1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * c 2001 PPC 64 Team, IBM Corp |
4 | * |
5 | * /proc/powerpc/rtas/firmware_flash interface |
6 | * |
7 | * This file implements a firmware_flash interface to pump a firmware |
8 | * image into the kernel. At reboot time rtas_restart() will see the |
9 | * firmware image and flash it as it reboots (see rtas.c). |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/proc_fs.h> |
16 | #include <linux/reboot.h> |
17 | #include <asm/delay.h> |
18 | #include <linux/uaccess.h> |
19 | #include <asm/rtas.h> |
20 | |
21 | #define MODULE_VERS "1.0" |
22 | #define MODULE_NAME "rtas_flash" |
23 | |
24 | #define FIRMWARE_FLASH_NAME "firmware_flash" |
25 | #define FIRMWARE_UPDATE_NAME "firmware_update" |
26 | #define MANAGE_FLASH_NAME "manage_flash" |
27 | #define VALIDATE_FLASH_NAME "validate_flash" |
28 | |
29 | /* General RTAS Status Codes */ |
30 | #define RTAS_RC_SUCCESS 0 |
31 | #define RTAS_RC_HW_ERR -1 |
32 | #define RTAS_RC_BUSY -2 |
33 | |
34 | /* Flash image status values */ |
35 | #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ |
36 | #define FLASH_NO_OP -1099 /* No operation initiated by user */ |
37 | #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ |
38 | #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ |
39 | #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ |
40 | #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ |
41 | |
42 | /* Manage image status values */ |
43 | #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ |
44 | #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ |
45 | #define MANAGE_NO_OP -1099 /* No operation initiated by user */ |
46 | #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ |
47 | #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ |
48 | |
49 | /* Validate image status values */ |
50 | #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ |
51 | #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ |
52 | #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ |
53 | #define VALIDATE_READY -1001 /* Firmware image ready for validation */ |
54 | #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ |
55 | #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ |
56 | |
57 | /* ibm,validate-flash-image update result tokens */ |
58 | #define VALIDATE_TMP_UPDATE 0 /* T side will be updated */ |
59 | #define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */ |
60 | #define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */ |
61 | #define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */ |
62 | /* |
63 | * Current T side will be committed to P side before being replace with new |
64 | * image, and the new image is downlevel from current image |
65 | */ |
66 | #define VALIDATE_TMP_COMMIT_DL 4 |
67 | /* |
68 | * Current T side will be committed to P side before being replaced with new |
69 | * image |
70 | */ |
71 | #define VALIDATE_TMP_COMMIT 5 |
72 | /* |
73 | * T side will be updated with a downlevel image |
74 | */ |
75 | #define VALIDATE_TMP_UPDATE_DL 6 |
76 | /* |
77 | * The candidate image's release date is later than the system's firmware |
78 | * service entitlement date - service warranty period has expired |
79 | */ |
80 | #define VALIDATE_OUT_OF_WRNTY 7 |
81 | |
82 | /* ibm,manage-flash-image operation tokens */ |
83 | #define RTAS_REJECT_TMP_IMG 0 |
84 | #define RTAS_COMMIT_TMP_IMG 1 |
85 | |
86 | /* Array sizes */ |
87 | #define VALIDATE_BUF_SIZE 4096 |
88 | #define VALIDATE_MSG_LEN 256 |
89 | #define RTAS_MSG_MAXLEN 64 |
90 | |
91 | /* Quirk - RTAS requires 4k list length and block size */ |
92 | #define RTAS_BLKLIST_LENGTH 4096 |
93 | #define RTAS_BLK_SIZE 4096 |
94 | |
95 | struct flash_block { |
96 | char *data; |
97 | unsigned long length; |
98 | }; |
99 | |
100 | /* This struct is very similar but not identical to |
101 | * that needed by the rtas flash update. |
102 | * All we need to do for rtas is rewrite num_blocks |
103 | * into a version/length and translate the pointers |
104 | * to absolute. |
105 | */ |
106 | #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) |
107 | struct flash_block_list { |
108 | unsigned long num_blocks; |
109 | struct flash_block_list *next; |
110 | struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; |
111 | }; |
112 | |
113 | static struct flash_block_list *rtas_firmware_flash_list; |
114 | |
115 | /* Use slab cache to guarantee 4k alignment */ |
116 | static struct kmem_cache *flash_block_cache = NULL; |
117 | |
118 | #define FLASH_BLOCK_LIST_VERSION (1UL) |
119 | |
120 | /* |
121 | * Local copy of the flash block list. |
122 | * |
123 | * The rtas_firmware_flash_list variable will be |
124 | * set once the data is fully read. |
125 | * |
126 | * For convenience as we build the list we use virtual addrs, |
127 | * we do not fill in the version number, and the length field |
128 | * is treated as the number of entries currently in the block |
129 | * (i.e. not a byte count). This is all fixed when calling |
130 | * the flash routine. |
131 | */ |
132 | |
133 | /* Status int must be first member of struct */ |
134 | struct rtas_update_flash_t |
135 | { |
136 | int status; /* Flash update status */ |
137 | struct flash_block_list *flist; /* Local copy of flash block list */ |
138 | }; |
139 | |
140 | /* Status int must be first member of struct */ |
141 | struct rtas_manage_flash_t |
142 | { |
143 | int status; /* Returned status */ |
144 | }; |
145 | |
146 | /* Status int must be first member of struct */ |
147 | struct rtas_validate_flash_t |
148 | { |
149 | int status; /* Returned status */ |
150 | char *buf; /* Candidate image buffer */ |
151 | unsigned int buf_size; /* Size of image buf */ |
152 | unsigned int update_results; /* Update results token */ |
153 | }; |
154 | |
155 | static struct rtas_update_flash_t rtas_update_flash_data; |
156 | static struct rtas_manage_flash_t rtas_manage_flash_data; |
157 | static struct rtas_validate_flash_t rtas_validate_flash_data; |
158 | static DEFINE_MUTEX(rtas_update_flash_mutex); |
159 | static DEFINE_MUTEX(rtas_manage_flash_mutex); |
160 | static DEFINE_MUTEX(rtas_validate_flash_mutex); |
161 | |
162 | /* Do simple sanity checks on the flash image. */ |
163 | static int flash_list_valid(struct flash_block_list *flist) |
164 | { |
165 | struct flash_block_list *f; |
166 | int i; |
167 | unsigned long block_size, image_size; |
168 | |
169 | /* Paranoid self test here. We also collect the image size. */ |
170 | image_size = 0; |
171 | for (f = flist; f; f = f->next) { |
172 | for (i = 0; i < f->num_blocks; i++) { |
173 | if (f->blocks[i].data == NULL) { |
174 | return FLASH_IMG_NULL_DATA; |
175 | } |
176 | block_size = f->blocks[i].length; |
177 | if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { |
178 | return FLASH_IMG_BAD_LEN; |
179 | } |
180 | image_size += block_size; |
181 | } |
182 | } |
183 | |
184 | if (image_size < (256 << 10)) { |
185 | if (image_size < 2) |
186 | return FLASH_NO_OP; |
187 | } |
188 | |
189 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n" , image_size); |
190 | |
191 | return FLASH_IMG_READY; |
192 | } |
193 | |
194 | static void free_flash_list(struct flash_block_list *f) |
195 | { |
196 | struct flash_block_list *next; |
197 | int i; |
198 | |
199 | while (f) { |
200 | for (i = 0; i < f->num_blocks; i++) |
201 | kmem_cache_free(s: flash_block_cache, objp: f->blocks[i].data); |
202 | next = f->next; |
203 | kmem_cache_free(s: flash_block_cache, objp: f); |
204 | f = next; |
205 | } |
206 | } |
207 | |
208 | static int rtas_flash_release(struct inode *inode, struct file *file) |
209 | { |
210 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
211 | |
212 | mutex_lock(&rtas_update_flash_mutex); |
213 | |
214 | if (uf->flist) { |
215 | /* File was opened in write mode for a new flash attempt */ |
216 | /* Clear saved list */ |
217 | if (rtas_firmware_flash_list) { |
218 | free_flash_list(f: rtas_firmware_flash_list); |
219 | rtas_firmware_flash_list = NULL; |
220 | } |
221 | |
222 | if (uf->status != FLASH_AUTH) |
223 | uf->status = flash_list_valid(flist: uf->flist); |
224 | |
225 | if (uf->status == FLASH_IMG_READY) |
226 | rtas_firmware_flash_list = uf->flist; |
227 | else |
228 | free_flash_list(f: uf->flist); |
229 | |
230 | uf->flist = NULL; |
231 | } |
232 | |
233 | mutex_unlock(lock: &rtas_update_flash_mutex); |
234 | return 0; |
235 | } |
236 | |
237 | static size_t get_flash_status_msg(int status, char *buf) |
238 | { |
239 | const char *msg; |
240 | size_t len; |
241 | |
242 | switch (status) { |
243 | case FLASH_AUTH: |
244 | msg = "error: this partition does not have service authority\n" ; |
245 | break; |
246 | case FLASH_NO_OP: |
247 | msg = "info: no firmware image for flash\n" ; |
248 | break; |
249 | case FLASH_IMG_SHORT: |
250 | msg = "error: flash image short\n" ; |
251 | break; |
252 | case FLASH_IMG_BAD_LEN: |
253 | msg = "error: internal error bad length\n" ; |
254 | break; |
255 | case FLASH_IMG_NULL_DATA: |
256 | msg = "error: internal error null data\n" ; |
257 | break; |
258 | case FLASH_IMG_READY: |
259 | msg = "ready: firmware image ready for flash on reboot\n" ; |
260 | break; |
261 | default: |
262 | return sprintf(buf, fmt: "error: unexpected status value %d\n" , |
263 | status); |
264 | } |
265 | |
266 | len = strlen(msg); |
267 | memcpy(buf, msg, len + 1); |
268 | return len; |
269 | } |
270 | |
271 | /* Reading the proc file will show status (not the firmware contents) */ |
272 | static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf, |
273 | size_t count, loff_t *ppos) |
274 | { |
275 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
276 | char msg[RTAS_MSG_MAXLEN]; |
277 | size_t len; |
278 | int status; |
279 | |
280 | mutex_lock(&rtas_update_flash_mutex); |
281 | status = uf->status; |
282 | mutex_unlock(lock: &rtas_update_flash_mutex); |
283 | |
284 | /* Read as text message */ |
285 | len = get_flash_status_msg(status, buf: msg); |
286 | return simple_read_from_buffer(to: buf, count, ppos, from: msg, available: len); |
287 | } |
288 | |
289 | static ssize_t rtas_flash_read_num(struct file *file, char __user *buf, |
290 | size_t count, loff_t *ppos) |
291 | { |
292 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
293 | char msg[RTAS_MSG_MAXLEN]; |
294 | int status; |
295 | |
296 | mutex_lock(&rtas_update_flash_mutex); |
297 | status = uf->status; |
298 | mutex_unlock(lock: &rtas_update_flash_mutex); |
299 | |
300 | /* Read as number */ |
301 | sprintf(buf: msg, fmt: "%d\n" , status); |
302 | return simple_read_from_buffer(to: buf, count, ppos, from: msg, strlen(msg)); |
303 | } |
304 | |
305 | /* We could be much more efficient here. But to keep this function |
306 | * simple we allocate a page to the block list no matter how small the |
307 | * count is. If the system is low on memory it will be just as well |
308 | * that we fail.... |
309 | */ |
310 | static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, |
311 | size_t count, loff_t *off) |
312 | { |
313 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
314 | char *p; |
315 | int next_free, rc; |
316 | struct flash_block_list *fl; |
317 | |
318 | mutex_lock(&rtas_update_flash_mutex); |
319 | |
320 | if (uf->status == FLASH_AUTH || count == 0) |
321 | goto out; /* discard data */ |
322 | |
323 | /* In the case that the image is not ready for flashing, the memory |
324 | * allocated for the block list will be freed upon the release of the |
325 | * proc file |
326 | */ |
327 | if (uf->flist == NULL) { |
328 | uf->flist = kmem_cache_zalloc(k: flash_block_cache, GFP_KERNEL); |
329 | if (!uf->flist) |
330 | goto nomem; |
331 | } |
332 | |
333 | fl = uf->flist; |
334 | while (fl->next) |
335 | fl = fl->next; /* seek to last block_list for append */ |
336 | next_free = fl->num_blocks; |
337 | if (next_free == FLASH_BLOCKS_PER_NODE) { |
338 | /* Need to allocate another block_list */ |
339 | fl->next = kmem_cache_zalloc(k: flash_block_cache, GFP_KERNEL); |
340 | if (!fl->next) |
341 | goto nomem; |
342 | fl = fl->next; |
343 | next_free = 0; |
344 | } |
345 | |
346 | if (count > RTAS_BLK_SIZE) |
347 | count = RTAS_BLK_SIZE; |
348 | p = kmem_cache_zalloc(k: flash_block_cache, GFP_KERNEL); |
349 | if (!p) |
350 | goto nomem; |
351 | |
352 | if(copy_from_user(to: p, from: buffer, n: count)) { |
353 | kmem_cache_free(s: flash_block_cache, objp: p); |
354 | rc = -EFAULT; |
355 | goto error; |
356 | } |
357 | fl->blocks[next_free].data = p; |
358 | fl->blocks[next_free].length = count; |
359 | fl->num_blocks++; |
360 | out: |
361 | mutex_unlock(lock: &rtas_update_flash_mutex); |
362 | return count; |
363 | |
364 | nomem: |
365 | rc = -ENOMEM; |
366 | error: |
367 | mutex_unlock(lock: &rtas_update_flash_mutex); |
368 | return rc; |
369 | } |
370 | |
371 | /* |
372 | * Flash management routines. |
373 | */ |
374 | static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op) |
375 | { |
376 | s32 rc; |
377 | |
378 | do { |
379 | rc = rtas_call(rtas_function_token(RTAS_FN_IBM_MANAGE_FLASH_IMAGE), 1, 1, |
380 | NULL, op); |
381 | } while (rtas_busy_delay(rc)); |
382 | |
383 | args_buf->status = rc; |
384 | } |
385 | |
386 | static ssize_t manage_flash_read(struct file *file, char __user *buf, |
387 | size_t count, loff_t *ppos) |
388 | { |
389 | struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; |
390 | char msg[RTAS_MSG_MAXLEN]; |
391 | int msglen, status; |
392 | |
393 | mutex_lock(&rtas_manage_flash_mutex); |
394 | status = args_buf->status; |
395 | mutex_unlock(lock: &rtas_manage_flash_mutex); |
396 | |
397 | msglen = sprintf(buf: msg, fmt: "%d\n" , status); |
398 | return simple_read_from_buffer(to: buf, count, ppos, from: msg, available: msglen); |
399 | } |
400 | |
401 | static ssize_t manage_flash_write(struct file *file, const char __user *buf, |
402 | size_t count, loff_t *off) |
403 | { |
404 | struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; |
405 | static const char reject_str[] = "0" ; |
406 | static const char commit_str[] = "1" ; |
407 | char stkbuf[10]; |
408 | int op, rc; |
409 | |
410 | mutex_lock(&rtas_manage_flash_mutex); |
411 | |
412 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) |
413 | goto out; |
414 | |
415 | op = -1; |
416 | if (buf) { |
417 | if (count > 9) count = 9; |
418 | rc = -EFAULT; |
419 | if (copy_from_user (to: stkbuf, from: buf, n: count)) |
420 | goto error; |
421 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) |
422 | op = RTAS_REJECT_TMP_IMG; |
423 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) |
424 | op = RTAS_COMMIT_TMP_IMG; |
425 | } |
426 | |
427 | if (op == -1) { /* buf is empty, or contains invalid string */ |
428 | rc = -EINVAL; |
429 | goto error; |
430 | } |
431 | |
432 | manage_flash(args_buf, op); |
433 | out: |
434 | mutex_unlock(lock: &rtas_manage_flash_mutex); |
435 | return count; |
436 | |
437 | error: |
438 | mutex_unlock(lock: &rtas_manage_flash_mutex); |
439 | return rc; |
440 | } |
441 | |
442 | /* |
443 | * Validation routines. |
444 | */ |
445 | static void validate_flash(struct rtas_validate_flash_t *args_buf) |
446 | { |
447 | int token = rtas_function_token(RTAS_FN_IBM_VALIDATE_FLASH_IMAGE); |
448 | int update_results; |
449 | s32 rc; |
450 | |
451 | rc = 0; |
452 | do { |
453 | spin_lock(lock: &rtas_data_buf_lock); |
454 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); |
455 | rc = rtas_call(token, 2, 2, &update_results, |
456 | (u32) __pa(rtas_data_buf), args_buf->buf_size); |
457 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); |
458 | spin_unlock(lock: &rtas_data_buf_lock); |
459 | } while (rtas_busy_delay(rc)); |
460 | |
461 | args_buf->status = rc; |
462 | args_buf->update_results = update_results; |
463 | } |
464 | |
465 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, |
466 | char *msg, int msglen) |
467 | { |
468 | int n; |
469 | |
470 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { |
471 | n = sprintf(buf: msg, fmt: "%d\n" , args_buf->update_results); |
472 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || |
473 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) |
474 | n += snprintf(buf: msg + n, size: msglen - n, fmt: "%s\n" , |
475 | args_buf->buf); |
476 | } else { |
477 | n = sprintf(buf: msg, fmt: "%d\n" , args_buf->status); |
478 | } |
479 | return n; |
480 | } |
481 | |
482 | static ssize_t validate_flash_read(struct file *file, char __user *buf, |
483 | size_t count, loff_t *ppos) |
484 | { |
485 | struct rtas_validate_flash_t *const args_buf = |
486 | &rtas_validate_flash_data; |
487 | char msg[VALIDATE_MSG_LEN]; |
488 | int msglen; |
489 | |
490 | mutex_lock(&rtas_validate_flash_mutex); |
491 | msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN); |
492 | mutex_unlock(lock: &rtas_validate_flash_mutex); |
493 | |
494 | return simple_read_from_buffer(to: buf, count, ppos, from: msg, available: msglen); |
495 | } |
496 | |
497 | static ssize_t validate_flash_write(struct file *file, const char __user *buf, |
498 | size_t count, loff_t *off) |
499 | { |
500 | struct rtas_validate_flash_t *const args_buf = |
501 | &rtas_validate_flash_data; |
502 | int rc; |
503 | |
504 | mutex_lock(&rtas_validate_flash_mutex); |
505 | |
506 | /* We are only interested in the first 4K of the |
507 | * candidate image */ |
508 | if ((*off >= VALIDATE_BUF_SIZE) || |
509 | (args_buf->status == VALIDATE_AUTH)) { |
510 | *off += count; |
511 | mutex_unlock(lock: &rtas_validate_flash_mutex); |
512 | return count; |
513 | } |
514 | |
515 | if (*off + count >= VALIDATE_BUF_SIZE) { |
516 | count = VALIDATE_BUF_SIZE - *off; |
517 | args_buf->status = VALIDATE_READY; |
518 | } else { |
519 | args_buf->status = VALIDATE_INCOMPLETE; |
520 | } |
521 | |
522 | if (!access_ok(buf, count)) { |
523 | rc = -EFAULT; |
524 | goto done; |
525 | } |
526 | if (copy_from_user(to: args_buf->buf + *off, from: buf, n: count)) { |
527 | rc = -EFAULT; |
528 | goto done; |
529 | } |
530 | |
531 | *off += count; |
532 | rc = count; |
533 | done: |
534 | mutex_unlock(lock: &rtas_validate_flash_mutex); |
535 | return rc; |
536 | } |
537 | |
538 | static int validate_flash_release(struct inode *inode, struct file *file) |
539 | { |
540 | struct rtas_validate_flash_t *const args_buf = |
541 | &rtas_validate_flash_data; |
542 | |
543 | mutex_lock(&rtas_validate_flash_mutex); |
544 | |
545 | if (args_buf->status == VALIDATE_READY) { |
546 | args_buf->buf_size = VALIDATE_BUF_SIZE; |
547 | validate_flash(args_buf); |
548 | } |
549 | |
550 | mutex_unlock(lock: &rtas_validate_flash_mutex); |
551 | return 0; |
552 | } |
553 | |
554 | /* |
555 | * On-reboot flash update applicator. |
556 | */ |
557 | static void rtas_flash_firmware(int reboot_type) |
558 | { |
559 | unsigned long image_size; |
560 | struct flash_block_list *f, *next, *flist; |
561 | unsigned long rtas_block_list; |
562 | int i, status, update_token; |
563 | |
564 | if (rtas_firmware_flash_list == NULL) |
565 | return; /* nothing to do */ |
566 | |
567 | if (reboot_type != SYS_RESTART) { |
568 | printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n" ); |
569 | printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n" ); |
570 | return; |
571 | } |
572 | |
573 | update_token = rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT); |
574 | if (update_token == RTAS_UNKNOWN_SERVICE) { |
575 | printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " |
576 | "is not available -- not a service partition?\n" ); |
577 | printk(KERN_ALERT "FLASH: firmware will not be flashed\n" ); |
578 | return; |
579 | } |
580 | |
581 | /* |
582 | * Just before starting the firmware flash, cancel the event scan work |
583 | * to avoid any soft lockup issues. |
584 | */ |
585 | rtas_cancel_event_scan(); |
586 | |
587 | /* |
588 | * NOTE: the "first" block must be under 4GB, so we create |
589 | * an entry with no data blocks in the reserved buffer in |
590 | * the kernel data segment. |
591 | */ |
592 | spin_lock(lock: &rtas_data_buf_lock); |
593 | flist = (struct flash_block_list *)&rtas_data_buf[0]; |
594 | flist->num_blocks = 0; |
595 | flist->next = rtas_firmware_flash_list; |
596 | rtas_block_list = __pa(flist); |
597 | if (rtas_block_list >= 4UL*1024*1024*1024) { |
598 | printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n" ); |
599 | spin_unlock(lock: &rtas_data_buf_lock); |
600 | return; |
601 | } |
602 | |
603 | printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n" ); |
604 | /* Update the block_list in place. */ |
605 | rtas_firmware_flash_list = NULL; /* too hard to backout on error */ |
606 | image_size = 0; |
607 | for (f = flist; f; f = next) { |
608 | /* Translate data addrs to absolute */ |
609 | for (i = 0; i < f->num_blocks; i++) { |
610 | f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data)); |
611 | image_size += f->blocks[i].length; |
612 | f->blocks[i].length = cpu_to_be64(f->blocks[i].length); |
613 | } |
614 | next = f->next; |
615 | /* Don't translate NULL pointer for last entry */ |
616 | if (f->next) |
617 | f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next)); |
618 | else |
619 | f->next = NULL; |
620 | /* make num_blocks into the version/length field */ |
621 | f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); |
622 | f->num_blocks = cpu_to_be64(f->num_blocks); |
623 | } |
624 | |
625 | printk(KERN_ALERT "FLASH: flash image is %ld bytes\n" , image_size); |
626 | printk(KERN_ALERT "FLASH: performing flash and reboot\n" ); |
627 | rtas_progress("Flashing \n" , 0x0); |
628 | rtas_progress("Please Wait... " , 0x0); |
629 | printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n" ); |
630 | status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); |
631 | switch (status) { /* should only get "bad" status */ |
632 | case 0: |
633 | printk(KERN_ALERT "FLASH: success\n" ); |
634 | break; |
635 | case -1: |
636 | printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n" ); |
637 | break; |
638 | case -3: |
639 | printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n" ); |
640 | break; |
641 | case -4: |
642 | printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n" ); |
643 | break; |
644 | default: |
645 | printk(KERN_ALERT "FLASH: unknown flash return code %d\n" , status); |
646 | break; |
647 | } |
648 | spin_unlock(lock: &rtas_data_buf_lock); |
649 | } |
650 | |
651 | /* |
652 | * Manifest of proc files to create |
653 | */ |
654 | struct rtas_flash_file { |
655 | const char *filename; |
656 | const rtas_fn_handle_t handle; |
657 | int *status; |
658 | const struct proc_ops ops; |
659 | }; |
660 | |
661 | static const struct rtas_flash_file rtas_flash_files[] = { |
662 | { |
663 | .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME, |
664 | .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT, |
665 | .status = &rtas_update_flash_data.status, |
666 | .ops.proc_read = rtas_flash_read_msg, |
667 | .ops.proc_write = rtas_flash_write, |
668 | .ops.proc_release = rtas_flash_release, |
669 | .ops.proc_lseek = default_llseek, |
670 | }, |
671 | { |
672 | .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME, |
673 | .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT, |
674 | .status = &rtas_update_flash_data.status, |
675 | .ops.proc_read = rtas_flash_read_num, |
676 | .ops.proc_write = rtas_flash_write, |
677 | .ops.proc_release = rtas_flash_release, |
678 | .ops.proc_lseek = default_llseek, |
679 | }, |
680 | { |
681 | .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME, |
682 | .handle = RTAS_FN_IBM_VALIDATE_FLASH_IMAGE, |
683 | .status = &rtas_validate_flash_data.status, |
684 | .ops.proc_read = validate_flash_read, |
685 | .ops.proc_write = validate_flash_write, |
686 | .ops.proc_release = validate_flash_release, |
687 | .ops.proc_lseek = default_llseek, |
688 | }, |
689 | { |
690 | .filename = "powerpc/rtas/" MANAGE_FLASH_NAME, |
691 | .handle = RTAS_FN_IBM_MANAGE_FLASH_IMAGE, |
692 | .status = &rtas_manage_flash_data.status, |
693 | .ops.proc_read = manage_flash_read, |
694 | .ops.proc_write = manage_flash_write, |
695 | .ops.proc_lseek = default_llseek, |
696 | } |
697 | }; |
698 | |
699 | static int __init rtas_flash_init(void) |
700 | { |
701 | int i; |
702 | |
703 | if (rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT) == RTAS_UNKNOWN_SERVICE) { |
704 | pr_info("rtas_flash: no firmware flash support\n" ); |
705 | return -EINVAL; |
706 | } |
707 | |
708 | rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL); |
709 | if (!rtas_validate_flash_data.buf) |
710 | return -ENOMEM; |
711 | |
712 | flash_block_cache = kmem_cache_create_usercopy(name: "rtas_flash_cache" , |
713 | RTAS_BLK_SIZE, RTAS_BLK_SIZE, |
714 | flags: 0, useroffset: 0, RTAS_BLK_SIZE, NULL); |
715 | if (!flash_block_cache) { |
716 | printk(KERN_ERR "%s: failed to create block cache\n" , |
717 | __func__); |
718 | goto enomem_buf; |
719 | } |
720 | |
721 | for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { |
722 | const struct rtas_flash_file *f = &rtas_flash_files[i]; |
723 | int token; |
724 | |
725 | if (!proc_create(f->filename, 0600, NULL, &f->ops)) |
726 | goto enomem; |
727 | |
728 | /* |
729 | * This code assumes that the status int is the first member of the |
730 | * struct |
731 | */ |
732 | token = rtas_function_token(f->handle); |
733 | if (token == RTAS_UNKNOWN_SERVICE) |
734 | *f->status = FLASH_AUTH; |
735 | else |
736 | *f->status = FLASH_NO_OP; |
737 | } |
738 | |
739 | rtas_flash_term_hook = rtas_flash_firmware; |
740 | return 0; |
741 | |
742 | enomem: |
743 | while (--i >= 0) { |
744 | const struct rtas_flash_file *f = &rtas_flash_files[i]; |
745 | remove_proc_entry(f->filename, NULL); |
746 | } |
747 | |
748 | kmem_cache_destroy(s: flash_block_cache); |
749 | enomem_buf: |
750 | kfree(objp: rtas_validate_flash_data.buf); |
751 | return -ENOMEM; |
752 | } |
753 | |
754 | static void __exit rtas_flash_cleanup(void) |
755 | { |
756 | int i; |
757 | |
758 | rtas_flash_term_hook = NULL; |
759 | |
760 | if (rtas_firmware_flash_list) { |
761 | free_flash_list(f: rtas_firmware_flash_list); |
762 | rtas_firmware_flash_list = NULL; |
763 | } |
764 | |
765 | for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { |
766 | const struct rtas_flash_file *f = &rtas_flash_files[i]; |
767 | remove_proc_entry(f->filename, NULL); |
768 | } |
769 | |
770 | kmem_cache_destroy(s: flash_block_cache); |
771 | kfree(objp: rtas_validate_flash_data.buf); |
772 | } |
773 | |
774 | module_init(rtas_flash_init); |
775 | module_exit(rtas_flash_cleanup); |
776 | MODULE_LICENSE("GPL" ); |
777 | |