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 * The list of storage protocols in order of preference. 221 */ 222 struct vmstor_protocol { 223 int protocol_version; 224 int sense_buffer_size; 225 int vmscsi_size_delta; 226 }; 227 228 229 static const struct vmstor_protocol vmstor_protocols[] = { 230 { 231 VMSTOR_PROTO_VERSION_WIN10, 232 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 233 0 234 }, 235 { 236 VMSTOR_PROTO_VERSION_WIN8_1, 237 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 238 0 239 }, 240 { 241 VMSTOR_PROTO_VERSION_WIN8, 242 POST_WIN7_STORVSC_SENSE_BUFFER_SIZE, 243 0 244 }, 245 { 246 VMSTOR_PROTO_VERSION_WIN7, 247 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 248 sizeof(struct vmscsi_win8_extension), 249 }, 250 { 251 VMSTOR_PROTO_VERSION_WIN6, 252 PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE, 253 sizeof(struct vmscsi_win8_extension), 254 } 255 }; 256 257 258 /* 259 * This structure is sent during the initialization phase to get the different 260 * properties of the channel. 261 */ 262 263 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 264 265 struct vmstorage_channel_properties { 266 u32 reserved; 267 u16 max_channel_cnt; 268 u16 reserved1; 269 270 u32 flags; 271 u32 max_transfer_bytes; 272 273 u64 reserved2; 274 } __packed; 275 276 /* This structure is sent during the storage protocol negotiations. */ 277 struct vmstorage_protocol_version { 278 /* Major (MSW) and minor (LSW) version numbers. */ 279 u16 major_minor; 280 281 /* 282 * Revision number is auto-incremented whenever this file is changed 283 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 284 * definitely indicate incompatibility--but it does indicate mismatched 285 * builds. 286 * This is only used on the windows side. Just set it to 0. 287 */ 288 u16 revision; 289 } __packed; 290 291 /* Channel Property Flags */ 292 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 293 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 294 295 struct vstor_packet { 296 /* Requested operation type */ 297 enum vstor_packet_operation operation; 298 299 /* Flags - see below for values */ 300 u32 flags; 301 302 /* Status of the request returned from the server side. */ 303 u32 status; 304 305 /* Data payload area */ 306 union { 307 /* 308 * Structure used to forward SCSI commands from the 309 * client to the server. 310 */ 311 struct vmscsi_request vm_srb; 312 313 /* Structure used to query channel properties. */ 314 struct vmstorage_channel_properties storage_channel_properties; 315 316 /* Used during version negotiations. */ 317 struct vmstorage_protocol_version version; 318 319 /* Fibre channel address packet */ 320 struct hv_fc_wwn_packet wwn_packet; 321 322 /* Number of sub-channels to create */ 323 u16 sub_channel_count; 324 325 /* This will be the maximum of the union members */ 326 u8 buffer[0x34]; 327 }; 328 } __packed; 329 330 /* 331 * Packet Flags: 332 * 333 * This flag indicates that the server should send back a completion for this 334 * packet. 335 */ 336 337 #define REQUEST_COMPLETION_FLAG 0x1 338 339 /* Matches Windows-end */ 340 enum storvsc_request_type { 341 WRITE_TYPE = 0, 342 READ_TYPE, 343 UNKNOWN_TYPE, 344 }; 345 346 /* 347 * SRB status codes and masks; a subset of the codes used here. 348 */ 349 350 #define SRB_STATUS_AUTOSENSE_VALID 0x80 351 #define SRB_STATUS_QUEUE_FROZEN 0x40 352 #define SRB_STATUS_INVALID_LUN 0x20 353 #define SRB_STATUS_SUCCESS 0x01 354 #define SRB_STATUS_ABORTED 0x02 355 #define SRB_STATUS_ERROR 0x04 356 #define SRB_STATUS_DATA_OVERRUN 0x12 357 358 #define SRB_STATUS(status) \ 359 (status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN)) 360 /* 361 * This is the end of Protocol specific defines. 362 */ 363 364 static int storvsc_ringbuffer_size = (128 * 1024); 365 static u32 max_outstanding_req_per_channel; 366 static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth); 367 368 static int storvsc_vcpus_per_sub_channel = 4; 369 370 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 371 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 372 373 module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO); 374 MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels"); 375 376 static int ring_avail_percent_lowater = 10; 377 module_param(ring_avail_percent_lowater, int, S_IRUGO); 378 MODULE_PARM_DESC(ring_avail_percent_lowater, 379 "Select a channel if available ring size > this in percent"); 380 381 /* 382 * Timeout in seconds for all devices managed by this driver. 383 */ 384 static int storvsc_timeout = 180; 385 386 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 387 static struct scsi_transport_template *fc_transport_template; 388 #endif 389 390 static struct scsi_host_template scsi_driver; 391 static void storvsc_on_channel_callback(void *context); 392 393 #define STORVSC_MAX_LUNS_PER_TARGET 255 394 #define STORVSC_MAX_TARGETS 2 395 #define STORVSC_MAX_CHANNELS 8 396 397 #define STORVSC_FC_MAX_LUNS_PER_TARGET 255 398 #define STORVSC_FC_MAX_TARGETS 128 399 #define STORVSC_FC_MAX_CHANNELS 8 400 401 #define STORVSC_IDE_MAX_LUNS_PER_TARGET 64 402 #define STORVSC_IDE_MAX_TARGETS 1 403 #define STORVSC_IDE_MAX_CHANNELS 1 404 405 struct storvsc_cmd_request { 406 struct scsi_cmnd *cmd; 407 408 struct hv_device *device; 409 410 /* Synchronize the request/response if needed */ 411 struct completion wait_event; 412 413 struct vmbus_channel_packet_multipage_buffer mpb; 414 struct vmbus_packet_mpb_array *payload; 415 u32 payload_sz; 416 417 struct vstor_packet vstor_packet; 418 }; 419 420 421 /* A storvsc device is a device object that contains a vmbus channel */ 422 struct storvsc_device { 423 struct hv_device *device; 424 425 bool destroy; 426 bool drain_notify; 427 atomic_t num_outstanding_req; 428 struct Scsi_Host *host; 429 430 wait_queue_head_t waiting_to_drain; 431 432 /* 433 * Each unique Port/Path/Target represents 1 channel ie scsi 434 * controller. In reality, the pathid, targetid is always 0 435 * and the port is set by us 436 */ 437 unsigned int port_number; 438 unsigned char path_id; 439 unsigned char target_id; 440 441 /* 442 * The size of the vmscsi_request has changed in win8. The 443 * additional size is because of new elements added to the 444 * structure. These elements are valid only when we are talking 445 * to a win8 host. 446 * Track the correction to size we need to apply. This value 447 * will likely change during protocol negotiation but it is 448 * valid to start by assuming pre-Win8. 449 */ 450 int vmscsi_size_delta; 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 /* 702 * The size of vmbus_requestor is an upper bound on the number of requests 703 * that can be in-progress at any one time across all channels. 704 */ 705 new_sc->rqstor_size = scsi_driver.can_queue; 706 707 ret = vmbus_open(new_sc, 708 storvsc_ringbuffer_size, 709 storvsc_ringbuffer_size, 710 (void *)&props, 711 sizeof(struct vmstorage_channel_properties), 712 storvsc_on_channel_callback, new_sc); 713 714 /* In case vmbus_open() fails, we don't use the sub-channel. */ 715 if (ret != 0) { 716 dev_err(dev, "Failed to open sub-channel: err=%d\n", ret); 717 return; 718 } 719 720 new_sc->change_target_cpu_callback = storvsc_change_target_cpu; 721 722 /* Add the sub-channel to the array of available channels. */ 723 stor_device->stor_chns[new_sc->target_cpu] = new_sc; 724 cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus); 725 } 726 727 static void handle_multichannel_storage(struct hv_device *device, int max_chns) 728 { 729 struct device *dev = &device->device; 730 struct storvsc_device *stor_device; 731 int num_sc; 732 struct storvsc_cmd_request *request; 733 struct vstor_packet *vstor_packet; 734 int ret, t; 735 736 /* 737 * If the number of CPUs is artificially restricted, such as 738 * with maxcpus=1 on the kernel boot line, Hyper-V could offer 739 * sub-channels >= the number of CPUs. These sub-channels 740 * should not be created. The primary channel is already created 741 * and assigned to one CPU, so check against # CPUs - 1. 742 */ 743 num_sc = min((int)(num_online_cpus() - 1), max_chns); 744 if (!num_sc) 745 return; 746 747 stor_device = get_out_stor_device(device); 748 if (!stor_device) 749 return; 750 751 stor_device->num_sc = num_sc; 752 request = &stor_device->init_request; 753 vstor_packet = &request->vstor_packet; 754 755 /* 756 * Establish a handler for dealing with subchannels. 757 */ 758 vmbus_set_sc_create_callback(device->channel, handle_sc_creation); 759 760 /* 761 * Request the host to create sub-channels. 762 */ 763 memset(request, 0, sizeof(struct storvsc_cmd_request)); 764 init_completion(&request->wait_event); 765 vstor_packet->operation = VSTOR_OPERATION_CREATE_SUB_CHANNELS; 766 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 767 vstor_packet->sub_channel_count = num_sc; 768 769 ret = vmbus_sendpacket(device->channel, vstor_packet, 770 (sizeof(struct vstor_packet) - 771 stor_device->vmscsi_size_delta), 772 (unsigned long)request, 773 VM_PKT_DATA_INBAND, 774 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 775 776 if (ret != 0) { 777 dev_err(dev, "Failed to create sub-channel: err=%d\n", ret); 778 return; 779 } 780 781 t = wait_for_completion_timeout(&request->wait_event, 10*HZ); 782 if (t == 0) { 783 dev_err(dev, "Failed to create sub-channel: timed out\n"); 784 return; 785 } 786 787 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 788 vstor_packet->status != 0) { 789 dev_err(dev, "Failed to create sub-channel: op=%d, sts=%d\n", 790 vstor_packet->operation, vstor_packet->status); 791 return; 792 } 793 794 /* 795 * We need to do nothing here, because vmbus_process_offer() 796 * invokes channel->sc_creation_callback, which will open and use 797 * the sub-channel(s). 798 */ 799 } 800 801 static void cache_wwn(struct storvsc_device *stor_device, 802 struct vstor_packet *vstor_packet) 803 { 804 /* 805 * Cache the currently active port and node ww names. 806 */ 807 if (vstor_packet->wwn_packet.primary_active) { 808 stor_device->node_name = 809 wwn_to_u64(vstor_packet->wwn_packet.primary_node_wwn); 810 stor_device->port_name = 811 wwn_to_u64(vstor_packet->wwn_packet.primary_port_wwn); 812 } else { 813 stor_device->node_name = 814 wwn_to_u64(vstor_packet->wwn_packet.secondary_node_wwn); 815 stor_device->port_name = 816 wwn_to_u64(vstor_packet->wwn_packet.secondary_port_wwn); 817 } 818 } 819 820 821 static int storvsc_execute_vstor_op(struct hv_device *device, 822 struct storvsc_cmd_request *request, 823 bool status_check) 824 { 825 struct storvsc_device *stor_device; 826 struct vstor_packet *vstor_packet; 827 int ret, t; 828 829 stor_device = get_out_stor_device(device); 830 if (!stor_device) 831 return -ENODEV; 832 833 vstor_packet = &request->vstor_packet; 834 835 init_completion(&request->wait_event); 836 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 837 838 ret = vmbus_sendpacket(device->channel, vstor_packet, 839 (sizeof(struct vstor_packet) - 840 stor_device->vmscsi_size_delta), 841 (unsigned long)request, 842 VM_PKT_DATA_INBAND, 843 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 844 if (ret != 0) 845 return ret; 846 847 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 848 if (t == 0) 849 return -ETIMEDOUT; 850 851 if (!status_check) 852 return ret; 853 854 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 855 vstor_packet->status != 0) 856 return -EINVAL; 857 858 return ret; 859 } 860 861 static int storvsc_channel_init(struct hv_device *device, bool is_fc) 862 { 863 struct storvsc_device *stor_device; 864 struct storvsc_cmd_request *request; 865 struct vstor_packet *vstor_packet; 866 int ret, i; 867 int max_chns; 868 bool process_sub_channels = false; 869 870 stor_device = get_out_stor_device(device); 871 if (!stor_device) 872 return -ENODEV; 873 874 request = &stor_device->init_request; 875 vstor_packet = &request->vstor_packet; 876 877 /* 878 * Now, initiate the vsc/vsp initialization protocol on the open 879 * channel 880 */ 881 memset(request, 0, sizeof(struct storvsc_cmd_request)); 882 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 883 ret = storvsc_execute_vstor_op(device, request, true); 884 if (ret) 885 return ret; 886 /* 887 * Query host supported protocol version. 888 */ 889 890 for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) { 891 /* reuse the packet for version range supported */ 892 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 893 vstor_packet->operation = 894 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 895 896 vstor_packet->version.major_minor = 897 vmstor_protocols[i].protocol_version; 898 899 /* 900 * The revision number is only used in Windows; set it to 0. 901 */ 902 vstor_packet->version.revision = 0; 903 ret = storvsc_execute_vstor_op(device, request, false); 904 if (ret != 0) 905 return ret; 906 907 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) 908 return -EINVAL; 909 910 if (vstor_packet->status == 0) { 911 vmstor_proto_version = 912 vmstor_protocols[i].protocol_version; 913 914 sense_buffer_size = 915 vmstor_protocols[i].sense_buffer_size; 916 917 stor_device->vmscsi_size_delta = 918 vmstor_protocols[i].vmscsi_size_delta; 919 920 break; 921 } 922 } 923 924 if (vstor_packet->status != 0) 925 return -EINVAL; 926 927 928 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 929 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 930 ret = storvsc_execute_vstor_op(device, request, true); 931 if (ret != 0) 932 return ret; 933 934 /* 935 * Check to see if multi-channel support is there. 936 * Hosts that implement protocol version of 5.1 and above 937 * support multi-channel. 938 */ 939 max_chns = vstor_packet->storage_channel_properties.max_channel_cnt; 940 941 /* 942 * Allocate state to manage the sub-channels. 943 * We allocate an array based on the numbers of possible CPUs 944 * (Hyper-V does not support cpu online/offline). 945 * This Array will be sparseley populated with unique 946 * channels - primary + sub-channels. 947 * We will however populate all the slots to evenly distribute 948 * the load. 949 */ 950 stor_device->stor_chns = kcalloc(num_possible_cpus(), sizeof(void *), 951 GFP_KERNEL); 952 if (stor_device->stor_chns == NULL) 953 return -ENOMEM; 954 955 device->channel->change_target_cpu_callback = storvsc_change_target_cpu; 956 957 stor_device->stor_chns[device->channel->target_cpu] = device->channel; 958 cpumask_set_cpu(device->channel->target_cpu, 959 &stor_device->alloced_cpus); 960 961 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) { 962 if (vstor_packet->storage_channel_properties.flags & 963 STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL) 964 process_sub_channels = true; 965 } 966 stor_device->max_transfer_bytes = 967 vstor_packet->storage_channel_properties.max_transfer_bytes; 968 969 if (!is_fc) 970 goto done; 971 972 /* 973 * For FC devices retrieve FC HBA data. 974 */ 975 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 976 vstor_packet->operation = VSTOR_OPERATION_FCHBA_DATA; 977 ret = storvsc_execute_vstor_op(device, request, true); 978 if (ret != 0) 979 return ret; 980 981 /* 982 * Cache the currently active port and node ww names. 