1 /*-
2 * Copyright (c) 2006 Peter Wemm
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/8.1/sys/i386/i386/minidump_machdep.c 199583 2009-11-20 15:27:52Z jhb $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/conf.h>
33 #include <sys/cons.h>
34 #include <sys/kernel.h>
35 #include <sys/kerneldump.h>
36 #include <sys/msgbuf.h>
37 #include <vm/vm.h>
38 #include <vm/pmap.h>
39 #include <machine/atomic.h>
40 #include <machine/elf.h>
41 #include <machine/md_var.h>
42 #include <machine/vmparam.h>
43 #include <machine/minidump.h>
44
45 CTASSERT(sizeof(struct kerneldumpheader) == 512);
46
47 /*
48 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
49 * is to protect us from metadata and to protect metadata from us.
50 */
51 #define SIZEOF_METADATA (64*1024)
52
53 #define MD_ALIGN(x) (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
54 #define DEV_ALIGN(x) (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
55
56 uint32_t *vm_page_dump;
57 int vm_page_dump_size;
58
59 static struct kerneldumpheader kdh;
60 static off_t dumplo;
61
62 /* Handle chunked writes. */
63 static size_t fragsz;
64 static void *dump_va;
65 static uint64_t counter, progress;
66
67 CTASSERT(sizeof(*vm_page_dump) == 4);
68
69 static int
70 is_dumpable(vm_paddr_t pa)
71 {
72 int i;
73
74 for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
75 if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
76 return (1);
77 }
78 return (0);
79 }
80
81 #define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
82
83 static int
84 blk_flush(struct dumperinfo *di)
85 {
86 int error;
87
88 if (fragsz == 0)
89 return (0);
90
91 error = dump_write(di, dump_va, 0, dumplo, fragsz);
92 dumplo += fragsz;
93 fragsz = 0;
94 return (error);
95 }
96
97 static int
98 blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
99 {
100 size_t len;
101 int error, i, c;
102 u_int maxdumpsz;
103
104 maxdumpsz = min(di->maxiosize, MAXDUMPPGS * PAGE_SIZE);
105 if (maxdumpsz == 0) /* seatbelt */
106 maxdumpsz = PAGE_SIZE;
107 error = 0;
108 if ((sz % PAGE_SIZE) != 0) {
109 printf("size not page aligned\n");
110 return (EINVAL);
111 }
112 if (ptr != NULL && pa != 0) {
113 printf("cant have both va and pa!\n");
114 return (EINVAL);
115 }
116 if (pa != 0 && (((uintptr_t)ptr) % PAGE_SIZE) != 0) {
117 printf("address not page aligned\n");
118 return (EINVAL);
119 }
120 if (ptr != NULL) {
121 /* If we're doing a virtual dump, flush any pre-existing pa pages */
122 error = blk_flush(di);
123 if (error)
124 return (error);
125 }
126 while (sz) {
127 len = maxdumpsz - fragsz;
128 if (len > sz)
129 len = sz;
130 counter += len;
131 progress -= len;
132 if (counter >> 24) {
133 printf(" %lld", PG2MB(progress >> PAGE_SHIFT));
134 counter &= (1<<24) - 1;
135 }
136 if (ptr) {
137 error = dump_write(di, ptr, 0, dumplo, len);
138 if (error)
139 return (error);
140 dumplo += len;
141 ptr += len;
142 sz -= len;
143 } else {
144 for (i = 0; i < len; i += PAGE_SIZE)
145 dump_va = pmap_kenter_temporary(pa + i, (i + fragsz) >> PAGE_SHIFT);
146 fragsz += len;
147 pa += len;
148 sz -= len;
149 if (fragsz == maxdumpsz) {
150 error = blk_flush(di);
151 if (error)
152 return (error);
153 }
154 }
155
156 /* Check for user abort. */
157 c = cncheckc();
158 if (c == 0x03)
159 return (ECANCELED);
160 if (c != -1)
161 printf(" (CTRL-C to abort) ");
162 }
163
164 return (0);
165 }
166
167 /* A fake page table page, to avoid having to handle both 4K and 2M pages */
168 static pt_entry_t fakept[NPTEPG];
169
170 void
171 minidumpsys(struct dumperinfo *di)
172 {
173 uint64_t dumpsize;
174 uint32_t ptesize;
175 vm_offset_t va;
176 int error;
177 uint32_t bits;
178 uint64_t pa;
179 pd_entry_t *pd;
180 pt_entry_t *pt;
181 int i, j, k, bit;
182 struct minidumphdr mdhdr;
183
184 counter = 0;
185 /* Walk page table pages, set bits in vm_page_dump */
186 ptesize = 0;
187 for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
188 /*
189 * We always write a page, even if it is zero. Each
190 * page written corresponds to 2MB of space
191 */
192 ptesize += PAGE_SIZE;
193 pd = (pd_entry_t *)((uintptr_t)IdlePTD + KERNBASE); /* always mapped! */
194 j = va >> PDRSHIFT;
195 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V)) {
196 /* This is an entire 2M page. */
197 pa = pd[j] & PG_PS_FRAME;
198 for (k = 0; k < NPTEPG; k++) {
199 if (is_dumpable(pa))
200 dump_add_page(pa);
201 pa += PAGE_SIZE;
202 }
203 continue;
204 }
205 if ((pd[j] & PG_V) == PG_V) {
206 /* set bit for each valid page in this 2MB block */
207 pt = pmap_kenter_temporary(pd[j] & PG_FRAME, 0);
208 for (k = 0; k < NPTEPG; k++) {
209 if ((pt[k] & PG_V) == PG_V) {
210 pa = pt[k] & PG_FRAME;
211 if (is_dumpable(pa))
212 dump_add_page(pa);
213 }
214 }
215 } else {
