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TOMOYO Linux Cross Reference
Linux/arch/powerpc/kernel/rtas_flash.c

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  1 /*
  2  *  c 2001 PPC 64 Team, IBM Corp
  3  *
  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.
  8  *
  9  * /proc/powerpc/rtas/firmware_flash interface
 10  *
 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).
 14  */
 15 
 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>
 23 #include <asm/rtas.h>
 24 
 25 #define MODULE_VERS "1.0"
 26 #define MODULE_NAME "rtas_flash"
 27 
 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"
 32 
 33 /* General RTAS Status Codes */
 34 #define RTAS_RC_SUCCESS  0
 35 #define RTAS_RC_HW_ERR  -1
 36 #define RTAS_RC_BUSY    -2
 37 
 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 */
 45 
 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 */
 52 
 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 
 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 */
 66 /*
 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
 69  */
 70 #define VALIDATE_TMP_COMMIT_DL 4
 71 /*
 72  * Current T side will be committed to P side before being replaced with new
 73  * image
 74  */
 75 #define VALIDATE_TMP_COMMIT    5
 76 /*
 77  * T side will be updated with a downlevel image
 78  */
 79 #define VALIDATE_TMP_UPDATE_DL 6
 80 /*
 81  * The candidate image's release date is later than the system's firmware
 82  * service entitlement date - service warranty period has expired
 83  */
 84 #define VALIDATE_OUT_OF_WRNTY  7
 85 
 86 /* ibm,manage-flash-image operation tokens */
 87 #define RTAS_REJECT_TMP_IMG   0
 88 #define RTAS_COMMIT_TMP_IMG   1
 89 
 90 /* Array sizes */
 91 #define VALIDATE_BUF_SIZE 4096    
 92 #define VALIDATE_MSG_LEN  256
 93 #define RTAS_MSG_MAXLEN   64
 94 
 95 /* Quirk - RTAS requires 4k list length and block size */
 96 #define RTAS_BLKLIST_LENGTH 4096
 97 #define RTAS_BLK_SIZE 4096
 98 
 99 struct flash_block {
100         char *data;
101         unsigned long length;
102 };
103 
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
108  * to absolute.
109  */
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];
115 };
116 
117 static struct flash_block_list *rtas_firmware_flash_list;
118 
119 /* Use slab cache to guarantee 4k alignment */
120 static struct kmem_cache *flash_block_cache = NULL;
121 
122 #define FLASH_BLOCK_LIST_VERSION (1UL)
123 
124 /*
125  * Local copy of the flash block list.
126  *
127  * The rtas_firmware_flash_list varable will be
128  * set once the data is fully read.
129  *
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 
134  * the flash routine.
135  */
136 
137 /* Status int must be first member of struct */
138 struct rtas_update_flash_t
139 {
140         int status;                     /* Flash update status */
141         struct flash_block_list *flist; /* Local copy of flash block list */
142 };
143 
144 /* Status int must be first member of struct */
145 struct rtas_manage_flash_t
146 {
147         int status;                     /* Returned status */
148 };
149 
150 /* Status int must be first member of struct */
151 struct rtas_validate_flash_t
152 {
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 */
157 };
158 
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);
165 
166 /* Do simple sanity checks on the flash image. */
167 static int flash_list_valid(struct flash_block_list *flist)
168 {
169         struct flash_block_list *f;
170         int i;
171         unsigned long block_size, image_size;
172 
173         /* Paranoid self test here.  We also collect the image size. */
174         image_size = 0;
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;
179                         }
180                         block_size = f->blocks[i].length;
181                         if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
182                                 return FLASH_IMG_BAD_LEN;
183                         }
184                         image_size += block_size;
185                 }
186         }
187 
188         if (image_size < (256 << 10)) {
189                 if (image_size < 2) 
190                         return FLASH_NO_OP;
191         }
192 
193         printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
194 
195         return FLASH_IMG_READY;
196 }
197 
198 static void free_flash_list(struct flash_block_list *f)
199 {
200         struct flash_block_list *next;
201         int i;
202 
203         while (f) {
204                 for (i = 0; i < f->num_blocks; i++)
205                         kmem_cache_free(flash_block_cache, f->blocks[i].data);
206                 next = f->next;
207                 kmem_cache_free(flash_block_cache, f);
208                 f = next;
209         }
210 }
211 
212 static int rtas_flash_release(struct inode *inode, struct file *file)
213 {
214         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
215 
216         mutex_lock(&rtas_update_flash_mutex);
217 
218         if (uf->flist) {    
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;
224                 }
225 
226                 if (uf->status != FLASH_AUTH)  
227                         uf->status = flash_list_valid(uf->flist);
228 
229                 if (uf->status == FLASH_IMG_READY) 
230                         rtas_firmware_flash_list = uf->flist;
231                 else
232                         free_flash_list(uf->flist);
233 
234                 uf->flist = NULL;
235         }
236 
237         mutex_unlock(&rtas_update_flash_mutex);
238         return 0;
239 }
240 
241 static size_t get_flash_status_msg(int status, char *buf)
242 {
243         const char *msg;
244         size_t len;
245 
246         switch (status) {
247         case FLASH_AUTH:
248                 msg = "error: this partition does not have service authority\n";
249                 break;
250         case FLASH_NO_OP:
251                 msg = "info: no firmware image for flash\n";
252                 break;
253         case FLASH_IMG_SHORT:
254                 msg = "error: flash image short\n";
255                 break;
256         case FLASH_IMG_BAD_LEN:
257                 msg = "error: internal error bad length\n";
258                 break;
259         case FLASH_IMG_NULL_DATA:
260                 msg = "error: internal error null data\n";
261                 break;
262         case FLASH_IMG_READY:
263                 msg = "ready: firmware image ready for flash on reboot\n";
264                 break;
265         default:
266                 return sprintf(buf, "error: unexpected status value %d\n",
267                                status);
268         }
269 
270         len = strlen(msg);
271         memcpy(buf, msg, len + 1);
272         return len;
273 }
274 
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)
278 {
279         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
280         char msg[RTAS_MSG_MAXLEN];
281         size_t len;
282         int status;
283 
284         mutex_lock(&rtas_update_flash_mutex);
285         status = uf->status;
286         mutex_unlock(&rtas_update_flash_mutex);
287 
288         /* Read as text message */
289         len = get_flash_status_msg(status, msg);
290         return simple_read_from_buffer(buf, count, ppos, msg, len);
291 }
292 
293 static ssize_t rtas_flash_read_num(struct file *file, char __user *buf,
294                                    size_t count, loff_t *ppos)
295 {
296         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
297         char msg[RTAS_MSG_MAXLEN];
298         int status;
299 
300         mutex_lock(&rtas_update_flash_mutex);
301         status = uf->status;
302         mutex_unlock(&rtas_update_flash_mutex);
303 
304         /* Read as number */
305         sprintf(msg, "%d\n", status);
306         return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
307 }
308 
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
312  * that we fail....
313  */
314 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
315                                 size_t count, loff_t *off)
316 {
317         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
318         char *p;
319         int next_free, rc;
320         struct flash_block_list *fl;
321 
322         mutex_lock(&rtas_update_flash_mutex);
323 
324         if (uf->status == FLASH_AUTH || count == 0)
325                 goto out;       /* discard data */
326 
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 
329          * proc file
330          */
331         if (uf->flist == NULL) {
332                 uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
333                 if (!uf->flist)
334                         goto nomem;
335         }
336 
337         fl = uf->flist;
338         while (fl->next)
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);
344                 if (!fl->next)
345                         goto nomem;
346                 fl = fl->next;
347                 next_free = 0;
348         }
349 
350         if (count > RTAS_BLK_SIZE)
351                 count = RTAS_BLK_SIZE;
352         p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
353         if (!p)
354                 goto nomem;
355         
356         if(copy_from_user(p, buffer, count)) {
357                 kmem_cache_free(flash_block_cache, p);
358                 rc = -EFAULT;
359                 goto error;
360         }
361         fl->blocks[next_free].data = p;
362         fl->blocks[next_free].length = count;
363         fl->num_blocks++;
364 out:
365         mutex_unlock(&rtas_update_flash_mutex);
366         return count;
367 
368 nomem:
369         rc = -ENOMEM;
370 error:
371         mutex_unlock(&rtas_update_flash_mutex);
372         return rc;
373 }
374 
375 /*
376  * Flash management routines.
377  */
378 static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
379 {
380         s32 rc;
381 
382         do {
383                 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1,
384                                NULL, op);
385         } while (rtas_busy_delay(rc));
386 
387         args_buf->status = rc;
388 }
389 
390 static ssize_t manage_flash_read(struct file *file, char __user *buf,
391                                size_t count, loff_t *ppos)
392 {
393         struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
394         char msg[RTAS_MSG_MAXLEN];
395         int msglen, status;
396 
397         mutex_lock(&rtas_manage_flash_mutex);
398         status = args_buf->status;
399         mutex_unlock(&rtas_manage_flash_mutex);
400 
401         msglen = sprintf(msg, "%d\n", status);
402         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
403 }
404 
405 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
406                                 size_t count, loff_t *off)
407 {
408         struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
409         static const char reject_str[] = "";
410         static const char commit_str[] = "1";
411         char stkbuf[10];
412         int op, rc;
413 
414         mutex_lock(&rtas_manage_flash_mutex);
415 
416         if ((args_buf->status == MANAGE_AUTH) || (count == 0))
417                 goto out;
418                 
419         op = -1;
420         if (buf) {
421                 if (count > 9) count = 9;
422                 rc = -EFAULT;
423                 if (copy_from_user (stkbuf, buf, count))
424                         goto error;
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;
429         }
430         
431         if (op == -1) {   /* buf is empty, or contains invalid string */
432                 rc = -EINVAL;
433                 goto error;
434         }
435 
436         manage_flash(args_buf, op);
437 out:
438         mutex_unlock(&rtas_manage_flash_mutex);
439         return count;
440 
441 error:
442         mutex_unlock(&rtas_manage_flash_mutex);
443         return rc;
444 }
445 
446 /*
447  * Validation routines.
448  */
449 static void validate_flash(struct rtas_validate_flash_t *args_buf)
450 {
451         int token = rtas_token("ibm,validate-flash-image");
452         int update_results;
453         s32 rc; 
454 
455         rc = 0;
456         do {
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));
464 
465         args_buf->status = rc;
466         args_buf->update_results = update_results;
467 }
468 
469 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, 
470                                    char *msg, int msglen)
471 {
472         int n;
473 
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",
479                                         args_buf->buf);
480         } else {
481                 n = sprintf(msg, "%d\n", args_buf->status);
482         }
483         return n;
484 }
485 
486 static ssize_t validate_flash_read(struct file *file, char __user *buf,
487                                size_t count, loff_t *ppos)
488 {
489         struct rtas_validate_flash_t *const args_buf =
490                 &rtas_validate_flash_data;
491         char msg[VALIDATE_MSG_LEN];
492         int msglen;
493 
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);
497 
498         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
499 }
500 
501 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
502                                     size_t count, loff_t *off)
503 {
504         struct rtas_validate_flash_t *const args_buf =
505                 &rtas_validate_flash_data;
506         int rc;
507 
508         mutex_lock(&rtas_validate_flash_mutex);
509 
510         /* We are only interested in the first 4K of the
511          * candidate image */
512         if ((*off >= VALIDATE_BUF_SIZE) || 
513                 (args_buf->status == VALIDATE_AUTH)) {
514                 *off += count;
515                 mutex_unlock(&rtas_validate_flash_mutex);
516                 return count;
517         }
518 
519         if (*off + count >= VALIDATE_BUF_SIZE)  {
520                 count = VALIDATE_BUF_SIZE - *off;
521                 args_buf->status = VALIDATE_READY;      
522         } else {
523                 args_buf->status = VALIDATE_INCOMPLETE;
524         }
525 
526         if (!access_ok(VERIFY_READ, buf, count)) {
527                 rc = -EFAULT;
528                 goto done;
529         }
530         if (copy_from_user(args_buf->buf + *off, buf, count)) {
531                 rc = -EFAULT;
532                 goto done;
533         }
534 
535         *off += count;
536         rc = count;
537 done:
538         mutex_unlock(&rtas_validate_flash_mutex);
539         return rc;
540 }
541 
542 static int validate_flash_release(struct inode *inode, struct file *file)
543 {
544         struct rtas_validate_flash_t *const args_buf =
545                 &rtas_validate_flash_data;
546 
547         mutex_lock(&rtas_validate_flash_mutex);
548 
549         if (args_buf->status == VALIDATE_READY) {
550                 args_buf->buf_size = VALIDATE_BUF_SIZE;
551                 validate_flash(args_buf);
552         }
553 
554         mutex_unlock(&rtas_validate_flash_mutex);
555         return 0;
556 }
557 
558 /*
559  * On-reboot flash update applicator.
560  */
561 static void rtas_flash_firmware(int reboot_type)
562 {
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;
567 
568         if (rtas_firmware_flash_list == NULL)
569                 return;         /* nothing to do */
570 
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");
574                 return;
575         }
576 
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");
582                 return;
583         }
584 
585         /*
586          * Just before starting the firmware flash, cancel the event scan work
587          * to avoid any soft lockup issues.
588          */
589         rtas_cancel_event_scan();
590 
591         /*
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.
595          */
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);
604                 return;
605         }
606 
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 */
610         image_size = 0;
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 *)cpu_to_be64(__pa(f->blocks[i].data));
615                         image_size += f->blocks[i].length;
616                         f->blocks[i].length = cpu_to_be64(f->blocks[i].length);
617                 }
618                 next = f->next;
619                 /* Don't translate NULL pointer for last entry */
620                 if (f->next)
621                         f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next));
622                 else
623                         f->next = NULL;
624                 /* make num_blocks into the version/length field */
625                 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
626                 f->num_blocks = cpu_to_be64(f->num_blocks);
627         }
628 
629         printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
630         printk(KERN_ALERT "FLASH: performing flash and reboot\n");
631         rtas_progress("Flashing        \n", 0x0);
632         rtas_progress("Please Wait...  ", 0x0);
633         printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
634         status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
635         switch (status) {       /* should only get "bad" status */
636             case 0:
637                 printk(KERN_ALERT "FLASH: success\n");
638                 break;
639             case -1:
640                 printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
641                 break;
642             case -3:
643                 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
644                 break;
645             case -4:
646                 printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
647                 break;
648             default:
649                 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
650                 break;
651         }
652         spin_unlock(&rtas_data_buf_lock);
653 }
654 
655 /*
656  * Manifest of proc files to create
657  */
658 struct rtas_flash_file {
659         const char *filename;
660         const char *rtas_call_name;
661         int *status;
662         const struct file_operations fops;
663 };
664 
665 static const struct rtas_flash_file rtas_flash_files[] = {
666         {
667                 .filename       = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
668                 .rtas_call_name = "ibm,update-flash-64-and-reboot",
669                 .status         = &rtas_update_flash_data.status,
670                 .fops.read      = rtas_flash_read_msg,
671                 .fops.write     = rtas_flash_write,
672                 .fops.release   = rtas_flash_release,
673                 .fops.llseek    = default_llseek,
674         },
675         {
676                 .filename       = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
677                 .rtas_call_name = "ibm,update-flash-64-and-reboot",
678                 .status         = &rtas_update_flash_data.status,
679                 .fops.read      = rtas_flash_read_num,
680                 .fops.write     = rtas_flash_write,
681                 .fops.release   = rtas_flash_release,
682                 .fops.llseek    = default_llseek,
683         },
684         {
685                 .filename       = "powerpc/rtas/" VALIDATE_FLASH_NAME,
686                 .rtas_call_name = "ibm,validate-flash-image",
687                 .status         = &rtas_validate_flash_data.status,
688                 .fops.read      = validate_flash_read,
689                 .fops.write     = validate_flash_write,
690                 .fops.release   = validate_flash_release,
691                 .fops.llseek    = default_llseek,
692         },
693         {
694                 .filename       = "powerpc/rtas/" MANAGE_FLASH_NAME,
695                 .rtas_call_name = "ibm,manage-flash-image",
696                 .status         = &rtas_manage_flash_data.status,
697                 .fops.read      = manage_flash_read,
698                 .fops.write     = manage_flash_write,
699                 .fops.llseek    = default_llseek,
700         }
701 };
702 
703 static int __init rtas_flash_init(void)
704 {
705         int i;
706 
707         if (rtas_token("ibm,update-flash-64-and-reboot") ==
708                        RTAS_UNKNOWN_SERVICE) {
709                 pr_info("rtas_flash: no firmware flash support\n");
710                 return -EINVAL;
711         }
712 
713         rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
714         if (!rtas_validate_flash_data.buf)
715                 return -ENOMEM;
716 
717         flash_block_cache = kmem_cache_create("rtas_flash_cache",
718                                               RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
719                                               NULL);
720         if (!flash_block_cache) {
721                 printk(KERN_ERR "%s: failed to create block cache\n",
722                                 __func__);
723                 goto enomem_buf;
724         }
725 
726         for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
727                 const struct rtas_flash_file *f = &rtas_flash_files[i];
728                 int token;
729 
730                 if (!proc_create(f->filename, S_IRUSR | S_IWUSR, NULL, &f->fops))
731                         goto enomem;
732 
733                 /*
734                  * This code assumes that the status int is the first member of the
735                  * struct
736                  */
737                 token = rtas_token(f->rtas_call_name);
738                 if (token == RTAS_UNKNOWN_SERVICE)
739                         *f->status = FLASH_AUTH;
740                 else
741                         *f->status = FLASH_NO_OP;
742         }
743 
744         rtas_flash_term_hook = rtas_flash_firmware;
745         return 0;
746 
747 enomem:
748         while (--i >= 0) {
749                 const struct rtas_flash_file *f = &rtas_flash_files[i];
750                 remove_proc_entry(f->filename, NULL);
751         }
752 
753         kmem_cache_destroy(flash_block_cache);
754 enomem_buf:
755         kfree(rtas_validate_flash_data.buf);
756         return -ENOMEM;
757 }
758 
759 static void __exit rtas_flash_cleanup(void)
760 {
761         int i;
762 
763         rtas_flash_term_hook = NULL;
764 
765         if (rtas_firmware_flash_list) {
766                 free_flash_list(rtas_firmware_flash_list);
767                 rtas_firmware_flash_list = NULL;
768         }
769 
770         for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
771                 const struct rtas_flash_file *f = &rtas_flash_files[i];
772                 remove_proc_entry(f->filename, NULL);
773         }
774 
775         kmem_cache_destroy(flash_block_cache);
776         kfree(rtas_validate_flash_data.buf);
777 }
778 
779 module_init(rtas_flash_init);
780 module_exit(rtas_flash_cleanup);
781 MODULE_LICENSE("GPL");
782 

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