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> |
1894a253 | 21 | #include <linux/pstore_ram.h> |
35da6094 GH |
22 | #include <linux/of.h> |
23 | #include <linux/of_address.h> | |
56d611a0 MS |
24 | |
25 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 26 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 27 | |
3e5c4fad SI |
28 | static ulong record_size = MIN_MEM_SIZE; |
29 | module_param(record_size, ulong, 0400); | |
30 | MODULE_PARM_DESC(record_size, | |
31 | "size of each dump done on oops/panic"); | |
56d611a0 | 32 | |
b5d38e9b AV |
33 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
34 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
35 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
36 | ||
a694d1b5 AV |
37 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
38 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
39 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
40 | ||
9d5438f4 MS |
41 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
42 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
43 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
44 | ||
764fd639 | 45 | static unsigned long long mem_address; |
b90fe0c4 | 46 | module_param_hw(mem_address, ullong, other, 0400); |
56d611a0 MS |
47 | MODULE_PARM_DESC(mem_address, |
48 | "start of reserved RAM used to store oops/panic logs"); | |
49 | ||
50 | static ulong mem_size; | |
51 | module_param(mem_size, ulong, 0400); | |
52 | MODULE_PARM_DESC(mem_size, | |
53 | "size of reserved RAM used to store oops/panic logs"); | |
54 | ||
027bc8b0 TL |
55 | static unsigned int mem_type; |
56 | module_param(mem_type, uint, 0600); | |
57 | MODULE_PARM_DESC(mem_type, | |
58 | "set to 1 to try to use unbuffered memory (default 0)"); | |
59 | ||
56d611a0 MS |
60 | static int dump_oops = 1; |
61 | module_param(dump_oops, int, 0600); | |
62 | MODULE_PARM_DESC(dump_oops, | |
63 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
64 | ||
39eb7e97 AV |
65 | static int ramoops_ecc; |
66 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
67 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
68 | "if non-zero, the option enables ECC support and specifies " |
69 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
70 | "bytes ECC)"); | |
39eb7e97 | 71 | |
9ba80d99 | 72 | struct ramoops_context { |
a5d23b95 KC |
73 | struct persistent_ram_zone **dprzs; /* Oops dump zones */ |
74 | struct persistent_ram_zone *cprz; /* Console zone */ | |
75 | struct persistent_ram_zone **fprzs; /* Ftrace zones */ | |
76 | struct persistent_ram_zone *mprz; /* PMSG zone */ | |
56d611a0 MS |
77 | phys_addr_t phys_addr; |
78 | unsigned long size; | |
027bc8b0 | 79 | unsigned int memtype; |
9ba80d99 | 80 | size_t record_size; |
b5d38e9b | 81 | size_t console_size; |
a694d1b5 | 82 | size_t ftrace_size; |
9d5438f4 | 83 | size_t pmsg_size; |
6b4d2a27 | 84 | int dump_oops; |
a1cf53ac | 85 | u32 flags; |
c31ad081 | 86 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
87 | unsigned int max_dump_cnt; |
88 | unsigned int dump_write_cnt; | |
57fd8353 | 89 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 90 | unsigned int dump_read_cnt; |
b5d38e9b | 91 | unsigned int console_read_cnt; |
a1cf53ac | 92 | unsigned int max_ftrace_cnt; |
a694d1b5 | 93 | unsigned int ftrace_read_cnt; |
9d5438f4 | 94 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
95 | struct pstore_info pstore; |
96 | }; | |
56d611a0 | 97 | |
13aefd72 | 98 | static struct platform_device *dummy; |
13aefd72 | 99 | |
9ba80d99 KC |
100 | static int ramoops_pstore_open(struct pstore_info *psi) |
101 | { | |
102 | struct ramoops_context *cxt = psi->data; | |
103 | ||
cac2eb7b | 104 | cxt->dump_read_cnt = 0; |
b5d38e9b | 105 | cxt->console_read_cnt = 0; |
57fd8353 | 106 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 107 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
108 | return 0; |
109 | } | |
110 | ||
755d66b4 | 111 | static struct persistent_ram_zone * |
b05c9506 JFG |
112 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id, |
113 | struct pstore_record *record) | |
755d66b4 AV |
114 | { |
115 | struct persistent_ram_zone *prz; | |
755d66b4 | 116 | |
46418413 | 117 | /* Give up if we never existed or have hit the end. */ |
b05c9506 | 118 | if (!przs) |
755d66b4 AV |
119 | return NULL; |
120 | ||
b05c9506 | 121 | prz = przs[id]; |
b0aa931f LS |
122 | if (!prz) |
123 | return NULL; | |
755d66b4 | 124 | |
aa9a4a1e | 125 | /* Update old/shadowed buffer. */ |
6a4c9ab1 | 126 | if (prz->type == PSTORE_TYPE_DMESG) |
755d66b4 | 127 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
128 | |
129 | if (!persistent_ram_old_size(prz)) | |
130 | return NULL; | |
755d66b4 | 131 | |
b05c9506 JFG |
132 | record->type = prz->type; |
133 | record->id = id; | |
755d66b4 AV |
134 | |
135 | return prz; | |
136 | } | |
137 | ||
7aaa822e | 138 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time, |
3f8f80f0 AB |
139 | bool *compressed) |
140 | { | |
141 | char data_type; | |
a28726b4 | 142 | int header_length = 0; |
3f8f80f0 | 143 | |
e264abea AB |
144 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n", |
145 | (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type, | |
7aaa822e | 146 | &header_length) == 3) { |
83b8a3fb | 147 | time->tv_nsec *= 1000; |
3f8f80f0 AB |
148 | if (data_type == 'C') |
149 | *compressed = true; | |
150 | else | |
151 | *compressed = false; | |
e264abea AB |
152 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n", |
153 | (time64_t *)&time->tv_sec, &time->tv_nsec, | |
7aaa822e | 154 | &header_length) == 2) { |
83b8a3fb | 155 | time->tv_nsec *= 1000; |
7aaa822e | 156 | *compressed = false; |
3f8f80f0 AB |
157 | } else { |
158 | time->tv_sec = 0; | |
159 | time->tv_nsec = 0; | |
160 | *compressed = false; | |
161 | } | |
a28726b4 | 162 | return header_length; |
3f8f80f0 AB |
163 | } |
164 | ||
f44f9652 MS |
165 | static bool prz_ok(struct persistent_ram_zone *prz) |
166 | { | |
167 | return !!prz && !!(persistent_ram_old_size(prz) + | |
168 | persistent_ram_ecc_string(prz, NULL, 0)); | |
169 | } | |
170 | ||
2fbea82b JF |
171 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, |
172 | struct persistent_ram_zone *src) | |
173 | { | |
174 | size_t dest_size, src_size, total, dest_off, src_off; | |
175 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; | |
176 | void *merged_buf; | |
177 | struct pstore_ftrace_record *drec, *srec, *mrec; | |
178 | size_t record_size = sizeof(struct pstore_ftrace_record); | |
179 | ||
180 | dest_off = dest->old_log_size % record_size; | |
181 | dest_size = dest->old_log_size - dest_off; | |
182 | ||
183 | src_off = src->old_log_size % record_size; | |
184 | src_size = src->old_log_size - src_off; | |
185 | ||
186 | total = dest_size + src_size; | |
187 | merged_buf = kmalloc(total, GFP_KERNEL); | |
188 | if (!merged_buf) | |
189 | return -ENOMEM; | |
190 | ||
191 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); | |
192 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); | |
193 | mrec = (struct pstore_ftrace_record *)(merged_buf); | |
194 | ||
195 | while (dest_size > 0 && src_size > 0) { | |
196 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < | |
197 | pstore_ftrace_read_timestamp(&srec[src_idx])) { | |
198 | mrec[merged_idx++] = drec[dest_idx++]; | |
199 | dest_size -= record_size; | |
200 | } else { | |
201 | mrec[merged_idx++] = srec[src_idx++]; | |
202 | src_size -= record_size; | |
203 | } | |
204 | } | |
205 | ||
206 | while (dest_size > 0) { | |
207 | mrec[merged_idx++] = drec[dest_idx++]; | |
208 | dest_size -= record_size; | |
209 | } | |
210 | ||
211 | while (src_size > 0) { | |
212 | mrec[merged_idx++] = srec[src_idx++]; | |
213 | src_size -= record_size; | |
214 | } | |
215 | ||
216 | kfree(dest->old_log); | |
217 | dest->old_log = merged_buf; | |
218 | dest->old_log_size = total; | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
125cc42b | 223 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
56d611a0 | 224 | { |
2fbea82b | 225 | ssize_t size = 0; |
125cc42b | 226 | struct ramoops_context *cxt = record->psi->data; |
e036bd33 BZ |
227 | struct persistent_ram_zone *prz = NULL; |
228 | int header_length = 0; | |
2fbea82b | 229 | bool free_prz = false; |
e036bd33 | 230 | |
125cc42b KC |
231 | /* |
232 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
e036bd33 BZ |
233 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
234 | * valid time stamps, so it is initialized to zero. | |
235 | */ | |
125cc42b KC |
236 | record->time.tv_sec = 0; |
237 | record->time.tv_nsec = 0; | |
238 | record->compressed = false; | |
e036bd33 BZ |
239 | |
240 | /* Find the next valid persistent_ram_zone for DMESG */ | |
241 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
b05c9506 JFG |
242 | prz = ramoops_get_next_prz(cxt->dprzs, cxt->dump_read_cnt++, |
243 | record); | |
e036bd33 BZ |
244 | if (!prz_ok(prz)) |
245 | continue; | |
246 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
125cc42b KC |
247 | &record->time, |
248 | &record->compressed); | |
e036bd33 BZ |
249 | /* Clear and skip this DMESG record if it has no valid header */ |
250 | if (!header_length) { | |
251 | persistent_ram_free_old(prz); | |
252 | persistent_ram_zap(prz); | |
253 | prz = NULL; | |
254 | } | |
255 | } | |
9ba80d99 | 256 | |
b05c9506 JFG |
257 | if (!prz_ok(prz) && !cxt->console_read_cnt++) |
258 | prz = ramoops_get_next_prz(&cxt->cprz, 0 /* single */, record); | |
2fbea82b | 259 | |
b05c9506 JFG |
260 | if (!prz_ok(prz) && !cxt->pmsg_read_cnt++) |
261 | prz = ramoops_get_next_prz(&cxt->mprz, 0 /* single */, record); | |
2fbea82b JF |
262 | |
263 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
46418413 | 264 | if (!prz_ok(prz)) { |
b05c9506 JFG |
265 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) && |
266 | !cxt->ftrace_read_cnt++) { | |
267 | prz = ramoops_get_next_prz(cxt->fprzs, 0 /* single */, | |
268 | record); | |
2fbea82b JF |
269 | } else { |
270 | /* | |
271 | * Build a new dummy record which combines all the | |
272 | * per-cpu records including metadata and ecc info. | |
273 | */ | |
274 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
275 | ||
276 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
277 | GFP_KERNEL); | |
278 | if (!tmp_prz) | |
279 | return -ENOMEM; | |
8665569e | 280 | prz = tmp_prz; |
2fbea82b JF |
281 | free_prz = true; |
282 | ||
283 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
284 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
b05c9506 | 285 | cxt->ftrace_read_cnt++, record); |
2fbea82b JF |
286 | |
287 | if (!prz_ok(prz_next)) | |
288 | continue; | |
289 | ||
290 | tmp_prz->ecc_info = prz_next->ecc_info; | |
291 | tmp_prz->corrected_bytes += | |
292 | prz_next->corrected_bytes; | |
293 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
294 | size = ftrace_log_combine(tmp_prz, prz_next); | |
295 | if (size) | |
296 | goto out; | |
297 | } | |
125cc42b | 298 | record->id = 0; |
a1cf53ac JF |
299 | } |
300 | } | |
301 | ||
2fbea82b JF |
302 | if (!prz_ok(prz)) { |
303 | size = 0; | |
304 | goto out; | |
305 | } | |
896fc1f0 | 306 | |
e036bd33 | 307 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
308 | |
309 | /* ECC correction notice */ | |
125cc42b | 310 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 311 | |
125cc42b KC |
312 | record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
313 | if (record->buf == NULL) { | |
2fbea82b JF |
314 | size = -ENOMEM; |
315 | goto out; | |
316 | } | |
9ba80d99 | 317 | |
125cc42b KC |
318 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
319 | size); | |
2fbea82b | 320 | |
125cc42b KC |
321 | persistent_ram_ecc_string(prz, record->buf + size, |
322 | record->ecc_notice_size + 1); | |
bd08ec33 | 323 | |
2fbea82b JF |
324 | out: |
325 | if (free_prz) { | |
326 | kfree(prz->old_log); | |
327 | kfree(prz); | |
328 | } | |
329 | ||
8cfc8ddc | 330 | return size; |
9ba80d99 KC |
331 | } |
332 | ||
3f8f80f0 | 333 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
c7f3c595 | 334 | struct pstore_record *record) |
896fc1f0 | 335 | { |
93ee4b7d | 336 | char hdr[36]; /* "===="(4), %lld(20), "."(1), %06lu(6), "-%c\n"(3) */ |
896fc1f0 AV |
337 | size_t len; |
338 | ||
93ee4b7d KC |
339 | len = scnprintf(hdr, sizeof(hdr), |
340 | RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n", | |
e264abea | 341 | (time64_t)record->time.tv_sec, |
c7f3c595 KC |
342 | record->time.tv_nsec / 1000, |
343 | record->compressed ? 'C' : 'D'); | |
896fc1f0 | 344 | persistent_ram_write(prz, hdr, len); |
896fc1f0 AV |
345 | |
346 | return len; | |
347 | } | |
348 | ||
4c9ec219 | 349 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
9ba80d99 | 350 | { |
b10b4711 | 351 | struct ramoops_context *cxt = record->psi->data; |
c6289378 | 352 | struct persistent_ram_zone *prz; |
b10b4711 | 353 | size_t size, hlen; |
9ba80d99 | 354 | |
b10b4711 | 355 | if (record->type == PSTORE_TYPE_CONSOLE) { |
b5d38e9b AV |
356 | if (!cxt->cprz) |
357 | return -ENOMEM; | |
b10b4711 | 358 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
b5d38e9b | 359 | return 0; |
b10b4711 | 360 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
361 | int zonenum; |
362 | ||
363 | if (!cxt->fprzs) | |
a694d1b5 | 364 | return -ENOMEM; |
a1cf53ac JF |
365 | /* |
366 | * Choose zone by if we're using per-cpu buffers. | |
367 | */ | |
368 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
369 | zonenum = smp_processor_id(); | |
370 | else | |
371 | zonenum = 0; | |
372 | ||
b10b4711 KC |
373 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
374 | record->size); | |
a694d1b5 | 375 | return 0; |
b10b4711 | 376 | } else if (record->type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
377 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
378 | return -EINVAL; | |
b5d38e9b AV |
379 | } |
380 | ||
b10b4711 | 381 | if (record->type != PSTORE_TYPE_DMESG) |
9ba80d99 | 382 | return -EINVAL; |
56d611a0 | 383 | |
b10b4711 KC |
384 | /* |
385 | * Out of the various dmesg dump types, ramoops is currently designed | |
9ba80d99 KC |
386 | * to only store crash logs, rather than storing general kernel logs. |
387 | */ | |
b10b4711 KC |
388 | if (record->reason != KMSG_DUMP_OOPS && |
389 | record->reason != KMSG_DUMP_PANIC) | |
9ba80d99 | 390 | return -EINVAL; |
fc2d557c | 391 | |
9ba80d99 | 392 | /* Skip Oopes when configured to do so. */ |
b10b4711 | 393 | if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
394 | return -EINVAL; |
395 | ||
b10b4711 KC |
396 | /* |
397 | * Explicitly only take the first part of any new crash. | |
9ba80d99 KC |
398 | * If our buffer is larger than kmsg_bytes, this can never happen, |
399 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
400 | * report split across multiple records. | |
401 | */ | |
b10b4711 | 402 | if (record->part != 1) |
9ba80d99 | 403 | return -ENOSPC; |
56d611a0 | 404 | |
a5d23b95 | 405 | if (!cxt->dprzs) |
c6289378 AH |
406 | return -ENOSPC; |
407 | ||
a5d23b95 | 408 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 409 | |
b10b4711 | 410 | /* Build header and append record contents. */ |
c7f3c595 | 411 | hlen = ramoops_write_kmsg_hdr(prz, record); |
47afd7ae YH |
412 | if (!hlen) |
413 | return -ENOMEM; | |
414 | ||
b10b4711 | 415 | size = record->size; |
896fc1f0 AV |
416 | if (size + hlen > prz->buffer_size) |
417 | size = prz->buffer_size - hlen; | |
b10b4711 | 418 | persistent_ram_write(prz, record->buf, size); |
56d611a0 | 419 | |
cac2eb7b | 420 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
421 | |
422 | return 0; | |
423 | } | |
424 | ||
4c9ec219 KC |
425 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
426 | const char __user *buf) | |
5bf6d1b9 | 427 | { |
fdd03118 KC |
428 | if (record->type == PSTORE_TYPE_PMSG) { |
429 | struct ramoops_context *cxt = record->psi->data; | |
5bf6d1b9 MS |
430 | |
431 | if (!cxt->mprz) | |
432 | return -ENOMEM; | |
fdd03118 | 433 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
5bf6d1b9 MS |
434 | } |
435 | ||
436 | return -EINVAL; | |
437 | } | |
438 | ||
a61072aa | 439 | static int ramoops_pstore_erase(struct pstore_record *record) |
9ba80d99 | 440 | { |
a61072aa | 441 | struct ramoops_context *cxt = record->psi->data; |
b5d38e9b | 442 | struct persistent_ram_zone *prz; |
9ba80d99 | 443 | |
a61072aa | 444 | switch (record->type) { |
b5d38e9b | 445 | case PSTORE_TYPE_DMESG: |
a61072aa | 446 | if (record->id >= cxt->max_dump_cnt) |
b5d38e9b | 447 | return -EINVAL; |
a61072aa | 448 | prz = cxt->dprzs[record->id]; |
b5d38e9b AV |
449 | break; |
450 | case PSTORE_TYPE_CONSOLE: | |
451 | prz = cxt->cprz; | |
452 | break; | |
a694d1b5 | 453 | case PSTORE_TYPE_FTRACE: |
a61072aa | 454 | if (record->id >= cxt->max_ftrace_cnt) |
a1cf53ac | 455 | return -EINVAL; |
a61072aa | 456 | prz = cxt->fprzs[record->id]; |
a694d1b5 | 457 | break; |
9d5438f4 MS |
458 | case PSTORE_TYPE_PMSG: |
459 | prz = cxt->mprz; | |
460 | break; | |
b5d38e9b | 461 | default: |
9ba80d99 | 462 | return -EINVAL; |
b5d38e9b | 463 | } |
9ba80d99 | 464 | |
b5d38e9b AV |
465 | persistent_ram_free_old(prz); |
466 | persistent_ram_zap(prz); | |
9ba80d99 KC |
467 | |
468 | return 0; | |
56d611a0 MS |
469 | } |
470 | ||
9ba80d99 KC |
471 | static struct ramoops_context oops_cxt = { |
472 | .pstore = { | |
473 | .owner = THIS_MODULE, | |
474 | .name = "ramoops", | |
475 | .open = ramoops_pstore_open, | |
476 | .read = ramoops_pstore_read, | |
4c9ec219 KC |
477 | .write = ramoops_pstore_write, |
478 | .write_user = ramoops_pstore_write_user, | |
9ba80d99 KC |
479 | .erase = ramoops_pstore_erase, |
480 | }, | |
481 | }; | |
482 | ||
f4c5d242 AV |
483 | static void ramoops_free_przs(struct ramoops_context *cxt) |
484 | { | |
485 | int i; | |
486 | ||
a1cf53ac | 487 | /* Free dump PRZs */ |
a5d23b95 | 488 | if (cxt->dprzs) { |
a1cf53ac | 489 | for (i = 0; i < cxt->max_dump_cnt; i++) |
a5d23b95 | 490 | persistent_ram_free(cxt->dprzs[i]); |
f4c5d242 | 491 | |
a5d23b95 | 492 | kfree(cxt->dprzs); |
a1cf53ac JF |
493 | cxt->max_dump_cnt = 0; |
494 | } | |
4407de74 | 495 | |
a1cf53ac JF |
496 | /* Free ftrace PRZs */ |
497 | if (cxt->fprzs) { | |
498 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
499 | persistent_ram_free(cxt->fprzs[i]); | |
500 | kfree(cxt->fprzs); | |
501 | cxt->max_ftrace_cnt = 0; | |
502 | } | |
f4c5d242 AV |
503 | } |
504 | ||
c443a5f3 KC |
505 | static int ramoops_init_przs(const char *name, |
506 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
507 | struct persistent_ram_zone ***przs, |
508 | phys_addr_t *paddr, size_t mem_sz, | |
509 | ssize_t record_size, | |
510 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
511 | { |
512 | int err = -ENOMEM; | |
513 | int i; | |
de832092 KC |
514 | size_t zone_sz; |
515 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 516 | |
de832092 KC |
517 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
518 | if (mem_sz == 0 || record_size == 0) { | |
519 | *cnt = 0; | |
f4c5d242 | 520 | return 0; |
c6289378 AH |
521 | } |
522 | ||
de832092 KC |
523 | /* |
524 | * If we have a negative record size, calculate it based on | |
525 | * mem_sz / *cnt. If we have a positive record size, calculate | |
526 | * cnt from mem_sz / record_size. | |
527 | */ | |
528 | if (record_size < 0) { | |
529 | if (*cnt == 0) | |
530 | return 0; | |
531 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
532 | if (record_size == 0) { |
533 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
534 | name, mem_sz, *cnt); | |
de832092 | 535 | goto fail; |
c443a5f3 | 536 | } |
de832092 KC |
537 | } else { |
538 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
539 | if (*cnt == 0) { |
540 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
541 | name, mem_sz, record_size); | |
de832092 | 542 | goto fail; |
c443a5f3 | 543 | } |
de832092 | 544 | } |
f4c5d242 | 545 | |
de832092 | 546 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
547 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
548 | name, | |
de832092 KC |
549 | mem_sz, (unsigned long long)*paddr, |
550 | cxt->size, (unsigned long long)cxt->phys_addr); | |
551 | goto fail; | |
f4c5d242 AV |
552 | } |
553 | ||
de832092 | 554 | zone_sz = mem_sz / *cnt; |
c443a5f3 KC |
555 | if (!zone_sz) { |
556 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 557 | goto fail; |
c443a5f3 | 558 | } |
de832092 KC |
559 | |
560 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
561 | if (!prz_ar) | |
562 | goto fail; | |
563 | ||
564 | for (i = 0; i < *cnt; i++) { | |
1227daa4 KC |
565 | char *label; |
566 | ||
567 | if (*cnt == 1) | |
568 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); | |
569 | else | |
570 | label = kasprintf(GFP_KERNEL, "ramoops:%s(%d/%d)", | |
571 | name, i, *cnt - 1); | |
de832092 | 572 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, |
1227daa4 KC |
573 | &cxt->ecc_info, |
574 | cxt->memtype, flags, label); | |
de832092 KC |
575 | if (IS_ERR(prz_ar[i])) { |
576 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
577 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
578 | name, record_size, | |
579 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
580 | |
581 | while (i > 0) { | |
582 | i--; | |
de832092 | 583 | persistent_ram_free(prz_ar[i]); |
4407de74 | 584 | } |
de832092 KC |
585 | kfree(prz_ar); |
586 | goto fail; | |
f4c5d242 | 587 | } |
de832092 | 588 | *paddr += zone_sz; |
f0f23e54 | 589 | prz_ar[i]->type = pstore_name_to_type(name); |
f4c5d242 AV |
590 | } |
591 | ||
de832092 | 592 | *przs = prz_ar; |
f4c5d242 | 593 | return 0; |
de832092 KC |
594 | |
595 | fail: | |
596 | *cnt = 0; | |
f4c5d242 AV |
597 | return err; |
598 | } | |
599 | ||
c443a5f3 KC |
600 | static int ramoops_init_prz(const char *name, |
601 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
602 | struct persistent_ram_zone **prz, |
603 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b | 604 | { |
1227daa4 KC |
605 | char *label; |
606 | ||
b5d38e9b AV |
607 | if (!sz) |
608 | return 0; | |
609 | ||
c6289378 | 610 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
611 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
612 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 613 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 614 | return -ENOMEM; |
c6289378 | 615 | } |
b5d38e9b | 616 | |
1227daa4 | 617 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); |
663deb47 | 618 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
7684bd33 | 619 | cxt->memtype, PRZ_FLAG_ZAP_OLD, label); |
b5d38e9b AV |
620 | if (IS_ERR(*prz)) { |
621 | int err = PTR_ERR(*prz); | |
622 | ||
c443a5f3 KC |
623 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
624 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
625 | return err; |
626 | } | |
627 | ||
b5d38e9b | 628 | *paddr += sz; |
f0f23e54 | 629 | (*prz)->type = pstore_name_to_type(name); |
b5d38e9b AV |
630 | |
631 | return 0; | |
632 | } | |
633 | ||
35da6094 GH |
634 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
635 | const char *propname, u32 *value) | |
636 | { | |
637 | u32 val32 = 0; | |
638 | int ret; | |
639 | ||
640 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
641 | if (ret < 0 && ret != -EINVAL) { | |
642 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
643 | propname, ret); | |
644 | return ret; | |
645 | } | |
646 | ||
647 | if (val32 > INT_MAX) { | |
648 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
649 | return -EOVERFLOW; | |
650 | } | |
651 | ||
652 | *value = val32; | |
653 | return 0; | |
654 | } | |
655 | ||
656 | static int ramoops_parse_dt(struct platform_device *pdev, | |
657 | struct ramoops_platform_data *pdata) | |
658 | { | |
659 | struct device_node *of_node = pdev->dev.of_node; | |
1614e921 | 660 | struct device_node *parent_node; |
529182e2 | 661 | struct resource *res; |
35da6094 GH |
662 | u32 value; |
663 | int ret; | |
664 | ||
665 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
666 | ||
529182e2 KC |
667 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
668 | if (!res) { | |
35da6094 | 669 | dev_err(&pdev->dev, |
529182e2 KC |
670 | "failed to locate DT /reserved-memory resource\n"); |
671 | return -EINVAL; | |
35da6094 GH |
672 | } |
673 | ||
529182e2 KC |
674 | pdata->mem_size = resource_size(res); |
675 | pdata->mem_address = res->start; | |
35da6094 GH |
676 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
677 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
678 | ||
679 | #define parse_size(name, field) { \ | |
680 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
681 | if (ret < 0) \ | |
682 | return ret; \ | |
683 | field = value; \ | |
684 | } | |
685 | ||
686 | parse_size("record-size", pdata->record_size); | |
687 | parse_size("console-size", pdata->console_size); | |
688 | parse_size("ftrace-size", pdata->ftrace_size); | |
689 | parse_size("pmsg-size", pdata->pmsg_size); | |
690 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
a1cf53ac | 691 | parse_size("flags", pdata->flags); |
35da6094 GH |
692 | |
693 | #undef parse_size | |
694 | ||
1614e921 DA |
695 | /* |
696 | * Some old Chromebooks relied on the kernel setting the | |
697 | * console_size and pmsg_size to the record size since that's | |
698 | * what the downstream kernel did. These same Chromebooks had | |
699 | * "ramoops" straight under the root node which isn't | |
700 | * according to the current upstream bindings (though it was | |
701 | * arguably acceptable under a prior version of the bindings). | |
702 | * Let's make those old Chromebooks work by detecting that | |
703 | * we're not a child of "reserved-memory" and mimicking the | |
704 | * expected behavior. | |
705 | */ | |
706 | parent_node = of_get_parent(of_node); | |
707 | if (!of_node_name_eq(parent_node, "reserved-memory") && | |
708 | !pdata->console_size && !pdata->ftrace_size && | |
709 | !pdata->pmsg_size && !pdata->ecc_info.ecc_size) { | |
710 | pdata->console_size = pdata->record_size; | |
711 | pdata->pmsg_size = pdata->record_size; | |
712 | } | |
713 | of_node_put(parent_node); | |
714 | ||
35da6094 GH |
715 | return 0; |
716 | } | |
717 | ||
f568f6ca | 718 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 719 | { |
896fc1f0 | 720 | struct device *dev = &pdev->dev; |
35da6094 | 721 | struct ramoops_platform_data *pdata = dev->platform_data; |
5631e857 | 722 | struct ramoops_platform_data pdata_local; |
56d611a0 | 723 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
724 | size_t dump_mem_sz; |
725 | phys_addr_t paddr; | |
56d611a0 MS |
726 | int err = -EINVAL; |
727 | ||
fc46d4e4 KC |
728 | /* |
729 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
730 | * probes. |
731 | */ | |
fc46d4e4 KC |
732 | if (cxt->max_dump_cnt) { |
733 | pr_err("already initialized\n"); | |
9ba80d99 | 734 | goto fail_out; |
fc46d4e4 KC |
735 | } |
736 | ||
1e0f67a9 YH |
737 | if (dev_of_node(dev) && !pdata) { |
738 | pdata = &pdata_local; | |
739 | memset(pdata, 0, sizeof(*pdata)); | |
740 | ||
741 | err = ramoops_parse_dt(pdev, pdata); | |
742 | if (err < 0) | |
743 | goto fail_out; | |
744 | } | |
745 | ||
fc46d4e4 KC |
746 | /* Make sure we didn't get bogus platform data pointer. */ |
747 | if (!pdata) { | |
748 | pr_err("NULL platform data\n"); | |
749 | goto fail_out; | |
750 | } | |
9ba80d99 | 751 | |
a694d1b5 | 752 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 753 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 754 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 755 | "non-zero\n"); |
9ba80d99 | 756 | goto fail_out; |
56d611a0 MS |
757 | } |
758 | ||
3bd11cf5 | 759 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 760 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 761 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 762 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 763 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 764 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
765 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
766 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 767 | |
13aefd72 MS |
768 | cxt->size = pdata->mem_size; |
769 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 770 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 771 | cxt->record_size = pdata->record_size; |
b5d38e9b | 772 | cxt->console_size = pdata->console_size; |
a694d1b5 | 773 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 774 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 775 | cxt->dump_oops = pdata->dump_oops; |
a1cf53ac | 776 | cxt->flags = pdata->flags; |
c31ad081 | 777 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 778 | |
f4c5d242 | 779 | paddr = cxt->phys_addr; |
896fc1f0 | 780 | |
9d5438f4 MS |
781 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
782 | - cxt->pmsg_size; | |
f0f23e54 | 783 | err = ramoops_init_przs("dmesg", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
784 | dump_mem_sz, cxt->record_size, |
785 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b AV |
786 | if (err) |
787 | goto fail_out; | |
788 | ||
c443a5f3 | 789 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 790 | cxt->console_size, 0); |
b5d38e9b AV |
791 | if (err) |
792 | goto fail_init_cprz; | |
793 | ||
a1cf53ac JF |
794 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
795 | ? nr_cpu_ids | |
796 | : 1; | |
c443a5f3 KC |
797 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
798 | cxt->ftrace_size, -1, | |
799 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
800 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
801 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 AV |
802 | if (err) |
803 | goto fail_init_fprz; | |
804 | ||
c443a5f3 KC |
805 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
806 | cxt->pmsg_size, 0); | |
9d5438f4 MS |
807 | if (err) |
808 | goto fail_init_mprz; | |
809 | ||
9ba80d99 | 810 | cxt->pstore.data = cxt; |
b5d38e9b | 811 | /* |
8880fa32 KC |
812 | * Prepare frontend flags based on which areas are initialized. |
813 | * For ramoops_init_przs() cases, the "max count" variable tells | |
814 | * if there are regions present. For ramoops_init_prz() cases, | |
815 | * the single region size is how to check. | |
b5d38e9b | 816 | */ |
8880fa32 KC |
817 | cxt->pstore.flags = 0; |
818 | if (cxt->max_dump_cnt) | |
819 | cxt->pstore.flags |= PSTORE_FLAGS_DMESG; | |
79d955af NK |
820 | if (cxt->console_size) |
821 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
8880fa32 | 822 | if (cxt->max_ftrace_cnt) |
79d955af NK |
823 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; |
824 | if (cxt->pmsg_size) | |
825 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 826 | |
8880fa32 KC |
827 | /* |
828 | * Since bufsize is only used for dmesg crash dumps, it | |
829 | * must match the size of the dprz record (after PRZ header | |
830 | * and ECC bytes have been accounted for). | |
831 | */ | |
832 | if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) { | |
833 | cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size; | |
834 | cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL); | |
835 | if (!cxt->pstore.buf) { | |
836 | pr_err("cannot allocate pstore crash dump buffer\n"); | |
837 | err = -ENOMEM; | |
838 | goto fail_clear; | |
839 | } | |
840 | } | |
841 | ||
9ba80d99 | 842 | err = pstore_register(&cxt->pstore); |
56d611a0 | 843 | if (err) { |
9ba80d99 | 844 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 845 | goto fail_buf; |
56d611a0 MS |
846 | } |
847 | ||
c755201e KC |
848 | /* |
849 | * Update the module parameter variables as well so they are visible | |
850 | * through /sys/module/ramoops/parameters/ | |
851 | */ | |
852 | mem_size = pdata->mem_size; | |
853 | mem_address = pdata->mem_address; | |
854 | record_size = pdata->record_size; | |
855 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
856 | ramoops_console_size = pdata->console_size; |
857 | ramoops_pmsg_size = pdata->pmsg_size; | |
858 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 859 | |
dc80b1ea | 860 | pr_info("using 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 861 | cxt->size, (unsigned long long)cxt->phys_addr, |
dc80b1ea | 862 | cxt->ecc_info.ecc_size); |
9ba80d99 | 863 | |
56d611a0 MS |
864 | return 0; |
865 | ||
9ba80d99 KC |
866 | fail_buf: |
867 | kfree(cxt->pstore.buf); | |
868 | fail_clear: | |
869 | cxt->pstore.bufsize = 0; | |
e976e564 | 870 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 871 | fail_init_mprz: |
a694d1b5 | 872 | fail_init_fprz: |
e976e564 | 873 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 874 | fail_init_cprz: |
f4c5d242 | 875 | ramoops_free_przs(cxt); |
9ba80d99 | 876 | fail_out: |
56d611a0 MS |
877 | return err; |
878 | } | |
879 | ||
ee1d2674 | 880 | static int 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 | |
9ba80d99 KC |
886 | kfree(cxt->pstore.buf); |
887 | cxt->pstore.bufsize = 0; | |
888 | ||
ee1d2674 | 889 | persistent_ram_free(cxt->mprz); |
ee1d2674 GT |
890 | persistent_ram_free(cxt->cprz); |
891 | ramoops_free_przs(cxt); | |
892 | ||
c3b92ce9 | 893 | return 0; |
56d611a0 MS |
894 | } |
895 | ||
35da6094 GH |
896 | static const struct of_device_id dt_match[] = { |
897 | { .compatible = "ramoops" }, | |
898 | {} | |
899 | }; | |
900 | ||
c3b92ce9 | 901 | static struct platform_driver ramoops_driver = { |
924d3711 | 902 | .probe = ramoops_probe, |
ee1d2674 | 903 | .remove = ramoops_remove, |
c3b92ce9 | 904 | .driver = { |
35da6094 GH |
905 | .name = "ramoops", |
906 | .of_match_table = dt_match, | |
c3b92ce9 KP |
907 | }, |
908 | }; | |
909 | ||
bac6f6cd | 910 | static inline void ramoops_unregister_dummy(void) |
c3b92ce9 | 911 | { |
bac6f6cd KC |
912 | platform_device_unregister(dummy); |
913 | dummy = NULL; | |
bac6f6cd KC |
914 | } |
915 | ||
916 | static void __init ramoops_register_dummy(void) | |
917 | { | |
182ca6e0 YH |
918 | struct ramoops_platform_data pdata; |
919 | ||
bac6f6cd KC |
920 | /* |
921 | * Prepare a dummy platform data structure to carry the module | |
922 | * parameters. If mem_size isn't set, then there are no module | |
923 | * parameters, and we can skip this. | |
924 | */ | |
924d3711 AV |
925 | if (!mem_size) |
926 | return; | |
927 | ||
928 | pr_info("using module parameters\n"); | |
929 | ||
182ca6e0 YH |
930 | memset(&pdata, 0, sizeof(pdata)); |
931 | pdata.mem_size = mem_size; | |
932 | pdata.mem_address = mem_address; | |
933 | pdata.mem_type = mem_type; | |
934 | pdata.record_size = record_size; | |
935 | pdata.console_size = ramoops_console_size; | |
936 | pdata.ftrace_size = ramoops_ftrace_size; | |
937 | pdata.pmsg_size = ramoops_pmsg_size; | |
938 | pdata.dump_oops = dump_oops; | |
939 | pdata.flags = RAMOOPS_FLAG_FTRACE_PER_CPU; | |
a1cf53ac | 940 | |
5ca5d4e6 AV |
941 | /* |
942 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
943 | * (using 1 byte for ECC isn't much of use anyway). | |
944 | */ | |
182ca6e0 | 945 | pdata.ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
946 | |
947 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
182ca6e0 | 948 | &pdata, sizeof(pdata)); |
924d3711 AV |
949 | if (IS_ERR(dummy)) { |
950 | pr_info("could not create platform device: %ld\n", | |
951 | PTR_ERR(dummy)); | |
bac6f6cd KC |
952 | dummy = NULL; |
953 | ramoops_unregister_dummy(); | |
924d3711 AV |
954 | } |
955 | } | |
956 | ||
957 | static int __init ramoops_init(void) | |
958 | { | |
bac6f6cd KC |
959 | int ret; |
960 | ||
924d3711 | 961 | ramoops_register_dummy(); |
bac6f6cd KC |
962 | ret = platform_driver_register(&ramoops_driver); |
963 | if (ret != 0) | |
964 | ramoops_unregister_dummy(); | |
965 | ||
966 | return ret; | |
c3b92ce9 | 967 | } |
41603165 | 968 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
969 | |
970 | static void __exit ramoops_exit(void) | |
971 | { | |
972 | platform_driver_unregister(&ramoops_driver); | |
bac6f6cd | 973 | ramoops_unregister_dummy(); |
c3b92ce9 | 974 | } |
56d611a0 MS |
975 | module_exit(ramoops_exit); |
976 | ||
977 | MODULE_LICENSE("GPL"); | |
978 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
979 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |