Commit | Line | Data |
---|---|---|
56d611a0 MS |
1 | /* |
2 | * RAM Oops/Panic logger | |
3 | * | |
4 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> | |
9ba80d99 | 5 | * Copyright (C) 2011 Kees Cook <keescook@chromium.org> |
56d611a0 MS |
6 | * |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
0169256e MS |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
56d611a0 | 25 | #include <linux/kernel.h> |
83c1b317 | 26 | #include <linux/err.h> |
56d611a0 | 27 | #include <linux/module.h> |
cbe7cbf5 | 28 | #include <linux/version.h> |
9ba80d99 | 29 | #include <linux/pstore.h> |
56d611a0 MS |
30 | #include <linux/time.h> |
31 | #include <linux/io.h> | |
32 | #include <linux/ioport.h> | |
c3b92ce9 | 33 | #include <linux/platform_device.h> |
13aefd72 | 34 | #include <linux/slab.h> |
24203036 | 35 | #include <linux/compiler.h> |
1894a253 | 36 | #include <linux/pstore_ram.h> |
35da6094 GH |
37 | #include <linux/of.h> |
38 | #include <linux/of_address.h> | |
56d611a0 MS |
39 | |
40 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 41 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 42 | |
3e5c4fad SI |
43 | static ulong record_size = MIN_MEM_SIZE; |
44 | module_param(record_size, ulong, 0400); | |
45 | MODULE_PARM_DESC(record_size, | |
46 | "size of each dump done on oops/panic"); | |
56d611a0 | 47 | |
b5d38e9b AV |
48 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
49 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
50 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
51 | ||
a694d1b5 AV |
52 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
53 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
54 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
55 | ||
9d5438f4 MS |
56 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
57 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
58 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
59 | ||
764fd639 WWNDU |
60 | static unsigned long long mem_address; |
61 | module_param(mem_address, ullong, 0400); | |
56d611a0 MS |
62 | MODULE_PARM_DESC(mem_address, |
63 | "start of reserved RAM used to store oops/panic logs"); | |
64 | ||
65 | static ulong mem_size; | |
66 | module_param(mem_size, ulong, 0400); | |
67 | MODULE_PARM_DESC(mem_size, | |
68 | "size of reserved RAM used to store oops/panic logs"); | |
69 | ||
027bc8b0 TL |
70 | static unsigned int mem_type; |
71 | module_param(mem_type, uint, 0600); | |
72 | MODULE_PARM_DESC(mem_type, | |
73 | "set to 1 to try to use unbuffered memory (default 0)"); | |
74 | ||
56d611a0 MS |
75 | static int dump_oops = 1; |
76 | module_param(dump_oops, int, 0600); | |
77 | MODULE_PARM_DESC(dump_oops, | |
78 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
79 | ||
39eb7e97 AV |
80 | static int ramoops_ecc; |
81 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
82 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
83 | "if non-zero, the option enables ECC support and specifies " |
84 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
85 | "bytes ECC)"); | |
39eb7e97 | 86 | |
9ba80d99 | 87 | struct ramoops_context { |
896fc1f0 | 88 | struct persistent_ram_zone **przs; |
b5d38e9b | 89 | struct persistent_ram_zone *cprz; |
a694d1b5 | 90 | struct persistent_ram_zone *fprz; |
9d5438f4 | 91 | struct persistent_ram_zone *mprz; |
56d611a0 MS |
92 | phys_addr_t phys_addr; |
93 | unsigned long size; | |
027bc8b0 | 94 | unsigned int memtype; |
9ba80d99 | 95 | size_t record_size; |
b5d38e9b | 96 | size_t console_size; |
a694d1b5 | 97 | size_t ftrace_size; |
9d5438f4 | 98 | size_t pmsg_size; |
6b4d2a27 | 99 | int dump_oops; |
c31ad081 | 100 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
101 | unsigned int max_dump_cnt; |
102 | unsigned int dump_write_cnt; | |
57fd8353 | 103 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 104 | unsigned int dump_read_cnt; |
b5d38e9b | 105 | unsigned int console_read_cnt; |
a694d1b5 | 106 | unsigned int ftrace_read_cnt; |
9d5438f4 | 107 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
108 | struct pstore_info pstore; |
109 | }; | |
56d611a0 | 110 | |
13aefd72 MS |
111 | static struct platform_device *dummy; |
112 | static struct ramoops_platform_data *dummy_data; | |
113 | ||
9ba80d99 KC |
114 | static int ramoops_pstore_open(struct pstore_info *psi) |
115 | { | |
116 | struct ramoops_context *cxt = psi->data; | |
117 | ||
cac2eb7b | 118 | cxt->dump_read_cnt = 0; |
b5d38e9b | 119 | cxt->console_read_cnt = 0; |
57fd8353 | 120 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 121 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
122 | return 0; |
123 | } | |
124 | ||
755d66b4 AV |
125 | static struct persistent_ram_zone * |
126 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
127 | u64 *id, | |
128 | enum pstore_type_id *typep, enum pstore_type_id type, | |
129 | bool update) | |
130 | { | |
131 | struct persistent_ram_zone *prz; | |
132 | int i = (*c)++; | |
133 | ||
134 | if (i >= max) | |
135 | return NULL; | |
136 | ||
137 | prz = przs[i]; | |
b0aa931f LS |
138 | if (!prz) |
139 | return NULL; | |
755d66b4 | 140 | |
aa9a4a1e LS |
141 | /* Update old/shadowed buffer. */ |
142 | if (update) | |
755d66b4 | 143 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
144 | |
145 | if (!persistent_ram_old_size(prz)) | |
146 | return NULL; | |
755d66b4 AV |
147 | |
148 | *typep = type; | |
149 | *id = i; | |
150 | ||
151 | return prz; | |
152 | } | |
153 | ||
a28726b4 | 154 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
3f8f80f0 AB |
155 | bool *compressed) |
156 | { | |
157 | char data_type; | |
a28726b4 | 158 | int header_length = 0; |
3f8f80f0 | 159 | |
a28726b4 BZ |
160 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
161 | &time->tv_nsec, &data_type, &header_length) == 3) { | |
3f8f80f0 AB |
162 | if (data_type == 'C') |
163 | *compressed = true; | |
164 | else | |
165 | *compressed = false; | |
a28726b4 BZ |
166 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
167 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { | |
3f8f80f0 AB |
168 | *compressed = false; |
169 | } else { | |
170 | time->tv_sec = 0; | |
171 | time->tv_nsec = 0; | |
172 | *compressed = false; | |
173 | } | |
a28726b4 | 174 | return header_length; |
3f8f80f0 AB |
175 | } |
176 | ||
f44f9652 MS |
177 | static bool prz_ok(struct persistent_ram_zone *prz) |
178 | { | |
179 | return !!prz && !!(persistent_ram_old_size(prz) + | |
180 | persistent_ram_ecc_string(prz, NULL, 0)); | |
181 | } | |
182 | ||
9ba80d99 | 183 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
755d4fe4 | 184 | int *count, struct timespec *time, |
9a4e1398 | 185 | char **buf, bool *compressed, |
8cfc8ddc | 186 | ssize_t *ecc_notice_size, |
9a4e1398 | 187 | struct pstore_info *psi) |
56d611a0 | 188 | { |
9ba80d99 | 189 | ssize_t size; |
9ba80d99 | 190 | struct ramoops_context *cxt = psi->data; |
e036bd33 BZ |
191 | struct persistent_ram_zone *prz = NULL; |
192 | int header_length = 0; | |
193 | ||
194 | /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
195 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have | |
196 | * valid time stamps, so it is initialized to zero. | |
197 | */ | |
198 | time->tv_sec = 0; | |
199 | time->tv_nsec = 0; | |
200 | *compressed = false; | |
201 | ||
202 | /* Find the next valid persistent_ram_zone for DMESG */ | |
203 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
204 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, | |
205 | cxt->max_dump_cnt, id, type, | |
206 | PSTORE_TYPE_DMESG, 1); | |
207 | if (!prz_ok(prz)) | |
208 | continue; | |
209 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
210 | time, compressed); | |
