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/ftrace_event.h>
11#include <linux/memcontrol.h>
12
13static 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};
52
53static void dump_flags(unsigned long flags,
54			const struct trace_print_flags *names, int count)
55{
56	const char *delim = "";
57	unsigned long mask;
58	int i;
59
60	pr_emerg("flags: %#lx(", flags);
61
62	/* remove zone id */
63	flags &= (1UL << NR_PAGEFLAGS) - 1;
64
65	for (i = 0; i < count && flags; i++) {
66
67		mask = names[i].mask;
68		if ((flags & mask) != mask)
69			continue;
70
71		flags &= ~mask;
72		pr_cont("%s%s", delim, names[i].name);
73		delim = "|";
74	}
75
76	/* check for left over flags */
77	if (flags)
78		pr_cont("%s%#lx", delim, flags);
79
80	pr_cont(")\n");
81}
82
83void dump_page_badflags(struct page *page, const char *reason,
84		unsigned long badflags)
85{
86	pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
87		  page, atomic_read(&page->_count), page_mapcount(page),
88		  page->mapping, page->index);
89	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
90	dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
91	if (reason)
92		pr_alert("page dumped because: %s\n", reason);
93	if (page->flags & badflags) {
94		pr_alert("bad because of flags:\n");
95		dump_flags(page->flags & badflags,
96				pageflag_names, ARRAY_SIZE(pageflag_names));
97	}
98#ifdef CONFIG_MEMCG
99	if (page->mem_cgroup)
100		pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
101#endif
102}
103
104void dump_page(struct page *page, const char *reason)
105{
106	dump_page_badflags(page, reason, 0);
107}
108EXPORT_SYMBOL(dump_page);
109
110#ifdef CONFIG_DEBUG_VM
111
112static const struct trace_print_flags vmaflags_names[] = {
113	{VM_READ,			"read"		},
114	{VM_WRITE,			"write"		},
115	{VM_EXEC,			"exec"		},
116	{VM_SHARED,			"shared"	},
117	{VM_MAYREAD,			"mayread"	},
118	{VM_MAYWRITE,			"maywrite"	},
119	{VM_MAYEXEC,			"mayexec"	},
120	{VM_MAYSHARE,			"mayshare"	},
121	{VM_GROWSDOWN,			"growsdown"	},
122	{VM_PFNMAP,			"pfnmap"	},
123	{VM_DENYWRITE,			"denywrite"	},
124	{VM_LOCKED,			"locked"	},
125	{VM_IO,				"io"		},
126	{VM_SEQ_READ,			"seqread"	},
127	{VM_RAND_READ,			"randread"	},
128	{VM_DONTCOPY,			"dontcopy"	},
129	{VM_DONTEXPAND,			"dontexpand"	},
130	{VM_ACCOUNT,			"account"	},
131	{VM_NORESERVE,			"noreserve"	},
132	{VM_HUGETLB,			"hugetlb"	},
133#if defined(CONFIG_X86)
134	{VM_PAT,			"pat"		},
135#elif defined(CONFIG_PPC)
136	{VM_SAO,			"sao"		},
137#elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64)
138	{VM_GROWSUP,			"growsup"	},
139#elif !defined(CONFIG_MMU)
140	{VM_MAPPED_COPY,		"mappedcopy"	},
141#else
142	{VM_ARCH_1,			"arch_1"	},
143#endif
144	{VM_DONTDUMP,			"dontdump"	},
145#ifdef CONFIG_MEM_SOFT_DIRTY
146	{VM_SOFTDIRTY,			"softdirty"	},
147#endif
148	{VM_MIXEDMAP,			"mixedmap"	},
149	{VM_HUGEPAGE,			"hugepage"	},
150	{VM_NOHUGEPAGE,			"nohugepage"	},
151	{VM_MERGEABLE,			"mergeable"	},
152};
153
154void dump_vma(const struct vm_area_struct *vma)
155{
156	pr_emerg("vma %p start %p end %p\n"
157		"next %p prev %p mm %p\n"
158		"prot %lx anon_vma %p vm_ops %p\n"
159		"pgoff %lx file %p private_data %p\n",
160		vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
161		vma->vm_prev, vma->vm_mm,
162		(unsigned long)pgprot_val(vma->vm_page_prot),
163		vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
164		vma->vm_file, vma->vm_private_data);
165	dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
166}
167EXPORT_SYMBOL(dump_vma);
168
169void dump_mm(const struct mm_struct *mm)
170{
171	pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
172#ifdef CONFIG_MMU
173		"get_unmapped_area %p\n"
174#endif
175		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
176		"pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
177		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
178		"pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n"
179		"start_code %lx end_code %lx start_data %lx end_data %lx\n"
180		"start_brk %lx brk %lx start_stack %lx\n"
181		"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
182		"binfmt %p flags %lx core_state %p\n"
183#ifdef CONFIG_AIO
184		"ioctx_table %p\n"
185#endif
186#ifdef CONFIG_MEMCG
187		"owner %p "
188#endif
189		"exe_file %p\n"
190#ifdef CONFIG_MMU_NOTIFIER
191		"mmu_notifier_mm %p\n"
192#endif
193#ifdef CONFIG_NUMA_BALANCING
194		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
195#endif
196#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
197		"tlb_flush_pending %d\n"
198#endif
199		"%s",	/* This is here to hold the comma */
200
201		mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
202#ifdef CONFIG_MMU
203		mm->get_unmapped_area,
204#endif
205		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
206		mm->pgd, atomic_read(&mm->mm_users),
207		atomic_read(&mm->mm_count),
208		atomic_long_read((atomic_long_t *)&mm->nr_ptes),
209		mm_nr_pmds((struct mm_struct *)mm),
210		mm->map_count,
211		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
212		mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm,
213		mm->start_code, mm->end_code, mm->start_data, mm->end_data,
214		mm->start_brk, mm->brk, mm->start_stack,
215		mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
216		mm->binfmt, mm->flags, mm->core_state,
217#ifdef CONFIG_AIO
218		mm->ioctx_table,
219#endif
220#ifdef CONFIG_MEMCG
221		mm->owner,
222#endif
223		mm->exe_file,
224#ifdef CONFIG_MMU_NOTIFIER
225		mm->mmu_notifier_mm,
226#endif
227#ifdef CONFIG_NUMA_BALANCING
228		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
229#endif
230#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
231		mm->tlb_flush_pending,
232#endif
233		""		/* This is here to not have a comma! */
234		);
235
236		dump_flags(mm->def_flags, vmaflags_names,
237				ARRAY_SIZE(vmaflags_names));
238}
239
240#endif		/* CONFIG_DEBUG_VM */
241