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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 <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 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/config.h>
  35 #include <linux/version.h>
  36 #include <linux/module.h>
  37 #include <linux/kernel.h>
  38 #include <linux/errno.h>
  39 #include <linux/init.h>
  40 #include <linux/wait.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/mtio.h>
  43 #include <linux/device.h>
  44 #include <linux/dma-mapping.h>
  45 #include <linux/fs.h>
  46 #include <linux/cdev.h>
  47 #include <linux/devfs_fs_kernel.h>
  48 #include <linux/major.h>
  49 #include <linux/completion.h>
  50 #include <linux/proc_fs.h>
  51 #include <linux/seq_file.h>
  52
  53 #include <asm/uaccess.h>
  54 #include <asm/ioctls.h>
  55
  56 #include <asm/vio.h>
  57 #include <asm/iSeries/vio.h>
  58 #include <asm/iSeries/HvLpEvent.h>
  59 #include <asm/iSeries/HvCallEvent.h>
  60 #include <asm/iSeries/HvLpConfig.h>
  61
  62 #define VIOTAPE_VERSION         "1.2"
  63 #define VIOTAPE_MAXREQ          1
  64
  65 #define VIOTAPE_KERN_WARN       KERN_WARNING "viotape: "
  66 #define VIOTAPE_KERN_INFO       KERN_INFO "viotape: "
  67
  68 static int viotape_numdev;
  69
  70 /*
  71  * The minor number follows the conventions of the SCSI tape drives.  The
  72  * rewind and mode are encoded in the minor #.  We use this struct to break
  73  * them out
  74  */
  75 struct viot_devinfo_struct {
  76         int devno;
  77         int mode;
  78         int rewind;
  79 };
  80
  81 #define VIOTAPOP_RESET          0
  82 #define VIOTAPOP_FSF            1
  83 #define VIOTAPOP_BSF            2
  84 #define VIOTAPOP_FSR            3
  85 #define VIOTAPOP_BSR            4
  86 #define VIOTAPOP_WEOF           5
  87 #define VIOTAPOP_REW            6
  88 #define VIOTAPOP_NOP            7
  89 #define VIOTAPOP_EOM            8
  90 #define VIOTAPOP_ERASE          9
  91 #define VIOTAPOP_SETBLK        10
  92 #define VIOTAPOP_SETDENSITY    11
  93 #define VIOTAPOP_SETPOS        12
  94 #define VIOTAPOP_GETPOS        13
  95 #define VIOTAPOP_SETPART       14
  96 #define VIOTAPOP_UNLOAD        15
  97
  98 struct viotapelpevent {
  99         struct HvLpEvent event;
 100         u32 reserved;
 101         u16 version;
 102         u16 sub_type_result;
 103         u16 tape;
 104         u16 flags;
 105         u32 token;
 106         u64 len;
 107         union {
 108                 struct {
 109                         u32 tape_op;
 110                         u32 count;
 111                 } op;
 112                 struct {
 113                         u32 type;
 114                         u32 resid;
 115                         u32 dsreg;
 116                         u32 gstat;
 117                         u32 erreg;
 118                         u32 file_no;
 119                         u32 block_no;
 120                 } get_status;
 121                 struct {
 122                         u32 block_no;
 123                 } get_pos;
 124         } u;
 125 };
 126
 127 enum viotapesubtype {
 128         viotapeopen = 0x0001,
 129         viotapeclose = 0x0002,
 130         viotaperead = 0x0003,
 131         viotapewrite = 0x0004,
 132         viotapegetinfo = 0x0005,
 133         viotapeop = 0x0006,
 134         viotapegetpos = 0x0007,
 135         viotapesetpos = 0x0008,
 136         viotapegetstatus = 0x0009
 137 };
 138
 139 enum viotaperc {
 140         viotape_InvalidRange = 0x0601,
 141         viotape_InvalidToken = 0x0602,
 142         viotape_DMAError = 0x0603,
 143         viotape_UseError = 0x0604,
 144         viotape_ReleaseError = 0x0605,
 145         viotape_InvalidTape = 0x0606,
 146         viotape_InvalidOp = 0x0607,
 147         viotape_TapeErr = 0x0608,
 148
 149         viotape_AllocTimedOut = 0x0640,
 150         viotape_BOTEnc = 0x0641,
 151         viotape_BlankTape = 0x0642,
 152         viotape_BufferEmpty = 0x0643,
 153         viotape_CleanCartFound = 0x0644,
 154         viotape_CmdNotAllowed = 0x0645,
 155         viotape_CmdNotSupported = 0x0646,
 156         viotape_DataCheck = 0x0647,
 157         viotape_DecompressErr = 0x0648,
 158         viotape_DeviceTimeout = 0x0649,
 159         viotape_DeviceUnavail = 0x064a,
 160         viotape_DeviceBusy = 0x064b,
 161         viotape_EndOfMedia = 0x064c,
 162         viotape_EndOfTape = 0x064d,
 163         viotape_EquipCheck = 0x064e,
 164         viotape_InsufficientRs = 0x064f,
 165         viotape_InvalidLogBlk = 0x0650,
 166         viotape_LengthError = 0x0651,
 167         viotape_LibDoorOpen = 0x0652,
 168         viotape_LoadFailure = 0x0653,
 169         viotape_NotCapable = 0x0654,
 170         viotape_NotOperational = 0x0655,
 171         viotape_NotReady = 0x0656,
 172         viotape_OpCancelled = 0x0657,
 173         viotape_PhyLinkErr = 0x0658,
 174         viotape_RdyNotBOT = 0x0659,
 175         viotape_TapeMark = 0x065a,
 176         viotape_WriteProt = 0x065b
 177 };
 178
 179 static const struct vio_error_entry viotape_err_table[] = {
 180         { viotape_InvalidRange, EIO, "Internal error" },
 181         { viotape_InvalidToken, EIO, "Internal error" },
 182         { viotape_DMAError, EIO, "DMA error" },
 183         { viotape_UseError, EIO, "Internal error" },
 184         { viotape_ReleaseError, EIO, "Internal error" },
 185         { viotape_InvalidTape, EIO, "Invalid tape device" },
 186         { viotape_InvalidOp, EIO, "Invalid operation" },
 187         { viotape_TapeErr, EIO, "Tape error" },
 188         { viotape_AllocTimedOut, EBUSY, "Allocate timed out" },
 189         { viotape_BOTEnc, EIO, "Beginning of tape encountered" },
 190         { viotape_BlankTape, EIO, "Blank tape" },
 191         { viotape_BufferEmpty, EIO, "Buffer empty" },
 192         { viotape_CleanCartFound, ENOMEDIUM, "Cleaning cartridge found" },
 193         { viotape_CmdNotAllowed, EIO, "Command not allowed" },
 194         { viotape_CmdNotSupported, EIO, "Command not supported" },
 195         { viotape_DataCheck, EIO, "Data check" },
 196         { viotape_DecompressErr, EIO, "Decompression error" },
 197         { viotape_DeviceTimeout, EBUSY, "Device timeout" },
 198         { viotape_DeviceUnavail, EIO, "Device unavailable" },
 199         { viotape_DeviceBusy, EBUSY, "Device busy" },
 200         { viotape_EndOfMedia, ENOSPC, "End of media" },
 201         { viotape_EndOfTape, ENOSPC, "End of tape" },
 202         { viotape_EquipCheck, EIO, "Equipment check" },
 203         { viotape_InsufficientRs, EOVERFLOW, "Insufficient tape resources" },
 204         { viotape_InvalidLogBlk, EIO, "Invalid logical block location" },
 205         { viotape_LengthError, EOVERFLOW, "Length error" },
 206         { viotape_LibDoorOpen, EBUSY, "Door open" },
 207         { viotape_LoadFailure, ENOMEDIUM, "Load failure" },
 208         { viotape_NotCapable, EIO, "Not capable" },
 209         { viotape_NotOperational, EIO, "Not operational" },
 210         { viotape_NotReady, EIO, "Not ready" },
 211         { viotape_OpCancelled, EIO, "Operation cancelled" },
 212         { viotape_PhyLinkErr, EIO, "Physical link error" },
 213         { viotape_RdyNotBOT, EIO, "Ready but not beginning of tape" },
 214         { viotape_TapeMark, EIO, "Tape mark" },
 215         { viotape_WriteProt, EROFS, "Write protection error" },
 216         { 0, 0, NULL },
 217 };
 218
 219 /* Maximum number of tapes we support */
 220 #define VIOTAPE_MAX_TAPE        HVMAXARCHITECTEDVIRTUALTAPES
 221 #define MAX_PARTITIONS          4
 222
 223 /* defines for current tape state */
 224 #define VIOT_IDLE               0
 225 #define VIOT_READING            1
 226 #define VIOT_WRITING            2
 227
 228 /* Our info on the tapes */
 229 struct tape_descr {
 230         char rsrcname[10];
 231         char type[4];
 232         char model[3];
 233 };
 234
 235 static struct tape_descr *viotape_unitinfo;
 236 static dma_addr_t viotape_unitinfo_token;
 237
 238 static struct mtget viomtget[VIOTAPE_MAX_TAPE];
 239
 240 static struct class *tape_class;
 241
 242 static struct device *tape_device[VIOTAPE_MAX_TAPE];
 243
 244 /*
 245  * maintain the current state of each tape (and partition)
 246  * so that we know when to write EOF marks.
