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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 #include <asm/abs_addr.h>
 25 
 26 #define MODULE_VERS "1.0"
 27 #define MODULE_NAME "rtas_flash"
 28 
 29 #define FIRMWARE_FLASH_NAME "firmware_flash"   
 30 #define FIRMWARE_UPDATE_NAME "firmware_update"
 31 #define MANAGE_FLASH_NAME "manage_flash"
 32 #define VALIDATE_FLASH_NAME "validate_flash"
 33 
 34 /* General RTAS Status Codes */
 35 #define RTAS_RC_SUCCESS  0
 36 #define RTAS_RC_HW_ERR  -1
 37 #define RTAS_RC_BUSY    -2
 38 
 39 /* Flash image status values */
 40 #define FLASH_AUTH           -9002 /* RTAS Not Service Authority Partition */
 41 #define FLASH_NO_OP          -1099 /* No operation initiated by user */ 
 42 #define FLASH_IMG_SHORT      -1005 /* Flash image shorter than expected */
 43 #define FLASH_IMG_BAD_LEN    -1004 /* Bad length value in flash list block */
 44 #define FLASH_IMG_NULL_DATA  -1003 /* Bad data value in flash list block */
 45 #define FLASH_IMG_READY      0     /* Firmware img ready for flash on reboot */
 46 
 47 /* Manage image status values */
 48 #define MANAGE_AUTH          -9002 /* RTAS Not Service Authority Partition */
 49 #define MANAGE_ACTIVE_ERR    -9001 /* RTAS Cannot Overwrite Active Img */
 50 #define MANAGE_NO_OP         -1099 /* No operation initiated by user */
 51 #define MANAGE_PARAM_ERR     -3    /* RTAS Parameter Error */
 52 #define MANAGE_HW_ERR        -1    /* RTAS Hardware Error */
 53 
 54 /* Validate image status values */
 55 #define VALIDATE_AUTH          -9002 /* RTAS Not Service Authority Partition */
 56 #define VALIDATE_NO_OP         -1099 /* No operation initiated by the user */
 57 #define VALIDATE_INCOMPLETE    -1002 /* User copied < VALIDATE_BUF_SIZE */
 58 #define VALIDATE_READY         -1001 /* Firmware image ready for validation */
 59 #define VALIDATE_PARAM_ERR     -3    /* RTAS Parameter Error */
 60 #define VALIDATE_HW_ERR        -1    /* RTAS Hardware Error */
 61 #define VALIDATE_TMP_UPDATE    0     /* Validate Return Status */
 62 #define VALIDATE_FLASH_AUTH    1     /* Validate Return Status */
 63 #define VALIDATE_INVALID_IMG   2     /* Validate Return Status */
 64 #define VALIDATE_CUR_UNKNOWN   3     /* Validate Return Status */
 65 #define VALIDATE_TMP_COMMIT_DL 4     /* Validate Return Status */
 66 #define VALIDATE_TMP_COMMIT    5     /* Validate Return Status */
 67 #define VALIDATE_TMP_UPDATE_DL 6     /* Validate Return Status */
 68 
 69 /* ibm,manage-flash-image operation tokens */
 70 #define RTAS_REJECT_TMP_IMG   0
 71 #define RTAS_COMMIT_TMP_IMG   1
 72 
 73 /* Array sizes */
 74 #define VALIDATE_BUF_SIZE 4096    
 75 #define RTAS_MSG_MAXLEN   64
 76 
 77 /* Quirk - RTAS requires 4k list length and block size */
 78 #define RTAS_BLKLIST_LENGTH 4096
 79 #define RTAS_BLK_SIZE 4096
 80 
 81 struct flash_block {
 82         char *data;
 83         unsigned long length;
 84 };
 85 
 86 /* This struct is very similar but not identical to
 87  * that needed by the rtas flash update.
 88  * All we need to do for rtas is rewrite num_blocks
 89  * into a version/length and translate the pointers
 90  * to absolute.
 91  */
 92 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
 93 struct flash_block_list {
 94         unsigned long num_blocks;
 95         struct flash_block_list *next;
 96         struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
 97 };
 98 
 99 static struct flash_block_list *rtas_firmware_flash_list;
100 
101 /* Use slab cache to guarantee 4k alignment */
102 static struct kmem_cache *flash_block_cache = NULL;
103 
104 #define FLASH_BLOCK_LIST_VERSION (1UL)
105 
106 /* Local copy of the flash block list.
107  * We only allow one open of the flash proc file and create this
108  * list as we go.  The rtas_firmware_flash_list varable will be
109  * set once the data is fully read.
110  *
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 
115  * the flash routine.
116  */
117 
118 /* Status int must be first member of struct */
119 struct rtas_update_flash_t
120 {
121         int status;                     /* Flash update status */
122         struct flash_block_list *flist; /* Local copy of flash block list */
123 };
124 
125 /* Status int must be first member of struct */
126 struct rtas_manage_flash_t
127 {
128         int status;                     /* Returned status */
129         unsigned int op;                /* Reject or commit image */
130 };
131 
132 /* Status int must be first member of struct */
133 struct rtas_validate_flash_t
134 {
135         int status;                     /* Returned status */   
136         char buf[VALIDATE_BUF_SIZE];    /* Candidate image buffer */
137         unsigned int buf_size;          /* Size of image buf */
138         unsigned int update_results;    /* Update results token */
139 };
140 
141 static DEFINE_SPINLOCK(flash_file_open_lock);
142 static struct proc_dir_entry *firmware_flash_pde;
143 static struct proc_dir_entry *firmware_update_pde;
144 static struct proc_dir_entry *validate_pde;
145 static struct proc_dir_entry *manage_pde;
146 
147 /* Do simple sanity checks on the flash image. */
148 static int flash_list_valid(struct flash_block_list *flist)
149 {
150         struct flash_block_list *f;
151         int i;
152         unsigned long block_size, image_size;
153 
154         /* Paranoid self test here.  We also collect the image size. */
155         image_size = 0;
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;
160                         }
161                         block_size = f->blocks[i].length;
162                         if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
163                                 return FLASH_IMG_BAD_LEN;
164                         }
165                         image_size += block_size;
166                 }
167         }
168 
169         if (image_size < (256 << 10)) {
170                 if (image_size < 2) 
171                         return FLASH_NO_OP;
172         }
173 
174         printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
175 
176         return FLASH_IMG_READY;
177 }
178 
179 static void free_flash_list(struct flash_block_list *f)
180 {
181         struct flash_block_list *next;
182         int i;
183 
184         while (f) {
185                 for (i = 0; i < f->num_blocks; i++)
186                         kmem_cache_free(flash_block_cache, f->blocks[i].data);
187                 next = f->next;
188                 kmem_cache_free(flash_block_cache, f);
189                 f = next;
190         }
191 }
192 
193 static int rtas_flash_release(struct inode *inode, struct file *file)
194 {
195         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
196         struct rtas_update_flash_t *uf;
197         
198         uf = (struct rtas_update_flash_t *) dp->data;
199         if (uf->flist) {    
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;
205                 }
206 
207                 if (uf->status != FLASH_AUTH)  
208                         uf->status = flash_list_valid(uf->flist);
209 
210                 if (uf->status == FLASH_IMG_READY) 
211                         rtas_firmware_flash_list = uf->flist;
212                 else
213                         free_flash_list(uf->flist);
214 
215                 uf->flist = NULL;
216         }
217 
218         atomic_dec(&dp->count);
219         return 0;
220 }
221 
222 static void get_flash_status_msg(int status, char *buf)
223 {
224         char *msg;
225 
226         switch (status) {
227         case FLASH_AUTH:
228                 msg = "error: this partition does not have service authority\n";
229                 break;
230         case FLASH_NO_OP:
231                 msg = "info: no firmware image for flash\n";
232                 break;
233         case FLASH_IMG_SHORT:
234                 msg = "error: flash image short\n";
235                 break;
236         case FLASH_IMG_BAD_LEN:
237                 msg = "error: internal error bad length\n";
238                 break;
239         case FLASH_IMG_NULL_DATA:
240                 msg = "error: internal error null data\n";
241                 break;
242         case FLASH_IMG_READY:
243                 msg = "ready: firmware image ready for flash on reboot\n";
244                 break;
245         default:
246                 sprintf(buf, "error: unexpected status value %d\n", status);
247                 return;
248         }
249 
250         strcpy(buf, msg);       
251 }
252 
253 /* Reading the proc file will show status (not the firmware contents) */
254 static ssize_t rtas_flash_read(struct file *file, char __user *buf,
255                                size_t count, loff_t *ppos)
256 {
257         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
258         struct rtas_update_flash_t *uf;
259         char msg[RTAS_MSG_MAXLEN];
260 
261         uf = dp->data;
262 
263         if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) {
264                 get_flash_status_msg(uf->status, msg);
265         } else {           /* FIRMWARE_UPDATE_NAME */
266                 sprintf(msg, "%d\n", uf->status);
267         }
268 
269         return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
270 }
271 
272 /* constructor for flash_block_cache */
273 void rtas_block_ctor(void *ptr)
274 {
275         memset(ptr, 0, RTAS_BLK_SIZE);
276 }
277 
278 /* We could be much more efficient here.  But to keep this function
279  * simple we allocate a page to the block list no matter how small the
280  * count is.  If the system is low on memory it will be just as well
281  * that we fail....
282  */
283 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
284                                 size_t count, loff_t *off)
285 {
286         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
287         struct rtas_update_flash_t *uf;
288         char *p;
289         int next_free;
290         struct flash_block_list *fl;
291 
292         uf = (struct rtas_update_flash_t *) dp->data;
293 
294         if (uf->status == FLASH_AUTH || count == 0)
295                 return count;   /* discard data */
296 
297         /* In the case that the image is not ready for flashing, the memory
298          * allocated for the block list will be freed upon the release of the 
299          * proc file
300          */
301         if (uf->flist == NULL) {
302                 uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
303                 if (!uf->flist)
304                         return -ENOMEM;
305         }
306 
307         fl = uf->flist;
308         while (fl->next)
309                 fl = fl->next; /* seek to last block_list for append */
310         next_free = fl->num_blocks;
311         if (next_free == FLASH_BLOCKS_PER_NODE) {
312                 /* Need to allocate another block_list */
313                 fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
314                 if (!fl->next)
315                         return -ENOMEM;
316                 fl = fl->next;
317                 next_free = 0;
318         }
319 
320         if (count > RTAS_BLK_SIZE)
321                 count = RTAS_BLK_SIZE;
322         p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
323         if (!p)
324                 return -ENOMEM;
325         
326         if(copy_from_user(p, buffer, count)) {
327                 kmem_cache_free(flash_block_cache, p);
328                 return -EFAULT;
329         }
330         fl->blocks[next_free].data = p;
331         fl->blocks[next_free].length = count;
332         fl->num_blocks++;
333 
334         return count;
335 }
336 
337 static int rtas_excl_open(struct inode *inode, struct file *file)
338 {
339         struct proc_dir_entry *dp = PDE(inode);
340 
341         /* Enforce exclusive open with use count of PDE */
342         spin_lock(&flash_file_open_lock);
343         if (atomic_read(&dp->count) > 2) {
344                 spin_unlock(&flash_file_open_lock);
345                 return -EBUSY;
346         }
347 
348         atomic_inc(&dp->count);
349         spin_unlock(&flash_file_open_lock);
350         
351         return 0;
352 }
353 
354 static int rtas_excl_release(struct inode *inode, struct file *file)
355 {
356         struct proc_dir_entry *dp = PDE(inode);
357 
358         atomic_dec(&dp->count);
359 
360         return 0;
361 }
362 
363 static void manage_flash(struct rtas_manage_flash_t *args_buf)
364 {
365         s32 rc;
366 
367         do {
368                 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 
369                                1, NULL, args_buf->op);
370         } while (rtas_busy_delay(rc));
371 
372         args_buf->status = rc;
373 }
374 
375 static ssize_t manage_flash_read(struct file *file, char __user *buf,
376                                size_t count, loff_t *ppos)
377 {
378         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
379         struct rtas_manage_flash_t *args_buf;
380         char msg[RTAS_MSG_MAXLEN];
381         int msglen;
382 
383         args_buf = dp->data;
384         if (args_buf == NULL)
385                 return 0;
386 
387         msglen = sprintf(msg, "%d\n", args_buf->status);
388 
389         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
390 }
391 
392 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
393                                 size_t count, loff_t *off)
394 {
395         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
396         struct rtas_manage_flash_t *args_buf;
397         const char reject_str[] = "";
398         const char commit_str[] = "1";
399         char stkbuf[10];
400         int op;
401 
402         args_buf = (struct rtas_manage_flash_t *) dp->data;
403         if ((args_buf->status == MANAGE_AUTH) || (count == 0))
404                 return count;
405                 
406         op = -1;
407         if (buf) {
408                 if (count > 9) count = 9;
409                 if (copy_from_user (stkbuf, buf, count)) {
410                         return -EFAULT;
411                 }
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;
416         }
417         
418         if (op == -1)   /* buf is empty, or contains invalid string */
419                 return -EINVAL;
420 
421         args_buf->op = op;
422         manage_flash(args_buf);
423 
424         return count;
425 }
426 
427 static void validate_flash(struct rtas_validate_flash_t *args_buf)
428 {
429         int token = rtas_token("ibm,validate-flash-image");
430         int update_results;
431         s32 rc; 
432 
433         rc = 0;
434         do {
435                 spin_lock(&rtas_data_buf_lock);
436                 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
437                 rc = rtas_call(token, 2, 2, &update_results, 
438                                (u32) __pa(rtas_data_buf), args_buf->buf_size);
439                 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
440                 spin_unlock(&rtas_data_buf_lock);
441         } while (rtas_busy_delay(rc));
442 
443         args_buf->status = rc;
444         args_buf->update_results = update_results;
445 }
446 
447 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, 
448                                    char *msg)
449 {
450         int n;
451 
452         if (args_buf->status >= VALIDATE_TMP_UPDATE) { 
453                 n = sprintf(msg, "%d\n", args_buf->update_results);
454                 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
455                     (args_buf->update_results == VALIDATE_TMP_UPDATE))
456                         n += sprintf(msg + n, "%s\n", args_buf->buf);
457         } else {
458                 n = sprintf(msg, "%d\n", args_buf->status);
459         }
460         return n;
461 }
462 
463 static ssize_t validate_flash_read(struct file *file, char __user *buf,
464                                size_t count, loff_t *ppos)
465 {
466         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
467         struct rtas_validate_flash_t *args_buf;
468         char msg[RTAS_MSG_MAXLEN];
469         int msglen;
470 
471         args_buf = dp->data;
472 
473         msglen = get_validate_flash_msg(args_buf, msg);
474 
475         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
476 }
477 
478 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
479                                     size_t count, loff_t *off)
480 {
481         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
482         struct rtas_validate_flash_t *args_buf;
483         int rc;
484 
485         args_buf = (struct rtas_validate_flash_t *) dp->data;
486 
487         if (dp->data == NULL) {
488                 dp->data = kmalloc(sizeof(struct rtas_validate_flash_t), 
489                                 GFP_KERNEL);
490                 if (dp->data == NULL) 
491                         return -ENOMEM;
492         }
493 
494         /* We are only interested in the first 4K of the
495          * candidate image */
496         if ((*off >= VALIDATE_BUF_SIZE) || 
497                 (args_buf->status == VALIDATE_AUTH)) {
498                 *off += count;
499                 return count;
500         }
501 
502         if (*off + count >= VALIDATE_BUF_SIZE)  {
503                 count = VALIDATE_BUF_SIZE - *off;
504                 args_buf->status = VALIDATE_READY;      
505         } else {
506                 args_buf->status = VALIDATE_INCOMPLETE;
507         }
508 
509         if (!access_ok(VERIFY_READ, buf, count)) {
510                 rc = -EFAULT;
511                 goto done;
512         }
513         if (copy_from_user(args_buf->buf + *off, buf, count)) {
514                 rc = -EFAULT;
515                 goto done;
516         }
517 
518         *off += count;
519         rc = count;
520 done:
521         if (rc < 0) {
522                 kfree(dp->data);
523                 dp->data = NULL;
524         }
525         return rc;
526 }
527 
528 static int validate_flash_release(struct inode *inode, struct file *file)
529 {
530         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
531         struct rtas_validate_flash_t *args_buf;
532 
533         args_buf = (struct rtas_validate_flash_t *) dp->data;
534 
535         if (args_buf->status == VALIDATE_READY) {
536                 args_buf->buf_size = VALIDATE_BUF_SIZE;
537                 validate_flash(args_buf);
538         }
539 
540         /* The matching atomic_inc was in rtas_excl_open() */
541         atomic_dec(&dp->count);
542 
543         return 0;
544 }
545 
546 static void rtas_flash_firmware(int reboot_type)
547 {
548         unsigned long image_size;
549         struct flash_block_list *f, *next, *flist;
550         unsigned long rtas_block_list;
551         int i, status, update_token;
552 
553         if (rtas_firmware_flash_list == NULL)
554                 return;         /* nothing to do */
555 
556         if (reboot_type != SYS_RESTART) {
557                 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
558                 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
559                 return;
560         }
561 
562         update_token = rtas_token("ibm,update-flash-64-and-reboot");
563         if (update_token == RTAS_UNKNOWN_SERVICE) {
564                 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
565                        "is not available -- not a service partition?\n");
566                 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
567                 return;
568         }
569 
570         /*
571          * Just before starting the firmware flash, cancel the event scan work
572          * to avoid any soft lockup issues.
573          */
574         rtas_cancel_event_scan();
575 
576         /*
577          * NOTE: the "first" block must be under 4GB, so we create
578          * an entry with no data blocks in the reserved buffer in
579          * the kernel data segment.
580          */
581         spin_lock(&rtas_data_buf_lock);
582         flist = (struct flash_block_list *)&rtas_data_buf[0];
583         flist->num_blocks = 0;
584         flist->next = rtas_firmware_flash_list;
585         rtas_block_list = virt_to_abs(flist);
586         if (rtas_block_list >= 4UL*1024*1024*1024) {
587                 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
588                 spin_unlock(&rtas_data_buf_lock);
589                 return;
590         }
591 
592         printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
593         /* Update the block_list in place. */
594         rtas_firmware_flash_list = NULL; /* too hard to backout on error */
595         image_size = 0;
596         for (f = flist; f; f = next) {
597                 /* Translate data addrs to absolute */
598                 for (i = 0; i < f->num_blocks; i++) {
599                         f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
600                         image_size += f->blocks[i].length;
601                 }
602                 next = f->next;
603                 /* Don't translate NULL pointer for last entry */
604                 if (f->next)
605                         f->next = (struct flash_block_list *)virt_to_abs(f->next);
606                 else
607                         f->next = NULL;
608                 /* make num_blocks into the version/length field */
609                 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
610         }
611 
612         printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
613         printk(KERN_ALERT "FLASH: performing flash and reboot\n");
614         rtas_progress("Flashing        \n", 0x0);
615         rtas_progress("Please Wait...  ", 0x0);
616         printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
617         status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
618         switch (status) {       /* should only get "bad" status */
619             case 0:
620                 printk(KERN_ALERT "FLASH: success\n");
621                 break;
622             case -1:
623                 printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
624                 break;
625             case -3:
626                 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
627                 break;
628             case -4:
629                 printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
630                 break;
631             default:
632                 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
633                 break;
634         }
635         spin_unlock(&rtas_data_buf_lock);
636 }
637 
638 static void remove_flash_pde(struct proc_dir_entry *dp)
639 {
640         if (dp) {
641                 kfree(dp->data);
642                 remove_proc_entry(dp->name, dp->parent);
643         }
644 }
645 
646 static int initialize_flash_pde_data(const char *rtas_call_name,
647                                      size_t buf_size,
648                                      struct proc_dir_entry *dp)
649 {
650         int *status;
651         int token;
652 
653         dp->data = kzalloc(buf_size, GFP_KERNEL);
654         if (dp->data == NULL) {
655                 remove_flash_pde(dp);
656                 return -ENOMEM;
657         }
658 
659         /*
660          * This code assumes that the status int is the first member of the
661          * struct 
662          */
663         status = (int *) dp->data;
664         token = rtas_token(rtas_call_name);
665         if (token == RTAS_UNKNOWN_SERVICE)
666                 *status = FLASH_AUTH;
667         else
668                 *status = FLASH_NO_OP;
669 
670         return 0;
671 }
672 
673 static struct proc_dir_entry *create_flash_pde(const char *filename,
674                                                const struct file_operations *fops)
675 {
676         return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops);
677 }
678 
679 static const struct file_operations rtas_flash_operations = {
680         .owner          = THIS_MODULE,
681         .read           = rtas_flash_read,
682         .write          = rtas_flash_write,
683         .open           = rtas_excl_open,
684         .release        = rtas_flash_release,
685         .llseek         = default_llseek,
686 };
687 
688 static const struct file_operations manage_flash_operations = {
689         .owner          = THIS_MODULE,
690         .read           = manage_flash_read,
691         .write          = manage_flash_write,
692         .open           = rtas_excl_open,
693         .release        = rtas_excl_release,
694         .llseek         = default_llseek,
695 };
696 
697 static const struct file_operations validate_flash_operations = {
698         .owner          = THIS_MODULE,
699         .read           = validate_flash_read,
700         .write          = validate_flash_write,
701         .open           = rtas_excl_open,
702         .release        = validate_flash_release,
703         .llseek         = default_llseek,
704 };
705 
706 static int __init rtas_flash_init(void)
707 {
708         int rc;
709 
710         if (rtas_token("ibm,update-flash-64-and-reboot") ==
711                        RTAS_UNKNOWN_SERVICE) {
712                 pr_info("rtas_flash: no firmware flash support\n");
713                 return 1;
714         }
715 
716         firmware_flash_pde = create_flash_pde("powerpc/rtas/"
717                                               FIRMWARE_FLASH_NAME,
718                                               &rtas_flash_operations);
719         if (firmware_flash_pde == NULL) {
720                 rc = -ENOMEM;
721                 goto cleanup;
722         }
723 
724         rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
725                                        sizeof(struct rtas_update_flash_t), 
726                                        firmware_flash_pde);
727         if (rc != 0)
728                 goto cleanup;
729 
730         firmware_update_pde = create_flash_pde("powerpc/rtas/"
731                                                FIRMWARE_UPDATE_NAME,
732                                                &rtas_flash_operations);
733         if (firmware_update_pde == NULL) {
734                 rc = -ENOMEM;
735                 goto cleanup;
736         }
737 
738         rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
739                                        sizeof(struct rtas_update_flash_t), 
740                                        firmware_update_pde);
741         if (rc != 0)
742                 goto cleanup;
743 
744         validate_pde = create_flash_pde("powerpc/rtas/" VALIDATE_FLASH_NAME,
745                                         &validate_flash_operations);
746         if (validate_pde == NULL) {
747                 rc = -ENOMEM;
748                 goto cleanup;
749         }
750 
751         rc = initialize_flash_pde_data("ibm,validate-flash-image",
752                                        sizeof(struct rtas_validate_flash_t), 
753                                        validate_pde);
754         if (rc != 0)
755                 goto cleanup;
756 
757         manage_pde = create_flash_pde("powerpc/rtas/" MANAGE_FLASH_NAME,
758                                       &manage_flash_operations);
759         if (manage_pde == NULL) {
760                 rc = -ENOMEM;
761                 goto cleanup;
762         }
763 
764         rc = initialize_flash_pde_data("ibm,manage-flash-image",
765                                        sizeof(struct rtas_manage_flash_t),
766                                        manage_pde);
767         if (rc != 0)
768                 goto cleanup;
769 
770         rtas_flash_term_hook = rtas_flash_firmware;
771 
772         flash_block_cache = kmem_cache_create("rtas_flash_cache",
773                                 RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
774                                 rtas_block_ctor);
775         if (!flash_block_cache) {
776                 printk(KERN_ERR "%s: failed to create block cache\n",
777                                 __func__);
778                 rc = -ENOMEM;
779                 goto cleanup;
780         }
781         return 0;
782 
783 cleanup:
784         remove_flash_pde(firmware_flash_pde);
785         remove_flash_pde(firmware_update_pde);
786         remove_flash_pde(validate_pde);
787         remove_flash_pde(manage_pde);
788 
789         return rc;
790 }
791 
792 static void __exit rtas_flash_cleanup(void)
793 {
794         rtas_flash_term_hook = NULL;
795 
796         if (flash_block_cache)
797                 kmem_cache_destroy(flash_block_cache);
798 
799         remove_flash_pde(firmware_flash_pde);
800         remove_flash_pde(firmware_update_pde);
801         remove_flash_pde(validate_pde);
802         remove_flash_pde(manage_pde);
803 }
804 
805 module_init(rtas_flash_init);
806 module_exit(rtas_flash_cleanup);
807 MODULE_LICENSE("GPL");
808 

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