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) { |
3f8f80f0 AB |
147 | if (data_type == 'C') |
148 | *compressed = true; | |
149 | else | |
150 | *compressed = false; | |
e264abea AB |
151 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n", |
152 | (time64_t *)&time->tv_sec, &time->tv_nsec, | |
7aaa822e KC |
153 | &header_length) == 2) { |
154 | *compressed = false; | |
3f8f80f0 AB |
155 | } else { |
156 | time->tv_sec = 0; | |
157 | time->tv_nsec = 0; | |
158 | *compressed = false; | |
159 | } | |
a28726b4 | 160 | return header_length; |
3f8f80f0 AB |
161 | } |
162 | ||
f44f9652 MS |
163 | static bool prz_ok(struct persistent_ram_zone *prz) |
164 | { | |
165 | return !!prz && !!(persistent_ram_old_size(prz) + | |
166 | persistent_ram_ecc_string(prz, NULL, 0)); | |
167 | } | |
168 | ||
2fbea82b JF |
169 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, |
170 | struct persistent_ram_zone *src) | |
171 | { | |
172 | size_t dest_size, src_size, total, dest_off, src_off; | |
173 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; | |
174 | void *merged_buf; | |
175 | struct pstore_ftrace_record *drec, *srec, *mrec; | |
176 | size_t record_size = sizeof(struct pstore_ftrace_record); | |
177 | ||
178 | dest_off = dest->old_log_size % record_size; | |
179 | dest_size = dest->old_log_size - dest_off; | |
180 | ||
181 | src_off = src->old_log_size % record_size; | |
182 | src_size = src->old_log_size - src_off; | |
183 | ||
184 | total = dest_size + src_size; | |
185 | merged_buf = kmalloc(total, GFP_KERNEL); | |
186 | if (!merged_buf) | |
187 | return -ENOMEM; | |
188 | ||
189 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); | |
190 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); | |
191 | mrec = (struct pstore_ftrace_record *)(merged_buf); | |
192 | ||
193 | while (dest_size > 0 && src_size > 0) { | |
194 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < | |
195 | pstore_ftrace_read_timestamp(&srec[src_idx])) { | |
196 | mrec[merged_idx++] = drec[dest_idx++]; | |
197 | dest_size -= record_size; | |
198 | } else { | |
199 | mrec[merged_idx++] = srec[src_idx++]; | |
200 | src_size -= record_size; | |
201 | } | |
202 | } | |
203 | ||
204 | while (dest_size > 0) { | |
205 | mrec[merged_idx++] = drec[dest_idx++]; | |
206 | dest_size -= record_size; | |
207 | } | |
208 | ||
209 | while (src_size > 0) { | |
210 | mrec[merged_idx++] = srec[src_idx++]; | |
211 | src_size -= record_size; | |
212 | } | |
213 | ||
214 | kfree(dest->old_log); | |
215 | dest->old_log = merged_buf; | |
216 | dest->old_log_size = total; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
125cc42b | 221 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
56d611a0 | 222 | { |
2fbea82b | 223 | ssize_t size = 0; |
125cc42b | 224 | struct ramoops_context *cxt = record->psi->data; |
e036bd33 BZ |
225 | struct persistent_ram_zone *prz = NULL; |
226 | int header_length = 0; | |
2fbea82b | 227 | bool free_prz = false; |
e036bd33 | 228 | |
125cc42b KC |
229 | /* |
230 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
e036bd33 BZ |
231 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
232 | * valid time stamps, so it is initialized to zero. | |
233 | */ | |
125cc42b KC |
234 | record->time.tv_sec = 0; |
235 | record->time.tv_nsec = 0; | |
236 | record->compressed = false; | |
e036bd33 BZ |
237 | |
238 | /* Find the next valid persistent_ram_zone for DMESG */ | |
239 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
b05c9506 JFG |
240 | prz = ramoops_get_next_prz(cxt->dprzs, cxt->dump_read_cnt++, |
241 | record); | |
e036bd33 BZ |
242 | if (!prz_ok(prz)) |
243 | continue; | |
244 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
125cc42b KC |
245 | &record->time, |
246 | &record->compressed); | |
e036bd33 BZ |
247 | /* Clear and skip this DMESG record if it has no valid header */ |
248 | if (!header_length) { | |
249 | persistent_ram_free_old(prz); | |
250 | persistent_ram_zap(prz); | |
251 | prz = NULL; | |
252 | } | |
253 | } | |
9ba80d99 | 254 | |
b05c9506 JFG |
255 | if (!prz_ok(prz) && !cxt->console_read_cnt++) |
256 | prz = ramoops_get_next_prz(&cxt->cprz, 0 /* single */, record); | |
2fbea82b | 257 | |
b05c9506 JFG |
258 | if (!prz_ok(prz) && !cxt->pmsg_read_cnt++) |
259 | prz = ramoops_get_next_prz(&cxt->mprz, 0 /* single */, record); | |
2fbea82b JF |
260 | |
261 | /* ftrace is last since it may want to dynamically allocate memory. */ | |
46418413 | 262 | if (!prz_ok(prz)) { |
b05c9506 JFG |
263 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) && |
264 | !cxt->ftrace_read_cnt++) { | |
265 | prz = ramoops_get_next_prz(cxt->fprzs, 0 /* single */, | |
266 | record); | |
2fbea82b JF |
267 | } else { |
268 | /* | |
269 | * Build a new dummy record which combines all the | |
270 | * per-cpu records including metadata and ecc info. | |
271 | */ | |
272 | struct persistent_ram_zone *tmp_prz, *prz_next; | |
273 | ||
274 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), | |
275 | GFP_KERNEL); | |
276 | if (!tmp_prz) | |
277 | return -ENOMEM; | |
8665569e | 278 | prz = tmp_prz; |
2fbea82b JF |
279 | free_prz = true; |
280 | ||
281 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { | |
282 | prz_next = ramoops_get_next_prz(cxt->fprzs, | |
b05c9506 | 283 | cxt->ftrace_read_cnt++, record); |
2fbea82b JF |
284 | |
285 | if (!prz_ok(prz_next)) | |
286 | continue; | |
287 | ||
288 | tmp_prz->ecc_info = prz_next->ecc_info; | |
289 | tmp_prz->corrected_bytes += | |
290 | prz_next->corrected_bytes; | |
291 | tmp_prz->bad_blocks += prz_next->bad_blocks; | |
292 | size = ftrace_log_combine(tmp_prz, prz_next); | |
293 | if (size) | |
294 | goto out; | |
295 | } | |
125cc42b | 296 | record->id = 0; |
a1cf53ac JF |
297 | } |
298 | } | |
299 | ||
2fbea82b JF |
300 | if (!prz_ok(prz)) { |
301 | size = 0; | |
302 | goto out; | |
303 | } | |
896fc1f0 | 304 | |
e036bd33 | 305 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
306 | |
307 | /* ECC correction notice */ | |
125cc42b | 308 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 309 | |
125cc42b KC |
310 | record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
311 | if (record->buf == NULL) { | |
2fbea82b JF |
312 | size = -ENOMEM; |
313 | goto out; | |
314 | } | |
9ba80d99 | 315 | |
125cc42b KC |
316 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
317 | size); | |
2fbea82b | 318 | |
125cc42b KC |
319 | persistent_ram_ecc_string(prz, record->buf + size, |
320 | record->ecc_notice_size + 1); | |
bd08ec33 | 321 | |
2fbea82b JF |
322 | out: |
323 | if (free_prz) { | |
324 | kfree(prz->old_log); | |
325 | kfree(prz); | |
326 | } | |
327 | ||
8cfc8ddc | 328 | return size; |
9ba80d99 KC |
329 | } |
330 | ||
3f8f80f0 | 331 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
c7f3c595 | 332 | struct pstore_record *record) |
896fc1f0 | 333 | { |
93ee4b7d | 334 | char hdr[36]; /* "===="(4), %lld(20), "."(1), %06lu(6), "-%c\n"(3) */ |
896fc1f0 AV |
335 | size_t len; |
336 | ||
93ee4b7d KC |
337 | len = scnprintf(hdr, sizeof(hdr), |
338 | RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n", | |
e264abea | 339 | (time64_t)record->time.tv_sec, |
c7f3c595 KC |
340 | record->time.tv_nsec / 1000, |
341 | record->compressed ? 'C' : 'D'); | |
896fc1f0 | 342 | persistent_ram_write(prz, hdr, len); |
896fc1f0 AV |
343 | |
344 | return len; | |
345 | } | |
346 | ||
4c9ec219 | 347 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
9ba80d99 | 348 | { |
b10b4711 | 349 | struct ramoops_context *cxt = record->psi->data; |
c6289378 | 350 | struct persistent_ram_zone *prz; |
b10b4711 | 351 | size_t size, hlen; |
9ba80d99 | 352 | |
b10b4711 | 353 | if (record->type == PSTORE_TYPE_CONSOLE) { |
b5d38e9b AV |
354 | if (!cxt->cprz) |
355 | return -ENOMEM; | |
b10b4711 | 356 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
b5d38e9b | 357 | return 0; |
b10b4711 | 358 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
a1cf53ac JF |
359 | int zonenum; |
360 | ||
361 | if (!cxt->fprzs) | |
a694d1b5 | 362 | return -ENOMEM; |
a1cf53ac JF |
363 | /* |
364 | * Choose zone by if we're using per-cpu buffers. | |
365 | */ | |
366 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) | |
367 | zonenum = smp_processor_id(); | |
368 | else | |
369 | zonenum = 0; | |
370 | ||
b10b4711 KC |
371 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
372 | record->size); | |
a694d1b5 | 373 | return 0; |
b10b4711 | 374 | } else if (record->type == PSTORE_TYPE_PMSG) { |
d8991f51 JF |
375 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
376 | return -EINVAL; | |
b5d38e9b AV |
377 | } |
378 | ||
b10b4711 | 379 | if (record->type != PSTORE_TYPE_DMESG) |
9ba80d99 | 380 | return -EINVAL; |
56d611a0 | 381 | |
b10b4711 KC |
382 | /* |
383 | * Out of the various dmesg dump types, ramoops is currently designed | |
9ba80d99 KC |
384 | * to only store crash logs, rather than storing general kernel logs. |
385 | */ | |
b10b4711 KC |
386 | if (record->reason != KMSG_DUMP_OOPS && |
387 | record->reason != KMSG_DUMP_PANIC) | |
9ba80d99 | 388 | return -EINVAL; |
fc2d557c | 389 | |
9ba80d99 | 390 | /* Skip Oopes when configured to do so. */ |
b10b4711 | 391 | if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
392 | return -EINVAL; |
393 | ||
b10b4711 KC |
394 | /* |
395 | * Explicitly only take the first part of any new crash. | |
9ba80d99 KC |
396 | * If our buffer is larger than kmsg_bytes, this can never happen, |
397 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
398 | * report split across multiple records. | |
399 | */ | |
b10b4711 | 400 | if (record->part != 1) |
9ba80d99 | 401 | return -ENOSPC; |
56d611a0 | 402 | |
a5d23b95 | 403 | if (!cxt->dprzs) |
c6289378 AH |
404 | return -ENOSPC; |
405 | ||
a5d23b95 | 406 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
c6289378 | 407 | |
b10b4711 | 408 | /* Build header and append record contents. */ |
c7f3c595 | 409 | hlen = ramoops_write_kmsg_hdr(prz, record); |
47afd7ae YH |
410 | if (!hlen) |
411 | return -ENOMEM; | |
412 | ||
b10b4711 | 413 | size = record->size; |
896fc1f0 AV |
414 | if (size + hlen > prz->buffer_size) |
415 | size = prz->buffer_size - hlen; | |
b10b4711 | 416 | persistent_ram_write(prz, record->buf, size); |
56d611a0 | 417 | |
cac2eb7b | 418 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
419 | |
420 | return 0; | |
421 | } | |
422 | ||
4c9ec219 KC |
423 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
424 | const char __user *buf) | |
5bf6d1b9 | 425 | { |
fdd03118 KC |
426 | if (record->type == PSTORE_TYPE_PMSG) { |
427 | struct ramoops_context *cxt = record->psi->data; | |
5bf6d1b9 MS |
428 | |
429 | if (!cxt->mprz) | |
430 | return -ENOMEM; | |
fdd03118 | 431 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
5bf6d1b9 MS |
432 | } |
433 | ||
434 | return -EINVAL; | |
435 | } | |
436 | ||
a61072aa | 437 | static int ramoops_pstore_erase(struct pstore_record *record) |
9ba80d99 | 438 | { |
a61072aa | 439 | struct ramoops_context *cxt = record->psi->data; |
b5d38e9b | 440 | struct persistent_ram_zone *prz; |
9ba80d99 | 441 | |
a61072aa | 442 | switch (record->type) { |
b5d38e9b | 443 | case PSTORE_TYPE_DMESG: |
a61072aa | 444 | if (record->id >= cxt->max_dump_cnt) |
b5d38e9b | 445 | return -EINVAL; |
a61072aa | 446 | prz = cxt->dprzs[record->id]; |
b5d38e9b AV |
447 | break; |
448 | case PSTORE_TYPE_CONSOLE: | |
449 | prz = cxt->cprz; | |
450 | break; | |
a694d1b5 | 451 | case PSTORE_TYPE_FTRACE: |
a61072aa | 452 | if (record->id >= cxt->max_ftrace_cnt) |
a1cf53ac | 453 | return -EINVAL; |
a61072aa | 454 | prz = cxt->fprzs[record->id]; |
a694d1b5 | 455 | break; |
9d5438f4 MS |
456 | case PSTORE_TYPE_PMSG: |
457 | prz = cxt->mprz; | |
458 | break; | |
b5d38e9b | 459 | default: |
9ba80d99 | 460 | return -EINVAL; |
b5d38e9b | 461 | } |
9ba80d99 | 462 | |
b5d38e9b AV |
463 | persistent_ram_free_old(prz); |
464 | persistent_ram_zap(prz); | |
9ba80d99 KC |
465 | |
466 | return 0; | |
56d611a0 MS |
467 | } |
468 | ||
9ba80d99 KC |
469 | static struct ramoops_context oops_cxt = { |
470 | .pstore = { | |
471 | .owner = THIS_MODULE, | |
472 | .name = "ramoops", | |
473 | .open = ramoops_pstore_open, | |
474 | .read = ramoops_pstore_read, | |
4c9ec219 KC |
475 | .write = ramoops_pstore_write, |
476 | .write_user = ramoops_pstore_write_user, | |
9ba80d99 KC |
477 | .erase = ramoops_pstore_erase, |
478 | }, | |
479 | }; | |
480 | ||
f4c5d242 AV |
481 | static void ramoops_free_przs(struct ramoops_context *cxt) |
482 | { | |
483 | int i; | |
484 | ||
a1cf53ac | 485 | /* Free dump PRZs */ |
a5d23b95 | 486 | if (cxt->dprzs) { |
a1cf53ac | 487 | for (i = 0; i < cxt->max_dump_cnt; i++) |
a5d23b95 | 488 | persistent_ram_free(cxt->dprzs[i]); |
f4c5d242 | 489 | |
a5d23b95 | 490 | kfree(cxt->dprzs); |
a1cf53ac JF |
491 | cxt->max_dump_cnt = 0; |
492 | } | |
4407de74 | 493 | |
a1cf53ac JF |
494 | /* Free ftrace PRZs */ |
495 | if (cxt->fprzs) { | |
496 | for (i = 0; i < cxt->max_ftrace_cnt; i++) | |
497 | persistent_ram_free(cxt->fprzs[i]); | |
498 | kfree(cxt->fprzs); | |
499 | cxt->max_ftrace_cnt = 0; | |
500 | } | |
f4c5d242 AV |
501 | } |
502 | ||
c443a5f3 KC |
503 | static int ramoops_init_przs(const char *name, |
504 | struct device *dev, struct ramoops_context *cxt, | |
de832092 KC |
505 | struct persistent_ram_zone ***przs, |
506 | phys_addr_t *paddr, size_t mem_sz, | |
507 | ssize_t record_size, | |
508 | unsigned int *cnt, u32 sig, u32 flags) | |
f4c5d242 AV |
509 | { |
510 | int err = -ENOMEM; | |
511 | int i; | |
de832092 KC |
512 | size_t zone_sz; |
513 | struct persistent_ram_zone **prz_ar; | |
f4c5d242 | 514 | |
de832092 KC |
515 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
516 | if (mem_sz == 0 || record_size == 0) { | |
517 | *cnt = 0; | |
f4c5d242 | 518 | return 0; |
c6289378 AH |
519 | } |
520 | ||
de832092 KC |
521 | /* |
522 | * If we have a negative record size, calculate it based on | |
523 | * mem_sz / *cnt. If we have a positive record size, calculate | |
524 | * cnt from mem_sz / record_size. | |
525 | */ | |
526 | if (record_size < 0) { | |
527 | if (*cnt == 0) | |
528 | return 0; | |
529 | record_size = mem_sz / *cnt; | |
c443a5f3 KC |
530 | if (record_size == 0) { |
531 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", | |
532 | name, mem_sz, *cnt); | |
de832092 | 533 | goto fail; |
c443a5f3 | 534 | } |
de832092 KC |
535 | } else { |
536 | *cnt = mem_sz / record_size; | |
c443a5f3 KC |
537 | if (*cnt == 0) { |
538 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", | |
539 | name, mem_sz, record_size); | |
de832092 | 540 | goto fail; |
c443a5f3 | 541 | } |
de832092 | 542 | } |
f4c5d242 | 543 | |
de832092 | 544 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
545 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
546 | name, | |
de832092 KC |
547 | mem_sz, (unsigned long long)*paddr, |
548 | cxt->size, (unsigned long long)cxt->phys_addr); | |
549 | goto fail; | |
f4c5d242 AV |
550 | } |
551 | ||
de832092 | 552 | zone_sz = mem_sz / *cnt; |
c443a5f3 KC |
553 | if (!zone_sz) { |
554 | dev_err(dev, "%s zone size == 0\n", name); | |
de832092 | 555 | goto fail; |
c443a5f3 | 556 | } |
de832092 KC |
557 | |
558 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); | |
559 | if (!prz_ar) | |
560 | goto fail; | |
561 | ||
562 | for (i = 0; i < *cnt; i++) { | |
1227daa4 KC |
563 | char *label; |
564 | ||
565 | if (*cnt == 1) | |
566 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); | |
567 | else | |
568 | label = kasprintf(GFP_KERNEL, "ramoops:%s(%d/%d)", | |
569 | name, i, *cnt - 1); | |
de832092 | 570 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, |
1227daa4 KC |
571 | &cxt->ecc_info, |
572 | cxt->memtype, flags, label); | |
de832092 KC |
573 | if (IS_ERR(prz_ar[i])) { |
574 | err = PTR_ERR(prz_ar[i]); | |
c443a5f3 KC |
575 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
576 | name, record_size, | |
577 | (unsigned long long)*paddr, err); | |
4407de74 SAS |
578 | |
579 | while (i > 0) { | |
580 | i--; | |
de832092 | 581 | persistent_ram_free(prz_ar[i]); |
4407de74 | 582 | } |
de832092 KC |
583 | kfree(prz_ar); |
584 | goto fail; | |
f4c5d242 | 585 | } |
de832092 | 586 | *paddr += zone_sz; |
f0f23e54 | 587 | prz_ar[i]->type = pstore_name_to_type(name); |
f4c5d242 AV |
588 | } |
589 | ||
de832092 | 590 | *przs = prz_ar; |
f4c5d242 | 591 | return 0; |
de832092 KC |
592 | |
593 | fail: | |
594 | *cnt = 0; | |
f4c5d242 AV |
595 | return err; |
596 | } | |
597 | ||
c443a5f3 KC |
598 | static int ramoops_init_prz(const char *name, |
599 | struct device *dev, struct ramoops_context *cxt, | |
f568f6ca GKH |
600 | struct persistent_ram_zone **prz, |
601 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b | 602 | { |
1227daa4 KC |
603 | char *label; |
604 | ||
b5d38e9b AV |
605 | if (!sz) |
606 | return 0; | |
607 | ||
c6289378 | 608 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
c443a5f3 KC |
609 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
610 | name, sz, (unsigned long long)*paddr, | |
c6289378 | 611 | cxt->size, (unsigned long long)cxt->phys_addr); |
b5d38e9b | 612 | return -ENOMEM; |
c6289378 | 613 | } |
b5d38e9b | 614 | |
1227daa4 | 615 | label = kasprintf(GFP_KERNEL, "ramoops:%s", name); |
663deb47 | 616 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
7684bd33 | 617 | cxt->memtype, PRZ_FLAG_ZAP_OLD, label); |
b5d38e9b AV |
618 | if (IS_ERR(*prz)) { |
619 | int err = PTR_ERR(*prz); | |
620 | ||
c443a5f3 KC |
621 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
622 | name, sz, (unsigned long long)*paddr, err); | |
b5d38e9b AV |
623 | return err; |
624 | } | |
625 | ||
b5d38e9b | 626 | *paddr += sz; |
f0f23e54 | 627 | (*prz)->type = pstore_name_to_type(name); |
b5d38e9b AV |
628 | |
629 | return 0; | |
630 | } | |
631 | ||
35da6094 GH |
632 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
633 | const char *propname, u32 *value) | |
634 | { | |
635 | u32 val32 = 0; | |
636 | int ret; | |
637 | ||
638 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
639 | if (ret < 0 && ret != -EINVAL) { | |
640 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
641 | propname, ret); | |
642 | return ret; | |
643 | } | |
644 | ||
645 | if (val32 > INT_MAX) { | |
646 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
647 | return -EOVERFLOW; | |
648 | } | |
649 | ||
650 | *value = val32; | |
651 | return 0; | |
652 | } | |
653 | ||
654 | static int ramoops_parse_dt(struct platform_device *pdev, | |
655 | struct ramoops_platform_data *pdata) | |
656 | { | |
657 | struct device_node *of_node = pdev->dev.of_node; | |
1614e921 | 658 | struct device_node *parent_node; |
529182e2 | 659 | struct resource *res; |
35da6094 GH |
660 | u32 value; |
661 | int ret; | |
662 | ||
663 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
664 | ||
529182e2 KC |
665 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
666 | if (!res) { | |
35da6094 | 667 | dev_err(&pdev->dev, |
529182e2 KC |
668 | "failed to locate DT /reserved-memory resource\n"); |
669 | return -EINVAL; | |
35da6094 GH |
670 | } |
671 | ||
529182e2 KC |
672 | pdata->mem_size = resource_size(res); |
673 | pdata->mem_address = res->start; | |
35da6094 GH |
674 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
675 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
676 | ||
677 | #define parse_size(name, field) { \ | |
678 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
679 | if (ret < 0) \ | |
680 | return ret; \ | |
681 | field = value; \ | |
682 | } | |
683 | ||
684 | parse_size("record-size", pdata->record_size); | |
685 | parse_size("console-size", pdata->console_size); | |
686 | parse_size("ftrace-size", pdata->ftrace_size); | |
687 | parse_size("pmsg-size", pdata->pmsg_size); | |
688 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
a1cf53ac | 689 | parse_size("flags", pdata->flags); |
35da6094 GH |
690 | |
691 | #undef parse_size | |
692 | ||
1614e921 DA |
693 | /* |
694 | * Some old Chromebooks relied on the kernel setting the | |
695 | * console_size and pmsg_size to the record size since that's | |
696 | * what the downstream kernel did. These same Chromebooks had | |
697 | * "ramoops" straight under the root node which isn't | |
698 | * according to the current upstream bindings (though it was | |
699 | * arguably acceptable under a prior version of the bindings). | |
700 | * Let's make those old Chromebooks work by detecting that | |
701 | * we're not a child of "reserved-memory" and mimicking the | |
702 | * expected behavior. | |
703 | */ | |
704 | parent_node = of_get_parent(of_node); | |
705 | if (!of_node_name_eq(parent_node, "reserved-memory") && | |
706 | !pdata->console_size && !pdata->ftrace_size && | |
707 | !pdata->pmsg_size && !pdata->ecc_info.ecc_size) { | |
708 | pdata->console_size = pdata->record_size; | |
709 | pdata->pmsg_size = pdata->record_size; | |
710 | } | |
711 | of_node_put(parent_node); | |
712 | ||
35da6094 GH |
713 | return 0; |
714 | } | |
715 | ||
f568f6ca | 716 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 717 | { |
896fc1f0 | 718 | struct device *dev = &pdev->dev; |
35da6094 | 719 | struct ramoops_platform_data *pdata = dev->platform_data; |
5631e857 | 720 | struct ramoops_platform_data pdata_local; |
56d611a0 | 721 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
722 | size_t dump_mem_sz; |
723 | phys_addr_t paddr; | |
56d611a0 MS |
724 | int err = -EINVAL; |
725 | ||
fc46d4e4 KC |
726 | /* |
727 | * Only a single ramoops area allowed at a time, so fail extra | |
9ba80d99 KC |
728 | * probes. |
729 | */ | |
fc46d4e4 KC |
730 | if (cxt->max_dump_cnt) { |
731 | pr_err("already initialized\n"); | |
9ba80d99 | 732 | goto fail_out; |
fc46d4e4 KC |
733 | } |
734 | ||
1e0f67a9 YH |
735 | if (dev_of_node(dev) && !pdata) { |
736 | pdata = &pdata_local; | |
737 | memset(pdata, 0, sizeof(*pdata)); | |
738 | ||
739 | err = ramoops_parse_dt(pdev, pdata); | |
740 | if (err < 0) | |
741 | goto fail_out; | |
742 | } | |
743 | ||
fc46d4e4 KC |
744 | /* Make sure we didn't get bogus platform data pointer. */ |
745 | if (!pdata) { | |
746 | pr_err("NULL platform data\n"); | |
747 | goto fail_out; | |
748 | } | |
9ba80d99 | 749 | |
a694d1b5 | 750 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 751 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 752 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 753 | "non-zero\n"); |
9ba80d99 | 754 | goto fail_out; |
56d611a0 MS |
755 | } |
756 | ||
3bd11cf5 | 757 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 758 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 759 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 760 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 761 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 762 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
763 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
764 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 765 | |
13aefd72 MS |
766 | cxt->size = pdata->mem_size; |
767 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 768 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 769 | cxt->record_size = pdata->record_size; |
b5d38e9b | 770 | cxt->console_size = pdata->console_size; |
a694d1b5 | 771 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 772 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 773 | cxt->dump_oops = pdata->dump_oops; |
a1cf53ac | 774 | cxt->flags = pdata->flags; |
c31ad081 | 775 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 776 | |
f4c5d242 | 777 | paddr = cxt->phys_addr; |
896fc1f0 | 778 | |
9d5438f4 MS |
779 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
780 | - cxt->pmsg_size; | |
f0f23e54 | 781 | err = ramoops_init_przs("dmesg", dev, cxt, &cxt->dprzs, &paddr, |
c443a5f3 KC |
782 | dump_mem_sz, cxt->record_size, |
783 | &cxt->max_dump_cnt, 0, 0); | |
b5d38e9b AV |
784 | if (err) |
785 | goto fail_out; | |
786 | ||
c443a5f3 | 787 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
cbe7cbf5 | 788 | cxt->console_size, 0); |
b5d38e9b AV |
789 | if (err) |
790 | goto fail_init_cprz; | |
791 | ||
a1cf53ac JF |
792 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
793 | ? nr_cpu_ids | |
794 | : 1; | |
c443a5f3 KC |
795 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
796 | cxt->ftrace_size, -1, | |
797 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, | |
a1cf53ac JF |
798 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
799 | ? PRZ_FLAG_NO_LOCK : 0); | |
a694d1b5 AV |
800 | if (err) |
801 | goto fail_init_fprz; | |
802 | ||
c443a5f3 KC |
803 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
804 | cxt->pmsg_size, 0); | |
9d5438f4 MS |
805 | if (err) |
806 | goto fail_init_mprz; | |
807 | ||
9ba80d99 | 808 | cxt->pstore.data = cxt; |
b5d38e9b | 809 | /* |
8880fa32 KC |
810 | * Prepare frontend flags based on which areas are initialized. |
811 | * For ramoops_init_przs() cases, the "max count" variable tells | |
812 | * if there are regions present. For ramoops_init_prz() cases, | |
813 | * the single region size is how to check. | |
b5d38e9b | 814 | */ |
8880fa32 KC |
815 | cxt->pstore.flags = 0; |
816 | if (cxt->max_dump_cnt) | |
817 | cxt->pstore.flags |= PSTORE_FLAGS_DMESG; | |
79d955af NK |
818 | if (cxt->console_size) |
819 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
8880fa32 | 820 | if (cxt->max_ftrace_cnt) |
79d955af NK |
821 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; |
822 | if (cxt->pmsg_size) | |
823 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 824 | |
8880fa32 KC |
825 | /* |
826 | * Since bufsize is only used for dmesg crash dumps, it | |
827 | * must match the size of the dprz record (after PRZ header | |
828 | * and ECC bytes have been accounted for). | |
829 | */ | |
830 | if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) { | |
831 | cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size; | |
832 | cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL); | |
833 | if (!cxt->pstore.buf) { | |
834 | pr_err("cannot allocate pstore crash dump buffer\n"); | |
835 | err = -ENOMEM; | |
836 | goto fail_clear; | |
837 | } | |
838 | } | |
839 | ||
9ba80d99 | 840 | err = pstore_register(&cxt->pstore); |
56d611a0 | 841 | if (err) { |
9ba80d99 | 842 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 843 | goto fail_buf; |
56d611a0 MS |
844 | } |
845 | ||
c755201e KC |
846 | /* |
847 | * Update the module parameter variables as well so they are visible | |
848 | * through /sys/module/ramoops/parameters/ | |
849 | */ | |
850 | mem_size = pdata->mem_size; | |
851 | mem_address = pdata->mem_address; | |
852 | record_size = pdata->record_size; | |
853 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
854 | ramoops_console_size = pdata->console_size; |
855 | ramoops_pmsg_size = pdata->pmsg_size; | |
856 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 857 | |
dc80b1ea | 858 | pr_info("using 0x%lx@0x%llx, ecc: %d\n", |
d109a674 | 859 | cxt->size, (unsigned long long)cxt->phys_addr, |
dc80b1ea | 860 | cxt->ecc_info.ecc_size); |
9ba80d99 | 861 | |
56d611a0 MS |
862 | return 0; |
863 | ||
9ba80d99 KC |
864 | fail_buf: |
865 | kfree(cxt->pstore.buf); | |
866 | fail_clear: | |
867 | cxt->pstore.bufsize = 0; | |
e976e564 | 868 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 869 | fail_init_mprz: |
a694d1b5 | 870 | fail_init_fprz: |
e976e564 | 871 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 872 | fail_init_cprz: |
f4c5d242 | 873 | ramoops_free_przs(cxt); |
9ba80d99 | 874 | fail_out: |
56d611a0 MS |
875 | return err; |
876 | } | |
877 | ||
ee1d2674 | 878 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
879 | { |
880 | struct ramoops_context *cxt = &oops_cxt; | |
881 | ||
ee1d2674 | 882 | pstore_unregister(&cxt->pstore); |
9ba80d99 | 883 | |
9ba80d99 KC |
884 | kfree(cxt->pstore.buf); |
885 | cxt->pstore.bufsize = 0; | |
886 | ||
ee1d2674 | 887 | persistent_ram_free(cxt->mprz); |
ee1d2674 GT |
888 | persistent_ram_free(cxt->cprz); |
889 | ramoops_free_przs(cxt); | |
890 | ||
c3b92ce9 | 891 | return 0; |
56d611a0 MS |
892 | } |
893 | ||
35da6094 GH |
894 | static const struct of_device_id dt_match[] = { |
895 | { .compatible = "ramoops" }, | |
896 | {} | |
897 | }; | |
898 | ||
c3b92ce9 | 899 | static struct platform_driver ramoops_driver = { |
924d3711 | 900 | .probe = ramoops_probe, |
ee1d2674 | 901 | .remove = ramoops_remove, |
c3b92ce9 | 902 | .driver = { |
35da6094 GH |
903 | .name = "ramoops", |
904 | .of_match_table = dt_match, | |
c3b92ce9 KP |
905 | }, |
906 | }; | |
907 | ||
bac6f6cd | 908 | static inline void ramoops_unregister_dummy(void) |
c3b92ce9 | 909 | { |
bac6f6cd KC |
910 | platform_device_unregister(dummy); |
911 | dummy = NULL; | |
bac6f6cd KC |
912 | } |
913 | ||
914 | static void __init ramoops_register_dummy(void) | |
915 | { | |
182ca6e0 YH |
916 | struct ramoops_platform_data pdata; |
917 | ||
bac6f6cd KC |
918 | /* |
919 | * Prepare a dummy platform data structure to carry the module | |
920 | * parameters. If mem_size isn't set, then there are no module | |
921 | * parameters, and we can skip this. | |
922 | */ | |
924d3711 AV |
923 | if (!mem_size) |
924 | return; | |
925 | ||
926 | pr_info("using module parameters\n"); | |
927 | ||
182ca6e0 YH |
928 | memset(&pdata, 0, sizeof(pdata)); |
929 | pdata.mem_size = mem_size; | |
930 | pdata.mem_address = mem_address; | |
931 | pdata.mem_type = mem_type; | |
932 | pdata.record_size = record_size; | |
933 | pdata.console_size = ramoops_console_size; | |
934 | pdata.ftrace_size = ramoops_ftrace_size; | |
935 | pdata.pmsg_size = ramoops_pmsg_size; | |
936 | pdata.dump_oops = dump_oops; | |
937 | pdata.flags = RAMOOPS_FLAG_FTRACE_PER_CPU; | |
a1cf53ac | 938 | |
5ca5d4e6 AV |
939 | /* |
940 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
941 | * (using 1 byte for ECC isn't much of use anyway). | |
942 | */ | |
182ca6e0 | 943 | pdata.ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
944 | |
945 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
182ca6e0 | 946 | &pdata, sizeof(pdata)); |
924d3711 AV |
947 | if (IS_ERR(dummy)) { |
948 | pr_info("could not create platform device: %ld\n", | |
949 | PTR_ERR(dummy)); | |
bac6f6cd KC |
950 | dummy = NULL; |
951 | ramoops_unregister_dummy(); | |
924d3711 AV |
952 | } |
953 | } | |
954 | ||
955 | static int __init ramoops_init(void) | |
956 | { | |
bac6f6cd KC |
957 | int ret; |
958 | ||
924d3711 | 959 | ramoops_register_dummy(); |
bac6f6cd KC |
960 | ret = platform_driver_register(&ramoops_driver); |
961 | if (ret != 0) | |
962 | ramoops_unregister_dummy(); | |
963 | ||
964 | return ret; | |
c3b92ce9 | 965 | } |
41603165 | 966 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
967 | |
968 | static void __exit ramoops_exit(void) | |
969 | { | |
970 | platform_driver_unregister(&ramoops_driver); | |
bac6f6cd | 971 | ramoops_unregister_dummy(); |
c3b92ce9 | 972 | } |
56d611a0 MS |
973 | module_exit(ramoops_exit); |
974 | ||
975 | MODULE_LICENSE("GPL"); | |
976 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
977 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |