drivers/cdrom/viocd.c

   1 /* -*- linux-c -*-
   2  *  drivers/cdrom/viocd.c
   3  *
   4  *  iSeries Virtual CD Rom
   5  *
   6  *  Authors: Dave Boutcher <boutcher@us.ibm.com>
   7  *           Ryan Arnold <ryanarn@us.ibm.com>
   8  *           Colin Devilbiss <devilbis@us.ibm.com>
   9  *           Stephen Rothwell <sfr@au1.ibm.com>
  10  *
  11  * (C) Copyright 2000-2004 IBM Corporation
  12  *
  13  * This program is free software;  you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation; either version 2 of the
  16  * License, or (at your option) anyu later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * This routine provides access to CD ROM drives owned and managed by an
  28  * OS/400 partition running on the same box as this Linux partition.
  29  *
  30  * All operations are performed by sending messages back and forth to
  31  * the OS/400 partition.
  32  */
  33
  34 #include <linux/major.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/cdrom.h>
  37 #include <linux/errno.h>
  38 #include <linux/init.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/module.h>
  41 #include <linux/completion.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/seq_file.h>
  44
  45 #include <asm/bug.h>
  46
  47 #include <asm/scatterlist.h>
  48 #include <asm/iSeries/HvTypes.h>
  49 #include <asm/iSeries/HvLpEvent.h>
  50 #include <asm/iSeries/vio.h>
  51
  52 #define VIOCD_DEVICE                    "iseries/vcd"
  53 #define VIOCD_DEVICE_DEVFS              "iseries/vcd"
  54
  55 #define VIOCD_VERS "1.06"
  56
  57 #define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
  58 #define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
  59
  60 struct viocdlpevent {
  61         struct HvLpEvent        event;
  62         u32                     reserved;
  63         u16                     version;
  64         u16                     sub_result;
  65         u16                     disk;
  66         u16                     flags;
  67         u32                     token;
  68         u64                     offset;         /* On open, max number of disks */
  69         u64                     len;            /* On open, size of the disk */
  70         u32                     block_size;     /* Only set on open */
  71         u32                     media_size;     /* Only set on open */
  72 };
  73
  74 enum viocdsubtype {
  75         viocdopen = 0x0001,
  76         viocdclose = 0x0002,
  77         viocdread = 0x0003,
  78         viocdwrite = 0x0004,
  79         viocdlockdoor = 0x0005,
  80         viocdgetinfo = 0x0006,
  81         viocdcheck = 0x0007
  82 };
  83
  84 /*
  85  * Should probably make this a module parameter....sigh
  86  */
  87 #define VIOCD_MAX_CD 8
  88
  89 static const struct vio_error_entry viocd_err_table[] = {
  90         {0x0201, EINVAL, "Invalid Range"},
  91         {0x0202, EINVAL, "Invalid Token"},
  92         {0x0203, EIO, "DMA Error"},
  93         {0x0204, EIO, "Use Error"},
  94         {0x0205, EIO, "Release Error"},
  95         {0x0206, EINVAL, "Invalid CD"},
  96         {0x020C, EROFS, "Read Only Device"},
  97         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  98         {0x020E, EIO, "Optical System Error (Varied Off?)"},
  99         {0x02FF, EIO, "Internal Error"},
 100         {0x3010, EIO, "Changed Volume"},
 101         {0xC100, EIO, "Optical System Error"},
 102         {0x0000, 0, NULL},
 103 };
 104
 105 /*
 106  * This is the structure we use to exchange info between driver and interrupt
 107  * handler
 108  */
 109 struct viocd_waitevent {
 110         struct completion       com;
 111         int                     rc;
 112         u16                     sub_result;
 113         int                     changed;
 114 };
 115
 116 /* this is a lookup table for the true capabilities of a device */
 117 struct capability_entry {
 118         char    *type;
 119         int     capability;
 120 };
 121
 122 static struct capability_entry capability_table[] __initdata = {
 123         { "6330", CDC_LOCK | CDC_DVD_RAM },
 124         { "6321", CDC_LOCK },
 125         { "632B", 0 },
 126         { NULL  , CDC_LOCK },
 127 };
 128
 129 /* These are our internal structures for keeping track of devices */
 130 static int viocd_numdev;
 131
 132 struct cdrom_info {
 133         char    rsrcname[10];
 134         char    type[4];
 135         char    model[3];
 136 };
 137 /*
 138  * This needs to be allocated since it is passed to the
 139  * Hypervisor and we may be a module.
 140  */
 141 static struct cdrom_info *viocd_unitinfo;
 142 static dma_addr_t unitinfo_dmaaddr;
 143
 144 struct disk_info {
 145         struct gendisk                  *viocd_disk;
 146         struct cdrom_device_info        viocd_info;
 147 };
 148 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 149
 150 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 151
 152 static request_queue_t *viocd_queue;
 153 static spinlock_t viocd_reqlock;
 154
 155 #define MAX_CD_REQ      1
 156
 157 /* procfs support */
 158 static int proc_viocd_show(struct seq_file *m, void *v)
 159 {
 160         int i;
 161
 162         for (i = 0; i < viocd_numdev; i++) {
 163                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 164                                 "type %4.4s, model %3.3s\n",
 165                                 i, viocd_unitinfo[i].rsrcname,
 166                                 viocd_unitinfo[i].type,
 167                                 viocd_unitinfo[i].model);
 168         }
 169         return 0;
 170 }
 171
 172 static int proc_viocd_open(struct inode *inode, struct file *file)
 173 {
 174         return single_open(file, proc_viocd_show, NULL);
 175 }
 176
 177 static struct file_operations proc_viocd_operations = {
 178         .open           = proc_viocd_open,
 179         .read           = seq_read,
 180         .llseek         = seq_lseek,
 181         .release        = single_release,
 182 };
 183
 184 static int viocd_blk_open(struct inode *inode, struct file *file)
 185 {
 186         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 187         return cdrom_open(&di->viocd_info, inode, file);
 188 }
 189
 190 static int viocd_blk_release(struct inode *inode, struct file *file)
 191 {
 192         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 193         return cdrom_release(&di->viocd_info, file);
 194 }
 195
 196 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 197                 unsigned cmd, unsigned long arg)
 198 {
 199         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 200         return cdrom_ioctl(&di->viocd_info, inode, cmd, arg);
 201 }
 202
 203 static int viocd_blk_media_changed(struct gendisk *disk)
 204 {
 205         struct disk_info *di = disk->private_data;
 206         return cdrom_media_changed(&di->viocd_info);
 207 }
 208
 209 struct block_device_operations viocd_fops = {
 210         .owner =                THIS_MODULE,
 211         .open =                 viocd_blk_open,
 212         .release =              viocd_blk_release,
 213         .ioctl =                viocd_blk_ioctl,
 214         .media_changed =        viocd_blk_media_changed,
 215 };
 216
 217 /* Get info on CD devices from OS/400 */
 218 static void __init get_viocd_info(void)
 219 {
 220         HvLpEvent_Rc hvrc;
 221         int i;
 222         struct viocd_waitevent we;
 223
 224         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
 225                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 226                         &unitinfo_dmaaddr, GFP_ATOMIC);
 227         if (viocd_unitinfo == NULL) {
 228                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
 229                 return;
 230         }
 231
 232         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
 233
 234         init_completion(&we.com);
 235
 236         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 237                         HvLpEvent_Type_VirtualIo,
 238                         viomajorsubtype_cdio | viocdgetinfo,
 239                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 240                         viopath_sourceinst(viopath_hostLp),
 241                         viopath_targetinst(viopath_hostLp),
 242                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
 243                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
 244         if (hvrc != HvLpEvent_Rc_Good) {
 245                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
 246                                 (int)hvrc);
 247                 goto error_ret;
 248         }
 249
 250         wait_for_completion(&we.com);
 251
 252         if (we.rc) {
 253                 const struct vio_error_entry *err =
 254                         vio_lookup_rc(viocd_err_table, we.sub_result);
 255                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
 256                                 we.rc, we.sub_result, err->msg);
 257                 goto error_ret;
 258         }
 259
 260         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
 261                 viocd_numdev++;
 262
 263         return;
 264
 265 error_ret:
 266         dma_free_coherent(iSeries_vio_dev,
 267                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 268                         viocd_unitinfo, unitinfo_dmaaddr);
 269         viocd_unitinfo = NULL;
 270 }
 271
 272 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 273 {
 274         struct disk_info *diskinfo = cdi->handle;
 275         int device_no = DEVICE_NR(diskinfo);
 276         HvLpEvent_Rc hvrc;
 277         struct viocd_waitevent we;
 278
 279         init_completion(&we.com);
 280         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 281                         HvLpEvent_Type_VirtualIo,
 282                         viomajorsubtype_cdio | viocdopen,
 283                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 284                         viopath_sourceinst(viopath_hostLp),
 285                         viopath_targetinst(viopath_hostLp),
 286                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 287                         0, 0, 0);
 288         if (hvrc != 0) {
 289                 printk(VIOCD_KERN_WARNING
 290                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 291                                 (int)hvrc);
 292                 return -EIO;
 293         }
 294
 295         wait_for_completion(&we.com);
 296
 297         if (we.rc) {
 298                 const struct vio_error_entry *err =
 299                         vio_lookup_rc(viocd_err_table, we.sub_result);
 300                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 301                                 we.rc, we.sub_result, err->msg);
 302                 return -err->errno;
 303         }
 304
 305         return 0;
 306 }
 307
 308 static void viocd_release(struct cdrom_device_info *cdi)
 309 {
 310         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 311         HvLpEvent_Rc hvrc;
 312
 313         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 314                         HvLpEvent_Type_VirtualIo,
 315                         viomajorsubtype_cdio | viocdclose,
 316                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 317                         viopath_sourceinst(viopath_hostLp),
 318                         viopath_targetinst(viopath_hostLp), 0,
 319                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 320         if (hvrc != 0)
 321                 printk(VIOCD_KERN_WARNING
 322                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 323                                 (int)hvrc);
 324 }
 325
 326 /* Send a read or write request to OS/400 */
 327 static int send_request(struct request *req)
 328 {
 329         HvLpEvent_Rc hvrc;
 330         struct disk_info *diskinfo = req->rq_disk->private_data;
 331         u64 len;
 332         dma_addr_t dmaaddr;
 333         struct scatterlist sg;
 334
 335         BUG_ON(req->nr_phys_segments > 1);
 336         BUG_ON(rq_data_dir(req) != READ);
 337
 338         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 339                 printk(VIOCD_KERN_WARNING
 340                                 "error setting up scatter/gather list\n");
 341                 return -1;
 342         }
 343
 344         if (dma_map_sg(iSeries_vio_dev, &sg, 1, DMA_FROM_DEVICE) == 0) {
 345                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 346                 return -1;
 347         }
 348         dmaaddr = sg_dma_address(&sg);
 349         len = sg_dma_len(&sg);
 350
 351         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 352                         HvLpEvent_Type_VirtualIo,
 353                         viomajorsubtype_cdio | viocdread,
 354                         HvLpEvent_AckInd_DoAck,
 355                         HvLpEvent_AckType_ImmediateAck,
 356                         viopath_sourceinst(viopath_hostLp),
 357                         viopath_targetinst(viopath_hostLp),
 358                         (u64)req, VIOVERSION << 16,
 359                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 360                         (u64)req->sector * 512, len, 0);
 361         if (hvrc != HvLpEvent_Rc_Good) {
 362                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 363                 return -1;
 364         }
 365
 366         return 0;
 367 }
 368
 369
 370 static int rwreq;
 371
 372 static void do_viocd_request(request_queue_t *q)
 373 {
 374         struct request *req;
 375
 376         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 377                 if (!blk_fs_request(req))
 378                         end_request(req, 0);
 379                 else if (send_request(req) < 0) {
 380                         printk(VIOCD_KERN_WARNING
 381                                         "unable to send message to OS/400!");
 382                         end_request(req, 0);
 383                 } else
 384                         rwreq++;
 385         }
 386 }
 387
 388 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 389 {
 390         struct viocd_waitevent we;
 391         HvLpEvent_Rc hvrc;
 392         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 393
 394         init_completion(&we.com);
 395
 396         /* Send the open event to OS/400 */
 397         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 398                         HvLpEvent_Type_VirtualIo,
 399                         viomajorsubtype_cdio | viocdcheck,
 400                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 401                         viopath_sourceinst(viopath_hostLp),
 402                         viopath_targetinst(viopath_hostLp),
 403                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 404                         0, 0, 0);
 405         if (hvrc != 0) {
 406                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 407                                 (int)hvrc);
 408                 return -EIO;
 409         }
 410
 411         wait_for_completion(&we.com);
 412
 413         /* Check the return code.  If bad, assume no change */
 414         if (we.rc) {
 415                 const struct vio_error_entry *err =
 416                         vio_lookup_rc(viocd_err_table, we.sub_result);
 417                 printk(VIOCD_KERN_WARNING
 418                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 419                                 we.rc, we.sub_result, err->msg);
 420                 return 0;
 421         }
 422
 423         return we.changed;
 424 }
 425
 426 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 427 {
 428         HvLpEvent_Rc hvrc;
 429         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 430         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 431         u64 flags = !!locking;
 432         struct viocd_waitevent we;
 433
 434         init_completion(&we.com);
 435
 436         /* Send the lockdoor event to OS/400 */
 437         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 438                         HvLpEvent_Type_VirtualIo,
 439                         viomajorsubtype_cdio | viocdlockdoor,
 440                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 441                         viopath_sourceinst(viopath_hostLp),
 442                         viopath_targetinst(viopath_hostLp),
 443                         (u64)&we, VIOVERSION << 16,
 444                         (device_no << 48) | (flags << 32), 0, 0, 0);
 445         if (hvrc != 0) {
 446                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 447                                 (int)hvrc);
 448                 return -EIO;
 449         }
 450
 451         wait_for_completion(&we.com);
 452
 453         if (we.rc != 0)
 454                 return -EIO;
 455         return 0;
 456 }
 457
 458 /* This routine handles incoming CD LP events */
 459 static void vio_handle_cd_event(struct HvLpEvent *event)
 460 {
 461         struct viocdlpevent *bevent;
 462         struct viocd_waitevent *pwe;
 463         struct disk_info *di;
 464         unsigned long flags;
 465         struct request *req;
 466
 467
 468         if (event == NULL)
 469                 /* Notification that a partition went away! */
 470                 return;
 471         /* First, we should NEVER get an int here...only acks */
 472         if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
 473                 printk(VIOCD_KERN_WARNING
 474                                 "Yikes! got an int in viocd event handler!\n");
 475                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
 476                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 477                         HvCallEvent_ackLpEvent(event);
 478                 }
 479         }
 480
 481         bevent = (struct viocdlpevent *)event;
 482
 483         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 484         case viocdopen:
 485                 if (event->xRc == 0) {
 486                         di = &viocd_diskinfo[bevent->disk];
 487                         blk_queue_hardsect_size(viocd_queue,
 488                                         bevent->block_size);
 489                         set_capacity(di->viocd_disk,
 490                                         bevent->media_size *
 491                                         bevent->block_size / 512);
 492                 }
 493                 /* FALLTHROUGH !! */
 494         case viocdgetinfo:
 495         case viocdlockdoor:
 496                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 497 return_complete:
 498                 pwe->rc = event->xRc;
 499                 pwe->sub_result = bevent->sub_result;
 500                 complete(&pwe->com);
 501                 break;
 502
 503         case viocdcheck:
 504                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 505                 pwe->changed = bevent->flags;
 506                 goto return_complete;
 507
 508         case viocdclose:
 509                 break;
 510
 511         case viocdread:
 512                 /*
 513                  * Since this is running in interrupt mode, we need to
 514                  * make sure we're not stepping on any global I/O operations
 515                  */
 516                 spin_lock_irqsave(&viocd_reqlock, flags);
 517                 dma_unmap_single(iSeries_vio_dev, bevent->token, bevent->len,
 518                                 DMA_FROM_DEVICE);
 519                 req = (struct request *)bevent->event.xCorrelationToken;
 520                 rwreq--;
 521
 522                 if (event->xRc != HvLpEvent_Rc_Good) {
 523                         const struct vio_error_entry *err =
 524                                 vio_lookup_rc(viocd_err_table,
 525                                                 bevent->sub_result);
 526                         printk(VIOCD_KERN_WARNING "request %p failed "
 527                                         "with rc %d:0x%04X: %s\n",
 528                                         req, event->xRc,
 529                                         bevent->sub_result, err->msg);
 530                         end_request(req, 0);
 531                 } else
 532                         end_request(req, 1);
 533
 534                 /* restart handling of incoming requests */
 535                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 536                 blk_run_queue(viocd_queue);
 537                 break;
 538
 539         default:
 540                 printk(VIOCD_KERN_WARNING
 541                                 "message with invalid subtype %0x04X!\n",
 542                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 543                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
 544                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 545                         HvCallEvent_ackLpEvent(event);
 546                 }
 547         }
 548 }
 549
 550 static struct cdrom_device_ops viocd_dops = {
 551         .open = viocd_open,
 552         .release = viocd_release,
 553         .media_changed = viocd_media_changed,
 554         .lock_door = viocd_lock_door,
 555         .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_IOCTLS | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM
 556 };
 557
 558 static int __init find_capability(const char *type)
 559 {
 560         struct capability_entry *entry;
 561
 562         for(entry = capability_table; entry->type; ++entry)
 563                 if(!strncmp(entry->type, type, 4))
 564                         break;
 565         return entry->capability;
 566 }
 567
 568 static int __init viocd_init(void)
 569 {
 570         struct gendisk *gendisk;
 571         int deviceno;
 572         int ret = 0;
 573         struct proc_dir_entry *e;
 574
 575         if (viopath_hostLp == HvLpIndexInvalid) {
 576                 vio_set_hostlp();
 577                 /* If we don't have a host, bail out */
 578                 if (viopath_hostLp == HvLpIndexInvalid)
 579                         return -ENODEV;
 580         }
 581
 582         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 583                         viopath_hostLp);
 584
 585         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 586                 printk(VIOCD_KERN_WARNING
 587                                 "Unable to get major %d for %s\n",
 588                                 VIOCD_MAJOR, VIOCD_DEVICE);
 589                 return -EIO;
 590         }
 591
 592         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 593                         MAX_CD_REQ + 2);
 594         if (ret) {
 595                 printk(VIOCD_KERN_WARNING
 596                                 "error opening path to host partition %d\n",
 597                                 viopath_hostLp);
 598                 goto out_unregister;
 599         }
 600
 601         /* Initialize our request handler */
 602         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 603
 604         get_viocd_info();
 605         if (viocd_numdev == 0)
 606                 goto out_undo_vio;
 607
 608         ret = -ENOMEM;
 609         spin_lock_init(&viocd_reqlock);
 610         viocd_queue = blk_init_queue(do_viocd_request, &viocd_reqlock);
 611         if (viocd_queue == NULL)
 612                 goto out_unregister;
 613         blk_queue_max_hw_segments(viocd_queue, 1);
 614         blk_queue_max_phys_segments(viocd_queue, 1);
 615         blk_queue_max_sectors(viocd_queue, 4096 / 512);
 616
 617         /* initialize units */
 618         for (deviceno = 0; deviceno < viocd_numdev; deviceno++) {
 619                 struct disk_info *d = &viocd_diskinfo[deviceno];
 620                 struct cdrom_device_info *c = &d->viocd_info;
 621                 struct cdrom_info *ci = &viocd_unitinfo[deviceno];
 622
 623                 c->ops = &viocd_dops;
 624                 c->speed = 4;
 625                 c->capacity = 1;
 626                 c->handle = d;
 627                 c->mask = ~find_capability(ci->type);
 628                 sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 629
 630                 if (register_cdrom(c) != 0) {
 631                         printk(VIOCD_KERN_WARNING
 632                                         "Cannot register viocd CD-ROM %s!\n",
 633                                         c->name);
 634                         continue;
 635                 }
 636                 printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 637                                 "type %4.4s, model %3.3s\n",
 638                                 c->name, ci->rsrcname, ci->type, ci->model);
 639                 gendisk = alloc_disk(1);
 640                 if (gendisk == NULL) {
 641                         printk(VIOCD_KERN_WARNING
 642                                         "Cannot create gendisk for %s!\n",
 643                                         c->name);
 644                         unregister_cdrom(c);
 645                         continue;
 646                 }
 647                 gendisk->major = VIOCD_MAJOR;
 648                 gendisk->first_minor = deviceno;
 649                 strncpy(gendisk->disk_name, c->name,
 650                                 sizeof(gendisk->disk_name));
 651                 snprintf(gendisk->devfs_name, sizeof(gendisk->devfs_name),
 652                                 VIOCD_DEVICE_DEVFS "%d", deviceno);
 653                 gendisk->queue = viocd_queue;
 654                 gendisk->fops = &viocd_fops;
 655                 gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 656                 set_capacity(gendisk, 0);
 657                 gendisk->private_data = d;
 658                 d->viocd_disk = gendisk;
 659                 add_disk(gendisk);
 660         }
 661
 662         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 663         if (e) {
 664                 e->owner = THIS_MODULE;
 665                 e->proc_fops = &proc_viocd_operations;
 666         }
 667
 668         return 0;
 669
 670 out_undo_vio:
 671         vio_clearHandler(viomajorsubtype_cdio);
 672         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 673 out_unregister:
 674         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 675         return ret;
 676 }
 677
 678 static void __exit viocd_exit(void)
 679 {
 680         int deviceno;
 681
 682         remove_proc_entry("iSeries/viocd", NULL);
 683         for (deviceno = 0; deviceno < viocd_numdev; deviceno++) {
 684                 struct disk_info *d = &viocd_diskinfo[deviceno];
 685                 if (unregister_cdrom(&d->viocd_info) != 0)
 686                         printk(VIOCD_KERN_WARNING
 687                                         "Cannot unregister viocd CD-ROM %s!\n",
 688                                         d->viocd_info.name);
 689                 del_gendisk(d->viocd_disk);
 690                 put_disk(d->viocd_disk);
 691         }
 692         blk_cleanup_queue(viocd_queue);
 693         if (viocd_unitinfo != NULL)
 694                 dma_free_coherent(iSeries_vio_dev,
 695                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 696                                 viocd_unitinfo, unitinfo_dmaaddr);
 697         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 698         vio_clearHandler(viomajorsubtype_cdio);
 699         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 700 }
 701
 702 module_init(viocd_init);
 703 module_exit(viocd_exit);
 704 MODULE_LICENSE("GPL");