216 /* nothing, we're going to dump a null page */
217 }
218 }
219
220 /* Calculate dump size. */
221 dumpsize = ptesize;
222 dumpsize += round_page(msgbufp->msg_size);
223 dumpsize += round_page(vm_page_dump_size);
224 for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
225 bits = vm_page_dump[i];
226 while (bits) {
227 bit = bsfl(bits);
228 pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
229 /* Clear out undumpable pages now if needed */
230 if (is_dumpable(pa)) {
231 dumpsize += PAGE_SIZE;
232 } else {
233 dump_drop_page(pa);
234 }
235 bits &= ~(1ul << bit);
236 }
237 }
238 dumpsize += PAGE_SIZE;
239
240 /* Determine dump offset on device. */
241 if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
242 error = ENOSPC;
243 goto fail;
244 }
245 dumplo = di->mediaoffset + di->mediasize - dumpsize;
246 dumplo -= sizeof(kdh) * 2;
247 progress = dumpsize;
248
249 /* Initialize mdhdr */
250 bzero(&mdhdr, sizeof(mdhdr));
251 strcpy(mdhdr.magic, MINIDUMP_MAGIC);
252 mdhdr.version = MINIDUMP_VERSION;
253 mdhdr.msgbufsize = msgbufp->msg_size;
254 mdhdr.bitmapsize = vm_page_dump_size;
255 mdhdr.ptesize = ptesize;
256 mdhdr.kernbase = KERNBASE;
257 #ifdef PAE
258 mdhdr.paemode = 1;
259 #endif
260
261 mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_I386_VERSION, dumpsize, di->blocksize);
262
263 printf("Physical memory: %ju MB\n", ptoa((uintmax_t)physmem) / 1048576);
264 printf("Dumping %llu MB:", (long long)dumpsize >> 20);
265
266 /* Dump leader */
267 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
268 if (error)
269 goto fail;
270 dumplo += sizeof(kdh);
271
272 /* Dump my header */
273 bzero(&fakept, sizeof(fakept));
274 bcopy(&mdhdr, &fakept, sizeof(mdhdr));
275 error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
276 if (error)
277 goto fail;
278
279 /* Dump msgbuf up front */
280 error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
281 if (error)
282 goto fail;
283
284 /* Dump bitmap */
285 error = blk_write(di, (char *)vm_page_dump, 0, round_page(vm_page_dump_size));
286 if (error)
287 goto fail;
288
289 /* Dump kernel page table pages */
290 for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
291 /* We always write a page, even if it is zero */
292 pd = (pd_entry_t *)((uintptr_t)IdlePTD + KERNBASE); /* always mapped! */
293 j = va >> PDRSHIFT;
294 if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V)) {
295 /* This is a single 2M block. Generate a fake PTP */
296 pa = pd[j] & PG_PS_FRAME;
297 for (k = 0; k < NPTEPG; k++) {
298 fakept[k] = (pa + (k * PAGE_SIZE)) | PG_V | PG_RW | PG_A | PG_M;
299 }
300 error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
301 if (error)
302 goto fail;
303 /* flush, in case we reuse fakept in the same block */
304 error = blk_flush(di);
305 if (error)
306 goto fail;
307 continue;
308 }
309 if ((pd[j] & PG_V) == PG_V) {
310 pa = pd[j] & PG_FRAME;
311 error = blk_write(di, 0, pa, PAGE_SIZE);
312 if (error)
313 goto fail;
314 } else {
315 bzero(fakept, sizeof(fakept));
316 error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
317 if (error)
318 goto fail;
319 /* flush, in case we reuse fakept in the same block */
320 error = blk_flush(di);
321 if (error)
322 goto fail;
323 }
324 }
325
326 /* Dump memory chunks */
327 /* XXX cluster it up and use blk_dump() */
328 for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
329 bits = vm_page_dump[i];
330 while (bits) {
331 bit = bsfl(bits);
332 pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
333 error = blk_write(di, 0, pa, PAGE_SIZE);
334 if (error)
335 goto fail;
336 bits &= ~(1ul << bit);
337 }
338 }
339
340 error = blk_flush(di);
341 if (error)
342 goto fail;
343
344 /* Dump trailer */
345 error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
346 if (error)
347 goto fail;
348 dumplo += sizeof(kdh);
349
350 /* Signal completion, signoff and exit stage left. */
351 dump_write(di, NULL, 0, 0, 0);
352 printf("\nDump complete\n");
353 return;
354
355 fail:
356 if (error < 0)
357 error = -error;
358
359 if (error == ECANCELED)
360 printf("\nDump aborted\n");
361 else if (error == ENOSPC)
362 printf("\nDump failed. Partition too small.\n");
363 else
364 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
365 }
366
367 void
368 dump_add_page(vm_paddr_t pa)
369 {
370 int idx, bit;
371
372 pa >>= PAGE_SHIFT;
373 idx = pa >> 5; /* 2^5 = 32 */
374 bit = pa & 31;
375 atomic_set_int(&vm_page_dump[idx], 1ul << bit);
376 }
377
378 void
379 dump_drop_page(vm_paddr_t pa)
380 {
381 int idx, bit;
382
383 pa >>= PAGE_SHIFT;
384 idx = pa >> 5; /* 2^5 = 32 */
385 bit = pa & 31;
386 atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
387 }
388
Cache object: 5ec4ceca31e49b392480ae5b8c6b4973
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