Commit | Line | Data |
---|---|---|
56d611a0 MS |
1 | /* |
2 | * RAM Oops/Panic logger | |
3 | * | |
4 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> | |
9ba80d99 | 5 | * Copyright (C) 2011 Kees Cook <keescook@chromium.org> |
56d611a0 MS |
6 | * |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
0169256e MS |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
56d611a0 | 25 | #include <linux/kernel.h> |
83c1b317 | 26 | #include <linux/err.h> |
56d611a0 | 27 | #include <linux/module.h> |
cbe7cbf5 | 28 | #include <linux/version.h> |
9ba80d99 | 29 | #include <linux/pstore.h> |
56d611a0 MS |
30 | #include <linux/io.h> |
31 | #include <linux/ioport.h> | |
c3b92ce9 | 32 | #include <linux/platform_device.h> |
13aefd72 | 33 | #include <linux/slab.h> |
24203036 | 34 | #include <linux/compiler.h> |
1894a253 | 35 | #include <linux/pstore_ram.h> |
35da6094 GH |
36 | #include <linux/of.h> |
37 | #include <linux/of_address.h> | |
56d611a0 MS |
38 | |
39 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 40 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 41 | |
3e5c4fad SI |
42 | static ulong record_size = MIN_MEM_SIZE; |
43 | module_param(record_size, ulong, 0400); | |
44 | MODULE_PARM_DESC(record_size, | |
45 | "size of each dump done on oops/panic"); | |
56d611a0 | 46 | |
b5d38e9b AV |
47 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
48 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
49 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
50 | ||
a694d1b5 AV |
51 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
52 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
53 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
54 | ||
9d5438f4 MS |
55 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
56 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
57 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
58 | ||
764fd639 | 59 | static unsigned long long mem_address; |
b90fe0c4 | 60 | module_param_hw(mem_address, ullong, other, 0400); |
56d611a0 MS |
61 | MODULE_PARM_DESC(mem_address, |
62 | "start of reserved RAM used to store oops/panic logs"); | |
63 | ||
64 | static ulong mem_size; | |
65 | module_param(mem_size, ulong, 0400); | |
66 | MODULE_PARM_DESC(mem_size, | |
67 | "size of reserved RAM used to store oops/panic logs"); | |
68 | ||
027bc8b0 TL |
69 | static unsigned int mem_type; |
70 | module_param(mem_type, uint, 0600); | |
71 | MODULE_PARM_DESC(mem_type, | |
72 | "set to 1 to try to use unbuffered memory (default 0)"); | |
73 | ||
56d611a0 MS |
74 | static int dump_oops = 1; |
75 | module_param(dump_oops, int, 0600); | |
76 | MODULE_PARM_DESC(dump_oops, | |
77 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
78 | ||
39eb7e97 AV |
79 | static int ramoops_ecc; |
80 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
81 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
82 | "if non-zero, the option enables ECC support and specifies " |
83 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
84 | "bytes ECC)"); | |
39eb7e97 | 85 | |
9ba80d99 | 86 | struct ramoops_context { |
a5d23b95 KC |
87 | struct persistent_ram_zone **dprzs; /* Oops dump zones */ |
88 | struct persistent_ram_zone *cprz; /* Console zone */ | |
89 | struct persistent_ram_zone **fprzs; /* Ftrace zones */ | |
90 | struct persistent_ram_zone *mprz; /* PMSG zone */ | |
56d611a0 MS |
91 | phys_addr_t phys_addr; |
92 | unsigned long size; | |
027bc8b0 | 93 | unsigned int memtype; |
9ba80d99 | 94 | size_t record_size; |
b5d38e9b | 95 | size_t console_size; |
a694d1b5 | 96 | size_t ftrace_size; |
9d5438f4 | 97 | size_t pmsg_size; |
6b4d2a27 | 98 | int dump_oops; |
a1cf53ac | 99 | u32 flags; |
c31ad081 | 100 | struct persistent_ram_ecc_info ecc_info; |
cac2eb7b AV |
101 | unsigned int max_dump_cnt; |
102 | unsigned int dump_write_cnt; | |
57fd8353 | 103 | /* _read_cnt need clear on ramoops_pstore_open */ |
cac2eb7b | 104 | unsigned int dump_read_cnt; |
b5d38e9b | 105 | unsigned int console_read_cnt; |
a1cf53ac | 106 | unsigned int max_ftrace_cnt; |
a694d1b5 | 107 | unsigned int ftrace_read_cnt; |
9d5438f4 | 108 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
