1 /* sunvdc.c: Sun LDOM Virtual Disk Client. 2 * 3 * Copyright (C) 2007, 2008 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 const 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[%llu]\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[%llx] disk_size[%llu] disk_type[%x] " 168 "xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\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_one(struct vdc_port *port, struct vio_dring_state *dr, 216 unsigned int index) 217 { 218 struct vio_disk_desc *desc = vio_dring_entry(dr, index); 219 struct vdc_req_entry *rqe = &port->rq_arr[index]; 220 struct request *req; 221 222 if (unlikely(desc->hdr.state != VIO_DESC_DONE)) 223 return; 224 225 ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); 226 desc->hdr.state = VIO_DESC_FREE; 227 dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1); 228 229 req = rqe->req; 230 if (req == NULL) { 231 vdc_end_special(port, desc); 232 return; 233 } 234 235 rqe->req = NULL; 236 237 __blk_end_request(req, (desc->status ? -EIO : 0), desc->size); 238 239 if (blk_queue_stopped(port->disk->queue)) 240 blk_start_queue(port->disk->queue); 241 } 242 243 static int vdc_ack(struct vdc_port *port, void *msgbuf) 244 { 245 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 246 struct vio_dring_data *pkt = msgbuf; 247 248 if (unlikely(pkt->dring_ident != dr->ident || 249 pkt->start_idx != pkt->end_idx || 250 pkt->start_idx >= VDC_TX_RING_SIZE)) 251 return 0; 252 253 vdc_end_one(port, dr, pkt->start_idx); 254 255 return 0; 256 } 257 258 static int vdc_nack(struct vdc_port *port, void *msgbuf) 259 { 260 /* XXX Implement me XXX */ 261 return 0; 262 } 263 264 static void vdc_event(void *arg, int event) 265 { 266 struct vdc_port *port = arg; 267 struct vio_driver_state *vio = &port->vio; 268 unsigned long flags; 269 int err; 270 271 spin_lock_irqsave(&vio->lock, flags); 272 273 if (unlikely(event == LDC_EVENT_RESET || 274 event == LDC_EVENT_UP)) { 275 vio_link_state_change(vio, event); 276 spin_unlock_irqrestore(&vio->lock, flags); 277 return; 278 } 279 280 if (unlikely(event != LDC_EVENT_DATA_READY)) { 281 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event); 282 spin_unlock_irqrestore(&vio->lock, flags); 283 return; 284 } 285 286 err = 0; 287 while (1) { 288 union { 289 struct vio_msg_tag tag; 290 u64 raw[8]; 291 } msgbuf; 292 293 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); 294 if (unlikely(err < 0)) { 295 if (err == -ECONNRESET) 296 vio_conn_reset(vio); 297 break; 298 } 299 if (err == 0) 300 break; 301 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", 302 msgbuf.tag.type, 303 msgbuf.tag.stype, 304 msgbuf.tag.stype_env, 305 msgbuf.tag.sid); 306 err = vio_validate_sid(vio, &msgbuf.tag); 307 if (err < 0) 308 break; 309 310 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { 311 if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) 312 err = vdc_ack(port, &msgbuf); 313 else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) 314 err = vdc_nack(port, &msgbuf); 315 else 316 err = vdc_handle_unknown(port, &msgbuf); 317 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { 318 err = vio_control_pkt_engine(vio, &msgbuf); 319 } else { 320 err = vdc_handle_unknown(port, &msgbuf); 321 } 322 if (err < 0) 323 break; 324 } 325 if (err < 0) 326 vdc_finish(&port->vio, err, WAITING_FOR_ANY); 327 spin_unlock_irqrestore(&vio->lock, flags); 328 } 329 330 static int __vdc_tx_trigger(struct vdc_port *port) 331 { 332 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 333 struct vio_dring_data hdr = { 334 .tag = { 335 .type = VIO_TYPE_DATA, 336 .stype = VIO_SUBTYPE_INFO, 337 .stype_env = VIO_DRING_DATA, 338 .sid = vio_send_sid(&port->vio), 339 }, 340 .dring_ident = dr->ident, 341 .start_idx = dr->prod, 342 .end_idx = dr->prod, 343 }; 344 int err, delay; 345 346 hdr.seq = dr->snd_nxt; 347 delay = 1; 348 do { 349 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); 350 if (err > 0) { 351 dr->snd_nxt++; 352 break; 353 } 354 udelay(delay); 355 if ((delay <<= 1) > 128) 356 delay = 128; 357 } while (err == -EAGAIN); 358 359 return err; 360 } 361 362 static int __send_request(struct request *req) 363 { 364 struct vdc_port *port = req->rq_disk->private_data; 365 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 366 struct scatterlist sg[port->ring_cookies]; 367 struct vdc_req_entry *rqe; 368 struct vio_disk_desc *desc; 369 unsigned int map_perm; 370 int nsg, err, i; 371 u64 len; 372 u8 op; 373 374 map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; 375 376 if (rq_data_dir(req) == READ) { 377 map_perm |= LDC_MAP_W; 378 op = VD_OP_BREAD; 379 } else { 380 map_perm |= LDC_MAP_R; 381 op = VD_OP_BWRITE; 382 } 383 384 sg_init_table(sg, port->ring_cookies); 385 nsg = blk_rq_map_sg(req->q, req, sg); 386 387 len = 0; 388 for (i = 0; i < nsg; i++) 389 len += sg[i].length; 390 391 if (unlikely(vdc_tx_dring_avail(dr) < 1)) { 392 blk_stop_queue(port->disk->queue); 393 err = -ENOMEM; 394 goto out; 395 } 396 397 desc = vio_dring_cur(dr); 398 399 err = ldc_map_sg(port->vio.lp, sg, nsg, 400 desc->cookies, port->ring_cookies, 401 map_perm); 402 if (err < 0) { 403 printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); 404 return err; 405 } 406 407 rqe = &port->rq_arr[dr->prod]; 408 rqe->req = req; 409 410 desc->hdr.ack = VIO_ACK_ENABLE; 411 desc->req_id = port->req_id; 412 desc->operation = op; 413 if (port->vdisk_type == VD_DISK_TYPE_DISK) { 414 desc->slice = 0xff; 415 } else { 416 desc->slice = 0; 417 } 418 desc->status = ~0; 419 desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size; 420 desc->size = len; 421 desc->ncookies = err; 422 423 /* This has to be a non-SMP write barrier because we are writing 424 * to memory which is shared with the peer LDOM. 425 */ 426 wmb(); 427 desc->hdr.state = VIO_DESC_READY; 428 429 err = __vdc_tx_trigger(port); 430 if (err < 0) { 431 printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); 432 } else { 433 port->req_id++; 434 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); 435 } 436 out: 437 438 return err; 439 } 440 441 static void do_vdc_request(struct request_queue *q) 442 { 443 while (1) { 444 struct request *req = blk_fetch_request(q); 445 446 if (!req) 447 break; 448 449 if (__send_request(req) < 0) 450 __blk_end_request_all(req, -EIO); 451 } 452 } 453 454 static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) 455 { 456 struct vio_dring_state *dr; 457 struct vio_completion comp; 458 struct vio_disk_desc *desc; 459 unsigned int map_perm; 460 unsigned long flags; 461 int op_len, err; 462 void *req_buf; 463 464 if (!(((u64)1 << ((u64)op - 1)) & port->operations)) 465 return -EOPNOTSUPP; 466 467 switch (op) { 468 case VD_OP_BREAD: 469 case VD_OP_BWRITE: 470 default: 471 return -EINVAL; 472 473 case VD_OP_FLUSH: 474 op_len = 0; 475 map_perm = 0; 476 break; 477 478 case VD_OP_GET_WCE: 479 op_len = sizeof(u32); 480 map_perm = LDC_MAP_W; 481 break; 482 483 case VD_OP_SET_WCE: 484 op_len = sizeof(u32); 485 map_perm = LDC_MAP_R; 486 break; 487 488 case VD_OP_GET_VTOC: 489 op_len = sizeof(struct vio_disk_vtoc); 490 map_perm = LDC_MAP_W; 491 break; 492 493 case VD_OP_SET_VTOC: 494 op_len = sizeof(struct vio_disk_vtoc); 495 map_perm = LDC_MAP_R; 496 break; 497 498 case VD_OP_GET_DISKGEOM: 499 op_len = sizeof(struct vio_disk_geom); 500 map_perm = LDC_MAP_W; 501 break; 502 503 case VD_OP_SET_DISKGEOM: 504 op_len = sizeof(struct vio_disk_geom); 505 map_perm = LDC_MAP_R; 506 break; 507 508 case VD_OP_SCSICMD: 509 op_len = 16; 510 map_perm = LDC_MAP_RW; 511 break; 512 513 case VD_OP_GET_DEVID: 514 op_len = sizeof(struct vio_disk_devid); 515 map_perm = LDC_MAP_W; 516 break; 517 518 case VD_OP_GET_EFI: 519 case VD_OP_SET_EFI: 520 return -EOPNOTSUPP; 521 break; 522 }; 523 524 map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; 525 526 op_len = (op_len + 7) & ~7; 527 req_buf = kzalloc(op_len, GFP_KERNEL); 528 if (!req_buf) 529 return -ENOMEM; 530 531 if (len > op_len) 532 len = op_len; 533 534 if (map_perm & LDC_MAP_R) 535 memcpy(req_buf, buf, len); 536 537 spin_lock_irqsave(&port->vio.lock, flags); 538 539 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 540 541 /* XXX If we want to use this code generically we have to 542 * XXX handle TX ring exhaustion etc. 543 */ 544 desc = vio_dring_cur(dr); 545 546 err = ldc_map_single(port->vio.lp, req_buf, op_len, 547 desc->cookies, port->ring_cookies, 548 map_perm); 549 if (err < 0) { 550 spin_unlock_irqrestore(&port->vio.lock, flags); 551 kfree(req_buf); 552 return err; 553 } 554 555 init_completion(&comp.com); 556 comp.waiting_for = WAITING_FOR_GEN_CMD; 557 port->vio.cmp = ∁ 558 559 desc->hdr.ack = VIO_ACK_ENABLE; 560 desc->req_id = port->req_id; 561 desc->operation = op; 562 desc->slice = 0; 563 desc->status = ~0; 564 desc->offset = 0; 565 desc->size = op_len; 566 desc->ncookies = err; 567 568 /* This has to be a non-SMP write barrier because we are writing 569 * to memory which is shared with the peer LDOM. 570 */ 571 wmb(); 572 desc->hdr.state = VIO_DESC_READY; 573 574 err = __vdc_tx_trigger(port); 575 if (err >= 0) { 576 port->req_id++; 577 dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); 578 spin_unlock_irqrestore(&port->vio.lock, flags); 579 580 wait_for_completion(&comp.com); 581 err = comp.err; 582 } else { 583 port->vio.cmp = NULL; 584 spin_unlock_irqrestore(&port->vio.lock, flags); 585 } 586 587 if (map_perm & LDC_MAP_W) 588 memcpy(buf, req_buf, len); 589 590 kfree(req_buf); 591 592 return err; 593 } 594 595 static int __devinit vdc_alloc_tx_ring(struct vdc_port *port) 596 { 597 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 598 unsigned long len, entry_size; 599 int ncookies; 600 void *dring; 601 602 entry_size = sizeof(struct vio_disk_desc) + 603 (sizeof(struct ldc_trans_cookie) * port->ring_cookies); 604 len = (VDC_TX_RING_SIZE * entry_size); 605 606 ncookies = VIO_MAX_RING_COOKIES; 607 dring = ldc_alloc_exp_dring(port->vio.lp, len, 608 dr->cookies, &ncookies, 609 (LDC_MAP_SHADOW | 610 LDC_MAP_DIRECT | 611 LDC_MAP_RW)); 612 if (IS_ERR(dring)) 613 return PTR_ERR(dring); 614 615 dr->base = dring; 616 dr->entry_size = entry_size; 617 dr->num_entries = VDC_TX_RING_SIZE; 618 dr->prod = dr->cons = 0; 619 dr->pending = VDC_TX_RING_SIZE; 620 dr->ncookies = ncookies; 621 622 return 0; 623 } 624 625 static void vdc_free_tx_ring(struct vdc_port *port) 626 { 627 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 628 629 if (dr->base) { 630 ldc_free_exp_dring(port->vio.lp, dr->base, 631 (dr->entry_size * dr->num_entries), 632 dr->cookies, dr->ncookies); 633 dr->base = NULL; 634 dr->entry_size = 0; 635 dr->num_entries = 0; 636 dr->pending = 0; 637 dr->ncookies = 0; 638 } 639 } 640 641 static int probe_disk(struct vdc_port *port) 642 { 643 struct vio_completion comp; 644 struct request_queue *q; 645 struct gendisk *g; 646 int err; 647 648 init_completion(&comp.com); 649 comp.err = 0; 650 comp.waiting_for = WAITING_FOR_LINK_UP; 651 port->vio.cmp = ∁ 652 653 vio_port_up(&port->vio); 654 655 wait_for_completion(&comp.com); 656 if (comp.err) 657 return comp.err; 658 659 err = generic_request(port, VD_OP_GET_VTOC, 660 &port->label, sizeof(port->label)); 661 if (err < 0) { 662 printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err); 663 return err; 664 } 665 666 err = generic_request(port, VD_OP_GET_DISKGEOM, 667 &port->geom, sizeof(port->geom)); 668 if (err < 0) { 669 printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " 670 "error %d\n", err); 671 return err; 672 } 673 674 port->vdisk_size = ((u64)port->geom.num_cyl * 675 (u64)port->geom.num_hd * 676 (u64)port->geom.num_sec); 677 678 q = blk_init_queue(do_vdc_request, &port->vio.lock); 679 if (!q) { 680 printk(KERN_ERR PFX "%s: Could not allocate queue.\n", 681 port->vio.name); 682 return -ENOMEM; 683 } 684 g = alloc_disk(1 << PARTITION_SHIFT); 685 if (!g) { 686 printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", 687 port->vio.name); 688 blk_cleanup_queue(q); 689 return -ENOMEM; 690 } 691 692 port->disk = g; 693 694 blk_queue_max_segments(q, port->ring_cookies); 695 blk_queue_max_hw_sectors(q, port->max_xfer_size); 696 g->major = vdc_major; 697 g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; 698 strcpy(g->disk_name, port->disk_name); 699 700 g->fops = &vdc_fops; 701 g->queue = q; 702 g->private_data = port; 703 g->driverfs_dev = &port->vio.vdev->dev; 704 705 set_capacity(g, port->vdisk_size); 706 707 printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n", 708 g->disk_name, 709 port->vdisk_size, (port->vdisk_size >> (20 - 9))); 710 711 add_disk(g); 712 713 return 0; 714 } 715 716 static struct ldc_channel_config vdc_ldc_cfg = { 717 .event = vdc_event, 718 .mtu = 64, 719 .mode = LDC_MODE_UNRELIABLE, 720 }; 721 722 static struct vio_driver_ops vdc_vio_ops = { 723 .send_attr = vdc_send_attr, 724 .handle_attr = vdc_handle_attr, 725 .handshake_complete = vdc_handshake_complete, 726 }; 727 728 static void __devinit print_version(void) 729 { 730 static int version_printed; 731 732 if (version_printed++ == 0) 733 printk(KERN_INFO "%s", version); 734 } 735 736 static int __devinit vdc_port_probe(struct vio_dev *vdev, 737 const struct vio_device_id *id) 738 { 739 struct mdesc_handle *hp; 740 struct vdc_port *port; 741 int err; 742 743 print_version(); 744 745 hp = mdesc_grab(); 746 747 err = -ENODEV; 748 if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { 749 printk(KERN_ERR PFX "Port id [%llu] too large.\n", 750 vdev->dev_no); 751 goto err_out_release_mdesc; 752 } 753 754 port = kzalloc(sizeof(*port), GFP_KERNEL); 755 err = -ENOMEM; 756 if (!port) { 757 printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); 758 goto err_out_release_mdesc; 759 } 760 761 if (vdev->dev_no >= 26) 762 snprintf(port->disk_name, sizeof(port->disk_name), 763 VDCBLK_NAME "%c%c", 764 'a' + ((int)vdev->dev_no / 26) - 1, 765 'a' + ((int)vdev->dev_no % 26)); 766 else 767 snprintf(port->disk_name, sizeof(port->disk_name), 768 VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); 769 770 err = vio_driver_init(&port->vio, vdev, VDEV_DISK, 771 vdc_versions, ARRAY_SIZE(vdc_versions), 772 &vdc_vio_ops, port->disk_name); 773 if (err) 774 goto err_out_free_port; 775 776 port->vdisk_block_size = 512; 777 port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size); 778 port->ring_cookies = ((port->max_xfer_size * 779 port->vdisk_block_size) / PAGE_SIZE) + 2; 780 781 err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); 782 if (err) 783 goto err_out_free_port; 784 785 err = vdc_alloc_tx_ring(port); 786 if (err) 787 goto err_out_free_ldc; 788 789 err = probe_disk(port); 790 if (err) 791 goto err_out_free_tx_ring; 792 793 dev_set_drvdata(&vdev->dev, port); 794 795 mdesc_release(hp); 796 797 return 0; 798 799 err_out_free_tx_ring: 800 vdc_free_tx_ring(port); 801 802 err_out_free_ldc: 803 vio_ldc_free(&port->vio); 804 805 err_out_free_port: 806 kfree(port); 807 808 err_out_release_mdesc: 809 mdesc_release(hp); 810 return err; 811 } 812 813 static int vdc_port_remove(struct vio_dev *vdev) 814 { 815 struct vdc_port *port = dev_get_drvdata(&vdev->dev); 816 817 if (port) { 818 del_timer_sync(&port->vio.timer); 819 820 vdc_free_tx_ring(port); 821 vio_ldc_free(&port->vio); 822 823 dev_set_drvdata(&vdev->dev, NULL); 824 825 kfree(port); 826 } 827 return 0; 828 } 829 830 static const struct vio_device_id vdc_port_match[] = { 831 { 832 .type = "vdc-port", 833 }, 834 {}, 835 }; 836 MODULE_DEVICE_TABLE(vio, vdc_port_match); 837 838 static struct vio_driver vdc_port_driver = { 839 .id_table = vdc_port_match, 840 .probe = vdc_port_probe, 841 .remove = vdc_port_remove, 842 .driver = { 843 .name = "vdc_port", 844 .owner = THIS_MODULE, 845 } 846 }; 847 848 static int __init vdc_init(void) 849 { 850 int err; 851 852 err = register_blkdev(0, VDCBLK_NAME); 853 if (err < 0) 854 goto out_err; 855 856 vdc_major = err; 857 858 err = vio_register_driver(&vdc_port_driver); 859 if (err) 860 goto out_unregister_blkdev; 861 862 return 0; 863 864 out_unregister_blkdev: 865 unregister_blkdev(vdc_major, VDCBLK_NAME); 866 vdc_major = 0; 867 868 out_err: 869 return err; 870 } 871 872 static void __exit vdc_exit(void) 873 { 874 vio_unregister_driver(&vdc_port_driver); 875 unregister_blkdev(vdc_major, VDCBLK_NAME); 876 } 877 878 module_init(vdc_init); 879 module_exit(vdc_exit); 880