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Linux/arch/s390/mm/dump_pagetables.c

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  1 #include <linux/seq_file.h>
  2 #include <linux/debugfs.h>
  3 #include <linux/module.h>
  4 #include <linux/mm.h>
  5 #include <asm/sections.h>
  6 #include <asm/pgtable.h>
  7 
  8 static unsigned long max_addr;
  9 
 10 struct addr_marker {
 11         unsigned long start_address;
 12         const char *name;
 13 };
 14 
 15 enum address_markers_idx {
 16         IDENTITY_NR = 0,
 17         KERNEL_START_NR,
 18         KERNEL_END_NR,
 19         VMEMMAP_NR,
 20         VMALLOC_NR,
 21 #ifdef CONFIG_64BIT
 22         MODULES_NR,
 23 #endif
 24 };
 25 
 26 static struct addr_marker address_markers[] = {
 27         [IDENTITY_NR]     = {0, "Identity Mapping"},
 28         [KERNEL_START_NR] = {(unsigned long)&_stext, "Kernel Image Start"},
 29         [KERNEL_END_NR]   = {(unsigned long)&_end, "Kernel Image End"},
 30         [VMEMMAP_NR]      = {0, "vmemmap Area"},
 31         [VMALLOC_NR]      = {0, "vmalloc Area"},
 32 #ifdef CONFIG_64BIT
 33         [MODULES_NR]      = {0, "Modules Area"},
 34 #endif
 35         { -1, NULL }
 36 };
 37 
 38 struct pg_state {
 39         int level;
 40         unsigned int current_prot;
 41         unsigned long start_address;
 42         unsigned long current_address;
 43         const struct addr_marker *marker;
 44 };
 45 
 46 static void print_prot(struct seq_file *m, unsigned int pr, int level)
 47 {
 48         static const char * const level_name[] =
 49                 { "ASCE", "PGD", "PUD", "PMD", "PTE" };
 50 
 51         seq_printf(m, "%s ", level_name[level]);
 52         if (pr & _PAGE_INVALID) {
 53                 seq_printf(m, "I\n");
 54                 return;
 55         }
 56         seq_printf(m, "%s", pr & _PAGE_PROTECT ? "RO " : "RW ");
 57         seq_putc(m, '\n');
 58 }
 59 
 60 static void note_page(struct seq_file *m, struct pg_state *st,
 61                      unsigned int new_prot, int level)
 62 {
 63         static const char units[] = "KMGTPE";
 64         int width = sizeof(unsigned long) * 2;
 65         const char *unit = units;
 66         unsigned int prot, cur;
 67         unsigned long delta;
 68 
 69         /*
 70          * If we have a "break" in the series, we need to flush the state
 71          * that we have now. "break" is either changing perms, levels or
 72          * address space marker.
 73          */
 74         prot = new_prot;
 75         cur = st->current_prot;
 76 
 77         if (!st->level) {
 78                 /* First entry */
 79                 st->current_prot = new_prot;
 80                 st->level = level;
 81                 st->marker = address_markers;
 82                 seq_printf(m, "---[ %s ]---\n", st->marker->name);
 83         } else if (prot != cur || level != st->level ||
 84                    st->current_address >= st->marker[1].start_address) {
 85                 /* Print the actual finished series */
 86                 seq_printf(m, "0x%0*lx-0x%0*lx",
 87                            width, st->start_address,
 88                            width, st->current_address);
 89                 delta = (st->current_address - st->start_address) >> 10;
 90                 while (!(delta & 0x3ff) && unit[1]) {
 91                         delta >>= 10;
 92                         unit++;
 93                 }
 94                 seq_printf(m, "%9lu%c ", delta, *unit);
 95                 print_prot(m, st->current_prot, st->level);
 96                 if (st->current_address >= st->marker[1].start_address) {
 97                         st->marker++;
 98                         seq_printf(m, "---[ %s ]---\n", st->marker->name);
 99                 }
100                 st->start_address = st->current_address;
101                 st->current_prot = new_prot;
102                 st->level = level;
103         }
104 }
105 
106 /*
107  * The actual page table walker functions. In order to keep the
108  * implementation of print_prot() short, we only check and pass
109  * _PAGE_INVALID and _PAGE_PROTECT flags to note_page() if a region,
110  * segment or page table entry is invalid or read-only.
111  * After all it's just a hint that the current level being walked
112  * contains an invalid or read-only entry.
113  */
114 static void walk_pte_level(struct seq_file *m, struct pg_state *st,
115                            pmd_t *pmd, unsigned long addr)
116 {
117         unsigned int prot;
118         pte_t *pte;
119         int i;
120 
121         for (i = 0; i < PTRS_PER_PTE && addr < max_addr; i++) {
122                 st->current_address = addr;
123                 pte = pte_offset_kernel(pmd, addr);
124                 prot = pte_val(*pte) & (_PAGE_PROTECT | _PAGE_INVALID);
125                 note_page(m, st, prot, 4);
126                 addr += PAGE_SIZE;
127         }
128 }
129 
130 #ifdef CONFIG_64BIT
131 #define _PMD_PROT_MASK _SEGMENT_ENTRY_PROTECT
132 #else
133 #define _PMD_PROT_MASK 0
134 #endif
135 
136 static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
137                            pud_t *pud, unsigned long addr)
138 {
139         unsigned int prot;
140         pmd_t *pmd;
141         int i;
142 
143         for (i = 0; i < PTRS_PER_PMD && addr < max_addr; i++) {
144                 st->current_address = addr;
145                 pmd = pmd_offset(pud, addr);
146                 if (!pmd_none(*pmd)) {
147                         if (pmd_large(*pmd)) {
148                                 prot = pmd_val(*pmd) & _PMD_PROT_MASK;
149                                 note_page(m, st, prot, 3);
150                         } else
151                                 walk_pte_level(m, st, pmd, addr);
152                 } else
153                         note_page(m, st, _PAGE_INVALID, 3);
154                 addr += PMD_SIZE;
155         }
156 }
157 
158 #ifdef CONFIG_64BIT
159 #define _PUD_PROT_MASK _REGION3_ENTRY_RO
160 #else
161 #define _PUD_PROT_MASK 0
162 #endif
163 
164 static void walk_pud_level(struct seq_file *m, struct pg_state *st,
165                            pgd_t *pgd, unsigned long addr)
166 {
167         unsigned int prot;
168         pud_t *pud;
169         int i;
170 
171         for (i = 0; i < PTRS_PER_PUD && addr < max_addr; i++) {
172                 st->current_address = addr;
173                 pud = pud_offset(pgd, addr);
174                 if (!pud_none(*pud))
175                         if (pud_large(*pud)) {
176                                 prot = pud_val(*pud) & _PUD_PROT_MASK;
177                                 note_page(m, st, prot, 2);
178                         } else
179                                 walk_pmd_level(m, st, pud, addr);
180                 else
181                         note_page(m, st, _PAGE_INVALID, 2);
182                 addr += PUD_SIZE;
183         }
184 }
185 
186 static void walk_pgd_level(struct seq_file *m)
187 {
188         unsigned long addr = 0;
189         struct pg_state st;
190         pgd_t *pgd;
191         int i;
192 
193         memset(&st, 0, sizeof(st));
194         for (i = 0; i < PTRS_PER_PGD && addr < max_addr; i++) {
195                 st.current_address = addr;
196                 pgd = pgd_offset_k(addr);
197                 if (!pgd_none(*pgd))
198                         walk_pud_level(m, &st, pgd, addr);
199                 else
200                         note_page(m, &st, _PAGE_INVALID, 1);
201                 addr += PGDIR_SIZE;
202         }
203         /* Flush out the last page */
204         st.current_address = max_addr;
205         note_page(m, &st, 0, 0);
206 }
207 
208 static int ptdump_show(struct seq_file *m, void *v)
209 {
210         walk_pgd_level(m);
211         return 0;
212 }
213 
214 static int ptdump_open(struct inode *inode, struct file *filp)
215 {
216         return single_open(filp, ptdump_show, NULL);
217 }
218 
219 static const struct file_operations ptdump_fops = {
220         .open           = ptdump_open,
221         .read           = seq_read,
222         .llseek         = seq_lseek,
223         .release        = single_release,
224 };
225 
226 static int pt_dump_init(void)
227 {
228         /*
229          * Figure out the maximum virtual address being accessible with the
230          * kernel ASCE. We need this to keep the page table walker functions
231          * from accessing non-existent entries.
232          */
233 #ifdef CONFIG_32BIT
234         max_addr = 1UL << 31;
235 #else
236         max_addr = (S390_lowcore.kernel_asce & _REGION_ENTRY_TYPE_MASK) >> 2;
237         max_addr = 1UL << (max_addr * 11 + 31);
238         address_markers[MODULES_NR].start_address = MODULES_VADDR;
239 #endif
240         address_markers[VMEMMAP_NR].start_address = (unsigned long) vmemmap;
241         address_markers[VMALLOC_NR].start_address = VMALLOC_START;
242         debugfs_create_file("kernel_page_tables", 0400, NULL, NULL, &ptdump_fops);
243         return 0;
244 }
245 device_initcall(pt_dump_init);
246 

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