109 | struct pstore_info pstore; |
110 | }; | |
56d611a0 | 111 | |
13aefd72 MS |
112 | static struct platform_device *dummy; |
113 | static struct ramoops_platform_data *dummy_data; | |
114 | ||
9ba80d99 KC |
115 | static int ramoops_pstore_open(struct pstore_info *psi) |
116 | { | |
117 | struct ramoops_context *cxt = psi->data; | |
118 | ||
cac2eb7b | 119 | cxt->dump_read_cnt = 0; |
b5d38e9b | 120 | cxt->console_read_cnt = 0; |
57fd8353 | 121 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 122 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
123 | return 0; |
124 | } | |
125 | ||
755d66b4 | 126 | static struct persistent_ram_zone * |
b05c9506 JFG |
127 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id, |
128 | struct pstore_record *record) | |
755d66b4 AV |
129 | { |
130 | struct persistent_ram_zone *prz; | |
b05c9506 | 131 | bool update = (record->type == PSTORE_TYPE_DMESG); |
755d66b4 | 132 | |
46418413 | 133 | /* Give up if we never existed or have hit the end. */ |
b05c9506 | 134 | if (!przs) |
755d66b4 AV |
135 | return NULL; |
136 | ||
b05c9506 | 137 | prz = przs[id]; |
b0aa931f LS |
138 | if (!prz) |
139 | return NULL; | |
755d66b4 | 140 | |
aa9a4a1e LS |
141 | /* Update old/shadowed buffer. */ |
142 | if (update) | |
755d66b4 | 143 | persistent_ram_save_old(prz); |
aa9a4a1e LS |
144 | |
145 | if (!persistent_ram_old_size(prz)) | |
146 | return NULL; | |
755d66b4 | 147 | |
b05c9506 JFG |
148 | record->type = prz->type; |
149 | record->id = id; | |
755d66b4 AV |
150 | |
151 | return prz; | |
152 | } | |
153 | ||
7aaa822e | 154 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time, |
3f8f80f0 AB |
155 | bool *compressed) |
156 | { | |
157 | char data_type; | |
a28726b4 | 158 | int header_length = 0; |
3f8f80f0 | 159 | |
e264abea AB |
160 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n", |
161 | (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type, | |
7aaa822e | 162 | &header_length) == 3) { |
3f8f80f0 AB |
163 | if (data_type == 'C') |
164 | *compressed = true; | |
165 | else | |
166 | *compressed = false; | |
e264abea AB |
167 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n", |
168 | (time64_t *)&time->tv_sec, &time->tv_nsec, | |
7aaa822e KC |
169 | &header_length) == 2) { |
170 | *compressed = false; | |
3f8f80f0 AB |
171 | } else { |
172 | time->tv_sec = 0; | |
173 | time->tv_nsec = 0; | |
174 | *compressed = false; | |
175 | } | |
a28726b4 | 176 | return header_length; |
3f8f80f0 AB |
177 | } |
178 | ||
f44f9652 MS |
179 | static bool prz_ok(struct persistent_ram_zone *prz) |
180 | { | |
181 | return !!prz && !!(persistent_ram_old_size(prz) + | |
182 | persistent_ram_ecc_string(prz, NULL, 0)); | |
183 | } | |
184 | ||
2fbea82b JF |
185 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, |
186 | struct persistent_ram_zone *src) | |
187 | { | |
188 | size_t dest_size, src_size, total, dest_off, src_off; | |
189 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; | |
190 | void *merged_buf; | |
191 | struct pstore_ftrace_record *drec, *srec, *mrec; | |
192 | size_t record_size = sizeof(struct pstore_ftrace_record); | |
193 | ||
194 | dest_off = dest->old_log_size % record_size; | |
195 | dest_size = dest->old_log_size - dest_off; | |
196 | ||
197 | src_off = src->old_log_size % record_size; | |
198 | src_size = src->old_log_size - src_off; | |
199 | ||
200 | total = dest_size + src_size; | |
201 | merged_buf = kmalloc(total, GFP_KERNEL); | |
202 | if (!merged_buf) | |
203 | return -ENOMEM; | |
204 | ||
205 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); | |
206 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); | |
207 | mrec = (struct pstore_ftrace_record *)(merged_buf); | |
208 | ||
209 | while (dest_size > 0 && src_size > 0) { | |
210 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < | |
211 | pstore_ftrace_read_timestamp(&srec[src_idx])) { | |
212 | mrec[merged_idx++] = drec[dest_idx++]; | |
213 | dest_size -= record_size; | |
214 | } else { | |
215 | mrec[merged_idx++] = srec[src_idx++]; | |
216 | src_size -= record_size; | |
217 | } | |
218 | } | |
219 | ||
220 | while (dest_size > 0) { | |
