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. */ 63enum 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 84struct 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 */ 149static 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*/ 156static int vmstor_proto_version; 157 158#define STORVSC_LOGGING_NONE 0 159#define STORVSC_LOGGING_ERROR 1 160#define STORVSC_LOGGING_WARN 2 161 162static int logging_level = STORVSC_LOGGING_ERROR; 163module_param(logging_level, int, S_IRUGO|S_IWUSR); 164MODULE_PARM_DESC(logging_level, 165 "Logging level, 0 - None, 1 - Error (default), 2 - Warning."); 166 167static inline bool do_logging(int level) 168{ 169 return logging_level >= level; 170} 171 172#define storvsc_log(dev, level, fmt, ...) \ 173do { \ 174 if (do_logging(level)) \ 175 dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ 176} while (0) 177 178struct 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 190struct 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 */ 229static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 230 231/* 232 * The list of storage protocols in order of preference. 233 */ 234struct vmstor_protocol { 235 int protocol_version; 236 int sense_buffer_size; 237 int vmscsi_size_delta; 238}; 239 240 241static 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 277struct 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. */ 289struct 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 307struct 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 */ 352enum storvsc_request_type { 353 WRITE_TYPE = 0, 354 READ_TYPE, 355 UNKNOWN_TYPE, 356}; 357 358/* 359 * SRB status codes and masks. In the 8-bit field, the two high order bits 360 * are flags, while the remaining 6 bits are an integer status code. The 361 * definitions here include only the subset of the integer status codes that 362 * are tested for in this driver. 363 */ 364#define SRB_STATUS_AUTOSENSE_VALID 0x80 365#define SRB_STATUS_QUEUE_FROZEN 0x40 366 367/* SRB status integer codes */ 368#define SRB_STATUS_SUCCESS 0x01 369#define SRB_STATUS_ABORTED 0x02 370#define SRB_STATUS_ERROR 0x04 371#define SRB_STATUS_INVALID_REQUEST 0x06 372#define SRB_STATUS_DATA_OVERRUN 0x12 373#define SRB_STATUS_INVALID_LUN 0x20 374 375#define SRB_STATUS(status) \ 376 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) 377/* 378 * This is the end of Protocol specific defines. 379 */ 380 381static int storvsc_ringbuffer_size = (128 * 1024); 382static u32 max_outstanding_req_per_channel; 383static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth); 384 385static int storvsc_vcpus_per_sub_channel = 4; 386 387module_param(storvsc_ringbuffer_size, int, S_IRUGO); 388MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 389 390module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); 391MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); 392 393static int ring_avail_percent_lowater = 10; 394module_param(ring_avail_percent_lowater, int, S_IRUGO); 395MODULE_PARM_DESC(ring_avail_percent_lowater, 396 "Select a channel if available ring size > this in percent"); 397 398/* 399 * Timeout in seconds for all devices managed by this driver. 400 */ 401static int storvsc_timeout = 180; 402 403#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 404static struct scsi_transport_template *fc_transport_template; 405#endif 406 407static void storvsc_on_channel_callback(void *context); 408 409#define STORVSC_MAX_LUNS_PER_TARGET 255 410#define STORVSC_MAX_TARGETS 2 411#define STORVSC_MAX_CHANNELS 8 412 413#define STORVSC_FC_MAX_LUNS_PER_TARGET 255 414#define STORVSC_FC_MAX_TARGETS 128 415#define STORVSC_FC_MAX_CHANNELS 8 416 417#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 418#define STORVSC_IDE_MAX_TARGETS 1 419#define STORVSC_IDE_MAX_CHANNELS 1 420 421struct storvsc_cmd_request { 422 struct scsi_cmnd *cmd; 423 424 struct hv_device *device; 425 426 /* Synchronize the request/response if needed */ 427 struct completion wait_event; 428 429 struct vmbus_channel_packet_multipage_buffer mpb; 430 struct vmbus_packet_mpb_array *payload; 431 u32 payload_sz; 432 433 struct vstor_packet vstor_packet; 434}; 435 436 437/* A storvsc device is a device object that contains a vmbus channel */ 438struct storvsc_device { 439 struct hv_device *device; 440 441 bool destroy; 442 bool drain_notify; 443 atomic_t num_outstanding_req; 444 struct Scsi_Host *host; 445 446 wait_queue_head_t waiting_to_drain; 447 448 /* 449 * Each unique Port/Path/Target represents 1 channel ie scsi 450 * controller. In reality, the pathid, targetid is always 0 451 * and the port is set by us 452 */ 453 unsigned int port_number; 454 unsigned char path_id; 455 unsigned char target_id; 456 457 /* 458 * Max I/O, the device can support. 459 */ 460 u32 max_transfer_bytes; 461 /* 462 * Number of sub-channels we will open. 463 */ 464 u16 num_sc; 465 struct vmbus_channel **stor_chns; 466 /* 467 * Mask of CPUs bound to subchannels. 468 */ 469 struct cpumask alloced_cpus; 470 /* 471 * Serializes modifications of stor_chns[] from storvsc_do_io() 472 * and storvsc_change_target_cpu(). 473 */ 474 spinlock_t lock; 475 /* Used for vsc/vsp channel reset process */ 476 struct storvsc_cmd_request init_request; 477 struct storvsc_cmd_request reset_request; 478 /* 479 * Currently active port and node names for FC devices. 480 */ 481 u64 node_name; 482 u64 port_name; 483#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 484 struct fc_rport *rport; 485#endif 486}; 487 488struct hv_host_device { 489 struct hv_device *dev; 490 unsigned int port; 491 unsigned char path; 492 unsigned char target; 493 struct workqueue_struct *handle_error_wq; 494 struct work_struct host_scan_work; 495 struct Scsi_Host *host; 496}; 497 498struct storvsc_scan_work { 499 struct work_struct work; 500 struct Scsi_Host *host; 501 u8 lun; 502 u8 tgt_id; 503}; 504 505static void storvsc_device_scan(struct work_struct *work) 506{ 507 struct storvsc_scan_work *wrk; 508 struct scsi_device *sdev; 509 510 wrk = container_of(work, struct storvsc_scan_work, work); 511 512 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); 513 if (!sdev) 514 goto done; 515 scsi_rescan_device(&sdev->sdev_gendev); 516 scsi_device_put(sdev); 517 518done: 519 kfree(wrk); 520} 521 522static void storvsc_host_scan(struct work_struct *work) 523{ 524 struct Scsi_Host *host; 525 struct scsi_device *sdev; 526 struct hv_host_device *host_device = 527 container_of(work, struct hv_host_device, host_scan_work); 528 529 host = host_device->host; 530 /* 531 * Before scanning the host, first check to see if any of the 532 * currrently known devices have been hot removed. We issue a 533 * "unit ready" command against all currently known devices. 534 * This I/O will result in an error for devices that have been 535 * removed. As part of handling the I/O error, we remove the device. 536 * 537 * When a LUN is added or removed, the host sends us a signal to 538 * scan the host. Thus we are forced to discover the LUNs that 539 * may have been removed this way. 540 */ 541 mutex_lock(&host->scan_mutex); 542 shost_for_each_device(sdev, host) 543 scsi_test_unit_ready(sdev, 1, 1, NULL); 544 mutex_unlock(&host->scan_mutex); 545 /* 546 * Now scan the host to discover LUNs that may have been added. 547 */ 548 scsi_scan_host(host); 549} 550 551static void storvsc_remove_lun(struct work_struct *work) 552{ 553 struct storvsc_scan_work *wrk; 554 struct scsi_device *sdev; 555 556 wrk = container_of(work, struct storvsc_scan_work, work); 557 if (!scsi_host_get(wrk->host)) 558 goto done; 559 560 sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun); 561 562 if (sdev) { 563 scsi_remove_device(sdev); 564 scsi_device_put(sdev); 565 } 566 scsi_host_put(wrk->host); 567 568done: 569 kfree(wrk); 570} 571 572 573/* 574 * We can get incoming messages from the host that are not in response to 575 * messages that we have sent out. An example of this would be messages 576 * received by the guest to notify dynamic addition/removal of LUNs. To 577 * deal with potential race conditions where the driver may be in the 578 * midst of being unloaded when we might receive an unsolicited message 579 * from the host, we have implemented a mechanism to gurantee sequential 580 * consistency: 581 * 582 * 1) Once the device is marked as being destroyed, we will fail all 583 * outgoing messages. 584 * 2) We permit incoming messages when the device is being destroyed, 585 * only to properly account for messages already sent out. 586 */ 587 588static inline struct storvsc_device *get_out_stor_device( 589 struct hv_device *device) 590{ 591 struct storvsc_device *stor_device; 592 593 stor_device = hv_get_drvdata(device); 594 595 if (stor_device && stor_device->destroy) 596 stor_device = NULL; 597 598 return stor_device; 599} 600 601 602static inline void storvsc_wait_to_drain(struct storvsc_device *dev) 603{ 604 dev->drain_notify = true; 605 wait_event(dev->waiting_to_drain, 606 atomic_read(&dev->num_outstanding_req) == 0); 607 dev->drain_notify = false; 608} 609 610static inline struct storvsc_device *get_in_stor_device( 611 struct hv_device *device) 612{ 613 struct storvsc_device *stor_device; 614 615 stor_device = hv_get_drvdata(device); 616 617 if (!stor_device) 618 goto get_in_err; 619 620 /* 621 * If the device is being destroyed; allow incoming 622 * traffic only to cleanup outstanding requests. 623 */ 624 625 if (stor_device->destroy && 626 (atomic_read(&stor_device->num_outstanding_req) == 0)) 627 stor_device = NULL; 628 629get_in_err: 630 return stor_device; 631 632} 633 634static void storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old, 635 u32 new) 636{ 637 struct storvsc_device *stor_device; 638 struct vmbus_channel *cur_chn; 639 bool old_is_alloced = false; 640 struct hv_device *device; 641 unsigned long flags; 642 int cpu; 643 644 device = channel->primary_channel ? 645 channel->primary_channel->device_obj 646 : channel->device_obj; 647 stor_device = get_out_stor_device(device); 648 if (!stor_device) 649 return; 650 651 /* See storvsc_do_io() -> get_og_chn(). */ 652 spin_lock_irqsave(&stor_device->lock, flags); 653 654 /* 655 * Determines if the storvsc device has other channels assigned to 656 * the "old" CPU to update the alloced_cpus mask and the stor_chns 657 * array. 658 */ 659 if (device->channel != channel && device->channel->target_cpu == old) { 660 cur_chn = device->channel; 661 old_is_alloced = true; 662 goto old_is_alloced; 663 } 664 list_for_each_entry(cur_chn, &device->channel->sc_list, sc_list) { 665 if (cur_chn == channel) 666 continue; 667 if (cur_chn->target_cpu == old) { 668 old_is_alloced = true; 669 goto old_is_alloced; 670 } 671 } 672 673old_is_alloced: 674 if (old_is_alloced) 675 WRITE_ONCE(stor_device->stor_chns[old], cur_chn); 676 else 677 cpumask_clear_cpu(old, &stor_device->alloced_cpus); 678 679 /* "Flush" the stor_chns array. */ 680 for_each_possible_cpu(cpu) { 681 if (stor_device->stor_chns[cpu] && !cpumask_test_cpu( 682 cpu, &stor_device->alloced_cpus)) 683 WRITE_ONCE(stor_device->stor_chns[cpu], NULL); 684 } 685 686 WRITE_ONCE(stor_device->stor_chns[new], channel); 687 cpumask_set_cpu(new, &stor_device->alloced_cpus); 688 689 spin_unlock_irqrestore(&stor_device->lock, flags); 690} 691 692static void handle_sc_creation(struct vmbus_channel *new_sc) 693{ 694 struct hv_device *device = new_sc->primary_channel->device_obj; 695 struct device *dev = &device->device; 696 struct storvsc_device *stor_device; 697 struct vmstorage_channel_properties props; 698 int ret; 699 700 stor_device = get_out_stor_device(device); 701 if (!stor_device) 702 return; 703 704 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 705 706 ret = vmbus_open(new_sc, 707 storvsc_ringbuffer_size, 708 storvsc_ringbuffer_size, 709 (void *)&props, 710 sizeof(struct vmstorage_channel_properties), 711 storvsc_on_channel_callback, new_sc); 712 713 /* In case vmbus_open() fails, we don't use the sub-channel. */ 714 if (ret != 0) { 715 dev_err(dev, "Failed to open sub-channel: err=%d\n", ret); 716 return; 717 } 718 719 new_sc->change_target_cpu_callback = storvsc_change_target_cpu; 720 721 /* Add the sub-channel to the array of available channels. */ 722 stor_device->stor_chns[new_sc->target_cpu] = new_sc; 723 cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); 724} 725 726static void handle_multichannel_storage(struct hv_device *device, int max_chns) 727{ 728 struct device *dev = &device->device; 729 struct storvsc_device *stor_device; 730 int num_sc; 731 struct storvsc_cmd_request *request; 732 struct vstor_packet *vstor_packet; 733 int ret, t; 734 735 /* 736 * If the number of CPUs is artificially restricted, such as 737 * with maxcpus=1 on the kernel boot line, Hyper-V could offer 738 * sub-channels >= the number of CPUs. These sub-channels 739 * should not be created. The primary channel is already created 740 * and assigned to one CPU, so check against # CPUs - 1. 741 */ 742 num_sc = min((int)(num_online_cpus() - 1), max_chns); 743 if (!num_sc) 744 return; 745 746 stor_device = get_out_stor_device(device); 747 if (!stor_device) 748 return; 749 750 stor_device->num_sc = num_sc; 751 request = &stor_device->init_request; 752 vstor_packet = &request->vstor_packet; 753 754 /* 755 * Establish a handler for dealing with subchannels. 756 */ 757 vmbus_set_sc_create_callback(device->channel, handle_sc_creation); 758 759 /* 760 * Request the host to create sub-channels. 761 */ 762 memset(request, 0, sizeof(struct storvsc_cmd_request)); 763 init_completion(&request->wait_event); 764 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; 765 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 766 vstor_packet->sub_channel_count = num_sc; 767 768 ret = vmbus_sendpacket(device->channel, vstor_packet, 769 (sizeof(struct vstor_packet) - 770 vmscsi_size_delta), 771 (unsigned long)request, 772 VM_PKT_DATA_INBAND, 773 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 774 775 if (ret != 0) { 776 dev_err(dev, "Failed to create sub-channel: err=%d\n", ret); 777 return; 778 } 779 780 t = wait_for_completion_timeout(&request->wait_event, 10*HZ); 781 if (t == 0) { 782 dev_err(dev, "Failed to create sub-channel: timed out\n"); 783 return; 784 } 785 786 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 787 vstor_packet->status != 0) { 788 dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n", 789 vstor_packet->operation, vstor_packet->status); 790 return; 791 } 792 793 /* 794 * We need to do nothing here, because vmbus_process_offer() 795 * invokes channel->sc_creation_callback, which will open and use 796 * the sub-channel(s). 797 */ 798} 799 800static void cache_wwn(struct storvsc_device *stor_device, 801 struct vstor_packet *vstor_packet) 802{ 803 /* 804 * Cache the currently active port and node ww names. 805 */ 806 if (vstor_packet->wwn_packet.primary_active) { 807 stor_device->node_name = 808 wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); 809 stor_device->port_name = 810 wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); 811 } else { 812 stor_device->node_name = 813 wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); 814 stor_device->port_name = 815 wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); 816 } 817} 818 819 820static int storvsc_execute_vstor_op(struct hv_device *device, 821 struct storvsc_cmd_request *request, 822 bool status_check) 823{ 824 struct vstor_packet *vstor_packet; 825 int ret, t; 826 827 vstor_packet = &request->vstor_packet; 828 829 init_completion(&request->wait_event); 830 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 831 832 ret = vmbus_sendpacket(device->channel, vstor_packet, 833 (sizeof(struct vstor_packet) - 834 vmscsi_size_delta), 835 (unsigned long)request, 836 VM_PKT_DATA_INBAND, 837 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 838 if (ret != 0) 839 return ret; 840 841 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 842 if (t == 0) 843 return -ETIMEDOUT; 844 845 if (!status_check) 846 return ret; 847 848 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 849 vstor_packet->status != 0) 850 return -EINVAL; 851 852 return ret; 853} 854 855static int storvsc_channel_init(struct hv_device *device, bool is_fc) 856{ 857 struct storvsc_device *stor_device; 858 struct storvsc_cmd_request *request; 859 struct vstor_packet *vstor_packet; 860 int ret, i; 861 int max_chns; 862 bool process_sub_channels = false; 863 864 stor_device = get_out_stor_device(device); 865 if (!stor_device) 866 return -ENODEV; 867 868 request = &stor_device->init_request; 869 vstor_packet = &request->vstor_packet; 870 871 /* 872 * Now, initiate the vsc/vsp initialization protocol on the open 873 * channel 874 */ 875 memset(request, 0, sizeof(struct storvsc_cmd_request)); 876 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 877 ret = storvsc_execute_vstor_op(device, request, true); 878 if (ret) 879 return ret; 880 /* 881 * Query host supported protocol version. 882 */ 883 884 for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { 885 /* reuse the packet for version range supported */ 886 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 887 vstor_packet->operation = 888 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 889 890 vstor_packet->version.major_minor = 891 vmstor_protocols[i].protocol_version; 892 893 /* 894 * The revision number is only used in Windows; set it to 0. 895 */ 896 vstor_packet->version.revision = 0; 897 ret = storvsc_execute_vstor_op(device, request, false); 898 if (ret != 0) 899 return ret; 900 901 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) 902 return -EINVAL; 903 904 if (vstor_packet->status == 0) { 905 vmstor_proto_version = 906 vmstor_protocols[i].protocol_version; 907 908 sense_buffer_size = 909 vmstor_protocols[i].sense_buffer_size; 910 911 vmscsi_size_delta = 912 vmstor_protocols[i].vmscsi_size_delta; 913 914 break; 915 } 916 } 917 918 if (vstor_packet->status != 0) 919 return -EINVAL; 920 921 922 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 923 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 924 ret = storvsc_execute_vstor_op(device, request, true); 925 if (ret != 0) 926 return ret; 927 928 /* 929 * Check to see if multi-channel support is there. 930 * Hosts that implement protocol version of 5.1 and above 931 * support multi-channel. 932 */ 933 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; 934 935 /* 936 * Allocate state to manage the sub-channels. 937 * We allocate an array based on the numbers of possible CPUs 938 * (Hyper-V does not support cpu online/offline). 939 * This Array will be sparseley populated with unique 940 * channels - primary + sub-channels. 941 * We will however populate all the slots to evenly distribute 942 * the load. 943 */ 944 stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), 945 GFP_KERNEL); 946 if (stor_device->stor_chns == NULL) 947 return -ENOMEM; 948 949 device->channel->change_target_cpu_callback = storvsc_change_target_cpu; 950 951 stor_device->stor_chns[device->channel->target_cpu] = device->channel; 952 cpumask_set_cpu(device->channel->target_cpu, 953 &stor_device->alloced_cpus); 954 955 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { 956 if (vstor_packet->storage_channel_properties.flags & 957 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) 958 process_sub_channels = true; 959 } 960 stor_device->max_transfer_bytes = 961 vstor_packet->storage_channel_properties.max_transfer_bytes; 962 963 if (!is_fc) 964 goto done; 965 966 /* 967 * For FC devices retrieve FC HBA data. 968 */ 969 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 970 vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; 971 ret = storvsc_execute_vstor_op(device, request, true); 972 if (ret != 0) 973 return ret; 974 975 /* 976 * Cache the currently active port and node ww names. 977 */ 978 cache_wwn(stor_device, vstor_packet); 979 980done: 981 982 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 983 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 984 ret = storvsc_execute_vstor_op(device, request, true); 985 if (ret != 0) 986 return ret; 987 988 if (process_sub_channels) 989 handle_multichannel_storage(device, max_chns); 990 991 return ret; 992} 993 994static void storvsc_handle_error(struct vmscsi_request *vm_srb, 995 struct scsi_cmnd *scmnd, 996 struct Scsi_Host *host, 997 u8 asc, u8 ascq) 998{ 999 struct storvsc_scan_work *wrk; 1000 void (*process_err_fn)(struct work_struct *work); 1001 struct hv_host_device *host_dev = shost_priv(host); 1002 1003 switch (SRB_STATUS(vm_srb->srb_status)) { 1004 case SRB_STATUS_ERROR: 1005 case SRB_STATUS_ABORTED: 1006 case SRB_STATUS_INVALID_REQUEST: 1007 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) { 1008 /* Check for capacity change */ 1009 if ((asc == 0x2a) && (ascq == 0x9)) { 1010 process_err_fn = storvsc_device_scan; 1011 /* Retry the I/O that triggered this. */ 1012 set_host_byte(scmnd, DID_REQUEUE); 1013 goto do_work; 1014 } 1015 1016 /* 1017 * Check for "Operating parameters have changed" 1018 * due to Hyper-V changing the VHD/VHDX BlockSize 1019 * when adding/removing a differencing disk. This 1020 * causes discard_granularity to change, so do a 1021 * rescan to pick up the new granularity. We don't 1022 * want scsi_report_sense() to output a message 1023 * that a sysadmin wouldn't know what to do with. 1024 */ 1025 if ((asc == 0x3f) && (ascq != 0x03) && 1026 (ascq != 0x0e)) { 1027 process_err_fn = storvsc_device_scan; 1028 set_host_byte(scmnd, DID_REQUEUE); 1029 goto do_work; 1030 } 1031 1032 /* 1033 * Otherwise, let upper layer deal with the 1034 * error when sense message is present 1035 */ 1036 return; 1037 } 1038 1039 /* 1040 * If there is an error; offline the device since all 1041 * error recovery strategies would have already been 1042 * deployed on the host side. However, if the command 1043 * were a pass-through command deal with it appropriately. 1044 */ 1045 switch (scmnd->cmnd[0]) { 1046 case ATA_16: 1047 case ATA_12: 1048 set_host_byte(scmnd, DID_PASSTHROUGH); 1049 break; 1050 /* 1051 * On some Hyper-V hosts TEST_UNIT_READY command can 1052 * return SRB_STATUS_ERROR. Let the upper level code 1053 * deal with it based on the sense information. 1054 */ 1055 case TEST_UNIT_READY: 1056 break; 1057 default: 1058 set_host_byte(scmnd, DID_ERROR); 1059 } 1060 return; 1061 1062 case SRB_STATUS_INVALID_LUN: 1063 set_host_byte(scmnd, DID_NO_CONNECT); 1064 process_err_fn = storvsc_remove_lun; 1065 goto do_work; 1066 1067 } 1068 return; 1069 1070do_work: 1071 /* 1072 * We need to schedule work to process this error; schedule it. 1073 */ 1074 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1075 if (!wrk) { 1076 set_host_byte(scmnd, DID_TARGET_FAILURE); 1077 return; 1078 } 1079 1080 wrk->host = host; 1081 wrk->lun = vm_srb->lun; 1082 wrk->tgt_id = vm_srb->target_id; 1083 INIT_WORK(&wrk->work, process_err_fn); 1084 queue_work(host_dev->handle_error_wq, &wrk->work); 1085} 1086 1087 1088static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, 1089 struct storvsc_device *stor_dev) 1090{ 1091 struct scsi_cmnd *scmnd = cmd_request->cmd; 1092 struct scsi_sense_hdr sense_hdr; 1093 struct vmscsi_request *vm_srb; 1094 u32 data_transfer_length; 1095 struct Scsi_Host *host; 1096 u32 payload_sz = cmd_request->payload_sz; 1097 void *payload = cmd_request->payload; 1098 1099 host = stor_dev->host; 1100 1101 vm_srb = &cmd_request->vstor_packet.vm_srb; 1102 data_transfer_length = vm_srb->data_transfer_length; 1103 1104 scmnd->result = vm_srb->scsi_status; 1105 1106 if (scmnd->result) { 1107 if (scsi_normalize_sense(scmnd->sense_buffer, 1108 SCSI_SENSE_BUFFERSIZE, &sense_hdr) && 1109 !(sense_hdr.sense_key == NOT_READY && 1110 sense_hdr.asc == 0x03A) && 1111 do_logging(STORVSC_LOGGING_ERROR)) 1112 scsi_print_sense_hdr(scmnd->device, "storvsc", 1113 &sense_hdr); 1114 } 1115 1116 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { 1117 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 1118 sense_hdr.ascq); 1119 /* 1120 * The Windows driver set data_transfer_length on 1121 * SRB_STATUS_DATA_OVERRUN. On other errors, this value 1122 * is untouched. In these cases we set it to 0. 1123 */ 1124 if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) 1125 data_transfer_length = 0; 1126 } 1127 1128 /* Validate data_transfer_length (from Hyper-V) */ 1129 if (data_transfer_length > cmd_request->payload->range.len) 1130 data_transfer_length = cmd_request->payload->range.len; 1131 1132 scsi_set_resid(scmnd, 1133 cmd_request->payload->range.len - data_transfer_length); 1134 1135 scmnd->scsi_done(scmnd); 1136 1137 if (payload_sz > 1138 sizeof(struct vmbus_channel_packet_multipage_buffer)) 1139 kfree(payload); 1140} 1141 1142static void storvsc_on_io_completion(struct storvsc_device *stor_device, 1143 struct vstor_packet *vstor_packet, 1144 struct storvsc_cmd_request *request) 1145{ 1146 struct vstor_packet *stor_pkt; 1147 struct hv_device *device = stor_device->device; 1148 1149 stor_pkt = &request->vstor_packet; 1150 1151 /* 1152 * The current SCSI handling on the host side does 1153 * not correctly handle: 1154 * INQUIRY command with page code parameter set to 0x80 1155 * MODE_SENSE command with cmd[2] == 0x1c 1156 * 1157 * Setup srb and scsi status so this won't be fatal. 1158 * We do this so we can distinguish truly fatal failues 1159 * (srb status == 0x4) and off-line the device in that case. 1160 */ 1161 1162 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 1163 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 1164 vstor_packet->vm_srb.scsi_status = 0; 1165 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 1166 } 1167 1168 1169 /* Copy over the status...etc */ 1170 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 1171 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 1172 1173 /* Validate sense_info_length (from Hyper-V) */ 1174 if (vstor_packet->vm_srb.sense_info_length > sense_buffer_size) 1175 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1176 1177 stor_pkt->vm_srb.sense_info_length = 1178 vstor_packet->vm_srb.sense_info_length; 1179 1180 if (vstor_packet->vm_srb.scsi_status != 0 || 1181 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) 1182 storvsc_log(device, STORVSC_LOGGING_WARN, 1183 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 1184 stor_pkt->vm_srb.cdb[0], 1185 vstor_packet->vm_srb.scsi_status, 1186 vstor_packet->vm_srb.srb_status); 1187 1188 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1189 /* CHECK_CONDITION */ 1190 if (vstor_packet->vm_srb.srb_status & 1191 SRB_STATUS_AUTOSENSE_VALID) { 1192 /* autosense data available */ 1193 1194 storvsc_log(device, STORVSC_LOGGING_WARN, 1195 "stor pkt %p autosense data valid - len %d\n", 1196 request, vstor_packet->vm_srb.sense_info_length); 1197 1198 memcpy(request->cmd->sense_buffer, 1199 vstor_packet->vm_srb.sense_data, 1200 vstor_packet->vm_srb.sense_info_length); 1201 1202 } 1203 } 1204 1205 stor_pkt->vm_srb.data_transfer_length = 1206 vstor_packet->vm_srb.data_transfer_length; 1207 1208 storvsc_command_completion(request, stor_device); 1209 1210 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1211 stor_device->drain_notify) 1212 wake_up(&stor_device->waiting_to_drain); 1213 1214 1215} 1216 1217static void storvsc_on_receive(struct storvsc_device *stor_device, 1218 struct vstor_packet *vstor_packet, 1219 struct storvsc_cmd_request *request) 1220{ 1221 struct hv_host_device *host_dev; 1222 switch (vstor_packet->operation) { 1223 case VSTOR_OPERATION_COMPLETE_IO: 1224 storvsc_on_io_completion(stor_device, vstor_packet, request); 1225 break; 1226 1227 case VSTOR_OPERATION_REMOVE_DEVICE: 1228 case VSTOR_OPERATION_ENUMERATE_BUS: 1229 host_dev = shost_priv(stor_device->host); 1230 queue_work( 1231 host_dev->handle_error_wq, &host_dev->host_scan_work); 1232 break; 1233 1234 case VSTOR_OPERATION_FCHBA_DATA: 1235 cache_wwn(stor_device, vstor_packet); 1236#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1237 fc_host_node_name(stor_device->host) = stor_device->node_name; 1238 fc_host_port_name(stor_device->host) = stor_device->port_name; 1239#endif 1240 break; 1241 default: 1242 break; 1243 } 1244} 1245 1246static void storvsc_on_channel_callback(void *context) 1247{ 1248 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1249 const struct vmpacket_descriptor *desc; 1250 struct hv_device *device; 1251 struct storvsc_device *stor_device; 1252 1253 if (channel->primary_channel != NULL) 1254 device = channel->primary_channel->device_obj; 1255 else 1256 device = channel->device_obj; 1257 1258 stor_device = get_in_stor_device(device); 1259 if (!stor_device) 1260 return; 1261 1262 foreach_vmbus_pkt(desc, channel) { 1263 void *packet = hv_pkt_data(desc); 1264 struct storvsc_cmd_request *request; 1265 1266 request = (struct storvsc_cmd_request *) 1267 ((unsigned long)desc->trans_id); 1268 1269 if (request == &stor_device->init_request || 1270 request == &stor_device->reset_request) { 1271 memcpy(&request->vstor_packet, packet, 1272 (sizeof(struct vstor_packet) - vmscsi_size_delta)); 1273 complete(&request->wait_event); 1274 } else { 1275 storvsc_on_receive(stor_device, packet, request); 1276 } 1277 } 1278} 1279 1280static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, 1281 bool is_fc) 1282{ 1283 struct vmstorage_channel_properties props; 1284 int ret; 1285 1286 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1287 1288 ret = vmbus_open(device->channel, 1289 ring_size, 1290 ring_size, 1291 (void *)&props, 1292 sizeof(struct vmstorage_channel_properties), 1293 storvsc_on_channel_callback, device->channel); 1294 1295 if (ret != 0) 1296 return ret; 1297 1298 ret = storvsc_channel_init(device, is_fc); 1299 1300 return ret; 1301} 1302 1303static int storvsc_dev_remove(struct hv_device *device) 1304{ 1305 struct storvsc_device *stor_device; 1306 1307 stor_device = hv_get_drvdata(device); 1308 1309 stor_device->destroy = true; 1310 1311 /* Make sure flag is set before waiting */ 1312 wmb(); 1313 1314 /* 1315 * At this point, all outbound traffic should be disable. We 1316 * only allow inbound traffic (responses) to proceed so that 1317 * outstanding requests can be completed. 1318 */ 1319 1320 storvsc_wait_to_drain(stor_device); 1321 1322 /* 1323 * Since we have already drained, we don't need to busy wait 1324 * as was done in final_release_stor_device() 1325 * Note that we cannot set the ext pointer to NULL until 1326 * we have drained - to drain the outgoing packets, we need to 1327 * allow incoming packets. 1328 */ 1329 hv_set_drvdata(device, NULL); 1330 1331 /* Close the channel */ 1332 vmbus_close(device->channel); 1333 1334 kfree(stor_device->stor_chns); 1335 kfree(stor_device); 1336 return 0; 1337} 1338 1339static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, 1340 u16 q_num) 1341{ 1342 u16 slot = 0; 1343 u16 hash_qnum; 1344 const struct cpumask *node_mask; 1345 int num_channels, tgt_cpu; 1346 1347 if (stor_device->num_sc == 0) { 1348 stor_device->stor_chns[q_num] = stor_device->device->channel; 1349 return stor_device->device->channel; 1350 } 1351 1352 /* 1353 * Our channel array is sparsley populated and we 1354 * initiated I/O on a processor/hw-q that does not 1355 * currently have a designated channel. Fix this. 1356 * The strategy is simple: 1357 * I. Ensure NUMA locality 1358 * II. Distribute evenly (best effort) 1359 */ 1360 1361 node_mask = cpumask_of_node(cpu_to_node(q_num)); 1362 1363 num_channels = 0; 1364 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1365 if (cpumask_test_cpu(tgt_cpu, node_mask)) 1366 num_channels++; 1367 } 1368 if (num_channels == 0) { 1369 stor_device->stor_chns[q_num] = stor_device->device->channel; 1370 return stor_device->device->channel; 1371 } 1372 1373 hash_qnum = q_num; 1374 while (hash_qnum >= num_channels) 1375 hash_qnum -= num_channels; 1376 1377 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1378 if (!cpumask_test_cpu(tgt_cpu, node_mask)) 1379 continue; 1380 if (slot == hash_qnum) 1381 break; 1382 slot++; 1383 } 1384 1385 stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; 1386 1387 return stor_device->stor_chns[q_num]; 1388} 1389 1390 1391static int storvsc_do_io(struct hv_device *device, 1392 struct storvsc_cmd_request *request, u16 q_num) 1393{ 1394 struct storvsc_device *stor_device; 1395 struct vstor_packet *vstor_packet; 1396 struct vmbus_channel *outgoing_channel, *channel; 1397 unsigned long flags; 1398 int ret = 0; 1399 const struct cpumask *node_mask; 1400 int tgt_cpu; 1401 1402 vstor_packet = &request->vstor_packet; 1403 stor_device = get_out_stor_device(device); 1404 1405 if (!stor_device) 1406 return -ENODEV; 1407 1408 1409 request->device = device; 1410 /* 1411 * Select an appropriate channel to send the request out. 1412 */ 1413 /* See storvsc_change_target_cpu(). */ 1414 outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]); 1415 if (outgoing_channel != NULL) { 1416 if (outgoing_channel->target_cpu == q_num) { 1417 /* 1418 * Ideally, we want to pick a different channel if 1419 * available on the same NUMA node. 1420 */ 1421 node_mask = cpumask_of_node(cpu_to_node(q_num)); 1422 for_each_cpu_wrap(tgt_cpu, 1423 &stor_device->alloced_cpus, q_num + 1) { 1424 if (!cpumask_test_cpu(tgt_cpu, node_mask)) 1425 continue; 1426 if (tgt_cpu == q_num) 1427 continue; 1428 channel = READ_ONCE( 1429 stor_device->stor_chns[tgt_cpu]); 1430 if (channel == NULL) 1431 continue; 1432 if (hv_get_avail_to_write_percent( 1433 &channel->outbound) 1434 > ring_avail_percent_lowater) { 1435 outgoing_channel = channel; 1436 goto found_channel; 1437 } 1438 } 1439 1440 /* 1441 * All the other channels on the same NUMA node are 1442 * busy. Try to use the channel on the current CPU 1443 */ 1444 if (hv_get_avail_to_write_percent( 1445 &outgoing_channel->outbound) 1446 > ring_avail_percent_lowater) 1447 goto found_channel; 1448 1449 /* 1450 * If we reach here, all the channels on the current 1451 * NUMA node are busy. Try to find a channel in 1452 * other NUMA nodes 1453 */ 1454 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1455 if (cpumask_test_cpu(tgt_cpu, node_mask)) 1456 continue; 1457 channel = READ_ONCE( 1458 stor_device->stor_chns[tgt_cpu]); 1459 if (channel == NULL) 1460 continue; 1461 if (hv_get_avail_to_write_percent( 1462 &channel->outbound) 1463 > ring_avail_percent_lowater) { 1464 outgoing_channel = channel; 1465 goto found_channel; 1466 } 1467 } 1468 } 1469 } else { 1470 spin_lock_irqsave(&stor_device->lock, flags); 1471 outgoing_channel = stor_device->stor_chns[q_num]; 1472 if (outgoing_channel != NULL) { 1473 spin_unlock_irqrestore(&stor_device->lock, flags); 1474 goto found_channel; 1475 } 1476 outgoing_channel = get_og_chn(stor_device, q_num); 1477 spin_unlock_irqrestore(&stor_device->lock, flags); 1478 } 1479 1480found_channel: 1481 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1482 1483 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1484 vmscsi_size_delta); 1485 1486 1487 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1488 1489 1490 vstor_packet->vm_srb.data_transfer_length = 1491 request->payload->range.len; 1492 1493 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1494 1495 if (request->payload->range.len) { 1496 1497 ret = vmbus_sendpacket_mpb_desc(outgoing_channel, 1498 request->payload, request->payload_sz, 1499 vstor_packet, 1500 (sizeof(struct vstor_packet) - 1501 vmscsi_size_delta), 1502 (unsigned long)request); 1503 } else { 1504 ret = vmbus_sendpacket(outgoing_channel, vstor_packet, 1505 (sizeof(struct vstor_packet) - 1506 vmscsi_size_delta), 1507 (unsigned long)request, 1508 VM_PKT_DATA_INBAND, 1509 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1510 } 1511 1512 if (ret != 0) 1513 return ret; 1514 1515 atomic_inc(&stor_device->num_outstanding_req); 1516 1517 return ret; 1518} 1519 1520static int storvsc_device_alloc(struct scsi_device *sdevice) 1521{ 1522 /* 1523 * Set blist flag to permit the reading of the VPD pages even when 1524 * the target may claim SPC-2 compliance. MSFT targets currently 1525 * claim SPC-2 compliance while they implement post SPC-2 features. 1526 * With this flag we can correctly handle WRITE_SAME_16 issues. 1527 * 1528 * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but 1529 * still supports REPORT LUN. 1530 */ 1531 sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; 1532 1533 return 0; 1534} 1535 1536static int storvsc_device_configure(struct scsi_device *sdevice) 1537{ 1538 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1539 1540 /* storvsc devices don't support MAINTENANCE_IN SCSI cmd */ 1541 sdevice->no_report_opcodes = 1; 1542 sdevice->no_write_same = 1; 1543 1544 /* 1545 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 1546 * if the device is a MSFT virtual device. If the host is 1547 * WIN10 or newer, allow write_same. 1548 */ 1549 if (!strncmp(sdevice->vendor, "Msft", 4)) { 1550 switch (vmstor_proto_version) { 1551 case VMSTOR_PROTO_VERSION_WIN8: 1552 case VMSTOR_PROTO_VERSION_WIN8_1: 1553 sdevice->scsi_level = SCSI_SPC_3; 1554 break; 1555 } 1556 1557 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) 1558 sdevice->no_write_same = 0; 1559 } 1560 1561 return 0; 1562} 1563 1564static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1565 sector_t capacity, int *info) 1566{ 1567 sector_t nsect = capacity; 1568 sector_t cylinders = nsect; 1569 int heads, sectors_pt; 1570 1571 /* 1572 * We are making up these values; let us keep it simple. 1573 */ 1574 heads = 0xff; 1575 sectors_pt = 0x3f; /* Sectors per track */ 1576 sector_div(cylinders, heads * sectors_pt); 1577 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1578 cylinders = 0xffff; 1579 1580 info[0] = heads; 1581 info[1] = sectors_pt; 1582 info[2] = (int)cylinders; 1583 1584 return 0; 1585} 1586 1587static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1588{ 1589 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1590 struct hv_device *device = host_dev->dev; 1591 1592 struct storvsc_device *stor_device; 1593 struct storvsc_cmd_request *request; 1594 struct vstor_packet *vstor_packet; 1595 int ret, t; 1596 1597 1598 stor_device = get_out_stor_device(device); 1599 if (!stor_device) 1600 return FAILED; 1601 1602 request = &stor_device->reset_request; 1603 vstor_packet = &request->vstor_packet; 1604 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 1605 1606 init_completion(&request->wait_event); 1607 1608 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1609 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1610 vstor_packet->vm_srb.path_id = stor_device->path_id; 1611 1612 ret = vmbus_sendpacket(device->channel, vstor_packet, 1613 (sizeof(struct vstor_packet) - 1614 vmscsi_size_delta), 1615 (unsigned long)&stor_device->reset_request, 1616 VM_PKT_DATA_INBAND, 1617 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1618 if (ret != 0) 1619 return FAILED; 1620 1621 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1622 if (t == 0) 1623 return TIMEOUT_ERROR; 1624 1625 1626 /* 1627 * At this point, all outstanding requests in the adapter 1628 * should have been flushed out and return to us 1629 * There is a potential race here where the host may be in 1630 * the process of responding when we return from here. 1631 * Just wait for all in-transit packets to be accounted for 1632 * before we return from here. 1633 */ 1634 storvsc_wait_to_drain(stor_device); 1635 1636 return SUCCESS; 1637} 1638 1639/* 1640 * The host guarantees to respond to each command, although I/O latencies might 1641 * be unbounded on Azure. Reset the timer unconditionally to give the host a 1642 * chance to perform EH. 1643 */ 1644static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) 1645{ 1646 return BLK_EH_RESET_TIMER; 1647} 1648 1649static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1650{ 1651 bool allowed = true; 1652 u8 scsi_op = scmnd->cmnd[0]; 1653 1654 switch (scsi_op) { 1655 /* the host does not handle WRITE_SAME, log accident usage */ 1656 case WRITE_SAME: 1657 /* 1658 * smartd sends this command and the host does not handle 1659 * this. So, don't send it. 1660 */ 1661 case SET_WINDOW: 1662 scmnd->result = ILLEGAL_REQUEST << 16; 1663 allowed = false; 1664 break; 1665 default: 1666 break; 1667 } 1668 return allowed; 1669} 1670 1671static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1672{ 1673 int ret; 1674 struct hv_host_device *host_dev = shost_priv(host); 1675 struct hv_device *dev = host_dev->dev; 1676 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); 1677 int i; 1678 struct scatterlist *sgl; 1679 unsigned int sg_count = 0; 1680 struct vmscsi_request *vm_srb; 1681 struct scatterlist *cur_sgl; 1682 struct vmbus_packet_mpb_array *payload; 1683 u32 payload_sz; 1684 u32 length; 1685 1686 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { 1687 /* 1688 * On legacy hosts filter unimplemented commands. 1689 * Future hosts are expected to correctly handle 1690 * unsupported commands. Furthermore, it is 1691 * possible that some of the currently 1692 * unsupported commands maybe supported in 1693 * future versions of the host. 1694 */ 1695 if (!storvsc_scsi_cmd_ok(scmnd)) { 1696 scmnd->scsi_done(scmnd); 1697 return 0; 1698 } 1699 } 1700 1701 /* Setup the cmd request */ 1702 cmd_request->cmd = scmnd; 1703 1704 memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet)); 1705 vm_srb = &cmd_request->vstor_packet.vm_srb; 1706 vm_srb->win8_extension.time_out_value = 60; 1707 1708 vm_srb->win8_extension.srb_flags |= 1709 SRB_FLAGS_DISABLE_SYNCH_TRANSFER; 1710 1711 if (scmnd->device->tagged_supported) { 1712 vm_srb->win8_extension.srb_flags |= 1713 (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); 1714 vm_srb->win8_extension.queue_tag = SP_UNTAGGED; 1715 vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; 1716 } 1717 1718 /* Build the SRB */ 1719 switch (scmnd->sc_data_direction) { 1720 case DMA_TO_DEVICE: 1721 vm_srb->data_in = WRITE_TYPE; 1722 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1723 break; 1724 case DMA_FROM_DEVICE: 1725 vm_srb->data_in = READ_TYPE; 1726 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1727 break; 1728 case DMA_NONE: 1729 vm_srb->data_in = UNKNOWN_TYPE; 1730 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; 1731 break; 1732 default: 1733 /* 1734 * This is DMA_BIDIRECTIONAL or something else we are never 1735 * supposed to see here. 1736 */ 1737 WARN(1, "Unexpected data direction: %d\n", 1738 scmnd->sc_data_direction); 1739 return -EINVAL; 1740 } 1741 1742 1743 vm_srb->port_number = host_dev->port; 1744 vm_srb->path_id = scmnd->device->channel; 1745 vm_srb->target_id = scmnd->device->id; 1746 vm_srb->lun = scmnd->device->lun; 1747 1748 vm_srb->cdb_length = scmnd->cmd_len; 1749 1750 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1751 1752 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1753 sg_count = scsi_sg_count(scmnd); 1754 1755 length = scsi_bufflen(scmnd); 1756 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; 1757 payload_sz = 0; 1758 1759 if (sg_count) { 1760 unsigned int hvpgoff = 0; 1761 unsigned long offset_in_hvpg = sgl->offset & ~HV_HYP_PAGE_MASK; 1762 unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); 1763 u64 hvpfn; 1764 1765 payload_sz = (hvpg_count * sizeof(u64) + 1766 sizeof(struct vmbus_packet_mpb_array)); 1767 1768 if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { 1769 payload = kzalloc(payload_sz, GFP_ATOMIC); 1770 if (!payload) 1771 return SCSI_MLQUEUE_DEVICE_BUSY; 1772 } 1773 1774 /* 1775 * sgl is a list of PAGEs, and payload->range.pfn_array 1776 * expects the page number in the unit of HV_HYP_PAGE_SIZE (the 1777 * page size that Hyper-V uses, so here we need to divide PAGEs 1778 * into HV_HYP_PAGE in case that PAGE_SIZE > HV_HYP_PAGE_SIZE. 1779 * Besides, payload->range.offset should be the offset in one 1780 * HV_HYP_PAGE. 1781 */ 1782 payload->range.len = length; 1783 payload->range.offset = offset_in_hvpg; 1784 hvpgoff = sgl->offset >> HV_HYP_PAGE_SHIFT; 1785 1786 cur_sgl = sgl; 1787 for (i = 0; i < hvpg_count; i++) { 1788 /* 1789 * 'i' is the index of hv pages in the payload and 1790 * 'hvpgoff' is the offset (in hv pages) of the first 1791 * hv page in the the first page. The relationship 1792 * between the sum of 'i' and 'hvpgoff' and the offset 1793 * (in hv pages) in a payload page ('hvpgoff_in_page') 1794 * is as follow: 1795 * 1796 * |------------------ PAGE -------------------| 1797 * | NR_HV_HYP_PAGES_IN_PAGE hvpgs in total | 1798 * |hvpg|hvpg| ... |hvpg|... |hvpg| 1799 * ^ ^ ^ ^ 1800 * +-hvpgoff-+ +-hvpgoff_in_page-+ 1801 * ^ | 1802 * +--------------------- i ---------------------------+ 1803 */ 1804 unsigned int hvpgoff_in_page = 1805 (i + hvpgoff) % NR_HV_HYP_PAGES_IN_PAGE; 1806 1807 /* 1808 * Two cases that we need to fetch a page: 1809 * 1) i == 0, the first step or 1810 * 2) hvpgoff_in_page == 0, when we reach the boundary 1811 * of a page. 1812 */ 1813 if (hvpgoff_in_page == 0 || i == 0) { 1814 hvpfn = page_to_hvpfn(sg_page(cur_sgl)); 1815 cur_sgl = sg_next(cur_sgl); 1816 } 1817 1818 payload->range.pfn_array[i] = hvpfn + hvpgoff_in_page; 1819 } 1820 } 1821 1822 cmd_request->payload = payload; 1823 cmd_request->payload_sz = payload_sz; 1824 1825 /* Invokes the vsc to start an IO */ 1826 ret = storvsc_do_io(dev, cmd_request, get_cpu()); 1827 put_cpu(); 1828 1829 if (ret == -EAGAIN) { 1830 if (payload_sz > sizeof(cmd_request->mpb)) 1831 kfree(payload); 1832 /* no more space */ 1833 return SCSI_MLQUEUE_DEVICE_BUSY; 1834 } 1835 1836 return 0; 1837} 1838 1839static struct scsi_host_template scsi_driver = { 1840 .module = THIS_MODULE, 1841 .name = "storvsc_host_t", 1842 .cmd_size = sizeof(struct storvsc_cmd_request), 1843 .bios_param = storvsc_get_chs, 1844 .queuecommand = storvsc_queuecommand, 1845 .eh_host_reset_handler = storvsc_host_reset_handler, 1846 .proc_name = "storvsc_host", 1847 .eh_timed_out = storvsc_eh_timed_out, 1848 .slave_alloc = storvsc_device_alloc, 1849 .slave_configure = storvsc_device_configure, 1850 .cmd_per_lun = 2048, 1851 .this_id = -1, 1852 /* Make sure we dont get a sg segment crosses a page boundary */ 1853 .dma_boundary = PAGE_SIZE-1, 1854 /* Ensure there are no gaps in presented sgls */ 1855 .virt_boundary_mask = PAGE_SIZE-1, 1856 .no_write_same = 1, 1857 .track_queue_depth = 1, 1858 .change_queue_depth = storvsc_change_queue_depth, 1859}; 1860 1861enum { 1862 SCSI_GUID, 1863 IDE_GUID, 1864 SFC_GUID, 1865}; 1866 1867static const struct hv_vmbus_device_id id_table[] = { 1868 /* SCSI guid */ 1869 { HV_SCSI_GUID, 1870 .driver_data = SCSI_GUID 1871 }, 1872 /* IDE guid */ 1873 { HV_IDE_GUID, 1874 .driver_data = IDE_GUID 1875 }, 1876 /* Fibre Channel GUID */ 1877 { 1878 HV_SYNTHFC_GUID, 1879 .driver_data = SFC_GUID 1880 }, 1881 { }, 1882}; 1883 1884MODULE_DEVICE_TABLE(vmbus, id_table); 1885 1886static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID }; 1887 1888static bool hv_dev_is_fc(struct hv_device *hv_dev) 1889{ 1890 return guid_equal(&fc_guid.guid, &hv_dev->dev_type); 1891} 1892 1893static int storvsc_probe(struct hv_device *device, 1894 const struct hv_vmbus_device_id *dev_id) 1895{ 1896 int ret; 1897 int num_cpus = num_online_cpus(); 1898 struct Scsi_Host *host; 1899 struct hv_host_device *host_dev; 1900 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1901 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); 1902 int target = 0; 1903 struct storvsc_device *stor_device; 1904 int max_luns_per_target; 1905 int max_targets; 1906 int max_channels; 1907 int max_sub_channels = 0; 1908 1909 /* 1910 * Based on the windows host we are running on, 1911 * set state to properly communicate with the host. 1912 */ 1913 1914 if (vmbus_proto_version < VERSION_WIN8) { 1915 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1916 max_targets = STORVSC_IDE_MAX_TARGETS; 1917 max_channels = STORVSC_IDE_MAX_CHANNELS; 1918 } else { 1919 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; 1920 max_targets = STORVSC_MAX_TARGETS; 1921 max_channels = STORVSC_MAX_CHANNELS; 1922 /* 1923 * On Windows8 and above, we support sub-channels for storage 1924 * on SCSI and FC controllers. 1925 * The number of sub-channels offerred is based on the number of 1926 * VCPUs in the guest. 1927 */ 1928 if (!dev_is_ide) 1929 max_sub_channels = 1930 (num_cpus - 1) / storvsc_vcpus_per_sub_channel; 1931 } 1932 1933 scsi_driver.can_queue = max_outstanding_req_per_channel * 1934 (max_sub_channels + 1) * 1935 (100 - ring_avail_percent_lowater) / 100; 1936 1937 host = scsi_host_alloc(&scsi_driver, 1938 sizeof(struct hv_host_device)); 1939 if (!host) 1940 return -ENOMEM; 1941 1942 host_dev = shost_priv(host); 1943 memset(host_dev, 0, sizeof(struct hv_host_device)); 1944 1945 host_dev->port = host->host_no; 1946 host_dev->dev = device; 1947 host_dev->host = host; 1948 1949 1950 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1951 if (!stor_device) { 1952 ret = -ENOMEM; 1953 goto err_out0; 1954 } 1955 1956 stor_device->destroy = false; 1957 init_waitqueue_head(&stor_device->waiting_to_drain); 1958 stor_device->device = device; 1959 stor_device->host = host; 1960 spin_lock_init(&stor_device->lock); 1961 hv_set_drvdata(device, stor_device); 1962 1963 stor_device->port_number = host->host_no; 1964 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); 1965 if (ret) 1966 goto err_out1; 1967 1968 host_dev->path = stor_device->path_id; 1969 host_dev->target = stor_device->target_id; 1970 1971 switch (dev_id->driver_data) { 1972 case SFC_GUID: 1973 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; 1974 host->max_id = STORVSC_FC_MAX_TARGETS; 1975 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; 1976#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1977 host->transportt = fc_transport_template; 1978#endif 1979 break; 1980 1981 case SCSI_GUID: 1982 host->max_lun = max_luns_per_target; 1983 host->max_id = max_targets; 1984 host->max_channel = max_channels - 1; 1985 break; 1986 1987 default: 1988 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1989 host->max_id = STORVSC_IDE_MAX_TARGETS; 1990 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; 1991 break; 1992 } 1993 /* max cmd length */ 1994 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1995 1996 /* 1997 * set the table size based on the info we got 1998 * from the host. 1999 */ 2000 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); 2001 /* 2002 * For non-IDE disks, the host supports multiple channels. 2003 * Set the number of HW queues we are supporting. 2004 */ 2005 if (!dev_is_ide) 2006 host->nr_hw_queues = num_present_cpus(); 2007 2008 /* 2009 * Set the error handler work queue. 2010 */ 2011 host_dev->handle_error_wq = 2012 alloc_ordered_workqueue("storvsc_error_wq_%d", 2013 0, 2014 host->host_no); 2015 if (!host_dev->handle_error_wq) { 2016 ret = -ENOMEM; 2017 goto err_out2; 2018 } 2019 INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); 2020 /* Register the HBA and start the scsi bus scan */ 2021 ret = scsi_add_host(host, &device->device); 2022 if (ret != 0) 2023 goto err_out3; 2024 2025 if (!dev_is_ide) { 2026 scsi_scan_host(host); 2027 } else { 2028 target = (device->dev_instance.b[5] << 8 | 2029 device->dev_instance.b[4]); 2030 ret = scsi_add_device(host, 0, target, 0); 2031 if (ret) 2032 goto err_out4; 2033 } 2034#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2035 if (host->transportt == fc_transport_template) { 2036 struct fc_rport_identifiers ids = { 2037 .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, 2038 }; 2039 2040 fc_host_node_name(host) = stor_device->node_name; 2041 fc_host_port_name(host) = stor_device->port_name; 2042 stor_device->rport = fc_remote_port_add(host, 0, &ids); 2043 if (!stor_device->rport) { 2044 ret = -ENOMEM; 2045 goto err_out4; 2046 } 2047 } 2048#endif 2049 return 0; 2050 2051err_out4: 2052 scsi_remove_host(host); 2053 2054err_out3: 2055 destroy_workqueue(host_dev->handle_error_wq); 2056 2057err_out2: 2058 /* 2059 * Once we have connected with the host, we would need to 2060 * to invoke storvsc_dev_remove() to rollback this state and 2061 * this call also frees up the stor_device; hence the jump around 2062 * err_out1 label. 2063 */ 2064 storvsc_dev_remove(device); 2065 goto err_out0; 2066 2067err_out1: 2068 kfree(stor_device->stor_chns); 2069 kfree(stor_device); 2070 2071err_out0: 2072 scsi_host_put(host); 2073 return ret; 2074} 2075 2076/* Change a scsi target's queue depth */ 2077static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth) 2078{ 2079 if (queue_depth > scsi_driver.can_queue) 2080 queue_depth = scsi_driver.can_queue; 2081 2082 return scsi_change_queue_depth(sdev, queue_depth); 2083} 2084 2085static int storvsc_remove(struct hv_device *dev) 2086{ 2087 struct storvsc_device *stor_device = hv_get_drvdata(dev); 2088 struct Scsi_Host *host = stor_device->host; 2089 struct hv_host_device *host_dev = shost_priv(host); 2090 2091#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2092 if (host->transportt == fc_transport_template) { 2093 fc_remote_port_delete(stor_device->rport); 2094 fc_remove_host(host); 2095 } 2096#endif 2097 destroy_workqueue(host_dev->handle_error_wq); 2098 scsi_remove_host(host); 2099 storvsc_dev_remove(dev); 2100 scsi_host_put(host); 2101 2102 return 0; 2103} 2104 2105static int storvsc_suspend(struct hv_device *hv_dev) 2106{ 2107 struct storvsc_device *stor_device = hv_get_drvdata(hv_dev); 2108 struct Scsi_Host *host = stor_device->host; 2109 struct hv_host_device *host_dev = shost_priv(host); 2110 2111 storvsc_wait_to_drain(stor_device); 2112 2113 drain_workqueue(host_dev->handle_error_wq); 2114 2115 vmbus_close(hv_dev->channel); 2116 2117 kfree(stor_device->stor_chns); 2118 stor_device->stor_chns = NULL; 2119 2120 cpumask_clear(&stor_device->alloced_cpus); 2121 2122 return 0; 2123} 2124 2125static int storvsc_resume(struct hv_device *hv_dev) 2126{ 2127 int ret; 2128 2129 ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, 2130 hv_dev_is_fc(hv_dev)); 2131 return ret; 2132} 2133 2134static struct hv_driver storvsc_drv = { 2135 .name = KBUILD_MODNAME, 2136 .id_table = id_table, 2137 .probe = storvsc_probe, 2138 .remove = storvsc_remove, 2139 .suspend = storvsc_suspend, 2140 .resume = storvsc_resume, 2141 .driver = { 2142 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 2143 }, 2144}; 2145 2146#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2147static struct fc_function_template fc_transport_functions = { 2148 .show_host_node_name = 1, 2149 .show_host_port_name = 1, 2150}; 2151#endif 2152 2153static int __init storvsc_drv_init(void) 2154{ 2155 int ret; 2156 2157 /* 2158 * Divide the ring buffer data size (which is 1 page less 2159 * than the ring buffer size since that page is reserved for 2160 * the ring buffer indices) by the max request size (which is 2161 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 2162 */ 2163 max_outstanding_req_per_channel = 2164 ((storvsc_ringbuffer_size - PAGE_SIZE) / 2165 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 2166 sizeof(struct vstor_packet) + sizeof(u64) - 2167 vmscsi_size_delta, 2168 sizeof(u64))); 2169 2170#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2171 fc_transport_template = fc_attach_transport(&fc_transport_functions); 2172 if (!fc_transport_template) 2173 return -ENODEV; 2174#endif 2175 2176 ret = vmbus_driver_register(&storvsc_drv); 2177 2178#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2179 if (ret) 2180 fc_release_transport(fc_transport_template); 2181#endif 2182 2183 return ret; 2184} 2185 2186static void __exit storvsc_drv_exit(void) 2187{ 2188 vmbus_driver_unregister(&storvsc_drv); 2189#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2190 fc_release_transport(fc_transport_template); 2191#endif 2192} 2193 2194MODULE_LICENSE("GPL"); 2195MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 2196module_init(storvsc_drv_init); 2197module_exit(storvsc_drv_exit); 2198