1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * c 2001 PPC 64 Team, IBM Corp
4 *
5 * /proc/powerpc/rtas/firmware_flash interface
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>
14 #include <linux/slab.h>
15 #include <linux/proc_fs.h>
16 #include <linux/reboot.h>
17 #include <asm/delay.h>
18 #include <linux/uaccess.h>
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 */
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
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
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
88 #define VALIDATE_MSG_LEN 256
89 #define RTAS_MSG_MAXLEN 64
90
91 /* Quirk - RTAS requires 4k list length and block size */
92 #define RTAS_BLKLIST_LENGTH 4096
93 #define RTAS_BLK_SIZE 4096
94
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 */
106 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
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 };
112
113 static struct flash_block_list *rtas_firmware_flash_list;
114
115 /* Use slab cache to guarantee 4k alignment */
116 static struct kmem_cache *flash_block_cache = NULL;
117
118 #define FLASH_BLOCK_LIST_VERSION (1UL)
119
120 /*
121 * Local copy of the flash block list.
122 *
123 * The rtas_firmware_flash_list variable will be
124 * set once the data is fully read.
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
129 * (i.e. not a byte count). This is all fixed when calling
130 * the flash routine.
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 */
144 };
145
146 /* Status int must be first member of struct */
147 struct rtas_validate_flash_t
148 {
149 int status; /* Returned status */
150 char *buf; /* Candidate image buffer */
151 unsigned int buf_size; /* Size of image buf */
152 unsigned int update_results; /* Update results token */
153 };
154
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);
161
162 /* Do simple sanity checks on the flash image. */
flash_list_valid(struct flash_block_list * flist)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;
177 if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
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
free_flash_list(struct flash_block_list * f)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++)
201 kmem_cache_free(flash_block_cache, f->blocks[i].data);
202 next = f->next;
203 kmem_cache_free(flash_block_cache, f);
204 f = next;
205 }
206 }
207
rtas_flash_release(struct inode * inode,struct file * file)208 static int rtas_flash_release(struct inode *inode, struct file *file)
209 {
210 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
211
212 mutex_lock(&rtas_update_flash_mutex);
213
214 if (uf->flist) {
215 /* File was opened in write mode for a new flash attempt */
216 /* Clear saved list */
217 if (rtas_firmware_flash_list) {
218 free_flash_list(rtas_firmware_flash_list);
219 rtas_firmware_flash_list = NULL;
220 }
221
222 if (uf->status != FLASH_AUTH)
223 uf->status = flash_list_valid(uf->flist);
224
225 if (uf->status == FLASH_IMG_READY)
226 rtas_firmware_flash_list = uf->flist;
227 else
228 free_flash_list(uf->flist);
229
230 uf->flist = NULL;
231 }
232
233 mutex_unlock(&rtas_update_flash_mutex);
234 return 0;
235 }
236
get_flash_status_msg(int status,char * buf)237 static size_t get_flash_status_msg(int status, char *buf)
238 {
239 const char *msg;
240 size_t len;
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:
262 return sprintf(buf, "error: unexpected status value %d\n",
263 status);
264 }
265
266 len = strlen(msg);
267 memcpy(buf, msg, len + 1);
268 return len;
269 }
270
271 /* Reading the proc file will show status (not the firmware contents) */
rtas_flash_read_msg(struct file * file,char __user * buf,size_t count,loff_t * ppos)272 static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf,
273 size_t count, loff_t *ppos)
274 {
275 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
276 char msg[RTAS_MSG_MAXLEN];
277 size_t len;
278 int status;
279
280 mutex_lock(&rtas_update_flash_mutex);
281 status = uf->status;
282 mutex_unlock(&rtas_update_flash_mutex);
283
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
rtas_flash_read_num(struct file * file,char __user * buf,size_t count,loff_t * ppos)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;
295
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);
302 return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
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 */
rtas_flash_write(struct file * file,const char __user * buffer,size_t count,loff_t * off)310 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
311 size_t count, loff_t *off)
312 {
313 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
314 char *p;
315 int next_free, rc;
316 struct flash_block_list *fl;
317
318 mutex_lock(&rtas_update_flash_mutex);
319
320 if (uf->status == FLASH_AUTH || count == 0)
321 goto out; /* discard data */
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) {
328 uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
329 if (!uf->flist)
330 goto nomem;
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 */
339 fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
340 if (!fl->next)
341 goto nomem;
342 fl = fl->next;
343 next_free = 0;
344 }
345
346 if (count > RTAS_BLK_SIZE)
347 count = RTAS_BLK_SIZE;
348 p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
349 if (!p)
350 goto nomem;
351
352 if(copy_from_user(p, buffer, count)) {
353 kmem_cache_free(flash_block_cache, p);
354 rc = -EFAULT;
355 goto error;
356 }
357 fl->blocks[next_free].data = p;
358 fl->blocks[next_free].length = count;
359 fl->num_blocks++;
360 out:
361 mutex_unlock(&rtas_update_flash_mutex);
362 return count;
363
364 nomem:
365 rc = -ENOMEM;
366 error:
367 mutex_unlock(&rtas_update_flash_mutex);
368 return rc;
369 }
370
371 /*
372 * Flash management routines.
373 */
manage_flash(struct rtas_manage_flash_t * args_buf,unsigned int op)374 static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
375 {
376 s32 rc;
377
378 do {
379 rc = rtas_call(rtas_function_token(RTAS_FN_IBM_MANAGE_FLASH_IMAGE), 1, 1,
380 NULL, op);
381 } while (rtas_busy_delay(rc));
382
383 args_buf->status = rc;
384 }
385
manage_flash_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)386 static ssize_t manage_flash_read(struct file *file, char __user *buf,
387 size_t count, loff_t *ppos)
388 {
389 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
390 char msg[RTAS_MSG_MAXLEN];
391 int msglen, status;
392
393 mutex_lock(&rtas_manage_flash_mutex);
394 status = args_buf->status;
395 mutex_unlock(&rtas_manage_flash_mutex);
396
397 msglen = sprintf(msg, "%d\n", status);
398 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
399 }
400
manage_flash_write(struct file * file,const char __user * buf,size_t count,loff_t * off)401 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
402 size_t count, loff_t *off)
403 {
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";
407 char stkbuf[10];
408 int op, rc;
409
410 mutex_lock(&rtas_manage_flash_mutex);
411
412 if ((args_buf->status == MANAGE_AUTH) || (count == 0))
413 goto out;
414
415 op = -1;
416 if (buf) {
417 if (count > 9) count = 9;
418 rc = -EFAULT;
419 if (copy_from_user (stkbuf, buf, count))
420 goto error;
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
427 if (op == -1) { /* buf is empty, or contains invalid string */
428 rc = -EINVAL;
429 goto error;
430 }
431
432 manage_flash(args_buf, op);
433 out:
434 mutex_unlock(&rtas_manage_flash_mutex);
435 return count;
436
437 error:
438 mutex_unlock(&rtas_manage_flash_mutex);
439 return rc;
440 }
441
442 /*
443 * Validation routines.
444 */
validate_flash(struct rtas_validate_flash_t * args_buf)445 static void validate_flash(struct rtas_validate_flash_t *args_buf)
446 {
447 int token = rtas_function_token(RTAS_FN_IBM_VALIDATE_FLASH_IMAGE);
448 int update_results;
449 s32 rc;
450
451 rc = 0;
452 do {
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);
459 } while (rtas_busy_delay(rc));
460
461 args_buf->status = rc;
462 args_buf->update_results = update_results;
463 }
464
get_validate_flash_msg(struct rtas_validate_flash_t * args_buf,char * msg,int msglen)465 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
466 char *msg, int msglen)
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))
474 n += snprintf(msg + n, msglen - n, "%s\n",
475 args_buf->buf);
476 } else {
477 n = sprintf(msg, "%d\n", args_buf->status);
478 }
479 return n;
480 }
481
validate_flash_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)482 static ssize_t validate_flash_read(struct file *file, char __user *buf,
483 size_t count, loff_t *ppos)
484 {
485 struct rtas_validate_flash_t *const args_buf =
486 &rtas_validate_flash_data;
487 char msg[VALIDATE_MSG_LEN];
488 int msglen;
489
490 mutex_lock(&rtas_validate_flash_mutex);
491 msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN);
492 mutex_unlock(&rtas_validate_flash_mutex);
493
494 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
495 }
496
validate_flash_write(struct file * file,const char __user * buf,size_t count,loff_t * off)497 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
498 size_t count, loff_t *off)
499 {
500 struct rtas_validate_flash_t *const args_buf =
501 &rtas_validate_flash_data;
502 int rc;
503
504 mutex_lock(&rtas_validate_flash_mutex);
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;
511 mutex_unlock(&rtas_validate_flash_mutex);
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
522 if (!access_ok(buf, count)) {
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:
534 mutex_unlock(&rtas_validate_flash_mutex);
535 return rc;
536 }
537
validate_flash_release(struct inode * inode,struct file * file)538 static int validate_flash_release(struct inode *inode, struct file *file)
539 {
540 struct rtas_validate_flash_t *const args_buf =
541 &rtas_validate_flash_data;
542
543 mutex_lock(&rtas_validate_flash_mutex);
544
545 if (args_buf->status == VALIDATE_READY) {
546 args_buf->buf_size = VALIDATE_BUF_SIZE;
547 validate_flash(args_buf);
548 }
549
550 mutex_unlock(&rtas_validate_flash_mutex);
551 return 0;
552 }
553
554 /*
555 * On-reboot flash update applicator.
556 */
rtas_flash_firmware(int reboot_type)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
564 if (rtas_firmware_flash_list == NULL)
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_function_token(RTAS_FN_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
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
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.
591 */
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;
596 rtas_block_list = __pa(flist);
597 if (rtas_block_list >= 4UL*1024*1024*1024) {
598 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
599 spin_unlock(&rtas_data_buf_lock);
600 return;
601 }
602
603 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
604 /* Update the block_list in place. */
605 rtas_firmware_flash_list = NULL; /* too hard to backout on error */
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++) {
610 f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data));
611 image_size += f->blocks[i].length;
612 f->blocks[i].length = cpu_to_be64(f->blocks[i].length);
613 }
614 next = f->next;
615 /* Don't translate NULL pointer for last entry */
616 if (f->next)
617 f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next));
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);
622 f->num_blocks = cpu_to_be64(f->num_blocks);
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 }
648 spin_unlock(&rtas_data_buf_lock);
649 }
650
651 /*
652 * Manifest of proc files to create
653 */
654 struct rtas_flash_file {
655 const char *filename;
656 const rtas_fn_handle_t handle;
657 int *status;
658 const struct proc_ops ops;
659 };
660
661 static const struct rtas_flash_file rtas_flash_files[] = {
662 {
663 .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
664 .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT,
665 .status = &rtas_update_flash_data.status,
666 .ops.proc_read = rtas_flash_read_msg,
667 .ops.proc_write = rtas_flash_write,
668 .ops.proc_release = rtas_flash_release,
669 .ops.proc_lseek = default_llseek,
670 },
671 {
672 .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
673 .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT,
674 .status = &rtas_update_flash_data.status,
675 .ops.proc_read = rtas_flash_read_num,
676 .ops.proc_write = rtas_flash_write,
677 .ops.proc_release = rtas_flash_release,
678 .ops.proc_lseek = default_llseek,
679 },
680 {
681 .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME,
682 .handle = RTAS_FN_IBM_VALIDATE_FLASH_IMAGE,
683 .status = &rtas_validate_flash_data.status,
684 .ops.proc_read = validate_flash_read,
685 .ops.proc_write = validate_flash_write,
686 .ops.proc_release = validate_flash_release,
687 .ops.proc_lseek = default_llseek,
688 },
689 {
690 .filename = "powerpc/rtas/" MANAGE_FLASH_NAME,
691 .handle = RTAS_FN_IBM_MANAGE_FLASH_IMAGE,
692 .status = &rtas_manage_flash_data.status,
693 .ops.proc_read = manage_flash_read,
694 .ops.proc_write = manage_flash_write,
695 .ops.proc_lseek = default_llseek,
696 }
697 };
698
rtas_flash_init(void)699 static int __init rtas_flash_init(void)
700 {
701 int i;
702
703 if (rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT) == RTAS_UNKNOWN_SERVICE) {
704 pr_info("rtas_flash: no firmware flash support\n");
705 return -EINVAL;
706 }
707
708 rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
709 if (!rtas_validate_flash_data.buf)
710 return -ENOMEM;
711
712 flash_block_cache = kmem_cache_create_usercopy("rtas_flash_cache",
713 RTAS_BLK_SIZE, RTAS_BLK_SIZE,
714 0, 0, RTAS_BLK_SIZE, NULL);
715 if (!flash_block_cache) {
716 printk(KERN_ERR "%s: failed to create block cache\n",
717 __func__);
718 goto enomem_buf;
719 }
720
721 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
722 const struct rtas_flash_file *f = &rtas_flash_files[i];
723 int token;
724
725 if (!proc_create(f->filename, 0600, NULL, &f->ops))
726 goto enomem;
727
728 /*
729 * This code assumes that the status int is the first member of the
730 * struct
731 */
732 token = rtas_function_token(f->handle);
733 if (token == RTAS_UNKNOWN_SERVICE)
734 *f->status = FLASH_AUTH;
735 else
736 *f->status = FLASH_NO_OP;
737 }
738
739 rtas_flash_term_hook = rtas_flash_firmware;
740 return 0;
741
742 enomem:
743 while (--i >= 0) {
744 const struct rtas_flash_file *f = &rtas_flash_files[i];
745 remove_proc_entry(f->filename, NULL);
746 }
747
748 kmem_cache_destroy(flash_block_cache);
749 enomem_buf:
750 kfree(rtas_validate_flash_data.buf);
751 return -ENOMEM;
752 }
753
rtas_flash_cleanup(void)754 static void __exit rtas_flash_cleanup(void)
755 {
756 int i;
757
758 rtas_flash_term_hook = NULL;
759
760 if (rtas_firmware_flash_list) {
761 free_flash_list(rtas_firmware_flash_list);
762 rtas_firmware_flash_list = NULL;
763 }
764
765 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
766 const struct rtas_flash_file *f = &rtas_flash_files[i];
767 remove_proc_entry(f->filename, NULL);
768 }
769
770 kmem_cache_destroy(flash_block_cache);
771 kfree(rtas_validate_flash_data.buf);
772 }
773
774 module_init(rtas_flash_init);
775 module_exit(rtas_flash_cleanup);
776 MODULE_LICENSE("GPL");
777