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 LT |
19 | #include <linux/proc_fs.h> |
20 | #include <asm/delay.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/rtas.h> | |
f4fcbbe9 | 23 | #include <asm/abs_addr.h> |
1da177e4 LT |
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 */ | |
60 | #define VALIDATE_TMP_UPDATE 0 /* Validate Return Status */ | |
61 | #define VALIDATE_FLASH_AUTH 1 /* Validate Return Status */ | |
62 | #define VALIDATE_INVALID_IMG 2 /* Validate Return Status */ | |
63 | #define VALIDATE_CUR_UNKNOWN 3 /* Validate Return Status */ | |
64 | #define VALIDATE_TMP_COMMIT_DL 4 /* Validate Return Status */ | |
65 | #define VALIDATE_TMP_COMMIT 5 /* Validate Return Status */ | |
66 | #define VALIDATE_TMP_UPDATE_DL 6 /* Validate Return Status */ | |
67 | ||
68 | /* ibm,manage-flash-image operation tokens */ | |
69 | #define RTAS_REJECT_TMP_IMG 0 | |
70 | #define RTAS_COMMIT_TMP_IMG 1 | |
71 | ||
72 | /* Array sizes */ | |
73 | #define VALIDATE_BUF_SIZE 4096 | |
74 | #define RTAS_MSG_MAXLEN 64 | |
75 | ||
ae883cab JR |
76 | /* Quirk - RTAS requires 4k list length and block size */ |
77 | #define RTAS_BLKLIST_LENGTH 4096 | |
78 | #define RTAS_BLK_SIZE 4096 | |
79 | ||
f4fcbbe9 PM |
80 | struct flash_block { |
81 | char *data; | |
82 | unsigned long length; | |
83 | }; | |
84 | ||
85 | /* This struct is very similar but not identical to | |
86 | * that needed by the rtas flash update. | |
87 | * All we need to do for rtas is rewrite num_blocks | |
88 | * into a version/length and translate the pointers | |
89 | * to absolute. | |
90 | */ | |
ae883cab | 91 | #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) |
f4fcbbe9 PM |
92 | struct flash_block_list { |
93 | unsigned long num_blocks; | |
94 | struct flash_block_list *next; | |
95 | struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; | |
96 | }; | |
f4fcbbe9 | 97 | |
bd2b64a1 | 98 | static struct flash_block_list *rtas_firmware_flash_list; |
f4fcbbe9 | 99 | |
ae883cab | 100 | /* Use slab cache to guarantee 4k alignment */ |
e18b890b | 101 | static struct kmem_cache *flash_block_cache = NULL; |
ae883cab | 102 | |
f4fcbbe9 PM |
103 | #define FLASH_BLOCK_LIST_VERSION (1UL) |
104 | ||
1da177e4 LT |
105 | /* Local copy of the flash block list. |
106 | * We only allow one open of the flash proc file and create this | |
bd2b64a1 MM |
107 | * list as we go. The rtas_firmware_flash_list varable will be |
108 | * set once the data is fully read. | |
1da177e4 LT |
109 | * |
110 | * For convenience as we build the list we use virtual addrs, | |
111 | * we do not fill in the version number, and the length field | |
112 | * is treated as the number of entries currently in the block | |
bd2b64a1 MM |
113 | * (i.e. not a byte count). This is all fixed when calling |
114 | * the flash routine. | |
1da177e4 LT |
115 | */ |
116 | ||
117 | /* Status int must be first member of struct */ | |
118 | struct rtas_update_flash_t | |
119 | { | |
120 | int status; /* Flash update status */ | |
121 | struct flash_block_list *flist; /* Local copy of flash block list */ | |
122 | }; | |
123 | ||
124 | /* Status int must be first member of struct */ | |
125 | struct rtas_manage_flash_t | |
126 | { | |
127 | int status; /* Returned status */ | |
128 | unsigned int op; /* Reject or commit image */ | |
129 | }; | |
130 | ||
131 | /* Status int must be first member of struct */ | |
132 | struct rtas_validate_flash_t | |
133 | { | |
134 | int status; /* Returned status */ | |
135 | char buf[VALIDATE_BUF_SIZE]; /* Candidate image buffer */ | |
136 | unsigned int buf_size; /* Size of image buf */ | |
137 | unsigned int update_results; /* Update results token */ | |
138 | }; | |
139 | ||
140 | static DEFINE_SPINLOCK(flash_file_open_lock); | |
141 | static struct proc_dir_entry *firmware_flash_pde; | |
142 | static struct proc_dir_entry *firmware_update_pde; | |
143 | static struct proc_dir_entry *validate_pde; | |
144 | static struct proc_dir_entry *manage_pde; | |
145 | ||
146 | /* Do simple sanity checks on the flash image. */ | |
147 | static int flash_list_valid(struct flash_block_list *flist) | |
148 | { | |
149 | struct flash_block_list *f; | |
150 | int i; | |
151 | unsigned long block_size, image_size; | |
152 | ||
153 | /* Paranoid self test here. We also collect the image size. */ | |
154 | image_size = 0; | |
155 | for (f = flist; f; f = f->next) { | |
156 | for (i = 0; i < f->num_blocks; i++) { | |
157 | if (f->blocks[i].data == NULL) { | |
158 | return FLASH_IMG_NULL_DATA; | |
159 | } | |
160 | block_size = f->blocks[i].length; | |
ae883cab | 161 | if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { |
1da177e4 LT |
162 | return FLASH_IMG_BAD_LEN; |
163 | } | |
164 | image_size += block_size; | |
165 | } | |
166 | } | |
167 | ||
168 | if (image_size < (256 << 10)) { | |
169 | if (image_size < 2) | |
170 | return FLASH_NO_OP; | |
171 | } | |
172 | ||
173 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); | |
174 | ||
175 | return FLASH_IMG_READY; | |
176 | } | |
177 | ||
178 | static void free_flash_list(struct flash_block_list *f) | |
179 | { | |
180 | struct flash_block_list *next; | |
181 | int i; | |
182 | ||
183 | while (f) { | |
184 | for (i = 0; i < f->num_blocks; i++) | |
ae883cab | 185 | kmem_cache_free(flash_block_cache, f->blocks[i].data); |
1da177e4 | 186 | next = f->next; |
ae883cab | 187 | kmem_cache_free(flash_block_cache, f); |
1da177e4 LT |
188 | f = next; |
189 | } | |
190 | } | |
191 | ||
192 | static int rtas_flash_release(struct inode *inode, struct file *file) | |
193 | { | |
b4d1ab58 | 194 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
195 | struct rtas_update_flash_t *uf; |
196 | ||
197 | uf = (struct rtas_update_flash_t *) dp->data; | |
198 | if (uf->flist) { | |
199 | /* File was opened in write mode for a new flash attempt */ | |
200 | /* Clear saved list */ | |
bd2b64a1 MM |
201 | if (rtas_firmware_flash_list) { |
202 | free_flash_list(rtas_firmware_flash_list); | |
203 | rtas_firmware_flash_list = NULL; | |
1da177e4 LT |
204 | } |
205 | ||
206 | if (uf->status != FLASH_AUTH) | |
207 | uf->status = flash_list_valid(uf->flist); | |
208 | ||
209 | if (uf->status == FLASH_IMG_READY) | |
bd2b64a1 | 210 | rtas_firmware_flash_list = uf->flist; |
1da177e4 LT |
211 | else |
212 | free_flash_list(uf->flist); | |
213 | ||
214 | uf->flist = NULL; | |
215 | } | |
216 | ||
217 | atomic_dec(&dp->count); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static void get_flash_status_msg(int status, char *buf) | |
222 | { | |
223 | char *msg; | |
224 | ||
225 | switch (status) { | |
226 | case FLASH_AUTH: | |
227 | msg = "error: this partition does not have service authority\n"; | |
228 | break; | |
229 | case FLASH_NO_OP: | |
230 | msg = "info: no firmware image for flash\n"; | |
231 | break; | |
232 | case FLASH_IMG_SHORT: | |
233 | msg = "error: flash image short\n"; | |
234 | break; | |
235 | case FLASH_IMG_BAD_LEN: | |
236 | msg = "error: internal error bad length\n"; | |
237 | break; | |
238 | case FLASH_IMG_NULL_DATA: | |
239 | msg = "error: internal error null data\n"; | |
240 | break; | |
241 | case FLASH_IMG_READY: | |
242 | msg = "ready: firmware image ready for flash on reboot\n"; | |
243 | break; | |
244 | default: | |
245 | sprintf(buf, "error: unexpected status value %d\n", status); | |
246 | return; | |
247 | } | |
248 | ||
249 | strcpy(buf, msg); | |
250 | } | |
251 | ||
252 | /* Reading the proc file will show status (not the firmware contents) */ | |
efa54579 | 253 | static ssize_t rtas_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
254 | size_t count, loff_t *ppos) |
255 | { | |
b4d1ab58 | 256 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
257 | struct rtas_update_flash_t *uf; |
258 | char msg[RTAS_MSG_MAXLEN]; | |
259 | int msglen; | |
260 | ||
261 | uf = (struct rtas_update_flash_t *) dp->data; | |
262 | ||
263 | if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) { | |
264 | get_flash_status_msg(uf->status, msg); | |
265 | } else { /* FIRMWARE_UPDATE_NAME */ | |
266 | sprintf(msg, "%d\n", uf->status); | |
267 | } | |
268 | msglen = strlen(msg); | |
269 | if (msglen > count) | |
270 | msglen = count; | |
271 | ||
272 | if (ppos && *ppos != 0) | |
273 | return 0; /* be cheap */ | |
274 | ||
275 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
276 | return -EINVAL; | |
277 | ||
278 | if (copy_to_user(buf, msg, msglen)) | |
279 | return -EFAULT; | |
280 | ||
281 | if (ppos) | |
282 | *ppos = msglen; | |
283 | return msglen; | |
284 | } | |
285 | ||
ae883cab | 286 | /* constructor for flash_block_cache */ |
51cc5068 | 287 | void rtas_block_ctor(void *ptr) |
ae883cab JR |
288 | { |
289 | memset(ptr, 0, RTAS_BLK_SIZE); | |
290 | } | |
291 | ||
1da177e4 LT |
292 | /* We could be much more efficient here. But to keep this function |
293 | * simple we allocate a page to the block list no matter how small the | |
294 | * count is. If the system is low on memory it will be just as well | |
295 | * that we fail.... | |
296 | */ | |
efa54579 | 297 | static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
298 | size_t count, loff_t *off) |
299 | { | |
b4d1ab58 | 300 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
301 | struct rtas_update_flash_t *uf; |
302 | char *p; | |
303 | int next_free; | |
304 | struct flash_block_list *fl; | |
305 | ||
306 | uf = (struct rtas_update_flash_t *) dp->data; | |
307 | ||
308 | if (uf->status == FLASH_AUTH || count == 0) | |
309 | return count; /* discard data */ | |
310 | ||
311 | /* In the case that the image is not ready for flashing, the memory | |
312 | * allocated for the block list will be freed upon the release of the | |
313 | * proc file | |
314 | */ | |
315 | if (uf->flist == NULL) { | |
ae883cab | 316 | uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); |
1da177e4 LT |
317 | if (!uf->flist) |
318 | return -ENOMEM; | |
319 | } | |
320 | ||
321 | fl = uf->flist; | |
322 | while (fl->next) | |
323 | fl = fl->next; /* seek to last block_list for append */ | |
324 | next_free = fl->num_blocks; | |
325 | if (next_free == FLASH_BLOCKS_PER_NODE) { | |
326 | /* Need to allocate another block_list */ | |
ae883cab | 327 | fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); |
1da177e4 LT |
328 | if (!fl->next) |
329 | return -ENOMEM; | |
330 | fl = fl->next; | |
331 | next_free = 0; | |
332 | } | |
333 | ||
ae883cab JR |
334 | if (count > RTAS_BLK_SIZE) |
335 | count = RTAS_BLK_SIZE; | |
336 | p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); | |
1da177e4 LT |
337 | if (!p) |
338 | return -ENOMEM; | |
339 | ||
340 | if(copy_from_user(p, buffer, count)) { | |
ae883cab | 341 | kmem_cache_free(flash_block_cache, p); |
1da177e4 LT |
342 | return -EFAULT; |
343 | } | |
344 | fl->blocks[next_free].data = p; | |
345 | fl->blocks[next_free].length = count; | |
346 | fl->num_blocks++; | |
347 | ||
348 | return count; | |
349 | } | |
350 | ||
351 | static int rtas_excl_open(struct inode *inode, struct file *file) | |
352 | { | |
353 | struct proc_dir_entry *dp = PDE(inode); | |
354 | ||
355 | /* Enforce exclusive open with use count of PDE */ | |
356 | spin_lock(&flash_file_open_lock); | |
74848398 | 357 | if (atomic_read(&dp->count) > 2) { |
1da177e4 LT |
358 | spin_unlock(&flash_file_open_lock); |
359 | return -EBUSY; | |
360 | } | |
361 | ||
362 | atomic_inc(&dp->count); | |
363 | spin_unlock(&flash_file_open_lock); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int rtas_excl_release(struct inode *inode, struct file *file) | |
369 | { | |
370 | struct proc_dir_entry *dp = PDE(inode); | |
371 | ||
372 | atomic_dec(&dp->count); | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | static void manage_flash(struct rtas_manage_flash_t *args_buf) | |
378 | { | |
1da177e4 LT |
379 | s32 rc; |
380 | ||
507279db | 381 | do { |
1da177e4 LT |
382 | rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, |
383 | 1, NULL, args_buf->op); | |
507279db | 384 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
385 | |
386 | args_buf->status = rc; | |
387 | } | |
388 | ||
efa54579 | 389 | static ssize_t manage_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
390 | size_t count, loff_t *ppos) |
391 | { | |
b4d1ab58 | 392 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
393 | struct rtas_manage_flash_t *args_buf; |
394 | char msg[RTAS_MSG_MAXLEN]; | |
395 | int msglen; | |
396 | ||
397 | args_buf = (struct rtas_manage_flash_t *) dp->data; | |
398 | if (args_buf == NULL) | |
399 | return 0; | |
400 | ||
401 | msglen = sprintf(msg, "%d\n", args_buf->status); | |
402 | if (msglen > count) | |
403 | msglen = count; | |
404 | ||
405 | if (ppos && *ppos != 0) | |
406 | return 0; /* be cheap */ | |
407 | ||
408 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
409 | return -EINVAL; | |
410 | ||
411 | if (copy_to_user(buf, msg, msglen)) | |
412 | return -EFAULT; | |
413 | ||
414 | if (ppos) | |
415 | *ppos = msglen; | |
416 | return msglen; | |
417 | } | |
418 | ||
efa54579 | 419 | static ssize_t manage_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
420 | size_t count, loff_t *off) |
421 | { | |
b4d1ab58 | 422 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
423 | struct rtas_manage_flash_t *args_buf; |
424 | const char reject_str[] = "0"; | |
425 | const char commit_str[] = "1"; | |
426 | char stkbuf[10]; | |
427 | int op; | |
428 | ||
429 | args_buf = (struct rtas_manage_flash_t *) dp->data; | |
430 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) | |
431 | return count; | |
432 | ||
433 | op = -1; | |
434 | if (buf) { | |
435 | if (count > 9) count = 9; | |
436 | if (copy_from_user (stkbuf, buf, count)) { | |
437 | return -EFAULT; | |
438 | } | |
439 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) | |
440 | op = RTAS_REJECT_TMP_IMG; | |
441 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) | |
442 | op = RTAS_COMMIT_TMP_IMG; | |
443 | } | |
444 | ||
445 | if (op == -1) /* buf is empty, or contains invalid string */ | |
446 | return -EINVAL; | |
447 | ||
448 | args_buf->op = op; | |
449 | manage_flash(args_buf); | |
450 | ||
451 | return count; | |
452 | } | |
453 | ||
454 | static void validate_flash(struct rtas_validate_flash_t *args_buf) | |
455 | { | |
456 | int token = rtas_token("ibm,validate-flash-image"); | |
1da177e4 LT |
457 | int update_results; |
458 | s32 rc; | |
459 | ||
460 | rc = 0; | |
507279db | 461 | do { |
1da177e4 LT |
462 | spin_lock(&rtas_data_buf_lock); |
463 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); | |
464 | rc = rtas_call(token, 2, 2, &update_results, | |
465 | (u32) __pa(rtas_data_buf), args_buf->buf_size); | |
466 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); | |
467 | spin_unlock(&rtas_data_buf_lock); | |
507279db | 468 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
469 | |
470 | args_buf->status = rc; | |
471 | args_buf->update_results = update_results; | |
472 | } | |
473 | ||
474 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, | |
475 | char *msg) | |
476 | { | |
477 | int n; | |
478 | ||
479 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { | |
480 | n = sprintf(msg, "%d\n", args_buf->update_results); | |
481 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || | |
482 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) | |
483 | n += sprintf(msg + n, "%s\n", args_buf->buf); | |
484 | } else { | |
485 | n = sprintf(msg, "%d\n", args_buf->status); | |
486 | } | |
487 | return n; | |
488 | } | |
489 | ||
efa54579 | 490 | static ssize_t validate_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
491 | size_t count, loff_t *ppos) |
492 | { | |
b4d1ab58 | 493 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
494 | struct rtas_validate_flash_t *args_buf; |
495 | char msg[RTAS_MSG_MAXLEN]; | |
496 | int msglen; | |
497 | ||
498 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
499 | ||
500 | if (ppos && *ppos != 0) | |
501 | return 0; /* be cheap */ | |
502 | ||
503 | msglen = get_validate_flash_msg(args_buf, msg); | |
504 | if (msglen > count) | |
505 | msglen = count; | |
506 | ||
507 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | |
508 | return -EINVAL; | |
509 | ||
510 | if (copy_to_user(buf, msg, msglen)) | |
511 | return -EFAULT; | |
512 | ||
513 | if (ppos) | |
514 | *ppos = msglen; | |
515 | return msglen; | |
516 | } | |
517 | ||
efa54579 | 518 | static ssize_t validate_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
519 | size_t count, loff_t *off) |
520 | { | |
b4d1ab58 | 521 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
522 | struct rtas_validate_flash_t *args_buf; |
523 | int rc; | |
524 | ||
525 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
526 | ||
527 | if (dp->data == NULL) { | |
528 | dp->data = kmalloc(sizeof(struct rtas_validate_flash_t), | |
529 | GFP_KERNEL); | |
530 | if (dp->data == NULL) | |
531 | return -ENOMEM; | |
532 | } | |
533 | ||
534 | /* We are only interested in the first 4K of the | |
535 | * candidate image */ | |
536 | if ((*off >= VALIDATE_BUF_SIZE) || | |
537 | (args_buf->status == VALIDATE_AUTH)) { | |
538 | *off += count; | |
539 | return count; | |
540 | } | |
541 | ||
542 | if (*off + count >= VALIDATE_BUF_SIZE) { | |
543 | count = VALIDATE_BUF_SIZE - *off; | |
544 | args_buf->status = VALIDATE_READY; | |
545 | } else { | |
546 | args_buf->status = VALIDATE_INCOMPLETE; | |
547 | } | |
548 | ||
549 | if (!access_ok(VERIFY_READ, buf, count)) { | |
550 | rc = -EFAULT; | |
551 | goto done; | |
552 | } | |
553 | if (copy_from_user(args_buf->buf + *off, buf, count)) { | |
554 | rc = -EFAULT; | |
555 | goto done; | |
556 | } | |
557 | ||
558 | *off += count; | |
559 | rc = count; | |
560 | done: | |
561 | if (rc < 0) { | |
562 | kfree(dp->data); | |
563 | dp->data = NULL; | |
564 | } | |
565 | return rc; | |
566 | } | |
567 | ||
568 | static int validate_flash_release(struct inode *inode, struct file *file) | |
569 | { | |
b4d1ab58 | 570 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
571 | struct rtas_validate_flash_t *args_buf; |
572 | ||
573 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
574 | ||
575 | if (args_buf->status == VALIDATE_READY) { | |
576 | args_buf->buf_size = VALIDATE_BUF_SIZE; | |
577 | validate_flash(args_buf); | |
578 | } | |
579 | ||
580 | /* The matching atomic_inc was in rtas_excl_open() */ | |
581 | atomic_dec(&dp->count); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
f4fcbbe9 PM |
586 | static void rtas_flash_firmware(int reboot_type) |
587 | { | |
588 | unsigned long image_size; | |
589 | struct flash_block_list *f, *next, *flist; | |
590 | unsigned long rtas_block_list; | |
591 | int i, status, update_token; | |
592 | ||
bd2b64a1 | 593 | if (rtas_firmware_flash_list == NULL) |
f4fcbbe9 PM |
594 | return; /* nothing to do */ |
595 | ||
596 | if (reboot_type != SYS_RESTART) { | |
597 | printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); | |
598 | printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); | |
599 | return; | |
600 | } | |
601 | ||
602 | update_token = rtas_token("ibm,update-flash-64-and-reboot"); | |
603 | if (update_token == RTAS_UNKNOWN_SERVICE) { | |
604 | printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " | |
605 | "is not available -- not a service partition?\n"); | |
606 | printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); | |
607 | return; | |
608 | } | |
609 | ||
bd2b64a1 MM |
610 | /* |
611 | * NOTE: the "first" block must be under 4GB, so we create | |
612 | * an entry with no data blocks in the reserved buffer in | |
613 | * the kernel data segment. | |
f4fcbbe9 | 614 | */ |
bd2b64a1 MM |
615 | spin_lock(&rtas_data_buf_lock); |
616 | flist = (struct flash_block_list *)&rtas_data_buf[0]; | |
617 | flist->num_blocks = 0; | |
618 | flist->next = rtas_firmware_flash_list; | |
f4fcbbe9 PM |
619 | rtas_block_list = virt_to_abs(flist); |
620 | if (rtas_block_list >= 4UL*1024*1024*1024) { | |
621 | printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); | |
bd2b64a1 | 622 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
623 | return; |
624 | } | |
625 | ||
626 | printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); | |
627 | /* Update the block_list in place. */ | |
bd2b64a1 | 628 | rtas_firmware_flash_list = NULL; /* too hard to backout on error */ |
f4fcbbe9 PM |
629 | image_size = 0; |
630 | for (f = flist; f; f = next) { | |
631 | /* Translate data addrs to absolute */ | |
632 | for (i = 0; i < f->num_blocks; i++) { | |
633 | f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data); | |
634 | image_size += f->blocks[i].length; | |
635 | } | |
636 | next = f->next; | |
637 | /* Don't translate NULL pointer for last entry */ | |
638 | if (f->next) | |
639 | f->next = (struct flash_block_list *)virt_to_abs(f->next); | |
640 | else | |
641 | f->next = NULL; | |
642 | /* make num_blocks into the version/length field */ | |
643 | f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); | |
644 | } | |
645 | ||
646 | printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); | |
647 | printk(KERN_ALERT "FLASH: performing flash and reboot\n"); | |
648 | rtas_progress("Flashing \n", 0x0); | |
649 | rtas_progress("Please Wait... ", 0x0); | |
650 | printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); | |
651 | status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); | |
652 | switch (status) { /* should only get "bad" status */ | |
653 | case 0: | |
654 | printk(KERN_ALERT "FLASH: success\n"); | |
655 | break; | |
656 | case -1: | |
657 | printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); | |
658 | break; | |
659 | case -3: | |
660 | printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); | |
661 | break; | |
662 | case -4: | |
663 | printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); | |
664 | break; | |
665 | default: | |
666 | printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); | |
667 | break; | |
668 | } | |
bd2b64a1 | 669 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
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 | remove_proc_entry(dp->name, dp->parent); |
677 | } | |
678 | } | |
679 | ||
680 | static int initialize_flash_pde_data(const char *rtas_call_name, | |
681 | size_t buf_size, | |
682 | struct proc_dir_entry *dp) | |
683 | { | |
684 | int *status; | |
685 | int token; | |
686 | ||
f8485350 | 687 | dp->data = kzalloc(buf_size, GFP_KERNEL); |
1da177e4 LT |
688 | if (dp->data == NULL) { |
689 | remove_flash_pde(dp); | |
690 | return -ENOMEM; | |
691 | } | |
692 | ||
1da177e4 LT |
693 | /* |
694 | * This code assumes that the status int is the first member of the | |
695 | * struct | |
696 | */ | |
697 | status = (int *) dp->data; | |
698 | token = rtas_token(rtas_call_name); | |
699 | if (token == RTAS_UNKNOWN_SERVICE) | |
700 | *status = FLASH_AUTH; | |
701 | else | |
702 | *status = FLASH_NO_OP; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | static struct proc_dir_entry *create_flash_pde(const char *filename, | |
5dfe4c96 | 708 | const struct file_operations *fops) |
1da177e4 | 709 | { |
66747138 | 710 | return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops); |
1da177e4 LT |
711 | } |
712 | ||
5dfe4c96 | 713 | static const struct file_operations rtas_flash_operations = { |
66747138 | 714 | .owner = THIS_MODULE, |
1da177e4 LT |
715 | .read = rtas_flash_read, |
716 | .write = rtas_flash_write, | |
717 | .open = rtas_excl_open, | |
718 | .release = rtas_flash_release, | |
719 | }; | |
720 | ||
5dfe4c96 | 721 | static const struct file_operations manage_flash_operations = { |
66747138 | 722 | .owner = THIS_MODULE, |
1da177e4 LT |
723 | .read = manage_flash_read, |
724 | .write = manage_flash_write, | |
725 | .open = rtas_excl_open, | |
726 | .release = rtas_excl_release, | |
727 | }; | |
728 | ||
5dfe4c96 | 729 | static const struct file_operations validate_flash_operations = { |
66747138 | 730 | .owner = THIS_MODULE, |
1da177e4 LT |
731 | .read = validate_flash_read, |
732 | .write = validate_flash_write, | |
733 | .open = rtas_excl_open, | |
734 | .release = validate_flash_release, | |
735 | }; | |
736 | ||
1c21a293 | 737 | static int __init rtas_flash_init(void) |
1da177e4 LT |
738 | { |
739 | int rc; | |
740 | ||
741 | if (rtas_token("ibm,update-flash-64-and-reboot") == | |
742 | RTAS_UNKNOWN_SERVICE) { | |
743 | printk(KERN_ERR "rtas_flash: no firmware flash support\n"); | |
744 | return 1; | |
745 | } | |
746 | ||
188917e1 | 747 | firmware_flash_pde = create_flash_pde("powerpc/rtas/" |
1da177e4 LT |
748 | FIRMWARE_FLASH_NAME, |
749 | &rtas_flash_operations); | |
750 | if (firmware_flash_pde == NULL) { | |
751 | rc = -ENOMEM; | |
752 | goto cleanup; | |
753 | } | |
754 | ||
755 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
756 | sizeof(struct rtas_update_flash_t), | |
757 | firmware_flash_pde); | |
758 | if (rc != 0) | |
759 | goto cleanup; | |
760 | ||
188917e1 | 761 | firmware_update_pde = create_flash_pde("powerpc/rtas/" |
1da177e4 LT |
762 | FIRMWARE_UPDATE_NAME, |
763 | &rtas_flash_operations); | |
764 | if (firmware_update_pde == NULL) { | |
765 | rc = -ENOMEM; | |
766 | goto cleanup; | |
767 | } | |
768 | ||
769 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
770 | sizeof(struct rtas_update_flash_t), | |
771 | firmware_update_pde); | |
772 | if (rc != 0) | |
773 | goto cleanup; | |
774 | ||
188917e1 | 775 | validate_pde = create_flash_pde("powerpc/rtas/" VALIDATE_FLASH_NAME, |
1da177e4 LT |
776 | &validate_flash_operations); |
777 | if (validate_pde == NULL) { | |
778 | rc = -ENOMEM; | |
779 | goto cleanup; | |
780 | } | |
781 | ||
782 | rc = initialize_flash_pde_data("ibm,validate-flash-image", | |
783 | sizeof(struct rtas_validate_flash_t), | |
784 | validate_pde); | |
785 | if (rc != 0) | |
786 | goto cleanup; | |
787 | ||
188917e1 | 788 | manage_pde = create_flash_pde("powerpc/rtas/" MANAGE_FLASH_NAME, |
1da177e4 LT |
789 | &manage_flash_operations); |
790 | if (manage_pde == NULL) { | |
791 | rc = -ENOMEM; | |
792 | goto cleanup; | |
793 | } | |
794 | ||
795 | rc = initialize_flash_pde_data("ibm,manage-flash-image", | |
796 | sizeof(struct rtas_manage_flash_t), | |
797 | manage_pde); | |
798 | if (rc != 0) | |
799 | goto cleanup; | |
800 | ||
f4fcbbe9 | 801 | rtas_flash_term_hook = rtas_flash_firmware; |
ae883cab JR |
802 | |
803 | flash_block_cache = kmem_cache_create("rtas_flash_cache", | |
804 | RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0, | |
20c2df83 | 805 | rtas_block_ctor); |
ae883cab JR |
806 | if (!flash_block_cache) { |
807 | printk(KERN_ERR "%s: failed to create block cache\n", | |
e48b1b45 | 808 | __func__); |
ae883cab JR |
809 | rc = -ENOMEM; |
810 | goto cleanup; | |
811 | } | |
1da177e4 LT |
812 | return 0; |
813 | ||
814 | cleanup: | |
815 | remove_flash_pde(firmware_flash_pde); | |
816 | remove_flash_pde(firmware_update_pde); | |
817 | remove_flash_pde(validate_pde); | |
818 | remove_flash_pde(manage_pde); | |
819 | ||
820 | return rc; | |
821 | } | |
822 | ||
1c21a293 | 823 | static void __exit rtas_flash_cleanup(void) |
1da177e4 | 824 | { |
f4fcbbe9 | 825 | rtas_flash_term_hook = NULL; |
ae883cab JR |
826 | |
827 | if (flash_block_cache) | |
828 | kmem_cache_destroy(flash_block_cache); | |
829 | ||
1da177e4 LT |
830 | remove_flash_pde(firmware_flash_pde); |
831 | remove_flash_pde(firmware_update_pde); | |
832 | remove_flash_pde(validate_pde); | |
833 | remove_flash_pde(manage_pde); | |
834 | } | |
835 | ||
836 | module_init(rtas_flash_init); | |
837 | module_exit(rtas_flash_cleanup); | |
838 | MODULE_LICENSE("GPL"); |