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Commit | Line | Data |
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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/time.h> |
31 | #include <linux/io.h> | |
32 | #include <linux/ioport.h> | |
c3b92ce9 | 33 | #include <linux/platform_device.h> |
13aefd72 | 34 | #include <linux/slab.h> |
24203036 | 35 | #include <linux/compiler.h> |
1894a253 | 36 | #include <linux/pstore_ram.h> |
35da6094 GH |
37 | #include <linux/of.h> |
38 | #include <linux/of_address.h> | |
56d611a0 MS |
39 | |
40 | #define RAMOOPS_KERNMSG_HDR "====" | |
3e5c4fad | 41 | #define MIN_MEM_SIZE 4096UL |
56d611a0 | 42 | |
3e5c4fad SI |
43 | static ulong record_size = MIN_MEM_SIZE; |
44 | module_param(record_size, ulong, 0400); | |
45 | MODULE_PARM_DESC(record_size, | |
46 | "size of each dump done on oops/panic"); | |
56d611a0 | 47 | |
b5d38e9b AV |
48 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
49 | module_param_named(console_size, ramoops_console_size, ulong, 0400); | |
50 | MODULE_PARM_DESC(console_size, "size of kernel console log"); | |
51 | ||
a694d1b5 AV |
52 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
53 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); | |
54 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); | |
55 | ||
9d5438f4 MS |
56 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
57 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); | |
58 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); | |
59 | ||
764fd639 WWNDU |
60 | static unsigned long long mem_address; |
61 | module_param(mem_address, ullong, 0400); | |
56d611a0 MS |
62 | MODULE_PARM_DESC(mem_address, |
63 | "start of reserved RAM used to store oops/panic logs"); | |
64 | ||
65 | static ulong mem_size; | |
66 | module_param(mem_size, ulong, 0400); | |
67 | MODULE_PARM_DESC(mem_size, | |
68 | "size of reserved RAM used to store oops/panic logs"); | |
69 | ||
027bc8b0 TL |
70 | static unsigned int mem_type; |
71 | module_param(mem_type, uint, 0600); | |
72 | MODULE_PARM_DESC(mem_type, | |
73 | "set to 1 to try to use unbuffered memory (default 0)"); | |
74 | ||
56d611a0 MS |
75 | static int dump_oops = 1; |
76 | module_param(dump_oops, int, 0600); | |
77 | MODULE_PARM_DESC(dump_oops, | |
78 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
79 | ||
39eb7e97 AV |
80 | static int ramoops_ecc; |
81 | module_param_named(ecc, ramoops_ecc, int, 0600); | |
82 | MODULE_PARM_DESC(ramoops_ecc, | |
5ca5d4e6 AV |
83 | "if non-zero, the option enables ECC support and specifies " |
84 | "ECC buffer size in bytes (1 is a special value, means 16 " | |
85 | "bytes ECC)"); | |
39eb7e97 | 86 | |
9ba80d99 | 87 | struct ramoops_context { |
896fc1f0 | 88 | struct persistent_ram_zone **przs; |
b5d38e9b | 89 | struct persistent_ram_zone *cprz; |
a694d1b5 | 90 | struct persistent_ram_zone *fprz; |
9d5438f4 | 91 | struct persistent_ram_zone *mprz; |
56d611a0 MS |
92 | phys_addr_t phys_addr; |
93 | unsigned long size; | |
027bc8b0 | 94 | unsigned int memtype; |
9ba80d99 | 95 | size_t record_size; |
b5d38e9b | 96 | size_t console_size; |
a694d1b5 | 97 | size_t ftrace_size; |
9d5438f4 | 98 | size_t pmsg_size; |
6b4d2a27 | 99 | int dump_oops; |
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; |
a694d1b5 | 106 | unsigned int ftrace_read_cnt; |
9d5438f4 | 107 | unsigned int pmsg_read_cnt; |
9ba80d99 KC |
108 | struct pstore_info pstore; |
109 | }; | |
56d611a0 | 110 | |
