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 #include <asm/firmware.h>
  51
  52 #define VIOCD_DEVICE                    "iseries/vcd"
  53
  54 #define VIOCD_VERS "1.06"
  55
  56 #define VIOCD_KERN_WARNING              KERN_WARNING "viocd: "
  57 #define VIOCD_KERN_INFO                 KERN_INFO "viocd: "
  58
  59 struct viocdlpevent {
  60         struct HvLpEvent        event;
  61         u32                     reserved;
  62         u16                     version;
  63         u16                     sub_result;
  64         u16                     disk;
  65         u16                     flags;
  66         u32                     token;
  67         u64                     offset;         /* On open, max number of disks */
  68         u64                     len;            /* On open, size of the disk */
  69         u32                     block_size;     /* Only set on open */
  70         u32                     media_size;     /* Only set on open */
  71 };
  72
  73 enum viocdsubtype {
  74         viocdopen = 0x0001,
  75         viocdclose = 0x0002,
  76         viocdread = 0x0003,
  77         viocdwrite = 0x0004,
  78         viocdlockdoor = 0x0005,
  79         viocdgetinfo = 0x0006,
  80         viocdcheck = 0x0007
  81 };
  82
  83 /*
  84  * Should probably make this a module parameter....sigh
  85  */
  86 #define VIOCD_MAX_CD    HVMAXARCHITECTEDVIRTUALCDROMS
  87
  88 static const struct vio_error_entry viocd_err_table[] = {
  89         {0x0201, EINVAL, "Invalid Range"},
  90         {0x0202, EINVAL, "Invalid Token"},
  91         {0x0203, EIO, "DMA Error"},
  92         {0x0204, EIO, "Use Error"},
  93         {0x0205, EIO, "Release Error"},
  94         {0x0206, EINVAL, "Invalid CD"},
  95         {0x020C, EROFS, "Read Only Device"},
  96         {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
  97         {0x020E, EIO, "Optical System Error (Varied Off?)"},
  98         {0x02FF, EIO, "Internal Error"},
  99         {0x3010, EIO, "Changed Volume"},
 100         {0xC100, EIO, "Optical System Error"},
 101         {0x0000, 0, NULL},
 102 };
 103
 104 /*
 105  * This is the structure we use to exchange info between driver and interrupt
 106  * handler
 107  */
 108 struct viocd_waitevent {
 109         struct completion       com;
 110         int                     rc;
 111         u16                     sub_result;
 112         int                     changed;
 113 };
 114
 115 /* this is a lookup table for the true capabilities of a device */
 116 struct capability_entry {
 117         char    *type;
 118         int     capability;
 119 };
 120
 121 static struct capability_entry capability_table[] __initdata = {
 122         { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 123         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 124         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 125         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 126         { "6321", CDC_LOCK },
 127         { "632B", 0 },
 128         { NULL  , CDC_LOCK },
 129 };
 130
 131 /* These are our internal structures for keeping track of devices */
 132 static int viocd_numdev;
 133
 134 struct cdrom_info {
 135         char    rsrcname[10];
 136         char    type[4];
 137         char    model[3];
 138 };
 139 /*
 140  * This needs to be allocated since it is passed to the
 141  * Hypervisor and we may be a module.
 142  */
 143 static struct cdrom_info *viocd_unitinfo;
 144 static dma_addr_t unitinfo_dmaaddr;
 145
 146 struct disk_info {
 147         struct gendisk                  *viocd_disk;
 148         struct cdrom_device_info        viocd_info;
 149         struct device                   *dev;
 150 };
 151 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 152
 153 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 154
 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 const 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         int direction;
 336         u16 cmd;
 337         struct scatterlist sg;
 338
 339         BUG_ON(req->nr_phys_segments > 1);
 340
 341         if (rq_data_dir(req) == READ) {
 342                 direction = DMA_FROM_DEVICE;
 343                 cmd = viomajorsubtype_cdio | viocdread;
 344         } else {
 345                 direction = DMA_TO_DEVICE;
 346                 cmd = viomajorsubtype_cdio | viocdwrite;
 347         }
 348
 349         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 350                 printk(VIOCD_KERN_WARNING
 351                                 "error setting up scatter/gather list\n");
 352                 return -1;
 353         }
 354
 355         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 356                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 357                 return -1;
 358         }
 359         dmaaddr = sg_dma_address(&sg);
 360         len = sg_dma_len(&sg);
 361
 362         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 363                         HvLpEvent_Type_VirtualIo, cmd,
 364                         HvLpEvent_AckInd_DoAck,
 365                         HvLpEvent_AckType_ImmediateAck,
 366                         viopath_sourceinst(viopath_hostLp),
 367                         viopath_targetinst(viopath_hostLp),
 368                         (u64)req, VIOVERSION << 16,
 369                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 370                         (u64)req->sector * 512, len, 0);
 371         if (hvrc != HvLpEvent_Rc_Good) {
 372                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 373                 return -1;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static void viocd_end_request(struct request *req, int uptodate)
 380 {
 381         int nsectors = req->hard_nr_sectors;
 382
 383         /*
 384          * Make sure it's fully ended, and ensure that we process
 385          * at least one sector.
 386          */
 387         if (blk_pc_request(req))
 388                 nsectors = (req->data_len + 511) >> 9;
 389         if (!nsectors)
 390                 nsectors = 1;
 391
 392         if (end_that_request_first(req, uptodate, nsectors))
 393                 BUG();
 394         add_disk_randomness(req->rq_disk);
 395         blkdev_dequeue_request(req);
 396         end_that_request_last(req, uptodate);
 397 }
 398
 399 static int rwreq;
 400
 401 static void do_viocd_request(struct request_queue *q)
 402 {
 403         struct request *req;
 404
 405         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 406                 if (!blk_fs_request(req))
 407                         viocd_end_request(req, 0);
 408                 else if (send_request(req) < 0) {
 409                         printk(VIOCD_KERN_WARNING
 410                                         "unable to send message to OS/400!");
 411                         viocd_end_request(req, 0);
 412                 } else
 413                         rwreq++;
 414         }
 415 }
 416
 417 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 418 {
 419         struct viocd_waitevent we;
 420         HvLpEvent_Rc hvrc;
 421         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 422
 423         init_completion(&we.com);
 424
 425         /* Send the open event to OS/400 */
 426         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 427                         HvLpEvent_Type_VirtualIo,
 428                         viomajorsubtype_cdio | viocdcheck,
 429                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 430                         viopath_sourceinst(viopath_hostLp),
 431                         viopath_targetinst(viopath_hostLp),
 432                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 433                         0, 0, 0);
 434         if (hvrc != 0) {
 435                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 436                                 (int)hvrc);
 437                 return -EIO;
 438         }
 439
 440         wait_for_completion(&we.com);
 441
 442         /* Check the return code.  If bad, assume no change */
 443         if (we.rc) {
 444                 const struct vio_error_entry *err =
 445                         vio_lookup_rc(viocd_err_table, we.sub_result);
 446                 printk(VIOCD_KERN_WARNING
 447                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 448                                 we.rc, we.sub_result, err->msg);
 449                 return 0;
 450         }
 451
 452         return we.changed;
 453 }
 454
 455 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 456 {
 457         HvLpEvent_Rc hvrc;
 458         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 459         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 460         u64 flags = !!locking;
 461         struct viocd_waitevent we;
 462
 463         init_completion(&we.com);
 464
 465         /* Send the lockdoor event to OS/400 */
 466         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 467                         HvLpEvent_Type_VirtualIo,
 468                         viomajorsubtype_cdio | viocdlockdoor,
 469                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 470                         viopath_sourceinst(viopath_hostLp),
 471                         viopath_targetinst(viopath_hostLp),
 472                         (u64)&we, VIOVERSION << 16,
 473                         (device_no << 48) | (flags << 32), 0, 0, 0);
 474         if (hvrc != 0) {
 475                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 476                                 (int)hvrc);
 477                 return -EIO;
 478         }
 479
 480         wait_for_completion(&we.com);
 481
 482         if (we.rc != 0)
 483                 return -EIO;
 484         return 0;
 485 }
 486
 487 static int viocd_packet(struct cdrom_device_info *cdi,
 488                 struct packet_command *cgc)
 489 {
 490         unsigned int buflen = cgc->buflen;
 491         int ret = -EIO;
 492
 493         switch (cgc->cmd[0]) {
 494         case GPCMD_READ_DISC_INFO:
 495                 {
 496                         disc_information *di = (disc_information *)cgc->buffer;
 497
 498                         if (buflen >= 2) {
 499                                 di->disc_information_length = cpu_to_be16(1);
 500                                 ret = 0;
 501                         }
 502                         if (buflen >= 3)
 503                                 di->erasable =
 504                                         (cdi->ops->capability & ~cdi->mask
 505                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 506                 }
 507                 break;
 508         case GPCMD_GET_CONFIGURATION:
 509                 if (cgc->cmd[3] == CDF_RWRT) {
 510                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 511
 512                         if ((buflen >=
 513                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 514                             (cdi->ops->capability & ~cdi->mask
 515                              & (CDC_DVD_RAM | CDC_RAM))) {
 516                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 517                                 rfd->curr = 1;
 518                                 ret = 0;
 519                         }
 520                 }
 521                 break;
 522         default:
 523                 if (cgc->sense) {
 524                         /* indicate Unknown code */
 525                         cgc->sense->sense_key = 0x05;
 526                         cgc->sense->asc = 0x20;
 527                         cgc->sense->ascq = 0x00;
 528                 }
 529                 break;
 530         }
 531
 532         cgc->stat = ret;
 533         return ret;
 534 }
 535
 536 static void restart_all_queues(int first_index)
 537 {
 538         int i;
 539
 540         for (i = first_index + 1; i < viocd_numdev; i++)
 541                 if (viocd_diskinfo[i].viocd_disk)
 542                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 543         for (i = 0; i <= first_index; i++)
 544                 if (viocd_diskinfo[i].viocd_disk)
 545                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 546 }
 547
 548 /* This routine handles incoming CD LP events */
 549 static void vio_handle_cd_event(struct HvLpEvent *event)
 550 {
 551         struct viocdlpevent *bevent;
 552         struct viocd_waitevent *pwe;
 553         struct disk_info *di;
 554         unsigned long flags;
 555         struct request *req;
 556
 557
 558         if (event == NULL)
 559                 /* Notification that a partition went away! */
 560                 return;
 561         /* First, we should NEVER get an int here...only acks */
 562         if (hvlpevent_is_int(event)) {
 563                 printk(VIOCD_KERN_WARNING
 564                                 "Yikes! got an int in viocd event handler!\n");
 565                 if (hvlpevent_need_ack(event)) {
 566                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 567                         HvCallEvent_ackLpEvent(event);
 568                 }
 569         }
 570
 571         bevent = (struct viocdlpevent *)event;
 572
 573         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 574         case viocdopen:
 575                 if (event->xRc == 0) {
 576                         di = &viocd_diskinfo[bevent->disk];
 577                         blk_queue_hardsect_size(di->viocd_disk->queue,
 578                                         bevent->block_size);
 579                         set_capacity(di->viocd_disk,
 580                                         bevent->media_size *
 581                                         bevent->block_size / 512);
 582                 }
 583                 /* FALLTHROUGH !! */
 584         case viocdgetinfo:
 585         case viocdlockdoor:
 586                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 587 return_complete:
 588                 pwe->rc = event->xRc;
 589                 pwe->sub_result = bevent->sub_result;
 590                 complete(&pwe->com);
 591                 break;
 592
 593         case viocdcheck:
 594                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 595                 pwe->changed = bevent->flags;
 596                 goto return_complete;
 597
 598         case viocdclose:
 599                 break;
 600
 601         case viocdwrite:
 602         case viocdread:
 603                 /*
 604                  * Since this is running in interrupt mode, we need to
 605                  * make sure we're not stepping on any global I/O operations
 606                  */
 607                 di = &viocd_diskinfo[bevent->disk];
 608                 spin_lock_irqsave(&viocd_reqlock, flags);
 609                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 610                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 611                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 612                 req = (struct request *)bevent->event.xCorrelationToken;
 613                 rwreq--;
 614
 615                 if (event->xRc != HvLpEvent_Rc_Good) {
 616                         const struct vio_error_entry *err =
 617                                 vio_lookup_rc(viocd_err_table,
 618                                                 bevent->sub_result);
 619                         printk(VIOCD_KERN_WARNING "request %p failed "
 620                                         "with rc %d:0x%04X: %s\n",
 621                                         req, event->xRc,
 622                                         bevent->sub_result, err->msg);
 623                         viocd_end_request(req, 0);
 624                 } else
 625                         viocd_end_request(req, 1);
 626
 627                 /* restart handling of incoming requests */
 628                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 629                 restart_all_queues(bevent->disk);
 630                 break;
 631
 632         default:
 633                 printk(VIOCD_KERN_WARNING
 634                                 "message with invalid subtype %0x04X!\n",
 635                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 636                 if (hvlpevent_need_ack(event)) {
 637                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 638                         HvCallEvent_ackLpEvent(event);
 639                 }
 640         }
 641 }
 642
 643 static struct cdrom_device_ops viocd_dops = {
 644         .open = viocd_open,
 645         .release = viocd_release,
 646         .media_changed = viocd_media_changed,
 647         .lock_door = viocd_lock_door,
 648         .generic_packet = viocd_packet,
 649         .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
 650 };
 651
 652 static int __init find_capability(const char *type)
 653 {
 654         struct capability_entry *entry;
 655
 656         for(entry = capability_table; entry->type; ++entry)
 657                 if(!strncmp(entry->type, type, 4))
 658                         break;
 659         return entry->capability;
 660 }
 661
 662 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 663 {
 664         struct gendisk *gendisk;
 665         int deviceno;
 666         struct disk_info *d;
 667         struct cdrom_device_info *c;
 668         struct cdrom_info *ci;
 669         struct request_queue *q;
 670
 671         deviceno = vdev->unit_address;
 672         if (deviceno >= viocd_numdev)
 673                 return -ENODEV;
 674
 675         d = &viocd_diskinfo[deviceno];
 676         c = &d->viocd_info;
 677         ci = &viocd_unitinfo[deviceno];
 678
 679         c->ops = &viocd_dops;
 680         c->speed = 4;
 681         c->capacity = 1;
 682         c->handle = d;
 683         c->mask = ~find_capability(ci->type);
 684         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 685
 686         if (register_cdrom(c) != 0) {
 687                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 688                                 c->name);
 689                 goto out;
 690         }
 691         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 692                         "type %4.4s, model %3.3s\n",
 693                         c->name, ci->rsrcname, ci->type, ci->model);
 694         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 695         if (q == NULL) {
 696                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
 697                                 c->name);
 698                 goto out_unregister_cdrom;
 699         }
 700         gendisk = alloc_disk(1);
 701         if (gendisk == NULL) {
 702                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 703                                 c->name);
 704                 goto out_cleanup_queue;
 705         }
 706         gendisk->major = VIOCD_MAJOR;
 707         gendisk->first_minor = deviceno;
 708         strncpy(gendisk->disk_name, c->name,
 709                         sizeof(gendisk->disk_name));
 710         blk_queue_max_hw_segments(q, 1);
 711         blk_queue_max_phys_segments(q, 1);
 712         blk_queue_max_sectors(q, 4096 / 512);
 713         gendisk->queue = q;
 714         gendisk->fops = &viocd_fops;
 715         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 716         set_capacity(gendisk, 0);
 717         gendisk->private_data = d;
 718         d->viocd_disk = gendisk;
 719         d->dev = &vdev->dev;
 720         gendisk->driverfs_dev = d->dev;
 721         add_disk(gendisk);
 722         return 0;
 723
 724 out_cleanup_queue:
 725         blk_cleanup_queue(q);
 726 out_unregister_cdrom:
 727         unregister_cdrom(c);
 728 out:
 729         return -ENODEV;
 730 }
 731
 732 static int viocd_remove(struct vio_dev *vdev)
 733 {
 734         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 735
 736         if (unregister_cdrom(&d->viocd_info) != 0)
 737                 printk(VIOCD_KERN_WARNING
 738                                 "Cannot unregister viocd CD-ROM %s!\n",
 739                                 d->viocd_info.name);
 740         del_gendisk(d->viocd_disk);
 741         blk_cleanup_queue(d->viocd_disk->queue);
 742         put_disk(d->viocd_disk);
 743         return 0;
 744 }
 745
 746 /**
 747  * viocd_device_table: Used by vio.c to match devices that we
 748  * support.
 749  */
 750 static struct vio_device_id viocd_device_table[] __devinitdata = {
 751         { "block", "IBM,iSeries-viocd" },
 752         { "", "" }
 753 };
 754 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 755
 756 static struct vio_driver viocd_driver = {
 757         .id_table = viocd_device_table,
 758         .probe = viocd_probe,
 759         .remove = viocd_remove,
 760         .driver = {
 761                 .name = "viocd",
 762                 .owner = THIS_MODULE,
 763         }
 764 };
 765
 766 static int __init viocd_init(void)
 767 {
 768         struct proc_dir_entry *e;
 769         int ret = 0;
 770
 771         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 772                 return -ENODEV;
 773
 774         if (viopath_hostLp == HvLpIndexInvalid) {
 775                 vio_set_hostlp();
 776                 /* If we don't have a host, bail out */
 777                 if (viopath_hostLp == HvLpIndexInvalid)
 778                         return -ENODEV;
 779         }
 780
 781         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 782                         viopath_hostLp);
 783
 784         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 785                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 786                                 VIOCD_MAJOR, VIOCD_DEVICE);
 787                 return -EIO;
 788         }
 789
 790         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 791                         MAX_CD_REQ + 2);
 792         if (ret) {
 793                 printk(VIOCD_KERN_WARNING
 794                                 "error opening path to host partition %d\n",
 795                                 viopath_hostLp);
 796                 goto out_unregister;
 797         }
 798
 799         /* Initialize our request handler */
 800         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 801
 802         get_viocd_info();
 803
 804         spin_lock_init(&viocd_reqlock);
 805
 806         ret = vio_register_driver(&viocd_driver);
 807         if (ret)
 808                 goto out_free_info;
 809
 810         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 811         if (e) {
 812                 e->owner = THIS_MODULE;
 813                 e->proc_fops = &proc_viocd_operations;
 814         }
 815
 816         return 0;
 817
 818 out_free_info:
 819         dma_free_coherent(iSeries_vio_dev,
 820                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 821                         viocd_unitinfo, unitinfo_dmaaddr);
 822         vio_clearHandler(viomajorsubtype_cdio);
 823         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 824 out_unregister:
 825         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 826         return ret;
 827 }
 828
 829 static void __exit viocd_exit(void)
 830 {
 831         remove_proc_entry("iSeries/viocd", NULL);
 832         vio_unregister_driver(&viocd_driver);
 833         if (viocd_unitinfo != NULL)
 834                 dma_free_coherent(iSeries_vio_dev,
 835                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 836                                 viocd_unitinfo, unitinfo_dmaaddr);
 837         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 838         vio_clearHandler(viomajorsubtype_cdio);
 839         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 840 }
 841
 842 module_init(viocd_init);
 843 module_exit(viocd_exit);
 844 MODULE_LICENSE("GPL");