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 #define SP_UNTAGGED ((unsigned char) ~0) 140 #define SRB_SIMPLE_TAG_REQUEST 0x20 141 142 /* 143 * Platform neutral description of a scsi request - 144 * this remains the same across the write regardless of 32/64 bit 145 * note: it's patterned off the SCSI_PASS_THROUGH structure 146 */ 147 #define STORVSC_MAX_CMD_LEN 0x10 148 149 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 150 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 151 152 #define STORVSC_SENSE_BUFFER_SIZE 0x14 153 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 154 155 /* 156 * Sense buffer size changed in win8; have a run-time 157 * variable to track the size we should use. This value will 158 * likely change during protocol negotiation but it is valid 159 * to start by assuming pre-Win8. 160 */ 161 static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; 162 163 /* 164 * The storage protocol version is determined during the 165 * initial exchange with the host. It will indicate which 166 * storage functionality is available in the host. 167 */ 168 static int vmstor_proto_version; 169 170 #define STORVSC_LOGGING_NONE 0 171 #define STORVSC_LOGGING_ERROR 1 172 #define STORVSC_LOGGING_WARN 2 173 174 static int logging_level = STORVSC_LOGGING_ERROR; 175 module_param(logging_level, int, S_IRUGO|S_IWUSR); 176 MODULE_PARM_DESC(logging_level, 177 "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); 178 179 static inline bool do_logging(int level) 180 { 181 return logging_level >= level; 182 } 183 184 #define storvsc_log(dev, level, fmt, ...) \ 185 do { \ 186 if (do_logging(level)) \ 187 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ 188 } while (0) 189 190 struct vmscsi_win8_extension { 191 /* 192 * The following were added in Windows 8 193 */ 194 u16 reserve; 195 u8 queue_tag; 196 u8 queue_action; 197 u32 srb_flags; 198 u32 time_out_value; 199 u32 queue_sort_ey; 200 } __packed; 201 202 struct vmscsi_request { 203 u16 length; 204 u8 srb_status; 205 u8 scsi_status; 206 207 u8 port_number; 208 u8 path_id; 209 u8 target_id; 210 u8 lun; 211 212 u8 cdb_length; 213 u8 sense_info_length; 214 u8 data_in; 215 u8 reserved; 216 217 u32 data_transfer_length; 218 219 union { 220 u8 cdb[STORVSC_MAX_CMD_LEN]; 221 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; 222 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; 223 }; 224 /* 225 * The following was added in win8. 226 */ 227 struct vmscsi_win8_extension win8_extension; 228 229 } __attribute((packed)); 230 231 232 /* 233 * The size of the vmscsi_request has changed in win8. The 234 * additional size is because of new elements added to the 235 * structure. These elements are valid only when we are talking 236 * to a win8 host. 237 * Track the correction to size we need to apply. This value 238 * will likely change during protocol negotiation but it is 239 * valid to start by assuming pre-Win8. 240 */ 241 static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 242 243 /* 244 * The list of storage protocols in order of preference. 245 */ 246 struct vmstor_protocol { 247 int protocol_version; 248 int sense_buffer_size; 249 int vmscsi_size_delta; 250 }; 251 252 253 static const struct vmstor_protocol vmstor_protocols[] = { 254 { 255 VMSTOR_PROTO_VERSION_WIN10, 256 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 257 0 258 }, 259 { 260 VMSTOR_PROTO_VERSION_WIN8_1, 261 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 262 0 263 }, 264 { 265 VMSTOR_PROTO_VERSION_WIN8, 266 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 267 0 268 }, 269 { 270 VMSTOR_PROTO_VERSION_WIN7, 271 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 272 sizeof(struct vmscsi_win8_extension), 273 }, 274 { 275 VMSTOR_PROTO_VERSION_WIN6, 276 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 277 sizeof(struct vmscsi_win8_extension), 278 } 279 }; 280 281 282 /* 283 * This structure is sent during the initialization phase to get the different 284 * properties of the channel. 285 */ 286 287 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 288 289 struct vmstorage_channel_properties { 290 u32 reserved; 291 u16 max_channel_cnt; 292 u16 reserved1; 293 294 u32 flags; 295 u32 max_transfer_bytes; 296 297 u64 reserved2; 298 } __packed; 299 300 /* This structure is sent during the storage protocol negotiations. */ 301 struct vmstorage_protocol_version { 302 /* Major (MSW) and minor (LSW) version numbers. */ 303 u16 major_minor; 304 305 /* 306 * Revision number is auto-incremented whenever this file is changed 307 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 308 * definitely indicate incompatibility--but it does indicate mismatched 309 * builds. 310 * This is only used on the windows side. Just set it to 0. 311 */ 312 u16 revision; 313 } __packed; 314 315 /* Channel Property Flags */ 316 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 317 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 318 319 struct vstor_packet { 320 /* Requested operation type */ 321 enum vstor_packet_operation operation; 322 323 /* Flags - see below for values */ 324 u32 flags; 325 326 /* Status of the request returned from the server side. */ 327 u32 status; 328 329 /* Data payload area */ 330 union { 331 /* 332 * Structure used to forward SCSI commands from the 333 * client to the server. 334 */ 335 struct vmscsi_request vm_srb; 336 337 /* Structure used to query channel properties. */ 338 struct vmstorage_channel_properties storage_channel_properties; 339 340 /* Used during version negotiations. */ 341 struct vmstorage_protocol_version version; 342 343 /* Fibre channel address packet */ 344 struct hv_fc_wwn_packet wwn_packet; 345 346 /* Number of sub-channels to create */ 347 u16 sub_channel_count; 348 349 /* This will be the maximum of the union members */ 350 u8 buffer[0x34]; 351 }; 352 } __packed; 353 354 /* 355 * Packet Flags: 356 * 357 * This flag indicates that the server should send back a completion for this 358 * packet. 359 */ 360 361 #define REQUEST_COMPLETION_FLAG 0x1 362 363 /* Matches Windows-end */ 364 enum storvsc_request_type { 365 WRITE_TYPE = 0, 366 READ_TYPE, 367 UNKNOWN_TYPE, 368 }; 369 370 /* 371 * SRB status codes and masks; a subset of the codes used here. 372 */ 373 374 #define SRB_STATUS_AUTOSENSE_VALID 0x80 375 #define SRB_STATUS_QUEUE_FROZEN 0x40 376 #define SRB_STATUS_INVALID_LUN 0x20 377 #define SRB_STATUS_SUCCESS 0x01 378 #define SRB_STATUS_ABORTED 0x02 379 #define SRB_STATUS_ERROR 0x04 380 #define SRB_STATUS_DATA_OVERRUN 0x12 381 382 #define SRB_STATUS(status) \ 383 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) 384 /* 385 * This is the end of Protocol specific defines. 386 */ 387 388 static int storvsc_ringbuffer_size = (256 * PAGE_SIZE); 389 static u32 max_outstanding_req_per_channel; 390 391 static int storvsc_vcpus_per_sub_channel = 4; 392 393 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 394 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 395 396 module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); 397 MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); 398 /* 399 * Timeout in seconds for all devices managed by this driver. 400 */ 401 static int storvsc_timeout = 180; 402 403 static int msft_blist_flags = BLIST_TRY_VPD_PAGES; 404 405 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 406 static struct scsi_transport_template *fc_transport_template; 407 #endif 408 409 static void storvsc_on_channel_callback(void *context); 410 411 #define STORVSC_MAX_LUNS_PER_TARGET 255 412 #define STORVSC_MAX_TARGETS 2 413 #define STORVSC_MAX_CHANNELS 8 414 415 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 416 #define STORVSC_FC_MAX_TARGETS 128 417 #define STORVSC_FC_MAX_CHANNELS 8 418 419 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 420 #define STORVSC_IDE_MAX_TARGETS 1 421 #define STORVSC_IDE_MAX_CHANNELS 1 422 423 struct storvsc_cmd_request { 424 struct scsi_cmnd *cmd; 425 426 struct hv_device *device; 427 428 /* Synchronize the request/response if needed */ 429 struct completion wait_event; 430 431 struct vmbus_channel_packet_multipage_buffer mpb; 432 struct vmbus_packet_mpb_array *payload; 433 u32 payload_sz; 434 435 struct vstor_packet vstor_packet; 436 }; 437 438 439 /* A storvsc device is a device object that contains a vmbus channel */ 440 struct storvsc_device { 441 struct hv_device *device; 442 443 bool destroy; 444 bool drain_notify; 445 bool open_sub_channel; 446 atomic_t num_outstanding_req; 447 struct Scsi_Host *host; 448 449 wait_queue_head_t waiting_to_drain; 450 451 /* 452 * Each unique Port/Path/Target represents 1 channel ie scsi 453 * controller. In reality, the pathid, targetid is always 0 454 * and the port is set by us 455 */ 456 unsigned int port_number; 457 unsigned char path_id; 458 unsigned char target_id; 459 460 /* 461 * Max I/O, the device can support. 462 */ 463 u32 max_transfer_bytes; 464 /* 465 * Number of sub-channels we will open. 466 */ 467 u16 num_sc; 468 struct vmbus_channel **stor_chns; 469 /* 470 * Mask of CPUs bound to subchannels. 471 */ 472 struct cpumask alloced_cpus; 473 /* Used for vsc/vsp channel reset process */ 474 struct storvsc_cmd_request init_request; 475 struct storvsc_cmd_request reset_request; 476 /* 477 * Currently active port and node names for FC devices. 478 */ 479 u64 node_name; 480 u64 port_name; 481 }; 482 483 struct hv_host_device { 484 struct hv_device *dev; 485 unsigned int port; 486 unsigned char path; 487 unsigned char target; 488 }; 489 490 struct storvsc_scan_work { 491 struct work_struct work; 492 struct Scsi_Host *host; 493 u8 lun; 494 u8 tgt_id; 495 }; 496 497 static void storvsc_device_scan(struct work_struct *work) 498 { 499 struct storvsc_scan_work *wrk; 500 struct scsi_device *sdev; 501 502 wrk = container_of(work, struct storvsc_scan_work, work); 503 504 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); 505 if (!sdev) 506 goto done; 507 scsi_rescan_device(&sdev->sdev_gendev); 508 scsi_device_put(sdev); 509 510 done: 511 kfree(wrk); 512 } 513 514 static void storvsc_host_scan(struct work_struct *work) 515 { 516 struct storvsc_scan_work *wrk; 517 struct Scsi_Host *host; 518 struct scsi_device *sdev; 519 520 wrk = container_of(work, struct storvsc_scan_work, work); 521 host = wrk->host; 522 523 /* 524 * Before scanning the host, first check to see if any of the 525 * currrently known devices have been hot removed. We issue a 526 * "unit ready" command against all currently known devices. 527 * This I/O will result in an error for devices that have been 528 * removed. As part of handling the I/O error, we remove the device. 529 * 530 * When a LUN is added or removed, the host sends us a signal to 531 * scan the host. Thus we are forced to discover the LUNs that 532 * may have been removed this way. 533 */ 534 mutex_lock(&host->scan_mutex); 535 shost_for_each_device(sdev, host) 536 scsi_test_unit_ready(sdev, 1, 1, NULL); 537 mutex_unlock(&host->scan_mutex); 538 /* 539 * Now scan the host to discover LUNs that may have been added. 540 */ 541 scsi_scan_host(host); 542 543 kfree(wrk); 544 } 545 546 static void storvsc_remove_lun(struct work_struct *work) 547 { 548 struct storvsc_scan_work *wrk; 549 struct scsi_device *sdev; 550 551 wrk = container_of(work, struct storvsc_scan_work, work); 552 if (!scsi_host_get(wrk->host)) 553 goto done; 554 555 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); 556 557 if (sdev) { 558 scsi_remove_device(sdev); 559 scsi_device_put(sdev); 560 } 561 scsi_host_put(wrk->host); 562 563 done: 564 kfree(wrk); 565 } 566 567 568 /* 569 * We can get incoming messages from the host that are not in response to 570 * messages that we have sent out. An example of this would be messages 571 * received by the guest to notify dynamic addition/removal of LUNs. To 572 * deal with potential race conditions where the driver may be in the 573 * midst of being unloaded when we might receive an unsolicited message 574 * from the host, we have implemented a mechanism to gurantee sequential 575 * consistency: 576 * 577 * 1) Once the device is marked as being destroyed, we will fail all 578 * outgoing messages. 579 * 2) We permit incoming messages when the device is being destroyed, 580 * only to properly account for messages already sent out. 581 */ 582 583 static inline struct storvsc_device *get_out_stor_device( 584 struct hv_device *device) 585 { 586 struct storvsc_device *stor_device; 587 588 stor_device = hv_get_drvdata(device); 589 590 if (stor_device && stor_device->destroy) 591 stor_device = NULL; 592 593 return stor_device; 594 } 595 596 597 static inline void storvsc_wait_to_drain(struct storvsc_device *dev) 598 { 599 dev->drain_notify = true; 600 wait_event(dev->waiting_to_drain, 601 atomic_read(&dev->num_outstanding_req) == 0); 602 dev->drain_notify = false; 603 } 604 605 static inline struct storvsc_device *get_in_stor_device( 606 struct hv_device *device) 607 { 608 struct storvsc_device *stor_device; 609 610 stor_device = hv_get_drvdata(device); 611 612 if (!stor_device) 613 goto get_in_err; 614 615 /* 616 * If the device is being destroyed; allow incoming 617 * traffic only to cleanup outstanding requests. 618 */ 619 620 if (stor_device->destroy && 621 (atomic_read(&stor_device->num_outstanding_req) == 0)) 622 stor_device = NULL; 623 624 get_in_err: 625 return stor_device; 626 627 } 628 629 static void handle_sc_creation(struct vmbus_channel *new_sc) 630 { 631 struct hv_device *device = new_sc->primary_channel->device_obj; 632 struct storvsc_device *stor_device; 633 struct vmstorage_channel_properties props; 634 635 stor_device = get_out_stor_device(device); 636 if (!stor_device) 637 return; 638 639 if (stor_device->open_sub_channel == false) 640 return; 641 642 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 643 644 vmbus_open(new_sc, 645 storvsc_ringbuffer_size, 646 storvsc_ringbuffer_size, 647 (void *)&props, 648 sizeof(struct vmstorage_channel_properties), 649 storvsc_on_channel_callback, new_sc); 650 651 if (new_sc->state == CHANNEL_OPENED_STATE) { 652 stor_device->stor_chns[new_sc->target_cpu] = new_sc; 653 cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); 654 } 655 } 656 657 static void handle_multichannel_storage(struct hv_device *device, int max_chns) 658 { 659 struct storvsc_device *stor_device; 660 int num_cpus = num_online_cpus(); 661 int num_sc; 662 struct storvsc_cmd_request *request; 663 struct vstor_packet *vstor_packet; 664 int ret, t; 665 666 num_sc = ((max_chns > num_cpus) ? num_cpus : max_chns); 667 stor_device = get_out_stor_device(device); 668 if (!stor_device) 669 return; 670 671 stor_device->num_sc = num_sc; 672 request = &stor_device->init_request; 673 vstor_packet = &request->vstor_packet; 674 675 stor_device->open_sub_channel = true; 676 /* 677 * Establish a handler for dealing with subchannels. 678 */ 679 vmbus_set_sc_create_callback(device->channel, handle_sc_creation); 680 681 /* 682 * Check to see if sub-channels have already been created. This 683 * can happen when this driver is re-loaded after unloading. 684 */ 685 686 if (vmbus_are_subchannels_present(device->channel)) 687 return; 688 689 stor_device->open_sub_channel = false; 690 /* 691 * Request the host to create sub-channels. 692 */ 693 memset(request, 0, sizeof(struct storvsc_cmd_request)); 694 init_completion(&request->wait_event); 695 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; 696 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 697 vstor_packet->sub_channel_count = num_sc; 698 699 ret = vmbus_sendpacket(device->channel, vstor_packet, 700 (sizeof(struct vstor_packet) - 701 vmscsi_size_delta), 702 (unsigned long)request, 703 VM_PKT_DATA_INBAND, 704 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 705 706 if (ret != 0) 707 return; 708 709 t = wait_for_completion_timeout(&request->wait_event, 10*HZ); 710 if (t == 0) 711 return; 712 713 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 714 vstor_packet->status != 0) 715 return; 716 717 /* 718 * Now that we created the sub-channels, invoke the check; this 719 * may trigger the callback. 720 */ 721 stor_device->open_sub_channel = true; 722 vmbus_are_subchannels_present(device->channel); 723 } 724 725 static void cache_wwn(struct storvsc_device *stor_device, 726 struct vstor_packet *vstor_packet) 727 { 728 /* 729 * Cache the currently active port and node ww names. 730 */ 731 if (vstor_packet->wwn_packet.primary_active) { 732 stor_device->node_name = 733 wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); 734 stor_device->port_name = 735 wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); 736 } else { 737 stor_device->node_name = 738 wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); 739 stor_device->port_name = 740 wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); 741 } 742 } 743 744 745 static int storvsc_execute_vstor_op(struct hv_device *device, 746 struct storvsc_cmd_request *request, 747 bool status_check) 748 { 749 struct vstor_packet *vstor_packet; 750 int ret, t; 751 752 vstor_packet = &request->vstor_packet; 753 754 init_completion(&request->wait_event); 755 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 756 757 ret = vmbus_sendpacket(device->channel, vstor_packet, 758 (sizeof(struct vstor_packet) - 759 vmscsi_size_delta), 760 (unsigned long)request, 761 VM_PKT_DATA_INBAND, 762 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 763 if (ret != 0) 764 return ret; 765 766 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 767 if (t == 0) 768 return -ETIMEDOUT; 769 770 if (!status_check) 771 return ret; 772 773 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 774 vstor_packet->status != 0) 775 return -EINVAL; 776 777 return ret; 778 } 779 780 static int storvsc_channel_init(struct hv_device *device, bool is_fc) 781 { 782 struct storvsc_device *stor_device; 783 struct storvsc_cmd_request *request; 784 struct vstor_packet *vstor_packet; 785 int ret, i; 786 int max_chns; 787 bool process_sub_channels = false; 788 789 stor_device = get_out_stor_device(device); 790 if (!stor_device) 791 return -ENODEV; 792 793 request = &stor_device->init_request; 794 vstor_packet = &request->vstor_packet; 795 796 /* 797 * Now, initiate the vsc/vsp initialization protocol on the open 798 * channel 799 */ 800 memset(request, 0, sizeof(struct storvsc_cmd_request)); 801 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 802 ret = storvsc_execute_vstor_op(device, request, true); 803 if (ret) 804 return ret; 805 /* 806 * Query host supported protocol version. 807 */ 808 809 for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { 810 /* reuse the packet for version range supported */ 811 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 812 vstor_packet->operation = 813 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 814 815 vstor_packet->version.major_minor = 816 vmstor_protocols[i].protocol_version; 817 818 /* 819 * The revision number is only used in Windows; set it to 0. 820 */ 821 vstor_packet->version.revision = 0; 822 ret = storvsc_execute_vstor_op(device, request, false); 823 if (ret != 0) 824 return ret; 825 826 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) 827 return -EINVAL; 828 829 if (vstor_packet->status == 0) { 830 vmstor_proto_version = 831 vmstor_protocols[i].protocol_version; 832 833 sense_buffer_size = 834 vmstor_protocols[i].sense_buffer_size; 835 836 vmscsi_size_delta = 837 vmstor_protocols[i].vmscsi_size_delta; 838 839 break; 840 } 841 } 842 843 if (vstor_packet->status != 0) 844 return -EINVAL; 845 846 847 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 848 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 849 ret = storvsc_execute_vstor_op(device, request, true); 850 if (ret != 0) 851 return ret; 852 853 /* 854 * Check to see if multi-channel support is there. 855 * Hosts that implement protocol version of 5.1 and above 856 * support multi-channel. 857 */ 858 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; 859 860 /* 861 * Allocate state to manage the sub-channels. 862 * We allocate an array based on the numbers of possible CPUs 863 * (Hyper-V does not support cpu online/offline). 864 * This Array will be sparseley populated with unique 865 * channels - primary + sub-channels. 866 * We will however populate all the slots to evenly distribute 867 * the load. 868 */ 869 stor_device->stor_chns = kzalloc(sizeof(void *) * num_possible_cpus(), 870 GFP_KERNEL); 871 if (stor_device->stor_chns == NULL) 872 return -ENOMEM; 873 874 stor_device->stor_chns[device->channel->target_cpu] = device->channel; 875 cpumask_set_cpu(device->channel->target_cpu, 876 &stor_device->alloced_cpus); 877 878 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { 879 if (vstor_packet->storage_channel_properties.flags & 880 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) 881 process_sub_channels = true; 882 } 883 stor_device->max_transfer_bytes = 884 vstor_packet->storage_channel_properties.max_transfer_bytes; 885 886 if (!is_fc) 887 goto done; 888 889 /* 890 * For FC devices retrieve FC HBA data. 891 */ 892 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 893 vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; 894 ret = storvsc_execute_vstor_op(device, request, true); 895 if (ret != 0) 896 return ret; 897 898 /* 899 * Cache the currently active port and node ww names. 900 */ 901 cache_wwn(stor_device, vstor_packet); 902 903 done: 904 905 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 906 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 907 ret = storvsc_execute_vstor_op(device, request, true); 908 if (ret != 0) 909 return ret; 910 911 if (process_sub_channels) 912 handle_multichannel_storage(device, max_chns); 913 914 return ret; 915 } 916 917 static void storvsc_handle_error(struct vmscsi_request *vm_srb, 918 struct scsi_cmnd *scmnd, 919 struct Scsi_Host *host, 920 u8 asc, u8 ascq) 921 { 922 struct storvsc_scan_work *wrk; 923 void (*process_err_fn)(struct work_struct *work); 924 bool do_work = false; 925 926 switch (SRB_STATUS(vm_srb->srb_status)) { 927 case SRB_STATUS_ERROR: 928 /* 929 * Let upper layer deal with error when 930 * sense message is present. 931 */ 932 933 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) 934 break; 935 /* 936 * If there is an error; offline the device since all 937 * error recovery strategies would have already been 938 * deployed on the host side. However, if the command 939 * were a pass-through command deal with it appropriately. 940 */ 941 switch (scmnd->cmnd[0]) { 942 case ATA_16: 943 case ATA_12: 944 set_host_byte(scmnd, DID_PASSTHROUGH); 945 break; 946 /* 947 * On Some Windows hosts TEST_UNIT_READY command can return 948 * SRB_STATUS_ERROR, let the upper level code deal with it 949 * based on the sense information. 950 */ 951 case TEST_UNIT_READY: 952 break; 953 default: 954 set_host_byte(scmnd, DID_TARGET_FAILURE); 955 } 956 break; 957 case SRB_STATUS_INVALID_LUN: 958 do_work = true; 959 process_err_fn = storvsc_remove_lun; 960 break; 961 case SRB_STATUS_ABORTED: 962 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && 963 (asc == 0x2a) && (ascq == 0x9)) { 964 do_work = true; 965 process_err_fn = storvsc_device_scan; 966 /* 967 * Retry the I/O that trigerred this. 968 */ 969 set_host_byte(scmnd, DID_REQUEUE); 970 } 971 break; 972 } 973 974 if (!do_work) 975 return; 976 977 /* 978 * We need to schedule work to process this error; schedule it. 979 */ 980 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 981 if (!wrk) { 982 set_host_byte(scmnd, DID_TARGET_FAILURE); 983 return; 984 } 985 986 wrk->host = host; 987 wrk->lun = vm_srb->lun; 988 wrk->tgt_id = vm_srb->target_id; 989 INIT_WORK(&wrk->work, process_err_fn); 990 schedule_work(&wrk->work); 991 } 992 993 994 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, 995 struct storvsc_device *stor_dev) 996 { 997 struct scsi_cmnd *scmnd = cmd_request->cmd; 998 struct scsi_sense_hdr sense_hdr; 999 struct vmscsi_request *vm_srb; 1000 u32 data_transfer_length; 1001 struct Scsi_Host *host; 1002 u32 payload_sz = cmd_request->payload_sz; 1003 void *payload = cmd_request->payload; 1004 1005 host = stor_dev->host; 1006 1007 vm_srb = &cmd_request->vstor_packet.vm_srb; 1008 data_transfer_length = vm_srb->data_transfer_length; 1009 1010 scmnd->result = vm_srb->scsi_status; 1011 1012 if (scmnd->result) { 1013 if (scsi_normalize_sense(scmnd->sense_buffer, 1014 SCSI_SENSE_BUFFERSIZE, &sense_hdr) && 1015 !(sense_hdr.sense_key == NOT_READY && 1016 sense_hdr.asc == 0x03A) && 1017 do_logging(STORVSC_LOGGING_ERROR)) 1018 scsi_print_sense_hdr(scmnd->device, "storvsc", 1019 &sense_hdr); 1020 } 1021 1022 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { 1023 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 1024 sense_hdr.ascq); 1025 /* 1026 * The Windows driver set data_transfer_length on 1027 * SRB_STATUS_DATA_OVERRUN. On other errors, this value 1028 * is untouched. In these cases we set it to 0. 1029 */ 1030 if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) 1031 data_transfer_length = 0; 1032 } 1033 1034 scsi_set_resid(scmnd, 1035 cmd_request->payload->range.len - data_transfer_length); 1036 1037 scmnd->scsi_done(scmnd); 1038 1039 if (payload_sz > 1040 sizeof(struct vmbus_channel_packet_multipage_buffer)) 1041 kfree(payload); 1042 } 1043 1044 static void storvsc_on_io_completion(struct storvsc_device *stor_device, 1045 struct vstor_packet *vstor_packet, 1046 struct storvsc_cmd_request *request) 1047 { 1048 struct vstor_packet *stor_pkt; 1049 struct hv_device *device = stor_device->device; 1050 1051 stor_pkt = &request->vstor_packet; 1052 1053 /* 1054 * The current SCSI handling on the host side does 1055 * not correctly handle: 1056 * INQUIRY command with page code parameter set to 0x80 1057 * MODE_SENSE command with cmd[2] == 0x1c 1058 * 1059 * Setup srb and scsi status so this won't be fatal. 1060 * We do this so we can distinguish truly fatal failues 1061 * (srb status == 0x4) and off-line the device in that case. 1062 */ 1063 1064 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 1065 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 1066 vstor_packet->vm_srb.scsi_status = 0; 1067 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 1068 } 1069 1070 1071 /* Copy over the status...etc */ 1072 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 1073 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 1074 stor_pkt->vm_srb.sense_info_length = 1075 vstor_packet->vm_srb.sense_info_length; 1076 1077 if (vstor_packet->vm_srb.scsi_status != 0 || 1078 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) 1079 storvsc_log(device, STORVSC_LOGGING_WARN, 1080 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 1081 stor_pkt->vm_srb.cdb[0], 1082 vstor_packet->vm_srb.scsi_status, 1083 vstor_packet->vm_srb.srb_status); 1084 1085 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1086 /* CHECK_CONDITION */ 1087 if (vstor_packet->vm_srb.srb_status & 1088 SRB_STATUS_AUTOSENSE_VALID) { 1089 /* autosense data available */ 1090 1091 storvsc_log(device, STORVSC_LOGGING_WARN, 1092 "stor pkt %p autosense data valid - len %d\n", 1093 request, vstor_packet->vm_srb.sense_info_length); 1094 1095 memcpy(request->cmd->sense_buffer, 1096 vstor_packet->vm_srb.sense_data, 1097 vstor_packet->vm_srb.sense_info_length); 1098 1099 } 1100 } 1101 1102 stor_pkt->vm_srb.data_transfer_length = 1103 vstor_packet->vm_srb.data_transfer_length; 1104 1105 storvsc_command_completion(request, stor_device); 1106 1107 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1108 stor_device->drain_notify) 1109 wake_up(&stor_device->waiting_to_drain); 1110 1111 1112 } 1113 1114 static void storvsc_on_receive(struct storvsc_device *stor_device, 1115 struct vstor_packet *vstor_packet, 1116 struct storvsc_cmd_request *request) 1117 { 1118 struct storvsc_scan_work *work; 1119 1120 switch (vstor_packet->operation) { 1121 case VSTOR_OPERATION_COMPLETE_IO: 1122 storvsc_on_io_completion(stor_device, vstor_packet, request); 1123 break; 1124 1125 case VSTOR_OPERATION_REMOVE_DEVICE: 1126 case VSTOR_OPERATION_ENUMERATE_BUS: 1127 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1128 if (!work) 1129 return; 1130 1131 INIT_WORK(&work->work, storvsc_host_scan); 1132 work->host = stor_device->host; 1133 schedule_work(&work->work); 1134 break; 1135 1136 case VSTOR_OPERATION_FCHBA_DATA: 1137 cache_wwn(stor_device, vstor_packet); 1138 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1139 fc_host_node_name(stor_device->host) = stor_device->node_name; 1140 fc_host_port_name(stor_device->host) = stor_device->port_name; 1141 #endif 1142 break; 1143 default: 1144 break; 1145 } 1146 } 1147 1148 static void storvsc_on_channel_callback(void *context) 1149 { 1150 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1151 struct hv_device *device; 1152 struct storvsc_device *stor_device; 1153 u32 bytes_recvd; 1154 u64 request_id; 1155 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; 1156 struct storvsc_cmd_request *request; 1157 int ret; 1158 1159 if (channel->primary_channel != NULL) 1160 device = channel->primary_channel->device_obj; 1161 else 1162 device = channel->device_obj; 1163 1164 stor_device = get_in_stor_device(device); 1165 if (!stor_device) 1166 return; 1167 1168 do { 1169 ret = vmbus_recvpacket(channel, packet, 1170 ALIGN((sizeof(struct vstor_packet) - 1171 vmscsi_size_delta), 8), 1172 &bytes_recvd, &request_id); 1173 if (ret == 0 && bytes_recvd > 0) { 1174 1175 request = (struct storvsc_cmd_request *) 1176 (unsigned long)request_id; 1177 1178 if ((request == &stor_device->init_request) || 1179 (request == &stor_device->reset_request)) { 1180 1181 memcpy(&request->vstor_packet, packet, 1182 (sizeof(struct vstor_packet) - 1183 vmscsi_size_delta)); 1184 complete(&request->wait_event); 1185 } else { 1186 storvsc_on_receive(stor_device, 1187 (struct vstor_packet *)packet, 1188 request); 1189 } 1190 } else { 1191 break; 1192 } 1193 } while (1); 1194 1195 return; 1196 } 1197 1198 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, 1199 bool is_fc) 1200 { 1201 struct vmstorage_channel_properties props; 1202 int ret; 1203 1204 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1205 1206 ret = vmbus_open(device->channel, 1207 ring_size, 1208 ring_size, 1209 (void *)&props, 1210 sizeof(struct vmstorage_channel_properties), 1211 storvsc_on_channel_callback, device->channel); 1212 1213 if (ret != 0) 1214 return ret; 1215 1216 ret = storvsc_channel_init(device, is_fc); 1217 1218 return ret; 1219 } 1220 1221 static int storvsc_dev_remove(struct hv_device *device) 1222 { 1223 struct storvsc_device *stor_device; 1224 unsigned long flags; 1225 1226 stor_device = hv_get_drvdata(device); 1227 1228 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1229 stor_device->destroy = true; 1230 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1231 1232 /* 1233 * At this point, all outbound traffic should be disable. We 1234 * only allow inbound traffic (responses) to proceed so that 1235 * outstanding requests can be completed. 1236 */ 1237 1238 storvsc_wait_to_drain(stor_device); 1239 1240 /* 1241 * Since we have already drained, we don't need to busy wait 1242 * as was done in final_release_stor_device() 1243 * Note that we cannot set the ext pointer to NULL until 1244 * we have drained - to drain the outgoing packets, we need to 1245 * allow incoming packets. 1246 */ 1247 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1248 hv_set_drvdata(device, NULL); 1249 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1250 1251 /* Close the channel */ 1252 vmbus_close(device->channel); 1253 1254 kfree(stor_device->stor_chns); 1255 kfree(stor_device); 1256 return 0; 1257 } 1258 1259 static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, 1260 u16 q_num) 1261 { 1262 u16 slot = 0; 1263 u16 hash_qnum; 1264 struct cpumask alloced_mask; 1265 int num_channels, tgt_cpu; 1266 1267 if (stor_device->num_sc == 0) 1268 return stor_device->device->channel; 1269 1270 /* 1271 * Our channel array is sparsley populated and we 1272 * initiated I/O on a processor/hw-q that does not 1273 * currently have a designated channel. Fix this. 1274 * The strategy is simple: 1275 * I. Ensure NUMA locality 1276 * II. Distribute evenly (best effort) 1277 * III. Mapping is persistent. 1278 */ 1279 1280 cpumask_and(&alloced_mask, &stor_device->alloced_cpus, 1281 cpumask_of_node(cpu_to_node(q_num))); 1282 1283 num_channels = cpumask_weight(&alloced_mask); 1284 if (num_channels == 0) 1285 return stor_device->device->channel; 1286 1287 hash_qnum = q_num; 1288 while (hash_qnum >= num_channels) 1289 hash_qnum -= num_channels; 1290 1291 for_each_cpu(tgt_cpu, &alloced_mask) { 1292 if (slot == hash_qnum) 1293 break; 1294 slot++; 1295 } 1296 1297 stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; 1298 1299 return stor_device->stor_chns[q_num]; 1300 } 1301 1302 1303 static int storvsc_do_io(struct hv_device *device, 1304 struct storvsc_cmd_request *request, u16 q_num) 1305 { 1306 struct storvsc_device *stor_device; 1307 struct vstor_packet *vstor_packet; 1308 struct vmbus_channel *outgoing_channel; 1309 int ret = 0; 1310 struct cpumask alloced_mask; 1311 int tgt_cpu; 1312 1313 vstor_packet = &request->vstor_packet; 1314 stor_device = get_out_stor_device(device); 1315 1316 if (!stor_device) 1317 return -ENODEV; 1318 1319 1320 request->device = device; 1321 /* 1322 * Select an an appropriate channel to send the request out. 1323 */ 1324 1325 if (stor_device->stor_chns[q_num] != NULL) { 1326 outgoing_channel = stor_device->stor_chns[q_num]; 1327 if (outgoing_channel->target_cpu == smp_processor_id()) { 1328 /* 1329 * Ideally, we want to pick a different channel if 1330 * available on the same NUMA node. 1331 */ 1332 cpumask_and(&alloced_mask, &stor_device->alloced_cpus, 1333 cpumask_of_node(cpu_to_node(q_num))); 1334 for_each_cpu(tgt_cpu, &alloced_mask) { 1335 if (tgt_cpu != outgoing_channel->target_cpu) { 1336 outgoing_channel = 1337 stor_device->stor_chns[tgt_cpu]; 1338 break; 1339 } 1340 } 1341 } 1342 } else { 1343 outgoing_channel = get_og_chn(stor_device, q_num); 1344 } 1345 1346 1347 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1348 1349 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1350 vmscsi_size_delta); 1351 1352 1353 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1354 1355 1356 vstor_packet->vm_srb.data_transfer_length = 1357 request->payload->range.len; 1358 1359 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1360 1361 if (request->payload->range.len) { 1362 1363 ret = vmbus_sendpacket_mpb_desc(outgoing_channel, 1364 request->payload, request->payload_sz, 1365 vstor_packet, 1366 (sizeof(struct vstor_packet) - 1367 vmscsi_size_delta), 1368 (unsigned long)request); 1369 } else { 1370 ret = vmbus_sendpacket(outgoing_channel, vstor_packet, 1371 (sizeof(struct vstor_packet) - 1372 vmscsi_size_delta), 1373 (unsigned long)request, 1374 VM_PKT_DATA_INBAND, 1375 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1376 } 1377 1378 if (ret != 0) 1379 return ret; 1380 1381 atomic_inc(&stor_device->num_outstanding_req); 1382 1383 return ret; 1384 } 1385 1386 static int storvsc_device_configure(struct scsi_device *sdevice) 1387 { 1388 1389 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); 1390 1391 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1392 1393 /* Ensure there are no gaps in presented sgls */ 1394 blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1); 1395 1396 sdevice->no_write_same = 1; 1397 1398 /* 1399 * Add blist flags to permit the reading of the VPD pages even when 1400 * the target may claim SPC-2 compliance. MSFT targets currently 1401 * claim SPC-2 compliance while they implement post SPC-2 features. 1402 * With this patch we can correctly handle WRITE_SAME_16 issues. 1403 */ 1404 sdevice->sdev_bflags |= msft_blist_flags; 1405 1406 /* 1407 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 1408 * if the device is a MSFT virtual device. If the host is 1409 * WIN10 or newer, allow write_same. 1410 */ 1411 if (!strncmp(sdevice->vendor, "Msft", 4)) { 1412 switch (vmstor_proto_version) { 1413 case VMSTOR_PROTO_VERSION_WIN8: 1414 case VMSTOR_PROTO_VERSION_WIN8_1: 1415 sdevice->scsi_level = SCSI_SPC_3; 1416 break; 1417 } 1418 1419 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) 1420 sdevice->no_write_same = 0; 1421 } 1422 1423 return 0; 1424 } 1425 1426 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1427 sector_t capacity, int *info) 1428 { 1429 sector_t nsect = capacity; 1430 sector_t cylinders = nsect; 1431 int heads, sectors_pt; 1432 1433 /* 1434 * We are making up these values; let us keep it simple. 1435 */ 1436 heads = 0xff; 1437 sectors_pt = 0x3f; /* Sectors per track */ 1438 sector_div(cylinders, heads * sectors_pt); 1439 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1440 cylinders = 0xffff; 1441 1442 info[0] = heads; 1443 info[1] = sectors_pt; 1444 info[2] = (int)cylinders; 1445 1446 return 0; 1447 } 1448 1449 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1450 { 1451 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1452 struct hv_device *device = host_dev->dev; 1453 1454 struct storvsc_device *stor_device; 1455 struct storvsc_cmd_request *request; 1456 struct vstor_packet *vstor_packet; 1457 int ret, t; 1458 1459 1460 stor_device = get_out_stor_device(device); 1461 if (!stor_device) 1462 return FAILED; 1463 1464 request = &stor_device->reset_request; 1465 vstor_packet = &request->vstor_packet; 1466 1467 init_completion(&request->wait_event); 1468 1469 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1470 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1471 vstor_packet->vm_srb.path_id = stor_device->path_id; 1472 1473 ret = vmbus_sendpacket(device->channel, vstor_packet, 1474 (sizeof(struct vstor_packet) - 1475 vmscsi_size_delta), 1476 (unsigned long)&stor_device->reset_request, 1477 VM_PKT_DATA_INBAND, 1478 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1479 if (ret != 0) 1480 return FAILED; 1481 1482 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1483 if (t == 0) 1484 return TIMEOUT_ERROR; 1485 1486 1487 /* 1488 * At this point, all outstanding requests in the adapter 1489 * should have been flushed out and return to us 1490 * There is a potential race here where the host may be in 1491 * the process of responding when we return from here. 1492 * Just wait for all in-transit packets to be accounted for 1493 * before we return from here. 1494 */ 1495 storvsc_wait_to_drain(stor_device); 1496 1497 return SUCCESS; 1498 } 1499 1500 /* 1501 * The host guarantees to respond to each command, although I/O latencies might 1502 * be unbounded on Azure. Reset the timer unconditionally to give the host a 1503 * chance to perform EH. 1504 */ 1505 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) 1506 { 1507 return BLK_EH_RESET_TIMER; 1508 } 1509 1510 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1511 { 1512 bool allowed = true; 1513 u8 scsi_op = scmnd->cmnd[0]; 1514 1515 switch (scsi_op) { 1516 /* the host does not handle WRITE_SAME, log accident usage */ 1517 case WRITE_SAME: 1518 /* 1519 * smartd sends this command and the host does not handle 1520 * this. So, don't send it. 1521 */ 1522 case SET_WINDOW: 1523 scmnd->result = ILLEGAL_REQUEST << 16; 1524 allowed = false; 1525 break; 1526 default: 1527 break; 1528 } 1529 return allowed; 1530 } 1531 1532 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1533 { 1534 int ret; 1535 struct hv_host_device *host_dev = shost_priv(host); 1536 struct hv_device *dev = host_dev->dev; 1537 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); 1538 int i; 1539 struct scatterlist *sgl; 1540 unsigned int sg_count = 0; 1541 struct vmscsi_request *vm_srb; 1542 struct scatterlist *cur_sgl; 1543 struct vmbus_packet_mpb_array *payload; 1544 u32 payload_sz; 1545 u32 length; 1546 1547 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { 1548 /* 1549 * On legacy hosts filter unimplemented commands. 1550 * Future hosts are expected to correctly handle 1551 * unsupported commands. Furthermore, it is 1552 * possible that some of the currently 1553 * unsupported commands maybe supported in 1554 * future versions of the host. 1555 */ 1556 if (!storvsc_scsi_cmd_ok(scmnd)) { 1557 scmnd->scsi_done(scmnd); 1558 return 0; 1559 } 1560 } 1561 1562 /* Setup the cmd request */ 1563 cmd_request->cmd = scmnd; 1564 1565 vm_srb = &cmd_request->vstor_packet.vm_srb; 1566 vm_srb->win8_extension.time_out_value = 60; 1567 1568 vm_srb->win8_extension.srb_flags |= 1569 SRB_FLAGS_DISABLE_SYNCH_TRANSFER; 1570 1571 if (scmnd->device->tagged_supported) { 1572 vm_srb->win8_extension.srb_flags |= 1573 (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); 1574 vm_srb->win8_extension.queue_tag = SP_UNTAGGED; 1575 vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; 1576 } 1577 1578 /* Build the SRB */ 1579 switch (scmnd->sc_data_direction) { 1580 case DMA_TO_DEVICE: 1581 vm_srb->data_in = WRITE_TYPE; 1582 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1583 break; 1584 case DMA_FROM_DEVICE: 1585 vm_srb->data_in = READ_TYPE; 1586 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1587 break; 1588 case DMA_NONE: 1589 vm_srb->data_in = UNKNOWN_TYPE; 1590 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; 1591 break; 1592 default: 1593 /* 1594 * This is DMA_BIDIRECTIONAL or something else we are never 1595 * supposed to see here. 1596 */ 1597 WARN(1, "Unexpected data direction: %d\n", 1598 scmnd->sc_data_direction); 1599 return -EINVAL; 1600 } 1601 1602 1603 vm_srb->port_number = host_dev->port; 1604 vm_srb->path_id = scmnd->device->channel; 1605 vm_srb->target_id = scmnd->device->id; 1606 vm_srb->lun = scmnd->device->lun; 1607 1608 vm_srb->cdb_length = scmnd->cmd_len; 1609 1610 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1611 1612 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1613 sg_count = scsi_sg_count(scmnd); 1614 1615 length = scsi_bufflen(scmnd); 1616 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; 1617 payload_sz = sizeof(cmd_request->mpb); 1618 1619 if (sg_count) { 1620 if (sg_count > MAX_PAGE_BUFFER_COUNT) { 1621 1622 payload_sz = (sg_count * sizeof(u64) + 1623 sizeof(struct vmbus_packet_mpb_array)); 1624 payload = kzalloc(payload_sz, GFP_ATOMIC); 1625 if (!payload) 1626 return SCSI_MLQUEUE_DEVICE_BUSY; 1627 } 1628 1629 payload->range.len = length; 1630 payload->range.offset = sgl[0].offset; 1631 1632 cur_sgl = sgl; 1633 for (i = 0; i < sg_count; i++) { 1634 payload->range.pfn_array[i] = 1635 page_to_pfn(sg_page((cur_sgl))); 1636 cur_sgl = sg_next(cur_sgl); 1637 } 1638 } 1639 1640 cmd_request->payload = payload; 1641 cmd_request->payload_sz = payload_sz; 1642 1643 /* Invokes the vsc to start an IO */ 1644 ret = storvsc_do_io(dev, cmd_request, get_cpu()); 1645 put_cpu(); 1646 1647 if (ret == -EAGAIN) { 1648 /* no more space */ 1649 return SCSI_MLQUEUE_DEVICE_BUSY; 1650 } 1651 1652 return 0; 1653 } 1654 1655 static struct scsi_host_template scsi_driver = { 1656 .module = THIS_MODULE, 1657 .name = "storvsc_host_t", 1658 .cmd_size = sizeof(struct storvsc_cmd_request), 1659 .bios_param = storvsc_get_chs, 1660 .queuecommand = storvsc_queuecommand, 1661 .eh_host_reset_handler = storvsc_host_reset_handler, 1662 .proc_name = "storvsc_host", 1663 .eh_timed_out = storvsc_eh_timed_out, 1664 .slave_configure = storvsc_device_configure, 1665 .cmd_per_lun = 255, 1666 .this_id = -1, 1667 .use_clustering = ENABLE_CLUSTERING, 1668 /* Make sure we dont get a sg segment crosses a page boundary */ 1669 .dma_boundary = PAGE_SIZE-1, 1670 .no_write_same = 1, 1671 .track_queue_depth = 1, 1672 }; 1673 1674 enum { 1675 SCSI_GUID, 1676 IDE_GUID, 1677 SFC_GUID, 1678 }; 1679 1680 static const struct hv_vmbus_device_id id_table[] = { 1681 /* SCSI guid */ 1682 { HV_SCSI_GUID, 1683 .driver_data = SCSI_GUID 1684 }, 1685 /* IDE guid */ 1686 { HV_IDE_GUID, 1687 .driver_data = IDE_GUID 1688 }, 1689 /* Fibre Channel GUID */ 1690 { 1691 HV_SYNTHFC_GUID, 1692 .driver_data = SFC_GUID 1693 }, 1694 { }, 1695 }; 1696 1697 MODULE_DEVICE_TABLE(vmbus, id_table); 1698 1699 static int storvsc_probe(struct hv_device *device, 1700 const struct hv_vmbus_device_id *dev_id) 1701 { 1702 int ret; 1703 int num_cpus = num_online_cpus(); 1704 struct Scsi_Host *host; 1705 struct hv_host_device *host_dev; 1706 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1707 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); 1708 int target = 0; 1709 struct storvsc_device *stor_device; 1710 int max_luns_per_target; 1711 int max_targets; 1712 int max_channels; 1713 int max_sub_channels = 0; 1714 1715 /* 1716 * Based on the windows host we are running on, 1717 * set state to properly communicate with the host. 1718 */ 1719 1720 if (vmbus_proto_version < VERSION_WIN8) { 1721 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1722 max_targets = STORVSC_IDE_MAX_TARGETS; 1723 max_channels = STORVSC_IDE_MAX_CHANNELS; 1724 } else { 1725 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; 1726 max_targets = STORVSC_MAX_TARGETS; 1727 max_channels = STORVSC_MAX_CHANNELS; 1728 /* 1729 * On Windows8 and above, we support sub-channels for storage. 1730 * The number of sub-channels offerred is based on the number of 1731 * VCPUs in the guest. 1732 */ 1733 max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); 1734 } 1735 1736 scsi_driver.can_queue = (max_outstanding_req_per_channel * 1737 (max_sub_channels + 1)); 1738 1739 host = scsi_host_alloc(&scsi_driver, 1740 sizeof(struct hv_host_device)); 1741 if (!host) 1742 return -ENOMEM; 1743 1744 host_dev = shost_priv(host); 1745 memset(host_dev, 0, sizeof(struct hv_host_device)); 1746 1747 host_dev->port = host->host_no; 1748 host_dev->dev = device; 1749 1750 1751 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1752 if (!stor_device) { 1753 ret = -ENOMEM; 1754 goto err_out0; 1755 } 1756 1757 stor_device->destroy = false; 1758 stor_device->open_sub_channel = false; 1759 init_waitqueue_head(&stor_device->waiting_to_drain); 1760 stor_device->device = device; 1761 stor_device->host = host; 1762 hv_set_drvdata(device, stor_device); 1763 1764 stor_device->port_number = host->host_no; 1765 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); 1766 if (ret) 1767 goto err_out1; 1768 1769 host_dev->path = stor_device->path_id; 1770 host_dev->target = stor_device->target_id; 1771 1772 switch (dev_id->driver_data) { 1773 case SFC_GUID: 1774 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; 1775 host->max_id = STORVSC_FC_MAX_TARGETS; 1776 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; 1777 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1778 host->transportt = fc_transport_template; 1779 #endif 1780 break; 1781 1782 case SCSI_GUID: 1783 host->max_lun = max_luns_per_target; 1784 host->max_id = max_targets; 1785 host->max_channel = max_channels - 1; 1786 break; 1787 1788 default: 1789 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1790 host->max_id = STORVSC_IDE_MAX_TARGETS; 1791 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; 1792 break; 1793 } 1794 /* max cmd length */ 1795 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1796 1797 /* 1798 * set the table size based on the info we got 1799 * from the host. 1800 */ 1801 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); 1802 /* 1803 * Set the number of HW queues we are supporting. 1804 */ 1805 if (stor_device->num_sc != 0) 1806 host->nr_hw_queues = stor_device->num_sc + 1; 1807 1808 /* Register the HBA and start the scsi bus scan */ 1809 ret = scsi_add_host(host, &device->device); 1810 if (ret != 0) 1811 goto err_out2; 1812 1813 if (!dev_is_ide) { 1814 scsi_scan_host(host); 1815 } else { 1816 target = (device->dev_instance.b[5] << 8 | 1817 device->dev_instance.b[4]); 1818 ret = scsi_add_device(host, 0, target, 0); 1819 if (ret) { 1820 scsi_remove_host(host); 1821 goto err_out2; 1822 } 1823 } 1824 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1825 if (host->transportt == fc_transport_template) { 1826 fc_host_node_name(host) = stor_device->node_name; 1827 fc_host_port_name(host) = stor_device->port_name; 1828 } 1829 #endif 1830 return 0; 1831 1832 err_out2: 1833 /* 1834 * Once we have connected with the host, we would need to 1835 * to invoke storvsc_dev_remove() to rollback this state and 1836 * this call also frees up the stor_device; hence the jump around 1837 * err_out1 label. 1838 */ 1839 storvsc_dev_remove(device); 1840 goto err_out0; 1841 1842 err_out1: 1843 kfree(stor_device->stor_chns); 1844 kfree(stor_device); 1845 1846 err_out0: 1847 scsi_host_put(host); 1848 return ret; 1849 } 1850 1851 static int storvsc_remove(struct hv_device *dev) 1852 { 1853 struct storvsc_device *stor_device = hv_get_drvdata(dev); 1854 struct Scsi_Host *host = stor_device->host; 1855 1856 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1857 if (host->transportt == fc_transport_template) 1858 fc_remove_host(host); 1859 #endif 1860 scsi_remove_host(host); 1861 storvsc_dev_remove(dev); 1862 scsi_host_put(host); 1863 1864 return 0; 1865 } 1866 1867 static struct hv_driver storvsc_drv = { 1868 .name = KBUILD_MODNAME, 1869 .id_table = id_table, 1870 .probe = storvsc_probe, 1871 .remove = storvsc_remove, 1872 }; 1873 1874 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1875 static struct fc_function_template fc_transport_functions = { 1876 .show_host_node_name = 1, 1877 .show_host_port_name = 1, 1878 }; 1879 #endif 1880 1881 static int __init storvsc_drv_init(void) 1882 { 1883 int ret; 1884 1885 /* 1886 * Divide the ring buffer data size (which is 1 page less 1887 * than the ring buffer size since that page is reserved for 1888 * the ring buffer indices) by the max request size (which is 1889 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 1890 */ 1891 max_outstanding_req_per_channel = 1892 ((storvsc_ringbuffer_size - PAGE_SIZE) / 1893 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 1894 sizeof(struct vstor_packet) + sizeof(u64) - 1895 vmscsi_size_delta, 1896 sizeof(u64))); 1897 1898 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1899 fc_transport_template = fc_attach_transport(&fc_transport_functions); 1900 if (!fc_transport_template) 1901 return -ENODEV; 1902 #endif 1903 1904 ret = vmbus_driver_register(&storvsc_drv); 1905 1906 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1907 if (ret) 1908 fc_release_transport(fc_transport_template); 1909 #endif 1910 1911 return ret; 1912 } 1913 1914 static void __exit storvsc_drv_exit(void) 1915 { 1916 vmbus_driver_unregister(&storvsc_drv); 1917 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1918 fc_release_transport(fc_transport_template); 1919 #endif 1920 } 1921 1922 MODULE_LICENSE("GPL"); 1923 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 1924 module_init(storvsc_drv_init); 1925 module_exit(storvsc_drv_exit); 1926