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;
316 struct flash_block_list *fl;
317
318 guard(mutex)(&rtas_update_flash_mutex);
319
320 if (uf->status == FLASH_AUTH || count == 0)
321 return count; /* 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 return -ENOMEM;
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 return -ENOMEM;
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 return -ENOMEM;
351
352 if(copy_from_user(p, buffer, count)) {
353 kmem_cache_free(flash_block_cache, p);
354 return -EFAULT;
355 }
356 fl->blocks[next_free].data = p;
357 fl->blocks[next_free].length = count;
358 fl->num_blocks++;
359
360 return count;
361 }
362
363 /*
364 * Flash management routines.
365 */
manage_flash(struct rtas_manage_flash_t * args_buf,unsigned int op)366 static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
367 {
368 s32 rc;
369
370 do {
371 rc = rtas_call(rtas_function_token(RTAS_FN_IBM_MANAGE_FLASH_IMAGE), 1, 1,
372 NULL, op);
373 } while (rtas_busy_delay(rc));
374
375 args_buf->status = rc;
376 }
377
manage_flash_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)378 static ssize_t manage_flash_read(struct file *file, char __user *buf,
379 size_t count, loff_t *ppos)
380 {
381 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
382 char msg[RTAS_MSG_MAXLEN];
383 int msglen, status;
384
385 mutex_lock(&rtas_manage_flash_mutex);
386 status = args_buf->status;
387 mutex_unlock(&rtas_manage_flash_mutex);
388
389 msglen = sprintf(msg, "%d\n", status);
390 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
391 }
392
manage_flash_write(struct file * file,const char __user * buf,size_t count,loff_t * off)393 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
394 size_t count, loff_t *off)
395 {
396 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
397 static const char reject_str[] = "0";
398 static const char commit_str[] = "1";
399 char stkbuf[10];
400 int op;
401
402 guard(mutex)(&rtas_manage_flash_mutex);
403
404 if ((args_buf->status == MANAGE_AUTH) || (count == 0))
405 return count;
406
407 op = -1;
408 if (buf) {
409 if (count > 9) count = 9;
410 if (copy_from_user (stkbuf, buf, count))
411 return -EFAULT;
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
422 manage_flash(args_buf, op);
423 return count;
424 }
425
426 /*
427 * Validation routines.
428 */
validate_flash(struct rtas_validate_flash_t * args_buf)429 static void validate_flash(struct rtas_validate_flash_t *args_buf)
430 {
431 int token = rtas_function_token(RTAS_FN_IBM_VALIDATE_FLASH_IMAGE);
432 int update_results;
433 s32 rc;
434
435 rc = 0;
436 do {
437 spin_lock(&rtas_data_buf_lock);
438 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
439 rc = rtas_call(token, 2, 2, &update_results,
440 (u32) __pa(rtas_data_buf), args_buf->buf_size);
441 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
442 spin_unlock(&rtas_data_buf_lock);
443 } while (rtas_busy_delay(rc));
444
445 args_buf->status = rc;
446 args_buf->update_results = update_results;
447 }
448
get_validate_flash_msg(struct rtas_validate_flash_t * args_buf,char * msg,int msglen)449 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
450 char *msg, int msglen)
451 {
452 int n;
453
454 if (args_buf->status >= VALIDATE_TMP_UPDATE) {
455 n = sprintf(msg, "%d\n", args_buf->update_results);
456 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
457 (args_buf->update_results == VALIDATE_TMP_UPDATE))
458 n += snprintf(msg + n, msglen - n, "%s\n",
459 args_buf->buf);
460 } else {
461 n = sprintf(msg, "%d\n", args_buf->status);
462 }
463 return n;
464 }
465
validate_flash_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)466 static ssize_t validate_flash_read(struct file *file, char __user *buf,
467 size_t count, loff_t *ppos)
468 {
469 struct rtas_validate_flash_t *const args_buf =
470 &rtas_validate_flash_data;
471 char msg[VALIDATE_MSG_LEN];
472 int msglen;
473
474 mutex_lock(&rtas_validate_flash_mutex);
475 msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN);
476 mutex_unlock(&rtas_validate_flash_mutex);
477
478 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
479 }
480
validate_flash_write(struct file * file,const char __user * buf,size_t count,loff_t * off)481 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
482 size_t count, loff_t *off)
483 {
484 struct rtas_validate_flash_t *const args_buf =
485 &rtas_validate_flash_data;
486
487 guard(mutex)(&rtas_validate_flash_mutex);
488
489 /* We are only interested in the first 4K of the
490 * candidate image */
491 if ((*off >= VALIDATE_BUF_SIZE) ||
492 (args_buf->status == VALIDATE_AUTH)) {
493 *off += count;
494 return count;
495 }
496
497 if (*off + count >= VALIDATE_BUF_SIZE) {
498 count = VALIDATE_BUF_SIZE - *off;
499 args_buf->status = VALIDATE_READY;
500 } else {
501 args_buf->status = VALIDATE_INCOMPLETE;
502 }
503
504 if (!access_ok(buf, count))
505 return -EFAULT;
506
507 if (copy_from_user(args_buf->buf + *off, buf, count))
508 return -EFAULT;
509
510 *off += count;
511 return count;
512 }
513
validate_flash_release(struct inode * inode,struct file * file)514 static int validate_flash_release(struct inode *inode, struct file *file)
515 {
516 struct rtas_validate_flash_t *const args_buf =
517 &rtas_validate_flash_data;
518
519 mutex_lock(&rtas_validate_flash_mutex);
520
521 if (args_buf->status == VALIDATE_READY) {
522 args_buf->buf_size = VALIDATE_BUF_SIZE;
523 validate_flash(args_buf);
524 }
525
526 mutex_unlock(&rtas_validate_flash_mutex);
527 return 0;
528 }
529
530 /*
531 * On-reboot flash update applicator.
532 */
rtas_flash_firmware(int reboot_type)533 static void rtas_flash_firmware(int reboot_type)
534 {
535 unsigned long image_size;
536 struct flash_block_list *f, *next, *flist;
537 unsigned long rtas_block_list;
538 int i, status, update_token;
539
540 if (rtas_firmware_flash_list == NULL)
541 return; /* nothing to do */
542
543 if (reboot_type != SYS_RESTART) {
544 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
545 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
546 return;
547 }
548
549 update_token = rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT);
550 if (update_token == RTAS_UNKNOWN_SERVICE) {
551 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
552 "is not available -- not a service partition?\n");
553 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
554 return;
555 }
556
557 /*
558 * Just before starting the firmware flash, cancel the event scan work
559 * to avoid any soft lockup issues.
560 */
561 rtas_cancel_event_scan();
562
563 /*
564 * NOTE: the "first" block must be under 4GB, so we create
565 * an entry with no data blocks in the reserved buffer in
566 * the kernel data segment.
567 */
568 spin_lock(&rtas_data_buf_lock);
569 flist = (struct flash_block_list *)&rtas_data_buf[0];
570 flist->num_blocks = 0;
571 flist->next = rtas_firmware_flash_list;
572 rtas_block_list = __pa(flist);
573 if (rtas_block_list >= 4UL*1024*1024*1024) {
574 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
575 spin_unlock(&rtas_data_buf_lock);
576 return;
577 }
578
579 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
580 /* Update the block_list in place. */
581 rtas_firmware_flash_list = NULL; /* too hard to backout on error */
582 image_size = 0;
583 for (f = flist; f; f = next) {
584 /* Translate data addrs to absolute */
585 for (i = 0; i < f->num_blocks; i++) {
586 f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data));
587 image_size += f->blocks[i].length;
588 f->blocks[i].length = cpu_to_be64(f->blocks[i].length);
589 }
590 next = f->next;
591 /* Don't translate NULL pointer for last entry */
592 if (f->next)
593 f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next));
594 else
595 f->next = NULL;
596 /* make num_blocks into the version/length field */
597 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
598 f->num_blocks = cpu_to_be64(f->num_blocks);
599 }
600
601 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
602 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
603 rtas_progress("Flashing \n", 0x0);
604 rtas_progress("Please Wait... ", 0x0);
605 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
606 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
607 switch (status) { /* should only get "bad" status */
608 case 0:
609 printk(KERN_ALERT "FLASH: success\n");
610 break;
611 case -1:
612 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
613 break;
614 case -3:
615 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
616 break;
617 case -4:
618 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
619 break;
620 default:
621 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
622 break;
623 }
624 spin_unlock(&rtas_data_buf_lock);
625 }
626
627 /*
628 * Manifest of proc files to create
629 */
630 struct rtas_flash_file {
631 const char *filename;
632 const rtas_fn_handle_t handle;
633 int *status;
634 const struct proc_ops ops;
635 };
636
637 static const struct rtas_flash_file rtas_flash_files[] = {
638 {
639 .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
640 .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT,
641 .status = &rtas_update_flash_data.status,
642 .ops.proc_read = rtas_flash_read_msg,
643 .ops.proc_write = rtas_flash_write,
644 .ops.proc_release = rtas_flash_release,
645 .ops.proc_lseek = default_llseek,
646 },
647 {
648 .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
649 .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT,
650 .status = &rtas_update_flash_data.status,
651 .ops.proc_read = rtas_flash_read_num,
652 .ops.proc_write = rtas_flash_write,
653 .ops.proc_release = rtas_flash_release,
654 .ops.proc_lseek = default_llseek,
655 },
656 {
657 .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME,
658 .handle = RTAS_FN_IBM_VALIDATE_FLASH_IMAGE,
659 .status = &rtas_validate_flash_data.status,
660 .ops.proc_read = validate_flash_read,
661 .ops.proc_write = validate_flash_write,
662 .ops.proc_release = validate_flash_release,
663 .ops.proc_lseek = default_llseek,
664 },
665 {
666 .filename = "powerpc/rtas/" MANAGE_FLASH_NAME,
667 .handle = RTAS_FN_IBM_MANAGE_FLASH_IMAGE,
668 .status = &rtas_manage_flash_data.status,
669 .ops.proc_read = manage_flash_read,
670 .ops.proc_write = manage_flash_write,
671 .ops.proc_lseek = default_llseek,
672 }
673 };
674
rtas_flash_init(void)675 static int __init rtas_flash_init(void)
676 {
677 int i;
678
679 if (rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT) == RTAS_UNKNOWN_SERVICE) {
680 pr_info("rtas_flash: no firmware flash support\n");
681 return -EINVAL;
682 }
683
684 rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
685 if (!rtas_validate_flash_data.buf)
686 return -ENOMEM;
687
688 flash_block_cache = kmem_cache_create_usercopy("rtas_flash_cache",
689 RTAS_BLK_SIZE, RTAS_BLK_SIZE,
690 0, 0, RTAS_BLK_SIZE, NULL);
691 if (!flash_block_cache) {
692 printk(KERN_ERR "%s: failed to create block cache\n",
693 __func__);
694 goto enomem_buf;
695 }
696
697 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
698 const struct rtas_flash_file *f = &rtas_flash_files[i];
699 int token;
700
701 if (!proc_create(f->filename, 0600, NULL, &f->ops))
702 goto enomem;
703
704 /*
705 * This code assumes that the status int is the first member of the
706 * struct
707 */
708 token = rtas_function_token(f->handle);
709 if (token == RTAS_UNKNOWN_SERVICE)
710 *f->status = FLASH_AUTH;
711 else
712 *f->status = FLASH_NO_OP;
713 }
714
715 rtas_flash_term_hook = rtas_flash_firmware;
716 return 0;
717
718 enomem:
719 while (--i >= 0) {
720 const struct rtas_flash_file *f = &rtas_flash_files[i];
721 remove_proc_entry(f->filename, NULL);
722 }
723
724 kmem_cache_destroy(flash_block_cache);
725 enomem_buf:
726 kfree(rtas_validate_flash_data.buf);
727 return -ENOMEM;
728 }
729
rtas_flash_cleanup(void)730 static void __exit rtas_flash_cleanup(void)
731 {
732 int i;
733
734 rtas_flash_term_hook = NULL;
735
736 if (rtas_firmware_flash_list) {
737 free_flash_list(rtas_firmware_flash_list);
738 rtas_firmware_flash_list = NULL;
739 }
740
741 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
742 const struct rtas_flash_file *f = &rtas_flash_files[i];
743 remove_proc_entry(f->filename, NULL);
744 }
745
746 kmem_cache_destroy(flash_block_cache);
747 kfree(rtas_validate_flash_data.buf);
748 }
749
750 module_init(rtas_flash_init);
751 module_exit(rtas_flash_cleanup);
752 MODULE_DESCRIPTION("PPC procfs firmware flash interface");
753 MODULE_LICENSE("GPL");
754