Commit | Line | Data |
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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 | * | |
188917e1 | 9 | * /proc/powerpc/rtas/firmware_flash interface |
1da177e4 LT |
10 | * |
11 | * This file implements a firmware_flash interface to pump a firmware | |
12 | * image into the kernel. At reboot time rtas_restart() will see the | |
13 | * firmware image and flash it as it reboots (see rtas.c). | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/proc_fs.h> |
c5f41752 | 20 | #include <linux/reboot.h> |
1da177e4 LT |
21 | #include <asm/delay.h> |
22 | #include <asm/uaccess.h> | |
23 | #include <asm/rtas.h> | |
24 | ||
25 | #define MODULE_VERS "1.0" | |
26 | #define MODULE_NAME "rtas_flash" | |
27 | ||
28 | #define FIRMWARE_FLASH_NAME "firmware_flash" | |
29 | #define FIRMWARE_UPDATE_NAME "firmware_update" | |
30 | #define MANAGE_FLASH_NAME "manage_flash" | |
31 | #define VALIDATE_FLASH_NAME "validate_flash" | |
32 | ||
33 | /* General RTAS Status Codes */ | |
34 | #define RTAS_RC_SUCCESS 0 | |
35 | #define RTAS_RC_HW_ERR -1 | |
36 | #define RTAS_RC_BUSY -2 | |
37 | ||
38 | /* Flash image status values */ | |
39 | #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
40 | #define FLASH_NO_OP -1099 /* No operation initiated by user */ | |
41 | #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ | |
42 | #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ | |
43 | #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ | |
44 | #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ | |
45 | ||
46 | /* Manage image status values */ | |
47 | #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
48 | #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ | |
49 | #define MANAGE_NO_OP -1099 /* No operation initiated by user */ | |
50 | #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
51 | #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ | |
52 | ||
53 | /* Validate image status values */ | |
54 | #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
55 | #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ | |
56 | #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ | |
57 | #define VALIDATE_READY -1001 /* Firmware image ready for validation */ | |
58 | #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
59 | #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ | |
f51005d7 VH |
60 | |
61 | /* ibm,validate-flash-image update result tokens */ | |
62 | #define VALIDATE_TMP_UPDATE 0 /* T side will be updated */ | |
63 | #define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */ | |
64 | #define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */ | |
65 | #define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */ | |
66 | /* | |
67 | * Current T side will be committed to P side before being replace with new | |
68 | * image, and the new image is downlevel from current image | |
69 | */ | |
70 | #define VALIDATE_TMP_COMMIT_DL 4 | |
71 | /* | |
72 | * Current T side will be committed to P side before being replaced with new | |
73 | * image | |
74 | */ | |
75 | #define VALIDATE_TMP_COMMIT 5 | |
76 | /* | |
77 | * T side will be updated with a downlevel image | |
78 | */ | |
79 | #define VALIDATE_TMP_UPDATE_DL 6 | |
fd2d37c8 VH |
80 | /* |
81 | * The candidate image's release date is later than the system's firmware | |
82 | * service entitlement date - service warranty period has expired | |
83 | */ | |
84 | #define VALIDATE_OUT_OF_WRNTY 7 | |
1da177e4 LT |
85 | |
86 | /* ibm,manage-flash-image operation tokens */ | |
87 | #define RTAS_REJECT_TMP_IMG 0 | |
88 | #define RTAS_COMMIT_TMP_IMG 1 | |
89 | ||
90 | /* Array sizes */ | |
91 | #define VALIDATE_BUF_SIZE 4096 | |
a94a1472 | 92 | #define VALIDATE_MSG_LEN 256 |
1da177e4 LT |
93 | #define RTAS_MSG_MAXLEN 64 |
94 | ||
ae883cab JR |
95 | /* Quirk - RTAS requires 4k list length and block size */ |
96 | #define RTAS_BLKLIST_LENGTH 4096 | |
97 | #define RTAS_BLK_SIZE 4096 | |
98 | ||
f4fcbbe9 PM |
99 | struct flash_block { |
100 | char *data; | |
101 | unsigned long length; | |
102 | }; | |
103 | ||
104 | /* This struct is very similar but not identical to | |
105 | * that needed by the rtas flash update. | |
106 | * All we need to do for rtas is rewrite num_blocks | |
107 | * into a version/length and translate the pointers | |
108 | * to absolute. | |
109 | */ | |
ae883cab | 110 | #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) |
f4fcbbe9 PM |
111 | struct flash_block_list { |
112 | unsigned long num_blocks; | |
113 | struct flash_block_list *next; | |
114 | struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; | |
115 | }; | |
f4fcbbe9 | 116 | |
bd2b64a1 | 117 | static struct flash_block_list *rtas_firmware_flash_list; |
f4fcbbe9 | 118 | |
ae883cab | 119 | /* Use slab cache to guarantee 4k alignment */ |
e18b890b | 120 | static struct kmem_cache *flash_block_cache = NULL; |
ae883cab | 121 | |
f4fcbbe9 PM |
122 | #define FLASH_BLOCK_LIST_VERSION (1UL) |
123 | ||
e8eeded3 DH |
124 | /* |
125 | * Local copy of the flash block list. | |
126 | * | |
127 | * The rtas_firmware_flash_list varable will be | |
bd2b64a1 | 128 | * set once the data is fully read. |
1da177e4 LT |
129 | * |
130 | * For convenience as we build the list we use virtual addrs, | |
131 | * we do not fill in the version number, and the length field | |
132 | * is treated as the number of entries currently in the block | |
bd2b64a1 MM |
133 | * (i.e. not a byte count). This is all fixed when calling |
134 | * the flash routine. | |
1da177e4 LT |
135 | */ |
136 | ||
137 | /* Status int must be first member of struct */ | |
138 | struct rtas_update_flash_t | |
139 | { | |
140 | int status; /* Flash update status */ | |
141 | struct flash_block_list *flist; /* Local copy of flash block list */ | |
142 | }; | |
143 | ||
144 | /* Status int must be first member of struct */ | |
145 | struct rtas_manage_flash_t | |
146 | { | |
147 | int status; /* Returned status */ | |
1da177e4 LT |
148 | }; |
149 | ||
150 | /* Status int must be first member of struct */ | |
151 | struct rtas_validate_flash_t | |
152 | { | |
153 | int status; /* Returned status */ | |
e8eeded3 | 154 | char *buf; /* Candidate image buffer */ |
1da177e4 LT |
155 | unsigned int buf_size; /* Size of image buf */ |
156 | unsigned int update_results; /* Update results token */ | |
157 | }; | |
158 | ||
e8eeded3 DH |
159 | static struct rtas_update_flash_t rtas_update_flash_data; |
160 | static struct rtas_manage_flash_t rtas_manage_flash_data; | |
161 | static struct rtas_validate_flash_t rtas_validate_flash_data; | |
162 | static DEFINE_MUTEX(rtas_update_flash_mutex); | |
163 | static DEFINE_MUTEX(rtas_manage_flash_mutex); | |
164 | static DEFINE_MUTEX(rtas_validate_flash_mutex); | |
1da177e4 LT |
165 | |
166 | /* Do simple sanity checks on the flash image. */ | |
167 | static int flash_list_valid(struct flash_block_list *flist) | |
168 | { | |
169 | struct flash_block_list *f; | |
170 | int i; | |
171 | unsigned long block_size, image_size; | |
172 | ||
173 | /* Paranoid self test here. We also collect the image size. */ | |
174 | image_size = 0; | |
175 | for (f = flist; f; f = f->next) { | |
176 | for (i = 0; i < f->num_blocks; i++) { | |
177 | if (f->blocks[i].data == NULL) { | |
178 | return FLASH_IMG_NULL_DATA; | |
179 | } | |
180 | block_size = f->blocks[i].length; | |
ae883cab | 181 | if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { |
1da177e4 LT |
182 | return FLASH_IMG_BAD_LEN; |
183 | } | |
184 | image_size += block_size; | |
185 | } | |
186 | } | |
187 | ||
188 | if (image_size < (256 << 10)) { | |
189 | if (image_size < 2) | |
190 | return FLASH_NO_OP; | |
191 | } | |
192 | ||
193 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); | |
194 | ||
195 | return FLASH_IMG_READY; | |
196 | } | |
197 | ||
198 | static void free_flash_list(struct flash_block_list *f) | |
199 | { | |
200 | struct flash_block_list *next; | |
201 | int i; | |
202 | ||
203 | while (f) { | |
204 | for (i = 0; i < f->num_blocks; i++) | |
ae883cab | 205 | kmem_cache_free(flash_block_cache, f->blocks[i].data); |
1da177e4 | 206 | next = f->next; |
ae883cab | 207 | kmem_cache_free(flash_block_cache, f); |
1da177e4 LT |
208 | f = next; |
209 | } | |
210 | } | |
211 | ||
212 | static int rtas_flash_release(struct inode *inode, struct file *file) | |
213 | { | |
e8eeded3 DH |
214 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
215 | ||
216 | mutex_lock(&rtas_update_flash_mutex); | |
217 | ||
1da177e4 LT |
218 | if (uf->flist) { |
219 | /* File was opened in write mode for a new flash attempt */ | |
220 | /* Clear saved list */ | |
bd2b64a1 MM |
221 | if (rtas_firmware_flash_list) { |
222 | free_flash_list(rtas_firmware_flash_list); | |
223 | rtas_firmware_flash_list = NULL; | |
1da177e4 LT |
224 | } |
225 | ||
226 | if (uf->status != FLASH_AUTH) | |
227 | uf->status = flash_list_valid(uf->flist); | |
228 | ||
229 | if (uf->status == FLASH_IMG_READY) | |
bd2b64a1 | 230 | rtas_firmware_flash_list = uf->flist; |
1da177e4 LT |
231 | else |
232 | free_flash_list(uf->flist); | |
233 | ||
234 | uf->flist = NULL; | |
235 | } | |
236 | ||
e8eeded3 | 237 | mutex_unlock(&rtas_update_flash_mutex); |
1da177e4 LT |
238 | return 0; |
239 | } | |
240 | ||
e8eeded3 | 241 | static size_t get_flash_status_msg(int status, char *buf) |
1da177e4 | 242 | { |
e8eeded3 DH |
243 | const char *msg; |
244 | size_t len; | |
1da177e4 LT |
245 | |
246 | switch (status) { | |
247 | case FLASH_AUTH: | |
248 | msg = "error: this partition does not have service authority\n"; | |
249 | break; | |
250 | case FLASH_NO_OP: | |
251 | msg = "info: no firmware image for flash\n"; | |
252 | break; | |
253 | case FLASH_IMG_SHORT: | |
254 | msg = "error: flash image short\n"; | |
255 | break; | |
256 | case FLASH_IMG_BAD_LEN: | |
257 | msg = "error: internal error bad length\n"; | |
258 | break; | |
259 | case FLASH_IMG_NULL_DATA: | |
260 | msg = "error: internal error null data\n"; | |
261 | break; | |
262 | case FLASH_IMG_READY: | |
263 | msg = "ready: firmware image ready for flash on reboot\n"; | |
264 | break; | |
265 | default: | |
e8eeded3 DH |
266 | return sprintf(buf, "error: unexpected status value %d\n", |
267 | status); | |
1da177e4 LT |
268 | } |
269 | ||
e8eeded3 DH |
270 | len = strlen(msg); |
271 | memcpy(buf, msg, len + 1); | |
272 | return len; | |
1da177e4 LT |
273 | } |
274 | ||
275 | /* Reading the proc file will show status (not the firmware contents) */ | |
e8eeded3 DH |
276 | static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf, |
277 | size_t count, loff_t *ppos) | |
1da177e4 | 278 | { |
e8eeded3 | 279 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
1da177e4 | 280 | char msg[RTAS_MSG_MAXLEN]; |
e8eeded3 DH |
281 | size_t len; |
282 | int status; | |
1da177e4 | 283 | |
e8eeded3 DH |
284 | mutex_lock(&rtas_update_flash_mutex); |
285 | status = uf->status; | |
286 | mutex_unlock(&rtas_update_flash_mutex); | |
1da177e4 | 287 | |
e8eeded3 DH |
288 | /* Read as text message */ |
289 | len = get_flash_status_msg(status, msg); | |
290 | return simple_read_from_buffer(buf, count, ppos, msg, len); | |
291 | } | |
292 | ||
293 | static ssize_t rtas_flash_read_num(struct file *file, char __user *buf, | |
294 | size_t count, loff_t *ppos) | |
295 | { | |
296 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; | |
297 | char msg[RTAS_MSG_MAXLEN]; | |
298 | int status; | |
1da177e4 | 299 | |
e8eeded3 DH |
300 | mutex_lock(&rtas_update_flash_mutex); |
301 | status = uf->status; | |
302 | mutex_unlock(&rtas_update_flash_mutex); | |
303 | ||
304 | /* Read as number */ | |
305 | sprintf(msg, "%d\n", status); | |
4c4a5cf6 | 306 | return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg)); |
1da177e4 LT |
307 | } |
308 | ||
309 | /* We could be much more efficient here. But to keep this function | |
310 | * simple we allocate a page to the block list no matter how small the | |
311 | * count is. If the system is low on memory it will be just as well | |
312 | * that we fail.... | |
313 | */ | |
efa54579 | 314 | static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
315 | size_t count, loff_t *off) |
316 | { | |
e8eeded3 | 317 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
1da177e4 | 318 | char *p; |
e8eeded3 | 319 | int next_free, rc; |
1da177e4 LT |
320 | struct flash_block_list *fl; |
321 | ||
e8eeded3 | 322 | mutex_lock(&rtas_update_flash_mutex); |
1da177e4 LT |
323 | |
324 | if (uf->status == FLASH_AUTH || count == 0) | |
e8eeded3 | 325 | goto out; /* discard data */ |
1da177e4 LT |
326 | |
327 | /* In the case that the image is not ready for flashing, the memory | |
328 | * allocated for the block list will be freed upon the release of the | |
329 | * proc file | |
330 | */ | |
331 | if (uf->flist == NULL) { | |
fb4696c3 | 332 | uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); |
1da177e4 | 333 | if (!uf->flist) |
e8eeded3 | 334 | goto nomem; |
1da177e4 LT |
335 | } |
336 | ||
337 | fl = uf->flist; | |
338 | while (fl->next) | |
339 | fl = fl->next; /* seek to last block_list for append */ | |
340 | next_free = fl->num_blocks; | |
341 | if (next_free == FLASH_BLOCKS_PER_NODE) { | |
342 | /* Need to allocate another block_list */ | |
fb4696c3 | 343 | fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); |
1da177e4 | 344 | if (!fl->next) |
e8eeded3 | 345 | goto nomem; |
1da177e4 LT |
346 | fl = fl->next; |
347 | next_free = 0; | |
348 | } | |
349 | ||
ae883cab JR |
350 | if (count > RTAS_BLK_SIZE) |
351 | count = RTAS_BLK_SIZE; | |
fb4696c3 | 352 | p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); |
1da177e4 | 353 | if (!p) |
e8eeded3 | 354 | goto nomem; |
1da177e4 LT |
355 | |
356 | if(copy_from_user(p, buffer, count)) { | |
ae883cab | 357 | kmem_cache_free(flash_block_cache, p); |
e8eeded3 DH |
358 | rc = -EFAULT; |
359 | goto error; | |
1da177e4 LT |
360 | } |
361 | fl->blocks[next_free].data = p; | |
362 | fl->blocks[next_free].length = count; | |
363 | fl->num_blocks++; | |
e8eeded3 DH |
364 | out: |
365 | mutex_unlock(&rtas_update_flash_mutex); | |
1da177e4 | 366 | return count; |
1da177e4 | 367 | |
e8eeded3 DH |
368 | nomem: |
369 | rc = -ENOMEM; | |
370 | error: | |
371 | mutex_unlock(&rtas_update_flash_mutex); | |
372 | return rc; | |
1da177e4 LT |
373 | } |
374 | ||
e8eeded3 DH |
375 | /* |
376 | * Flash management routines. | |
377 | */ | |
378 | static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op) | |
1da177e4 | 379 | { |
1da177e4 LT |
380 | s32 rc; |
381 | ||
507279db | 382 | do { |
e8eeded3 DH |
383 | rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1, |
384 | NULL, op); | |
507279db | 385 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
386 | |
387 | args_buf->status = rc; | |
388 | } | |
389 | ||
efa54579 | 390 | static ssize_t manage_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
391 | size_t count, loff_t *ppos) |
392 | { | |
e8eeded3 | 393 | struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; |
1da177e4 | 394 | char msg[RTAS_MSG_MAXLEN]; |
e8eeded3 | 395 | int msglen, status; |
1da177e4 | 396 | |
e8eeded3 DH |
397 | mutex_lock(&rtas_manage_flash_mutex); |
398 | status = args_buf->status; | |
399 | mutex_unlock(&rtas_manage_flash_mutex); | |
1da177e4 | 400 | |
e8eeded3 | 401 | msglen = sprintf(msg, "%d\n", status); |
4c4a5cf6 | 402 | return simple_read_from_buffer(buf, count, ppos, msg, msglen); |
1da177e4 LT |
403 | } |
404 | ||
efa54579 | 405 | static ssize_t manage_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
406 | size_t count, loff_t *off) |
407 | { | |
e8eeded3 DH |
408 | struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; |
409 | static const char reject_str[] = "0"; | |
410 | static const char commit_str[] = "1"; | |
1da177e4 | 411 | char stkbuf[10]; |
e8eeded3 DH |
412 | int op, rc; |
413 | ||
414 | mutex_lock(&rtas_manage_flash_mutex); | |
1da177e4 | 415 | |
1da177e4 | 416 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) |
e8eeded3 | 417 | goto out; |
1da177e4 LT |
418 | |
419 | op = -1; | |
420 | if (buf) { | |
421 | if (count > 9) count = 9; | |
e8eeded3 DH |
422 | rc = -EFAULT; |
423 | if (copy_from_user (stkbuf, buf, count)) | |
424 | goto error; | |
1da177e4 LT |
425 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) |
426 | op = RTAS_REJECT_TMP_IMG; | |
427 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) | |
428 | op = RTAS_COMMIT_TMP_IMG; | |
429 | } | |
430 | ||
e8eeded3 DH |
431 | if (op == -1) { /* buf is empty, or contains invalid string */ |
432 | rc = -EINVAL; | |
433 | goto error; | |
434 | } | |
1da177e4 | 435 | |
e8eeded3 DH |
436 | manage_flash(args_buf, op); |
437 | out: | |
438 | mutex_unlock(&rtas_manage_flash_mutex); | |
1da177e4 | 439 | return count; |
e8eeded3 DH |
440 | |
441 | error: | |
442 | mutex_unlock(&rtas_manage_flash_mutex); | |
443 | return rc; | |
1da177e4 LT |
444 | } |
445 | ||
e8eeded3 DH |
446 | /* |
447 | * Validation routines. | |
448 | */ | |
1da177e4 LT |
449 | static void validate_flash(struct rtas_validate_flash_t *args_buf) |
450 | { | |
451 | int token = rtas_token("ibm,validate-flash-image"); | |
1da177e4 LT |
452 | int update_results; |
453 | s32 rc; | |
454 | ||
455 | rc = 0; | |
507279db | 456 | do { |
1da177e4 LT |
457 | spin_lock(&rtas_data_buf_lock); |
458 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); | |
459 | rc = rtas_call(token, 2, 2, &update_results, | |
460 | (u32) __pa(rtas_data_buf), args_buf->buf_size); | |
461 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); | |
462 | spin_unlock(&rtas_data_buf_lock); | |
507279db | 463 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
464 | |
465 | args_buf->status = rc; | |
466 | args_buf->update_results = update_results; | |
467 | } | |
468 | ||
469 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, | |
a94a1472 | 470 | char *msg, int msglen) |
1da177e4 LT |
471 | { |
472 | int n; | |
473 | ||
474 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { | |
475 | n = sprintf(msg, "%d\n", args_buf->update_results); | |
476 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || | |
477 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) | |
a94a1472 VH |
478 | n += snprintf(msg + n, msglen - n, "%s\n", |
479 | args_buf->buf); | |
1da177e4 LT |
480 | } else { |
481 | n = sprintf(msg, "%d\n", args_buf->status); | |
482 | } | |
483 | return n; | |
484 | } | |
485 | ||
efa54579 | 486 | static ssize_t validate_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
487 | size_t count, loff_t *ppos) |
488 | { | |
e8eeded3 DH |
489 | struct rtas_validate_flash_t *const args_buf = |
490 | &rtas_validate_flash_data; | |
a94a1472 | 491 | char msg[VALIDATE_MSG_LEN]; |
1da177e4 LT |
492 | int msglen; |
493 | ||
e8eeded3 | 494 | mutex_lock(&rtas_validate_flash_mutex); |
a94a1472 | 495 | msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN); |
e8eeded3 | 496 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 | 497 | |
4c4a5cf6 | 498 | return simple_read_from_buffer(buf, count, ppos, msg, msglen); |
1da177e4 LT |
499 | } |
500 | ||
efa54579 | 501 | static ssize_t validate_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
502 | size_t count, loff_t *off) |
503 | { | |
e8eeded3 DH |
504 | struct rtas_validate_flash_t *const args_buf = |
505 | &rtas_validate_flash_data; | |
1da177e4 LT |
506 | int rc; |
507 | ||
e8eeded3 | 508 | mutex_lock(&rtas_validate_flash_mutex); |
1da177e4 LT |
509 | |
510 | /* We are only interested in the first 4K of the | |
511 | * candidate image */ | |
512 | if ((*off >= VALIDATE_BUF_SIZE) || | |
513 | (args_buf->status == VALIDATE_AUTH)) { | |
514 | *off += count; | |
e8eeded3 | 515 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 LT |
516 | return count; |
517 | } | |
518 | ||
519 | if (*off + count >= VALIDATE_BUF_SIZE) { | |
520 | count = VALIDATE_BUF_SIZE - *off; | |
521 | args_buf->status = VALIDATE_READY; | |
522 | } else { | |
523 | args_buf->status = VALIDATE_INCOMPLETE; | |
524 | } | |
525 | ||
526 | if (!access_ok(VERIFY_READ, buf, count)) { | |
527 | rc = -EFAULT; | |
528 | goto done; | |
529 | } | |
530 | if (copy_from_user(args_buf->buf + *off, buf, count)) { | |
531 | rc = -EFAULT; | |
532 | goto done; | |
533 | } | |
534 | ||
535 | *off += count; | |
536 | rc = count; | |
537 | done: | |
e8eeded3 | 538 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 LT |
539 | return rc; |
540 | } | |
541 | ||
542 | static int validate_flash_release(struct inode *inode, struct file *file) | |
543 | { | |
e8eeded3 DH |
544 | struct rtas_validate_flash_t *const args_buf = |
545 | &rtas_validate_flash_data; | |
1da177e4 | 546 | |
e8eeded3 | 547 | mutex_lock(&rtas_validate_flash_mutex); |
1da177e4 LT |
548 | |
549 | if (args_buf->status == VALIDATE_READY) { | |
550 | args_buf->buf_size = VALIDATE_BUF_SIZE; | |
551 | validate_flash(args_buf); | |
552 | } | |
553 | ||
e8eeded3 | 554 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 LT |
555 | return 0; |
556 | } | |
557 | ||
e8eeded3 DH |
558 | /* |
559 | * On-reboot flash update applicator. | |
560 | */ | |
f4fcbbe9 PM |
561 | static void rtas_flash_firmware(int reboot_type) |
562 | { | |
563 | unsigned long image_size; | |
564 | struct flash_block_list *f, *next, *flist; | |
565 | unsigned long rtas_block_list; | |
566 | int i, status, update_token; | |
567 | ||
bd2b64a1 | 568 | if (rtas_firmware_flash_list == NULL) |
f4fcbbe9 PM |
569 | return; /* nothing to do */ |
570 | ||
571 | if (reboot_type != SYS_RESTART) { | |
572 | printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); | |
573 | printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); | |
574 | return; | |
575 | } | |
576 | ||
577 | update_token = rtas_token("ibm,update-flash-64-and-reboot"); | |
578 | if (update_token == RTAS_UNKNOWN_SERVICE) { | |
579 | printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " | |
580 | "is not available -- not a service partition?\n"); | |
581 | printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); | |
582 | return; | |
583 | } | |
584 | ||
df17f56d RN |
585 | /* |
586 | * Just before starting the firmware flash, cancel the event scan work | |
587 | * to avoid any soft lockup issues. | |
588 | */ | |
589 | rtas_cancel_event_scan(); | |
590 | ||
bd2b64a1 MM |
591 | /* |
592 | * NOTE: the "first" block must be under 4GB, so we create | |
593 | * an entry with no data blocks in the reserved buffer in | |
594 | * the kernel data segment. | |
f4fcbbe9 | 595 | */ |
bd2b64a1 MM |
596 | spin_lock(&rtas_data_buf_lock); |
597 | flist = (struct flash_block_list *)&rtas_data_buf[0]; | |
598 | flist->num_blocks = 0; | |
599 | flist->next = rtas_firmware_flash_list; | |
3d267523 | 600 | rtas_block_list = __pa(flist); |
f4fcbbe9 PM |
601 | if (rtas_block_list >= 4UL*1024*1024*1024) { |
602 | printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); | |
bd2b64a1 | 603 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
604 | return; |
605 | } | |
606 | ||
607 | printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); | |
608 | /* Update the block_list in place. */ | |
bd2b64a1 | 609 | rtas_firmware_flash_list = NULL; /* too hard to backout on error */ |
f4fcbbe9 PM |
610 | image_size = 0; |
611 | for (f = flist; f; f = next) { | |
612 | /* Translate data addrs to absolute */ | |
613 | for (i = 0; i < f->num_blocks; i++) { | |
396a3434 | 614 | f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data)); |
f4fcbbe9 | 615 | image_size += f->blocks[i].length; |
396a3434 | 616 | f->blocks[i].length = cpu_to_be64(f->blocks[i].length); |
f4fcbbe9 PM |
617 | } |
618 | next = f->next; | |
619 | /* Don't translate NULL pointer for last entry */ | |
620 | if (f->next) | |
396a3434 | 621 | f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next)); |
f4fcbbe9 PM |
622 | else |
623 | f->next = NULL; | |
624 | /* make num_blocks into the version/length field */ | |
625 | f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); | |
396a3434 | 626 | f->num_blocks = cpu_to_be64(f->num_blocks); |
f4fcbbe9 PM |
627 | } |
628 | ||
629 | printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); | |
630 | printk(KERN_ALERT "FLASH: performing flash and reboot\n"); | |
631 | rtas_progress("Flashing \n", 0x0); | |
632 | rtas_progress("Please Wait... ", 0x0); | |
633 | printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); | |
634 | status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); | |
635 | switch (status) { /* should only get "bad" status */ | |
636 | case 0: | |
637 | printk(KERN_ALERT "FLASH: success\n"); | |
638 | break; | |
639 | case -1: | |
640 | printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); | |
641 | break; | |
642 | case -3: | |
643 | printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); | |
644 | break; | |
645 | case -4: | |
646 | printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); | |
647 | break; | |
648 | default: | |
649 | printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); | |
650 | break; | |
651 | } | |
bd2b64a1 | 652 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
653 | } |
654 | ||
e8eeded3 DH |
655 | /* |
656 | * Manifest of proc files to create | |
657 | */ | |
658 | struct rtas_flash_file { | |
659 | const char *filename; | |
660 | const char *rtas_call_name; | |
1da177e4 | 661 | int *status; |
e8eeded3 | 662 | const struct file_operations fops; |
1da177e4 LT |
663 | }; |
664 | ||
e8eeded3 DH |
665 | static const struct rtas_flash_file rtas_flash_files[] = { |
666 | { | |
667 | .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME, | |
668 | .rtas_call_name = "ibm,update-flash-64-and-reboot", | |
669 | .status = &rtas_update_flash_data.status, | |
670 | .fops.read = rtas_flash_read_msg, | |
671 | .fops.write = rtas_flash_write, | |
672 | .fops.release = rtas_flash_release, | |
673 | .fops.llseek = default_llseek, | |
674 | }, | |
675 | { | |
676 | .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME, | |
677 | .rtas_call_name = "ibm,update-flash-64-and-reboot", | |
678 | .status = &rtas_update_flash_data.status, | |
679 | .fops.read = rtas_flash_read_num, | |
680 | .fops.write = rtas_flash_write, | |
681 | .fops.release = rtas_flash_release, | |
682 | .fops.llseek = default_llseek, | |
683 | }, | |
684 | { | |
685 | .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME, | |
686 | .rtas_call_name = "ibm,validate-flash-image", | |
687 | .status = &rtas_validate_flash_data.status, | |
688 | .fops.read = validate_flash_read, | |
689 | .fops.write = validate_flash_write, | |
690 | .fops.release = validate_flash_release, | |
691 | .fops.llseek = default_llseek, | |
692 | }, | |
693 | { | |
694 | .filename = "powerpc/rtas/" MANAGE_FLASH_NAME, | |
695 | .rtas_call_name = "ibm,manage-flash-image", | |
696 | .status = &rtas_manage_flash_data.status, | |
697 | .fops.read = manage_flash_read, | |
698 | .fops.write = manage_flash_write, | |
699 | .fops.llseek = default_llseek, | |
700 | } | |
1da177e4 LT |
701 | }; |
702 | ||
1c21a293 | 703 | static int __init rtas_flash_init(void) |
1da177e4 | 704 | { |
e8eeded3 | 705 | int i; |
1da177e4 LT |
706 | |
707 | if (rtas_token("ibm,update-flash-64-and-reboot") == | |
708 | RTAS_UNKNOWN_SERVICE) { | |
0e384983 | 709 | pr_info("rtas_flash: no firmware flash support\n"); |
0c930692 | 710 | return -EINVAL; |
1da177e4 LT |
711 | } |
712 | ||
e8eeded3 DH |
713 | rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL); |
714 | if (!rtas_validate_flash_data.buf) | |
715 | return -ENOMEM; | |
1da177e4 | 716 | |
e8eeded3 DH |
717 | flash_block_cache = kmem_cache_create("rtas_flash_cache", |
718 | RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0, | |
5a148af6 | 719 | NULL); |
e8eeded3 DH |
720 | if (!flash_block_cache) { |
721 | printk(KERN_ERR "%s: failed to create block cache\n", | |
722 | __func__); | |
723 | goto enomem_buf; | |
1da177e4 LT |
724 | } |
725 | ||
e8eeded3 DH |
726 | for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { |
727 | const struct rtas_flash_file *f = &rtas_flash_files[i]; | |
728 | int token; | |
1da177e4 | 729 | |
e8eeded3 DH |
730 | if (!proc_create(f->filename, S_IRUSR | S_IWUSR, NULL, &f->fops)) |
731 | goto enomem; | |
1da177e4 | 732 | |
e8eeded3 DH |
733 | /* |
734 | * This code assumes that the status int is the first member of the | |
735 | * struct | |
736 | */ | |
737 | token = rtas_token(f->rtas_call_name); | |
738 | if (token == RTAS_UNKNOWN_SERVICE) | |
739 | *f->status = FLASH_AUTH; | |
740 | else | |
741 | *f->status = FLASH_NO_OP; | |
742 | } | |
1da177e4 | 743 | |
f4fcbbe9 | 744 | rtas_flash_term_hook = rtas_flash_firmware; |
1da177e4 LT |
745 | return 0; |
746 | ||
e8eeded3 DH |
747 | enomem: |
748 | while (--i >= 0) { | |
749 | const struct rtas_flash_file *f = &rtas_flash_files[i]; | |
750 | remove_proc_entry(f->filename, NULL); | |
751 | } | |
1da177e4 | 752 | |
e8eeded3 DH |
753 | kmem_cache_destroy(flash_block_cache); |
754 | enomem_buf: | |
755 | kfree(rtas_validate_flash_data.buf); | |
756 | return -ENOMEM; | |
1da177e4 LT |
757 | } |
758 | ||
1c21a293 | 759 | static void __exit rtas_flash_cleanup(void) |
1da177e4 | 760 | { |
e8eeded3 DH |
761 | int i; |
762 | ||
f4fcbbe9 | 763 | rtas_flash_term_hook = NULL; |
ae883cab | 764 | |
ad18a364 VH |
765 | if (rtas_firmware_flash_list) { |
766 | free_flash_list(rtas_firmware_flash_list); | |
767 | rtas_firmware_flash_list = NULL; | |
768 | } | |
769 | ||
e8eeded3 DH |
770 | for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { |
771 | const struct rtas_flash_file *f = &rtas_flash_files[i]; | |
772 | remove_proc_entry(f->filename, NULL); | |
773 | } | |
ae883cab | 774 | |
e8eeded3 DH |
775 | kmem_cache_destroy(flash_block_cache); |
776 | kfree(rtas_validate_flash_data.buf); | |
1da177e4 LT |
777 | } |
778 | ||
779 | module_init(rtas_flash_init); | |
780 | module_exit(rtas_flash_cleanup); | |
781 | MODULE_LICENSE("GPL"); |