| 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), NULL, |
| 890 | "iseries!vt%d", i); |
| 891 | device_create(tape_class, NULL, MKDEV(VIOTAPE_MAJOR, i | 0x80), NULL, |
| 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); |