211 | /* Clear and skip this DMESG record if it has no valid header */ | |
212 | if (!header_length) { | |
213 | persistent_ram_free_old(prz); | |
214 | persistent_ram_zap(prz); | |
215 | prz = NULL; | |
216 | } | |
217 | } | |
9ba80d99 | 218 | |
f44f9652 | 219 | if (!prz_ok(prz)) |
b5d38e9b AV |
220 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, |
221 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
f44f9652 | 222 | if (!prz_ok(prz)) |
a694d1b5 AV |
223 | prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, |
224 | 1, id, type, PSTORE_TYPE_FTRACE, 0); | |
9d5438f4 MS |
225 | if (!prz_ok(prz)) |
226 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, | |
227 | 1, id, type, PSTORE_TYPE_PMSG, 0); | |
f44f9652 | 228 | if (!prz_ok(prz)) |
755d66b4 | 229 | return 0; |
896fc1f0 | 230 | |
e036bd33 | 231 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
232 | |
233 | /* ECC correction notice */ | |
8cfc8ddc | 234 | *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 235 | |
8cfc8ddc | 236 | *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL); |
9ba80d99 KC |
237 | if (*buf == NULL) |
238 | return -ENOMEM; | |
9ba80d99 | 239 | |
a28726b4 | 240 | memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); |
8cfc8ddc | 241 | persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1); |
bd08ec33 | 242 | |
8cfc8ddc | 243 | return size; |
9ba80d99 KC |
244 | } |
245 | ||
3f8f80f0 AB |
246 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
247 | bool compressed) | |
896fc1f0 AV |
248 | { |
249 | char *hdr; | |
1e817fb6 | 250 | struct timespec timestamp; |
896fc1f0 AV |
251 | size_t len; |
252 | ||
1e817fb6 KC |
253 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
254 | if (__getnstimeofday(×tamp)) { | |
255 | timestamp.tv_sec = 0; | |
256 | timestamp.tv_nsec = 0; | |
257 | } | |
3f8f80f0 AB |
258 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
259 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
260 | compressed ? 'C' : 'D'); | |
896fc1f0 AV |
261 | WARN_ON_ONCE(!hdr); |
262 | len = hdr ? strlen(hdr) : 0; | |
263 | persistent_ram_write(prz, hdr, len); | |
264 | kfree(hdr); | |
265 | ||
266 | return len; | |
267 | } | |
268 | ||
24203036 AV |
269 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
270 | enum kmsg_dump_reason reason, | |
271 | u64 *id, unsigned int part, | |
6bbbca73 | 272 | const char *buf, |
b3b515bb | 273 | bool compressed, size_t size, |
24203036 | 274 | struct pstore_info *psi) |
9ba80d99 | 275 | { |
9ba80d99 | 276 | struct ramoops_context *cxt = psi->data; |
c6289378 | 277 | struct persistent_ram_zone *prz; |
896fc1f0 | 278 | size_t hlen; |
9ba80d99 | 279 | |
b5d38e9b AV |
280 | if (type == PSTORE_TYPE_CONSOLE) { |
281 | if (!cxt->cprz) | |
282 | return -ENOMEM; | |
c2b71132 | 283 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 284 | return 0; |
a694d1b5 AV |
285 | } else if (type == PSTORE_TYPE_FTRACE) { |
286 | if (!cxt->fprz) | |
287 | return -ENOMEM; | |
288 | persistent_ram_write(cxt->fprz, buf, size); | |
289 | return 0; | |
9d5438f4 MS |
290 | } else if (type == PSTORE_TYPE_PMSG) { |
291 | if (!cxt->mprz) | |
292 | return -ENOMEM; | |
293 | persistent_ram_write(cxt->mprz, buf, size); | |
294 | return 0; | |
b5d38e9b AV |
295 | } |
296 | ||
9ba80d99 KC |
297 | if (type != PSTORE_TYPE_DMESG) |
298 | return -EINVAL; | |
56d611a0 | 299 | |
9ba80d99 KC |
300 | /* Out of the various dmesg dump types, ramoops is currently designed |
301 | * to only store crash logs, rather than storing general kernel logs. | |
302 | */ | |
fc2d557c | 303 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 304 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 305 | return -EINVAL; |
fc2d557c | 306 | |
9ba80d99 | 307 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 308 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
309 | return -EINVAL; |
310 | ||
311 | /* Explicitly only take the first part of any new crash. | |
312 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
313 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
314 | * report split across multiple records. | |
315 | */ | |
316 | if (part != 1) | |
317 | return -ENOSPC; | |
56d611a0 | 318 | |
c6289378 AH |
319 | if (!cxt->przs) |
320 | return -ENOSPC; | |
321 | ||
322 | prz = cxt->przs[cxt->dump_write_cnt]; | |
323 | ||
3f8f80f0 | 324 | hlen = ramoops_write_kmsg_hdr(prz, compressed); |
896fc1f0 AV |
325 | if (size + hlen > prz->buffer_size) |
326 | size = prz->buffer_size - hlen; | |
c2b71132 | 327 | persistent_ram_write(prz, buf, size); |
56d611a0 | 328 | |
cac2eb7b | 329 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
330 | |
331 | return 0; | |
332 | } | |
333 | ||
755d4fe4 | 334 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 335 | struct timespec time, struct pstore_info *psi) |
9ba80d99 | 336 | { |
9ba80d99 | 337 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 338 | struct persistent_ram_zone *prz; |
9ba80d99 | 339 | |
b5d38e9b AV |
340 | switch (type) { |
341 | case PSTORE_TYPE_DMESG: | |
342 | if (id >= cxt->max_dump_cnt) | |
343 | return -EINVAL; | |
344 | prz = cxt->przs[id]; | |
345 | break; | |
346 | case PSTORE_TYPE_CONSOLE: | |
347 | prz = cxt->cprz; | |
348 | break; | |
a694d1b5 AV |
349 | case PSTORE_TYPE_FTRACE: |
350 | prz = cxt->fprz; | |
351 | break; | |
9d5438f4 MS |
352 | case PSTORE_TYPE_PMSG: |
353 | prz = cxt->mprz; | |
354 | break; | |
b5d38e9b | 355 | default: |
9ba80d99 | 356 | return -EINVAL; |
b5d38e9b | 357 | } |
9ba80d99 | 358 | |
b5d38e9b AV |
359 | persistent_ram_free_old(prz); |
360 | persistent_ram_zap(prz); | |
9ba80d99 KC |
361 | |
362 | return 0; | |
56d611a0 MS |
363 | } |
364 | ||
9ba80d99 KC |
365 | static struct ramoops_context oops_cxt = { |
366 | .pstore = { | |
367 | .owner = THIS_MODULE, | |
368 | .name = "ramoops", | |
369 | .open = ramoops_pstore_open, | |
370 | .read = ramoops_pstore_read, | |
c2b71132 | 371 | .write_buf = ramoops_pstore_write_buf, |
9ba80d99 KC |
372 | .erase = ramoops_pstore_erase, |
373 | }, | |
374 | }; | |
375 | ||
f4c5d242 AV |
376 | static void ramoops_free_przs(struct ramoops_context *cxt) |
377 | { | |
378 | int i; | |
379 | ||
34f0ec82 | 380 | cxt->max_dump_cnt = 0; |
f4c5d242 AV |
381 | if (!cxt->przs) |
382 | return; | |
383 | ||
90b58d96 | 384 | for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++) |
f4c5d242 AV |
385 | persistent_ram_free(cxt->przs[i]); |
386 | kfree(cxt->przs); | |
387 | } | |
388 | ||
f568f6ca GKH |
389 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, |
390 | phys_addr_t *paddr, size_t dump_mem_sz) | |
f4c5d242 AV |
391 | { |
392 | int err = -ENOMEM; | |
393 | int i; | |
394 | ||
395 | if (!cxt->record_size) | |
396 | return 0; | |
397 | ||
c6289378 AH |
398 | if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { |
399 | dev_err(dev, "no room for dumps\n"); | |
400 | return -ENOMEM; | |
401 | } | |
402 | ||
f4c5d242 AV |
403 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; |
404 | if (!cxt->max_dump_cnt) | |
405 | return -ENOMEM; | |
406 | ||
407 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
408 | GFP_KERNEL); | |
409 | if (!cxt->przs) { | |
410 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
34f0ec82 | 411 | goto fail_prz; |
f4c5d242 AV |
412 | } |
413 | ||
414 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
07239fc8 | 415 | cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0, |
027bc8b0 TL |
416 | &cxt->ecc_info, |
417 | cxt->memtype); | |
f4c5d242 AV |
418 | if (IS_ERR(cxt->przs[i])) { |
419 | err = PTR_ERR(cxt->przs[i]); | |
420 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
07239fc8 | 421 | cxt->record_size, (unsigned long long)*paddr, err); |
f4c5d242 AV |
422 | goto fail_prz; |
423 | } | |
07239fc8 | 424 | *paddr += cxt->record_size; |
f4c5d242 AV |
425 | } |
426 | ||
427 | return 0; | |
428 | fail_prz: | |
429 | ramoops_free_przs(cxt); | |
430 | return err; | |
431 | } | |
432 | ||
f568f6ca GKH |
433 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
434 | struct persistent_ram_zone **prz, | |
435 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
436 | { |
437 | if (!sz) | |
438 | return 0; | |
439 | ||
c6289378 AH |
440 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
441 | dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
442 | sz, (unsigned long long)*paddr, | |
443 | cxt->size, (unsigned long long)cxt->phys_addr); | |
b5d38e9b | 444 | return -ENOMEM; |
c6289378 | 445 | } |
b5d38e9b | 446 | |
027bc8b0 | 447 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype); |
b5d38e9b AV |
448 | if (IS_ERR(*prz)) { |
449 | int err = PTR_ERR(*prz); | |
450 | ||
451 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
452 | sz, (unsigned long long)*paddr, err); | |
453 | return err; | |
454 | } | |
455 | ||
456 | persistent_ram_zap(*prz); | |
457 | ||
458 | *paddr += sz; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
35da6094 GH |
463 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
464 | const char *propname, u32 *value) | |
465 | { | |
466 | u32 val32 = 0; | |
467 | int ret; | |
468 | ||
469 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
470 | if (ret < 0 && ret != -EINVAL) { | |
471 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
472 | propname, ret); | |
473 | return ret; | |
474 | } | |
475 | ||
476 | if (val32 > INT_MAX) { | |
477 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
478 | return -EOVERFLOW; | |
479 | } | |
480 | ||
481 | *value = val32; | |
482 | return 0; | |
483 | } | |
484 | ||
485 | static int ramoops_parse_dt(struct platform_device *pdev, | |
486 | struct ramoops_platform_data *pdata) | |
487 | { | |
488 | struct device_node *of_node = pdev->dev.of_node; | |
529182e2 | 489 | struct resource *res; |
35da6094 GH |
490 | u32 value; |
491 | int ret; | |
492 | ||
493 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
494 | ||
529182e2 KC |
495 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
496 | if (!res) { | |
35da6094 | 497 | dev_err(&pdev->dev, |
529182e2 KC |
498 | "failed to locate DT /reserved-memory resource\n"); |
499 | return -EINVAL; | |
35da6094 GH |
500 | } |
501 | ||
529182e2 KC |
502 | pdata->mem_size = resource_size(res); |
503 | pdata->mem_address = res->start; | |
35da6094 GH |
504 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
505 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
506 | ||
507 | #define parse_size(name, field) { \ | |
508 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
509 | if (ret < 0) \ | |
510 | return ret; \ | |
511 | field = value; \ | |
512 | } | |
513 | ||
514 | parse_size("record-size", pdata->record_size); | |
515 | parse_size("console-size", pdata->console_size); | |
516 | parse_size("ftrace-size", pdata->ftrace_size); | |
517 | parse_size("pmsg-size", pdata->pmsg_size); | |
518 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
519 | ||
520 | #undef parse_size | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
f568f6ca | 525 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 526 | { |
896fc1f0 | 527 | struct device *dev = &pdev->dev; |
35da6094 | 528 | struct ramoops_platform_data *pdata = dev->platform_data; |
56d611a0 | 529 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
530 | size_t dump_mem_sz; |
531 | phys_addr_t paddr; | |
56d611a0 MS |
532 | int err = -EINVAL; |
533 | ||
35da6094 GH |
534 | if (dev_of_node(dev) && !pdata) { |
535 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
536 | if (!pdata) { | |
537 | err = -ENOMEM; | |
538 | goto fail_out; | |
539 | } | |
540 | ||
541 | err = ramoops_parse_dt(pdev, pdata); | |
542 | if (err < 0) | |
543 | goto fail_out; | |
544 | } | |
545 | ||
9ba80d99 KC |
546 | /* Only a single ramoops area allowed at a time, so fail extra |
547 | * probes. | |
548 | */ | |
cac2eb7b | 549 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
550 | goto fail_out; |
551 | ||
a694d1b5 | 552 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 553 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 554 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 555 | "non-zero\n"); |
9ba80d99 | 556 | goto fail_out; |
56d611a0 MS |
557 | } |
558 | ||
3bd11cf5 | 559 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 560 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 561 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 562 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 563 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 564 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
565 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
566 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 567 | |
13aefd72 MS |
568 | cxt->size = pdata->mem_size; |
569 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 570 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 571 | cxt->record_size = pdata->record_size; |
b5d38e9b | 572 | cxt->console_size = pdata->console_size; |
a694d1b5 | 573 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 574 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 575 | cxt->dump_oops = pdata->dump_oops; |
c31ad081 | 576 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 577 | |
f4c5d242 | 578 | paddr = cxt->phys_addr; |
896fc1f0 | 579 | |
9d5438f4 MS |
580 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
581 | - cxt->pmsg_size; | |
f4c5d242 | 582 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
583 | if (err) |
584 | goto fail_out; | |
585 | ||
cbe7cbf5 AV |
586 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
587 | cxt->console_size, 0); | |
b5d38e9b AV |
588 | if (err) |
589 | goto fail_init_cprz; | |
590 | ||
cbe7cbf5 AV |
591 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
592 | LINUX_VERSION_CODE); | |
a694d1b5 AV |
593 | if (err) |
594 | goto fail_init_fprz; | |
595 | ||
9d5438f4 MS |
596 | err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0); |
597 | if (err) | |
598 | goto fail_init_mprz; | |
599 | ||
9ba80d99 | 600 | cxt->pstore.data = cxt; |
b5d38e9b | 601 | /* |
a384f641 AV |
602 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
603 | * have to handle dumps, we must have at least record_size buffer. And | |
604 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
605 | * ZERO_SIZE_PTR). | |
b5d38e9b | 606 | */ |
a384f641 AV |
607 | if (cxt->console_size) |
608 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
609 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 KC |
610 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
611 | spin_lock_init(&cxt->pstore.buf_lock); | |
612 | if (!cxt->pstore.buf) { | |
613 | pr_err("cannot allocate pstore buffer\n"); | |
47110b88 | 614 | err = -ENOMEM; |
9ba80d99 KC |
615 | goto fail_clear; |
616 | } | |
617 | ||
9ba80d99 | 618 | err = pstore_register(&cxt->pstore); |
56d611a0 | 619 | if (err) { |
9ba80d99 | 620 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 621 | goto fail_buf; |
56d611a0 MS |
622 | } |
623 | ||
c755201e KC |
624 | /* |
625 | * Update the module parameter variables as well so they are visible | |
626 | * through /sys/module/ramoops/parameters/ | |
627 | */ | |
628 | mem_size = pdata->mem_size; | |
629 | mem_address = pdata->mem_address; | |
630 | record_size = pdata->record_size; | |
631 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
632 | ramoops_console_size = pdata->console_size; |
633 | ramoops_pmsg_size = pdata->pmsg_size; | |
634 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 635 | |