221 | mrec[merged_idx++] = drec[dest_idx++]; | |
222 | dest_size -= record_size; | |
223 | } | |
224 | ||
225 | while (src_size > 0) { | |
226 | mrec[merged_idx++] = srec[src_idx++]; | |
227 | src_size -= record_size; | |
228 | } | |
229 | ||
230 | kfree(dest->old_log); | |
231 | dest->old_log = merged_buf; | |
232 | dest->old_log_size = total; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
125cc42b | 237 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
56d611a0 | 238 | { |
2fbea82b | 239 | ssize_t size = 0; |
125cc42b | 240 | struct ramoops_context *cxt = record->psi->data; |
e036bd33 BZ |
241 | struct persistent_ram_zone *prz = NULL; |
242 | int header_length = 0; | |
2fbea82b | 243 | bool free_prz = false; |
e036bd33 | 244 | |
125cc42b KC |
245 | /* |
246 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
e036bd33 BZ |
247 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
248 | * valid time stamps, so it is initialized to zero. | |
249 | */ | |
125cc42b KC |
250 | record->time.tv_sec = 0; |
251 | record->time.tv_nsec = 0; | |
252 | record->compressed = false; | |
e036bd33 BZ |
253 | |
254 | /* Find the next valid persistent_ram_zone for DMESG */ | |
255 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
b05c9506 JFG |
256 | prz = ramoops_get_next_prz(cxt->dprzs, cxt->dump_read_cnt++, |
257 | record); | |
e036bd33 BZ |
258 | if (!prz_ok(prz)) |
259 | continue; | |
260 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
125cc42b KC |
261 | &record->time, |
262 | &record->compressed); | |
e036bd33 BZ |
263 | /* Clear and skip this DMESG record if it has no valid header */ |
264 | if (!header_length) { | |
265 | persistent_ram_free_old(prz); | |
266 | persistent_ram_zap(prz); | |
267 | prz = NULL; | |
268 | } | |
269 | } | |
9ba80d99 | 270 | |
b05c9506 JFG |
271 | if (!prz_ok(prz) && !cxt->console_read_cnt++) |
272 | prz = ramoops_get_next_prz(&cxt->cprz, 0 /* single */, record); | |
2fbea82b | 273 | |
b05c9506 JFG |
274 | if (!prz_ok(prz) && !cxt->pmsg_read_cnt++) |
275 | prz = ramoops_get_next_prz(&cxt->mprz, 0 /* single */, record); | |
2fbea82b JF |
276 | |
277 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
46418413 | 278 | if (!prz_ok(prz)) { |
b05c9506 JFG |
279 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) && |
280 | !cxt->ftrace_read_cnt++) { | |
281 | prz = ramoops_get_next_prz(cxt->fprzs, 0 /* single */, | |
282 | record); | |
2fbea82b JF |
283 | } else { |
284 | /* | |
285 | * Build a new dummy record which combines all the | |
286 | * per-cpu records including metadata and ecc info. | |
287 | */ | |
288 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
289 | ||
290 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
291 | GFP_KERNEL); | |
292 | if (!tmp_prz) | |
293 | return -ENOMEM; | |
8665569e | 294 | prz = tmp_prz; |
2fbea82b JF |
295 | free_prz = true; |
296 | ||
297 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
298 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
b05c9506 | 299 | cxt->ftrace_read_cnt++, record); |
2fbea82b JF |
300 | |
301 | if (!prz_ok(prz_next)) | |
302 | continue; | |
303 | ||
304 | tmp_prz->ecc_info = prz_next->ecc_info; | |
305 | tmp_prz->corrected_bytes += | |
306 | prz_next->corrected_bytes; | |
307 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
308 | size = ftrace_log_combine(tmp_prz, prz_next); | |
309 | if (size) | |
310 | goto out; | |
311 | } | |
125cc42b | 312 | record->id = 0; |
a1cf53ac JF |
313 | } |
314 | } | |
315 | ||
2fbea82b JF |
316 | if (!prz_ok(prz)) { |
317 | size = 0; | |
318 | goto out; | |
319 | } | |
896fc1f0 | 320 | |
e036bd33 | 321 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
322 | |
323 | /* ECC correction notice */ | |
125cc42b | 324 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 325 | |
125cc42b KC |
326 | record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
327 | if (record->buf == NULL) { | |
2fbea82b JF |
328 | size = -ENOMEM; |
329 | goto out; | |
330 | } | |
9ba80d99 | 331 | |
125cc42b KC |
332 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
333 | size); | |
2fbea82b | 334 | |
125cc42b KC |
335 | persistent_ram_ecc_string(prz, record->buf + size, |
336 | record->ecc_notice_size + 1); | |
bd08ec33 | 337 | |
2fbea82b JF |
338 | out: |
339 | if (free_prz) { | |
340 | kfree(prz->old_log); | |
341 | kfree(prz); | |
342 | } | |
343 | ||
8cfc8ddc | 344 | return size; |
9ba80d99 KC |
345 | } |
346 | ||
3f8f80f0 | 347 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
c7f3c595 | 348 | struct pstore_record *record) |
896fc1f0 AV |
349 | { |
350 | char *hdr; | |
896fc1f0 AV |
351 | size_t len; |
352 | ||
e264abea AB |
353 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n", |
354 | (time64_t)record->time.tv_sec, | |
c7f3c595 KC |
355 | record->time.tv_nsec / 1000, |
356 | record->compressed ? 'C' : 'D'); | |
896fc1f0 AV |
357 | WARN_ON_ONCE(!hdr); |
358 | len = hdr ? strlen(hdr) : 0; | |
359 | persistent_ram_write(prz, hdr, len); | |
360 | kfree(hdr); | |
361 | ||
362 | return len; | |
363 | } | |
364 | ||
4c9ec219 | 365 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
9ba80d99 | 366 | { |
b10b4711 | 367 | struct ramoops_context *cxt = record->psi->data; |
c6289378 | 368 | struct persistent_ram_zone *prz; |
b10b4711 | 369 | size_t size, hlen; |
9ba80d99 | 370 | |
b10b4711 | 371 | if (record->type == PSTORE_TYPE_CONSOLE) { |
b5d38e9b AV |
372 | if (!cxt->cprz) |
373 | return -ENOMEM; | |
b10b4711 | 374 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
b5d38e9b | 375 | return 0; |
b10b4711 | 376 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
377 | int zonenum; |
378 | ||
379 | if (!cxt->fprzs) | |
a694d1b5 | 380 | return -ENOMEM; |
a1cf53ac JF |
381 | /* |
382 | * Choose zone by if we're using per-cpu buffers. | |
383 | */ | |
384 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
385 | zonenum = smp_processor_id(); | |
386 | else | |
387 | zonenum = 0; | |
388 | ||
b10b4711 KC |
389 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
390 | record->size); | |
a694d1b5 | 391 | return 0; |
b10b4711 | 392 | } else if (record->type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
393 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
394 | return -EINVAL; | |
b5d38e9b AV |
395 | } |
396 | ||
b10b4711 | 397 | if (record->type != PSTORE_TYPE_DMESG) |
9ba80d99 | 398 | return -EINVAL; |
56d611a0 | 399 | |
b10b4711 KC |
400 | /* |
401 | * Out of the various dmesg dump types, ramoops is currently designed | |
9ba80d99 KC |
402 | * to only store crash logs, rather than storing general kernel logs. |
403 | */ | |
b10b4711 KC |
404 | if (record->reason != KMSG_DUMP_OOPS && |
405 | record->reason != KMSG_DUMP_PANIC) | |
9ba80d99 | 406 | return -EINVAL; |
fc2d557c | 407 | |
9ba80d99 | 408 | /* Skip Oopes when configured to do so. */ |
b10b4711 | 409 | if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
410 | return -EINVAL; |
411 | ||
b10b4711 KC |
412 | /* |
413 | * Explicitly only take the first part of any new crash. | |
9ba80d99 KC |
414 | * If our buffer is larger than kmsg_bytes, this can never happen, |
415 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
416 | * report split across multiple records. | |
417 | */ | |
b10b4711 | 418 | if (record->part != 1) |
9ba80d99 | 419 | return -ENOSPC; |
56d611a0 | 420 | |
a5d23b95 | 421 | if (!cxt->dprzs) |
c6289378 AH |
422 | return -ENOSPC; |
423 | ||
a5d23b95 | 424 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 425 | |
b10b4711 | 426 | /* Build header and append record contents. */ |
c7f3c595 | 427 | hlen = ramoops_write_kmsg_hdr(prz, record); |
b10b4711 | 428 | size = record->size; |
896fc1f0 AV |
429 | if (size + hlen > prz->buffer_size) |
430 | size = prz->buffer_size - hlen; | |
b10b4711 | 431 | persistent_ram_write(prz, record->buf, size); |
56d611a0 | 432 | |
cac2eb7b | 433 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
434 | |
435 | return 0; | |
436 | } | |
437 | ||
4c9ec219 KC |
438 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
439 | const char __user *buf) | |
5bf6d1b9 | 440 | { |
fdd03118 KC |
441 | if (record->type == PSTORE_TYPE_PMSG) { |
442 | struct ramoops_context *cxt = record->psi->data; | |
5bf6d1b9 MS |
443 | |
444 | if (!cxt->mprz) | |
445 | return -ENOMEM; | |
fdd03118 | 446 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
5bf6d1b9 MS |
447 | } |
448 | ||
449 | return -EINVAL; | |
450 | } | |
451 | ||
a61072aa | 452 | static int ramoops_pstore_erase(struct pstore_record *record) |
9ba80d99 | 453 | { |
a61072aa | 454 | struct ramoops_context *cxt = record->psi->data; |
b5d38e9b | 455 | struct persistent_ram_zone *prz; |
9ba80d99 | 456 | |
a61072aa | 457 | switch (record->type) { |
b5d38e9b | 458 | case PSTORE_TYPE_DMESG: |
a61072aa | 459 | if (record->id >= cxt->max_dump_cnt) |
b5d38e9b | 460 | return -EINVAL; |
a61072aa | 461 | prz = cxt->dprzs[record->id]; |
b5d38e9b AV |
462 | break; |
463 | case PSTORE_TYPE_CONSOLE: | |
464 | prz = cxt->cprz; | |
465 | break; | |
a694d1b5 | 466 | case PSTORE_TYPE_FTRACE: |
a61072aa | 467 | if (record->id >= cxt->max_ftrace_cnt) |
a1cf53ac | 468 | return -EINVAL; |
a61072aa | 469 | prz = cxt->fprzs[record->id]; |
a694d1b5 | 470 | break; |
9d5438f4 MS |
471 | case PSTORE_TYPE_PMSG: |
472 | prz = cxt->mprz; | |
473 | break; | |
b5d38e9b | 474 | default: |
9ba80d99 | 475 | return -EINVAL; |
b5d38e9b | 476 | } |
9ba80d99 | 477 | |
b5d38e9b AV |
478 | persistent_ram_free_old(prz); |
479 | persistent_ram_zap(prz); | |
9ba80d99 KC |
480 | |
481 | return 0; | |
56d611a0 MS |
482 | } |
483 | ||
9ba80d99 KC |
484 | static struct ramoops_context oops_cxt = { |
485 | .pstore = { | |
486 | .owner = THIS_MODULE, | |
487 | .name = "ramoops", | |
488 | .open = ramoops_pstore_open, | |
489 | .read = ramoops_pstore_read, | |
4c9ec219 KC |
490 | .write = ramoops_pstore_write, |
491 | .write_user = ramoops_pstore_write_user, | |
9ba80d99 KC |
492 | .erase = ramoops_pstore_erase, |
493 | }, | |
494 | }; | |
495 | ||
f4c5d242 AV |
496 | static void ramoops_free_przs(struct ramoops_context *cxt) |
497 | { | |
498 | int i; | |
499 | ||
a1cf53ac | 500 | /* Free dump PRZs */ |
a5d23b95 | 501 | if (cxt->dprzs) { |
a1cf53ac | 502 | for (i = 0; i < cxt->max_dump_cnt; i++) |
a5d23b95 | 503 | persistent_ram_free(cxt->dprzs[i]); |
f4c5d242 | 504 | |
a5d23b95 | 505 | kfree(cxt->dprzs); |
a1cf53ac JF |
506 | cxt->max_dump_cnt = 0; |
507 | } | |
4407de74 | 508 | |
a1cf53ac JF |
509 | /* Free ftrace PRZs */ |
510 | if (cxt->fprzs) { | |
511 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
512 | persistent_ram_free(cxt->fprzs[i]); | |
513 | kfree(cxt->fprzs); | |
514 | cxt->max_ftrace_cnt = 0; | |
515 | } | |
f4c5d242 AV |
516 | } |
517 | ||
c443a5f3 KC |
518 | static int ramoops_init_przs(const char *name, |
519 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
520 | struct persistent_ram_zone ***przs, |
521 | phys_addr_t *paddr, size_t mem_sz, | |
522 | ssize_t record_size, | |
523 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
524 | { |
525 | int err = -ENOMEM; | |
526 | int i; | |
de832092 KC |
527 | size_t zone_sz; |
528 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 529 | |
de832092 KC |
530 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
531 | if (mem_sz == 0 || record_size == 0) { | |
532 | *cnt = 0; | |
f4c5d242 | 533 | return 0; |
c6289378 AH |
534 | } |
535 | ||
de832092 KC |
536 | /* |
537 | * If we have a negative record size, calculate it based on | |
538 | * mem_sz / *cnt. If we have a positive record size, calculate | |
539 | * cnt from mem_sz / record_size. | |
540 | */ | |
541 | if (record_size < 0) { | |
542 | if (*cnt == 0) | |
543 | return 0; | |
544 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
545 | if (record_size == 0) { |
546 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
547 | name, mem_sz, *cnt); | |
de832092 | 548 | goto fail; |
c443a5f3 | 549 | } |
de832092 KC |
550 | } else { |
551 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
552 | if (*cnt == 0) { |
553 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
554 | name, mem_sz, record_size); | |
de832092 | 555 | goto fail; |
c443a5f3 | 556 | } |
de832092 | 557 | } |
f4c5d242 | 558 | |
de832092 | 559 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
560 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
561 | name, | |
de832092 KC |
562 | mem_sz, (unsigned long long)*paddr, |
563 | cxt->size, (unsigned long long)cxt->phys_addr); | |
564 | goto fail; | |
f4c5d242 AV |
565 | } |
566 | ||
de832092 | 567 | zone_sz = mem_sz / *cnt; |
c443a5f3 KC |
568 | if (!zone_sz) { |
569 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 570 | goto fail; |
c443a5f3 | 571 | } |
de832092 KC |
572 | |
573 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
574 | if (!prz_ar) | |
575 | goto fail; | |
576 | ||
577 | for (i = 0; i < *cnt; i++) { | |
1227daa4 KC |
578 | char *label; |
579 | ||
580 | if (*cnt == 1) | |
581 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); | |
582 | else | |
583 | label = kasprintf(GFP_KERNEL, "ramoops:%s(%d/%d)", | |
584 | name, i, *cnt - 1); | |
de832092 | 585 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, |
1227daa4 KC |
586 | &cxt->ecc_info, |
587 | cxt->memtype, flags, label); | |
de832092 KC |
588 | if (IS_ERR(prz_ar[i])) { |
589 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
590 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
591 | name, record_size, | |
592 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
593 | |
594 | while (i > 0) { | |
595 | i--; | |
de832092 | 596 | persistent_ram_free(prz_ar[i]); |
4407de74 | 597 | } |
de832092 KC |
598 | kfree(prz_ar); |
599 | goto fail; | |
f4c5d242 | 600 | } |
de832092 | 601 | *paddr += zone_sz; |
f0f23e54 | 602 | prz_ar[i]->type = pstore_name_to_type(name); |
f4c5d242 AV |
603 | } |
604 | ||
de832092 | 605 | *przs = prz_ar; |
f4c5d242 | 606 | return 0; |
de832092 KC |
607 | |
608 | fail: | |
609 | *cnt = 0; | |
f4c5d242 AV |
610 | return err; |
611 | } | |
612 | ||
c443a5f3 KC |
613 | static int ramoops_init_prz(const char *name, |
614 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
615 | struct persistent_ram_zone **prz, |
616 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b | 617 | { |
1227daa4 KC |
618 | char *label; |
619 | ||
b5d38e9b AV |
620 | if (!sz) |
621 | return 0; | |
622 | ||
c6289378 | 623 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
624 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
625 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 626 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 627 | return -ENOMEM; |
c6289378 | 628 | } |
b5d38e9b | 629 | |
1227daa4 | 630 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); |
663deb47 | 631 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
7684bd33 | 632 | cxt->memtype, PRZ_FLAG_ZAP_OLD, label); |
b5d38e9b AV |
633 | if (IS_ERR(*prz)) { |
634 | int err = PTR_ERR(*prz); | |
635 | ||
c443a5f3 KC |
636 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
637 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
638 | return err; |
639 | } | |
640 | ||
b5d38e9b | 641 | *paddr += sz; |
f0f23e54 | 642 | (*prz)->type = pstore_name_to_type(name); |
b5d38e9b AV |
643 | |
644 | return 0; | |
645 | } | |
646 | ||
35da6094 GH |
647 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
648 | const char *propname, u32 *value) | |
649 | { | |
650 | u32 val32 = 0; | |
651 | int ret; | |
652 | ||
653 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
654 | if (ret < 0 && ret != -EINVAL) { | |
655 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
656 | propname, ret); | |
657 | return ret; | |
658 | } | |
659 | ||
660 | if (val32 > INT_MAX) { | |
661 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
662 | return -EOVERFLOW; | |
663 | } | |
664 | ||
665 | *value = val32; | |
666 | return 0; | |
667 | } | |
668 | ||
669 | static int ramoops_parse_dt(struct platform_device *pdev, | |
670 | struct ramoops_platform_data *pdata) | |
671 | { | |
672 | struct device_node *of_node = pdev->dev.of_node; | |
529182e2 | 673 | struct resource *res; |
35da6094 GH |
674 | u32 value; |
675 | int ret; | |
676 | ||
677 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
678 | ||
529182e2 KC |
679 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
680 | if (!res) { | |
35da6094 | 681 | dev_err(&pdev->dev, |
529182e2 KC |
682 | "failed to locate DT /reserved-memory resource\n"); |
683 | return -EINVAL; | |
35da6094 GH |
684 | } |
685 | ||
529182e2 KC |
686 | pdata->mem_size = resource_size(res); |
687 | pdata->mem_address = res->start; | |
35da6094 GH |
688 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
689 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
690 | ||
691 | #define parse_size(name, field) { \ | |
692 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
693 | if (ret < 0) \ | |
694 | return ret; \ | |
695 | field = value; \ | |
696 | } | |
697 | ||
698 | parse_size("record-size", pdata->record_size); | |
699 | parse_size("console-size", pdata->console_size); | |
700 | parse_size("ftrace-size", pdata->ftrace_size); | |
701 | parse_size("pmsg-size", pdata->pmsg_size); | |
702 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
a1cf53ac | 703 | parse_size("flags", pdata->flags); |
35da6094 GH |
704 | |
705 | #undef parse_size | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
f568f6ca | 710 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 711 | { |
896fc1f0 | 712 | struct device *dev = &pdev->dev; |
35da6094 | 713 | struct ramoops_platform_data *pdata = dev->platform_data; |
56d611a0 | 714 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
715 | size_t dump_mem_sz; |
716 | phys_addr_t paddr; | |
56d611a0 MS |
717 | int err = -EINVAL; |
718 | ||
35da6094 GH |
719 | if (dev_of_node(dev) && !pdata) { |
720 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
721 | if (!pdata) { | |
c443a5f3 | 722 | pr_err("cannot allocate platform data buffer\n"); |
35da6094 GH |
723 | err = -ENOMEM; |
724 | goto fail_out; | |
725 | } | |
726 | ||
727 | err = ramoops_parse_dt(pdev, pdata); | |
728 | if (err < 0) | |
729 | goto fail_out; | |
730 | } | |
731 | ||
fc46d4e4 KC |
732 | /* |
733 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
734 | * probes. |
735 | */ | |
fc46d4e4 KC |
736 | if (cxt->max_dump_cnt) { |
737 | pr_err("already initialized\n"); | |
9ba80d99 | 738 | goto fail_out; |
fc46d4e4 KC |
739 | } |
740 | ||
741 | /* Make sure we didn't get bogus platform data pointer. */ | |
742 | if (!pdata) { | |
743 | pr_err("NULL platform data\n"); | |
744 | goto fail_out; | |
745 | } | |
9ba80d99 | 746 | |
a694d1b5 | 747 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 748 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 749 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 750 | "non-zero\n"); |
9ba80d99 | 751 | goto fail_out; |
56d611a0 MS |
752 | } |
753 | ||
3bd11cf5 | 754 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 755 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 756 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 757 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 758 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 759 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
760 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
761 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 762 | |
13aefd72 MS |
763 | cxt->size = pdata->mem_size; |
764 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 765 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 766 | cxt->record_size = pdata->record_size; |
b5d38e9b | 767 | cxt->console_size = pdata->console_size; |
a694d1b5 | 768 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 769 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 770 | cxt->dump_oops = pdata->dump_oops; |
a1cf53ac | 771 | cxt->flags = pdata->flags; |
c31ad081 | 772 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 773 | |
f4c5d242 | 774 | paddr = cxt->phys_addr; |
896fc1f0 | 775 | |
9d5438f4 MS |
776 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
777 | - cxt->pmsg_size; | |
f0f23e54 | 778 | err = ramoops_init_przs("dmesg", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
779 | dump_mem_sz, cxt->record_size, |
780 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b AV |
781 | if (err) |
782 | goto fail_out; | |
783 | ||
c443a5f3 | 784 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 785 | cxt->console_size, 0); |
b5d38e9b AV |
786 | if (err) |
787 | goto fail_init_cprz; | |
788 | ||
a1cf53ac JF |
789 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
790 | ? nr_cpu_ids | |
791 | : 1; | |
c443a5f3 KC |
792 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
793 | cxt->ftrace_size, -1, | |
794 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
795 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
796 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 AV |
797 | if (err) |
798 | goto fail_init_fprz; | |
799 | ||
c443a5f3 KC |
800 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
801 | cxt->pmsg_size, 0); | |
9d5438f4 MS |
802 | if (err) |
803 | goto fail_init_mprz; | |
804 | ||
9ba80d99 | 805 | cxt->pstore.data = cxt; |
b5d38e9b | 806 | /* |
89d328f6 KC |
807 | * Since bufsize is only used for dmesg crash dumps, it |
808 | * must match the size of the dprz record (after PRZ header | |
809 | * and ECC bytes have been accounted for). | |
b5d38e9b | 810 | */ |
89d328f6 KC |
811 | cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size; |
812 | cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL); | |
9ba80d99 | 813 | if (!cxt->pstore.buf) { |
89d328f6 | 814 | pr_err("cannot allocate pstore crash dump buffer\n"); |
47110b88 | 815 | err = -ENOMEM; |
9ba80d99 KC |
816 | goto fail_clear; |
817 | } | |
818 | ||
79d955af NK |
819 | cxt->pstore.flags = PSTORE_FLAGS_DMESG; |
820 | if (cxt->console_size) | |
821 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
822 | if (cxt->ftrace_size) | |
823 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; | |
824 | if (cxt->pmsg_size) | |
825 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 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; | |
840 | dump_oops = pdata->dump_oops; | |
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; | |
899 | ||
900 | kfree(dummy_data); | |
901 | dummy_data = NULL; | |
902 | } | |
903 | ||
904 | static void __init ramoops_register_dummy(void) | |
905 | { | |
906 | /* | |
907 | * Prepare a dummy platform data structure to carry the module | |
908 | * parameters. If mem_size isn't set, then there are no module | |
909 | * parameters, and we can skip this. | |
910 | */ | |
924d3711 AV |
911 | if (!mem_size) |
912 | return; | |
913 | ||
914 | pr_info("using module parameters\n"); | |
915 | ||
916 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
917 | if (!dummy_data) { | |
918 | pr_info("could not allocate pdata\n"); | |
919 | return; | |
13aefd72 MS |
920 | } |
921 | ||
924d3711 AV |
922 | dummy_data->mem_size = mem_size; |
923 | dummy_data->mem_address = mem_address; | |
07855056 | 924 | dummy_data->mem_type = mem_type; |
924d3711 AV |
925 | dummy_data->record_size = record_size; |
926 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 927 | dummy_data->ftrace_size = ramoops_ftrace_size; |
9d5438f4 | 928 | dummy_data->pmsg_size = ramoops_pmsg_size; |
924d3711 | 929 | dummy_data->dump_oops = dump_oops; |
a1cf53ac JF |
930 | dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU; |
931 | ||
5ca5d4e6 AV |
932 | /* |
933 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
934 | * (using 1 byte for ECC isn't much of use anyway). | |
935 | */ | |
c31ad081 | 936 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
937 | |
938 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
939 | dummy_data, sizeof(struct ramoops_platform_data)); | |
940 | if (IS_ERR(dummy)) { | |
941 | pr_info("could not create platform device: %ld\n", | |
942 | PTR_ERR(dummy)); | |
bac6f6cd KC |
943 | dummy = NULL; |
944 | ramoops_unregister_dummy(); | |
924d3711 AV |
945 | } |
946 | } | |
947 | ||
948 | static int __init ramoops_init(void) | |
949 | { | |
bac6f6cd KC |
950 | int ret; |
951 | ||
924d3711 | 952 | ramoops_register_dummy(); |
bac6f6cd KC |
953 | ret = platform_driver_register(&ramoops_driver); |
954 | if (ret != 0) | |
955 | ramoops_unregister_dummy(); | |
956 | ||
957 | return ret; | |
c3b92ce9 | 958 | } |
41603165 | 959 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
960 | |
961 | static void __exit ramoops_exit(void) | |
962 | { | |
963 | platform_driver_unregister(&ramoops_driver); | |
bac6f6cd | 964 | ramoops_unregister_dummy(); |
c3b92ce9 | 965 | } |
56d611a0 MS |
966 | module_exit(ramoops_exit); |
967 | ||
968 | MODULE_LICENSE("GPL"); | |
969 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
970 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |