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 #include <scsi/scsi_transport_fc.h> 45 46 /* 47 * All wire protocol details (storage protocol between the guest and the host) 48 * are consolidated here. 49 * 50 * Begin protocol definitions. 51 */ 52 53 /* 54 * Version history: 55 * V1 Beta: 0.1 56 * V1 RC < 2008/1/31: 1.0 57 * V1 RC > 2008/1/31: 2.0 58 * Win7: 4.2 59 * Win8: 5.1 60 * Win8.1: 6.0 61 * Win10: 6.2 62 */ 63 64 #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ 65 (((MINOR_) & 0xff))) 66 67 #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) 68 #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) 69 #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) 70 #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) 71 #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) 72 73 /* Packet structure describing virtual storage requests. */ 74 enum vstor_packet_operation { 75 VSTOR_OPERATION_COMPLETE_IO = 1, 76 VSTOR_OPERATION_REMOVE_DEVICE = 2, 77 VSTOR_OPERATION_EXECUTE_SRB = 3, 78 VSTOR_OPERATION_RESET_LUN = 4, 79 VSTOR_OPERATION_RESET_ADAPTER = 5, 80 VSTOR_OPERATION_RESET_BUS = 6, 81 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, 82 VSTOR_OPERATION_END_INITIALIZATION = 8, 83 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, 84 VSTOR_OPERATION_QUERY_PROPERTIES = 10, 85 VSTOR_OPERATION_ENUMERATE_BUS = 11, 86 VSTOR_OPERATION_FCHBA_DATA = 12, 87 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, 88 VSTOR_OPERATION_MAXIMUM = 13 89 }; 90 91 /* 92 * WWN packet for Fibre Channel HBA 93 */ 94 95 struct hv_fc_wwn_packet { 96 u8 primary_active; 97 u8 reserved1[3]; 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 #define STORVSC_LOGGING_NONE 0 168 #define STORVSC_LOGGING_ERROR 1 169 #define STORVSC_LOGGING_WARN 2 170 171 static int logging_level = STORVSC_LOGGING_ERROR; 172 module_param(logging_level, int, S_IRUGO|S_IWUSR); 173 MODULE_PARM_DESC(logging_level, 174 "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); 175 176 static inline bool do_logging(int level) 177 { 178 return logging_level >= level; 179 } 180 181 #define storvsc_log(dev, level, fmt, ...) \ 182 do { \ 183 if (do_logging(level)) \ 184 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ 185 } while (0) 186 187 struct vmscsi_win8_extension { 188 /* 189 * The following were added in Windows 8 190 */ 191 u16 reserve; 192 u8 queue_tag; 193 u8 queue_action; 194 u32 srb_flags; 195 u32 time_out_value; 196 u32 queue_sort_ey; 197 } __packed; 198 199 struct vmscsi_request { 200 u16 length; 201 u8 srb_status; 202 u8 scsi_status; 203 204 u8 port_number; 205 u8 path_id; 206 u8 target_id; 207 u8 lun; 208 209 u8 cdb_length; 210 u8 sense_info_length; 211 u8 data_in; 212 u8 reserved; 213 214 u32 data_transfer_length; 215 216 union { 217 u8 cdb[STORVSC_MAX_CMD_LEN]; 218 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; 219 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; 220 }; 221 /* 222 * The following was added in win8. 223 */ 224 struct vmscsi_win8_extension win8_extension; 225 226 } __attribute((packed)); 227 228 229 /* 230 * The size of the vmscsi_request has changed in win8. The 231 * additional size is because of new elements added to the 232 * structure. These elements are valid only when we are talking 233 * to a win8 host. 234 * Track the correction to size we need to apply. This value 235 * will likely change during protocol negotiation but it is 236 * valid to start by assuming pre-Win8. 237 */ 238 static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 239 240 /* 241 * The list of storage protocols in order of preference. 242 */ 243 struct vmstor_protocol { 244 int protocol_version; 245 int sense_buffer_size; 246 int vmscsi_size_delta; 247 }; 248 249 250 static const struct vmstor_protocol vmstor_protocols[] = { 251 { 252 VMSTOR_PROTO_VERSION_WIN10, 253 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 254 0 255 }, 256 { 257 VMSTOR_PROTO_VERSION_WIN8_1, 258 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 259 0 260 }, 261 { 262 VMSTOR_PROTO_VERSION_WIN8, 263 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 264 0 265 }, 266 { 267 VMSTOR_PROTO_VERSION_WIN7, 268 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 269 sizeof(struct vmscsi_win8_extension), 270 }, 271 { 272 VMSTOR_PROTO_VERSION_WIN6, 273 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 274 sizeof(struct vmscsi_win8_extension), 275 } 276 }; 277 278 279 /* 280 * This structure is sent during the intialization phase to get the different 281 * properties of the channel. 282 */ 283 284 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 285 286 struct vmstorage_channel_properties { 287 u32 reserved; 288 u16 max_channel_cnt; 289 u16 reserved1; 290 291 u32 flags; 292 u32 max_transfer_bytes; 293 294 u64 reserved2; 295 } __packed; 296 297 /* This structure is sent during the storage protocol negotiations. */ 298 struct vmstorage_protocol_version { 299 /* Major (MSW) and minor (LSW) version numbers. */ 300 u16 major_minor; 301 302 /* 303 * Revision number is auto-incremented whenever this file is changed 304 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 305 * definitely indicate incompatibility--but it does indicate mismatched 306 * builds. 307 * This is only used on the windows side. Just set it to 0. 308 */ 309 u16 revision; 310 } __packed; 311 312 /* Channel Property Flags */ 313 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 314 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 315 316 struct vstor_packet { 317 /* Requested operation type */ 318 enum vstor_packet_operation operation; 319 320 /* Flags - see below for values */ 321 u32 flags; 322 323 /* Status of the request returned from the server side. */ 324 u32 status; 325 326 /* Data payload area */ 327 union { 328 /* 329 * Structure used to forward SCSI commands from the 330 * client to the server. 331 */ 332 struct vmscsi_request vm_srb; 333 334 /* Structure used to query channel properties. */ 335 struct vmstorage_channel_properties storage_channel_properties; 336 337 /* Used during version negotiations. */ 338 struct vmstorage_protocol_version version; 339 340 /* Fibre channel address packet */ 341 struct hv_fc_wwn_packet wwn_packet; 342 343 /* Number of sub-channels to create */ 344 u16 sub_channel_count; 345 346 /* This will be the maximum of the union members */ 347 u8 buffer[0x34]; 348 }; 349 } __packed; 350 351 /* 352 * Packet Flags: 353 * 354 * This flag indicates that the server should send back a completion for this 355 * packet. 356 */ 357 358 #define REQUEST_COMPLETION_FLAG 0x1 359 360 /* Matches Windows-end */ 361 enum storvsc_request_type { 362 WRITE_TYPE = 0, 363 READ_TYPE, 364 UNKNOWN_TYPE, 365 }; 366 367 /* 368 * SRB status codes and masks; a subset of the codes used here. 369 */ 370 371 #define SRB_STATUS_AUTOSENSE_VALID 0x80 372 #define SRB_STATUS_QUEUE_FROZEN 0x40 373 #define SRB_STATUS_INVALID_LUN 0x20 374 #define SRB_STATUS_SUCCESS 0x01 375 #define SRB_STATUS_ABORTED 0x02 376 #define SRB_STATUS_ERROR 0x04 377 378 #define SRB_STATUS(status) \ 379 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) 380 /* 381 * This is the end of Protocol specific defines. 382 */ 383 384 static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); 385 static u32 max_outstanding_req_per_channel; 386 387 static int storvsc_vcpus_per_sub_channel = 4; 388 389 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 390 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 391 392 module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); 393 MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); 394 /* 395 * Timeout in seconds for all devices managed by this driver. 396 */ 397 static int storvsc_timeout = 180; 398 399 static int msft_blist_flags = BLIST_TRY_VPD_PAGES; 400 401 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 402 static struct scsi_transport_template *fc_transport_template; 403 #endif 404 405 static void storvsc_on_channel_callback(void *context); 406 407 #define STORVSC_MAX_LUNS_PER_TARGET 255 408 #define STORVSC_MAX_TARGETS 2 409 #define STORVSC_MAX_CHANNELS 8 410 411 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 412 #define STORVSC_FC_MAX_TARGETS 128 413 #define STORVSC_FC_MAX_CHANNELS 8 414 415 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 416 #define STORVSC_IDE_MAX_TARGETS 1 417 #define STORVSC_IDE_MAX_CHANNELS 1 418 419 struct storvsc_cmd_request { 420 struct scsi_cmnd *cmd; 421 422 struct hv_device *device; 423 424 /* Synchronize the request/response if needed */ 425 struct completion wait_event; 426 427 struct vmbus_channel_packet_multipage_buffer mpb; 428 struct vmbus_packet_mpb_array *payload; 429 u32 payload_sz; 430 431 struct vstor_packet vstor_packet; 432 }; 433 434 435 /* A storvsc device is a device object that contains a vmbus channel */ 436 struct storvsc_device { 437 struct hv_device *device; 438 439 bool destroy; 440 bool drain_notify; 441 bool open_sub_channel; 442 atomic_t num_outstanding_req; 443 struct Scsi_Host *host; 444 445 wait_queue_head_t waiting_to_drain; 446 447 /* 448 * Each unique Port/Path/Target represents 1 channel ie scsi 449 * controller. In reality, the pathid, targetid is always 0 450 * and the port is set by us 451 */ 452 unsigned int port_number; 453 unsigned char path_id; 454 unsigned char target_id; 455 456 /* 457 * Max I/O, the device can support. 458 */ 459 u32 max_transfer_bytes; 460 /* Used for vsc/vsp channel reset process */ 461 struct storvsc_cmd_request init_request; 462 struct storvsc_cmd_request reset_request; 463 /* 464 * Currently active port and node names for FC devices. 465 */ 466 u64 node_name; 467 u64 port_name; 468 }; 469 470 struct hv_host_device { 471 struct hv_device *dev; 472 unsigned int port; 473 unsigned char path; 474 unsigned char target; 475 }; 476 477 struct storvsc_scan_work { 478 struct work_struct work; 479 struct Scsi_Host *host; 480 uint lun; 481 }; 482 483 static void storvsc_device_scan(struct work_struct *work) 484 { 485 struct storvsc_scan_work *wrk; 486 uint lun; 487 struct scsi_device *sdev; 488 489 wrk = container_of(work, struct storvsc_scan_work, work); 490 lun = wrk->lun; 491 492 sdev = scsi_device_lookup(wrk->host, 0, 0, lun); 493 if (!sdev) 494 goto done; 495 scsi_rescan_device(&sdev->sdev_gendev); 496 scsi_device_put(sdev); 497 498 done: 499 kfree(wrk); 500 } 501 502 static void storvsc_host_scan(struct work_struct *work) 503 { 504 struct storvsc_scan_work *wrk; 505 struct Scsi_Host *host; 506 struct scsi_device *sdev; 507 508 wrk = container_of(work, struct storvsc_scan_work, work); 509 host = wrk->host; 510 511 /* 512 * Before scanning the host, first check to see if any of the 513 * currrently known devices have been hot removed. We issue a 514 * "unit ready" command against all currently known devices. 515 * This I/O will result in an error for devices that have been 516 * removed. As part of handling the I/O error, we remove the device. 517 * 518 * When a LUN is added or removed, the host sends us a signal to 519 * scan the host. Thus we are forced to discover the LUNs that 520 * may have been removed this way. 521 */ 522 mutex_lock(&host->scan_mutex); 523 shost_for_each_device(sdev, host) 524 scsi_test_unit_ready(sdev, 1, 1, NULL); 525 mutex_unlock(&host->scan_mutex); 526 /* 527 * Now scan the host to discover LUNs that may have been added. 528 */ 529 scsi_scan_host(host); 530 531 kfree(wrk); 532 } 533 534 static void storvsc_remove_lun(struct work_struct *work) 535 { 536 struct storvsc_scan_work *wrk; 537 struct scsi_device *sdev; 538 539 wrk = container_of(work, struct storvsc_scan_work, work); 540 if (!scsi_host_get(wrk->host)) 541 goto done; 542 543 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); 544 545 if (sdev) { 546 scsi_remove_device(sdev); 547 scsi_device_put(sdev); 548 } 549 scsi_host_put(wrk->host); 550 551 done: 552 kfree(wrk); 553 } 554 555 556 /* 557 * We can get incoming messages from the host that are not in response to 558 * messages that we have sent out. An example of this would be messages 559 * received by the guest to notify dynamic addition/removal of LUNs. To 560 * deal with potential race conditions where the driver may be in the 561 * midst of being unloaded when we might receive an unsolicited message 562 * from the host, we have implemented a mechanism to gurantee sequential 563 * consistency: 564 * 565 * 1) Once the device is marked as being destroyed, we will fail all 566 * outgoing messages. 567 * 2) We permit incoming messages when the device is being destroyed, 568 * only to properly account for messages already sent out. 569 */ 570 571 static inline struct storvsc_device *get_out_stor_device( 572 struct hv_device *device) 573 { 574 struct storvsc_device *stor_device; 575 576 stor_device = hv_get_drvdata(device); 577 578 if (stor_device && stor_device->destroy) 579 stor_device = NULL; 580 581 return stor_device; 582 } 583 584 585 static inline void storvsc_wait_to_drain(struct storvsc_device *dev) 586 { 587 dev->drain_notify = true; 588 wait_event(dev->waiting_to_drain, 589 atomic_read(&dev->num_outstanding_req) == 0); 590 dev->drain_notify = false; 591 } 592 593 static inline struct storvsc_device *get_in_stor_device( 594 struct hv_device *device) 595 { 596 struct storvsc_device *stor_device; 597 598 stor_device = hv_get_drvdata(device); 599 600 if (!stor_device) 601 goto get_in_err; 602 603 /* 604 * If the device is being destroyed; allow incoming 605 * traffic only to cleanup outstanding requests. 606 */ 607 608 if (stor_device->destroy && 609 (atomic_read(&stor_device->num_outstanding_req) == 0)) 610 stor_device = NULL; 611 612 get_in_err: 613 return stor_device; 614 615 } 616 617 static void handle_sc_creation(struct vmbus_channel *new_sc) 618 { 619 struct hv_device *device = new_sc->primary_channel->device_obj; 620 struct storvsc_device *stor_device; 621 struct vmstorage_channel_properties props; 622 623 stor_device = get_out_stor_device(device); 624 if (!stor_device) 625 return; 626 627 if (stor_device->open_sub_channel == false) 628 return; 629 630 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 631 632 vmbus_open(new_sc, 633 storvsc_ringbuffer_size, 634 storvsc_ringbuffer_size, 635 (void *)&props, 636 sizeof(struct vmstorage_channel_properties), 637 storvsc_on_channel_callback, new_sc); 638 } 639 640 static void handle_multichannel_storage(struct hv_device *device, int max_chns) 641 { 642 struct storvsc_device *stor_device; 643 int num_cpus = num_online_cpus(); 644 int num_sc; 645 struct storvsc_cmd_request *request; 646 struct vstor_packet *vstor_packet; 647 int ret, t; 648 649 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); 650 stor_device = get_out_stor_device(device); 651 if (!stor_device) 652 return; 653 654 request = &stor_device->init_request; 655 vstor_packet = &request->vstor_packet; 656 657 stor_device->open_sub_channel = true; 658 /* 659 * Establish a handler for dealing with subchannels. 660 */ 661 vmbus_set_sc_create_callback(device->channel, handle_sc_creation); 662 663 /* 664 * Check to see if sub-channels have already been created. This 665 * can happen when this driver is re-loaded after unloading. 666 */ 667 668 if (vmbus_are_subchannels_present(device->channel)) 669 return; 670 671 stor_device->open_sub_channel = false; 672 /* 673 * Request the host to create sub-channels. 674 */ 675 memset(request, 0, sizeof(struct storvsc_cmd_request)); 676 init_completion(&request->wait_event); 677 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; 678 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 679 vstor_packet->sub_channel_count = num_sc; 680 681 ret = vmbus_sendpacket(device->channel, vstor_packet, 682 (sizeof(struct vstor_packet) - 683 vmscsi_size_delta), 684 (unsigned long)request, 685 VM_PKT_DATA_INBAND, 686 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 687 688 if (ret != 0) 689 return; 690 691 t = wait_for_completion_timeout(&request->wait_event, 10*HZ); 692 if (t == 0) 693 return; 694 695 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 696 vstor_packet->status != 0) 697 return; 698 699 /* 700 * Now that we created the sub-channels, invoke the check; this 701 * may trigger the callback. 702 */ 703 stor_device->open_sub_channel = true; 704 vmbus_are_subchannels_present(device->channel); 705 } 706 707 static void cache_wwn(struct storvsc_device *stor_device, 708 struct vstor_packet *vstor_packet) 709 { 710 /* 711 * Cache the currently active port and node ww names. 712 */ 713 if (vstor_packet->wwn_packet.primary_active) { 714 stor_device->node_name = 715 wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); 716 stor_device->port_name = 717 wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); 718 } else { 719 stor_device->node_name = 720 wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); 721 stor_device->port_name = 722 wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); 723 } 724 } 725 726 727 static int storvsc_execute_vstor_op(struct hv_device *device, 728 struct storvsc_cmd_request *request, 729 bool status_check) 730 { 731 struct vstor_packet *vstor_packet; 732 int ret, t; 733 734 vstor_packet = &request->vstor_packet; 735 736 init_completion(&request->wait_event); 737 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 738 739 ret = vmbus_sendpacket(device->channel, vstor_packet, 740 (sizeof(struct vstor_packet) - 741 vmscsi_size_delta), 742 (unsigned long)request, 743 VM_PKT_DATA_INBAND, 744 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 745 if (ret != 0) 746 return ret; 747 748 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 749 if (t == 0) 750 return -ETIMEDOUT; 751 752 if (!status_check) 753 return ret; 754 755 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 756 vstor_packet->status != 0) 757 return -EINVAL; 758 759 return ret; 760 } 761 762 static int storvsc_channel_init(struct hv_device *device, bool is_fc) 763 { 764 struct storvsc_device *stor_device; 765 struct storvsc_cmd_request *request; 766 struct vstor_packet *vstor_packet; 767 int ret, i; 768 int max_chns; 769 bool process_sub_channels = false; 770 771 stor_device = get_out_stor_device(device); 772 if (!stor_device) 773 return -ENODEV; 774 775 request = &stor_device->init_request; 776 vstor_packet = &request->vstor_packet; 777 778 /* 779 * Now, initiate the vsc/vsp initialization protocol on the open 780 * channel 781 */ 782 memset(request, 0, sizeof(struct storvsc_cmd_request)); 783 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 784 ret = storvsc_execute_vstor_op(device, request, true); 785 if (ret) 786 return ret; 787 /* 788 * Query host supported protocol version. 789 */ 790 791 for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { 792 /* reuse the packet for version range supported */ 793 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 794 vstor_packet->operation = 795 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 796 797 vstor_packet->version.major_minor = 798 vmstor_protocols[i].protocol_version; 799 800 /* 801 * The revision number is only used in Windows; set it to 0. 802 */ 803 vstor_packet->version.revision = 0; 804 ret = storvsc_execute_vstor_op(device, request, false); 805 if (ret != 0) 806 return ret; 807 808 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) 809 return -EINVAL; 810 811 if (vstor_packet->status == 0) { 812 vmstor_proto_version = 813 vmstor_protocols[i].protocol_version; 814 815 sense_buffer_size = 816 vmstor_protocols[i].sense_buffer_size; 817 818 vmscsi_size_delta = 819 vmstor_protocols[i].vmscsi_size_delta; 820 821 break; 822 } 823 } 824 825 if (vstor_packet->status != 0) 826 return -EINVAL; 827 828 829 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 830 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 831 ret = storvsc_execute_vstor_op(device, request, true); 832 if (ret != 0) 833 return ret; 834 835 /* 836 * Check to see if multi-channel support is there. 837 * Hosts that implement protocol version of 5.1 and above 838 * support multi-channel. 839 */ 840 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; 841 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { 842 if (vstor_packet->storage_channel_properties.flags & 843 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) 844 process_sub_channels = true; 845 } 846 stor_device->max_transfer_bytes = 847 vstor_packet->storage_channel_properties.max_transfer_bytes; 848 849 if (!is_fc) 850 goto done; 851 852 /* 853 * For FC devices retrieve FC HBA data. 854 */ 855 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 856 vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; 857 ret = storvsc_execute_vstor_op(device, request, true); 858 if (ret != 0) 859 return ret; 860 861 /* 862 * Cache the currently active port and node ww names. 863 */ 864 cache_wwn(stor_device, vstor_packet); 865 866 done: 867 868 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 869 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 870 ret = storvsc_execute_vstor_op(device, request, true); 871 if (ret != 0) 872 return ret; 873 874 if (process_sub_channels) 875 handle_multichannel_storage(device, max_chns); 876 877 return ret; 878 } 879 880 static void storvsc_handle_error(struct vmscsi_request *vm_srb, 881 struct scsi_cmnd *scmnd, 882 struct Scsi_Host *host, 883 u8 asc, u8 ascq) 884 { 885 struct storvsc_scan_work *wrk; 886 void (*process_err_fn)(struct work_struct *work); 887 bool do_work = false; 888 889 switch (SRB_STATUS(vm_srb->srb_status)) { 890 case SRB_STATUS_ERROR: 891 /* 892 * If there is an error; offline the device since all 893 * error recovery strategies would have already been 894 * deployed on the host side. However, if the command 895 * were a pass-through command deal with it appropriately. 896 */ 897 switch (scmnd->cmnd[0]) { 898 case ATA_16: 899 case ATA_12: 900 set_host_byte(scmnd, DID_PASSTHROUGH); 901 break; 902 /* 903 * On Some Windows hosts TEST_UNIT_READY command can return 904 * SRB_STATUS_ERROR, let the upper level code deal with it 905 * based on the sense information. 906 */ 907 case TEST_UNIT_READY: 908 break; 909 default: 910 set_host_byte(scmnd, DID_TARGET_FAILURE); 911 } 912 break; 913 case SRB_STATUS_INVALID_LUN: 914 do_work = true; 915 process_err_fn = storvsc_remove_lun; 916 break; 917 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): 918 if ((asc == 0x2a) && (ascq == 0x9)) { 919 do_work = true; 920 process_err_fn = storvsc_device_scan; 921 /* 922 * Retry the I/O that trigerred this. 923 */ 924 set_host_byte(scmnd, DID_REQUEUE); 925 } 926 break; 927 } 928 929 if (!do_work) 930 return; 931 932 /* 933 * We need to schedule work to process this error; schedule it. 934 */ 935 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 936 if (!wrk) { 937 set_host_byte(scmnd, DID_TARGET_FAILURE); 938 return; 939 } 940 941 wrk->host = host; 942 wrk->lun = vm_srb->lun; 943 INIT_WORK(&wrk->work, process_err_fn); 944 schedule_work(&wrk->work); 945 } 946 947 948 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, 949 struct storvsc_device *stor_dev) 950 { 951 struct scsi_cmnd *scmnd = cmd_request->cmd; 952 struct scsi_sense_hdr sense_hdr; 953 struct vmscsi_request *vm_srb; 954 struct Scsi_Host *host; 955 u32 payload_sz = cmd_request->payload_sz; 956 void *payload = cmd_request->payload; 957 958 host = stor_dev->host; 959 960 vm_srb = &cmd_request->vstor_packet.vm_srb; 961 962 scmnd->result = vm_srb->scsi_status; 963 964 if (scmnd->result) { 965 if (scsi_normalize_sense(scmnd->sense_buffer, 966 SCSI_SENSE_BUFFERSIZE, &sense_hdr) && 967 do_logging(STORVSC_LOGGING_ERROR)) 968 scsi_print_sense_hdr(scmnd->device, "storvsc", 969 &sense_hdr); 970 } 971 972 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) 973 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 974 sense_hdr.ascq); 975 976 scsi_set_resid(scmnd, 977 cmd_request->payload->range.len - 978 vm_srb->data_transfer_length); 979 980 scmnd->scsi_done(scmnd); 981 982 if (payload_sz > 983 sizeof(struct vmbus_channel_packet_multipage_buffer)) 984 kfree(payload); 985 } 986 987 static void storvsc_on_io_completion(struct storvsc_device *stor_device, 988 struct vstor_packet *vstor_packet, 989 struct storvsc_cmd_request *request) 990 { 991 struct vstor_packet *stor_pkt; 992 struct hv_device *device = stor_device->device; 993 994 stor_pkt = &request->vstor_packet; 995 996 /* 997 * The current SCSI handling on the host side does 998 * not correctly handle: 999 * INQUIRY command with page code parameter set to 0x80 1000 * MODE_SENSE command with cmd[2] == 0x1c 1001 * 1002 * Setup srb and scsi status so this won't be fatal. 1003 * We do this so we can distinguish truly fatal failues 1004 * (srb status == 0x4) and off-line the device in that case. 1005 */ 1006 1007 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 1008 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 1009 vstor_packet->vm_srb.scsi_status = 0; 1010 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 1011 } 1012 1013 1014 /* Copy over the status...etc */ 1015 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 1016 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 1017 stor_pkt->vm_srb.sense_info_length = 1018 vstor_packet->vm_srb.sense_info_length; 1019 1020 if (vstor_packet->vm_srb.scsi_status != 0 || 1021 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) 1022 storvsc_log(device, STORVSC_LOGGING_WARN, 1023 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 1024 stor_pkt->vm_srb.cdb[0], 1025 vstor_packet->vm_srb.scsi_status, 1026 vstor_packet->vm_srb.srb_status); 1027 1028 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1029 /* CHECK_CONDITION */ 1030 if (vstor_packet->vm_srb.srb_status & 1031 SRB_STATUS_AUTOSENSE_VALID) { 1032 /* autosense data available */ 1033 1034 storvsc_log(device, STORVSC_LOGGING_WARN, 1035 "stor pkt %p autosense data valid - len %d\n", 1036 request, vstor_packet->vm_srb.sense_info_length); 1037 1038 memcpy(request->cmd->sense_buffer, 1039 vstor_packet->vm_srb.sense_data, 1040 vstor_packet->vm_srb.sense_info_length); 1041 1042 } 1043 } 1044 1045 stor_pkt->vm_srb.data_transfer_length = 1046 vstor_packet->vm_srb.data_transfer_length; 1047 1048 storvsc_command_completion(request, stor_device); 1049 1050 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1051 stor_device->drain_notify) 1052 wake_up(&stor_device->waiting_to_drain); 1053 1054 1055 } 1056 1057 static void storvsc_on_receive(struct storvsc_device *stor_device, 1058 struct vstor_packet *vstor_packet, 1059 struct storvsc_cmd_request *request) 1060 { 1061 struct storvsc_scan_work *work; 1062 1063 switch (vstor_packet->operation) { 1064 case VSTOR_OPERATION_COMPLETE_IO: 1065 storvsc_on_io_completion(stor_device, vstor_packet, request); 1066 break; 1067 1068 case VSTOR_OPERATION_REMOVE_DEVICE: 1069 case VSTOR_OPERATION_ENUMERATE_BUS: 1070 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1071 if (!work) 1072 return; 1073 1074 INIT_WORK(&work->work, storvsc_host_scan); 1075 work->host = stor_device->host; 1076 schedule_work(&work->work); 1077 break; 1078 1079 case VSTOR_OPERATION_FCHBA_DATA: 1080 cache_wwn(stor_device, vstor_packet); 1081 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1082 fc_host_node_name(stor_device->host) = stor_device->node_name; 1083 fc_host_port_name(stor_device->host) = stor_device->port_name; 1084 #endif 1085 break; 1086 default: 1087 break; 1088 } 1089 } 1090 1091 static void storvsc_on_channel_callback(void *context) 1092 { 1093 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1094 struct hv_device *device; 1095 struct storvsc_device *stor_device; 1096 u32 bytes_recvd; 1097 u64 request_id; 1098 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; 1099 struct storvsc_cmd_request *request; 1100 int ret; 1101 1102 if (channel->primary_channel != NULL) 1103 device = channel->primary_channel->device_obj; 1104 else 1105 device = channel->device_obj; 1106 1107 stor_device = get_in_stor_device(device); 1108 if (!stor_device) 1109 return; 1110 1111 do { 1112 ret = vmbus_recvpacket(channel, packet, 1113 ALIGN((sizeof(struct vstor_packet) - 1114 vmscsi_size_delta), 8), 1115 &bytes_recvd, &request_id); 1116 if (ret == 0 && bytes_recvd > 0) { 1117 1118 request = (struct storvsc_cmd_request *) 1119 (unsigned long)request_id; 1120 1121 if ((request == &stor_device->init_request) || 1122 (request == &stor_device->reset_request)) { 1123 1124 memcpy(&request->vstor_packet, packet, 1125 (sizeof(struct vstor_packet) - 1126 vmscsi_size_delta)); 1127 complete(&request->wait_event); 1128 } else { 1129 storvsc_on_receive(stor_device, 1130 (struct vstor_packet *)packet, 1131 request); 1132 } 1133 } else { 1134 break; 1135 } 1136 } while (1); 1137 1138 return; 1139 } 1140 1141 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, 1142 bool is_fc) 1143 { 1144 struct vmstorage_channel_properties props; 1145 int ret; 1146 1147 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1148 1149 ret = vmbus_open(device->channel, 1150 ring_size, 1151 ring_size, 1152 (void *)&props, 1153 sizeof(struct vmstorage_channel_properties), 1154 storvsc_on_channel_callback, device->channel); 1155 1156 if (ret != 0) 1157 return ret; 1158 1159 ret = storvsc_channel_init(device, is_fc); 1160 1161 return ret; 1162 } 1163 1164 static int storvsc_dev_remove(struct hv_device *device) 1165 { 1166 struct storvsc_device *stor_device; 1167 unsigned long flags; 1168 1169 stor_device = hv_get_drvdata(device); 1170 1171 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1172 stor_device->destroy = true; 1173 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1174 1175 /* 1176 * At this point, all outbound traffic should be disable. We 1177 * only allow inbound traffic (responses) to proceed so that 1178 * outstanding requests can be completed. 1179 */ 1180 1181 storvsc_wait_to_drain(stor_device); 1182 1183 /* 1184 * Since we have already drained, we don't need to busy wait 1185 * as was done in final_release_stor_device() 1186 * Note that we cannot set the ext pointer to NULL until 1187 * we have drained - to drain the outgoing packets, we need to 1188 * allow incoming packets. 1189 */ 1190 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1191 hv_set_drvdata(device, NULL); 1192 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1193 1194 /* Close the channel */ 1195 vmbus_close(device->channel); 1196 1197 kfree(stor_device); 1198 return 0; 1199 } 1200 1201 static int storvsc_do_io(struct hv_device *device, 1202 struct storvsc_cmd_request *request) 1203 { 1204 struct storvsc_device *stor_device; 1205 struct vstor_packet *vstor_packet; 1206 struct vmbus_channel *outgoing_channel; 1207 int ret = 0; 1208 1209 vstor_packet = &request->vstor_packet; 1210 stor_device = get_out_stor_device(device); 1211 1212 if (!stor_device) 1213 return -ENODEV; 1214 1215 1216 request->device = device; 1217 /* 1218 * Select an an appropriate channel to send the request out. 1219 */ 1220 1221 outgoing_channel = vmbus_get_outgoing_channel(device->channel); 1222 1223 1224 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1225 1226 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1227 vmscsi_size_delta); 1228 1229 1230 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1231 1232 1233 vstor_packet->vm_srb.data_transfer_length = 1234 request->payload->range.len; 1235 1236 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1237 1238 if (request->payload->range.len) { 1239 1240 ret = vmbus_sendpacket_mpb_desc(outgoing_channel, 1241 request->payload, request->payload_sz, 1242 vstor_packet, 1243 (sizeof(struct vstor_packet) - 1244 vmscsi_size_delta), 1245 (unsigned long)request); 1246 } else { 1247 ret = vmbus_sendpacket(outgoing_channel, vstor_packet, 1248 (sizeof(struct vstor_packet) - 1249 vmscsi_size_delta), 1250 (unsigned long)request, 1251 VM_PKT_DATA_INBAND, 1252 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1253 } 1254 1255 if (ret != 0) 1256 return ret; 1257 1258 atomic_inc(&stor_device->num_outstanding_req); 1259 1260 return ret; 1261 } 1262 1263 static int storvsc_device_configure(struct scsi_device *sdevice) 1264 { 1265 1266 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); 1267 1268 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); 1269 1270 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1271 1272 /* Ensure there are no gaps in presented sgls */ 1273 blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1); 1274 1275 sdevice->no_write_same = 1; 1276 1277 /* 1278 * Add blist flags to permit the reading of the VPD pages even when 1279 * the target may claim SPC-2 compliance. MSFT targets currently 1280 * claim SPC-2 compliance while they implement post SPC-2 features. 1281 * With this patch we can correctly handle WRITE_SAME_16 issues. 1282 */ 1283 sdevice->sdev_bflags |= msft_blist_flags; 1284 1285 /* 1286 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 1287 * if the device is a MSFT virtual device. If the host is 1288 * WIN10 or newer, allow write_same. 1289 */ 1290 if (!strncmp(sdevice->vendor, "Msft", 4)) { 1291 switch (vmstor_proto_version) { 1292 case VMSTOR_PROTO_VERSION_WIN8: 1293 case VMSTOR_PROTO_VERSION_WIN8_1: 1294 sdevice->scsi_level = SCSI_SPC_3; 1295 break; 1296 } 1297 1298 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) 1299 sdevice->no_write_same = 0; 1300 } 1301 1302 return 0; 1303 } 1304 1305 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1306 sector_t capacity, int *info) 1307 { 1308 sector_t nsect = capacity; 1309 sector_t cylinders = nsect; 1310 int heads, sectors_pt; 1311 1312 /* 1313 * We are making up these values; let us keep it simple. 1314 */ 1315 heads = 0xff; 1316 sectors_pt = 0x3f; /* Sectors per track */ 1317 sector_div(cylinders, heads * sectors_pt); 1318 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1319 cylinders = 0xffff; 1320 1321 info[0] = heads; 1322 info[1] = sectors_pt; 1323 info[2] = (int)cylinders; 1324 1325 return 0; 1326 } 1327 1328 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1329 { 1330 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1331 struct hv_device *device = host_dev->dev; 1332 1333 struct storvsc_device *stor_device; 1334 struct storvsc_cmd_request *request; 1335 struct vstor_packet *vstor_packet; 1336 int ret, t; 1337 1338 1339 stor_device = get_out_stor_device(device); 1340 if (!stor_device) 1341 return FAILED; 1342 1343 request = &stor_device->reset_request; 1344 vstor_packet = &request->vstor_packet; 1345 1346 init_completion(&request->wait_event); 1347 1348 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1349 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1350 vstor_packet->vm_srb.path_id = stor_device->path_id; 1351 1352 ret = vmbus_sendpacket(device->channel, vstor_packet, 1353 (sizeof(struct vstor_packet) - 1354 vmscsi_size_delta), 1355 (unsigned long)&stor_device->reset_request, 1356 VM_PKT_DATA_INBAND, 1357 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1358 if (ret != 0) 1359 return FAILED; 1360 1361 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1362 if (t == 0) 1363 return TIMEOUT_ERROR; 1364 1365 1366 /* 1367 * At this point, all outstanding requests in the adapter 1368 * should have been flushed out and return to us 1369 * There is a potential race here where the host may be in 1370 * the process of responding when we return from here. 1371 * Just wait for all in-transit packets to be accounted for 1372 * before we return from here. 1373 */ 1374 storvsc_wait_to_drain(stor_device); 1375 1376 return SUCCESS; 1377 } 1378 1379 /* 1380 * The host guarantees to respond to each command, although I/O latencies might 1381 * be unbounded on Azure. Reset the timer unconditionally to give the host a 1382 * chance to perform EH. 1383 */ 1384 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) 1385 { 1386 return BLK_EH_RESET_TIMER; 1387 } 1388 1389 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1390 { 1391 bool allowed = true; 1392 u8 scsi_op = scmnd->cmnd[0]; 1393 1394 switch (scsi_op) { 1395 /* the host does not handle WRITE_SAME, log accident usage */ 1396 case WRITE_SAME: 1397 /* 1398 * smartd sends this command and the host does not handle 1399 * this. So, don't send it. 1400 */ 1401 case SET_WINDOW: 1402 scmnd->result = ILLEGAL_REQUEST << 16; 1403 allowed = false; 1404 break; 1405 default: 1406 break; 1407 } 1408 return allowed; 1409 } 1410 1411 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1412 { 1413 int ret; 1414 struct hv_host_device *host_dev = shost_priv(host); 1415 struct hv_device *dev = host_dev->dev; 1416 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); 1417 int i; 1418 struct scatterlist *sgl; 1419 unsigned int sg_count = 0; 1420 struct vmscsi_request *vm_srb; 1421 struct scatterlist *cur_sgl; 1422 struct vmbus_packet_mpb_array *payload; 1423 u32 payload_sz; 1424 u32 length; 1425 1426 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { 1427 /* 1428 * On legacy hosts filter unimplemented commands. 1429 * Future hosts are expected to correctly handle 1430 * unsupported commands. Furthermore, it is 1431 * possible that some of the currently 1432 * unsupported commands maybe supported in 1433 * future versions of the host. 1434 */ 1435 if (!storvsc_scsi_cmd_ok(scmnd)) { 1436 scmnd->scsi_done(scmnd); 1437 return 0; 1438 } 1439 } 1440 1441 /* Setup the cmd request */ 1442 cmd_request->cmd = scmnd; 1443 1444 vm_srb = &cmd_request->vstor_packet.vm_srb; 1445 vm_srb->win8_extension.time_out_value = 60; 1446 1447 vm_srb->win8_extension.srb_flags |= 1448 SRB_FLAGS_DISABLE_SYNCH_TRANSFER; 1449 1450 /* Build the SRB */ 1451 switch (scmnd->sc_data_direction) { 1452 case DMA_TO_DEVICE: 1453 vm_srb->data_in = WRITE_TYPE; 1454 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1455 break; 1456 case DMA_FROM_DEVICE: 1457 vm_srb->data_in = READ_TYPE; 1458 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1459 break; 1460 case DMA_NONE: 1461 vm_srb->data_in = UNKNOWN_TYPE; 1462 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; 1463 break; 1464 default: 1465 /* 1466 * This is DMA_BIDIRECTIONAL or something else we are never 1467 * supposed to see here. 1468 */ 1469 WARN(1, "Unexpected data direction: %d\n", 1470 scmnd->sc_data_direction); 1471 return -EINVAL; 1472 } 1473 1474 1475 vm_srb->port_number = host_dev->port; 1476 vm_srb->path_id = scmnd->device->channel; 1477 vm_srb->target_id = scmnd->device->id; 1478 vm_srb->lun = scmnd->device->lun; 1479 1480 vm_srb->cdb_length = scmnd->cmd_len; 1481 1482 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1483 1484 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1485 sg_count = scsi_sg_count(scmnd); 1486 1487 length = scsi_bufflen(scmnd); 1488 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; 1489 payload_sz = sizeof(cmd_request->mpb); 1490 1491 if (sg_count) { 1492 if (sg_count > MAX_PAGE_BUFFER_COUNT) { 1493 1494 payload_sz = (sg_count * sizeof(void *) + 1495 sizeof(struct vmbus_packet_mpb_array)); 1496 payload = kmalloc(payload_sz, GFP_ATOMIC); 1497 if (!payload) 1498 return SCSI_MLQUEUE_DEVICE_BUSY; 1499 } 1500 1501 payload->range.len = length; 1502 payload->range.offset = sgl[0].offset; 1503 1504 cur_sgl = sgl; 1505 for (i = 0; i < sg_count; i++) { 1506 payload->range.pfn_array[i] = 1507 page_to_pfn(sg_page((cur_sgl))); 1508 cur_sgl = sg_next(cur_sgl); 1509 } 1510 1511 } else if (scsi_sglist(scmnd)) { 1512 payload->range.len = length; 1513 payload->range.offset = 1514 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); 1515 payload->range.pfn_array[0] = 1516 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; 1517 } 1518 1519 cmd_request->payload = payload; 1520 cmd_request->payload_sz = payload_sz; 1521 1522 /* Invokes the vsc to start an IO */ 1523 ret = storvsc_do_io(dev, cmd_request); 1524 1525 if (ret == -EAGAIN) { 1526 /* no more space */ 1527 return SCSI_MLQUEUE_DEVICE_BUSY; 1528 } 1529 1530 return 0; 1531 } 1532 1533 static struct scsi_host_template scsi_driver = { 1534 .module = THIS_MODULE, 1535 .name = "storvsc_host_t", 1536 .cmd_size = sizeof(struct storvsc_cmd_request), 1537 .bios_param = storvsc_get_chs, 1538 .queuecommand = storvsc_queuecommand, 1539 .eh_host_reset_handler = storvsc_host_reset_handler, 1540 .proc_name = "storvsc_host", 1541 .eh_timed_out = storvsc_eh_timed_out, 1542 .slave_configure = storvsc_device_configure, 1543 .cmd_per_lun = 255, 1544 .this_id = -1, 1545 .use_clustering = ENABLE_CLUSTERING, 1546 /* Make sure we dont get a sg segment crosses a page boundary */ 1547 .dma_boundary = PAGE_SIZE-1, 1548 .no_write_same = 1, 1549 }; 1550 1551 enum { 1552 SCSI_GUID, 1553 IDE_GUID, 1554 SFC_GUID, 1555 }; 1556 1557 static const struct hv_vmbus_device_id id_table[] = { 1558 /* SCSI guid */ 1559 { HV_SCSI_GUID, 1560 .driver_data = SCSI_GUID 1561 }, 1562 /* IDE guid */ 1563 { HV_IDE_GUID, 1564 .driver_data = IDE_GUID 1565 }, 1566 /* Fibre Channel GUID */ 1567 { 1568 HV_SYNTHFC_GUID, 1569 .driver_data = SFC_GUID 1570 }, 1571 { }, 1572 }; 1573 1574 MODULE_DEVICE_TABLE(vmbus, id_table); 1575 1576 static int storvsc_probe(struct hv_device *device, 1577 const struct hv_vmbus_device_id *dev_id) 1578 { 1579 int ret; 1580 int num_cpus = num_online_cpus(); 1581 struct Scsi_Host *host; 1582 struct hv_host_device *host_dev; 1583 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1584 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); 1585 int target = 0; 1586 struct storvsc_device *stor_device; 1587 int max_luns_per_target; 1588 int max_targets; 1589 int max_channels; 1590 int max_sub_channels = 0; 1591 1592 /* 1593 * Based on the windows host we are running on, 1594 * set state to properly communicate with the host. 1595 */ 1596 1597 if (vmbus_proto_version < VERSION_WIN8) { 1598 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1599 max_targets = STORVSC_IDE_MAX_TARGETS; 1600 max_channels = STORVSC_IDE_MAX_CHANNELS; 1601 } else { 1602 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; 1603 max_targets = STORVSC_MAX_TARGETS; 1604 max_channels = STORVSC_MAX_CHANNELS; 1605 /* 1606 * On Windows8 and above, we support sub-channels for storage. 1607 * The number of sub-channels offerred is based on the number of 1608 * VCPUs in the guest. 1609 */ 1610 max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); 1611 } 1612 1613 scsi_driver.can_queue = (max_outstanding_req_per_channel * 1614 (max_sub_channels + 1)); 1615 1616 host = scsi_host_alloc(&scsi_driver, 1617 sizeof(struct hv_host_device)); 1618 if (!host) 1619 return -ENOMEM; 1620 1621 host_dev = shost_priv(host); 1622 memset(host_dev, 0, sizeof(struct hv_host_device)); 1623 1624 host_dev->port = host->host_no; 1625 host_dev->dev = device; 1626 1627 1628 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1629 if (!stor_device) { 1630 ret = -ENOMEM; 1631 goto err_out0; 1632 } 1633 1634 stor_device->destroy = false; 1635 stor_device->open_sub_channel = false; 1636 init_waitqueue_head(&stor_device->waiting_to_drain); 1637 stor_device->device = device; 1638 stor_device->host = host; 1639 hv_set_drvdata(device, stor_device); 1640 1641 stor_device->port_number = host->host_no; 1642 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); 1643 if (ret) 1644 goto err_out1; 1645 1646 host_dev->path = stor_device->path_id; 1647 host_dev->target = stor_device->target_id; 1648 1649 switch (dev_id->driver_data) { 1650 case SFC_GUID: 1651 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; 1652 host->max_id = STORVSC_FC_MAX_TARGETS; 1653 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; 1654 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1655 host->transportt = fc_transport_template; 1656 #endif 1657 break; 1658 1659 case SCSI_GUID: 1660 host->max_lun = max_luns_per_target; 1661 host->max_id = max_targets; 1662 host->max_channel = max_channels - 1; 1663 break; 1664 1665 default: 1666 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1667 host->max_id = STORVSC_IDE_MAX_TARGETS; 1668 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; 1669 break; 1670 } 1671 /* max cmd length */ 1672 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1673 1674 /* 1675 * set the table size based on the info we got 1676 * from the host. 1677 */ 1678 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); 1679 1680 /* Register the HBA and start the scsi bus scan */ 1681 ret = scsi_add_host(host, &device->device); 1682 if (ret != 0) 1683 goto err_out2; 1684 1685 if (!dev_is_ide) { 1686 scsi_scan_host(host); 1687 } else { 1688 target = (device->dev_instance.b[5] << 8 | 1689 device->dev_instance.b[4]); 1690 ret = scsi_add_device(host, 0, target, 0); 1691 if (ret) { 1692 scsi_remove_host(host); 1693 goto err_out2; 1694 } 1695 } 1696 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1697 if (host->transportt == fc_transport_template) { 1698 fc_host_node_name(host) = stor_device->node_name; 1699 fc_host_port_name(host) = stor_device->port_name; 1700 } 1701 #endif 1702 return 0; 1703 1704 err_out2: 1705 /* 1706 * Once we have connected with the host, we would need to 1707 * to invoke storvsc_dev_remove() to rollback this state and 1708 * this call also frees up the stor_device; hence the jump around 1709 * err_out1 label. 1710 */ 1711 storvsc_dev_remove(device); 1712 goto err_out0; 1713 1714 err_out1: 1715 kfree(stor_device); 1716 1717 err_out0: 1718 scsi_host_put(host); 1719 return ret; 1720 } 1721 1722 static int storvsc_remove(struct hv_device *dev) 1723 { 1724 struct storvsc_device *stor_device = hv_get_drvdata(dev); 1725 struct Scsi_Host *host = stor_device->host; 1726 1727 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1728 if (host->transportt == fc_transport_template) 1729 fc_remove_host(host); 1730 #endif 1731 scsi_remove_host(host); 1732 storvsc_dev_remove(dev); 1733 scsi_host_put(host); 1734 1735 return 0; 1736 } 1737 1738 static struct hv_driver storvsc_drv = { 1739 .name = KBUILD_MODNAME, 1740 .id_table = id_table, 1741 .probe = storvsc_probe, 1742 .remove = storvsc_remove, 1743 }; 1744 1745 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1746 static struct fc_function_template fc_transport_functions = { 1747 .show_host_node_name = 1, 1748 .show_host_port_name = 1, 1749 }; 1750 #endif 1751 1752 static int __init storvsc_drv_init(void) 1753 { 1754 int ret; 1755 1756 /* 1757 * Divide the ring buffer data size (which is 1 page less 1758 * than the ring buffer size since that page is reserved for 1759 * the ring buffer indices) by the max request size (which is 1760 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 1761 */ 1762 max_outstanding_req_per_channel = 1763 ((storvsc_ringbuffer_size - PAGE_SIZE) / 1764 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 1765 sizeof(struct vstor_packet) + sizeof(u64) - 1766 vmscsi_size_delta, 1767 sizeof(u64))); 1768 1769 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1770 fc_transport_template = fc_attach_transport(&fc_transport_functions); 1771 if (!fc_transport_template) 1772 return -ENODEV; 1773 #endif 1774 1775 ret = vmbus_driver_register(&storvsc_drv); 1776 1777 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1778 if (ret) 1779 fc_release_transport(fc_transport_template); 1780 #endif 1781 1782 return ret; 1783 } 1784 1785 static void __exit storvsc_drv_exit(void) 1786 { 1787 vmbus_driver_unregister(&storvsc_drv); 1788 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1789 fc_release_transport(fc_transport_template); 1790 #endif 1791 } 1792 1793 MODULE_LICENSE("GPL"); 1794 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 1795 module_init(storvsc_drv_init); 1796 module_exit(storvsc_drv_exit); 1797