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/vio.h>
  46 #include <asm/scatterlist.h>
  47 #include <asm/iseries/hv_types.h>
  48 #include <asm/iseries/hv_lp_event.h>
  49 #include <asm/iseries/vio.h>
  50
  51 #define VIOCD_DEVICE                    "iseries/vcd"
  52
  53 #define VIOCD_VERS "1.06"
  54
  55 #define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
  56 #define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
  57
  58 struct viocdlpevent {
  59         struct HvLpEvent        event;
  60         u32                     reserved;
  61         u16                     version;
  62         u16                     sub_result;
  63         u16                     disk;
  64         u16                     flags;
  65         u32                     token;
  66         u64                     offset;         /* On open, max number of disks */
  67         u64                     len;            /* On open, size of the disk */
  68         u32                     block_size;     /* Only set on open */
  69         u32                     media_size;     /* Only set on open */
  70 };
  71
  72 enum viocdsubtype {
  73         viocdopen = 0x0001,
  74         viocdclose = 0x0002,
  75         viocdread = 0x0003,
  76         viocdwrite = 0x0004,
  77         viocdlockdoor = 0x0005,
  78         viocdgetinfo = 0x0006,
  79         viocdcheck = 0x0007
  80 };
  81
  82 /*
  83  * Should probably make this a module parameter....sigh
  84  */
  85 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  86
  87 static const struct vio_error_entry viocd_err_table[] = {
  88         {0x0201, EINVAL, "Invalid Range"},
  89         {0x0202, EINVAL, "Invalid Token"},
  90         {0x0203, EIO, "DMA Error"},
  91         {0x0204, EIO, "Use Error"},
  92         {0x0205, EIO, "Release Error"},
  93         {0x0206, EINVAL, "Invalid CD"},
  94         {0x020C, EROFS, "Read Only Device"},
  95         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  96         {0x020E, EIO, "Optical System Error (Varied Off?)"},
  97         {0x02FF, EIO, "Internal Error"},
  98         {0x3010, EIO, "Changed Volume"},
  99         {0xC100, EIO, "Optical System Error"},
 100         {0x0000, 0, NULL},
 101 };
 102
 103 /*
 104  * This is the structure we use to exchange info between driver and interrupt
 105  * handler
 106  */
 107 struct viocd_waitevent {
 108         struct completion       com;
 109         int                     rc;
 110         u16                     sub_result;
 111         int                     changed;
 112 };
 113
 114 /* this is a lookup table for the true capabilities of a device */
 115 struct capability_entry {
 116         char    *type;
 117         int     capability;
 118 };
 119
 120 static struct capability_entry capability_table[] __initdata = {
 121         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 122         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 123         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 124         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_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 spinlock_t viocd_reqlock;
 155
 156 #define MAX_CD_REQ      1
 157
 158 /* procfs support */
 159 static int proc_viocd_show(struct seq_file *m, void *v)
 160 {
 161         int i;
 162
 163         for (i = 0; i < viocd_numdev; i++) {
 164                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 165                                 "type %4.4s, model %3.3s\n",
 166                                 i, viocd_unitinfo[i].rsrcname,
 167                                 viocd_unitinfo[i].type,
 168                                 viocd_unitinfo[i].model);
 169         }
 170         return 0;
 171 }
 172
 173 static int proc_viocd_open(struct inode *inode, struct file *file)
 174 {
 175         return single_open(file, proc_viocd_show, NULL);
 176 }
 177
 178 static struct file_operations proc_viocd_operations = {
 179         .open           = proc_viocd_open,
 180         .read           = seq_read,
 181         .llseek         = seq_lseek,
 182         .release        = single_release,
 183 };
 184
 185 static int viocd_blk_open(struct inode *inode, struct file *file)
 186 {
 187         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 188         return cdrom_open(&di->viocd_info, inode, file);
 189 }
 190
 191 static int viocd_blk_release(struct inode *inode, struct file *file)
 192 {
 193         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 194         return cdrom_release(&di->viocd_info, file);
 195 }
 196
 197 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 198                 unsigned cmd, unsigned long arg)
 199 {
 200         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 201         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
 202 }
 203
 204 static int viocd_blk_media_changed(struct gendisk *disk)
 205 {
 206         struct disk_info *di = disk->private_data;
 207         return cdrom_media_changed(&di->viocd_info);
 208 }
 209
 210 struct block_device_operations viocd_fops = {
 211         .owner =                THIS_MODULE,
 212         .open =                 viocd_blk_open,
 213         .release =              viocd_blk_release,
 214         .ioctl =                viocd_blk_ioctl,
 215         .media_changed =        viocd_blk_media_changed,
 216 };
 217
 218 /* Get info on CD devices from OS/400 */
 219 static void __init get_viocd_info(void)
 220 {
 221         HvLpEvent_Rc hvrc;
 222         int i;
 223         struct viocd_waitevent we;
 224
 225         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
 226                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 227                         &unitinfo_dmaaddr, GFP_ATOMIC);
 228         if (viocd_unitinfo == NULL) {
 229                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
 230                 return;
 231         }
 232
 233         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
 234
 235         init_completion(&we.com);
 236
 237         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 238                         HvLpEvent_Type_VirtualIo,
 239                         viomajorsubtype_cdio | viocdgetinfo,
 240                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 241                         viopath_sourceinst(viopath_hostLp),
 242                         viopath_targetinst(viopath_hostLp),
 243                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
 244                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
 245         if (hvrc != HvLpEvent_Rc_Good) {
 246                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
 247                                 (int)hvrc);
 248                 goto error_ret;
 249         }
 250
 251         wait_for_completion(&we.com);
 252
 253         if (we.rc) {
 254                 const struct vio_error_entry *err =
 255                         vio_lookup_rc(viocd_err_table, we.sub_result);
 256                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
 257                                 we.rc, we.sub_result, err->msg);
 258                 goto error_ret;
 259         }
 260
 261         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
 262                 viocd_numdev++;
 263
 264 error_ret:
 265         if (viocd_numdev == 0) {
 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
 273 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 274 {
 275         struct disk_info *diskinfo = cdi->handle;
 276         int device_no = DEVICE_NR(diskinfo);
 277         HvLpEvent_Rc hvrc;
 278         struct viocd_waitevent we;
 279
 280         init_completion(&we.com);
 281         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 282                         HvLpEvent_Type_VirtualIo,
 283                         viomajorsubtype_cdio | viocdopen,
 284                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 285                         viopath_sourceinst(viopath_hostLp),
 286                         viopath_targetinst(viopath_hostLp),
 287                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 288                         0, 0, 0);
 289         if (hvrc != 0) {
 290                 printk(VIOCD_KERN_WARNING
 291                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 292                                 (int)hvrc);
 293                 return -EIO;
 294         }
 295
 296         wait_for_completion(&we.com);
 297
 298         if (we.rc) {
 299                 const struct vio_error_entry *err =
 300                         vio_lookup_rc(viocd_err_table, we.sub_result);
 301                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 302                                 we.rc, we.sub_result, err->msg);
 303                 return -err->errno;
 304         }
 305
 306         return 0;
 307 }
 308
 309 static void viocd_release(struct cdrom_device_info *cdi)
 310 {
 311         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 312         HvLpEvent_Rc hvrc;
 313
 314         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 315                         HvLpEvent_Type_VirtualIo,
 316                         viomajorsubtype_cdio | viocdclose,
 317                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 318                         viopath_sourceinst(viopath_hostLp),
 319                         viopath_targetinst(viopath_hostLp), 0,
 320                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 321         if (hvrc != 0)
 322                 printk(VIOCD_KERN_WARNING
 323                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 324                                 (int)hvrc);
 325 }
 326
 327 /* Send a read or write request to OS/400 */
 328 static int send_request(struct request *req)
 329 {
 330         HvLpEvent_Rc hvrc;
 331         struct disk_info *diskinfo = req->rq_disk->private_data;
 332         u64 len;
 333         dma_addr_t dmaaddr;
 334         int direction;
 335         u16 cmd;
 336         struct scatterlist sg;
 337
 338         BUG_ON(req->nr_phys_segments > 1);
 339
 340         if (rq_data_dir(req) == READ) {
 341                 direction = DMA_FROM_DEVICE;
 342                 cmd = viomajorsubtype_cdio | viocdread;
 343         } else {
 344                 direction = DMA_TO_DEVICE;
 345                 cmd = viomajorsubtype_cdio | viocdwrite;
 346         }
 347
 348         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 349                 printk(VIOCD_KERN_WARNING
 350                                 "error setting up scatter/gather list\n");
 351                 return -1;
 352         }
 353
 354         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 355                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 356                 return -1;
 357         }
 358         dmaaddr = sg_dma_address(&sg);
 359         len = sg_dma_len(&sg);
 360
 361         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 362                         HvLpEvent_Type_VirtualIo, cmd,
 363                         HvLpEvent_AckInd_DoAck,
 364                         HvLpEvent_AckType_ImmediateAck,
 365                         viopath_sourceinst(viopath_hostLp),
 366                         viopath_targetinst(viopath_hostLp),
 367                         (u64)req, VIOVERSION << 16,
 368                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 369                         (u64)req->sector * 512, len, 0);
 370         if (hvrc != HvLpEvent_Rc_Good) {
 371                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 372                 return -1;
 373         }
 374
 375         return 0;
 376 }
 377
 378
 379 static int rwreq;
 380
 381 static void do_viocd_request(request_queue_t *q)
 382 {
 383         struct request *req;
 384
 385         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 386                 if (!blk_fs_request(req))
 387                         end_request(req, 0);
 388                 else if (send_request(req) < 0) {
 389                         printk(VIOCD_KERN_WARNING
 390                                         "unable to send message to OS/400!");
 391                         end_request(req, 0);
 392                 } else
 393                         rwreq++;
 394         }
 395 }
 396
 397 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 398 {
 399         struct viocd_waitevent we;
 400         HvLpEvent_Rc hvrc;
 401         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 402
 403         init_completion(&we.com);
 404
 405         /* Send the open event to OS/400 */
 406         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 407                         HvLpEvent_Type_VirtualIo,
 408                         viomajorsubtype_cdio | viocdcheck,
 409                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 410                         viopath_sourceinst(viopath_hostLp),
 411                         viopath_targetinst(viopath_hostLp),
 412                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 413                         0, 0, 0);
 414         if (hvrc != 0) {
 415                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 416                                 (int)hvrc);
 417                 return -EIO;
 418         }
 419
 420         wait_for_completion(&we.com);
 421
 422         /* Check the return code.  If bad, assume no change */
 423         if (we.rc) {
 424                 const struct vio_error_entry *err =
 425                         vio_lookup_rc(viocd_err_table, we.sub_result);
 426                 printk(VIOCD_KERN_WARNING
 427                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 428                                 we.rc, we.sub_result, err->msg);
 429                 return 0;
 430         }
 431
 432         return we.changed;
 433 }
 434
 435 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 436 {
 437         HvLpEvent_Rc hvrc;
 438         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 439         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 440         u64 flags = !!locking;
 441         struct viocd_waitevent we;
 442
 443         init_completion(&we.com);
 444
 445         /* Send the lockdoor event to OS/400 */
 446         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 447                         HvLpEvent_Type_VirtualIo,
 448                         viomajorsubtype_cdio | viocdlockdoor,
 449                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 450                         viopath_sourceinst(viopath_hostLp),
 451                         viopath_targetinst(viopath_hostLp),
 452                         (u64)&we, VIOVERSION << 16,
 453                         (device_no << 48) | (flags << 32), 0, 0, 0);
 454         if (hvrc != 0) {
 455                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 456                                 (int)hvrc);
 457                 return -EIO;
 458         }
 459
 460         wait_for_completion(&we.com);
 461
 462         if (we.rc != 0)
 463                 return -EIO;
 464         return 0;
 465 }
 466
 467 static int viocd_packet(struct cdrom_device_info *cdi,
 468                 struct packet_command *cgc)
 469 {
 470         unsigned int buflen = cgc->buflen;
 471         int ret = -EIO;
 472
 473         switch (cgc->cmd[0]) {
 474         case GPCMD_READ_DISC_INFO:
 475                 {
 476                         disc_information *di = (disc_information *)cgc->buffer;
 477
 478                         if (buflen >= 2) {
 479                                 di->disc_information_length = cpu_to_be16(1);
 480                                 ret = 0;
 481                         }
 482                         if (buflen >= 3)
 483                                 di->erasable =
 484                                         (cdi->ops->capability & ~cdi->mask
 485                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 486                 }
 487                 break;
 488         case GPCMD_GET_CONFIGURATION:
 489                 if (cgc->cmd[3] == CDF_RWRT) {
 490                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 491
 492                         if ((buflen >=
 493                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 494                             (cdi->ops->capability & ~cdi->mask
 495                              & (CDC_DVD_RAM | CDC_RAM))) {
 496                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 497                                 rfd->curr = 1;
 498                                 ret = 0;
 499                         }
 500                 }
 501                 break;
 502         default:
 503                 if (cgc->sense) {
 504                         /* indicate Unknown code */
 505                         cgc->sense->sense_key = 0x05;
 506                         cgc->sense->asc = 0x20;
 507                         cgc->sense->ascq = 0x00;
 508                 }
 509                 break;
 510         }
 511
 512         cgc->stat = ret;
 513         return ret;
 514 }
 515
 516 static void restart_all_queues(int first_index)
 517 {
 518         int i;
 519
 520         for (i = first_index + 1; i < viocd_numdev; i++)
 521                 if (viocd_diskinfo[i].viocd_disk)
 522                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 523         for (i = 0; i <= first_index; i++)
 524                 if (viocd_diskinfo[i].viocd_disk)
 525                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 526 }
 527
 528 /* This routine handles incoming CD LP events */
 529 static void vio_handle_cd_event(struct HvLpEvent *event)
 530 {
 531         struct viocdlpevent *bevent;
 532         struct viocd_waitevent *pwe;
 533         struct disk_info *di;
 534         unsigned long flags;
 535         struct request *req;
 536
 537
 538         if (event == NULL)
 539                 /* Notification that a partition went away! */
 540                 return;
 541         /* First, we should NEVER get an int here...only acks */
 542         if (hvlpevent_is_int(event)) {
 543                 printk(VIOCD_KERN_WARNING
 544                                 "Yikes! got an int in viocd event handler!\n");
 545                 if (hvlpevent_need_ack(event)) {
 546                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 547                         HvCallEvent_ackLpEvent(event);
 548                 }
 549         }
 550
 551         bevent = (struct viocdlpevent *)event;
 552
 553         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 554         case viocdopen:
 555                 if (event->xRc == 0) {
 556                         di = &viocd_diskinfo[bevent->disk];
 557                         blk_queue_hardsect_size(di->viocd_disk->queue,
 558                                         bevent->block_size);
 559                         set_capacity(di->viocd_disk,
 560                                         bevent->media_size *
 561                                         bevent->block_size / 512);
 562                 }
 563                 /* FALLTHROUGH !! */
 564         case viocdgetinfo:
 565         case viocdlockdoor:
 566                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 567 return_complete:
 568                 pwe->rc = event->xRc;
 569                 pwe->sub_result = bevent->sub_result;
 570                 complete(&pwe->com);
 571                 break;
 572
 573         case viocdcheck:
 574                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 575                 pwe->changed = bevent->flags;
 576                 goto return_complete;
 577
 578         case viocdclose:
 579                 break;
 580
 581         case viocdwrite:
 582         case viocdread:
 583                 /*
 584                  * Since this is running in interrupt mode, we need to
 585                  * make sure we're not stepping on any global I/O operations
 586                  */
 587                 di = &viocd_diskinfo[bevent->disk];
 588                 spin_lock_irqsave(&viocd_reqlock, flags);
 589                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 590                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 591                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 592                 req = (struct request *)bevent->event.xCorrelationToken;
 593                 rwreq--;
 594
 595                 if (event->xRc != HvLpEvent_Rc_Good) {
 596                         const struct vio_error_entry *err =
 597                                 vio_lookup_rc(viocd_err_table,
 598                                                 bevent->sub_result);
 599                         printk(VIOCD_KERN_WARNING "request %p failed "
 600                                         "with rc %d:0x%04X: %s\n",
 601                                         req, event->xRc,
 602                                         bevent->sub_result, err->msg);
 603                         end_request(req, 0);
 604                 } else
 605                         end_request(req, 1);
 606
 607                 /* restart handling of incoming requests */
 608                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 609                 restart_all_queues(bevent->disk);
 610                 break;
 611
 612         default:
 613                 printk(VIOCD_KERN_WARNING
 614                                 "message with invalid subtype %0x04X!\n",
 615                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 616                 if (hvlpevent_need_ack(event)) {
 617                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 618                         HvCallEvent_ackLpEvent(event);
 619                 }
 620         }
 621 }
 622
 623 static struct cdrom_device_ops viocd_dops = {
 624         .open = viocd_open,
 625         .release = viocd_release,
 626         .media_changed = viocd_media_changed,
 627         .lock_door = viocd_lock_door,
 628         .generic_packet = viocd_packet,
 629         .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
 630 };
 631
 632 static int __init find_capability(const char *type)
 633 {
 634         struct capability_entry *entry;
 635
 636         for(entry = capability_table; entry->type; ++entry)
 637                 if(!strncmp(entry->type, type, 4))
 638                         break;
 639         return entry->capability;
 640 }
 641
 642 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 643 {
 644         struct gendisk *gendisk;
 645         int deviceno;
 646         struct disk_info *d;
 647         struct cdrom_device_info *c;
 648         struct cdrom_info *ci;
 649         struct request_queue *q;
 650
 651         deviceno = vdev->unit_address;
 652         if (deviceno >= viocd_numdev)
 653                 return -ENODEV;
 654
 655         d = &viocd_diskinfo[deviceno];
 656         c = &d->viocd_info;
 657         ci = &viocd_unitinfo[deviceno];
 658
 659         c->ops = &viocd_dops;
 660         c->speed = 4;
 661         c->capacity = 1;
 662         c->handle = d;
 663         c->mask = ~find_capability(ci->type);
 664         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 665
 666         if (register_cdrom(c) != 0) {
 667                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 668                                 c->name);
 669                 goto out;
 670         }
 671         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 672                         "type %4.4s, model %3.3s\n",
 673                         c->name, ci->rsrcname, ci->type, ci->model);
 674         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 675         if (q == NULL) {
 676                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
 677                                 c->name);
 678                 goto out_unregister_cdrom;
 679         }
 680         gendisk = alloc_disk(1);
 681         if (gendisk == NULL) {
 682                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 683                                 c->name);
 684                 goto out_cleanup_queue;
 685         }
 686         gendisk->major = VIOCD_MAJOR;
 687         gendisk->first_minor = deviceno;
 688         strncpy(gendisk->disk_name, c->name,
 689                         sizeof(gendisk->disk_name));
 690         blk_queue_max_hw_segments(q, 1);
 691         blk_queue_max_phys_segments(q, 1);
 692         blk_queue_max_sectors(q, 4096 / 512);
 693         gendisk->queue = q;
 694         gendisk->fops = &viocd_fops;
 695         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 696         set_capacity(gendisk, 0);
 697         gendisk->private_data = d;
 698         d->viocd_disk = gendisk;
 699         d->dev = &vdev->dev;
 700         gendisk->driverfs_dev = d->dev;
 701         add_disk(gendisk);
 702         return 0;
 703
 704 out_cleanup_queue:
 705         blk_cleanup_queue(q);
 706 out_unregister_cdrom:
 707         unregister_cdrom(c);
 708 out:
 709         return -ENODEV;
 710 }
 711
 712 static int viocd_remove(struct vio_dev *vdev)
 713 {
 714         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 715
 716         if (unregister_cdrom(&d->viocd_info) != 0)
 717                 printk(VIOCD_KERN_WARNING
 718                                 "Cannot unregister viocd CD-ROM %s!\n",
 719                                 d->viocd_info.name);
 720         del_gendisk(d->viocd_disk);
 721         blk_cleanup_queue(d->viocd_disk->queue);
 722         put_disk(d->viocd_disk);
 723         return 0;
 724 }
 725
 726 /**
 727  * viocd_device_table: Used by vio.c to match devices that we
 728  * support.
 729  */
 730 static struct vio_device_id viocd_device_table[] __devinitdata = {
 731         { "block", "IBM,iSeries-viocd" },
 732         { "", "" }
 733 };
 734 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 735
 736 static struct vio_driver viocd_driver = {
 737         .id_table = viocd_device_table,
 738         .probe = viocd_probe,
 739         .remove = viocd_remove,
 740         .driver = {
 741                 .name = "viocd",
 742                 .owner = THIS_MODULE,
 743         }
 744 };
 745
 746 static int __init viocd_init(void)
 747 {
 748         struct proc_dir_entry *e;
 749         int ret = 0;
 750
 751         if (viopath_hostLp == HvLpIndexInvalid) {
 752                 vio_set_hostlp();
 753                 /* If we don't have a host, bail out */
 754                 if (viopath_hostLp == HvLpIndexInvalid)
 755                         return -ENODEV;
 756         }
 757
 758         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 759                         viopath_hostLp);
 760
 761         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 762                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 763                                 VIOCD_MAJOR, VIOCD_DEVICE);
 764                 return -EIO;
 765         }
 766
 767         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 768                         MAX_CD_REQ + 2);
 769         if (ret) {
 770                 printk(VIOCD_KERN_WARNING
 771                                 "error opening path to host partition %d\n",
 772                                 viopath_hostLp);
 773                 goto out_unregister;
 774         }
 775
 776         /* Initialize our request handler */
 777         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 778
 779         get_viocd_info();
 780
 781         spin_lock_init(&viocd_reqlock);
 782
 783         ret = vio_register_driver(&viocd_driver);
 784         if (ret)
 785                 goto out_free_info;
 786
 787         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 788         if (e) {
 789                 e->owner = THIS_MODULE;
 790                 e->proc_fops = &proc_viocd_operations;
 791         }
 792
 793         return 0;
 794
 795 out_free_info:
 796         dma_free_coherent(iSeries_vio_dev,
 797                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 798                         viocd_unitinfo, unitinfo_dmaaddr);
 799         vio_clearHandler(viomajorsubtype_cdio);
 800         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 801 out_unregister:
 802         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 803         return ret;
 804 }
 805
 806 static void __exit viocd_exit(void)
 807 {
 808         remove_proc_entry("iSeries/viocd", NULL);
 809         vio_unregister_driver(&viocd_driver);
 810         if (viocd_unitinfo != NULL)
 811                 dma_free_coherent(iSeries_vio_dev,
 812                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 813                                 viocd_unitinfo, unitinfo_dmaaddr);
 814         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 815         vio_clearHandler(viomajorsubtype_cdio);
 816         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 817 }
 818
 819 module_init(viocd_init);
 820 module_exit(viocd_exit);
 821 MODULE_LICENSE("GPL");