Merge remote-tracking branches 'regulator/topic/supply', 'regulator/topic/tps6105x...
[firefly-linux-kernel-4.4.55.git] / mm / debug.c
1 /*
2  * mm/debug.c
3  *
4  * mm/ specific debug routines.
5  *
6  */
7
8 #include <linux/kernel.h>
9 #include <linux/mm.h>
10 #include <linux/trace_events.h>
11 #include <linux/memcontrol.h>
12
13 static const struct trace_print_flags pageflag_names[] = {
14         {1UL << PG_locked,              "locked"        },
15         {1UL << PG_error,               "error"         },
16         {1UL << PG_referenced,          "referenced"    },
17         {1UL << PG_uptodate,            "uptodate"      },
18         {1UL << PG_dirty,               "dirty"         },
19         {1UL << PG_lru,                 "lru"           },
20         {1UL << PG_active,              "active"        },
21         {1UL << PG_slab,                "slab"          },
22         {1UL << PG_owner_priv_1,        "owner_priv_1"  },
23         {1UL << PG_arch_1,              "arch_1"        },
24         {1UL << PG_reserved,            "reserved"      },
25         {1UL << PG_private,             "private"       },
26         {1UL << PG_private_2,           "private_2"     },
27         {1UL << PG_writeback,           "writeback"     },
28 #ifdef CONFIG_PAGEFLAGS_EXTENDED
29         {1UL << PG_head,                "head"          },
30         {1UL << PG_tail,                "tail"          },
31 #else
32         {1UL << PG_compound,            "compound"      },
33 #endif
34         {1UL << PG_swapcache,           "swapcache"     },
35         {1UL << PG_mappedtodisk,        "mappedtodisk"  },
36         {1UL << PG_reclaim,             "reclaim"       },
37         {1UL << PG_swapbacked,          "swapbacked"    },
38         {1UL << PG_unevictable,         "unevictable"   },
39 #ifdef CONFIG_MMU
40         {1UL << PG_mlocked,             "mlocked"       },
41 #endif
42 #ifdef CONFIG_ARCH_USES_PG_UNCACHED
43         {1UL << PG_uncached,            "uncached"      },
44 #endif
45 #ifdef CONFIG_MEMORY_FAILURE
46         {1UL << PG_hwpoison,            "hwpoison"      },
47 #endif
48 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
49         {1UL << PG_compound_lock,       "compound_lock" },
50 #endif
51 #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
52         {1UL << PG_young,               "young"         },
53         {1UL << PG_idle,                "idle"          },
54 #endif
55 };
56
57 static void dump_flags(unsigned long flags,
58                         const struct trace_print_flags *names, int count)
59 {
60         const char *delim = "";
61         unsigned long mask;
62         int i;
63
64         pr_emerg("flags: %#lx(", flags);
65
66         /* remove zone id */
67         flags &= (1UL << NR_PAGEFLAGS) - 1;
68
69         for (i = 0; i < count && flags; i++) {
70
71                 mask = names[i].mask;
72                 if ((flags & mask) != mask)
73                         continue;
74
75                 flags &= ~mask;
76                 pr_cont("%s%s", delim, names[i].name);
77                 delim = "|";
78         }
79
80         /* check for left over flags */
81         if (flags)
82                 pr_cont("%s%#lx", delim, flags);
83
84         pr_cont(")\n");
85 }
86
87 void dump_page_badflags(struct page *page, const char *reason,
88                 unsigned long badflags)
89 {
90         pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
91                   page, atomic_read(&page->_count), page_mapcount(page),
92                   page->mapping, page->index);
93         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
94         dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
95         if (reason)
96                 pr_alert("page dumped because: %s\n", reason);
97         if (page->flags & badflags) {
98                 pr_alert("bad because of flags:\n");
99                 dump_flags(page->flags & badflags,
100                                 pageflag_names, ARRAY_SIZE(pageflag_names));
101         }
102 #ifdef CONFIG_MEMCG
103         if (page->mem_cgroup)
104                 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
105 #endif
106 }
107
108 void dump_page(struct page *page, const char *reason)
109 {
110         dump_page_badflags(page, reason, 0);
111 }
112 EXPORT_SYMBOL(dump_page);
113
114 #ifdef CONFIG_DEBUG_VM
115
116 static const struct trace_print_flags vmaflags_names[] = {
117         {VM_READ,                       "read"          },
118         {VM_WRITE,                      "write"         },
119         {VM_EXEC,                       "exec"          },
120         {VM_SHARED,                     "shared"        },
121         {VM_MAYREAD,                    "mayread"       },
122         {VM_MAYWRITE,                   "maywrite"      },
123         {VM_MAYEXEC,                    "mayexec"       },
124         {VM_MAYSHARE,                   "mayshare"      },
125         {VM_GROWSDOWN,                  "growsdown"     },
126         {VM_PFNMAP,                     "pfnmap"        },
127         {VM_DENYWRITE,                  "denywrite"     },
128         {VM_LOCKED,                     "locked"        },
129         {VM_IO,                         "io"            },
130         {VM_SEQ_READ,                   "seqread"       },
131         {VM_RAND_READ,                  "randread"      },
132         {VM_DONTCOPY,                   "dontcopy"      },
133         {VM_DONTEXPAND,                 "dontexpand"    },
134         {VM_ACCOUNT,                    "account"       },
135         {VM_NORESERVE,                  "noreserve"     },
136         {VM_HUGETLB,                    "hugetlb"       },
137 #if defined(CONFIG_X86)
138         {VM_PAT,                        "pat"           },
139 #elif defined(CONFIG_PPC)
140         {VM_SAO,                        "sao"           },
141 #elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64)
142         {VM_GROWSUP,                    "growsup"       },
143 #elif !defined(CONFIG_MMU)
144         {VM_MAPPED_COPY,                "mappedcopy"    },
145 #else
146         {VM_ARCH_1,                     "arch_1"        },
147 #endif
148         {VM_DONTDUMP,                   "dontdump"      },
149 #ifdef CONFIG_MEM_SOFT_DIRTY
150         {VM_SOFTDIRTY,                  "softdirty"     },
151 #endif
152         {VM_MIXEDMAP,                   "mixedmap"      },
153         {VM_HUGEPAGE,                   "hugepage"      },
154         {VM_NOHUGEPAGE,                 "nohugepage"    },
155         {VM_MERGEABLE,                  "mergeable"     },
156 };
157
158 void dump_vma(const struct vm_area_struct *vma)
159 {
160         pr_emerg("vma %p start %p end %p\n"
161                 "next %p prev %p mm %p\n"
162                 "prot %lx anon_vma %p vm_ops %p\n"
163                 "pgoff %lx file %p private_data %p\n",
164                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
165                 vma->vm_prev, vma->vm_mm,
166                 (unsigned long)pgprot_val(vma->vm_page_prot),
167                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
168                 vma->vm_file, vma->vm_private_data);
169         dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
170 }
171 EXPORT_SYMBOL(dump_vma);
172
173 void dump_mm(const struct mm_struct *mm)
174 {
175         pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
176 #ifdef CONFIG_MMU
177                 "get_unmapped_area %p\n"
178 #endif
179                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
180                 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
181                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
182                 "pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n"
183                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
184                 "start_brk %lx brk %lx start_stack %lx\n"
185                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
186                 "binfmt %p flags %lx core_state %p\n"
187 #ifdef CONFIG_AIO
188                 "ioctx_table %p\n"
189 #endif
190 #ifdef CONFIG_MEMCG
191                 "owner %p "
192 #endif
193                 "exe_file %p\n"
194 #ifdef CONFIG_MMU_NOTIFIER
195                 "mmu_notifier_mm %p\n"
196 #endif
197 #ifdef CONFIG_NUMA_BALANCING
198                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
199 #endif
200 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
201                 "tlb_flush_pending %d\n"
202 #endif
203                 "%s",   /* This is here to hold the comma */
204
205                 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
206 #ifdef CONFIG_MMU
207                 mm->get_unmapped_area,
208 #endif
209                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
210                 mm->pgd, atomic_read(&mm->mm_users),
211                 atomic_read(&mm->mm_count),
212                 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
213                 mm_nr_pmds((struct mm_struct *)mm),
214                 mm->map_count,
215                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
216                 mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm,
217                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
218                 mm->start_brk, mm->brk, mm->start_stack,
219                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
220                 mm->binfmt, mm->flags, mm->core_state,
221 #ifdef CONFIG_AIO
222                 mm->ioctx_table,
223 #endif
224 #ifdef CONFIG_MEMCG
225                 mm->owner,
226 #endif
227                 mm->exe_file,
228 #ifdef CONFIG_MMU_NOTIFIER
229                 mm->mmu_notifier_mm,
230 #endif
231 #ifdef CONFIG_NUMA_BALANCING
232                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
233 #endif
234 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
235                 mm->tlb_flush_pending,
236 #endif
237                 ""              /* This is here to not have a comma! */
238                 );
239
240                 dump_flags(mm->def_flags, vmaflags_names,
241                                 ARRAY_SIZE(vmaflags_names));
242 }
243
244 #endif          /* CONFIG_DEBUG_VM */