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 */
60 #define VALIDATE_TMP_UPDATE 0 /* Validate Return Status */
61 #define VALIDATE_FLASH_AUTH 1 /* Validate Return Status */
62 #define VALIDATE_INVALID_IMG 2 /* Validate Return Status */
63 #define VALIDATE_CUR_UNKNOWN 3 /* Validate Return Status */
64 #define VALIDATE_TMP_COMMIT_DL 4 /* Validate Return Status */
65 #define VALIDATE_TMP_COMMIT 5 /* Validate Return Status */
66 #define VALIDATE_TMP_UPDATE_DL 6 /* Validate Return Status */
68 /* ibm,manage-flash-image operation tokens */
69 #define RTAS_REJECT_TMP_IMG 0
70 #define RTAS_COMMIT_TMP_IMG 1
73 #define VALIDATE_BUF_SIZE 4096
74 #define RTAS_MSG_MAXLEN 64
76 /* Quirk - RTAS requires 4k list length and block size */
77 #define RTAS_BLKLIST_LENGTH 4096
78 #define RTAS_BLK_SIZE 4096
85 /* This struct is very similar but not identical to
86 * that needed by the rtas flash update.
87 * All we need to do for rtas is rewrite num_blocks
88 * into a version/length and translate the pointers
91 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
92 struct flash_block_list {
93 unsigned long num_blocks;
94 struct flash_block_list *next;
95 struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
98 static struct flash_block_list *rtas_firmware_flash_list;
100 /* Use slab cache to guarantee 4k alignment */
101 static struct kmem_cache *flash_block_cache = NULL;
103 #define FLASH_BLOCK_LIST_VERSION (1UL)
106 * Local copy of the flash block list.
108 * The rtas_firmware_flash_list varable will be
109 * set once the data is fully read.
111 * For convenience as we build the list we use virtual addrs,
112 * we do not fill in the version number, and the length field
113 * is treated as the number of entries currently in the block
114 * (i.e. not a byte count). This is all fixed when calling
118 /* Status int must be first member of struct */
119 struct rtas_update_flash_t
121 int status; /* Flash update status */
122 struct flash_block_list *flist; /* Local copy of flash block list */
125 /* Status int must be first member of struct */
126 struct rtas_manage_flash_t
128 int status; /* Returned status */
131 /* Status int must be first member of struct */
132 struct rtas_validate_flash_t
134 int status; /* Returned status */
135 char *buf; /* Candidate image buffer */
136 unsigned int buf_size; /* Size of image buf */
137 unsigned int update_results; /* Update results token */
140 static struct rtas_update_flash_t rtas_update_flash_data;
141 static struct rtas_manage_flash_t rtas_manage_flash_data;
142 static struct rtas_validate_flash_t rtas_validate_flash_data;
143 static DEFINE_MUTEX(rtas_update_flash_mutex);
144 static DEFINE_MUTEX(rtas_manage_flash_mutex);
145 static DEFINE_MUTEX(rtas_validate_flash_mutex);
147 /* Do simple sanity checks on the flash image. */
148 static int flash_list_valid(struct flash_block_list *flist)
150 struct flash_block_list *f;
152 unsigned long block_size, image_size;
154 /* Paranoid self test here. We also collect the image size. */
156 for (f = flist; f; f = f->next) {
157 for (i = 0; i < f->num_blocks; i++) {
158 if (f->blocks[i].data == NULL) {
159 return FLASH_IMG_NULL_DATA;
161 block_size = f->blocks[i].length;
162 if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
163 return FLASH_IMG_BAD_LEN;
165 image_size += block_size;
169 if (image_size < (256 << 10)) {
174 printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
176 return FLASH_IMG_READY;
179 static void free_flash_list(struct flash_block_list *f)
181 struct flash_block_list *next;
185 for (i = 0; i < f->num_blocks; i++)
186 kmem_cache_free(flash_block_cache, f->blocks[i].data);
188 kmem_cache_free(flash_block_cache, f);
193 static int rtas_flash_release(struct inode *inode, struct file *file)
195 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
197 mutex_lock(&rtas_update_flash_mutex);
200 /* File was opened in write mode for a new flash attempt */
201 /* Clear saved list */
202 if (rtas_firmware_flash_list) {
203 free_flash_list(rtas_firmware_flash_list);
204 rtas_firmware_flash_list = NULL;
207 if (uf->status != FLASH_AUTH)
208 uf->status = flash_list_valid(uf->flist);
210 if (uf->status == FLASH_IMG_READY)
211 rtas_firmware_flash_list = uf->flist;
213 free_flash_list(uf->flist);
218 mutex_unlock(&rtas_update_flash_mutex);
222 static size_t get_flash_status_msg(int status, char *buf)
229 msg = "error: this partition does not have service authority\n";
232 msg = "info: no firmware image for flash\n";
234 case FLASH_IMG_SHORT:
235 msg = "error: flash image short\n";
237 case FLASH_IMG_BAD_LEN:
238 msg = "error: internal error bad length\n";
240 case FLASH_IMG_NULL_DATA:
241 msg = "error: internal error null data\n";
243 case FLASH_IMG_READY:
244 msg = "ready: firmware image ready for flash on reboot\n";
247 return sprintf(buf, "error: unexpected status value %d\n",
252 memcpy(buf, msg, len + 1);
256 /* Reading the proc file will show status (not the firmware contents) */
257 static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf,
258 size_t count, loff_t *ppos)
260 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
261 char msg[RTAS_MSG_MAXLEN];
265 mutex_lock(&rtas_update_flash_mutex);
267 mutex_unlock(&rtas_update_flash_mutex);
269 /* Read as text message */
270 len = get_flash_status_msg(status, msg);
271 return simple_read_from_buffer(buf, count, ppos, msg, len);
274 static ssize_t rtas_flash_read_num(struct file *file, char __user *buf,
275 size_t count, loff_t *ppos)
277 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
278 char msg[RTAS_MSG_MAXLEN];
281 mutex_lock(&rtas_update_flash_mutex);
283 mutex_unlock(&rtas_update_flash_mutex);
286 sprintf(msg, "%d\n", status);
287 return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
290 /* constructor for flash_block_cache */
291 static void rtas_block_ctor(void *ptr)
293 memset(ptr, 0, RTAS_BLK_SIZE);
296 /* We could be much more efficient here. But to keep this function
297 * simple we allocate a page to the block list no matter how small the
298 * count is. If the system is low on memory it will be just as well
301 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
302 size_t count, loff_t *off)
304 struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
307 struct flash_block_list *fl;
309 mutex_lock(&rtas_update_flash_mutex);
311 if (uf->status == FLASH_AUTH || count == 0)
312 goto out; /* discard data */
314 /* In the case that the image is not ready for flashing, the memory
315 * allocated for the block list will be freed upon the release of the
318 if (uf->flist == NULL) {
319 uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
326 fl = fl->next; /* seek to last block_list for append */
327 next_free = fl->num_blocks;
328 if (next_free == FLASH_BLOCKS_PER_NODE) {
329 /* Need to allocate another block_list */
330 fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
337 if (count > RTAS_BLK_SIZE)
338 count = RTAS_BLK_SIZE;
339 p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
343 if(copy_from_user(p, buffer, count)) {
344 kmem_cache_free(flash_block_cache, p);
348 fl->blocks[next_free].data = p;
349 fl->blocks[next_free].length = count;
352 mutex_unlock(&rtas_update_flash_mutex);
358 mutex_unlock(&rtas_update_flash_mutex);
363 * Flash management routines.
365 static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
370 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1,
372 } while (rtas_busy_delay(rc));
374 args_buf->status = rc;
377 static ssize_t manage_flash_read(struct file *file, char __user *buf,
378 size_t count, loff_t *ppos)
380 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
381 char msg[RTAS_MSG_MAXLEN];
384 mutex_lock(&rtas_manage_flash_mutex);
385 status = args_buf->status;
386 mutex_unlock(&rtas_manage_flash_mutex);
388 msglen = sprintf(msg, "%d\n", status);
389 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
392 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
393 size_t count, loff_t *off)
395 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
396 static const char reject_str[] = "0";
397 static const char commit_str[] = "1";
401 mutex_lock(&rtas_manage_flash_mutex);
403 if ((args_buf->status == MANAGE_AUTH) || (count == 0))
408 if (count > 9) count = 9;
410 if (copy_from_user (stkbuf, buf, count))
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;
418 if (op == -1) { /* buf is empty, or contains invalid string */
423 manage_flash(args_buf, op);
425 mutex_unlock(&rtas_manage_flash_mutex);
429 mutex_unlock(&rtas_manage_flash_mutex);
434 * Validation routines.
436 static void validate_flash(struct rtas_validate_flash_t *args_buf)
438 int token = rtas_token("ibm,validate-flash-image");
444 spin_lock(&rtas_data_buf_lock);
445 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
446 rc = rtas_call(token, 2, 2, &update_results,
447 (u32) __pa(rtas_data_buf), args_buf->buf_size);
448 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
449 spin_unlock(&rtas_data_buf_lock);
450 } while (rtas_busy_delay(rc));
452 args_buf->status = rc;
453 args_buf->update_results = update_results;
456 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
461 if (args_buf->status >= VALIDATE_TMP_UPDATE) {
462 n = sprintf(msg, "%d\n", args_buf->update_results);
463 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
464 (args_buf->update_results == VALIDATE_TMP_UPDATE))
465 n += sprintf(msg + n, "%s\n", args_buf->buf);
467 n = sprintf(msg, "%d\n", args_buf->status);
472 static ssize_t validate_flash_read(struct file *file, char __user *buf,
473 size_t count, loff_t *ppos)
475 struct rtas_validate_flash_t *const args_buf =
476 &rtas_validate_flash_data;
477 char msg[RTAS_MSG_MAXLEN];
480 mutex_lock(&rtas_validate_flash_mutex);
481 msglen = get_validate_flash_msg(args_buf, msg);
482 mutex_unlock(&rtas_validate_flash_mutex);
484 return simple_read_from_buffer(buf, count, ppos, msg, msglen);
487 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
488 size_t count, loff_t *off)
490 struct rtas_validate_flash_t *const args_buf =
491 &rtas_validate_flash_data;
494 mutex_lock(&rtas_validate_flash_mutex);
496 /* We are only interested in the first 4K of the
498 if ((*off >= VALIDATE_BUF_SIZE) ||
499 (args_buf->status == VALIDATE_AUTH)) {
501 mutex_unlock(&rtas_validate_flash_mutex);
505 if (*off + count >= VALIDATE_BUF_SIZE) {
506 count = VALIDATE_BUF_SIZE - *off;
507 args_buf->status = VALIDATE_READY;
509 args_buf->status = VALIDATE_INCOMPLETE;
512 if (!access_ok(VERIFY_READ, buf, count)) {
516 if (copy_from_user(args_buf->buf + *off, buf, count)) {
524 mutex_unlock(&rtas_validate_flash_mutex);
528 static int validate_flash_release(struct inode *inode, struct file *file)
530 struct rtas_validate_flash_t *const args_buf =
531 &rtas_validate_flash_data;
533 mutex_lock(&rtas_validate_flash_mutex);
535 if (args_buf->status == VALIDATE_READY) {
536 args_buf->buf_size = VALIDATE_BUF_SIZE;
537 validate_flash(args_buf);
540 mutex_unlock(&rtas_validate_flash_mutex);
545 * On-reboot flash update applicator.
547 static void rtas_flash_firmware(int reboot_type)
549 unsigned long image_size;
550 struct flash_block_list *f, *next, *flist;
551 unsigned long rtas_block_list;
552 int i, status, update_token;
554 if (rtas_firmware_flash_list == NULL)
555 return; /* nothing to do */
557 if (reboot_type != SYS_RESTART) {
558 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
559 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
563 update_token = rtas_token("ibm,update-flash-64-and-reboot");
564 if (update_token == RTAS_UNKNOWN_SERVICE) {
565 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
566 "is not available -- not a service partition?\n");
567 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
572 * Just before starting the firmware flash, cancel the event scan work
573 * to avoid any soft lockup issues.
575 rtas_cancel_event_scan();
578 * NOTE: the "first" block must be under 4GB, so we create
579 * an entry with no data blocks in the reserved buffer in
580 * the kernel data segment.
582 spin_lock(&rtas_data_buf_lock);
583 flist = (struct flash_block_list *)&rtas_data_buf[0];
584 flist->num_blocks = 0;
585 flist->next = rtas_firmware_flash_list;
586 rtas_block_list = __pa(flist);
587 if (rtas_block_list >= 4UL*1024*1024*1024) {
588 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
589 spin_unlock(&rtas_data_buf_lock);
593 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
594 /* Update the block_list in place. */
595 rtas_firmware_flash_list = NULL; /* too hard to backout on error */
597 for (f = flist; f; f = next) {
598 /* Translate data addrs to absolute */
599 for (i = 0; i < f->num_blocks; i++) {
600 f->blocks[i].data = (char *)__pa(f->blocks[i].data);
601 image_size += f->blocks[i].length;
604 /* Don't translate NULL pointer for last entry */
606 f->next = (struct flash_block_list *)__pa(f->next);
609 /* make num_blocks into the version/length field */
610 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
613 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
614 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
615 rtas_progress("Flashing \n", 0x0);
616 rtas_progress("Please Wait... ", 0x0);
617 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
618 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
619 switch (status) { /* should only get "bad" status */
621 printk(KERN_ALERT "FLASH: success\n");
624 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
627 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
630 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
633 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
636 spin_unlock(&rtas_data_buf_lock);
640 * Manifest of proc files to create
642 struct rtas_flash_file {
643 const char *filename;
644 const char *rtas_call_name;
646 const struct file_operations fops;
649 static const struct rtas_flash_file rtas_flash_files[] = {
651 .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
652 .rtas_call_name = "ibm,update-flash-64-and-reboot",
653 .status = &rtas_update_flash_data.status,
654 .fops.read = rtas_flash_read_msg,
655 .fops.write = rtas_flash_write,
656 .fops.release = rtas_flash_release,
657 .fops.llseek = default_llseek,
660 .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
661 .rtas_call_name = "ibm,update-flash-64-and-reboot",
662 .status = &rtas_update_flash_data.status,
663 .fops.read = rtas_flash_read_num,
664 .fops.write = rtas_flash_write,
665 .fops.release = rtas_flash_release,
666 .fops.llseek = default_llseek,
669 .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME,
670 .rtas_call_name = "ibm,validate-flash-image",
671 .status = &rtas_validate_flash_data.status,
672 .fops.read = validate_flash_read,
673 .fops.write = validate_flash_write,
674 .fops.release = validate_flash_release,
675 .fops.llseek = default_llseek,
678 .filename = "powerpc/rtas/" MANAGE_FLASH_NAME,
679 .rtas_call_name = "ibm,manage-flash-image",
680 .status = &rtas_manage_flash_data.status,
681 .fops.read = manage_flash_read,
682 .fops.write = manage_flash_write,
683 .fops.llseek = default_llseek,
687 static int __init rtas_flash_init(void)
691 if (rtas_token("ibm,update-flash-64-and-reboot") ==
692 RTAS_UNKNOWN_SERVICE) {
693 pr_info("rtas_flash: no firmware flash support\n");
697 rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
698 if (!rtas_validate_flash_data.buf)
701 flash_block_cache = kmem_cache_create("rtas_flash_cache",
702 RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
704 if (!flash_block_cache) {
705 printk(KERN_ERR "%s: failed to create block cache\n",
710 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
711 const struct rtas_flash_file *f = &rtas_flash_files[i];
714 if (!proc_create(f->filename, S_IRUSR | S_IWUSR, NULL, &f->fops))
718 * This code assumes that the status int is the first member of the
721 token = rtas_token(f->rtas_call_name);
722 if (token == RTAS_UNKNOWN_SERVICE)
723 *f->status = FLASH_AUTH;
725 *f->status = FLASH_NO_OP;
728 rtas_flash_term_hook = rtas_flash_firmware;
733 const struct rtas_flash_file *f = &rtas_flash_files[i];
734 remove_proc_entry(f->filename, NULL);
737 kmem_cache_destroy(flash_block_cache);
739 kfree(rtas_validate_flash_data.buf);
743 static void __exit rtas_flash_cleanup(void)
747 rtas_flash_term_hook = NULL;
749 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
750 const struct rtas_flash_file *f = &rtas_flash_files[i];
751 remove_proc_entry(f->filename, NULL);
754 kmem_cache_destroy(flash_block_cache);
755 kfree(rtas_validate_flash_data.buf);
758 module_init(rtas_flash_init);
759 module_exit(rtas_flash_cleanup);
760 MODULE_LICENSE("GPL");