c31ad081 | 636 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
d109a674 | 637 | cxt->size, (unsigned long long)cxt->phys_addr, |
c31ad081 | 638 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
9ba80d99 | 639 | |
56d611a0 MS |
640 | return 0; |
641 | ||
9ba80d99 KC |
642 | fail_buf: |
643 | kfree(cxt->pstore.buf); | |
644 | fail_clear: | |
645 | cxt->pstore.bufsize = 0; | |
e976e564 | 646 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 647 | fail_init_mprz: |
e976e564 | 648 | persistent_ram_free(cxt->fprz); |
a694d1b5 | 649 | fail_init_fprz: |
e976e564 | 650 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 651 | fail_init_cprz: |
f4c5d242 | 652 | ramoops_free_przs(cxt); |
9ba80d99 | 653 | fail_out: |
56d611a0 MS |
654 | return err; |
655 | } | |
656 | ||
ee1d2674 | 657 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
658 | { |
659 | struct ramoops_context *cxt = &oops_cxt; | |
660 | ||
ee1d2674 | 661 | pstore_unregister(&cxt->pstore); |
cac2eb7b | 662 | cxt->max_dump_cnt = 0; |
9ba80d99 | 663 | |
9ba80d99 KC |
664 | kfree(cxt->pstore.buf); |
665 | cxt->pstore.bufsize = 0; | |
666 | ||
ee1d2674 GT |
667 | persistent_ram_free(cxt->mprz); |
668 | persistent_ram_free(cxt->fprz); | |
669 | persistent_ram_free(cxt->cprz); | |
670 | ramoops_free_przs(cxt); | |
671 | ||
c3b92ce9 | 672 | return 0; |
56d611a0 MS |
673 | } |
674 | ||
35da6094 GH |
675 | static const struct of_device_id dt_match[] = { |
676 | { .compatible = "ramoops" }, | |
677 | {} | |
678 | }; | |
679 | ||
c3b92ce9 | 680 | static struct platform_driver ramoops_driver = { |
924d3711 | 681 | .probe = ramoops_probe, |
ee1d2674 | 682 | .remove = ramoops_remove, |
c3b92ce9 | 683 | .driver = { |
35da6094 GH |
684 | .name = "ramoops", |
685 | .of_match_table = dt_match, | |
c3b92ce9 KP |
686 | }, |
687 | }; | |
688 | ||
924d3711 | 689 | static void ramoops_register_dummy(void) |
c3b92ce9 | 690 | { |
924d3711 AV |
691 | if (!mem_size) |
692 | return; | |
693 | ||
694 | pr_info("using module parameters\n"); | |
695 | ||
696 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
697 | if (!dummy_data) { | |
698 | pr_info("could not allocate pdata\n"); | |
699 | return; | |
13aefd72 MS |
700 | } |
701 | ||
924d3711 AV |
702 | dummy_data->mem_size = mem_size; |
703 | dummy_data->mem_address = mem_address; | |
07855056 | 704 | dummy_data->mem_type = mem_type; |
924d3711 AV |
705 | dummy_data->record_size = record_size; |
706 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 707 | dummy_data->ftrace_size = ramoops_ftrace_size; |
9d5438f4 | 708 | dummy_data->pmsg_size = ramoops_pmsg_size; |
924d3711 | 709 | dummy_data->dump_oops = dump_oops; |
5ca5d4e6 AV |
710 | /* |
711 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
712 | * (using 1 byte for ECC isn't much of use anyway). | |
713 | */ | |
c31ad081 | 714 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
715 | |
716 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
717 | dummy_data, sizeof(struct ramoops_platform_data)); | |
718 | if (IS_ERR(dummy)) { | |
719 | pr_info("could not create platform device: %ld\n", | |
720 | PTR_ERR(dummy)); | |
721 | } | |
722 | } | |
723 | ||
724 | static int __init ramoops_init(void) | |
725 | { | |
726 | ramoops_register_dummy(); | |
727 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 728 | } |
924d3711 | 729 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
730 | |
731 | static void __exit ramoops_exit(void) | |
732 | { | |
733 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 734 | platform_device_unregister(dummy); |
13aefd72 | 735 | kfree(dummy_data); |
c3b92ce9 | 736 | } |
56d611a0 MS |
737 | module_exit(ramoops_exit); |
738 | ||
739 | MODULE_LICENSE("GPL"); | |
740 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
741 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |