2 * c 2001 PPC 64 Team, IBM Corp
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * /proc/powerpc/rtas/firmware_flash interface
11 * This file implements a firmware_flash interface to pump a firmware
12 * image into the kernel. At reboot time rtas_restart() will see the
13 * firmware image and flash it as it reboots (see rtas.c).
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/proc_fs.h>
20 #include <linux/reboot.h>
21 #include <asm/delay.h>
22 #include <asm/uaccess.h>
25 #define MODULE_VERS "1.0"
26 #define MODULE_NAME "rtas_flash"
28 #define FIRMWARE_FLASH_NAME "firmware_flash"
29 #define FIRMWARE_UPDATE_NAME "firmware_update"
30 #define MANAGE_FLASH_NAME "manage_flash"
31 #define VALIDATE_FLASH_NAME "validate_flash"
33 /* General RTAS Status Codes */
34 #define RTAS_RC_SUCCESS 0
35 #define RTAS_RC_HW_ERR -1
36 #define RTAS_RC_BUSY -2
38 /* Flash image status values */
39 #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */
40 #define FLASH_NO_OP -1099 /* No operation initiated by user */
41 #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */
42 #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */
43 #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */
44 #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */
46 /* Manage image status values */
47 #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */
48 #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */
49 #define MANAGE_NO_OP -1099 /* No operation initiated by user */
50 #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */
51 #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */
53 /* Validate image status values */
54 #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */
55 #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */
56 #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */
57 #define VALIDATE_READY -1001 /* Firmware image ready for validation */
58 #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */
59 #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */
61 /* ibm,validate-flash-image update result tokens */
62 #define VALIDATE_TMP_UPDATE 0 /* T side will be updated */
63 #define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */
64 #define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */
65 #define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */
67 * Current T side will be committed to P side before being replace with new
68 * image, and the new image is downlevel from current image
70 #define VALIDATE_TMP_COMMIT_DL 4
72 * Current T side will be committed to P side before being replaced with new
75 #define VALIDATE_TMP_COMMIT 5
77 * T side will be updated with a downlevel image
79 #define VALIDATE_TMP_UPDATE_DL 6
81 * The candidate image's release date is later than the system's firmware
82 * service entitlement date - service warranty period has expired
84 #define VALIDATE_OUT_OF_WRNTY 7
86 /* ibm,manage-flash-image operation tokens */
87 #define RTAS_REJECT_TMP_IMG 0
88 #define RTAS_COMMIT_TMP_IMG 1
91 #define VALIDATE_BUF_SIZE 4096
92 #define VALIDATE_MSG_LEN 256
93 #define RTAS_MSG_MAXLEN 64
95 /* Quirk - RTAS requires 4k list length and block size */
96 #define RTAS_BLKLIST_LENGTH 4096
97 #define RTAS_BLK_SIZE 4096
101 unsigned long length;
104 /* This struct is very similar but not identical to
105 * that needed by the rtas flash update.
106 * All we need to do for rtas is rewrite num_blocks
107 * into a version/length and translate the pointers
110 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
111 struct flash_block_list {
112 unsigned long num_blocks;
113 struct flash_block_list *next;
114 struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
117 static struct flash_block_list *rtas_firmware_flash_list;
119 /* Use slab cache to guarantee 4k alignment */
120 static struct kmem_cache *flash_block_cache = NULL;
122 #define FLASH_BLOCK_LIST_VERSION (1UL)
125 * Local copy of the flash block list.
127 * The rtas_firmware_flash_list varable will be
128 * set once the data is fully read.
130 * For convenience as we build the list we use virtual addrs,
131 * we do not fill in the version number, and the length field
132 * is treated as the number of entries currently in the block
133 * (i.e. not a byte count). This is all fixed when calling
137 /* Status int must be first member of struct */
138 struct rtas_update_flash_t
140 int status; /* Flash update status */
141 struct flash_block_list *flist; /* Local copy of flash block list */
144 /* Status int must be first member of struct */
145 struct rtas_manage_flash_t
147 int status; /* Returned status */
150 /* Status int must be first member of struct */
151 struct rtas_validate_flash_t
153 int status; /* Returned status */
154 char *buf; /* Candidate image buffer */
155 unsigned int buf_size; /* Size of image buf */
156 unsigned int update_results; /* Update results token */
159 static struct rtas_update_flash_t rtas_update_flash_data;
160 static struct rtas_manage_flash_t rtas_manage_flash_data;
161 static struct rtas_validate_flash_t rtas_validate_flash_data;
162 static DEFINE_MUTEX(rtas_update_flash_mutex);
163 static DEFINE_MUTEX(rtas_manage_flash_mutex);
164 static DEFINE_MUTEX(rtas_validate_flash_mutex);
166 /* Do simple sanity checks on the flash image. */
167 static int flash_list_valid(struct flash_block_list *flist)
169 struct flash_block_list *f;
171 unsigned long block_size, image_size;
173 /* Paranoid self test here. We also collect the image size. */
175 for (f = flist; f; f = f->next) {
176 for (i = 0; i < f->num_blocks; i++) {
177 if (f->blocks[i].data == NULL) {
178 return FLASH_IMG_NULL_DATA;
180 block_size = f->blocks[i].length;
181 if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
182 return FLASH_IMG_BAD_LEN;
184 image_size += block_size;
188 if (image_size < (256 << 10)) {
193 printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
195 return FLASH_IMG_READY;
198 static void free_flash_list(struct flash_block_list *f)
200 struct flash_block_list *next;
204 for (i = 0; i < f->num_blocks; i++)
205 kmem_cache_free(flash_block_cache, f->blocks[i].data);
207 kmem_cache_free(flash_block_cache, f);
212 static int rtas_flash_release(struct inode *inode, struct file *file)
214 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
216 mutex_lock(&rtas_update_flash_mutex);
219 /* File was opened in write mode for a new flash attempt */
220 /* Clear saved list */
221 if (rtas_firmware_flash_list) {
222 free_flash_list(rtas_firmware_flash_list);
223 rtas_firmware_flash_list = NULL;
226 if (uf->status != FLASH_AUTH)
227 uf->status = flash_list_valid(uf->flist);
229 if (uf->status == FLASH_IMG_READY)
230 rtas_firmware_flash_list = uf->flist;
232 free_flash_list(uf->flist);
237 mutex_unlock(&rtas_update_flash_mutex);
241 static size_t get_flash_status_msg(int status, char *buf)
248 msg = "error: this partition does not have service authority\n";
251 msg = "info: no firmware image for flash\n";
253 case FLASH_IMG_SHORT:
254 msg = "error: flash image short\n";
256 case FLASH_IMG_BAD_LEN:
257 msg = "error: internal error bad length\n";
259 case FLASH_IMG_NULL_DATA:
260 msg = "error: internal error null data\n";
262 case FLASH_IMG_READY:
263 msg = "ready: firmware image ready for flash on reboot\n";
266 return sprintf(buf, "error: unexpected status value %d\n",
271 memcpy(buf, msg, len + 1);
275 /* Reading the proc file will show status (not the firmware contents) */
276 static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf,
277 size_t count, loff_t *ppos)
279 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
280 char msg[RTAS_MSG_MAXLEN];
284 mutex_lock(&rtas_update_flash_mutex);
286 mutex_unlock(&rtas_update_flash_mutex);
288 /* Read as text message */
289 len = get_flash_status_msg(status, msg);
290 return simple_read_from_buffer(buf, count, ppos, msg, len);
293 static ssize_t rtas_flash_read_num(struct file *file, char __user *buf,
294 size_t count, loff_t *ppos)
296 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
297 char msg[RTAS_MSG_MAXLEN];
300 mutex_lock(&rtas_update_flash_mutex);
302 mutex_unlock(&rtas_update_flash_mutex);
305 sprintf(msg, "%d\n", status);
306 return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
309 /* We could be much more efficient here. But to keep this function
310 * simple we allocate a page to the block list no matter how small the
311 * count is. If the system is low on memory it will be just as well
314 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
315 size_t count, loff_t *off)
317 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
320 struct flash_block_list *fl;
322 mutex_lock(&rtas_update_flash_mutex);
324 if (uf->status == FLASH_AUTH || count == 0)
325 goto out; /* discard data */
327 /* In the case that the image is not ready for flashing, the memory
328 * allocated for the block list will be freed upon the release of the
331 if (uf->flist == NULL) {
332 uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
339 fl = fl->next; /* seek to last block_list for append */
340 next_free = fl->num_blocks;
341 if (next_free == FLASH_BLOCKS_PER_NODE) {
342 /* Need to allocate another block_list */
343 fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
350 if (count > RTAS_BLK_SIZE)
351 count = RTAS_BLK_SIZE;
352 p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
356 if(copy_from_user(p, buffer, count)) {
357 kmem_cache_free(flash_block_cache, p);
361 fl->blocks[next_free].data = p;
362 fl->blocks[next_free].length = count;
365 mutex_unlock(&rtas_update_flash_mutex);
371 mutex_unlock(&rtas_update_flash_mutex);
376 * Flash management routines.
378 static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
383 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1,
385 } while (rtas_busy_delay(rc));
387 args_buf->status = rc;
390 static ssize_t manage_flash_read(struct file *file, char __user *buf,
391 size_t count, loff_t *ppos)
393 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
394 char msg[RTAS_MSG_MAXLEN];
397 mutex_lock(&rtas_manage_flash_mutex);
398 status = args_buf->status;
399 mutex_unlock(&rtas_manage_flash_mutex);
401 msglen = sprintf(msg, "%d\n", status);
402 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
405 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
406 size_t count, loff_t *off)
408 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
409 static const char reject_str[] = "0";
410 static const char commit_str[] = "1";
414 mutex_lock(&rtas_manage_flash_mutex);
416 if ((args_buf->status == MANAGE_AUTH) || (count == 0))
421 if (count > 9) count = 9;
423 if (copy_from_user (stkbuf, buf, count))
425 if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0)
426 op = RTAS_REJECT_TMP_IMG;
427 else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0)
428 op = RTAS_COMMIT_TMP_IMG;
431 if (op == -1) { /* buf is empty, or contains invalid string */
436 manage_flash(args_buf, op);
438 mutex_unlock(&rtas_manage_flash_mutex);
442 mutex_unlock(&rtas_manage_flash_mutex);
447 * Validation routines.
449 static void validate_flash(struct rtas_validate_flash_t *args_buf)
451 int token = rtas_token("ibm,validate-flash-image");
457 spin_lock(&rtas_data_buf_lock);
458 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
459 rc = rtas_call(token, 2, 2, &update_results,
460 (u32) __pa(rtas_data_buf), args_buf->buf_size);
461 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
462 spin_unlock(&rtas_data_buf_lock);
463 } while (rtas_busy_delay(rc));
465 args_buf->status = rc;
466 args_buf->update_results = update_results;
469 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
470 char *msg, int msglen)
474 if (args_buf->status >= VALIDATE_TMP_UPDATE) {
475 n = sprintf(msg, "%d\n", args_buf->update_results);
476 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
477 (args_buf->update_results == VALIDATE_TMP_UPDATE))
478 n += snprintf(msg + n, msglen - n, "%s\n",
481 n = sprintf(msg, "%d\n", args_buf->status);
486 static ssize_t validate_flash_read(struct file *file, char __user *buf,
487 size_t count, loff_t *ppos)
489 struct rtas_validate_flash_t *const args_buf =
490 &rtas_validate_flash_data;
491 char msg[VALIDATE_MSG_LEN];
494 mutex_lock(&rtas_validate_flash_mutex);
495 msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN);
496 mutex_unlock(&rtas_validate_flash_mutex);
498 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
501 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
502 size_t count, loff_t *off)
504 struct rtas_validate_flash_t *const args_buf =
505 &rtas_validate_flash_data;
508 mutex_lock(&rtas_validate_flash_mutex);
510 /* We are only interested in the first 4K of the
512 if ((*off >= VALIDATE_BUF_SIZE) ||
513 (args_buf->status == VALIDATE_AUTH)) {
515 mutex_unlock(&rtas_validate_flash_mutex);
519 if (*off + count >= VALIDATE_BUF_SIZE) {
520 count = VALIDATE_BUF_SIZE - *off;
521 args_buf->status = VALIDATE_READY;
523 args_buf->status = VALIDATE_INCOMPLETE;
526 if (!access_ok(VERIFY_READ, buf, count)) {
530 if (copy_from_user(args_buf->buf + *off, buf, count)) {
538 mutex_unlock(&rtas_validate_flash_mutex);
542 static int validate_flash_release(struct inode *inode, struct file *file)
544 struct rtas_validate_flash_t *const args_buf =
545 &rtas_validate_flash_data;
547 mutex_lock(&rtas_validate_flash_mutex);
549 if (args_buf->status == VALIDATE_READY) {
550 args_buf->buf_size = VALIDATE_BUF_SIZE;
551 validate_flash(args_buf);
554 mutex_unlock(&rtas_validate_flash_mutex);
559 * On-reboot flash update applicator.
561 static void rtas_flash_firmware(int reboot_type)
563 unsigned long image_size;
564 struct flash_block_list *f, *next, *flist;
565 unsigned long rtas_block_list;
566 int i, status, update_token;
568 if (rtas_firmware_flash_list == NULL)
569 return; /* nothing to do */
571 if (reboot_type != SYS_RESTART) {
572 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
573 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
577 update_token = rtas_token("ibm,update-flash-64-and-reboot");
578 if (update_token == RTAS_UNKNOWN_SERVICE) {
579 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
580 "is not available -- not a service partition?\n");
581 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
586 * Just before starting the firmware flash, cancel the event scan work
587 * to avoid any soft lockup issues.
589 rtas_cancel_event_scan();
592 * NOTE: the "first" block must be under 4GB, so we create
593 * an entry with no data blocks in the reserved buffer in
594 * the kernel data segment.
596 spin_lock(&rtas_data_buf_lock);
597 flist = (struct flash_block_list *)&rtas_data_buf[0];
598 flist->num_blocks = 0;
599 flist->next = rtas_firmware_flash_list;
600 rtas_block_list = __pa(flist);
601 if (rtas_block_list >= 4UL*1024*1024*1024) {
602 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
603 spin_unlock(&rtas_data_buf_lock);
607 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
608 /* Update the block_list in place. */
609 rtas_firmware_flash_list = NULL; /* too hard to backout on error */
611 for (f = flist; f; f = next) {
612 /* Translate data addrs to absolute */
613 for (i = 0; i < f->num_blocks; i++) {
614 f->blocks[i].data = (char *)__pa(f->blocks[i].data);
615 image_size += f->blocks[i].length;
618 /* Don't translate NULL pointer for last entry */
620 f->next = (struct flash_block_list *)__pa(f->next);
623 /* make num_blocks into the version/length field */
624 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
627 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
628 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
629 rtas_progress("Flashing \n", 0x0);
630 rtas_progress("Please Wait... ", 0x0);
631 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
632 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
633 switch (status) { /* should only get "bad" status */
635 printk(KERN_ALERT "FLASH: success\n");
638 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
641 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
644 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
647 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
650 spin_unlock(&rtas_data_buf_lock);
654 * Manifest of proc files to create
656 struct rtas_flash_file {
657 const char *filename;
658 const char *rtas_call_name;
660 const struct file_operations fops;
663 static const struct rtas_flash_file rtas_flash_files[] = {
665 .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
666 .rtas_call_name = "ibm,update-flash-64-and-reboot",
667 .status = &rtas_update_flash_data.status,
668 .fops.read = rtas_flash_read_msg,
669 .fops.write = rtas_flash_write,
670 .fops.release = rtas_flash_release,
671 .fops.llseek = default_llseek,
674 .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
675 .rtas_call_name = "ibm,update-flash-64-and-reboot",
676 .status = &rtas_update_flash_data.status,
677 .fops.read = rtas_flash_read_num,
678 .fops.write = rtas_flash_write,
679 .fops.release = rtas_flash_release,
680 .fops.llseek = default_llseek,
683 .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME,
684 .rtas_call_name = "ibm,validate-flash-image",
685 .status = &rtas_validate_flash_data.status,
686 .fops.read = validate_flash_read,
687 .fops.write = validate_flash_write,
688 .fops.release = validate_flash_release,
689 .fops.llseek = default_llseek,
692 .filename = "powerpc/rtas/" MANAGE_FLASH_NAME,
693 .rtas_call_name = "ibm,manage-flash-image",
694 .status = &rtas_manage_flash_data.status,
695 .fops.read = manage_flash_read,
696 .fops.write = manage_flash_write,
697 .fops.llseek = default_llseek,
701 static int __init rtas_flash_init(void)
705 if (rtas_token("ibm,update-flash-64-and-reboot") ==
706 RTAS_UNKNOWN_SERVICE) {
707 pr_info("rtas_flash: no firmware flash support\n");
711 rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
712 if (!rtas_validate_flash_data.buf)
715 flash_block_cache = kmem_cache_create("rtas_flash_cache",
716 RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
718 if (!flash_block_cache) {
719 printk(KERN_ERR "%s: failed to create block cache\n",
724 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
725 const struct rtas_flash_file *f = &rtas_flash_files[i];
728 if (!proc_create(f->filename, S_IRUSR | S_IWUSR, NULL, &f->fops))
732 * This code assumes that the status int is the first member of the
735 token = rtas_token(f->rtas_call_name);
736 if (token == RTAS_UNKNOWN_SERVICE)
737 *f->status = FLASH_AUTH;
739 *f->status = FLASH_NO_OP;
742 rtas_flash_term_hook = rtas_flash_firmware;
747 const struct rtas_flash_file *f = &rtas_flash_files[i];
748 remove_proc_entry(f->filename, NULL);
751 kmem_cache_destroy(flash_block_cache);
753 kfree(rtas_validate_flash_data.buf);
757 static void __exit rtas_flash_cleanup(void)
761 rtas_flash_term_hook = NULL;
763 if (rtas_firmware_flash_list) {
764 free_flash_list(rtas_firmware_flash_list);
765 rtas_firmware_flash_list = NULL;
768 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
769 const struct rtas_flash_file *f = &rtas_flash_files[i];
770 remove_proc_entry(f->filename, NULL);
773 kmem_cache_destroy(flash_block_cache);
774 kfree(rtas_validate_flash_data.buf);
777 module_init(rtas_flash_init);
778 module_exit(rtas_flash_cleanup);
779 MODULE_LICENSE("GPL");