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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 | * | |
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 | 19 | #include <linux/proc_fs.h> |
c5f41752 | 20 | #include <linux/reboot.h> |
1da177e4 LT |
21 | #include <asm/delay.h> |
22 | #include <asm/uaccess.h> | |
23 | #include <asm/rtas.h> | |
f4fcbbe9 | 24 | #include <asm/abs_addr.h> |
1da177e4 LT |
25 | |
26 | #define MODULE_VERS "1.0" | |
27 | #define MODULE_NAME "rtas_flash" | |
28 | ||
29 | #define FIRMWARE_FLASH_NAME "firmware_flash" | |
30 | #define FIRMWARE_UPDATE_NAME "firmware_update" | |
31 | #define MANAGE_FLASH_NAME "manage_flash" | |
32 | #define VALIDATE_FLASH_NAME "validate_flash" | |
33 | ||
34 | /* General RTAS Status Codes */ | |
35 | #define RTAS_RC_SUCCESS 0 | |
36 | #define RTAS_RC_HW_ERR -1 | |
37 | #define RTAS_RC_BUSY -2 | |
38 | ||
39 | /* Flash image status values */ | |
40 | #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
41 | #define FLASH_NO_OP -1099 /* No operation initiated by user */ | |
42 | #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ | |
43 | #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ | |
44 | #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ | |
45 | #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ | |
46 | ||
47 | /* Manage image status values */ | |
48 | #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
49 | #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ | |
50 | #define MANAGE_NO_OP -1099 /* No operation initiated by user */ | |
51 | #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
52 | #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ | |
53 | ||
54 | /* Validate image status values */ | |
55 | #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
56 | #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ | |
57 | #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ | |
58 | #define VALIDATE_READY -1001 /* Firmware image ready for validation */ | |
59 | #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
60 | #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ | |
61 | #define VALIDATE_TMP_UPDATE 0 /* Validate Return Status */ | |
62 | #define VALIDATE_FLASH_AUTH 1 /* Validate Return Status */ | |
63 | #define VALIDATE_INVALID_IMG 2 /* Validate Return Status */ | |
64 | #define VALIDATE_CUR_UNKNOWN 3 /* Validate Return Status */ | |
65 | #define VALIDATE_TMP_COMMIT_DL 4 /* Validate Return Status */ | |
66 | #define VALIDATE_TMP_COMMIT 5 /* Validate Return Status */ | |
67 | #define VALIDATE_TMP_UPDATE_DL 6 /* Validate Return Status */ | |
68 | ||
69 | /* ibm,manage-flash-image operation tokens */ | |
70 | #define RTAS_REJECT_TMP_IMG 0 | |
71 | #define RTAS_COMMIT_TMP_IMG 1 | |
72 | ||
73 | /* Array sizes */ | |
74 | #define VALIDATE_BUF_SIZE 4096 | |
75 | #define RTAS_MSG_MAXLEN 64 | |
76 | ||
ae883cab JR |
77 | /* Quirk - RTAS requires 4k list length and block size */ |
78 | #define RTAS_BLKLIST_LENGTH 4096 | |
79 | #define RTAS_BLK_SIZE 4096 | |
80 | ||
f4fcbbe9 PM |
81 | struct flash_block { |
82 | char *data; | |
83 | unsigned long length; | |
84 | }; | |
85 | ||
86 | /* This struct is very similar but not identical to | |
87 | * that needed by the rtas flash update. | |
88 | * All we need to do for rtas is rewrite num_blocks | |
89 | * into a version/length and translate the pointers | |
90 | * to absolute. | |
91 | */ | |
ae883cab | 92 | #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) |
f4fcbbe9 PM |
93 | struct flash_block_list { |
94 | unsigned long num_blocks; | |
95 | struct flash_block_list *next; | |
96 | struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; | |
97 | }; | |
f4fcbbe9 | 98 | |
bd2b64a1 | 99 | static struct flash_block_list *rtas_firmware_flash_list; |
f4fcbbe9 | 100 | |
ae883cab | 101 | /* Use slab cache to guarantee 4k alignment */ |
e18b890b | 102 | static struct kmem_cache *flash_block_cache = NULL; |
ae883cab | 103 | |
f4fcbbe9 PM |
104 | #define FLASH_BLOCK_LIST_VERSION (1UL) |
105 | ||
1da177e4 LT |
106 | /* Local copy of the flash block list. |
107 | * We only allow one open of the flash proc file and create this | |
bd2b64a1 MM |
108 | * list as we go. The rtas_firmware_flash_list varable will be |
109 | * set once the data is fully read. | |
1da177e4 LT |
110 | * |
111 | * For convenience as we build the list we use virtual addrs, | |
112 | * we do not fill in the version number, and the length field | |
113 | * is treated as the number of entries currently in the block | |
bd2b64a1 MM |
114 | * (i.e. not a byte count). This is all fixed when calling |
115 | * the flash routine. | |
1da177e4 LT |
116 | */ |
117 | ||
118 | /* Status int must be first member of struct */ | |
119 | struct rtas_update_flash_t | |
120 | { | |
121 | int status; /* Flash update status */ | |
122 | struct flash_block_list *flist; /* Local copy of flash block list */ | |
123 | }; | |
124 | ||
125 | /* Status int must be first member of struct */ | |
126 | struct rtas_manage_flash_t | |
127 | { | |
128 | int status; /* Returned status */ | |
129 | unsigned int op; /* Reject or commit image */ | |
130 | }; | |
131 | ||
132 | /* Status int must be first member of struct */ | |
133 | struct rtas_validate_flash_t | |
134 | { | |
135 | int status; /* Returned status */ | |
136 | char buf[VALIDATE_BUF_SIZE]; /* Candidate image buffer */ | |
137 | unsigned int buf_size; /* Size of image buf */ | |
138 | unsigned int update_results; /* Update results token */ | |
139 | }; | |
140 | ||
141 | static DEFINE_SPINLOCK(flash_file_open_lock); | |
142 | static struct proc_dir_entry *firmware_flash_pde; | |
143 | static struct proc_dir_entry *firmware_update_pde; | |
144 | static struct proc_dir_entry *validate_pde; | |
145 | static struct proc_dir_entry *manage_pde; | |
146 | ||
147 | /* Do simple sanity checks on the flash image. */ | |
148 | static int flash_list_valid(struct flash_block_list *flist) | |
149 | { | |
150 | struct flash_block_list *f; | |
151 | int i; | |
152 | unsigned long block_size, image_size; | |
153 | ||
154 | /* Paranoid self test here. We also collect the image size. */ | |
155 | image_size = 0; | |
156 | for (f = flist; f; f = f->next) { | |
157 | for (i = 0; i < f->num_blocks; i++) { | |
158 | if (f->blocks[i].data == NULL) { | |
159 | return FLASH_IMG_NULL_DATA; | |
160 | } | |
161 | block_size = f->blocks[i].length; | |
ae883cab | 162 | if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { |
1da177e4 LT |
163 | return FLASH_IMG_BAD_LEN; |
164 | } | |
165 | image_size += block_size; | |
166 | } | |
167 | } | |
168 | ||
169 | if (image_size < (256 << 10)) { | |
170 | if (image_size < 2) | |
171 | return FLASH_NO_OP; | |
172 | } | |
173 | ||
174 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); | |
175 | ||
176 | return FLASH_IMG_READY; | |
177 | } | |
178 | ||
179 | static void free_flash_list(struct flash_block_list *f) | |
180 | { | |
181 | struct flash_block_list *next; | |
182 | int i; | |
183 | ||
184 | while (f) { | |
185 | for (i = 0; i < f->num_blocks; i++) | |
ae883cab | 186 | kmem_cache_free(flash_block_cache, f->blocks[i].data); |
1da177e4 | 187 | next = f->next; |
ae883cab | 188 | kmem_cache_free(flash_block_cache, f); |
1da177e4 LT |
189 | f = next; |
190 | } | |
191 | } | |
192 | ||
193 | static int rtas_flash_release(struct inode *inode, struct file *file) | |
194 | { | |
b4d1ab58 | 195 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
196 | struct rtas_update_flash_t *uf; |
197 | ||
198 | uf = (struct rtas_update_flash_t *) dp->data; | |
199 | if (uf->flist) { | |
200 | /* File was opened in write mode for a new flash attempt */ | |
201 | /* Clear saved list */ | |
bd2b64a1 MM |
202 | if (rtas_firmware_flash_list) { |
203 | free_flash_list(rtas_firmware_flash_list); | |
204 | rtas_firmware_flash_list = NULL; | |
1da177e4 LT |
205 | } |
206 | ||
207 | if (uf->status != FLASH_AUTH) | |
208 | uf->status = flash_list_valid(uf->flist); | |
209 | ||
210 | if (uf->status == FLASH_IMG_READY) | |
bd2b64a1 | 211 | rtas_firmware_flash_list = uf->flist; |
1da177e4 LT |
212 | else |
213 | free_flash_list(uf->flist); | |
214 | ||
215 | uf->flist = NULL; | |
216 | } | |
217 | ||
218 | atomic_dec(&dp->count); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static void get_flash_status_msg(int status, char *buf) | |
223 | { | |
224 | char *msg; | |
225 | ||
226 | switch (status) { | |
227 | case FLASH_AUTH: | |
228 | msg = "error: this partition does not have service authority\n"; | |
229 | break; | |
230 | case FLASH_NO_OP: | |
231 | msg = "info: no firmware image for flash\n"; | |
232 | break; | |
233 | case FLASH_IMG_SHORT: | |
234 | msg = "error: flash image short\n"; | |
235 | break; | |
236 | case FLASH_IMG_BAD_LEN: | |
237 | msg = "error: internal error bad length\n"; | |
238 | break; | |
239 | case FLASH_IMG_NULL_DATA: | |
240 | msg = "error: internal error null data\n"; | |
241 | break; | |
242 | case FLASH_IMG_READY: | |
243 | msg = "ready: firmware image ready for flash on reboot\n"; | |
244 | break; | |
245 | default: | |
246 | sprintf(buf, "error: unexpected status value %d\n", status); | |
247 | return; | |
248 | } | |
249 | ||
250 | strcpy(buf, msg); | |
251 | } | |
252 | ||
253 | /* Reading the proc file will show status (not the firmware contents) */ | |
efa54579 | 254 | static ssize_t rtas_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
255 | size_t count, loff_t *ppos) |
256 | { | |
b4d1ab58 | 257 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
258 | struct rtas_update_flash_t *uf; |
259 | char msg[RTAS_MSG_MAXLEN]; | |
1da177e4 | 260 | |
4c4a5cf6 | 261 | uf = dp->data; |
1da177e4 LT |
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 | } | |
1da177e4 | 268 | |
4c4a5cf6 | 269 | return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg)); |
1da177e4 LT |
270 | } |
271 | ||
ae883cab | 272 | /* constructor for flash_block_cache */ |
51cc5068 | 273 | void rtas_block_ctor(void *ptr) |
ae883cab JR |
274 | { |
275 | memset(ptr, 0, RTAS_BLK_SIZE); | |
276 | } | |
277 | ||
1da177e4 LT |
278 | /* We could be much more efficient here. But to keep this function |
279 | * simple we allocate a page to the block list no matter how small the | |
280 | * count is. If the system is low on memory it will be just as well | |
281 | * that we fail.... | |
282 | */ | |
efa54579 | 283 | static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
284 | size_t count, loff_t *off) |
285 | { | |
b4d1ab58 | 286 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
287 | struct rtas_update_flash_t *uf; |
288 | char *p; | |
289 | int next_free; | |
290 | struct flash_block_list *fl; | |
291 | ||
292 | uf = (struct rtas_update_flash_t *) dp->data; | |
293 | ||
294 | if (uf->status == FLASH_AUTH || count == 0) | |
295 | return count; /* discard data */ | |
296 | ||
297 | /* In the case that the image is not ready for flashing, the memory | |
298 | * allocated for the block list will be freed upon the release of the | |
299 | * proc file | |
300 | */ | |
301 | if (uf->flist == NULL) { | |
ae883cab | 302 | uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); |
1da177e4 LT |
303 | if (!uf->flist) |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | fl = uf->flist; | |
308 | while (fl->next) | |
309 | fl = fl->next; /* seek to last block_list for append */ | |
310 | next_free = fl->num_blocks; | |
311 | if (next_free == FLASH_BLOCKS_PER_NODE) { | |
312 | /* Need to allocate another block_list */ | |
ae883cab | 313 | fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); |
1da177e4 LT |
314 | if (!fl->next) |
315 | return -ENOMEM; | |
316 | fl = fl->next; | |
317 | next_free = 0; | |
318 | } | |
319 | ||
ae883cab JR |
320 | if (count > RTAS_BLK_SIZE) |
321 | count = RTAS_BLK_SIZE; | |
322 | p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL); | |
1da177e4 LT |
323 | if (!p) |
324 | return -ENOMEM; | |
325 | ||
326 | if(copy_from_user(p, buffer, count)) { | |
ae883cab | 327 | kmem_cache_free(flash_block_cache, p); |
1da177e4 LT |
328 | return -EFAULT; |
329 | } | |
330 | fl->blocks[next_free].data = p; | |
331 | fl->blocks[next_free].length = count; | |
332 | fl->num_blocks++; | |
333 | ||
334 | return count; | |
335 | } | |
336 | ||
337 | static int rtas_excl_open(struct inode *inode, struct file *file) | |
338 | { | |
339 | struct proc_dir_entry *dp = PDE(inode); | |
340 | ||
341 | /* Enforce exclusive open with use count of PDE */ | |
342 | spin_lock(&flash_file_open_lock); | |
74848398 | 343 | if (atomic_read(&dp->count) > 2) { |
1da177e4 LT |
344 | spin_unlock(&flash_file_open_lock); |
345 | return -EBUSY; | |
346 | } | |
347 | ||
348 | atomic_inc(&dp->count); | |
349 | spin_unlock(&flash_file_open_lock); | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | static int rtas_excl_release(struct inode *inode, struct file *file) | |
355 | { | |
356 | struct proc_dir_entry *dp = PDE(inode); | |
357 | ||
358 | atomic_dec(&dp->count); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static void manage_flash(struct rtas_manage_flash_t *args_buf) | |
364 | { | |
1da177e4 LT |
365 | s32 rc; |
366 | ||
507279db | 367 | do { |
1da177e4 LT |
368 | rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, |
369 | 1, NULL, args_buf->op); | |
507279db | 370 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
371 | |
372 | args_buf->status = rc; | |
373 | } | |
374 | ||
efa54579 | 375 | static ssize_t manage_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
376 | size_t count, loff_t *ppos) |
377 | { | |
b4d1ab58 | 378 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
379 | struct rtas_manage_flash_t *args_buf; |
380 | char msg[RTAS_MSG_MAXLEN]; | |
381 | int msglen; | |
382 | ||
4c4a5cf6 | 383 | args_buf = dp->data; |
1da177e4 LT |
384 | if (args_buf == NULL) |
385 | return 0; | |
386 | ||
387 | msglen = sprintf(msg, "%d\n", args_buf->status); | |
1da177e4 | 388 | |
4c4a5cf6 | 389 | return simple_read_from_buffer(buf, count, ppos, msg, msglen); |
1da177e4 LT |
390 | } |
391 | ||
efa54579 | 392 | static ssize_t manage_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
393 | size_t count, loff_t *off) |
394 | { | |
b4d1ab58 | 395 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
396 | struct rtas_manage_flash_t *args_buf; |
397 | const char reject_str[] = "0"; | |
398 | const char commit_str[] = "1"; | |
399 | char stkbuf[10]; | |
400 | int op; | |
401 | ||
402 | args_buf = (struct rtas_manage_flash_t *) dp->data; | |
403 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) | |
404 | return count; | |
405 | ||
406 | op = -1; | |
407 | if (buf) { | |
408 | if (count > 9) count = 9; | |
409 | if (copy_from_user (stkbuf, buf, count)) { | |
410 | return -EFAULT; | |
411 | } | |
412 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) | |
413 | op = RTAS_REJECT_TMP_IMG; | |
414 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) | |
415 | op = RTAS_COMMIT_TMP_IMG; | |
416 | } | |
417 | ||
418 | if (op == -1) /* buf is empty, or contains invalid string */ | |
419 | return -EINVAL; | |
420 | ||
421 | args_buf->op = op; | |
422 | manage_flash(args_buf); | |
423 | ||
424 | return count; | |
425 | } | |
426 | ||
427 | static void validate_flash(struct rtas_validate_flash_t *args_buf) | |
428 | { | |
429 | int token = rtas_token("ibm,validate-flash-image"); | |
1da177e4 LT |
430 | int update_results; |
431 | s32 rc; | |
432 | ||
433 | rc = 0; | |
507279db | 434 | do { |
1da177e4 LT |
435 | spin_lock(&rtas_data_buf_lock); |
436 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); | |
437 | rc = rtas_call(token, 2, 2, &update_results, | |
438 | (u32) __pa(rtas_data_buf), args_buf->buf_size); | |
439 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); | |
440 | spin_unlock(&rtas_data_buf_lock); | |
507279db | 441 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
442 | |
443 | args_buf->status = rc; | |
444 | args_buf->update_results = update_results; | |
445 | } | |
446 | ||
447 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, | |
448 | char *msg) | |
449 | { | |
450 | int n; | |
451 | ||
452 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { | |
453 | n = sprintf(msg, "%d\n", args_buf->update_results); | |
454 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || | |
455 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) | |
456 | n += sprintf(msg + n, "%s\n", args_buf->buf); | |
457 | } else { | |
458 | n = sprintf(msg, "%d\n", args_buf->status); | |
459 | } | |
460 | return n; | |
461 | } | |
462 | ||
efa54579 | 463 | static ssize_t validate_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
464 | size_t count, loff_t *ppos) |
465 | { | |
b4d1ab58 | 466 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
467 | struct rtas_validate_flash_t *args_buf; |
468 | char msg[RTAS_MSG_MAXLEN]; | |
469 | int msglen; | |
470 | ||
4c4a5cf6 | 471 | args_buf = dp->data; |
1da177e4 | 472 | |
1da177e4 | 473 | msglen = get_validate_flash_msg(args_buf, msg); |
1da177e4 | 474 | |
4c4a5cf6 | 475 | return simple_read_from_buffer(buf, count, ppos, msg, msglen); |
1da177e4 LT |
476 | } |
477 | ||
efa54579 | 478 | static ssize_t validate_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
479 | size_t count, loff_t *off) |
480 | { | |
b4d1ab58 | 481 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
482 | struct rtas_validate_flash_t *args_buf; |
483 | int rc; | |
484 | ||
485 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
486 | ||
487 | if (dp->data == NULL) { | |
488 | dp->data = kmalloc(sizeof(struct rtas_validate_flash_t), | |
489 | GFP_KERNEL); | |
490 | if (dp->data == NULL) | |
491 | return -ENOMEM; | |
492 | } | |
493 | ||
494 | /* We are only interested in the first 4K of the | |
495 | * candidate image */ | |
496 | if ((*off >= VALIDATE_BUF_SIZE) || | |
497 | (args_buf->status == VALIDATE_AUTH)) { | |
498 | *off += count; | |
499 | return count; | |
500 | } | |
501 | ||
502 | if (*off + count >= VALIDATE_BUF_SIZE) { | |
503 | count = VALIDATE_BUF_SIZE - *off; | |
504 | args_buf->status = VALIDATE_READY; | |
505 | } else { | |
506 | args_buf->status = VALIDATE_INCOMPLETE; | |
507 | } | |
508 | ||
509 | if (!access_ok(VERIFY_READ, buf, count)) { | |
510 | rc = -EFAULT; | |
511 | goto done; | |
512 | } | |
513 | if (copy_from_user(args_buf->buf + *off, buf, count)) { | |
514 | rc = -EFAULT; | |
515 | goto done; | |
516 | } | |
517 | ||
518 | *off += count; | |
519 | rc = count; | |
520 | done: | |
521 | if (rc < 0) { | |
522 | kfree(dp->data); | |
523 | dp->data = NULL; | |
524 | } | |
525 | return rc; | |
526 | } | |
527 | ||
528 | static int validate_flash_release(struct inode *inode, struct file *file) | |
529 | { | |
b4d1ab58 | 530 | struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode); |
1da177e4 LT |
531 | struct rtas_validate_flash_t *args_buf; |
532 | ||
533 | args_buf = (struct rtas_validate_flash_t *) dp->data; | |
534 | ||
535 | if (args_buf->status == VALIDATE_READY) { | |
536 | args_buf->buf_size = VALIDATE_BUF_SIZE; | |
537 | validate_flash(args_buf); | |
538 | } | |
539 | ||
540 | /* The matching atomic_inc was in rtas_excl_open() */ | |
541 | atomic_dec(&dp->count); | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
f4fcbbe9 PM |
546 | static void rtas_flash_firmware(int reboot_type) |
547 | { | |
548 | unsigned long image_size; | |
549 | struct flash_block_list *f, *next, *flist; | |
550 | unsigned long rtas_block_list; | |
551 | int i, status, update_token; | |
552 | ||
bd2b64a1 | 553 | if (rtas_firmware_flash_list == NULL) |
f4fcbbe9 PM |
554 | return; /* nothing to do */ |
555 | ||
556 | if (reboot_type != SYS_RESTART) { | |
557 | printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); | |
558 | printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); | |
559 | return; | |
560 | } | |
561 | ||
562 | update_token = rtas_token("ibm,update-flash-64-and-reboot"); | |
563 | if (update_token == RTAS_UNKNOWN_SERVICE) { | |
564 | printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " | |
565 | "is not available -- not a service partition?\n"); | |
566 | printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); | |
567 | return; | |
568 | } | |
569 | ||
df17f56d RN |
570 | /* |
571 | * Just before starting the firmware flash, cancel the event scan work | |
572 | * to avoid any soft lockup issues. | |
573 | */ | |
574 | rtas_cancel_event_scan(); | |
575 | ||
bd2b64a1 MM |
576 | /* |
577 | * NOTE: the "first" block must be under 4GB, so we create | |
578 | * an entry with no data blocks in the reserved buffer in | |
579 | * the kernel data segment. | |
f4fcbbe9 | 580 | */ |
bd2b64a1 MM |
581 | spin_lock(&rtas_data_buf_lock); |
582 | flist = (struct flash_block_list *)&rtas_data_buf[0]; | |
583 | flist->num_blocks = 0; | |
584 | flist->next = rtas_firmware_flash_list; | |
f4fcbbe9 PM |
585 | rtas_block_list = virt_to_abs(flist); |
586 | if (rtas_block_list >= 4UL*1024*1024*1024) { | |
587 | printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); | |
bd2b64a1 | 588 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
589 | return; |
590 | } | |
591 | ||
592 | printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); | |
593 | /* Update the block_list in place. */ | |
bd2b64a1 | 594 | rtas_firmware_flash_list = NULL; /* too hard to backout on error */ |
f4fcbbe9 PM |
595 | image_size = 0; |
596 | for (f = flist; f; f = next) { | |
597 | /* Translate data addrs to absolute */ | |
598 | for (i = 0; i < f->num_blocks; i++) { | |
599 | f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data); | |
600 | image_size += f->blocks[i].length; | |
601 | } | |
602 | next = f->next; | |
603 | /* Don't translate NULL pointer for last entry */ | |
604 | if (f->next) | |
605 | f->next = (struct flash_block_list *)virt_to_abs(f->next); | |
606 | else | |
607 | f->next = NULL; | |
608 | /* make num_blocks into the version/length field */ | |
609 | f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); | |
610 | } | |
611 | ||
612 | printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); | |
613 | printk(KERN_ALERT "FLASH: performing flash and reboot\n"); | |
614 | rtas_progress("Flashing \n", 0x0); | |
615 | rtas_progress("Please Wait... ", 0x0); | |
616 | printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); | |
617 | status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); | |
618 | switch (status) { /* should only get "bad" status */ | |
619 | case 0: | |
620 | printk(KERN_ALERT "FLASH: success\n"); | |
621 | break; | |
622 | case -1: | |
623 | printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); | |
624 | break; | |
625 | case -3: | |
626 | printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); | |
627 | break; | |
628 | case -4: | |
629 | printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); | |
630 | break; | |
631 | default: | |
632 | printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); | |
633 | break; | |
634 | } | |
bd2b64a1 | 635 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
636 | } |
637 | ||
1da177e4 LT |
638 | static void remove_flash_pde(struct proc_dir_entry *dp) |
639 | { | |
640 | if (dp) { | |
95eff20f | 641 | kfree(dp->data); |
1da177e4 LT |
642 | remove_proc_entry(dp->name, dp->parent); |
643 | } | |
644 | } | |
645 | ||
646 | static int initialize_flash_pde_data(const char *rtas_call_name, | |
647 | size_t buf_size, | |
648 | struct proc_dir_entry *dp) | |
649 | { | |
650 | int *status; | |
651 | int token; | |
652 | ||
f8485350 | 653 | dp->data = kzalloc(buf_size, GFP_KERNEL); |
1da177e4 LT |
654 | if (dp->data == NULL) { |
655 | remove_flash_pde(dp); | |
656 | return -ENOMEM; | |
657 | } | |
658 | ||
1da177e4 LT |
659 | /* |
660 | * This code assumes that the status int is the first member of the | |
661 | * struct | |
662 | */ | |
663 | status = (int *) dp->data; | |
664 | token = rtas_token(rtas_call_name); | |
665 | if (token == RTAS_UNKNOWN_SERVICE) | |
666 | *status = FLASH_AUTH; | |
667 | else | |
668 | *status = FLASH_NO_OP; | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static struct proc_dir_entry *create_flash_pde(const char *filename, | |
5dfe4c96 | 674 | const struct file_operations *fops) |
1da177e4 | 675 | { |
66747138 | 676 | return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops); |
1da177e4 LT |
677 | } |
678 | ||
5dfe4c96 | 679 | static const struct file_operations rtas_flash_operations = { |
66747138 | 680 | .owner = THIS_MODULE, |
1da177e4 LT |
681 | .read = rtas_flash_read, |
682 | .write = rtas_flash_write, | |
683 | .open = rtas_excl_open, | |
684 | .release = rtas_flash_release, | |
6038f373 | 685 | .llseek = default_llseek, |
1da177e4 LT |
686 | }; |
687 | ||
5dfe4c96 | 688 | static const struct file_operations manage_flash_operations = { |
66747138 | 689 | .owner = THIS_MODULE, |
1da177e4 LT |
690 | .read = manage_flash_read, |
691 | .write = manage_flash_write, | |
692 | .open = rtas_excl_open, | |
693 | .release = rtas_excl_release, | |
6038f373 | 694 | .llseek = default_llseek, |
1da177e4 LT |
695 | }; |
696 | ||
5dfe4c96 | 697 | static const struct file_operations validate_flash_operations = { |
66747138 | 698 | .owner = THIS_MODULE, |
1da177e4 LT |
699 | .read = validate_flash_read, |
700 | .write = validate_flash_write, | |
701 | .open = rtas_excl_open, | |
702 | .release = validate_flash_release, | |
6038f373 | 703 | .llseek = default_llseek, |
1da177e4 LT |
704 | }; |
705 | ||
1c21a293 | 706 | static int __init rtas_flash_init(void) |
1da177e4 LT |
707 | { |
708 | int rc; | |
709 | ||
710 | if (rtas_token("ibm,update-flash-64-and-reboot") == | |
711 | RTAS_UNKNOWN_SERVICE) { | |
712 | printk(KERN_ERR "rtas_flash: no firmware flash support\n"); | |
713 | return 1; | |
714 | } | |
715 | ||
188917e1 | 716 | firmware_flash_pde = create_flash_pde("powerpc/rtas/" |
1da177e4 LT |
717 | FIRMWARE_FLASH_NAME, |
718 | &rtas_flash_operations); | |
719 | if (firmware_flash_pde == NULL) { | |
720 | rc = -ENOMEM; | |
721 | goto cleanup; | |
722 | } | |
723 | ||
724 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
725 | sizeof(struct rtas_update_flash_t), | |
726 | firmware_flash_pde); | |
727 | if (rc != 0) | |
728 | goto cleanup; | |
729 | ||
188917e1 | 730 | firmware_update_pde = create_flash_pde("powerpc/rtas/" |
1da177e4 LT |
731 | FIRMWARE_UPDATE_NAME, |
732 | &rtas_flash_operations); | |
733 | if (firmware_update_pde == NULL) { | |
734 | rc = -ENOMEM; | |
735 | goto cleanup; | |
736 | } | |
737 | ||
738 | rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot", | |
739 | sizeof(struct rtas_update_flash_t), | |
740 | firmware_update_pde); | |
741 | if (rc != 0) | |
742 | goto cleanup; | |
743 | ||
188917e1 | 744 | validate_pde = create_flash_pde("powerpc/rtas/" VALIDATE_FLASH_NAME, |
1da177e4 LT |
745 | &validate_flash_operations); |
746 | if (validate_pde == NULL) { | |
747 | rc = -ENOMEM; | |
748 | goto cleanup; | |
749 | } | |
750 | ||
751 | rc = initialize_flash_pde_data("ibm,validate-flash-image", | |
752 | sizeof(struct rtas_validate_flash_t), | |
753 | validate_pde); | |
754 | if (rc != 0) | |
755 | goto cleanup; | |
756 | ||
188917e1 | 757 | manage_pde = create_flash_pde("powerpc/rtas/" MANAGE_FLASH_NAME, |
1da177e4 LT |
758 | &manage_flash_operations); |
759 | if (manage_pde == NULL) { | |
760 | rc = -ENOMEM; | |
761 | goto cleanup; | |
762 | } | |
763 | ||
764 | rc = initialize_flash_pde_data("ibm,manage-flash-image", | |
765 | sizeof(struct rtas_manage_flash_t), | |
766 | manage_pde); | |
767 | if (rc != 0) | |
768 | goto cleanup; | |
769 | ||
f4fcbbe9 | 770 | rtas_flash_term_hook = rtas_flash_firmware; |
ae883cab JR |
771 | |
772 | flash_block_cache = kmem_cache_create("rtas_flash_cache", | |
773 | RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0, | |
20c2df83 | 774 | rtas_block_ctor); |
ae883cab JR |
775 | if (!flash_block_cache) { |
776 | printk(KERN_ERR "%s: failed to create block cache\n", | |
e48b1b45 | 777 | __func__); |
ae883cab JR |
778 | rc = -ENOMEM; |
779 | goto cleanup; | |
780 | } | |
1da177e4 LT |
781 | return 0; |
782 | ||
783 | cleanup: | |
784 | remove_flash_pde(firmware_flash_pde); | |
785 | remove_flash_pde(firmware_update_pde); | |
786 | remove_flash_pde(validate_pde); | |
787 | remove_flash_pde(manage_pde); | |
788 | ||
789 | return rc; | |
790 | } | |
791 | ||
1c21a293 | 792 | static void __exit rtas_flash_cleanup(void) |
1da177e4 | 793 | { |
f4fcbbe9 | 794 | rtas_flash_term_hook = NULL; |
ae883cab JR |
795 | |
796 | if (flash_block_cache) | |
797 | kmem_cache_destroy(flash_block_cache); | |
798 | ||
1da177e4 LT |
799 | remove_flash_pde(firmware_flash_pde); |
800 | remove_flash_pde(firmware_update_pde); | |
801 | remove_flash_pde(validate_pde); | |
802 | remove_flash_pde(manage_pde); | |
803 | } | |
804 | ||
805 | module_init(rtas_flash_init); | |
806 | module_exit(rtas_flash_cleanup); | |
807 | MODULE_LICENSE("GPL"); |