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
  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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <linux/major.h>
  37 #include <linux/blkdev.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/errno.h>
  40 #include <linux/init.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/module.h>
  43 #include <linux/completion.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/smp_lock.h>
  46 #include <linux/seq_file.h>
  47 #include <linux/scatterlist.h>
  48
  49 #include <asm/vio.h>
  50 #include <asm/iseries/hv_types.h>
  51 #include <asm/iseries/hv_lp_event.h>
  52 #include <asm/iseries/vio.h>
  53 #include <asm/firmware.h>
  54
  55 #define VIOCD_DEVICE                    "iseries/vcd"
  56
  57 #define VIOCD_VERS "1.06"
  58
  59 /*
  60  * Should probably make this a module parameter....sigh
  61  */
  62 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  63
  64 static const struct vio_error_entry viocd_err_table[] = {
  65         {0x0201, EINVAL, "Invalid Range"},
  66         {0x0202, EINVAL, "Invalid Token"},
  67         {0x0203, EIO, "DMA Error"},
  68         {0x0204, EIO, "Use Error"},
  69         {0x0205, EIO, "Release Error"},
  70         {0x0206, EINVAL, "Invalid CD"},
  71         {0x020C, EROFS, "Read Only Device"},
  72         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  73         {0x020E, EIO, "Optical System Error (Varied Off?)"},
  74         {0x02FF, EIO, "Internal Error"},
  75         {0x3010, EIO, "Changed Volume"},
  76         {0xC100, EIO, "Optical System Error"},
  77         {0x0000, 0, NULL},
  78 };
  79
  80 /*
  81  * This is the structure we use to exchange info between driver and interrupt
  82  * handler
  83  */
  84 struct viocd_waitevent {
  85         struct completion       com;
  86         int                     rc;
  87         u16                     sub_result;
  88         int                     changed;
  89 };
  90
  91 /* this is a lookup table for the true capabilities of a device */
  92 struct capability_entry {
  93         char    *type;
  94         int     capability;
  95 };
  96
  97 static struct capability_entry capability_table[] __initdata = {
  98         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
  99         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 100         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 101         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 102         { "6321", CDC_LOCK },
 103         { "632B", 0 },
 104         { NULL  , CDC_LOCK },
 105 };
 106
 107 /* These are our internal structures for keeping track of devices */
 108 static int viocd_numdev;
 109
 110 struct disk_info {
 111         struct gendisk                  *viocd_disk;
 112         struct cdrom_device_info        viocd_info;
 113         struct device                   *dev;
 114         const char                      *rsrcname;
 115         const char                      *type;
 116         const char                      *model;
 117 };
 118 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 119
 120 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 121
 122 static spinlock_t viocd_reqlock;
 123
 124 #define MAX_CD_REQ      1
 125
 126 /* procfs support */
 127 static int proc_viocd_show(struct seq_file *m, void *v)
 128 {
 129         int i;
 130
 131         for (i = 0; i < viocd_numdev; i++) {
 132                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 133                                 "type %4.4s, model %3.3s\n",
 134                                 i, viocd_diskinfo[i].rsrcname,
 135                                 viocd_diskinfo[i].type,
 136                                 viocd_diskinfo[i].model);
 137         }
 138         return 0;
 139 }
 140
 141 static int proc_viocd_open(struct inode *inode, struct file *file)
 142 {
 143         return single_open(file, proc_viocd_show, NULL);
 144 }
 145
 146 static const struct file_operations proc_viocd_operations = {
 147         .owner          = THIS_MODULE,
 148         .open           = proc_viocd_open,
 149         .read           = seq_read,
 150         .llseek         = seq_lseek,
 151         .release        = single_release,
 152 };
 153
 154 static int viocd_blk_open(struct block_device *bdev, fmode_t mode)
 155 {
 156         struct disk_info *di = bdev->bd_disk->private_data;
 157         int ret;
 158
 159         lock_kernel();
 160         ret = cdrom_open(&di->viocd_info, bdev, mode);
 161         unlock_kernel();
 162
 163         return ret;
 164 }
 165
 166 static int viocd_blk_release(struct gendisk *disk, fmode_t mode)
 167 {
 168         struct disk_info *di = disk->private_data;
 169         lock_kernel();
 170         cdrom_release(&di->viocd_info, mode);
 171         unlock_kernel();
 172         return 0;
 173 }
 174
 175 static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
 176                 unsigned cmd, unsigned long arg)
 177 {
 178         struct disk_info *di = bdev->bd_disk->private_data;
 179         int ret;
 180
 181         lock_kernel();
 182         ret = cdrom_ioctl(&di->viocd_info, bdev, mode, cmd, arg);
 183         unlock_kernel();
 184
 185         return ret;
 186 }
 187
 188 static int viocd_blk_media_changed(struct gendisk *disk)
 189 {
 190         struct disk_info *di = disk->private_data;
 191         return cdrom_media_changed(&di->viocd_info);
 192 }
 193
 194 static const struct block_device_operations viocd_fops = {
 195         .owner =                THIS_MODULE,
 196         .open =                 viocd_blk_open,
 197         .release =              viocd_blk_release,
 198         .ioctl =                viocd_blk_ioctl,
 199         .media_changed =        viocd_blk_media_changed,
 200 };
 201
 202 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 203 {
 204         struct disk_info *diskinfo = cdi->handle;
 205         int device_no = DEVICE_NR(diskinfo);
 206         HvLpEvent_Rc hvrc;
 207         struct viocd_waitevent we;
 208
 209         init_completion(&we.com);
 210         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 211                         HvLpEvent_Type_VirtualIo,
 212                         viomajorsubtype_cdio | viocdopen,
 213                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 214                         viopath_sourceinst(viopath_hostLp),
 215                         viopath_targetinst(viopath_hostLp),
 216                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 217                         0, 0, 0);
 218         if (hvrc != 0) {
 219                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 220                            (int)hvrc);
 221                 return -EIO;
 222         }
 223
 224         wait_for_completion(&we.com);
 225
 226         if (we.rc) {
 227                 const struct vio_error_entry *err =
 228                         vio_lookup_rc(viocd_err_table, we.sub_result);
 229                 pr_warning("bad rc %d:0x%04X on open: %s\n",
 230                            we.rc, we.sub_result, err->msg);
 231                 return -err->errno;
 232         }
 233
 234         return 0;
 235 }
 236
 237 static void viocd_release(struct cdrom_device_info *cdi)
 238 {
 239         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 240         HvLpEvent_Rc hvrc;
 241
 242         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 243                         HvLpEvent_Type_VirtualIo,
 244                         viomajorsubtype_cdio | viocdclose,
 245                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 246                         viopath_sourceinst(viopath_hostLp),
 247                         viopath_targetinst(viopath_hostLp), 0,
 248                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 249         if (hvrc != 0)
 250                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 251                            (int)hvrc);
 252 }
 253
 254 /* Send a read or write request to OS/400 */
 255 static int send_request(struct request *req)
 256 {
 257         HvLpEvent_Rc hvrc;
 258         struct disk_info *diskinfo = req->rq_disk->private_data;
 259         u64 len;
 260         dma_addr_t dmaaddr;
 261         int direction;
 262         u16 cmd;
 263         struct scatterlist sg;
 264
 265         BUG_ON(req->nr_phys_segments > 1);
 266
 267         if (rq_data_dir(req) == READ) {
 268                 direction = DMA_FROM_DEVICE;
 269                 cmd = viomajorsubtype_cdio | viocdread;
 270         } else {
 271                 direction = DMA_TO_DEVICE;
 272                 cmd = viomajorsubtype_cdio | viocdwrite;
 273         }
 274
 275         sg_init_table(&sg, 1);
 276         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 277                 pr_warning("error setting up scatter/gather list\n");
 278                 return -1;
 279         }
 280
 281         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 282                 pr_warning("error allocating sg tce\n");
 283                 return -1;
 284         }
 285         dmaaddr = sg_dma_address(&sg);
 286         len = sg_dma_len(&sg);
 287
 288         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 289                         HvLpEvent_Type_VirtualIo, cmd,
 290                         HvLpEvent_AckInd_DoAck,
 291                         HvLpEvent_AckType_ImmediateAck,
 292                         viopath_sourceinst(viopath_hostLp),
 293                         viopath_targetinst(viopath_hostLp),
 294                         (u64)req, VIOVERSION << 16,
 295                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 296                         (u64)blk_rq_pos(req) * 512, len, 0);
 297         if (hvrc != HvLpEvent_Rc_Good) {
 298                 pr_warning("hv error on op %d\n", (int)hvrc);
 299                 return -1;
 300         }
 301
 302         return 0;
 303 }
 304
 305 static int rwreq;
 306
 307 static void do_viocd_request(struct request_queue *q)
 308 {
 309         struct request *req;
 310
 311         while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
 312                 if (req->cmd_type != REQ_TYPE_FS)
 313                         __blk_end_request_all(req, -EIO);
 314                 else if (send_request(req) < 0) {
 315                         pr_warning("unable to send message to OS/400!\n");
 316                         __blk_end_request_all(req, -EIO);
 317                 } else
 318                         rwreq++;
 319         }
 320 }
 321
 322 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 323 {
 324         struct viocd_waitevent we;
 325         HvLpEvent_Rc hvrc;
 326         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 327
 328         init_completion(&we.com);
 329
 330         /* Send the open event to OS/400 */
 331         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 332                         HvLpEvent_Type_VirtualIo,
 333                         viomajorsubtype_cdio | viocdcheck,
 334                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 335                         viopath_sourceinst(viopath_hostLp),
 336                         viopath_targetinst(viopath_hostLp),
 337                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 338                         0, 0, 0);
 339         if (hvrc != 0) {
 340                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 341                            (int)hvrc);
 342                 return -EIO;
 343         }
 344
 345         wait_for_completion(&we.com);
 346
 347         /* Check the return code.  If bad, assume no change */
 348         if (we.rc) {
 349                 const struct vio_error_entry *err =
 350                         vio_lookup_rc(viocd_err_table, we.sub_result);
 351                 pr_warning("bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 352                            we.rc, we.sub_result, err->msg);
 353                 return 0;
 354         }
 355
 356         return we.changed;
 357 }
 358
 359 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 360 {
 361         HvLpEvent_Rc hvrc;
 362         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 363         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 364         u64 flags = !!locking;
 365         struct viocd_waitevent we;
 366
 367         init_completion(&we.com);
 368
 369         /* Send the lockdoor event to OS/400 */
 370         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 371                         HvLpEvent_Type_VirtualIo,
 372                         viomajorsubtype_cdio | viocdlockdoor,
 373                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 374                         viopath_sourceinst(viopath_hostLp),
 375                         viopath_targetinst(viopath_hostLp),
 376                         (u64)&we, VIOVERSION << 16,
 377                         (device_no << 48) | (flags << 32), 0, 0, 0);
 378         if (hvrc != 0) {
 379                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
 380                            (int)hvrc);
 381                 return -EIO;
 382         }
 383
 384         wait_for_completion(&we.com);
 385
 386         if (we.rc != 0)
 387                 return -EIO;
 388         return 0;
 389 }
 390
 391 static int viocd_packet(struct cdrom_device_info *cdi,
 392                 struct packet_command *cgc)
 393 {
 394         unsigned int buflen = cgc->buflen;
 395         int ret = -EIO;
 396
 397         switch (cgc->cmd[0]) {
 398         case GPCMD_READ_DISC_INFO:
 399                 {
 400                         disc_information *di = (disc_information *)cgc->buffer;
 401
 402                         if (buflen >= 2) {
 403                                 di->disc_information_length = cpu_to_be16(1);
 404                                 ret = 0;
 405                         }
 406                         if (buflen >= 3)
 407                                 di->erasable =
 408                                         (cdi->ops->capability & ~cdi->mask
 409                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 410                 }
 411                 break;
 412         case GPCMD_GET_CONFIGURATION:
 413                 if (cgc->cmd[3] == CDF_RWRT) {
 414                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 415
 416                         if ((buflen >=
 417                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 418                             (cdi->ops->capability & ~cdi->mask
 419                              & (CDC_DVD_RAM | CDC_RAM))) {
 420                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 421                                 rfd->curr = 1;
 422                                 ret = 0;
 423                         }
 424                 }
 425                 break;
 426         default:
 427                 if (cgc->sense) {
 428                         /* indicate Unknown code */
 429                         cgc->sense->sense_key = 0x05;
 430                         cgc->sense->asc = 0x20;
 431                         cgc->sense->ascq = 0x00;
 432                 }
 433                 break;
 434         }
 435
 436         cgc->stat = ret;
 437         return ret;
 438 }
 439
 440 static void restart_all_queues(int first_index)
 441 {
 442         int i;
 443
 444         for (i = first_index + 1; i < viocd_numdev; i++)
 445                 if (viocd_diskinfo[i].viocd_disk)
 446                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 447         for (i = 0; i <= first_index; i++)
 448                 if (viocd_diskinfo[i].viocd_disk)
 449                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 450 }
 451
 452 /* This routine handles incoming CD LP events */
 453 static void vio_handle_cd_event(struct HvLpEvent *event)
 454 {
 455         struct viocdlpevent *bevent;
 456         struct viocd_waitevent *pwe;
 457         struct disk_info *di;
 458         unsigned long flags;
 459         struct request *req;
 460
 461
 462         if (event == NULL)
 463                 /* Notification that a partition went away! */
 464                 return;
 465         /* First, we should NEVER get an int here...only acks */
 466         if (hvlpevent_is_int(event)) {
 467                 pr_warning("Yikes! got an int in viocd event handler!\n");
 468                 if (hvlpevent_need_ack(event)) {
 469                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 470                         HvCallEvent_ackLpEvent(event);
 471                 }
 472         }
 473
 474         bevent = (struct viocdlpevent *)event;
 475
 476         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 477         case viocdopen:
 478                 if (event->xRc == 0) {
 479                         di = &viocd_diskinfo[bevent->disk];
 480                         blk_queue_logical_block_size(di->viocd_disk->queue,
 481                                                      bevent->block_size);
 482                         set_capacity(di->viocd_disk,
 483                                         bevent->media_size *
 484                                         bevent->block_size / 512);
 485                 }
 486                 /* FALLTHROUGH !! */
 487         case viocdlockdoor:
 488                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 489 return_complete:
 490                 pwe->rc = event->xRc;
 491                 pwe->sub_result = bevent->sub_result;
 492                 complete(&pwe->com);
 493                 break;
 494
 495         case viocdcheck:
 496                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 497                 pwe->changed = bevent->flags;
 498                 goto return_complete;
 499
 500         case viocdclose:
 501                 break;
 502
 503         case viocdwrite:
 504         case viocdread:
 505                 /*
 506                  * Since this is running in interrupt mode, we need to
 507                  * make sure we're not stepping on any global I/O operations
 508                  */
 509                 di = &viocd_diskinfo[bevent->disk];
 510                 spin_lock_irqsave(&viocd_reqlock, flags);
 511                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 512                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 513                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 514                 req = (struct request *)bevent->event.xCorrelationToken;
 515                 rwreq--;
 516
 517                 if (event->xRc != HvLpEvent_Rc_Good) {
 518                         const struct vio_error_entry *err =
 519                                 vio_lookup_rc(viocd_err_table,
 520                                                 bevent->sub_result);
 521                         pr_warning("request %p failed with rc %d:0x%04X: %s\n",
 522                                    req, event->xRc,
 523                                    bevent->sub_result, err->msg);
 524                         __blk_end_request_all(req, -EIO);
 525                 } else
 526                         __blk_end_request_all(req, 0);
 527
 528                 /* restart handling of incoming requests */
 529                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 530                 restart_all_queues(bevent->disk);
 531                 break;
 532
 533         default:
 534                 pr_warning("message with invalid subtype %0x04X!\n",
 535                            event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 536                 if (hvlpevent_need_ack(event)) {
 537                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 538                         HvCallEvent_ackLpEvent(event);
 539                 }
 540         }
 541 }
 542
 543 static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 544                              void *arg)
 545 {
 546         return -EINVAL;
 547 }
 548
 549 static struct cdrom_device_ops viocd_dops = {
 550         .open = viocd_open,
 551         .release = viocd_release,
 552         .media_changed = viocd_media_changed,
 553         .lock_door = viocd_lock_door,
 554         .generic_packet = viocd_packet,
 555         .audio_ioctl = viocd_audio_ioctl,
 556         .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_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
 557 };
 558
 559 static int find_capability(const char *type)
 560 {
 561         struct capability_entry *entry;
 562
 563         for(entry = capability_table; entry->type; ++entry)
 564                 if(!strncmp(entry->type, type, 4))
 565                         break;
 566         return entry->capability;
 567 }
 568
 569 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 570 {
 571         struct gendisk *gendisk;
 572         int deviceno;
 573         struct disk_info *d;
 574         struct cdrom_device_info *c;
 575         struct request_queue *q;
 576         struct device_node *node = vdev->dev.of_node;
 577
 578         deviceno = vdev->unit_address;
 579         if (deviceno >= VIOCD_MAX_CD)
 580                 return -ENODEV;
 581         if (!node)
 582                 return -ENODEV;
 583
 584         if (deviceno >= viocd_numdev)
 585                 viocd_numdev = deviceno + 1;
 586
 587         d = &viocd_diskinfo[deviceno];
 588         d->rsrcname = of_get_property(node, "linux,vio_rsrcname", NULL);
 589         d->type = of_get_property(node, "linux,vio_type", NULL);
 590         d->model = of_get_property(node, "linux,vio_model", NULL);
 591
 592         c = &d->viocd_info;
 593
 594         c->ops = &viocd_dops;
 595         c->speed = 4;
 596         c->capacity = 1;
 597         c->handle = d;
 598         c->mask = ~find_capability(d->type);
 599         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 600
 601         if (register_cdrom(c) != 0) {
 602                 pr_warning("Cannot register viocd CD-ROM %s!\n", c->name);
 603                 goto out;
 604         }
 605         pr_info("cd %s is iSeries resource %10.10s type %4.4s, model %3.3s\n",
 606                 c->name, d->rsrcname, d->type, d->model);
 607         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 608         if (q == NULL) {
 609                 pr_warning("Cannot allocate queue for %s!\n", c->name);
 610                 goto out_unregister_cdrom;
 611         }
 612         gendisk = alloc_disk(1);
 613         if (gendisk == NULL) {
 614                 pr_warning("Cannot create gendisk for %s!\n", c->name);
 615                 goto out_cleanup_queue;
 616         }
 617         gendisk->major = VIOCD_MAJOR;
 618         gendisk->first_minor = deviceno;
 619         strncpy(gendisk->disk_name, c->name,
 620                         sizeof(gendisk->disk_name));
 621         blk_queue_max_segments(q, 1);
 622         blk_queue_max_hw_sectors(q, 4096 / 512);
 623         gendisk->queue = q;
 624         gendisk->fops = &viocd_fops;
 625         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 626         set_capacity(gendisk, 0);
 627         gendisk->private_data = d;
 628         d->viocd_disk = gendisk;
 629         d->dev = &vdev->dev;
 630         gendisk->driverfs_dev = d->dev;
 631         add_disk(gendisk);
 632         return 0;
 633
 634 out_cleanup_queue:
 635         blk_cleanup_queue(q);
 636 out_unregister_cdrom:
 637         unregister_cdrom(c);
 638 out:
 639         return -ENODEV;
 640 }
 641
 642 static int viocd_remove(struct vio_dev *vdev)
 643 {
 644         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 645
 646         unregister_cdrom(&d->viocd_info);
 647         del_gendisk(d->viocd_disk);
 648         blk_cleanup_queue(d->viocd_disk->queue);
 649         put_disk(d->viocd_disk);
 650         return 0;
 651 }
 652
 653 /**
 654  * viocd_device_table: Used by vio.c to match devices that we
 655  * support.
 656  */
 657 static struct vio_device_id viocd_device_table[] __devinitdata = {
 658         { "block", "IBM,iSeries-viocd" },
 659         { "", "" }
 660 };
 661 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 662
 663 static struct vio_driver viocd_driver = {
 664         .id_table = viocd_device_table,
 665         .probe = viocd_probe,
 666         .remove = viocd_remove,
 667         .driver = {
 668                 .name = "viocd",
 669                 .owner = THIS_MODULE,
 670         }
 671 };
 672
 673 static int __init viocd_init(void)
 674 {
 675         int ret = 0;
 676
 677         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 678                 return -ENODEV;
 679
 680         if (viopath_hostLp == HvLpIndexInvalid) {
 681                 vio_set_hostlp();
 682                 /* If we don't have a host, bail out */
 683                 if (viopath_hostLp == HvLpIndexInvalid)
 684                         return -ENODEV;
 685         }
 686
 687         pr_info("vers " VIOCD_VERS ", hosting partition %d\n", viopath_hostLp);
 688
 689         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 690                 pr_warning("Unable to get major %d for %s\n",
 691                            VIOCD_MAJOR, VIOCD_DEVICE);
 692                 return -EIO;
 693         }
 694
 695         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 696                         MAX_CD_REQ + 2);
 697         if (ret) {
 698                 pr_warning("error opening path to host partition %d\n",
 699                            viopath_hostLp);
 700                 goto out_unregister;
 701         }
 702
 703         /* Initialize our request handler */
 704         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 705
 706         spin_lock_init(&viocd_reqlock);
 707
 708         ret = vio_register_driver(&viocd_driver);
 709         if (ret)
 710                 goto out_free_info;
 711
 712         proc_create("iSeries/viocd", S_IFREG|S_IRUGO, NULL,
 713                     &proc_viocd_operations);
 714         return 0;
 715
 716 out_free_info:
 717         vio_clearHandler(viomajorsubtype_cdio);
 718         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 719 out_unregister:
 720         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 721         return ret;
 722 }
 723
 724 static void __exit viocd_exit(void)
 725 {
 726         remove_proc_entry("iSeries/viocd", NULL);
 727         vio_unregister_driver(&viocd_driver);
 728         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 729         vio_clearHandler(viomajorsubtype_cdio);
 730         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 731 }
 732
 733 module_init(viocd_init);
 734 module_exit(viocd_exit);
 735 MODULE_LICENSE("GPL");