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 #include <scsi/scsi_transport.h> 46 47 /* 48 * All wire protocol details (storage protocol between the guest and the host) 49 * are consolidated here. 50 * 51 * Begin protocol definitions. 52 */ 53 54 /* 55 * Version history: 56 * V1 Beta: 0.1 57 * V1 RC < 2008/1/31: 1.0 58 * V1 RC > 2008/1/31: 2.0 59 * Win7: 4.2 60 * Win8: 5.1 61 * Win8.1: 6.0 62 * Win10: 6.2 63 */ 64 65 #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ 66 (((MINOR_) & 0xff))) 67 68 #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) 69 #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) 70 #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) 71 #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) 72 #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) 73 74 /* Packet structure describing virtual storage requests. */ 75 enum vstor_packet_operation { 76 VSTOR_OPERATION_COMPLETE_IO = 1, 77 VSTOR_OPERATION_REMOVE_DEVICE = 2, 78 VSTOR_OPERATION_EXECUTE_SRB = 3, 79 VSTOR_OPERATION_RESET_LUN = 4, 80 VSTOR_OPERATION_RESET_ADAPTER = 5, 81 VSTOR_OPERATION_RESET_BUS = 6, 82 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, 83 VSTOR_OPERATION_END_INITIALIZATION = 8, 84 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, 85 VSTOR_OPERATION_QUERY_PROPERTIES = 10, 86 VSTOR_OPERATION_ENUMERATE_BUS = 11, 87 VSTOR_OPERATION_FCHBA_DATA = 12, 88 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, 89 VSTOR_OPERATION_MAXIMUM = 13 90 }; 91 92 /* 93 * WWN packet for Fibre Channel HBA 94 */ 95 96 struct hv_fc_wwn_packet { 97 u8 primary_active; 98 u8 reserved1[3]; 99 u8 primary_port_wwn[8]; 100 u8 primary_node_wwn[8]; 101 u8 secondary_port_wwn[8]; 102 u8 secondary_node_wwn[8]; 103 }; 104 105 106 107 /* 108 * SRB Flag Bits 109 */ 110 111 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 112 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 113 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 114 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 115 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 116 #define SRB_FLAGS_DATA_IN 0x00000040 117 #define SRB_FLAGS_DATA_OUT 0x00000080 118 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 119 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) 120 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 121 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 122 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 123 124 /* 125 * This flag indicates the request is part of the workflow for processing a D3. 126 */ 127 #define SRB_FLAGS_D3_PROCESSING 0x00000800 128 #define SRB_FLAGS_IS_ACTIVE 0x00010000 129 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 130 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 131 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 132 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 133 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 134 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 135 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 136 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 137 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 138 139 140 /* 141 * Platform neutral description of a scsi request - 142 * this remains the same across the write regardless of 32/64 bit 143 * note: it's patterned off the SCSI_PASS_THROUGH structure 144 */ 145 #define STORVSC_MAX_CMD_LEN 0x10 146 147 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 148 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 149 150 #define STORVSC_SENSE_BUFFER_SIZE 0x14 151 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 152 153 /* 154 * Sense buffer size changed in win8; have a run-time 155 * variable to track the size we should use. This value will 156 * likely change during protocol negotiation but it is valid 157 * to start by assuming pre-Win8. 158 */ 159 static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; 160 161 /* 162 * The storage protocol version is determined during the 163 * initial exchange with the host. It will indicate which 164 * storage functionality is available in the host. 165 */ 166 static int vmstor_proto_version; 167 168 #define STORVSC_LOGGING_NONE 0 169 #define STORVSC_LOGGING_ERROR 1 170 #define STORVSC_LOGGING_WARN 2 171 172 static int logging_level = STORVSC_LOGGING_ERROR; 173 module_param(logging_level, int, S_IRUGO|S_IWUSR); 174 MODULE_PARM_DESC(logging_level, 175 "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); 176 177 static inline bool do_logging(int level) 178 { 179 return logging_level >= level; 180 } 181 182 #define storvsc_log(dev, level, fmt, ...) \ 183 do { \ 184 if (do_logging(level)) \ 185 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ 186 } while (0) 187 188 struct vmscsi_win8_extension { 189 /* 190 * The following were added in Windows 8 191 */ 192 u16 reserve; 193 u8 queue_tag; 194 u8 queue_action; 195 u32 srb_flags; 196 u32 time_out_value; 197 u32 queue_sort_ey; 198 } __packed; 199 200 struct vmscsi_request { 201 u16 length; 202 u8 srb_status; 203 u8 scsi_status; 204 205 u8 port_number; 206 u8 path_id; 207 u8 target_id; 208 u8 lun; 209 210 u8 cdb_length; 211 u8 sense_info_length; 212 u8 data_in; 213 u8 reserved; 214 215 u32 data_transfer_length; 216 217 union { 218 u8 cdb[STORVSC_MAX_CMD_LEN]; 219 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; 220 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; 221 }; 222 /* 223 * The following was added in win8. 224 */ 225 struct vmscsi_win8_extension win8_extension; 226 227 } __attribute((packed)); 228 229 230 /* 231 * The size of the vmscsi_request has changed in win8. The 232 * additional size is because of new elements added to the 233 * structure. These elements are valid only when we are talking 234 * to a win8 host. 235 * Track the correction to size we need to apply. This value 236 * will likely change during protocol negotiation but it is 237 * valid to start by assuming pre-Win8. 238 */ 239 static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 240 241 /* 242 * The list of storage protocols in order of preference. 243 */ 244 struct vmstor_protocol { 245 int protocol_version; 246 int sense_buffer_size; 247 int vmscsi_size_delta; 248 }; 249 250 251 static const struct vmstor_protocol vmstor_protocols[] = { 252 { 253 VMSTOR_PROTO_VERSION_WIN10, 254 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 255 0 256 }, 257 { 258 VMSTOR_PROTO_VERSION_WIN8_1, 259 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 260 0 261 }, 262 { 263 VMSTOR_PROTO_VERSION_WIN8, 264 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 265 0 266 }, 267 { 268 VMSTOR_PROTO_VERSION_WIN7, 269 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 270 sizeof(struct vmscsi_win8_extension), 271 }, 272 { 273 VMSTOR_PROTO_VERSION_WIN6, 274 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 275 sizeof(struct vmscsi_win8_extension), 276 } 277 }; 278 279 280 /* 281 * This structure is sent during the intialization phase to get the different 282 * properties of the channel. 283 */ 284 285 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 286 287 struct vmstorage_channel_properties { 288 u32 reserved; 289 u16 max_channel_cnt; 290 u16 reserved1; 291 292 u32 flags; 293 u32 max_transfer_bytes; 294 295 u64 reserved2; 296 } __packed; 297 298 /* This structure is sent during the storage protocol negotiations. */ 299 struct vmstorage_protocol_version { 300 /* Major (MSW) and minor (LSW) version numbers. */ 301 u16 major_minor; 302 303 /* 304 * Revision number is auto-incremented whenever this file is changed 305 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 306 * definitely indicate incompatibility--but it does indicate mismatched 307 * builds. 308 * This is only used on the windows side. Just set it to 0. 309 */ 310 u16 revision; 311 } __packed; 312 313 /* Channel Property Flags */ 314 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 315 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 316 317 struct vstor_packet { 318 /* Requested operation type */ 319 enum vstor_packet_operation operation; 320 321 /* Flags - see below for values */ 322 u32 flags; 323 324 /* Status of the request returned from the server side. */ 325 u32 status; 326 327 /* Data payload area */ 328 union { 329 /* 330 * Structure used to forward SCSI commands from the 331 * client to the server. 332 */ 333 struct vmscsi_request vm_srb; 334 335 /* Structure used to query channel properties. */ 336 struct vmstorage_channel_properties storage_channel_properties; 337 338 /* Used during version negotiations. */ 339 struct vmstorage_protocol_version version; 340 341 /* Fibre channel address packet */ 342 struct hv_fc_wwn_packet wwn_packet; 343 344 /* Number of sub-channels to create */ 345 u16 sub_channel_count; 346 347 /* This will be the maximum of the union members */ 348 u8 buffer[0x34]; 349 }; 350 } __packed; 351 352 /* 353 * Packet Flags: 354 * 355 * This flag indicates that the server should send back a completion for this 356 * packet. 357 */ 358 359 #define REQUEST_COMPLETION_FLAG 0x1 360 361 /* Matches Windows-end */ 362 enum storvsc_request_type { 363 WRITE_TYPE = 0, 364 READ_TYPE, 365 UNKNOWN_TYPE, 366 }; 367 368 /* 369 * SRB status codes and masks; a subset of the codes used here. 370 */ 371 372 #define SRB_STATUS_AUTOSENSE_VALID 0x80 373 #define SRB_STATUS_QUEUE_FROZEN 0x40 374 #define SRB_STATUS_INVALID_LUN 0x20 375 #define SRB_STATUS_SUCCESS 0x01 376 #define SRB_STATUS_ABORTED 0x02 377 #define SRB_STATUS_ERROR 0x04 378 379 #define SRB_STATUS(status) \ 380 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) 381 /* 382 * This is the end of Protocol specific defines. 383 */ 384 385 static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); 386 static u32 max_outstanding_req_per_channel; 387 388 static int storvsc_vcpus_per_sub_channel = 4; 389 390 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 391 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 392 393 module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); 394 MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); 395 /* 396 * Timeout in seconds for all devices managed by this driver. 397 */ 398 static int storvsc_timeout = 180; 399 400 static int msft_blist_flags = BLIST_TRY_VPD_PAGES; 401 402 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 403 static struct scsi_transport_template *fc_transport_template; 404 #endif 405 406 static void storvsc_on_channel_callback(void *context); 407 408 #define STORVSC_MAX_LUNS_PER_TARGET 255 409 #define STORVSC_MAX_TARGETS 2 410 #define STORVSC_MAX_CHANNELS 8 411 412 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 413 #define STORVSC_FC_MAX_TARGETS 128 414 #define STORVSC_FC_MAX_CHANNELS 8 415 416 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 417 #define STORVSC_IDE_MAX_TARGETS 1 418 #define STORVSC_IDE_MAX_CHANNELS 1 419 420 struct storvsc_cmd_request { 421 struct scsi_cmnd *cmd; 422 423 struct hv_device *device; 424 425 /* Synchronize the request/response if needed */ 426 struct completion wait_event; 427 428 struct vmbus_channel_packet_multipage_buffer mpb; 429 struct vmbus_packet_mpb_array *payload; 430 u32 payload_sz; 431 432 struct vstor_packet vstor_packet; 433 }; 434 435 436 /* A storvsc device is a device object that contains a vmbus channel */ 437 struct storvsc_device { 438 struct hv_device *device; 439 440 bool destroy; 441 bool drain_notify; 442 bool open_sub_channel; 443 atomic_t num_outstanding_req; 444 struct Scsi_Host *host; 445 446 wait_queue_head_t waiting_to_drain; 447 448 /* 449 * Each unique Port/Path/Target represents 1 channel ie scsi 450 * controller. In reality, the pathid, targetid is always 0 451 * and the port is set by us 452 */ 453 unsigned int port_number; 454 unsigned char path_id; 455 unsigned char target_id; 456 457 /* 458 * Max I/O, the device can support. 459 */ 460 u32 max_transfer_bytes; 461 /* Used for vsc/vsp channel reset process */ 462 struct storvsc_cmd_request init_request; 463 struct storvsc_cmd_request reset_request; 464 /* 465 * Currently active port and node names for FC devices. 466 */ 467 u64 node_name; 468 u64 port_name; 469 }; 470 471 struct hv_host_device { 472 struct hv_device *dev; 473 unsigned int port; 474 unsigned char path; 475 unsigned char target; 476 }; 477 478 struct storvsc_scan_work { 479 struct work_struct work; 480 struct Scsi_Host *host; 481 u8 lun; 482 u8 tgt_id; 483 }; 484 485 static void storvsc_device_scan(struct work_struct *work) 486 { 487 struct storvsc_scan_work *wrk; 488 struct scsi_device *sdev; 489 490 wrk = container_of(work, struct storvsc_scan_work, work); 491 492 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->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, wrk->tgt_id, 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: 918 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && 919 (asc == 0x2a) && (ascq == 0x9)) { 920 do_work = true; 921 process_err_fn = storvsc_device_scan; 922 /* 923 * Retry the I/O that trigerred this. 924 */ 925 set_host_byte(scmnd, DID_REQUEUE); 926 } 927 break; 928 } 929 930 if (!do_work) 931 return; 932 933 /* 934 * We need to schedule work to process this error; schedule it. 935 */ 936 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 937 if (!wrk) { 938 set_host_byte(scmnd, DID_TARGET_FAILURE); 939 return; 940 } 941 942 wrk->host = host; 943 wrk->lun = vm_srb->lun; 944 wrk->tgt_id = vm_srb->target_id; 945 INIT_WORK(&wrk->work, process_err_fn); 946 schedule_work(&wrk->work); 947 } 948 949 950 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, 951 struct storvsc_device *stor_dev) 952 { 953 struct scsi_cmnd *scmnd = cmd_request->cmd; 954 struct scsi_sense_hdr sense_hdr; 955 struct vmscsi_request *vm_srb; 956 struct Scsi_Host *host; 957 u32 payload_sz = cmd_request->payload_sz; 958 void *payload = cmd_request->payload; 959 960 host = stor_dev->host; 961 962 vm_srb = &cmd_request->vstor_packet.vm_srb; 963 964 scmnd->result = vm_srb->scsi_status; 965 966 if (scmnd->result) { 967 if (scsi_normalize_sense(scmnd->sense_buffer, 968 SCSI_SENSE_BUFFERSIZE, &sense_hdr) && 969 !(sense_hdr.sense_key == NOT_READY && 970 sense_hdr.asc == 0x03A) && 971 do_logging(STORVSC_LOGGING_ERROR)) 972 scsi_print_sense_hdr(scmnd->device, "storvsc", 973 &sense_hdr); 974 } 975 976 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) 977 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 978 sense_hdr.ascq); 979 980 scsi_set_resid(scmnd, 981 cmd_request->payload->range.len - 982 vm_srb->data_transfer_length); 983 984 scmnd->scsi_done(scmnd); 985 986 if (payload_sz > 987 sizeof(struct vmbus_channel_packet_multipage_buffer)) 988 kfree(payload); 989 } 990 991 static void storvsc_on_io_completion(struct storvsc_device *stor_device, 992 struct vstor_packet *vstor_packet, 993 struct storvsc_cmd_request *request) 994 { 995 struct vstor_packet *stor_pkt; 996 struct hv_device *device = stor_device->device; 997 998 stor_pkt = &request->vstor_packet; 999 1000 /* 1001 * The current SCSI handling on the host side does 1002 * not correctly handle: 1003 * INQUIRY command with page code parameter set to 0x80 1004 * MODE_SENSE command with cmd[2] == 0x1c 1005 * 1006 * Setup srb and scsi status so this won't be fatal. 1007 * We do this so we can distinguish truly fatal failues 1008 * (srb status == 0x4) and off-line the device in that case. 1009 */ 1010 1011 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 1012 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 1013 vstor_packet->vm_srb.scsi_status = 0; 1014 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 1015 } 1016 1017 1018 /* Copy over the status...etc */ 1019 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 1020 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 1021 stor_pkt->vm_srb.sense_info_length = 1022 vstor_packet->vm_srb.sense_info_length; 1023 1024 if (vstor_packet->vm_srb.scsi_status != 0 || 1025 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) 1026 storvsc_log(device, STORVSC_LOGGING_WARN, 1027 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 1028 stor_pkt->vm_srb.cdb[0], 1029 vstor_packet->vm_srb.scsi_status, 1030 vstor_packet->vm_srb.srb_status); 1031 1032 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1033 /* CHECK_CONDITION */ 1034 if (vstor_packet->vm_srb.srb_status & 1035 SRB_STATUS_AUTOSENSE_VALID) { 1036 /* autosense data available */ 1037 1038 storvsc_log(device, STORVSC_LOGGING_WARN, 1039 "stor pkt %p autosense data valid - len %d\n", 1040 request, vstor_packet->vm_srb.sense_info_length); 1041 1042 memcpy(request->cmd->sense_buffer, 1043 vstor_packet->vm_srb.sense_data, 1044 vstor_packet->vm_srb.sense_info_length); 1045 1046 } 1047 } 1048 1049 stor_pkt->vm_srb.data_transfer_length = 1050 vstor_packet->vm_srb.data_transfer_length; 1051 1052 storvsc_command_completion(request, stor_device); 1053 1054 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1055 stor_device->drain_notify) 1056 wake_up(&stor_device->waiting_to_drain); 1057 1058 1059 } 1060 1061 static void storvsc_on_receive(struct storvsc_device *stor_device, 1062 struct vstor_packet *vstor_packet, 1063 struct storvsc_cmd_request *request) 1064 { 1065 struct storvsc_scan_work *work; 1066 1067 switch (vstor_packet->operation) { 1068 case VSTOR_OPERATION_COMPLETE_IO: 1069 storvsc_on_io_completion(stor_device, vstor_packet, request); 1070 break; 1071 1072 case VSTOR_OPERATION_REMOVE_DEVICE: 1073 case VSTOR_OPERATION_ENUMERATE_BUS: 1074 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1075 if (!work) 1076 return; 1077 1078 INIT_WORK(&work->work, storvsc_host_scan); 1079 work->host = stor_device->host; 1080 schedule_work(&work->work); 1081 break; 1082 1083 case VSTOR_OPERATION_FCHBA_DATA: 1084 cache_wwn(stor_device, vstor_packet); 1085 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1086 fc_host_node_name(stor_device->host) = stor_device->node_name; 1087 fc_host_port_name(stor_device->host) = stor_device->port_name; 1088 #endif 1089 break; 1090 default: 1091 break; 1092 } 1093 } 1094 1095 static void storvsc_on_channel_callback(void *context) 1096 { 1097 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1098 struct hv_device *device; 1099 struct storvsc_device *stor_device; 1100 u32 bytes_recvd; 1101 u64 request_id; 1102 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; 1103 struct storvsc_cmd_request *request; 1104 int ret; 1105 1106 if (channel->primary_channel != NULL) 1107 device = channel->primary_channel->device_obj; 1108 else 1109 device = channel->device_obj; 1110 1111 stor_device = get_in_stor_device(device); 1112 if (!stor_device) 1113 return; 1114 1115 do { 1116 ret = vmbus_recvpacket(channel, packet, 1117 ALIGN((sizeof(struct vstor_packet) - 1118 vmscsi_size_delta), 8), 1119 &bytes_recvd, &request_id); 1120 if (ret == 0 && bytes_recvd > 0) { 1121 1122 request = (struct storvsc_cmd_request *) 1123 (unsigned long)request_id; 1124 1125 if ((request == &stor_device->init_request) || 1126 (request == &stor_device->reset_request)) { 1127 1128 memcpy(&request->vstor_packet, packet, 1129 (sizeof(struct vstor_packet) - 1130 vmscsi_size_delta)); 1131 complete(&request->wait_event); 1132 } else { 1133 storvsc_on_receive(stor_device, 1134 (struct vstor_packet *)packet, 1135 request); 1136 } 1137 } else { 1138 break; 1139 } 1140 } while (1); 1141 1142 return; 1143 } 1144 1145 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, 1146 bool is_fc) 1147 { 1148 struct vmstorage_channel_properties props; 1149 int ret; 1150 1151 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1152 1153 ret = vmbus_open(device->channel, 1154 ring_size, 1155 ring_size, 1156 (void *)&props, 1157 sizeof(struct vmstorage_channel_properties), 1158 storvsc_on_channel_callback, device->channel); 1159 1160 if (ret != 0) 1161 return ret; 1162 1163 ret = storvsc_channel_init(device, is_fc); 1164 1165 return ret; 1166 } 1167 1168 static int storvsc_dev_remove(struct hv_device *device) 1169 { 1170 struct storvsc_device *stor_device; 1171 unsigned long flags; 1172 1173 stor_device = hv_get_drvdata(device); 1174 1175 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1176 stor_device->destroy = true; 1177 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1178 1179 /* 1180 * At this point, all outbound traffic should be disable. We 1181 * only allow inbound traffic (responses) to proceed so that 1182 * outstanding requests can be completed. 1183 */ 1184 1185 storvsc_wait_to_drain(stor_device); 1186 1187 /* 1188 * Since we have already drained, we don't need to busy wait 1189 * as was done in final_release_stor_device() 1190 * Note that we cannot set the ext pointer to NULL until 1191 * we have drained - to drain the outgoing packets, we need to 1192 * allow incoming packets. 1193 */ 1194 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1195 hv_set_drvdata(device, NULL); 1196 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1197 1198 /* Close the channel */ 1199 vmbus_close(device->channel); 1200 1201 kfree(stor_device); 1202 return 0; 1203 } 1204 1205 static int storvsc_do_io(struct hv_device *device, 1206 struct storvsc_cmd_request *request) 1207 { 1208 struct storvsc_device *stor_device; 1209 struct vstor_packet *vstor_packet; 1210 struct vmbus_channel *outgoing_channel; 1211 int ret = 0; 1212 1213 vstor_packet = &request->vstor_packet; 1214 stor_device = get_out_stor_device(device); 1215 1216 if (!stor_device) 1217 return -ENODEV; 1218 1219 1220 request->device = device; 1221 /* 1222 * Select an an appropriate channel to send the request out. 1223 */ 1224 1225 outgoing_channel = vmbus_get_outgoing_channel(device->channel); 1226 1227 1228 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1229 1230 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1231 vmscsi_size_delta); 1232 1233 1234 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1235 1236 1237 vstor_packet->vm_srb.data_transfer_length = 1238 request->payload->range.len; 1239 1240 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1241 1242 if (request->payload->range.len) { 1243 1244 ret = vmbus_sendpacket_mpb_desc(outgoing_channel, 1245 request->payload, request->payload_sz, 1246 vstor_packet, 1247 (sizeof(struct vstor_packet) - 1248 vmscsi_size_delta), 1249 (unsigned long)request); 1250 } else { 1251 ret = vmbus_sendpacket(outgoing_channel, vstor_packet, 1252 (sizeof(struct vstor_packet) - 1253 vmscsi_size_delta), 1254 (unsigned long)request, 1255 VM_PKT_DATA_INBAND, 1256 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1257 } 1258 1259 if (ret != 0) 1260 return ret; 1261 1262 atomic_inc(&stor_device->num_outstanding_req); 1263 1264 return ret; 1265 } 1266 1267 static int storvsc_device_configure(struct scsi_device *sdevice) 1268 { 1269 1270 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); 1271 1272 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); 1273 1274 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1275 1276 /* Ensure there are no gaps in presented sgls */ 1277 blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1); 1278 1279 sdevice->no_write_same = 1; 1280 1281 /* 1282 * Add blist flags to permit the reading of the VPD pages even when 1283 * the target may claim SPC-2 compliance. MSFT targets currently 1284 * claim SPC-2 compliance while they implement post SPC-2 features. 1285 * With this patch we can correctly handle WRITE_SAME_16 issues. 1286 */ 1287 sdevice->sdev_bflags |= msft_blist_flags; 1288 1289 /* 1290 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 1291 * if the device is a MSFT virtual device. If the host is 1292 * WIN10 or newer, allow write_same. 1293 */ 1294 if (!strncmp(sdevice->vendor, "Msft", 4)) { 1295 switch (vmstor_proto_version) { 1296 case VMSTOR_PROTO_VERSION_WIN8: 1297 case VMSTOR_PROTO_VERSION_WIN8_1: 1298 sdevice->scsi_level = SCSI_SPC_3; 1299 break; 1300 } 1301 1302 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) 1303 sdevice->no_write_same = 0; 1304 } 1305 1306 return 0; 1307 } 1308 1309 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1310 sector_t capacity, int *info) 1311 { 1312 sector_t nsect = capacity; 1313 sector_t cylinders = nsect; 1314 int heads, sectors_pt; 1315 1316 /* 1317 * We are making up these values; let us keep it simple. 1318 */ 1319 heads = 0xff; 1320 sectors_pt = 0x3f; /* Sectors per track */ 1321 sector_div(cylinders, heads * sectors_pt); 1322 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1323 cylinders = 0xffff; 1324 1325 info[0] = heads; 1326 info[1] = sectors_pt; 1327 info[2] = (int)cylinders; 1328 1329 return 0; 1330 } 1331 1332 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1333 { 1334 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1335 struct hv_device *device = host_dev->dev; 1336 1337 struct storvsc_device *stor_device; 1338 struct storvsc_cmd_request *request; 1339 struct vstor_packet *vstor_packet; 1340 int ret, t; 1341 1342 1343 stor_device = get_out_stor_device(device); 1344 if (!stor_device) 1345 return FAILED; 1346 1347 request = &stor_device->reset_request; 1348 vstor_packet = &request->vstor_packet; 1349 1350 init_completion(&request->wait_event); 1351 1352 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1353 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1354 vstor_packet->vm_srb.path_id = stor_device->path_id; 1355 1356 ret = vmbus_sendpacket(device->channel, vstor_packet, 1357 (sizeof(struct vstor_packet) - 1358 vmscsi_size_delta), 1359 (unsigned long)&stor_device->reset_request, 1360 VM_PKT_DATA_INBAND, 1361 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1362 if (ret != 0) 1363 return FAILED; 1364 1365 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1366 if (t == 0) 1367 return TIMEOUT_ERROR; 1368 1369 1370 /* 1371 * At this point, all outstanding requests in the adapter 1372 * should have been flushed out and return to us 1373 * There is a potential race here where the host may be in 1374 * the process of responding when we return from here. 1375 * Just wait for all in-transit packets to be accounted for 1376 * before we return from here. 1377 */ 1378 storvsc_wait_to_drain(stor_device); 1379 1380 return SUCCESS; 1381 } 1382 1383 /* 1384 * The host guarantees to respond to each command, although I/O latencies might 1385 * be unbounded on Azure. Reset the timer unconditionally to give the host a 1386 * chance to perform EH. 1387 */ 1388 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) 1389 { 1390 return BLK_EH_RESET_TIMER; 1391 } 1392 1393 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1394 { 1395 bool allowed = true; 1396 u8 scsi_op = scmnd->cmnd[0]; 1397 1398 switch (scsi_op) { 1399 /* the host does not handle WRITE_SAME, log accident usage */ 1400 case WRITE_SAME: 1401 /* 1402 * smartd sends this command and the host does not handle 1403 * this. So, don't send it. 1404 */ 1405 case SET_WINDOW: 1406 scmnd->result = ILLEGAL_REQUEST << 16; 1407 allowed = false; 1408 break; 1409 default: 1410 break; 1411 } 1412 return allowed; 1413 } 1414 1415 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1416 { 1417 int ret; 1418 struct hv_host_device *host_dev = shost_priv(host); 1419 struct hv_device *dev = host_dev->dev; 1420 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); 1421 int i; 1422 struct scatterlist *sgl; 1423 unsigned int sg_count = 0; 1424 struct vmscsi_request *vm_srb; 1425 struct scatterlist *cur_sgl; 1426 struct vmbus_packet_mpb_array *payload; 1427 u32 payload_sz; 1428 u32 length; 1429 1430 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { 1431 /* 1432 * On legacy hosts filter unimplemented commands. 1433 * Future hosts are expected to correctly handle 1434 * unsupported commands. Furthermore, it is 1435 * possible that some of the currently 1436 * unsupported commands maybe supported in 1437 * future versions of the host. 1438 */ 1439 if (!storvsc_scsi_cmd_ok(scmnd)) { 1440 scmnd->scsi_done(scmnd); 1441 return 0; 1442 } 1443 } 1444 1445 /* Setup the cmd request */ 1446 cmd_request->cmd = scmnd; 1447 1448 vm_srb = &cmd_request->vstor_packet.vm_srb; 1449 vm_srb->win8_extension.time_out_value = 60; 1450 1451 vm_srb->win8_extension.srb_flags |= 1452 SRB_FLAGS_DISABLE_SYNCH_TRANSFER; 1453 1454 /* Build the SRB */ 1455 switch (scmnd->sc_data_direction) { 1456 case DMA_TO_DEVICE: 1457 vm_srb->data_in = WRITE_TYPE; 1458 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1459 break; 1460 case DMA_FROM_DEVICE: 1461 vm_srb->data_in = READ_TYPE; 1462 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1463 break; 1464 case DMA_NONE: 1465 vm_srb->data_in = UNKNOWN_TYPE; 1466 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; 1467 break; 1468 default: 1469 /* 1470 * This is DMA_BIDIRECTIONAL or something else we are never 1471 * supposed to see here. 1472 */ 1473 WARN(1, "Unexpected data direction: %d\n", 1474 scmnd->sc_data_direction); 1475 return -EINVAL; 1476 } 1477 1478 1479 vm_srb->port_number = host_dev->port; 1480 vm_srb->path_id = scmnd->device->channel; 1481 vm_srb->target_id = scmnd->device->id; 1482 vm_srb->lun = scmnd->device->lun; 1483 1484 vm_srb->cdb_length = scmnd->cmd_len; 1485 1486 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1487 1488 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1489 sg_count = scsi_sg_count(scmnd); 1490 1491 length = scsi_bufflen(scmnd); 1492 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; 1493 payload_sz = sizeof(cmd_request->mpb); 1494 1495 if (sg_count) { 1496 if (sg_count > MAX_PAGE_BUFFER_COUNT) { 1497 1498 payload_sz = (sg_count * sizeof(u64) + 1499 sizeof(struct vmbus_packet_mpb_array)); 1500 payload = kzalloc(payload_sz, GFP_ATOMIC); 1501 if (!payload) 1502 return SCSI_MLQUEUE_DEVICE_BUSY; 1503 } 1504 1505 payload->range.len = length; 1506 payload->range.offset = sgl[0].offset; 1507 1508 cur_sgl = sgl; 1509 for (i = 0; i < sg_count; i++) { 1510 payload->range.pfn_array[i] = 1511 page_to_pfn(sg_page((cur_sgl))); 1512 cur_sgl = sg_next(cur_sgl); 1513 } 1514 1515 } else if (scsi_sglist(scmnd)) { 1516 payload->range.len = length; 1517 payload->range.offset = 1518 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); 1519 payload->range.pfn_array[0] = 1520 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; 1521 } 1522 1523 cmd_request->payload = payload; 1524 cmd_request->payload_sz = payload_sz; 1525 1526 /* Invokes the vsc to start an IO */ 1527 ret = storvsc_do_io(dev, cmd_request); 1528 1529 if (ret == -EAGAIN) { 1530 /* no more space */ 1531 return SCSI_MLQUEUE_DEVICE_BUSY; 1532 } 1533 1534 return 0; 1535 } 1536 1537 static struct scsi_host_template scsi_driver = { 1538 .module = THIS_MODULE, 1539 .name = "storvsc_host_t", 1540 .cmd_size = sizeof(struct storvsc_cmd_request), 1541 .bios_param = storvsc_get_chs, 1542 .queuecommand = storvsc_queuecommand, 1543 .eh_host_reset_handler = storvsc_host_reset_handler, 1544 .proc_name = "storvsc_host", 1545 .eh_timed_out = storvsc_eh_timed_out, 1546 .slave_configure = storvsc_device_configure, 1547 .cmd_per_lun = 255, 1548 .this_id = -1, 1549 .use_clustering = ENABLE_CLUSTERING, 1550 /* Make sure we dont get a sg segment crosses a page boundary */ 1551 .dma_boundary = PAGE_SIZE-1, 1552 .no_write_same = 1, 1553 }; 1554 1555 enum { 1556 SCSI_GUID, 1557 IDE_GUID, 1558 SFC_GUID, 1559 }; 1560 1561 static const struct hv_vmbus_device_id id_table[] = { 1562 /* SCSI guid */ 1563 { HV_SCSI_GUID, 1564 .driver_data = SCSI_GUID 1565 }, 1566 /* IDE guid */ 1567 { HV_IDE_GUID, 1568 .driver_data = IDE_GUID 1569 }, 1570 /* Fibre Channel GUID */ 1571 { 1572 HV_SYNTHFC_GUID, 1573 .driver_data = SFC_GUID 1574 }, 1575 { }, 1576 }; 1577 1578 MODULE_DEVICE_TABLE(vmbus, id_table); 1579 1580 static int storvsc_probe(struct hv_device *device, 1581 const struct hv_vmbus_device_id *dev_id) 1582 { 1583 int ret; 1584 int num_cpus = num_online_cpus(); 1585 struct Scsi_Host *host; 1586 struct hv_host_device *host_dev; 1587 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1588 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); 1589 int target = 0; 1590 struct storvsc_device *stor_device; 1591 int max_luns_per_target; 1592 int max_targets; 1593 int max_channels; 1594 int max_sub_channels = 0; 1595 1596 /* 1597 * Based on the windows host we are running on, 1598 * set state to properly communicate with the host. 1599 */ 1600 1601 if (vmbus_proto_version < VERSION_WIN8) { 1602 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1603 max_targets = STORVSC_IDE_MAX_TARGETS; 1604 max_channels = STORVSC_IDE_MAX_CHANNELS; 1605 } else { 1606 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; 1607 max_targets = STORVSC_MAX_TARGETS; 1608 max_channels = STORVSC_MAX_CHANNELS; 1609 /* 1610 * On Windows8 and above, we support sub-channels for storage. 1611 * The number of sub-channels offerred is based on the number of 1612 * VCPUs in the guest. 1613 */ 1614 max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); 1615 } 1616 1617 scsi_driver.can_queue = (max_outstanding_req_per_channel * 1618 (max_sub_channels + 1)); 1619 1620 host = scsi_host_alloc(&scsi_driver, 1621 sizeof(struct hv_host_device)); 1622 if (!host) 1623 return -ENOMEM; 1624 1625 host_dev = shost_priv(host); 1626 memset(host_dev, 0, sizeof(struct hv_host_device)); 1627 1628 host_dev->port = host->host_no; 1629 host_dev->dev = device; 1630 1631 1632 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1633 if (!stor_device) { 1634 ret = -ENOMEM; 1635 goto err_out0; 1636 } 1637 1638 stor_device->destroy = false; 1639 stor_device->open_sub_channel = false; 1640 init_waitqueue_head(&stor_device->waiting_to_drain); 1641 stor_device->device = device; 1642 stor_device->host = host; 1643 hv_set_drvdata(device, stor_device); 1644 1645 stor_device->port_number = host->host_no; 1646 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); 1647 if (ret) 1648 goto err_out1; 1649 1650 host_dev->path = stor_device->path_id; 1651 host_dev->target = stor_device->target_id; 1652 1653 switch (dev_id->driver_data) { 1654 case SFC_GUID: 1655 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; 1656 host->max_id = STORVSC_FC_MAX_TARGETS; 1657 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; 1658 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1659 host->transportt = fc_transport_template; 1660 #endif 1661 break; 1662 1663 case SCSI_GUID: 1664 host->max_lun = max_luns_per_target; 1665 host->max_id = max_targets; 1666 host->max_channel = max_channels - 1; 1667 break; 1668 1669 default: 1670 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1671 host->max_id = STORVSC_IDE_MAX_TARGETS; 1672 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; 1673 break; 1674 } 1675 /* max cmd length */ 1676 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1677 1678 /* 1679 * set the table size based on the info we got 1680 * from the host. 1681 */ 1682 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); 1683 1684 /* Register the HBA and start the scsi bus scan */ 1685 ret = scsi_add_host(host, &device->device); 1686 if (ret != 0) 1687 goto err_out2; 1688 1689 if (!dev_is_ide) { 1690 scsi_scan_host(host); 1691 } else { 1692 target = (device->dev_instance.b[5] << 8 | 1693 device->dev_instance.b[4]); 1694 ret = scsi_add_device(host, 0, target, 0); 1695 if (ret) { 1696 scsi_remove_host(host); 1697 goto err_out2; 1698 } 1699 } 1700 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1701 if (host->transportt == fc_transport_template) { 1702 fc_host_node_name(host) = stor_device->node_name; 1703 fc_host_port_name(host) = stor_device->port_name; 1704 } 1705 #endif 1706 return 0; 1707 1708 err_out2: 1709 /* 1710 * Once we have connected with the host, we would need to 1711 * to invoke storvsc_dev_remove() to rollback this state and 1712 * this call also frees up the stor_device; hence the jump around 1713 * err_out1 label. 1714 */ 1715 storvsc_dev_remove(device); 1716 goto err_out0; 1717 1718 err_out1: 1719 kfree(stor_device); 1720 1721 err_out0: 1722 scsi_host_put(host); 1723 return ret; 1724 } 1725 1726 static int storvsc_remove(struct hv_device *dev) 1727 { 1728 struct storvsc_device *stor_device = hv_get_drvdata(dev); 1729 struct Scsi_Host *host = stor_device->host; 1730 1731 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1732 if (host->transportt == fc_transport_template) 1733 fc_remove_host(host); 1734 #endif 1735 scsi_remove_host(host); 1736 storvsc_dev_remove(dev); 1737 scsi_host_put(host); 1738 1739 return 0; 1740 } 1741 1742 static struct hv_driver storvsc_drv = { 1743 .name = KBUILD_MODNAME, 1744 .id_table = id_table, 1745 .probe = storvsc_probe, 1746 .remove = storvsc_remove, 1747 }; 1748 1749 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1750 static struct fc_function_template fc_transport_functions = { 1751 .show_host_node_name = 1, 1752 .show_host_port_name = 1, 1753 }; 1754 #endif 1755 1756 static int __init storvsc_drv_init(void) 1757 { 1758 int ret; 1759 1760 /* 1761 * Divide the ring buffer data size (which is 1 page less 1762 * than the ring buffer size since that page is reserved for 1763 * the ring buffer indices) by the max request size (which is 1764 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 1765 */ 1766 max_outstanding_req_per_channel = 1767 ((storvsc_ringbuffer_size - PAGE_SIZE) / 1768 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 1769 sizeof(struct vstor_packet) + sizeof(u64) - 1770 vmscsi_size_delta, 1771 sizeof(u64))); 1772 1773 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1774 fc_transport_template = fc_attach_transport(&fc_transport_functions); 1775 if (!fc_transport_template) 1776 return -ENODEV; 1777 1778 /* 1779 * Install Hyper-V specific timeout handler. 1780 */ 1781 fc_transport_template->eh_timed_out = storvsc_eh_timed_out; 1782 #endif 1783 1784 ret = vmbus_driver_register(&storvsc_drv); 1785 1786 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1787 if (ret) 1788 fc_release_transport(fc_transport_template); 1789 #endif 1790 1791 return ret; 1792 } 1793 1794 static void __exit storvsc_drv_exit(void) 1795 { 1796 vmbus_driver_unregister(&storvsc_drv); 1797 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1798 fc_release_transport(fc_transport_template); 1799 #endif 1800 } 1801 1802 MODULE_LICENSE("GPL"); 1803 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 1804 module_init(storvsc_drv_init); 1805 module_exit(storvsc_drv_exit); 1806