1 /* 2 * Copyright (c) 2009, Microsoft Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 15 * Place - Suite 330, Boston, MA 02111-1307 USA. 16 * 17 * Authors: 18 * Haiyang Zhang <haiyangz@microsoft.com> 19 * Hank Janssen <hjanssen@microsoft.com> 20 * K. Y. Srinivasan <kys@microsoft.com> 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/wait.h> 25 #include <linux/sched.h> 26 #include <linux/completion.h> 27 #include <linux/string.h> 28 #include <linux/mm.h> 29 #include <linux/delay.h> 30 #include <linux/init.h> 31 #include <linux/slab.h> 32 #include <linux/module.h> 33 #include <linux/device.h> 34 #include <linux/hyperv.h> 35 #include <linux/mempool.h> 36 #include <scsi/scsi.h> 37 #include <scsi/scsi_cmnd.h> 38 #include <scsi/scsi_host.h> 39 #include <scsi/scsi_device.h> 40 #include <scsi/scsi_tcq.h> 41 #include <scsi/scsi_eh.h> 42 #include <scsi/scsi_devinfo.h> 43 #include <scsi/scsi_dbg.h> 44 45 /* 46 * All wire protocol details (storage protocol between the guest and the host) 47 * are consolidated here. 48 * 49 * Begin protocol definitions. 50 */ 51 52 /* 53 * Version history: 54 * V1 Beta: 0.1 55 * V1 RC < 2008/1/31: 1.0 56 * V1 RC > 2008/1/31: 2.0 57 * Win7: 4.2 58 */ 59 60 #define VMSTOR_CURRENT_MAJOR 4 61 #define VMSTOR_CURRENT_MINOR 2 62 63 64 /* Packet structure describing virtual storage requests. */ 65 enum vstor_packet_operation { 66 VSTOR_OPERATION_COMPLETE_IO = 1, 67 VSTOR_OPERATION_REMOVE_DEVICE = 2, 68 VSTOR_OPERATION_EXECUTE_SRB = 3, 69 VSTOR_OPERATION_RESET_LUN = 4, 70 VSTOR_OPERATION_RESET_ADAPTER = 5, 71 VSTOR_OPERATION_RESET_BUS = 6, 72 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, 73 VSTOR_OPERATION_END_INITIALIZATION = 8, 74 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, 75 VSTOR_OPERATION_QUERY_PROPERTIES = 10, 76 VSTOR_OPERATION_ENUMERATE_BUS = 11, 77 VSTOR_OPERATION_MAXIMUM = 11 78 }; 79 80 /* 81 * Platform neutral description of a scsi request - 82 * this remains the same across the write regardless of 32/64 bit 83 * note: it's patterned off the SCSI_PASS_THROUGH structure 84 */ 85 #define STORVSC_MAX_CMD_LEN 0x10 86 #define STORVSC_SENSE_BUFFER_SIZE 0x12 87 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 88 89 struct vmscsi_request { 90 u16 length; 91 u8 srb_status; 92 u8 scsi_status; 93 94 u8 port_number; 95 u8 path_id; 96 u8 target_id; 97 u8 lun; 98 99 u8 cdb_length; 100 u8 sense_info_length; 101 u8 data_in; 102 u8 reserved; 103 104 u32 data_transfer_length; 105 106 union { 107 u8 cdb[STORVSC_MAX_CMD_LEN]; 108 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; 109 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; 110 }; 111 } __attribute((packed)); 112 113 114 /* 115 * This structure is sent during the intialization phase to get the different 116 * properties of the channel. 117 */ 118 struct vmstorage_channel_properties { 119 u16 protocol_version; 120 u8 path_id; 121 u8 target_id; 122 123 /* Note: port number is only really known on the client side */ 124 u32 port_number; 125 u32 flags; 126 u32 max_transfer_bytes; 127 128 /* 129 * This id is unique for each channel and will correspond with 130 * vendor specific data in the inquiry data. 131 */ 132 133 u64 unique_id; 134 } __packed; 135 136 /* This structure is sent during the storage protocol negotiations. */ 137 struct vmstorage_protocol_version { 138 /* Major (MSW) and minor (LSW) version numbers. */ 139 u16 major_minor; 140 141 /* 142 * Revision number is auto-incremented whenever this file is changed 143 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 144 * definitely indicate incompatibility--but it does indicate mismatched 145 * builds. 146 * This is only used on the windows side. Just set it to 0. 147 */ 148 u16 revision; 149 } __packed; 150 151 /* Channel Property Flags */ 152 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 153 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 154 155 struct vstor_packet { 156 /* Requested operation type */ 157 enum vstor_packet_operation operation; 158 159 /* Flags - see below for values */ 160 u32 flags; 161 162 /* Status of the request returned from the server side. */ 163 u32 status; 164 165 /* Data payload area */ 166 union { 167 /* 168 * Structure used to forward SCSI commands from the 169 * client to the server. 170 */ 171 struct vmscsi_request vm_srb; 172 173 /* Structure used to query channel properties. */ 174 struct vmstorage_channel_properties storage_channel_properties; 175 176 /* Used during version negotiations. */ 177 struct vmstorage_protocol_version version; 178 }; 179 } __packed; 180 181 /* 182 * Packet Flags: 183 * 184 * This flag indicates that the server should send back a completion for this 185 * packet. 186 */ 187 188 #define REQUEST_COMPLETION_FLAG 0x1 189 190 /* Matches Windows-end */ 191 enum storvsc_request_type { 192 WRITE_TYPE = 0, 193 READ_TYPE, 194 UNKNOWN_TYPE, 195 }; 196 197 /* 198 * SRB status codes and masks; a subset of the codes used here. 199 */ 200 201 #define SRB_STATUS_AUTOSENSE_VALID 0x80 202 #define SRB_STATUS_INVALID_LUN 0x20 203 #define SRB_STATUS_SUCCESS 0x01 204 #define SRB_STATUS_ERROR 0x04 205 206 /* 207 * This is the end of Protocol specific defines. 208 */ 209 210 211 /* 212 * We setup a mempool to allocate request structures for this driver 213 * on a per-lun basis. The following define specifies the number of 214 * elements in the pool. 215 */ 216 217 #define STORVSC_MIN_BUF_NR 64 218 static int storvsc_ringbuffer_size = (20 * PAGE_SIZE); 219 220 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 221 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 222 223 #define STORVSC_MAX_IO_REQUESTS 128 224 225 /* 226 * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In 227 * reality, the path/target is not used (ie always set to 0) so our 228 * scsi host adapter essentially has 1 bus with 1 target that contains 229 * up to 256 luns. 230 */ 231 #define STORVSC_MAX_LUNS_PER_TARGET 64 232 #define STORVSC_MAX_TARGETS 1 233 #define STORVSC_MAX_CHANNELS 1 234 235 236 237 struct storvsc_cmd_request { 238 struct list_head entry; 239 struct scsi_cmnd *cmd; 240 241 unsigned int bounce_sgl_count; 242 struct scatterlist *bounce_sgl; 243 244 struct hv_device *device; 245 246 /* Synchronize the request/response if needed */ 247 struct completion wait_event; 248 249 unsigned char *sense_buffer; 250 struct hv_multipage_buffer data_buffer; 251 struct vstor_packet vstor_packet; 252 }; 253 254 255 /* A storvsc device is a device object that contains a vmbus channel */ 256 struct storvsc_device { 257 struct hv_device *device; 258 259 bool destroy; 260 bool drain_notify; 261 atomic_t num_outstanding_req; 262 struct Scsi_Host *host; 263 264 wait_queue_head_t waiting_to_drain; 265 266 /* 267 * Each unique Port/Path/Target represents 1 channel ie scsi 268 * controller. In reality, the pathid, targetid is always 0 269 * and the port is set by us 270 */ 271 unsigned int port_number; 272 unsigned char path_id; 273 unsigned char target_id; 274 275 /* Used for vsc/vsp channel reset process */ 276 struct storvsc_cmd_request init_request; 277 struct storvsc_cmd_request reset_request; 278 }; 279 280 struct stor_mem_pools { 281 struct kmem_cache *request_pool; 282 mempool_t *request_mempool; 283 }; 284 285 struct hv_host_device { 286 struct hv_device *dev; 287 unsigned int port; 288 unsigned char path; 289 unsigned char target; 290 }; 291 292 struct storvsc_scan_work { 293 struct work_struct work; 294 struct Scsi_Host *host; 295 uint lun; 296 }; 297 298 static void storvsc_bus_scan(struct work_struct *work) 299 { 300 struct storvsc_scan_work *wrk; 301 int id, order_id; 302 303 wrk = container_of(work, struct storvsc_scan_work, work); 304 for (id = 0; id < wrk->host->max_id; ++id) { 305 if (wrk->host->reverse_ordering) 306 order_id = wrk->host->max_id - id - 1; 307 else 308 order_id = id; 309 310 scsi_scan_target(&wrk->host->shost_gendev, 0, 311 order_id, SCAN_WILD_CARD, 1); 312 } 313 kfree(wrk); 314 } 315 316 static void storvsc_remove_lun(struct work_struct *work) 317 { 318 struct storvsc_scan_work *wrk; 319 struct scsi_device *sdev; 320 321 wrk = container_of(work, struct storvsc_scan_work, work); 322 if (!scsi_host_get(wrk->host)) 323 goto done; 324 325 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); 326 327 if (sdev) { 328 scsi_remove_device(sdev); 329 scsi_device_put(sdev); 330 } 331 scsi_host_put(wrk->host); 332 333 done: 334 kfree(wrk); 335 } 336 337 /* 338 * Major/minor macros. Minor version is in LSB, meaning that earlier flat 339 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). 340 */ 341 342 static inline u16 storvsc_get_version(u8 major, u8 minor) 343 { 344 u16 version; 345 346 version = ((major << 8) | minor); 347 return version; 348 } 349 350 /* 351 * We can get incoming messages from the host that are not in response to 352 * messages that we have sent out. An example of this would be messages 353 * received by the guest to notify dynamic addition/removal of LUNs. To 354 * deal with potential race conditions where the driver may be in the 355 * midst of being unloaded when we might receive an unsolicited message 356 * from the host, we have implemented a mechanism to gurantee sequential 357 * consistency: 358 * 359 * 1) Once the device is marked as being destroyed, we will fail all 360 * outgoing messages. 361 * 2) We permit incoming messages when the device is being destroyed, 362 * only to properly account for messages already sent out. 363 */ 364 365 static inline struct storvsc_device *get_out_stor_device( 366 struct hv_device *device) 367 { 368 struct storvsc_device *stor_device; 369 370 stor_device = hv_get_drvdata(device); 371 372 if (stor_device && stor_device->destroy) 373 stor_device = NULL; 374 375 return stor_device; 376 } 377 378 379 static inline void storvsc_wait_to_drain(struct storvsc_device *dev) 380 { 381 dev->drain_notify = true; 382 wait_event(dev->waiting_to_drain, 383 atomic_read(&dev->num_outstanding_req) == 0); 384 dev->drain_notify = false; 385 } 386 387 static inline struct storvsc_device *get_in_stor_device( 388 struct hv_device *device) 389 { 390 struct storvsc_device *stor_device; 391 392 stor_device = hv_get_drvdata(device); 393 394 if (!stor_device) 395 goto get_in_err; 396 397 /* 398 * If the device is being destroyed; allow incoming 399 * traffic only to cleanup outstanding requests. 400 */ 401 402 if (stor_device->destroy && 403 (atomic_read(&stor_device->num_outstanding_req) == 0)) 404 stor_device = NULL; 405 406 get_in_err: 407 return stor_device; 408 409 } 410 411 static void destroy_bounce_buffer(struct scatterlist *sgl, 412 unsigned int sg_count) 413 { 414 int i; 415 struct page *page_buf; 416 417 for (i = 0; i < sg_count; i++) { 418 page_buf = sg_page((&sgl[i])); 419 if (page_buf != NULL) 420 __free_page(page_buf); 421 } 422 423 kfree(sgl); 424 } 425 426 static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) 427 { 428 int i; 429 430 /* No need to check */ 431 if (sg_count < 2) 432 return -1; 433 434 /* We have at least 2 sg entries */ 435 for (i = 0; i < sg_count; i++) { 436 if (i == 0) { 437 /* make sure 1st one does not have hole */ 438 if (sgl[i].offset + sgl[i].length != PAGE_SIZE) 439 return i; 440 } else if (i == sg_count - 1) { 441 /* make sure last one does not have hole */ 442 if (sgl[i].offset != 0) 443 return i; 444 } else { 445 /* make sure no hole in the middle */ 446 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) 447 return i; 448 } 449 } 450 return -1; 451 } 452 453 static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, 454 unsigned int sg_count, 455 unsigned int len, 456 int write) 457 { 458 int i; 459 int num_pages; 460 struct scatterlist *bounce_sgl; 461 struct page *page_buf; 462 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); 463 464 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; 465 466 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); 467 if (!bounce_sgl) 468 return NULL; 469 470 for (i = 0; i < num_pages; i++) { 471 page_buf = alloc_page(GFP_ATOMIC); 472 if (!page_buf) 473 goto cleanup; 474 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); 475 } 476 477 return bounce_sgl; 478 479 cleanup: 480 destroy_bounce_buffer(bounce_sgl, num_pages); 481 return NULL; 482 } 483 484 /* Disgusting wrapper functions */ 485 static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx) 486 { 487 void *addr = kmap_atomic(sg_page(sgl + idx)); 488 return (unsigned long)addr; 489 } 490 491 static inline void sg_kunmap_atomic(unsigned long addr) 492 { 493 kunmap_atomic((void *)addr); 494 } 495 496 497 /* Assume the original sgl has enough room */ 498 static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, 499 struct scatterlist *bounce_sgl, 500 unsigned int orig_sgl_count, 501 unsigned int bounce_sgl_count) 502 { 503 int i; 504 int j = 0; 505 unsigned long src, dest; 506 unsigned int srclen, destlen, copylen; 507 unsigned int total_copied = 0; 508 unsigned long bounce_addr = 0; 509 unsigned long dest_addr = 0; 510 unsigned long flags; 511 512 local_irq_save(flags); 513 514 for (i = 0; i < orig_sgl_count; i++) { 515 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; 516 dest = dest_addr; 517 destlen = orig_sgl[i].length; 518 519 if (bounce_addr == 0) 520 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 521 522 while (destlen) { 523 src = bounce_addr + bounce_sgl[j].offset; 524 srclen = bounce_sgl[j].length - bounce_sgl[j].offset; 525 526 copylen = min(srclen, destlen); 527 memcpy((void *)dest, (void *)src, copylen); 528 529 total_copied += copylen; 530 bounce_sgl[j].offset += copylen; 531 destlen -= copylen; 532 dest += copylen; 533 534 if (bounce_sgl[j].offset == bounce_sgl[j].length) { 535 /* full */ 536 sg_kunmap_atomic(bounce_addr); 537 j++; 538 539 /* 540 * It is possible that the number of elements 541 * in the bounce buffer may not be equal to 542 * the number of elements in the original 543 * scatter list. Handle this correctly. 544 */ 545 546 if (j == bounce_sgl_count) { 547 /* 548 * We are done; cleanup and return. 549 */ 550 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); 551 local_irq_restore(flags); 552 return total_copied; 553 } 554 555 /* if we need to use another bounce buffer */ 556 if (destlen || i != orig_sgl_count - 1) 557 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 558 } else if (destlen == 0 && i == orig_sgl_count - 1) { 559 /* unmap the last bounce that is < PAGE_SIZE */ 560 sg_kunmap_atomic(bounce_addr); 561 } 562 } 563 564 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); 565 } 566 567 local_irq_restore(flags); 568 569 return total_copied; 570 } 571 572 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ 573 static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, 574 struct scatterlist *bounce_sgl, 575 unsigned int orig_sgl_count) 576 { 577 int i; 578 int j = 0; 579 unsigned long src, dest; 580 unsigned int srclen, destlen, copylen; 581 unsigned int total_copied = 0; 582 unsigned long bounce_addr = 0; 583 unsigned long src_addr = 0; 584 unsigned long flags; 585 586 local_irq_save(flags); 587 588 for (i = 0; i < orig_sgl_count; i++) { 589 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; 590 src = src_addr; 591 srclen = orig_sgl[i].length; 592 593 if (bounce_addr == 0) 594 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 595 596 while (srclen) { 597 /* assume bounce offset always == 0 */ 598 dest = bounce_addr + bounce_sgl[j].length; 599 destlen = PAGE_SIZE - bounce_sgl[j].length; 600 601 copylen = min(srclen, destlen); 602 memcpy((void *)dest, (void *)src, copylen); 603 604 total_copied += copylen; 605 bounce_sgl[j].length += copylen; 606 srclen -= copylen; 607 src += copylen; 608 609 if (bounce_sgl[j].length == PAGE_SIZE) { 610 /* full..move to next entry */ 611 sg_kunmap_atomic(bounce_addr); 612 j++; 613 614 /* if we need to use another bounce buffer */ 615 if (srclen || i != orig_sgl_count - 1) 616 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 617 618 } else if (srclen == 0 && i == orig_sgl_count - 1) { 619 /* unmap the last bounce that is < PAGE_SIZE */ 620 sg_kunmap_atomic(bounce_addr); 621 } 622 } 623 624 sg_kunmap_atomic(src_addr - orig_sgl[i].offset); 625 } 626 627 local_irq_restore(flags); 628 629 return total_copied; 630 } 631 632 static int storvsc_channel_init(struct hv_device *device) 633 { 634 struct storvsc_device *stor_device; 635 struct storvsc_cmd_request *request; 636 struct vstor_packet *vstor_packet; 637 int ret, t; 638 639 stor_device = get_out_stor_device(device); 640 if (!stor_device) 641 return -ENODEV; 642 643 request = &stor_device->init_request; 644 vstor_packet = &request->vstor_packet; 645 646 /* 647 * Now, initiate the vsc/vsp initialization protocol on the open 648 * channel 649 */ 650 memset(request, 0, sizeof(struct storvsc_cmd_request)); 651 init_completion(&request->wait_event); 652 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 653 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 654 655 ret = vmbus_sendpacket(device->channel, vstor_packet, 656 sizeof(struct vstor_packet), 657 (unsigned long)request, 658 VM_PKT_DATA_INBAND, 659 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 660 if (ret != 0) 661 goto cleanup; 662 663 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 664 if (t == 0) { 665 ret = -ETIMEDOUT; 666 goto cleanup; 667 } 668 669 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 670 vstor_packet->status != 0) 671 goto cleanup; 672 673 674 /* reuse the packet for version range supported */ 675 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 676 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 677 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 678 679 vstor_packet->version.major_minor = 680 storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR); 681 682 /* 683 * The revision number is only used in Windows; set it to 0. 684 */ 685 vstor_packet->version.revision = 0; 686 687 ret = vmbus_sendpacket(device->channel, vstor_packet, 688 sizeof(struct vstor_packet), 689 (unsigned long)request, 690 VM_PKT_DATA_INBAND, 691 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 692 if (ret != 0) 693 goto cleanup; 694 695 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 696 if (t == 0) { 697 ret = -ETIMEDOUT; 698 goto cleanup; 699 } 700 701 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 702 vstor_packet->status != 0) 703 goto cleanup; 704 705 706 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 707 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 708 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 709 vstor_packet->storage_channel_properties.port_number = 710 stor_device->port_number; 711 712 ret = vmbus_sendpacket(device->channel, vstor_packet, 713 sizeof(struct vstor_packet), 714 (unsigned long)request, 715 VM_PKT_DATA_INBAND, 716 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 717 718 if (ret != 0) 719 goto cleanup; 720 721 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 722 if (t == 0) { 723 ret = -ETIMEDOUT; 724 goto cleanup; 725 } 726 727 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 728 vstor_packet->status != 0) 729 goto cleanup; 730 731 stor_device->path_id = vstor_packet->storage_channel_properties.path_id; 732 stor_device->target_id 733 = vstor_packet->storage_channel_properties.target_id; 734 735 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 736 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 737 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 738 739 ret = vmbus_sendpacket(device->channel, vstor_packet, 740 sizeof(struct vstor_packet), 741 (unsigned long)request, 742 VM_PKT_DATA_INBAND, 743 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 744 745 if (ret != 0) 746 goto cleanup; 747 748 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 749 if (t == 0) { 750 ret = -ETIMEDOUT; 751 goto cleanup; 752 } 753 754 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 755 vstor_packet->status != 0) 756 goto cleanup; 757 758 759 cleanup: 760 return ret; 761 } 762 763 764 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) 765 { 766 struct scsi_cmnd *scmnd = cmd_request->cmd; 767 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 768 void (*scsi_done_fn)(struct scsi_cmnd *); 769 struct scsi_sense_hdr sense_hdr; 770 struct vmscsi_request *vm_srb; 771 struct storvsc_scan_work *wrk; 772 struct stor_mem_pools *memp = scmnd->device->hostdata; 773 774 vm_srb = &cmd_request->vstor_packet.vm_srb; 775 if (cmd_request->bounce_sgl_count) { 776 if (vm_srb->data_in == READ_TYPE) 777 copy_from_bounce_buffer(scsi_sglist(scmnd), 778 cmd_request->bounce_sgl, 779 scsi_sg_count(scmnd), 780 cmd_request->bounce_sgl_count); 781 destroy_bounce_buffer(cmd_request->bounce_sgl, 782 cmd_request->bounce_sgl_count); 783 } 784 785 /* 786 * If there is an error; offline the device since all 787 * error recovery strategies would have already been 788 * deployed on the host side. However, if the command 789 * were a pass-through command deal with it appropriately. 790 */ 791 scmnd->result = vm_srb->scsi_status; 792 793 if (vm_srb->srb_status == SRB_STATUS_ERROR) { 794 switch (scmnd->cmnd[0]) { 795 case ATA_16: 796 case ATA_12: 797 set_host_byte(scmnd, DID_PASSTHROUGH); 798 break; 799 default: 800 set_host_byte(scmnd, DID_TARGET_FAILURE); 801 } 802 } 803 804 805 /* 806 * If the LUN is invalid; remove the device. 807 */ 808 if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) { 809 struct storvsc_device *stor_dev; 810 struct hv_device *dev = host_dev->dev; 811 struct Scsi_Host *host; 812 813 stor_dev = get_in_stor_device(dev); 814 host = stor_dev->host; 815 816 wrk = kmalloc(sizeof(struct storvsc_scan_work), 817 GFP_ATOMIC); 818 if (!wrk) { 819 scmnd->result = DID_TARGET_FAILURE << 16; 820 } else { 821 wrk->host = host; 822 wrk->lun = vm_srb->lun; 823 INIT_WORK(&wrk->work, storvsc_remove_lun); 824 schedule_work(&wrk->work); 825 } 826 } 827 828 if (scmnd->result) { 829 if (scsi_normalize_sense(scmnd->sense_buffer, 830 SCSI_SENSE_BUFFERSIZE, &sense_hdr)) 831 scsi_print_sense_hdr("storvsc", &sense_hdr); 832 } 833 834 scsi_set_resid(scmnd, 835 cmd_request->data_buffer.len - 836 vm_srb->data_transfer_length); 837 838 scsi_done_fn = scmnd->scsi_done; 839 840 scmnd->host_scribble = NULL; 841 scmnd->scsi_done = NULL; 842 843 scsi_done_fn(scmnd); 844 845 mempool_free(cmd_request, memp->request_mempool); 846 } 847 848 static void storvsc_on_io_completion(struct hv_device *device, 849 struct vstor_packet *vstor_packet, 850 struct storvsc_cmd_request *request) 851 { 852 struct storvsc_device *stor_device; 853 struct vstor_packet *stor_pkt; 854 855 stor_device = hv_get_drvdata(device); 856 stor_pkt = &request->vstor_packet; 857 858 /* 859 * The current SCSI handling on the host side does 860 * not correctly handle: 861 * INQUIRY command with page code parameter set to 0x80 862 * MODE_SENSE command with cmd[2] == 0x1c 863 * 864 * Setup srb and scsi status so this won't be fatal. 865 * We do this so we can distinguish truly fatal failues 866 * (srb status == 0x4) and off-line the device in that case. 867 */ 868 869 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 870 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 871 vstor_packet->vm_srb.scsi_status = 0; 872 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 873 } 874 875 876 /* Copy over the status...etc */ 877 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 878 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 879 stor_pkt->vm_srb.sense_info_length = 880 vstor_packet->vm_srb.sense_info_length; 881 882 if (vstor_packet->vm_srb.scsi_status != 0 || 883 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ 884 dev_warn(&device->device, 885 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 886 stor_pkt->vm_srb.cdb[0], 887 vstor_packet->vm_srb.scsi_status, 888 vstor_packet->vm_srb.srb_status); 889 } 890 891 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 892 /* CHECK_CONDITION */ 893 if (vstor_packet->vm_srb.srb_status & 894 SRB_STATUS_AUTOSENSE_VALID) { 895 /* autosense data available */ 896 dev_warn(&device->device, 897 "stor pkt %p autosense data valid - len %d\n", 898 request, 899 vstor_packet->vm_srb.sense_info_length); 900 901 memcpy(request->sense_buffer, 902 vstor_packet->vm_srb.sense_data, 903 vstor_packet->vm_srb.sense_info_length); 904 905 } 906 } 907 908 stor_pkt->vm_srb.data_transfer_length = 909 vstor_packet->vm_srb.data_transfer_length; 910 911 storvsc_command_completion(request); 912 913 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 914 stor_device->drain_notify) 915 wake_up(&stor_device->waiting_to_drain); 916 917 918 } 919 920 static void storvsc_on_receive(struct hv_device *device, 921 struct vstor_packet *vstor_packet, 922 struct storvsc_cmd_request *request) 923 { 924 struct storvsc_scan_work *work; 925 struct storvsc_device *stor_device; 926 927 switch (vstor_packet->operation) { 928 case VSTOR_OPERATION_COMPLETE_IO: 929 storvsc_on_io_completion(device, vstor_packet, request); 930 break; 931 932 case VSTOR_OPERATION_REMOVE_DEVICE: 933 case VSTOR_OPERATION_ENUMERATE_BUS: 934 stor_device = get_in_stor_device(device); 935 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 936 if (!work) 937 return; 938 939 INIT_WORK(&work->work, storvsc_bus_scan); 940 work->host = stor_device->host; 941 schedule_work(&work->work); 942 break; 943 944 default: 945 break; 946 } 947 } 948 949 static void storvsc_on_channel_callback(void *context) 950 { 951 struct hv_device *device = (struct hv_device *)context; 952 struct storvsc_device *stor_device; 953 u32 bytes_recvd; 954 u64 request_id; 955 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; 956 struct storvsc_cmd_request *request; 957 int ret; 958 959 960 stor_device = get_in_stor_device(device); 961 if (!stor_device) 962 return; 963 964 do { 965 ret = vmbus_recvpacket(device->channel, packet, 966 ALIGN(sizeof(struct vstor_packet), 8), 967 &bytes_recvd, &request_id); 968 if (ret == 0 && bytes_recvd > 0) { 969 970 request = (struct storvsc_cmd_request *) 971 (unsigned long)request_id; 972 973 if ((request == &stor_device->init_request) || 974 (request == &stor_device->reset_request)) { 975 976 memcpy(&request->vstor_packet, packet, 977 sizeof(struct vstor_packet)); 978 complete(&request->wait_event); 979 } else { 980 storvsc_on_receive(device, 981 (struct vstor_packet *)packet, 982 request); 983 } 984 } else { 985 break; 986 } 987 } while (1); 988 989 return; 990 } 991 992 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) 993 { 994 struct vmstorage_channel_properties props; 995 int ret; 996 997 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 998 999 ret = vmbus_open(device->channel, 1000 ring_size, 1001 ring_size, 1002 (void *)&props, 1003 sizeof(struct vmstorage_channel_properties), 1004 storvsc_on_channel_callback, device); 1005 1006 if (ret != 0) 1007 return ret; 1008 1009 ret = storvsc_channel_init(device); 1010 1011 return ret; 1012 } 1013 1014 static int storvsc_dev_remove(struct hv_device *device) 1015 { 1016 struct storvsc_device *stor_device; 1017 unsigned long flags; 1018 1019 stor_device = hv_get_drvdata(device); 1020 1021 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1022 stor_device->destroy = true; 1023 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1024 1025 /* 1026 * At this point, all outbound traffic should be disable. We 1027 * only allow inbound traffic (responses) to proceed so that 1028 * outstanding requests can be completed. 1029 */ 1030 1031 storvsc_wait_to_drain(stor_device); 1032 1033 /* 1034 * Since we have already drained, we don't need to busy wait 1035 * as was done in final_release_stor_device() 1036 * Note that we cannot set the ext pointer to NULL until 1037 * we have drained - to drain the outgoing packets, we need to 1038 * allow incoming packets. 1039 */ 1040 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1041 hv_set_drvdata(device, NULL); 1042 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1043 1044 /* Close the channel */ 1045 vmbus_close(device->channel); 1046 1047 kfree(stor_device); 1048 return 0; 1049 } 1050 1051 static int storvsc_do_io(struct hv_device *device, 1052 struct storvsc_cmd_request *request) 1053 { 1054 struct storvsc_device *stor_device; 1055 struct vstor_packet *vstor_packet; 1056 int ret = 0; 1057 1058 vstor_packet = &request->vstor_packet; 1059 stor_device = get_out_stor_device(device); 1060 1061 if (!stor_device) 1062 return -ENODEV; 1063 1064 1065 request->device = device; 1066 1067 1068 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1069 1070 vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); 1071 1072 1073 vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE; 1074 1075 1076 vstor_packet->vm_srb.data_transfer_length = 1077 request->data_buffer.len; 1078 1079 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1080 1081 if (request->data_buffer.len) { 1082 ret = vmbus_sendpacket_multipagebuffer(device->channel, 1083 &request->data_buffer, 1084 vstor_packet, 1085 sizeof(struct vstor_packet), 1086 (unsigned long)request); 1087 } else { 1088 ret = vmbus_sendpacket(device->channel, vstor_packet, 1089 sizeof(struct vstor_packet), 1090 (unsigned long)request, 1091 VM_PKT_DATA_INBAND, 1092 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1093 } 1094 1095 if (ret != 0) 1096 return ret; 1097 1098 atomic_inc(&stor_device->num_outstanding_req); 1099 1100 return ret; 1101 } 1102 1103 static int storvsc_device_alloc(struct scsi_device *sdevice) 1104 { 1105 struct stor_mem_pools *memp; 1106 int number = STORVSC_MIN_BUF_NR; 1107 1108 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); 1109 if (!memp) 1110 return -ENOMEM; 1111 1112 memp->request_pool = 1113 kmem_cache_create(dev_name(&sdevice->sdev_dev), 1114 sizeof(struct storvsc_cmd_request), 0, 1115 SLAB_HWCACHE_ALIGN, NULL); 1116 1117 if (!memp->request_pool) 1118 goto err0; 1119 1120 memp->request_mempool = mempool_create(number, mempool_alloc_slab, 1121 mempool_free_slab, 1122 memp->request_pool); 1123 1124 if (!memp->request_mempool) 1125 goto err1; 1126 1127 sdevice->hostdata = memp; 1128 1129 return 0; 1130 1131 err1: 1132 kmem_cache_destroy(memp->request_pool); 1133 1134 err0: 1135 kfree(memp); 1136 return -ENOMEM; 1137 } 1138 1139 static void storvsc_device_destroy(struct scsi_device *sdevice) 1140 { 1141 struct stor_mem_pools *memp = sdevice->hostdata; 1142 1143 mempool_destroy(memp->request_mempool); 1144 kmem_cache_destroy(memp->request_pool); 1145 kfree(memp); 1146 sdevice->hostdata = NULL; 1147 } 1148 1149 static int storvsc_device_configure(struct scsi_device *sdevice) 1150 { 1151 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, 1152 STORVSC_MAX_IO_REQUESTS); 1153 1154 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); 1155 1156 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); 1157 1158 return 0; 1159 } 1160 1161 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1162 sector_t capacity, int *info) 1163 { 1164 sector_t nsect = capacity; 1165 sector_t cylinders = nsect; 1166 int heads, sectors_pt; 1167 1168 /* 1169 * We are making up these values; let us keep it simple. 1170 */ 1171 heads = 0xff; 1172 sectors_pt = 0x3f; /* Sectors per track */ 1173 sector_div(cylinders, heads * sectors_pt); 1174 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1175 cylinders = 0xffff; 1176 1177 info[0] = heads; 1178 info[1] = sectors_pt; 1179 info[2] = (int)cylinders; 1180 1181 return 0; 1182 } 1183 1184 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1185 { 1186 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1187 struct hv_device *device = host_dev->dev; 1188 1189 struct storvsc_device *stor_device; 1190 struct storvsc_cmd_request *request; 1191 struct vstor_packet *vstor_packet; 1192 int ret, t; 1193 1194 1195 stor_device = get_out_stor_device(device); 1196 if (!stor_device) 1197 return FAILED; 1198 1199 request = &stor_device->reset_request; 1200 vstor_packet = &request->vstor_packet; 1201 1202 init_completion(&request->wait_event); 1203 1204 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1205 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1206 vstor_packet->vm_srb.path_id = stor_device->path_id; 1207 1208 ret = vmbus_sendpacket(device->channel, vstor_packet, 1209 sizeof(struct vstor_packet), 1210 (unsigned long)&stor_device->reset_request, 1211 VM_PKT_DATA_INBAND, 1212 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1213 if (ret != 0) 1214 return FAILED; 1215 1216 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1217 if (t == 0) 1218 return TIMEOUT_ERROR; 1219 1220 1221 /* 1222 * At this point, all outstanding requests in the adapter 1223 * should have been flushed out and return to us 1224 * There is a potential race here where the host may be in 1225 * the process of responding when we return from here. 1226 * Just wait for all in-transit packets to be accounted for 1227 * before we return from here. 1228 */ 1229 storvsc_wait_to_drain(stor_device); 1230 1231 return SUCCESS; 1232 } 1233 1234 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1235 { 1236 bool allowed = true; 1237 u8 scsi_op = scmnd->cmnd[0]; 1238 1239 switch (scsi_op) { 1240 /* 1241 * smartd sends this command and the host does not handle 1242 * this. So, don't send it. 1243 */ 1244 case SET_WINDOW: 1245 scmnd->result = ILLEGAL_REQUEST << 16; 1246 allowed = false; 1247 break; 1248 default: 1249 break; 1250 } 1251 return allowed; 1252 } 1253 1254 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1255 { 1256 int ret; 1257 struct hv_host_device *host_dev = shost_priv(host); 1258 struct hv_device *dev = host_dev->dev; 1259 struct storvsc_cmd_request *cmd_request; 1260 unsigned int request_size = 0; 1261 int i; 1262 struct scatterlist *sgl; 1263 unsigned int sg_count = 0; 1264 struct vmscsi_request *vm_srb; 1265 struct stor_mem_pools *memp = scmnd->device->hostdata; 1266 1267 if (!storvsc_scsi_cmd_ok(scmnd)) { 1268 scmnd->scsi_done(scmnd); 1269 return 0; 1270 } 1271 1272 request_size = sizeof(struct storvsc_cmd_request); 1273 1274 cmd_request = mempool_alloc(memp->request_mempool, 1275 GFP_ATOMIC); 1276 1277 /* 1278 * We might be invoked in an interrupt context; hence 1279 * mempool_alloc() can fail. 1280 */ 1281 if (!cmd_request) 1282 return SCSI_MLQUEUE_DEVICE_BUSY; 1283 1284 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); 1285 1286 /* Setup the cmd request */ 1287 cmd_request->cmd = scmnd; 1288 1289 scmnd->host_scribble = (unsigned char *)cmd_request; 1290 1291 vm_srb = &cmd_request->vstor_packet.vm_srb; 1292 1293 1294 /* Build the SRB */ 1295 switch (scmnd->sc_data_direction) { 1296 case DMA_TO_DEVICE: 1297 vm_srb->data_in = WRITE_TYPE; 1298 break; 1299 case DMA_FROM_DEVICE: 1300 vm_srb->data_in = READ_TYPE; 1301 break; 1302 default: 1303 vm_srb->data_in = UNKNOWN_TYPE; 1304 break; 1305 } 1306 1307 1308 vm_srb->port_number = host_dev->port; 1309 vm_srb->path_id = scmnd->device->channel; 1310 vm_srb->target_id = scmnd->device->id; 1311 vm_srb->lun = scmnd->device->lun; 1312 1313 vm_srb->cdb_length = scmnd->cmd_len; 1314 1315 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1316 1317 cmd_request->sense_buffer = scmnd->sense_buffer; 1318 1319 1320 cmd_request->data_buffer.len = scsi_bufflen(scmnd); 1321 if (scsi_sg_count(scmnd)) { 1322 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1323 sg_count = scsi_sg_count(scmnd); 1324 1325 /* check if we need to bounce the sgl */ 1326 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { 1327 cmd_request->bounce_sgl = 1328 create_bounce_buffer(sgl, scsi_sg_count(scmnd), 1329 scsi_bufflen(scmnd), 1330 vm_srb->data_in); 1331 if (!cmd_request->bounce_sgl) { 1332 ret = SCSI_MLQUEUE_HOST_BUSY; 1333 goto queue_error; 1334 } 1335 1336 cmd_request->bounce_sgl_count = 1337 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> 1338 PAGE_SHIFT; 1339 1340 if (vm_srb->data_in == WRITE_TYPE) 1341 copy_to_bounce_buffer(sgl, 1342 cmd_request->bounce_sgl, 1343 scsi_sg_count(scmnd)); 1344 1345 sgl = cmd_request->bounce_sgl; 1346 sg_count = cmd_request->bounce_sgl_count; 1347 } 1348 1349 cmd_request->data_buffer.offset = sgl[0].offset; 1350 1351 for (i = 0; i < sg_count; i++) 1352 cmd_request->data_buffer.pfn_array[i] = 1353 page_to_pfn(sg_page((&sgl[i]))); 1354 1355 } else if (scsi_sglist(scmnd)) { 1356 cmd_request->data_buffer.offset = 1357 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); 1358 cmd_request->data_buffer.pfn_array[0] = 1359 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; 1360 } 1361 1362 /* Invokes the vsc to start an IO */ 1363 ret = storvsc_do_io(dev, cmd_request); 1364 1365 if (ret == -EAGAIN) { 1366 /* no more space */ 1367 1368 if (cmd_request->bounce_sgl_count) { 1369 destroy_bounce_buffer(cmd_request->bounce_sgl, 1370 cmd_request->bounce_sgl_count); 1371 1372 ret = SCSI_MLQUEUE_DEVICE_BUSY; 1373 goto queue_error; 1374 } 1375 } 1376 1377 return 0; 1378 1379 queue_error: 1380 mempool_free(cmd_request, memp->request_mempool); 1381 scmnd->host_scribble = NULL; 1382 return ret; 1383 } 1384 1385 static struct scsi_host_template scsi_driver = { 1386 .module = THIS_MODULE, 1387 .name = "storvsc_host_t", 1388 .bios_param = storvsc_get_chs, 1389 .queuecommand = storvsc_queuecommand, 1390 .eh_host_reset_handler = storvsc_host_reset_handler, 1391 .slave_alloc = storvsc_device_alloc, 1392 .slave_destroy = storvsc_device_destroy, 1393 .slave_configure = storvsc_device_configure, 1394 .cmd_per_lun = 1, 1395 /* 64 max_queue * 1 target */ 1396 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, 1397 .this_id = -1, 1398 /* no use setting to 0 since ll_blk_rw reset it to 1 */ 1399 /* currently 32 */ 1400 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, 1401 .use_clustering = DISABLE_CLUSTERING, 1402 /* Make sure we dont get a sg segment crosses a page boundary */ 1403 .dma_boundary = PAGE_SIZE-1, 1404 }; 1405 1406 enum { 1407 SCSI_GUID, 1408 IDE_GUID, 1409 }; 1410 1411 static const struct hv_vmbus_device_id id_table[] = { 1412 /* SCSI guid */ 1413 { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, 1414 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) 1415 .driver_data = SCSI_GUID }, 1416 /* IDE guid */ 1417 { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, 1418 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) 1419 .driver_data = IDE_GUID }, 1420 { }, 1421 }; 1422 1423 MODULE_DEVICE_TABLE(vmbus, id_table); 1424 1425 static int storvsc_probe(struct hv_device *device, 1426 const struct hv_vmbus_device_id *dev_id) 1427 { 1428 int ret; 1429 struct Scsi_Host *host; 1430 struct hv_host_device *host_dev; 1431 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1432 int target = 0; 1433 struct storvsc_device *stor_device; 1434 1435 host = scsi_host_alloc(&scsi_driver, 1436 sizeof(struct hv_host_device)); 1437 if (!host) 1438 return -ENOMEM; 1439 1440 host_dev = shost_priv(host); 1441 memset(host_dev, 0, sizeof(struct hv_host_device)); 1442 1443 host_dev->port = host->host_no; 1444 host_dev->dev = device; 1445 1446 1447 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1448 if (!stor_device) { 1449 ret = -ENOMEM; 1450 goto err_out0; 1451 } 1452 1453 stor_device->destroy = false; 1454 init_waitqueue_head(&stor_device->waiting_to_drain); 1455 stor_device->device = device; 1456 stor_device->host = host; 1457 hv_set_drvdata(device, stor_device); 1458 1459 stor_device->port_number = host->host_no; 1460 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); 1461 if (ret) 1462 goto err_out1; 1463 1464 host_dev->path = stor_device->path_id; 1465 host_dev->target = stor_device->target_id; 1466 1467 /* max # of devices per target */ 1468 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; 1469 /* max # of targets per channel */ 1470 host->max_id = STORVSC_MAX_TARGETS; 1471 /* max # of channels */ 1472 host->max_channel = STORVSC_MAX_CHANNELS - 1; 1473 /* max cmd length */ 1474 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1475 1476 /* Register the HBA and start the scsi bus scan */ 1477 ret = scsi_add_host(host, &device->device); 1478 if (ret != 0) 1479 goto err_out2; 1480 1481 if (!dev_is_ide) { 1482 scsi_scan_host(host); 1483 } else { 1484 target = (device->dev_instance.b[5] << 8 | 1485 device->dev_instance.b[4]); 1486 ret = scsi_add_device(host, 0, target, 0); 1487 if (ret) { 1488 scsi_remove_host(host); 1489 goto err_out2; 1490 } 1491 } 1492 return 0; 1493 1494 err_out2: 1495 /* 1496 * Once we have connected with the host, we would need to 1497 * to invoke storvsc_dev_remove() to rollback this state and 1498 * this call also frees up the stor_device; hence the jump around 1499 * err_out1 label. 1500 */ 1501 storvsc_dev_remove(device); 1502 goto err_out0; 1503 1504 err_out1: 1505 kfree(stor_device); 1506 1507 err_out0: 1508 scsi_host_put(host); 1509 return ret; 1510 } 1511 1512 static int storvsc_remove(struct hv_device *dev) 1513 { 1514 struct storvsc_device *stor_device = hv_get_drvdata(dev); 1515 struct Scsi_Host *host = stor_device->host; 1516 1517 scsi_remove_host(host); 1518 storvsc_dev_remove(dev); 1519 scsi_host_put(host); 1520 1521 return 0; 1522 } 1523 1524 static struct hv_driver storvsc_drv = { 1525 .name = KBUILD_MODNAME, 1526 .id_table = id_table, 1527 .probe = storvsc_probe, 1528 .remove = storvsc_remove, 1529 }; 1530 1531 static int __init storvsc_drv_init(void) 1532 { 1533 u32 max_outstanding_req_per_channel; 1534 1535 /* 1536 * Divide the ring buffer data size (which is 1 page less 1537 * than the ring buffer size since that page is reserved for 1538 * the ring buffer indices) by the max request size (which is 1539 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 1540 */ 1541 max_outstanding_req_per_channel = 1542 ((storvsc_ringbuffer_size - PAGE_SIZE) / 1543 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 1544 sizeof(struct vstor_packet) + sizeof(u64), 1545 sizeof(u64))); 1546 1547 if (max_outstanding_req_per_channel < 1548 STORVSC_MAX_IO_REQUESTS) 1549 return -EINVAL; 1550 1551 return vmbus_driver_register(&storvsc_drv); 1552 } 1553 1554 static void __exit storvsc_drv_exit(void) 1555 { 1556 vmbus_driver_unregister(&storvsc_drv); 1557 } 1558 1559 MODULE_LICENSE("GPL"); 1560 MODULE_VERSION(HV_DRV_VERSION); 1561 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 1562 module_init(storvsc_drv_init); 1563 module_exit(storvsc_drv_exit); 1564