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 /* Assume the original sgl has enough room */ 485 static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, 486 struct scatterlist *bounce_sgl, 487 unsigned int orig_sgl_count, 488 unsigned int bounce_sgl_count) 489 { 490 int i; 491 int j = 0; 492 unsigned long src, dest; 493 unsigned int srclen, destlen, copylen; 494 unsigned int total_copied = 0; 495 unsigned long bounce_addr = 0; 496 unsigned long dest_addr = 0; 497 unsigned long flags; 498 499 local_irq_save(flags); 500 501 for (i = 0; i < orig_sgl_count; i++) { 502 dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), 503 KM_IRQ0) + orig_sgl[i].offset; 504 dest = dest_addr; 505 destlen = orig_sgl[i].length; 506 507 if (bounce_addr == 0) 508 bounce_addr = 509 (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), 510 KM_IRQ0); 511 512 while (destlen) { 513 src = bounce_addr + bounce_sgl[j].offset; 514 srclen = bounce_sgl[j].length - bounce_sgl[j].offset; 515 516 copylen = min(srclen, destlen); 517 memcpy((void *)dest, (void *)src, copylen); 518 519 total_copied += copylen; 520 bounce_sgl[j].offset += copylen; 521 destlen -= copylen; 522 dest += copylen; 523 524 if (bounce_sgl[j].offset == bounce_sgl[j].length) { 525 /* full */ 526 kunmap_atomic((void *)bounce_addr, KM_IRQ0); 527 j++; 528 529 /* 530 * It is possible that the number of elements 531 * in the bounce buffer may not be equal to 532 * the number of elements in the original 533 * scatter list. Handle this correctly. 534 */ 535 536 if (j == bounce_sgl_count) { 537 /* 538 * We are done; cleanup and return. 539 */ 540 kunmap_atomic((void *)(dest_addr - 541 orig_sgl[i].offset), 542 KM_IRQ0); 543 local_irq_restore(flags); 544 return total_copied; 545 } 546 547 /* if we need to use another bounce buffer */ 548 if (destlen || i != orig_sgl_count - 1) 549 bounce_addr = 550 (unsigned long)kmap_atomic( 551 sg_page((&bounce_sgl[j])), KM_IRQ0); 552 } else if (destlen == 0 && i == orig_sgl_count - 1) { 553 /* unmap the last bounce that is < PAGE_SIZE */ 554 kunmap_atomic((void *)bounce_addr, KM_IRQ0); 555 } 556 } 557 558 kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset), 559 KM_IRQ0); 560 } 561 562 local_irq_restore(flags); 563 564 return total_copied; 565 } 566 567 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ 568 static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, 569 struct scatterlist *bounce_sgl, 570 unsigned int orig_sgl_count) 571 { 572 int i; 573 int j = 0; 574 unsigned long src, dest; 575 unsigned int srclen, destlen, copylen; 576 unsigned int total_copied = 0; 577 unsigned long bounce_addr = 0; 578 unsigned long src_addr = 0; 579 unsigned long flags; 580 581 local_irq_save(flags); 582 583 for (i = 0; i < orig_sgl_count; i++) { 584 src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), 585 KM_IRQ0) + orig_sgl[i].offset; 586 src = src_addr; 587 srclen = orig_sgl[i].length; 588 589 if (bounce_addr == 0) 590 bounce_addr = 591 (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), 592 KM_IRQ0); 593 594 while (srclen) { 595 /* assume bounce offset always == 0 */ 596 dest = bounce_addr + bounce_sgl[j].length; 597 destlen = PAGE_SIZE - bounce_sgl[j].length; 598 599 copylen = min(srclen, destlen); 600 memcpy((void *)dest, (void *)src, copylen); 601 602 total_copied += copylen; 603 bounce_sgl[j].length += copylen; 604 srclen -= copylen; 605 src += copylen; 606 607 if (bounce_sgl[j].length == PAGE_SIZE) { 608 /* full..move to next entry */ 609 kunmap_atomic((void *)bounce_addr, KM_IRQ0); 610 j++; 611 612 /* if we need to use another bounce buffer */ 613 if (srclen || i != orig_sgl_count - 1) 614 bounce_addr = 615 (unsigned long)kmap_atomic( 616 sg_page((&bounce_sgl[j])), KM_IRQ0); 617 618 } else if (srclen == 0 && i == orig_sgl_count - 1) { 619 /* unmap the last bounce that is < PAGE_SIZE */ 620 kunmap_atomic((void *)bounce_addr, KM_IRQ0); 621 } 622 } 623 624 kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0); 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. 789 */ 790 if (vm_srb->srb_status == SRB_STATUS_ERROR) 791 scmnd->result = DID_TARGET_FAILURE << 16; 792 else 793 scmnd->result = vm_srb->scsi_status; 794 795 /* 796 * If the LUN is invalid; remove the device. 797 */ 798 if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) { 799 struct storvsc_device *stor_dev; 800 struct hv_device *dev = host_dev->dev; 801 struct Scsi_Host *host; 802 803 stor_dev = get_in_stor_device(dev); 804 host = stor_dev->host; 805 806 wrk = kmalloc(sizeof(struct storvsc_scan_work), 807 GFP_ATOMIC); 808 if (!wrk) { 809 scmnd->result = DID_TARGET_FAILURE << 16; 810 } else { 811 wrk->host = host; 812 wrk->lun = vm_srb->lun; 813 INIT_WORK(&wrk->work, storvsc_remove_lun); 814 schedule_work(&wrk->work); 815 } 816 } 817 818 if (scmnd->result) { 819 if (scsi_normalize_sense(scmnd->sense_buffer, 820 SCSI_SENSE_BUFFERSIZE, &sense_hdr)) 821 scsi_print_sense_hdr("storvsc", &sense_hdr); 822 } 823 824 scsi_set_resid(scmnd, 825 cmd_request->data_buffer.len - 826 vm_srb->data_transfer_length); 827 828 scsi_done_fn = scmnd->scsi_done; 829 830 scmnd->host_scribble = NULL; 831 scmnd->scsi_done = NULL; 832 833 scsi_done_fn(scmnd); 834 835 mempool_free(cmd_request, memp->request_mempool); 836 } 837 838 static void storvsc_on_io_completion(struct hv_device *device, 839 struct vstor_packet *vstor_packet, 840 struct storvsc_cmd_request *request) 841 { 842 struct storvsc_device *stor_device; 843 struct vstor_packet *stor_pkt; 844 845 stor_device = hv_get_drvdata(device); 846 stor_pkt = &request->vstor_packet; 847 848 /* 849 * The current SCSI handling on the host side does 850 * not correctly handle: 851 * INQUIRY command with page code parameter set to 0x80 852 * MODE_SENSE command with cmd[2] == 0x1c 853 * 854 * Setup srb and scsi status so this won't be fatal. 855 * We do this so we can distinguish truly fatal failues 856 * (srb status == 0x4) and off-line the device in that case. 857 */ 858 859 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 860 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 861 vstor_packet->vm_srb.scsi_status = 0; 862 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 863 } 864 865 866 /* Copy over the status...etc */ 867 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 868 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 869 stor_pkt->vm_srb.sense_info_length = 870 vstor_packet->vm_srb.sense_info_length; 871 872 if (vstor_packet->vm_srb.scsi_status != 0 || 873 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ 874 dev_warn(&device->device, 875 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 876 stor_pkt->vm_srb.cdb[0], 877 vstor_packet->vm_srb.scsi_status, 878 vstor_packet->vm_srb.srb_status); 879 } 880 881 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 882 /* CHECK_CONDITION */ 883 if (vstor_packet->vm_srb.srb_status & 884 SRB_STATUS_AUTOSENSE_VALID) { 885 /* autosense data available */ 886 dev_warn(&device->device, 887 "stor pkt %p autosense data valid - len %d\n", 888 request, 889 vstor_packet->vm_srb.sense_info_length); 890 891 memcpy(request->sense_buffer, 892 vstor_packet->vm_srb.sense_data, 893 vstor_packet->vm_srb.sense_info_length); 894 895 } 896 } 897 898 stor_pkt->vm_srb.data_transfer_length = 899 vstor_packet->vm_srb.data_transfer_length; 900 901 storvsc_command_completion(request); 902 903 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 904 stor_device->drain_notify) 905 wake_up(&stor_device->waiting_to_drain); 906 907 908 } 909 910 static void storvsc_on_receive(struct hv_device *device, 911 struct vstor_packet *vstor_packet, 912 struct storvsc_cmd_request *request) 913 { 914 struct storvsc_scan_work *work; 915 struct storvsc_device *stor_device; 916 917 switch (vstor_packet->operation) { 918 case VSTOR_OPERATION_COMPLETE_IO: 919 storvsc_on_io_completion(device, vstor_packet, request); 920 break; 921 922 case VSTOR_OPERATION_REMOVE_DEVICE: 923 case VSTOR_OPERATION_ENUMERATE_BUS: 924 stor_device = get_in_stor_device(device); 925 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 926 if (!work) 927 return; 928 929 INIT_WORK(&work->work, storvsc_bus_scan); 930 work->host = stor_device->host; 931 schedule_work(&work->work); 932 break; 933 934 default: 935 break; 936 } 937 } 938 939 static void storvsc_on_channel_callback(void *context) 940 { 941 struct hv_device *device = (struct hv_device *)context; 942 struct storvsc_device *stor_device; 943 u32 bytes_recvd; 944 u64 request_id; 945 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; 946 struct storvsc_cmd_request *request; 947 int ret; 948 949 950 stor_device = get_in_stor_device(device); 951 if (!stor_device) 952 return; 953 954 do { 955 ret = vmbus_recvpacket(device->channel, packet, 956 ALIGN(sizeof(struct vstor_packet), 8), 957 &bytes_recvd, &request_id); 958 if (ret == 0 && bytes_recvd > 0) { 959 960 request = (struct storvsc_cmd_request *) 961 (unsigned long)request_id; 962 963 if ((request == &stor_device->init_request) || 964 (request == &stor_device->reset_request)) { 965 966 memcpy(&request->vstor_packet, packet, 967 sizeof(struct vstor_packet)); 968 complete(&request->wait_event); 969 } else { 970 storvsc_on_receive(device, 971 (struct vstor_packet *)packet, 972 request); 973 } 974 } else { 975 break; 976 } 977 } while (1); 978 979 return; 980 } 981 982 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) 983 { 984 struct vmstorage_channel_properties props; 985 int ret; 986 987 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 988 989 ret = vmbus_open(device->channel, 990 ring_size, 991 ring_size, 992 (void *)&props, 993 sizeof(struct vmstorage_channel_properties), 994 storvsc_on_channel_callback, device); 995 996 if (ret != 0) 997 return ret; 998 999 ret = storvsc_channel_init(device); 1000 1001 return ret; 1002 } 1003 1004 static int storvsc_dev_remove(struct hv_device *device) 1005 { 1006 struct storvsc_device *stor_device; 1007 unsigned long flags; 1008 1009 stor_device = hv_get_drvdata(device); 1010 1011 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1012 stor_device->destroy = true; 1013 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1014 1015 /* 1016 * At this point, all outbound traffic should be disable. We 1017 * only allow inbound traffic (responses) to proceed so that 1018 * outstanding requests can be completed. 1019 */ 1020 1021 storvsc_wait_to_drain(stor_device); 1022 1023 /* 1024 * Since we have already drained, we don't need to busy wait 1025 * as was done in final_release_stor_device() 1026 * Note that we cannot set the ext pointer to NULL until 1027 * we have drained - to drain the outgoing packets, we need to 1028 * allow incoming packets. 1029 */ 1030 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1031 hv_set_drvdata(device, NULL); 1032 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1033 1034 /* Close the channel */ 1035 vmbus_close(device->channel); 1036 1037 kfree(stor_device); 1038 return 0; 1039 } 1040 1041 static int storvsc_do_io(struct hv_device *device, 1042 struct storvsc_cmd_request *request) 1043 { 1044 struct storvsc_device *stor_device; 1045 struct vstor_packet *vstor_packet; 1046 int ret = 0; 1047 1048 vstor_packet = &request->vstor_packet; 1049 stor_device = get_out_stor_device(device); 1050 1051 if (!stor_device) 1052 return -ENODEV; 1053 1054 1055 request->device = device; 1056 1057 1058 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1059 1060 vstor_packet->vm_srb.length = sizeof(struct vmscsi_request); 1061 1062 1063 vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE; 1064 1065 1066 vstor_packet->vm_srb.data_transfer_length = 1067 request->data_buffer.len; 1068 1069 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1070 1071 if (request->data_buffer.len) { 1072 ret = vmbus_sendpacket_multipagebuffer(device->channel, 1073 &request->data_buffer, 1074 vstor_packet, 1075 sizeof(struct vstor_packet), 1076 (unsigned long)request); 1077 } else { 1078 ret = vmbus_sendpacket(device->channel, vstor_packet, 1079 sizeof(struct vstor_packet), 1080 (unsigned long)request, 1081 VM_PKT_DATA_INBAND, 1082 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1083 } 1084 1085 if (ret != 0) 1086 return ret; 1087 1088 atomic_inc(&stor_device->num_outstanding_req); 1089 1090 return ret; 1091 } 1092 1093 static int storvsc_device_alloc(struct scsi_device *sdevice) 1094 { 1095 struct stor_mem_pools *memp; 1096 int number = STORVSC_MIN_BUF_NR; 1097 1098 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); 1099 if (!memp) 1100 return -ENOMEM; 1101 1102 memp->request_pool = 1103 kmem_cache_create(dev_name(&sdevice->sdev_dev), 1104 sizeof(struct storvsc_cmd_request), 0, 1105 SLAB_HWCACHE_ALIGN, NULL); 1106 1107 if (!memp->request_pool) 1108 goto err0; 1109 1110 memp->request_mempool = mempool_create(number, mempool_alloc_slab, 1111 mempool_free_slab, 1112 memp->request_pool); 1113 1114 if (!memp->request_mempool) 1115 goto err1; 1116 1117 sdevice->hostdata = memp; 1118 1119 return 0; 1120 1121 err1: 1122 kmem_cache_destroy(memp->request_pool); 1123 1124 err0: 1125 kfree(memp); 1126 return -ENOMEM; 1127 } 1128 1129 static void storvsc_device_destroy(struct scsi_device *sdevice) 1130 { 1131 struct stor_mem_pools *memp = sdevice->hostdata; 1132 1133 mempool_destroy(memp->request_mempool); 1134 kmem_cache_destroy(memp->request_pool); 1135 kfree(memp); 1136 sdevice->hostdata = NULL; 1137 } 1138 1139 static int storvsc_device_configure(struct scsi_device *sdevice) 1140 { 1141 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, 1142 STORVSC_MAX_IO_REQUESTS); 1143 1144 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); 1145 1146 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); 1147 1148 return 0; 1149 } 1150 1151 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1152 sector_t capacity, int *info) 1153 { 1154 sector_t nsect = capacity; 1155 sector_t cylinders = nsect; 1156 int heads, sectors_pt; 1157 1158 /* 1159 * We are making up these values; let us keep it simple. 1160 */ 1161 heads = 0xff; 1162 sectors_pt = 0x3f; /* Sectors per track */ 1163 sector_div(cylinders, heads * sectors_pt); 1164 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1165 cylinders = 0xffff; 1166 1167 info[0] = heads; 1168 info[1] = sectors_pt; 1169 info[2] = (int)cylinders; 1170 1171 return 0; 1172 } 1173 1174 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1175 { 1176 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1177 struct hv_device *device = host_dev->dev; 1178 1179 struct storvsc_device *stor_device; 1180 struct storvsc_cmd_request *request; 1181 struct vstor_packet *vstor_packet; 1182 int ret, t; 1183 1184 1185 stor_device = get_out_stor_device(device); 1186 if (!stor_device) 1187 return FAILED; 1188 1189 request = &stor_device->reset_request; 1190 vstor_packet = &request->vstor_packet; 1191 1192 init_completion(&request->wait_event); 1193 1194 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1195 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1196 vstor_packet->vm_srb.path_id = stor_device->path_id; 1197 1198 ret = vmbus_sendpacket(device->channel, vstor_packet, 1199 sizeof(struct vstor_packet), 1200 (unsigned long)&stor_device->reset_request, 1201 VM_PKT_DATA_INBAND, 1202 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1203 if (ret != 0) 1204 return FAILED; 1205 1206 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1207 if (t == 0) 1208 return TIMEOUT_ERROR; 1209 1210 1211 /* 1212 * At this point, all outstanding requests in the adapter 1213 * should have been flushed out and return to us 1214 */ 1215 1216 return SUCCESS; 1217 } 1218 1219 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1220 { 1221 bool allowed = true; 1222 u8 scsi_op = scmnd->cmnd[0]; 1223 1224 switch (scsi_op) { 1225 /* 1226 * smartd sends this command and the host does not handle 1227 * this. So, don't send it. 1228 */ 1229 case SET_WINDOW: 1230 scmnd->result = ILLEGAL_REQUEST << 16; 1231 allowed = false; 1232 break; 1233 default: 1234 break; 1235 } 1236 return allowed; 1237 } 1238 1239 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1240 { 1241 int ret; 1242 struct hv_host_device *host_dev = shost_priv(host); 1243 struct hv_device *dev = host_dev->dev; 1244 struct storvsc_cmd_request *cmd_request; 1245 unsigned int request_size = 0; 1246 int i; 1247 struct scatterlist *sgl; 1248 unsigned int sg_count = 0; 1249 struct vmscsi_request *vm_srb; 1250 struct stor_mem_pools *memp = scmnd->device->hostdata; 1251 1252 if (!storvsc_scsi_cmd_ok(scmnd)) { 1253 scmnd->scsi_done(scmnd); 1254 return 0; 1255 } 1256 1257 request_size = sizeof(struct storvsc_cmd_request); 1258 1259 cmd_request = mempool_alloc(memp->request_mempool, 1260 GFP_ATOMIC); 1261 1262 /* 1263 * We might be invoked in an interrupt context; hence 1264 * mempool_alloc() can fail. 1265 */ 1266 if (!cmd_request) 1267 return SCSI_MLQUEUE_DEVICE_BUSY; 1268 1269 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); 1270 1271 /* Setup the cmd request */ 1272 cmd_request->cmd = scmnd; 1273 1274 scmnd->host_scribble = (unsigned char *)cmd_request; 1275 1276 vm_srb = &cmd_request->vstor_packet.vm_srb; 1277 1278 1279 /* Build the SRB */ 1280 switch (scmnd->sc_data_direction) { 1281 case DMA_TO_DEVICE: 1282 vm_srb->data_in = WRITE_TYPE; 1283 break; 1284 case DMA_FROM_DEVICE: 1285 vm_srb->data_in = READ_TYPE; 1286 break; 1287 default: 1288 vm_srb->data_in = UNKNOWN_TYPE; 1289 break; 1290 } 1291 1292 1293 vm_srb->port_number = host_dev->port; 1294 vm_srb->path_id = scmnd->device->channel; 1295 vm_srb->target_id = scmnd->device->id; 1296 vm_srb->lun = scmnd->device->lun; 1297 1298 vm_srb->cdb_length = scmnd->cmd_len; 1299 1300 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1301 1302 cmd_request->sense_buffer = scmnd->sense_buffer; 1303 1304 1305 cmd_request->data_buffer.len = scsi_bufflen(scmnd); 1306 if (scsi_sg_count(scmnd)) { 1307 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1308 sg_count = scsi_sg_count(scmnd); 1309 1310 /* check if we need to bounce the sgl */ 1311 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { 1312 cmd_request->bounce_sgl = 1313 create_bounce_buffer(sgl, scsi_sg_count(scmnd), 1314 scsi_bufflen(scmnd), 1315 vm_srb->data_in); 1316 if (!cmd_request->bounce_sgl) { 1317 ret = SCSI_MLQUEUE_HOST_BUSY; 1318 goto queue_error; 1319 } 1320 1321 cmd_request->bounce_sgl_count = 1322 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> 1323 PAGE_SHIFT; 1324 1325 if (vm_srb->data_in == WRITE_TYPE) 1326 copy_to_bounce_buffer(sgl, 1327 cmd_request->bounce_sgl, 1328 scsi_sg_count(scmnd)); 1329 1330 sgl = cmd_request->bounce_sgl; 1331 sg_count = cmd_request->bounce_sgl_count; 1332 } 1333 1334 cmd_request->data_buffer.offset = sgl[0].offset; 1335 1336 for (i = 0; i < sg_count; i++) 1337 cmd_request->data_buffer.pfn_array[i] = 1338 page_to_pfn(sg_page((&sgl[i]))); 1339 1340 } else if (scsi_sglist(scmnd)) { 1341 cmd_request->data_buffer.offset = 1342 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); 1343 cmd_request->data_buffer.pfn_array[0] = 1344 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; 1345 } 1346 1347 /* Invokes the vsc to start an IO */ 1348 ret = storvsc_do_io(dev, cmd_request); 1349 1350 if (ret == -EAGAIN) { 1351 /* no more space */ 1352 1353 if (cmd_request->bounce_sgl_count) { 1354 destroy_bounce_buffer(cmd_request->bounce_sgl, 1355 cmd_request->bounce_sgl_count); 1356 1357 ret = SCSI_MLQUEUE_DEVICE_BUSY; 1358 goto queue_error; 1359 } 1360 } 1361 1362 return 0; 1363 1364 queue_error: 1365 mempool_free(cmd_request, memp->request_mempool); 1366 scmnd->host_scribble = NULL; 1367 return ret; 1368 } 1369 1370 static struct scsi_host_template scsi_driver = { 1371 .module = THIS_MODULE, 1372 .name = "storvsc_host_t", 1373 .bios_param = storvsc_get_chs, 1374 .queuecommand = storvsc_queuecommand, 1375 .eh_host_reset_handler = storvsc_host_reset_handler, 1376 .slave_alloc = storvsc_device_alloc, 1377 .slave_destroy = storvsc_device_destroy, 1378 .slave_configure = storvsc_device_configure, 1379 .cmd_per_lun = 1, 1380 /* 64 max_queue * 1 target */ 1381 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, 1382 .this_id = -1, 1383 /* no use setting to 0 since ll_blk_rw reset it to 1 */ 1384 /* currently 32 */ 1385 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, 1386 .use_clustering = DISABLE_CLUSTERING, 1387 /* Make sure we dont get a sg segment crosses a page boundary */ 1388 .dma_boundary = PAGE_SIZE-1, 1389 }; 1390 1391 enum { 1392 SCSI_GUID, 1393 IDE_GUID, 1394 }; 1395 1396 static const struct hv_vmbus_device_id id_table[] = { 1397 /* SCSI guid */ 1398 { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, 1399 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) 1400 .driver_data = SCSI_GUID }, 1401 /* IDE guid */ 1402 { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, 1403 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) 1404 .driver_data = IDE_GUID }, 1405 { }, 1406 }; 1407 1408 MODULE_DEVICE_TABLE(vmbus, id_table); 1409 1410 static int storvsc_probe(struct hv_device *device, 1411 const struct hv_vmbus_device_id *dev_id) 1412 { 1413 int ret; 1414 struct Scsi_Host *host; 1415 struct hv_host_device *host_dev; 1416 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1417 int target = 0; 1418 struct storvsc_device *stor_device; 1419 1420 host = scsi_host_alloc(&scsi_driver, 1421 sizeof(struct hv_host_device)); 1422 if (!host) 1423 return -ENOMEM; 1424 1425 host_dev = shost_priv(host); 1426 memset(host_dev, 0, sizeof(struct hv_host_device)); 1427 1428 host_dev->port = host->host_no; 1429 host_dev->dev = device; 1430 1431 1432 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1433 if (!stor_device) { 1434 ret = -ENOMEM; 1435 goto err_out0; 1436 } 1437 1438 stor_device->destroy = false; 1439 init_waitqueue_head(&stor_device->waiting_to_drain); 1440 stor_device->device = device; 1441 stor_device->host = host; 1442 hv_set_drvdata(device, stor_device); 1443 1444 stor_device->port_number = host->host_no; 1445 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); 1446 if (ret) 1447 goto err_out1; 1448 1449 host_dev->path = stor_device->path_id; 1450 host_dev->target = stor_device->target_id; 1451 1452 /* max # of devices per target */ 1453 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; 1454 /* max # of targets per channel */ 1455 host->max_id = STORVSC_MAX_TARGETS; 1456 /* max # of channels */ 1457 host->max_channel = STORVSC_MAX_CHANNELS - 1; 1458 /* max cmd length */ 1459 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1460 1461 /* Register the HBA and start the scsi bus scan */ 1462 ret = scsi_add_host(host, &device->device); 1463 if (ret != 0) 1464 goto err_out2; 1465 1466 if (!dev_is_ide) { 1467 scsi_scan_host(host); 1468 } else { 1469 target = (device->dev_instance.b[5] << 8 | 1470 device->dev_instance.b[4]); 1471 ret = scsi_add_device(host, 0, target, 0); 1472 if (ret) { 1473 scsi_remove_host(host); 1474 goto err_out2; 1475 } 1476 } 1477 return 0; 1478 1479 err_out2: 1480 /* 1481 * Once we have connected with the host, we would need to 1482 * to invoke storvsc_dev_remove() to rollback this state and 1483 * this call also frees up the stor_device; hence the jump around 1484 * err_out1 label. 1485 */ 1486 storvsc_dev_remove(device); 1487 goto err_out0; 1488 1489 err_out1: 1490 kfree(stor_device); 1491 1492 err_out0: 1493 scsi_host_put(host); 1494 return ret; 1495 } 1496 1497 static int storvsc_remove(struct hv_device *dev) 1498 { 1499 struct storvsc_device *stor_device = hv_get_drvdata(dev); 1500 struct Scsi_Host *host = stor_device->host; 1501 1502 scsi_remove_host(host); 1503 storvsc_dev_remove(dev); 1504 scsi_host_put(host); 1505 1506 return 0; 1507 } 1508 1509 static struct hv_driver storvsc_drv = { 1510 .name = KBUILD_MODNAME, 1511 .id_table = id_table, 1512 .probe = storvsc_probe, 1513 .remove = storvsc_remove, 1514 }; 1515 1516 static int __init storvsc_drv_init(void) 1517 { 1518 u32 max_outstanding_req_per_channel; 1519 1520 /* 1521 * Divide the ring buffer data size (which is 1 page less 1522 * than the ring buffer size since that page is reserved for 1523 * the ring buffer indices) by the max request size (which is 1524 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 1525 */ 1526 max_outstanding_req_per_channel = 1527 ((storvsc_ringbuffer_size - PAGE_SIZE) / 1528 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 1529 sizeof(struct vstor_packet) + sizeof(u64), 1530 sizeof(u64))); 1531 1532 if (max_outstanding_req_per_channel < 1533 STORVSC_MAX_IO_REQUESTS) 1534 return -EINVAL; 1535 1536 return vmbus_driver_register(&storvsc_drv); 1537 } 1538 1539 static void __exit storvsc_drv_exit(void) 1540 { 1541 vmbus_driver_unregister(&storvsc_drv); 1542 } 1543 1544 MODULE_LICENSE("GPL"); 1545 MODULE_VERSION(HV_DRV_VERSION); 1546 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 1547 module_init(storvsc_drv_init); 1548 module_exit(storvsc_drv_exit); 1549