mmap: remove the IA64-specific vma expansion implementation
[linux-2.6-microblaze.git] / mm / debug.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * mm/debug.c
4  *
5  * mm/ specific debug routines.
6  *
7  */
8
9 #include <linux/kernel.h>
10 #include <linux/mm.h>
11 #include <linux/trace_events.h>
12 #include <linux/memcontrol.h>
13 #include <trace/events/mmflags.h>
14 #include <linux/migrate.h>
15 #include <linux/page_owner.h>
16 #include <linux/ctype.h>
17
18 #include "internal.h"
19 #include <trace/events/migrate.h>
20
21 /*
22  * Define EM() and EMe() so that MIGRATE_REASON from trace/events/migrate.h can
23  * be used to populate migrate_reason_names[].
24  */
25 #undef EM
26 #undef EMe
27 #define EM(a, b)        b,
28 #define EMe(a, b)       b
29
30 const char *migrate_reason_names[MR_TYPES] = {
31         MIGRATE_REASON
32 };
33
34 const struct trace_print_flags pageflag_names[] = {
35         __def_pageflag_names,
36         {0, NULL}
37 };
38
39 const struct trace_print_flags pagetype_names[] = {
40         __def_pagetype_names,
41         {0, NULL}
42 };
43
44 const struct trace_print_flags gfpflag_names[] = {
45         __def_gfpflag_names,
46         {0, NULL}
47 };
48
49 const struct trace_print_flags vmaflag_names[] = {
50         __def_vmaflag_names,
51         {0, NULL}
52 };
53
54 static void __dump_page(struct page *page)
55 {
56         struct folio *folio = page_folio(page);
57         struct page *head = &folio->page;
58         struct address_space *mapping;
59         bool compound = PageCompound(page);
60         /*
61          * Accessing the pageblock without the zone lock. It could change to
62          * "isolate" again in the meantime, but since we are just dumping the
63          * state for debugging, it should be fine to accept a bit of
64          * inaccuracy here due to racing.
65          */
66         bool page_cma = is_migrate_cma_page(page);
67         int mapcount;
68         char *type = "";
69
70         if (page < head || (page >= head + MAX_ORDER_NR_PAGES)) {
71                 /*
72                  * Corrupt page, so we cannot call page_mapping. Instead, do a
73                  * safe subset of the steps that page_mapping() does. Caution:
74                  * this will be misleading for tail pages, PageSwapCache pages,
75                  * and potentially other situations. (See the page_mapping()
76                  * implementation for what's missing here.)
77                  */
78                 unsigned long tmp = (unsigned long)page->mapping;
79
80                 if (tmp & PAGE_MAPPING_ANON)
81                         mapping = NULL;
82                 else
83                         mapping = (void *)(tmp & ~PAGE_MAPPING_FLAGS);
84                 head = page;
85                 folio = (struct folio *)page;
86                 compound = false;
87         } else {
88                 mapping = page_mapping(page);
89         }
90
91         /*
92          * Avoid VM_BUG_ON() in page_mapcount().
93          * page->_mapcount space in struct page is used by sl[aou]b pages to
94          * encode own info.
95          */
96         mapcount = PageSlab(head) ? 0 : page_mapcount(page);
97
98         pr_warn("page:%p refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
99                         page, page_ref_count(head), mapcount, mapping,
100                         page_to_pgoff(page), page_to_pfn(page));
101         if (compound) {
102                 pr_warn("head:%p order:%u entire_mapcount:%d nr_pages_mapped:%d pincount:%d\n",
103                                 head, compound_order(head),
104                                 folio_entire_mapcount(folio),
105                                 folio_nr_pages_mapped(folio),
106                                 atomic_read(&folio->_pincount));
107         }
108
109 #ifdef CONFIG_MEMCG
110         if (head->memcg_data)
111                 pr_warn("memcg:%lx\n", head->memcg_data);
112 #endif
113         if (PageKsm(page))
114                 type = "ksm ";
115         else if (PageAnon(page))
116                 type = "anon ";
117         else if (mapping)
118                 dump_mapping(mapping);
119         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
120
121         pr_warn("%sflags: %pGp%s\n", type, &head->flags,
122                 page_cma ? " CMA" : "");
123         pr_warn("page_type: %pGt\n", &head->page_type);
124
125         print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
126                         sizeof(unsigned long), page,
127                         sizeof(struct page), false);
128         if (head != page)
129                 print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32,
130                         sizeof(unsigned long), head,
131                         sizeof(struct page), false);
132 }
133
134 void dump_page(struct page *page, const char *reason)
135 {
136         if (PagePoisoned(page))
137                 pr_warn("page:%p is uninitialized and poisoned", page);
138         else
139                 __dump_page(page);
140         if (reason)
141                 pr_warn("page dumped because: %s\n", reason);
142         dump_page_owner(page);
143 }
144 EXPORT_SYMBOL(dump_page);
145
146 #ifdef CONFIG_DEBUG_VM
147
148 void dump_vma(const struct vm_area_struct *vma)
149 {
150         pr_emerg("vma %px start %px end %px mm %px\n"
151                 "prot %lx anon_vma %px vm_ops %px\n"
152                 "pgoff %lx file %px private_data %px\n"
153                 "flags: %#lx(%pGv)\n",
154                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm,
155                 (unsigned long)pgprot_val(vma->vm_page_prot),
156                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
157                 vma->vm_file, vma->vm_private_data,
158                 vma->vm_flags, &vma->vm_flags);
159 }
160 EXPORT_SYMBOL(dump_vma);
161
162 void dump_mm(const struct mm_struct *mm)
163 {
164         pr_emerg("mm %px task_size %lu\n"
165 #ifdef CONFIG_MMU
166                 "get_unmapped_area %px\n"
167 #endif
168                 "mmap_base %lu mmap_legacy_base %lu\n"
169                 "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
170                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
171                 "pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
172                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
173                 "start_brk %lx brk %lx start_stack %lx\n"
174                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
175                 "binfmt %px flags %lx\n"
176 #ifdef CONFIG_AIO
177                 "ioctx_table %px\n"
178 #endif
179 #ifdef CONFIG_MEMCG
180                 "owner %px "
181 #endif
182                 "exe_file %px\n"
183 #ifdef CONFIG_MMU_NOTIFIER
184                 "notifier_subscriptions %px\n"
185 #endif
186 #ifdef CONFIG_NUMA_BALANCING
187                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
188 #endif
189                 "tlb_flush_pending %d\n"
190                 "def_flags: %#lx(%pGv)\n",
191
192                 mm, mm->task_size,
193 #ifdef CONFIG_MMU
194                 mm->get_unmapped_area,
195 #endif
196                 mm->mmap_base, mm->mmap_legacy_base,
197                 mm->pgd, atomic_read(&mm->mm_users),
198                 atomic_read(&mm->mm_count),
199                 mm_pgtables_bytes(mm),
200                 mm->map_count,
201                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
202                 (u64)atomic64_read(&mm->pinned_vm),
203                 mm->data_vm, mm->exec_vm, mm->stack_vm,
204                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
205                 mm->start_brk, mm->brk, mm->start_stack,
206                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
207                 mm->binfmt, mm->flags,
208 #ifdef CONFIG_AIO
209                 mm->ioctx_table,
210 #endif
211 #ifdef CONFIG_MEMCG
212                 mm->owner,
213 #endif
214                 mm->exe_file,
215 #ifdef CONFIG_MMU_NOTIFIER
216                 mm->notifier_subscriptions,
217 #endif
218 #ifdef CONFIG_NUMA_BALANCING
219                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
220 #endif
221                 atomic_read(&mm->tlb_flush_pending),
222                 mm->def_flags, &mm->def_flags
223         );
224 }
225 EXPORT_SYMBOL(dump_mm);
226
227 static bool page_init_poisoning __read_mostly = true;
228
229 static int __init setup_vm_debug(char *str)
230 {
231         bool __page_init_poisoning = true;
232
233         /*
234          * Calling vm_debug with no arguments is equivalent to requesting
235          * to enable all debugging options we can control.
236          */
237         if (*str++ != '=' || !*str)
238                 goto out;
239
240         __page_init_poisoning = false;
241         if (*str == '-')
242                 goto out;
243
244         while (*str) {
245                 switch (tolower(*str)) {
246                 case'p':
247                         __page_init_poisoning = true;
248                         break;
249                 default:
250                         pr_err("vm_debug option '%c' unknown. skipped\n",
251                                *str);
252                 }
253
254                 str++;
255         }
256 out:
257         if (page_init_poisoning && !__page_init_poisoning)
258                 pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
259
260         page_init_poisoning = __page_init_poisoning;
261
262         return 1;
263 }
264 __setup("vm_debug", setup_vm_debug);
265
266 void page_init_poison(struct page *page, size_t size)
267 {
268         if (page_init_poisoning)
269                 memset(page, PAGE_POISON_PATTERN, size);
270 }
271
272 void vma_iter_dump_tree(const struct vma_iterator *vmi)
273 {
274 #if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
275         mas_dump(&vmi->mas);
276         mt_dump(vmi->mas.tree, mt_dump_hex);
277 #endif  /* CONFIG_DEBUG_VM_MAPLE_TREE */
278 }
279
280 #endif          /* CONFIG_DEBUG_VM */