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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
56d611a0 MS |
2 | /* |
3 | * RAM Oops/Panic logger | |
4 | * | |
5 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> | |
9ba80d99 | 6 | * Copyright (C) 2011 Kees Cook <keescook@chromium.org> |
56d611a0 MS |
7 | */ |
8 | ||
0169256e MS |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
56d611a0 | 11 | #include <linux/kernel.h> |
83c1b317 | 12 | #include <linux/err.h> |
56d611a0 | 13 | #include <linux/module.h> |
cbe7cbf5 | 14 | #include <linux/version.h> |
9ba80d99 | 15 | #include <linux/pstore.h> |
56d611a0 MS |
16 | #include <linux/io.h> |
17 | #include <linux/ioport.h> | |
c3b92ce9 | 18 | #include <linux/platform_device.h> |
13aefd72 | 19 | #include <linux/slab.h> |
24203036 | 20 | #include <linux/compiler.h> |
1894a253 | 21 | #include <linux/pstore_ram.h> |
35da6094 GH |
22 | #include <linux/of.h> |
23 | #include <linux/of_address.h> | |
16a58307 | 24 | #include "internal.h" |
56d611a0 MS |
25 | |
26 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 27 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 28 | |
3e5c4fad SI |
29 | static ulong record_size = MIN_MEM_SIZE; |
30 | module_param(record_size, ulong, 0400); | |
31 | MODULE_PARM_DESC(record_size, | |
32 | "size of each dump done on oops/panic"); | |
56d611a0 | 33 | |
b5d38e9b AV |
34 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
35 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
36 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
37 | ||
a694d1b5 AV |
38 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
39 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
40 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
41 | ||
9d5438f4 MS |
42 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
43 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
44 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
45 | ||
764fd639 | 46 | static unsigned long long mem_address; |
b90fe0c4 | 47 | module_param_hw(mem_address, ullong, other, 0400); |
56d611a0 MS |
48 | MODULE_PARM_DESC(mem_address, |
49 | "start of reserved RAM used to store oops/panic logs"); | |
50 | ||
51 | static ulong mem_size; | |
52 | module_param(mem_size, ulong, 0400); | |
53 | MODULE_PARM_DESC(mem_size, | |
54 | "size of reserved RAM used to store oops/panic logs"); | |
55 | ||
027bc8b0 | 56 | static unsigned int mem_type; |
f858b57f | 57 | module_param(mem_type, uint, 0400); |
027bc8b0 TL |
58 | MODULE_PARM_DESC(mem_type, |
59 | "set to 1 to try to use unbuffered memory (default 0)"); | |
60 | ||
791205e3 KC |
61 | static int ramoops_max_reason = -1; |
62 | module_param_named(max_reason, ramoops_max_reason, int, 0400); | |
63 | MODULE_PARM_DESC(max_reason, | |
64 | "maximum reason for kmsg dump (default 2: Oops and Panic) "); | |
56d611a0 | 65 | |
39eb7e97 | 66 | static int ramoops_ecc; |
f858b57f | 67 | module_param_named(ecc, ramoops_ecc, int, 0400); |
39eb7e97 | 68 | MODULE_PARM_DESC(ramoops_ecc, |
5ca5d4e6 AV |
69 | "if non-zero, the option enables ECC support and specifies " |
70 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
71 | "bytes ECC)"); | |
39eb7e97 | 72 | |
791205e3 KC |
73 | static int ramoops_dump_oops = -1; |
74 | module_param_named(dump_oops, ramoops_dump_oops, int, 0400); | |
75 | MODULE_PARM_DESC(dump_oops, | |
76 | "(deprecated: use max_reason instead) set to 1 to dump oopses & panics, 0 to only dump panics"); | |
77 | ||
9ba80d99 | 78 | struct ramoops_context { |
a5d23b95 KC |
79 | struct persistent_ram_zone **dprzs; /* Oops dump zones */ |
80 | struct persistent_ram_zone *cprz; /* Console zone */ | |
81 | struct persistent_ram_zone **fprzs; /* Ftrace zones */ | |
82 | struct persistent_ram_zone *mprz; /* PMSG zone */ | |
56d611a0 MS |
83 | phys_addr_t phys_addr; |
84 | unsigned long size; | |
027bc8b0 | 85 | unsigned int memtype; |
9ba80d99 | 86 | size_t record_size; |
b5d38e9b | 87 | size_t console_size; |
a694d1b5 | 88 | size_t ftrace_size; |
9d5438f4 | 89 | size_t pmsg_size; |
a1cf53ac | 90 | u32 flags; |
c31ad081 | 91 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
92 | unsigned int max_dump_cnt; |
93 | unsigned int dump_write_cnt; | |
57fd8353 | 94 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 95 | unsigned int dump_read_cnt; |
b5d38e9b | 96 | unsigned int console_read_cnt; |
a1cf53ac | 97 | unsigned int max_ftrace_cnt; |
a694d1b5 | 98 | unsigned int ftrace_read_cnt; |
9d5438f4 | 99 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
100 | struct pstore_info pstore; |
101 | }; | |
56d611a0 | 102 | |
13aefd72 | 103 | static struct platform_device *dummy; |
13aefd72 | 104 | |
9ba80d99 KC |
105 | static int ramoops_pstore_open(struct pstore_info *psi) |
106 | { | |
107 | struct ramoops_context *cxt = psi->data; | |
108 | ||
cac2eb7b | 109 | cxt->dump_read_cnt = 0; |
b5d38e9b | 110 | cxt->console_read_cnt = 0; |
57fd8353 | 111 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 112 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
113 | return 0; |
114 | } | |
115 | ||
755d66b4 | 116 | static struct persistent_ram_zone * |
b05c9506 JFG |
117 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id, |
118 | struct pstore_record *record) | |
755d66b4 AV |
119 | { |
120 | struct persistent_ram_zone *prz; | |
755d66b4 | 121 | |
46418413 | 122 | /* Give up if we never existed or have hit the end. */ |
b05c9506 | 123 | if (!przs) |
755d66b4 AV |
124 | return NULL; |
125 | ||
b05c9506 | 126 | prz = przs[id]; |
b0aa931f LS |
127 | if (!prz) |
128 | return NULL; | |
755d66b4 | 129 | |
aa9a4a1e | 130 | /* Update old/shadowed buffer. */ |
6a4c9ab1 | 131 | if (prz->type == PSTORE_TYPE_DMESG) |
755d66b4 | 132 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
133 | |
134 | if (!persistent_ram_old_size(prz)) | |
135 | return NULL; | |
755d66b4 | 136 | |
b05c9506 JFG |
137 | record->type = prz->type; |
138 | record->id = id; | |
755d66b4 AV |
139 | |
140 | return prz; | |
141 | } | |
142 | ||
7aaa822e | 143 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time, |
3f8f80f0 AB |
144 | bool *compressed) |
145 | { | |
146 | char data_type; | |
a28726b4 | 147 | int header_length = 0; |
3f8f80f0 | 148 | |
e264abea AB |
149 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n", |
150 | (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type, | |
7aaa822e | 151 | &header_length) == 3) { |
83b8a3fb | 152 | time->tv_nsec *= 1000; |
3f8f80f0 AB |
153 | if (data_type == 'C') |
154 | *compressed = true; | |
155 | else | |
156 | *compressed = false; | |
e264abea AB |
157 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n", |
158 | (time64_t *)&time->tv_sec, &time->tv_nsec, | |
7aaa822e | 159 | &header_length) == 2) { |
83b8a3fb | 160 | time->tv_nsec *= 1000; |
7aaa822e | 161 | *compressed = false; |
3f8f80f0 AB |
162 | } else { |
163 | time->tv_sec = 0; | |
164 | time->tv_nsec = 0; | |
165 | *compressed = false; | |
166 | } | |
a28726b4 | 167 | return header_length; |
3f8f80f0 AB |
168 | } |
169 | ||
f44f9652 MS |
170 | static bool prz_ok(struct persistent_ram_zone *prz) |
171 | { | |
172 | return !!prz && !!(persistent_ram_old_size(prz) + | |
173 | persistent_ram_ecc_string(prz, NULL, 0)); | |
174 | } | |
175 | ||
125cc42b | 176 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
56d611a0 | 177 | { |
2fbea82b | 178 | ssize_t size = 0; |
125cc42b | 179 | struct ramoops_context *cxt = record->psi->data; |
e036bd33 BZ |
180 | struct persistent_ram_zone *prz = NULL; |
181 | int header_length = 0; | |
2fbea82b | 182 | bool free_prz = false; |
e036bd33 | 183 | |
125cc42b KC |
184 | /* |
185 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
e036bd33 BZ |
186 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
187 | * valid time stamps, so it is initialized to zero. | |
188 | */ | |
125cc42b KC |
189 | record->time.tv_sec = 0; |
190 | record->time.tv_nsec = 0; | |
191 | record->compressed = false; | |
e036bd33 BZ |
192 | |
193 | /* Find the next valid persistent_ram_zone for DMESG */ | |
194 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
b05c9506 JFG |
195 | prz = ramoops_get_next_prz(cxt->dprzs, cxt->dump_read_cnt++, |
196 | record); | |
e036bd33 BZ |
197 | if (!prz_ok(prz)) |
198 | continue; | |
199 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
125cc42b KC |
200 | &record->time, |
201 | &record->compressed); | |
e036bd33 BZ |
202 | /* Clear and skip this DMESG record if it has no valid header */ |
203 | if (!header_length) { | |
204 | persistent_ram_free_old(prz); | |
205 | persistent_ram_zap(prz); | |
206 | prz = NULL; | |
207 | } | |
208 | } | |
9ba80d99 | 209 | |
b05c9506 JFG |
210 | if (!prz_ok(prz) && !cxt->console_read_cnt++) |
211 | prz = ramoops_get_next_prz(&cxt->cprz, 0 /* single */, record); | |
2fbea82b | 212 | |
b05c9506 JFG |
213 | if (!prz_ok(prz) && !cxt->pmsg_read_cnt++) |
214 | prz = ramoops_get_next_prz(&cxt->mprz, 0 /* single */, record); | |
2fbea82b JF |
215 | |
216 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
46418413 | 217 | if (!prz_ok(prz)) { |
b05c9506 JFG |
218 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) && |
219 | !cxt->ftrace_read_cnt++) { | |
220 | prz = ramoops_get_next_prz(cxt->fprzs, 0 /* single */, | |
221 | record); | |
2fbea82b JF |
222 | } else { |
223 | /* | |
224 | * Build a new dummy record which combines all the | |
225 | * per-cpu records including metadata and ecc info. | |
226 | */ | |
227 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
228 | ||
229 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
230 | GFP_KERNEL); | |
231 | if (!tmp_prz) | |
232 | return -ENOMEM; | |
8665569e | 233 | prz = tmp_prz; |
2fbea82b JF |
234 | free_prz = true; |
235 | ||
236 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
237 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
b05c9506 | 238 | cxt->ftrace_read_cnt++, record); |
2fbea82b JF |
239 | |
240 | if (!prz_ok(prz_next)) | |
241 | continue; | |
242 | ||
243 | tmp_prz->ecc_info = prz_next->ecc_info; | |
244 | tmp_prz->corrected_bytes += | |
245 | prz_next->corrected_bytes; | |
246 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
df9bf19d | 247 | |
16a58307 KC |
248 | size = pstore_ftrace_combine_log( |
249 | &tmp_prz->old_log, | |
df9bf19d KC |
250 | &tmp_prz->old_log_size, |
251 | prz_next->old_log, | |
252 | prz_next->old_log_size); | |
2fbea82b JF |
253 | if (size) |
254 | goto out; | |
255 | } | |
125cc42b | 256 | record->id = 0; |
a1cf53ac JF |
257 | } |
258 | } | |
259 | ||
2fbea82b JF |
260 | if (!prz_ok(prz)) { |
261 | size = 0; | |
262 | goto out; | |
263 | } | |
896fc1f0 | 264 | |
e036bd33 | 265 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
266 | |
267 | /* ECC correction notice */ | |
125cc42b | 268 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 269 | |
125cc42b KC |
270 | record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
271 | if (record->buf == NULL) { | |
2fbea82b JF |
272 | size = -ENOMEM; |
273 | goto out; | |
274 | } | |
9ba80d99 | 275 | |
125cc42b KC |
276 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
277 | size); | |
2fbea82b | 278 | |
125cc42b KC |
279 | persistent_ram_ecc_string(prz, record->buf + size, |
280 | record->ecc_notice_size + 1); | |
bd08ec33 | 281 | |
2fbea82b JF |
282 | out: |
283 | if (free_prz) { | |
284 | kfree(prz->old_log); | |
285 | kfree(prz); | |
286 | } | |
287 | ||
8cfc8ddc | 288 | return size; |
9ba80d99 KC |
289 | } |
290 | ||
3f8f80f0 | 291 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
c7f3c595 | 292 | struct pstore_record *record) |
896fc1f0 | 293 | { |
93ee4b7d | 294 | char hdr[36]; /* "===="(4), %lld(20), "."(1), %06lu(6), "-%c\n"(3) */ |
896fc1f0 AV |
295 | size_t len; |
296 | ||
93ee4b7d KC |
297 | len = scnprintf(hdr, sizeof(hdr), |
298 | RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n", | |
e264abea | 299 | (time64_t)record->time.tv_sec, |
c7f3c595 KC |
300 | record->time.tv_nsec / 1000, |
301 | record->compressed ? 'C' : 'D'); | |
896fc1f0 | 302 | persistent_ram_write(prz, hdr, len); |
896fc1f0 AV |
303 | |
304 | return len; | |
305 | } | |
306 | ||
4c9ec219 | 307 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
9ba80d99 | 308 | { |
b10b4711 | 309 | struct ramoops_context *cxt = record->psi->data; |
c6289378 | 310 | struct persistent_ram_zone *prz; |
b10b4711 | 311 | size_t size, hlen; |
9ba80d99 | 312 | |
b10b4711 | 313 | if (record->type == PSTORE_TYPE_CONSOLE) { |
b5d38e9b AV |
314 | if (!cxt->cprz) |
315 | return -ENOMEM; | |
b10b4711 | 316 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
b5d38e9b | 317 | return 0; |
b10b4711 | 318 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
319 | int zonenum; |
320 | ||
321 | if (!cxt->fprzs) | |
a694d1b5 | 322 | return -ENOMEM; |
a1cf53ac JF |
323 | /* |
324 | * Choose zone by if we're using per-cpu buffers. | |
325 | */ | |
326 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
327 | zonenum = smp_processor_id(); | |
328 | else | |
329 | zonenum = 0; | |
330 | ||
b10b4711 KC |
331 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
332 | record->size); | |
a694d1b5 | 333 | return 0; |
b10b4711 | 334 | } else if (record->type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
335 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
336 | return -EINVAL; | |
b5d38e9b AV |
337 | } |
338 | ||
b10b4711 | 339 | if (record->type != PSTORE_TYPE_DMESG) |
9ba80d99 | 340 | return -EINVAL; |
56d611a0 | 341 | |
b10b4711 | 342 | /* |
791205e3 KC |
343 | * We could filter on record->reason here if we wanted to (which |
344 | * would duplicate what happened before the "max_reason" setting | |
345 | * was added), but that would defeat the purpose of a system | |
346 | * changing printk.always_kmsg_dump, so instead log everything that | |
347 | * the kmsg dumper sends us, since it should be doing the filtering | |
348 | * based on the combination of printk.always_kmsg_dump and our | |
349 | * requested "max_reason". | |
9ba80d99 | 350 | */ |
9ba80d99 | 351 | |
b10b4711 KC |
352 | /* |
353 | * Explicitly only take the first part of any new crash. | |
9ba80d99 KC |
354 | * If our buffer is larger than kmsg_bytes, this can never happen, |
355 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
356 | * report split across multiple records. | |
357 | */ | |
b10b4711 | 358 | if (record->part != 1) |
9ba80d99 | 359 | return -ENOSPC; |
56d611a0 | 360 | |
a5d23b95 | 361 | if (!cxt->dprzs) |
c6289378 AH |
362 | return -ENOSPC; |
363 | ||
a5d23b95 | 364 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 365 | |
9e5f1c19 AY |
366 | /* |
367 | * Since this is a new crash dump, we need to reset the buffer in | |
368 | * case it still has an old dump present. Without this, the new dump | |
369 | * will get appended, which would seriously confuse anything trying | |
370 | * to check dump file contents. Specifically, ramoops_read_kmsg_hdr() | |
371 | * expects to find a dump header in the beginning of buffer data, so | |
372 | * we must to reset the buffer values, in order to ensure that the | |
373 | * header will be written to the beginning of the buffer. | |
374 | */ | |
375 | persistent_ram_zap(prz); | |
376 | ||
b10b4711 | 377 | /* Build header and append record contents. */ |
c7f3c595 | 378 | hlen = ramoops_write_kmsg_hdr(prz, record); |
47afd7ae YH |
379 | if (!hlen) |
380 | return -ENOMEM; | |
381 | ||
b10b4711 | 382 | size = record->size; |
896fc1f0 AV |
383 | if (size + hlen > prz->buffer_size) |
384 | size = prz->buffer_size - hlen; | |
b10b4711 | 385 | persistent_ram_write(prz, record->buf, size); |
56d611a0 | 386 | |
cac2eb7b | 387 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
4c9ec219 KC |
392 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
393 | const char __user *buf) | |
5bf6d1b9 | 394 | { |
fdd03118 KC |
395 | if (record->type == PSTORE_TYPE_PMSG) { |
396 | struct ramoops_context *cxt = record->psi->data; | |
5bf6d1b9 MS |
397 | |
398 | if (!cxt->mprz) | |
399 | return -ENOMEM; | |
fdd03118 | 400 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
5bf6d1b9 MS |
401 | } |
402 | ||
403 | return -EINVAL; | |
404 | } | |
405 | ||
a61072aa | 406 | static int ramoops_pstore_erase(struct pstore_record *record) |
9ba80d99 | 407 | { |
a61072aa | 408 | struct ramoops_context *cxt = record->psi->data; |
b5d38e9b | 409 | struct persistent_ram_zone *prz; |
9ba80d99 | 410 | |
a61072aa | 411 | switch (record->type) { |
b5d38e9b | 412 | case PSTORE_TYPE_DMESG: |
a61072aa | 413 | if (record->id >= cxt->max_dump_cnt) |
b5d38e9b | 414 | return -EINVAL; |
a61072aa | 415 | prz = cxt->dprzs[record->id]; |
b5d38e9b AV |
416 | break; |
417 | case PSTORE_TYPE_CONSOLE: | |
418 | prz = cxt->cprz; | |
419 | break; | |
a694d1b5 | 420 | case PSTORE_TYPE_FTRACE: |
a61072aa | 421 | if (record->id >= cxt->max_ftrace_cnt) |
a1cf53ac | 422 | return -EINVAL; |
a61072aa | 423 | prz = cxt->fprzs[record->id]; |
a694d1b5 | 424 | break; |
9d5438f4 MS |
425 | case PSTORE_TYPE_PMSG: |
426 | prz = cxt->mprz; | |
427 | break; | |
b5d38e9b | 428 | default: |
9ba80d99 | 429 | return -EINVAL; |
b5d38e9b | 430 | } |
9ba80d99 | 431 | |
b5d38e9b AV |
432 | persistent_ram_free_old(prz); |
433 | persistent_ram_zap(prz); | |
9ba80d99 KC |
434 | |
435 | return 0; | |
56d611a0 MS |
436 | } |
437 | ||
9ba80d99 KC |
438 | static struct ramoops_context oops_cxt = { |
439 | .pstore = { | |
440 | .owner = THIS_MODULE, | |
441 | .name = "ramoops", | |
442 | .open = ramoops_pstore_open, | |
443 | .read = ramoops_pstore_read, | |
4c9ec219 KC |
444 | .write = ramoops_pstore_write, |
445 | .write_user = ramoops_pstore_write_user, | |
9ba80d99 KC |
446 | .erase = ramoops_pstore_erase, |
447 | }, | |
448 | }; | |
449 | ||
f4c5d242 AV |
450 | static void ramoops_free_przs(struct ramoops_context *cxt) |
451 | { | |
452 | int i; | |
453 | ||
a1cf53ac | 454 | /* Free dump PRZs */ |
a5d23b95 | 455 | if (cxt->dprzs) { |
a1cf53ac | 456 | for (i = 0; i < cxt->max_dump_cnt; i++) |
a5d23b95 | 457 | persistent_ram_free(cxt->dprzs[i]); |
f4c5d242 | 458 | |
a5d23b95 | 459 | kfree(cxt->dprzs); |
a1cf53ac JF |
460 | cxt->max_dump_cnt = 0; |
461 | } | |
4407de74 | 462 | |
a1cf53ac JF |
463 | /* Free ftrace PRZs */ |
464 | if (cxt->fprzs) { | |
465 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
466 | persistent_ram_free(cxt->fprzs[i]); | |
467 | kfree(cxt->fprzs); | |
468 | cxt->max_ftrace_cnt = 0; | |
469 | } | |
f4c5d242 AV |
470 | } |
471 | ||
c443a5f3 KC |
472 | static int ramoops_init_przs(const char *name, |
473 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
474 | struct persistent_ram_zone ***przs, |
475 | phys_addr_t *paddr, size_t mem_sz, | |
476 | ssize_t record_size, | |
477 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
478 | { |
479 | int err = -ENOMEM; | |
480 | int i; | |
de832092 KC |
481 | size_t zone_sz; |
482 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 483 | |
de832092 KC |
484 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
485 | if (mem_sz == 0 || record_size == 0) { | |
486 | *cnt = 0; | |
f4c5d242 | 487 | return 0; |
c6289378 AH |
488 | } |
489 | ||
de832092 KC |
490 | /* |
491 | * If we have a negative record size, calculate it based on | |
492 | * mem_sz / *cnt. If we have a positive record size, calculate | |
493 | * cnt from mem_sz / record_size. | |
494 | */ | |
495 | if (record_size < 0) { | |
496 | if (*cnt == 0) | |
497 | return 0; | |
498 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
499 | if (record_size == 0) { |
500 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
501 | name, mem_sz, *cnt); | |
de832092 | 502 | goto fail; |
c443a5f3 | 503 | } |
de832092 KC |
504 | } else { |
505 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
506 | if (*cnt == 0) { |
507 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
508 | name, mem_sz, record_size); | |
de832092 | 509 | goto fail; |
c443a5f3 | 510 | } |
de832092 | 511 | } |
f4c5d242 | 512 | |
de832092 | 513 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
514 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
515 | name, | |
de832092 KC |
516 | mem_sz, (unsigned long long)*paddr, |
517 | cxt->size, (unsigned long long)cxt->phys_addr); | |
518 | goto fail; | |
f4c5d242 AV |
519 | } |
520 | ||
de832092 | 521 | zone_sz = mem_sz / *cnt; |
c443a5f3 KC |
522 | if (!zone_sz) { |
523 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 524 | goto fail; |
c443a5f3 | 525 | } |
de832092 KC |
526 | |
527 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
528 | if (!prz_ar) | |
529 | goto fail; | |
530 | ||
531 | for (i = 0; i < *cnt; i++) { | |
1227daa4 KC |
532 | char *label; |
533 | ||
534 | if (*cnt == 1) | |
535 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); | |
536 | else | |
537 | label = kasprintf(GFP_KERNEL, "ramoops:%s(%d/%d)", | |
538 | name, i, *cnt - 1); | |
de832092 | 539 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, |
1227daa4 KC |
540 | &cxt->ecc_info, |
541 | cxt->memtype, flags, label); | |
e163fdb3 | 542 | kfree(label); |
de832092 KC |
543 | if (IS_ERR(prz_ar[i])) { |
544 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
545 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
546 | name, record_size, | |
547 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
548 | |
549 | while (i > 0) { | |
550 | i--; | |
de832092 | 551 | persistent_ram_free(prz_ar[i]); |
4407de74 | 552 | } |
de832092 KC |
553 | kfree(prz_ar); |
554 | goto fail; | |
f4c5d242 | 555 | } |
de832092 | 556 | *paddr += zone_sz; |
f0f23e54 | 557 | prz_ar[i]->type = pstore_name_to_type(name); |
f4c5d242 AV |
558 | } |
559 | ||
de832092 | 560 | *przs = prz_ar; |
f4c5d242 | 561 | return 0; |
de832092 KC |
562 | |
563 | fail: | |
564 | *cnt = 0; | |
f4c5d242 AV |
565 | return err; |
566 | } | |
567 | ||
c443a5f3 KC |
568 | static int ramoops_init_prz(const char *name, |
569 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
570 | struct persistent_ram_zone **prz, |
571 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b | 572 | { |
1227daa4 KC |
573 | char *label; |
574 | ||
b5d38e9b AV |
575 | if (!sz) |
576 | return 0; | |
577 | ||
c6289378 | 578 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
579 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
580 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 581 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 582 | return -ENOMEM; |
c6289378 | 583 | } |
b5d38e9b | 584 | |
1227daa4 | 585 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); |
663deb47 | 586 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
7684bd33 | 587 | cxt->memtype, PRZ_FLAG_ZAP_OLD, label); |
e163fdb3 | 588 | kfree(label); |
b5d38e9b AV |
589 | if (IS_ERR(*prz)) { |
590 | int err = PTR_ERR(*prz); | |
591 | ||
c443a5f3 KC |
592 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
593 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
594 | return err; |
595 | } | |
596 | ||
b5d38e9b | 597 | *paddr += sz; |
f0f23e54 | 598 | (*prz)->type = pstore_name_to_type(name); |
b5d38e9b AV |
599 | |
600 | return 0; | |
601 | } | |
602 | ||
26961d76 KC |
603 | /* Read a u32 from a dt property and make sure it's safe for an int. */ |
604 | static int ramoops_parse_dt_u32(struct platform_device *pdev, | |
605 | const char *propname, | |
606 | u32 default_value, u32 *value) | |
35da6094 GH |
607 | { |
608 | u32 val32 = 0; | |
609 | int ret; | |
610 | ||
611 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
26961d76 KC |
612 | if (ret == -EINVAL) { |
613 | /* field is missing, use default value. */ | |
614 | val32 = default_value; | |
615 | } else if (ret < 0) { | |
35da6094 GH |
616 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", |
617 | propname, ret); | |
618 | return ret; | |
619 | } | |
620 | ||
26961d76 | 621 | /* Sanity check our results. */ |
35da6094 GH |
622 | if (val32 > INT_MAX) { |
623 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
624 | return -EOVERFLOW; | |
625 | } | |
626 | ||
627 | *value = val32; | |
628 | return 0; | |
629 | } | |
630 | ||
631 | static int ramoops_parse_dt(struct platform_device *pdev, | |
632 | struct ramoops_platform_data *pdata) | |
633 | { | |
634 | struct device_node *of_node = pdev->dev.of_node; | |
1614e921 | 635 | struct device_node *parent_node; |
529182e2 | 636 | struct resource *res; |
35da6094 GH |
637 | u32 value; |
638 | int ret; | |
639 | ||
640 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
641 | ||
529182e2 KC |
642 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
643 | if (!res) { | |
35da6094 | 644 | dev_err(&pdev->dev, |
529182e2 KC |
645 | "failed to locate DT /reserved-memory resource\n"); |
646 | return -EINVAL; | |
35da6094 GH |
647 | } |
648 | ||
529182e2 KC |
649 | pdata->mem_size = resource_size(res); |
650 | pdata->mem_address = res->start; | |
35da6094 | 651 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
791205e3 KC |
652 | /* |
653 | * Setting "no-dump-oops" is deprecated and will be ignored if | |
654 | * "max_reason" is also specified. | |
655 | */ | |
656 | if (of_property_read_bool(of_node, "no-dump-oops")) | |
657 | pdata->max_reason = KMSG_DUMP_PANIC; | |
658 | else | |
659 | pdata->max_reason = KMSG_DUMP_OOPS; | |
35da6094 | 660 | |
26961d76 KC |
661 | #define parse_u32(name, field, default_value) { \ |
662 | ret = ramoops_parse_dt_u32(pdev, name, default_value, \ | |
663 | &value); \ | |
35da6094 GH |
664 | if (ret < 0) \ |
665 | return ret; \ | |
666 | field = value; \ | |
667 | } | |
668 | ||
26961d76 KC |
669 | parse_u32("record-size", pdata->record_size, 0); |
670 | parse_u32("console-size", pdata->console_size, 0); | |
671 | parse_u32("ftrace-size", pdata->ftrace_size, 0); | |
672 | parse_u32("pmsg-size", pdata->pmsg_size, 0); | |
673 | parse_u32("ecc-size", pdata->ecc_info.ecc_size, 0); | |
674 | parse_u32("flags", pdata->flags, 0); | |
791205e3 | 675 | parse_u32("max-reason", pdata->max_reason, pdata->max_reason); |
35da6094 | 676 | |
26961d76 | 677 | #undef parse_u32 |
35da6094 | 678 | |
1614e921 DA |
679 | /* |
680 | * Some old Chromebooks relied on the kernel setting the | |
681 | * console_size and pmsg_size to the record size since that's | |
682 | * what the downstream kernel did. These same Chromebooks had | |
683 | * "ramoops" straight under the root node which isn't | |
684 | * according to the current upstream bindings (though it was | |
685 | * arguably acceptable under a prior version of the bindings). | |
686 | * Let's make those old Chromebooks work by detecting that | |
687 | * we're not a child of "reserved-memory" and mimicking the | |
688 | * expected behavior. | |
689 | */ | |
690 | parent_node = of_get_parent(of_node); | |
691 | if (!of_node_name_eq(parent_node, "reserved-memory") && | |
692 | !pdata->console_size && !pdata->ftrace_size && | |
693 | !pdata->pmsg_size && !pdata->ecc_info.ecc_size) { | |
694 | pdata->console_size = pdata->record_size; | |
695 | pdata->pmsg_size = pdata->record_size; | |
696 | } | |
697 | of_node_put(parent_node); | |
698 | ||
35da6094 GH |
699 | return 0; |
700 | } | |
701 | ||
f568f6ca | 702 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 703 | { |
896fc1f0 | 704 | struct device *dev = &pdev->dev; |
35da6094 | 705 | struct ramoops_platform_data *pdata = dev->platform_data; |
5631e857 | 706 | struct ramoops_platform_data pdata_local; |
56d611a0 | 707 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
708 | size_t dump_mem_sz; |
709 | phys_addr_t paddr; | |
56d611a0 MS |
710 | int err = -EINVAL; |
711 | ||
fc46d4e4 KC |
712 | /* |
713 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
714 | * probes. |
715 | */ | |
fc46d4e4 KC |
716 | if (cxt->max_dump_cnt) { |
717 | pr_err("already initialized\n"); | |
9ba80d99 | 718 | goto fail_out; |
fc46d4e4 KC |
719 | } |
720 | ||
1e0f67a9 YH |
721 | if (dev_of_node(dev) && !pdata) { |
722 | pdata = &pdata_local; | |
723 | memset(pdata, 0, sizeof(*pdata)); | |
724 | ||
725 | err = ramoops_parse_dt(pdev, pdata); | |
726 | if (err < 0) | |
727 | goto fail_out; | |
728 | } | |
729 | ||
fc46d4e4 KC |
730 | /* Make sure we didn't get bogus platform data pointer. */ |
731 | if (!pdata) { | |
732 | pr_err("NULL platform data\n"); | |
733 | goto fail_out; | |
734 | } | |
9ba80d99 | 735 | |
a694d1b5 | 736 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 737 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 738 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 739 | "non-zero\n"); |
9ba80d99 | 740 | goto fail_out; |
56d611a0 MS |
741 | } |
742 | ||
3bd11cf5 | 743 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 744 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 745 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 746 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 747 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 748 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
749 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
750 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 751 | |
13aefd72 MS |
752 | cxt->size = pdata->mem_size; |
753 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 754 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 755 | cxt->record_size = pdata->record_size; |
b5d38e9b | 756 | cxt->console_size = pdata->console_size; |
a694d1b5 | 757 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 758 | cxt->pmsg_size = pdata->pmsg_size; |
a1cf53ac | 759 | cxt->flags = pdata->flags; |
c31ad081 | 760 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 761 | |
f4c5d242 | 762 | paddr = cxt->phys_addr; |
896fc1f0 | 763 | |
9d5438f4 MS |
764 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
765 | - cxt->pmsg_size; | |
f0f23e54 | 766 | err = ramoops_init_przs("dmesg", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
767 | dump_mem_sz, cxt->record_size, |
768 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b AV |
769 | if (err) |
770 | goto fail_out; | |
771 | ||
c443a5f3 | 772 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 773 | cxt->console_size, 0); |
b5d38e9b AV |
774 | if (err) |
775 | goto fail_init_cprz; | |
776 | ||
a1cf53ac JF |
777 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
778 | ? nr_cpu_ids | |
779 | : 1; | |
c443a5f3 KC |
780 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
781 | cxt->ftrace_size, -1, | |
782 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
783 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
784 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 AV |
785 | if (err) |
786 | goto fail_init_fprz; | |
787 | ||
c443a5f3 KC |
788 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
789 | cxt->pmsg_size, 0); | |
9d5438f4 MS |
790 | if (err) |
791 | goto fail_init_mprz; | |
792 | ||
9ba80d99 | 793 | cxt->pstore.data = cxt; |
b5d38e9b | 794 | /* |
8880fa32 KC |
795 | * Prepare frontend flags based on which areas are initialized. |
796 | * For ramoops_init_przs() cases, the "max count" variable tells | |
797 | * if there are regions present. For ramoops_init_prz() cases, | |
798 | * the single region size is how to check. | |
b5d38e9b | 799 | */ |
8880fa32 | 800 | cxt->pstore.flags = 0; |
791205e3 | 801 | if (cxt->max_dump_cnt) { |
8880fa32 | 802 | cxt->pstore.flags |= PSTORE_FLAGS_DMESG; |
791205e3 KC |
803 | cxt->pstore.max_reason = pdata->max_reason; |
804 | } | |
79d955af NK |
805 | if (cxt->console_size) |
806 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
8880fa32 | 807 | if (cxt->max_ftrace_cnt) |
79d955af NK |
808 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; |
809 | if (cxt->pmsg_size) | |
810 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 811 | |
8880fa32 KC |
812 | /* |
813 | * Since bufsize is only used for dmesg crash dumps, it | |
814 | * must match the size of the dprz record (after PRZ header | |
815 | * and ECC bytes have been accounted for). | |
816 | */ | |
817 | if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) { | |
818 | cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size; | |
819 | cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL); | |
820 | if (!cxt->pstore.buf) { | |
821 | pr_err("cannot allocate pstore crash dump buffer\n"); | |
822 | err = -ENOMEM; | |
823 | goto fail_clear; | |
824 | } | |
825 | } | |
826 | ||
9ba80d99 | 827 | err = pstore_register(&cxt->pstore); |
56d611a0 | 828 | if (err) { |
9ba80d99 | 829 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 830 | goto fail_buf; |
56d611a0 MS |
831 | } |
832 | ||
c755201e KC |
833 | /* |
834 | * Update the module parameter variables as well so they are visible | |
835 | * through /sys/module/ramoops/parameters/ | |
836 | */ | |
837 | mem_size = pdata->mem_size; | |
838 | mem_address = pdata->mem_address; | |
839 | record_size = pdata->record_size; | |
791205e3 | 840 | ramoops_max_reason = pdata->max_reason; |
62f269ef WL |
841 | ramoops_console_size = pdata->console_size; |
842 | ramoops_pmsg_size = pdata->pmsg_size; | |
843 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 844 | |
dc80b1ea | 845 | pr_info("using 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 846 | cxt->size, (unsigned long long)cxt->phys_addr, |
dc80b1ea | 847 | cxt->ecc_info.ecc_size); |
9ba80d99 | 848 | |
56d611a0 MS |
849 | return 0; |
850 | ||
9ba80d99 KC |
851 | fail_buf: |
852 | kfree(cxt->pstore.buf); | |
853 | fail_clear: | |
854 | cxt->pstore.bufsize = 0; | |
e976e564 | 855 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 856 | fail_init_mprz: |
a694d1b5 | 857 | fail_init_fprz: |
e976e564 | 858 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 859 | fail_init_cprz: |
f4c5d242 | 860 | ramoops_free_przs(cxt); |
9ba80d99 | 861 | fail_out: |
56d611a0 MS |
862 | return err; |
863 | } | |
864 | ||
ee1d2674 | 865 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
866 | { |
867 | struct ramoops_context *cxt = &oops_cxt; | |
868 | ||
ee1d2674 | 869 | pstore_unregister(&cxt->pstore); |
9ba80d99 | 870 | |
9ba80d99 KC |
871 | kfree(cxt->pstore.buf); |
872 | cxt->pstore.bufsize = 0; | |
873 | ||
ee1d2674 | 874 | persistent_ram_free(cxt->mprz); |
ee1d2674 GT |
875 | persistent_ram_free(cxt->cprz); |
876 | ramoops_free_przs(cxt); | |
877 | ||
c3b92ce9 | 878 | return 0; |
56d611a0 MS |
879 | } |
880 | ||
35da6094 GH |
881 | static const struct of_device_id dt_match[] = { |
882 | { .compatible = "ramoops" }, | |
883 | {} | |
884 | }; | |
885 | ||
c3b92ce9 | 886 | static struct platform_driver ramoops_driver = { |
924d3711 | 887 | .probe = ramoops_probe, |
ee1d2674 | 888 | .remove = ramoops_remove, |
c3b92ce9 | 889 | .driver = { |
35da6094 GH |
890 | .name = "ramoops", |
891 | .of_match_table = dt_match, | |
c3b92ce9 KP |
892 | }, |
893 | }; | |
894 | ||
bac6f6cd | 895 | static inline void ramoops_unregister_dummy(void) |
c3b92ce9 | 896 | { |
bac6f6cd KC |
897 | platform_device_unregister(dummy); |
898 | dummy = NULL; | |
bac6f6cd KC |
899 | } |
900 | ||
901 | static void __init ramoops_register_dummy(void) | |
902 | { | |
182ca6e0 YH |
903 | struct ramoops_platform_data pdata; |
904 | ||
bac6f6cd KC |
905 | /* |
906 | * Prepare a dummy platform data structure to carry the module | |
907 | * parameters. If mem_size isn't set, then there are no module | |
908 | * parameters, and we can skip this. | |
909 | */ | |
924d3711 AV |
910 | if (!mem_size) |
911 | return; | |
912 | ||
913 | pr_info("using module parameters\n"); | |
914 | ||
182ca6e0 YH |
915 | memset(&pdata, 0, sizeof(pdata)); |
916 | pdata.mem_size = mem_size; | |
917 | pdata.mem_address = mem_address; | |
918 | pdata.mem_type = mem_type; | |
919 | pdata.record_size = record_size; | |
920 | pdata.console_size = ramoops_console_size; | |
921 | pdata.ftrace_size = ramoops_ftrace_size; | |
922 | pdata.pmsg_size = ramoops_pmsg_size; | |
791205e3 KC |
923 | /* If "max_reason" is set, its value has priority over "dump_oops". */ |
924 | if (ramoops_max_reason >= 0) | |
925 | pdata.max_reason = ramoops_max_reason; | |
926 | /* Otherwise, if "dump_oops" is set, parse it into "max_reason". */ | |
927 | else if (ramoops_dump_oops != -1) | |
928 | pdata.max_reason = ramoops_dump_oops ? KMSG_DUMP_OOPS | |
929 | : KMSG_DUMP_PANIC; | |
930 | /* And if neither are explicitly set, use the default. */ | |
931 | else | |
932 | pdata.max_reason = KMSG_DUMP_OOPS; | |
182ca6e0 | 933 | pdata.flags = RAMOOPS_FLAG_FTRACE_PER_CPU; |
a1cf53ac | 934 | |
5ca5d4e6 AV |
935 | /* |
936 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
937 | * (using 1 byte for ECC isn't much of use anyway). | |
938 | */ | |
182ca6e0 | 939 | pdata.ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
940 | |
941 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
182ca6e0 | 942 | &pdata, sizeof(pdata)); |
924d3711 AV |
943 | if (IS_ERR(dummy)) { |
944 | pr_info("could not create platform device: %ld\n", | |
945 | PTR_ERR(dummy)); | |
bac6f6cd | 946 | dummy = NULL; |
924d3711 AV |
947 | } |
948 | } | |
949 | ||
950 | static int __init ramoops_init(void) | |
951 | { | |
bac6f6cd KC |
952 | int ret; |
953 | ||
924d3711 | 954 | ramoops_register_dummy(); |
bac6f6cd KC |
955 | ret = platform_driver_register(&ramoops_driver); |
956 | if (ret != 0) | |
957 | ramoops_unregister_dummy(); | |
958 | ||
959 | return ret; | |
c3b92ce9 | 960 | } |
41603165 | 961 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
962 | |
963 | static void __exit ramoops_exit(void) | |
964 | { | |
965 | platform_driver_unregister(&ramoops_driver); | |
bac6f6cd | 966 | ramoops_unregister_dummy(); |
c3b92ce9 | 967 | } |
56d611a0 MS |
968 | module_exit(ramoops_exit); |
969 | ||
970 | MODULE_LICENSE("GPL"); | |
971 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
972 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |