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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 | ||
18 | #include <linux/module.h> | |
19 | ||
20 | #include <linux/types.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/miscdevice.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/nvram.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/spinlock.h> | |
78989f0a | 29 | #include <linux/kmsg_dump.h> |
b808b1d6 | 30 | #include <linux/pagemap.h> |
78989f0a HB |
31 | #include <linux/pstore.h> |
32 | #include <linux/zlib.h> | |
1da177e4 LT |
33 | #include <asm/uaccess.h> |
34 | #include <asm/nvram.h> | |
35 | #include <asm/rtas.h> | |
36 | #include <asm/prom.h> | |
37 | #include <asm/machdep.h> | |
1da177e4 LT |
38 | |
39 | #undef DEBUG_NVRAM | |
40 | ||
36673307 BH |
41 | #define NVRAM_HEADER_LEN sizeof(struct nvram_header) |
42 | #define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN | |
74d51d02 BH |
43 | |
44 | /* If change this size, then change the size of NVNAME_LEN */ | |
45 | struct nvram_header { | |
46 | unsigned char signature; | |
47 | unsigned char checksum; | |
48 | unsigned short length; | |
6024ede9 | 49 | /* Terminating null required only for names < 12 chars. */ |
74d51d02 BH |
50 | char name[12]; |
51 | }; | |
52 | ||
53 | struct nvram_partition { | |
54 | struct list_head partition; | |
55 | struct nvram_header header; | |
56 | unsigned int index; | |
57 | }; | |
58 | ||
690d1a9b | 59 | static LIST_HEAD(nvram_partitions); |
1da177e4 | 60 | |
78989f0a HB |
61 | #ifdef CONFIG_PPC_PSERIES |
62 | struct nvram_os_partition rtas_log_partition = { | |
63 | .name = "ibm,rtas-log", | |
64 | .req_size = 2079, | |
65 | .min_size = 1055, | |
66 | .index = -1, | |
67 | .os_partition = true | |
68 | }; | |
69 | #endif | |
70 | ||
71 | struct nvram_os_partition oops_log_partition = { | |
72 | .name = "lnx,oops-log", | |
73 | .req_size = 4000, | |
74 | .min_size = 2000, | |
75 | .index = -1, | |
76 | .os_partition = true | |
77 | }; | |
78 | ||
79 | static const char *nvram_os_partitions[] = { | |
80 | #ifdef CONFIG_PPC_PSERIES | |
81 | "ibm,rtas-log", | |
82 | #endif | |
83 | "lnx,oops-log", | |
84 | NULL | |
85 | }; | |
86 | ||
87 | static void oops_to_nvram(struct kmsg_dumper *dumper, | |
88 | enum kmsg_dump_reason reason); | |
89 | ||
90 | static struct kmsg_dumper nvram_kmsg_dumper = { | |
91 | .dump = oops_to_nvram | |
92 | }; | |
93 | ||
94 | /* | |
95 | * For capturing and compressing an oops or panic report... | |
96 | ||
97 | * big_oops_buf[] holds the uncompressed text we're capturing. | |
98 | * | |
99 | * oops_buf[] holds the compressed text, preceded by a oops header. | |
100 | * oops header has u16 holding the version of oops header (to differentiate | |
101 | * between old and new format header) followed by u16 holding the length of | |
102 | * the compressed* text (*Or uncompressed, if compression fails.) and u64 | |
103 | * holding the timestamp. oops_buf[] gets written to NVRAM. | |
104 | * | |
105 | * oops_log_info points to the header. oops_data points to the compressed text. | |
106 | * | |
107 | * +- oops_buf | |
108 | * | +- oops_data | |
109 | * v v | |
110 | * +-----------+-----------+-----------+------------------------+ | |
111 | * | version | length | timestamp | text | | |
112 | * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) | | |
113 | * +-----------+-----------+-----------+------------------------+ | |
114 | * ^ | |
115 | * +- oops_log_info | |
116 | * | |
117 | * We preallocate these buffers during init to avoid kmalloc during oops/panic. | |
118 | */ | |
119 | static size_t big_oops_buf_sz; | |
120 | static char *big_oops_buf, *oops_buf; | |
121 | static char *oops_data; | |
122 | static size_t oops_data_sz; | |
123 | ||
124 | /* Compression parameters */ | |
125 | #define COMPR_LEVEL 6 | |
126 | #define WINDOW_BITS 12 | |
127 | #define MEM_LEVEL 4 | |
128 | static struct z_stream_s stream; | |
129 | ||
130 | #ifdef CONFIG_PSTORE | |
f7618299 HB |
131 | #ifdef CONFIG_PPC_POWERNV |
132 | static struct nvram_os_partition skiboot_partition = { | |
133 | .name = "ibm,skiboot", | |
134 | .index = -1, | |
135 | .os_partition = false | |
136 | }; | |
137 | #endif | |
138 | ||
78989f0a HB |
139 | #ifdef CONFIG_PPC_PSERIES |
140 | static struct nvram_os_partition of_config_partition = { | |
141 | .name = "of-config", | |
142 | .index = -1, | |
143 | .os_partition = false | |
144 | }; | |
145 | #endif | |
146 | ||
147 | static struct nvram_os_partition common_partition = { | |
148 | .name = "common", | |
149 | .index = -1, | |
150 | .os_partition = false | |
151 | }; | |
152 | ||
153 | static enum pstore_type_id nvram_type_ids[] = { | |
154 | PSTORE_TYPE_DMESG, | |
155 | PSTORE_TYPE_PPC_COMMON, | |
156 | -1, | |
157 | -1, | |
158 | -1 | |
159 | }; | |
160 | static int read_type; | |
161 | #endif | |
162 | ||
163 | /* nvram_write_os_partition | |
164 | * | |
165 | * We need to buffer the error logs into nvram to ensure that we have | |
166 | * the failure information to decode. If we have a severe error there | |
167 | * is no way to guarantee that the OS or the machine is in a state to | |
168 | * get back to user land and write the error to disk. For example if | |
169 | * the SCSI device driver causes a Machine Check by writing to a bad | |
170 | * IO address, there is no way of guaranteeing that the device driver | |
171 | * is in any state that is would also be able to write the error data | |
172 | * captured to disk, thus we buffer it in NVRAM for analysis on the | |
173 | * next boot. | |
174 | * | |
175 | * In NVRAM the partition containing the error log buffer will looks like: | |
176 | * Header (in bytes): | |
177 | * +-----------+----------+--------+------------+------------------+ | |
178 | * | signature | checksum | length | name | data | | |
179 | * |0 |1 |2 3|4 15|16 length-1| | |
180 | * +-----------+----------+--------+------------+------------------+ | |
181 | * | |
182 | * The 'data' section would look like (in bytes): | |
183 | * +--------------+------------+-----------------------------------+ | |
184 | * | event_logged | sequence # | error log | | |
185 | * |0 3|4 7|8 error_log_size-1| | |
186 | * +--------------+------------+-----------------------------------+ | |
187 | * | |
188 | * event_logged: 0 if event has not been logged to syslog, 1 if it has | |
189 | * sequence #: The unique sequence # for each event. (until it wraps) | |
190 | * error log: The error log from event_scan | |
191 | */ | |
192 | int nvram_write_os_partition(struct nvram_os_partition *part, | |
193 | char *buff, int length, | |
194 | unsigned int err_type, | |
195 | unsigned int error_log_cnt) | |
196 | { | |
197 | int rc; | |
198 | loff_t tmp_index; | |
199 | struct err_log_info info; | |
200 | ||
201 | if (part->index == -1) | |
202 | return -ESPIPE; | |
203 | ||
204 | if (length > part->size) | |
205 | length = part->size; | |
206 | ||
207 | info.error_type = cpu_to_be32(err_type); | |
208 | info.seq_num = cpu_to_be32(error_log_cnt); | |
209 | ||
210 | tmp_index = part->index; | |
211 | ||
212 | rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), | |
213 | &tmp_index); | |
214 | if (rc <= 0) { | |
215 | pr_err("%s: Failed nvram_write (%d)\n", __func__, rc); | |
216 | return rc; | |
217 | } | |
218 | ||
219 | rc = ppc_md.nvram_write(buff, length, &tmp_index); | |
220 | if (rc <= 0) { | |
221 | pr_err("%s: Failed nvram_write (%d)\n", __func__, rc); | |
222 | return rc; | |
223 | } | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | /* nvram_read_partition | |
229 | * | |
230 | * Reads nvram partition for at most 'length' | |
231 | */ | |
232 | int nvram_read_partition(struct nvram_os_partition *part, char *buff, | |
233 | int length, unsigned int *err_type, | |
234 | unsigned int *error_log_cnt) | |
235 | { | |
236 | int rc; | |
237 | loff_t tmp_index; | |
238 | struct err_log_info info; | |
239 | ||
240 | if (part->index == -1) | |
241 | return -1; | |
242 | ||
243 | if (length > part->size) | |
244 | length = part->size; | |
245 | ||
246 | tmp_index = part->index; | |
247 | ||
248 | if (part->os_partition) { | |
249 | rc = ppc_md.nvram_read((char *)&info, | |
250 | sizeof(struct err_log_info), | |
251 | &tmp_index); | |
252 | if (rc <= 0) { | |
253 | pr_err("%s: Failed nvram_read (%d)\n", __func__, rc); | |
254 | return rc; | |
255 | } | |
256 | } | |
257 | ||
258 | rc = ppc_md.nvram_read(buff, length, &tmp_index); | |
259 | if (rc <= 0) { | |
260 | pr_err("%s: Failed nvram_read (%d)\n", __func__, rc); | |
261 | return rc; | |
262 | } | |
263 | ||
264 | if (part->os_partition) { | |
265 | *error_log_cnt = be32_to_cpu(info.seq_num); | |
266 | *err_type = be32_to_cpu(info.error_type); | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | /* nvram_init_os_partition | |
273 | * | |
274 | * This sets up a partition with an "OS" signature. | |
275 | * | |
276 | * The general strategy is the following: | |
277 | * 1.) If a partition with the indicated name already exists... | |
278 | * - If it's large enough, use it. | |
279 | * - Otherwise, recycle it and keep going. | |
280 | * 2.) Search for a free partition that is large enough. | |
281 | * 3.) If there's not a free partition large enough, recycle any obsolete | |
282 | * OS partitions and try again. | |
283 | * 4.) Will first try getting a chunk that will satisfy the requested size. | |
284 | * 5.) If a chunk of the requested size cannot be allocated, then try finding | |
285 | * a chunk that will satisfy the minum needed. | |
286 | * | |
287 | * Returns 0 on success, else -1. | |
288 | */ | |
289 | int __init nvram_init_os_partition(struct nvram_os_partition *part) | |
290 | { | |
291 | loff_t p; | |
292 | int size; | |
293 | ||
294 | /* Look for ours */ | |
295 | p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size); | |
296 | ||
297 | /* Found one but too small, remove it */ | |
298 | if (p && size < part->min_size) { | |
299 | pr_info("nvram: Found too small %s partition," | |
300 | " removing it...\n", part->name); | |
301 | nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL); | |
302 | p = 0; | |
303 | } | |
304 | ||
305 | /* Create one if we didn't find */ | |
306 | if (!p) { | |
307 | p = nvram_create_partition(part->name, NVRAM_SIG_OS, | |
308 | part->req_size, part->min_size); | |
309 | if (p == -ENOSPC) { | |
310 | pr_info("nvram: No room to create %s partition, " | |
311 | "deleting any obsolete OS partitions...\n", | |
312 | part->name); | |
313 | nvram_remove_partition(NULL, NVRAM_SIG_OS, | |
314 | nvram_os_partitions); | |
315 | p = nvram_create_partition(part->name, NVRAM_SIG_OS, | |
316 | part->req_size, part->min_size); | |
317 | } | |
318 | } | |
319 | ||
320 | if (p <= 0) { | |
321 | pr_err("nvram: Failed to find or create %s" | |
322 | " partition, err %d\n", part->name, (int)p); | |
323 | return -1; | |
324 | } | |
325 | ||
326 | part->index = p; | |
327 | part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | /* Derived from logfs_compress() */ | |
333 | static int nvram_compress(const void *in, void *out, size_t inlen, | |
334 | size_t outlen) | |
335 | { | |
336 | int err, ret; | |
337 | ||
338 | ret = -EIO; | |
339 | err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS, | |
340 | MEM_LEVEL, Z_DEFAULT_STRATEGY); | |
341 | if (err != Z_OK) | |
342 | goto error; | |
343 | ||
344 | stream.next_in = in; | |
345 | stream.avail_in = inlen; | |
346 | stream.total_in = 0; | |
347 | stream.next_out = out; | |
348 | stream.avail_out = outlen; | |
349 | stream.total_out = 0; | |
350 | ||
351 | err = zlib_deflate(&stream, Z_FINISH); | |
352 | if (err != Z_STREAM_END) | |
353 | goto error; | |
354 | ||
355 | err = zlib_deflateEnd(&stream); | |
356 | if (err != Z_OK) | |
357 | goto error; | |
358 | ||
359 | if (stream.total_out >= stream.total_in) | |
360 | goto error; | |
361 | ||
362 | ret = stream.total_out; | |
363 | error: | |
364 | return ret; | |
365 | } | |
366 | ||
367 | /* Compress the text from big_oops_buf into oops_buf. */ | |
368 | static int zip_oops(size_t text_len) | |
369 | { | |
370 | struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf; | |
371 | int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len, | |
372 | oops_data_sz); | |
373 | if (zipped_len < 0) { | |
374 | pr_err("nvram: compression failed; returned %d\n", zipped_len); | |
375 | pr_err("nvram: logging uncompressed oops/panic report\n"); | |
376 | return -1; | |
377 | } | |
378 | oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); | |
379 | oops_hdr->report_length = cpu_to_be16(zipped_len); | |
e4a9616c | 380 | oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); |
78989f0a HB |
381 | return 0; |
382 | } | |
383 | ||
384 | #ifdef CONFIG_PSTORE | |
385 | static int nvram_pstore_open(struct pstore_info *psi) | |
386 | { | |
387 | /* Reset the iterator to start reading partitions again */ | |
388 | read_type = -1; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /** | |
393 | * nvram_pstore_write - pstore write callback for nvram | |
394 | * @type: Type of message logged | |
395 | * @reason: reason behind dump (oops/panic) | |
396 | * @id: identifier to indicate the write performed | |
397 | * @part: pstore writes data to registered buffer in parts, | |
398 | * part number will indicate the same. | |
399 | * @count: Indicates oops count | |
400 | * @compressed: Flag to indicate the log is compressed | |
401 | * @size: number of bytes written to the registered buffer | |
402 | * @psi: registered pstore_info structure | |
403 | * | |
404 | * Called by pstore_dump() when an oops or panic report is logged in the | |
405 | * printk buffer. | |
406 | * Returns 0 on successful write. | |
407 | */ | |
408 | static int nvram_pstore_write(enum pstore_type_id type, | |
409 | enum kmsg_dump_reason reason, | |
410 | u64 *id, unsigned int part, int count, | |
411 | bool compressed, size_t size, | |
412 | struct pstore_info *psi) | |
413 | { | |
414 | int rc; | |
415 | unsigned int err_type = ERR_TYPE_KERNEL_PANIC; | |
416 | struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf; | |
417 | ||
418 | /* part 1 has the recent messages from printk buffer */ | |
419 | if (part > 1 || (type != PSTORE_TYPE_DMESG)) | |
420 | return -1; | |
421 | ||
422 | if (clobbering_unread_rtas_event()) | |
423 | return -1; | |
424 | ||
425 | oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); | |
426 | oops_hdr->report_length = cpu_to_be16(size); | |
e4a9616c | 427 | oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); |
78989f0a HB |
428 | |
429 | if (compressed) | |
430 | err_type = ERR_TYPE_KERNEL_PANIC_GZ; | |
431 | ||
432 | rc = nvram_write_os_partition(&oops_log_partition, oops_buf, | |
433 | (int) (sizeof(*oops_hdr) + size), err_type, count); | |
434 | ||
435 | if (rc != 0) | |
436 | return rc; | |
437 | ||
438 | *id = part; | |
439 | return 0; | |
440 | } | |
441 | ||
442 | /* | |
443 | * Reads the oops/panic report, rtas, of-config and common partition. | |
444 | * Returns the length of the data we read from each partition. | |
445 | * Returns 0 if we've been called before. | |
446 | */ | |
447 | static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type, | |
448 | int *count, struct timespec *time, char **buf, | |
449 | bool *compressed, struct pstore_info *psi) | |
450 | { | |
451 | struct oops_log_info *oops_hdr; | |
452 | unsigned int err_type, id_no, size = 0; | |
453 | struct nvram_os_partition *part = NULL; | |
454 | char *buff = NULL; | |
455 | int sig = 0; | |
456 | loff_t p; | |
457 | ||
458 | read_type++; | |
459 | ||
460 | switch (nvram_type_ids[read_type]) { | |
461 | case PSTORE_TYPE_DMESG: | |
462 | part = &oops_log_partition; | |
463 | *type = PSTORE_TYPE_DMESG; | |
464 | break; | |
465 | case PSTORE_TYPE_PPC_COMMON: | |
466 | sig = NVRAM_SIG_SYS; | |
467 | part = &common_partition; | |
468 | *type = PSTORE_TYPE_PPC_COMMON; | |
469 | *id = PSTORE_TYPE_PPC_COMMON; | |
470 | time->tv_sec = 0; | |
471 | time->tv_nsec = 0; | |
472 | break; | |
473 | #ifdef CONFIG_PPC_PSERIES | |
474 | case PSTORE_TYPE_PPC_RTAS: | |
475 | part = &rtas_log_partition; | |
476 | *type = PSTORE_TYPE_PPC_RTAS; | |
477 | time->tv_sec = last_rtas_event; | |
478 | time->tv_nsec = 0; | |
479 | break; | |
480 | case PSTORE_TYPE_PPC_OF: | |
481 | sig = NVRAM_SIG_OF; | |
482 | part = &of_config_partition; | |
483 | *type = PSTORE_TYPE_PPC_OF; | |
484 | *id = PSTORE_TYPE_PPC_OF; | |
485 | time->tv_sec = 0; | |
486 | time->tv_nsec = 0; | |
487 | break; | |
f7618299 HB |
488 | #endif |
489 | #ifdef CONFIG_PPC_POWERNV | |
490 | case PSTORE_TYPE_PPC_OPAL: | |
491 | sig = NVRAM_SIG_FW; | |
492 | part = &skiboot_partition; | |
493 | *type = PSTORE_TYPE_PPC_OPAL; | |
494 | *id = PSTORE_TYPE_PPC_OPAL; | |
495 | time->tv_sec = 0; | |
496 | time->tv_nsec = 0; | |
497 | break; | |
78989f0a HB |
498 | #endif |
499 | default: | |
500 | return 0; | |
501 | } | |
502 | ||
503 | if (!part->os_partition) { | |
504 | p = nvram_find_partition(part->name, sig, &size); | |
505 | if (p <= 0) { | |
506 | pr_err("nvram: Failed to find partition %s, " | |
507 | "err %d\n", part->name, (int)p); | |
508 | return 0; | |
509 | } | |
510 | part->index = p; | |
511 | part->size = size; | |
512 | } | |
513 | ||
514 | buff = kmalloc(part->size, GFP_KERNEL); | |
515 | ||
516 | if (!buff) | |
517 | return -ENOMEM; | |
518 | ||
519 | if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) { | |
520 | kfree(buff); | |
521 | return 0; | |
522 | } | |
523 | ||
524 | *count = 0; | |
525 | ||
526 | if (part->os_partition) | |
527 | *id = id_no; | |
528 | ||
529 | if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) { | |
530 | size_t length, hdr_size; | |
531 | ||
532 | oops_hdr = (struct oops_log_info *)buff; | |
533 | if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) { | |
534 | /* Old format oops header had 2-byte record size */ | |
535 | hdr_size = sizeof(u16); | |
536 | length = be16_to_cpu(oops_hdr->version); | |
537 | time->tv_sec = 0; | |
538 | time->tv_nsec = 0; | |
539 | } else { | |
540 | hdr_size = sizeof(*oops_hdr); | |
541 | length = be16_to_cpu(oops_hdr->report_length); | |
542 | time->tv_sec = be64_to_cpu(oops_hdr->timestamp); | |
543 | time->tv_nsec = 0; | |
544 | } | |
fc9e9cbf | 545 | *buf = kmemdup(buff + hdr_size, length, GFP_KERNEL); |
78989f0a HB |
546 | if (*buf == NULL) |
547 | return -ENOMEM; | |
78989f0a HB |
548 | kfree(buff); |
549 | ||
550 | if (err_type == ERR_TYPE_KERNEL_PANIC_GZ) | |
551 | *compressed = true; | |
552 | else | |
553 | *compressed = false; | |
554 | return length; | |
555 | } | |
556 | ||
557 | *buf = buff; | |
558 | return part->size; | |
559 | } | |
560 | ||
561 | static struct pstore_info nvram_pstore_info = { | |
562 | .owner = THIS_MODULE, | |
563 | .name = "nvram", | |
564 | .open = nvram_pstore_open, | |
565 | .read = nvram_pstore_read, | |
566 | .write = nvram_pstore_write, | |
567 | }; | |
568 | ||
569 | static int nvram_pstore_init(void) | |
570 | { | |
571 | int rc = 0; | |
572 | ||
f7618299 HB |
573 | if (machine_is(pseries)) { |
574 | nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS; | |
575 | nvram_type_ids[3] = PSTORE_TYPE_PPC_OF; | |
576 | } else | |
577 | nvram_type_ids[2] = PSTORE_TYPE_PPC_OPAL; | |
78989f0a HB |
578 | |
579 | nvram_pstore_info.buf = oops_data; | |
580 | nvram_pstore_info.bufsize = oops_data_sz; | |
581 | ||
582 | spin_lock_init(&nvram_pstore_info.buf_lock); | |
583 | ||
584 | rc = pstore_register(&nvram_pstore_info); | |
74943dab HB |
585 | if (rc && (rc != -EPERM)) |
586 | /* Print error only when pstore.backend == nvram */ | |
587 | pr_err("nvram: pstore_register() failed, returned %d. " | |
588 | "Defaults to kmsg_dump\n", rc); | |
78989f0a HB |
589 | |
590 | return rc; | |
591 | } | |
592 | #else | |
593 | static int nvram_pstore_init(void) | |
594 | { | |
595 | return -1; | |
596 | } | |
597 | #endif | |
598 | ||
599 | void __init nvram_init_oops_partition(int rtas_partition_exists) | |
600 | { | |
601 | int rc; | |
602 | ||
603 | rc = nvram_init_os_partition(&oops_log_partition); | |
604 | if (rc != 0) { | |
605 | #ifdef CONFIG_PPC_PSERIES | |
606 | if (!rtas_partition_exists) { | |
607 | pr_err("nvram: Failed to initialize oops partition!"); | |
608 | return; | |
609 | } | |
610 | pr_notice("nvram: Using %s partition to log both" | |
611 | " RTAS errors and oops/panic reports\n", | |
612 | rtas_log_partition.name); | |
613 | memcpy(&oops_log_partition, &rtas_log_partition, | |
614 | sizeof(rtas_log_partition)); | |
615 | #else | |
616 | pr_err("nvram: Failed to initialize oops partition!"); | |
617 | return; | |
618 | #endif | |
619 | } | |
620 | oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL); | |
621 | if (!oops_buf) { | |
622 | pr_err("nvram: No memory for %s partition\n", | |
623 | oops_log_partition.name); | |
624 | return; | |
625 | } | |
626 | oops_data = oops_buf + sizeof(struct oops_log_info); | |
627 | oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info); | |
628 | ||
629 | rc = nvram_pstore_init(); | |
630 | ||
631 | if (!rc) | |
632 | return; | |
633 | ||
634 | /* | |
635 | * Figure compression (preceded by elimination of each line's <n> | |
636 | * severity prefix) will reduce the oops/panic report to at most | |
637 | * 45% of its original size. | |
638 | */ | |
639 | big_oops_buf_sz = (oops_data_sz * 100) / 45; | |
640 | big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL); | |
641 | if (big_oops_buf) { | |
642 | stream.workspace = kmalloc(zlib_deflate_workspacesize( | |
643 | WINDOW_BITS, MEM_LEVEL), GFP_KERNEL); | |
644 | if (!stream.workspace) { | |
645 | pr_err("nvram: No memory for compression workspace; " | |
646 | "skipping compression of %s partition data\n", | |
647 | oops_log_partition.name); | |
648 | kfree(big_oops_buf); | |
649 | big_oops_buf = NULL; | |
650 | } | |
651 | } else { | |
652 | pr_err("No memory for uncompressed %s data; " | |
653 | "skipping compression\n", oops_log_partition.name); | |
654 | stream.workspace = NULL; | |
655 | } | |
656 | ||
657 | rc = kmsg_dump_register(&nvram_kmsg_dumper); | |
658 | if (rc != 0) { | |
659 | pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc); | |
660 | kfree(oops_buf); | |
661 | kfree(big_oops_buf); | |
662 | kfree(stream.workspace); | |
663 | } | |
664 | } | |
665 | ||
666 | /* | |
667 | * This is our kmsg_dump callback, called after an oops or panic report | |
668 | * has been written to the printk buffer. We want to capture as much | |
669 | * of the printk buffer as possible. First, capture as much as we can | |
670 | * that we think will compress sufficiently to fit in the lnx,oops-log | |
671 | * partition. If that's too much, go back and capture uncompressed text. | |
672 | */ | |
673 | static void oops_to_nvram(struct kmsg_dumper *dumper, | |
674 | enum kmsg_dump_reason reason) | |
675 | { | |
676 | struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf; | |
677 | static unsigned int oops_count = 0; | |
678 | static bool panicking = false; | |
679 | static DEFINE_SPINLOCK(lock); | |
680 | unsigned long flags; | |
681 | size_t text_len; | |
682 | unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ; | |
683 | int rc = -1; | |
684 | ||
685 | switch (reason) { | |
686 | case KMSG_DUMP_RESTART: | |
687 | case KMSG_DUMP_HALT: | |
688 | case KMSG_DUMP_POWEROFF: | |
689 | /* These are almost always orderly shutdowns. */ | |
690 | return; | |
691 | case KMSG_DUMP_OOPS: | |
692 | break; | |
693 | case KMSG_DUMP_PANIC: | |
694 | panicking = true; | |
695 | break; | |
696 | case KMSG_DUMP_EMERG: | |
697 | if (panicking) | |
698 | /* Panic report already captured. */ | |
699 | return; | |
700 | break; | |
701 | default: | |
702 | pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n", | |
703 | __func__, (int) reason); | |
704 | return; | |
705 | } | |
706 | ||
707 | if (clobbering_unread_rtas_event()) | |
708 | return; | |
709 | ||
710 | if (!spin_trylock_irqsave(&lock, flags)) | |
711 | return; | |
712 | ||
713 | if (big_oops_buf) { | |
714 | kmsg_dump_get_buffer(dumper, false, | |
715 | big_oops_buf, big_oops_buf_sz, &text_len); | |
716 | rc = zip_oops(text_len); | |
717 | } | |
718 | if (rc != 0) { | |
719 | kmsg_dump_rewind(dumper); | |
720 | kmsg_dump_get_buffer(dumper, false, | |
721 | oops_data, oops_data_sz, &text_len); | |
722 | err_type = ERR_TYPE_KERNEL_PANIC; | |
723 | oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); | |
724 | oops_hdr->report_length = cpu_to_be16(text_len); | |
e4a9616c | 725 | oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); |
78989f0a HB |
726 | } |
727 | ||
728 | (void) nvram_write_os_partition(&oops_log_partition, oops_buf, | |
729 | (int) (sizeof(*oops_hdr) + text_len), err_type, | |
730 | ++oops_count); | |
731 | ||
732 | spin_unlock_irqrestore(&lock, flags); | |
733 | } | |
734 | ||
1da177e4 LT |
735 | static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) |
736 | { | |
1da177e4 LT |
737 | if (ppc_md.nvram_size == NULL) |
738 | return -ENODEV; | |
b808b1d6 AV |
739 | return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE, |
740 | ppc_md.nvram_size()); | |
1da177e4 LT |
741 | } |
742 | ||
743 | ||
744 | static ssize_t dev_nvram_read(struct file *file, char __user *buf, | |
745 | size_t count, loff_t *ppos) | |
746 | { | |
f9ce299f AB |
747 | ssize_t ret; |
748 | char *tmp = NULL; | |
749 | ssize_t size; | |
1da177e4 | 750 | |
7029705a CG |
751 | if (!ppc_md.nvram_size) { |
752 | ret = -ENODEV; | |
f9ce299f | 753 | goto out; |
7029705a | 754 | } |
f9ce299f | 755 | |
1da177e4 | 756 | size = ppc_md.nvram_size(); |
7029705a CG |
757 | if (size < 0) { |
758 | ret = size; | |
f9ce299f | 759 | goto out; |
7029705a CG |
760 | } |
761 | ||
762 | if (*ppos >= size) { | |
763 | ret = 0; | |
764 | goto out; | |
765 | } | |
1da177e4 | 766 | |
f9ce299f AB |
767 | count = min_t(size_t, count, size - *ppos); |
768 | count = min(count, PAGE_SIZE); | |
1da177e4 | 769 | |
f9ce299f | 770 | tmp = kmalloc(count, GFP_KERNEL); |
7029705a CG |
771 | if (!tmp) { |
772 | ret = -ENOMEM; | |
f9ce299f | 773 | goto out; |
7029705a | 774 | } |
1da177e4 | 775 | |
f9ce299f AB |
776 | ret = ppc_md.nvram_read(tmp, count, ppos); |
777 | if (ret <= 0) | |
778 | goto out; | |
779 | ||
780 | if (copy_to_user(buf, tmp, ret)) | |
781 | ret = -EFAULT; | |
1da177e4 | 782 | |
f9ce299f AB |
783 | out: |
784 | kfree(tmp); | |
785 | return ret; | |
1da177e4 LT |
786 | |
787 | } | |
788 | ||
789 | static ssize_t dev_nvram_write(struct file *file, const char __user *buf, | |
f9ce299f | 790 | size_t count, loff_t *ppos) |
1da177e4 | 791 | { |
f9ce299f AB |
792 | ssize_t ret; |
793 | char *tmp = NULL; | |
794 | ssize_t size; | |
1da177e4 | 795 | |
f9ce299f AB |
796 | ret = -ENODEV; |
797 | if (!ppc_md.nvram_size) | |
798 | goto out; | |
799 | ||
800 | ret = 0; | |
1da177e4 | 801 | size = ppc_md.nvram_size(); |
f9ce299f AB |
802 | if (*ppos >= size || size < 0) |
803 | goto out; | |
1da177e4 | 804 | |
f9ce299f AB |
805 | count = min_t(size_t, count, size - *ppos); |
806 | count = min(count, PAGE_SIZE); | |
1da177e4 | 807 | |
f9ce299f AB |
808 | ret = -ENOMEM; |
809 | tmp = kmalloc(count, GFP_KERNEL); | |
810 | if (!tmp) | |
811 | goto out; | |
812 | ||
813 | ret = -EFAULT; | |
814 | if (copy_from_user(tmp, buf, count)) | |
815 | goto out; | |
816 | ||
817 | ret = ppc_md.nvram_write(tmp, count, ppos); | |
818 | ||
819 | out: | |
820 | kfree(tmp); | |
821 | return ret; | |
1da177e4 | 822 | |
1da177e4 LT |
823 | } |
824 | ||
3b03fecd TG |
825 | static long dev_nvram_ioctl(struct file *file, unsigned int cmd, |
826 | unsigned long arg) | |
1da177e4 LT |
827 | { |
828 | switch(cmd) { | |
829 | #ifdef CONFIG_PPC_PMAC | |
830 | case OBSOLETE_PMAC_NVRAM_GET_OFFSET: | |
831 | printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); | |
832 | case IOC_NVRAM_GET_OFFSET: { | |
833 | int part, offset; | |
834 | ||
e8222502 | 835 | if (!machine_is(powermac)) |
1da177e4 LT |
836 | return -EINVAL; |
837 | if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0) | |
838 | return -EFAULT; | |
839 | if (part < pmac_nvram_OF || part > pmac_nvram_NR) | |
840 | return -EINVAL; | |
841 | offset = pmac_get_partition(part); | |
842 | if (offset < 0) | |
843 | return offset; | |
844 | if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) | |
845 | return -EFAULT; | |
846 | return 0; | |
847 | } | |
848 | #endif /* CONFIG_PPC_PMAC */ | |
af308377 SR |
849 | default: |
850 | return -EINVAL; | |
1da177e4 | 851 | } |
1da177e4 LT |
852 | } |
853 | ||
5dfe4c96 | 854 | const struct file_operations nvram_fops = { |
3b03fecd TG |
855 | .owner = THIS_MODULE, |
856 | .llseek = dev_nvram_llseek, | |
857 | .read = dev_nvram_read, | |
858 | .write = dev_nvram_write, | |
859 | .unlocked_ioctl = dev_nvram_ioctl, | |
1da177e4 LT |
860 | }; |
861 | ||
862 | static struct miscdevice nvram_dev = { | |
863 | NVRAM_MINOR, | |
864 | "nvram", | |
865 | &nvram_fops | |
866 | }; | |
867 | ||
868 | ||
869 | #ifdef DEBUG_NVRAM | |
32c105c3 | 870 | static void __init nvram_print_partitions(char * label) |
1da177e4 | 871 | { |
1da177e4 LT |
872 | struct nvram_partition * tmp_part; |
873 | ||
874 | printk(KERN_WARNING "--------%s---------\n", label); | |
875 | printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); | |
690d1a9b | 876 | list_for_each_entry(tmp_part, &nvram_partitions, partition) { |
e0513d9e | 877 | printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12.12s\n", |
1da177e4 LT |
878 | tmp_part->index, tmp_part->header.signature, |
879 | tmp_part->header.checksum, tmp_part->header.length, | |
880 | tmp_part->header.name); | |
881 | } | |
882 | } | |
883 | #endif | |
884 | ||
885 | ||
32c105c3 | 886 | static int __init nvram_write_header(struct nvram_partition * part) |
1da177e4 LT |
887 | { |
888 | loff_t tmp_index; | |
889 | int rc; | |
c81095a4 CLG |
890 | struct nvram_header phead; |
891 | ||
892 | memcpy(&phead, &part->header, NVRAM_HEADER_LEN); | |
893 | phead.length = cpu_to_be16(phead.length); | |
894 | ||
1da177e4 | 895 | tmp_index = part->index; |
c81095a4 | 896 | rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index); |
1da177e4 LT |
897 | |
898 | return rc; | |
899 | } | |
900 | ||
901 | ||
32c105c3 | 902 | static unsigned char __init nvram_checksum(struct nvram_header *p) |
1da177e4 LT |
903 | { |
904 | unsigned int c_sum, c_sum2; | |
905 | unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ | |
906 | c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; | |
907 | ||
908 | /* The sum may have spilled into the 3rd byte. Fold it back. */ | |
909 | c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; | |
910 | /* The sum cannot exceed 2 bytes. Fold it into a checksum */ | |
911 | c_sum2 = (c_sum >> 8) + (c_sum << 8); | |
912 | c_sum = ((c_sum + c_sum2) >> 8) & 0xff; | |
913 | return c_sum; | |
914 | } | |
915 | ||
0f4ac132 JK |
916 | /* |
917 | * Per the criteria passed via nvram_remove_partition(), should this | |
918 | * partition be removed? 1=remove, 0=keep | |
919 | */ | |
920 | static int nvram_can_remove_partition(struct nvram_partition *part, | |
921 | const char *name, int sig, const char *exceptions[]) | |
922 | { | |
923 | if (part->header.signature != sig) | |
924 | return 0; | |
925 | if (name) { | |
926 | if (strncmp(name, part->header.name, 12)) | |
927 | return 0; | |
928 | } else if (exceptions) { | |
929 | const char **except; | |
930 | for (except = exceptions; *except; except++) { | |
931 | if (!strncmp(*except, part->header.name, 12)) | |
932 | return 0; | |
933 | } | |
934 | } | |
935 | return 1; | |
936 | } | |
937 | ||
fa2b4e54 BH |
938 | /** |
939 | * nvram_remove_partition - Remove one or more partitions in nvram | |
940 | * @name: name of the partition to remove, or NULL for a | |
941 | * signature only match | |
942 | * @sig: signature of the partition(s) to remove | |
0f4ac132 JK |
943 | * @exceptions: When removing all partitions with a matching signature, |
944 | * leave these alone. | |
fa2b4e54 BH |
945 | */ |
946 | ||
0f4ac132 JK |
947 | int __init nvram_remove_partition(const char *name, int sig, |
948 | const char *exceptions[]) | |
1da177e4 | 949 | { |
fa2b4e54 | 950 | struct nvram_partition *part, *prev, *tmp; |
1da177e4 LT |
951 | int rc; |
952 | ||
690d1a9b | 953 | list_for_each_entry(part, &nvram_partitions, partition) { |
0f4ac132 | 954 | if (!nvram_can_remove_partition(part, name, sig, exceptions)) |
fa2b4e54 BH |
955 | continue; |
956 | ||
957 | /* Make partition a free partition */ | |
1da177e4 | 958 | part->header.signature = NVRAM_SIG_FREE; |
6024ede9 | 959 | strncpy(part->header.name, "wwwwwwwwwwww", 12); |
1da177e4 | 960 | part->header.checksum = nvram_checksum(&part->header); |
1da177e4 LT |
961 | rc = nvram_write_header(part); |
962 | if (rc <= 0) { | |
fa2b4e54 | 963 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); |
1da177e4 LT |
964 | return rc; |
965 | } | |
fa2b4e54 | 966 | } |
1da177e4 | 967 | |
fa2b4e54 BH |
968 | /* Merge contiguous ones */ |
969 | prev = NULL; | |
690d1a9b | 970 | list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) { |
fa2b4e54 BH |
971 | if (part->header.signature != NVRAM_SIG_FREE) { |
972 | prev = NULL; | |
973 | continue; | |
974 | } | |
975 | if (prev) { | |
976 | prev->header.length += part->header.length; | |
977 | prev->header.checksum = nvram_checksum(&part->header); | |
978 | rc = nvram_write_header(part); | |
979 | if (rc <= 0) { | |
980 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); | |
981 | return rc; | |
982 | } | |
983 | list_del(&part->partition); | |
984 | kfree(part); | |
985 | } else | |
986 | prev = part; | |
1da177e4 LT |
987 | } |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
4e7c77a3 BH |
992 | /** |
993 | * nvram_create_partition - Create a partition in nvram | |
994 | * @name: name of the partition to create | |
995 | * @sig: signature of the partition to create | |
36673307 | 996 | * @req_size: size of data to allocate in bytes |
4e7c77a3 | 997 | * @min_size: minimum acceptable size (0 means req_size) |
e49e2e87 BH |
998 | * |
999 | * Returns a negative error code or a positive nvram index | |
1000 | * of the beginning of the data area of the newly created | |
1001 | * partition. If you provided a min_size smaller than req_size | |
1002 | * you need to query for the actual size yourself after the | |
1003 | * call using nvram_partition_get_size(). | |
1da177e4 | 1004 | */ |
edc79a2f BH |
1005 | loff_t __init nvram_create_partition(const char *name, int sig, |
1006 | int req_size, int min_size) | |
1da177e4 | 1007 | { |
a341ad97 AB |
1008 | struct nvram_partition *part; |
1009 | struct nvram_partition *new_part; | |
0339ad77 | 1010 | struct nvram_partition *free_part = NULL; |
cef0d5ad | 1011 | static char nv_init_vals[16]; |
1da177e4 LT |
1012 | loff_t tmp_index; |
1013 | long size = 0; | |
1014 | int rc; | |
4e7c77a3 | 1015 | |
36673307 BH |
1016 | /* Convert sizes from bytes to blocks */ |
1017 | req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; | |
1018 | min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; | |
1019 | ||
4e7c77a3 BH |
1020 | /* If no minimum size specified, make it the same as the |
1021 | * requested size | |
1022 | */ | |
1023 | if (min_size == 0) | |
1024 | min_size = req_size; | |
e49e2e87 BH |
1025 | if (min_size > req_size) |
1026 | return -EINVAL; | |
4e7c77a3 | 1027 | |
36673307 BH |
1028 | /* Now add one block to each for the header */ |
1029 | req_size += 1; | |
1030 | min_size += 1; | |
1031 | ||
1da177e4 LT |
1032 | /* Find a free partition that will give us the maximum needed size |
1033 | If can't find one that will give us the minimum size needed */ | |
690d1a9b | 1034 | list_for_each_entry(part, &nvram_partitions, partition) { |
1da177e4 LT |
1035 | if (part->header.signature != NVRAM_SIG_FREE) |
1036 | continue; | |
1037 | ||
4e7c77a3 BH |
1038 | if (part->header.length >= req_size) { |
1039 | size = req_size; | |
1da177e4 LT |
1040 | free_part = part; |
1041 | break; | |
1042 | } | |
4e7c77a3 BH |
1043 | if (part->header.length > size && |
1044 | part->header.length >= min_size) { | |
1045 | size = part->header.length; | |
1da177e4 LT |
1046 | free_part = part; |
1047 | } | |
1048 | } | |
0339ad77 | 1049 | if (!size) |
1da177e4 | 1050 | return -ENOSPC; |
1da177e4 LT |
1051 | |
1052 | /* Create our OS partition */ | |
0339ad77 | 1053 | new_part = kmalloc(sizeof(*new_part), GFP_KERNEL); |
1da177e4 | 1054 | if (!new_part) { |
b6080db4 | 1055 | pr_err("%s: kmalloc failed\n", __func__); |
1da177e4 LT |
1056 | return -ENOMEM; |
1057 | } | |
1058 | ||
1059 | new_part->index = free_part->index; | |
4e7c77a3 | 1060 | new_part->header.signature = sig; |
1da177e4 | 1061 | new_part->header.length = size; |
4e7c77a3 | 1062 | strncpy(new_part->header.name, name, 12); |
1da177e4 LT |
1063 | new_part->header.checksum = nvram_checksum(&new_part->header); |
1064 | ||
1065 | rc = nvram_write_header(new_part); | |
1066 | if (rc <= 0) { | |
b6080db4 | 1067 | pr_err("%s: nvram_write_header failed (%d)\n", __func__, rc); |
7d523187 | 1068 | kfree(new_part); |
1da177e4 LT |
1069 | return rc; |
1070 | } | |
e49e2e87 BH |
1071 | list_add_tail(&new_part->partition, &free_part->partition); |
1072 | ||
1073 | /* Adjust or remove the partition we stole the space from */ | |
1074 | if (free_part->header.length > size) { | |
1075 | free_part->index += size * NVRAM_BLOCK_LEN; | |
1076 | free_part->header.length -= size; | |
1077 | free_part->header.checksum = nvram_checksum(&free_part->header); | |
1078 | rc = nvram_write_header(free_part); | |
1079 | if (rc <= 0) { | |
b6080db4 CJ |
1080 | pr_err("%s: nvram_write_header failed (%d)\n", |
1081 | __func__, rc); | |
e49e2e87 BH |
1082 | return rc; |
1083 | } | |
1084 | } else { | |
1085 | list_del(&free_part->partition); | |
1086 | kfree(free_part); | |
1087 | } | |
1da177e4 | 1088 | |
e49e2e87 | 1089 | /* Clear the new partition */ |
cef0d5ad BH |
1090 | for (tmp_index = new_part->index + NVRAM_HEADER_LEN; |
1091 | tmp_index < ((size - 1) * NVRAM_BLOCK_LEN); | |
1092 | tmp_index += NVRAM_BLOCK_LEN) { | |
1093 | rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index); | |
1094 | if (rc <= 0) { | |
b6080db4 CJ |
1095 | pr_err("%s: nvram_write failed (%d)\n", |
1096 | __func__, rc); | |
cef0d5ad BH |
1097 | return rc; |
1098 | } | |
1da177e4 | 1099 | } |
b6080db4 | 1100 | |
e49e2e87 BH |
1101 | return new_part->index + NVRAM_HEADER_LEN; |
1102 | } | |
1da177e4 | 1103 | |
e49e2e87 BH |
1104 | /** |
1105 | * nvram_get_partition_size - Get the data size of an nvram partition | |
1106 | * @data_index: This is the offset of the start of the data of | |
1107 | * the partition. The same value that is returned by | |
1108 | * nvram_create_partition(). | |
1109 | */ | |
edc79a2f | 1110 | int nvram_get_partition_size(loff_t data_index) |
e49e2e87 BH |
1111 | { |
1112 | struct nvram_partition *part; | |
1da177e4 | 1113 | |
690d1a9b | 1114 | list_for_each_entry(part, &nvram_partitions, partition) { |
e49e2e87 BH |
1115 | if (part->index + NVRAM_HEADER_LEN == data_index) |
1116 | return (part->header.length - 1) * NVRAM_BLOCK_LEN; | |
1da177e4 | 1117 | } |
e49e2e87 | 1118 | return -1; |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | ||
cf5cbf9f BH |
1122 | /** |
1123 | * nvram_find_partition - Find an nvram partition by signature and name | |
1124 | * @name: Name of the partition or NULL for any name | |
1125 | * @sig: Signature to test against | |
1126 | * @out_size: if non-NULL, returns the size of the data part of the partition | |
1127 | */ | |
1128 | loff_t nvram_find_partition(const char *name, int sig, int *out_size) | |
1129 | { | |
1130 | struct nvram_partition *p; | |
1131 | ||
690d1a9b | 1132 | list_for_each_entry(p, &nvram_partitions, partition) { |
cf5cbf9f BH |
1133 | if (p->header.signature == sig && |
1134 | (!name || !strncmp(p->header.name, name, 12))) { | |
1135 | if (out_size) | |
1136 | *out_size = (p->header.length - 1) * | |
1137 | NVRAM_BLOCK_LEN; | |
1138 | return p->index + NVRAM_HEADER_LEN; | |
1139 | } | |
1140 | } | |
1141 | return 0; | |
1142 | } | |
1143 | ||
edc79a2f | 1144 | int __init nvram_scan_partitions(void) |
1da177e4 LT |
1145 | { |
1146 | loff_t cur_index = 0; | |
1147 | struct nvram_header phead; | |
1148 | struct nvram_partition * tmp_part; | |
1149 | unsigned char c_sum; | |
1150 | char * header; | |
1151 | int total_size; | |
1152 | int err; | |
1153 | ||
edc79a2f | 1154 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
1da177e4 LT |
1155 | return -ENODEV; |
1156 | total_size = ppc_md.nvram_size(); | |
1157 | ||
5cbded58 | 1158 | header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); |
1da177e4 LT |
1159 | if (!header) { |
1160 | printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); | |
1161 | return -ENOMEM; | |
1162 | } | |
1163 | ||
1164 | while (cur_index < total_size) { | |
1165 | ||
1166 | err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); | |
1167 | if (err != NVRAM_HEADER_LEN) { | |
1168 | printk(KERN_ERR "nvram_scan_partitions: Error parsing " | |
1169 | "nvram partitions\n"); | |
1170 | goto out; | |
1171 | } | |
1172 | ||
1173 | cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ | |
1174 | ||
1175 | memcpy(&phead, header, NVRAM_HEADER_LEN); | |
1176 | ||
c81095a4 CLG |
1177 | phead.length = be16_to_cpu(phead.length); |
1178 | ||
1da177e4 LT |
1179 | err = 0; |
1180 | c_sum = nvram_checksum(&phead); | |
1181 | if (c_sum != phead.checksum) { | |
1182 | printk(KERN_WARNING "WARNING: nvram partition checksum" | |
1183 | " was %02x, should be %02x!\n", | |
1184 | phead.checksum, c_sum); | |
1185 | printk(KERN_WARNING "Terminating nvram partition scan\n"); | |
1186 | goto out; | |
1187 | } | |
1188 | if (!phead.length) { | |
1189 | printk(KERN_WARNING "WARNING: nvram corruption " | |
1190 | "detected: 0-length partition\n"); | |
1191 | goto out; | |
1192 | } | |
6e51c9ff | 1193 | tmp_part = kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); |
1da177e4 LT |
1194 | err = -ENOMEM; |
1195 | if (!tmp_part) { | |
1196 | printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); | |
1197 | goto out; | |
1198 | } | |
1199 | ||
1200 | memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); | |
1201 | tmp_part->index = cur_index; | |
690d1a9b | 1202 | list_add_tail(&tmp_part->partition, &nvram_partitions); |
1da177e4 LT |
1203 | |
1204 | cur_index += phead.length * NVRAM_BLOCK_LEN; | |
1205 | } | |
1206 | err = 0; | |
1207 | ||
edc79a2f BH |
1208 | #ifdef DEBUG_NVRAM |
1209 | nvram_print_partitions("NVRAM Partitions"); | |
1210 | #endif | |
1211 | ||
1da177e4 LT |
1212 | out: |
1213 | kfree(header); | |
1214 | return err; | |
1215 | } | |
1216 | ||
1217 | static int __init nvram_init(void) | |
1218 | { | |
1da177e4 LT |
1219 | int rc; |
1220 | ||
578914cf BH |
1221 | BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); |
1222 | ||
1da177e4 LT |
1223 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
1224 | return -ENODEV; | |
1225 | ||
1226 | rc = misc_register(&nvram_dev); | |
1227 | if (rc != 0) { | |
1228 | printk(KERN_ERR "nvram_init: failed to register device\n"); | |
1229 | return rc; | |
1230 | } | |
1231 | ||
1da177e4 LT |
1232 | return rc; |
1233 | } | |
1234 | ||
e51df2c1 | 1235 | static void __exit nvram_cleanup(void) |
1da177e4 LT |
1236 | { |
1237 | misc_deregister( &nvram_dev ); | |
1238 | } | |
1239 | ||
1da177e4 LT |
1240 | module_init(nvram_init); |
1241 | module_exit(nvram_cleanup); | |
1242 | MODULE_LICENSE("GPL"); |