arch/powerpc/kernel/rtas_flash.c

   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/ppc64/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/proc_fs.h>
  19 #include <asm/delay.h>
  20 #include <asm/uaccess.h>
  21 #include <asm/rtas.h>
  22 #include <asm/abs_addr.h>
  23
  24 #define MODULE_VERS "1.0"
  25 #define MODULE_NAME "rtas_flash"
  26
  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"
  31
  32 /* General RTAS Status Codes */
  33 #define RTAS_RC_SUCCESS  0
  34 #define RTAS_RC_HW_ERR  -1
  35 #define RTAS_RC_BUSY    -2
  36
  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 */
  44
  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 */
  51
  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 */
  66
  67 /* ibm,manage-flash-image operation tokens */
  68 #define RTAS_REJECT_TMP_IMG   0
  69 #define RTAS_COMMIT_TMP_IMG   1
  70
  71 /* Array sizes */
  72 #define VALIDATE_BUF_SIZE 4096
  73 #define RTAS_MSG_MAXLEN   64
  74
  75 /* Quirk - RTAS requires 4k list length and block size */
  76 #define RTAS_BLKLIST_LENGTH 4096
  77 #define RTAS_BLK_SIZE 4096
  78
  79 struct flash_block {
  80         char *data;
  81         unsigned long length;
  82 };
  83
  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
  88  * to absolute.
  89  */
  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];
  95 };
  96 struct flash_block_list_header { /* just the header of flash_block_list */
  97         unsigned long num_blocks;
  98         struct flash_block_list *next;
  99 };
 100
 101 static struct flash_block_list_header rtas_firmware_flash_list = {0, NULL};
 102
 103 /* Use slab cache to guarantee 4k alignment */
 104 static struct kmem_cache *flash_block_cache = NULL;
 105
 106 #define FLASH_BLOCK_LIST_VERSION (1UL)
 107
 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.
 112  *
 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.
 117  */
 118
 119 /* Status int must be first member of struct */
 120 struct rtas_update_flash_t
 121 {
 122         int status;                     /* Flash update status */
 123         struct flash_block_list *flist; /* Local copy of flash block list */
 124 };
 125
 126 /* Status int must be first member of struct */
 127 struct rtas_manage_flash_t
 128 {
 129         int status;                     /* Returned status */
 130         unsigned int op;                /* Reject or commit image */
 131 };
 132
 133 /* Status int must be first member of struct */
 134 struct rtas_validate_flash_t
 135 {
 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 */
 140 };
 141
 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;
 147
 148 /* Do simple sanity checks on the flash image. */
 149 static int flash_list_valid(struct flash_block_list *flist)
 150 {
 151         struct flash_block_list *f;
 152         int i;
 153         unsigned long block_size, image_size;
 154
 155         /* Paranoid self test here.  We also collect the image size. */
 156         image_size = 0;
 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;
 161                         }
 162                         block_size = f->blocks[i].length;
 163                         if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
 164                                 return FLASH_IMG_BAD_LEN;
 165                         }
 166                         image_size += block_size;
 167                 }
 168         }
 169
 170         if (image_size < (256 << 10)) {
 171                 if (image_size < 2)
 172                         return FLASH_NO_OP;
 173         }
 174
 175         printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
 176
 177         return FLASH_IMG_READY;
 178 }
 179
 180 static void free_flash_list(struct flash_block_list *f)
 181 {
 182         struct flash_block_list *next;
 183         int i;
 184
 185         while (f) {
 186                 for (i = 0; i < f->num_blocks; i++)
 187                         kmem_cache_free(flash_block_cache, f->blocks[i].data);
 188                 next = f->next;
 189                 kmem_cache_free(flash_block_cache, f);
 190                 f = next;
 191         }
 192 }
 193
 194 static int rtas_flash_release(struct inode *inode, struct file *file)
 195 {
 196         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 197         struct rtas_update_flash_t *uf;
 198
 199         uf = (struct rtas_update_flash_t *) dp->data;
 200         if (uf->flist) {
 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;
 206                 }
 207
 208                 if (uf->status != FLASH_AUTH)
 209                         uf->status = flash_list_valid(uf->flist);
 210
 211                 if (uf->status == FLASH_IMG_READY)
 212                         rtas_firmware_flash_list.next = uf->flist;
 213                 else
 214                         free_flash_list(uf->flist);
 215
 216                 uf->flist = NULL;
 217         }
 218
 219         atomic_dec(&dp->count);
 220         return 0;
 221 }
 222
 223 static void get_flash_status_msg(int status, char *buf)
 224 {
 225         char *msg;
 226
 227         switch (status) {
 228         case FLASH_AUTH:
 229                 msg = "error: this partition does not have service authority\n";
 230                 break;
 231         case FLASH_NO_OP:
 232                 msg = "info: no firmware image for flash\n";
 233                 break;
 234         case FLASH_IMG_SHORT:
 235                 msg = "error: flash image short\n";
 236                 break;
 237         case FLASH_IMG_BAD_LEN:
 238                 msg = "error: internal error bad length\n";
 239                 break;
 240         case FLASH_IMG_NULL_DATA:
 241                 msg = "error: internal error null data\n";
 242                 break;
 243         case FLASH_IMG_READY:
 244                 msg = "ready: firmware image ready for flash on reboot\n";
 245                 break;
 246         default:
 247                 sprintf(buf, "error: unexpected status value %d\n", status);
 248                 return;
 249         }
 250
 251         strcpy(buf, msg);
 252 }
 253
 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)
 257 {
 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];
 261         int msglen;
 262
 263         uf = (struct rtas_update_flash_t *) dp->data;
 264
 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);
 269         }
 270         msglen = strlen(msg);
 271         if (msglen > count)
 272                 msglen = count;
 273
 274         if (ppos && *ppos != 0)
 275                 return 0;       /* be cheap */
 276
 277         if (!access_ok(VERIFY_WRITE, buf, msglen))
 278                 return -EINVAL;
 279
 280         if (copy_to_user(buf, msg, msglen))
 281                 return -EFAULT;
 282
 283         if (ppos)
 284                 *ppos = msglen;
 285         return msglen;
 286 }
 287
 288 /* constructor for flash_block_cache */
 289 void rtas_block_ctor(struct kmem_cache *cache, void *ptr)
 290 {
 291         memset(ptr, 0, RTAS_BLK_SIZE);
 292 }
 293
 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
 297  * that we fail....
 298  */
 299 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
 300                                 size_t count, loff_t *off)
 301 {
 302         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 303         struct rtas_update_flash_t *uf;
 304         char *p;
 305         int next_free;
 306         struct flash_block_list *fl;
 307
 308         uf = (struct rtas_update_flash_t *) dp->data;
 309
 310         if (uf->status == FLASH_AUTH || count == 0)
 311                 return count;   /* discard data */
 312
 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
 315          * proc file
 316          */
 317         if (uf->flist == NULL) {
 318                 uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
 319                 if (!uf->flist)
 320                         return -ENOMEM;
 321         }
 322
 323         fl = uf->flist;
 324         while (fl->next)
 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);
 330                 if (!fl->next)
 331                         return -ENOMEM;
 332                 fl = fl->next;
 333                 next_free = 0;
 334         }
 335
 336         if (count > RTAS_BLK_SIZE)
 337                 count = RTAS_BLK_SIZE;
 338         p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
 339         if (!p)
 340                 return -ENOMEM;
 341
 342         if(copy_from_user(p, buffer, count)) {
 343                 kmem_cache_free(flash_block_cache, p);
 344                 return -EFAULT;
 345         }
 346         fl->blocks[next_free].data = p;
 347         fl->blocks[next_free].length = count;
 348         fl->num_blocks++;
 349
 350         return count;
 351 }
 352
 353 static int rtas_excl_open(struct inode *inode, struct file *file)
 354 {
 355         struct proc_dir_entry *dp = PDE(inode);
 356
 357         /* Enforce exclusive open with use count of PDE */
 358         spin_lock(&flash_file_open_lock);
 359         if (atomic_read(&dp->count) > 2) {
 360                 spin_unlock(&flash_file_open_lock);
 361                 return -EBUSY;
 362         }
 363
 364         atomic_inc(&dp->count);
 365         spin_unlock(&flash_file_open_lock);
 366
 367         return 0;
 368 }
 369
 370 static int rtas_excl_release(struct inode *inode, struct file *file)
 371 {
 372         struct proc_dir_entry *dp = PDE(inode);
 373
 374         atomic_dec(&dp->count);
 375
 376         return 0;
 377 }
 378
 379 static void manage_flash(struct rtas_manage_flash_t *args_buf)
 380 {
 381         s32 rc;
 382
 383         do {
 384                 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1,
 385                                1, NULL, args_buf->op);
 386         } while (rtas_busy_delay(rc));
 387
 388         args_buf->status = rc;
 389 }
 390
 391 static ssize_t manage_flash_read(struct file *file, char __user *buf,
 392                                size_t count, loff_t *ppos)
 393 {
 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];
 397         int msglen;
 398
 399         args_buf = (struct rtas_manage_flash_t *) dp->data;
 400         if (args_buf == NULL)
 401                 return 0;
 402
 403         msglen = sprintf(msg, "%d\n", args_buf->status);
 404         if (msglen > count)
 405                 msglen = count;
 406
 407         if (ppos && *ppos != 0)
 408                 return 0;       /* be cheap */
 409
 410         if (!access_ok(VERIFY_WRITE, buf, msglen))
 411                 return -EINVAL;
 412
 413         if (copy_to_user(buf, msg, msglen))
 414                 return -EFAULT;
 415
 416         if (ppos)
 417                 *ppos = msglen;
 418         return msglen;
 419 }
 420
 421 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
 422                                 size_t count, loff_t *off)
 423 {
 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";
 428         char stkbuf[10];
 429         int op;
 430
 431         args_buf = (struct rtas_manage_flash_t *) dp->data;
 432         if ((args_buf->status == MANAGE_AUTH) || (count == 0))
 433                 return count;
 434
 435         op = -1;
 436         if (buf) {
 437                 if (count > 9) count = 9;
 438                 if (copy_from_user (stkbuf, buf, count)) {
 439                         return -EFAULT;
 440                 }
 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;
 445         }
 446
 447         if (op == -1)   /* buf is empty, or contains invalid string */
 448                 return -EINVAL;
 449
 450         args_buf->op = op;
 451         manage_flash(args_buf);
 452
 453         return count;
 454 }
 455
 456 static void validate_flash(struct rtas_validate_flash_t *args_buf)
 457 {
 458         int token = rtas_token("ibm,validate-flash-image");
 459         int update_results;
 460         s32 rc;
 461
 462         rc = 0;
 463         do {
 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));
 471
 472         args_buf->status = rc;
 473         args_buf->update_results = update_results;
 474 }
 475
 476 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
 477                                    char *msg)
 478 {
 479         int n;
 480
 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);
 486         } else {
 487                 n = sprintf(msg, "%d\n", args_buf->status);
 488         }
 489         return n;
 490 }
 491
 492 static ssize_t validate_flash_read(struct file *file, char __user *buf,
 493                                size_t count, loff_t *ppos)
 494 {
 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];
 498         int msglen;
 499
 500         args_buf = (struct rtas_validate_flash_t *) dp->data;
 501
 502         if (ppos && *ppos != 0)
 503                 return 0;       /* be cheap */
 504
 505         msglen = get_validate_flash_msg(args_buf, msg);
 506         if (msglen > count)
 507                 msglen = count;
 508
 509         if (!access_ok(VERIFY_WRITE, buf, msglen))
 510                 return -EINVAL;
 511
 512         if (copy_to_user(buf, msg, msglen))
 513                 return -EFAULT;
 514
 515         if (ppos)
 516                 *ppos = msglen;
 517         return msglen;
 518 }
 519
 520 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
 521                                     size_t count, loff_t *off)
 522 {
 523         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 524         struct rtas_validate_flash_t *args_buf;
 525         int rc;
 526
 527         args_buf = (struct rtas_validate_flash_t *) dp->data;
 528
 529         if (dp->data == NULL) {
 530                 dp->data = kmalloc(sizeof(struct rtas_validate_flash_t),
 531                                 GFP_KERNEL);
 532                 if (dp->data == NULL)
 533                         return -ENOMEM;
 534         }
 535
 536         /* We are only interested in the first 4K of the
 537          * candidate image */
 538         if ((*off >= VALIDATE_BUF_SIZE) ||
 539                 (args_buf->status == VALIDATE_AUTH)) {
 540                 *off += count;
 541                 return count;
 542         }
 543
 544         if (*off + count >= VALIDATE_BUF_SIZE)  {
 545                 count = VALIDATE_BUF_SIZE - *off;
 546                 args_buf->status = VALIDATE_READY;
 547         } else {
 548                 args_buf->status = VALIDATE_INCOMPLETE;
 549         }
 550
 551         if (!access_ok(VERIFY_READ, buf, count)) {
 552                 rc = -EFAULT;
 553                 goto done;
 554         }
 555         if (copy_from_user(args_buf->buf + *off, buf, count)) {
 556                 rc = -EFAULT;
 557                 goto done;
 558         }
 559
 560         *off += count;
 561         rc = count;
 562 done:
 563         if (rc < 0) {
 564                 kfree(dp->data);
 565                 dp->data = NULL;
 566         }
 567         return rc;
 568 }
 569
 570 static int validate_flash_release(struct inode *inode, struct file *file)
 571 {
 572         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 573         struct rtas_validate_flash_t *args_buf;
 574
 575         args_buf = (struct rtas_validate_flash_t *) dp->data;
 576
 577         if (args_buf->status == VALIDATE_READY) {
 578                 args_buf->buf_size = VALIDATE_BUF_SIZE;
 579                 validate_flash(args_buf);
 580         }
 581
 582         /* The matching atomic_inc was in rtas_excl_open() */
 583         atomic_dec(&dp->count);
 584
 585         return 0;
 586 }
 587
 588 static void rtas_flash_firmware(int reboot_type)
 589 {
 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;
 594
 595         if (rtas_firmware_flash_list.next == NULL)
 596                 return;         /* nothing to do */
 597
 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");
 601                 return;
 602         }
 603
 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");
 609                 return;
 610         }
 611
 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.
 615          */
 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");
 621                 return;
 622         }
 623
 624         printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
 625         /* Update the block_list in place. */
 626         image_size = 0;
 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;
 632                 }
 633                 next = f->next;
 634                 /* Don't translate NULL pointer for last entry */
 635                 if (f->next)
 636                         f->next = (struct flash_block_list *)virt_to_abs(f->next);
 637                 else
 638                         f->next = NULL;
 639                 /* make num_blocks into the version/length field */
 640                 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
 641         }
 642
 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 */
 650             case 0:
 651                 printk(KERN_ALERT "FLASH: success\n");
 652                 break;
 653             case -1:
 654                 printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
 655                 break;
 656             case -3:
 657                 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
 658                 break;
 659             case -4:
 660                 printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
 661                 break;
 662             default:
 663                 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
 664                 break;
 665         }
 666 }
 667
 668 static void remove_flash_pde(struct proc_dir_entry *dp)
 669 {
 670         if (dp) {
 671                 kfree(dp->data);
 672                 dp->owner = NULL;
 673                 remove_proc_entry(dp->name, dp->parent);
 674         }
 675 }
 676
 677 static int initialize_flash_pde_data(const char *rtas_call_name,
 678                                      size_t buf_size,
 679                                      struct proc_dir_entry *dp)
 680 {
 681         int *status;
 682         int token;
 683
 684         dp->data = kzalloc(buf_size, GFP_KERNEL);
 685         if (dp->data == NULL) {
 686                 remove_flash_pde(dp);
 687                 return -ENOMEM;
 688         }
 689
 690         /*
 691          * This code assumes that the status int is the first member of the
 692          * struct
 693          */
 694         status = (int *) dp->data;
 695         token = rtas_token(rtas_call_name);
 696         if (token == RTAS_UNKNOWN_SERVICE)
 697                 *status = FLASH_AUTH;
 698         else
 699                 *status = FLASH_NO_OP;
 700
 701         return 0;
 702 }
 703
 704 static struct proc_dir_entry *create_flash_pde(const char *filename,
 705                                                const struct file_operations *fops)
 706 {
 707         return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops);
 708 }
 709
 710 static const struct file_operations rtas_flash_operations = {
 711         .owner          = THIS_MODULE,
 712         .read           = rtas_flash_read,
 713         .write          = rtas_flash_write,
 714         .open           = rtas_excl_open,
 715         .release        = rtas_flash_release,
 716 };
 717
 718 static const struct file_operations manage_flash_operations = {
 719         .owner          = THIS_MODULE,
 720         .read           = manage_flash_read,
 721         .write          = manage_flash_write,
 722         .open           = rtas_excl_open,
 723         .release        = rtas_excl_release,
 724 };
 725
 726 static const struct file_operations validate_flash_operations = {
 727         .owner          = THIS_MODULE,
 728         .read           = validate_flash_read,
 729         .write          = validate_flash_write,
 730         .open           = rtas_excl_open,
 731         .release        = validate_flash_release,
 732 };
 733
 734 int __init rtas_flash_init(void)
 735 {
 736         int rc;
 737
 738         if (rtas_token("ibm,update-flash-64-and-reboot") ==
 739                        RTAS_UNKNOWN_SERVICE) {
 740                 printk(KERN_ERR "rtas_flash: no firmware flash support\n");
 741                 return 1;
 742         }
 743
 744         firmware_flash_pde = create_flash_pde("ppc64/rtas/"
 745                                               FIRMWARE_FLASH_NAME,
 746                                               &rtas_flash_operations);
 747         if (firmware_flash_pde == NULL) {
 748                 rc = -ENOMEM;
 749                 goto cleanup;
 750         }
 751
 752         rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
 753                                        sizeof(struct rtas_update_flash_t),
 754                                        firmware_flash_pde);
 755         if (rc != 0)
 756                 goto cleanup;
 757
 758         firmware_update_pde = create_flash_pde("ppc64/rtas/"
 759                                                FIRMWARE_UPDATE_NAME,
 760                                                &rtas_flash_operations);
 761         if (firmware_update_pde == NULL) {
 762                 rc = -ENOMEM;
 763                 goto cleanup;
 764         }
 765
 766         rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
 767                                        sizeof(struct rtas_update_flash_t),
 768                                        firmware_update_pde);
 769         if (rc != 0)
 770                 goto cleanup;
 771
 772         validate_pde = create_flash_pde("ppc64/rtas/" VALIDATE_FLASH_NAME,
 773                                         &validate_flash_operations);
 774         if (validate_pde == NULL) {
 775                 rc = -ENOMEM;
 776                 goto cleanup;
 777         }
 778
 779         rc = initialize_flash_pde_data("ibm,validate-flash-image",
 780                                        sizeof(struct rtas_validate_flash_t),
 781                                        validate_pde);
 782         if (rc != 0)
 783                 goto cleanup;
 784
 785         manage_pde = create_flash_pde("ppc64/rtas/" MANAGE_FLASH_NAME,
 786                                       &manage_flash_operations);
 787         if (manage_pde == NULL) {
 788                 rc = -ENOMEM;
 789                 goto cleanup;
 790         }
 791
 792         rc = initialize_flash_pde_data("ibm,manage-flash-image",
 793                                        sizeof(struct rtas_manage_flash_t),
 794                                        manage_pde);
 795         if (rc != 0)
 796                 goto cleanup;
 797
 798         rtas_flash_term_hook = rtas_flash_firmware;
 799
 800         flash_block_cache = kmem_cache_create("rtas_flash_cache",
 801                                 RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
 802                                 rtas_block_ctor);
 803         if (!flash_block_cache) {
 804                 printk(KERN_ERR "%s: failed to create block cache\n",
 805                                 __func__);
 806                 rc = -ENOMEM;
 807                 goto cleanup;
 808         }
 809         return 0;
 810
 811 cleanup:
 812         remove_flash_pde(firmware_flash_pde);
 813         remove_flash_pde(firmware_update_pde);
 814         remove_flash_pde(validate_pde);
 815         remove_flash_pde(manage_pde);
 816
 817         return rc;
 818 }
 819
 820 void __exit rtas_flash_cleanup(void)
 821 {
 822         rtas_flash_term_hook = NULL;
 823
 824         if (flash_block_cache)
 825                 kmem_cache_destroy(flash_block_cache);
 826
 827         remove_flash_pde(firmware_flash_pde);
 828         remove_flash_pde(firmware_update_pde);
 829         remove_flash_pde(validate_pde);
 830         remove_flash_pde(manage_pde);
 831 }
 832
 833 module_init(rtas_flash_init);
 834 module_exit(rtas_flash_cleanup);
 835 MODULE_LICENSE("GPL");