1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010-2011 Aleksandr Rybalko <[email protected]>
5 * based on geom_redboot.c
6 * Copyright (c) 2009 Sam Leffler, Errno Consulting
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer,
14 * without modification.
15 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
16 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
17 * redistribution must be conditioned upon including a substantially
18 * similar Disclaimer requirement for further binary redistribution.
19 *
20 * NO WARRANTY
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
24 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
25 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
26 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
31 * THE POSSIBILITY OF SUCH DAMAGES.
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/errno.h>
40 #include <sys/endian.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/fcntl.h>
44 #include <sys/malloc.h>
45 #include <sys/bio.h>
46 #include <sys/lock.h>
47 #include <sys/mutex.h>
48 #include <sys/sbuf.h>
49
50 #include <geom/geom.h>
51 #include <geom/geom_slice.h>
52
53 #define MAP_CLASS_NAME "MAP"
54 #define MAP_MAXSLICE 64
55 #define MAP_MAX_MARKER_LEN 64
56
57 struct g_map_softc {
58 off_t offset[MAP_MAXSLICE]; /* offset in flash */
59 off_t size[MAP_MAXSLICE]; /* image size in bytes */
60 off_t entry[MAP_MAXSLICE];
61 off_t dsize[MAP_MAXSLICE];
62 uint8_t readonly[MAP_MAXSLICE];
63 g_access_t *parent_access;
64 };
65
66 static int
g_map_access(struct g_provider * pp,int dread,int dwrite,int dexcl)67 g_map_access(struct g_provider *pp, int dread, int dwrite, int dexcl)
68 {
69 struct g_geom *gp;
70 struct g_slicer *gsp;
71 struct g_map_softc *sc;
72
73 gp = pp->geom;
74 gsp = gp->softc;
75 sc = gsp->softc;
76
77 if (dwrite > 0 && sc->readonly[pp->index])
78 return (EPERM);
79
80 return (sc->parent_access(pp, dread, dwrite, dexcl));
81 }
82
83 static int
g_map_start(struct bio * bp)84 g_map_start(struct bio *bp)
85 {
86 struct g_provider *pp;
87 struct g_geom *gp;
88 struct g_map_softc *sc;
89 struct g_slicer *gsp;
90 int idx;
91
92 pp = bp->bio_to;
93 idx = pp->index;
94 gp = pp->geom;
95 gsp = gp->softc;
96 sc = gsp->softc;
97
98 if (bp->bio_cmd == BIO_GETATTR) {
99 if (g_handleattr_int(bp, MAP_CLASS_NAME "::entry",
100 sc->entry[idx])) {
101 return (1);
102 }
103 if (g_handleattr_int(bp, MAP_CLASS_NAME "::dsize",
104 sc->dsize[idx])) {
105 return (1);
106 }
107 }
108
109 return (0);
110 }
111
112 static void
g_map_dumpconf(struct sbuf * sb,const char * indent,struct g_geom * gp,struct g_consumer * cp __unused,struct g_provider * pp)113 g_map_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
114 struct g_consumer *cp __unused, struct g_provider *pp)
115 {
116 struct g_map_softc *sc;
117 struct g_slicer *gsp;
118
119 gsp = gp->softc;
120 sc = gsp->softc;
121 g_slice_dumpconf(sb, indent, gp, cp, pp);
122 if (pp != NULL) {
123 if (indent == NULL) {
124 sbuf_printf(sb, " entry %jd", (intmax_t)sc->entry[pp->index]);
125 sbuf_printf(sb, " dsize %jd", (intmax_t)sc->dsize[pp->index]);
126 } else {
127 sbuf_printf(sb, "%s<entry>%jd</entry>\n", indent,
128 (intmax_t)sc->entry[pp->index]);
129 sbuf_printf(sb, "%s<dsize>%jd</dsize>\n", indent,
130 (intmax_t)sc->dsize[pp->index]);
131 }
132 }
133 }
134
135 static int
find_marker(struct g_consumer * cp,const char * line,off_t * offset)136 find_marker(struct g_consumer *cp, const char *line, off_t *offset)
137 {
138 off_t search_start, search_offset, search_step;
139 size_t sectorsize;
140 uint8_t *buf;
141 char *op, key[MAP_MAX_MARKER_LEN], search_key[MAP_MAX_MARKER_LEN];
142 int ret, c;
143
144 /* Try convert to numeric first */
145 *offset = strtouq(line, &op, 0);
146 if (*op == '\0')
147 return (0);
148
149 bzero(search_key, MAP_MAX_MARKER_LEN);
150 sectorsize = cp->provider->sectorsize;
151
152 #ifdef __LP64__
153 ret = sscanf(line, "search:%li:%li:%63c",
154 &search_start, &search_step, search_key);
155 #else
156 ret = sscanf(line, "search:%qi:%qi:%63c",
157 &search_start, &search_step, search_key);
158 #endif
159 if (ret < 3)
160 return (1);
161
162 if (bootverbose) {
163 printf("MAP: search %s for key \"%s\" from 0x%jx, step 0x%jx\n",
164 cp->geom->name, search_key, (intmax_t)search_start, (intmax_t)search_step);
165 }
166
167 /* error if search_key is empty */
168 if (strlen(search_key) < 1)
169 return (1);
170
171 /* sscanf successful, and we start marker search */
172 for (search_offset = search_start;
173 search_offset < cp->provider->mediasize;
174 search_offset += search_step) {
175 g_topology_unlock();
176 buf = g_read_data(cp, rounddown(search_offset, sectorsize),
177 roundup(strlen(search_key), sectorsize), NULL);
178 g_topology_lock();
179
180 /*
181 * Don't bother doing the rest if buf==NULL; eg derefencing
182 * to assemble 'key'.
183 */
184 if (buf == NULL)
185 continue;
186
187 /* Wildcard, replace '.' with byte from data */
188 /* TODO: add support wildcard escape '\.' */
189
190 strncpy(key, search_key, MAP_MAX_MARKER_LEN);
191
192 for (c = 0; c < MAP_MAX_MARKER_LEN && key[c]; c++) {
193 if (key[c] == '.') {
194 key[c] = ((char *)(buf +
195 (search_offset % sectorsize)))[c];
196 }
197 }
198
199 /* Assume buf != NULL here */
200 if (memcmp(buf + search_offset % sectorsize,
201 key, strlen(search_key)) == 0) {
202 g_free(buf);
203 /* Marker found, so return their offset */
204 *offset = search_offset;
205 return (0);
206 }
207 g_free(buf);
208 }
209
210 /* Marker not found */
211 return (1);
212 }
213
214 static int
g_map_parse_part(struct g_class * mp,struct g_provider * pp,struct g_consumer * cp,struct g_geom * gp,struct g_map_softc * sc,int i)215 g_map_parse_part(struct g_class *mp, struct g_provider *pp,
216 struct g_consumer *cp, struct g_geom *gp, struct g_map_softc *sc, int i)
217 {
218 const char *value, *name;
219 char *op;
220 off_t start, end, offset, size, dsize;
221 int readonly, ret;
222
223 /* hint.map.0.at="cfid0" - bind to cfid0 media */
224 if (resource_string_value("map", i, "at", &value) != 0)
225 return (1);
226
227 /* Check if this correct provider */
228 if (strcmp(pp->name, value) != 0)
229 return (1);
230
231 /*
232 * hint.map.0.name="uboot" - name of partition, will be available
233 * as "/dev/map/uboot"
234 */
235 if (resource_string_value("map", i, "name", &name) != 0) {
236 if (bootverbose)
237 printf("MAP: hint.map.%d has no name\n", i);
238 return (1);
239 }
240
241 /*
242 * hint.map.0.start="0x00010000" - partition start at 0x00010000
243 * or hint.map.0.start="search:0x00010000:0x200:marker text" -
244 * search for text "marker text", begin at 0x10000, step 0x200
245 * until we found marker or end of media reached
246 */
247 if (resource_string_value("map", i, "start", &value) != 0) {
248 if (bootverbose)
249 printf("MAP: \"%s\" has no start value\n", name);
250 return (1);
251 }
252 if (find_marker(cp, value, &start) != 0) {
253 if (bootverbose) {
254 printf("MAP: \"%s\" can't parse/use start value\n",
255 name);
256 }
257 return (1);
258 }
259
260 /* like "start" */
261 if (resource_string_value("map", i, "end", &value) != 0) {
262 if (bootverbose)
263 printf("MAP: \"%s\" has no end value\n", name);
264 return (1);
265 }
266 if (find_marker(cp, value, &end) != 0) {
267 if (bootverbose) {
268 printf("MAP: \"%s\" can't parse/use end value\n",
269 name);
270 }
271 return (1);
272 }
273
274 /* variable readonly optional, disable write access */
275 if (resource_int_value("map", i, "readonly", &readonly) != 0)
276 readonly = 0;
277
278 /* offset of partition data, from partition begin */
279 if (resource_string_value("map", i, "offset", &value) == 0) {
280 offset = strtouq(value, &op, 0);
281 if (*op != '\0') {
282 if (bootverbose) {
283 printf("MAP: \"%s\" can't parse offset\n",
284 name);
285 }
286 return (1);
287 }
288 } else {
289 offset = 0;
290 }
291
292 /* partition data size */
293 if (resource_string_value("map", i, "dsize", &value) == 0) {
294 dsize = strtouq(value, &op, 0);
295 if (*op != '\0') {
296 if (bootverbose) {
297 printf("MAP: \"%s\" can't parse dsize\n",
298 name);
299 }
300 return (1);
301 }
302 } else {
303 dsize = 0;
304 }
305
306 size = end - start;
307 if (dsize == 0)
308 dsize = size - offset;
309
310 /* end is 0 or size is 0, No MAP - so next */
311 if (end < start) {
312 if (bootverbose) {
313 printf("MAP: \"%s\", \"end\" less than "
314 "\"start\"\n", name);
315 }
316 return (1);
317 }
318
319 if (offset + dsize > size) {
320 if (bootverbose) {
321 printf("MAP: \"%s\", \"dsize\" bigger than "
322 "partition - offset\n", name);
323 }
324 return (1);
325 }
326
327 ret = g_slice_config(gp, i, G_SLICE_CONFIG_SET, start + offset,
328 dsize, cp->provider->sectorsize, "map/%s", name);
329 if (ret != 0) {
330 if (bootverbose) {
331 printf("MAP: g_slice_config returns %d for \"%s\"\n",
332 ret, name);
333 }
334 return (1);
335 }
336
337 if (bootverbose) {
338 printf("MAP: %s: %jxx%jx, data=%jxx%jx "
339 "\"/dev/map/%s\"\n",
340 cp->geom->name, (intmax_t)start, (intmax_t)size, (intmax_t)offset,
341 (intmax_t)dsize, name);
342 }
343
344 sc->offset[i] = start;
345 sc->size[i] = size;
346 sc->entry[i] = offset;
347 sc->dsize[i] = dsize;
348 sc->readonly[i] = readonly ? 1 : 0;
349
350 return (0);
351 }
352
353 static struct g_geom *
g_map_taste(struct g_class * mp,struct g_provider * pp,int insist __unused)354 g_map_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
355 {
356 struct g_map_softc *sc;
357 struct g_consumer *cp;
358 struct g_geom *gp;
359 int i;
360
361 g_trace(G_T_TOPOLOGY, "map_taste(%s,%s)", mp->name, pp->name);
362 g_topology_assert();
363 if (strcmp(pp->geom->class->name, MAP_CLASS_NAME) == 0)
364 return (NULL);
365
366 gp = g_slice_new(mp, MAP_MAXSLICE, pp, &cp, &sc, sizeof(*sc),
367 g_map_start);
368 if (gp == NULL)
369 return (NULL);
370
371 /* interpose our access method */
372 sc->parent_access = gp->access;
373 gp->access = g_map_access;
374
375 for (i = 0; i < MAP_MAXSLICE; i++)
376 g_map_parse_part(mp, pp, cp, gp, sc, i);
377
378 g_access(cp, -1, 0, 0);
379 if (LIST_EMPTY(&gp->provider)) {
380 if (bootverbose)
381 printf("MAP: No valid partition found at %s\n", pp->name);
382 g_slice_spoiled(cp);
383 return (NULL);
384 }
385 return (gp);
386 }
387
388 static struct g_class g_map_class = {
389 .name = MAP_CLASS_NAME,
390 .version = G_VERSION,
391 .taste = g_map_taste,
392 .dumpconf = g_map_dumpconf,
393 };
394 DECLARE_GEOM_CLASS(g_map_class, g_map);
395 MODULE_VERSION(geom_map, 0);
396