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/vio.h>
  48 #include <asm/scatterlist.h>
  49 #include <asm/iSeries/HvTypes.h>
  50 #include <asm/iSeries/HvLpEvent.h>
  51 #include <asm/iSeries/vio.h>
  52
  53 #define VIOCD_DEVICE                    "iseries/vcd"
  54 #define VIOCD_DEVICE_DEVFS              "iseries/vcd"
  55
  56 #define VIOCD_VERS "1.06"
  57
  58 #define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
  59 #define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
  60
  61 struct viocdlpevent {
  62         struct HvLpEvent        event;
  63         u32                     reserved;
  64         u16                     version;
  65         u16                     sub_result;
  66         u16                     disk;
  67         u16                     flags;
  68         u32                     token;
  69         u64                     offset;         /* On open, max number of disks */
  70         u64                     len;            /* On open, size of the disk */
  71         u32                     block_size;     /* Only set on open */
  72         u32                     media_size;     /* Only set on open */
  73 };
  74
  75 enum viocdsubtype {
  76         viocdopen = 0x0001,
  77         viocdclose = 0x0002,
  78         viocdread = 0x0003,
  79         viocdwrite = 0x0004,
  80         viocdlockdoor = 0x0005,
  81         viocdgetinfo = 0x0006,
  82         viocdcheck = 0x0007
  83 };
  84
  85 /*
  86  * Should probably make this a module parameter....sigh
  87  */
  88 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  89
  90 static const struct vio_error_entry viocd_err_table[] = {
  91         {0x0201, EINVAL, "Invalid Range"},
  92         {0x0202, EINVAL, "Invalid Token"},
  93         {0x0203, EIO, "DMA Error"},
  94         {0x0204, EIO, "Use Error"},
  95         {0x0205, EIO, "Release Error"},
  96         {0x0206, EINVAL, "Invalid CD"},
  97         {0x020C, EROFS, "Read Only Device"},
  98         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  99         {0x020E, EIO, "Optical System Error (Varied Off?)"},
 100         {0x02FF, EIO, "Internal Error"},
 101         {0x3010, EIO, "Changed Volume"},
 102         {0xC100, EIO, "Optical System Error"},
 103         {0x0000, 0, NULL},
 104 };
 105
 106 /*
 107  * This is the structure we use to exchange info between driver and interrupt
 108  * handler
 109  */
 110 struct viocd_waitevent {
 111         struct completion       com;
 112         int                     rc;
 113         u16                     sub_result;
 114         int                     changed;
 115 };
 116
 117 /* this is a lookup table for the true capabilities of a device */
 118 struct capability_entry {
 119         char    *type;
 120         int     capability;
 121 };
 122
 123 static struct capability_entry capability_table[] __initdata = {
 124         { "6330", CDC_LOCK | CDC_DVD_RAM },
 125         { "6321", CDC_LOCK },
 126         { "632B", 0 },
 127         { NULL  , CDC_LOCK },
 128 };
 129
 130 /* These are our internal structures for keeping track of devices */
 131 static int viocd_numdev;
 132
 133 struct cdrom_info {
 134         char    rsrcname[10];
 135         char    type[4];
 136         char    model[3];
 137 };
 138 /*
 139  * This needs to be allocated since it is passed to the
 140  * Hypervisor and we may be a module.
 141  */
 142 static struct cdrom_info *viocd_unitinfo;
 143 static dma_addr_t unitinfo_dmaaddr;
 144
 145 struct disk_info {
 146         struct gendisk                  *viocd_disk;
 147         struct cdrom_device_info        viocd_info;
 148         struct device                   *dev;
 149 };
 150 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 151
 152 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 153
 154 static request_queue_t *viocd_queue;
 155 static spinlock_t viocd_reqlock;
 156
 157 #define MAX_CD_REQ      1
 158
 159 /* procfs support */
 160 static int proc_viocd_show(struct seq_file *m, void *v)
 161 {
 162         int i;
 163
 164         for (i = 0; i < viocd_numdev; i++) {
 165                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 166                                 "type %4.4s, model %3.3s\n",
 167                                 i, viocd_unitinfo[i].rsrcname,
 168                                 viocd_unitinfo[i].type,
 169                                 viocd_unitinfo[i].model);
 170         }
 171         return 0;
 172 }
 173
 174 static int proc_viocd_open(struct inode *inode, struct file *file)
 175 {
 176         return single_open(file, proc_viocd_show, NULL);
 177 }
 178
 179 static struct file_operations proc_viocd_operations = {
 180         .open           = proc_viocd_open,
 181         .read           = seq_read,
 182         .llseek         = seq_lseek,
 183         .release        = single_release,
 184 };
 185
 186 static int viocd_blk_open(struct inode *inode, struct file *file)
 187 {
 188         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 189         return cdrom_open(&di->viocd_info, inode, file);
 190 }
 191
 192 static int viocd_blk_release(struct inode *inode, struct file *file)
 193 {
 194         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 195         return cdrom_release(&di->viocd_info, file);
 196 }
 197
 198 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 199                 unsigned cmd, unsigned long arg)
 200 {
 201         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 202         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
 203 }
 204
 205 static int viocd_blk_media_changed(struct gendisk *disk)
 206 {
 207         struct disk_info *di = disk->private_data;
 208         return cdrom_media_changed(&di->viocd_info);
 209 }
 210
 211 struct block_device_operations viocd_fops = {
 212         .owner =                THIS_MODULE,
 213         .open =                 viocd_blk_open,
 214         .release =              viocd_blk_release,
 215         .ioctl =                viocd_blk_ioctl,
 216         .media_changed =        viocd_blk_media_changed,
 217 };
 218
 219 /* Get info on CD devices from OS/400 */
 220 static void __init get_viocd_info(void)
 221 {
 222         HvLpEvent_Rc hvrc;
 223         int i;
 224         struct viocd_waitevent we;
 225
 226         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
 227                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 228                         &unitinfo_dmaaddr, GFP_ATOMIC);
 229         if (viocd_unitinfo == NULL) {
 230                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
 231                 return;
 232         }
 233
 234         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
 235
 236         init_completion(&we.com);
 237
 238         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 239                         HvLpEvent_Type_VirtualIo,
 240                         viomajorsubtype_cdio | viocdgetinfo,
 241                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 242                         viopath_sourceinst(viopath_hostLp),
 243                         viopath_targetinst(viopath_hostLp),
 244                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
 245                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
 246         if (hvrc != HvLpEvent_Rc_Good) {
 247                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
 248                                 (int)hvrc);
 249                 goto error_ret;
 250         }
 251
 252         wait_for_completion(&we.com);
 253
 254         if (we.rc) {
 255                 const struct vio_error_entry *err =
 256                         vio_lookup_rc(viocd_err_table, we.sub_result);
 257                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
 258                                 we.rc, we.sub_result, err->msg);
 259                 goto error_ret;
 260         }
 261
 262         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
 263                 viocd_numdev++;
 264
 265 error_ret:
 266         if (viocd_numdev == 0) {
 267                 dma_free_coherent(iSeries_vio_dev,
 268                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 269                                 viocd_unitinfo, unitinfo_dmaaddr);
 270                 viocd_unitinfo = NULL;
 271         }
 272 }
 273
 274 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 275 {
 276         struct disk_info *diskinfo = cdi->handle;
 277         int device_no = DEVICE_NR(diskinfo);
 278         HvLpEvent_Rc hvrc;
 279         struct viocd_waitevent we;
 280
 281         init_completion(&we.com);
 282         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 283                         HvLpEvent_Type_VirtualIo,
 284                         viomajorsubtype_cdio | viocdopen,
 285                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 286                         viopath_sourceinst(viopath_hostLp),
 287                         viopath_targetinst(viopath_hostLp),
 288                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 289                         0, 0, 0);
 290         if (hvrc != 0) {
 291                 printk(VIOCD_KERN_WARNING
 292                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 293                                 (int)hvrc);
 294                 return -EIO;
 295         }
 296
 297         wait_for_completion(&we.com);
 298
 299         if (we.rc) {
 300                 const struct vio_error_entry *err =
 301                         vio_lookup_rc(viocd_err_table, we.sub_result);
 302                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 303                                 we.rc, we.sub_result, err->msg);
 304                 return -err->errno;
 305         }
 306
 307         return 0;
 308 }
 309
 310 static void viocd_release(struct cdrom_device_info *cdi)
 311 {
 312         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 313         HvLpEvent_Rc hvrc;
 314
 315         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 316                         HvLpEvent_Type_VirtualIo,
 317                         viomajorsubtype_cdio | viocdclose,
 318                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 319                         viopath_sourceinst(viopath_hostLp),
 320                         viopath_targetinst(viopath_hostLp), 0,
 321                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 322         if (hvrc != 0)
 323                 printk(VIOCD_KERN_WARNING
 324                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 325                                 (int)hvrc);
 326 }
 327
 328 /* Send a read or write request to OS/400 */
 329 static int send_request(struct request *req)
 330 {
 331         HvLpEvent_Rc hvrc;
 332         struct disk_info *diskinfo = req->rq_disk->private_data;
 333         u64 len;
 334         dma_addr_t dmaaddr;
 335         struct scatterlist sg;
 336
 337         BUG_ON(req->nr_phys_segments > 1);
 338         BUG_ON(rq_data_dir(req) != READ);
 339
 340         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 341                 printk(VIOCD_KERN_WARNING
 342                                 "error setting up scatter/gather list\n");
 343                 return -1;
 344         }
 345
 346         if (dma_map_sg(diskinfo->dev, &sg, 1, DMA_FROM_DEVICE) == 0) {
 347                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 348                 return -1;
 349         }
 350         dmaaddr = sg_dma_address(&sg);
 351         len = sg_dma_len(&sg);
 352
 353         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 354                         HvLpEvent_Type_VirtualIo,
 355                         viomajorsubtype_cdio | viocdread,
 356                         HvLpEvent_AckInd_DoAck,
 357                         HvLpEvent_AckType_ImmediateAck,
 358                         viopath_sourceinst(viopath_hostLp),
 359                         viopath_targetinst(viopath_hostLp),
 360                         (u64)req, VIOVERSION << 16,
 361                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 362                         (u64)req->sector * 512, len, 0);
 363         if (hvrc != HvLpEvent_Rc_Good) {
 364                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 365                 return -1;
 366         }
 367
 368         return 0;
 369 }
 370
 371
 372 static int rwreq;
 373
 374 static void do_viocd_request(request_queue_t *q)
 375 {
 376         struct request *req;
 377
 378         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 379                 if (!blk_fs_request(req))
 380                         end_request(req, 0);
 381                 else if (send_request(req) < 0) {
 382                         printk(VIOCD_KERN_WARNING
 383                                         "unable to send message to OS/400!");
 384                         end_request(req, 0);
 385                 } else
 386                         rwreq++;
 387         }
 388 }
 389
 390 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 391 {
 392         struct viocd_waitevent we;
 393         HvLpEvent_Rc hvrc;
 394         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 395
 396         init_completion(&we.com);
 397
 398         /* Send the open event to OS/400 */
 399         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 400                         HvLpEvent_Type_VirtualIo,
 401                         viomajorsubtype_cdio | viocdcheck,
 402                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 403                         viopath_sourceinst(viopath_hostLp),
 404                         viopath_targetinst(viopath_hostLp),
 405                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 406                         0, 0, 0);
 407         if (hvrc != 0) {
 408                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 409                                 (int)hvrc);
 410                 return -EIO;
 411         }
 412
 413         wait_for_completion(&we.com);
 414
 415         /* Check the return code.  If bad, assume no change */
 416         if (we.rc) {
 417                 const struct vio_error_entry *err =
 418                         vio_lookup_rc(viocd_err_table, we.sub_result);
 419                 printk(VIOCD_KERN_WARNING
 420                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 421                                 we.rc, we.sub_result, err->msg);
 422                 return 0;
 423         }
 424
 425         return we.changed;
 426 }
 427
 428 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 429 {
 430         HvLpEvent_Rc hvrc;
 431         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 432         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 433         u64 flags = !!locking;
 434         struct viocd_waitevent we;
 435
 436         init_completion(&we.com);
 437
 438         /* Send the lockdoor event to OS/400 */
 439         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 440                         HvLpEvent_Type_VirtualIo,
 441                         viomajorsubtype_cdio | viocdlockdoor,
 442                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 443                         viopath_sourceinst(viopath_hostLp),
 444                         viopath_targetinst(viopath_hostLp),
 445                         (u64)&we, VIOVERSION << 16,
 446                         (device_no << 48) | (flags << 32), 0, 0, 0);
 447         if (hvrc != 0) {
 448                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 449                                 (int)hvrc);
 450                 return -EIO;
 451         }
 452
 453         wait_for_completion(&we.com);
 454
 455         if (we.rc != 0)
 456                 return -EIO;
 457         return 0;
 458 }
 459
 460 /* This routine handles incoming CD LP events */
 461 static void vio_handle_cd_event(struct HvLpEvent *event)
 462 {
 463         struct viocdlpevent *bevent;
 464         struct viocd_waitevent *pwe;
 465         struct disk_info *di;
 466         unsigned long flags;
 467         struct request *req;
 468
 469
 470         if (event == NULL)
 471                 /* Notification that a partition went away! */
 472                 return;
 473         /* First, we should NEVER get an int here...only acks */
 474         if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
 475                 printk(VIOCD_KERN_WARNING
 476                                 "Yikes! got an int in viocd event handler!\n");
 477                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
 478                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 479                         HvCallEvent_ackLpEvent(event);
 480                 }
 481         }
 482
 483         bevent = (struct viocdlpevent *)event;
 484
 485         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 486         case viocdopen:
 487                 if (event->xRc == 0) {
 488                         di = &viocd_diskinfo[bevent->disk];
 489                         blk_queue_hardsect_size(viocd_queue,
 490                                         bevent->block_size);
 491                         set_capacity(di->viocd_disk,
 492                                         bevent->media_size *
 493                                         bevent->block_size / 512);
 494                 }
 495                 /* FALLTHROUGH !! */
 496         case viocdgetinfo:
 497         case viocdlockdoor:
 498                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 499 return_complete:
 500                 pwe->rc = event->xRc;
 501                 pwe->sub_result = bevent->sub_result;
 502                 complete(&pwe->com);
 503                 break;
 504
 505         case viocdcheck:
 506                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 507                 pwe->changed = bevent->flags;
 508                 goto return_complete;
 509
 510         case viocdclose:
 511                 break;
 512
 513         case viocdread:
 514                 /*
 515                  * Since this is running in interrupt mode, we need to
 516                  * make sure we're not stepping on any global I/O operations
 517                  */
 518                 di = &viocd_diskinfo[bevent->disk];
 519                 spin_lock_irqsave(&viocd_reqlock, flags);
 520                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 521                                 DMA_FROM_DEVICE);
 522                 req = (struct request *)bevent->event.xCorrelationToken;
 523                 rwreq--;
 524
 525                 if (event->xRc != HvLpEvent_Rc_Good) {
 526                         const struct vio_error_entry *err =
 527                                 vio_lookup_rc(viocd_err_table,
 528                                                 bevent->sub_result);
 529                         printk(VIOCD_KERN_WARNING "request %p failed "
 530                                         "with rc %d:0x%04X: %s\n",
 531                                         req, event->xRc,
 532                                         bevent->sub_result, err->msg);
 533                         end_request(req, 0);
 534                 } else
 535                         end_request(req, 1);
 536
 537                 /* restart handling of incoming requests */
 538                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 539                 blk_run_queue(viocd_queue);
 540                 break;
 541
 542         default:
 543                 printk(VIOCD_KERN_WARNING
 544                                 "message with invalid subtype %0x04X!\n",
 545                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 546                 if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
 547                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 548                         HvCallEvent_ackLpEvent(event);
 549                 }
 550         }
 551 }
 552
 553 static struct cdrom_device_ops viocd_dops = {
 554         .open = viocd_open,
 555         .release = viocd_release,
 556         .media_changed = viocd_media_changed,
 557         .lock_door = viocd_lock_door,
 558         .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
 559 };
 560
 561 static int __init find_capability(const char *type)
 562 {
 563         struct capability_entry *entry;
 564
 565         for(entry = capability_table; entry->type; ++entry)
 566                 if(!strncmp(entry->type, type, 4))
 567                         break;
 568         return entry->capability;
 569 }
 570
 571 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 572 {
 573         struct gendisk *gendisk;
 574         int deviceno;
 575         struct disk_info *d;
 576         struct cdrom_device_info *c;
 577         struct cdrom_info *ci;
 578
 579         deviceno = vdev->unit_address;
 580         if (deviceno >= viocd_numdev)
 581                 return -ENODEV;
 582
 583         d = &viocd_diskinfo[deviceno];
 584         c = &d->viocd_info;
 585         ci = &viocd_unitinfo[deviceno];
 586
 587         c->ops = &viocd_dops;
 588         c->speed = 4;
 589         c->capacity = 1;
 590         c->handle = d;
 591         c->mask = ~find_capability(ci->type);
 592         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 593
 594         if (register_cdrom(c) != 0) {
 595                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 596                                 c->name);
 597                 return 0;
 598         }
 599         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 600                         "type %4.4s, model %3.3s\n",
 601                         c->name, ci->rsrcname, ci->type, ci->model);
 602         gendisk = alloc_disk(1);
 603         if (gendisk == NULL) {
 604                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 605                                 c->name);
 606                 unregister_cdrom(c);
 607                 return 0;
 608         }
 609         gendisk->major = VIOCD_MAJOR;
 610         gendisk->first_minor = deviceno;
 611         strncpy(gendisk->disk_name, c->name,
 612                         sizeof(gendisk->disk_name));
 613         snprintf(gendisk->devfs_name, sizeof(gendisk->devfs_name),
 614                         VIOCD_DEVICE_DEVFS "%d", deviceno);
 615         gendisk->queue = viocd_queue;
 616         gendisk->fops = &viocd_fops;
 617         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 618         set_capacity(gendisk, 0);
 619         gendisk->private_data = d;
 620         d->viocd_disk = gendisk;
 621         d->dev = &vdev->dev;
 622         gendisk->driverfs_dev = d->dev;
 623         add_disk(gendisk);
 624
 625         return 0;
 626 }
 627
 628 static int viocd_remove(struct vio_dev *vdev)
 629 {
 630         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 631
 632         if (unregister_cdrom(&d->viocd_info) != 0)
 633                 printk(VIOCD_KERN_WARNING
 634                                 "Cannot unregister viocd CD-ROM %s!\n",
 635                                 d->viocd_info.name);
 636         del_gendisk(d->viocd_disk);
 637         put_disk(d->viocd_disk);
 638         return 0;
 639 }
 640
 641 /**
 642  * viocd_device_table: Used by vio.c to match devices that we
 643  * support.
 644  */
 645 static struct vio_device_id viocd_device_table[] __devinitdata = {
 646         { "viocd", "" },
 647         { 0, }
 648 };
 649
 650 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 651 static struct vio_driver viocd_driver = {
 652         .name = "viocd",
 653         .id_table = viocd_device_table,
 654         .probe = viocd_probe,
 655         .remove = viocd_remove
 656 };
 657
 658 static int __init viocd_init(void)
 659 {
 660         struct proc_dir_entry *e;
 661         int ret = 0;
 662
 663         if (viopath_hostLp == HvLpIndexInvalid) {
 664                 vio_set_hostlp();
 665                 /* If we don't have a host, bail out */
 666                 if (viopath_hostLp == HvLpIndexInvalid)
 667                         return -ENODEV;
 668         }
 669
 670         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 671                         viopath_hostLp);
 672
 673         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 674                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 675                                 VIOCD_MAJOR, VIOCD_DEVICE);
 676                 return -EIO;
 677         }
 678
 679         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 680                         MAX_CD_REQ + 2);
 681         if (ret) {
 682                 printk(VIOCD_KERN_WARNING
 683                                 "error opening path to host partition %d\n",
 684                                 viopath_hostLp);
 685                 goto out_unregister;
 686         }
 687
 688         /* Initialize our request handler */
 689         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 690
 691         get_viocd_info();
 692         if (viocd_numdev == 0)
 693                 goto out_undo_vio;
 694
 695         spin_lock_init(&viocd_reqlock);
 696         viocd_queue = blk_init_queue(do_viocd_request, &viocd_reqlock);
 697         if (viocd_queue == NULL) {
 698                 ret = -ENOMEM;
 699                 goto out_free_info;
 700         }
 701         blk_queue_max_hw_segments(viocd_queue, 1);
 702         blk_queue_max_phys_segments(viocd_queue, 1);
 703         blk_queue_max_sectors(viocd_queue, 4096 / 512);
 704
 705         ret = vio_register_driver(&viocd_driver);
 706         if (ret)
 707                 goto out_cleanup_queue;
 708
 709         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 710         if (e) {
 711                 e->owner = THIS_MODULE;
 712                 e->proc_fops = &proc_viocd_operations;
 713         }
 714
 715         return 0;
 716
 717 out_cleanup_queue:
 718         blk_cleanup_queue(viocd_queue);
 719 out_free_info:
 720         dma_free_coherent(iSeries_vio_dev,
 721                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 722                         viocd_unitinfo, unitinfo_dmaaddr);
 723 out_undo_vio:
 724         vio_clearHandler(viomajorsubtype_cdio);
 725         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 726 out_unregister:
 727         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 728         return ret;
 729 }
 730
 731 static void __exit viocd_exit(void)
 732 {
 733         remove_proc_entry("iSeries/viocd", NULL);
 734         vio_unregister_driver(&viocd_driver);
 735         blk_cleanup_queue(viocd_queue);
 736         if (viocd_unitinfo != NULL)
 737                 dma_free_coherent(iSeries_vio_dev,
 738                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 739                                 viocd_unitinfo, unitinfo_dmaaddr);
 740         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 741         vio_clearHandler(viomajorsubtype_cdio);
 742         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 743 }
 744
 745 module_init(viocd_init);
 746 module_exit(viocd_exit);
 747 MODULE_LICENSE("GPL");