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1da177e4 LT |
1 | /* |
2 | * c 2001 PPC 64 Team, IBM Corp | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * /dev/nvram driver for PPC64 | |
10 | * | |
11 | * This perhaps should live in drivers/char | |
12 | * | |
13 | * TODO: Split the /dev/nvram part (that one can use | |
14 | * drivers/char/generic_nvram.c) from the arch & partition | |
15 | * parsing code. | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/types.h> |
19 | #include <linux/errno.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/miscdevice.h> | |
22 | #include <linux/fcntl.h> | |
23 | #include <linux/nvram.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/spinlock.h> | |
78989f0a | 27 | #include <linux/kmsg_dump.h> |
b808b1d6 | 28 | #include <linux/pagemap.h> |
78989f0a HB |
29 | #include <linux/pstore.h> |
30 | #include <linux/zlib.h> | |
1da177e4 LT |
31 | #include <asm/uaccess.h> |
32 | #include <asm/nvram.h> | |
33 | #include <asm/rtas.h> | |
34 | #include <asm/prom.h> | |
35 | #include <asm/machdep.h> | |
1da177e4 LT |
36 | |
37 | #undef DEBUG_NVRAM | |
38 | ||
36673307 BH |
39 | #define NVRAM_HEADER_LEN sizeof(struct nvram_header) |
40 | #define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN | |
74d51d02 BH |
41 | |
42 | /* If change this size, then change the size of NVNAME_LEN */ | |
43 | struct nvram_header { | |
44 | unsigned char signature; | |
45 | unsigned char checksum; | |
46 | unsigned short length; | |
6024ede9 | 47 | /* Terminating null required only for names < 12 chars. */ |
74d51d02 BH |
48 | char name[12]; |
49 | }; | |
50 | ||
51 | struct nvram_partition { | |
52 | struct list_head partition; | |
53 | struct nvram_header header; | |
54 | unsigned int index; | |
55 | }; | |
56 | ||
690d1a9b | 57 | static LIST_HEAD(nvram_partitions); |
1da177e4 | 58 | |
78989f0a HB |
59 | #ifdef CONFIG_PPC_PSERIES |
60 | struct nvram_os_partition rtas_log_partition = { | |
61 | .name = "ibm,rtas-log", | |
62 | .req_size = 2079, | |
63 | .min_size = 1055, | |
64 | .index = -1, | |
65 | .os_partition = true | |
66 | }; | |
67 | #endif | |
68 | ||
69 | struct nvram_os_partition oops_log_partition = { | |
70 | .name = "lnx,oops-log", | |
71 | .req_size = 4000, | |
72 | .min_size = 2000, | |
73 | .index = -1, | |
74 | .os_partition = true | |
75 | }; | |
76 | ||
77 | static const char *nvram_os_partitions[] = { | |
78 | #ifdef CONFIG_PPC_PSERIES | |
79 | "ibm,rtas-log", | |
80 | #endif | |
81 | "lnx,oops-log", | |
82 | NULL | |
83 | }; | |
84 | ||
85 | static void oops_to_nvram(struct kmsg_dumper *dumper, | |
86 | enum kmsg_dump_reason reason); | |
87 | ||
88 | static struct kmsg_dumper nvram_kmsg_dumper = { | |
89 | .dump = oops_to_nvram | |
90 | }; | |
91 | ||
92 | /* | |
93 | * For capturing and compressing an oops or panic report... | |
94 | ||
95 | * big_oops_buf[] holds the uncompressed text we're capturing. | |
96 | * | |
97 | * oops_buf[] holds the compressed text, preceded by a oops header. | |
98 | * oops header has u16 holding the version of oops header (to differentiate | |
99 | * between old and new format header) followed by u16 holding the length of | |
100 | * the compressed* text (*Or uncompressed, if compression fails.) and u64 | |
101 | * holding the timestamp. oops_buf[] gets written to NVRAM. | |
102 | * | |
103 | * oops_log_info points to the header. oops_data points to the compressed text. | |
104 | * | |
105 | * +- oops_buf | |
106 | * | +- oops_data | |
107 | * v v | |
108 | * +-----------+-----------+-----------+------------------------+ | |
109 | * | version | length | timestamp | text | | |
110 | * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) | | |
111 | * +-----------+-----------+-----------+------------------------+ | |
112 | * ^ | |
113 | * +- oops_log_info | |
114 | * | |
115 | * We preallocate these buffers during init to avoid kmalloc during oops/panic. | |
116 | */ | |
117 | static size_t big_oops_buf_sz; | |
118 | static char *big_oops_buf, *oops_buf; | |
119 | static char *oops_data; | |
120 | static size_t oops_data_sz; | |
121 | ||
122 | /* Compression parameters */ | |
123 | #define COMPR_LEVEL 6 | |
124 | #define WINDOW_BITS 12 | |
125 | #define MEM_LEVEL 4 | |
126 | static struct z_stream_s stream; | |
127 | ||
128 | #ifdef CONFIG_PSTORE | |
f7618299 HB |
129 | #ifdef CONFIG_PPC_POWERNV |
130 | static struct nvram_os_partition skiboot_partition = { | |
131 | .name = "ibm,skiboot", | |
132 | .index = -1, | |
133 | .os_partition = false | |
134 | }; | |
135 | #endif | |
136 | ||
78989f0a HB |
137 | #ifdef CONFIG_PPC_PSERIES |
138 | static struct nvram_os_partition of_config_partition = { | |
139 | .name = "of-config", | |
140 | .index = -1, | |
141 | .os_partition = false | |
142 | }; | |
143 | #endif | |
144 | ||
145 | static struct nvram_os_partition common_partition = { | |
146 | .name = "common", | |
147 | .index = -1, | |
148 | .os_partition = false | |
149 | }; | |
150 | ||
151 | static enum pstore_type_id nvram_type_ids[] = { | |
152 | PSTORE_TYPE_DMESG, | |
153 | PSTORE_TYPE_PPC_COMMON, | |
154 | -1, | |
155 | -1, | |
156 | -1 | |
157 | }; | |
158 | static int read_type; | |
159 | #endif | |
160 | ||
161 | /* nvram_write_os_partition | |
162 | * | |
163 | * We need to buffer the error logs into nvram to ensure that we have | |
164 | * the failure information to decode. If we have a severe error there | |
165 | * is no way to guarantee that the OS or the machine is in a state to | |
166 | * get back to user land and write the error to disk. For example if | |
167 | * the SCSI device driver causes a Machine Check by writing to a bad | |
168 | * IO address, there is no way of guaranteeing that the device driver | |
169 | * is in any state that is would also be able to write the error data | |
170 | * captured to disk, thus we buffer it in NVRAM for analysis on the | |
171 | * next boot. | |
172 | * | |
173 | * In NVRAM the partition containing the error log buffer will looks like: | |
174 | * Header (in bytes): | |
175 | * +-----------+----------+--------+------------+------------------+ | |
176 | * | signature | checksum | length | name | data | | |
177 | * |0 |1 |2 3|4 15|16 length-1| | |
178 | * +-----------+----------+--------+------------+------------------+ | |
179 | * | |
180 | * The 'data' section would look like (in bytes): | |
181 | * +--------------+------------+-----------------------------------+ | |
182 | * | event_logged | sequence # | error log | | |
183 | * |0 3|4 7|8 error_log_size-1| | |
184 | * +--------------+------------+-----------------------------------+ | |
185 | * | |
186 | * event_logged: 0 if event has not been logged to syslog, 1 if it has | |
187 | * sequence #: The unique sequence # for each event. (until it wraps) | |
188 | * error log: The error log from event_scan | |
189 | */ | |
190 | int nvram_write_os_partition(struct nvram_os_partition *part, | |
191 | char *buff, int length, | |
192 | unsigned int err_type, | |
193 | unsigned int error_log_cnt) | |
194 | { | |
195 | int rc; | |
196 | loff_t tmp_index; | |
197 | struct err_log_info info; | |
198 | ||
199 | if (part->index == -1) | |
200 | return -ESPIPE; | |
201 | ||
202 | if (length > part->size) | |
203 | length = part->size; | |
204 | ||
205 | info.error_type = cpu_to_be32(err_type); | |
206 | info.seq_num = cpu_to_be32(error_log_cnt); | |
207 | ||
208 | tmp_index = part->index; | |
209 | ||
210 | rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), | |
211 | &tmp_index); | |
212 | if (rc <= 0) { | |
213 | pr_err("%s: Failed nvram_write (%d)\n", __func__, rc); | |
214 | return rc; | |
215 | } | |
216 | ||
217 | rc = ppc_md.nvram_write(buff, length, &tmp_index); | |
218 | if (rc <= 0) { | |
219 | pr_err("%s: Failed nvram_write (%d)\n", __func__, rc); | |
220 | return rc; | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | /* nvram_read_partition | |
227 | * | |
228 | * Reads nvram partition for at most 'length' | |
229 | */ | |
230 | int nvram_read_partition(struct nvram_os_partition *part, char *buff, | |
231 | int length, unsigned int *err_type, | |
232 | unsigned int *error_log_cnt) | |
233 | { | |
234 | int rc; | |
235 | loff_t tmp_index; | |
236 | struct err_log_info info; | |
237 | ||
238 | if (part->index == -1) | |
239 | return -1; | |
240 | ||
241 | if (length > part->size) | |
242 | length = part->size; | |
243 | ||
244 | tmp_index = part->index; | |
245 | ||
246 | if (part->os_partition) { | |
247 | rc = ppc_md.nvram_read((char *)&info, | |
248 | sizeof(struct err_log_info), | |
249 | &tmp_index); | |
250 | if (rc <= 0) { | |
251 | pr_err("%s: Failed nvram_read (%d)\n", __func__, rc); | |
252 | return rc; | |
253 | } | |
254 | } | |
255 | ||
256 | rc = ppc_md.nvram_read(buff, length, &tmp_index); | |
257 | if (rc <= 0) { | |
258 | pr_err("%s: Failed nvram_read (%d)\n", __func__, rc); | |
259 | return rc; | |
260 | } | |
261 | ||
262 | if (part->os_partition) { | |
263 | *error_log_cnt = be32_to_cpu(info.seq_num); | |
264 | *err_type = be32_to_cpu(info.error_type); | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | /* nvram_init_os_partition | |
271 | * | |
272 | * This sets up a partition with an "OS" signature. | |
273 | * | |
274 | * The general strategy is the following: | |
275 | * 1.) If a partition with the indicated name already exists... | |
276 | * - If it's large enough, use it. | |
277 | * - Otherwise, recycle it and keep going. | |
278 | * 2.) Search for a free partition that is large enough. | |
279 | * 3.) If there's not a free partition large enough, recycle any obsolete | |
280 | * OS partitions and try again. | |
281 | * 4.) Will first try getting a chunk that will satisfy the requested size. | |
282 | * 5.) If a chunk of the requested size cannot be allocated, then try finding | |
283 | * a chunk that will satisfy the minum needed. | |
284 | * | |
285 | * Returns 0 on success, else -1. | |
286 | */ | |
287 | int __init nvram_init_os_partition(struct nvram_os_partition *part) | |
288 | { | |
289 | loff_t p; | |
290 | int size; | |
291 | ||
292 | /* Look for ours */ | |
293 | p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size); | |
294 | ||
295 | /* Found one but too small, remove it */ | |
296 | if (p && size < part->min_size) { | |
297 | pr_info("nvram: Found too small %s partition," | |
298 | " removing it...\n", part->name); | |
299 | nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL); | |
300 | p = 0; | |
301 | } | |
302 | ||
303 | /* Create one if we didn't find */ | |
304 | if (!p) { | |
305 | p = nvram_create_partition(part->name, NVRAM_SIG_OS, | |
306 | part->req_size, part->min_size); | |
307 | if (p == -ENOSPC) { | |
308 | pr_info("nvram: No room to create %s partition, " | |
309 | "deleting any obsolete OS partitions...\n", | |
310 | part->name); | |
311 | nvram_remove_partition(NULL, NVRAM_SIG_OS, | |
312 | nvram_os_partitions); | |
313 | p = nvram_create_partition(part->name, NVRAM_SIG_OS, | |
314 | part->req_size, part->min_size); | |
315 | } | |
316 | } | |
317 | ||
318 | if (p <= 0) { | |
319 | pr_err("nvram: Failed to find or create %s" | |
320 | " partition, err %d\n", part->name, (int)p); | |
321 | return -1; | |
322 | } | |
323 | ||
324 | part->index = p; | |
325 | part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info); | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | /* Derived from logfs_compress() */ | |
331 | static int nvram_compress(const void *in, void *out, size_t inlen, | |
332 | size_t outlen) | |
333 | { | |
334 | int err, ret; | |
335 | ||
336 | ret = -EIO; | |
337 | err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS, | |
338 | MEM_LEVEL, Z_DEFAULT_STRATEGY); | |
339 | if (err != Z_OK) | |
340 | goto error; | |
341 | ||
342 | stream.next_in = in; | |
343 | stream.avail_in = inlen; | |
344 | stream.total_in = 0; | |
345 | stream.next_out = out; | |
346 | stream.avail_out = outlen; | |
347 | stream.total_out = 0; | |
348 | ||
349 | err = zlib_deflate(&stream, Z_FINISH); | |
350 | if (err != Z_STREAM_END) | |
351 | goto error; | |
352 | ||
353 | err = zlib_deflateEnd(&stream); | |
354 | if (err != Z_OK) | |
355 | goto error; | |
356 | ||
357 | if (stream.total_out >= stream.total_in) | |
358 | goto error; | |
359 | ||
360 | ret = stream.total_out; | |
361 | error: | |
362 | return ret; | |
363 | } | |
364 | ||
365 | /* Compress the text from big_oops_buf into oops_buf. */ | |
366 | static int zip_oops(size_t text_len) | |
367 | { | |
368 | struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf; | |
369 | int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len, | |
370 | oops_data_sz); | |
371 | if (zipped_len < 0) { | |
372 | pr_err("nvram: compression failed; returned %d\n", zipped_len); | |
373 | pr_err("nvram: logging uncompressed oops/panic report\n"); | |
374 | return -1; | |
375 | } | |
376 | oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); | |
377 | oops_hdr->report_length = cpu_to_be16(zipped_len); | |
e4a9616c | 378 | oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); |
78989f0a HB |
379 | return 0; |
380 | } | |
381 | ||
382 | #ifdef CONFIG_PSTORE | |
383 | static int nvram_pstore_open(struct pstore_info *psi) | |
384 | { | |
385 | /* Reset the iterator to start reading partitions again */ | |
386 | read_type = -1; | |
387 | return 0; | |
388 | } | |
389 | ||
390 | /** | |
391 | * nvram_pstore_write - pstore write callback for nvram | |
392 | * @type: Type of message logged | |
393 | * @reason: reason behind dump (oops/panic) | |
394 | * @id: identifier to indicate the write performed | |
395 | * @part: pstore writes data to registered buffer in parts, | |
396 | * part number will indicate the same. | |
397 | * @count: Indicates oops count | |
398 | * @compressed: Flag to indicate the log is compressed | |
399 | * @size: number of bytes written to the registered buffer | |
400 | * @psi: registered pstore_info structure | |
401 | * | |
402 | * Called by pstore_dump() when an oops or panic report is logged in the | |
403 | * printk buffer. | |
404 | * Returns 0 on successful write. | |
405 | */ | |
406 | static int nvram_pstore_write(enum pstore_type_id type, | |
407 | enum kmsg_dump_reason reason, | |
408 | u64 *id, unsigned int part, int count, | |
409 | bool compressed, size_t size, | |
410 | struct pstore_info *psi) | |
411 | { | |
412 | int rc; | |
413 | unsigned int err_type = ERR_TYPE_KERNEL_PANIC; | |
414 | struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf; | |
415 | ||
416 | /* part 1 has the recent messages from printk buffer */ | |
417 | if (part > 1 || (type != PSTORE_TYPE_DMESG)) | |
418 | return -1; | |
419 | ||
420 | if (clobbering_unread_rtas_event()) | |
421 | return -1; | |
422 | ||
423 | oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); | |
424 | oops_hdr->report_length = cpu_to_be16(size); | |
e4a9616c | 425 | oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); |
78989f0a HB |
426 | |
427 | if (compressed) | |
428 | err_type = ERR_TYPE_KERNEL_PANIC_GZ; | |
429 | ||
430 | rc = nvram_write_os_partition(&oops_log_partition, oops_buf, | |
431 | (int) (sizeof(*oops_hdr) + size), err_type, count); | |
432 | ||
433 | if (rc != 0) | |
434 | return rc; | |
435 | ||
436 | *id = part; | |
437 | return 0; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Reads the oops/panic report, rtas, of-config and common partition. | |
442 | * Returns the length of the data we read from each partition. | |
443 | * Returns 0 if we've been called before. | |
444 | */ | |
445 | static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type, | |
446 | int *count, struct timespec *time, char **buf, | |
447 | bool *compressed, struct pstore_info *psi) | |
448 | { | |
449 | struct oops_log_info *oops_hdr; | |
450 | unsigned int err_type, id_no, size = 0; | |
451 | struct nvram_os_partition *part = NULL; | |
452 | char *buff = NULL; | |
453 | int sig = 0; | |
454 | loff_t p; | |
455 | ||
456 | read_type++; | |
457 | ||
458 | switch (nvram_type_ids[read_type]) { | |
459 | case PSTORE_TYPE_DMESG: | |
460 | part = &oops_log_partition; | |
461 | *type = PSTORE_TYPE_DMESG; | |
462 | break; | |
463 | case PSTORE_TYPE_PPC_COMMON: | |
464 | sig = NVRAM_SIG_SYS; | |
465 | part = &common_partition; | |
466 | *type = PSTORE_TYPE_PPC_COMMON; | |
467 | *id = PSTORE_TYPE_PPC_COMMON; | |
468 | time->tv_sec = 0; | |
469 | time->tv_nsec = 0; | |
470 | break; | |
471 | #ifdef CONFIG_PPC_PSERIES | |
472 | case PSTORE_TYPE_PPC_RTAS: | |
473 | part = &rtas_log_partition; | |
474 | *type = PSTORE_TYPE_PPC_RTAS; | |
475 | time->tv_sec = last_rtas_event; | |
476 | time->tv_nsec = 0; | |
477 | break; | |
478 | case PSTORE_TYPE_PPC_OF: | |
479 | sig = NVRAM_SIG_OF; | |
480 | part = &of_config_partition; | |
481 | *type = PSTORE_TYPE_PPC_OF; | |
482 | *id = PSTORE_TYPE_PPC_OF; | |
483 | time->tv_sec = 0; | |
484 | time->tv_nsec = 0; | |
485 | break; | |
f7618299 HB |
486 | #endif |
487 | #ifdef CONFIG_PPC_POWERNV | |
488 | case PSTORE_TYPE_PPC_OPAL: | |
489 | sig = NVRAM_SIG_FW; | |
490 | part = &skiboot_partition; | |
491 | *type = PSTORE_TYPE_PPC_OPAL; | |
492 | *id = PSTORE_TYPE_PPC_OPAL; | |
493 | time->tv_sec = 0; | |
494 | time->tv_nsec = 0; | |
495 | break; | |
78989f0a HB |
496 | #endif |
497 | default: | |
498 | return 0; | |
499 | } | |
500 | ||
501 | if (!part->os_partition) { | |
502 | p = nvram_find_partition(part->name, sig, &size); | |
503 | if (p <= 0) { | |
504 | pr_err("nvram: Failed to find partition %s, " | |
505 | "err %d\n", part->name, (int)p); | |
506 | return 0; | |
507 | } | |
508 | part->index = p; | |
509 | part->size = size; | |
510 | } | |
511 | ||
512 | buff = kmalloc(part->size, GFP_KERNEL); | |
513 | ||
514 | if (!buff) | |
515 | return -ENOMEM; | |
516 | ||
517 | if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) { | |
518 | kfree(buff); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | *count = 0; | |
523 | ||
524 | if (part->os_partition) | |
525 | *id = id_no; | |
526 | ||
527 | if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) { | |
528 | size_t length, hdr_size; | |
529 | ||
530 | oops_hdr = (struct oops_log_info *)buff; | |
531 | if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) { | |
532 | /* Old format oops header had 2-byte record size */ | |
533 | hdr_size = sizeof(u16); | |
534 | length = be16_to_cpu(oops_hdr->version); | |
535 | time->tv_sec = 0; | |
536 | time->tv_nsec = 0; | |
537 | } else { | |
538 | hdr_size = sizeof(*oops_hdr); | |
539 | length = be16_to_cpu(oops_hdr->report_length); | |
540 | time->tv_sec = be64_to_cpu(oops_hdr->timestamp); | |
541 | time->tv_nsec = 0; | |
542 | } | |
fc9e9cbf | 543 | *buf = kmemdup(buff + hdr_size, length, GFP_KERNEL); |
78989f0a HB |
544 | if (*buf == NULL) |
545 | return -ENOMEM; | |
78989f0a HB |
546 | kfree(buff); |
547 | ||
548 | if (err_type == ERR_TYPE_KERNEL_PANIC_GZ) | |
549 | *compressed = true; | |
550 | else | |
551 | *compressed = false; | |
552 | return length; | |
553 | } | |
554 | ||
555 | *buf = buff; | |
556 | return part->size; | |
557 | } | |
558 | ||
559 | static struct pstore_info nvram_pstore_info = { | |
560 | .owner = THIS_MODULE, | |
561 | .name = "nvram", | |
562 | .open = nvram_pstore_open, | |
563 | .read = nvram_pstore_read, | |
564 | .write = nvram_pstore_write, | |
565 | }; | |
566 | ||
567 | static int nvram_pstore_init(void) | |
568 | { | |
569 | int rc = 0; | |
570 | ||
f7618299 HB |
571 | if (machine_is(pseries)) { |
572 | nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS; | |
573 | nvram_type_ids[3] = PSTORE_TYPE_PPC_OF; | |
574 | } else | |
575 | nvram_type_ids[2] = PSTORE_TYPE_PPC_OPAL; | |
78989f0a HB |
576 | |
577 | nvram_pstore_info.buf = oops_data; | |
578 | nvram_pstore_info.bufsize = oops_data_sz; | |
579 | ||
580 | spin_lock_init(&nvram_pstore_info.buf_lock); | |
581 | ||
582 | rc = pstore_register(&nvram_pstore_info); | |
74943dab HB |
583 | if (rc && (rc != -EPERM)) |
584 | /* Print error only when pstore.backend == nvram */ | |
585 | pr_err("nvram: pstore_register() failed, returned %d. " | |
586 | "Defaults to kmsg_dump\n", rc); | |
78989f0a HB |
587 | |
588 | return rc; | |
589 | } | |
590 | #else | |
591 | static int nvram_pstore_init(void) | |
592 | { | |
593 | return -1; | |
594 | } | |
595 | #endif | |
596 | ||
597 | void __init nvram_init_oops_partition(int rtas_partition_exists) | |
598 | { | |
599 | int rc; | |
600 | ||
601 | rc = nvram_init_os_partition(&oops_log_partition); | |
602 | if (rc != 0) { | |
603 | #ifdef CONFIG_PPC_PSERIES | |
604 | if (!rtas_partition_exists) { | |
605 | pr_err("nvram: Failed to initialize oops partition!"); | |
606 | return; | |
607 | } | |
608 | pr_notice("nvram: Using %s partition to log both" | |
609 | " RTAS errors and oops/panic reports\n", | |
610 | rtas_log_partition.name); | |
611 | memcpy(&oops_log_partition, &rtas_log_partition, | |
612 | sizeof(rtas_log_partition)); | |
613 | #else | |
614 | pr_err("nvram: Failed to initialize oops partition!"); | |
615 | return; | |
616 | #endif | |
617 | } | |
618 | oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL); | |
619 | if (!oops_buf) { | |
620 | pr_err("nvram: No memory for %s partition\n", | |
621 | oops_log_partition.name); | |
622 | return; | |
623 | } | |
624 | oops_data = oops_buf + sizeof(struct oops_log_info); | |
625 | oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info); | |
626 | ||
627 | rc = nvram_pstore_init(); | |
628 | ||
629 | if (!rc) | |
630 | return; | |
631 | ||
632 | /* | |
633 | * Figure compression (preceded by elimination of each line's <n> | |
634 | * severity prefix) will reduce the oops/panic report to at most | |
635 | * 45% of its original size. | |
636 | */ | |
637 | big_oops_buf_sz = (oops_data_sz * 100) / 45; | |
638 | big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL); | |
639 | if (big_oops_buf) { | |
640 | stream.workspace = kmalloc(zlib_deflate_workspacesize( | |
641 | WINDOW_BITS, MEM_LEVEL), GFP_KERNEL); | |
642 | if (!stream.workspace) { | |
643 | pr_err("nvram: No memory for compression workspace; " | |
644 | "skipping compression of %s partition data\n", | |
645 | oops_log_partition.name); | |
646 | kfree(big_oops_buf); | |
647 | big_oops_buf = NULL; | |
648 | } | |
649 | } else { | |
650 | pr_err("No memory for uncompressed %s data; " | |
651 | "skipping compression\n", oops_log_partition.name); | |
652 | stream.workspace = NULL; | |
653 | } | |
654 | ||
655 | rc = kmsg_dump_register(&nvram_kmsg_dumper); | |
656 | if (rc != 0) { | |
657 | pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc); | |
658 | kfree(oops_buf); | |
659 | kfree(big_oops_buf); | |
660 | kfree(stream.workspace); | |
661 | } | |
662 | } | |
663 | ||
664 | /* | |
665 | * This is our kmsg_dump callback, called after an oops or panic report | |
666 | * has been written to the printk buffer. We want to capture as much | |
667 | * of the printk buffer as possible. First, capture as much as we can | |
668 | * that we think will compress sufficiently to fit in the lnx,oops-log | |
669 | * partition. If that's too much, go back and capture uncompressed text. | |
670 | */ | |
671 | static void oops_to_nvram(struct kmsg_dumper *dumper, | |
672 | enum kmsg_dump_reason reason) | |
673 | { | |
674 | struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf; | |
675 | static unsigned int oops_count = 0; | |
676 | static bool panicking = false; | |
677 | static DEFINE_SPINLOCK(lock); | |
678 | unsigned long flags; | |
679 | size_t text_len; | |
680 | unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ; | |
681 | int rc = -1; | |
682 | ||
683 | switch (reason) { | |
684 | case KMSG_DUMP_RESTART: | |
685 | case KMSG_DUMP_HALT: | |
686 | case KMSG_DUMP_POWEROFF: | |
687 | /* These are almost always orderly shutdowns. */ | |
688 | return; | |
689 | case KMSG_DUMP_OOPS: | |
690 | break; | |
691 | case KMSG_DUMP_PANIC: | |
692 | panicking = true; | |
693 | break; | |
694 | case KMSG_DUMP_EMERG: | |
695 | if (panicking) | |
696 | /* Panic report already captured. */ | |
697 | return; | |
698 | break; | |
699 | default: | |
700 | pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n", | |
701 | __func__, (int) reason); | |
702 | return; | |
703 | } | |
704 | ||
705 | if (clobbering_unread_rtas_event()) | |
706 | return; | |
707 | ||
708 | if (!spin_trylock_irqsave(&lock, flags)) | |
709 | return; | |
710 | ||
711 | if (big_oops_buf) { | |
712 | kmsg_dump_get_buffer(dumper, false, | |
713 | big_oops_buf, big_oops_buf_sz, &text_len); | |
714 | rc = zip_oops(text_len); | |
715 | } | |
716 | if (rc != 0) { | |
717 | kmsg_dump_rewind(dumper); | |
718 | kmsg_dump_get_buffer(dumper, false, | |
719 | oops_data, oops_data_sz, &text_len); | |
720 | err_type = ERR_TYPE_KERNEL_PANIC; | |
721 | oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); | |
722 | oops_hdr->report_length = cpu_to_be16(text_len); | |
e4a9616c | 723 | oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); |
78989f0a HB |
724 | } |
725 | ||
726 | (void) nvram_write_os_partition(&oops_log_partition, oops_buf, | |
727 | (int) (sizeof(*oops_hdr) + text_len), err_type, | |
728 | ++oops_count); | |
729 | ||
730 | spin_unlock_irqrestore(&lock, flags); | |
731 | } | |
732 | ||
1da177e4 LT |
733 | static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) |
734 | { | |
1da177e4 LT |
735 | if (ppc_md.nvram_size == NULL) |
736 | return -ENODEV; | |
b808b1d6 AV |
737 | return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE, |
738 | ppc_md.nvram_size()); | |
1da177e4 LT |
739 | } |
740 | ||
741 | ||
742 | static ssize_t dev_nvram_read(struct file *file, char __user *buf, | |
743 | size_t count, loff_t *ppos) | |
744 | { | |
f9ce299f AB |
745 | ssize_t ret; |
746 | char *tmp = NULL; | |
747 | ssize_t size; | |
1da177e4 | 748 | |
7029705a CG |
749 | if (!ppc_md.nvram_size) { |
750 | ret = -ENODEV; | |
f9ce299f | 751 | goto out; |
7029705a | 752 | } |
f9ce299f | 753 | |
1da177e4 | 754 | size = ppc_md.nvram_size(); |
7029705a CG |
755 | if (size < 0) { |
756 | ret = size; | |
f9ce299f | 757 | goto out; |
7029705a CG |
758 | } |
759 | ||
760 | if (*ppos >= size) { | |
761 | ret = 0; | |
762 | goto out; | |
763 | } | |
1da177e4 | 764 | |
f9ce299f AB |
765 | count = min_t(size_t, count, size - *ppos); |
766 | count = min(count, PAGE_SIZE); | |
1da177e4 | 767 | |
f9ce299f | 768 | tmp = kmalloc(count, GFP_KERNEL); |
7029705a CG |
769 | if (!tmp) { |
770 | ret = -ENOMEM; | |
f9ce299f | 771 | goto out; |
7029705a | 772 | } |
1da177e4 | 773 | |
f9ce299f AB |
774 | ret = ppc_md.nvram_read(tmp, count, ppos); |
775 | if (ret <= 0) | |
776 | goto out; | |
777 | ||
778 | if (copy_to_user(buf, tmp, ret)) | |
779 | ret = -EFAULT; | |
1da177e4 | 780 | |
f9ce299f AB |
781 | out: |
782 | kfree(tmp); | |
783 | return ret; | |
1da177e4 LT |
784 | |
785 | } | |
786 | ||
787 | static ssize_t dev_nvram_write(struct file *file, const char __user *buf, | |
f9ce299f | 788 | size_t count, loff_t *ppos) |
1da177e4 | 789 | { |
f9ce299f AB |
790 | ssize_t ret; |
791 | char *tmp = NULL; | |
792 | ssize_t size; | |
1da177e4 | 793 | |
f9ce299f AB |
794 | ret = -ENODEV; |
795 | if (!ppc_md.nvram_size) | |
796 | goto out; | |
797 | ||
798 | ret = 0; | |
1da177e4 | 799 | size = ppc_md.nvram_size(); |
f9ce299f AB |
800 | if (*ppos >= size || size < 0) |
801 | goto out; | |
1da177e4 | 802 | |
f9ce299f AB |
803 | count = min_t(size_t, count, size - *ppos); |
804 | count = min(count, PAGE_SIZE); | |
1da177e4 | 805 | |
f9ce299f AB |
806 | ret = -ENOMEM; |
807 | tmp = kmalloc(count, GFP_KERNEL); | |
808 | if (!tmp) | |
809 | goto out; | |
810 | ||
811 | ret = -EFAULT; | |
812 | if (copy_from_user(tmp, buf, count)) | |
813 | goto out; | |
814 | ||
815 | ret = ppc_md.nvram_write(tmp, count, ppos); | |
816 | ||
817 | out: | |
818 | kfree(tmp); | |
819 | return ret; | |
1da177e4 | 820 | |
1da177e4 LT |
821 | } |
822 | ||
3b03fecd TG |
823 | static long dev_nvram_ioctl(struct file *file, unsigned int cmd, |
824 | unsigned long arg) | |
1da177e4 LT |
825 | { |
826 | switch(cmd) { | |
827 | #ifdef CONFIG_PPC_PMAC | |
828 | case OBSOLETE_PMAC_NVRAM_GET_OFFSET: | |
829 | printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); | |
830 | case IOC_NVRAM_GET_OFFSET: { | |
831 | int part, offset; | |
832 | ||
e8222502 | 833 | if (!machine_is(powermac)) |
1da177e4 LT |
834 | return -EINVAL; |
835 | if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0) | |
836 | return -EFAULT; | |
837 | if (part < pmac_nvram_OF || part > pmac_nvram_NR) | |
838 | return -EINVAL; | |
839 | offset = pmac_get_partition(part); | |
840 | if (offset < 0) | |
841 | return offset; | |
842 | if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) | |
843 | return -EFAULT; | |
844 | return 0; | |
845 | } | |
846 | #endif /* CONFIG_PPC_PMAC */ | |
af308377 SR |
847 | default: |
848 | return -EINVAL; | |
1da177e4 | 849 | } |
1da177e4 LT |
850 | } |
851 | ||
5dfe4c96 | 852 | const struct file_operations nvram_fops = { |
3b03fecd TG |
853 | .owner = THIS_MODULE, |
854 | .llseek = dev_nvram_llseek, | |
855 | .read = dev_nvram_read, | |
856 | .write = dev_nvram_write, | |
857 | .unlocked_ioctl = dev_nvram_ioctl, | |
1da177e4 LT |
858 | }; |
859 | ||
860 | static struct miscdevice nvram_dev = { | |
861 | NVRAM_MINOR, | |
862 | "nvram", | |
863 | &nvram_fops | |
864 | }; | |
865 | ||
866 | ||
867 | #ifdef DEBUG_NVRAM | |
32c105c3 | 868 | static void __init nvram_print_partitions(char * label) |
1da177e4 | 869 | { |
1da177e4 LT |
870 | struct nvram_partition * tmp_part; |
871 | ||
872 | printk(KERN_WARNING "--------%s---------\n", label); | |
873 | printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); | |
690d1a9b | 874 | list_for_each_entry(tmp_part, &nvram_partitions, partition) { |
e0513d9e | 875 | printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12.12s\n", |
1da177e4 LT |
876 | tmp_part->index, tmp_part->header.signature, |
877 | tmp_part->header.checksum, tmp_part->header.length, | |
878 | tmp_part->header.name); | |
879 | } | |
880 | } | |
881 | #endif | |
882 | ||
883 | ||
32c105c3 | 884 | static int __init nvram_write_header(struct nvram_partition * part) |
1da177e4 LT |
885 | { |
886 | loff_t tmp_index; | |
887 | int rc; | |
c81095a4 CLG |
888 | struct nvram_header phead; |
889 | ||
890 | memcpy(&phead, &part->header, NVRAM_HEADER_LEN); | |
891 | phead.length = cpu_to_be16(phead.length); | |
892 | ||
1da177e4 | 893 | tmp_index = part->index; |
c81095a4 | 894 | rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index); |
1da177e4 LT |
895 | |
896 | return rc; | |
897 | } | |
898 | ||
899 | ||
32c105c3 | 900 | static unsigned char __init nvram_checksum(struct nvram_header *p) |
1da177e4 LT |
901 | { |
902 | unsigned int c_sum, c_sum2; | |
903 | unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ | |
904 | c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; | |
905 | ||
906 | /* The sum may have spilled into the 3rd byte. Fold it back. */ | |
907 | c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; | |
908 | /* The sum cannot exceed 2 bytes. Fold it into a checksum */ | |
909 | c_sum2 = (c_sum >> 8) + (c_sum << 8); | |
910 | c_sum = ((c_sum + c_sum2) >> 8) & 0xff; | |
911 | return c_sum; | |
912 | } | |
913 | ||
0f4ac132 JK |
914 | /* |
915 | * Per the criteria passed via nvram_remove_partition(), should this | |
916 | * partition be removed? 1=remove, 0=keep | |
917 | */ | |
918 | static int nvram_can_remove_partition(struct nvram_partition *part, | |
919 | const char *name, int sig, const char *exceptions[]) | |
920 | { | |
921 | if (part->header.signature != sig) | |
922 | return 0; | |
923 | if (name) { | |
924 | if (strncmp(name, part->header.name, 12)) | |
925 | return 0; | |
926 | } else if (exceptions) { | |
927 | const char **except; | |
928 | for (except = exceptions; *except; except++) { | |
929 | if (!strncmp(*except, part->header.name, 12)) | |
930 | return 0; | |
931 | } | |
932 | } | |
933 | return 1; | |
934 | } | |
935 | ||
fa2b4e54 BH |
936 | /** |
937 | * nvram_remove_partition - Remove one or more partitions in nvram | |
938 | * @name: name of the partition to remove, or NULL for a | |
939 | * signature only match | |
940 | * @sig: signature of the partition(s) to remove | |
0f4ac132 JK |
941 | * @exceptions: When removing all partitions with a matching signature, |
942 | * leave these alone. | |
fa2b4e54 BH |
943 | */ |
944 | ||
0f4ac132 JK |
945 | int __init nvram_remove_partition(const char *name, int sig, |
946 | const char *exceptions[]) | |
1da177e4 | 947 | { |
fa2b4e54 | 948 | struct nvram_partition *part, *prev, *tmp; |
1da177e4 LT |
949 | int rc; |
950 | ||
690d1a9b | 951 | list_for_each_entry(part, &nvram_partitions, partition) { |
0f4ac132 | 952 | if (!nvram_can_remove_partition(part, name, sig, exceptions)) |
fa2b4e54 BH |
953 | continue; |
954 | ||
955 | /* Make partition a free partition */ | |
1da177e4 | 956 | part->header.signature = NVRAM_SIG_FREE; |
6024ede9 | 957 | strncpy(part->header.name, "wwwwwwwwwwww", 12); |
1da177e4 | 958 | part->header.checksum = nvram_checksum(&part->header); |
1da177e4 LT |
959 | rc = nvram_write_header(part); |
960 | if (rc <= 0) { | |
fa2b4e54 | 961 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); |
1da177e4 LT |
962 | return rc; |
963 | } | |
fa2b4e54 | 964 | } |
1da177e4 | 965 | |
fa2b4e54 BH |
966 | /* Merge contiguous ones */ |
967 | prev = NULL; | |
690d1a9b | 968 | list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) { |
fa2b4e54 BH |
969 | if (part->header.signature != NVRAM_SIG_FREE) { |
970 | prev = NULL; | |
971 | continue; | |
972 | } | |
973 | if (prev) { | |
974 | prev->header.length += part->header.length; | |
975 | prev->header.checksum = nvram_checksum(&part->header); | |
976 | rc = nvram_write_header(part); | |
977 | if (rc <= 0) { | |
978 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); | |
979 | return rc; | |
980 | } | |
981 | list_del(&part->partition); | |
982 | kfree(part); | |
983 | } else | |
984 | prev = part; | |
1da177e4 LT |
985 | } |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
4e7c77a3 BH |
990 | /** |
991 | * nvram_create_partition - Create a partition in nvram | |
992 | * @name: name of the partition to create | |
993 | * @sig: signature of the partition to create | |
36673307 | 994 | * @req_size: size of data to allocate in bytes |
4e7c77a3 | 995 | * @min_size: minimum acceptable size (0 means req_size) |
e49e2e87 BH |
996 | * |
997 | * Returns a negative error code or a positive nvram index | |
998 | * of the beginning of the data area of the newly created | |
999 | * partition. If you provided a min_size smaller than req_size | |
1000 | * you need to query for the actual size yourself after the | |
1001 | * call using nvram_partition_get_size(). | |
1da177e4 | 1002 | */ |
edc79a2f BH |
1003 | loff_t __init nvram_create_partition(const char *name, int sig, |
1004 | int req_size, int min_size) | |
1da177e4 | 1005 | { |
a341ad97 AB |
1006 | struct nvram_partition *part; |
1007 | struct nvram_partition *new_part; | |
0339ad77 | 1008 | struct nvram_partition *free_part = NULL; |
cef0d5ad | 1009 | static char nv_init_vals[16]; |
1da177e4 LT |
1010 | loff_t tmp_index; |
1011 | long size = 0; | |
1012 | int rc; | |
4e7c77a3 | 1013 | |
36673307 BH |
1014 | /* Convert sizes from bytes to blocks */ |
1015 | req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; | |
1016 | min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; | |
1017 | ||
4e7c77a3 BH |
1018 | /* If no minimum size specified, make it the same as the |
1019 | * requested size | |
1020 | */ | |
1021 | if (min_size == 0) | |
1022 | min_size = req_size; | |
e49e2e87 BH |
1023 | if (min_size > req_size) |
1024 | return -EINVAL; | |
4e7c77a3 | 1025 | |
36673307 BH |
1026 | /* Now add one block to each for the header */ |
1027 | req_size += 1; | |
1028 | min_size += 1; | |
1029 | ||
1da177e4 LT |
1030 | /* Find a free partition that will give us the maximum needed size |
1031 | If can't find one that will give us the minimum size needed */ | |
690d1a9b | 1032 | list_for_each_entry(part, &nvram_partitions, partition) { |
1da177e4 LT |
1033 | if (part->header.signature != NVRAM_SIG_FREE) |
1034 | continue; | |
1035 | ||
4e7c77a3 BH |
1036 | if (part->header.length >= req_size) { |
1037 | size = req_size; | |
1da177e4 LT |
1038 | free_part = part; |
1039 | break; | |
1040 | } | |
4e7c77a3 BH |
1041 | if (part->header.length > size && |
1042 | part->header.length >= min_size) { | |
1043 | size = part->header.length; | |
1da177e4 LT |
1044 | free_part = part; |
1045 | } | |
1046 | } | |
0339ad77 | 1047 | if (!size) |
1da177e4 | 1048 | return -ENOSPC; |
1da177e4 LT |
1049 | |
1050 | /* Create our OS partition */ | |
0339ad77 | 1051 | new_part = kmalloc(sizeof(*new_part), GFP_KERNEL); |
1da177e4 | 1052 | if (!new_part) { |
b6080db4 | 1053 | pr_err("%s: kmalloc failed\n", __func__); |
1da177e4 LT |
1054 | return -ENOMEM; |
1055 | } | |
1056 | ||
1057 | new_part->index = free_part->index; | |
4e7c77a3 | 1058 | new_part->header.signature = sig; |
1da177e4 | 1059 | new_part->header.length = size; |
4e7c77a3 | 1060 | strncpy(new_part->header.name, name, 12); |
1da177e4 LT |
1061 | new_part->header.checksum = nvram_checksum(&new_part->header); |
1062 | ||
1063 | rc = nvram_write_header(new_part); | |
1064 | if (rc <= 0) { | |
b6080db4 | 1065 | pr_err("%s: nvram_write_header failed (%d)\n", __func__, rc); |
7d523187 | 1066 | kfree(new_part); |
1da177e4 LT |
1067 | return rc; |
1068 | } | |
e49e2e87 BH |
1069 | list_add_tail(&new_part->partition, &free_part->partition); |
1070 | ||
1071 | /* Adjust or remove the partition we stole the space from */ | |
1072 | if (free_part->header.length > size) { | |
1073 | free_part->index += size * NVRAM_BLOCK_LEN; | |
1074 | free_part->header.length -= size; | |
1075 | free_part->header.checksum = nvram_checksum(&free_part->header); | |
1076 | rc = nvram_write_header(free_part); | |
1077 | if (rc <= 0) { | |
b6080db4 CJ |
1078 | pr_err("%s: nvram_write_header failed (%d)\n", |
1079 | __func__, rc); | |
e49e2e87 BH |
1080 | return rc; |
1081 | } | |
1082 | } else { | |
1083 | list_del(&free_part->partition); | |
1084 | kfree(free_part); | |
1085 | } | |
1da177e4 | 1086 | |
e49e2e87 | 1087 | /* Clear the new partition */ |
cef0d5ad BH |
1088 | for (tmp_index = new_part->index + NVRAM_HEADER_LEN; |
1089 | tmp_index < ((size - 1) * NVRAM_BLOCK_LEN); | |
1090 | tmp_index += NVRAM_BLOCK_LEN) { | |
1091 | rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index); | |
1092 | if (rc <= 0) { | |
b6080db4 CJ |
1093 | pr_err("%s: nvram_write failed (%d)\n", |
1094 | __func__, rc); | |
cef0d5ad BH |
1095 | return rc; |
1096 | } | |
1da177e4 | 1097 | } |
b6080db4 | 1098 | |
e49e2e87 BH |
1099 | return new_part->index + NVRAM_HEADER_LEN; |
1100 | } | |
1da177e4 | 1101 | |
e49e2e87 BH |
1102 | /** |
1103 | * nvram_get_partition_size - Get the data size of an nvram partition | |
1104 | * @data_index: This is the offset of the start of the data of | |
1105 | * the partition. The same value that is returned by | |
1106 | * nvram_create_partition(). | |
1107 | */ | |
edc79a2f | 1108 | int nvram_get_partition_size(loff_t data_index) |
e49e2e87 BH |
1109 | { |
1110 | struct nvram_partition *part; | |
1da177e4 | 1111 | |
690d1a9b | 1112 | list_for_each_entry(part, &nvram_partitions, partition) { |
e49e2e87 BH |
1113 | if (part->index + NVRAM_HEADER_LEN == data_index) |
1114 | return (part->header.length - 1) * NVRAM_BLOCK_LEN; | |
1da177e4 | 1115 | } |
e49e2e87 | 1116 | return -1; |
1da177e4 LT |
1117 | } |
1118 | ||
1119 | ||
cf5cbf9f BH |
1120 | /** |
1121 | * nvram_find_partition - Find an nvram partition by signature and name | |
1122 | * @name: Name of the partition or NULL for any name | |
1123 | * @sig: Signature to test against | |
1124 | * @out_size: if non-NULL, returns the size of the data part of the partition | |
1125 | */ | |
1126 | loff_t nvram_find_partition(const char *name, int sig, int *out_size) | |
1127 | { | |
1128 | struct nvram_partition *p; | |
1129 | ||
690d1a9b | 1130 | list_for_each_entry(p, &nvram_partitions, partition) { |
cf5cbf9f BH |
1131 | if (p->header.signature == sig && |
1132 | (!name || !strncmp(p->header.name, name, 12))) { | |
1133 | if (out_size) | |
1134 | *out_size = (p->header.length - 1) * | |
1135 | NVRAM_BLOCK_LEN; | |
1136 | return p->index + NVRAM_HEADER_LEN; | |
1137 | } | |
1138 | } | |
1139 | return 0; | |
1140 | } | |
1141 | ||
edc79a2f | 1142 | int __init nvram_scan_partitions(void) |
1da177e4 LT |
1143 | { |
1144 | loff_t cur_index = 0; | |
1145 | struct nvram_header phead; | |
1146 | struct nvram_partition * tmp_part; | |
1147 | unsigned char c_sum; | |
1148 | char * header; | |
1149 | int total_size; | |
1150 | int err; | |
1151 | ||
edc79a2f | 1152 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
1da177e4 LT |
1153 | return -ENODEV; |
1154 | total_size = ppc_md.nvram_size(); | |
1155 | ||
5cbded58 | 1156 | header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); |
1da177e4 LT |
1157 | if (!header) { |
1158 | printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); | |
1159 | return -ENOMEM; | |
1160 | } | |
1161 | ||
1162 | while (cur_index < total_size) { | |
1163 | ||
1164 | err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); | |
1165 | if (err != NVRAM_HEADER_LEN) { | |
1166 | printk(KERN_ERR "nvram_scan_partitions: Error parsing " | |
1167 | "nvram partitions\n"); | |
1168 | goto out; | |
1169 | } | |
1170 | ||
1171 | cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ | |
1172 | ||
1173 | memcpy(&phead, header, NVRAM_HEADER_LEN); | |
1174 | ||
c81095a4 CLG |
1175 | phead.length = be16_to_cpu(phead.length); |
1176 | ||
1da177e4 LT |
1177 | err = 0; |
1178 | c_sum = nvram_checksum(&phead); | |
1179 | if (c_sum != phead.checksum) { | |
1180 | printk(KERN_WARNING "WARNING: nvram partition checksum" | |
1181 | " was %02x, should be %02x!\n", | |
1182 | phead.checksum, c_sum); | |
1183 | printk(KERN_WARNING "Terminating nvram partition scan\n"); | |
1184 | goto out; | |
1185 | } | |
1186 | if (!phead.length) { | |
1187 | printk(KERN_WARNING "WARNING: nvram corruption " | |
1188 | "detected: 0-length partition\n"); | |
1189 | goto out; | |
1190 | } | |
6e51c9ff | 1191 | tmp_part = kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); |
1da177e4 LT |
1192 | err = -ENOMEM; |
1193 | if (!tmp_part) { | |
1194 | printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); | |
1195 | goto out; | |
1196 | } | |
1197 | ||
1198 | memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); | |
1199 | tmp_part->index = cur_index; | |
690d1a9b | 1200 | list_add_tail(&tmp_part->partition, &nvram_partitions); |
1da177e4 LT |
1201 | |
1202 | cur_index += phead.length * NVRAM_BLOCK_LEN; | |
1203 | } | |
1204 | err = 0; | |
1205 | ||
edc79a2f BH |
1206 | #ifdef DEBUG_NVRAM |
1207 | nvram_print_partitions("NVRAM Partitions"); | |
1208 | #endif | |
1209 | ||
1da177e4 LT |
1210 | out: |
1211 | kfree(header); | |
1212 | return err; | |
1213 | } | |
1214 | ||
1215 | static int __init nvram_init(void) | |
1216 | { | |
1da177e4 LT |
1217 | int rc; |
1218 | ||
578914cf BH |
1219 | BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); |
1220 | ||
1da177e4 LT |
1221 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
1222 | return -ENODEV; | |
1223 | ||
1224 | rc = misc_register(&nvram_dev); | |
1225 | if (rc != 0) { | |
1226 | printk(KERN_ERR "nvram_init: failed to register device\n"); | |
1227 | return rc; | |
1228 | } | |
1229 | ||
1da177e4 LT |
1230 | return rc; |
1231 | } | |
c0c52389 | 1232 | device_initcall(nvram_init); |