 247  */
 248 static struct {
 249         unsigned char   cur_part;
 250         int             dev_handle;
 251         unsigned char   part_stat_rwi[MAX_PARTITIONS];
 252 } state[VIOTAPE_MAX_TAPE];
 253
 254 /* We single-thread */
 255 static struct semaphore reqSem;
 256
 257 /*
 258  * When we send a request, we use this struct to get the response back
 259  * from the interrupt handler
 260  */
 261 struct op_struct {
 262         void                    *buffer;
 263         dma_addr_t              dmaaddr;
 264         size_t                  count;
 265         int                     rc;
 266         int                     non_blocking;
 267         struct completion       com;
 268         struct device           *dev;
 269         struct op_struct        *next;
 270 };
 271
 272 static spinlock_t       op_struct_list_lock;
 273 static struct op_struct *op_struct_list;
 274
 275 /* forward declaration to resolve interdependence */
 276 static int chg_state(int index, unsigned char new_state, struct file *file);
 277
 278 /* procfs support */
 279 static int proc_viotape_show(struct seq_file *m, void *v)
 280 {
 281         int i;
 282
 283         seq_printf(m, "viotape driver version " VIOTAPE_VERSION "\n");
 284         for (i = 0; i < viotape_numdev; i++) {
 285                 seq_printf(m, "viotape device %d is iSeries resource %10.10s"
 286                                 "type %4.4s, model %3.3s\n",
 287                                 i, viotape_unitinfo[i].rsrcname,
 288                                 viotape_unitinfo[i].type,
 289                                 viotape_unitinfo[i].model);
 290         }
 291         return 0;
 292 }
 293
 294 static int proc_viotape_open(struct inode *inode, struct file *file)
 295 {
 296         return single_open(file, proc_viotape_show, NULL);
 297 }
 298
 299 static struct file_operations proc_viotape_operations = {
 300         .open           = proc_viotape_open,
 301         .read           = seq_read,
 302         .llseek         = seq_lseek,
 303         .release        = single_release,
 304 };
 305
 306 /* Decode the device minor number into its parts */
 307 void get_dev_info(struct inode *ino, struct viot_devinfo_struct *devi)
 308 {
 309         devi->devno = iminor(ino) & 0x1F;
 310         devi->mode = (iminor(ino) & 0x60) >> 5;
 311         /* if bit is set in the minor, do _not_ rewind automatically */
 312         devi->rewind = (iminor(ino) & 0x80) == 0;
 313 }
 314
 315 /* This is called only from the exit and init paths, so no need for locking */
 316 static void clear_op_struct_pool(void)
 317 {
 318         while (op_struct_list) {
 319                 struct op_struct *toFree = op_struct_list;
 320                 op_struct_list = op_struct_list->next;
 321                 kfree(toFree);
 322         }
 323 }
 324
 325 /* Likewise, this is only called from the init path */
 326 static int add_op_structs(int structs)
 327 {
 328         int i;
 329
 330         for (i = 0; i < structs; ++i) {
 331                 struct op_struct *new_struct =
 332                         kmalloc(sizeof(*new_struct), GFP_KERNEL);
 333                 if (!new_struct) {
 334                         clear_op_struct_pool();
 335                         return -ENOMEM;
 336                 }
 337                 new_struct->next = op_struct_list;
 338                 op_struct_list = new_struct;
 339         }
 340         return 0;
 341 }
 342
 343 /* Allocate an op structure from our pool */
 344 static struct op_struct *get_op_struct(void)
 345 {
 346         struct op_struct *retval;
 347         unsigned long flags;
 348
 349         spin_lock_irqsave(&op_struct_list_lock, flags);
 350         retval = op_struct_list;
 351         if (retval)
 352                 op_struct_list = retval->next;
 353         spin_unlock_irqrestore(&op_struct_list_lock, flags);
 354         if (retval) {
 355                 memset(retval, 0, sizeof(*retval));
 356                 init_completion(&retval->com);
 357         }
 358
 359         return retval;
 360 }
 361
 362 /* Return an op structure to our pool */
 363 static void free_op_struct(struct op_struct *op_struct)
 364 {
 365         unsigned long flags;
 366
 367         spin_lock_irqsave(&op_struct_list_lock, flags);
 368         op_struct->next = op_struct_list;
 369         op_struct_list = op_struct;
 370         spin_unlock_irqrestore(&op_struct_list_lock, flags);
 371 }
 372
 373 /* Map our tape return codes to errno values */
 374 int tape_rc_to_errno(int tape_rc, char *operation, int tapeno)
 375 {
 376         const struct vio_error_entry *err;
 377
 378         if (tape_rc == 0)
 379                 return 0;
 380
 381         err = vio_lookup_rc(viotape_err_table, tape_rc);
 382         printk(VIOTAPE_KERN_WARN "error(%s) 0x%04x on Device %d (%-10s): %s\n",
 383                         operation, tape_rc, tapeno,
 384                         viotape_unitinfo[tapeno].rsrcname, err->msg);
 385         return -err->errno;
 386 }
 387
 388 /* Get info on all tapes from OS/400 */
 389 static int get_viotape_info(void)
 390 {
 391         HvLpEvent_Rc hvrc;
 392         int i;
 393         size_t len = sizeof(*viotape_unitinfo) * VIOTAPE_MAX_TAPE;
 394         struct op_struct *op = get_op_struct();
 395
 396         if (op == NULL)
 397                 return -ENOMEM;
 398
 399         viotape_unitinfo = dma_alloc_coherent(iSeries_vio_dev, len,
 400                 &viotape_unitinfo_token, GFP_ATOMIC);
 401         if (viotape_unitinfo == NULL) {
 402                 free_op_struct(op);
 403                 return -ENOMEM;
 404         }
 405
 406         memset(viotape_unitinfo, 0, len);
 407
 408         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 409                         HvLpEvent_Type_VirtualIo,
 410                         viomajorsubtype_tape | viotapegetinfo,
 411                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 412                         viopath_sourceinst(viopath_hostLp),
 413                         viopath_targetinst(viopath_hostLp),
 414                         (u64) (unsigned long) op, VIOVERSION << 16,
 415                         viotape_unitinfo_token, len, 0, 0);
 416         if (hvrc != HvLpEvent_Rc_Good) {
 417                 printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
 418                                 (int)hvrc);
 419                 free_op_struct(op);
 420                 return -EIO;
 421         }
 422
 423         wait_for_completion(&op->com);
 424
 425         free_op_struct(op);
 426
 427         for (i = 0;
 428              ((i < VIOTAPE_MAX_TAPE) && (viotape_unitinfo[i].rsrcname[0]));
 429              i++)
 430                 viotape_numdev++;
 431         return 0;
 432 }
 433
 434
 435 /* Write */
 436 static ssize_t viotap_write(struct file *file, const char *buf,
 437                 size_t count, loff_t * ppos)
 438 {
 439         HvLpEvent_Rc hvrc;
 440         unsigned short flags = file->f_flags;
 441         int noblock = ((flags & O_NONBLOCK) != 0);
 442         ssize_t ret;
 443         struct viot_devinfo_struct devi;
 444         struct op_struct *op = get_op_struct();
 445
 446         if (op == NULL)
 447                 return -ENOMEM;
 448
 449         get_dev_info(file->f_dentry->d_inode, &devi);
 450
 451         /*
 452          * We need to make sure we can send a request.  We use
 453          * a semaphore to keep track of # requests in use.  If
 454          * we are non-blocking, make sure we don't block on the
 455          * semaphore
 456          */
 457         if (noblock) {
 458                 if (down_trylock(&reqSem)) {
 459                         ret = -EWOULDBLOCK;
 460                         goto free_op;
 461                 }
 462         } else
 463                 down(&reqSem);
 464
 465         /* Allocate a DMA buffer */
 466         op->dev = tape_device[devi.devno];
 467         op->buffer = dma_alloc_coherent(op->dev, count, &op->dmaaddr,
 468                         GFP_ATOMIC);
 469
 470         if (op->buffer == NULL) {
 471                 printk(VIOTAPE_KERN_WARN
 472                                 "error allocating dma buffer for len %ld\n",
 473                                 count);
 474                 ret = -EFAULT;
 475                 goto up_sem;
 476         }
 477
 478         /* Copy the data into the buffer */
 479         if (copy_from_user(op->buffer, buf, count)) {
 480                 printk(VIOTAPE_KERN_WARN "tape: error on copy from user\n");
 481                 ret = -EFAULT;
 482                 goto free_dma;
 483         }
 484
 485         op->non_blocking = noblock;
 486         init_completion(&op->com);
 487         op->count = count;
 488
 489         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 490                         HvLpEvent_Type_VirtualIo,
 491                         viomajorsubtype_tape | viotapewrite,
 492                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 493                         viopath_sourceinst(viopath_hostLp),
 494                         viopath_targetinst(viopath_hostLp),
 495                         (u64)(unsigned long)op, VIOVERSION << 16,
 496                         ((u64)devi.devno << 48) | op->dmaaddr, count, 0, 0);
 497         if (hvrc != HvLpEvent_Rc_Good) {
 498                 printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
 499                                 (int)hvrc);
 500                 ret = -EIO;
 501                 goto free_dma;
 502         }
 503
 504         if (noblock)
 505                 return count;
 506
 507         wait_for_completion(&op->com);
 508
 509         if (op->rc)
 510                 ret = tape_rc_to_errno(op->rc, "write", devi.devno);
 511         else {
 512                 chg_state(devi.devno, VIOT_WRITING, file);
 513                 ret = op->count;
 514         }
 515
 516 free_dma:
 517         dma_free_coherent(op->dev, count, op->buffer, op->dmaaddr);
 518 up_sem:
 519         up(&reqSem);
 520 free_op:
 521         free_op_struct(op);
 522         return ret;
 523 }
 524
 525 /* read */
 526 static ssize_t viotap_read(struct file *file, char *buf, size_t count,
 527                 loff_t *ptr)
 528 {
 529         HvLpEvent_Rc hvrc;
 530         unsigned short flags = file->f_flags;
 531         struct op_struct *op = get_op_struct();
 532         int noblock = ((flags & O_NONBLOCK) != 0);
 533         ssize_t ret;
 534         struct viot_devinfo_struct devi;
 535
 536         if (op == NULL)
 537                 return -ENOMEM;
 538
 539         get_dev_info(file->f_dentry->d_inode, &devi);
 540
 541         /*
 542          * We need to make sure we can send a request.  We use
 543          * a semaphore to keep track of # requests in use.  If
 544          * we are non-blocking, make sure we don't block on the
 545          * semaphore
 546          */
 547         if (noblock) {
 548                 if (down_trylock(&reqSem)) {
 549                         ret = -EWOULDBLOCK;
 550                         goto free_op;
 551                 }
 552         } else
 553                 down(&reqSem);
 554
 555         chg_state(devi.devno, VIOT_READING, file);
 556
 557         /* Allocate a DMA buffer */
 558         op->dev = tape_device[devi.devno];
 559         op->buffer = dma_alloc_coherent(op->dev, count, &op->dmaaddr,
 560                         GFP_ATOMIC);
 561         if (op->buffer == NULL) {
 562                 ret = -EFAULT;
 563                 goto up_sem;
 564         }
 565
 566         op->count = count;
 567         init_completion(&op->com);
 568
 569         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 570                         HvLpEvent_Type_VirtualIo,
 571                         viomajorsubtype_tape | viotaperead,
 572                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 573                         viopath_sourceinst(viopath_hostLp),
 574                         viopath_targetinst(viopath_hostLp),
 575                         (u64)(unsigned long)op, VIOVERSION << 16,
 576                         ((u64)devi.devno << 48) | op->dmaaddr, count, 0, 0);
 577         if (hvrc != HvLpEvent_Rc_Good) {
 578                 printk(VIOTAPE_KERN_WARN "tape hv error on op %d\n",
 579                                 (int)hvrc);
 580                 ret = -EIO;
 581                 goto free_dma;
 582         }
 583
 584         wait_for_completion(&op->com);
 585
 586         if (op->rc)
 587                 ret = tape_rc_to_errno(op->rc, "read", devi.devno);
 588         else {
 589                 ret = op->count;
 590                 if (ret && copy_to_user(buf, op->buffer, ret)) {
 591                         printk(VIOTAPE_KERN_WARN "error on copy_to_user\n");
 592                         ret = -EFAULT;
 593                 }
 594         }
 595
 596 free_dma:
 597         dma_free_coherent(op->dev, count, op->buffer, op->dmaaddr);
 598 up_sem:
 599         up(&reqSem);
 600 free_op:
 601         free_op_struct(op);
 602         return ret;
 603 }
 604
 605 /* ioctl */
 606 static int viotap_ioctl(struct inode *inode, struct file *file,
 607                 unsigned int cmd, unsigned long arg)
 608 {
 609         HvLpEvent_Rc hvrc;
 610         int ret;
 611         struct viot_devinfo_struct devi;
 612         struct mtop mtc;
 613         u32 myOp;
 614         struct op_struct *op = get_op_struct();
 615
 616         if (op == NULL)
 617                 return -ENOMEM;
 618
 619         get_dev_info(file->f_dentry->d_inode, &devi);
 620
 621         down(&reqSem);
 622
 623         ret = -EINVAL;
 624
 625         switch (cmd) {
 626         case MTIOCTOP:
 627                 ret = -EFAULT;
 628                 /*
 629                  * inode is null if and only if we (the kernel)
 630                  * made the request
 631                  */
 632                 if (inode == NULL)
 633                         memcpy(&mtc, (void *) arg, sizeof(struct mtop));
 634                 else if (copy_from_user((char *)&mtc, (char *)arg,
 635                                         sizeof(struct mtop)))
 636                         goto free_op;
 637
 638                 ret = -EIO;
 639                 switch (mtc.mt_op) {
 640                 case MTRESET:
 641                         myOp = VIOTAPOP_RESET;
 642                         break;
 643                 case MTFSF:
 644                         myOp = VIOTAPOP_FSF;
 645                         break;
 646                 case MTBSF:
 647                         myOp = VIOTAPOP_BSF;
 648                         break;
 649                 case MTFSR:
 650                         myOp = VIOTAPOP_FSR;
 651                         break;
 652                 case MTBSR:
 653                         myOp = VIOTAPOP_BSR;
 654                         break;
 655                 case MTWEOF:
 656                         myOp = VIOTAPOP_WEOF;
 657                         break;
 658                 case MTREW:
 659                         myOp = VIOTAPOP_REW;
 660                         break;
 661                 case MTNOP:
 662                         myOp = VIOTAPOP_NOP;
 663                         break;
 664                 case MTEOM:
 665                         myOp = VIOTAPOP_EOM;
 666                         break;
 667                 case MTERASE:
 668                         myOp = VIOTAPOP_ERASE;
 669                         break;
 670                 case MTSETBLK:
 671                         myOp = VIOTAPOP_SETBLK;
 672                         break;
 673                 case MTSETDENSITY:
 674                         myOp = VIOTAPOP_SETDENSITY;
 675                         break;
 676                 case MTTELL:
 677                         myOp = VIOTAPOP_GETPOS;
 678                         break;
 679                 case MTSEEK:
 680                         myOp = VIOTAPOP_SETPOS;
 681                         break;
 682                 case MTSETPART:
 683                         myOp = VIOTAPOP_SETPART;
 684                         break;
 685                 case MTOFFL:
 686                         myOp = VIOTAPOP_UNLOAD;
 687                         break;
 688                 default:
 689                         printk(VIOTAPE_KERN_WARN "MTIOCTOP called "
 690                                         "with invalid op 0x%x\n", mtc.mt_op);
 691                         goto free_op;
 692                 }
 693
 694                 /*
 695                  * if we moved the head, we are no longer
 696                  * reading or writing
 697                  */
 698                 switch (mtc.mt_op) {
 699                 case MTFSF:
 700                 case MTBSF:
 701                 case MTFSR:
 702                 case MTBSR:
 703                 case MTTELL:
 704                 case MTSEEK:
 705                 case MTREW:
 706                         chg_state(devi.devno, VIOT_IDLE, file);
 707                 }
 708
 709                 init_completion(&op->com);
 710                 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 711                                 HvLpEvent_Type_VirtualIo,
 712                                 viomajorsubtype_tape | viotapeop,
 713                                 HvLpEvent_AckInd_DoAck,
 714                                 HvLpEvent_AckType_ImmediateAck,
 715                                 viopath_sourceinst(viopath_hostLp),
 716                                 viopath_targetinst(viopath_hostLp),
 717                                 (u64)(unsigned long)op,
 718                                 VIOVERSION << 16,
 719                                 ((u64)devi.devno << 48), 0,
 720                                 (((u64)myOp) << 32) | mtc.mt_count, 0);
 721                 if (hvrc != HvLpEvent_Rc_Good) {
 722                         printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
 723                                         (int)hvrc);
 724                         goto free_op;
 725                 }
 726                 wait_for_completion(&op->com);
 727                 ret = tape_rc_to_errno(op->rc, "tape operation", devi.devno);
 728                 goto free_op;
 729
 730         case MTIOCGET:
 731                 ret = -EIO;
 732                 init_completion(&op->com);
 733                 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 734                                 HvLpEvent_Type_VirtualIo,
 735                                 viomajorsubtype_tape | viotapegetstatus,
 736                                 HvLpEvent_AckInd_DoAck,
 737                                 HvLpEvent_AckType_ImmediateAck,
 738                                 viopath_sourceinst(viopath_hostLp),
 739                                 viopath_targetinst(viopath_hostLp),
 740                                 (u64)(unsigned long)op, VIOVERSION << 16,
 741                                 ((u64)devi.devno << 48), 0, 0, 0);
 742                 if (hvrc != HvLpEvent_Rc_Good) {
 743                         printk(VIOTAPE_KERN_WARN "hv error on op %d\n",
 744                                         (int)hvrc);
 745                         goto free_op;
 746                 }
 747                 wait_for_completion(&op->com);
 748
 749                 /* Operation is complete - grab the error code */
 750                 ret = tape_rc_to_errno(op->rc, "get status", devi.devno);
 751                 free_op_struct(op);
 752                 up(&reqSem);
 753
 754                 if ((ret == 0) && copy_to_user((void *)arg,
 755                                         &viomtget[devi.devno],
 756                                         sizeof(viomtget[0])))
 757                         ret = -EFAULT;
 758                 return ret;
 759         case MTIOCPOS:
 760                 printk(VIOTAPE_KERN_WARN "Got an (unsupported) MTIOCPOS\n");
 761                 break;
 762         default:
 763                 printk(VIOTAPE_KERN_WARN "got an unsupported ioctl 0x%0x\n",
 764                                 cmd);
 765                 break;
 766         }
 767
 768 free_op:
 769         free_op_struct(op);
 770         up(&reqSem);
 771         return ret;
 772 }
 773
 774 static int viotap_open(struct inode *inode, struct file *file)
 775 {
 776         HvLpEvent_Rc hvrc;
 777         struct viot_devinfo_struct devi;
 778         int ret;
 779         struct op_struct *op = get_op_struct();
 780
 781         if (op == NULL)
 782                 return -ENOMEM;
 783
 784         get_dev_info(file->f_dentry->d_inode, &devi);
 785
 786         /* Note: We currently only support one mode! */
 787         if ((devi.devno >= viotape_numdev) || (devi.mode)) {
 788                 ret = -ENODEV;
 789                 goto free_op;
 790         }
 791
 792         init_completion(&op->com);
 793
 794         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 795                         HvLpEvent_Type_VirtualIo,
 796                         viomajorsubtype_tape | viotapeopen,
 797                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 798                         viopath_sourceinst(viopath_hostLp),
 799                         viopath_targetinst(viopath_hostLp),
 800                         (u64)(unsigned long)op, VIOVERSION << 16,
 801                         ((u64)devi.devno << 48), 0, 0, 0);
 802         if (hvrc != 0) {
 803                 printk(VIOTAPE_KERN_WARN "bad rc on signalLpEvent %d\n",
 804                                 (int) hvrc);
 805                 ret = -EIO;
 806                 goto free_op;
 807         }
 808
 809         wait_for_completion(&op->com);
 810         ret = tape_rc_to_errno(op->rc, "open", devi.devno);
 811
 812 free_op:
 813         free_op_struct(op);
 814         return ret;
 815 }
 816
 817
 818 static int viotap_release(struct inode *inode, struct file *file)
 819 {
 820         HvLpEvent_Rc hvrc;
 821         struct viot_devinfo_struct devi;
 822         int ret = 0;
 823         struct op_struct *op = get_op_struct();
 824
 825         if (op == NULL)
 826                 return -ENOMEM;
 827         init_completion(&op->com);
 828
 829         get_dev_info(file->f_dentry->d_inode, &devi);
 830
 831         if (devi.devno >= viotape_numdev) {
 832                 ret = -ENODEV;
 833                 goto free_op;
 834         }
 835
 836         chg_state(devi.devno, VIOT_IDLE, file);
 837
 838         if (devi.rewind) {
 839                 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 840                                 HvLpEvent_Type_VirtualIo,
 841                                 viomajorsubtype_tape | viotapeop,
 842                                 HvLpEvent_AckInd_DoAck,
 843                                 HvLpEvent_AckType_ImmediateAck,
 844                                 viopath_sourceinst(viopath_hostLp),
 845                                 viopath_targetinst(viopath_hostLp),
 846                                 (u64)(unsigned long)op, VIOVERSION << 16,
 847                                 ((u64)devi.devno << 48), 0,
 848                                 ((u64)VIOTAPOP_REW) << 32, 0);
 849                 wait_for_completion(&op->com);
 850
 851                 tape_rc_to_errno(op->rc, "rewind", devi.devno);
 852         }
 853
 854         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
 855                         HvLpEvent_Type_VirtualIo,
 856                         viomajorsubtype_tape | viotapeclose,
 857                         HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
 858                         viopath_sourceinst(viopath_hostLp),
 859                         viopath_targetinst(viopath_hostLp),
 860                         (u64)(unsigned long)op, VIOVERSION << 16,
 861                         ((u64)devi.devno << 48), 0, 0, 0);
 862         if (hvrc != 0) {
 863                 printk(VIOTAPE_KERN_WARN "bad rc on signalLpEvent %d\n",
 864                                 (int) hvrc);
 865                 ret = -EIO;
 866                 goto free_op;
 867         }
 868
 869         wait_for_completion(&op->com);
 870
 871         if (op->rc)
 872                 printk(VIOTAPE_KERN_WARN "close failed\n");
 873
 874 free_op:
 875         free_op_struct(op);
 876         return ret;
 877 }
 878
 879 struct file_operations viotap_fops = {
 880         owner: THIS_MODULE,
 881         read: viotap_read,
 882         write: viotap_write,
 883         ioctl: viotap_ioctl,
 884         open: viotap_open,
 885         release: viotap_release,
 886 };
 887
 888 /* Handle interrupt events for tape */
 889 static void vioHandleTapeEvent(struct HvLpEvent *event)
 890 {
 891         int tapeminor;
 892         struct op_struct *op;
 893         struct viotapelpevent *tevent = (struct viotapelpevent *)event;
 894
 895         if (event == NULL) {
 896                 /* Notification that a partition went away! */
 897                 if (!viopath_isactive(viopath_hostLp)) {
 898                         /* TODO! Clean up */
 899                 }
 900                 return;
 901         }
 902
 903         tapeminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
 904         op = (struct op_struct *)event->xCorrelationToken;
 905         switch (tapeminor) {
 906         case viotapegetinfo:
 907         case viotapeopen:
 908         case viotapeclose:
 909                 op->rc = tevent->sub_type_result;
 910                 complete(&op->com);
 911                 break;
 912         case viotaperead:
 913                 op->rc = tevent->sub_type_result;
 914                 op->count = tevent->len;
 915                 complete(&op->com);
 916                 break;
 917         case viotapewrite:
 918                 if (op->non_blocking) {
 919                         dma_free_coherent(op->dev, op->count,
 920                                         op->buffer, op->dmaaddr);
 921                         free_op_struct(op);
 922                         up(&reqSem);
 923                 } else {
 924                         op->rc = tevent->sub_type_result;
 925                         op->count = tevent->len;
 926                         complete(&op->com);
 927                 }
 928                 break;
 929         case viotapeop:
 930         case viotapegetpos:
 931         case viotapesetpos:
 932         case viotapegetstatus:
 933                 if (op) {
 934                         op->count = tevent->u.op.count;
 935                         op->rc = tevent->sub_type_result;
 936                         if (!op->non_blocking)
 937                                 complete(&op->com);
 938                 }
 939                 break;
 940         default:
 941                 printk(VIOTAPE_KERN_WARN "weird ack\n");
 942         }
 943 }
 944
 945 static int viotape_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 946 {
 947         char tapename[32];
 948         int i = vdev->unit_address;
 949         int j;
 950
 951         if (i >= viotape_numdev)
 952                 return -ENODEV;
 953
 954         tape_device[i] = &vdev->dev;
 955
 956         state[i].cur_part = 0;
 957         for (j = 0; j < MAX_PARTITIONS; ++j)
 958                 state[i].part_stat_rwi[j] = VIOT_IDLE;
 959         class_device_create(tape_class, MKDEV(VIOTAPE_MAJOR, i), NULL,
 960                         "iseries!vt%d", i);
 961         class_device_create(tape_class, MKDEV(VIOTAPE_MAJOR, i | 0x80),
 962                         NULL, "iseries!nvt%d", i);
 963         devfs_mk_cdev(MKDEV(VIOTAPE_MAJOR, i), S_IFCHR | S_IRUSR | S_IWUSR,
 964                         "iseries/vt%d", i);
 965         devfs_mk_cdev(MKDEV(VIOTAPE_MAJOR, i | 0x80),
 966                         S_IFCHR | S_IRUSR | S_IWUSR, "iseries/nvt%d", i);
 967         sprintf(tapename, "iseries/vt%d", i);
 968         state[i].dev_handle = devfs_register_tape(tapename);
 969         printk(VIOTAPE_KERN_INFO "tape %s is iSeries "
 970                         "resource %10.10s type %4.4s, model %3.3s\n",
 971                         tapename, viotape_unitinfo[i].rsrcname,
 972                         viotape_unitinfo[i].type, viotape_unitinfo[i].model);
 973         return 0;
 974 }
 975
 976 static int viotape_remove(struct vio_dev *vdev)
 977 {
 978         int i = vdev->unit_address;
 979
 980         devfs_remove("iseries/nvt%d", i);
 981         devfs_remove("iseries/vt%d", i);
 982         devfs_unregister_tape(state[i].dev_handle);
 983         class_device_destroy(tape_class, MKDEV(VIOTAPE_MAJOR, i | 0x80));
 984         class_device_destroy(tape_class, MKDEV(VIOTAPE_MAJOR, i));
 985         return 0;
 986 }
 987
 988 /**
 989  * viotape_device_table: Used by vio.c to match devices that we
 990  * support.
 991  */
 992 static struct vio_device_id viotape_device_table[] __devinitdata = {
 993         { "viotape", "" },
 994         { 0, }
 995 };
 996
 997 MODULE_DEVICE_TABLE(vio, viotape_device_table);
 998 static struct vio_driver viotape_driver = {
 999         .name = "viotape",
1000         .id_table = viotape_device_table,
1001         .probe = viotape_probe,
1002         .remove = viotape_remove
1003 };
1004
1005
1006 int __init viotap_init(void)
1007 {
1008         int ret;
1009         struct proc_dir_entry *e;
1010
1011         op_struct_list = NULL;
1012         if ((ret = add_op_structs(VIOTAPE_MAXREQ)) < 0) {
1013                 printk(VIOTAPE_KERN_WARN "couldn't allocate op structs\n");
1014                 return ret;
1015         }
1016         spin_lock_init(&op_struct_list_lock);
1017
1018         sema_init(&reqSem, VIOTAPE_MAXREQ);
1019
1020         if (viopath_hostLp == HvLpIndexInvalid) {
1021                 vio_set_hostlp();
1022                 if (viopath_hostLp == HvLpIndexInvalid) {
1023                         ret = -ENODEV;
1024                         goto clear_op;
1025                 }
1026         }
1027
1028         ret = viopath_open(viopath_hostLp, viomajorsubtype_tape,
1029                         VIOTAPE_MAXREQ + 2);
1030         if (ret) {
1031                 printk(VIOTAPE_KERN_WARN
1032                                 "error on viopath_open to hostlp %d\n", ret);
1033                 ret = -EIO;
1034                 goto clear_op;
1035         }
1036
1037         printk(VIOTAPE_KERN_INFO "vers " VIOTAPE_VERSION
1038                         ", hosting partition %d\n", viopath_hostLp);
1039
1040         vio_setHandler(viomajorsubtype_tape, vioHandleTapeEvent);
1041
1042         ret = register_chrdev(VIOTAPE_MAJOR, "viotape", &viotap_fops);
1043         if (ret < 0) {
1044                 printk(VIOTAPE_KERN_WARN "Error registering viotape device\n");
1045                 goto clear_handler;
1046         }
1047
1048         tape_class = class_create(THIS_MODULE, "tape");
1049         if (IS_ERR(tape_class)) {
1050                 printk(VIOTAPE_KERN_WARN "Unable to allocat class\n");
1051                 ret = PTR_ERR(tape_class);
1052                 goto unreg_chrdev;
1053         }
1054
1055         if ((ret = get_viotape_info()) < 0) {
1056                 printk(VIOTAPE_KERN_WARN "Unable to obtain virtual device information");
1057                 goto unreg_class;
1058         }
1059
1060         ret = vio_register_driver(&viotape_driver);
1061         if (ret)
1062                 goto unreg_class;
1063
1064         e = create_proc_entry("iSeries/viotape", S_IFREG|S_IRUGO, NULL);
1065         if (e) {
1066                 e->owner = THIS_MODULE;
1067                 e->proc_fops = &proc_viotape_operations;
1068         }
1069
1070         return 0;
1071
1072 unreg_class:
1073         class_destroy(tape_class);
1074 unreg_chrdev:
1075         unregister_chrdev(VIOTAPE_MAJOR, "viotape");
1076 clear_handler:
1077         vio_clearHandler(viomajorsubtype_tape);
1078         viopath_close(viopath_hostLp, viomajorsubtype_tape, VIOTAPE_MAXREQ + 2);
1079 clear_op:
1080         clear_op_struct_pool();
1081         return ret;
1082 }
1083
1084 /* Give a new state to the tape object */
1085 static int chg_state(int index, unsigned char new_state, struct file *file)
1086 {
1087         unsigned char *cur_state =
1088             &state[index].part_stat_rwi[state[index].cur_part];
1089         int rc = 0;
1090
1091         /* if the same state, don't bother */
1092         if (*cur_state == new_state)
1093                 return 0;
1094
1095         /* write an EOF if changing from writing to some other state */
1096         if (*cur_state == VIOT_WRITING) {
1097                 struct mtop write_eof = { MTWEOF, 1 };
1098
1099                 rc = viotap_ioctl(NULL, file, MTIOCTOP,
1100                                   (unsigned long)&write_eof);
1101         }
1102         *cur_state = new_state;
1103         return rc;
1104 }
1105
1106 /* Cleanup */
1107 static void __exit viotap_exit(void)
1108 {
1109         int ret;
1110
1111         remove_proc_entry("iSeries/viotape", NULL);
1112         vio_unregister_driver(&viotape_driver);
1113         class_destroy(tape_class);
1114         ret = unregister_chrdev(VIOTAPE_MAJOR, "viotape");
1115         if (ret < 0)
1116                 printk(VIOTAPE_KERN_WARN "Error unregistering device: %d\n",
1117                                 ret);
1118         if (viotape_unitinfo)
1119                 dma_free_coherent(iSeries_vio_dev,
1120                                 sizeof(viotape_unitinfo[0]) * VIOTAPE_MAX_TAPE,
1121                                 viotape_unitinfo, viotape_unitinfo_token);
1122         viopath_close(viopath_hostLp, viomajorsubtype_tape, VIOTAPE_MAXREQ + 2);
1123         vio_clearHandler(viomajorsubtype_tape);
1124         clear_op_struct_pool();
1125 }
1126
1127 MODULE_LICENSE("GPL");
1128 module_init(viotap_init);
1129 module_exit(viotap_exit);