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/ppc64/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/proc_fs.h>
19 #include <asm/delay.h>
20 #include <asm/uaccess.h>
22 #include <asm/abs_addr.h>
24 #define MODULE_VERS "1.0"
25 #define MODULE_NAME "rtas_flash"
27 #define FIRMWARE_FLASH_NAME "firmware_flash"
28 #define FIRMWARE_UPDATE_NAME "firmware_update"
29 #define MANAGE_FLASH_NAME "manage_flash"
30 #define VALIDATE_FLASH_NAME "validate_flash"
32 /* General RTAS Status Codes */
33 #define RTAS_RC_SUCCESS 0
34 #define RTAS_RC_HW_ERR -1
35 #define RTAS_RC_BUSY -2
37 /* Flash image status values */
38 #define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */
39 #define FLASH_NO_OP -1099 /* No operation initiated by user */
40 #define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */
41 #define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */
42 #define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */
43 #define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */
45 /* Manage image status values */
46 #define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */
47 #define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */
48 #define MANAGE_NO_OP -1099 /* No operation initiated by user */
49 #define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */
50 #define MANAGE_HW_ERR -1 /* RTAS Hardware Error */
52 /* Validate image status values */
53 #define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */
54 #define VALIDATE_NO_OP -1099 /* No operation initiated by the user */
55 #define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */
56 #define VALIDATE_READY -1001 /* Firmware image ready for validation */
57 #define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */
58 #define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */
59 #define VALIDATE_TMP_UPDATE 0 /* Validate Return Status */
60 #define VALIDATE_FLASH_AUTH 1 /* Validate Return Status */
61 #define VALIDATE_INVALID_IMG 2 /* Validate Return Status */
62 #define VALIDATE_CUR_UNKNOWN 3 /* Validate Return Status */
63 #define VALIDATE_TMP_COMMIT_DL 4 /* Validate Return Status */
64 #define VALIDATE_TMP_COMMIT 5 /* Validate Return Status */
65 #define VALIDATE_TMP_UPDATE_DL 6 /* Validate Return Status */
67 /* ibm,manage-flash-image operation tokens */
68 #define RTAS_REJECT_TMP_IMG 0
69 #define RTAS_COMMIT_TMP_IMG 1
72 #define VALIDATE_BUF_SIZE 4096
73 #define RTAS_MSG_MAXLEN 64
75 /* Quirk - RTAS requires 4k list length and block size */
76 #define RTAS_BLKLIST_LENGTH 4096
77 #define RTAS_BLK_SIZE 4096
84 /* This struct is very similar but not identical to
85 * that needed by the rtas flash update.
86 * All we need to do for rtas is rewrite num_blocks
87 * into a version/length and translate the pointers
90 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
91 struct flash_block_list {
92 unsigned long num_blocks;
93 struct flash_block_list *next;
94 struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
96 struct flash_block_list_header { /* just the header of flash_block_list */
97 unsigned long num_blocks;
98 struct flash_block_list *next;
101 static struct flash_block_list_header rtas_firmware_flash_list = {0, NULL};
103 /* Use slab cache to guarantee 4k alignment */
104 static struct kmem_cache *flash_block_cache = NULL;
106 #define FLASH_BLOCK_LIST_VERSION (1UL)
108 /* Local copy of the flash block list.
109 * We only allow one open of the flash proc file and create this
110 * list as we go. This list will be put in the
111 * rtas_firmware_flash_list var once it is fully read.
113 * For convenience as we build the list we use virtual addrs,
114 * we do not fill in the version number, and the length field
115 * is treated as the number of entries currently in the block
116 * (i.e. not a byte count). This is all fixed on release.
119 /* Status int must be first member of struct */
120 struct rtas_update_flash_t
122 int status; /* Flash update status */
123 struct flash_block_list *flist; /* Local copy of flash block list */
126 /* Status int must be first member of struct */
127 struct rtas_manage_flash_t
129 int status; /* Returned status */
130 unsigned int op; /* Reject or commit image */
133 /* Status int must be first member of struct */
134 struct rtas_validate_flash_t
136 int status; /* Returned status */
137 char buf[VALIDATE_BUF_SIZE]; /* Candidate image buffer */
138 unsigned int buf_size; /* Size of image buf */
139 unsigned int update_results; /* Update results token */
142 static DEFINE_SPINLOCK(flash_file_open_lock);
143 static struct proc_dir_entry *firmware_flash_pde;
144 static struct proc_dir_entry *firmware_update_pde;
145 static struct proc_dir_entry *validate_pde;
146 static struct proc_dir_entry *manage_pde;
148 /* Do simple sanity checks on the flash image. */
149 static int flash_list_valid(struct flash_block_list *flist)
151 struct flash_block_list *f;
153 unsigned long block_size, image_size;
155 /* Paranoid self test here. We also collect the image size. */
157 for (f = flist; f; f = f->next) {
158 for (i = 0; i < f->num_blocks; i++) {
159 if (f->blocks[i].data == NULL) {
160 return FLASH_IMG_NULL_DATA;
162 block_size = f->blocks[i].length;
163 if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
164 return FLASH_IMG_BAD_LEN;
166 image_size += block_size;
170 if (image_size < (256 << 10)) {
175 printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
177 return FLASH_IMG_READY;
180 static void free_flash_list(struct flash_block_list *f)
182 struct flash_block_list *next;
186 for (i = 0; i < f->num_blocks; i++)
187 kmem_cache_free(flash_block_cache, f->blocks[i].data);
189 kmem_cache_free(flash_block_cache, f);
194 static int rtas_flash_release(struct inode *inode, struct file *file)
196 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
197 struct rtas_update_flash_t *uf;
199 uf = (struct rtas_update_flash_t *) dp->data;
201 /* File was opened in write mode for a new flash attempt */
202 /* Clear saved list */
203 if (rtas_firmware_flash_list.next) {
204 free_flash_list(rtas_firmware_flash_list.next);
205 rtas_firmware_flash_list.next = NULL;
208 if (uf->status != FLASH_AUTH)
209 uf->status = flash_list_valid(uf->flist);
211 if (uf->status == FLASH_IMG_READY)
212 rtas_firmware_flash_list.next = uf->flist;
214 free_flash_list(uf->flist);
219 atomic_dec(&dp->count);
223 static void 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 sprintf(buf, "error: unexpected status value %d\n", status);
254 /* Reading the proc file will show status (not the firmware contents) */
255 static ssize_t rtas_flash_read(struct file *file, char __user *buf,
256 size_t count, loff_t *ppos)
258 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
259 struct rtas_update_flash_t *uf;
260 char msg[RTAS_MSG_MAXLEN];
263 uf = (struct rtas_update_flash_t *) dp->data;
265 if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) {
266 get_flash_status_msg(uf->status, msg);
267 } else { /* FIRMWARE_UPDATE_NAME */
268 sprintf(msg, "%d\n", uf->status);
270 msglen = strlen(msg);
274 if (ppos && *ppos != 0)
275 return 0; /* be cheap */
277 if (!access_ok(VERIFY_WRITE, buf, msglen))
280 if (copy_to_user(buf, msg, msglen))
288 /* constructor for flash_block_cache */
289 void rtas_block_ctor(struct kmem_cache *cache, void *ptr)
291 memset(ptr, 0, RTAS_BLK_SIZE);
294 /* We could be much more efficient here. But to keep this function
295 * simple we allocate a page to the block list no matter how small the
296 * count is. If the system is low on memory it will be just as well
299 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
300 size_t count, loff_t *off)
302 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
303 struct rtas_update_flash_t *uf;
306 struct flash_block_list *fl;
308 uf = (struct rtas_update_flash_t *) dp->data;
310 if (uf->status == FLASH_AUTH || count == 0)
311 return count; /* discard data */
313 /* In the case that the image is not ready for flashing, the memory
314 * allocated for the block list will be freed upon the release of the
317 if (uf->flist == NULL) {
318 uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
325 fl = fl->next; /* seek to last block_list for append */
326 next_free = fl->num_blocks;
327 if (next_free == FLASH_BLOCKS_PER_NODE) {
328 /* Need to allocate another block_list */
329 fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
336 if (count > RTAS_BLK_SIZE)
337 count = RTAS_BLK_SIZE;
338 p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
342 if(copy_from_user(p, buffer, count)) {
343 kmem_cache_free(flash_block_cache, p);
346 fl->blocks[next_free].data = p;
347 fl->blocks[next_free].length = count;
353 static int rtas_excl_open(struct inode *inode, struct file *file)
355 struct proc_dir_entry *dp = PDE(inode);
357 /* Enforce exclusive open with use count of PDE */
358 spin_lock(&flash_file_open_lock);
359 if (atomic_read(&dp->count) > 1) {
360 spin_unlock(&flash_file_open_lock);
364 atomic_inc(&dp->count);
365 spin_unlock(&flash_file_open_lock);
370 static int rtas_excl_release(struct inode *inode, struct file *file)
372 struct proc_dir_entry *dp = PDE(inode);
374 atomic_dec(&dp->count);
379 static void manage_flash(struct rtas_manage_flash_t *args_buf)
384 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1,
385 1, NULL, args_buf->op);
386 } while (rtas_busy_delay(rc));
388 args_buf->status = rc;
391 static ssize_t manage_flash_read(struct file *file, char __user *buf,
392 size_t count, loff_t *ppos)
394 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
395 struct rtas_manage_flash_t *args_buf;
396 char msg[RTAS_MSG_MAXLEN];
399 args_buf = (struct rtas_manage_flash_t *) dp->data;
400 if (args_buf == NULL)
403 msglen = sprintf(msg, "%d\n", args_buf->status);
407 if (ppos && *ppos != 0)
408 return 0; /* be cheap */
410 if (!access_ok(VERIFY_WRITE, buf, msglen))
413 if (copy_to_user(buf, msg, msglen))
421 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
422 size_t count, loff_t *off)
424 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
425 struct rtas_manage_flash_t *args_buf;
426 const char reject_str[] = "0";
427 const char commit_str[] = "1";
431 args_buf = (struct rtas_manage_flash_t *) dp->data;
432 if ((args_buf->status == MANAGE_AUTH) || (count == 0))
437 if (count > 9) count = 9;
438 if (copy_from_user (stkbuf, buf, count)) {
441 if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0)
442 op = RTAS_REJECT_TMP_IMG;
443 else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0)
444 op = RTAS_COMMIT_TMP_IMG;
447 if (op == -1) /* buf is empty, or contains invalid string */
451 manage_flash(args_buf);
456 static void validate_flash(struct rtas_validate_flash_t *args_buf)
458 int token = rtas_token("ibm,validate-flash-image");
464 spin_lock(&rtas_data_buf_lock);
465 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
466 rc = rtas_call(token, 2, 2, &update_results,
467 (u32) __pa(rtas_data_buf), args_buf->buf_size);
468 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
469 spin_unlock(&rtas_data_buf_lock);
470 } while (rtas_busy_delay(rc));
472 args_buf->status = rc;
473 args_buf->update_results = update_results;
476 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
481 if (args_buf->status >= VALIDATE_TMP_UPDATE) {
482 n = sprintf(msg, "%d\n", args_buf->update_results);
483 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
484 (args_buf->update_results == VALIDATE_TMP_UPDATE))
485 n += sprintf(msg + n, "%s\n", args_buf->buf);
487 n = sprintf(msg, "%d\n", args_buf->status);
492 static ssize_t validate_flash_read(struct file *file, char __user *buf,
493 size_t count, loff_t *ppos)
495 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
496 struct rtas_validate_flash_t *args_buf;
497 char msg[RTAS_MSG_MAXLEN];
500 args_buf = (struct rtas_validate_flash_t *) dp->data;
502 if (ppos && *ppos != 0)
503 return 0; /* be cheap */
505 msglen = get_validate_flash_msg(args_buf, msg);
509 if (!access_ok(VERIFY_WRITE, buf, msglen))
512 if (copy_to_user(buf, msg, msglen))
520 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
521 size_t count, loff_t *off)
523 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
524 struct rtas_validate_flash_t *args_buf;
527 args_buf = (struct rtas_validate_flash_t *) dp->data;
529 if (dp->data == NULL) {
530 dp->data = kmalloc(sizeof(struct rtas_validate_flash_t),
532 if (dp->data == NULL)
536 /* We are only interested in the first 4K of the
538 if ((*off >= VALIDATE_BUF_SIZE) ||
539 (args_buf->status == VALIDATE_AUTH)) {
544 if (*off + count >= VALIDATE_BUF_SIZE) {
545 count = VALIDATE_BUF_SIZE - *off;
546 args_buf->status = VALIDATE_READY;
548 args_buf->status = VALIDATE_INCOMPLETE;
551 if (!access_ok(VERIFY_READ, buf, count)) {
555 if (copy_from_user(args_buf->buf + *off, buf, count)) {
570 static int validate_flash_release(struct inode *inode, struct file *file)
572 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
573 struct rtas_validate_flash_t *args_buf;
575 args_buf = (struct rtas_validate_flash_t *) dp->data;
577 if (args_buf->status == VALIDATE_READY) {
578 args_buf->buf_size = VALIDATE_BUF_SIZE;
579 validate_flash(args_buf);
582 /* The matching atomic_inc was in rtas_excl_open() */
583 atomic_dec(&dp->count);
588 static void rtas_flash_firmware(int reboot_type)
590 unsigned long image_size;
591 struct flash_block_list *f, *next, *flist;
592 unsigned long rtas_block_list;
593 int i, status, update_token;
595 if (rtas_firmware_flash_list.next == NULL)
596 return; /* nothing to do */
598 if (reboot_type != SYS_RESTART) {
599 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
600 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
604 update_token = rtas_token("ibm,update-flash-64-and-reboot");
605 if (update_token == RTAS_UNKNOWN_SERVICE) {
606 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
607 "is not available -- not a service partition?\n");
608 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
612 /* NOTE: the "first" block list is a global var with no data
613 * blocks in the kernel data segment. We do this because
614 * we want to ensure this block_list addr is under 4GB.
616 rtas_firmware_flash_list.num_blocks = 0;
617 flist = (struct flash_block_list *)&rtas_firmware_flash_list;
618 rtas_block_list = virt_to_abs(flist);
619 if (rtas_block_list >= 4UL*1024*1024*1024) {
620 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
624 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
625 /* Update the block_list in place. */
627 for (f = flist; f; f = next) {
628 /* Translate data addrs to absolute */
629 for (i = 0; i < f->num_blocks; i++) {
630 f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
631 image_size += f->blocks[i].length;
634 /* Don't translate NULL pointer for last entry */
636 f->next = (struct flash_block_list *)virt_to_abs(f->next);
639 /* make num_blocks into the version/length field */
640 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
643 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
644 printk(KERN_ALERT "FLASH: performing flash and reboot\n");
645 rtas_progress("Flashing \n", 0x0);
646 rtas_progress("Please Wait... ", 0x0);
647 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n");
648 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
649 switch (status) { /* should only get "bad" status */
651 printk(KERN_ALERT "FLASH: success\n");
654 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n");
657 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n");
660 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n");
663 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
668 static void remove_flash_pde(struct proc_dir_entry *dp)
673 remove_proc_entry(dp->name, dp->parent);
677 static int initialize_flash_pde_data(const char *rtas_call_name,
679 struct proc_dir_entry *dp)
684 dp->data = kzalloc(buf_size, GFP_KERNEL);
685 if (dp->data == NULL) {
686 remove_flash_pde(dp);
691 * This code assumes that the status int is the first member of the
694 status = (int *) dp->data;
695 token = rtas_token(rtas_call_name);
696 if (token == RTAS_UNKNOWN_SERVICE)
697 *status = FLASH_AUTH;
699 *status = FLASH_NO_OP;
704 static struct proc_dir_entry *create_flash_pde(const char *filename,
705 const struct file_operations *fops)
707 struct proc_dir_entry *ent = NULL;
709 ent = create_proc_entry(filename, S_IRUSR | S_IWUSR, NULL);
711 ent->proc_fops = fops;
712 ent->owner = THIS_MODULE;
718 static const struct file_operations rtas_flash_operations = {
719 .read = rtas_flash_read,
720 .write = rtas_flash_write,
721 .open = rtas_excl_open,
722 .release = rtas_flash_release,
725 static const struct file_operations manage_flash_operations = {
726 .read = manage_flash_read,
727 .write = manage_flash_write,
728 .open = rtas_excl_open,
729 .release = rtas_excl_release,
732 static const struct file_operations validate_flash_operations = {
733 .read = validate_flash_read,
734 .write = validate_flash_write,
735 .open = rtas_excl_open,
736 .release = validate_flash_release,
739 int __init rtas_flash_init(void)
743 if (rtas_token("ibm,update-flash-64-and-reboot") ==
744 RTAS_UNKNOWN_SERVICE) {
745 printk(KERN_ERR "rtas_flash: no firmware flash support\n");
749 firmware_flash_pde = create_flash_pde("ppc64/rtas/"
751 &rtas_flash_operations);
752 if (firmware_flash_pde == NULL) {
757 rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
758 sizeof(struct rtas_update_flash_t),
763 firmware_update_pde = create_flash_pde("ppc64/rtas/"
764 FIRMWARE_UPDATE_NAME,
765 &rtas_flash_operations);
766 if (firmware_update_pde == NULL) {
771 rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
772 sizeof(struct rtas_update_flash_t),
773 firmware_update_pde);
777 validate_pde = create_flash_pde("ppc64/rtas/" VALIDATE_FLASH_NAME,
778 &validate_flash_operations);
779 if (validate_pde == NULL) {
784 rc = initialize_flash_pde_data("ibm,validate-flash-image",
785 sizeof(struct rtas_validate_flash_t),
790 manage_pde = create_flash_pde("ppc64/rtas/" MANAGE_FLASH_NAME,
791 &manage_flash_operations);
792 if (manage_pde == NULL) {
797 rc = initialize_flash_pde_data("ibm,manage-flash-image",
798 sizeof(struct rtas_manage_flash_t),
803 rtas_flash_term_hook = rtas_flash_firmware;
805 flash_block_cache = kmem_cache_create("rtas_flash_cache",
806 RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
808 if (!flash_block_cache) {
809 printk(KERN_ERR "%s: failed to create block cache\n",
817 remove_flash_pde(firmware_flash_pde);
818 remove_flash_pde(firmware_update_pde);
819 remove_flash_pde(validate_pde);
820 remove_flash_pde(manage_pde);
825 void __exit rtas_flash_cleanup(void)
827 rtas_flash_term_hook = NULL;
829 if (flash_block_cache)
830 kmem_cache_destroy(flash_block_cache);
832 remove_flash_pde(firmware_flash_pde);
833 remove_flash_pde(firmware_update_pde);
834 remove_flash_pde(validate_pde);
835 remove_flash_pde(manage_pde);
838 module_init(rtas_flash_init);
839 module_exit(rtas_flash_cleanup);
840 MODULE_LICENSE("GPL");