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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * c 2001 PPC 64 Team, IBM Corp | |
4 | * | |
188917e1 | 5 | * /proc/powerpc/rtas/firmware_flash interface |
1da177e4 LT |
6 | * |
7 | * This file implements a firmware_flash interface to pump a firmware | |
8 | * image into the kernel. At reboot time rtas_restart() will see the | |
9 | * firmware image and flash it as it reboots (see rtas.c). | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
1da177e4 | 15 | #include <linux/proc_fs.h> |
c5f41752 | 16 | #include <linux/reboot.h> |
1da177e4 | 17 | #include <asm/delay.h> |
7c0f6ba6 | 18 | #include <linux/uaccess.h> |
1da177e4 LT |
19 | #include <asm/rtas.h> |
20 | ||
21 | #define MODULE_VERS "1.0" | |
22 | #define MODULE_NAME "rtas_flash" | |
23 | ||
24 | #define FIRMWARE_FLASH_NAME "firmware_flash" | |
25 | #define FIRMWARE_UPDATE_NAME "firmware_update" | |
26 | #define MANAGE_FLASH_NAME "manage_flash" | |
27 | #define VALIDATE_FLASH_NAME "validate_flash" | |
28 | ||
29 | /* General RTAS Status Codes */ | |
30 | #define RTAS_RC_SUCCESS 0 | |
31 | #define RTAS_RC_HW_ERR -1 | |
32 | #define RTAS_RC_BUSY -2 | |
33 | ||
34 | /* Flash image status values */ | |
35 | #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
36 | #define FLASH_NO_OP -1099 /* No operation initiated by user */ | |
37 | #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ | |
38 | #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ | |
39 | #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ | |
40 | #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ | |
41 | ||
42 | /* Manage image status values */ | |
43 | #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
44 | #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ | |
45 | #define MANAGE_NO_OP -1099 /* No operation initiated by user */ | |
46 | #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
47 | #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ | |
48 | ||
49 | /* Validate image status values */ | |
50 | #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ | |
51 | #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ | |
52 | #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ | |
53 | #define VALIDATE_READY -1001 /* Firmware image ready for validation */ | |
54 | #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ | |
55 | #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ | |
f51005d7 VH |
56 | |
57 | /* ibm,validate-flash-image update result tokens */ | |
58 | #define VALIDATE_TMP_UPDATE 0 /* T side will be updated */ | |
59 | #define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */ | |
60 | #define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */ | |
61 | #define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */ | |
62 | /* | |
63 | * Current T side will be committed to P side before being replace with new | |
64 | * image, and the new image is downlevel from current image | |
65 | */ | |
66 | #define VALIDATE_TMP_COMMIT_DL 4 | |
67 | /* | |
68 | * Current T side will be committed to P side before being replaced with new | |
69 | * image | |
70 | */ | |
71 | #define VALIDATE_TMP_COMMIT 5 | |
72 | /* | |
73 | * T side will be updated with a downlevel image | |
74 | */ | |
75 | #define VALIDATE_TMP_UPDATE_DL 6 | |
fd2d37c8 VH |
76 | /* |
77 | * The candidate image's release date is later than the system's firmware | |
78 | * service entitlement date - service warranty period has expired | |
79 | */ | |
80 | #define VALIDATE_OUT_OF_WRNTY 7 | |
1da177e4 LT |
81 | |
82 | /* ibm,manage-flash-image operation tokens */ | |
83 | #define RTAS_REJECT_TMP_IMG 0 | |
84 | #define RTAS_COMMIT_TMP_IMG 1 | |
85 | ||
86 | /* Array sizes */ | |
87 | #define VALIDATE_BUF_SIZE 4096 | |
a94a1472 | 88 | #define VALIDATE_MSG_LEN 256 |
1da177e4 LT |
89 | #define RTAS_MSG_MAXLEN 64 |
90 | ||
ae883cab JR |
91 | /* Quirk - RTAS requires 4k list length and block size */ |
92 | #define RTAS_BLKLIST_LENGTH 4096 | |
93 | #define RTAS_BLK_SIZE 4096 | |
94 | ||
f4fcbbe9 PM |
95 | struct flash_block { |
96 | char *data; | |
97 | unsigned long length; | |
98 | }; | |
99 | ||
100 | /* This struct is very similar but not identical to | |
101 | * that needed by the rtas flash update. | |
102 | * All we need to do for rtas is rewrite num_blocks | |
103 | * into a version/length and translate the pointers | |
104 | * to absolute. | |
105 | */ | |
ae883cab | 106 | #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) |
f4fcbbe9 PM |
107 | struct flash_block_list { |
108 | unsigned long num_blocks; | |
109 | struct flash_block_list *next; | |
110 | struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; | |
111 | }; | |
f4fcbbe9 | 112 | |
bd2b64a1 | 113 | static struct flash_block_list *rtas_firmware_flash_list; |
f4fcbbe9 | 114 | |
ae883cab | 115 | /* Use slab cache to guarantee 4k alignment */ |
e18b890b | 116 | static struct kmem_cache *flash_block_cache = NULL; |
ae883cab | 117 | |
f4fcbbe9 PM |
118 | #define FLASH_BLOCK_LIST_VERSION (1UL) |
119 | ||
e8eeded3 DH |
120 | /* |
121 | * Local copy of the flash block list. | |
122 | * | |
123 | * The rtas_firmware_flash_list varable will be | |
bd2b64a1 | 124 | * set once the data is fully read. |
1da177e4 LT |
125 | * |
126 | * For convenience as we build the list we use virtual addrs, | |
127 | * we do not fill in the version number, and the length field | |
128 | * is treated as the number of entries currently in the block | |
bd2b64a1 MM |
129 | * (i.e. not a byte count). This is all fixed when calling |
130 | * the flash routine. | |
1da177e4 LT |
131 | */ |
132 | ||
133 | /* Status int must be first member of struct */ | |
134 | struct rtas_update_flash_t | |
135 | { | |
136 | int status; /* Flash update status */ | |
137 | struct flash_block_list *flist; /* Local copy of flash block list */ | |
138 | }; | |
139 | ||
140 | /* Status int must be first member of struct */ | |
141 | struct rtas_manage_flash_t | |
142 | { | |
143 | int status; /* Returned status */ | |
1da177e4 LT |
144 | }; |
145 | ||
146 | /* Status int must be first member of struct */ | |
147 | struct rtas_validate_flash_t | |
148 | { | |
149 | int status; /* Returned status */ | |
e8eeded3 | 150 | char *buf; /* Candidate image buffer */ |
1da177e4 LT |
151 | unsigned int buf_size; /* Size of image buf */ |
152 | unsigned int update_results; /* Update results token */ | |
153 | }; | |
154 | ||
e8eeded3 DH |
155 | static struct rtas_update_flash_t rtas_update_flash_data; |
156 | static struct rtas_manage_flash_t rtas_manage_flash_data; | |
157 | static struct rtas_validate_flash_t rtas_validate_flash_data; | |
158 | static DEFINE_MUTEX(rtas_update_flash_mutex); | |
159 | static DEFINE_MUTEX(rtas_manage_flash_mutex); | |
160 | static DEFINE_MUTEX(rtas_validate_flash_mutex); | |
1da177e4 LT |
161 | |
162 | /* Do simple sanity checks on the flash image. */ | |
163 | static int flash_list_valid(struct flash_block_list *flist) | |
164 | { | |
165 | struct flash_block_list *f; | |
166 | int i; | |
167 | unsigned long block_size, image_size; | |
168 | ||
169 | /* Paranoid self test here. We also collect the image size. */ | |
170 | image_size = 0; | |
171 | for (f = flist; f; f = f->next) { | |
172 | for (i = 0; i < f->num_blocks; i++) { | |
173 | if (f->blocks[i].data == NULL) { | |
174 | return FLASH_IMG_NULL_DATA; | |
175 | } | |
176 | block_size = f->blocks[i].length; | |
ae883cab | 177 | if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { |
1da177e4 LT |
178 | return FLASH_IMG_BAD_LEN; |
179 | } | |
180 | image_size += block_size; | |
181 | } | |
182 | } | |
183 | ||
184 | if (image_size < (256 << 10)) { | |
185 | if (image_size < 2) | |
186 | return FLASH_NO_OP; | |
187 | } | |
188 | ||
189 | printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); | |
190 | ||
191 | return FLASH_IMG_READY; | |
192 | } | |
193 | ||
194 | static void free_flash_list(struct flash_block_list *f) | |
195 | { | |
196 | struct flash_block_list *next; | |
197 | int i; | |
198 | ||
199 | while (f) { | |
200 | for (i = 0; i < f->num_blocks; i++) | |
ae883cab | 201 | kmem_cache_free(flash_block_cache, f->blocks[i].data); |
1da177e4 | 202 | next = f->next; |
ae883cab | 203 | kmem_cache_free(flash_block_cache, f); |
1da177e4 LT |
204 | f = next; |
205 | } | |
206 | } | |
207 | ||
208 | static int rtas_flash_release(struct inode *inode, struct file *file) | |
209 | { | |
e8eeded3 DH |
210 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
211 | ||
212 | mutex_lock(&rtas_update_flash_mutex); | |
213 | ||
1da177e4 LT |
214 | if (uf->flist) { |
215 | /* File was opened in write mode for a new flash attempt */ | |
216 | /* Clear saved list */ | |
bd2b64a1 MM |
217 | if (rtas_firmware_flash_list) { |
218 | free_flash_list(rtas_firmware_flash_list); | |
219 | rtas_firmware_flash_list = NULL; | |
1da177e4 LT |
220 | } |
221 | ||
222 | if (uf->status != FLASH_AUTH) | |
223 | uf->status = flash_list_valid(uf->flist); | |
224 | ||
225 | if (uf->status == FLASH_IMG_READY) | |
bd2b64a1 | 226 | rtas_firmware_flash_list = uf->flist; |
1da177e4 LT |
227 | else |
228 | free_flash_list(uf->flist); | |
229 | ||
230 | uf->flist = NULL; | |
231 | } | |
232 | ||
e8eeded3 | 233 | mutex_unlock(&rtas_update_flash_mutex); |
1da177e4 LT |
234 | return 0; |
235 | } | |
236 | ||
e8eeded3 | 237 | static size_t get_flash_status_msg(int status, char *buf) |
1da177e4 | 238 | { |
e8eeded3 DH |
239 | const char *msg; |
240 | size_t len; | |
1da177e4 LT |
241 | |
242 | switch (status) { | |
243 | case FLASH_AUTH: | |
244 | msg = "error: this partition does not have service authority\n"; | |
245 | break; | |
246 | case FLASH_NO_OP: | |
247 | msg = "info: no firmware image for flash\n"; | |
248 | break; | |
249 | case FLASH_IMG_SHORT: | |
250 | msg = "error: flash image short\n"; | |
251 | break; | |
252 | case FLASH_IMG_BAD_LEN: | |
253 | msg = "error: internal error bad length\n"; | |
254 | break; | |
255 | case FLASH_IMG_NULL_DATA: | |
256 | msg = "error: internal error null data\n"; | |
257 | break; | |
258 | case FLASH_IMG_READY: | |
259 | msg = "ready: firmware image ready for flash on reboot\n"; | |
260 | break; | |
261 | default: | |
e8eeded3 DH |
262 | return sprintf(buf, "error: unexpected status value %d\n", |
263 | status); | |
1da177e4 LT |
264 | } |
265 | ||
e8eeded3 DH |
266 | len = strlen(msg); |
267 | memcpy(buf, msg, len + 1); | |
268 | return len; | |
1da177e4 LT |
269 | } |
270 | ||
271 | /* Reading the proc file will show status (not the firmware contents) */ | |
e8eeded3 DH |
272 | static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf, |
273 | size_t count, loff_t *ppos) | |
1da177e4 | 274 | { |
e8eeded3 | 275 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
1da177e4 | 276 | char msg[RTAS_MSG_MAXLEN]; |
e8eeded3 DH |
277 | size_t len; |
278 | int status; | |
1da177e4 | 279 | |
e8eeded3 DH |
280 | mutex_lock(&rtas_update_flash_mutex); |
281 | status = uf->status; | |
282 | mutex_unlock(&rtas_update_flash_mutex); | |
1da177e4 | 283 | |
e8eeded3 DH |
284 | /* Read as text message */ |
285 | len = get_flash_status_msg(status, msg); | |
286 | return simple_read_from_buffer(buf, count, ppos, msg, len); | |
287 | } | |
288 | ||
289 | static ssize_t rtas_flash_read_num(struct file *file, char __user *buf, | |
290 | size_t count, loff_t *ppos) | |
291 | { | |
292 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; | |
293 | char msg[RTAS_MSG_MAXLEN]; | |
294 | int status; | |
1da177e4 | 295 | |
e8eeded3 DH |
296 | mutex_lock(&rtas_update_flash_mutex); |
297 | status = uf->status; | |
298 | mutex_unlock(&rtas_update_flash_mutex); | |
299 | ||
300 | /* Read as number */ | |
301 | sprintf(msg, "%d\n", status); | |
4c4a5cf6 | 302 | return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg)); |
1da177e4 LT |
303 | } |
304 | ||
305 | /* We could be much more efficient here. But to keep this function | |
306 | * simple we allocate a page to the block list no matter how small the | |
307 | * count is. If the system is low on memory it will be just as well | |
308 | * that we fail.... | |
309 | */ | |
efa54579 | 310 | static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, |
1da177e4 LT |
311 | size_t count, loff_t *off) |
312 | { | |
e8eeded3 | 313 | struct rtas_update_flash_t *const uf = &rtas_update_flash_data; |
1da177e4 | 314 | char *p; |
e8eeded3 | 315 | int next_free, rc; |
1da177e4 LT |
316 | struct flash_block_list *fl; |
317 | ||
e8eeded3 | 318 | mutex_lock(&rtas_update_flash_mutex); |
1da177e4 LT |
319 | |
320 | if (uf->status == FLASH_AUTH || count == 0) | |
e8eeded3 | 321 | goto out; /* discard data */ |
1da177e4 LT |
322 | |
323 | /* In the case that the image is not ready for flashing, the memory | |
324 | * allocated for the block list will be freed upon the release of the | |
325 | * proc file | |
326 | */ | |
327 | if (uf->flist == NULL) { | |
fb4696c3 | 328 | uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); |
1da177e4 | 329 | if (!uf->flist) |
e8eeded3 | 330 | goto nomem; |
1da177e4 LT |
331 | } |
332 | ||
333 | fl = uf->flist; | |
334 | while (fl->next) | |
335 | fl = fl->next; /* seek to last block_list for append */ | |
336 | next_free = fl->num_blocks; | |
337 | if (next_free == FLASH_BLOCKS_PER_NODE) { | |
338 | /* Need to allocate another block_list */ | |
fb4696c3 | 339 | fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); |
1da177e4 | 340 | if (!fl->next) |
e8eeded3 | 341 | goto nomem; |
1da177e4 LT |
342 | fl = fl->next; |
343 | next_free = 0; | |
344 | } | |
345 | ||
ae883cab JR |
346 | if (count > RTAS_BLK_SIZE) |
347 | count = RTAS_BLK_SIZE; | |
fb4696c3 | 348 | p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); |
1da177e4 | 349 | if (!p) |
e8eeded3 | 350 | goto nomem; |
1da177e4 LT |
351 | |
352 | if(copy_from_user(p, buffer, count)) { | |
ae883cab | 353 | kmem_cache_free(flash_block_cache, p); |
e8eeded3 DH |
354 | rc = -EFAULT; |
355 | goto error; | |
1da177e4 LT |
356 | } |
357 | fl->blocks[next_free].data = p; | |
358 | fl->blocks[next_free].length = count; | |
359 | fl->num_blocks++; | |
e8eeded3 DH |
360 | out: |
361 | mutex_unlock(&rtas_update_flash_mutex); | |
1da177e4 | 362 | return count; |
1da177e4 | 363 | |
e8eeded3 DH |
364 | nomem: |
365 | rc = -ENOMEM; | |
366 | error: | |
367 | mutex_unlock(&rtas_update_flash_mutex); | |
368 | return rc; | |
1da177e4 LT |
369 | } |
370 | ||
e8eeded3 DH |
371 | /* |
372 | * Flash management routines. | |
373 | */ | |
374 | static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op) | |
1da177e4 | 375 | { |
1da177e4 LT |
376 | s32 rc; |
377 | ||
507279db | 378 | do { |
e8eeded3 DH |
379 | rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1, |
380 | NULL, op); | |
507279db | 381 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
382 | |
383 | args_buf->status = rc; | |
384 | } | |
385 | ||
efa54579 | 386 | static ssize_t manage_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
387 | size_t count, loff_t *ppos) |
388 | { | |
e8eeded3 | 389 | struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; |
1da177e4 | 390 | char msg[RTAS_MSG_MAXLEN]; |
e8eeded3 | 391 | int msglen, status; |
1da177e4 | 392 | |
e8eeded3 DH |
393 | mutex_lock(&rtas_manage_flash_mutex); |
394 | status = args_buf->status; | |
395 | mutex_unlock(&rtas_manage_flash_mutex); | |
1da177e4 | 396 | |
e8eeded3 | 397 | msglen = sprintf(msg, "%d\n", status); |
4c4a5cf6 | 398 | return simple_read_from_buffer(buf, count, ppos, msg, msglen); |
1da177e4 LT |
399 | } |
400 | ||
efa54579 | 401 | static ssize_t manage_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
402 | size_t count, loff_t *off) |
403 | { | |
e8eeded3 DH |
404 | struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; |
405 | static const char reject_str[] = "0"; | |
406 | static const char commit_str[] = "1"; | |
1da177e4 | 407 | char stkbuf[10]; |
e8eeded3 DH |
408 | int op, rc; |
409 | ||
410 | mutex_lock(&rtas_manage_flash_mutex); | |
1da177e4 | 411 | |
1da177e4 | 412 | if ((args_buf->status == MANAGE_AUTH) || (count == 0)) |
e8eeded3 | 413 | goto out; |
1da177e4 LT |
414 | |
415 | op = -1; | |
416 | if (buf) { | |
417 | if (count > 9) count = 9; | |
e8eeded3 DH |
418 | rc = -EFAULT; |
419 | if (copy_from_user (stkbuf, buf, count)) | |
420 | goto error; | |
1da177e4 LT |
421 | if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) |
422 | op = RTAS_REJECT_TMP_IMG; | |
423 | else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) | |
424 | op = RTAS_COMMIT_TMP_IMG; | |
425 | } | |
426 | ||
e8eeded3 DH |
427 | if (op == -1) { /* buf is empty, or contains invalid string */ |
428 | rc = -EINVAL; | |
429 | goto error; | |
430 | } | |
1da177e4 | 431 | |
e8eeded3 DH |
432 | manage_flash(args_buf, op); |
433 | out: | |
434 | mutex_unlock(&rtas_manage_flash_mutex); | |
1da177e4 | 435 | return count; |
e8eeded3 DH |
436 | |
437 | error: | |
438 | mutex_unlock(&rtas_manage_flash_mutex); | |
439 | return rc; | |
1da177e4 LT |
440 | } |
441 | ||
e8eeded3 DH |
442 | /* |
443 | * Validation routines. | |
444 | */ | |
1da177e4 LT |
445 | static void validate_flash(struct rtas_validate_flash_t *args_buf) |
446 | { | |
447 | int token = rtas_token("ibm,validate-flash-image"); | |
1da177e4 LT |
448 | int update_results; |
449 | s32 rc; | |
450 | ||
451 | rc = 0; | |
507279db | 452 | do { |
1da177e4 LT |
453 | spin_lock(&rtas_data_buf_lock); |
454 | memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); | |
455 | rc = rtas_call(token, 2, 2, &update_results, | |
456 | (u32) __pa(rtas_data_buf), args_buf->buf_size); | |
457 | memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); | |
458 | spin_unlock(&rtas_data_buf_lock); | |
507279db | 459 | } while (rtas_busy_delay(rc)); |
1da177e4 LT |
460 | |
461 | args_buf->status = rc; | |
462 | args_buf->update_results = update_results; | |
463 | } | |
464 | ||
465 | static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, | |
a94a1472 | 466 | char *msg, int msglen) |
1da177e4 LT |
467 | { |
468 | int n; | |
469 | ||
470 | if (args_buf->status >= VALIDATE_TMP_UPDATE) { | |
471 | n = sprintf(msg, "%d\n", args_buf->update_results); | |
472 | if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || | |
473 | (args_buf->update_results == VALIDATE_TMP_UPDATE)) | |
a94a1472 VH |
474 | n += snprintf(msg + n, msglen - n, "%s\n", |
475 | args_buf->buf); | |
1da177e4 LT |
476 | } else { |
477 | n = sprintf(msg, "%d\n", args_buf->status); | |
478 | } | |
479 | return n; | |
480 | } | |
481 | ||
efa54579 | 482 | static ssize_t validate_flash_read(struct file *file, char __user *buf, |
1da177e4 LT |
483 | size_t count, loff_t *ppos) |
484 | { | |
e8eeded3 DH |
485 | struct rtas_validate_flash_t *const args_buf = |
486 | &rtas_validate_flash_data; | |
a94a1472 | 487 | char msg[VALIDATE_MSG_LEN]; |
1da177e4 LT |
488 | int msglen; |
489 | ||
e8eeded3 | 490 | mutex_lock(&rtas_validate_flash_mutex); |
a94a1472 | 491 | msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN); |
e8eeded3 | 492 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 | 493 | |
4c4a5cf6 | 494 | return simple_read_from_buffer(buf, count, ppos, msg, msglen); |
1da177e4 LT |
495 | } |
496 | ||
efa54579 | 497 | static ssize_t validate_flash_write(struct file *file, const char __user *buf, |
1da177e4 LT |
498 | size_t count, loff_t *off) |
499 | { | |
e8eeded3 DH |
500 | struct rtas_validate_flash_t *const args_buf = |
501 | &rtas_validate_flash_data; | |
1da177e4 LT |
502 | int rc; |
503 | ||
e8eeded3 | 504 | mutex_lock(&rtas_validate_flash_mutex); |
1da177e4 LT |
505 | |
506 | /* We are only interested in the first 4K of the | |
507 | * candidate image */ | |
508 | if ((*off >= VALIDATE_BUF_SIZE) || | |
509 | (args_buf->status == VALIDATE_AUTH)) { | |
510 | *off += count; | |
e8eeded3 | 511 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 LT |
512 | return count; |
513 | } | |
514 | ||
515 | if (*off + count >= VALIDATE_BUF_SIZE) { | |
516 | count = VALIDATE_BUF_SIZE - *off; | |
517 | args_buf->status = VALIDATE_READY; | |
518 | } else { | |
519 | args_buf->status = VALIDATE_INCOMPLETE; | |
520 | } | |
521 | ||
96d4f267 | 522 | if (!access_ok(buf, count)) { |
1da177e4 LT |
523 | rc = -EFAULT; |
524 | goto done; | |
525 | } | |
526 | if (copy_from_user(args_buf->buf + *off, buf, count)) { | |
527 | rc = -EFAULT; | |
528 | goto done; | |
529 | } | |
530 | ||
531 | *off += count; | |
532 | rc = count; | |
533 | done: | |
e8eeded3 | 534 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 LT |
535 | return rc; |
536 | } | |
537 | ||
538 | static int validate_flash_release(struct inode *inode, struct file *file) | |
539 | { | |
e8eeded3 DH |
540 | struct rtas_validate_flash_t *const args_buf = |
541 | &rtas_validate_flash_data; | |
1da177e4 | 542 | |
e8eeded3 | 543 | mutex_lock(&rtas_validate_flash_mutex); |
1da177e4 LT |
544 | |
545 | if (args_buf->status == VALIDATE_READY) { | |
546 | args_buf->buf_size = VALIDATE_BUF_SIZE; | |
547 | validate_flash(args_buf); | |
548 | } | |
549 | ||
e8eeded3 | 550 | mutex_unlock(&rtas_validate_flash_mutex); |
1da177e4 LT |
551 | return 0; |
552 | } | |
553 | ||
e8eeded3 DH |
554 | /* |
555 | * On-reboot flash update applicator. | |
556 | */ | |
f4fcbbe9 PM |
557 | static void rtas_flash_firmware(int reboot_type) |
558 | { | |
559 | unsigned long image_size; | |
560 | struct flash_block_list *f, *next, *flist; | |
561 | unsigned long rtas_block_list; | |
562 | int i, status, update_token; | |
563 | ||
bd2b64a1 | 564 | if (rtas_firmware_flash_list == NULL) |
f4fcbbe9 PM |
565 | return; /* nothing to do */ |
566 | ||
567 | if (reboot_type != SYS_RESTART) { | |
568 | printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); | |
569 | printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); | |
570 | return; | |
571 | } | |
572 | ||
573 | update_token = rtas_token("ibm,update-flash-64-and-reboot"); | |
574 | if (update_token == RTAS_UNKNOWN_SERVICE) { | |
575 | printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " | |
576 | "is not available -- not a service partition?\n"); | |
577 | printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); | |
578 | return; | |
579 | } | |
580 | ||
df17f56d RN |
581 | /* |
582 | * Just before starting the firmware flash, cancel the event scan work | |
583 | * to avoid any soft lockup issues. | |
584 | */ | |
585 | rtas_cancel_event_scan(); | |
586 | ||
bd2b64a1 MM |
587 | /* |
588 | * NOTE: the "first" block must be under 4GB, so we create | |
589 | * an entry with no data blocks in the reserved buffer in | |
590 | * the kernel data segment. | |
f4fcbbe9 | 591 | */ |
bd2b64a1 MM |
592 | spin_lock(&rtas_data_buf_lock); |
593 | flist = (struct flash_block_list *)&rtas_data_buf[0]; | |
594 | flist->num_blocks = 0; | |
595 | flist->next = rtas_firmware_flash_list; | |
3d267523 | 596 | rtas_block_list = __pa(flist); |
f4fcbbe9 PM |
597 | if (rtas_block_list >= 4UL*1024*1024*1024) { |
598 | printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); | |
bd2b64a1 | 599 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
600 | return; |
601 | } | |
602 | ||
603 | printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); | |
604 | /* Update the block_list in place. */ | |
bd2b64a1 | 605 | rtas_firmware_flash_list = NULL; /* too hard to backout on error */ |
f4fcbbe9 PM |
606 | image_size = 0; |
607 | for (f = flist; f; f = next) { | |
608 | /* Translate data addrs to absolute */ | |
609 | for (i = 0; i < f->num_blocks; i++) { | |
396a3434 | 610 | f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data)); |
f4fcbbe9 | 611 | image_size += f->blocks[i].length; |
396a3434 | 612 | f->blocks[i].length = cpu_to_be64(f->blocks[i].length); |
f4fcbbe9 PM |
613 | } |
614 | next = f->next; | |
615 | /* Don't translate NULL pointer for last entry */ | |
616 | if (f->next) | |
396a3434 | 617 | f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next)); |
f4fcbbe9 PM |
618 | else |
619 | f->next = NULL; | |
620 | /* make num_blocks into the version/length field */ | |
621 | f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); | |
396a3434 | 622 | f->num_blocks = cpu_to_be64(f->num_blocks); |
f4fcbbe9 PM |
623 | } |
624 | ||
625 | printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); | |
626 | printk(KERN_ALERT "FLASH: performing flash and reboot\n"); | |
627 | rtas_progress("Flashing \n", 0x0); | |
628 | rtas_progress("Please Wait... ", 0x0); | |
629 | printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); | |
630 | status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); | |
631 | switch (status) { /* should only get "bad" status */ | |
632 | case 0: | |
633 | printk(KERN_ALERT "FLASH: success\n"); | |
634 | break; | |
635 | case -1: | |
636 | printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); | |
637 | break; | |
638 | case -3: | |
639 | printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); | |
640 | break; | |
641 | case -4: | |
642 | printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); | |
643 | break; | |
644 | default: | |
645 | printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); | |
646 | break; | |
647 | } | |
bd2b64a1 | 648 | spin_unlock(&rtas_data_buf_lock); |
f4fcbbe9 PM |
649 | } |
650 | ||
e8eeded3 DH |
651 | /* |
652 | * Manifest of proc files to create | |
653 | */ | |
654 | struct rtas_flash_file { | |
655 | const char *filename; | |
656 | const char *rtas_call_name; | |
1da177e4 | 657 | int *status; |
e8eeded3 | 658 | const struct file_operations fops; |
1da177e4 LT |
659 | }; |
660 | ||
e8eeded3 DH |
661 | static const struct rtas_flash_file rtas_flash_files[] = { |
662 | { | |
663 | .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME, | |
664 | .rtas_call_name = "ibm,update-flash-64-and-reboot", | |
665 | .status = &rtas_update_flash_data.status, | |
666 | .fops.read = rtas_flash_read_msg, | |
667 | .fops.write = rtas_flash_write, | |
668 | .fops.release = rtas_flash_release, | |
669 | .fops.llseek = default_llseek, | |
670 | }, | |
671 | { | |
672 | .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME, | |
673 | .rtas_call_name = "ibm,update-flash-64-and-reboot", | |
674 | .status = &rtas_update_flash_data.status, | |
675 | .fops.read = rtas_flash_read_num, | |
676 | .fops.write = rtas_flash_write, | |
677 | .fops.release = rtas_flash_release, | |
678 | .fops.llseek = default_llseek, | |
679 | }, | |
680 | { | |
681 | .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME, | |
682 | .rtas_call_name = "ibm,validate-flash-image", | |
683 | .status = &rtas_validate_flash_data.status, | |
684 | .fops.read = validate_flash_read, | |
685 | .fops.write = validate_flash_write, | |
686 | .fops.release = validate_flash_release, | |
687 | .fops.llseek = default_llseek, | |
688 | }, | |
689 | { | |
690 | .filename = "powerpc/rtas/" MANAGE_FLASH_NAME, | |
691 | .rtas_call_name = "ibm,manage-flash-image", | |
692 | .status = &rtas_manage_flash_data.status, | |
693 | .fops.read = manage_flash_read, | |
694 | .fops.write = manage_flash_write, | |
695 | .fops.llseek = default_llseek, | |
696 | } | |
1da177e4 LT |
697 | }; |
698 | ||
1c21a293 | 699 | static int __init rtas_flash_init(void) |
1da177e4 | 700 | { |
e8eeded3 | 701 | int i; |
1da177e4 LT |
702 | |
703 | if (rtas_token("ibm,update-flash-64-and-reboot") == | |
704 | RTAS_UNKNOWN_SERVICE) { | |
0e384983 | 705 | pr_info("rtas_flash: no firmware flash support\n"); |
0c930692 | 706 | return -EINVAL; |
1da177e4 LT |
707 | } |
708 | ||
e8eeded3 DH |
709 | rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL); |
710 | if (!rtas_validate_flash_data.buf) | |
711 | return -ENOMEM; | |
1da177e4 | 712 | |
e8eeded3 DH |
713 | flash_block_cache = kmem_cache_create("rtas_flash_cache", |
714 | RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0, | |
5a148af6 | 715 | NULL); |
e8eeded3 DH |
716 | if (!flash_block_cache) { |
717 | printk(KERN_ERR "%s: failed to create block cache\n", | |
718 | __func__); | |
719 | goto enomem_buf; | |
1da177e4 LT |
720 | } |
721 | ||
e8eeded3 DH |
722 | for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { |
723 | const struct rtas_flash_file *f = &rtas_flash_files[i]; | |
724 | int token; | |
1da177e4 | 725 | |
57ad583f | 726 | if (!proc_create(f->filename, 0600, NULL, &f->fops)) |
e8eeded3 | 727 | goto enomem; |
1da177e4 | 728 | |
e8eeded3 DH |
729 | /* |
730 | * This code assumes that the status int is the first member of the | |
731 | * struct | |
732 | */ | |
733 | token = rtas_token(f->rtas_call_name); | |
734 | if (token == RTAS_UNKNOWN_SERVICE) | |
735 | *f->status = FLASH_AUTH; | |
736 | else | |
737 | *f->status = FLASH_NO_OP; | |
738 | } | |
1da177e4 | 739 | |
f4fcbbe9 | 740 | rtas_flash_term_hook = rtas_flash_firmware; |
1da177e4 LT |
741 | return 0; |
742 | ||
e8eeded3 DH |
743 | enomem: |
744 | while (--i >= 0) { | |
745 | const struct rtas_flash_file *f = &rtas_flash_files[i]; | |
746 | remove_proc_entry(f->filename, NULL); | |
747 | } | |
1da177e4 | 748 | |
e8eeded3 DH |
749 | kmem_cache_destroy(flash_block_cache); |
750 | enomem_buf: | |
751 | kfree(rtas_validate_flash_data.buf); | |
752 | return -ENOMEM; | |
1da177e4 LT |
753 | } |
754 | ||
1c21a293 | 755 | static void __exit rtas_flash_cleanup(void) |
1da177e4 | 756 | { |
e8eeded3 DH |
757 | int i; |
758 | ||
f4fcbbe9 | 759 | rtas_flash_term_hook = NULL; |
ae883cab | 760 | |
ad18a364 VH |
761 | if (rtas_firmware_flash_list) { |
762 | free_flash_list(rtas_firmware_flash_list); | |
763 | rtas_firmware_flash_list = NULL; | |
764 | } | |
765 | ||
e8eeded3 DH |
766 | for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { |
767 | const struct rtas_flash_file *f = &rtas_flash_files[i]; | |
768 | remove_proc_entry(f->filename, NULL); | |
769 | } | |
ae883cab | 770 | |
e8eeded3 DH |
771 | kmem_cache_destroy(flash_block_cache); |
772 | kfree(rtas_validate_flash_data.buf); | |
1da177e4 LT |
773 | } |
774 | ||
775 | module_init(rtas_flash_init); | |
776 | module_exit(rtas_flash_cleanup); | |
777 | MODULE_LICENSE("GPL"); |