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/blkdev.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 * Win8: 5.1 59 * Win8.1: 6.0 60 * Win10: 6.2 61 */ 62 63 #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ 64 (((MINOR_) & 0xff))) 65 66 #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) 67 #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) 68 #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) 69 #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) 70 #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) 71 72 /* Packet structure describing virtual storage requests. */ 73 enum vstor_packet_operation { 74 VSTOR_OPERATION_COMPLETE_IO = 1, 75 VSTOR_OPERATION_REMOVE_DEVICE = 2, 76 VSTOR_OPERATION_EXECUTE_SRB = 3, 77 VSTOR_OPERATION_RESET_LUN = 4, 78 VSTOR_OPERATION_RESET_ADAPTER = 5, 79 VSTOR_OPERATION_RESET_BUS = 6, 80 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, 81 VSTOR_OPERATION_END_INITIALIZATION = 8, 82 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, 83 VSTOR_OPERATION_QUERY_PROPERTIES = 10, 84 VSTOR_OPERATION_ENUMERATE_BUS = 11, 85 VSTOR_OPERATION_FCHBA_DATA = 12, 86 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, 87 VSTOR_OPERATION_MAXIMUM = 13 88 }; 89 90 /* 91 * WWN packet for Fibre Channel HBA 92 */ 93 94 struct hv_fc_wwn_packet { 95 bool primary_active; 96 u8 reserved1; 97 u8 reserved2; 98 u8 primary_port_wwn[8]; 99 u8 primary_node_wwn[8]; 100 u8 secondary_port_wwn[8]; 101 u8 secondary_node_wwn[8]; 102 }; 103 104 105 106 /* 107 * SRB Flag Bits 108 */ 109 110 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 111 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 112 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 113 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 114 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 115 #define SRB_FLAGS_DATA_IN 0x00000040 116 #define SRB_FLAGS_DATA_OUT 0x00000080 117 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 118 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) 119 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 120 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 121 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 122 123 /* 124 * This flag indicates the request is part of the workflow for processing a D3. 125 */ 126 #define SRB_FLAGS_D3_PROCESSING 0x00000800 127 #define SRB_FLAGS_IS_ACTIVE 0x00010000 128 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 129 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 130 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 131 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 132 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 133 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 134 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 135 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 136 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 137 138 139 /* 140 * Platform neutral description of a scsi request - 141 * this remains the same across the write regardless of 32/64 bit 142 * note: it's patterned off the SCSI_PASS_THROUGH structure 143 */ 144 #define STORVSC_MAX_CMD_LEN 0x10 145 146 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 147 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 148 149 #define STORVSC_SENSE_BUFFER_SIZE 0x14 150 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 151 152 /* 153 * Sense buffer size changed in win8; have a run-time 154 * variable to track the size we should use. This value will 155 * likely change during protocol negotiation but it is valid 156 * to start by assuming pre-Win8. 157 */ 158 static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; 159 160 /* 161 * The storage protocol version is determined during the 162 * initial exchange with the host. It will indicate which 163 * storage functionality is available in the host. 164 */ 165 static int vmstor_proto_version; 166 167 struct vmscsi_win8_extension { 168 /* 169 * The following were added in Windows 8 170 */ 171 u16 reserve; 172 u8 queue_tag; 173 u8 queue_action; 174 u32 srb_flags; 175 u32 time_out_value; 176 u32 queue_sort_ey; 177 } __packed; 178 179 struct vmscsi_request { 180 u16 length; 181 u8 srb_status; 182 u8 scsi_status; 183 184 u8 port_number; 185 u8 path_id; 186 u8 target_id; 187 u8 lun; 188 189 u8 cdb_length; 190 u8 sense_info_length; 191 u8 data_in; 192 u8 reserved; 193 194 u32 data_transfer_length; 195 196 union { 197 u8 cdb[STORVSC_MAX_CMD_LEN]; 198 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; 199 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; 200 }; 201 /* 202 * The following was added in win8. 203 */ 204 struct vmscsi_win8_extension win8_extension; 205 206 } __attribute((packed)); 207 208 209 /* 210 * The size of the vmscsi_request has changed in win8. The 211 * additional size is because of new elements added to the 212 * structure. These elements are valid only when we are talking 213 * to a win8 host. 214 * Track the correction to size we need to apply. This value 215 * will likely change during protocol negotiation but it is 216 * valid to start by assuming pre-Win8. 217 */ 218 static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 219 220 /* 221 * The list of storage protocols in order of preference. 222 */ 223 struct vmstor_protocol { 224 int protocol_version; 225 int sense_buffer_size; 226 int vmscsi_size_delta; 227 }; 228 229 230 static const struct vmstor_protocol vmstor_protocols[] = { 231 { 232 VMSTOR_PROTO_VERSION_WIN10, 233 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 234 0 235 }, 236 { 237 VMSTOR_PROTO_VERSION_WIN8_1, 238 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 239 0 240 }, 241 { 242 VMSTOR_PROTO_VERSION_WIN8, 243 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 244 0 245 }, 246 { 247 VMSTOR_PROTO_VERSION_WIN7, 248 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 249 sizeof(struct vmscsi_win8_extension), 250 }, 251 { 252 VMSTOR_PROTO_VERSION_WIN6, 253 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 254 sizeof(struct vmscsi_win8_extension), 255 } 256 }; 257 258 259 /* 260 * This structure is sent during the intialization phase to get the different 261 * properties of the channel. 262 */ 263 264 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 265 266 struct vmstorage_channel_properties { 267 u32 reserved; 268 u16 max_channel_cnt; 269 u16 reserved1; 270 271 u32 flags; 272 u32 max_transfer_bytes; 273 274 u64 reserved2; 275 } __packed; 276 277 /* This structure is sent during the storage protocol negotiations. */ 278 struct vmstorage_protocol_version { 279 /* Major (MSW) and minor (LSW) version numbers. */ 280 u16 major_minor; 281 282 /* 283 * Revision number is auto-incremented whenever this file is changed 284 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 285 * definitely indicate incompatibility--but it does indicate mismatched 286 * builds. 287 * This is only used on the windows side. Just set it to 0. 288 */ 289 u16 revision; 290 } __packed; 291 292 /* Channel Property Flags */ 293 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 294 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 295 296 struct vstor_packet { 297 /* Requested operation type */ 298 enum vstor_packet_operation operation; 299 300 /* Flags - see below for values */ 301 u32 flags; 302 303 /* Status of the request returned from the server side. */ 304 u32 status; 305 306 /* Data payload area */ 307 union { 308 /* 309 * Structure used to forward SCSI commands from the 310 * client to the server. 311 */ 312 struct vmscsi_request vm_srb; 313 314 /* Structure used to query channel properties. */ 315 struct vmstorage_channel_properties storage_channel_properties; 316 317 /* Used during version negotiations. */ 318 struct vmstorage_protocol_version version; 319 320 /* Fibre channel address packet */ 321 struct hv_fc_wwn_packet wwn_packet; 322 323 /* Number of sub-channels to create */ 324 u16 sub_channel_count; 325 326 /* This will be the maximum of the union members */ 327 u8 buffer[0x34]; 328 }; 329 } __packed; 330 331 /* 332 * Packet Flags: 333 * 334 * This flag indicates that the server should send back a completion for this 335 * packet. 336 */ 337 338 #define REQUEST_COMPLETION_FLAG 0x1 339 340 /* Matches Windows-end */ 341 enum storvsc_request_type { 342 WRITE_TYPE = 0, 343 READ_TYPE, 344 UNKNOWN_TYPE, 345 }; 346 347 /* 348 * SRB status codes and masks; a subset of the codes used here. 349 */ 350 351 #define SRB_STATUS_AUTOSENSE_VALID 0x80 352 #define SRB_STATUS_QUEUE_FROZEN 0x40 353 #define SRB_STATUS_INVALID_LUN 0x20 354 #define SRB_STATUS_SUCCESS 0x01 355 #define SRB_STATUS_ABORTED 0x02 356 #define SRB_STATUS_ERROR 0x04 357 358 #define SRB_STATUS(status) \ 359 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) 360 /* 361 * This is the end of Protocol specific defines. 362 */ 363 364 static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); 365 static u32 max_outstanding_req_per_channel; 366 367 static int storvsc_vcpus_per_sub_channel = 4; 368 369 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 370 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 371 372 module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); 373 MODULE_PARM_DESC(vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); 374 /* 375 * Timeout in seconds for all devices managed by this driver. 376 */ 377 static int storvsc_timeout = 180; 378 379 static int msft_blist_flags = BLIST_TRY_VPD_PAGES; 380 381 382 static void storvsc_on_channel_callback(void *context); 383 384 #define STORVSC_MAX_LUNS_PER_TARGET 255 385 #define STORVSC_MAX_TARGETS 2 386 #define STORVSC_MAX_CHANNELS 8 387 388 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 389 #define STORVSC_FC_MAX_TARGETS 128 390 #define STORVSC_FC_MAX_CHANNELS 8 391 392 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 393 #define STORVSC_IDE_MAX_TARGETS 1 394 #define STORVSC_IDE_MAX_CHANNELS 1 395 396 struct storvsc_cmd_request { 397 struct scsi_cmnd *cmd; 398 399 struct hv_device *device; 400 401 /* Synchronize the request/response if needed */ 402 struct completion wait_event; 403 404 struct vmbus_channel_packet_multipage_buffer mpb; 405 struct vmbus_packet_mpb_array *payload; 406 u32 payload_sz; 407 408 struct vstor_packet vstor_packet; 409 }; 410 411 412 /* A storvsc device is a device object that contains a vmbus channel */ 413 struct storvsc_device { 414 struct hv_device *device; 415 416 bool destroy; 417 bool drain_notify; 418 bool open_sub_channel; 419 atomic_t num_outstanding_req; 420 struct Scsi_Host *host; 421 422 wait_queue_head_t waiting_to_drain; 423 424 /* 425 * Each unique Port/Path/Target represents 1 channel ie scsi 426 * controller. In reality, the pathid, targetid is always 0 427 * and the port is set by us 428 */ 429 unsigned int port_number; 430 unsigned char path_id; 431 unsigned char target_id; 432 433 /* 434 * Max I/O, the device can support. 435 */ 436 u32 max_transfer_bytes; 437 /* Used for vsc/vsp channel reset process */ 438 struct storvsc_cmd_request init_request; 439 struct storvsc_cmd_request reset_request; 440 }; 441 442 struct hv_host_device { 443 struct hv_device *dev; 444 unsigned int port; 445 unsigned char path; 446 unsigned char target; 447 }; 448 449 struct storvsc_scan_work { 450 struct work_struct work; 451 struct Scsi_Host *host; 452 uint lun; 453 }; 454 455 static void storvsc_device_scan(struct work_struct *work) 456 { 457 struct storvsc_scan_work *wrk; 458 uint lun; 459 struct scsi_device *sdev; 460 461 wrk = container_of(work, struct storvsc_scan_work, work); 462 lun = wrk->lun; 463 464 sdev = scsi_device_lookup(wrk->host, 0, 0, lun); 465 if (!sdev) 466 goto done; 467 scsi_rescan_device(&sdev->sdev_gendev); 468 scsi_device_put(sdev); 469 470 done: 471 kfree(wrk); 472 } 473 474 static void storvsc_host_scan(struct work_struct *work) 475 { 476 struct storvsc_scan_work *wrk; 477 struct Scsi_Host *host; 478 struct scsi_device *sdev; 479 480 wrk = container_of(work, struct storvsc_scan_work, work); 481 host = wrk->host; 482 483 /* 484 * Before scanning the host, first check to see if any of the 485 * currrently known devices have been hot removed. We issue a 486 * "unit ready" command against all currently known devices. 487 * This I/O will result in an error for devices that have been 488 * removed. As part of handling the I/O error, we remove the device. 489 * 490 * When a LUN is added or removed, the host sends us a signal to 491 * scan the host. Thus we are forced to discover the LUNs that 492 * may have been removed this way. 493 */ 494 mutex_lock(&host->scan_mutex); 495 shost_for_each_device(sdev, host) 496 scsi_test_unit_ready(sdev, 1, 1, NULL); 497 mutex_unlock(&host->scan_mutex); 498 /* 499 * Now scan the host to discover LUNs that may have been added. 500 */ 501 scsi_scan_host(host); 502 503 kfree(wrk); 504 } 505 506 static void storvsc_remove_lun(struct work_struct *work) 507 { 508 struct storvsc_scan_work *wrk; 509 struct scsi_device *sdev; 510 511 wrk = container_of(work, struct storvsc_scan_work, work); 512 if (!scsi_host_get(wrk->host)) 513 goto done; 514 515 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); 516 517 if (sdev) { 518 scsi_remove_device(sdev); 519 scsi_device_put(sdev); 520 } 521 scsi_host_put(wrk->host); 522 523 done: 524 kfree(wrk); 525 } 526 527 528 /* 529 * We can get incoming messages from the host that are not in response to 530 * messages that we have sent out. An example of this would be messages 531 * received by the guest to notify dynamic addition/removal of LUNs. To 532 * deal with potential race conditions where the driver may be in the 533 * midst of being unloaded when we might receive an unsolicited message 534 * from the host, we have implemented a mechanism to gurantee sequential 535 * consistency: 536 * 537 * 1) Once the device is marked as being destroyed, we will fail all 538 * outgoing messages. 539 * 2) We permit incoming messages when the device is being destroyed, 540 * only to properly account for messages already sent out. 541 */ 542 543 static inline struct storvsc_device *get_out_stor_device( 544 struct hv_device *device) 545 { 546 struct storvsc_device *stor_device; 547 548 stor_device = hv_get_drvdata(device); 549 550 if (stor_device && stor_device->destroy) 551 stor_device = NULL; 552 553 return stor_device; 554 } 555 556 557 static inline void storvsc_wait_to_drain(struct storvsc_device *dev) 558 { 559 dev->drain_notify = true; 560 wait_event(dev->waiting_to_drain, 561 atomic_read(&dev->num_outstanding_req) == 0); 562 dev->drain_notify = false; 563 } 564 565 static inline struct storvsc_device *get_in_stor_device( 566 struct hv_device *device) 567 { 568 struct storvsc_device *stor_device; 569 570 stor_device = hv_get_drvdata(device); 571 572 if (!stor_device) 573 goto get_in_err; 574 575 /* 576 * If the device is being destroyed; allow incoming 577 * traffic only to cleanup outstanding requests. 578 */ 579 580 if (stor_device->destroy && 581 (atomic_read(&stor_device->num_outstanding_req) == 0)) 582 stor_device = NULL; 583 584 get_in_err: 585 return stor_device; 586 587 } 588 589 static void handle_sc_creation(struct vmbus_channel *new_sc) 590 { 591 struct hv_device *device = new_sc->primary_channel->device_obj; 592 struct storvsc_device *stor_device; 593 struct vmstorage_channel_properties props; 594 595 stor_device = get_out_stor_device(device); 596 if (!stor_device) 597 return; 598 599 if (stor_device->open_sub_channel == false) 600 return; 601 602 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 603 604 vmbus_open(new_sc, 605 storvsc_ringbuffer_size, 606 storvsc_ringbuffer_size, 607 (void *)&props, 608 sizeof(struct vmstorage_channel_properties), 609 storvsc_on_channel_callback, new_sc); 610 } 611 612 static void handle_multichannel_storage(struct hv_device *device, int max_chns) 613 { 614 struct storvsc_device *stor_device; 615 int num_cpus = num_online_cpus(); 616 int num_sc; 617 struct storvsc_cmd_request *request; 618 struct vstor_packet *vstor_packet; 619 int ret, t; 620 621 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); 622 stor_device = get_out_stor_device(device); 623 if (!stor_device) 624 return; 625 626 request = &stor_device->init_request; 627 vstor_packet = &request->vstor_packet; 628 629 stor_device->open_sub_channel = true; 630 /* 631 * Establish a handler for dealing with subchannels. 632 */ 633 vmbus_set_sc_create_callback(device->channel, handle_sc_creation); 634 635 /* 636 * Check to see if sub-channels have already been created. This 637 * can happen when this driver is re-loaded after unloading. 638 */ 639 640 if (vmbus_are_subchannels_present(device->channel)) 641 return; 642 643 stor_device->open_sub_channel = false; 644 /* 645 * Request the host to create sub-channels. 646 */ 647 memset(request, 0, sizeof(struct storvsc_cmd_request)); 648 init_completion(&request->wait_event); 649 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; 650 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 651 vstor_packet->sub_channel_count = num_sc; 652 653 ret = vmbus_sendpacket(device->channel, vstor_packet, 654 (sizeof(struct vstor_packet) - 655 vmscsi_size_delta), 656 (unsigned long)request, 657 VM_PKT_DATA_INBAND, 658 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 659 660 if (ret != 0) 661 return; 662 663 t = wait_for_completion_timeout(&request->wait_event, 10*HZ); 664 if (t == 0) 665 return; 666 667 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 668 vstor_packet->status != 0) 669 return; 670 671 /* 672 * Now that we created the sub-channels, invoke the check; this 673 * may trigger the callback. 674 */ 675 stor_device->open_sub_channel = true; 676 vmbus_are_subchannels_present(device->channel); 677 } 678 679 static int storvsc_channel_init(struct hv_device *device) 680 { 681 struct storvsc_device *stor_device; 682 struct storvsc_cmd_request *request; 683 struct vstor_packet *vstor_packet; 684 int ret, t, i; 685 int max_chns; 686 bool process_sub_channels = false; 687 688 stor_device = get_out_stor_device(device); 689 if (!stor_device) 690 return -ENODEV; 691 692 request = &stor_device->init_request; 693 vstor_packet = &request->vstor_packet; 694 695 /* 696 * Now, initiate the vsc/vsp initialization protocol on the open 697 * channel 698 */ 699 memset(request, 0, sizeof(struct storvsc_cmd_request)); 700 init_completion(&request->wait_event); 701 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 702 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 703 704 ret = vmbus_sendpacket(device->channel, vstor_packet, 705 (sizeof(struct vstor_packet) - 706 vmscsi_size_delta), 707 (unsigned long)request, 708 VM_PKT_DATA_INBAND, 709 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 710 if (ret != 0) 711 goto cleanup; 712 713 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 714 if (t == 0) { 715 ret = -ETIMEDOUT; 716 goto cleanup; 717 } 718 719 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 720 vstor_packet->status != 0) { 721 ret = -EINVAL; 722 goto cleanup; 723 } 724 725 726 for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { 727 /* reuse the packet for version range supported */ 728 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 729 vstor_packet->operation = 730 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 731 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 732 733 vstor_packet->version.major_minor = 734 vmstor_protocols[i].protocol_version; 735 736 /* 737 * The revision number is only used in Windows; set it to 0. 738 */ 739 vstor_packet->version.revision = 0; 740 741 ret = vmbus_sendpacket(device->channel, vstor_packet, 742 (sizeof(struct vstor_packet) - 743 vmscsi_size_delta), 744 (unsigned long)request, 745 VM_PKT_DATA_INBAND, 746 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 747 if (ret != 0) 748 goto cleanup; 749 750 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 751 if (t == 0) { 752 ret = -ETIMEDOUT; 753 goto cleanup; 754 } 755 756 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) { 757 ret = -EINVAL; 758 goto cleanup; 759 } 760 761 if (vstor_packet->status == 0) { 762 vmstor_proto_version = 763 vmstor_protocols[i].protocol_version; 764 765 sense_buffer_size = 766 vmstor_protocols[i].sense_buffer_size; 767 768 vmscsi_size_delta = 769 vmstor_protocols[i].vmscsi_size_delta; 770 771 break; 772 } 773 } 774 775 if (vstor_packet->status != 0) { 776 ret = -EINVAL; 777 goto cleanup; 778 } 779 780 781 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 782 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 783 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 784 785 ret = vmbus_sendpacket(device->channel, vstor_packet, 786 (sizeof(struct vstor_packet) - 787 vmscsi_size_delta), 788 (unsigned long)request, 789 VM_PKT_DATA_INBAND, 790 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 791 792 if (ret != 0) 793 goto cleanup; 794 795 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 796 if (t == 0) { 797 ret = -ETIMEDOUT; 798 goto cleanup; 799 } 800 801 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 802 vstor_packet->status != 0) { 803 ret = -EINVAL; 804 goto cleanup; 805 } 806 807 /* 808 * Check to see if multi-channel support is there. 809 * Hosts that implement protocol version of 5.1 and above 810 * support multi-channel. 811 */ 812 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; 813 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { 814 if (vstor_packet->storage_channel_properties.flags & 815 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) 816 process_sub_channels = true; 817 } 818 stor_device->max_transfer_bytes = 819 vstor_packet->storage_channel_properties.max_transfer_bytes; 820 821 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 822 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 823 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 824 825 ret = vmbus_sendpacket(device->channel, vstor_packet, 826 (sizeof(struct vstor_packet) - 827 vmscsi_size_delta), 828 (unsigned long)request, 829 VM_PKT_DATA_INBAND, 830 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 831 832 if (ret != 0) 833 goto cleanup; 834 835 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 836 if (t == 0) { 837 ret = -ETIMEDOUT; 838 goto cleanup; 839 } 840 841 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 842 vstor_packet->status != 0) { 843 ret = -EINVAL; 844 goto cleanup; 845 } 846 847 if (process_sub_channels) 848 handle_multichannel_storage(device, max_chns); 849 850 851 cleanup: 852 return ret; 853 } 854 855 static void storvsc_handle_error(struct vmscsi_request *vm_srb, 856 struct scsi_cmnd *scmnd, 857 struct Scsi_Host *host, 858 u8 asc, u8 ascq) 859 { 860 struct storvsc_scan_work *wrk; 861 void (*process_err_fn)(struct work_struct *work); 862 bool do_work = false; 863 864 switch (SRB_STATUS(vm_srb->srb_status)) { 865 case SRB_STATUS_ERROR: 866 /* 867 * If there is an error; offline the device since all 868 * error recovery strategies would have already been 869 * deployed on the host side. However, if the command 870 * were a pass-through command deal with it appropriately. 871 */ 872 switch (scmnd->cmnd[0]) { 873 case ATA_16: 874 case ATA_12: 875 set_host_byte(scmnd, DID_PASSTHROUGH); 876 break; 877 /* 878 * On Some Windows hosts TEST_UNIT_READY command can return 879 * SRB_STATUS_ERROR, let the upper level code deal with it 880 * based on the sense information. 881 */ 882 case TEST_UNIT_READY: 883 break; 884 default: 885 set_host_byte(scmnd, DID_TARGET_FAILURE); 886 } 887 break; 888 case SRB_STATUS_INVALID_LUN: 889 do_work = true; 890 process_err_fn = storvsc_remove_lun; 891 break; 892 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): 893 if ((asc == 0x2a) && (ascq == 0x9)) { 894 do_work = true; 895 process_err_fn = storvsc_device_scan; 896 /* 897 * Retry the I/O that trigerred this. 898 */ 899 set_host_byte(scmnd, DID_REQUEUE); 900 } 901 break; 902 } 903 904 if (!do_work) 905 return; 906 907 /* 908 * We need to schedule work to process this error; schedule it. 909 */ 910 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 911 if (!wrk) { 912 set_host_byte(scmnd, DID_TARGET_FAILURE); 913 return; 914 } 915 916 wrk->host = host; 917 wrk->lun = vm_srb->lun; 918 INIT_WORK(&wrk->work, process_err_fn); 919 schedule_work(&wrk->work); 920 } 921 922 923 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) 924 { 925 struct scsi_cmnd *scmnd = cmd_request->cmd; 926 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 927 struct scsi_sense_hdr sense_hdr; 928 struct vmscsi_request *vm_srb; 929 struct Scsi_Host *host; 930 struct storvsc_device *stor_dev; 931 struct hv_device *dev = host_dev->dev; 932 u32 payload_sz = cmd_request->payload_sz; 933 void *payload = cmd_request->payload; 934 935 stor_dev = get_in_stor_device(dev); 936 host = stor_dev->host; 937 938 vm_srb = &cmd_request->vstor_packet.vm_srb; 939 940 scmnd->result = vm_srb->scsi_status; 941 942 if (scmnd->result) { 943 if (scsi_normalize_sense(scmnd->sense_buffer, 944 SCSI_SENSE_BUFFERSIZE, &sense_hdr)) 945 scsi_print_sense_hdr(scmnd->device, "storvsc", 946 &sense_hdr); 947 } 948 949 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) 950 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 951 sense_hdr.ascq); 952 953 scsi_set_resid(scmnd, 954 cmd_request->payload->range.len - 955 vm_srb->data_transfer_length); 956 957 scmnd->scsi_done(scmnd); 958 959 if (payload_sz > 960 sizeof(struct vmbus_channel_packet_multipage_buffer)) 961 kfree(payload); 962 } 963 964 static void storvsc_on_io_completion(struct hv_device *device, 965 struct vstor_packet *vstor_packet, 966 struct storvsc_cmd_request *request) 967 { 968 struct storvsc_device *stor_device; 969 struct vstor_packet *stor_pkt; 970 971 stor_device = hv_get_drvdata(device); 972 stor_pkt = &request->vstor_packet; 973 974 /* 975 * The current SCSI handling on the host side does 976 * not correctly handle: 977 * INQUIRY command with page code parameter set to 0x80 978 * MODE_SENSE command with cmd[2] == 0x1c 979 * 980 * Setup srb and scsi status so this won't be fatal. 981 * We do this so we can distinguish truly fatal failues 982 * (srb status == 0x4) and off-line the device in that case. 983 */ 984 985 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 986 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 987 vstor_packet->vm_srb.scsi_status = 0; 988 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 989 } 990 991 992 /* Copy over the status...etc */ 993 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 994 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 995 stor_pkt->vm_srb.sense_info_length = 996 vstor_packet->vm_srb.sense_info_length; 997 998 999 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1000 /* CHECK_CONDITION */ 1001 if (vstor_packet->vm_srb.srb_status & 1002 SRB_STATUS_AUTOSENSE_VALID) { 1003 /* autosense data available */ 1004 1005 memcpy(request->cmd->sense_buffer, 1006 vstor_packet->vm_srb.sense_data, 1007 vstor_packet->vm_srb.sense_info_length); 1008 1009 } 1010 } 1011 1012 stor_pkt->vm_srb.data_transfer_length = 1013 vstor_packet->vm_srb.data_transfer_length; 1014 1015 storvsc_command_completion(request); 1016 1017 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1018 stor_device->drain_notify) 1019 wake_up(&stor_device->waiting_to_drain); 1020 1021 1022 } 1023 1024 static void storvsc_on_receive(struct hv_device *device, 1025 struct vstor_packet *vstor_packet, 1026 struct storvsc_cmd_request *request) 1027 { 1028 struct storvsc_scan_work *work; 1029 struct storvsc_device *stor_device; 1030 1031 switch (vstor_packet->operation) { 1032 case VSTOR_OPERATION_COMPLETE_IO: 1033 storvsc_on_io_completion(device, vstor_packet, request); 1034 break; 1035 1036 case VSTOR_OPERATION_REMOVE_DEVICE: 1037 case VSTOR_OPERATION_ENUMERATE_BUS: 1038 stor_device = get_in_stor_device(device); 1039 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1040 if (!work) 1041 return; 1042 1043 INIT_WORK(&work->work, storvsc_host_scan); 1044 work->host = stor_device->host; 1045 schedule_work(&work->work); 1046 break; 1047 1048 default: 1049 break; 1050 } 1051 } 1052 1053 static void storvsc_on_channel_callback(void *context) 1054 { 1055 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1056 struct hv_device *device; 1057 struct storvsc_device *stor_device; 1058 u32 bytes_recvd; 1059 u64 request_id; 1060 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; 1061 struct storvsc_cmd_request *request; 1062 int ret; 1063 1064 if (channel->primary_channel != NULL) 1065 device = channel->primary_channel->device_obj; 1066 else 1067 device = channel->device_obj; 1068 1069 stor_device = get_in_stor_device(device); 1070 if (!stor_device) 1071 return; 1072 1073 do { 1074 ret = vmbus_recvpacket(channel, packet, 1075 ALIGN((sizeof(struct vstor_packet) - 1076 vmscsi_size_delta), 8), 1077 &bytes_recvd, &request_id); 1078 if (ret == 0 && bytes_recvd > 0) { 1079 1080 request = (struct storvsc_cmd_request *) 1081 (unsigned long)request_id; 1082 1083 if ((request == &stor_device->init_request) || 1084 (request == &stor_device->reset_request)) { 1085 1086 memcpy(&request->vstor_packet, packet, 1087 (sizeof(struct vstor_packet) - 1088 vmscsi_size_delta)); 1089 complete(&request->wait_event); 1090 } else { 1091 storvsc_on_receive(device, 1092 (struct vstor_packet *)packet, 1093 request); 1094 } 1095 } else { 1096 break; 1097 } 1098 } while (1); 1099 1100 return; 1101 } 1102 1103 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) 1104 { 1105 struct vmstorage_channel_properties props; 1106 int ret; 1107 1108 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1109 1110 ret = vmbus_open(device->channel, 1111 ring_size, 1112 ring_size, 1113 (void *)&props, 1114 sizeof(struct vmstorage_channel_properties), 1115 storvsc_on_channel_callback, device->channel); 1116 1117 if (ret != 0) 1118 return ret; 1119 1120 ret = storvsc_channel_init(device); 1121 1122 return ret; 1123 } 1124 1125 static int storvsc_dev_remove(struct hv_device *device) 1126 { 1127 struct storvsc_device *stor_device; 1128 unsigned long flags; 1129 1130 stor_device = hv_get_drvdata(device); 1131 1132 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1133 stor_device->destroy = true; 1134 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1135 1136 /* 1137 * At this point, all outbound traffic should be disable. We 1138 * only allow inbound traffic (responses) to proceed so that 1139 * outstanding requests can be completed. 1140 */ 1141 1142 storvsc_wait_to_drain(stor_device); 1143 1144 /* 1145 * Since we have already drained, we don't need to busy wait 1146 * as was done in final_release_stor_device() 1147 * Note that we cannot set the ext pointer to NULL until 1148 * we have drained - to drain the outgoing packets, we need to 1149 * allow incoming packets. 1150 */ 1151 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1152 hv_set_drvdata(device, NULL); 1153 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1154 1155 /* Close the channel */ 1156 vmbus_close(device->channel); 1157 1158 kfree(stor_device); 1159 return 0; 1160 } 1161 1162 static int storvsc_do_io(struct hv_device *device, 1163 struct storvsc_cmd_request *request) 1164 { 1165 struct storvsc_device *stor_device; 1166 struct vstor_packet *vstor_packet; 1167 struct vmbus_channel *outgoing_channel; 1168 int ret = 0; 1169 1170 vstor_packet = &request->vstor_packet; 1171 stor_device = get_out_stor_device(device); 1172 1173 if (!stor_device) 1174 return -ENODEV; 1175 1176 1177 request->device = device; 1178 /* 1179 * Select an an appropriate channel to send the request out. 1180 */ 1181 1182 outgoing_channel = vmbus_get_outgoing_channel(device->channel); 1183 1184 1185 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1186 1187 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1188 vmscsi_size_delta); 1189 1190 1191 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1192 1193 1194 vstor_packet->vm_srb.data_transfer_length = 1195 request->payload->range.len; 1196 1197 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1198 1199 if (request->payload->range.len) { 1200 1201 ret = vmbus_sendpacket_mpb_desc(outgoing_channel, 1202 request->payload, request->payload_sz, 1203 vstor_packet, 1204 (sizeof(struct vstor_packet) - 1205 vmscsi_size_delta), 1206 (unsigned long)request); 1207 } else { 1208 ret = vmbus_sendpacket(outgoing_channel, vstor_packet, 1209 (sizeof(struct vstor_packet) - 1210 vmscsi_size_delta), 1211 (unsigned long)request, 1212 VM_PKT_DATA_INBAND, 1213 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1214 } 1215 1216 if (ret != 0) 1217 return ret; 1218 1219 atomic_inc(&stor_device->num_outstanding_req); 1220 1221 return ret; 1222 } 1223 1224 static int storvsc_device_configure(struct scsi_device *sdevice) 1225 { 1226 1227 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); 1228 1229 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); 1230 1231 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1232 1233 /* Ensure there are no gaps in presented sgls */ 1234 blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1); 1235 1236 sdevice->no_write_same = 1; 1237 1238 /* 1239 * Add blist flags to permit the reading of the VPD pages even when 1240 * the target may claim SPC-2 compliance. MSFT targets currently 1241 * claim SPC-2 compliance while they implement post SPC-2 features. 1242 * With this patch we can correctly handle WRITE_SAME_16 issues. 1243 */ 1244 sdevice->sdev_bflags |= msft_blist_flags; 1245 1246 /* 1247 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 1248 * if the device is a MSFT virtual device. If the host is 1249 * WIN10 or newer, allow write_same. 1250 */ 1251 if (!strncmp(sdevice->vendor, "Msft", 4)) { 1252 switch (vmstor_proto_version) { 1253 case VMSTOR_PROTO_VERSION_WIN8: 1254 case VMSTOR_PROTO_VERSION_WIN8_1: 1255 sdevice->scsi_level = SCSI_SPC_3; 1256 break; 1257 } 1258 1259 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) 1260 sdevice->no_write_same = 0; 1261 } 1262 1263 return 0; 1264 } 1265 1266 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1267 sector_t capacity, int *info) 1268 { 1269 sector_t nsect = capacity; 1270 sector_t cylinders = nsect; 1271 int heads, sectors_pt; 1272 1273 /* 1274 * We are making up these values; let us keep it simple. 1275 */ 1276 heads = 0xff; 1277 sectors_pt = 0x3f; /* Sectors per track */ 1278 sector_div(cylinders, heads * sectors_pt); 1279 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1280 cylinders = 0xffff; 1281 1282 info[0] = heads; 1283 info[1] = sectors_pt; 1284 info[2] = (int)cylinders; 1285 1286 return 0; 1287 } 1288 1289 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1290 { 1291 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1292 struct hv_device *device = host_dev->dev; 1293 1294 struct storvsc_device *stor_device; 1295 struct storvsc_cmd_request *request; 1296 struct vstor_packet *vstor_packet; 1297 int ret, t; 1298 1299 1300 stor_device = get_out_stor_device(device); 1301 if (!stor_device) 1302 return FAILED; 1303 1304 request = &stor_device->reset_request; 1305 vstor_packet = &request->vstor_packet; 1306 1307 init_completion(&request->wait_event); 1308 1309 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1310 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1311 vstor_packet->vm_srb.path_id = stor_device->path_id; 1312 1313 ret = vmbus_sendpacket(device->channel, vstor_packet, 1314 (sizeof(struct vstor_packet) - 1315 vmscsi_size_delta), 1316 (unsigned long)&stor_device->reset_request, 1317 VM_PKT_DATA_INBAND, 1318 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1319 if (ret != 0) 1320 return FAILED; 1321 1322 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1323 if (t == 0) 1324 return TIMEOUT_ERROR; 1325 1326 1327 /* 1328 * At this point, all outstanding requests in the adapter 1329 * should have been flushed out and return to us 1330 * There is a potential race here where the host may be in 1331 * the process of responding when we return from here. 1332 * Just wait for all in-transit packets to be accounted for 1333 * before we return from here. 1334 */ 1335 storvsc_wait_to_drain(stor_device); 1336 1337 return SUCCESS; 1338 } 1339 1340 /* 1341 * The host guarantees to respond to each command, although I/O latencies might 1342 * be unbounded on Azure. Reset the timer unconditionally to give the host a 1343 * chance to perform EH. 1344 */ 1345 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) 1346 { 1347 return BLK_EH_RESET_TIMER; 1348 } 1349 1350 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1351 { 1352 bool allowed = true; 1353 u8 scsi_op = scmnd->cmnd[0]; 1354 1355 switch (scsi_op) { 1356 /* the host does not handle WRITE_SAME, log accident usage */ 1357 case WRITE_SAME: 1358 /* 1359 * smartd sends this command and the host does not handle 1360 * this. So, don't send it. 1361 */ 1362 case SET_WINDOW: 1363 scmnd->result = ILLEGAL_REQUEST << 16; 1364 allowed = false; 1365 break; 1366 default: 1367 break; 1368 } 1369 return allowed; 1370 } 1371 1372 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1373 { 1374 int ret; 1375 struct hv_host_device *host_dev = shost_priv(host); 1376 struct hv_device *dev = host_dev->dev; 1377 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); 1378 int i; 1379 struct scatterlist *sgl; 1380 unsigned int sg_count = 0; 1381 struct vmscsi_request *vm_srb; 1382 struct scatterlist *cur_sgl; 1383 struct vmbus_packet_mpb_array *payload; 1384 u32 payload_sz; 1385 u32 length; 1386 1387 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { 1388 /* 1389 * On legacy hosts filter unimplemented commands. 1390 * Future hosts are expected to correctly handle 1391 * unsupported commands. Furthermore, it is 1392 * possible that some of the currently 1393 * unsupported commands maybe supported in 1394 * future versions of the host. 1395 */ 1396 if (!storvsc_scsi_cmd_ok(scmnd)) { 1397 scmnd->scsi_done(scmnd); 1398 return 0; 1399 } 1400 } 1401 1402 /* Setup the cmd request */ 1403 cmd_request->cmd = scmnd; 1404 1405 vm_srb = &cmd_request->vstor_packet.vm_srb; 1406 vm_srb->win8_extension.time_out_value = 60; 1407 1408 vm_srb->win8_extension.srb_flags |= 1409 SRB_FLAGS_DISABLE_SYNCH_TRANSFER; 1410 1411 /* Build the SRB */ 1412 switch (scmnd->sc_data_direction) { 1413 case DMA_TO_DEVICE: 1414 vm_srb->data_in = WRITE_TYPE; 1415 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1416 break; 1417 case DMA_FROM_DEVICE: 1418 vm_srb->data_in = READ_TYPE; 1419 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1420 break; 1421 case DMA_NONE: 1422 vm_srb->data_in = UNKNOWN_TYPE; 1423 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; 1424 break; 1425 default: 1426 /* 1427 * This is DMA_BIDIRECTIONAL or something else we are never 1428 * supposed to see here. 1429 */ 1430 WARN(1, "Unexpected data direction: %d\n", 1431 scmnd->sc_data_direction); 1432 return -EINVAL; 1433 } 1434 1435 1436 vm_srb->port_number = host_dev->port; 1437 vm_srb->path_id = scmnd->device->channel; 1438 vm_srb->target_id = scmnd->device->id; 1439 vm_srb->lun = scmnd->device->lun; 1440 1441 vm_srb->cdb_length = scmnd->cmd_len; 1442 1443 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1444 1445 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1446 sg_count = scsi_sg_count(scmnd); 1447 1448 length = scsi_bufflen(scmnd); 1449 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; 1450 payload_sz = sizeof(cmd_request->mpb); 1451 1452 if (sg_count) { 1453 if (sg_count > MAX_PAGE_BUFFER_COUNT) { 1454 1455 payload_sz = (sg_count * sizeof(void *) + 1456 sizeof(struct vmbus_packet_mpb_array)); 1457 payload = kmalloc(payload_sz, GFP_ATOMIC); 1458 if (!payload) 1459 return SCSI_MLQUEUE_DEVICE_BUSY; 1460 } 1461 1462 payload->range.len = length; 1463 payload->range.offset = sgl[0].offset; 1464 1465 cur_sgl = sgl; 1466 for (i = 0; i < sg_count; i++) { 1467 payload->range.pfn_array[i] = 1468 page_to_pfn(sg_page((cur_sgl))); 1469 cur_sgl = sg_next(cur_sgl); 1470 } 1471 1472 } else if (scsi_sglist(scmnd)) { 1473 payload->range.len = length; 1474 payload->range.offset = 1475 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); 1476 payload->range.pfn_array[0] = 1477 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; 1478 } 1479 1480 cmd_request->payload = payload; 1481 cmd_request->payload_sz = payload_sz; 1482 1483 /* Invokes the vsc to start an IO */ 1484 ret = storvsc_do_io(dev, cmd_request); 1485 1486 if (ret == -EAGAIN) { 1487 /* no more space */ 1488 return SCSI_MLQUEUE_DEVICE_BUSY; 1489 } 1490 1491 return 0; 1492 } 1493 1494 static struct scsi_host_template scsi_driver = { 1495 .module = THIS_MODULE, 1496 .name = "storvsc_host_t", 1497 .cmd_size = sizeof(struct storvsc_cmd_request), 1498 .bios_param = storvsc_get_chs, 1499 .queuecommand = storvsc_queuecommand, 1500 .eh_host_reset_handler = storvsc_host_reset_handler, 1501 .proc_name = "storvsc_host", 1502 .eh_timed_out = storvsc_eh_timed_out, 1503 .slave_configure = storvsc_device_configure, 1504 .cmd_per_lun = 255, 1505 .this_id = -1, 1506 .use_clustering = ENABLE_CLUSTERING, 1507 /* Make sure we dont get a sg segment crosses a page boundary */ 1508 .dma_boundary = PAGE_SIZE-1, 1509 .no_write_same = 1, 1510 }; 1511 1512 enum { 1513 SCSI_GUID, 1514 IDE_GUID, 1515 SFC_GUID, 1516 }; 1517 1518 static const struct hv_vmbus_device_id id_table[] = { 1519 /* SCSI guid */ 1520 { HV_SCSI_GUID, 1521 .driver_data = SCSI_GUID 1522 }, 1523 /* IDE guid */ 1524 { HV_IDE_GUID, 1525 .driver_data = IDE_GUID 1526 }, 1527 /* Fibre Channel GUID */ 1528 { 1529 HV_SYNTHFC_GUID, 1530 .driver_data = SFC_GUID 1531 }, 1532 { }, 1533 }; 1534 1535 MODULE_DEVICE_TABLE(vmbus, id_table); 1536 1537 static int storvsc_probe(struct hv_device *device, 1538 const struct hv_vmbus_device_id *dev_id) 1539 { 1540 int ret; 1541 int num_cpus = num_online_cpus(); 1542 struct Scsi_Host *host; 1543 struct hv_host_device *host_dev; 1544 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1545 int target = 0; 1546 struct storvsc_device *stor_device; 1547 int max_luns_per_target; 1548 int max_targets; 1549 int max_channels; 1550 int max_sub_channels = 0; 1551 1552 /* 1553 * Based on the windows host we are running on, 1554 * set state to properly communicate with the host. 1555 */ 1556 1557 if (vmbus_proto_version < VERSION_WIN8) { 1558 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1559 max_targets = STORVSC_IDE_MAX_TARGETS; 1560 max_channels = STORVSC_IDE_MAX_CHANNELS; 1561 } else { 1562 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; 1563 max_targets = STORVSC_MAX_TARGETS; 1564 max_channels = STORVSC_MAX_CHANNELS; 1565 /* 1566 * On Windows8 and above, we support sub-channels for storage. 1567 * The number of sub-channels offerred is based on the number of 1568 * VCPUs in the guest. 1569 */ 1570 max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); 1571 } 1572 1573 scsi_driver.can_queue = (max_outstanding_req_per_channel * 1574 (max_sub_channels + 1)); 1575 1576 host = scsi_host_alloc(&scsi_driver, 1577 sizeof(struct hv_host_device)); 1578 if (!host) 1579 return -ENOMEM; 1580 1581 host_dev = shost_priv(host); 1582 memset(host_dev, 0, sizeof(struct hv_host_device)); 1583 1584 host_dev->port = host->host_no; 1585 host_dev->dev = device; 1586 1587 1588 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1589 if (!stor_device) { 1590 ret = -ENOMEM; 1591 goto err_out0; 1592 } 1593 1594 stor_device->destroy = false; 1595 stor_device->open_sub_channel = false; 1596 init_waitqueue_head(&stor_device->waiting_to_drain); 1597 stor_device->device = device; 1598 stor_device->host = host; 1599 hv_set_drvdata(device, stor_device); 1600 1601 stor_device->port_number = host->host_no; 1602 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); 1603 if (ret) 1604 goto err_out1; 1605 1606 host_dev->path = stor_device->path_id; 1607 host_dev->target = stor_device->target_id; 1608 1609 switch (dev_id->driver_data) { 1610 case SFC_GUID: 1611 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; 1612 host->max_id = STORVSC_FC_MAX_TARGETS; 1613 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; 1614 break; 1615 1616 case SCSI_GUID: 1617 host->max_lun = max_luns_per_target; 1618 host->max_id = max_targets; 1619 host->max_channel = max_channels - 1; 1620 break; 1621 1622 default: 1623 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1624 host->max_id = STORVSC_IDE_MAX_TARGETS; 1625 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; 1626 break; 1627 } 1628 /* max cmd length */ 1629 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1630 1631 /* 1632 * set the table size based on the info we got 1633 * from the host. 1634 */ 1635 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); 1636 1637 /* Register the HBA and start the scsi bus scan */ 1638 ret = scsi_add_host(host, &device->device); 1639 if (ret != 0) 1640 goto err_out2; 1641 1642 if (!dev_is_ide) { 1643 scsi_scan_host(host); 1644 } else { 1645 target = (device->dev_instance.b[5] << 8 | 1646 device->dev_instance.b[4]); 1647 ret = scsi_add_device(host, 0, target, 0); 1648 if (ret) { 1649 scsi_remove_host(host); 1650 goto err_out2; 1651 } 1652 } 1653 return 0; 1654 1655 err_out2: 1656 /* 1657 * Once we have connected with the host, we would need to 1658 * to invoke storvsc_dev_remove() to rollback this state and 1659 * this call also frees up the stor_device; hence the jump around 1660 * err_out1 label. 1661 */ 1662 storvsc_dev_remove(device); 1663 goto err_out0; 1664 1665 err_out1: 1666 kfree(stor_device); 1667 1668 err_out0: 1669 scsi_host_put(host); 1670 return ret; 1671 } 1672 1673 static int storvsc_remove(struct hv_device *dev) 1674 { 1675 struct storvsc_device *stor_device = hv_get_drvdata(dev); 1676 struct Scsi_Host *host = stor_device->host; 1677 1678 scsi_remove_host(host); 1679 storvsc_dev_remove(dev); 1680 scsi_host_put(host); 1681 1682 return 0; 1683 } 1684 1685 static struct hv_driver storvsc_drv = { 1686 .name = KBUILD_MODNAME, 1687 .id_table = id_table, 1688 .probe = storvsc_probe, 1689 .remove = storvsc_remove, 1690 }; 1691 1692 static int __init storvsc_drv_init(void) 1693 { 1694 1695 /* 1696 * Divide the ring buffer data size (which is 1 page less 1697 * than the ring buffer size since that page is reserved for 1698 * the ring buffer indices) by the max request size (which is 1699 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 1700 */ 1701 max_outstanding_req_per_channel = 1702 ((storvsc_ringbuffer_size - PAGE_SIZE) / 1703 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 1704 sizeof(struct vstor_packet) + sizeof(u64) - 1705 vmscsi_size_delta, 1706 sizeof(u64))); 1707 1708 return vmbus_driver_register(&storvsc_drv); 1709 } 1710 1711 static void __exit storvsc_drv_exit(void) 1712 { 1713 vmbus_driver_unregister(&storvsc_drv); 1714 } 1715 1716 MODULE_LICENSE("GPL"); 1717 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 1718 module_init(storvsc_drv_init); 1719 module_exit(storvsc_drv_exit); 1720