diff options
Diffstat (limited to 'arch/ppc64/kernel/rtas_flash.c')
-rw-r--r-- | arch/ppc64/kernel/rtas_flash.c | 725 |
1 files changed, 725 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/rtas_flash.c b/arch/ppc64/kernel/rtas_flash.c new file mode 100644 index 000000000000..3213837282ca --- /dev/null +++ b/arch/ppc64/kernel/rtas_flash.c | |||
@@ -0,0 +1,725 @@ | |||
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> | ||
22 | |||
23 | #define MODULE_VERS "1.0" | ||
24 | #define MODULE_NAME "rtas_flash" | ||
25 | |||
26 | #define FIRMWARE_FLASH_NAME "firmware_flash" | ||
27 | #define FIRMWARE_UPDATE_NAME "firmware_update" | ||
28 | #define MANAGE_FLASH_NAME "manage_flash" | ||
29 | #define VALIDATE_FLASH_NAME "validate_flash" | ||
30 | |||
31 | /* General RTAS Status Codes */ | ||
32 | #define RTAS_RC_SUCCESS 0 | ||
33 | #define RTAS_RC_HW_ERR -1 | ||
34 | #define RTAS_RC_BUSY -2 | ||
35 | |||
36 | /* Flash image status values */ | ||
37 | #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ | ||
38 | #define FLASH_NO_OP -1099 /* No operation initiated by user */ | ||
39 | #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ | ||
40 | #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ | ||
41 | #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ | ||
42 | #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ | ||
43 | |||
44 | /* Manage image status values */ | ||
45 | #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ | ||
46 | #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ | ||
47 | #define MANAGE_NO_OP -1099 /* No operation initiated by user */ | ||
48 | #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ | ||
49 | #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ | ||
50 | |||
51 | /* Validate image status values */ | ||
52 | #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ | ||
53 | #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ | ||
54 | #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ | ||
55 | #define VALIDATE_READY -1001 /* Firmware image ready for validation */ | ||
56 | #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ | ||
57 | #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ | ||
58 | #define VALIDATE_TMP_UPDATE 0 /* Validate Return Status */ | ||
59 | #define VALIDATE_FLASH_AUTH 1 /* Validate Return Status */ | ||
60 | #define VALIDATE_INVALID_IMG 2 /* Validate Return Status */ | ||
61 | #define VALIDATE_CUR_UNKNOWN 3 /* Validate Return Status */ | ||
62 | #define VALIDATE_TMP_COMMIT_DL 4 /* Validate Return Status */ | ||
63 | #define VALIDATE_TMP_COMMIT 5 /* Validate Return Status */ | ||
64 | #define VALIDATE_TMP_UPDATE_DL 6 /* Validate Return Status */ | ||
65 | |||
66 | /* ibm,manage-flash-image operation tokens */ | ||
67 | #define RTAS_REJECT_TMP_IMG 0 | ||
68 | #define RTAS_COMMIT_TMP_IMG 1 | ||
69 | |||
70 | /* Array sizes */ | ||
71 | #define VALIDATE_BUF_SIZE 4096 | ||
72 | #define RTAS_MSG_MAXLEN 64 | ||
73 | |||
74 | /* Local copy of the flash block list. | ||
75 | * We only allow one open of the flash proc file and create this | ||
76 | * list as we go. This list will be put in the kernel's | ||
77 | * rtas_firmware_flash_list global var once it is fully read. | ||
78 | * | ||
79 | * For convenience as we build the list we use virtual addrs, | ||
80 | * we do not fill in the version number, and the length field | ||
81 | * is treated as the number of entries currently in the block | ||
82 | * (i.e. not a byte count). This is all fixed on release. | ||
83 | */ | ||
84 | |||
85 | /* Status int must be first member of struct */ | ||
86 | struct rtas_update_flash_t | ||
87 | { | ||
88 | int status; /* Flash update status */ | ||
89 | struct flash_block_list *flist; /* Local copy of flash block list */ | ||
90 | }; | ||
91 | |||
92 | /* Status int must be first member of struct */ | ||
93 | struct rtas_manage_flash_t | ||
94 | { | ||
95 | int status; /* Returned status */ | ||
96 | unsigned int op; /* Reject or commit image */ | ||
97 | }; | ||
98 | |||
99 | /* Status int must be first member of struct */ | ||
100 | struct rtas_validate_flash_t | ||
101 | { | ||
102 | int status; /* Returned status */ | ||
103 | char buf[VALIDATE_BUF_SIZE]; /* Candidate image buffer */ | ||
104 | unsigned int buf_size; /* Size of image buf */ | ||
105 | unsigned int update_results; /* Update results token */ | ||
106 | }; | ||
107 | |||
108 | static DEFINE_SPINLOCK(flash_file_open_lock); | ||
109 | static struct proc_dir_entry *firmware_flash_pde; | ||
110 | static struct proc_dir_entry *firmware_update_pde; | ||
111 | static struct proc_dir_entry *validate_pde; | ||
112 | static struct proc_dir_entry *manage_pde; | ||
113 | |||
114 | /* Do simple sanity checks on the flash image. */ | ||
115 | static int flash_list_valid(struct flash_block_list *flist) | ||
116 | { | ||
117 | struct flash_block_list *f; | ||
118 | int i; | ||
119 | unsigned long block_size, image_size; | ||
120 | |||
121 | /* Paranoid self test here. We also collect the image size. */ | ||
122 | image_size = 0; | ||
123 | for (f = flist; f; f = f->next) { | ||
124 | for (i = 0; i < f->num_blocks; i++) { | ||
125 | if (f->blocks[i].data == NULL) { | ||
126 | return FLASH_IMG_NULL_DATA; | ||
127 | } | ||
128 | block_size = f->blocks[i].length; | ||
129 | if (block_size <= 0 || block_size > PAGE_SIZE) { | ||
130 | return FLASH_IMG_BAD_LEN; | ||
131 | } | ||
132 | image_size += block_size; | ||
133 | } | ||
134 | } | ||
135 | |||
136 | if (image_size < (256 << 10)) { | ||
137 | if (image_size < 2) | ||
138 | return FLASH_NO_OP; | ||
139 | } | ||
140 | |||
141 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); | ||
142 | |||
143 | return FLASH_IMG_READY; | ||
144 | } | ||
145 | |||
146 | static void free_flash_list(struct flash_block_list *f) | ||
147 | { | ||
148 | struct flash_block_list *next; | ||
149 | int i; | ||
150 | |||
151 | while (f) { | ||
152 | for (i = 0; i < f->num_blocks; i++) | ||
153 | free_page((unsigned long)(f->blocks[i].data)); | ||
154 | next = f->next; | ||
155 | free_page((unsigned long)f); | ||
156 | f = next; | ||
157 | } | ||
158 | } | ||
159 | |||
160 | static int rtas_flash_release(struct inode *inode, struct file *file) | ||
161 | { | ||
162 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
163 | struct rtas_update_flash_t *uf; | ||
164 | |||
165 | uf = (struct rtas_update_flash_t *) dp->data; | ||
166 | if (uf->flist) { | ||
167 | /* File was opened in write mode for a new flash attempt */ | ||
168 | /* Clear saved list */ | ||
169 | if (rtas_firmware_flash_list.next) { | ||
170 | free_flash_list(rtas_firmware_flash_list.next); | ||
171 | rtas_firmware_flash_list.next = NULL; | ||
172 | } | ||
173 | |||
174 | if (uf->status != FLASH_AUTH) | ||
175 | uf->status = flash_list_valid(uf->flist); | ||
176 | |||
177 | if (uf->status == FLASH_IMG_READY) | ||
178 | rtas_firmware_flash_list.next = uf->flist; | ||
179 | else | ||
180 | free_flash_list(uf->flist); | ||
181 | |||
182 | uf->flist = NULL; | ||
183 | } | ||
184 | |||
185 | atomic_dec(&dp->count); | ||
186 | return 0; | ||
187 | } | ||
188 | |||
189 | static void get_flash_status_msg(int status, char *buf) | ||
190 | { | ||
191 | char *msg; | ||
192 | |||
193 | switch (status) { | ||
194 | case FLASH_AUTH: | ||
195 | msg = "error: this partition does not have service authority\n"; | ||
196 | break; | ||
197 | case FLASH_NO_OP: | ||
198 | msg = "info: no firmware image for flash\n"; | ||
199 | break; | ||
200 | case FLASH_IMG_SHORT: | ||
201 | msg = "error: flash image short\n"; | ||
202 | break; | ||
203 | case FLASH_IMG_BAD_LEN: | ||
204 | msg = "error: internal error bad length\n"; | ||
205 | break; | ||
206 | case FLASH_IMG_NULL_DATA: | ||
207 | msg = "error: internal error null data\n"; | ||
208 | break; | ||
209 | case FLASH_IMG_READY: | ||
210 | msg = "ready: firmware image ready for flash on reboot\n"; | ||
211 | break; | ||
212 | default: | ||
213 | sprintf(buf, "error: unexpected status value %d\n", status); | ||
214 | return; | ||
215 | } | ||
216 | |||
217 | strcpy(buf, msg); | ||
218 | } | ||
219 | |||
220 | /* Reading the proc file will show status (not the firmware contents) */ | ||
221 | static ssize_t rtas_flash_read(struct file *file, char *buf, | ||
222 | size_t count, loff_t *ppos) | ||
223 | { | ||
224 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
225 | struct rtas_update_flash_t *uf; | ||
226 | char msg[RTAS_MSG_MAXLEN]; | ||
227 | int msglen; | ||
228 | |||
229 | uf = (struct rtas_update_flash_t *) dp->data; | ||
230 | |||
231 | if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) { | ||
232 | get_flash_status_msg(uf->status, msg); | ||
233 | } else { /* FIRMWARE_UPDATE_NAME */ | ||
234 | sprintf(msg, "%d\n", uf->status); | ||
235 | } | ||
236 | msglen = strlen(msg); | ||
237 | if (msglen > count) | ||
238 | msglen = count; | ||
239 | |||
240 | if (ppos && *ppos != 0) | ||
241 | return 0; /* be cheap */ | ||
242 | |||
243 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | ||
244 | return -EINVAL; | ||
245 | |||
246 | if (copy_to_user(buf, msg, msglen)) | ||
247 | return -EFAULT; | ||
248 | |||
249 | if (ppos) | ||
250 | *ppos = msglen; | ||
251 | return msglen; | ||
252 | } | ||
253 | |||
254 | /* We could be much more efficient here. But to keep this function | ||
255 | * simple we allocate a page to the block list no matter how small the | ||
256 | * count is. If the system is low on memory it will be just as well | ||
257 | * that we fail.... | ||
258 | */ | ||
259 | static ssize_t rtas_flash_write(struct file *file, const char *buffer, | ||
260 | size_t count, loff_t *off) | ||
261 | { | ||
262 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
263 | struct rtas_update_flash_t *uf; | ||
264 | char *p; | ||
265 | int next_free; | ||
266 | struct flash_block_list *fl; | ||
267 | |||
268 | uf = (struct rtas_update_flash_t *) dp->data; | ||
269 | |||
270 | if (uf->status == FLASH_AUTH || count == 0) | ||
271 | return count; /* discard data */ | ||
272 | |||
273 | /* In the case that the image is not ready for flashing, the memory | ||
274 | * allocated for the block list will be freed upon the release of the | ||
275 | * proc file | ||
276 | */ | ||
277 | if (uf->flist == NULL) { | ||
278 | uf->flist = (struct flash_block_list *) get_zeroed_page(GFP_KERNEL); | ||
279 | if (!uf->flist) | ||
280 | return -ENOMEM; | ||
281 | } | ||
282 | |||
283 | fl = uf->flist; | ||
284 | while (fl->next) | ||
285 | fl = fl->next; /* seek to last block_list for append */ | ||
286 | next_free = fl->num_blocks; | ||
287 | if (next_free == FLASH_BLOCKS_PER_NODE) { | ||
288 | /* Need to allocate another block_list */ | ||
289 | fl->next = (struct flash_block_list *)get_zeroed_page(GFP_KERNEL); | ||
290 | if (!fl->next) | ||
291 | return -ENOMEM; | ||
292 | fl = fl->next; | ||
293 | next_free = 0; | ||
294 | } | ||
295 | |||
296 | if (count > PAGE_SIZE) | ||
297 | count = PAGE_SIZE; | ||
298 | p = (char *)get_zeroed_page(GFP_KERNEL); | ||
299 | if (!p) | ||
300 | return -ENOMEM; | ||
301 | |||
302 | if(copy_from_user(p, buffer, count)) { | ||
303 | free_page((unsigned long)p); | ||
304 | return -EFAULT; | ||
305 | } | ||
306 | fl->blocks[next_free].data = p; | ||
307 | fl->blocks[next_free].length = count; | ||
308 | fl->num_blocks++; | ||
309 | |||
310 | return count; | ||
311 | } | ||
312 | |||
313 | static int rtas_excl_open(struct inode *inode, struct file *file) | ||
314 | { | ||
315 | struct proc_dir_entry *dp = PDE(inode); | ||
316 | |||
317 | /* Enforce exclusive open with use count of PDE */ | ||
318 | spin_lock(&flash_file_open_lock); | ||
319 | if (atomic_read(&dp->count) > 1) { | ||
320 | spin_unlock(&flash_file_open_lock); | ||
321 | return -EBUSY; | ||
322 | } | ||
323 | |||
324 | atomic_inc(&dp->count); | ||
325 | spin_unlock(&flash_file_open_lock); | ||
326 | |||
327 | return 0; | ||
328 | } | ||
329 | |||
330 | static int rtas_excl_release(struct inode *inode, struct file *file) | ||
331 | { | ||
332 | struct proc_dir_entry *dp = PDE(inode); | ||
333 | |||
334 | atomic_dec(&dp->count); | ||
335 | |||
336 | return 0; | ||
337 | } | ||
338 | |||
339 | static void manage_flash(struct rtas_manage_flash_t *args_buf) | ||
340 | { | ||
341 | unsigned int wait_time; | ||
342 | s32 rc; | ||
343 | |||
344 | while (1) { | ||
345 | rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, | ||
346 | 1, NULL, args_buf->op); | ||
347 | if (rc == RTAS_RC_BUSY) | ||
348 | udelay(1); | ||
349 | else if (rtas_is_extended_busy(rc)) { | ||
350 | wait_time = rtas_extended_busy_delay_time(rc); | ||
351 | udelay(wait_time * 1000); | ||
352 | } else | ||
353 | break; | ||
354 | } | ||
355 | |||
356 | args_buf->status = rc; | ||
357 | } | ||
358 | |||
359 | static ssize_t manage_flash_read(struct file *file, char *buf, | ||
360 | size_t count, loff_t *ppos) | ||
361 | { | ||
362 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
363 | struct rtas_manage_flash_t *args_buf; | ||
364 | char msg[RTAS_MSG_MAXLEN]; | ||
365 | int msglen; | ||
366 | |||
367 | args_buf = (struct rtas_manage_flash_t *) dp->data; | ||
368 | if (args_buf == NULL) | ||
369 | return 0; | ||
370 | |||
371 | msglen = sprintf(msg, "%d\n", args_buf->status); | ||
372 | if (msglen > count) | ||
373 | msglen = count; | ||
374 | |||
375 | if (ppos && *ppos != 0) | ||
376 | return 0; /* be cheap */ | ||
377 | |||
378 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | ||
379 | return -EINVAL; | ||
380 | |||
381 | if (copy_to_user(buf, msg, msglen)) | ||
382 | return -EFAULT; | ||
383 | |||
384 | if (ppos) | ||
385 | *ppos = msglen; | ||
386 | return msglen; | ||
387 | } | ||
388 | |||
389 | static ssize_t manage_flash_write(struct file *file, const char *buf, | ||
390 | size_t count, loff_t *off) | ||
391 | { | ||
392 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
393 | struct rtas_manage_flash_t *args_buf; | ||
394 | const char reject_str[] = "0"; | ||
395 | const char commit_str[] = "1"; | ||
396 | char stkbuf[10]; | ||
397 | int op; | ||
398 | |||
399 | args_buf = (struct rtas_manage_flash_t *) dp->data; | ||
400 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) | ||
401 | return count; | ||
402 | |||
403 | op = -1; | ||
404 | if (buf) { | ||
405 | if (count > 9) count = 9; | ||
406 | if (copy_from_user (stkbuf, buf, count)) { | ||
407 | return -EFAULT; | ||
408 | } | ||
409 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) | ||
410 | op = RTAS_REJECT_TMP_IMG; | ||
411 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) | ||
412 | op = RTAS_COMMIT_TMP_IMG; | ||
413 | } | ||
414 | |||
415 | if (op == -1) /* buf is empty, or contains invalid string */ | ||
416 | return -EINVAL; | ||
417 | |||
418 | args_buf->op = op; | ||
419 | manage_flash(args_buf); | ||
420 | |||
421 | return count; | ||
422 | } | ||
423 | |||
424 | static void validate_flash(struct rtas_validate_flash_t *args_buf) | ||
425 | { | ||
426 | int token = rtas_token("ibm,validate-flash-image"); | ||
427 | unsigned int wait_time; | ||
428 | int update_results; | ||
429 | s32 rc; | ||
430 | |||
431 | rc = 0; | ||
432 | while(1) { | ||
433 | spin_lock(&rtas_data_buf_lock); | ||
434 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); | ||
435 | rc = rtas_call(token, 2, 2, &update_results, | ||
436 | (u32) __pa(rtas_data_buf), args_buf->buf_size); | ||
437 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); | ||
438 | spin_unlock(&rtas_data_buf_lock); | ||
439 | |||
440 | if (rc == RTAS_RC_BUSY) | ||
441 | udelay(1); | ||
442 | else if (rtas_is_extended_busy(rc)) { | ||
443 | wait_time = rtas_extended_busy_delay_time(rc); | ||
444 | udelay(wait_time * 1000); | ||
445 | } else | ||
446 | break; | ||
447 | } | ||
448 | |||
449 | args_buf->status = rc; | ||
450 | args_buf->update_results = update_results; | ||
451 | } | ||
452 | |||
453 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, | ||
454 | char *msg) | ||
455 | { | ||
456 | int n; | ||
457 | |||
458 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { | ||
459 | n = sprintf(msg, "%d\n", args_buf->update_results); | ||
460 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || | ||
461 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) | ||
462 | n += sprintf(msg + n, "%s\n", args_buf->buf); | ||
463 | } else { | ||
464 | n = sprintf(msg, "%d\n", args_buf->status); | ||
465 | } | ||
466 | return n; | ||
467 | } | ||
468 | |||
469 | static ssize_t validate_flash_read(struct file *file, char *buf, | ||
470 | size_t count, loff_t *ppos) | ||
471 | { | ||
472 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
473 | struct rtas_validate_flash_t *args_buf; | ||
474 | char msg[RTAS_MSG_MAXLEN]; | ||
475 | int msglen; | ||
476 | |||
477 | args_buf = (struct rtas_validate_flash_t *) dp->data; | ||
478 | |||
479 | if (ppos && *ppos != 0) | ||
480 | return 0; /* be cheap */ | ||
481 | |||
482 | msglen = get_validate_flash_msg(args_buf, msg); | ||
483 | if (msglen > count) | ||
484 | msglen = count; | ||
485 | |||
486 | if (!access_ok(VERIFY_WRITE, buf, msglen)) | ||
487 | return -EINVAL; | ||
488 | |||
489 | if (copy_to_user(buf, msg, msglen)) | ||
490 | return -EFAULT; | ||
491 | |||
492 | if (ppos) | ||
493 | *ppos = msglen; | ||
494 | return msglen; | ||
495 | } | ||
496 | |||
497 | static ssize_t validate_flash_write(struct file *file, const char *buf, | ||
498 | size_t count, loff_t *off) | ||
499 | { | ||
500 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
501 | struct rtas_validate_flash_t *args_buf; | ||
502 | int rc; | ||
503 | |||
504 | args_buf = (struct rtas_validate_flash_t *) dp->data; | ||
505 | |||
506 | if (dp->data == NULL) { | ||
507 | dp->data = kmalloc(sizeof(struct rtas_validate_flash_t), | ||
508 | GFP_KERNEL); | ||
509 | if (dp->data == NULL) | ||
510 | return -ENOMEM; | ||
511 | } | ||
512 | |||
513 | /* We are only interested in the first 4K of the | ||
514 | * candidate image */ | ||
515 | if ((*off >= VALIDATE_BUF_SIZE) || | ||
516 | (args_buf->status == VALIDATE_AUTH)) { | ||
517 | *off += count; | ||
518 | return count; | ||
519 | } | ||
520 | |||
521 | if (*off + count >= VALIDATE_BUF_SIZE) { | ||
522 | count = VALIDATE_BUF_SIZE - *off; | ||
523 | args_buf->status = VALIDATE_READY; | ||
524 | } else { | ||
525 | args_buf->status = VALIDATE_INCOMPLETE; | ||
526 | } | ||
527 | |||
528 | if (!access_ok(VERIFY_READ, buf, count)) { | ||
529 | rc = -EFAULT; | ||
530 | goto done; | ||
531 | } | ||
532 | if (copy_from_user(args_buf->buf + *off, buf, count)) { | ||
533 | rc = -EFAULT; | ||
534 | goto done; | ||
535 | } | ||
536 | |||
537 | *off += count; | ||
538 | rc = count; | ||
539 | done: | ||
540 | if (rc < 0) { | ||
541 | kfree(dp->data); | ||
542 | dp->data = NULL; | ||
543 | } | ||
544 | return rc; | ||
545 | } | ||
546 | |||
547 | static int validate_flash_release(struct inode *inode, struct file *file) | ||
548 | { | ||
549 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | ||
550 | struct rtas_validate_flash_t *args_buf; | ||
551 | |||
552 | args_buf = (struct rtas_validate_flash_t *) dp->data; | ||
553 | |||
554 | if (args_buf->status == VALIDATE_READY) { | ||
555 | args_buf->buf_size = VALIDATE_BUF_SIZE; | ||
556 | validate_flash(args_buf); | ||
557 | } | ||
558 | |||
559 | /* The matching atomic_inc was in rtas_excl_open() */ | ||
560 | atomic_dec(&dp->count); | ||
561 | |||
562 | return 0; | ||
563 | } | ||
564 | |||
565 | static void remove_flash_pde(struct proc_dir_entry *dp) | ||
566 | { | ||
567 | if (dp) { | ||
568 | if (dp->data != NULL) | ||
569 | kfree(dp->data); | ||
570 | dp->owner = NULL; | ||
571 | remove_proc_entry(dp->name, dp->parent); | ||
572 | } | ||
573 | } | ||
574 | |||
575 | static int initialize_flash_pde_data(const char *rtas_call_name, | ||
576 | size_t buf_size, | ||
577 | struct proc_dir_entry *dp) | ||
578 | { | ||
579 | int *status; | ||
580 | int token; | ||
581 | |||
582 | dp->data = kmalloc(buf_size, GFP_KERNEL); | ||
583 | if (dp->data == NULL) { | ||
584 | remove_flash_pde(dp); | ||
585 | return -ENOMEM; | ||
586 | } | ||
587 | |||
588 | memset(dp->data, 0, buf_size); | ||
589 | |||
590 | /* | ||
591 | * This code assumes that the status int is the first member of the | ||
592 | * struct | ||
593 | */ | ||
594 | status = (int *) dp->data; | ||
595 | token = rtas_token(rtas_call_name); | ||
596 | if (token == RTAS_UNKNOWN_SERVICE) | ||
597 | *status = FLASH_AUTH; | ||
598 | else | ||
599 | *status = FLASH_NO_OP; | ||
600 | |||
601 | return 0; | ||
602 | } | ||
603 | |||
604 | static struct proc_dir_entry *create_flash_pde(const char *filename, | ||
605 | struct file_operations *fops) | ||
606 | { | ||
607 | struct proc_dir_entry *ent = NULL; | ||
608 | |||
609 | ent = create_proc_entry(filename, S_IRUSR | S_IWUSR, NULL); | ||
610 | if (ent != NULL) { | ||
611 | ent->nlink = 1; | ||
612 | ent->proc_fops = fops; | ||
613 | ent->owner = THIS_MODULE; | ||
614 | } | ||
615 | |||
616 | return ent; | ||
617 | } | ||
618 | |||
619 | static struct file_operations rtas_flash_operations = { | ||
620 | .read = rtas_flash_read, | ||
621 | .write = rtas_flash_write, | ||
622 | .open = rtas_excl_open, | ||
623 | .release = rtas_flash_release, | ||
624 | }; | ||
625 | |||
626 | static struct file_operations manage_flash_operations = { | ||
627 | .read = manage_flash_read, | ||
628 | .write = manage_flash_write, | ||
629 | .open = rtas_excl_open, | ||
630 | .release = rtas_excl_release, | ||
631 | }; | ||
632 | |||
633 | static struct file_operations validate_flash_operations = { | ||
634 | .read = validate_flash_read, | ||
635 | .write = validate_flash_write, | ||
636 | .open = rtas_excl_open, | ||
637 | .release = validate_flash_release, | ||
638 | }; | ||
639 | |||
640 | int __init rtas_flash_init(void) | ||
641 | { | ||
642 | int rc; | ||
643 | |||
644 | if (rtas_token("ibm,update-flash-64-and-reboot") == | ||
645 | RTAS_UNKNOWN_SERVICE) { | ||
646 | printk(KERN_ERR "rtas_flash: no firmware flash support\n"); | ||
647 | return 1; | ||
648 | } | ||
649 | |||
650 | firmware_flash_pde = create_flash_pde("ppc64/rtas/" | ||
651 | FIRMWARE_FLASH_NAME, | ||
652 | &rtas_flash_operations); | ||
653 | if (firmware_flash_pde == NULL) { | ||
654 | rc = -ENOMEM; | ||
655 | goto cleanup; | ||
656 | } | ||
657 | |||
658 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | ||
659 | sizeof(struct rtas_update_flash_t), | ||
660 | firmware_flash_pde); | ||
661 | if (rc != 0) | ||
662 | goto cleanup; | ||
663 | |||
664 | firmware_update_pde = create_flash_pde("ppc64/rtas/" | ||
665 | FIRMWARE_UPDATE_NAME, | ||
666 | &rtas_flash_operations); | ||
667 | if (firmware_update_pde == NULL) { | ||
668 | rc = -ENOMEM; | ||
669 | goto cleanup; | ||
670 | } | ||
671 | |||
672 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | ||
673 | sizeof(struct rtas_update_flash_t), | ||
674 | firmware_update_pde); | ||
675 | if (rc != 0) | ||
676 | goto cleanup; | ||
677 | |||
678 | validate_pde = create_flash_pde("ppc64/rtas/" VALIDATE_FLASH_NAME, | ||
679 | &validate_flash_operations); | ||
680 | if (validate_pde == NULL) { | ||
681 | rc = -ENOMEM; | ||
682 | goto cleanup; | ||
683 | } | ||
684 | |||
685 | rc = initialize_flash_pde_data("ibm,validate-flash-image", | ||
686 | sizeof(struct rtas_validate_flash_t), | ||
687 | validate_pde); | ||
688 | if (rc != 0) | ||
689 | goto cleanup; | ||
690 | |||
691 | manage_pde = create_flash_pde("ppc64/rtas/" MANAGE_FLASH_NAME, | ||
692 | &manage_flash_operations); | ||
693 | if (manage_pde == NULL) { | ||
694 | rc = -ENOMEM; | ||
695 | goto cleanup; | ||
696 | } | ||
697 | |||
698 | rc = initialize_flash_pde_data("ibm,manage-flash-image", | ||
699 | sizeof(struct rtas_manage_flash_t), | ||
700 | manage_pde); | ||
701 | if (rc != 0) | ||
702 | goto cleanup; | ||
703 | |||
704 | return 0; | ||
705 | |||
706 | cleanup: | ||
707 | remove_flash_pde(firmware_flash_pde); | ||
708 | remove_flash_pde(firmware_update_pde); | ||
709 | remove_flash_pde(validate_pde); | ||
710 | remove_flash_pde(manage_pde); | ||
711 | |||
712 | return rc; | ||
713 | } | ||
714 | |||
715 | void __exit rtas_flash_cleanup(void) | ||
716 | { | ||
717 | remove_flash_pde(firmware_flash_pde); | ||
718 | remove_flash_pde(firmware_update_pde); | ||
719 | remove_flash_pde(validate_pde); | ||
720 | remove_flash_pde(manage_pde); | ||
721 | } | ||
722 | |||
723 | module_init(rtas_flash_init); | ||
724 | module_exit(rtas_flash_cleanup); | ||
725 | MODULE_LICENSE("GPL"); | ||