1 /*-
2 * Copyright (c) 2010 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * Copyright (c) 2008 Semihalf, Grzegorz Bernacki
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * from: FreeBSD: src/sys/arm/arm/minidump_machdep.c v214223
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/11.0/sys/mips/mips/minidump_machdep.c 295880 2016-02-22 09:02:20Z skra $");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/conf.h>
36 #include <sys/cons.h>
37 #include <sys/kernel.h>
38 #include <sys/kerneldump.h>
39 #include <sys/msgbuf.h>
40 #include <vm/vm.h>
41 #include <vm/pmap.h>
42 #include <machine/atomic.h>
43 #include <machine/elf.h>
44 #include <machine/md_var.h>
45 #include <machine/vmparam.h>
46 #include <machine/minidump.h>
47 #include <machine/cache.h>
48
49 CTASSERT(sizeof(struct kerneldumpheader) == 512);
50
51 /*
52 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
53 * is to protect us from metadata and to protect metadata from us.
54 */
55 #define SIZEOF_METADATA (64*1024)
56
57 uint32_t *vm_page_dump;
58 int vm_page_dump_size;
59
60 static struct kerneldumpheader kdh;
61 static off_t dumplo;
62 static off_t origdumplo;
63
64 /* Handle chunked writes. */
65 static uint64_t counter, progress;
66 /* Just auxiliary bufffer */
67 static char tmpbuffer[PAGE_SIZE];
68
69 extern pd_entry_t *kernel_segmap;
70
71 CTASSERT(sizeof(*vm_page_dump) == 4);
72
73 static int
74 is_dumpable(vm_paddr_t pa)
75 {
76 int i;
77
78 for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
79 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
80 return (1);
81 }
82 return (0);
83 }
84
85 void
86 dump_add_page(vm_paddr_t pa)
87 {
88 int idx, bit;
89
90 pa >>= PAGE_SHIFT;
91 idx = pa >> 5; /* 2^5 = 32 */
92 bit = pa & 31;
93 atomic_set_int(&vm_page_dump[idx], 1ul << bit);
94 }
95
96 void
97 dump_drop_page(vm_paddr_t pa)
98 {
99 int idx, bit;
100
101 pa >>= PAGE_SHIFT;
102 idx = pa >> 5; /* 2^5 = 32 */
103 bit = pa & 31;
104 atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
105 }
106
107 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
108
109 static int
110 write_buffer(struct dumperinfo *di, char *ptr, size_t sz)
111 {
112 size_t len;
113 int error, c;
114 u_int maxdumpsz;
115
116 maxdumpsz = di->maxiosize;
117
118 if (maxdumpsz == 0) /* seatbelt */
119 maxdumpsz = PAGE_SIZE;
120
121 error = 0;
122
123 while (sz) {
124 len = min(maxdumpsz, sz);
125 counter += len;
126 progress -= len;
127
128 if (counter >> 22) {
129 printf(" %jd", PG2MB(progress >> PAGE_SHIFT));
130 counter &= (1<<22) - 1;
131 }
132
133 if (ptr) {
134 error = dump_write(di, ptr, 0, dumplo, len);
135 if (error)
136 return (error);
137 dumplo += len;
138 ptr += len;
139 sz -= len;
140 } else {
141 panic("pa is not supported");
142 }
143
144 /* Check for user abort. */
145 c = cncheckc();
146 if (c == 0x03)
147 return (ECANCELED);
148 if (c != -1)
149 printf(" (CTRL-C to abort) ");
150 }
151
152 return (0);
153 }
154
155 int
156 minidumpsys(struct dumperinfo *di)
157 {
158 struct minidumphdr mdhdr;
159 uint64_t dumpsize;
160 uint32_t ptesize;
161 uint32_t bits;
162 vm_paddr_t pa;
163 vm_offset_t prev_pte = 0;
164 uint32_t count = 0;
165 vm_offset_t va;
166 pt_entry_t *pte;
167 int i, bit, error;
168 void *dump_va;
169
170 /* Flush cache */
171 mips_dcache_wbinv_all();
172
173 counter = 0;
174 /* Walk page table pages, set bits in vm_page_dump */
175 ptesize = 0;
176
177 for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
178 ptesize += PAGE_SIZE;
179 pte = pmap_pte(kernel_pmap, va);
180 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
181 for (i = 0; i < NPTEPG; i++) {
182 if (pte_test(&pte[i], PTE_V)) {
183 pa = TLBLO_PTE_TO_PA(pte[i]);
184 if (is_dumpable(pa))
185 dump_add_page(pa);
186 }
187 }
188 }
189
190 /*
191 * Now mark pages from 0 to phys_avail[0], that's where kernel
192 * and pages allocated by pmap_steal reside
193 */
194 for (pa = 0; pa < phys_avail[0]; pa += PAGE_SIZE) {
195 if (is_dumpable(pa))
196 dump_add_page(pa);
197 }
198
199 /* Calculate dump size. */
200 dumpsize = ptesize;
201 dumpsize += round_page(msgbufp->msg_size);
202 dumpsize += round_page(vm_page_dump_size);
203
204 for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
205 bits = vm_page_dump[i];
206 while (bits) {
207 bit = ffs(bits) - 1;
208 pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
209 bit) * PAGE_SIZE;
210 /* Clear out undumpable pages now if needed */
211 if (is_dumpable(pa))
212 dumpsize += PAGE_SIZE;
213 else
214 dump_drop_page(pa);
215 bits &= ~(1ul << bit);
216 }
217 }
218
219 dumpsize += PAGE_SIZE;
220
221 /* Determine dump offset on device. */
222 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
223 error = ENOSPC;
224 goto fail;
225 }
226
227 origdumplo = dumplo = di->mediaoffset + di->mediasize - dumpsize;
228 dumplo -= sizeof(kdh) * 2;
229 progress = dumpsize;
230
231 /* Initialize mdhdr */
232 bzero(&mdhdr, sizeof(mdhdr));
233 strcpy(mdhdr.magic, MINIDUMP_MAGIC);
234 mdhdr.version = MINIDUMP_VERSION;
235 mdhdr.msgbufsize = msgbufp->msg_size;
236 mdhdr.bitmapsize = vm_page_dump_size;
237 mdhdr.ptesize = ptesize;
238 mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
239
240 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION, dumpsize,
241 di->blocksize);
242
243 printf("Physical memory: %ju MB\n",
244 (uintmax_t)ptoa((uintmax_t)physmem) / 1048576);
245 printf("Dumping %llu MB:", (long long)dumpsize >> 20);
246
247 /* Dump leader */
248 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
249 if (error)
250 goto fail;
251 dumplo += sizeof(kdh);
252
253 /* Dump my header */
254 bzero(tmpbuffer, sizeof(tmpbuffer));
255 bcopy(&mdhdr, tmpbuffer, sizeof(mdhdr));
256 error = write_buffer(di, tmpbuffer, PAGE_SIZE);
257 if (error)
258 goto fail;
259
260 /* Dump msgbuf up front */
261 error = write_buffer(di, (char *)msgbufp->msg_ptr,
262 round_page(msgbufp->msg_size));
263 if (error)
264 goto fail;
265
266 /* Dump bitmap */
267 error = write_buffer(di, (char *)vm_page_dump,
268 round_page(vm_page_dump_size));
269 if (error)
270 goto fail;
271
272 /* Dump kernel page table pages */
273 for (va = VM_MIN_KERNEL_ADDRESS; va < kernel_vm_end; va += NBPDR) {
274 pte = pmap_pte(kernel_pmap, va);
275 KASSERT(pte != NULL, ("pte for %jx is NULL", (uintmax_t)va));
276 if (!count) {
277 prev_pte = (vm_offset_t)pte;
278 count++;
279 }
280 else {
281 if ((vm_offset_t)pte == (prev_pte + count * PAGE_SIZE))
282 count++;
283 else {
284 error = write_buffer(di, (char*)prev_pte,
285 count * PAGE_SIZE);
286 if (error)
287 goto fail;
288 count = 1;
289 prev_pte = (vm_offset_t)pte;
290 }
291 }
292 }
293
294 if (count) {
295 error = write_buffer(di, (char*)prev_pte, count * PAGE_SIZE);
296 if (error)
297 goto fail;
298 count = 0;
299 prev_pte = 0;
300 }
301
302 /* Dump memory chunks page by page*/
303 for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
304 bits = vm_page_dump[i];
305 while (bits) {
306 bit = ffs(bits) - 1;
307 pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
308 bit) * PAGE_SIZE;
309 dump_va = pmap_kenter_temporary(pa, 0);
310 error = write_buffer(di, dump_va, PAGE_SIZE);
311 if (error)
312 goto fail;
313 pmap_kenter_temporary_free(pa);
314 bits &= ~(1ul << bit);
315 }
316 }
317
318 /* Dump trailer */
319 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
320 if (error)
321 goto fail;
322 dumplo += sizeof(kdh);
323
324 /* Signal completion, signoff and exit stage left. */
325 dump_write(di, NULL, 0, 0, 0);
326 printf("\nDump complete\n");
327 return (0);
328
329 fail:
330 if (error < 0)
331 error = -error;
332
333 if (error == ECANCELED)
334 printf("\nDump aborted\n");
335 else if (error == ENOSPC)
336 printf("\nDump failed. Partition too small.\n");
337 else
338 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
339 return (error);
340 }
Cache object: 4afc82ff927540d07b3a0f3591e8dc7c
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