arch/powerpc/kernel/rtas_flash.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  c 2001 PPC 64 Team, IBM Corp
   4  *
   5  * /proc/powerpc/rtas/firmware_flash interface
   6  *
   7  * This file implements a firmware_flash interface to pump a firmware
   8  * image into the kernel.  At reboot time rtas_restart() will see the
   9  * firmware image and flash it as it reboots (see rtas.c).
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/reboot.h>
  17 #include <asm/delay.h>
  18 #include <linux/uaccess.h>
  19 #include <asm/rtas.h>
  20
  21 #define MODULE_VERS "1.0"
  22 #define MODULE_NAME "rtas_flash"
  23
  24 #define FIRMWARE_FLASH_NAME "firmware_flash"
  25 #define FIRMWARE_UPDATE_NAME "firmware_update"
  26 #define MANAGE_FLASH_NAME "manage_flash"
  27 #define VALIDATE_FLASH_NAME "validate_flash"
  28
  29 /* General RTAS Status Codes */
  30 #define RTAS_RC_SUCCESS  0
  31 #define RTAS_RC_HW_ERR  -1
  32 #define RTAS_RC_BUSY    -2
  33
  34 /* Flash image status values */
  35 #define FLASH_AUTH           -9002 /* RTAS Not Service Authority Partition */
  36 #define FLASH_NO_OP          -1099 /* No operation initiated by user */
  37 #define FLASH_IMG_SHORT      -1005 /* Flash image shorter than expected */
  38 #define FLASH_IMG_BAD_LEN    -1004 /* Bad length value in flash list block */
  39 #define FLASH_IMG_NULL_DATA  -1003 /* Bad data value in flash list block */
  40 #define FLASH_IMG_READY      0     /* Firmware img ready for flash on reboot */
  41
  42 /* Manage image status values */
  43 #define MANAGE_AUTH          -9002 /* RTAS Not Service Authority Partition */
  44 #define MANAGE_ACTIVE_ERR    -9001 /* RTAS Cannot Overwrite Active Img */
  45 #define MANAGE_NO_OP         -1099 /* No operation initiated by user */
  46 #define MANAGE_PARAM_ERR     -3    /* RTAS Parameter Error */
  47 #define MANAGE_HW_ERR        -1    /* RTAS Hardware Error */
  48
  49 /* Validate image status values */
  50 #define VALIDATE_AUTH          -9002 /* RTAS Not Service Authority Partition */
  51 #define VALIDATE_NO_OP         -1099 /* No operation initiated by the user */
  52 #define VALIDATE_INCOMPLETE    -1002 /* User copied < VALIDATE_BUF_SIZE */
  53 #define VALIDATE_READY         -1001 /* Firmware image ready for validation */
  54 #define VALIDATE_PARAM_ERR     -3    /* RTAS Parameter Error */
  55 #define VALIDATE_HW_ERR        -1    /* RTAS Hardware Error */
  56
  57 /* ibm,validate-flash-image update result tokens */
  58 #define VALIDATE_TMP_UPDATE    0     /* T side will be updated */
  59 #define VALIDATE_FLASH_AUTH    1     /* Partition does not have authority */
  60 #define VALIDATE_INVALID_IMG   2     /* Candidate image is not valid */
  61 #define VALIDATE_CUR_UNKNOWN   3     /* Current fixpack level is unknown */
  62 /*
  63  * Current T side will be committed to P side before being replace with new
  64  * image, and the new image is downlevel from current image
  65  */
  66 #define VALIDATE_TMP_COMMIT_DL 4
  67 /*
  68  * Current T side will be committed to P side before being replaced with new
  69  * image
  70  */
  71 #define VALIDATE_TMP_COMMIT    5
  72 /*
  73  * T side will be updated with a downlevel image
  74  */
  75 #define VALIDATE_TMP_UPDATE_DL 6
  76 /*
  77  * The candidate image's release date is later than the system's firmware
  78  * service entitlement date - service warranty period has expired
  79  */
  80 #define VALIDATE_OUT_OF_WRNTY  7
  81
  82 /* ibm,manage-flash-image operation tokens */
  83 #define RTAS_REJECT_TMP_IMG   0
  84 #define RTAS_COMMIT_TMP_IMG   1
  85
  86 /* Array sizes */
  87 #define VALIDATE_BUF_SIZE 4096
  88 #define VALIDATE_MSG_LEN  256
  89 #define RTAS_MSG_MAXLEN   64
  90
  91 /* Quirk - RTAS requires 4k list length and block size */
  92 #define RTAS_BLKLIST_LENGTH 4096
  93 #define RTAS_BLK_SIZE 4096
  94
  95 struct flash_block {
  96         char *data;
  97         unsigned long length;
  98 };
  99
 100 /* This struct is very similar but not identical to
 101  * that needed by the rtas flash update.
 102  * All we need to do for rtas is rewrite num_blocks
 103  * into a version/length and translate the pointers
 104  * to absolute.
 105  */
 106 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
 107 struct flash_block_list {
 108         unsigned long num_blocks;
 109         struct flash_block_list *next;
 110         struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
 111 };
 112
 113 static struct flash_block_list *rtas_firmware_flash_list;
 114
 115 /* Use slab cache to guarantee 4k alignment */
 116 static struct kmem_cache *flash_block_cache = NULL;
 117
 118 #define FLASH_BLOCK_LIST_VERSION (1UL)
 119
 120 /*
 121  * Local copy of the flash block list.
 122  *
 123  * The rtas_firmware_flash_list varable will be
 124  * set once the data is fully read.
 125  *
 126  * For convenience as we build the list we use virtual addrs,
 127  * we do not fill in the version number, and the length field
 128  * is treated as the number of entries currently in the block
 129  * (i.e. not a byte count).  This is all fixed when calling
 130  * the flash routine.
 131  */
 132
 133 /* Status int must be first member of struct */
 134 struct rtas_update_flash_t
 135 {
 136         int status;                     /* Flash update status */
 137         struct flash_block_list *flist; /* Local copy of flash block list */
 138 };
 139
 140 /* Status int must be first member of struct */
 141 struct rtas_manage_flash_t
 142 {
 143         int status;                     /* Returned status */
 144 };
 145
 146 /* Status int must be first member of struct */
 147 struct rtas_validate_flash_t
 148 {
 149         int status;                     /* Returned status */
 150         char *buf;                      /* Candidate image buffer */
 151         unsigned int buf_size;          /* Size of image buf */
 152         unsigned int update_results;    /* Update results token */
 153 };
 154
 155 static struct rtas_update_flash_t rtas_update_flash_data;
 156 static struct rtas_manage_flash_t rtas_manage_flash_data;
 157 static struct rtas_validate_flash_t rtas_validate_flash_data;
 158 static DEFINE_MUTEX(rtas_update_flash_mutex);
 159 static DEFINE_MUTEX(rtas_manage_flash_mutex);
 160 static DEFINE_MUTEX(rtas_validate_flash_mutex);
 161
 162 /* Do simple sanity checks on the flash image. */
 163 static int flash_list_valid(struct flash_block_list *flist)
 164 {
 165         struct flash_block_list *f;
 166         int i;
 167         unsigned long block_size, image_size;
 168
 169         /* Paranoid self test here.  We also collect the image size. */
 170         image_size = 0;
 171         for (f = flist; f; f = f->next) {
 172                 for (i = 0; i < f->num_blocks; i++) {
 173                         if (f->blocks[i].data == NULL) {
 174                                 return FLASH_IMG_NULL_DATA;
 175                         }
 176                         block_size = f->blocks[i].length;
 177                         if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
 178                                 return FLASH_IMG_BAD_LEN;
 179                         }
 180                         image_size += block_size;
 181                 }
 182         }
 183
 184         if (image_size < (256 << 10)) {
 185                 if (image_size < 2)
 186                         return FLASH_NO_OP;
 187         }
 188
 189         printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
 190
 191         return FLASH_IMG_READY;
 192 }
 193
 194 static void free_flash_list(struct flash_block_list *f)
 195 {
 196         struct flash_block_list *next;
 197         int i;
 198
 199         while (f) {
 200                 for (i = 0; i < f->num_blocks; i++)
 201                         kmem_cache_free(flash_block_cache, f->blocks[i].data);
 202                 next = f->next;
 203                 kmem_cache_free(flash_block_cache, f);
 204                 f = next;
 205         }
 206 }
 207
 208 static int rtas_flash_release(struct inode *inode, struct file *file)
 209 {
 210         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
 211
 212         mutex_lock(&rtas_update_flash_mutex);
 213
 214         if (uf->flist) {
 215                 /* File was opened in write mode for a new flash attempt */
 216                 /* Clear saved list */
 217                 if (rtas_firmware_flash_list) {
 218                         free_flash_list(rtas_firmware_flash_list);
 219                         rtas_firmware_flash_list = NULL;
 220                 }
 221
 222                 if (uf->status != FLASH_AUTH)
 223                         uf->status = flash_list_valid(uf->flist);
 224
 225                 if (uf->status == FLASH_IMG_READY)
 226                         rtas_firmware_flash_list = uf->flist;
 227                 else
 228                         free_flash_list(uf->flist);
 229
 230                 uf->flist = NULL;
 231         }
 232
 233         mutex_unlock(&rtas_update_flash_mutex);
 234         return 0;
 235 }
 236
 237 static size_t get_flash_status_msg(int status, char *buf)
 238 {
 239         const char *msg;
 240         size_t len;
 241
 242         switch (status) {
 243         case FLASH_AUTH:
 244                 msg = "error: this partition does not have service authority\n";
 245                 break;
 246         case FLASH_NO_OP:
 247                 msg = "info: no firmware image for flash\n";
 248                 break;
 249         case FLASH_IMG_SHORT:
 250                 msg = "error: flash image short\n";
 251                 break;
 252         case FLASH_IMG_BAD_LEN:
 253                 msg = "error: internal error bad length\n";
 254                 break;
 255         case FLASH_IMG_NULL_DATA:
 256                 msg = "error: internal error null data\n";
 257                 break;
 258         case FLASH_IMG_READY:
 259                 msg = "ready: firmware image ready for flash on reboot\n";
 260                 break;
 261         default:
 262                 return sprintf(buf, "error: unexpected status value %d\n",
 263                                status);
 264         }
 265
 266         len = strlen(msg);
 267         memcpy(buf, msg, len + 1);
 268         return len;
 269 }
 270
 271 /* Reading the proc file will show status (not the firmware contents) */
 272 static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf,
 273                                    size_t count, loff_t *ppos)
 274 {
 275         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
 276         char msg[RTAS_MSG_MAXLEN];
 277         size_t len;
 278         int status;
 279
 280         mutex_lock(&rtas_update_flash_mutex);
 281         status = uf->status;
 282         mutex_unlock(&rtas_update_flash_mutex);
 283
 284         /* Read as text message */
 285         len = get_flash_status_msg(status, msg);
 286         return simple_read_from_buffer(buf, count, ppos, msg, len);
 287 }
 288
 289 static ssize_t rtas_flash_read_num(struct file *file, char __user *buf,
 290                                    size_t count, loff_t *ppos)
 291 {
 292         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
 293         char msg[RTAS_MSG_MAXLEN];
 294         int status;
 295
 296         mutex_lock(&rtas_update_flash_mutex);
 297         status = uf->status;
 298         mutex_unlock(&rtas_update_flash_mutex);
 299
 300         /* Read as number */
 301         sprintf(msg, "%d\n", status);
 302         return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
 303 }
 304
 305 /* We could be much more efficient here.  But to keep this function
 306  * simple we allocate a page to the block list no matter how small the
 307  * count is.  If the system is low on memory it will be just as well
 308  * that we fail....
 309  */
 310 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
 311                                 size_t count, loff_t *off)
 312 {
 313         struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
 314         char *p;
 315         int next_free, rc;
 316         struct flash_block_list *fl;
 317
 318         mutex_lock(&rtas_update_flash_mutex);
 319
 320         if (uf->status == FLASH_AUTH || count == 0)
 321                 goto out;       /* discard data */
 322
 323         /* In the case that the image is not ready for flashing, the memory
 324          * allocated for the block list will be freed upon the release of the
 325          * proc file
 326          */
 327         if (uf->flist == NULL) {
 328                 uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
 329                 if (!uf->flist)
 330                         goto nomem;
 331         }
 332
 333         fl = uf->flist;
 334         while (fl->next)
 335                 fl = fl->next; /* seek to last block_list for append */
 336         next_free = fl->num_blocks;
 337         if (next_free == FLASH_BLOCKS_PER_NODE) {
 338                 /* Need to allocate another block_list */
 339                 fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
 340                 if (!fl->next)
 341                         goto nomem;
 342                 fl = fl->next;
 343                 next_free = 0;
 344         }
 345
 346         if (count > RTAS_BLK_SIZE)
 347                 count = RTAS_BLK_SIZE;
 348         p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
 349         if (!p)
 350                 goto nomem;
 351
 352         if(copy_from_user(p, buffer, count)) {
 353                 kmem_cache_free(flash_block_cache, p);
 354                 rc = -EFAULT;
 355                 goto error;
 356         }
 357         fl->blocks[next_free].data = p;
 358         fl->blocks[next_free].length = count;
 359         fl->num_blocks++;
 360 out:
 361         mutex_unlock(&rtas_update_flash_mutex);
 362         return count;
 363
 364 nomem:
 365         rc = -ENOMEM;
 366 error:
 367         mutex_unlock(&rtas_update_flash_mutex);
 368         return rc;
 369 }
 370
 371 /*
 372  * Flash management routines.
 373  */
 374 static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
 375 {
 376         s32 rc;
 377
 378         do {
 379                 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1,
 380                                NULL, op);
 381         } while (rtas_busy_delay(rc));
 382
 383         args_buf->status = rc;
 384 }
 385
 386 static ssize_t manage_flash_read(struct file *file, char __user *buf,
 387                                size_t count, loff_t *ppos)
 388 {
 389         struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
 390         char msg[RTAS_MSG_MAXLEN];
 391         int msglen, status;
 392
 393         mutex_lock(&rtas_manage_flash_mutex);
 394         status = args_buf->status;
 395         mutex_unlock(&rtas_manage_flash_mutex);
 396
 397         msglen = sprintf(msg, "%d\n", status);
 398         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
 399 }
 400
 401 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
 402                                 size_t count, loff_t *off)
 403 {
 404         struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
 405         static const char reject_str[] = "0";
 406         static const char commit_str[] = "1";
 407         char stkbuf[10];
 408         int op, rc;
 409
 410         mutex_lock(&rtas_manage_flash_mutex);
 411
 412         if ((args_buf->status == MANAGE_AUTH) || (count == 0))
 413                 goto out;
 414
 415         op = -1;
 416         if (buf) {
 417                 if (count > 9) count = 9;
 418                 rc = -EFAULT;
 419                 if (copy_from_user (stkbuf, buf, count))
 420                         goto error;
 421                 if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0)
 422                         op = RTAS_REJECT_TMP_IMG;
 423                 else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0)
 424                         op = RTAS_COMMIT_TMP_IMG;
 425         }
 426
 427         if (op == -1) {   /* buf is empty, or contains invalid string */
 428                 rc = -EINVAL;
 429                 goto error;
 430         }
 431
 432         manage_flash(args_buf, op);
 433 out:
 434         mutex_unlock(&rtas_manage_flash_mutex);
 435         return count;
 436
 437 error:
 438         mutex_unlock(&rtas_manage_flash_mutex);
 439         return rc;
 440 }
 441
 442 /*
 443  * Validation routines.
 444  */
 445 static void validate_flash(struct rtas_validate_flash_t *args_buf)
 446 {
 447         int token = rtas_token("ibm,validate-flash-image");
 448         int update_results;
 449         s32 rc;
 450
 451         rc = 0;
 452         do {
 453                 spin_lock(&rtas_data_buf_lock);
 454                 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
 455                 rc = rtas_call(token, 2, 2, &update_results,
 456                                (u32) __pa(rtas_data_buf), args_buf->buf_size);
 457                 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
 458                 spin_unlock(&rtas_data_buf_lock);
 459         } while (rtas_busy_delay(rc));
 460
 461         args_buf->status = rc;
 462         args_buf->update_results = update_results;
 463 }
 464
 465 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
 466                                    char *msg, int msglen)
 467 {
 468         int n;
 469
 470         if (args_buf->status >= VALIDATE_TMP_UPDATE) {
 471                 n = sprintf(msg, "%d\n", args_buf->update_results);
 472                 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
 473                     (args_buf->update_results == VALIDATE_TMP_UPDATE))
 474                         n += snprintf(msg + n, msglen - n, "%s\n",
 475                                         args_buf->buf);
 476         } else {
 477                 n = sprintf(msg, "%d\n", args_buf->status);
 478         }
 479         return n;
 480 }
 481
 482 static ssize_t validate_flash_read(struct file *file, char __user *buf,
 483                                size_t count, loff_t *ppos)
 484 {
 485         struct rtas_validate_flash_t *const args_buf =
 486                 &rtas_validate_flash_data;
 487         char msg[VALIDATE_MSG_LEN];
 488         int msglen;
 489
 490         mutex_lock(&rtas_validate_flash_mutex);
 491         msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN);
 492         mutex_unlock(&rtas_validate_flash_mutex);
 493
 494         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
 495 }
 496
 497 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
 498                                     size_t count, loff_t *off)
 499 {
 500         struct rtas_validate_flash_t *const args_buf =
 501                 &rtas_validate_flash_data;
 502         int rc;
 503
 504         mutex_lock(&rtas_validate_flash_mutex);
 505
 506         /* We are only interested in the first 4K of the
 507          * candidate image */
 508         if ((*off >= VALIDATE_BUF_SIZE) ||
 509                 (args_buf->status == VALIDATE_AUTH)) {
 510                 *off += count;
 511                 mutex_unlock(&rtas_validate_flash_mutex);
 512                 return count;
 513         }
 514
 515         if (*off + count >= VALIDATE_BUF_SIZE)  {
 516                 count = VALIDATE_BUF_SIZE - *off;
 517                 args_buf->status = VALIDATE_READY;
 518         } else {
 519                 args_buf->status = VALIDATE_INCOMPLETE;
 520         }
 521
 522         if (!access_ok(buf, count)) {
 523                 rc = -EFAULT;
 524                 goto done;
 525         }
 526         if (copy_from_user(args_buf->buf + *off, buf, count)) {
 527                 rc = -EFAULT;
 528                 goto done;
 529         }
 530
 531         *off += count;
 532         rc = count;
 533 done:
 534         mutex_unlock(&rtas_validate_flash_mutex);
 535         return rc;
 536 }
 537
 538 static int validate_flash_release(struct inode *inode, struct file *file)
 539 {
 540         struct rtas_validate_flash_t *const args_buf =
 541                 &rtas_validate_flash_data;
 542
 543         mutex_lock(&rtas_validate_flash_mutex);
 544
 545         if (args_buf->status == VALIDATE_READY) {
 546                 args_buf->buf_size = VALIDATE_BUF_SIZE;
 547                 validate_flash(args_buf);
 548         }
 549
 550         mutex_unlock(&rtas_validate_flash_mutex);
 551         return 0;
 552 }
 553
 554 /*
 555  * On-reboot flash update applicator.
 556  */
 557 static void rtas_flash_firmware(int reboot_type)
 558 {
 559         unsigned long image_size;
 560         struct flash_block_list *f, *next, *flist;
 561         unsigned long rtas_block_list;
 562         int i, status, update_token;
 563
 564         if (rtas_firmware_flash_list == NULL)
 565                 return;         /* nothing to do */
 566
 567         if (reboot_type != SYS_RESTART) {
 568                 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
 569                 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
 570                 return;
 571         }
 572
 573         update_token = rtas_token("ibm,update-flash-64-and-reboot");
 574         if (update_token == RTAS_UNKNOWN_SERVICE) {
 575                 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
 576                        "is not available -- not a service partition?\n");
 577                 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
 578                 return;
 579         }
 580
 581         /*
 582          * Just before starting the firmware flash, cancel the event scan work
 583          * to avoid any soft lockup issues.
 584          */
 585         rtas_cancel_event_scan();
 586
 587         /*
 588          * NOTE: the "first" block must be under 4GB, so we create
 589          * an entry with no data blocks in the reserved buffer in
 590          * the kernel data segment.
 591          */
 592         spin_lock(&rtas_data_buf_lock);
 593         flist = (struct flash_block_list *)&rtas_data_buf[0];
 594         flist->num_blocks = 0;
 595         flist->next = rtas_firmware_flash_list;
 596         rtas_block_list = __pa(flist);
 597         if (rtas_block_list >= 4UL*1024*1024*1024) {
 598                 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
 599                 spin_unlock(&rtas_data_buf_lock);
 600                 return;
 601         }
 602
 603         printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
 604         /* Update the block_list in place. */
 605         rtas_firmware_flash_list = NULL; /* too hard to backout on error */
 606         image_size = 0;
 607         for (f = flist; f; f = next) {
 608                 /* Translate data addrs to absolute */
 609                 for (i = 0; i < f->num_blocks; i++) {
 610                         f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data));
 611                         image_size += f->blocks[i].length;
 612                         f->blocks[i].length = cpu_to_be64(f->blocks[i].length);
 613                 }
 614                 next = f->next;
 615                 /* Don't translate NULL pointer for last entry */
 616                 if (f->next)
 617                         f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next));
 618                 else
 619                         f->next = NULL;
 620                 /* make num_blocks into the version/length field */
 621                 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
 622                 f->num_blocks = cpu_to_be64(f->num_blocks);
 623         }
 624
 625         printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
 626         printk(KERN_ALERT "FLASH: performing flash and reboot\n");
 627         rtas_progress("Flashing        \n", 0x0);
 628         rtas_progress("Please Wait...  ", 0x0);
 629         printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
 630         status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
 631         switch (status) {       /* should only get "bad" status */
 632             case 0:
 633                 printk(KERN_ALERT "FLASH: success\n");
 634                 break;
 635             case -1:
 636                 printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
 637                 break;
 638             case -3:
 639                 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
 640                 break;
 641             case -4:
 642                 printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
 643                 break;
 644             default:
 645                 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
 646                 break;
 647         }
 648         spin_unlock(&rtas_data_buf_lock);
 649 }
 650
 651 /*
 652  * Manifest of proc files to create
 653  */
 654 struct rtas_flash_file {
 655         const char *filename;
 656         const char *rtas_call_name;
 657         int *status;
 658         const struct proc_ops ops;
 659 };
 660
 661 static const struct rtas_flash_file rtas_flash_files[] = {
 662         {
 663                 .filename       = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
 664                 .rtas_call_name = "ibm,update-flash-64-and-reboot",
 665                 .status         = &rtas_update_flash_data.status,
 666                 .ops.proc_read  = rtas_flash_read_msg,
 667                 .ops.proc_write = rtas_flash_write,
 668                 .ops.proc_release = rtas_flash_release,
 669                 .ops.proc_lseek = default_llseek,
 670         },
 671         {
 672                 .filename       = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
 673                 .rtas_call_name = "ibm,update-flash-64-and-reboot",
 674                 .status         = &rtas_update_flash_data.status,
 675                 .ops.proc_read  = rtas_flash_read_num,
 676                 .ops.proc_write = rtas_flash_write,
 677                 .ops.proc_release = rtas_flash_release,
 678                 .ops.proc_lseek = default_llseek,
 679         },
 680         {
 681                 .filename       = "powerpc/rtas/" VALIDATE_FLASH_NAME,
 682                 .rtas_call_name = "ibm,validate-flash-image",
 683                 .status         = &rtas_validate_flash_data.status,
 684                 .ops.proc_read  = validate_flash_read,
 685                 .ops.proc_write = validate_flash_write,
 686                 .ops.proc_release = validate_flash_release,
 687                 .ops.proc_lseek = default_llseek,
 688         },
 689         {
 690                 .filename       = "powerpc/rtas/" MANAGE_FLASH_NAME,
 691                 .rtas_call_name = "ibm,manage-flash-image",
 692                 .status         = &rtas_manage_flash_data.status,
 693                 .ops.proc_read  = manage_flash_read,
 694                 .ops.proc_write = manage_flash_write,
 695                 .ops.proc_lseek = default_llseek,
 696         }
 697 };
 698
 699 static int __init rtas_flash_init(void)
 700 {
 701         int i;
 702
 703         if (rtas_token("ibm,update-flash-64-and-reboot") ==
 704                        RTAS_UNKNOWN_SERVICE) {
 705                 pr_info("rtas_flash: no firmware flash support\n");
 706                 return -EINVAL;
 707         }
 708
 709         rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
 710         if (!rtas_validate_flash_data.buf)
 711                 return -ENOMEM;
 712
 713         flash_block_cache = kmem_cache_create("rtas_flash_cache",
 714                                               RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
 715                                               NULL);
 716         if (!flash_block_cache) {
 717                 printk(KERN_ERR "%s: failed to create block cache\n",
 718                                 __func__);
 719                 goto enomem_buf;
 720         }
 721
 722         for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
 723                 const struct rtas_flash_file *f = &rtas_flash_files[i];
 724                 int token;
 725
 726                 if (!proc_create(f->filename, 0600, NULL, &f->ops))
 727                         goto enomem;
 728
 729                 /*
 730                  * This code assumes that the status int is the first member of the
 731                  * struct
 732                  */
 733                 token = rtas_token(f->rtas_call_name);
 734                 if (token == RTAS_UNKNOWN_SERVICE)
 735                         *f->status = FLASH_AUTH;
 736                 else
 737                         *f->status = FLASH_NO_OP;
 738         }
 739
 740         rtas_flash_term_hook = rtas_flash_firmware;
 741         return 0;
 742
 743 enomem:
 744         while (--i >= 0) {
 745                 const struct rtas_flash_file *f = &rtas_flash_files[i];
 746                 remove_proc_entry(f->filename, NULL);
 747         }
 748
 749         kmem_cache_destroy(flash_block_cache);
 750 enomem_buf:
 751         kfree(rtas_validate_flash_data.buf);
 752         return -ENOMEM;
 753 }
 754
 755 static void __exit rtas_flash_cleanup(void)
 756 {
 757         int i;
 758
 759         rtas_flash_term_hook = NULL;
 760
 761         if (rtas_firmware_flash_list) {
 762                 free_flash_list(rtas_firmware_flash_list);
 763                 rtas_firmware_flash_list = NULL;
 764         }
 765
 766         for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
 767                 const struct rtas_flash_file *f = &rtas_flash_files[i];
 768                 remove_proc_entry(f->filename, NULL);
 769         }
 770
 771         kmem_cache_destroy(flash_block_cache);
 772         kfree(rtas_validate_flash_data.buf);
 773 }
 774
 775 module_init(rtas_flash_init);
 776 module_exit(rtas_flash_cleanup);
 777 MODULE_LICENSE("GPL");