m, " active=%lu", md->active); | |
2762 | ||
2763 | if (md->writeback) | |
2764 | seq_printf(m, " writeback=%lu", md->writeback); | |
2765 | ||
948927ee DR |
2766 | for_each_node_state(nid, N_MEMORY) |
2767 | if (md->node[nid]) | |
2768 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
2769 | |
2770 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
2771 | out: |
2772 | seq_putc(m, '\n'); | |
f69ff943 SW |
2773 | return 0; |
2774 | } | |
5b52fc89 | 2775 | |
03a44825 | 2776 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
2777 | .start = m_start, |
2778 | .next = m_next, | |
2779 | .stop = m_stop, | |
871305bb | 2780 | .show = show_numa_map, |
6e21c8f1 | 2781 | }; |
662795de | 2782 | |
b7643757 SP |
2783 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
2784 | { | |
871305bb VB |
2785 | return proc_maps_open(inode, file, &proc_pid_numa_maps_op, |
2786 | sizeof(struct numa_maps_private)); | |
b7643757 SP |
2787 | } |
2788 | ||
2789 | const struct file_operations proc_pid_numa_maps_operations = { | |
2790 | .open = pid_numa_maps_open, | |
2791 | .read = seq_read, | |
2792 | .llseek = seq_lseek, | |
29a40ace | 2793 | .release = proc_map_release, |
b7643757 SP |
2794 | }; |
2795 | ||
f69ff943 | 2796 | #endif /* CONFIG_NUMA */ |