13aefd72 MS |
111 | static struct platform_device *dummy; |
112 | static struct ramoops_platform_data *dummy_data; | |
113 | ||
9ba80d99 KC |
114 | static int ramoops_pstore_open(struct pstore_info *psi) |
115 | { | |
116 | struct ramoops_context *cxt = psi->data; | |
117 | ||
cac2eb7b | 118 | cxt->dump_read_cnt = 0; |
b5d38e9b | 119 | cxt->console_read_cnt = 0; |
57fd8353 | 120 | cxt->ftrace_read_cnt = 0; |
9d5438f4 | 121 | cxt->pmsg_read_cnt = 0; |
9ba80d99 KC |
122 | return 0; |
123 | } | |
124 | ||
755d66b4 AV |
125 | static struct persistent_ram_zone * |
126 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, | |
127 | u64 *id, | |
128 | enum pstore_type_id *typep, enum pstore_type_id type, | |
129 | bool update) | |
130 | { | |
131 | struct persistent_ram_zone *prz; | |
132 | int i = (*c)++; | |
133 | ||
134 | if (i >= max) | |
135 | return NULL; | |
136 | ||
137 | prz = przs[i]; | |
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 AV |
147 | |
148 | *typep = type; | |
149 | *id = i; | |
150 | ||
151 | return prz; | |
152 | } | |
153 | ||
a28726b4 | 154 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
3f8f80f0 AB |
155 | bool *compressed) |
156 | { | |
157 | char data_type; | |
a28726b4 | 158 | int header_length = 0; |
3f8f80f0 | 159 | |
a28726b4 BZ |
160 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
161 | &time->tv_nsec, &data_type, &header_length) == 3) { | |
3f8f80f0 AB |
162 | if (data_type == 'C') |
163 | *compressed = true; | |
164 | else | |
165 | *compressed = false; | |
a28726b4 BZ |
166 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
167 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { | |
3f8f80f0 AB |
168 | *compressed = false; |
169 | } else { | |
170 | time->tv_sec = 0; | |
171 | time->tv_nsec = 0; | |
172 | *compressed = false; | |
173 | } | |
a28726b4 | 174 | return header_length; |
3f8f80f0 AB |
175 | } |
176 | ||
f44f9652 MS |
177 | static bool prz_ok(struct persistent_ram_zone *prz) |
178 | { | |
179 | return !!prz && !!(persistent_ram_old_size(prz) + | |
180 | persistent_ram_ecc_string(prz, NULL, 0)); | |
181 | } | |
182 | ||
9ba80d99 | 183 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
755d4fe4 | 184 | int *count, struct timespec *time, |
9a4e1398 | 185 | char **buf, bool *compressed, |
8cfc8ddc | 186 | ssize_t *ecc_notice_size, |
9a4e1398 | 187 | struct pstore_info *psi) |
56d611a0 | 188 | { |
9ba80d99 | 189 | ssize_t size; |
9ba80d99 | 190 | struct ramoops_context *cxt = psi->data; |
e036bd33 BZ |
191 | struct persistent_ram_zone *prz = NULL; |
192 | int header_length = 0; | |
193 | ||
194 | /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but | |
195 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have | |
196 | * valid time stamps, so it is initialized to zero. | |
197 | */ | |
198 | time->tv_sec = 0; | |
199 | time->tv_nsec = 0; | |
200 | *compressed = false; | |
201 | ||
202 | /* Find the next valid persistent_ram_zone for DMESG */ | |
203 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { | |
204 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, | |
205 | cxt->max_dump_cnt, id, type, | |
206 | PSTORE_TYPE_DMESG, 1); | |
207 | if (!prz_ok(prz)) | |
208 | continue; | |
209 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), | |
210 | time, compressed); | |
211 | /* Clear and skip this DMESG record if it has no valid header */ | |
212 | if (!header_length) { | |
213 | persistent_ram_free_old(prz); | |
214 | persistent_ram_zap(prz); | |
215 | prz = NULL; | |
216 | } | |
217 | } | |
9ba80d99 | 218 | |
f44f9652 | 219 | if (!prz_ok(prz)) |
b5d38e9b AV |
220 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, |
221 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); | |
f44f9652 | 222 | if (!prz_ok(prz)) |
a694d1b5 AV |
223 | prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, |
224 | 1, id, type, PSTORE_TYPE_FTRACE, 0); | |
9d5438f4 MS |
225 | if (!prz_ok(prz)) |
226 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, | |
227 | 1, id, type, PSTORE_TYPE_PMSG, 0); | |
f44f9652 | 228 | if (!prz_ok(prz)) |
755d66b4 | 229 | return 0; |
896fc1f0 | 230 | |
e036bd33 | 231 | size = persistent_ram_old_size(prz) - header_length; |
bd08ec33 AH |
232 | |
233 | /* ECC correction notice */ | |
8cfc8ddc | 234 | *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
bd08ec33 | 235 | |
8cfc8ddc | 236 | *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL); |
9ba80d99 KC |
237 | if (*buf == NULL) |
238 | return -ENOMEM; | |
9ba80d99 | 239 | |
a28726b4 | 240 | memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); |
8cfc8ddc | 241 | persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1); |
bd08ec33 | 242 | |
8cfc8ddc | 243 | return size; |
9ba80d99 KC |
244 | } |
245 | ||
3f8f80f0 AB |
246 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
247 | bool compressed) | |
896fc1f0 AV |
248 | { |
249 | char *hdr; | |
1e817fb6 | 250 | struct timespec timestamp; |
896fc1f0 AV |
251 | size_t len; |
252 | ||
1e817fb6 KC |
253 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
254 | if (__getnstimeofday(×tamp)) { | |
255 | timestamp.tv_sec = 0; | |
256 | timestamp.tv_nsec = 0; | |
257 | } | |
3f8f80f0 AB |
258 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
259 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), | |
260 | compressed ? 'C' : 'D'); | |
896fc1f0 AV |
261 | WARN_ON_ONCE(!hdr); |
262 | len = hdr ? strlen(hdr) : 0; | |
263 | persistent_ram_write(prz, hdr, len); | |
264 | kfree(hdr); | |
265 | ||
266 | return len; | |
267 | } | |
268 | ||
24203036 AV |
269 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
270 | enum kmsg_dump_reason reason, | |
271 | u64 *id, unsigned int part, | |
6bbbca73 | 272 | const char *buf, |
b3b515bb | 273 | bool compressed, size_t size, |
24203036 | 274 | struct pstore_info *psi) |
9ba80d99 | 275 | { |
9ba80d99 | 276 | struct ramoops_context *cxt = psi->data; |
c6289378 | 277 | struct persistent_ram_zone *prz; |
896fc1f0 | 278 | size_t hlen; |
9ba80d99 | 279 | |
b5d38e9b AV |
280 | if (type == PSTORE_TYPE_CONSOLE) { |
281 | if (!cxt->cprz) | |
282 | return -ENOMEM; | |
c2b71132 | 283 | persistent_ram_write(cxt->cprz, buf, size); |
b5d38e9b | 284 | return 0; |
a694d1b5 AV |
285 | } else if (type == PSTORE_TYPE_FTRACE) { |
286 | if (!cxt->fprz) | |
287 | return -ENOMEM; | |
288 | persistent_ram_write(cxt->fprz, buf, size); | |
289 | return 0; | |
9d5438f4 MS |
290 | } else if (type == PSTORE_TYPE_PMSG) { |
291 | if (!cxt->mprz) | |
292 | return -ENOMEM; | |
293 | persistent_ram_write(cxt->mprz, buf, size); | |
294 | return 0; | |
b5d38e9b AV |
295 | } |
296 | ||
9ba80d99 KC |
297 | if (type != PSTORE_TYPE_DMESG) |
298 | return -EINVAL; | |
56d611a0 | 299 | |
9ba80d99 KC |
300 | /* Out of the various dmesg dump types, ramoops is currently designed |
301 | * to only store crash logs, rather than storing general kernel logs. | |
302 | */ | |
fc2d557c | 303 | if (reason != KMSG_DUMP_OOPS && |
a3dd3323 | 304 | reason != KMSG_DUMP_PANIC) |
9ba80d99 | 305 | return -EINVAL; |
fc2d557c | 306 | |
9ba80d99 | 307 | /* Skip Oopes when configured to do so. */ |
6b4d2a27 | 308 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
9ba80d99 KC |
309 | return -EINVAL; |
310 | ||
311 | /* Explicitly only take the first part of any new crash. | |
312 | * If our buffer is larger than kmsg_bytes, this can never happen, | |
313 | * and if our buffer is smaller than kmsg_bytes, we don't want the | |
314 | * report split across multiple records. | |
315 | */ | |
316 | if (part != 1) | |
317 | return -ENOSPC; | |
56d611a0 | 318 | |
c6289378 AH |
319 | if (!cxt->przs) |
320 | return -ENOSPC; | |
321 | ||
322 | prz = cxt->przs[cxt->dump_write_cnt]; | |
323 | ||
3f8f80f0 | 324 | hlen = ramoops_write_kmsg_hdr(prz, compressed); |
896fc1f0 AV |
325 | if (size + hlen > prz->buffer_size) |
326 | size = prz->buffer_size - hlen; | |
c2b71132 | 327 | persistent_ram_write(prz, buf, size); |
56d611a0 | 328 | |
cac2eb7b | 329 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
9ba80d99 KC |
330 | |
331 | return 0; | |
332 | } | |
333 | ||
5bf6d1b9 MS |
334 | static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type, |
335 | enum kmsg_dump_reason reason, | |
336 | u64 *id, unsigned int part, | |
337 | const char __user *buf, | |
338 | bool compressed, size_t size, | |
339 | struct pstore_info *psi) | |
340 | { | |
341 | if (type == PSTORE_TYPE_PMSG) { | |
342 | struct ramoops_context *cxt = psi->data; | |
343 | ||
344 | if (!cxt->mprz) | |
345 | return -ENOMEM; | |
346 | return persistent_ram_write_user(cxt->mprz, buf, size); | |
347 | } | |
348 | ||
349 | return -EINVAL; | |
350 | } | |
351 | ||
755d4fe4 | 352 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 353 | struct timespec time, struct pstore_info *psi) |
9ba80d99 | 354 | { |
9ba80d99 | 355 | struct ramoops_context *cxt = psi->data; |
b5d38e9b | 356 | struct persistent_ram_zone *prz; |
9ba80d99 | 357 | |
b5d38e9b AV |
358 | switch (type) { |
359 | case PSTORE_TYPE_DMESG: | |
360 | if (id >= cxt->max_dump_cnt) | |
361 | return -EINVAL; | |
362 | prz = cxt->przs[id]; | |
363 | break; | |
364 | case PSTORE_TYPE_CONSOLE: | |
365 | prz = cxt->cprz; | |
366 | break; | |
a694d1b5 AV |
367 | case PSTORE_TYPE_FTRACE: |
368 | prz = cxt->fprz; | |
369 | break; | |
9d5438f4 MS |
370 | case PSTORE_TYPE_PMSG: |
371 | prz = cxt->mprz; | |
372 | break; | |
b5d38e9b | 373 | default: |
9ba80d99 | 374 | return -EINVAL; |
b5d38e9b | 375 | } |
9ba80d99 | 376 | |
b5d38e9b AV |
377 | persistent_ram_free_old(prz); |
378 | persistent_ram_zap(prz); | |
9ba80d99 KC |
379 | |
380 | return 0; | |
56d611a0 MS |
381 | } |
382 | ||
9ba80d99 KC |
383 | static struct ramoops_context oops_cxt = { |
384 | .pstore = { | |
385 | .owner = THIS_MODULE, | |
386 | .name = "ramoops", | |
387 | .open = ramoops_pstore_open, | |
388 | .read = ramoops_pstore_read, | |
c2b71132 | 389 | .write_buf = ramoops_pstore_write_buf, |
5bf6d1b9 | 390 | .write_buf_user = ramoops_pstore_write_buf_user, |
9ba80d99 KC |
391 | .erase = ramoops_pstore_erase, |
392 | }, | |
393 | }; | |
394 | ||
f4c5d242 AV |
395 | static void ramoops_free_przs(struct ramoops_context *cxt) |
396 | { | |
397 | int i; | |
398 | ||
399 | if (!cxt->przs) | |
400 | return; | |
401 | ||
4407de74 | 402 | for (i = 0; i < cxt->max_dump_cnt; i++) |
f4c5d242 | 403 | persistent_ram_free(cxt->przs[i]); |
4407de74 | 404 | |
f4c5d242 | 405 | kfree(cxt->przs); |
4407de74 | 406 | cxt->max_dump_cnt = 0; |
f4c5d242 AV |
407 | } |
408 | ||
f568f6ca GKH |
409 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, |
410 | phys_addr_t *paddr, size_t dump_mem_sz) | |
f4c5d242 AV |
411 | { |
412 | int err = -ENOMEM; | |
413 | int i; | |
414 | ||
415 | if (!cxt->record_size) | |
416 | return 0; | |
417 | ||
c6289378 AH |
418 | if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { |
419 | dev_err(dev, "no room for dumps\n"); | |
420 | return -ENOMEM; | |
421 | } | |
422 | ||
f4c5d242 AV |
423 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; |
424 | if (!cxt->max_dump_cnt) | |
425 | return -ENOMEM; | |
426 | ||
427 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, | |
428 | GFP_KERNEL); | |
429 | if (!cxt->przs) { | |
430 | dev_err(dev, "failed to initialize a prz array for dumps\n"); | |
4407de74 | 431 | goto fail_mem; |
f4c5d242 AV |
432 | } |
433 | ||
434 | for (i = 0; i < cxt->max_dump_cnt; i++) { | |
07239fc8 | 435 | cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0, |
027bc8b0 TL |
436 | &cxt->ecc_info, |
437 | cxt->memtype); | |
f4c5d242 AV |
438 | if (IS_ERR(cxt->przs[i])) { |
439 | err = PTR_ERR(cxt->przs[i]); | |
440 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
07239fc8 | 441 | cxt->record_size, (unsigned long long)*paddr, err); |
4407de74 SAS |
442 | |
443 | while (i > 0) { | |
444 | i--; | |
445 | persistent_ram_free(cxt->przs[i]); | |
446 | } | |
f4c5d242 AV |
447 | goto fail_prz; |
448 | } | |
07239fc8 | 449 | *paddr += cxt->record_size; |
f4c5d242 AV |
450 | } |
451 | ||
452 | return 0; | |
453 | fail_prz: | |
4407de74 SAS |
454 | kfree(cxt->przs); |
455 | fail_mem: | |
456 | cxt->max_dump_cnt = 0; | |
f4c5d242 AV |
457 | return err; |
458 | } | |
459 | ||
f568f6ca GKH |
460 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
461 | struct persistent_ram_zone **prz, | |
462 | phys_addr_t *paddr, size_t sz, u32 sig) | |
b5d38e9b AV |
463 | { |
464 | if (!sz) | |
465 | return 0; | |
466 | ||
c6289378 AH |
467 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
468 | dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", | |
469 | sz, (unsigned long long)*paddr, | |
470 | cxt->size, (unsigned long long)cxt->phys_addr); | |
b5d38e9b | 471 | return -ENOMEM; |
c6289378 | 472 | } |
b5d38e9b | 473 | |
027bc8b0 | 474 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype); |
b5d38e9b AV |
475 | if (IS_ERR(*prz)) { |
476 | int err = PTR_ERR(*prz); | |
477 | ||
478 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", | |
479 | sz, (unsigned long long)*paddr, err); | |
480 | return err; | |
481 | } | |
482 | ||
483 | persistent_ram_zap(*prz); | |
484 | ||
485 | *paddr += sz; | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
35da6094 GH |
490 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
491 | const char *propname, u32 *value) | |
492 | { | |
493 | u32 val32 = 0; | |
494 | int ret; | |
495 | ||
496 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); | |
497 | if (ret < 0 && ret != -EINVAL) { | |
498 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", | |
499 | propname, ret); | |
500 | return ret; | |
501 | } | |
502 | ||
503 | if (val32 > INT_MAX) { | |
504 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); | |
505 | return -EOVERFLOW; | |
506 | } | |
507 | ||
508 | *value = val32; | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static int ramoops_parse_dt(struct platform_device *pdev, | |
513 | struct ramoops_platform_data *pdata) | |
514 | { | |
515 | struct device_node *of_node = pdev->dev.of_node; | |
529182e2 | 516 | struct resource *res; |
35da6094 GH |
517 | u32 value; |
518 | int ret; | |
519 | ||
520 | dev_dbg(&pdev->dev, "using Device Tree\n"); | |
521 | ||
529182e2 KC |
522 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
523 | if (!res) { | |
35da6094 | 524 | dev_err(&pdev->dev, |
529182e2 KC |
525 | "failed to locate DT /reserved-memory resource\n"); |
526 | return -EINVAL; | |
35da6094 GH |
527 | } |
528 | ||
529182e2 KC |
529 | pdata->mem_size = resource_size(res); |
530 | pdata->mem_address = res->start; | |
35da6094 GH |
531 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
532 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); | |
533 | ||
534 | #define parse_size(name, field) { \ | |
535 | ret = ramoops_parse_dt_size(pdev, name, &value); \ | |
536 | if (ret < 0) \ | |
537 | return ret; \ | |
538 | field = value; \ | |
539 | } | |
540 | ||
541 | parse_size("record-size", pdata->record_size); | |
542 | parse_size("console-size", pdata->console_size); | |
543 | parse_size("ftrace-size", pdata->ftrace_size); | |
544 | parse_size("pmsg-size", pdata->pmsg_size); | |
545 | parse_size("ecc-size", pdata->ecc_info.ecc_size); | |
546 | ||
547 | #undef parse_size | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
f568f6ca | 552 | static int ramoops_probe(struct platform_device *pdev) |
56d611a0 | 553 | { |
896fc1f0 | 554 | struct device *dev = &pdev->dev; |
35da6094 | 555 | struct ramoops_platform_data *pdata = dev->platform_data; |
56d611a0 | 556 | struct ramoops_context *cxt = &oops_cxt; |
f4c5d242 AV |
557 | size_t dump_mem_sz; |
558 | phys_addr_t paddr; | |
56d611a0 MS |
559 | int err = -EINVAL; |
560 | ||
35da6094 GH |
561 | if (dev_of_node(dev) && !pdata) { |
562 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
563 | if (!pdata) { | |
564 | err = -ENOMEM; | |
565 | goto fail_out; | |
566 | } | |
567 | ||
568 | err = ramoops_parse_dt(pdev, pdata); | |
569 | if (err < 0) | |
570 | goto fail_out; | |
571 | } | |
572 | ||
9ba80d99 KC |
573 | /* Only a single ramoops area allowed at a time, so fail extra |
574 | * probes. | |
575 | */ | |
cac2eb7b | 576 | if (cxt->max_dump_cnt) |
9ba80d99 KC |
577 | goto fail_out; |
578 | ||
a694d1b5 | 579 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
9d5438f4 | 580 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
b5d38e9b | 581 | pr_err("The memory size and the record/console size must be " |
3e5c4fad | 582 | "non-zero\n"); |
9ba80d99 | 583 | goto fail_out; |
56d611a0 MS |
584 | } |
585 | ||
3bd11cf5 | 586 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
b042e474 | 587 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
3bd11cf5 | 588 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
b042e474 | 589 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
3bd11cf5 | 590 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
b042e474 | 591 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
9d5438f4 MS |
592 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
593 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); | |
56d611a0 | 594 | |
13aefd72 MS |
595 | cxt->size = pdata->mem_size; |
596 | cxt->phys_addr = pdata->mem_address; | |
027bc8b0 | 597 | cxt->memtype = pdata->mem_type; |
3e5c4fad | 598 | cxt->record_size = pdata->record_size; |
b5d38e9b | 599 | cxt->console_size = pdata->console_size; |
a694d1b5 | 600 | cxt->ftrace_size = pdata->ftrace_size; |
9d5438f4 | 601 | cxt->pmsg_size = pdata->pmsg_size; |
6b4d2a27 | 602 | cxt->dump_oops = pdata->dump_oops; |
c31ad081 | 603 | cxt->ecc_info = pdata->ecc_info; |
56d611a0 | 604 | |
f4c5d242 | 605 | paddr = cxt->phys_addr; |
896fc1f0 | 606 | |
9d5438f4 MS |
607 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
608 | - cxt->pmsg_size; | |
f4c5d242 | 609 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
b5d38e9b AV |
610 | if (err) |
611 | goto fail_out; | |
612 | ||
cbe7cbf5 AV |
613 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
614 | cxt->console_size, 0); | |
b5d38e9b AV |
615 | if (err) |
616 | goto fail_init_cprz; | |
617 | ||
cbe7cbf5 AV |
618 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
619 | LINUX_VERSION_CODE); | |
a694d1b5 AV |
620 | if (err) |
621 | goto fail_init_fprz; | |
622 | ||
9d5438f4 MS |
623 | err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0); |
624 | if (err) | |
625 | goto fail_init_mprz; | |
626 | ||
9ba80d99 | 627 | cxt->pstore.data = cxt; |
b5d38e9b | 628 | /* |
a384f641 AV |
629 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
630 | * have to handle dumps, we must have at least record_size buffer. And | |
631 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be | |
632 | * ZERO_SIZE_PTR). | |
b5d38e9b | 633 | */ |
a384f641 AV |
634 | if (cxt->console_size) |
635 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ | |
636 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); | |
9ba80d99 | 637 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
9ba80d99 KC |
638 | if (!cxt->pstore.buf) { |
639 | pr_err("cannot allocate pstore buffer\n"); | |
47110b88 | 640 | err = -ENOMEM; |
9ba80d99 KC |
641 | goto fail_clear; |
642 | } | |
f88baf68 | 643 | spin_lock_init(&cxt->pstore.buf_lock); |
9ba80d99 | 644 | |
79d955af NK |
645 | cxt->pstore.flags = PSTORE_FLAGS_DMESG; |
646 | if (cxt->console_size) | |
647 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; | |
648 | if (cxt->ftrace_size) | |
649 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; | |
650 | if (cxt->pmsg_size) | |
651 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; | |
c950fd6f | 652 | |
9ba80d99 | 653 | err = pstore_register(&cxt->pstore); |
56d611a0 | 654 | if (err) { |
9ba80d99 | 655 | pr_err("registering with pstore failed\n"); |
896fc1f0 | 656 | goto fail_buf; |
56d611a0 MS |
657 | } |
658 | ||
c755201e KC |
659 | /* |
660 | * Update the module parameter variables as well so they are visible | |
661 | * through /sys/module/ramoops/parameters/ | |
662 | */ | |
663 | mem_size = pdata->mem_size; | |
664 | mem_address = pdata->mem_address; | |
665 | record_size = pdata->record_size; | |
666 | dump_oops = pdata->dump_oops; | |
62f269ef WL |
667 | ramoops_console_size = pdata->console_size; |
668 | ramoops_pmsg_size = pdata->pmsg_size; | |
669 | ramoops_ftrace_size = pdata->ftrace_size; | |
c755201e | 670 | |
c31ad081 | 671 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
d109a674 | 672 | cxt->size, (unsigned long long)cxt->phys_addr, |
c31ad081 | 673 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
9ba80d99 | 674 | |
56d611a0 MS |
675 | return 0; |
676 | ||
9ba80d99 KC |
677 | fail_buf: |
678 | kfree(cxt->pstore.buf); | |
679 | fail_clear: | |
680 | cxt->pstore.bufsize = 0; | |
e976e564 | 681 | persistent_ram_free(cxt->mprz); |
9d5438f4 | 682 | fail_init_mprz: |
e976e564 | 683 | persistent_ram_free(cxt->fprz); |
a694d1b5 | 684 | fail_init_fprz: |
e976e564 | 685 | persistent_ram_free(cxt->cprz); |
b5d38e9b | 686 | fail_init_cprz: |
f4c5d242 | 687 | ramoops_free_przs(cxt); |
9ba80d99 | 688 | fail_out: |
56d611a0 MS |
689 | return err; |
690 | } | |
691 | ||
ee1d2674 | 692 | static int ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
693 | { |
694 | struct ramoops_context *cxt = &oops_cxt; | |
695 | ||
ee1d2674 | 696 | pstore_unregister(&cxt->pstore); |
9ba80d99 | 697 | |
9ba80d99 KC |
698 | kfree(cxt->pstore.buf); |
699 | cxt->pstore.bufsize = 0; | |
700 | ||
ee1d2674 GT |
701 | persistent_ram_free(cxt->mprz); |
702 | persistent_ram_free(cxt->fprz); | |
703 | persistent_ram_free(cxt->cprz); | |
704 | ramoops_free_przs(cxt); | |
705 | ||
c3b92ce9 | 706 | return 0; |
56d611a0 MS |
707 | } |
708 | ||
35da6094 GH |
709 | static const struct of_device_id dt_match[] = { |
710 | { .compatible = "ramoops" }, | |
711 | {} | |
712 | }; | |
713 | ||
c3b92ce9 | 714 | static struct platform_driver ramoops_driver = { |
924d3711 | 715 | .probe = ramoops_probe, |
ee1d2674 | 716 | .remove = ramoops_remove, |
c3b92ce9 | 717 | .driver = { |
35da6094 GH |
718 | .name = "ramoops", |
719 | .of_match_table = dt_match, | |
c3b92ce9 KP |
720 | }, |
721 | }; | |
722 | ||
924d3711 | 723 | static void ramoops_register_dummy(void) |
c3b92ce9 | 724 | { |
924d3711 AV |
725 | if (!mem_size) |
726 | return; | |
727 | ||
728 | pr_info("using module parameters\n"); | |
729 | ||
730 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); | |
731 | if (!dummy_data) { | |
732 | pr_info("could not allocate pdata\n"); | |
733 | return; | |
13aefd72 MS |
734 | } |
735 | ||
924d3711 AV |
736 | dummy_data->mem_size = mem_size; |
737 | dummy_data->mem_address = mem_address; | |
07855056 | 738 | dummy_data->mem_type = mem_type; |
924d3711 AV |
739 | dummy_data->record_size = record_size; |
740 | dummy_data->console_size = ramoops_console_size; | |
a694d1b5 | 741 | dummy_data->ftrace_size = ramoops_ftrace_size; |
9d5438f4 | 742 | dummy_data->pmsg_size = ramoops_pmsg_size; |
924d3711 | 743 | dummy_data->dump_oops = dump_oops; |
5ca5d4e6 AV |
744 | /* |
745 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC | |
746 | * (using 1 byte for ECC isn't much of use anyway). | |
747 | */ | |
c31ad081 | 748 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
924d3711 AV |
749 | |
750 | dummy = platform_device_register_data(NULL, "ramoops", -1, | |
751 | dummy_data, sizeof(struct ramoops_platform_data)); | |
752 | if (IS_ERR(dummy)) { | |
753 | pr_info("could not create platform device: %ld\n", | |
754 | PTR_ERR(dummy)); | |
755 | } | |
756 | } | |
757 | ||
758 | static int __init ramoops_init(void) | |
759 | { | |
760 | ramoops_register_dummy(); | |
761 | return platform_driver_register(&ramoops_driver); | |
c3b92ce9 | 762 | } |
924d3711 | 763 | postcore_initcall(ramoops_init); |
c3b92ce9 KP |
764 | |
765 | static void __exit ramoops_exit(void) | |
766 | { | |
767 | platform_driver_unregister(&ramoops_driver); | |
b4a871bc | 768 | platform_device_unregister(dummy); |
13aefd72 | 769 | kfree(dummy_data); |
c3b92ce9 | 770 | } |
56d611a0 MS |
771 | module_exit(ramoops_exit); |
772 | ||
773 | MODULE_LICENSE("GPL"); | |
774 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
775 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |