Commit | Line | Data |
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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> |
35da6094 GH |
21 | #include <linux/of.h> |
22 | #include <linux/of_address.h> | |
104fd0b5 | 23 | #include <linux/mm.h> |
8bd4da0f | 24 | |
16a58307 | 25 | #include "internal.h" |
8bd4da0f | 26 | #include "ram_internal.h" |
56d611a0 MS |
27 | |
28 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 29 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 30 | |
3e5c4fad SI |
31 | static ulong record_size = MIN_MEM_SIZE; |
32 | module_param(record_size, ulong, 0400); | |
33 | MODULE_PARM_DESC(record_size, | |
34 | "size of each dump done on oops/panic"); | |
56d611a0 | 35 | |
b5d38e9b AV |
36 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
37 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
38 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
39 | ||
a694d1b5 AV |
40 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
41 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
42 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
43 | ||
9d5438f4 MS |
44 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
45 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
46 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
47 | ||
764fd639 | 48 | static unsigned long long mem_address; |
b90fe0c4 | 49 | module_param_hw(mem_address, ullong, other, 0400); |
56d611a0 MS |
50 | MODULE_PARM_DESC(mem_address, |
51 | "start of reserved RAM used to store oops/panic logs"); | |
52 | ||
53 | static ulong mem_size; | |
54 | module_param(mem_size, ulong, 0400); | |
55 | MODULE_PARM_DESC(mem_size, | |
56 | "size of reserved RAM used to store oops/panic logs"); | |
57 | ||
027bc8b0 | 58 | static unsigned int mem_type; |
f858b57f | 59 | module_param(mem_type, uint, 0400); |
027bc8b0 | 60 | MODULE_PARM_DESC(mem_type, |
9d843e8f | 61 | "memory type: 0=write-combined (default), 1=unbuffered, 2=cached"); |
027bc8b0 | 62 | |
791205e3 KC |
63 | static int ramoops_max_reason = -1; |
64 | module_param_named(max_reason, ramoops_max_reason, int, 0400); | |
65 | MODULE_PARM_DESC(max_reason, | |
66 | "maximum reason for kmsg dump (default 2: Oops and Panic) "); | |
56d611a0 | 67 | |
39eb7e97 | 68 | static int ramoops_ecc; |
f858b57f | 69 | module_param_named(ecc, ramoops_ecc, int, 0400); |
39eb7e97 | 70 | MODULE_PARM_DESC(ramoops_ecc, |
5ca5d4e6 AV |
71 | "if non-zero, the option enables ECC support and specifies " |
72 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
73 | "bytes ECC)"); | |
39eb7e97 | 74 | |
791205e3 KC |
75 | static int ramoops_dump_oops = -1; |
76 | module_param_named(dump_oops, ramoops_dump_oops, int, 0400); | |
77 | MODULE_PARM_DESC(dump_oops, | |
78 | "(deprecated: use max_reason instead) set to 1 to dump oopses & panics, 0 to only dump panics"); | |
79 | ||
9ba80d99 | 80 | struct ramoops_context { |
a5d23b95 KC |
81 | struct persistent_ram_zone **dprzs; /* Oops dump zones */ |
82 | struct persistent_ram_zone *cprz; /* Console zone */ | |
83 | struct persistent_ram_zone **fprzs; /* Ftrace zones */ | |
84 | struct persistent_ram_zone *mprz; /* PMSG zone */ | |
56d611a0 MS |
85 | phys_addr_t phys_addr; |
86 | unsigned long size; | |
027bc8b0 | 87 | unsigned int memtype; |
9ba80d99 | 88 | size_t record_size; |
b5d38e9b | 89 | size_t console_size; |
a694d1b5 | 90 | size_t ftrace_size; |
9d5438f4 | 91 | size_t pmsg_size; |
a1cf53ac | 92 | u32 flags; |
c31ad081 | 93 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
94 | unsigned int max_dump_cnt; |
95 | unsigned int dump_write_cnt; | |
57fd8353 | 96 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 97 | unsigned int dump_read_cnt; |
b5d38e9b | 98 | unsigned int console_read_cnt; |
a1cf53ac | 99 | unsigned int max_ftrace_cnt; |
a694d1b5 | 100 | unsigned int ftrace_read_cnt; |
9d5438f4 | 101 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
102 | struct pstore_info pstore; |
103 | }; | |
56d611a0 | 104 | |
13aefd72 | 105 | static struct platform_device *dummy; |
13aefd72 | 106 | |
9ba80d99 KC |
107 | static int ramoops_pstore_open(struct pstore_info *psi) |
108 | { | |
109 | struct ramoops_context *cxt = psi->data; | |
110 | ||
cac2eb7b | 111 | cxt->dump_read_cnt = 0; |
b5d38e9b | 112 | cxt->console_read_cnt = 0; |
57fd8353 | 113 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 114 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
115 | return 0; |
116 | } | |
117 | ||
755d66b4 | 118 | static struct persistent_ram_zone * |
b05c9506 JFG |
119 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id, |
120 | struct pstore_record *record) | |
755d66b4 AV |
121 | { |
122 | struct persistent_ram_zone *prz; | |
755d66b4 | 123 | |
46418413 | 124 | /* Give up if we never existed or have hit the end. */ |
b05c9506 | 125 | if (!przs) |
755d66b4 AV |
126 | return NULL; |
127 | ||
b05c9506 | 128 | prz = przs[id]; |
b0aa931f LS |
129 | if (!prz) |
130 | return NULL; | |
755d66b4 | 131 | |
aa9a4a1e | 132 | /* Update old/shadowed buffer. */ |
6a4c9ab1 | 133 | if (prz->type == PSTORE_TYPE_DMESG) |
755d66b4 | 134 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
135 | |
136 | if (!persistent_ram_old_size(prz)) | |
137 | return NULL; | |
755d66b4 | 138 | |
b05c9506 JFG |
139 | record->type = prz->type; |
140 | record->id = id; | |
755d66b4 AV |
141 | |
142 | return prz; | |
143 | } | |
144 | ||
7aaa822e | 145 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time, |
3f8f80f0 AB |
146 | bool *compressed) |
147 | { | |
148 | char data_type; | |
a28726b4 | 149 | int header_length = 0; |
3f8f80f0 | 150 | |
e264abea AB |
151 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n", |
152 | (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type, | |
7aaa822e | 153 | &header_length) == 3) { |
83b8a3fb | 154 | time->tv_nsec *= 1000; |
3f8f80f0 AB |
155 | if (data_type == 'C') |
156 | *compressed = true; | |
157 | else | |
158 | *compressed = false; | |
e264abea AB |
159 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n", |
160 | (time64_t *)&time->tv_sec, &time->tv_nsec, | |
7aaa822e | 161 | &header_length) == 2) { |
83b8a3fb | 162 | time->tv_nsec *= 1000; |
7aaa822e | 163 | *compressed = false; |
3f8f80f0 AB |
164 | } else { |
165 | time->tv_sec = 0; | |
166 | time->tv_nsec = 0; | |
167 | *compressed = false; | |
168 | } | |
a28726b4 | 169 | return header_length; |
3f8f80f0 AB |
170 | } |
171 | ||
f44f9652 MS |
172 | static bool prz_ok(struct persistent_ram_zone *prz) |
173 | { | |
174 | return !!prz && !!(persistent_ram_old_size(prz) + | |
175 | persistent_ram_ecc_string(prz, NULL, 0)); | |
176 | } | |
177 | ||
125cc42b | 178 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
56d611a0 | 179 | { |
2fbea82b | 180 | ssize_t size = 0; |
125cc42b | 181 | struct ramoops_context *cxt = record->psi->data; |
e036bd33 BZ |
182 | struct persistent_ram_zone *prz = NULL; |
183 | int header_length = 0; | |
2fbea82b | 184 | bool free_prz = false; |
e036bd33 | 185 | |
125cc42b KC |
186 | /* |
187 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
e036bd33 BZ |
188 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
189 | * valid time stamps, so it is initialized to zero. | |
190 | */ | |
125cc42b KC |
191 | record->time.tv_sec = 0; |
192 | record->time.tv_nsec = 0; | |
193 | record->compressed = false; | |
e036bd33 BZ |
194 | |
195 | /* Find the next valid persistent_ram_zone for DMESG */ | |
196 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
b05c9506 JFG |
197 | prz = ramoops_get_next_prz(cxt->dprzs, cxt->dump_read_cnt++, |
198 | record); | |
e036bd33 BZ |
199 | if (!prz_ok(prz)) |
200 | continue; | |
201 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
125cc42b KC |
202 | &record->time, |
203 | &record->compressed); | |
e036bd33 BZ |
204 | /* Clear and skip this DMESG record if it has no valid header */ |
205 | if (!header_length) { | |
206 | persistent_ram_free_old(prz); | |
207 | persistent_ram_zap(prz); | |
208 | prz = NULL; | |
209 | } | |
210 | } | |
9ba80d99 | 211 | |
b05c9506 JFG |
212 | if (!prz_ok(prz) && !cxt->console_read_cnt++) |
213 | prz = ramoops_get_next_prz(&cxt->cprz, 0 /* single */, record); | |
2fbea82b | 214 | |
b05c9506 JFG |
215 | if (!prz_ok(prz) && !cxt->pmsg_read_cnt++) |
216 | prz = ramoops_get_next_prz(&cxt->mprz, 0 /* single */, record); | |
2fbea82b JF |
217 | |
218 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
46418413 | 219 | if (!prz_ok(prz)) { |
b05c9506 JFG |
220 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) && |
221 | !cxt->ftrace_read_cnt++) { | |
222 | prz = ramoops_get_next_prz(cxt->fprzs, 0 /* single */, | |
223 | record); | |
2fbea82b JF |
224 | } else { |
225 | /* | |
226 | * Build a new dummy record which combines all the | |
227 | * per-cpu records including metadata and ecc info. | |
228 | */ | |
229 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
230 | ||
231 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
232 | GFP_KERNEL); | |
233 | if (!tmp_prz) | |
234 | return -ENOMEM; | |
8665569e | 235 | prz = tmp_prz; |
2fbea82b JF |
236 | free_prz = true; |
237 | ||
238 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
239 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
b05c9506 | 240 | cxt->ftrace_read_cnt++, record); |
2fbea82b JF |
241 | |
242 | if (!prz_ok(prz_next)) | |
243 | continue; | |
244 | ||
245 | tmp_prz->ecc_info = prz_next->ecc_info; | |
246 | tmp_prz->corrected_bytes += | |
247 | prz_next->corrected_bytes; | |
248 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
df9bf19d | 249 | |
16a58307 KC |
250 | size = pstore_ftrace_combine_log( |
251 | &tmp_prz->old_log, | |
df9bf19d KC |
252 | &tmp_prz->old_log_size, |
253 | prz_next->old_log, | |
254 | prz_next->old_log_size); | |
2fbea82b JF |
255 | if (size) |
256 | goto out; | |
257 | } | |
125cc42b | 258 | record->id = 0; |
a1cf53ac JF |
259 | } |
260 | } | |
261 | ||
2fbea82b JF |
262 | if (!prz_ok(prz)) { |
263 | size = 0; | |
264 | goto out; | |
265 | } | |
896fc1f0 | 266 | |
e036bd33 | 267 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
268 | |
269 | /* ECC correction notice */ | |
125cc42b | 270 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 271 | |
104fd0b5 | 272 | record->buf = kvzalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
125cc42b | 273 | if (record->buf == NULL) { |
2fbea82b JF |
274 | size = -ENOMEM; |
275 | goto out; | |
276 | } | |
9ba80d99 | 277 | |
125cc42b KC |
278 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
279 | size); | |
2fbea82b | 280 | |
125cc42b KC |
281 | persistent_ram_ecc_string(prz, record->buf + size, |
282 | record->ecc_notice_size + 1); | |
bd08ec33 | 283 | |
2fbea82b JF |
284 | out: |
285 | if (free_prz) { | |
104fd0b5 | 286 | kvfree(prz->old_log); |
2fbea82b JF |
287 | kfree(prz); |
288 | } | |
289 | ||
8cfc8ddc | 290 | return size; |
9ba80d99 KC |
291 | } |
292 | ||
3f8f80f0 | 293 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
c7f3c595 | 294 | struct pstore_record *record) |
896fc1f0 | 295 | { |
93ee4b7d | 296 | char hdr[36]; /* "===="(4), %lld(20), "."(1), %06lu(6), "-%c\n"(3) */ |
896fc1f0 AV |
297 | size_t len; |
298 | ||
93ee4b7d KC |
299 | len = scnprintf(hdr, sizeof(hdr), |
300 | RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n", | |
e264abea | 301 | (time64_t)record->time.tv_sec, |
c7f3c595 KC |
302 | record->time.tv_nsec / 1000, |
303 | record->compressed ? 'C' : 'D'); | |
896fc1f0 | 304 | persistent_ram_write(prz, hdr, len); |
896fc1f0 AV |
305 | |
306 | return len; | |
307 | } | |
308 | ||
4c9ec219 | 309 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
9ba80d99 | 310 | { |
b10b4711 | 311 | struct ramoops_context *cxt = record->psi->data; |
c6289378 | 312 | struct persistent_ram_zone *prz; |
b10b4711 | 313 | size_t size, hlen; |
9ba80d99 | 314 | |
b10b4711 | 315 | if (record->type == PSTORE_TYPE_CONSOLE) { |
b5d38e9b AV |
316 | if (!cxt->cprz) |
317 | return -ENOMEM; | |
b10b4711 | 318 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
b5d38e9b | 319 | return 0; |
b10b4711 | 320 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
321 | int zonenum; |
322 | ||
323 | if (!cxt->fprzs) | |
a694d1b5 | 324 | return -ENOMEM; |
a1cf53ac JF |
325 | /* |
326 | * Choose zone by if we're using per-cpu buffers. | |
327 | */ | |
328 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
329 | zonenum = smp_processor_id(); | |
330 | else | |
331 | zonenum = 0; | |
332 | ||
b10b4711 KC |
333 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
334 | record->size); | |
a694d1b5 | 335 | return 0; |
b10b4711 | 336 | } else if (record->type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
337 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
338 | return -EINVAL; | |
b5d38e9b AV |
339 | } |
340 | ||
b10b4711 | 341 | if (record->type != PSTORE_TYPE_DMESG) |
9ba80d99 | 342 | return -EINVAL; |
56d611a0 | 343 | |
b10b4711 | 344 | /* |
791205e3 KC |
345 | * We could filter on record->reason here if we wanted to (which |
346 | * would duplicate what happened before the "max_reason" setting | |
347 | * was added), but that would defeat the purpose of a system | |
348 | * changing printk.always_kmsg_dump, so instead log everything that | |
349 | * the kmsg dumper sends us, since it should be doing the filtering | |
350 | * based on the combination of printk.always_kmsg_dump and our | |
351 | * requested "max_reason". | |
9ba80d99 | 352 | */ |
9ba80d99 | 353 | |
b10b4711 KC |
354 | /* |
355 | * Explicitly only take the first part of any new crash. | |
9ba80d99 KC |
356 | * If our buffer is larger than kmsg_bytes, this can never happen, |
357 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
358 | * report split across multiple records. | |
359 | */ | |
b10b4711 | 360 | if (record->part != 1) |
9ba80d99 | 361 | return -ENOSPC; |
56d611a0 | 362 | |
a5d23b95 | 363 | if (!cxt->dprzs) |
c6289378 AH |
364 | return -ENOSPC; |
365 | ||
a5d23b95 | 366 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 367 | |
9e5f1c19 AY |
368 | /* |
369 | * Since this is a new crash dump, we need to reset the buffer in | |
370 | * case it still has an old dump present. Without this, the new dump | |
371 | * will get appended, which would seriously confuse anything trying | |
372 | * to check dump file contents. Specifically, ramoops_read_kmsg_hdr() | |
373 | * expects to find a dump header in the beginning of buffer data, so | |
374 | * we must to reset the buffer values, in order to ensure that the | |
375 | * header will be written to the beginning of the buffer. | |
376 | */ | |
377 | persistent_ram_zap(prz); | |
378 | ||
b10b4711 | 379 | /* Build header and append record contents. */ |
c7f3c595 | 380 | hlen = ramoops_write_kmsg_hdr(prz, record); |
47afd7ae YH |
381 | if (!hlen) |
382 | return -ENOMEM; | |
383 | ||
b10b4711 | 384 | size = record->size; |
896fc1f0 AV |
385 | if (size + hlen > prz->buffer_size) |
386 | size = prz->buffer_size - hlen; | |
b10b4711 | 387 | persistent_ram_write(prz, record->buf, size); |
56d611a0 | 388 | |
cac2eb7b | 389 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
390 | |
391 | return 0; | |
392 | } | |
393 | ||
4c9ec219 KC |
394 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
395 | const char __user *buf) | |
5bf6d1b9 | 396 | { |
fdd03118 KC |
397 | if (record->type == PSTORE_TYPE_PMSG) { |
398 | struct ramoops_context *cxt = record->psi->data; | |
5bf6d1b9 MS |
399 | |
400 | if (!cxt->mprz) | |
401 | return -ENOMEM; | |
fdd03118 | 402 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
5bf6d1b9 MS |
403 | } |
404 | ||
405 | return -EINVAL; | |
406 | } | |
407 | ||
a61072aa | 408 | static int ramoops_pstore_erase(struct pstore_record *record) |
9ba80d99 | 409 | { |
a61072aa | 410 | struct ramoops_context *cxt = record->psi->data; |
b5d38e9b | 411 | struct persistent_ram_zone *prz; |
9ba80d99 | 412 | |
a61072aa | 413 | switch (record->type) { |
b5d38e9b | 414 | case PSTORE_TYPE_DMESG: |
a61072aa | 415 | if (record->id >= cxt->max_dump_cnt) |
b5d38e9b | 416 | return -EINVAL; |
a61072aa | 417 | prz = cxt->dprzs[record->id]; |
b5d38e9b AV |
418 | break; |
419 | case PSTORE_TYPE_CONSOLE: | |
420 | prz = cxt->cprz; | |
421 | break; | |
a694d1b5 | 422 | case PSTORE_TYPE_FTRACE: |
a61072aa | 423 | if (record->id >= cxt->max_ftrace_cnt) |
a1cf53ac | 424 | return -EINVAL; |
a61072aa | 425 | prz = cxt->fprzs[record->id]; |
a694d1b5 | 426 | break; |
9d5438f4 MS |
427 | case PSTORE_TYPE_PMSG: |
428 | prz = cxt->mprz; | |
429 | break; | |
b5d38e9b | 430 | default: |
9ba80d99 | 431 | return -EINVAL; |
b5d38e9b | 432 | } |
9ba80d99 | 433 | |
b5d38e9b AV |
434 | persistent_ram_free_old(prz); |
435 | persistent_ram_zap(prz); | |
9ba80d99 KC |
436 | |
437 | return 0; | |
56d611a0 MS |
438 | } |
439 | ||
9ba80d99 KC |
440 | static struct ramoops_context oops_cxt = { |
441 | .pstore = { | |
442 | .owner = THIS_MODULE, | |
443 | .name = "ramoops", | |
444 | .open = ramoops_pstore_open, | |
445 | .read = ramoops_pstore_read, | |
4c9ec219 KC |
446 | .write = ramoops_pstore_write, |
447 | .write_user = ramoops_pstore_write_user, | |
9ba80d99 KC |
448 | .erase = ramoops_pstore_erase, |
449 | }, | |
450 | }; | |
451 | ||
f4c5d242 AV |
452 | static void ramoops_free_przs(struct ramoops_context *cxt) |
453 | { | |
454 | int i; | |
455 | ||
3219122b | 456 | /* Free pmsg PRZ */ |
06b4e09a | 457 | persistent_ram_free(&cxt->mprz); |
3219122b KC |
458 | |
459 | /* Free console PRZ */ | |
06b4e09a | 460 | persistent_ram_free(&cxt->cprz); |
3219122b | 461 | |
a1cf53ac | 462 | /* Free dump PRZs */ |
a5d23b95 | 463 | if (cxt->dprzs) { |
a1cf53ac | 464 | for (i = 0; i < cxt->max_dump_cnt; i++) |
06b4e09a | 465 | persistent_ram_free(&cxt->dprzs[i]); |
f4c5d242 | 466 | |
a5d23b95 | 467 | kfree(cxt->dprzs); |
06b4e09a | 468 | cxt->dprzs = NULL; |
a1cf53ac JF |
469 | cxt->max_dump_cnt = 0; |
470 | } | |
4407de74 | 471 | |
a1cf53ac JF |
472 | /* Free ftrace PRZs */ |
473 | if (cxt->fprzs) { | |
474 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
06b4e09a | 475 | persistent_ram_free(&cxt->fprzs[i]); |
a1cf53ac | 476 | kfree(cxt->fprzs); |
06b4e09a | 477 | cxt->fprzs = NULL; |
a1cf53ac JF |
478 | cxt->max_ftrace_cnt = 0; |
479 | } | |
f4c5d242 AV |
480 | } |
481 | ||
c443a5f3 KC |
482 | static int ramoops_init_przs(const char *name, |
483 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
484 | struct persistent_ram_zone ***przs, |
485 | phys_addr_t *paddr, size_t mem_sz, | |
486 | ssize_t record_size, | |
487 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
488 | { |
489 | int err = -ENOMEM; | |
490 | int i; | |
de832092 KC |
491 | size_t zone_sz; |
492 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 493 | |
de832092 KC |
494 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
495 | if (mem_sz == 0 || record_size == 0) { | |
496 | *cnt = 0; | |
f4c5d242 | 497 | return 0; |
c6289378 AH |
498 | } |
499 | ||
de832092 KC |
500 | /* |
501 | * If we have a negative record size, calculate it based on | |
502 | * mem_sz / *cnt. If we have a positive record size, calculate | |
503 | * cnt from mem_sz / record_size. | |
504 | */ | |
505 | if (record_size < 0) { | |
506 | if (*cnt == 0) | |
507 | return 0; | |
508 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
509 | if (record_size == 0) { |
510 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
511 | name, mem_sz, *cnt); | |
de832092 | 512 | goto fail; |
c443a5f3 | 513 | } |
de832092 KC |
514 | } else { |
515 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
516 | if (*cnt == 0) { |
517 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
518 | name, mem_sz, record_size); | |
de832092 | 519 | goto fail; |
c443a5f3 | 520 | } |
de832092 | 521 | } |
f4c5d242 | 522 | |
de832092 | 523 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
524 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
525 | name, | |
de832092 KC |
526 | mem_sz, (unsigned long long)*paddr, |
527 | cxt->size, (unsigned long long)cxt->phys_addr); | |
528 | goto fail; | |
f4c5d242 AV |
529 | } |
530 | ||
de832092 | 531 | zone_sz = mem_sz / *cnt; |
d49270a0 | 532 | zone_sz = ALIGN_DOWN(zone_sz, 2); |
c443a5f3 KC |
533 | if (!zone_sz) { |
534 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 535 | goto fail; |
c443a5f3 | 536 | } |
de832092 KC |
537 | |
538 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
539 | if (!prz_ar) | |
540 | goto fail; | |
541 | ||
542 | for (i = 0; i < *cnt; i++) { | |
1227daa4 KC |
543 | char *label; |
544 | ||
545 | if (*cnt == 1) | |
546 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); | |
547 | else | |
548 | label = kasprintf(GFP_KERNEL, "ramoops:%s(%d/%d)", | |
549 | name, i, *cnt - 1); | |
de832092 | 550 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, |
1227daa4 KC |
551 | &cxt->ecc_info, |
552 | cxt->memtype, flags, label); | |
e163fdb3 | 553 | kfree(label); |
de832092 KC |
554 | if (IS_ERR(prz_ar[i])) { |
555 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
556 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
557 | name, record_size, | |
558 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
559 | |
560 | while (i > 0) { | |
561 | i--; | |
06b4e09a | 562 | persistent_ram_free(&prz_ar[i]); |
4407de74 | 563 | } |
de832092 | 564 | kfree(prz_ar); |
06b4e09a | 565 | prz_ar = NULL; |
de832092 | 566 | goto fail; |
f4c5d242 | 567 | } |
de832092 | 568 | *paddr += zone_sz; |
f0f23e54 | 569 | prz_ar[i]->type = pstore_name_to_type(name); |
f4c5d242 AV |
570 | } |
571 | ||
de832092 | 572 | *przs = prz_ar; |
f4c5d242 | 573 | return 0; |
de832092 KC |
574 | |
575 | fail: | |
576 | *cnt = 0; | |
f4c5d242 AV |
577 | return err; |
578 | } | |
579 | ||
c443a5f3 KC |
580 | static int ramoops_init_prz(const char *name, |
581 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
582 | struct persistent_ram_zone **prz, |
583 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b | 584 | { |
1227daa4 KC |
585 | char *label; |
586 | ||
b5d38e9b AV |
587 | if (!sz) |
588 | return 0; | |
589 | ||
c6289378 | 590 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
591 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
592 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 593 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 594 | return -ENOMEM; |
c6289378 | 595 | } |
b5d38e9b | 596 | |
1227daa4 | 597 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); |
663deb47 | 598 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
7684bd33 | 599 | cxt->memtype, PRZ_FLAG_ZAP_OLD, label); |
e163fdb3 | 600 | kfree(label); |
b5d38e9b AV |
601 | if (IS_ERR(*prz)) { |
602 | int err = PTR_ERR(*prz); | |
603 | ||
c443a5f3 KC |
604 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
605 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
606 | return err; |
607 | } | |
608 | ||
b5d38e9b | 609 | *paddr += sz; |
f0f23e54 | 610 | (*prz)->type = pstore_name_to_type(name); |
b5d38e9b AV |
611 | |
612 | return 0; | |
613 | } | |
614 | ||
26961d76 KC |
615 | /* Read a u32 from a dt property and make sure it's safe for an int. */ |
616 | static int ramoops_parse_dt_u32(struct platform_device *pdev, | |
617 | const char *propname, | |
618 | u32 default_value, u32 *value) | |
35da6094 GH |
619 | { |
620 | u32 val32 = 0; | |
621 | int ret; | |
622 | ||
623 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
26961d76 KC |
624 | if (ret == -EINVAL) { |
625 | /* field is missing, use default value. */ | |
626 | val32 = default_value; | |
627 | } else if (ret < 0) { | |
35da6094 GH |
628 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", |
629 | propname, ret); | |
630 | return ret; | |
631 | } | |
632 | ||
26961d76 | 633 | /* Sanity check our results. */ |
35da6094 GH |
634 | if (val32 > INT_MAX) { |
635 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
636 | return -EOVERFLOW; | |
637 | } | |
638 | ||
639 | *value = val32; | |
640 | return 0; | |
641 | } | |
642 | ||
643 | static int ramoops_parse_dt(struct platform_device *pdev, | |
644 | struct ramoops_platform_data *pdata) | |
645 | { | |
646 | struct device_node *of_node = pdev->dev.of_node; | |
1614e921 | 647 | struct device_node *parent_node; |
529182e2 | 648 | struct resource *res; |
35da6094 GH |
649 | u32 value; |
650 | int ret; | |
651 | ||
652 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
653 | ||
529182e2 KC |
654 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
655 | if (!res) { | |
35da6094 | 656 | dev_err(&pdev->dev, |
529182e2 KC |
657 | "failed to locate DT /reserved-memory resource\n"); |
658 | return -EINVAL; | |
35da6094 GH |
659 | } |
660 | ||
529182e2 KC |
661 | pdata->mem_size = resource_size(res); |
662 | pdata->mem_address = res->start; | |
9d843e8f MO |
663 | /* |
664 | * Setting "unbuffered" is deprecated and will be ignored if | |
665 | * "mem_type" is also specified. | |
666 | */ | |
35da6094 | 667 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
791205e3 KC |
668 | /* |
669 | * Setting "no-dump-oops" is deprecated and will be ignored if | |
670 | * "max_reason" is also specified. | |
671 | */ | |
672 | if (of_property_read_bool(of_node, "no-dump-oops")) | |
673 | pdata->max_reason = KMSG_DUMP_PANIC; | |
674 | else | |
675 | pdata->max_reason = KMSG_DUMP_OOPS; | |
35da6094 | 676 | |
26961d76 KC |
677 | #define parse_u32(name, field, default_value) { \ |
678 | ret = ramoops_parse_dt_u32(pdev, name, default_value, \ | |
679 | &value); \ | |
35da6094 GH |
680 | if (ret < 0) \ |
681 | return ret; \ | |
682 | field = value; \ | |
683 | } | |
684 | ||
beca3e31 | 685 | parse_u32("mem-type", pdata->mem_type, pdata->mem_type); |
26961d76 KC |
686 | parse_u32("record-size", pdata->record_size, 0); |
687 | parse_u32("console-size", pdata->console_size, 0); | |
688 | parse_u32("ftrace-size", pdata->ftrace_size, 0); | |
689 | parse_u32("pmsg-size", pdata->pmsg_size, 0); | |
690 | parse_u32("ecc-size", pdata->ecc_info.ecc_size, 0); | |
691 | parse_u32("flags", pdata->flags, 0); | |
791205e3 | 692 | parse_u32("max-reason", pdata->max_reason, pdata->max_reason); |
35da6094 | 693 | |
26961d76 | 694 | #undef parse_u32 |
35da6094 | 695 | |
1614e921 DA |
696 | /* |
697 | * Some old Chromebooks relied on the kernel setting the | |
698 | * console_size and pmsg_size to the record size since that's | |
699 | * what the downstream kernel did. These same Chromebooks had | |
700 | * "ramoops" straight under the root node which isn't | |
701 | * according to the current upstream bindings (though it was | |
702 | * arguably acceptable under a prior version of the bindings). | |
703 | * Let's make those old Chromebooks work by detecting that | |
704 | * we're not a child of "reserved-memory" and mimicking the | |
705 | * expected behavior. | |
706 | */ | |
707 | parent_node = of_get_parent(of_node); | |
708 | if (!of_node_name_eq(parent_node, "reserved-memory") && | |
709 | !pdata->console_size && !pdata->ftrace_size && | |
710 | !pdata->pmsg_size && !pdata->ecc_info.ecc_size) { | |
711 | pdata->console_size = pdata->record_size; | |
712 | pdata->pmsg_size = pdata->record_size; | |
713 | } | |
714 | of_node_put(parent_node); | |
715 | ||
35da6094 GH |
716 | return 0; |
717 | } | |
718 | ||
f568f6ca | 719 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 720 | { |
896fc1f0 | 721 | struct device *dev = &pdev->dev; |
35da6094 | 722 | struct ramoops_platform_data *pdata = dev->platform_data; |
5631e857 | 723 | struct ramoops_platform_data pdata_local; |
56d611a0 | 724 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
725 | size_t dump_mem_sz; |
726 | phys_addr_t paddr; | |
56d611a0 MS |
727 | int err = -EINVAL; |
728 | ||
fc46d4e4 KC |
729 | /* |
730 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
731 | * probes. |
732 | */ | |
fc46d4e4 KC |
733 | if (cxt->max_dump_cnt) { |
734 | pr_err("already initialized\n"); | |
9ba80d99 | 735 | goto fail_out; |
fc46d4e4 KC |
736 | } |
737 | ||
1e0f67a9 YH |
738 | if (dev_of_node(dev) && !pdata) { |
739 | pdata = &pdata_local; | |
740 | memset(pdata, 0, sizeof(*pdata)); | |
741 | ||
742 | err = ramoops_parse_dt(pdev, pdata); | |
743 | if (err < 0) | |
744 | goto fail_out; | |
745 | } | |
746 | ||
fc46d4e4 KC |
747 | /* Make sure we didn't get bogus platform data pointer. */ |
748 | if (!pdata) { | |
749 | pr_err("NULL platform data\n"); | |
e1fce564 | 750 | err = -EINVAL; |
fc46d4e4 KC |
751 | goto fail_out; |
752 | } | |
9ba80d99 | 753 | |
a694d1b5 | 754 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 755 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 756 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 757 | "non-zero\n"); |
e1fce564 | 758 | err = -EINVAL; |
9ba80d99 | 759 | goto fail_out; |
56d611a0 MS |
760 | } |
761 | ||
3bd11cf5 | 762 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 763 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 764 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 765 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 766 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 767 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
768 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
769 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 770 | |
13aefd72 MS |
771 | cxt->size = pdata->mem_size; |
772 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 773 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 774 | cxt->record_size = pdata->record_size; |
b5d38e9b | 775 | cxt->console_size = pdata->console_size; |
a694d1b5 | 776 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 777 | cxt->pmsg_size = pdata->pmsg_size; |
a1cf53ac | 778 | cxt->flags = pdata->flags; |
c31ad081 | 779 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 780 | |
f4c5d242 | 781 | paddr = cxt->phys_addr; |
896fc1f0 | 782 | |
9d5438f4 MS |
783 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
784 | - cxt->pmsg_size; | |
f0f23e54 | 785 | err = ramoops_init_przs("dmesg", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
786 | dump_mem_sz, cxt->record_size, |
787 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b | 788 | if (err) |
3219122b | 789 | goto fail_init; |
b5d38e9b | 790 | |
c443a5f3 | 791 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 792 | cxt->console_size, 0); |
b5d38e9b | 793 | if (err) |
3219122b | 794 | goto fail_init; |
b5d38e9b | 795 | |
6daf4e82 KC |
796 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
797 | cxt->pmsg_size, 0); | |
798 | if (err) | |
799 | goto fail_init; | |
800 | ||
a1cf53ac JF |
801 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
802 | ? nr_cpu_ids | |
803 | : 1; | |
c443a5f3 KC |
804 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
805 | cxt->ftrace_size, -1, | |
806 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
807 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
808 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 | 809 | if (err) |
3219122b | 810 | goto fail_init; |
a694d1b5 | 811 | |
9ba80d99 | 812 | cxt->pstore.data = cxt; |
b5d38e9b | 813 | /* |
8880fa32 KC |
814 | * Prepare frontend flags based on which areas are initialized. |
815 | * For ramoops_init_przs() cases, the "max count" variable tells | |
816 | * if there are regions present. For ramoops_init_prz() cases, | |
817 | * the single region size is how to check. | |
b5d38e9b | 818 | */ |
8880fa32 | 819 | cxt->pstore.flags = 0; |
791205e3 | 820 | if (cxt->max_dump_cnt) { |
8880fa32 | 821 | cxt->pstore.flags |= PSTORE_FLAGS_DMESG; |
791205e3 KC |
822 | cxt->pstore.max_reason = pdata->max_reason; |
823 | } | |
79d955af NK |
824 | if (cxt->console_size) |
825 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
8880fa32 | 826 | if (cxt->max_ftrace_cnt) |
79d955af NK |
827 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; |
828 | if (cxt->pmsg_size) | |
829 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 830 | |
8880fa32 KC |
831 | /* |
832 | * Since bufsize is only used for dmesg crash dumps, it | |
833 | * must match the size of the dprz record (after PRZ header | |
834 | * and ECC bytes have been accounted for). | |
835 | */ | |
836 | if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) { | |
837 | cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size; | |
104fd0b5 | 838 | cxt->pstore.buf = kvzalloc(cxt->pstore.bufsize, GFP_KERNEL); |
8880fa32 KC |
839 | if (!cxt->pstore.buf) { |
840 | pr_err("cannot allocate pstore crash dump buffer\n"); | |
841 | err = -ENOMEM; | |
842 | goto fail_clear; | |
843 | } | |
844 | } | |
845 | ||
9ba80d99 | 846 | err = pstore_register(&cxt->pstore); |
56d611a0 | 847 | if (err) { |
9ba80d99 | 848 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 849 | goto fail_buf; |
56d611a0 MS |
850 | } |
851 | ||
c755201e KC |
852 | /* |
853 | * Update the module parameter variables as well so they are visible | |
854 | * through /sys/module/ramoops/parameters/ | |
855 | */ | |
856 | mem_size = pdata->mem_size; | |
857 | mem_address = pdata->mem_address; | |
858 | record_size = pdata->record_size; | |
791205e3 | 859 | ramoops_max_reason = pdata->max_reason; |
62f269ef WL |
860 | ramoops_console_size = pdata->console_size; |
861 | ramoops_pmsg_size = pdata->pmsg_size; | |
862 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 863 | |
dc80b1ea | 864 | pr_info("using 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 865 | cxt->size, (unsigned long long)cxt->phys_addr, |
dc80b1ea | 866 | cxt->ecc_info.ecc_size); |
9ba80d99 | 867 | |
56d611a0 MS |
868 | return 0; |
869 | ||
9ba80d99 | 870 | fail_buf: |
104fd0b5 | 871 | kvfree(cxt->pstore.buf); |
9ba80d99 KC |
872 | fail_clear: |
873 | cxt->pstore.bufsize = 0; | |
3219122b | 874 | fail_init: |
f4c5d242 | 875 | ramoops_free_przs(cxt); |
9ba80d99 | 876 | fail_out: |
56d611a0 MS |
877 | return err; |
878 | } | |
879 | ||
48f2c681 | 880 | static void ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
881 | { |
882 | struct ramoops_context *cxt = &oops_cxt; | |
883 | ||
ee1d2674 | 884 | pstore_unregister(&cxt->pstore); |
9ba80d99 | 885 | |
104fd0b5 | 886 | kvfree(cxt->pstore.buf); |
9ba80d99 KC |
887 | cxt->pstore.bufsize = 0; |
888 | ||
ee1d2674 | 889 | ramoops_free_przs(cxt); |
56d611a0 MS |
890 | } |
891 | ||
35da6094 GH |
892 | static const struct of_device_id dt_match[] = { |
893 | { .compatible = "ramoops" }, | |
894 | {} | |
895 | }; | |
12dc54f5 | 896 | MODULE_DEVICE_TABLE(of, dt_match); |
35da6094 | 897 | |
c3b92ce9 | 898 | static struct platform_driver ramoops_driver = { |
924d3711 | 899 | .probe = ramoops_probe, |
48f2c681 | 900 | .remove_new = ramoops_remove, |
c3b92ce9 | 901 | .driver = { |
35da6094 GH |
902 | .name = "ramoops", |
903 | .of_match_table = dt_match, | |
c3b92ce9 KP |
904 | }, |
905 | }; | |
906 | ||
bac6f6cd | 907 | static inline void ramoops_unregister_dummy(void) |
c3b92ce9 | 908 | { |
bac6f6cd KC |
909 | platform_device_unregister(dummy); |
910 | dummy = NULL; | |
bac6f6cd KC |
911 | } |
912 | ||
913 | static void __init ramoops_register_dummy(void) | |
914 | { | |
182ca6e0 YH |
915 | struct ramoops_platform_data pdata; |
916 | ||
bac6f6cd KC |
917 | /* |
918 | * Prepare a dummy platform data structure to carry the module | |
919 | * parameters. If mem_size isn't set, then there are no module | |
920 | * parameters, and we can skip this. | |
921 | */ | |
924d3711 AV |
922 | if (!mem_size) |
923 | return; | |
924 | ||
925 | pr_info("using module parameters\n"); | |
926 | ||
182ca6e0 YH |
927 | memset(&pdata, 0, sizeof(pdata)); |
928 | pdata.mem_size = mem_size; | |
929 | pdata.mem_address = mem_address; | |
930 | pdata.mem_type = mem_type; | |
931 | pdata.record_size = record_size; | |
932 | pdata.console_size = ramoops_console_size; | |
933 | pdata.ftrace_size = ramoops_ftrace_size; | |
934 | pdata.pmsg_size = ramoops_pmsg_size; | |
791205e3 KC |
935 | /* If "max_reason" is set, its value has priority over "dump_oops". */ |
936 | if (ramoops_max_reason >= 0) | |
937 | pdata.max_reason = ramoops_max_reason; | |
938 | /* Otherwise, if "dump_oops" is set, parse it into "max_reason". */ | |
939 | else if (ramoops_dump_oops != -1) | |
940 | pdata.max_reason = ramoops_dump_oops ? KMSG_DUMP_OOPS | |
941 | : KMSG_DUMP_PANIC; | |
942 | /* And if neither are explicitly set, use the default. */ | |
943 | else | |
944 | pdata.max_reason = KMSG_DUMP_OOPS; | |
182ca6e0 | 945 | pdata.flags = RAMOOPS_FLAG_FTRACE_PER_CPU; |
a1cf53ac | 946 | |
5ca5d4e6 AV |
947 | /* |
948 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
949 | * (using 1 byte for ECC isn't much of use anyway). | |
950 | */ | |
182ca6e0 | 951 | pdata.ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
952 | |
953 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
182ca6e0 | 954 | &pdata, sizeof(pdata)); |
924d3711 AV |
955 | if (IS_ERR(dummy)) { |
956 | pr_info("could not create platform device: %ld\n", | |
957 | PTR_ERR(dummy)); | |
bac6f6cd | 958 | dummy = NULL; |
924d3711 AV |
959 | } |
960 | } | |
961 | ||
962 | static int __init ramoops_init(void) | |
963 | { | |
bac6f6cd KC |
964 | int ret; |
965 | ||
924d3711 | 966 | ramoops_register_dummy(); |
bac6f6cd KC |
967 | ret = platform_driver_register(&ramoops_driver); |
968 | if (ret != 0) | |
969 | ramoops_unregister_dummy(); | |
970 | ||
971 | return ret; | |
c3b92ce9 | 972 | } |
41603165 | 973 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
974 | |
975 | static void __exit ramoops_exit(void) | |
976 | { | |
977 | platform_driver_unregister(&ramoops_driver); | |
bac6f6cd | 978 | ramoops_unregister_dummy(); |
c3b92ce9 | 979 | } |
56d611a0 MS |
980 | module_exit(ramoops_exit); |
981 | ||
982 | MODULE_LICENSE("GPL"); | |
983 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
984 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |