1 /* sunvdc.c: Sun LDOM Virtual Disk Client. 2 * 3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net> 4 */ 5 6 #include <linux/module.h> 7 #include <linux/kernel.h> 8 #include <linux/types.h> 9 #include <linux/blkdev.h> 10 #include <linux/hdreg.h> 11 #include <linux/genhd.h> 12 #include <linux/slab.h> 13 #include <linux/spinlock.h> 14 #include <linux/completion.h> 15 #include <linux/delay.h> 16 #include <linux/init.h> 17 #include <linux/list.h> 18 #include <linux/scatterlist.h> 19 20 #include <asm/vio.h> 21 #include <asm/ldc.h> 22 23 #define DRV_MODULE_NAME "sunvdc" 24 #define PFX DRV_MODULE_NAME ": " 25 #define DRV_MODULE_VERSION "1.0" 26 #define DRV_MODULE_RELDATE "June 25, 2007" 27 28 static char version[] __devinitdata = 29 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 30 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 31 MODULE_DESCRIPTION("Sun LDOM virtual disk client driver"); 32 MODULE_LICENSE("GPL"); 33 MODULE_VERSION(DRV_MODULE_VERSION); 34 35 #define VDC_TX_RING_SIZE 256 36 37 #define WAITING_FOR_LINK_UP 0x01 38 #define WAITING_FOR_TX_SPACE 0x02 39 #define WAITING_FOR_GEN_CMD 0x04 40 #define WAITING_FOR_ANY -1 41 42 struct vdc_req_entry { 43 struct request *req; 44 }; 45 46 struct vdc_port { 47 struct vio_driver_state vio; 48 49 struct gendisk *disk; 50 51 struct vdc_completion *cmp; 52 53 u64 req_id; 54 u64 seq; 55 struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE]; 56 57 unsigned long ring_cookies; 58 59 u64 max_xfer_size; 60 u32 vdisk_block_size; 61 62 /* The server fills these in for us in the disk attribute 63 * ACK packet. 64 */ 65 u64 operations; 66 u32 vdisk_size; 67 u8 vdisk_type; 68 69 char disk_name[32]; 70 71 struct vio_disk_geom geom; 72 struct vio_disk_vtoc label; 73 }; 74 75 static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) 76 { 77 return container_of(vio, struct vdc_port, vio); 78 } 79 80 /* Ordered from largest major to lowest */ 81 static struct vio_version vdc_versions[] = { 82 { .major = 1, .minor = 0 }, 83 }; 84 85 #define VDCBLK_NAME "vdisk" 86 static int vdc_major; 87 #define PARTITION_SHIFT 3 88 89 static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr) 90 { 91 return vio_dring_avail(dr, VDC_TX_RING_SIZE); 92 } 93 94 static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) 95 { 96 struct gendisk *disk = bdev->bd_disk; 97 struct vdc_port *port = disk->private_data; 98 99 geo->heads = (u8) port->geom.num_hd; 100 geo->sectors = (u8) port->geom.num_sec; 101 geo->cylinders = port->geom.num_cyl; 102 103 return 0; 104 } 105 106 static struct block_device_operations vdc_fops = { 107 .owner = THIS_MODULE, 108 .getgeo = vdc_getgeo, 109 }; 110 111 static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for) 112 { 113 if (vio->cmp && 114 (waiting_for == -1 || 115 vio->cmp->waiting_for == waiting_for)) { 116 vio->cmp->err = err; 117 complete(&vio->cmp->com); 118 vio->cmp = NULL; 119 } 120 } 121 122 static void vdc_handshake_complete(struct vio_driver_state *vio) 123 { 124 vdc_finish(vio, 0, WAITING_FOR_LINK_UP); 125 } 126 127 static int vdc_handle_unknown(struct vdc_port *port, void *arg) 128 { 129 struct vio_msg_tag *pkt = arg; 130 131 printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", 132 pkt->type, pkt->stype, pkt->stype_env, pkt->sid); 133 printk(KERN_ERR PFX "Resetting connection.\n"); 134 135 ldc_disconnect(port->vio.lp); 136 137 return -ECONNRESET; 138 } 139 140 static int vdc_send_attr(struct vio_driver_state *vio) 141 { 142 struct vdc_port *port = to_vdc_port(vio); 143 struct vio_disk_attr_info pkt; 144 145 memset(&pkt, 0, sizeof(pkt)); 146 147 pkt.tag.type = VIO_TYPE_CTRL; 148 pkt.tag.stype = VIO_SUBTYPE_INFO; 149 pkt.tag.stype_env = VIO_ATTR_INFO; 150 pkt.tag.sid = vio_send_sid(vio); 151 152 pkt.xfer_mode = VIO_DRING_MODE; 153 pkt.vdisk_block_size = port->vdisk_block_size; 154 pkt.max_xfer_size = port->max_xfer_size; 155 156 viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n", 157 pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size); 158 159 return vio_ldc_send(&port->vio, &pkt, sizeof(pkt)); 160 } 161 162 static int vdc_handle_attr(struct vio_driver_state *vio, void *arg) 163 { 164 struct vdc_port *port = to_vdc_port(vio); 165 struct vio_disk_attr_info *pkt = arg; 166 167 viodbg(HS, "GOT ATTR stype[0x%x] ops[%lx] disk_size[%lu] disk_type[%x] " 168 "xfer_mode[0x%x] blksz[%u] max_xfer[%lu]\n", 169 pkt->tag.stype, pkt->operations, 170 pkt->vdisk_size, pkt->vdisk_type, 171 pkt->xfer_mode, pkt->vdisk_block_size, 172 pkt->max_xfer_size); 173 174 if (pkt->tag.stype == VIO_SUBTYPE_ACK) { 175 switch (pkt->vdisk_type) { 176 case VD_DISK_TYPE_DISK: 177 case VD_DISK_TYPE_SLICE: 178 break; 179 180 default: 181 printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n", 182 vio->name, pkt->vdisk_type); 183 return -ECONNRESET; 184 } 185 186 if (pkt->vdisk_block_size > port->vdisk_block_size) { 187 printk(KERN_ERR PFX "%s: BLOCK size increased " 188 "%u --> %u\n", 189 vio->name, 190 port->vdisk_block_size, pkt->vdisk_block_size); 191 return -ECONNRESET; 192 } 193 194 port->operations = pkt->operations; 195 port->vdisk_size = pkt->vdisk_size; 196 port->vdisk_type = pkt->vdisk_type; 197 if (pkt->max_xfer_size < port->max_xfer_size) 198 port->max_xfer_size = pkt->max_xfer_size; 199 port->vdisk_block_size = pkt->vdisk_block_size; 200 return 0; 201 } else { 202 printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name); 203 204 return -ECONNRESET; 205 } 206 } 207 208 static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc) 209 { 210 int err = desc->status; 211 212 vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD); 213 } 214 215 static void vdc_end_request(struct request *req, int error, int num_sectors) 216 { 217 __blk_end_request(req, error, num_sectors << 9); 218 } 219 220 static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr, 221 unsigned int index) 222 { 223 struct vio_disk_desc *desc = vio_dring_entry(dr, index); 224 struct vdc_req_entry *rqe = &port->rq_arr[index]; 225 struct request *req; 226 227 if (unlikely(desc->hdr.state != VIO_DESC_DONE)) 228 return; 229 230 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); 231 desc->hdr.state = VIO_DESC_FREE; 232 dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1); 233 234 req = rqe->req; 235 if (req == NULL) { 236 vdc_end_special(port, desc); 237 return; 238 } 239 240 rqe->req = NULL; 241 242 vdc_end_request(req, (desc->status ? -EIO : 0), desc->size >> 9); 243 244 if (blk_queue_stopped(port->disk->queue)) 245 blk_start_queue(port->disk->queue); 246 } 247 248 static int vdc_ack(struct vdc_port *port, void *msgbuf) 249 { 250 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 251 struct vio_dring_data *pkt = msgbuf; 252 253 if (unlikely(pkt->dring_ident != dr->ident || 254 pkt->start_idx != pkt->end_idx || 255 pkt->start_idx >= VDC_TX_RING_SIZE)) 256 return 0; 257 258 vdc_end_one(port, dr, pkt->start_idx); 259 260 return 0; 261 } 262 263 static int vdc_nack(struct vdc_port *port, void *msgbuf) 264 { 265 /* XXX Implement me XXX */ 266 return 0; 267 } 268 269 static void vdc_event(void *arg, int event) 270 { 271 struct vdc_port *port = arg; 272 struct vio_driver_state *vio = &port->vio; 273 unsigned long flags; 274 int err; 275 276 spin_lock_irqsave(&vio->lock, flags); 277 278 if (unlikely(event == LDC_EVENT_RESET || 279 event == LDC_EVENT_UP)) { 280 vio_link_state_change(vio, event); 281 spin_unlock_irqrestore(&vio->lock, flags); 282 return; 283 } 284 285 if (unlikely(event != LDC_EVENT_DATA_READY)) { 286 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event); 287 spin_unlock_irqrestore(&vio->lock, flags); 288 return; 289 } 290 291 err = 0; 292 while (1) { 293 union { 294 struct vio_msg_tag tag; 295 u64 raw[8]; 296 } msgbuf; 297 298 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); 299 if (unlikely(err < 0)) { 300 if (err == -ECONNRESET) 301 vio_conn_reset(vio); 302 break; 303 } 304 if (err == 0) 305 break; 306 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", 307 msgbuf.tag.type, 308 msgbuf.tag.stype, 309 msgbuf.tag.stype_env, 310 msgbuf.tag.sid); 311 err = vio_validate_sid(vio, &msgbuf.tag); 312 if (err < 0) 313 break; 314 315 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { 316 if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) 317 err = vdc_ack(port, &msgbuf); 318 else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) 319 err = vdc_nack(port, &msgbuf); 320 else 321 err = vdc_handle_unknown(port, &msgbuf); 322 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { 323 err = vio_control_pkt_engine(vio, &msgbuf); 324 } else { 325 err = vdc_handle_unknown(port, &msgbuf); 326 } 327 if (err < 0) 328 break; 329 } 330 if (err < 0) 331 vdc_finish(&port->vio, err, WAITING_FOR_ANY); 332 spin_unlock_irqrestore(&vio->lock, flags); 333 } 334 335 static int __vdc_tx_trigger(struct vdc_port *port) 336 { 337 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 338 struct vio_dring_data hdr = { 339 .tag = { 340 .type = VIO_TYPE_DATA, 341 .stype = VIO_SUBTYPE_INFO, 342 .stype_env = VIO_DRING_DATA, 343 .sid = vio_send_sid(&port->vio), 344 }, 345 .dring_ident = dr->ident, 346 .start_idx = dr->prod, 347 .end_idx = dr->prod, 348 }; 349 int err, delay; 350 351 hdr.seq = dr->snd_nxt; 352 delay = 1; 353 do { 354 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); 355 if (err > 0) { 356 dr->snd_nxt++; 357 break; 358 } 359 udelay(delay); 360 if ((delay <<= 1) > 128) 361 delay = 128; 362 } while (err == -EAGAIN); 363 364 return err; 365 } 366 367 static int __send_request(struct request *req) 368 { 369 struct vdc_port *port = req->rq_disk->private_data; 370 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 371 struct scatterlist sg[port->ring_cookies]; 372 struct vdc_req_entry *rqe; 373 struct vio_disk_desc *desc; 374 unsigned int map_perm; 375 int nsg, err, i; 376 u64 len; 377 u8 op; 378 379 map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; 380 381 if (rq_data_dir(req) == READ) { 382 map_perm |= LDC_MAP_W; 383 op = VD_OP_BREAD; 384 } else { 385 map_perm |= LDC_MAP_R; 386 op = VD_OP_BWRITE; 387 } 388 389 sg_init_table(sg, port->ring_cookies); 390 nsg = blk_rq_map_sg(req->q, req, sg); 391 392 len = 0; 393 for (i = 0; i < nsg; i++) 394 len += sg[i].length; 395 396 if (unlikely(vdc_tx_dring_avail(dr) < 1)) { 397 blk_stop_queue(port->disk->queue); 398 err = -ENOMEM; 399 goto out; 400 } 401 402 desc = vio_dring_cur(dr); 403 404 err = ldc_map_sg(port->vio.lp, sg, nsg, 405 desc->cookies, port->ring_cookies, 406 map_perm); 407 if (err < 0) { 408 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); 409 return err; 410 } 411 412 rqe = &port->rq_arr[dr->prod]; 413 rqe->req = req; 414 415 desc->hdr.ack = VIO_ACK_ENABLE; 416 desc->req_id = port->req_id; 417 desc->operation = op; 418 if (port->vdisk_type == VD_DISK_TYPE_DISK) { 419 desc->slice = 0xff; 420 } else { 421 desc->slice = 0; 422 } 423 desc->status = ~0; 424 desc->offset = (req->sector << 9) / port->vdisk_block_size; 425 desc->size = len; 426 desc->ncookies = err; 427 428 /* This has to be a non-SMP write barrier because we are writing 429 * to memory which is shared with the peer LDOM. 430 */ 431 wmb(); 432 desc->hdr.state = VIO_DESC_READY; 433 434 err = __vdc_tx_trigger(port); 435 if (err < 0) { 436 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); 437 } else { 438 port->req_id++; 439 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); 440 } 441 out: 442 443 return err; 444 } 445 446 static void do_vdc_request(struct request_queue *q) 447 { 448 while (1) { 449 struct request *req = elv_next_request(q); 450 451 if (!req) 452 break; 453 454 blkdev_dequeue_request(req); 455 if (__send_request(req) < 0) 456 vdc_end_request(req, -EIO, req->hard_nr_sectors); 457 } 458 } 459 460 static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) 461 { 462 struct vio_dring_state *dr; 463 struct vio_completion comp; 464 struct vio_disk_desc *desc; 465 unsigned int map_perm; 466 unsigned long flags; 467 int op_len, err; 468 void *req_buf; 469 470 if (!(((u64)1 << ((u64)op - 1)) & port->operations)) 471 return -EOPNOTSUPP; 472 473 switch (op) { 474 case VD_OP_BREAD: 475 case VD_OP_BWRITE: 476 default: 477 return -EINVAL; 478 479 case VD_OP_FLUSH: 480 op_len = 0; 481 map_perm = 0; 482 break; 483 484 case VD_OP_GET_WCE: 485 op_len = sizeof(u32); 486 map_perm = LDC_MAP_W; 487 break; 488 489 case VD_OP_SET_WCE: 490 op_len = sizeof(u32); 491 map_perm = LDC_MAP_R; 492 break; 493 494 case VD_OP_GET_VTOC: 495 op_len = sizeof(struct vio_disk_vtoc); 496 map_perm = LDC_MAP_W; 497 break; 498 499 case VD_OP_SET_VTOC: 500 op_len = sizeof(struct vio_disk_vtoc); 501 map_perm = LDC_MAP_R; 502 break; 503 504 case VD_OP_GET_DISKGEOM: 505 op_len = sizeof(struct vio_disk_geom); 506 map_perm = LDC_MAP_W; 507 break; 508 509 case VD_OP_SET_DISKGEOM: 510 op_len = sizeof(struct vio_disk_geom); 511 map_perm = LDC_MAP_R; 512 break; 513 514 case VD_OP_SCSICMD: 515 op_len = 16; 516 map_perm = LDC_MAP_RW; 517 break; 518 519 case VD_OP_GET_DEVID: 520 op_len = sizeof(struct vio_disk_devid); 521 map_perm = LDC_MAP_W; 522 break; 523 524 case VD_OP_GET_EFI: 525 case VD_OP_SET_EFI: 526 return -EOPNOTSUPP; 527 break; 528 }; 529 530 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; 531 532 op_len = (op_len + 7) & ~7; 533 req_buf = kzalloc(op_len, GFP_KERNEL); 534 if (!req_buf) 535 return -ENOMEM; 536 537 if (len > op_len) 538 len = op_len; 539 540 if (map_perm & LDC_MAP_R) 541 memcpy(req_buf, buf, len); 542 543 spin_lock_irqsave(&port->vio.lock, flags); 544 545 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 546 547 /* XXX If we want to use this code generically we have to 548 * XXX handle TX ring exhaustion etc. 549 */ 550 desc = vio_dring_cur(dr); 551 552 err = ldc_map_single(port->vio.lp, req_buf, op_len, 553 desc->cookies, port->ring_cookies, 554 map_perm); 555 if (err < 0) { 556 spin_unlock_irqrestore(&port->vio.lock, flags); 557 kfree(req_buf); 558 return err; 559 } 560 561 init_completion(&comp.com); 562 comp.waiting_for = WAITING_FOR_GEN_CMD; 563 port->vio.cmp = ∁ 564 565 desc->hdr.ack = VIO_ACK_ENABLE; 566 desc->req_id = port->req_id; 567 desc->operation = op; 568 desc->slice = 0; 569 desc->status = ~0; 570 desc->offset = 0; 571 desc->size = op_len; 572 desc->ncookies = err; 573 574 /* This has to be a non-SMP write barrier because we are writing 575 * to memory which is shared with the peer LDOM. 576 */ 577 wmb(); 578 desc->hdr.state = VIO_DESC_READY; 579 580 err = __vdc_tx_trigger(port); 581 if (err >= 0) { 582 port->req_id++; 583 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); 584 spin_unlock_irqrestore(&port->vio.lock, flags); 585 586 wait_for_completion(&comp.com); 587 err = comp.err; 588 } else { 589 port->vio.cmp = NULL; 590 spin_unlock_irqrestore(&port->vio.lock, flags); 591 } 592 593 if (map_perm & LDC_MAP_W) 594 memcpy(buf, req_buf, len); 595 596 kfree(req_buf); 597 598 return err; 599 } 600 601 static int __devinit vdc_alloc_tx_ring(struct vdc_port *port) 602 { 603 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 604 unsigned long len, entry_size; 605 int ncookies; 606 void *dring; 607 608 entry_size = sizeof(struct vio_disk_desc) + 609 (sizeof(struct ldc_trans_cookie) * port->ring_cookies); 610 len = (VDC_TX_RING_SIZE * entry_size); 611 612 ncookies = VIO_MAX_RING_COOKIES; 613 dring = ldc_alloc_exp_dring(port->vio.lp, len, 614 dr->cookies, &ncookies, 615 (LDC_MAP_SHADOW | 616 LDC_MAP_DIRECT | 617 LDC_MAP_RW)); 618 if (IS_ERR(dring)) 619 return PTR_ERR(dring); 620 621 dr->base = dring; 622 dr->entry_size = entry_size; 623 dr->num_entries = VDC_TX_RING_SIZE; 624 dr->prod = dr->cons = 0; 625 dr->pending = VDC_TX_RING_SIZE; 626 dr->ncookies = ncookies; 627 628 return 0; 629 } 630 631 static void vdc_free_tx_ring(struct vdc_port *port) 632 { 633 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 634 635 if (dr->base) { 636 ldc_free_exp_dring(port->vio.lp, dr->base, 637 (dr->entry_size * dr->num_entries), 638 dr->cookies, dr->ncookies); 639 dr->base = NULL; 640 dr->entry_size = 0; 641 dr->num_entries = 0; 642 dr->pending = 0; 643 dr->ncookies = 0; 644 } 645 } 646 647 static int probe_disk(struct vdc_port *port) 648 { 649 struct vio_completion comp; 650 struct request_queue *q; 651 struct gendisk *g; 652 int err; 653 654 init_completion(&comp.com); 655 comp.err = 0; 656 comp.waiting_for = WAITING_FOR_LINK_UP; 657 port->vio.cmp = ∁ 658 659 vio_port_up(&port->vio); 660 661 wait_for_completion(&comp.com); 662 if (comp.err) 663 return comp.err; 664 665 err = generic_request(port, VD_OP_GET_VTOC, 666 &port->label, sizeof(port->label)); 667 if (err < 0) { 668 printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err); 669 return err; 670 } 671 672 err = generic_request(port, VD_OP_GET_DISKGEOM, 673 &port->geom, sizeof(port->geom)); 674 if (err < 0) { 675 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " 676 "error %d\n", err); 677 return err; 678 } 679 680 port->vdisk_size = ((u64)port->geom.num_cyl * 681 (u64)port->geom.num_hd * 682 (u64)port->geom.num_sec); 683 684 q = blk_init_queue(do_vdc_request, &port->vio.lock); 685 if (!q) { 686 printk(KERN_ERR PFX "%s: Could not allocate queue.\n", 687 port->vio.name); 688 return -ENOMEM; 689 } 690 g = alloc_disk(1 << PARTITION_SHIFT); 691 if (!g) { 692 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", 693 port->vio.name); 694 blk_cleanup_queue(q); 695 return -ENOMEM; 696 } 697 698 port->disk = g; 699 700 blk_queue_max_hw_segments(q, port->ring_cookies); 701 blk_queue_max_phys_segments(q, port->ring_cookies); 702 blk_queue_max_sectors(q, port->max_xfer_size); 703 g->major = vdc_major; 704 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; 705 strcpy(g->disk_name, port->disk_name); 706 707 g->fops = &vdc_fops; 708 g->queue = q; 709 g->private_data = port; 710 g->driverfs_dev = &port->vio.vdev->dev; 711 712 set_capacity(g, port->vdisk_size); 713 714 printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n", 715 g->disk_name, 716 port->vdisk_size, (port->vdisk_size >> (20 - 9))); 717 718 add_disk(g); 719 720 return 0; 721 } 722 723 static struct ldc_channel_config vdc_ldc_cfg = { 724 .event = vdc_event, 725 .mtu = 64, 726 .mode = LDC_MODE_UNRELIABLE, 727 }; 728 729 static struct vio_driver_ops vdc_vio_ops = { 730 .send_attr = vdc_send_attr, 731 .handle_attr = vdc_handle_attr, 732 .handshake_complete = vdc_handshake_complete, 733 }; 734 735 static void __devinit print_version(void) 736 { 737 static int version_printed; 738 739 if (version_printed++ == 0) 740 printk(KERN_INFO "%s", version); 741 } 742 743 static int __devinit vdc_port_probe(struct vio_dev *vdev, 744 const struct vio_device_id *id) 745 { 746 struct mdesc_handle *hp; 747 struct vdc_port *port; 748 int err; 749 750 print_version(); 751 752 hp = mdesc_grab(); 753 754 err = -ENODEV; 755 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { 756 printk(KERN_ERR PFX "Port id [%lu] too large.\n", 757 vdev->dev_no); 758 goto err_out_release_mdesc; 759 } 760 761 port = kzalloc(sizeof(*port), GFP_KERNEL); 762 err = -ENOMEM; 763 if (!port) { 764 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); 765 goto err_out_release_mdesc; 766 } 767 768 if (vdev->dev_no >= 26) 769 snprintf(port->disk_name, sizeof(port->disk_name), 770 VDCBLK_NAME "%c%c", 771 'a' + ((int)vdev->dev_no / 26) - 1, 772 'a' + ((int)vdev->dev_no % 26)); 773 else 774 snprintf(port->disk_name, sizeof(port->disk_name), 775 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); 776 777 err = vio_driver_init(&port->vio, vdev, VDEV_DISK, 778 vdc_versions, ARRAY_SIZE(vdc_versions), 779 &vdc_vio_ops, port->disk_name); 780 if (err) 781 goto err_out_free_port; 782 783 port->vdisk_block_size = 512; 784 port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size); 785 port->ring_cookies = ((port->max_xfer_size * 786 port->vdisk_block_size) / PAGE_SIZE) + 2; 787 788 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); 789 if (err) 790 goto err_out_free_port; 791 792 err = vdc_alloc_tx_ring(port); 793 if (err) 794 goto err_out_free_ldc; 795 796 err = probe_disk(port); 797 if (err) 798 goto err_out_free_tx_ring; 799 800 dev_set_drvdata(&vdev->dev, port); 801 802 mdesc_release(hp); 803 804 return 0; 805 806 err_out_free_tx_ring: 807 vdc_free_tx_ring(port); 808 809 err_out_free_ldc: 810 vio_ldc_free(&port->vio); 811 812 err_out_free_port: 813 kfree(port); 814 815 err_out_release_mdesc: 816 mdesc_release(hp); 817 return err; 818 } 819 820 static int vdc_port_remove(struct vio_dev *vdev) 821 { 822 struct vdc_port *port = dev_get_drvdata(&vdev->dev); 823 824 if (port) { 825 del_timer_sync(&port->vio.timer); 826 827 vdc_free_tx_ring(port); 828 vio_ldc_free(&port->vio); 829 830 dev_set_drvdata(&vdev->dev, NULL); 831 832 kfree(port); 833 } 834 return 0; 835 } 836 837 static struct vio_device_id vdc_port_match[] = { 838 { 839 .type = "vdc-port", 840 }, 841 {}, 842 }; 843 MODULE_DEVICE_TABLE(vio, vdc_port_match); 844 845 static struct vio_driver vdc_port_driver = { 846 .id_table = vdc_port_match, 847 .probe = vdc_port_probe, 848 .remove = vdc_port_remove, 849 .driver = { 850 .name = "vdc_port", 851 .owner = THIS_MODULE, 852 } 853 }; 854 855 static int __init vdc_init(void) 856 { 857 int err; 858 859 err = register_blkdev(0, VDCBLK_NAME); 860 if (err < 0) 861 goto out_err; 862 863 vdc_major = err; 864 865 err = vio_register_driver(&vdc_port_driver); 866 if (err) 867 goto out_unregister_blkdev; 868 869 return 0; 870 871 out_unregister_blkdev: 872 unregister_blkdev(vdc_major, VDCBLK_NAME); 873 vdc_major = 0; 874 875 out_err: 876 return err; 877 } 878 879 static void __exit vdc_exit(void) 880 { 881 vio_unregister_driver(&vdc_port_driver); 882 unregister_blkdev(vdc_major, VDCBLK_NAME); 883 } 884 885 module_init(vdc_init); 886 module_exit(vdc_exit); 887