1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2009, Microsoft Corporation. 4 * 5 * Authors: 6 * Haiyang Zhang <haiyangz@microsoft.com> 7 * Hank Janssen <hjanssen@microsoft.com> 8 * K. Y. Srinivasan <kys@microsoft.com> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/wait.h> 13 #include <linux/sched.h> 14 #include <linux/completion.h> 15 #include <linux/string.h> 16 #include <linux/mm.h> 17 #include <linux/delay.h> 18 #include <linux/init.h> 19 #include <linux/slab.h> 20 #include <linux/module.h> 21 #include <linux/device.h> 22 #include <linux/hyperv.h> 23 #include <linux/blkdev.h> 24 #include <scsi/scsi.h> 25 #include <scsi/scsi_cmnd.h> 26 #include <scsi/scsi_host.h> 27 #include <scsi/scsi_device.h> 28 #include <scsi/scsi_tcq.h> 29 #include <scsi/scsi_eh.h> 30 #include <scsi/scsi_devinfo.h> 31 #include <scsi/scsi_dbg.h> 32 #include <scsi/scsi_transport_fc.h> 33 #include <scsi/scsi_transport.h> 34 35 /* 36 * All wire protocol details (storage protocol between the guest and the host) 37 * are consolidated here. 38 * 39 * Begin protocol definitions. 40 */ 41 42 /* 43 * Version history: 44 * V1 Beta: 0.1 45 * V1 RC < 2008/1/31: 1.0 46 * V1 RC > 2008/1/31: 2.0 47 * Win7: 4.2 48 * Win8: 5.1 49 * Win8.1: 6.0 50 * Win10: 6.2 51 */ 52 53 #define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \ 54 (((MINOR_) & 0xff))) 55 56 #define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0) 57 #define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2) 58 #define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1) 59 #define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0) 60 #define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2) 61 62 /* Packet structure describing virtual storage requests. */ 63 enum vstor_packet_operation { 64 VSTOR_OPERATION_COMPLETE_IO = 1, 65 VSTOR_OPERATION_REMOVE_DEVICE = 2, 66 VSTOR_OPERATION_EXECUTE_SRB = 3, 67 VSTOR_OPERATION_RESET_LUN = 4, 68 VSTOR_OPERATION_RESET_ADAPTER = 5, 69 VSTOR_OPERATION_RESET_BUS = 6, 70 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, 71 VSTOR_OPERATION_END_INITIALIZATION = 8, 72 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, 73 VSTOR_OPERATION_QUERY_PROPERTIES = 10, 74 VSTOR_OPERATION_ENUMERATE_BUS = 11, 75 VSTOR_OPERATION_FCHBA_DATA = 12, 76 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, 77 VSTOR_OPERATION_MAXIMUM = 13 78 }; 79 80 /* 81 * WWN packet for Fibre Channel HBA 82 */ 83 84 struct hv_fc_wwn_packet { 85 u8 primary_active; 86 u8 reserved1[3]; 87 u8 primary_port_wwn[8]; 88 u8 primary_node_wwn[8]; 89 u8 secondary_port_wwn[8]; 90 u8 secondary_node_wwn[8]; 91 }; 92 93 94 95 /* 96 * SRB Flag Bits 97 */ 98 99 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 100 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 101 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 102 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 103 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 104 #define SRB_FLAGS_DATA_IN 0x00000040 105 #define SRB_FLAGS_DATA_OUT 0x00000080 106 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 107 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) 108 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 109 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 110 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 111 112 /* 113 * This flag indicates the request is part of the workflow for processing a D3. 114 */ 115 #define SRB_FLAGS_D3_PROCESSING 0x00000800 116 #define SRB_FLAGS_IS_ACTIVE 0x00010000 117 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 118 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 119 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 120 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 121 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 122 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 123 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 124 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 125 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 126 127 #define SP_UNTAGGED ((unsigned char) ~0) 128 #define SRB_SIMPLE_TAG_REQUEST 0x20 129 130 /* 131 * Platform neutral description of a scsi request - 132 * this remains the same across the write regardless of 32/64 bit 133 * note: it's patterned off the SCSI_PASS_THROUGH structure 134 */ 135 #define STORVSC_MAX_CMD_LEN 0x10 136 137 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 138 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 139 140 #define STORVSC_SENSE_BUFFER_SIZE 0x14 141 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 142 143 /* 144 * Sense buffer size changed in win8; have a run-time 145 * variable to track the size we should use. This value will 146 * likely change during protocol negotiation but it is valid 147 * to start by assuming pre-Win8. 148 */ 149 static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; 150 151 /* 152 * The storage protocol version is determined during the 153 * initial exchange with the host. It will indicate which 154 * storage functionality is available in the host. 155 */ 156 static int vmstor_proto_version; 157 158 #define STORVSC_LOGGING_NONE 0 159 #define STORVSC_LOGGING_ERROR 1 160 #define STORVSC_LOGGING_WARN 2 161 162 static int logging_level = STORVSC_LOGGING_ERROR; 163 module_param(logging_level, int, S_IRUGO|S_IWUSR); 164 MODULE_PARM_DESC(logging_level, 165 "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); 166 167 static inline bool do_logging(int level) 168 { 169 return logging_level >= level; 170 } 171 172 #define storvsc_log(dev, level, fmt, ...) \ 173 do { \ 174 if (do_logging(level)) \ 175 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ 176 } while (0) 177 178 struct vmscsi_win8_extension { 179 /* 180 * The following were added in Windows 8 181 */ 182 u16 reserve; 183 u8 queue_tag; 184 u8 queue_action; 185 u32 srb_flags; 186 u32 time_out_value; 187 u32 queue_sort_ey; 188 } __packed; 189 190 struct vmscsi_request { 191 u16 length; 192 u8 srb_status; 193 u8 scsi_status; 194 195 u8 port_number; 196 u8 path_id; 197 u8 target_id; 198 u8 lun; 199 200 u8 cdb_length; 201 u8 sense_info_length; 202 u8 data_in; 203 u8 reserved; 204 205 u32 data_transfer_length; 206 207 union { 208 u8 cdb[STORVSC_MAX_CMD_LEN]; 209 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; 210 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; 211 }; 212 /* 213 * The following was added in win8. 214 */ 215 struct vmscsi_win8_extension win8_extension; 216 217 } __attribute((packed)); 218 219 220 /* 221 * The size of the vmscsi_request has changed in win8. The 222 * additional size is because of new elements added to the 223 * structure. These elements are valid only when we are talking 224 * to a win8 host. 225 * Track the correction to size we need to apply. This value 226 * will likely change during protocol negotiation but it is 227 * valid to start by assuming pre-Win8. 228 */ 229 static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 230 231 /* 232 * The list of storage protocols in order of preference. 233 */ 234 struct vmstor_protocol { 235 int protocol_version; 236 int sense_buffer_size; 237 int vmscsi_size_delta; 238 }; 239 240 241 static const struct vmstor_protocol vmstor_protocols[] = { 242 { 243 VMSTOR_PROTO_VERSION_WIN10, 244 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 245 0 246 }, 247 { 248 VMSTOR_PROTO_VERSION_WIN8_1, 249 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 250 0 251 }, 252 { 253 VMSTOR_PROTO_VERSION_WIN8, 254 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 255 0 256 }, 257 { 258 VMSTOR_PROTO_VERSION_WIN7, 259 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 260 sizeof(struct vmscsi_win8_extension), 261 }, 262 { 263 VMSTOR_PROTO_VERSION_WIN6, 264 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 265 sizeof(struct vmscsi_win8_extension), 266 } 267 }; 268 269 270 /* 271 * This structure is sent during the initialization phase to get the different 272 * properties of the channel. 273 */ 274 275 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 276 277 struct vmstorage_channel_properties { 278 u32 reserved; 279 u16 max_channel_cnt; 280 u16 reserved1; 281 282 u32 flags; 283 u32 max_transfer_bytes; 284 285 u64 reserved2; 286 } __packed; 287 288 /* This structure is sent during the storage protocol negotiations. */ 289 struct vmstorage_protocol_version { 290 /* Major (MSW) and minor (LSW) version numbers. */ 291 u16 major_minor; 292 293 /* 294 * Revision number is auto-incremented whenever this file is changed 295 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 296 * definitely indicate incompatibility--but it does indicate mismatched 297 * builds. 298 * This is only used on the windows side. Just set it to 0. 299 */ 300 u16 revision; 301 } __packed; 302 303 /* Channel Property Flags */ 304 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 305 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 306 307 struct vstor_packet { 308 /* Requested operation type */ 309 enum vstor_packet_operation operation; 310 311 /* Flags - see below for values */ 312 u32 flags; 313 314 /* Status of the request returned from the server side. */ 315 u32 status; 316 317 /* Data payload area */ 318 union { 319 /* 320 * Structure used to forward SCSI commands from the 321 * client to the server. 322 */ 323 struct vmscsi_request vm_srb; 324 325 /* Structure used to query channel properties. */ 326 struct vmstorage_channel_properties storage_channel_properties; 327 328 /* Used during version negotiations. */ 329 struct vmstorage_protocol_version version; 330 331 /* Fibre channel address packet */ 332 struct hv_fc_wwn_packet wwn_packet; 333 334 /* Number of sub-channels to create */ 335 u16 sub_channel_count; 336 337 /* This will be the maximum of the union members */ 338 u8 buffer[0x34]; 339 }; 340 } __packed; 341 342 /* 343 * Packet Flags: 344 * 345 * This flag indicates that the server should send back a completion for this 346 * packet. 347 */ 348 349 #define REQUEST_COMPLETION_FLAG 0x1 350 351 /* Matches Windows-end */ 352 enum storvsc_request_type { 353 WRITE_TYPE = 0, 354 READ_TYPE, 355 UNKNOWN_TYPE, 356 }; 357 358 /* 359 * SRB status codes and masks; a subset of the codes used here. 360 */ 361 362 #define SRB_STATUS_AUTOSENSE_VALID 0x80 363 #define SRB_STATUS_QUEUE_FROZEN 0x40 364 #define SRB_STATUS_INVALID_LUN 0x20 365 #define SRB_STATUS_SUCCESS 0x01 366 #define SRB_STATUS_ABORTED 0x02 367 #define SRB_STATUS_ERROR 0x04 368 #define SRB_STATUS_DATA_OVERRUN 0x12 369 370 #define SRB_STATUS(status) \ 371 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) 372 /* 373 * This is the end of Protocol specific defines. 374 */ 375 376 static int storvsc_ringbuffer_size = (128 * 1024); 377 static u32 max_outstanding_req_per_channel; 378 static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth); 379 380 static int storvsc_vcpus_per_sub_channel = 4; 381 382 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 383 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 384 385 module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); 386 MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); 387 388 static int ring_avail_percent_lowater = 10; 389 module_param(ring_avail_percent_lowater, int, S_IRUGO); 390 MODULE_PARM_DESC(ring_avail_percent_lowater, 391 "Select a channel if available ring size > this in percent"); 392 393 /* 394 * Timeout in seconds for all devices managed by this driver. 395 */ 396 static int storvsc_timeout = 180; 397 398 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 399 static struct scsi_transport_template *fc_transport_template; 400 #endif 401 402 static void storvsc_on_channel_callback(void *context); 403 404 #define STORVSC_MAX_LUNS_PER_TARGET 255 405 #define STORVSC_MAX_TARGETS 2 406 #define STORVSC_MAX_CHANNELS 8 407 408 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 409 #define STORVSC_FC_MAX_TARGETS 128 410 #define STORVSC_FC_MAX_CHANNELS 8 411 412 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 413 #define STORVSC_IDE_MAX_TARGETS 1 414 #define STORVSC_IDE_MAX_CHANNELS 1 415 416 struct storvsc_cmd_request { 417 struct scsi_cmnd *cmd; 418 419 struct hv_device *device; 420 421 /* Synchronize the request/response if needed */ 422 struct completion wait_event; 423 424 struct vmbus_channel_packet_multipage_buffer mpb; 425 struct vmbus_packet_mpb_array *payload; 426 u32 payload_sz; 427 428 struct vstor_packet vstor_packet; 429 }; 430 431 432 /* A storvsc device is a device object that contains a vmbus channel */ 433 struct storvsc_device { 434 struct hv_device *device; 435 436 bool destroy; 437 bool drain_notify; 438 atomic_t num_outstanding_req; 439 struct Scsi_Host *host; 440 441 wait_queue_head_t waiting_to_drain; 442 443 /* 444 * Each unique Port/Path/Target represents 1 channel ie scsi 445 * controller. In reality, the pathid, targetid is always 0 446 * and the port is set by us 447 */ 448 unsigned int port_number; 449 unsigned char path_id; 450 unsigned char target_id; 451 452 /* 453 * Max I/O, the device can support. 454 */ 455 u32 max_transfer_bytes; 456 /* 457 * Number of sub-channels we will open. 458 */ 459 u16 num_sc; 460 struct vmbus_channel **stor_chns; 461 /* 462 * Mask of CPUs bound to subchannels. 463 */ 464 struct cpumask alloced_cpus; 465 /* 466 * Serializes modifications of stor_chns[] from storvsc_do_io() 467 * and storvsc_change_target_cpu(). 468 */ 469 spinlock_t lock; 470 /* Used for vsc/vsp channel reset process */ 471 struct storvsc_cmd_request init_request; 472 struct storvsc_cmd_request reset_request; 473 /* 474 * Currently active port and node names for FC devices. 475 */ 476 u64 node_name; 477 u64 port_name; 478 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 479 struct fc_rport *rport; 480 #endif 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 struct workqueue_struct *handle_error_wq; 489 struct work_struct host_scan_work; 490 struct Scsi_Host *host; 491 }; 492 493 struct storvsc_scan_work { 494 struct work_struct work; 495 struct Scsi_Host *host; 496 u8 lun; 497 u8 tgt_id; 498 }; 499 500 static void storvsc_device_scan(struct work_struct *work) 501 { 502 struct storvsc_scan_work *wrk; 503 struct scsi_device *sdev; 504 505 wrk = container_of(work, struct storvsc_scan_work, work); 506 507 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); 508 if (!sdev) 509 goto done; 510 scsi_rescan_device(&sdev->sdev_gendev); 511 scsi_device_put(sdev); 512 513 done: 514 kfree(wrk); 515 } 516 517 static void storvsc_host_scan(struct work_struct *work) 518 { 519 struct Scsi_Host *host; 520 struct scsi_device *sdev; 521 struct hv_host_device *host_device = 522 container_of(work, struct hv_host_device, host_scan_work); 523 524 host = host_device->host; 525 /* 526 * Before scanning the host, first check to see if any of the 527 * currrently known devices have been hot removed. We issue a 528 * "unit ready" command against all currently known devices. 529 * This I/O will result in an error for devices that have been 530 * removed. As part of handling the I/O error, we remove the device. 531 * 532 * When a LUN is added or removed, the host sends us a signal to 533 * scan the host. Thus we are forced to discover the LUNs that 534 * may have been removed this way. 535 */ 536 mutex_lock(&host->scan_mutex); 537 shost_for_each_device(sdev, host) 538 scsi_test_unit_ready(sdev, 1, 1, NULL); 539 mutex_unlock(&host->scan_mutex); 540 /* 541 * Now scan the host to discover LUNs that may have been added. 542 */ 543 scsi_scan_host(host); 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 storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old, 630 u32 new) 631 { 632 struct storvsc_device *stor_device; 633 struct vmbus_channel *cur_chn; 634 bool old_is_alloced = false; 635 struct hv_device *device; 636 unsigned long flags; 637 int cpu; 638 639 device = channel->primary_channel ? 640 channel->primary_channel->device_obj 641 : channel->device_obj; 642 stor_device = get_out_stor_device(device); 643 if (!stor_device) 644 return; 645 646 /* See storvsc_do_io() -> get_og_chn(). */ 647 spin_lock_irqsave(&stor_device->lock, flags); 648 649 /* 650 * Determines if the storvsc device has other channels assigned to 651 * the "old" CPU to update the alloced_cpus mask and the stor_chns 652 * array. 653 */ 654 if (device->channel != channel && device->channel->target_cpu == old) { 655 cur_chn = device->channel; 656 old_is_alloced = true; 657 goto old_is_alloced; 658 } 659 list_for_each_entry(cur_chn, &device->channel->sc_list, sc_list) { 660 if (cur_chn == channel) 661 continue; 662 if (cur_chn->target_cpu == old) { 663 old_is_alloced = true; 664 goto old_is_alloced; 665 } 666 } 667 668 old_is_alloced: 669 if (old_is_alloced) 670 WRITE_ONCE(stor_device->stor_chns[old], cur_chn); 671 else 672 cpumask_clear_cpu(old, &stor_device->alloced_cpus); 673 674 /* "Flush" the stor_chns array. */ 675 for_each_possible_cpu(cpu) { 676 if (stor_device->stor_chns[cpu] && !cpumask_test_cpu( 677 cpu, &stor_device->alloced_cpus)) 678 WRITE_ONCE(stor_device->stor_chns[cpu], NULL); 679 } 680 681 WRITE_ONCE(stor_device->stor_chns[new], channel); 682 cpumask_set_cpu(new, &stor_device->alloced_cpus); 683 684 spin_unlock_irqrestore(&stor_device->lock, flags); 685 } 686 687 static void handle_sc_creation(struct vmbus_channel *new_sc) 688 { 689 struct hv_device *device = new_sc->primary_channel->device_obj; 690 struct device *dev = &device->device; 691 struct storvsc_device *stor_device; 692 struct vmstorage_channel_properties props; 693 int ret; 694 695 stor_device = get_out_stor_device(device); 696 if (!stor_device) 697 return; 698 699 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 700 701 ret = vmbus_open(new_sc, 702 storvsc_ringbuffer_size, 703 storvsc_ringbuffer_size, 704 (void *)&props, 705 sizeof(struct vmstorage_channel_properties), 706 storvsc_on_channel_callback, new_sc); 707 708 /* In case vmbus_open() fails, we don't use the sub-channel. */ 709 if (ret != 0) { 710 dev_err(dev, "Failed to open sub-channel: err=%d\n", ret); 711 return; 712 } 713 714 new_sc->change_target_cpu_callback = storvsc_change_target_cpu; 715 716 /* Add the sub-channel to the array of available channels. */ 717 stor_device->stor_chns[new_sc->target_cpu] = new_sc; 718 cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); 719 } 720 721 static void handle_multichannel_storage(struct hv_device *device, int max_chns) 722 { 723 struct device *dev = &device->device; 724 struct storvsc_device *stor_device; 725 int num_sc; 726 struct storvsc_cmd_request *request; 727 struct vstor_packet *vstor_packet; 728 int ret, t; 729 730 /* 731 * If the number of CPUs is artificially restricted, such as 732 * with maxcpus=1 on the kernel boot line, Hyper-V could offer 733 * sub-channels >= the number of CPUs. These sub-channels 734 * should not be created. The primary channel is already created 735 * and assigned to one CPU, so check against # CPUs - 1. 736 */ 737 num_sc = min((int)(num_online_cpus() - 1), max_chns); 738 if (!num_sc) 739 return; 740 741 stor_device = get_out_stor_device(device); 742 if (!stor_device) 743 return; 744 745 stor_device->num_sc = num_sc; 746 request = &stor_device->init_request; 747 vstor_packet = &request->vstor_packet; 748 749 /* 750 * Establish a handler for dealing with subchannels. 751 */ 752 vmbus_set_sc_create_callback(device->channel, handle_sc_creation); 753 754 /* 755 * Request the host to create sub-channels. 756 */ 757 memset(request, 0, sizeof(struct storvsc_cmd_request)); 758 init_completion(&request->wait_event); 759 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; 760 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 761 vstor_packet->sub_channel_count = num_sc; 762 763 ret = vmbus_sendpacket(device->channel, vstor_packet, 764 (sizeof(struct vstor_packet) - 765 vmscsi_size_delta), 766 (unsigned long)request, 767 VM_PKT_DATA_INBAND, 768 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 769 770 if (ret != 0) { 771 dev_err(dev, "Failed to create sub-channel: err=%d\n", ret); 772 return; 773 } 774 775 t = wait_for_completion_timeout(&request->wait_event, 10*HZ); 776 if (t == 0) { 777 dev_err(dev, "Failed to create sub-channel: timed out\n"); 778 return; 779 } 780 781 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 782 vstor_packet->status != 0) { 783 dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n", 784 vstor_packet->operation, vstor_packet->status); 785 return; 786 } 787 788 /* 789 * We need to do nothing here, because vmbus_process_offer() 790 * invokes channel->sc_creation_callback, which will open and use 791 * the sub-channel(s). 792 */ 793 } 794 795 static void cache_wwn(struct storvsc_device *stor_device, 796 struct vstor_packet *vstor_packet) 797 { 798 /* 799 * Cache the currently active port and node ww names. 800 */ 801 if (vstor_packet->wwn_packet.primary_active) { 802 stor_device->node_name = 803 wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); 804 stor_device->port_name = 805 wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); 806 } else { 807 stor_device->node_name = 808 wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); 809 stor_device->port_name = 810 wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); 811 } 812 } 813 814 815 static int storvsc_execute_vstor_op(struct hv_device *device, 816 struct storvsc_cmd_request *request, 817 bool status_check) 818 { 819 struct vstor_packet *vstor_packet; 820 int ret, t; 821 822 vstor_packet = &request->vstor_packet; 823 824 init_completion(&request->wait_event); 825 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 826 827 ret = vmbus_sendpacket(device->channel, vstor_packet, 828 (sizeof(struct vstor_packet) - 829 vmscsi_size_delta), 830 (unsigned long)request, 831 VM_PKT_DATA_INBAND, 832 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 833 if (ret != 0) 834 return ret; 835 836 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 837 if (t == 0) 838 return -ETIMEDOUT; 839 840 if (!status_check) 841 return ret; 842 843 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 844 vstor_packet->status != 0) 845 return -EINVAL; 846 847 return ret; 848 } 849 850 static int storvsc_channel_init(struct hv_device *device, bool is_fc) 851 { 852 struct storvsc_device *stor_device; 853 struct storvsc_cmd_request *request; 854 struct vstor_packet *vstor_packet; 855 int ret, i; 856 int max_chns; 857 bool process_sub_channels = false; 858 859 stor_device = get_out_stor_device(device); 860 if (!stor_device) 861 return -ENODEV; 862 863 request = &stor_device->init_request; 864 vstor_packet = &request->vstor_packet; 865 866 /* 867 * Now, initiate the vsc/vsp initialization protocol on the open 868 * channel 869 */ 870 memset(request, 0, sizeof(struct storvsc_cmd_request)); 871 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 872 ret = storvsc_execute_vstor_op(device, request, true); 873 if (ret) 874 return ret; 875 /* 876 * Query host supported protocol version. 877 */ 878 879 for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { 880 /* reuse the packet for version range supported */ 881 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 882 vstor_packet->operation = 883 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 884 885 vstor_packet->version.major_minor = 886 vmstor_protocols[i].protocol_version; 887 888 /* 889 * The revision number is only used in Windows; set it to 0. 890 */ 891 vstor_packet->version.revision = 0; 892 ret = storvsc_execute_vstor_op(device, request, false); 893 if (ret != 0) 894 return ret; 895 896 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) 897 return -EINVAL; 898 899 if (vstor_packet->status == 0) { 900 vmstor_proto_version = 901 vmstor_protocols[i].protocol_version; 902 903 sense_buffer_size = 904 vmstor_protocols[i].sense_buffer_size; 905 906 vmscsi_size_delta = 907 vmstor_protocols[i].vmscsi_size_delta; 908 909 break; 910 } 911 } 912 913 if (vstor_packet->status != 0) 914 return -EINVAL; 915 916 917 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 918 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 919 ret = storvsc_execute_vstor_op(device, request, true); 920 if (ret != 0) 921 return ret; 922 923 /* 924 * Check to see if multi-channel support is there. 925 * Hosts that implement protocol version of 5.1 and above 926 * support multi-channel. 927 */ 928 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; 929 930 /* 931 * Allocate state to manage the sub-channels. 932 * We allocate an array based on the numbers of possible CPUs 933 * (Hyper-V does not support cpu online/offline). 934 * This Array will be sparseley populated with unique 935 * channels - primary + sub-channels. 936 * We will however populate all the slots to evenly distribute 937 * the load. 938 */ 939 stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), 940 GFP_KERNEL); 941 if (stor_device->stor_chns == NULL) 942 return -ENOMEM; 943 944 device->channel->change_target_cpu_callback = storvsc_change_target_cpu; 945 946 stor_device->stor_chns[device->channel->target_cpu] = device->channel; 947 cpumask_set_cpu(device->channel->target_cpu, 948 &stor_device->alloced_cpus); 949 950 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { 951 if (vstor_packet->storage_channel_properties.flags & 952 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) 953 process_sub_channels = true; 954 } 955 stor_device->max_transfer_bytes = 956 vstor_packet->storage_channel_properties.max_transfer_bytes; 957 958 if (!is_fc) 959 goto done; 960 961 /* 962 * For FC devices retrieve FC HBA data. 963 */ 964 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 965 vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; 966 ret = storvsc_execute_vstor_op(device, request, true); 967 if (ret != 0) 968 return ret; 969 970 /* 971 * Cache the currently active port and node ww names. 972 */ 973 cache_wwn(stor_device, vstor_packet); 974 975 done: 976 977 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 978 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 979 ret = storvsc_execute_vstor_op(device, request, true); 980 if (ret != 0) 981 return ret; 982 983 if (process_sub_channels) 984 handle_multichannel_storage(device, max_chns); 985 986 return ret; 987 } 988 989 static void storvsc_handle_error(struct vmscsi_request *vm_srb, 990 struct scsi_cmnd *scmnd, 991 struct Scsi_Host *host, 992 u8 asc, u8 ascq) 993 { 994 struct storvsc_scan_work *wrk; 995 void (*process_err_fn)(struct work_struct *work); 996 struct hv_host_device *host_dev = shost_priv(host); 997 bool do_work = false; 998 999 switch (SRB_STATUS(vm_srb->srb_status)) { 1000 case SRB_STATUS_ERROR: 1001 /* 1002 * Let upper layer deal with error when 1003 * sense message is present. 1004 */ 1005 1006 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) 1007 break; 1008 /* 1009 * If there is an error; offline the device since all 1010 * error recovery strategies would have already been 1011 * deployed on the host side. However, if the command 1012 * were a pass-through command deal with it appropriately. 1013 */ 1014 switch (scmnd->cmnd[0]) { 1015 case ATA_16: 1016 case ATA_12: 1017 set_host_byte(scmnd, DID_PASSTHROUGH); 1018 break; 1019 /* 1020 * On Some Windows hosts TEST_UNIT_READY command can return 1021 * SRB_STATUS_ERROR, let the upper level code deal with it 1022 * based on the sense information. 1023 */ 1024 case TEST_UNIT_READY: 1025 break; 1026 default: 1027 set_host_byte(scmnd, DID_ERROR); 1028 } 1029 break; 1030 case SRB_STATUS_INVALID_LUN: 1031 set_host_byte(scmnd, DID_NO_CONNECT); 1032 do_work = true; 1033 process_err_fn = storvsc_remove_lun; 1034 break; 1035 case SRB_STATUS_ABORTED: 1036 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && 1037 (asc == 0x2a) && (ascq == 0x9)) { 1038 do_work = true; 1039 process_err_fn = storvsc_device_scan; 1040 /* 1041 * Retry the I/O that triggered this. 1042 */ 1043 set_host_byte(scmnd, DID_REQUEUE); 1044 } 1045 break; 1046 } 1047 1048 if (!do_work) 1049 return; 1050 1051 /* 1052 * We need to schedule work to process this error; schedule it. 1053 */ 1054 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1055 if (!wrk) { 1056 set_host_byte(scmnd, DID_TARGET_FAILURE); 1057 return; 1058 } 1059 1060 wrk->host = host; 1061 wrk->lun = vm_srb->lun; 1062 wrk->tgt_id = vm_srb->target_id; 1063 INIT_WORK(&wrk->work, process_err_fn); 1064 queue_work(host_dev->handle_error_wq, &wrk->work); 1065 } 1066 1067 1068 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, 1069 struct storvsc_device *stor_dev) 1070 { 1071 struct scsi_cmnd *scmnd = cmd_request->cmd; 1072 struct scsi_sense_hdr sense_hdr; 1073 struct vmscsi_request *vm_srb; 1074 u32 data_transfer_length; 1075 struct Scsi_Host *host; 1076 u32 payload_sz = cmd_request->payload_sz; 1077 void *payload = cmd_request->payload; 1078 1079 host = stor_dev->host; 1080 1081 vm_srb = &cmd_request->vstor_packet.vm_srb; 1082 data_transfer_length = vm_srb->data_transfer_length; 1083 1084 scmnd->result = vm_srb->scsi_status; 1085 1086 if (scmnd->result) { 1087 if (scsi_normalize_sense(scmnd->sense_buffer, 1088 SCSI_SENSE_BUFFERSIZE, &sense_hdr) && 1089 !(sense_hdr.sense_key == NOT_READY && 1090 sense_hdr.asc == 0x03A) && 1091 do_logging(STORVSC_LOGGING_ERROR)) 1092 scsi_print_sense_hdr(scmnd->device, "storvsc", 1093 &sense_hdr); 1094 } 1095 1096 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { 1097 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 1098 sense_hdr.ascq); 1099 /* 1100 * The Windows driver set data_transfer_length on 1101 * SRB_STATUS_DATA_OVERRUN. On other errors, this value 1102 * is untouched. In these cases we set it to 0. 1103 */ 1104 if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) 1105 data_transfer_length = 0; 1106 } 1107 1108 /* Validate data_transfer_length (from Hyper-V) */ 1109 if (data_transfer_length > cmd_request->payload->range.len) 1110 data_transfer_length = cmd_request->payload->range.len; 1111 1112 scsi_set_resid(scmnd, 1113 cmd_request->payload->range.len - data_transfer_length); 1114 1115 scmnd->scsi_done(scmnd); 1116 1117 if (payload_sz > 1118 sizeof(struct vmbus_channel_packet_multipage_buffer)) 1119 kfree(payload); 1120 } 1121 1122 static void storvsc_on_io_completion(struct storvsc_device *stor_device, 1123 struct vstor_packet *vstor_packet, 1124 struct storvsc_cmd_request *request) 1125 { 1126 struct vstor_packet *stor_pkt; 1127 struct hv_device *device = stor_device->device; 1128 1129 stor_pkt = &request->vstor_packet; 1130 1131 /* 1132 * The current SCSI handling on the host side does 1133 * not correctly handle: 1134 * INQUIRY command with page code parameter set to 0x80 1135 * MODE_SENSE command with cmd[2] == 0x1c 1136 * 1137 * Setup srb and scsi status so this won't be fatal. 1138 * We do this so we can distinguish truly fatal failues 1139 * (srb status == 0x4) and off-line the device in that case. 1140 */ 1141 1142 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 1143 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 1144 vstor_packet->vm_srb.scsi_status = 0; 1145 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 1146 } 1147 1148 1149 /* Copy over the status...etc */ 1150 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 1151 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 1152 1153 /* Validate sense_info_length (from Hyper-V) */ 1154 if (vstor_packet->vm_srb.sense_info_length > sense_buffer_size) 1155 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1156 1157 stor_pkt->vm_srb.sense_info_length = 1158 vstor_packet->vm_srb.sense_info_length; 1159 1160 if (vstor_packet->vm_srb.scsi_status != 0 || 1161 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) 1162 storvsc_log(device, STORVSC_LOGGING_WARN, 1163 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 1164 stor_pkt->vm_srb.cdb[0], 1165 vstor_packet->vm_srb.scsi_status, 1166 vstor_packet->vm_srb.srb_status); 1167 1168 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1169 /* CHECK_CONDITION */ 1170 if (vstor_packet->vm_srb.srb_status & 1171 SRB_STATUS_AUTOSENSE_VALID) { 1172 /* autosense data available */ 1173 1174 storvsc_log(device, STORVSC_LOGGING_WARN, 1175 "stor pkt %p autosense data valid - len %d\n", 1176 request, vstor_packet->vm_srb.sense_info_length); 1177 1178 memcpy(request->cmd->sense_buffer, 1179 vstor_packet->vm_srb.sense_data, 1180 vstor_packet->vm_srb.sense_info_length); 1181 1182 } 1183 } 1184 1185 stor_pkt->vm_srb.data_transfer_length = 1186 vstor_packet->vm_srb.data_transfer_length; 1187 1188 storvsc_command_completion(request, stor_device); 1189 1190 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1191 stor_device->drain_notify) 1192 wake_up(&stor_device->waiting_to_drain); 1193 1194 1195 } 1196 1197 static void storvsc_on_receive(struct storvsc_device *stor_device, 1198 struct vstor_packet *vstor_packet, 1199 struct storvsc_cmd_request *request) 1200 { 1201 struct hv_host_device *host_dev; 1202 switch (vstor_packet->operation) { 1203 case VSTOR_OPERATION_COMPLETE_IO: 1204 storvsc_on_io_completion(stor_device, vstor_packet, request); 1205 break; 1206 1207 case VSTOR_OPERATION_REMOVE_DEVICE: 1208 case VSTOR_OPERATION_ENUMERATE_BUS: 1209 host_dev = shost_priv(stor_device->host); 1210 queue_work( 1211 host_dev->handle_error_wq, &host_dev->host_scan_work); 1212 break; 1213 1214 case VSTOR_OPERATION_FCHBA_DATA: 1215 cache_wwn(stor_device, vstor_packet); 1216 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1217 fc_host_node_name(stor_device->host) = stor_device->node_name; 1218 fc_host_port_name(stor_device->host) = stor_device->port_name; 1219 #endif 1220 break; 1221 default: 1222 break; 1223 } 1224 } 1225 1226 static void storvsc_on_channel_callback(void *context) 1227 { 1228 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1229 const struct vmpacket_descriptor *desc; 1230 struct hv_device *device; 1231 struct storvsc_device *stor_device; 1232 1233 if (channel->primary_channel != NULL) 1234 device = channel->primary_channel->device_obj; 1235 else 1236 device = channel->device_obj; 1237 1238 stor_device = get_in_stor_device(device); 1239 if (!stor_device) 1240 return; 1241 1242 foreach_vmbus_pkt(desc, channel) { 1243 void *packet = hv_pkt_data(desc); 1244 struct storvsc_cmd_request *request; 1245 1246 request = (struct storvsc_cmd_request *) 1247 ((unsigned long)desc->trans_id); 1248 1249 if (request == &stor_device->init_request || 1250 request == &stor_device->reset_request) { 1251 memcpy(&request->vstor_packet, packet, 1252 (sizeof(struct vstor_packet) - vmscsi_size_delta)); 1253 complete(&request->wait_event); 1254 } else { 1255 storvsc_on_receive(stor_device, packet, request); 1256 } 1257 } 1258 } 1259 1260 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, 1261 bool is_fc) 1262 { 1263 struct vmstorage_channel_properties props; 1264 int ret; 1265 1266 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1267 1268 ret = vmbus_open(device->channel, 1269 ring_size, 1270 ring_size, 1271 (void *)&props, 1272 sizeof(struct vmstorage_channel_properties), 1273 storvsc_on_channel_callback, device->channel); 1274 1275 if (ret != 0) 1276 return ret; 1277 1278 ret = storvsc_channel_init(device, is_fc); 1279 1280 return ret; 1281 } 1282 1283 static int storvsc_dev_remove(struct hv_device *device) 1284 { 1285 struct storvsc_device *stor_device; 1286 1287 stor_device = hv_get_drvdata(device); 1288 1289 stor_device->destroy = true; 1290 1291 /* Make sure flag is set before waiting */ 1292 wmb(); 1293 1294 /* 1295 * At this point, all outbound traffic should be disable. We 1296 * only allow inbound traffic (responses) to proceed so that 1297 * outstanding requests can be completed. 1298 */ 1299 1300 storvsc_wait_to_drain(stor_device); 1301 1302 /* 1303 * Since we have already drained, we don't need to busy wait 1304 * as was done in final_release_stor_device() 1305 * Note that we cannot set the ext pointer to NULL until 1306 * we have drained - to drain the outgoing packets, we need to 1307 * allow incoming packets. 1308 */ 1309 hv_set_drvdata(device, NULL); 1310 1311 /* Close the channel */ 1312 vmbus_close(device->channel); 1313 1314 kfree(stor_device->stor_chns); 1315 kfree(stor_device); 1316 return 0; 1317 } 1318 1319 static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, 1320 u16 q_num) 1321 { 1322 u16 slot = 0; 1323 u16 hash_qnum; 1324 const struct cpumask *node_mask; 1325 int num_channels, tgt_cpu; 1326 1327 if (stor_device->num_sc == 0) { 1328 stor_device->stor_chns[q_num] = stor_device->device->channel; 1329 return stor_device->device->channel; 1330 } 1331 1332 /* 1333 * Our channel array is sparsley populated and we 1334 * initiated I/O on a processor/hw-q that does not 1335 * currently have a designated channel. Fix this. 1336 * The strategy is simple: 1337 * I. Ensure NUMA locality 1338 * II. Distribute evenly (best effort) 1339 */ 1340 1341 node_mask = cpumask_of_node(cpu_to_node(q_num)); 1342 1343 num_channels = 0; 1344 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1345 if (cpumask_test_cpu(tgt_cpu, node_mask)) 1346 num_channels++; 1347 } 1348 if (num_channels == 0) { 1349 stor_device->stor_chns[q_num] = stor_device->device->channel; 1350 return stor_device->device->channel; 1351 } 1352 1353 hash_qnum = q_num; 1354 while (hash_qnum >= num_channels) 1355 hash_qnum -= num_channels; 1356 1357 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1358 if (!cpumask_test_cpu(tgt_cpu, node_mask)) 1359 continue; 1360 if (slot == hash_qnum) 1361 break; 1362 slot++; 1363 } 1364 1365 stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; 1366 1367 return stor_device->stor_chns[q_num]; 1368 } 1369 1370 1371 static int storvsc_do_io(struct hv_device *device, 1372 struct storvsc_cmd_request *request, u16 q_num) 1373 { 1374 struct storvsc_device *stor_device; 1375 struct vstor_packet *vstor_packet; 1376 struct vmbus_channel *outgoing_channel, *channel; 1377 unsigned long flags; 1378 int ret = 0; 1379 const struct cpumask *node_mask; 1380 int tgt_cpu; 1381 1382 vstor_packet = &request->vstor_packet; 1383 stor_device = get_out_stor_device(device); 1384 1385 if (!stor_device) 1386 return -ENODEV; 1387 1388 1389 request->device = device; 1390 /* 1391 * Select an appropriate channel to send the request out. 1392 */ 1393 /* See storvsc_change_target_cpu(). */ 1394 outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]); 1395 if (outgoing_channel != NULL) { 1396 if (outgoing_channel->target_cpu == q_num) { 1397 /* 1398 * Ideally, we want to pick a different channel if 1399 * available on the same NUMA node. 1400 */ 1401 node_mask = cpumask_of_node(cpu_to_node(q_num)); 1402 for_each_cpu_wrap(tgt_cpu, 1403 &stor_device->alloced_cpus, q_num + 1) { 1404 if (!cpumask_test_cpu(tgt_cpu, node_mask)) 1405 continue; 1406 if (tgt_cpu == q_num) 1407 continue; 1408 channel = READ_ONCE( 1409 stor_device->stor_chns[tgt_cpu]); 1410 if (channel == NULL) 1411 continue; 1412 if (hv_get_avail_to_write_percent( 1413 &channel->outbound) 1414 > ring_avail_percent_lowater) { 1415 outgoing_channel = channel; 1416 goto found_channel; 1417 } 1418 } 1419 1420 /* 1421 * All the other channels on the same NUMA node are 1422 * busy. Try to use the channel on the current CPU 1423 */ 1424 if (hv_get_avail_to_write_percent( 1425 &outgoing_channel->outbound) 1426 > ring_avail_percent_lowater) 1427 goto found_channel; 1428 1429 /* 1430 * If we reach here, all the channels on the current 1431 * NUMA node are busy. Try to find a channel in 1432 * other NUMA nodes 1433 */ 1434 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1435 if (cpumask_test_cpu(tgt_cpu, node_mask)) 1436 continue; 1437 channel = READ_ONCE( 1438 stor_device->stor_chns[tgt_cpu]); 1439 if (channel == NULL) 1440 continue; 1441 if (hv_get_avail_to_write_percent( 1442 &channel->outbound) 1443 > ring_avail_percent_lowater) { 1444 outgoing_channel = channel; 1445 goto found_channel; 1446 } 1447 } 1448 } 1449 } else { 1450 spin_lock_irqsave(&stor_device->lock, flags); 1451 outgoing_channel = stor_device->stor_chns[q_num]; 1452 if (outgoing_channel != NULL) { 1453 spin_unlock_irqrestore(&stor_device->lock, flags); 1454 goto found_channel; 1455 } 1456 outgoing_channel = get_og_chn(stor_device, q_num); 1457 spin_unlock_irqrestore(&stor_device->lock, flags); 1458 } 1459 1460 found_channel: 1461 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1462 1463 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1464 vmscsi_size_delta); 1465 1466 1467 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1468 1469 1470 vstor_packet->vm_srb.data_transfer_length = 1471 request->payload->range.len; 1472 1473 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1474 1475 if (request->payload->range.len) { 1476 1477 ret = vmbus_sendpacket_mpb_desc(outgoing_channel, 1478 request->payload, request->payload_sz, 1479 vstor_packet, 1480 (sizeof(struct vstor_packet) - 1481 vmscsi_size_delta), 1482 (unsigned long)request); 1483 } else { 1484 ret = vmbus_sendpacket(outgoing_channel, vstor_packet, 1485 (sizeof(struct vstor_packet) - 1486 vmscsi_size_delta), 1487 (unsigned long)request, 1488 VM_PKT_DATA_INBAND, 1489 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1490 } 1491 1492 if (ret != 0) 1493 return ret; 1494 1495 atomic_inc(&stor_device->num_outstanding_req); 1496 1497 return ret; 1498 } 1499 1500 static int storvsc_device_alloc(struct scsi_device *sdevice) 1501 { 1502 /* 1503 * Set blist flag to permit the reading of the VPD pages even when 1504 * the target may claim SPC-2 compliance. MSFT targets currently 1505 * claim SPC-2 compliance while they implement post SPC-2 features. 1506 * With this flag we can correctly handle WRITE_SAME_16 issues. 1507 * 1508 * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but 1509 * still supports REPORT LUN. 1510 */ 1511 sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; 1512 1513 return 0; 1514 } 1515 1516 static int storvsc_device_configure(struct scsi_device *sdevice) 1517 { 1518 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1519 1520 sdevice->no_write_same = 1; 1521 1522 /* 1523 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 1524 * if the device is a MSFT virtual device. If the host is 1525 * WIN10 or newer, allow write_same. 1526 */ 1527 if (!strncmp(sdevice->vendor, "Msft", 4)) { 1528 switch (vmstor_proto_version) { 1529 case VMSTOR_PROTO_VERSION_WIN8: 1530 case VMSTOR_PROTO_VERSION_WIN8_1: 1531 sdevice->scsi_level = SCSI_SPC_3; 1532 break; 1533 } 1534 1535 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) 1536 sdevice->no_write_same = 0; 1537 } 1538 1539 return 0; 1540 } 1541 1542 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1543 sector_t capacity, int *info) 1544 { 1545 sector_t nsect = capacity; 1546 sector_t cylinders = nsect; 1547 int heads, sectors_pt; 1548 1549 /* 1550 * We are making up these values; let us keep it simple. 1551 */ 1552 heads = 0xff; 1553 sectors_pt = 0x3f; /* Sectors per track */ 1554 sector_div(cylinders, heads * sectors_pt); 1555 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1556 cylinders = 0xffff; 1557 1558 info[0] = heads; 1559 info[1] = sectors_pt; 1560 info[2] = (int)cylinders; 1561 1562 return 0; 1563 } 1564 1565 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1566 { 1567 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1568 struct hv_device *device = host_dev->dev; 1569 1570 struct storvsc_device *stor_device; 1571 struct storvsc_cmd_request *request; 1572 struct vstor_packet *vstor_packet; 1573 int ret, t; 1574 1575 1576 stor_device = get_out_stor_device(device); 1577 if (!stor_device) 1578 return FAILED; 1579 1580 request = &stor_device->reset_request; 1581 vstor_packet = &request->vstor_packet; 1582 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 1583 1584 init_completion(&request->wait_event); 1585 1586 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1587 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1588 vstor_packet->vm_srb.path_id = stor_device->path_id; 1589 1590 ret = vmbus_sendpacket(device->channel, vstor_packet, 1591 (sizeof(struct vstor_packet) - 1592 vmscsi_size_delta), 1593 (unsigned long)&stor_device->reset_request, 1594 VM_PKT_DATA_INBAND, 1595 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1596 if (ret != 0) 1597 return FAILED; 1598 1599 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1600 if (t == 0) 1601 return TIMEOUT_ERROR; 1602 1603 1604 /* 1605 * At this point, all outstanding requests in the adapter 1606 * should have been flushed out and return to us 1607 * There is a potential race here where the host may be in 1608 * the process of responding when we return from here. 1609 * Just wait for all in-transit packets to be accounted for 1610 * before we return from here. 1611 */ 1612 storvsc_wait_to_drain(stor_device); 1613 1614 return SUCCESS; 1615 } 1616 1617 /* 1618 * The host guarantees to respond to each command, although I/O latencies might 1619 * be unbounded on Azure. Reset the timer unconditionally to give the host a 1620 * chance to perform EH. 1621 */ 1622 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) 1623 { 1624 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1625 if (scmnd->device->host->transportt == fc_transport_template) 1626 return fc_eh_timed_out(scmnd); 1627 #endif 1628 return BLK_EH_RESET_TIMER; 1629 } 1630 1631 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1632 { 1633 bool allowed = true; 1634 u8 scsi_op = scmnd->cmnd[0]; 1635 1636 switch (scsi_op) { 1637 /* the host does not handle WRITE_SAME, log accident usage */ 1638 case WRITE_SAME: 1639 /* 1640 * smartd sends this command and the host does not handle 1641 * this. So, don't send it. 1642 */ 1643 case SET_WINDOW: 1644 scmnd->result = ILLEGAL_REQUEST << 16; 1645 allowed = false; 1646 break; 1647 default: 1648 break; 1649 } 1650 return allowed; 1651 } 1652 1653 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1654 { 1655 int ret; 1656 struct hv_host_device *host_dev = shost_priv(host); 1657 struct hv_device *dev = host_dev->dev; 1658 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); 1659 int i; 1660 struct scatterlist *sgl; 1661 unsigned int sg_count = 0; 1662 struct vmscsi_request *vm_srb; 1663 struct scatterlist *cur_sgl; 1664 struct vmbus_packet_mpb_array *payload; 1665 u32 payload_sz; 1666 u32 length; 1667 1668 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { 1669 /* 1670 * On legacy hosts filter unimplemented commands. 1671 * Future hosts are expected to correctly handle 1672 * unsupported commands. Furthermore, it is 1673 * possible that some of the currently 1674 * unsupported commands maybe supported in 1675 * future versions of the host. 1676 */ 1677 if (!storvsc_scsi_cmd_ok(scmnd)) { 1678 scmnd->scsi_done(scmnd); 1679 return 0; 1680 } 1681 } 1682 1683 /* Setup the cmd request */ 1684 cmd_request->cmd = scmnd; 1685 1686 memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet)); 1687 vm_srb = &cmd_request->vstor_packet.vm_srb; 1688 vm_srb->win8_extension.time_out_value = 60; 1689 1690 vm_srb->win8_extension.srb_flags |= 1691 SRB_FLAGS_DISABLE_SYNCH_TRANSFER; 1692 1693 if (scmnd->device->tagged_supported) { 1694 vm_srb->win8_extension.srb_flags |= 1695 (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); 1696 vm_srb->win8_extension.queue_tag = SP_UNTAGGED; 1697 vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; 1698 } 1699 1700 /* Build the SRB */ 1701 switch (scmnd->sc_data_direction) { 1702 case DMA_TO_DEVICE: 1703 vm_srb->data_in = WRITE_TYPE; 1704 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1705 break; 1706 case DMA_FROM_DEVICE: 1707 vm_srb->data_in = READ_TYPE; 1708 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1709 break; 1710 case DMA_NONE: 1711 vm_srb->data_in = UNKNOWN_TYPE; 1712 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; 1713 break; 1714 default: 1715 /* 1716 * This is DMA_BIDIRECTIONAL or something else we are never 1717 * supposed to see here. 1718 */ 1719 WARN(1, "Unexpected data direction: %d\n", 1720 scmnd->sc_data_direction); 1721 return -EINVAL; 1722 } 1723 1724 1725 vm_srb->port_number = host_dev->port; 1726 vm_srb->path_id = scmnd->device->channel; 1727 vm_srb->target_id = scmnd->device->id; 1728 vm_srb->lun = scmnd->device->lun; 1729 1730 vm_srb->cdb_length = scmnd->cmd_len; 1731 1732 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1733 1734 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1735 sg_count = scsi_sg_count(scmnd); 1736 1737 length = scsi_bufflen(scmnd); 1738 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; 1739 payload_sz = sizeof(cmd_request->mpb); 1740 1741 if (sg_count) { 1742 unsigned int hvpgoff = 0; 1743 unsigned long offset_in_hvpg = sgl->offset & ~HV_HYP_PAGE_MASK; 1744 unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); 1745 u64 hvpfn; 1746 1747 if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { 1748 1749 payload_sz = (hvpg_count * sizeof(u64) + 1750 sizeof(struct vmbus_packet_mpb_array)); 1751 payload = kzalloc(payload_sz, GFP_ATOMIC); 1752 if (!payload) 1753 return SCSI_MLQUEUE_DEVICE_BUSY; 1754 } 1755 1756 /* 1757 * sgl is a list of PAGEs, and payload->range.pfn_array 1758 * expects the page number in the unit of HV_HYP_PAGE_SIZE (the 1759 * page size that Hyper-V uses, so here we need to divide PAGEs 1760 * into HV_HYP_PAGE in case that PAGE_SIZE > HV_HYP_PAGE_SIZE. 1761 * Besides, payload->range.offset should be the offset in one 1762 * HV_HYP_PAGE. 1763 */ 1764 payload->range.len = length; 1765 payload->range.offset = offset_in_hvpg; 1766 hvpgoff = sgl->offset >> HV_HYP_PAGE_SHIFT; 1767 1768 cur_sgl = sgl; 1769 for (i = 0; i < hvpg_count; i++) { 1770 /* 1771 * 'i' is the index of hv pages in the payload and 1772 * 'hvpgoff' is the offset (in hv pages) of the first 1773 * hv page in the the first page. The relationship 1774 * between the sum of 'i' and 'hvpgoff' and the offset 1775 * (in hv pages) in a payload page ('hvpgoff_in_page') 1776 * is as follow: 1777 * 1778 * |------------------ PAGE -------------------| 1779 * | NR_HV_HYP_PAGES_IN_PAGE hvpgs in total | 1780 * |hvpg|hvpg| ... |hvpg|... |hvpg| 1781 * ^ ^ ^ ^ 1782 * +-hvpgoff-+ +-hvpgoff_in_page-+ 1783 * ^ | 1784 * +--------------------- i ---------------------------+ 1785 */ 1786 unsigned int hvpgoff_in_page = 1787 (i + hvpgoff) % NR_HV_HYP_PAGES_IN_PAGE; 1788 1789 /* 1790 * Two cases that we need to fetch a page: 1791 * 1) i == 0, the first step or 1792 * 2) hvpgoff_in_page == 0, when we reach the boundary 1793 * of a page. 1794 */ 1795 if (hvpgoff_in_page == 0 || i == 0) { 1796 hvpfn = page_to_hvpfn(sg_page(cur_sgl)); 1797 cur_sgl = sg_next(cur_sgl); 1798 } 1799 1800 payload->range.pfn_array[i] = hvpfn + hvpgoff_in_page; 1801 } 1802 } 1803 1804 cmd_request->payload = payload; 1805 cmd_request->payload_sz = payload_sz; 1806 1807 /* Invokes the vsc to start an IO */ 1808 ret = storvsc_do_io(dev, cmd_request, get_cpu()); 1809 put_cpu(); 1810 1811 if (ret == -EAGAIN) { 1812 if (payload_sz > sizeof(cmd_request->mpb)) 1813 kfree(payload); 1814 /* no more space */ 1815 return SCSI_MLQUEUE_DEVICE_BUSY; 1816 } 1817 1818 return 0; 1819 } 1820 1821 static struct scsi_host_template scsi_driver = { 1822 .module = THIS_MODULE, 1823 .name = "storvsc_host_t", 1824 .cmd_size = sizeof(struct storvsc_cmd_request), 1825 .bios_param = storvsc_get_chs, 1826 .queuecommand = storvsc_queuecommand, 1827 .eh_host_reset_handler = storvsc_host_reset_handler, 1828 .proc_name = "storvsc_host", 1829 .eh_timed_out = storvsc_eh_timed_out, 1830 .slave_alloc = storvsc_device_alloc, 1831 .slave_configure = storvsc_device_configure, 1832 .cmd_per_lun = 2048, 1833 .this_id = -1, 1834 /* Make sure we dont get a sg segment crosses a page boundary */ 1835 .dma_boundary = PAGE_SIZE-1, 1836 /* Ensure there are no gaps in presented sgls */ 1837 .virt_boundary_mask = PAGE_SIZE-1, 1838 .no_write_same = 1, 1839 .track_queue_depth = 1, 1840 .change_queue_depth = storvsc_change_queue_depth, 1841 }; 1842 1843 enum { 1844 SCSI_GUID, 1845 IDE_GUID, 1846 SFC_GUID, 1847 }; 1848 1849 static const struct hv_vmbus_device_id id_table[] = { 1850 /* SCSI guid */ 1851 { HV_SCSI_GUID, 1852 .driver_data = SCSI_GUID 1853 }, 1854 /* IDE guid */ 1855 { HV_IDE_GUID, 1856 .driver_data = IDE_GUID 1857 }, 1858 /* Fibre Channel GUID */ 1859 { 1860 HV_SYNTHFC_GUID, 1861 .driver_data = SFC_GUID 1862 }, 1863 { }, 1864 }; 1865 1866 MODULE_DEVICE_TABLE(vmbus, id_table); 1867 1868 static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID }; 1869 1870 static bool hv_dev_is_fc(struct hv_device *hv_dev) 1871 { 1872 return guid_equal(&fc_guid.guid, &hv_dev->dev_type); 1873 } 1874 1875 static int storvsc_probe(struct hv_device *device, 1876 const struct hv_vmbus_device_id *dev_id) 1877 { 1878 int ret; 1879 int num_cpus = num_online_cpus(); 1880 struct Scsi_Host *host; 1881 struct hv_host_device *host_dev; 1882 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1883 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); 1884 int target = 0; 1885 struct storvsc_device *stor_device; 1886 int max_luns_per_target; 1887 int max_targets; 1888 int max_channels; 1889 int max_sub_channels = 0; 1890 1891 /* 1892 * Based on the windows host we are running on, 1893 * set state to properly communicate with the host. 1894 */ 1895 1896 if (vmbus_proto_version < VERSION_WIN8) { 1897 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1898 max_targets = STORVSC_IDE_MAX_TARGETS; 1899 max_channels = STORVSC_IDE_MAX_CHANNELS; 1900 } else { 1901 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; 1902 max_targets = STORVSC_MAX_TARGETS; 1903 max_channels = STORVSC_MAX_CHANNELS; 1904 /* 1905 * On Windows8 and above, we support sub-channels for storage 1906 * on SCSI and FC controllers. 1907 * The number of sub-channels offerred is based on the number of 1908 * VCPUs in the guest. 1909 */ 1910 if (!dev_is_ide) 1911 max_sub_channels = 1912 (num_cpus - 1) / storvsc_vcpus_per_sub_channel; 1913 } 1914 1915 scsi_driver.can_queue = max_outstanding_req_per_channel * 1916 (max_sub_channels + 1) * 1917 (100 - ring_avail_percent_lowater) / 100; 1918 1919 host = scsi_host_alloc(&scsi_driver, 1920 sizeof(struct hv_host_device)); 1921 if (!host) 1922 return -ENOMEM; 1923 1924 host_dev = shost_priv(host); 1925 memset(host_dev, 0, sizeof(struct hv_host_device)); 1926 1927 host_dev->port = host->host_no; 1928 host_dev->dev = device; 1929 host_dev->host = host; 1930 1931 1932 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1933 if (!stor_device) { 1934 ret = -ENOMEM; 1935 goto err_out0; 1936 } 1937 1938 stor_device->destroy = false; 1939 init_waitqueue_head(&stor_device->waiting_to_drain); 1940 stor_device->device = device; 1941 stor_device->host = host; 1942 spin_lock_init(&stor_device->lock); 1943 hv_set_drvdata(device, stor_device); 1944 1945 stor_device->port_number = host->host_no; 1946 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); 1947 if (ret) 1948 goto err_out1; 1949 1950 host_dev->path = stor_device->path_id; 1951 host_dev->target = stor_device->target_id; 1952 1953 switch (dev_id->driver_data) { 1954 case SFC_GUID: 1955 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; 1956 host->max_id = STORVSC_FC_MAX_TARGETS; 1957 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; 1958 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1959 host->transportt = fc_transport_template; 1960 #endif 1961 break; 1962 1963 case SCSI_GUID: 1964 host->max_lun = max_luns_per_target; 1965 host->max_id = max_targets; 1966 host->max_channel = max_channels - 1; 1967 break; 1968 1969 default: 1970 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1971 host->max_id = STORVSC_IDE_MAX_TARGETS; 1972 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; 1973 break; 1974 } 1975 /* max cmd length */ 1976 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1977 1978 /* 1979 * set the table size based on the info we got 1980 * from the host. 1981 */ 1982 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); 1983 /* 1984 * For non-IDE disks, the host supports multiple channels. 1985 * Set the number of HW queues we are supporting. 1986 */ 1987 if (!dev_is_ide) 1988 host->nr_hw_queues = num_present_cpus(); 1989 1990 /* 1991 * Set the error handler work queue. 1992 */ 1993 host_dev->handle_error_wq = 1994 alloc_ordered_workqueue("storvsc_error_wq_%d", 1995 WQ_MEM_RECLAIM, 1996 host->host_no); 1997 if (!host_dev->handle_error_wq) 1998 goto err_out2; 1999 INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); 2000 /* Register the HBA and start the scsi bus scan */ 2001 ret = scsi_add_host(host, &device->device); 2002 if (ret != 0) 2003 goto err_out3; 2004 2005 if (!dev_is_ide) { 2006 scsi_scan_host(host); 2007 } else { 2008 target = (device->dev_instance.b[5] << 8 | 2009 device->dev_instance.b[4]); 2010 ret = scsi_add_device(host, 0, target, 0); 2011 if (ret) 2012 goto err_out4; 2013 } 2014 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2015 if (host->transportt == fc_transport_template) { 2016 struct fc_rport_identifiers ids = { 2017 .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, 2018 }; 2019 2020 fc_host_node_name(host) = stor_device->node_name; 2021 fc_host_port_name(host) = stor_device->port_name; 2022 stor_device->rport = fc_remote_port_add(host, 0, &ids); 2023 if (!stor_device->rport) { 2024 ret = -ENOMEM; 2025 goto err_out4; 2026 } 2027 } 2028 #endif 2029 return 0; 2030 2031 err_out4: 2032 scsi_remove_host(host); 2033 2034 err_out3: 2035 destroy_workqueue(host_dev->handle_error_wq); 2036 2037 err_out2: 2038 /* 2039 * Once we have connected with the host, we would need to 2040 * to invoke storvsc_dev_remove() to rollback this state and 2041 * this call also frees up the stor_device; hence the jump around 2042 * err_out1 label. 2043 */ 2044 storvsc_dev_remove(device); 2045 goto err_out0; 2046 2047 err_out1: 2048 kfree(stor_device->stor_chns); 2049 kfree(stor_device); 2050 2051 err_out0: 2052 scsi_host_put(host); 2053 return ret; 2054 } 2055 2056 /* Change a scsi target's queue depth */ 2057 static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth) 2058 { 2059 if (queue_depth > scsi_driver.can_queue) 2060 queue_depth = scsi_driver.can_queue; 2061 2062 return scsi_change_queue_depth(sdev, queue_depth); 2063 } 2064 2065 static int storvsc_remove(struct hv_device *dev) 2066 { 2067 struct storvsc_device *stor_device = hv_get_drvdata(dev); 2068 struct Scsi_Host *host = stor_device->host; 2069 struct hv_host_device *host_dev = shost_priv(host); 2070 2071 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2072 if (host->transportt == fc_transport_template) { 2073 fc_remote_port_delete(stor_device->rport); 2074 fc_remove_host(host); 2075 } 2076 #endif 2077 destroy_workqueue(host_dev->handle_error_wq); 2078 scsi_remove_host(host); 2079 storvsc_dev_remove(dev); 2080 scsi_host_put(host); 2081 2082 return 0; 2083 } 2084 2085 static int storvsc_suspend(struct hv_device *hv_dev) 2086 { 2087 struct storvsc_device *stor_device = hv_get_drvdata(hv_dev); 2088 struct Scsi_Host *host = stor_device->host; 2089 struct hv_host_device *host_dev = shost_priv(host); 2090 2091 storvsc_wait_to_drain(stor_device); 2092 2093 drain_workqueue(host_dev->handle_error_wq); 2094 2095 vmbus_close(hv_dev->channel); 2096 2097 kfree(stor_device->stor_chns); 2098 stor_device->stor_chns = NULL; 2099 2100 cpumask_clear(&stor_device->alloced_cpus); 2101 2102 return 0; 2103 } 2104 2105 static int storvsc_resume(struct hv_device *hv_dev) 2106 { 2107 int ret; 2108 2109 ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, 2110 hv_dev_is_fc(hv_dev)); 2111 return ret; 2112 } 2113 2114 static struct hv_driver storvsc_drv = { 2115 .name = KBUILD_MODNAME, 2116 .id_table = id_table, 2117 .probe = storvsc_probe, 2118 .remove = storvsc_remove, 2119 .suspend = storvsc_suspend, 2120 .resume = storvsc_resume, 2121 .driver = { 2122 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 2123 }, 2124 }; 2125 2126 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2127 static struct fc_function_template fc_transport_functions = { 2128 .show_host_node_name = 1, 2129 .show_host_port_name = 1, 2130 }; 2131 #endif 2132 2133 static int __init storvsc_drv_init(void) 2134 { 2135 int ret; 2136 2137 /* 2138 * Divide the ring buffer data size (which is 1 page less 2139 * than the ring buffer size since that page is reserved for 2140 * the ring buffer indices) by the max request size (which is 2141 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 2142 */ 2143 max_outstanding_req_per_channel = 2144 ((storvsc_ringbuffer_size - PAGE_SIZE) / 2145 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 2146 sizeof(struct vstor_packet) + sizeof(u64) - 2147 vmscsi_size_delta, 2148 sizeof(u64))); 2149 2150 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2151 fc_transport_template = fc_attach_transport(&fc_transport_functions); 2152 if (!fc_transport_template) 2153 return -ENODEV; 2154 #endif 2155 2156 ret = vmbus_driver_register(&storvsc_drv); 2157 2158 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2159 if (ret) 2160 fc_release_transport(fc_transport_template); 2161 #endif 2162 2163 return ret; 2164 } 2165 2166 static void __exit storvsc_drv_exit(void) 2167 { 2168 vmbus_driver_unregister(&storvsc_drv); 2169 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2170 fc_release_transport(fc_transport_template); 2171 #endif 2172 } 2173 2174 MODULE_LICENSE("GPL"); 2175 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 2176 module_init(storvsc_drv_init); 2177 module_exit(storvsc_drv_exit); 2178