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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 | * /proc/ppc64/rtas/firmware_flash interface | |
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> | |
18 | #include <linux/proc_fs.h> | |
19 | #include <asm/delay.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/rtas.h> | |
f4fcbbe9 | 22 | #include <asm/abs_addr.h> |
1da177e4 LT |
23 | |
24 | #define MODULE_VERS "1.0" | |
25 | #define MODULE_NAME "rtas_flash" | |
26 | ||
27 | #define FIRMWARE_FLASH_NAME "firmware_flash" | |
28 | #define FIRMWARE_UPDATE_NAME "firmware_update" | |
29 | #define MANAGE_FLASH_NAME "manage_flash" | |
30 | #define VALIDATE_FLASH_NAME "validate_flash" | |
31 | ||
32 | /* General RTAS Status Codes */ | |
33 | #define RTAS_RC_SUCCESS 0 | |
34 | #define RTAS_RC_HW_ERR -1 | |
35 | #define RTAS_RC_BUSY -2 | |
36 | ||
37 | /* Flash image status values */ | |
38 | #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
39 | #define FLASH_NO_OP -1099 /* No operation initiated by user */ | |
40 | #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ | |
41 | #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ | |
42 | #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ | |
43 | #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ | |
44 | ||
45 | /* Manage image status values */ | |
46 | #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
47 | #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ | |
48 | #define MANAGE_NO_OP -1099 /* No operation initiated by user */ | |
49 | #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
50 | #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ | |
51 | ||
52 | /* Validate image status values */ | |
53 | #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
54 | #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ | |
55 | #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ | |
56 | #define VALIDATE_READY -1001 /* Firmware image ready for validation */ | |
57 | #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
58 | #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ | |
59 | #define VALIDATE_TMP_UPDATE 0 /* Validate Return Status */ | |
60 | #define VALIDATE_FLASH_AUTH 1 /* Validate Return Status */ | |
61 | #define VALIDATE_INVALID_IMG 2 /* Validate Return Status */ | |
62 | #define VALIDATE_CUR_UNKNOWN 3 /* Validate Return Status */ | |
63 | #define VALIDATE_TMP_COMMIT_DL 4 /* Validate Return Status */ | |
64 | #define VALIDATE_TMP_COMMIT 5 /* Validate Return Status */ | |
65 | #define VALIDATE_TMP_UPDATE_DL 6 /* Validate Return Status */ | |
66 | ||
67 | /* ibm,manage-flash-image operation tokens */ | |
68 | #define RTAS_REJECT_TMP_IMG 0 | |
69 | #define RTAS_COMMIT_TMP_IMG 1 | |
70 | ||
71 | /* Array sizes */ | |
72 | #define VALIDATE_BUF_SIZE 4096 | |
73 | #define RTAS_MSG_MAXLEN 64 | |
74 | ||
f4fcbbe9 PM |
75 | struct flash_block { |
76 | char *data; | |
77 | unsigned long length; | |
78 | }; | |
79 | ||
80 | /* This struct is very similar but not identical to | |
81 | * that needed by the rtas flash update. | |
82 | * All we need to do for rtas is rewrite num_blocks | |
83 | * into a version/length and translate the pointers | |
84 | * to absolute. | |
85 | */ | |
86 | #define FLASH_BLOCKS_PER_NODE ((PAGE_SIZE - 16) / sizeof(struct flash_block)) | |
87 | struct flash_block_list { | |
88 | unsigned long num_blocks; | |
89 | struct flash_block_list *next; | |
90 | struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; | |
91 | }; | |
92 | struct flash_block_list_header { /* just the header of flash_block_list */ | |
93 | unsigned long num_blocks; | |
94 | struct flash_block_list *next; | |
95 | }; | |
96 | ||
97 | static struct flash_block_list_header rtas_firmware_flash_list = {0, NULL}; | |
98 | ||
99 | #define FLASH_BLOCK_LIST_VERSION (1UL) | |
100 | ||
1da177e4 LT |
101 | /* Local copy of the flash block list. |
102 | * We only allow one open of the flash proc file and create this | |
f4fcbbe9 PM |
103 | * list as we go. This list will be put in the |
104 | * rtas_firmware_flash_list var once it is fully read. | |
1da177e4 LT |
105 | * |
106 | * For convenience as we build the list we use virtual addrs, | |
107 | * we do not fill in the version number, and the length field | |
108 | * is treated as the number of entries currently in the block | |
109 | * (i.e. not a byte count). This is all fixed on release. | |
110 | */ | |
111 | ||
112 | /* Status int must be first member of struct */ | |
113 | struct rtas_update_flash_t | |
114 | { | |
115 | int status; /* Flash update status */ | |
116 | struct flash_block_list *flist; /* Local copy of flash block list */ | |
117 | }; | |
118 | ||
119 | /* Status int must be first member of struct */ | |
120 | struct rtas_manage_flash_t | |
121 | { | |
122 | int status; /* Returned status */ | |
123 | unsigned int op; /* Reject or commit image */ | |
124 | }; | |
125 | ||
126 | /* Status int must be first member of struct */ | |
127 | struct rtas_validate_flash_t | |
128 | { | |
129 | int status; /* Returned status */ | |
130 | char buf[VALIDATE_BUF_SIZE]; /* Candidate image buffer */ | |
131 | unsigned int buf_size; /* Size of image buf */ | |
132 | unsigned int update_results; /* Update results token */ | |
133 | }; | |
134 | ||
135 | static DEFINE_SPINLOCK(flash_file_open_lock); | |
136 | static struct proc_dir_entry *firmware_flash_pde; | |
137 | static struct proc_dir_entry *firmware_update_pde; | |
138 | static struct proc_dir_entry *validate_pde; | |
139 | static struct proc_dir_entry *manage_pde; | |
140 | ||
141 | /* Do simple sanity checks on the flash image. */ | |
142 | static int flash_list_valid(struct flash_block_list *flist) | |
143 | { | |
144 | struct flash_block_list *f; | |
145 | int i; | |
146 | unsigned long block_size, image_size; | |
147 | ||
148 | /* Paranoid self test here. We also collect the image size. */ | |
149 | image_size = 0; | |
150 | for (f = flist; f; f = f->next) { | |
151 | for (i = 0; i < f->num_blocks; i++) { | |
152 | if (f->blocks[i].data == NULL) { | |
153 | return FLASH_IMG_NULL_DATA; | |
154 | } | |
155 | block_size = f->blocks[i].length; | |
156 | if (block_size <= 0 || block_size > PAGE_SIZE) { | |
157 | return FLASH_IMG_BAD_LEN; | |
158 | } | |
159 | image_size += block_size; | |
160 | } | |
161 | } | |
162 | ||
163 | if (image_size < (256 << 10)) { | |
164 | if (image_size < 2) | |
165 | return FLASH_NO_OP; | |
166 | } | |
167 | ||
168 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); | |
169 | ||
170 | return FLASH_IMG_READY; | |
171 | } | |
172 | ||
173 | static void free_flash_list(struct flash_block_list *f) | |
174 | { | |
175 | struct flash_block_list *next; | |
176 | int i; | |
177 | ||
178 | while (f) { | |
179 | for (i = 0; i < f->num_blocks; i++) | |
180 | free_page((unsigned long)(f->blocks[i].data)); | |
181 | next = f->next; | |
182 | free_page((unsigned long)f); | |
183 | f = next; | |
184 | } | |
185 | } | |
186 | ||
187 | static int rtas_flash_release(struct inode *inode, struct file *file) | |
188 | { | |
189 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
190 | struct rtas_update_flash_t *uf; | |
191 | ||
192 | uf = (struct rtas_update_flash_t *) dp->data; | |
193 | if (uf->flist) { | |
194 | /* File was opened in write mode for a new flash attempt */ | |
195 | /* Clear saved list */ | |
196 | if (rtas_firmware_flash_list.next) { | |
197 | free_flash_list(rtas_firmware_flash_list.next); | |
198 | rtas_firmware_flash_list.next = NULL; | |
199 | } | |
200 | ||
201 | if (uf->status != FLASH_AUTH) | |
202 | uf->status = flash_list_valid(uf->flist); | |
203 | ||
204 | if (uf->status == FLASH_IMG_READY) | |
205 | rtas_firmware_flash_list.next = uf->flist; | |
206 | else | |
207 | free_flash_list(uf->flist); | |
208 | ||
209 | uf->flist = NULL; | |
210 | } | |
211 | ||
212 | atomic_dec(&dp->count); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static void get_flash_status_msg(int status, char *buf) | |
217 | { | |
218 | char *msg; | |
219 | ||
220 | switch (status) { | |
221 | case FLASH_AUTH: | |
222 | msg = "error: this partition does not have service authority\n"; | |
223 | break; | |
224 | case FLASH_NO_OP: | |
225 | msg = "info: no firmware image for flash\n"; | |
226 | break; | |
227 | case FLASH_IMG_SHORT: | |
228 | msg = "error: flash image short\n"; | |
229 | break; | |
230 | case FLASH_IMG_BAD_LEN: | |
231 | msg = "error: internal error bad length\n"; | |
232 | break; | |
233 | case FLASH_IMG_NULL_DATA: | |
234 | msg = "error: internal error null data\n"; | |
235 | break; | |
236 | case FLASH_IMG_READY: | |
237 | msg = "ready: firmware image ready for flash on reboot\n"; | |
238 | break; | |
239 | default: | |
240 | sprintf(buf, "error: unexpected status value %d\n", status); | |
241 | return; | |
242 | } | |
243 | ||
244 | strcpy(buf, msg); | |
245 | } | |
246 | ||
247 | /* Reading the proc file will show status (not the firmware contents) */ | |
efa54579 | 248 | static ssize_t rtas_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
249 | size_t count, loff_t *ppos) |
250 | { | |
251 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
252 | struct rtas_update_flash_t *uf; | |
253 | char msg[RTAS_MSG_MAXLEN]; | |
254 | int msglen; | |
255 | ||
256 | uf = (struct rtas_update_flash_t *) dp->data; | |
257 | ||
258 | if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) { | |
259 | get_flash_status_msg(uf->status, msg); | |
260 | } else { /* FIRMWARE_UPDATE_NAME */ | |
261 | sprintf(msg, "%d\n", uf->status); | |
262 | } | |
263 | msglen = strlen(msg); | |
264 | if (msglen > count) | |
265 | msglen = count; | |
266 | ||
267 | if (ppos && *ppos != 0) | |
268 | return 0; /* be cheap */ | |
269 | ||
270 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
271 | return -EINVAL; | |
272 | ||
273 | if (copy_to_user(buf, msg, msglen)) | |
274 | return -EFAULT; | |
275 | ||
276 | if (ppos) | |
277 | *ppos = msglen; | |
278 | return msglen; | |
279 | } | |
280 | ||
281 | /* We could be much more efficient here. But to keep this function | |
282 | * simple we allocate a page to the block list no matter how small the | |
283 | * count is. If the system is low on memory it will be just as well | |
284 | * that we fail.... | |
285 | */ | |
efa54579 | 286 | static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
287 | size_t count, loff_t *off) |
288 | { | |
289 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
290 | struct rtas_update_flash_t *uf; | |
291 | char *p; | |
292 | int next_free; | |
293 | struct flash_block_list *fl; | |
294 | ||
295 | uf = (struct rtas_update_flash_t *) dp->data; | |
296 | ||
297 | if (uf->status == FLASH_AUTH || count == 0) | |
298 | return count; /* discard data */ | |
299 | ||
300 | /* In the case that the image is not ready for flashing, the memory | |
301 | * allocated for the block list will be freed upon the release of the | |
302 | * proc file | |
303 | */ | |
304 | if (uf->flist == NULL) { | |
305 | uf->flist = (struct flash_block_list *) get_zeroed_page(GFP_KERNEL); | |
306 | if (!uf->flist) | |
307 | return -ENOMEM; | |
308 | } | |
309 | ||
310 | fl = uf->flist; | |
311 | while (fl->next) | |
312 | fl = fl->next; /* seek to last block_list for append */ | |
313 | next_free = fl->num_blocks; | |
314 | if (next_free == FLASH_BLOCKS_PER_NODE) { | |
315 | /* Need to allocate another block_list */ | |
316 | fl->next = (struct flash_block_list *)get_zeroed_page(GFP_KERNEL); | |
317 | if (!fl->next) | |
318 | return -ENOMEM; | |
319 | fl = fl->next; | |
320 | next_free = 0; | |
321 | } | |
322 | ||
323 | if (count > PAGE_SIZE) | |
324 | count = PAGE_SIZE; | |
325 | p = (char *)get_zeroed_page(GFP_KERNEL); | |
326 | if (!p) | |
327 | return -ENOMEM; | |
328 | ||
329 | if(copy_from_user(p, buffer, count)) { | |
330 | free_page((unsigned long)p); | |
331 | return -EFAULT; | |
332 | } | |
333 | fl->blocks[next_free].data = p; | |
334 | fl->blocks[next_free].length = count; | |
335 | fl->num_blocks++; | |
336 | ||
337 | return count; | |
338 | } | |
339 | ||
340 | static int rtas_excl_open(struct inode *inode, struct file *file) | |
341 | { | |
342 | struct proc_dir_entry *dp = PDE(inode); | |
343 | ||
344 | /* Enforce exclusive open with use count of PDE */ | |
345 | spin_lock(&flash_file_open_lock); | |
346 | if (atomic_read(&dp->count) > 1) { | |
347 | spin_unlock(&flash_file_open_lock); | |
348 | return -EBUSY; | |
349 | } | |
350 | ||
351 | atomic_inc(&dp->count); | |
352 | spin_unlock(&flash_file_open_lock); | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | static int rtas_excl_release(struct inode *inode, struct file *file) | |
358 | { | |
359 | struct proc_dir_entry *dp = PDE(inode); | |
360 | ||
361 | atomic_dec(&dp->count); | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | static void manage_flash(struct rtas_manage_flash_t *args_buf) | |
367 | { | |
368 | unsigned int wait_time; | |
369 | s32 rc; | |
370 | ||
371 | while (1) { | |
372 | rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, | |
373 | 1, NULL, args_buf->op); | |
374 | if (rc == RTAS_RC_BUSY) | |
375 | udelay(1); | |
376 | else if (rtas_is_extended_busy(rc)) { | |
377 | wait_time = rtas_extended_busy_delay_time(rc); | |
378 | udelay(wait_time * 1000); | |
379 | } else | |
380 | break; | |
381 | } | |
382 | ||
383 | args_buf->status = rc; | |
384 | } | |
385 | ||
efa54579 | 386 | static ssize_t manage_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
387 | size_t count, loff_t *ppos) |
388 | { | |
389 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
390 | struct rtas_manage_flash_t *args_buf; | |
391 | char msg[RTAS_MSG_MAXLEN]; | |
392 | int msglen; | |
393 | ||
394 | args_buf = (struct rtas_manage_flash_t *) dp->data; | |
395 | if (args_buf == NULL) | |
396 | return 0; | |
397 | ||
398 | msglen = sprintf(msg, "%d\n", args_buf->status); | |
399 | if (msglen > count) | |
400 | msglen = count; | |
401 | ||
402 | if (ppos && *ppos != 0) | |
403 | return 0; /* be cheap */ | |
404 | ||
405 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
406 | return -EINVAL; | |
407 | ||
408 | if (copy_to_user(buf, msg, msglen)) | |
409 | return -EFAULT; | |
410 | ||
411 | if (ppos) | |
412 | *ppos = msglen; | |
413 | return msglen; | |
414 | } | |
415 | ||
efa54579 | 416 | static ssize_t manage_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
417 | size_t count, loff_t *off) |
418 | { | |
419 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
420 | struct rtas_manage_flash_t *args_buf; | |
421 | const char reject_str[] = "0"; | |
422 | const char commit_str[] = "1"; | |
423 | char stkbuf[10]; | |
424 | int op; | |
425 | ||
426 | args_buf = (struct rtas_manage_flash_t *) dp->data; | |
427 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) | |
428 | return count; | |
429 | ||
430 | op = -1; | |
431 | if (buf) { | |
432 | if (count > 9) count = 9; | |
433 | if (copy_from_user (stkbuf, buf, count)) { | |
434 | return -EFAULT; | |
435 | } | |
436 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) | |
437 | op = RTAS_REJECT_TMP_IMG; | |
438 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) | |
439 | op = RTAS_COMMIT_TMP_IMG; | |
440 | } | |
441 | ||
442 | if (op == -1) /* buf is empty, or contains invalid string */ | |
443 | return -EINVAL; | |
444 | ||
445 | args_buf->op = op; | |
446 | manage_flash(args_buf); | |
447 | ||
448 | return count; | |
449 | } | |
450 | ||
451 | static void validate_flash(struct rtas_validate_flash_t *args_buf) | |
452 | { | |
453 | int token = rtas_token("ibm,validate-flash-image"); | |
454 | unsigned int wait_time; | |
455 | int update_results; | |
456 | s32 rc; | |
457 | ||
458 | rc = 0; | |
459 | while(1) { | |
460 | spin_lock(&rtas_data_buf_lock); | |
461 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); | |
462 | rc = rtas_call(token, 2, 2, &update_results, | |
463 | (u32) __pa(rtas_data_buf), args_buf->buf_size); | |
464 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); | |
465 | spin_unlock(&rtas_data_buf_lock); | |
466 | ||
467 | if (rc == RTAS_RC_BUSY) | |
468 | udelay(1); | |
469 | else if (rtas_is_extended_busy(rc)) { | |
470 | wait_time = rtas_extended_busy_delay_time(rc); | |
471 | udelay(wait_time * 1000); | |
472 | } else | |
473 | break; | |
474 | } | |
475 | ||
476 | args_buf->status = rc; | |
477 | args_buf->update_results = update_results; | |
478 | } | |
479 | ||
480 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, | |
481 | char *msg) | |
482 | { | |
483 | int n; | |
484 | ||
485 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { | |
486 | n = sprintf(msg, "%d\n", args_buf->update_results); | |
487 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || | |
488 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) | |
489 | n += sprintf(msg + n, "%s\n", args_buf->buf); | |
490 | } else { | |
491 | n = sprintf(msg, "%d\n", args_buf->status); | |
492 | } | |
493 | return n; | |
494 | } | |
495 | ||
efa54579 | 496 | static ssize_t validate_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
497 | size_t count, loff_t *ppos) |
498 | { | |
499 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
500 | struct rtas_validate_flash_t *args_buf; | |
501 | char msg[RTAS_MSG_MAXLEN]; | |
502 | int msglen; | |
503 | ||
504 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
505 | ||
506 | if (ppos && *ppos != 0) | |
507 | return 0; /* be cheap */ | |
508 | ||
509 | msglen = get_validate_flash_msg(args_buf, msg); | |
510 | if (msglen > count) | |
511 | msglen = count; | |
512 | ||
513 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
514 | return -EINVAL; | |
515 | ||
516 | if (copy_to_user(buf, msg, msglen)) | |
517 | return -EFAULT; | |
518 | ||
519 | if (ppos) | |
520 | *ppos = msglen; | |
521 | return msglen; | |
522 | } | |
523 | ||
efa54579 | 524 | static ssize_t validate_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
525 | size_t count, loff_t *off) |
526 | { | |
527 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
528 | struct rtas_validate_flash_t *args_buf; | |
529 | int rc; | |
530 | ||
531 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
532 | ||
533 | if (dp->data == NULL) { | |
534 | dp->data = kmalloc(sizeof(struct rtas_validate_flash_t), | |
535 | GFP_KERNEL); | |
536 | if (dp->data == NULL) | |
537 | return -ENOMEM; | |
538 | } | |
539 | ||
540 | /* We are only interested in the first 4K of the | |
541 | * candidate image */ | |
542 | if ((*off >= VALIDATE_BUF_SIZE) || | |
543 | (args_buf->status == VALIDATE_AUTH)) { | |
544 | *off += count; | |
545 | return count; | |
546 | } | |
547 | ||
548 | if (*off + count >= VALIDATE_BUF_SIZE) { | |
549 | count = VALIDATE_BUF_SIZE - *off; | |
550 | args_buf->status = VALIDATE_READY; | |
551 | } else { | |
552 | args_buf->status = VALIDATE_INCOMPLETE; | |
553 | } | |
554 | ||
555 | if (!access_ok(VERIFY_READ, buf, count)) { | |
556 | rc = -EFAULT; | |
557 | goto done; | |
558 | } | |
559 | if (copy_from_user(args_buf->buf + *off, buf, count)) { | |
560 | rc = -EFAULT; | |
561 | goto done; | |
562 | } | |
563 | ||
564 | *off += count; | |
565 | rc = count; | |
566 | done: | |
567 | if (rc < 0) { | |
568 | kfree(dp->data); | |
569 | dp->data = NULL; | |
570 | } | |
571 | return rc; | |
572 | } | |
573 | ||
574 | static int validate_flash_release(struct inode *inode, struct file *file) | |
575 | { | |
576 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
577 | struct rtas_validate_flash_t *args_buf; | |
578 | ||
579 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
580 | ||
581 | if (args_buf->status == VALIDATE_READY) { | |
582 | args_buf->buf_size = VALIDATE_BUF_SIZE; | |
583 | validate_flash(args_buf); | |
584 | } | |
585 | ||
586 | /* The matching atomic_inc was in rtas_excl_open() */ | |
587 | atomic_dec(&dp->count); | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
f4fcbbe9 PM |
592 | static void rtas_flash_firmware(int reboot_type) |
593 | { | |
594 | unsigned long image_size; | |
595 | struct flash_block_list *f, *next, *flist; | |
596 | unsigned long rtas_block_list; | |
597 | int i, status, update_token; | |
598 | ||
599 | if (rtas_firmware_flash_list.next == NULL) | |
600 | return; /* nothing to do */ | |
601 | ||
602 | if (reboot_type != SYS_RESTART) { | |
603 | printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); | |
604 | printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); | |
605 | return; | |
606 | } | |
607 | ||
608 | update_token = rtas_token("ibm,update-flash-64-and-reboot"); | |
609 | if (update_token == RTAS_UNKNOWN_SERVICE) { | |
610 | printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " | |
611 | "is not available -- not a service partition?\n"); | |
612 | printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); | |
613 | return; | |
614 | } | |
615 | ||
616 | /* NOTE: the "first" block list is a global var with no data | |
617 | * blocks in the kernel data segment. We do this because | |
618 | * we want to ensure this block_list addr is under 4GB. | |
619 | */ | |
620 | rtas_firmware_flash_list.num_blocks = 0; | |
621 | flist = (struct flash_block_list *)&rtas_firmware_flash_list; | |
622 | rtas_block_list = virt_to_abs(flist); | |
623 | if (rtas_block_list >= 4UL*1024*1024*1024) { | |
624 | printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); | |
625 | return; | |
626 | } | |
627 | ||
628 | printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); | |
629 | /* Update the block_list in place. */ | |
630 | image_size = 0; | |
631 | for (f = flist; f; f = next) { | |
632 | /* Translate data addrs to absolute */ | |
633 | for (i = 0; i < f->num_blocks; i++) { | |
634 | f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data); | |
635 | image_size += f->blocks[i].length; | |
636 | } | |
637 | next = f->next; | |
638 | /* Don't translate NULL pointer for last entry */ | |
639 | if (f->next) | |
640 | f->next = (struct flash_block_list *)virt_to_abs(f->next); | |
641 | else | |
642 | f->next = NULL; | |
643 | /* make num_blocks into the version/length field */ | |
644 | f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); | |
645 | } | |
646 | ||
647 | printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); | |
648 | printk(KERN_ALERT "FLASH: performing flash and reboot\n"); | |
649 | rtas_progress("Flashing \n", 0x0); | |
650 | rtas_progress("Please Wait... ", 0x0); | |
651 | printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); | |
652 | status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); | |
653 | switch (status) { /* should only get "bad" status */ | |
654 | case 0: | |
655 | printk(KERN_ALERT "FLASH: success\n"); | |
656 | break; | |
657 | case -1: | |
658 | printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); | |
659 | break; | |
660 | case -3: | |
661 | printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); | |
662 | break; | |
663 | case -4: | |
664 | printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); | |
665 | break; | |
666 | default: | |
667 | printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); | |
668 | break; | |
669 | } | |
670 | } | |
671 | ||
1da177e4 LT |
672 | static void remove_flash_pde(struct proc_dir_entry *dp) |
673 | { | |
674 | if (dp) { | |
95eff20f | 675 | kfree(dp->data); |
1da177e4 LT |
676 | dp->owner = NULL; |
677 | remove_proc_entry(dp->name, dp->parent); | |
678 | } | |
679 | } | |
680 | ||
681 | static int initialize_flash_pde_data(const char *rtas_call_name, | |
682 | size_t buf_size, | |
683 | struct proc_dir_entry *dp) | |
684 | { | |
685 | int *status; | |
686 | int token; | |
687 | ||
688 | dp->data = kmalloc(buf_size, GFP_KERNEL); | |
689 | if (dp->data == NULL) { | |
690 | remove_flash_pde(dp); | |
691 | return -ENOMEM; | |
692 | } | |
693 | ||
694 | memset(dp->data, 0, buf_size); | |
695 | ||
696 | /* | |
697 | * This code assumes that the status int is the first member of the | |
698 | * struct | |
699 | */ | |
700 | status = (int *) dp->data; | |
701 | token = rtas_token(rtas_call_name); | |
702 | if (token == RTAS_UNKNOWN_SERVICE) | |
703 | *status = FLASH_AUTH; | |
704 | else | |
705 | *status = FLASH_NO_OP; | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | static struct proc_dir_entry *create_flash_pde(const char *filename, | |
711 | struct file_operations *fops) | |
712 | { | |
713 | struct proc_dir_entry *ent = NULL; | |
714 | ||
715 | ent = create_proc_entry(filename, S_IRUSR | S_IWUSR, NULL); | |
716 | if (ent != NULL) { | |
717 | ent->nlink = 1; | |
718 | ent->proc_fops = fops; | |
719 | ent->owner = THIS_MODULE; | |
720 | } | |
721 | ||
722 | return ent; | |
723 | } | |
724 | ||
725 | static struct file_operations rtas_flash_operations = { | |
726 | .read = rtas_flash_read, | |
727 | .write = rtas_flash_write, | |
728 | .open = rtas_excl_open, | |
729 | .release = rtas_flash_release, | |
730 | }; | |
731 | ||
732 | static struct file_operations manage_flash_operations = { | |
733 | .read = manage_flash_read, | |
734 | .write = manage_flash_write, | |
735 | .open = rtas_excl_open, | |
736 | .release = rtas_excl_release, | |
737 | }; | |
738 | ||
739 | static struct file_operations validate_flash_operations = { | |
740 | .read = validate_flash_read, | |
741 | .write = validate_flash_write, | |
742 | .open = rtas_excl_open, | |
743 | .release = validate_flash_release, | |
744 | }; | |
745 | ||
746 | int __init rtas_flash_init(void) | |
747 | { | |
748 | int rc; | |
749 | ||
750 | if (rtas_token("ibm,update-flash-64-and-reboot") == | |
751 | RTAS_UNKNOWN_SERVICE) { | |
752 | printk(KERN_ERR "rtas_flash: no firmware flash support\n"); | |
753 | return 1; | |
754 | } | |
755 | ||
756 | firmware_flash_pde = create_flash_pde("ppc64/rtas/" | |
757 | FIRMWARE_FLASH_NAME, | |
758 | &rtas_flash_operations); | |
759 | if (firmware_flash_pde == NULL) { | |
760 | rc = -ENOMEM; | |
761 | goto cleanup; | |
762 | } | |
763 | ||
764 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
765 | sizeof(struct rtas_update_flash_t), | |
766 | firmware_flash_pde); | |
767 | if (rc != 0) | |
768 | goto cleanup; | |
769 | ||
770 | firmware_update_pde = create_flash_pde("ppc64/rtas/" | |
771 | FIRMWARE_UPDATE_NAME, | |
772 | &rtas_flash_operations); | |
773 | if (firmware_update_pde == NULL) { | |
774 | rc = -ENOMEM; | |
775 | goto cleanup; | |
776 | } | |
777 | ||
778 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
779 | sizeof(struct rtas_update_flash_t), | |
780 | firmware_update_pde); | |
781 | if (rc != 0) | |
782 | goto cleanup; | |
783 | ||
784 | validate_pde = create_flash_pde("ppc64/rtas/" VALIDATE_FLASH_NAME, | |
785 | &validate_flash_operations); | |
786 | if (validate_pde == NULL) { | |
787 | rc = -ENOMEM; | |
788 | goto cleanup; | |
789 | } | |
790 | ||
791 | rc = initialize_flash_pde_data("ibm,validate-flash-image", | |
792 | sizeof(struct rtas_validate_flash_t), | |
793 | validate_pde); | |
794 | if (rc != 0) | |
795 | goto cleanup; | |
796 | ||
797 | manage_pde = create_flash_pde("ppc64/rtas/" MANAGE_FLASH_NAME, | |
798 | &manage_flash_operations); | |
799 | if (manage_pde == NULL) { | |
800 | rc = -ENOMEM; | |
801 | goto cleanup; | |
802 | } | |
803 | ||
804 | rc = initialize_flash_pde_data("ibm,manage-flash-image", | |
805 | sizeof(struct rtas_manage_flash_t), | |
806 | manage_pde); | |
807 | if (rc != 0) | |
808 | goto cleanup; | |
809 | ||
f4fcbbe9 | 810 | rtas_flash_term_hook = rtas_flash_firmware; |
1da177e4 LT |
811 | return 0; |
812 | ||
813 | cleanup: | |
814 | remove_flash_pde(firmware_flash_pde); | |
815 | remove_flash_pde(firmware_update_pde); | |
816 | remove_flash_pde(validate_pde); | |
817 | remove_flash_pde(manage_pde); | |
818 | ||
819 | return rc; | |
820 | } | |
821 | ||
822 | void __exit rtas_flash_cleanup(void) | |
823 | { | |
f4fcbbe9 | 824 | rtas_flash_term_hook = NULL; |
1da177e4 LT |
825 | remove_flash_pde(firmware_flash_pde); |
826 | remove_flash_pde(firmware_update_pde); | |
827 | remove_flash_pde(validate_pde); | |
828 | remove_flash_pde(manage_pde); | |
829 | } | |
830 | ||
831 | module_init(rtas_flash_init); | |
832 | module_exit(rtas_flash_cleanup); | |
833 | MODULE_LICENSE("GPL"); |