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   1 /* -*- linux-c -*-
   2  *  drivers/char/viotape.c
   3  *
   4  *  iSeries Virtual Tape
   5  *
   6  *  Authors: Dave Boutcher <boutcher@us.ibm.com>
   7  *           Ryan Arnold <ryanarn@us.ibm.com>
   8  *           Colin Devilbiss <devilbis@us.ibm.com>
   9  *           Stephen Rothwell
  10  *
  11  * (C) Copyright 2000-2004 IBM Corporation
  12  *
  13  * This program is free software;  you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation; either version 2 of the
  16  * License, or (at your option) anyu later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * This routine provides access to tape drives owned and managed by an OS/400
  28  * partition running on the same box as this Linux partition.
  29  *
  30  * All tape operations are performed by sending messages back and forth to
  31  * the OS/400 partition.  The format of the messages is defined in
  32  * iseries/vio.h
  33  */
  34 #include <linux/module.h>
  35 #include <linux/kernel.h>
  36 #include <linux/errno.h>
  37 #include <linux/init.h>
  38 #include <linux/wait.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/mtio.h>
  41 #include <linux/device.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/fs.h>
  44 #include <linux/cdev.h>
  45 #include <linux/major.h>
  46 #include <linux/completion.h>
  47 #include <linux/proc_fs.h>
  48 #include <linux/seq_file.h>
  49 #include <linux/smp_lock.h>
  50
  51 #include <asm/uaccess.h>
  52 #include <asm/ioctls.h>
  53 #include <asm/firmware.h>
  54 #include <asm/vio.h>
  55 #include <asm/iseries/vio.h>
  56 #include <asm/iseries/hv_lp_event.h>
  57 #include <asm/iseries/hv_call_event.h>
  58 #include <asm/iseries/hv_lp_config.h>
  59
  60 #define VIOTAPE_VERSION         "1.2"
  61 #define VIOTAPE_MAXREQ          1
  62
  63 #define VIOTAPE_KERN_WARN       KERN_WARNING "viotape: "
  64 #define VIOTAPE_KERN_INFO       KERN_INFO "viotape: "
  65
  66 static int viotape_numdev;
  67
  68 /*
  69  * The minor number follows the conventions of the SCSI tape drives.  The
  70  * rewind and mode are encoded in the minor #.  We use this struct to break
  71  * them out
  72  */
  73 struct viot_devinfo_struct {
  74         int devno;
  75         int mode;
  76         int rewind;
  77 };
  78
  79 #define VIOTAPOP_RESET          0
  80 #define VIOTAPOP_FSF            1
  81 #define VIOTAPOP_BSF            2
  82 #define VIOTAPOP_FSR            3
  83 #define VIOTAPOP_BSR            4
  84 #define VIOTAPOP_WEOF           5
  85 #define VIOTAPOP_REW            6
  86 #define VIOTAPOP_NOP            7
  87 #define VIOTAPOP_EOM            8
  88 #define VIOTAPOP_ERASE          9
  89 #define VIOTAPOP_SETBLK        10
  90 #define VIOTAPOP_SETDENSITY    11
  91 #define VIOTAPOP_SETPOS        12
  92 #define VIOTAPOP_GETPOS        13
  93 #define VIOTAPOP_SETPART       14
  94 #define VIOTAPOP_UNLOAD        15
  95
  96 enum viotaperc {
  97         viotape_InvalidRange = 0x0601,
  98         viotape_InvalidToken = 0x0602,
  99         viotape_DMAError = 0x0603,
 100         viotape_UseError = 0x0604,
 101         viotape_ReleaseError = 0x0605,
 102         viotape_InvalidTape = 0x0606,
 103         viotape_InvalidOp = 0x0607,
 104         viotape_TapeErr = 0x0608,
 105
 106         viotape_AllocTimedOut = 0x0640,
 107         viotape_BOTEnc = 0x0641,
 108         viotape_BlankTape = 0x0642,
 109         viotape_BufferEmpty = 0x0643,
 110         viotape_CleanCartFound = 0x0644,
 111         viotape_CmdNotAllowed = 0x0645,
 112         viotape_CmdNotSupported = 0x0646,
 113         viotape_DataCheck = 0x0647,
 114         viotape_DecompressErr = 0x0648,
 115         viotape_DeviceTimeout = 0x0649,
 116         viotape_DeviceUnavail = 0x064a,
 117         viotape_DeviceBusy = 0x064b,
 118         viotape_EndOfMedia = 0x064c,
 119         viotape_EndOfTape = 0x064d,
 120         viotape_EquipCheck = 0x064e,
 121         viotape_InsufficientRs = 0x064f,
 122         viotape_InvalidLogBlk = 0x0650,
 123         viotape_LengthError = 0x0651,
 124         viotape_LibDoorOpen = 0x0652,
 125         viotape_LoadFailure = 0x0653,
 126         viotape_NotCapable = 0x0654,
 127         viotape_NotOperational = 0x0655,
 128         viotape_NotReady = 0x0656,
 129         viotape_OpCancelled = 0x0657,
 130         viotape_PhyLinkErr = 0x0658,
 131         viotape_RdyNotBOT = 0x0659,
 132         viotape_TapeMark = 0x065a,
 133         viotape_WriteProt = 0x065b
 134 };
 135
 136 static const struct vio_error_entry viotape_err_table[] = {
 137         { viotape_InvalidRange, EIO, "Internal error" },
 138         { viotape_InvalidToken, EIO, "Internal error" },
 139         { viotape_DMAError, EIO, "DMA error" },
 140         { viotape_UseError, EIO, "Internal error" },
 141         { viotape_ReleaseError, EIO, "Internal error" },
 142         { viotape_InvalidTape, EIO, "Invalid tape device" },
 143         { viotape_InvalidOp, EIO, "Invalid operation" },
 144         { viotape_TapeErr, EIO, "Tape error" },
 145         { viotape_AllocTimedOut, EBUSY, "Allocate timed out" },
 146         { viotape_BOTEnc, EIO, "Beginning of tape encountered" },
 147         { viotape_BlankTape, EIO, "Blank tape" },
 148         { viotape_BufferEmpty, EIO, "Buffer empty" },
 149         { viotape_CleanCartFound, ENOMEDIUM, "Cleaning cartridge found" },
 150         { viotape_CmdNotAllowed, EIO, "Command not allowed" },
 151         { viotape_CmdNotSupported, EIO, "Command not supported" },
 152         { viotape_DataCheck, EIO, "Data check" },
 153         { viotape_DecompressErr, EIO, "Decompression error" },
 154         { viotape_DeviceTimeout, EBUSY, "Device timeout" },
 155         { viotape_DeviceUnavail, EIO, "Device unavailable" },
 156         { viotape_DeviceBusy, EBUSY, "Device busy" },
 157         { viotape_EndOfMedia, ENOSPC, "End of media" },
 158         { viotape_EndOfTape, ENOSPC, "End of tape" },
 159         { viotape_EquipCheck, EIO, "Equipment check" },
 160         { viotape_InsufficientRs, EOVERFLOW, "Insufficient tape resources" },
 161         { viotape_InvalidLogBlk, EIO, "Invalid logical block location" },
 162         { viotape_LengthError, EOVERFLOW, "Length error" },
 163         { viotape_LibDoorOpen, EBUSY, "Door open" },
 164         { viotape_LoadFailure, ENOMEDIUM, "Load failure" },
 165         { viotape_NotCapable, EIO, "Not capable" },
 166         { viotape_NotOperational, EIO, "Not operational" },
 167         { viotape_NotReady, EIO, "Not ready" },
 168         { viotape_OpCancelled, EIO, "Operation cancelled" },
 169         { viotape_PhyLinkErr, EIO, "Physical link error" },
 170         { viotape_RdyNotBOT, EIO, "Ready but not beginning of tape" },
 171         { viotape_TapeMark, EIO, "Tape mark" },
 172         { viotape_WriteProt, EROFS, "Write protection error" },
 173         { 0, 0, NULL },
 174 };
 175
 176 /* Maximum number of tapes we support */
 177 #define VIOTAPE_MAX_TAPE        HVMAXARCHITECTEDVIRTUALTAPES
 178 #define MAX_PARTITIONS          4
 179
 180 /* defines for current tape state */
 181 #define VIOT_IDLE               0
 182 #define VIOT_READING            1
 183 #define VIOT_WRITING            2
 184
 185 /* Our info on the tapes */
 186 static struct {
 187         const char *rsrcname;
 188         const char *type;
 189         const char *model;
 190 } viotape_unitinfo[VIOTAPE_MAX_TAPE];
 191
 192 static struct mtget viomtget[VIOTAPE_MAX_TAPE];
 193
 194 static struct class *tape_class;
 195
 196 static struct device *tape_device[VIOTAPE_MAX_TAPE];
 197
 198 /*
 199  * maintain the current state of each tape (and partition)
 200  * so that we know when to write EOF marks.
