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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 | * | |
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 | ||
ae883cab JR |
75 | /* Quirk - RTAS requires 4k list length and block size */ |
76 | #define RTAS_BLKLIST_LENGTH 4096 | |
77 | #define RTAS_BLK_SIZE 4096 | |
78 | ||
f4fcbbe9 PM |
79 | struct flash_block { |
80 | char *data; | |
81 | unsigned long length; | |
82 | }; | |
83 | ||
84 | /* This struct is very similar but not identical to | |
85 | * that needed by the rtas flash update. | |
86 | * All we need to do for rtas is rewrite num_blocks | |
87 | * into a version/length and translate the pointers | |
88 | * to absolute. | |
89 | */ | |
ae883cab | 90 | #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) |
f4fcbbe9 PM |
91 | struct flash_block_list { |
92 | unsigned long num_blocks; | |
93 | struct flash_block_list *next; | |
94 | struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; | |
95 | }; | |
96 | struct flash_block_list_header { /* just the header of flash_block_list */ | |
97 | unsigned long num_blocks; | |
98 | struct flash_block_list *next; | |
99 | }; | |
100 | ||
101 | static struct flash_block_list_header rtas_firmware_flash_list = {0, NULL}; | |
102 | ||
ae883cab | 103 | /* Use slab cache to guarantee 4k alignment */ |
e18b890b | 104 | static struct kmem_cache *flash_block_cache = NULL; |
ae883cab | 105 | |
f4fcbbe9 PM |
106 | #define FLASH_BLOCK_LIST_VERSION (1UL) |
107 | ||
1da177e4 LT |
108 | /* Local copy of the flash block list. |
109 | * We only allow one open of the flash proc file and create this | |
f4fcbbe9 PM |
110 | * list as we go. This list will be put in the |
111 | * rtas_firmware_flash_list var once it is fully read. | |
1da177e4 LT |
112 | * |
113 | * For convenience as we build the list we use virtual addrs, | |
114 | * we do not fill in the version number, and the length field | |
115 | * is treated as the number of entries currently in the block | |
116 | * (i.e. not a byte count). This is all fixed on release. | |
117 | */ | |
118 | ||
119 | /* Status int must be first member of struct */ | |
120 | struct rtas_update_flash_t | |
121 | { | |
122 | int status; /* Flash update status */ | |
123 | struct flash_block_list *flist; /* Local copy of flash block list */ | |
124 | }; | |
125 | ||
126 | /* Status int must be first member of struct */ | |
127 | struct rtas_manage_flash_t | |
128 | { | |
129 | int status; /* Returned status */ | |
130 | unsigned int op; /* Reject or commit image */ | |
131 | }; | |
132 | ||
133 | /* Status int must be first member of struct */ | |
134 | struct rtas_validate_flash_t | |
135 | { | |
136 | int status; /* Returned status */ | |
137 | char buf[VALIDATE_BUF_SIZE]; /* Candidate image buffer */ | |
138 | unsigned int buf_size; /* Size of image buf */ | |
139 | unsigned int update_results; /* Update results token */ | |
140 | }; | |
141 | ||
142 | static DEFINE_SPINLOCK(flash_file_open_lock); | |
143 | static struct proc_dir_entry *firmware_flash_pde; | |
144 | static struct proc_dir_entry *firmware_update_pde; | |
145 | static struct proc_dir_entry *validate_pde; | |
146 | static struct proc_dir_entry *manage_pde; | |
147 | ||
148 | /* Do simple sanity checks on the flash image. */ | |
149 | static int flash_list_valid(struct flash_block_list *flist) | |
150 | { | |
151 | struct flash_block_list *f; | |
152 | int i; | |
153 | unsigned long block_size, image_size; | |
154 | ||
155 | /* Paranoid self test here. We also collect the image size. */ | |
156 | image_size = 0; | |
157 | for (f = flist; f; f = f->next) { | |
158 | for (i = 0; i < f->num_blocks; i++) { | |
159 | if (f->blocks[i].data == NULL) { | |
160 | return FLASH_IMG_NULL_DATA; | |
161 | } | |
162 | block_size = f->blocks[i].length; | |
ae883cab | 163 | if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { |
1da177e4 LT |
164 | return FLASH_IMG_BAD_LEN; |
165 | } | |
166 | image_size += block_size; | |
167 | } | |
168 | } | |
169 | ||
170 | if (image_size < (256 << 10)) { | |
171 | if (image_size < 2) | |
172 | return FLASH_NO_OP; | |
173 | } | |
174 | ||
175 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); | |
176 | ||
177 | return FLASH_IMG_READY; | |
178 | } | |
179 | ||
180 | static void free_flash_list(struct flash_block_list *f) | |
181 | { | |
182 | struct flash_block_list *next; | |
183 | int i; | |
184 | ||
185 | while (f) { | |
186 | for (i = 0; i < f->num_blocks; i++) | |
ae883cab | 187 | kmem_cache_free(flash_block_cache, f->blocks[i].data); |
1da177e4 | 188 | next = f->next; |
ae883cab | 189 | kmem_cache_free(flash_block_cache, f); |
1da177e4 LT |
190 | f = next; |
191 | } | |
192 | } | |
193 | ||
194 | static int rtas_flash_release(struct inode *inode, struct file *file) | |
195 | { | |
b4d1ab58 | 196 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
197 | struct rtas_update_flash_t *uf; |
198 | ||
199 | uf = (struct rtas_update_flash_t *) dp->data; | |
200 | if (uf->flist) { | |
201 | /* File was opened in write mode for a new flash attempt */ | |
202 | /* Clear saved list */ | |
203 | if (rtas_firmware_flash_list.next) { | |
204 | free_flash_list(rtas_firmware_flash_list.next); | |
205 | rtas_firmware_flash_list.next = NULL; | |
206 | } | |
207 | ||
208 | if (uf->status != FLASH_AUTH) | |
209 | uf->status = flash_list_valid(uf->flist); | |
210 | ||
211 | if (uf->status == FLASH_IMG_READY) | |
212 | rtas_firmware_flash_list.next = uf->flist; | |
213 | else | |
214 | free_flash_list(uf->flist); | |
215 | ||
216 | uf->flist = NULL; | |
217 | } | |
218 | ||
219 | atomic_dec(&dp->count); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static void get_flash_status_msg(int status, char *buf) | |
224 | { | |
225 | char *msg; | |
226 | ||
227 | switch (status) { | |
228 | case FLASH_AUTH: | |
229 | msg = "error: this partition does not have service authority\n"; | |
230 | break; | |
231 | case FLASH_NO_OP: | |
232 | msg = "info: no firmware image for flash\n"; | |
233 | break; | |
234 | case FLASH_IMG_SHORT: | |
235 | msg = "error: flash image short\n"; | |
236 | break; | |
237 | case FLASH_IMG_BAD_LEN: | |
238 | msg = "error: internal error bad length\n"; | |
239 | break; | |
240 | case FLASH_IMG_NULL_DATA: | |
241 | msg = "error: internal error null data\n"; | |
242 | break; | |
243 | case FLASH_IMG_READY: | |
244 | msg = "ready: firmware image ready for flash on reboot\n"; | |
245 | break; | |
246 | default: | |
247 | sprintf(buf, "error: unexpected status value %d\n", status); | |
248 | return; | |
249 | } | |
250 | ||
251 | strcpy(buf, msg); | |
252 | } | |
253 | ||
254 | /* Reading the proc file will show status (not the firmware contents) */ | |
efa54579 | 255 | static ssize_t rtas_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
256 | size_t count, loff_t *ppos) |
257 | { | |
b4d1ab58 | 258 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
259 | struct rtas_update_flash_t *uf; |
260 | char msg[RTAS_MSG_MAXLEN]; | |
261 | int msglen; | |
262 | ||
263 | uf = (struct rtas_update_flash_t *) dp->data; | |
264 | ||
265 | if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) { | |
266 | get_flash_status_msg(uf->status, msg); | |
267 | } else { /* FIRMWARE_UPDATE_NAME */ | |
268 | sprintf(msg, "%d\n", uf->status); | |
269 | } | |
270 | msglen = strlen(msg); | |
271 | if (msglen > count) | |
272 | msglen = count; | |
273 | ||
274 | if (ppos && *ppos != 0) | |
275 | return 0; /* be cheap */ | |
276 | ||
277 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
278 | return -EINVAL; | |
279 | ||
280 | if (copy_to_user(buf, msg, msglen)) | |
281 | return -EFAULT; | |
282 | ||
283 | if (ppos) | |
284 | *ppos = msglen; | |
285 | return msglen; | |
286 | } | |
287 | ||
ae883cab | 288 | /* constructor for flash_block_cache */ |
e18b890b | 289 | void rtas_block_ctor(void *ptr, struct kmem_cache *cache, unsigned long flags) |
ae883cab JR |
290 | { |
291 | memset(ptr, 0, RTAS_BLK_SIZE); | |
292 | } | |
293 | ||
1da177e4 LT |
294 | /* We could be much more efficient here. But to keep this function |
295 | * simple we allocate a page to the block list no matter how small the | |
296 | * count is. If the system is low on memory it will be just as well | |
297 | * that we fail.... | |
298 | */ | |
efa54579 | 299 | static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
300 | size_t count, loff_t *off) |
301 | { | |
b4d1ab58 | 302 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
303 | struct rtas_update_flash_t *uf; |
304 | char *p; | |
305 | int next_free; | |
306 | struct flash_block_list *fl; | |
307 | ||
308 | uf = (struct rtas_update_flash_t *) dp->data; | |
309 | ||
310 | if (uf->status == FLASH_AUTH || count == 0) | |
311 | return count; /* discard data */ | |
312 | ||
313 | /* In the case that the image is not ready for flashing, the memory | |
314 | * allocated for the block list will be freed upon the release of the | |
315 | * proc file | |
316 | */ | |
317 | if (uf->flist == NULL) { | |
ae883cab | 318 | uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); |
1da177e4 LT |
319 | if (!uf->flist) |
320 | return -ENOMEM; | |
321 | } | |
322 | ||
323 | fl = uf->flist; | |
324 | while (fl->next) | |
325 | fl = fl->next; /* seek to last block_list for append */ | |
326 | next_free = fl->num_blocks; | |
327 | if (next_free == FLASH_BLOCKS_PER_NODE) { | |
328 | /* Need to allocate another block_list */ | |
ae883cab | 329 | fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); |
1da177e4 LT |
330 | if (!fl->next) |
331 | return -ENOMEM; | |
332 | fl = fl->next; | |
333 | next_free = 0; | |
334 | } | |
335 | ||
ae883cab JR |
336 | if (count > RTAS_BLK_SIZE) |
337 | count = RTAS_BLK_SIZE; | |
338 | p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); | |
1da177e4 LT |
339 | if (!p) |
340 | return -ENOMEM; | |
341 | ||
342 | if(copy_from_user(p, buffer, count)) { | |
ae883cab | 343 | kmem_cache_free(flash_block_cache, p); |
1da177e4 LT |
344 | return -EFAULT; |
345 | } | |
346 | fl->blocks[next_free].data = p; | |
347 | fl->blocks[next_free].length = count; | |
348 | fl->num_blocks++; | |
349 | ||
350 | return count; | |
351 | } | |
352 | ||
353 | static int rtas_excl_open(struct inode *inode, struct file *file) | |
354 | { | |
355 | struct proc_dir_entry *dp = PDE(inode); | |
356 | ||
357 | /* Enforce exclusive open with use count of PDE */ | |
358 | spin_lock(&flash_file_open_lock); | |
359 | if (atomic_read(&dp->count) > 1) { | |
360 | spin_unlock(&flash_file_open_lock); | |
361 | return -EBUSY; | |
362 | } | |
363 | ||
364 | atomic_inc(&dp->count); | |
365 | spin_unlock(&flash_file_open_lock); | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static int rtas_excl_release(struct inode *inode, struct file *file) | |
371 | { | |
372 | struct proc_dir_entry *dp = PDE(inode); | |
373 | ||
374 | atomic_dec(&dp->count); | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | static void manage_flash(struct rtas_manage_flash_t *args_buf) | |
380 | { | |
1da177e4 LT |
381 | s32 rc; |
382 | ||
507279db | 383 | do { |
1da177e4 LT |
384 | rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, |
385 | 1, NULL, args_buf->op); | |
507279db | 386 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
387 | |
388 | args_buf->status = rc; | |
389 | } | |
390 | ||
efa54579 | 391 | static ssize_t manage_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
392 | size_t count, loff_t *ppos) |
393 | { | |
b4d1ab58 | 394 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
395 | struct rtas_manage_flash_t *args_buf; |
396 | char msg[RTAS_MSG_MAXLEN]; | |
397 | int msglen; | |
398 | ||
399 | args_buf = (struct rtas_manage_flash_t *) dp->data; | |
400 | if (args_buf == NULL) | |
401 | return 0; | |
402 | ||
403 | msglen = sprintf(msg, "%d\n", args_buf->status); | |
404 | if (msglen > count) | |
405 | msglen = count; | |
406 | ||
407 | if (ppos && *ppos != 0) | |
408 | return 0; /* be cheap */ | |
409 | ||
410 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
411 | return -EINVAL; | |
412 | ||
413 | if (copy_to_user(buf, msg, msglen)) | |
414 | return -EFAULT; | |
415 | ||
416 | if (ppos) | |
417 | *ppos = msglen; | |
418 | return msglen; | |
419 | } | |
420 | ||
efa54579 | 421 | static ssize_t manage_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
422 | size_t count, loff_t *off) |
423 | { | |
b4d1ab58 | 424 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
425 | struct rtas_manage_flash_t *args_buf; |
426 | const char reject_str[] = "0"; | |
427 | const char commit_str[] = "1"; | |
428 | char stkbuf[10]; | |
429 | int op; | |
430 | ||
431 | args_buf = (struct rtas_manage_flash_t *) dp->data; | |
432 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) | |
433 | return count; | |
434 | ||
435 | op = -1; | |
436 | if (buf) { | |
437 | if (count > 9) count = 9; | |
438 | if (copy_from_user (stkbuf, buf, count)) { | |
439 | return -EFAULT; | |
440 | } | |
441 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) | |
442 | op = RTAS_REJECT_TMP_IMG; | |
443 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) | |
444 | op = RTAS_COMMIT_TMP_IMG; | |
445 | } | |
446 | ||
447 | if (op == -1) /* buf is empty, or contains invalid string */ | |
448 | return -EINVAL; | |
449 | ||
450 | args_buf->op = op; | |
451 | manage_flash(args_buf); | |
452 | ||
453 | return count; | |
454 | } | |
455 | ||
456 | static void validate_flash(struct rtas_validate_flash_t *args_buf) | |
457 | { | |
458 | int token = rtas_token("ibm,validate-flash-image"); | |
1da177e4 LT |
459 | int update_results; |
460 | s32 rc; | |
461 | ||
462 | rc = 0; | |
507279db | 463 | do { |
1da177e4 LT |
464 | spin_lock(&rtas_data_buf_lock); |
465 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); | |
466 | rc = rtas_call(token, 2, 2, &update_results, | |
467 | (u32) __pa(rtas_data_buf), args_buf->buf_size); | |
468 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); | |
469 | spin_unlock(&rtas_data_buf_lock); | |
507279db | 470 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
471 | |
472 | args_buf->status = rc; | |
473 | args_buf->update_results = update_results; | |
474 | } | |
475 | ||
476 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, | |
477 | char *msg) | |
478 | { | |
479 | int n; | |
480 | ||
481 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { | |
482 | n = sprintf(msg, "%d\n", args_buf->update_results); | |
483 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || | |
484 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) | |
485 | n += sprintf(msg + n, "%s\n", args_buf->buf); | |
486 | } else { | |
487 | n = sprintf(msg, "%d\n", args_buf->status); | |
488 | } | |
489 | return n; | |
490 | } | |
491 | ||
efa54579 | 492 | static ssize_t validate_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
493 | size_t count, loff_t *ppos) |
494 | { | |
b4d1ab58 | 495 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
496 | struct rtas_validate_flash_t *args_buf; |
497 | char msg[RTAS_MSG_MAXLEN]; | |
498 | int msglen; | |
499 | ||
500 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
501 | ||
502 | if (ppos && *ppos != 0) | |
503 | return 0; /* be cheap */ | |
504 | ||
505 | msglen = get_validate_flash_msg(args_buf, msg); | |
506 | if (msglen > count) | |
507 | msglen = count; | |
508 | ||
509 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
510 | return -EINVAL; | |
511 | ||
512 | if (copy_to_user(buf, msg, msglen)) | |
513 | return -EFAULT; | |
514 | ||
515 | if (ppos) | |
516 | *ppos = msglen; | |
517 | return msglen; | |
518 | } | |
519 | ||
efa54579 | 520 | static ssize_t validate_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
521 | size_t count, loff_t *off) |
522 | { | |
b4d1ab58 | 523 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
524 | struct rtas_validate_flash_t *args_buf; |
525 | int rc; | |
526 | ||
527 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
528 | ||
529 | if (dp->data == NULL) { | |
530 | dp->data = kmalloc(sizeof(struct rtas_validate_flash_t), | |
531 | GFP_KERNEL); | |
532 | if (dp->data == NULL) | |
533 | return -ENOMEM; | |
534 | } | |
535 | ||
536 | /* We are only interested in the first 4K of the | |
537 | * candidate image */ | |
538 | if ((*off >= VALIDATE_BUF_SIZE) || | |
539 | (args_buf->status == VALIDATE_AUTH)) { | |
540 | *off += count; | |
541 | return count; | |
542 | } | |
543 | ||
544 | if (*off + count >= VALIDATE_BUF_SIZE) { | |
545 | count = VALIDATE_BUF_SIZE - *off; | |
546 | args_buf->status = VALIDATE_READY; | |
547 | } else { | |
548 | args_buf->status = VALIDATE_INCOMPLETE; | |
549 | } | |
550 | ||
551 | if (!access_ok(VERIFY_READ, buf, count)) { | |
552 | rc = -EFAULT; | |
553 | goto done; | |
554 | } | |
555 | if (copy_from_user(args_buf->buf + *off, buf, count)) { | |
556 | rc = -EFAULT; | |
557 | goto done; | |
558 | } | |
559 | ||
560 | *off += count; | |
561 | rc = count; | |
562 | done: | |
563 | if (rc < 0) { | |
564 | kfree(dp->data); | |
565 | dp->data = NULL; | |
566 | } | |
567 | return rc; | |
568 | } | |
569 | ||
570 | static int validate_flash_release(struct inode *inode, struct file *file) | |
571 | { | |
b4d1ab58 | 572 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
573 | struct rtas_validate_flash_t *args_buf; |
574 | ||
575 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
576 | ||
577 | if (args_buf->status == VALIDATE_READY) { | |
578 | args_buf->buf_size = VALIDATE_BUF_SIZE; | |
579 | validate_flash(args_buf); | |
580 | } | |
581 | ||
582 | /* The matching atomic_inc was in rtas_excl_open() */ | |
583 | atomic_dec(&dp->count); | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
f4fcbbe9 PM |
588 | static void rtas_flash_firmware(int reboot_type) |
589 | { | |
590 | unsigned long image_size; | |
591 | struct flash_block_list *f, *next, *flist; | |
592 | unsigned long rtas_block_list; | |
593 | int i, status, update_token; | |
594 | ||
595 | if (rtas_firmware_flash_list.next == NULL) | |
596 | return; /* nothing to do */ | |
597 | ||
598 | if (reboot_type != SYS_RESTART) { | |
599 | printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); | |
600 | printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); | |
601 | return; | |
602 | } | |
603 | ||
604 | update_token = rtas_token("ibm,update-flash-64-and-reboot"); | |
605 | if (update_token == RTAS_UNKNOWN_SERVICE) { | |
606 | printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " | |
607 | "is not available -- not a service partition?\n"); | |
608 | printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); | |
609 | return; | |
610 | } | |
611 | ||
612 | /* NOTE: the "first" block list is a global var with no data | |
613 | * blocks in the kernel data segment. We do this because | |
614 | * we want to ensure this block_list addr is under 4GB. | |
615 | */ | |
616 | rtas_firmware_flash_list.num_blocks = 0; | |
617 | flist = (struct flash_block_list *)&rtas_firmware_flash_list; | |
618 | rtas_block_list = virt_to_abs(flist); | |
619 | if (rtas_block_list >= 4UL*1024*1024*1024) { | |
620 | printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); | |
621 | return; | |
622 | } | |
623 | ||
624 | printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); | |
625 | /* Update the block_list in place. */ | |
626 | image_size = 0; | |
627 | for (f = flist; f; f = next) { | |
628 | /* Translate data addrs to absolute */ | |
629 | for (i = 0; i < f->num_blocks; i++) { | |
630 | f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data); | |
631 | image_size += f->blocks[i].length; | |
632 | } | |
633 | next = f->next; | |
634 | /* Don't translate NULL pointer for last entry */ | |
635 | if (f->next) | |
636 | f->next = (struct flash_block_list *)virt_to_abs(f->next); | |
637 | else | |
638 | f->next = NULL; | |
639 | /* make num_blocks into the version/length field */ | |
640 | f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); | |
641 | } | |
642 | ||
643 | printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); | |
644 | printk(KERN_ALERT "FLASH: performing flash and reboot\n"); | |
645 | rtas_progress("Flashing \n", 0x0); | |
646 | rtas_progress("Please Wait... ", 0x0); | |
647 | printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); | |
648 | status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); | |
649 | switch (status) { /* should only get "bad" status */ | |
650 | case 0: | |
651 | printk(KERN_ALERT "FLASH: success\n"); | |
652 | break; | |
653 | case -1: | |
654 | printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); | |
655 | break; | |
656 | case -3: | |
657 | printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); | |
658 | break; | |
659 | case -4: | |
660 | printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); | |
661 | break; | |
662 | default: | |
663 | printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); | |
664 | break; | |
665 | } | |
666 | } | |
667 | ||
1da177e4 LT |
668 | static void remove_flash_pde(struct proc_dir_entry *dp) |
669 | { | |
670 | if (dp) { | |
95eff20f | 671 | kfree(dp->data); |
1da177e4 LT |
672 | dp->owner = NULL; |
673 | remove_proc_entry(dp->name, dp->parent); | |
674 | } | |
675 | } | |
676 | ||
677 | static int initialize_flash_pde_data(const char *rtas_call_name, | |
678 | size_t buf_size, | |
679 | struct proc_dir_entry *dp) | |
680 | { | |
681 | int *status; | |
682 | int token; | |
683 | ||
f8485350 | 684 | dp->data = kzalloc(buf_size, GFP_KERNEL); |
1da177e4 LT |
685 | if (dp->data == NULL) { |
686 | remove_flash_pde(dp); | |
687 | return -ENOMEM; | |
688 | } | |
689 | ||
1da177e4 LT |
690 | /* |
691 | * This code assumes that the status int is the first member of the | |
692 | * struct | |
693 | */ | |
694 | status = (int *) dp->data; | |
695 | token = rtas_token(rtas_call_name); | |
696 | if (token == RTAS_UNKNOWN_SERVICE) | |
697 | *status = FLASH_AUTH; | |
698 | else | |
699 | *status = FLASH_NO_OP; | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | static struct proc_dir_entry *create_flash_pde(const char *filename, | |
5dfe4c96 | 705 | const struct file_operations *fops) |
1da177e4 LT |
706 | { |
707 | struct proc_dir_entry *ent = NULL; | |
708 | ||
709 | ent = create_proc_entry(filename, S_IRUSR | S_IWUSR, NULL); | |
710 | if (ent != NULL) { | |
1da177e4 LT |
711 | ent->proc_fops = fops; |
712 | ent->owner = THIS_MODULE; | |
713 | } | |
714 | ||
715 | return ent; | |
716 | } | |
717 | ||
5dfe4c96 | 718 | static const struct file_operations rtas_flash_operations = { |
1da177e4 LT |
719 | .read = rtas_flash_read, |
720 | .write = rtas_flash_write, | |
721 | .open = rtas_excl_open, | |
722 | .release = rtas_flash_release, | |
723 | }; | |
724 | ||
5dfe4c96 | 725 | static const struct file_operations manage_flash_operations = { |
1da177e4 LT |
726 | .read = manage_flash_read, |
727 | .write = manage_flash_write, | |
728 | .open = rtas_excl_open, | |
729 | .release = rtas_excl_release, | |
730 | }; | |
731 | ||
5dfe4c96 | 732 | static const struct file_operations validate_flash_operations = { |
1da177e4 LT |
733 | .read = validate_flash_read, |
734 | .write = validate_flash_write, | |
735 | .open = rtas_excl_open, | |
736 | .release = validate_flash_release, | |
737 | }; | |
738 | ||
739 | int __init rtas_flash_init(void) | |
740 | { | |
741 | int rc; | |
742 | ||
743 | if (rtas_token("ibm,update-flash-64-and-reboot") == | |
744 | RTAS_UNKNOWN_SERVICE) { | |
745 | printk(KERN_ERR "rtas_flash: no firmware flash support\n"); | |
746 | return 1; | |
747 | } | |
748 | ||
749 | firmware_flash_pde = create_flash_pde("ppc64/rtas/" | |
750 | FIRMWARE_FLASH_NAME, | |
751 | &rtas_flash_operations); | |
752 | if (firmware_flash_pde == NULL) { | |
753 | rc = -ENOMEM; | |
754 | goto cleanup; | |
755 | } | |
756 | ||
757 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
758 | sizeof(struct rtas_update_flash_t), | |
759 | firmware_flash_pde); | |
760 | if (rc != 0) | |
761 | goto cleanup; | |
762 | ||
763 | firmware_update_pde = create_flash_pde("ppc64/rtas/" | |
764 | FIRMWARE_UPDATE_NAME, | |
765 | &rtas_flash_operations); | |
766 | if (firmware_update_pde == NULL) { | |
767 | rc = -ENOMEM; | |
768 | goto cleanup; | |
769 | } | |
770 | ||
771 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
772 | sizeof(struct rtas_update_flash_t), | |
773 | firmware_update_pde); | |
774 | if (rc != 0) | |
775 | goto cleanup; | |
776 | ||
777 | validate_pde = create_flash_pde("ppc64/rtas/" VALIDATE_FLASH_NAME, | |
778 | &validate_flash_operations); | |
779 | if (validate_pde == NULL) { | |
780 | rc = -ENOMEM; | |
781 | goto cleanup; | |
782 | } | |
783 | ||
784 | rc = initialize_flash_pde_data("ibm,validate-flash-image", | |
785 | sizeof(struct rtas_validate_flash_t), | |
786 | validate_pde); | |
787 | if (rc != 0) | |
788 | goto cleanup; | |
789 | ||
790 | manage_pde = create_flash_pde("ppc64/rtas/" MANAGE_FLASH_NAME, | |
791 | &manage_flash_operations); | |
792 | if (manage_pde == NULL) { | |
793 | rc = -ENOMEM; | |
794 | goto cleanup; | |
795 | } | |
796 | ||
797 | rc = initialize_flash_pde_data("ibm,manage-flash-image", | |
798 | sizeof(struct rtas_manage_flash_t), | |
799 | manage_pde); | |
800 | if (rc != 0) | |
801 | goto cleanup; | |
802 | ||
f4fcbbe9 | 803 | rtas_flash_term_hook = rtas_flash_firmware; |
ae883cab JR |
804 | |
805 | flash_block_cache = kmem_cache_create("rtas_flash_cache", | |
806 | RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0, | |
20c2df83 | 807 | rtas_block_ctor); |
ae883cab JR |
808 | if (!flash_block_cache) { |
809 | printk(KERN_ERR "%s: failed to create block cache\n", | |
810 | __FUNCTION__); | |
811 | rc = -ENOMEM; | |
812 | goto cleanup; | |
813 | } | |
1da177e4 LT |
814 | return 0; |
815 | ||
816 | cleanup: | |
817 | remove_flash_pde(firmware_flash_pde); | |
818 | remove_flash_pde(firmware_update_pde); | |
819 | remove_flash_pde(validate_pde); | |
820 | remove_flash_pde(manage_pde); | |
821 | ||
822 | return rc; | |
823 | } | |
824 | ||
825 | void __exit rtas_flash_cleanup(void) | |
826 | { | |
f4fcbbe9 | 827 | rtas_flash_term_hook = NULL; |
ae883cab JR |
828 | |
829 | if (flash_block_cache) | |
830 | kmem_cache_destroy(flash_block_cache); | |
831 | ||
1da177e4 LT |
832 | remove_flash_pde(firmware_flash_pde); |
833 | remove_flash_pde(firmware_update_pde); | |
834 | remove_flash_pde(validate_pde); | |
835 | remove_flash_pde(manage_pde); | |
836 | } | |
837 | ||
838 | module_init(rtas_flash_init); | |
839 | module_exit(rtas_flash_cleanup); | |
840 | MODULE_LICENSE("GPL"); |