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/hv_types.h>
  50 #include <asm/iseries/hv_lp_event.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 | CDC_RAM },
 125         { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 126         { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 127         { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
 128         { "6321", CDC_LOCK },
 129         { "632B", 0 },
 130         { NULL  , CDC_LOCK },
 131 };
 132
 133 /* These are our internal structures for keeping track of devices */
 134 static int viocd_numdev;
 135
 136 struct cdrom_info {
 137         char    rsrcname[10];
 138         char    type[4];
 139         char    model[3];
 140 };
 141 /*
 142  * This needs to be allocated since it is passed to the
 143  * Hypervisor and we may be a module.
 144  */
 145 static struct cdrom_info *viocd_unitinfo;
 146 static dma_addr_t unitinfo_dmaaddr;
 147
 148 struct disk_info {
 149         struct gendisk                  *viocd_disk;
 150         struct cdrom_device_info        viocd_info;
 151         struct device                   *dev;
 152 };
 153 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 154
 155 #define DEVICE_NR(di)   ((di) - &viocd_diskinfo[0])
 156
 157 static spinlock_t viocd_reqlock;
 158
 159 #define MAX_CD_REQ      1
 160
 161 /* procfs support */
 162 static int proc_viocd_show(struct seq_file *m, void *v)
 163 {
 164         int i;
 165
 166         for (i = 0; i < viocd_numdev; i++) {
 167                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
 168                                 "type %4.4s, model %3.3s\n",
 169                                 i, viocd_unitinfo[i].rsrcname,
 170                                 viocd_unitinfo[i].type,
 171                                 viocd_unitinfo[i].model);
 172         }
 173         return 0;
 174 }
 175
 176 static int proc_viocd_open(struct inode *inode, struct file *file)
 177 {
 178         return single_open(file, proc_viocd_show, NULL);
 179 }
 180
 181 static struct file_operations proc_viocd_operations = {
 182         .open           = proc_viocd_open,
 183         .read           = seq_read,
 184         .llseek         = seq_lseek,
 185         .release        = single_release,
 186 };
 187
 188 static int viocd_blk_open(struct inode *inode, struct file *file)
 189 {
 190         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 191         return cdrom_open(&di->viocd_info, inode, file);
 192 }
 193
 194 static int viocd_blk_release(struct inode *inode, struct file *file)
 195 {
 196         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 197         return cdrom_release(&di->viocd_info, file);
 198 }
 199
 200 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
 201                 unsigned cmd, unsigned long arg)
 202 {
 203         struct disk_info *di = inode->i_bdev->bd_disk->private_data;
 204         return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
 205 }
 206
 207 static int viocd_blk_media_changed(struct gendisk *disk)
 208 {
 209         struct disk_info *di = disk->private_data;
 210         return cdrom_media_changed(&di->viocd_info);
 211 }
 212
 213 struct block_device_operations viocd_fops = {
 214         .owner =                THIS_MODULE,
 215         .open =                 viocd_blk_open,
 216         .release =              viocd_blk_release,
 217         .ioctl =                viocd_blk_ioctl,
 218         .media_changed =        viocd_blk_media_changed,
 219 };
 220
 221 /* Get info on CD devices from OS/400 */
 222 static void __init get_viocd_info(void)
 223 {
 224         HvLpEvent_Rc hvrc;
 225         int i;
 226         struct viocd_waitevent we;
 227
 228         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
 229                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 230                         &unitinfo_dmaaddr, GFP_ATOMIC);
 231         if (viocd_unitinfo == NULL) {
 232                 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
 233                 return;
 234         }
 235
 236         memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
 237
 238         init_completion(&we.com);
 239
 240         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 241                         HvLpEvent_Type_VirtualIo,
 242                         viomajorsubtype_cdio | viocdgetinfo,
 243                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 244                         viopath_sourceinst(viopath_hostLp),
 245                         viopath_targetinst(viopath_hostLp),
 246                         (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
 247                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
 248         if (hvrc != HvLpEvent_Rc_Good) {
 249                 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
 250                                 (int)hvrc);
 251                 goto error_ret;
 252         }
 253
 254         wait_for_completion(&we.com);
 255
 256         if (we.rc) {
 257                 const struct vio_error_entry *err =
 258                         vio_lookup_rc(viocd_err_table, we.sub_result);
 259                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
 260                                 we.rc, we.sub_result, err->msg);
 261                 goto error_ret;
 262         }
 263
 264         for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
 265                 viocd_numdev++;
 266
 267 error_ret:
 268         if (viocd_numdev == 0) {
 269                 dma_free_coherent(iSeries_vio_dev,
 270                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 271                                 viocd_unitinfo, unitinfo_dmaaddr);
 272                 viocd_unitinfo = NULL;
 273         }
 274 }
 275
 276 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
 277 {
 278         struct disk_info *diskinfo = cdi->handle;
 279         int device_no = DEVICE_NR(diskinfo);
 280         HvLpEvent_Rc hvrc;
 281         struct viocd_waitevent we;
 282
 283         init_completion(&we.com);
 284         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 285                         HvLpEvent_Type_VirtualIo,
 286                         viomajorsubtype_cdio | viocdopen,
 287                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 288                         viopath_sourceinst(viopath_hostLp),
 289                         viopath_targetinst(viopath_hostLp),
 290                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 291                         0, 0, 0);
 292         if (hvrc != 0) {
 293                 printk(VIOCD_KERN_WARNING
 294                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 295                                 (int)hvrc);
 296                 return -EIO;
 297         }
 298
 299         wait_for_completion(&we.com);
 300
 301         if (we.rc) {
 302                 const struct vio_error_entry *err =
 303                         vio_lookup_rc(viocd_err_table, we.sub_result);
 304                 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
 305                                 we.rc, we.sub_result, err->msg);
 306                 return -err->errno;
 307         }
 308
 309         return 0;
 310 }
 311
 312 static void viocd_release(struct cdrom_device_info *cdi)
 313 {
 314         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 315         HvLpEvent_Rc hvrc;
 316
 317         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 318                         HvLpEvent_Type_VirtualIo,
 319                         viomajorsubtype_cdio | viocdclose,
 320                         HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
 321                         viopath_sourceinst(viopath_hostLp),
 322                         viopath_targetinst(viopath_hostLp), 0,
 323                         VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
 324         if (hvrc != 0)
 325                 printk(VIOCD_KERN_WARNING
 326                                 "bad rc on HvCallEvent_signalLpEventFast %d\n",
 327                                 (int)hvrc);
 328 }
 329
 330 /* Send a read or write request to OS/400 */
 331 static int send_request(struct request *req)
 332 {
 333         HvLpEvent_Rc hvrc;
 334         struct disk_info *diskinfo = req->rq_disk->private_data;
 335         u64 len;
 336         dma_addr_t dmaaddr;
 337         int direction;
 338         u16 cmd;
 339         struct scatterlist sg;
 340
 341         BUG_ON(req->nr_phys_segments > 1);
 342
 343         if (rq_data_dir(req) == READ) {
 344                 direction = DMA_FROM_DEVICE;
 345                 cmd = viomajorsubtype_cdio | viocdread;
 346         } else {
 347                 direction = DMA_TO_DEVICE;
 348                 cmd = viomajorsubtype_cdio | viocdwrite;
 349         }
 350
 351         if (blk_rq_map_sg(req->q, req, &sg) == 0) {
 352                 printk(VIOCD_KERN_WARNING
 353                                 "error setting up scatter/gather list\n");
 354                 return -1;
 355         }
 356
 357         if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
 358                 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
 359                 return -1;
 360         }
 361         dmaaddr = sg_dma_address(&sg);
 362         len = sg_dma_len(&sg);
 363
 364         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 365                         HvLpEvent_Type_VirtualIo, cmd,
 366                         HvLpEvent_AckInd_DoAck,
 367                         HvLpEvent_AckType_ImmediateAck,
 368                         viopath_sourceinst(viopath_hostLp),
 369                         viopath_targetinst(viopath_hostLp),
 370                         (u64)req, VIOVERSION << 16,
 371                         ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
 372                         (u64)req->sector * 512, len, 0);
 373         if (hvrc != HvLpEvent_Rc_Good) {
 374                 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
 375                 return -1;
 376         }
 377
 378         return 0;
 379 }
 380
 381
 382 static int rwreq;
 383
 384 static void do_viocd_request(request_queue_t *q)
 385 {
 386         struct request *req;
 387
 388         while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
 389                 if (!blk_fs_request(req))
 390                         end_request(req, 0);
 391                 else if (send_request(req) < 0) {
 392                         printk(VIOCD_KERN_WARNING
 393                                         "unable to send message to OS/400!");
 394                         end_request(req, 0);
 395                 } else
 396                         rwreq++;
 397         }
 398 }
 399
 400 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
 401 {
 402         struct viocd_waitevent we;
 403         HvLpEvent_Rc hvrc;
 404         int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 405
 406         init_completion(&we.com);
 407
 408         /* Send the open event to OS/400 */
 409         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 410                         HvLpEvent_Type_VirtualIo,
 411                         viomajorsubtype_cdio | viocdcheck,
 412                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 413                         viopath_sourceinst(viopath_hostLp),
 414                         viopath_targetinst(viopath_hostLp),
 415                         (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
 416                         0, 0, 0);
 417         if (hvrc != 0) {
 418                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 419                                 (int)hvrc);
 420                 return -EIO;
 421         }
 422
 423         wait_for_completion(&we.com);
 424
 425         /* Check the return code.  If bad, assume no change */
 426         if (we.rc) {
 427                 const struct vio_error_entry *err =
 428                         vio_lookup_rc(viocd_err_table, we.sub_result);
 429                 printk(VIOCD_KERN_WARNING
 430                                 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
 431                                 we.rc, we.sub_result, err->msg);
 432                 return 0;
 433         }
 434
 435         return we.changed;
 436 }
 437
 438 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
 439 {
 440         HvLpEvent_Rc hvrc;
 441         u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
 442         /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
 443         u64 flags = !!locking;
 444         struct viocd_waitevent we;
 445
 446         init_completion(&we.com);
 447
 448         /* Send the lockdoor event to OS/400 */
 449         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 450                         HvLpEvent_Type_VirtualIo,
 451                         viomajorsubtype_cdio | viocdlockdoor,
 452                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 453                         viopath_sourceinst(viopath_hostLp),
 454                         viopath_targetinst(viopath_hostLp),
 455                         (u64)&we, VIOVERSION << 16,
 456                         (device_no << 48) | (flags << 32), 0, 0, 0);
 457         if (hvrc != 0) {
 458                 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
 459                                 (int)hvrc);
 460                 return -EIO;
 461         }
 462
 463         wait_for_completion(&we.com);
 464
 465         if (we.rc != 0)
 466                 return -EIO;
 467         return 0;
 468 }
 469
 470 static int viocd_packet(struct cdrom_device_info *cdi,
 471                 struct packet_command *cgc)
 472 {
 473         unsigned int buflen = cgc->buflen;
 474         int ret = -EIO;
 475
 476         switch (cgc->cmd[0]) {
 477         case GPCMD_READ_DISC_INFO:
 478                 {
 479                         disc_information *di = (disc_information *)cgc->buffer;
 480
 481                         if (buflen >= 2) {
 482                                 di->disc_information_length = cpu_to_be16(1);
 483                                 ret = 0;
 484                         }
 485                         if (buflen >= 3)
 486                                 di->erasable =
 487                                         (cdi->ops->capability & ~cdi->mask
 488                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
 489                 }
 490                 break;
 491         case GPCMD_GET_CONFIGURATION:
 492                 if (cgc->cmd[3] == CDF_RWRT) {
 493                         struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
 494
 495                         if ((buflen >=
 496                              (sizeof(struct feature_header) + sizeof(*rfd))) &&
 497                             (cdi->ops->capability & ~cdi->mask
 498                              & (CDC_DVD_RAM | CDC_RAM))) {
 499                                 rfd->feature_code = cpu_to_be16(CDF_RWRT);
 500                                 rfd->curr = 1;
 501                                 ret = 0;
 502                         }
 503                 }
 504                 break;
 505         default:
 506                 if (cgc->sense) {
 507                         /* indicate Unknown code */
 508                         cgc->sense->sense_key = 0x05;
 509                         cgc->sense->asc = 0x20;
 510                         cgc->sense->ascq = 0x00;
 511                 }
 512                 break;
 513         }
 514
 515         cgc->stat = ret;
 516         return ret;
 517 }
 518
 519 static void restart_all_queues(int first_index)
 520 {
 521         int i;
 522
 523         for (i = first_index + 1; i < viocd_numdev; i++)
 524                 if (viocd_diskinfo[i].viocd_disk)
 525                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 526         for (i = 0; i <= first_index; i++)
 527                 if (viocd_diskinfo[i].viocd_disk)
 528                         blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
 529 }
 530
 531 /* This routine handles incoming CD LP events */
 532 static void vio_handle_cd_event(struct HvLpEvent *event)
 533 {
 534         struct viocdlpevent *bevent;
 535         struct viocd_waitevent *pwe;
 536         struct disk_info *di;
 537         unsigned long flags;
 538         struct request *req;
 539
 540
 541         if (event == NULL)
 542                 /* Notification that a partition went away! */
 543                 return;
 544         /* First, we should NEVER get an int here...only acks */
 545         if (hvlpevent_is_int(event)) {
 546                 printk(VIOCD_KERN_WARNING
 547                                 "Yikes! got an int in viocd event handler!\n");
 548                 if (hvlpevent_need_ack(event)) {
 549                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 550                         HvCallEvent_ackLpEvent(event);
 551                 }
 552         }
 553
 554         bevent = (struct viocdlpevent *)event;
 555
 556         switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
 557         case viocdopen:
 558                 if (event->xRc == 0) {
 559                         di = &viocd_diskinfo[bevent->disk];
 560                         blk_queue_hardsect_size(di->viocd_disk->queue,
 561                                         bevent->block_size);
 562                         set_capacity(di->viocd_disk,
 563                                         bevent->media_size *
 564                                         bevent->block_size / 512);
 565                 }
 566                 /* FALLTHROUGH !! */
 567         case viocdgetinfo:
 568         case viocdlockdoor:
 569                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 570 return_complete:
 571                 pwe->rc = event->xRc;
 572                 pwe->sub_result = bevent->sub_result;
 573                 complete(&pwe->com);
 574                 break;
 575
 576         case viocdcheck:
 577                 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
 578                 pwe->changed = bevent->flags;
 579                 goto return_complete;
 580
 581         case viocdclose:
 582                 break;
 583
 584         case viocdwrite:
 585         case viocdread:
 586                 /*
 587                  * Since this is running in interrupt mode, we need to
 588                  * make sure we're not stepping on any global I/O operations
 589                  */
 590                 di = &viocd_diskinfo[bevent->disk];
 591                 spin_lock_irqsave(&viocd_reqlock, flags);
 592                 dma_unmap_single(di->dev, bevent->token, bevent->len,
 593                                 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
 594                                 ?  DMA_FROM_DEVICE : DMA_TO_DEVICE);
 595                 req = (struct request *)bevent->event.xCorrelationToken;
 596                 rwreq--;
 597
 598                 if (event->xRc != HvLpEvent_Rc_Good) {
 599                         const struct vio_error_entry *err =
 600                                 vio_lookup_rc(viocd_err_table,
 601                                                 bevent->sub_result);
 602                         printk(VIOCD_KERN_WARNING "request %p failed "
 603                                         "with rc %d:0x%04X: %s\n",
 604                                         req, event->xRc,
 605                                         bevent->sub_result, err->msg);
 606                         end_request(req, 0);
 607                 } else
 608                         end_request(req, 1);
 609
 610                 /* restart handling of incoming requests */
 611                 spin_unlock_irqrestore(&viocd_reqlock, flags);
 612                 restart_all_queues(bevent->disk);
 613                 break;
 614
 615         default:
 616                 printk(VIOCD_KERN_WARNING
 617                                 "message with invalid subtype %0x04X!\n",
 618                                 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
 619                 if (hvlpevent_need_ack(event)) {
 620                         event->xRc = HvLpEvent_Rc_InvalidSubtype;
 621                         HvCallEvent_ackLpEvent(event);
 622                 }
 623         }
 624 }
 625
 626 static struct cdrom_device_ops viocd_dops = {
 627         .open = viocd_open,
 628         .release = viocd_release,
 629         .media_changed = viocd_media_changed,
 630         .lock_door = viocd_lock_door,
 631         .generic_packet = viocd_packet,
 632         .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 | CDC_RAM
 633 };
 634
 635 static int __init find_capability(const char *type)
 636 {
 637         struct capability_entry *entry;
 638
 639         for(entry = capability_table; entry->type; ++entry)
 640                 if(!strncmp(entry->type, type, 4))
 641                         break;
 642         return entry->capability;
 643 }
 644
 645 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 646 {
 647         struct gendisk *gendisk;
 648         int deviceno;
 649         struct disk_info *d;
 650         struct cdrom_device_info *c;
 651         struct cdrom_info *ci;
 652         struct request_queue *q;
 653
 654         deviceno = vdev->unit_address;
 655         if (deviceno >= viocd_numdev)
 656                 return -ENODEV;
 657
 658         d = &viocd_diskinfo[deviceno];
 659         c = &d->viocd_info;
 660         ci = &viocd_unitinfo[deviceno];
 661
 662         c->ops = &viocd_dops;
 663         c->speed = 4;
 664         c->capacity = 1;
 665         c->handle = d;
 666         c->mask = ~find_capability(ci->type);
 667         sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
 668
 669         if (register_cdrom(c) != 0) {
 670                 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
 671                                 c->name);
 672                 goto out;
 673         }
 674         printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
 675                         "type %4.4s, model %3.3s\n",
 676                         c->name, ci->rsrcname, ci->type, ci->model);
 677         q = blk_init_queue(do_viocd_request, &viocd_reqlock);
 678         if (q == NULL) {
 679                 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
 680                                 c->name);
 681                 goto out_unregister_cdrom;
 682         }
 683         gendisk = alloc_disk(1);
 684         if (gendisk == NULL) {
 685                 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
 686                                 c->name);
 687                 goto out_cleanup_queue;
 688         }
 689         gendisk->major = VIOCD_MAJOR;
 690         gendisk->first_minor = deviceno;
 691         strncpy(gendisk->disk_name, c->name,
 692                         sizeof(gendisk->disk_name));
 693         snprintf(gendisk->devfs_name, sizeof(gendisk->devfs_name),
 694                         VIOCD_DEVICE_DEVFS "%d", deviceno);
 695         blk_queue_max_hw_segments(q, 1);
 696         blk_queue_max_phys_segments(q, 1);
 697         blk_queue_max_sectors(q, 4096 / 512);
 698         gendisk->queue = q;
 699         gendisk->fops = &viocd_fops;
 700         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
 701         set_capacity(gendisk, 0);
 702         gendisk->private_data = d;
 703         d->viocd_disk = gendisk;
 704         d->dev = &vdev->dev;
 705         gendisk->driverfs_dev = d->dev;
 706         add_disk(gendisk);
 707         return 0;
 708
 709 out_cleanup_queue:
 710         blk_cleanup_queue(q);
 711 out_unregister_cdrom:
 712         unregister_cdrom(c);
 713 out:
 714         return -ENODEV;
 715 }
 716
 717 static int viocd_remove(struct vio_dev *vdev)
 718 {
 719         struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
 720
 721         if (unregister_cdrom(&d->viocd_info) != 0)
 722                 printk(VIOCD_KERN_WARNING
 723                                 "Cannot unregister viocd CD-ROM %s!\n",
 724                                 d->viocd_info.name);
 725         del_gendisk(d->viocd_disk);
 726         blk_cleanup_queue(d->viocd_disk->queue);
 727         put_disk(d->viocd_disk);
 728         return 0;
 729 }
 730
 731 /**
 732  * viocd_device_table: Used by vio.c to match devices that we
 733  * support.
 734  */
 735 static struct vio_device_id viocd_device_table[] __devinitdata = {
 736         { "viocd", "" },
 737         { "", "" }
 738 };
 739 MODULE_DEVICE_TABLE(vio, viocd_device_table);
 740
 741 static struct vio_driver viocd_driver = {
 742         .id_table = viocd_device_table,
 743         .probe = viocd_probe,
 744         .remove = viocd_remove,
 745         .driver = {
 746                 .name = "viocd",
 747                 .owner = THIS_MODULE,
 748         }
 749 };
 750
 751 static int __init viocd_init(void)
 752 {
 753         struct proc_dir_entry *e;
 754         int ret = 0;
 755
 756         if (viopath_hostLp == HvLpIndexInvalid) {
 757                 vio_set_hostlp();
 758                 /* If we don't have a host, bail out */
 759                 if (viopath_hostLp == HvLpIndexInvalid)
 760                         return -ENODEV;
 761         }
 762
 763         printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
 764                         viopath_hostLp);
 765
 766         if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
 767                 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
 768                                 VIOCD_MAJOR, VIOCD_DEVICE);
 769                 return -EIO;
 770         }
 771
 772         ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
 773                         MAX_CD_REQ + 2);
 774         if (ret) {
 775                 printk(VIOCD_KERN_WARNING
 776                                 "error opening path to host partition %d\n",
 777                                 viopath_hostLp);
 778                 goto out_unregister;
 779         }
 780
 781         /* Initialize our request handler */
 782         vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
 783
 784         get_viocd_info();
 785
 786         spin_lock_init(&viocd_reqlock);
 787
 788         ret = vio_register_driver(&viocd_driver);
 789         if (ret)
 790                 goto out_free_info;
 791
 792         e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
 793         if (e) {
 794                 e->owner = THIS_MODULE;
 795                 e->proc_fops = &proc_viocd_operations;
 796         }
 797
 798         return 0;
 799
 800 out_free_info:
 801         dma_free_coherent(iSeries_vio_dev,
 802                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 803                         viocd_unitinfo, unitinfo_dmaaddr);
 804         vio_clearHandler(viomajorsubtype_cdio);
 805         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 806 out_unregister:
 807         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 808         return ret;
 809 }
 810
 811 static void __exit viocd_exit(void)
 812 {
 813         remove_proc_entry("iSeries/viocd", NULL);
 814         vio_unregister_driver(&viocd_driver);
 815         if (viocd_unitinfo != NULL)
 816                 dma_free_coherent(iSeries_vio_dev,
 817                                 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
 818                                 viocd_unitinfo, unitinfo_dmaaddr);
 819         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 820         vio_clearHandler(viomajorsubtype_cdio);
 821         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
 822 }
 823
 824 module_init(viocd_init);
 825 module_exit(viocd_exit);
 826 MODULE_LICENSE("GPL");