 201  */
 202 static struct {
 203         unsigned char   cur_part;
 204         unsigned char   part_stat_rwi[MAX_PARTITIONS];
 205 } state[VIOTAPE_MAX_TAPE];
 206
 207 /* We single-thread */
 208 static struct semaphore reqSem;
 209
 210 /*
 211  * When we send a request, we use this struct to get the response back
 212  * from the interrupt handler
 213  */
 214 struct op_struct {
 215         void                    *buffer;
 216         dma_addr_t              dmaaddr;
 217         size_t                  count;
 218         int                     rc;
 219         int                     non_blocking;
 220         struct completion       com;
 221         struct device           *dev;
 222         struct op_struct        *next;
 223 };
 224
 225 static spinlock_t       op_struct_list_lock;
 226 static struct op_struct *op_struct_list;
 227
 228 /* forward declaration to resolve interdependence */
 229 static int chg_state(int index, unsigned char new_state, struct file *file);
 230
 231 /* procfs support */
 232 static int proc_viotape_show(struct seq_file *m, void *v)
 233 {
 234         int i;
 235
 236         seq_printf(m, "viotape driver version " VIOTAPE_VERSION "\n");
 237         for (i = 0; i < viotape_numdev; i++) {
 238                 seq_printf(m, "viotape device %d is iSeries resource %10.10s"
 239                                 "type %4.4s, model %3.3s\n",
 240                                 i, viotape_unitinfo[i].rsrcname,
 241                                 viotape_unitinfo[i].type,
 242                                 viotape_unitinfo[i].model);
 243         }
 244         return 0;
 245 }
 246
 247 static int proc_viotape_open(struct inode *inode, struct file *file)
 248 {
 249         return single_open(file, proc_viotape_show, NULL);
 250 }
 251
 252 static const struct file_operations proc_viotape_operations = {
 253         .owner          = THIS_MODULE,
 254         .open           = proc_viotape_open,
 255         .read           = seq_read,
 256         .llseek         = seq_lseek,
 257         .release        = single_release,
 258 };
 259
 260 /* Decode the device minor number into its parts */
 261 void get_dev_info(struct inode *ino, struct viot_devinfo_struct *devi)
 262 {
 263         devi->devno = iminor(ino) & 0x1F;
 264         devi->mode = (iminor(ino) & 0x60) >> 5;
 265         /* if bit is set in the minor, do _not_ rewind automatically */
 266         devi->rewind = (iminor(ino) & 0x80) == 0;
 267 }
 268
 269 /* This is called only from the exit and init paths, so no need for locking */
 270 static void clear_op_struct_pool(void)
 271 {
 272         while (op_struct_list) {
 273                 struct op_struct *toFree = op_struct_list;
 274                 op_struct_list = op_struct_list->next;
 275                 kfree(toFree);
 276         }
 277 }
 278
 279 /* Likewise, this is only called from the init path */
 280 static int add_op_structs(int structs)
 281 {
 282         int i;
 283
 284         for (i = 0; i < structs; ++i) {
 285                 struct op_struct *new_struct =
 286                         kmalloc(sizeof(*new_struct), GFP_KERNEL);
 287                 if (!new_struct) {
 288                         clear_op_struct_pool();
 289                         return -ENOMEM;
 290                 }
 291                 new_struct->next = op_struct_list;
 292                 op_struct_list = new_struct;
 293         }
 294         return 0;
 295 }
 296
 297 /* Allocate an op structure from our pool */
 298 static struct op_struct *get_op_struct(void)
 299 {
 300         struct op_struct *retval;
 301         unsigned long flags;
 302
 303         spin_lock_irqsave(&op_struct_list_lock, flags);
 304         retval = op_struct_list;
 305         if (retval)
 306                 op_struct_list = retval->next;
 307         spin_unlock_irqrestore(&op_struct_list_lock, flags);
 308         if (retval) {
 309                 memset(retval, 0, sizeof(*retval));
 310                 init_completion(&retval->com);
 311         }
 312
 313         return retval;
 314 }
 315
 316 /* Return an op structure to our pool */
 317 static void free_op_struct(struct op_struct *op_struct)
 318 {
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&op_struct_list_lock, flags);
 322         op_struct->next = op_struct_list;
 323         op_struct_list = op_struct;
 324         spin_unlock_irqrestore(&op_struct_list_lock, flags);
 325 }
 326
 327 /* Map our tape return codes to errno values */
 328 int tape_rc_to_errno(int tape_rc, char *operation, int tapeno)
 329 {
 330         const struct vio_error_entry *err;
 331
 332         if (tape_rc == 0)
 333                 return 0;
 334
 335         err = vio_lookup_rc(viotape_err_table, tape_rc);
 336         printk(VIOTAPE_KERN_WARN "error(%s) 0x%04x on Device %d (%-10s): %s\n",
 337                         operation, tape_rc, tapeno,
 338                         viotape_unitinfo[tapeno].rsrcname, err->msg);
 339         return -err->errno;
 340 }
 341
 342 /* Write */
 343 static ssize_t viotap_write(struct file *file, const char *buf,
 344                 size_t count, loff_t * ppos)
 345 {
 346         HvLpEvent_Rc hvrc;
 347         unsigned short flags = file->f_flags;
 348         int noblock = ((flags & O_NONBLOCK) != 0);
 349         ssize_t ret;
 350         struct viot_devinfo_struct devi;
 351         struct op_struct *op = get_op_struct();
 352
 353         if (op == NULL)
 354                 return -ENOMEM;
 355
 356         get_dev_info(file->f_path.dentry->d_inode, &devi);
 357
 358         /*
 359          * We need to make sure we can send a request.  We use
 360          * a semaphore to keep track of # requests in use.  If
 361          * we are non-blocking, make sure we don't block on the
 362          * semaphore
 363          */
 364         if (noblock) {
 365                 if (down_trylock(&reqSem)) {
 366                         ret = -EWOULDBLOCK;
 367                         goto free_op;
 368                 }
 369         } else
 370                 down(&reqSem);
 371
 372         /* Allocate a DMA buffer */
 373         op->dev = tape_device[devi.devno];
 374         op->buffer = dma_alloc_coherent(op->dev, count, &op->dmaaddr,
 375                         GFP_ATOMIC);
 376
 377         if (op->buffer == NULL) {
 378                 printk(VIOTAPE_KERN_WARN
 379                                 "error allocating dma buffer for len %ld\n",
 380                                 count);
 381                 ret = -EFAULT;
 382                 goto up_sem;
 383         }
 384
 385         /* Copy the data into the buffer */
 386         if (copy_from_user(op->buffer, buf, count)) {
 387                 printk(VIOTAPE_KERN_WARN "tape: error on copy from user\n");
 388                 ret = -EFAULT;
 389                 goto free_dma;
 390         }
 391
 392         op->non_blocking = noblock;
 393         init_completion(&op->com);
 394         op->count = count;
 395
 396         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 397                         HvLpEvent_Type_VirtualIo,
 398                         viomajorsubtype_tape | viotapewrite,
 399                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 400                         viopath_sourceinst(viopath_hostLp),
 401                         viopath_targetinst(viopath_hostLp),
 402                         (u64)(unsigned long)op, VIOVERSION << 16,
 403                         ((u64)devi.devno << 48) | op->dmaaddr, count, 0, 0);
 404         if (hvrc != HvLpEvent_Rc_Good) {
 405                 printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
 406                                 (int)hvrc);
 407                 ret = -EIO;
 408                 goto free_dma;
 409         }
 410
 411         if (noblock)
 412                 return count;
 413
 414         wait_for_completion(&op->com);
 415
 416         if (op->rc)
 417                 ret = tape_rc_to_errno(op->rc, "write", devi.devno);
 418         else {
 419                 chg_state(devi.devno, VIOT_WRITING, file);
 420                 ret = op->count;
 421         }
 422
 423 free_dma:
 424         dma_free_coherent(op->dev, count, op->buffer, op->dmaaddr);
 425 up_sem:
 426         up(&reqSem);
 427 free_op:
 428         free_op_struct(op);
 429         return ret;
 430 }
 431
 432 /* read */
 433 static ssize_t viotap_read(struct file *file, char *buf, size_t count,
 434                 loff_t *ptr)
 435 {
 436         HvLpEvent_Rc hvrc;
 437         unsigned short flags = file->f_flags;
 438         struct op_struct *op = get_op_struct();
 439         int noblock = ((flags & O_NONBLOCK) != 0);
 440         ssize_t ret;
 441         struct viot_devinfo_struct devi;
 442
 443         if (op == NULL)
 444                 return -ENOMEM;
 445
 446         get_dev_info(file->f_path.dentry->d_inode, &devi);
 447
 448         /*
 449          * We need to make sure we can send a request.  We use
 450          * a semaphore to keep track of # requests in use.  If
 451          * we are non-blocking, make sure we don't block on the
 452          * semaphore
 453          */
 454         if (noblock) {
 455                 if (down_trylock(&reqSem)) {
 456                         ret = -EWOULDBLOCK;
 457                         goto free_op;
 458                 }
 459         } else
 460                 down(&reqSem);
 461
 462         chg_state(devi.devno, VIOT_READING, file);
 463
 464         /* Allocate a DMA buffer */
 465         op->dev = tape_device[devi.devno];
 466         op->buffer = dma_alloc_coherent(op->dev, count, &op->dmaaddr,
 467                         GFP_ATOMIC);
 468         if (op->buffer == NULL) {
 469                 ret = -EFAULT;
 470                 goto up_sem;
 471         }
 472
 473         op->count = count;
 474         init_completion(&op->com);
 475
 476         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 477                         HvLpEvent_Type_VirtualIo,
 478                         viomajorsubtype_tape | viotaperead,
 479                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 480                         viopath_sourceinst(viopath_hostLp),
 481                         viopath_targetinst(viopath_hostLp),
 482                         (u64)(unsigned long)op, VIOVERSION << 16,
 483                         ((u64)devi.devno << 48) | op->dmaaddr, count, 0, 0);
 484         if (hvrc != HvLpEvent_Rc_Good) {
 485                 printk(VIOTAPE_KERN_WARN "tape hv error on op %d\n",
 486                                 (int)hvrc);
 487                 ret = -EIO;
 488                 goto free_dma;
 489         }
 490
 491         wait_for_completion(&op->com);
 492
 493         if (op->rc)
 494                 ret = tape_rc_to_errno(op->rc, "read", devi.devno);
 495         else {
 496                 ret = op->count;
 497                 if (ret && copy_to_user(buf, op->buffer, ret)) {
 498                         printk(VIOTAPE_KERN_WARN "error on copy_to_user\n");
 499                         ret = -EFAULT;
 500                 }
 501         }
 502
 503 free_dma:
 504         dma_free_coherent(op->dev, count, op->buffer, op->dmaaddr);
 505 up_sem:
 506         up(&reqSem);
 507 free_op:
 508         free_op_struct(op);
 509         return ret;
 510 }
 511
 512 /* ioctl */
 513 static int viotap_ioctl(struct inode *inode, struct file *file,
 514                 unsigned int cmd, unsigned long arg)
 515 {
 516         HvLpEvent_Rc hvrc;
 517         int ret;
 518         struct viot_devinfo_struct devi;
 519         struct mtop mtc;
 520         u32 myOp;
 521         struct op_struct *op = get_op_struct();
 522
 523         if (op == NULL)
 524                 return -ENOMEM;
 525
 526         get_dev_info(file->f_path.dentry->d_inode, &devi);
 527
 528         down(&reqSem);
 529
 530         ret = -EINVAL;
 531
 532         switch (cmd) {
 533         case MTIOCTOP:
 534                 ret = -EFAULT;
 535                 /*
 536                  * inode is null if and only if we (the kernel)
 537                  * made the request
 538                  */
 539                 if (inode == NULL)
 540                         memcpy(&mtc, (void *) arg, sizeof(struct mtop));
 541                 else if (copy_from_user((char *)&mtc, (char *)arg,
 542                                         sizeof(struct mtop)))
 543                         goto free_op;
 544
 545                 ret = -EIO;
 546                 switch (mtc.mt_op) {
 547                 case MTRESET:
 548                         myOp = VIOTAPOP_RESET;
 549                         break;
 550                 case MTFSF:
 551                         myOp = VIOTAPOP_FSF;
 552                         break;
 553                 case MTBSF:
 554                         myOp = VIOTAPOP_BSF;
 555                         break;
 556                 case MTFSR:
 557                         myOp = VIOTAPOP_FSR;
 558                         break;
 559                 case MTBSR:
 560                         myOp = VIOTAPOP_BSR;
 561                         break;
 562                 case MTWEOF:
 563                         myOp = VIOTAPOP_WEOF;
 564                         break;
 565                 case MTREW:
 566                         myOp = VIOTAPOP_REW;
 567                         break;
 568                 case MTNOP:
 569                         myOp = VIOTAPOP_NOP;
 570                         break;
 571                 case MTEOM:
 572                         myOp = VIOTAPOP_EOM;
 573                         break;
 574                 case MTERASE:
 575                         myOp = VIOTAPOP_ERASE;
 576                         break;
 577                 case MTSETBLK:
 578                         myOp = VIOTAPOP_SETBLK;
 579                         break;
 580                 case MTSETDENSITY:
 581                         myOp = VIOTAPOP_SETDENSITY;
 582                         break;
 583                 case MTTELL:
 584                         myOp = VIOTAPOP_GETPOS;
 585                         break;
 586                 case MTSEEK:
 587                         myOp = VIOTAPOP_SETPOS;
 588                         break;
 589                 case MTSETPART:
 590                         myOp = VIOTAPOP_SETPART;
 591                         break;
 592                 case MTOFFL:
 593                         myOp = VIOTAPOP_UNLOAD;
 594                         break;
 595                 default:
 596                         printk(VIOTAPE_KERN_WARN "MTIOCTOP called "
 597                                         "with invalid op 0x%x\n", mtc.mt_op);
 598                         goto free_op;
 599                 }
 600
 601                 /*
 602                  * if we moved the head, we are no longer
 603                  * reading or writing
 604                  */
 605                 switch (mtc.mt_op) {
 606                 case MTFSF:
 607                 case MTBSF:
 608                 case MTFSR:
 609                 case MTBSR:
 610                 case MTTELL:
 611                 case MTSEEK:
 612                 case MTREW:
 613                         chg_state(devi.devno, VIOT_IDLE, file);
 614                 }
 615
 616                 init_completion(&op->com);
 617                 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 618                                 HvLpEvent_Type_VirtualIo,
 619                                 viomajorsubtype_tape | viotapeop,
 620                                 HvLpEvent_AckInd_DoAck,
 621                                 HvLpEvent_AckType_ImmediateAck,
 622                                 viopath_sourceinst(viopath_hostLp),
 623                                 viopath_targetinst(viopath_hostLp),
 624                                 (u64)(unsigned long)op,
 625                                 VIOVERSION << 16,
 626                                 ((u64)devi.devno << 48), 0,
 627                                 (((u64)myOp) << 32) | mtc.mt_count, 0);
 628                 if (hvrc != HvLpEvent_Rc_Good) {
 629                         printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
 630                                         (int)hvrc);
 631                         goto free_op;
 632                 }
 633                 wait_for_completion(&op->com);
 634                 ret = tape_rc_to_errno(op->rc, "tape operation", devi.devno);
 635                 goto free_op;
 636
 637         case MTIOCGET:
 638                 ret = -EIO;
 639                 init_completion(&op->com);
 640                 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 641                                 HvLpEvent_Type_VirtualIo,
 642                                 viomajorsubtype_tape | viotapegetstatus,
 643                                 HvLpEvent_AckInd_DoAck,
 644                                 HvLpEvent_AckType_ImmediateAck,
 645                                 viopath_sourceinst(viopath_hostLp),
 646                                 viopath_targetinst(viopath_hostLp),
 647                                 (u64)(unsigned long)op, VIOVERSION << 16,
 648                                 ((u64)devi.devno << 48), 0, 0, 0);
 649                 if (hvrc != HvLpEvent_Rc_Good) {
 650                         printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
 651                                         (int)hvrc);
 652                         goto free_op;
 653                 }
 654                 wait_for_completion(&op->com);
 655
 656                 /* Operation is complete - grab the error code */
 657                 ret = tape_rc_to_errno(op->rc, "get status", devi.devno);
 658                 free_op_struct(op);
 659                 up(&reqSem);
 660
 661                 if ((ret == 0) && copy_to_user((void *)arg,
 662                                         &viomtget[devi.devno],
 663                                         sizeof(viomtget[0])))
 664                         ret = -EFAULT;
 665                 return ret;
 666         case MTIOCPOS:
 667                 printk(VIOTAPE_KERN_WARN "Got an (unsupported) MTIOCPOS\n");
 668                 break;
 669         default:
 670                 printk(VIOTAPE_KERN_WARN "got an unsupported ioctl 0x%0x\n",
 671                                 cmd);
 672                 break;
 673         }
 674
 675 free_op:
 676         free_op_struct(op);
 677         up(&reqSem);
 678         return ret;
 679 }
 680
 681 static long viotap_unlocked_ioctl(struct file *file,
 682                 unsigned int cmd, unsigned long arg)
 683 {
 684         long rc;
 685
 686         lock_kernel();
 687         rc = viotap_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
 688         unlock_kernel();
 689         return rc;
 690 }
 691
 692 static int viotap_open(struct inode *inode, struct file *file)
 693 {
 694         HvLpEvent_Rc hvrc;
 695         struct viot_devinfo_struct devi;
 696         int ret;
 697         struct op_struct *op = get_op_struct();
 698
 699         if (op == NULL)
 700                 return -ENOMEM;
 701
 702         lock_kernel();
 703         get_dev_info(file->f_path.dentry->d_inode, &devi);
 704
 705         /* Note: We currently only support one mode! */
 706         if ((devi.devno >= viotape_numdev) || (devi.mode)) {
 707                 ret = -ENODEV;
 708                 goto free_op;
 709         }
 710
 711         init_completion(&op->com);
 712
 713         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 714                         HvLpEvent_Type_VirtualIo,
 715                         viomajorsubtype_tape | viotapeopen,
 716                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 717                         viopath_sourceinst(viopath_hostLp),
 718                         viopath_targetinst(viopath_hostLp),
 719                         (u64)(unsigned long)op, VIOVERSION << 16,
 720                         ((u64)devi.devno << 48), 0, 0, 0);
 721         if (hvrc != 0) {
 722                 printk(VIOTAPE_KERN_WARN "bad rc on signalLpEvent %d\n",
 723                                 (int) hvrc);
 724                 ret = -EIO;
 725                 goto free_op;
 726         }
 727
 728         wait_for_completion(&op->com);
 729         ret = tape_rc_to_errno(op->rc, "open", devi.devno);
 730
 731 free_op:
 732         free_op_struct(op);
 733         unlock_kernel();
 734         return ret;
 735 }
 736
 737
 738 static int viotap_release(struct inode *inode, struct file *file)
 739 {
 740         HvLpEvent_Rc hvrc;
 741         struct viot_devinfo_struct devi;
 742         int ret = 0;
 743         struct op_struct *op = get_op_struct();
 744
 745         if (op == NULL)
 746                 return -ENOMEM;
 747         init_completion(&op->com);
 748
 749         get_dev_info(file->f_path.dentry->d_inode, &devi);
 750
 751         if (devi.devno >= viotape_numdev) {
 752                 ret = -ENODEV;
 753                 goto free_op;
 754         }
 755
 756         chg_state(devi.devno, VIOT_IDLE, file);
 757
 758         if (devi.rewind) {
 759                 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 760                                 HvLpEvent_Type_VirtualIo,
 761                                 viomajorsubtype_tape | viotapeop,
 762                                 HvLpEvent_AckInd_DoAck,
 763                                 HvLpEvent_AckType_ImmediateAck,
 764                                 viopath_sourceinst(viopath_hostLp),
 765                                 viopath_targetinst(viopath_hostLp),
 766                                 (u64)(unsigned long)op, VIOVERSION << 16,
 767                                 ((u64)devi.devno << 48), 0,
 768                                 ((u64)VIOTAPOP_REW) << 32, 0);
 769                 wait_for_completion(&op->com);
 770
 771                 tape_rc_to_errno(op->rc, "rewind", devi.devno);
 772         }
 773
 774         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 775                         HvLpEvent_Type_VirtualIo,
 776                         viomajorsubtype_tape | viotapeclose,
 777                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 778                         viopath_sourceinst(viopath_hostLp),
 779                         viopath_targetinst(viopath_hostLp),
 780                         (u64)(unsigned long)op, VIOVERSION << 16,
 781                         ((u64)devi.devno << 48), 0, 0, 0);
 782         if (hvrc != 0) {
 783                 printk(VIOTAPE_KERN_WARN "bad rc on signalLpEvent %d\n",
 784                                 (int) hvrc);
 785                 ret = -EIO;
 786                 goto free_op;
 787         }
 788
 789         wait_for_completion(&op->com);
 790
 791         if (op->rc)
 792                 printk(VIOTAPE_KERN_WARN "close failed\n");
 793
 794 free_op:
 795         free_op_struct(op);
 796         return ret;
 797 }
 798
 799 const struct file_operations viotap_fops = {
 800         .owner =                THIS_MODULE,
 801         .read =                 viotap_read,
 802         .write =                viotap_write,
 803         .unlocked_ioctl =       viotap_unlocked_ioctl,
 804         .open =                 viotap_open,
 805         .release =              viotap_release,
 806 };
 807
 808 /* Handle interrupt events for tape */
 809 static void vioHandleTapeEvent(struct HvLpEvent *event)
 810 {
 811         int tapeminor;
 812         struct op_struct *op;
 813         struct viotapelpevent *tevent = (struct viotapelpevent *)event;
 814
 815         if (event == NULL) {
 816                 /* Notification that a partition went away! */
 817                 if (!viopath_isactive(viopath_hostLp)) {
 818                         /* TODO! Clean up */
 819                 }
 820                 return;
 821         }
 822
 823         tapeminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
 824         op = (struct op_struct *)event->xCorrelationToken;
 825         switch (tapeminor) {
 826         case viotapeopen:
 827         case viotapeclose:
 828                 op->rc = tevent->sub_type_result;
 829                 complete(&op->com);
 830                 break;
 831         case viotaperead:
 832                 op->rc = tevent->sub_type_result;
 833                 op->count = tevent->len;
 834                 complete(&op->com);
 835                 break;
 836         case viotapewrite:
 837                 if (op->non_blocking) {
 838                         dma_free_coherent(op->dev, op->count,
 839                                         op->buffer, op->dmaaddr);
 840                         free_op_struct(op);
 841                         up(&reqSem);
 842                 } else {
 843                         op->rc = tevent->sub_type_result;
 844                         op->count = tevent->len;
 845                         complete(&op->com);
 846                 }
 847                 break;
 848         case viotapeop:
 849         case viotapegetpos:
 850         case viotapesetpos:
 851         case viotapegetstatus:
 852                 if (op) {
 853                         op->count = tevent->u.op.count;
 854                         op->rc = tevent->sub_type_result;
 855                         if (!op->non_blocking)
 856                                 complete(&op->com);
 857                 }
 858                 break;
 859         default:
 860                 printk(VIOTAPE_KERN_WARN "weird ack\n");
 861         }
 862 }
 863
 864 static int viotape_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 865 {
 866         int i = vdev->unit_address;
 867         int j;
 868         struct device_node *node = vdev->dev.archdata.of_node;
 869
 870         if (i > VIOTAPE_MAX_TAPE)
 871                 return -ENODEV;
 872         if (!node)
 873                 return -ENODEV;
 874
 875         if (i >= viotape_numdev)
 876                 viotape_numdev = i + 1;
 877
 878         tape_device[i] = &vdev->dev;
 879         viotape_unitinfo[i].rsrcname = of_get_property(node,
 880                                         "linux,vio_rsrcname", NULL);
 881         viotape_unitinfo[i].type = of_get_property(node, "linux,vio_type",
 882                                         NULL);
 883         viotape_unitinfo[i].model = of_get_property(node, "linux,vio_model",
 884                                         NULL);
 885
 886         state[i].cur_part = 0;
 887         for (j = 0; j < MAX_PARTITIONS; ++j)
 888                 state[i].part_stat_rwi[j] = VIOT_IDLE;
 889         device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i),
 890                         "iseries!vt%d", i);
 891         device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i | 0x80),
 892                         "iseries!nvt%d", i);
 893         printk(VIOTAPE_KERN_INFO "tape iseries/vt%d is iSeries "
 894                         "resource %10.10s type %4.4s, model %3.3s\n",
 895                         i, viotape_unitinfo[i].rsrcname,
 896                         viotape_unitinfo[i].type, viotape_unitinfo[i].model);
 897         return 0;
 898 }
 899
 900 static int viotape_remove(struct vio_dev *vdev)
 901 {
 902         int i = vdev->unit_address;
 903
 904         device_destroy(tape_class, MKDEV(VIOTAPE_MAJOR, i | 0x80));
 905         device_destroy(tape_class, MKDEV(VIOTAPE_MAJOR, i));
 906         return 0;
 907 }
 908
 909 /**
 910  * viotape_device_table: Used by vio.c to match devices that we
 911  * support.
 912  */
 913 static struct vio_device_id viotape_device_table[] __devinitdata = {
 914         { "byte", "IBM,iSeries-viotape" },
 915         { "", "" }
 916 };
 917 MODULE_DEVICE_TABLE(vio, viotape_device_table);
 918
 919 static struct vio_driver viotape_driver = {
 920         .id_table = viotape_device_table,
 921         .probe = viotape_probe,
 922         .remove = viotape_remove,
 923         .driver = {
 924                 .name = "viotape",
 925                 .owner = THIS_MODULE,
 926         }
 927 };
 928
 929
 930 int __init viotap_init(void)
 931 {
 932         int ret;
 933
 934         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 935                 return -ENODEV;
 936
 937         op_struct_list = NULL;
 938         if ((ret = add_op_structs(VIOTAPE_MAXREQ)) < 0) {
 939                 printk(VIOTAPE_KERN_WARN "couldn't allocate op structs\n");
 940                 return ret;
 941         }
 942         spin_lock_init(&op_struct_list_lock);
 943
 944         sema_init(&reqSem, VIOTAPE_MAXREQ);
 945
 946         if (viopath_hostLp == HvLpIndexInvalid) {
 947                 vio_set_hostlp();
 948                 if (viopath_hostLp == HvLpIndexInvalid) {
 949                         ret = -ENODEV;
 950                         goto clear_op;
 951                 }
 952         }
 953
 954         ret = viopath_open(viopath_hostLp, viomajorsubtype_tape,
 955                         VIOTAPE_MAXREQ + 2);
 956         if (ret) {
 957                 printk(VIOTAPE_KERN_WARN
 958                                 "error on viopath_open to hostlp %d\n", ret);
 959                 ret = -EIO;
 960                 goto clear_op;
 961         }
 962
 963         printk(VIOTAPE_KERN_INFO "vers " VIOTAPE_VERSION
 964                         ", hosting partition %d\n", viopath_hostLp);
 965
 966         vio_setHandler(viomajorsubtype_tape, vioHandleTapeEvent);
 967
 968         ret = register_chrdev(VIOTAPE_MAJOR, "viotape", &viotap_fops);
 969         if (ret < 0) {
 970                 printk(VIOTAPE_KERN_WARN "Error registering viotape device\n");
 971                 goto clear_handler;
 972         }
 973
 974         tape_class = class_create(THIS_MODULE, "tape");
 975         if (IS_ERR(tape_class)) {
 976                 printk(VIOTAPE_KERN_WARN "Unable to allocat class\n");
 977                 ret = PTR_ERR(tape_class);
 978                 goto unreg_chrdev;
 979         }
 980
 981         ret = vio_register_driver(&viotape_driver);
 982         if (ret)
 983                 goto unreg_class;
 984
 985         proc_create("iSeries/viotape", S_IFREG|S_IRUGO, NULL,
 986                     &proc_viotape_operations);
 987
 988         return 0;
 989
 990 unreg_class:
 991         class_destroy(tape_class);
 992 unreg_chrdev:
 993         unregister_chrdev(VIOTAPE_MAJOR, "viotape");
 994 clear_handler:
 995         vio_clearHandler(viomajorsubtype_tape);
 996         viopath_close(viopath_hostLp, viomajorsubtype_tape, VIOTAPE_MAXREQ + 2);
 997 clear_op:
 998         clear_op_struct_pool();
 999         return ret;
1000 }
1001
1002 /* Give a new state to the tape object */
1003 static int chg_state(int index, unsigned char new_state, struct file *file)
1004 {
1005         unsigned char *cur_state =
1006             &state[index].part_stat_rwi[state[index].cur_part];
1007         int rc = 0;
1008
1009         /* if the same state, don't bother */
1010         if (*cur_state == new_state)
1011                 return 0;
1012
1013         /* write an EOF if changing from writing to some other state */
1014         if (*cur_state == VIOT_WRITING) {
1015                 struct mtop write_eof = { MTWEOF, 1 };
1016
1017                 rc = viotap_ioctl(NULL, file, MTIOCTOP,
1018                                   (unsigned long)&write_eof);
1019         }
1020         *cur_state = new_state;
1021         return rc;
1022 }
1023
1024 /* Cleanup */
1025 static void __exit viotap_exit(void)
1026 {
1027         remove_proc_entry("iSeries/viotape", NULL);
1028         vio_unregister_driver(&viotape_driver);
1029         class_destroy(tape_class);
1030         unregister_chrdev(VIOTAPE_MAJOR, "viotape");
1031         viopath_close(viopath_hostLp, viomajorsubtype_tape, VIOTAPE_MAXREQ + 2);
1032         vio_clearHandler(viomajorsubtype_tape);
1033         clear_op_struct_pool();
1034 }
1035
1036 MODULE_LICENSE("GPL");
1037 module_init(viotap_init);
1038 module_exit(viotap_exit);