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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
95struct 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))
107struct 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
113static struct flash_block_list *rtas_firmware_flash_list;
114
115/* Use slab cache to guarantee 4k alignment */
116static 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 */
134struct 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 */
141struct rtas_manage_flash_t
142{
143 int status; /* Returned status */
144};
145
146/* Status int must be first member of struct */
147struct 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
155static struct rtas_update_flash_t rtas_update_flash_data;
156static struct rtas_manage_flash_t rtas_manage_flash_data;
157static struct rtas_validate_flash_t rtas_validate_flash_data;
158static DEFINE_MUTEX(rtas_update_flash_mutex);
159static DEFINE_MUTEX(rtas_manage_flash_mutex);
160static DEFINE_MUTEX(rtas_validate_flash_mutex);
161
162/* Do simple sanity checks on the flash image. */
163static 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
194static 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
208static 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
237static 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) */
272static 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
289static 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 */
310static 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 */
366static 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
378static 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
393static 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 unsigned int op;
398 char cmd;
399
400 guard(mutex)(&rtas_manage_flash_mutex);
401
402 if ((args_buf->status == MANAGE_AUTH) || (count == 0))
403 return count;
404
405 if (get_user(cmd, buf))
406 return -EFAULT;
407
408 if (cmd == '0')
409 op = RTAS_REJECT_TMP_IMG;
410 else if (cmd == '1')
411 op = RTAS_COMMIT_TMP_IMG;
412 else
413 return -EINVAL;
414
415 manage_flash(args_buf, op);
416 return count;
417}
418
419/*
420 * Validation routines.
421 */
422static void validate_flash(struct rtas_validate_flash_t *args_buf)
423{
424 int token = rtas_function_token(RTAS_FN_IBM_VALIDATE_FLASH_IMAGE);
425 int update_results;
426 s32 rc;
427
428 rc = 0;
429 do {
430 spin_lock(&rtas_data_buf_lock);
431 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
432 rc = rtas_call(token, 2, 2, &update_results,
433 (u32) __pa(rtas_data_buf), args_buf->buf_size);
434 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
435 spin_unlock(&rtas_data_buf_lock);
436 } while (rtas_busy_delay(rc));
437
438 args_buf->status = rc;
439 args_buf->update_results = update_results;
440}
441
442static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
443 char *msg, int msglen)
444{
445 int n;
446
447 if (args_buf->status >= VALIDATE_TMP_UPDATE) {
448 n = sprintf(msg, "%d\n", args_buf->update_results);
449 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
450 (args_buf->update_results == VALIDATE_TMP_UPDATE))
451 n += snprintf(msg + n, msglen - n, "%s\n",
452 args_buf->buf);
453 } else {
454 n = sprintf(msg, "%d\n", args_buf->status);
455 }
456 return n;
457}
458
459static ssize_t validate_flash_read(struct file *file, char __user *buf,
460 size_t count, loff_t *ppos)
461{
462 struct rtas_validate_flash_t *const args_buf =
463 &rtas_validate_flash_data;
464 char msg[VALIDATE_MSG_LEN];
465 int msglen;
466
467 mutex_lock(&rtas_validate_flash_mutex);
468 msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN);
469 mutex_unlock(&rtas_validate_flash_mutex);
470
471 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
472}
473
474static ssize_t validate_flash_write(struct file *file, const char __user *buf,
475 size_t count, loff_t *off)
476{
477 struct rtas_validate_flash_t *const args_buf =
478 &rtas_validate_flash_data;
479
480 guard(mutex)(&rtas_validate_flash_mutex);
481
482 /* We are only interested in the first 4K of the
483 * candidate image */
484 if ((*off >= VALIDATE_BUF_SIZE) ||
485 (args_buf->status == VALIDATE_AUTH)) {
486 *off += count;
487 return count;
488 }
489
490 if (*off + count >= VALIDATE_BUF_SIZE) {
491 count = VALIDATE_BUF_SIZE - *off;
492 args_buf->status = VALIDATE_READY;
493 } else {
494 args_buf->status = VALIDATE_INCOMPLETE;
495 }
496
497 if (!access_ok(buf, count))
498 return -EFAULT;
499
500 if (copy_from_user(args_buf->buf + *off, buf, count))
501 return -EFAULT;
502
503 *off += count;
504 return count;
505}
506
507static int validate_flash_release(struct inode *inode, struct file *file)
508{
509 struct rtas_validate_flash_t *const args_buf =
510 &rtas_validate_flash_data;
511
512 mutex_lock(&rtas_validate_flash_mutex);
513
514 if (args_buf->status == VALIDATE_READY) {
515 args_buf->buf_size = VALIDATE_BUF_SIZE;
516 validate_flash(args_buf);
517 }
518
519 mutex_unlock(&rtas_validate_flash_mutex);
520 return 0;
521}
522
523/*
524 * On-reboot flash update applicator.
525 */
526static void rtas_flash_firmware(int reboot_type)
527{
528 unsigned long image_size;
529 struct flash_block_list *f, *next, *flist;
530 unsigned long rtas_block_list;
531 int i, status, update_token;
532
533 if (rtas_firmware_flash_list == NULL)
534 return; /* nothing to do */
535
536 if (reboot_type != SYS_RESTART) {
537 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
538 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
539 return;
540 }
541
542 update_token = rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT);
543 if (update_token == RTAS_UNKNOWN_SERVICE) {
544 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
545 "is not available -- not a service partition?\n");
546 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
547 return;
548 }
549
550 /*
551 * Just before starting the firmware flash, cancel the event scan work
552 * to avoid any soft lockup issues.
553 */
554 rtas_cancel_event_scan();
555
556 /*
557 * NOTE: the "first" block must be under 4GB, so we create
558 * an entry with no data blocks in the reserved buffer in
559 * the kernel data segment.
560 */
561 spin_lock(&rtas_data_buf_lock);
562 flist = (struct flash_block_list *)&rtas_data_buf[0];
563 flist->num_blocks = 0;
564 flist->next = rtas_firmware_flash_list;
565 rtas_block_list = __pa(flist);
566 if (rtas_block_list >= 4UL*1024*1024*1024) {
567 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
568 spin_unlock(&rtas_data_buf_lock);
569 return;
570 }
571
572 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
573 /* Update the block_list in place. */
574 rtas_firmware_flash_list = NULL; /* too hard to backout on error */
575 image_size = 0;
576 for (f = flist; f; f = next) {
577 /* Translate data addrs to absolute */
578 for (i = 0; i < f->num_blocks; i++) {
579 f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data));
580 image_size += f->blocks[i].length;
581 f->blocks[i].length = cpu_to_be64(f->blocks[i].length);
582 }
583 next = f->next;
584 /* Don't translate NULL pointer for last entry */
585 if (f->next)
586 f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next));
587 else
588 f->next = NULL;
589 /* make num_blocks into the version/length field */
590 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
591 f->num_blocks = cpu_to_be64(f->num_blocks);
592 }
593
594 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
595 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
596 rtas_progress("Flashing \n", 0x0);
597 rtas_progress("Please Wait... ", 0x0);
598 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
599 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
600 switch (status) { /* should only get "bad" status */
601 case 0:
602 printk(KERN_ALERT "FLASH: success\n");
603 break;
604 case -1:
605 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
606 break;
607 case -3:
608 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
609 break;
610 case -4:
611 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
612 break;
613 default:
614 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
615 break;
616 }
617 spin_unlock(&rtas_data_buf_lock);
618}
619
620/*
621 * Manifest of proc files to create
622 */
623struct rtas_flash_file {
624 const char *filename;
625 const rtas_fn_handle_t handle;
626 int *status;
627 const struct proc_ops ops;
628};
629
630static const struct rtas_flash_file rtas_flash_files[] = {
631 {
632 .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
633 .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT,
634 .status = &rtas_update_flash_data.status,
635 .ops.proc_read = rtas_flash_read_msg,
636 .ops.proc_write = rtas_flash_write,
637 .ops.proc_release = rtas_flash_release,
638 .ops.proc_lseek = default_llseek,
639 },
640 {
641 .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
642 .handle = RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT,
643 .status = &rtas_update_flash_data.status,
644 .ops.proc_read = rtas_flash_read_num,
645 .ops.proc_write = rtas_flash_write,
646 .ops.proc_release = rtas_flash_release,
647 .ops.proc_lseek = default_llseek,
648 },
649 {
650 .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME,
651 .handle = RTAS_FN_IBM_VALIDATE_FLASH_IMAGE,
652 .status = &rtas_validate_flash_data.status,
653 .ops.proc_read = validate_flash_read,
654 .ops.proc_write = validate_flash_write,
655 .ops.proc_release = validate_flash_release,
656 .ops.proc_lseek = default_llseek,
657 },
658 {
659 .filename = "powerpc/rtas/" MANAGE_FLASH_NAME,
660 .handle = RTAS_FN_IBM_MANAGE_FLASH_IMAGE,
661 .status = &rtas_manage_flash_data.status,
662 .ops.proc_read = manage_flash_read,
663 .ops.proc_write = manage_flash_write,
664 .ops.proc_lseek = default_llseek,
665 }
666};
667
668static int __init rtas_flash_init(void)
669{
670 int i;
671
672 if (rtas_function_token(RTAS_FN_IBM_UPDATE_FLASH_64_AND_REBOOT) == RTAS_UNKNOWN_SERVICE) {
673 pr_info("rtas_flash: no firmware flash support\n");
674 return -EINVAL;
675 }
676
677 rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
678 if (!rtas_validate_flash_data.buf)
679 return -ENOMEM;
680
681 flash_block_cache = kmem_cache_create_usercopy("rtas_flash_cache",
682 RTAS_BLK_SIZE, RTAS_BLK_SIZE,
683 0, 0, RTAS_BLK_SIZE, NULL);
684 if (!flash_block_cache) {
685 printk(KERN_ERR "%s: failed to create block cache\n",
686 __func__);
687 goto enomem_buf;
688 }
689
690 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
691 const struct rtas_flash_file *f = &rtas_flash_files[i];
692 int token;
693
694 if (!proc_create(f->filename, 0600, NULL, &f->ops))
695 goto enomem;
696
697 /*
698 * This code assumes that the status int is the first member of the
699 * struct
700 */
701 token = rtas_function_token(f->handle);
702 if (token == RTAS_UNKNOWN_SERVICE)
703 *f->status = FLASH_AUTH;
704 else
705 *f->status = FLASH_NO_OP;
706 }
707
708 rtas_flash_term_hook = rtas_flash_firmware;
709 return 0;
710
711enomem:
712 while (--i >= 0) {
713 const struct rtas_flash_file *f = &rtas_flash_files[i];
714 remove_proc_entry(f->filename, NULL);
715 }
716
717 kmem_cache_destroy(flash_block_cache);
718enomem_buf:
719 kfree(rtas_validate_flash_data.buf);
720 return -ENOMEM;
721}
722
723static void __exit rtas_flash_cleanup(void)
724{
725 int i;
726
727 rtas_flash_term_hook = NULL;
728
729 if (rtas_firmware_flash_list) {
730 free_flash_list(rtas_firmware_flash_list);
731 rtas_firmware_flash_list = NULL;
732 }
733
734 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
735 const struct rtas_flash_file *f = &rtas_flash_files[i];
736 remove_proc_entry(f->filename, NULL);
737 }
738
739 kmem_cache_destroy(flash_block_cache);
740 kfree(rtas_validate_flash_data.buf);
741}
742
743module_init(rtas_flash_init);
744module_exit(rtas_flash_cleanup);
745MODULE_DESCRIPTION("PPC procfs firmware flash interface");
746MODULE_LICENSE("GPL");