983 */ 984 cache_wwn(stor_device, vstor_packet); 985 986 done: 987 988 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 989 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 990 ret = storvsc_execute_vstor_op(device, request, true); 991 if (ret != 0) 992 return ret; 993 994 if (process_sub_channels) 995 handle_multichannel_storage(device, max_chns); 996 997 return ret; 998 } 999 1000 static void storvsc_handle_error(struct vmscsi_request *vm_srb, 1001 struct scsi_cmnd *scmnd, 1002 struct Scsi_Host *host, 1003 u8 asc, u8 ascq) 1004 { 1005 struct storvsc_scan_work *wrk; 1006 void (*process_err_fn)(struct work_struct *work); 1007 struct hv_host_device *host_dev = shost_priv(host); 1008 bool do_work = false; 1009 1010 switch (SRB_STATUS(vm_srb->srb_status)) { 1011 case SRB_STATUS_ERROR: 1012 /* 1013 * Let upper layer deal with error when 1014 * sense message is present. 1015 */ 1016 1017 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) 1018 break; 1019 /* 1020 * If there is an error; offline the device since all 1021 * error recovery strategies would have already been 1022 * deployed on the host side. However, if the command 1023 * were a pass-through command deal with it appropriately. 1024 */ 1025 switch (scmnd->cmnd[0]) { 1026 case ATA_16: 1027 case ATA_12: 1028 set_host_byte(scmnd, DID_PASSTHROUGH); 1029 break; 1030 /* 1031 * On Some Windows hosts TEST_UNIT_READY command can return 1032 * SRB_STATUS_ERROR, let the upper level code deal with it 1033 * based on the sense information. 1034 */ 1035 case TEST_UNIT_READY: 1036 break; 1037 default: 1038 set_host_byte(scmnd, DID_ERROR); 1039 } 1040 break; 1041 case SRB_STATUS_INVALID_LUN: 1042 set_host_byte(scmnd, DID_NO_CONNECT); 1043 do_work = true; 1044 process_err_fn = storvsc_remove_lun; 1045 break; 1046 case SRB_STATUS_ABORTED: 1047 if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID && 1048 (asc == 0x2a) && (ascq == 0x9)) { 1049 do_work = true; 1050 process_err_fn = storvsc_device_scan; 1051 /* 1052 * Retry the I/O that triggered this. 1053 */ 1054 set_host_byte(scmnd, DID_REQUEUE); 1055 } 1056 break; 1057 } 1058 1059 if (!do_work) 1060 return; 1061 1062 /* 1063 * We need to schedule work to process this error; schedule it. 1064 */ 1065 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1066 if (!wrk) { 1067 set_host_byte(scmnd, DID_TARGET_FAILURE); 1068 return; 1069 } 1070 1071 wrk->host = host; 1072 wrk->lun = vm_srb->lun; 1073 wrk->tgt_id = vm_srb->target_id; 1074 INIT_WORK(&wrk->work, process_err_fn); 1075 queue_work(host_dev->handle_error_wq, &wrk->work); 1076 } 1077 1078 1079 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, 1080 struct storvsc_device *stor_dev) 1081 { 1082 struct scsi_cmnd *scmnd = cmd_request->cmd; 1083 struct scsi_sense_hdr sense_hdr; 1084 struct vmscsi_request *vm_srb; 1085 u32 data_transfer_length; 1086 struct Scsi_Host *host; 1087 u32 payload_sz = cmd_request->payload_sz; 1088 void *payload = cmd_request->payload; 1089 1090 host = stor_dev->host; 1091 1092 vm_srb = &cmd_request->vstor_packet.vm_srb; 1093 data_transfer_length = vm_srb->data_transfer_length; 1094 1095 scmnd->result = vm_srb->scsi_status; 1096 1097 if (scmnd->result) { 1098 if (scsi_normalize_sense(scmnd->sense_buffer, 1099 SCSI_SENSE_BUFFERSIZE, &sense_hdr) && 1100 !(sense_hdr.sense_key == NOT_READY && 1101 sense_hdr.asc == 0x03A) && 1102 do_logging(STORVSC_LOGGING_ERROR)) 1103 scsi_print_sense_hdr(scmnd->device, "storvsc", 1104 &sense_hdr); 1105 } 1106 1107 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) { 1108 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 1109 sense_hdr.ascq); 1110 /* 1111 * The Windows driver set data_transfer_length on 1112 * SRB_STATUS_DATA_OVERRUN. On other errors, this value 1113 * is untouched. In these cases we set it to 0. 1114 */ 1115 if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN) 1116 data_transfer_length = 0; 1117 } 1118 1119 /* Validate data_transfer_length (from Hyper-V) */ 1120 if (data_transfer_length > cmd_request->payload->range.len) 1121 data_transfer_length = cmd_request->payload->range.len; 1122 1123 scsi_set_resid(scmnd, 1124 cmd_request->payload->range.len - data_transfer_length); 1125 1126 scmnd->scsi_done(scmnd); 1127 1128 if (payload_sz > 1129 sizeof(struct vmbus_channel_packet_multipage_buffer)) 1130 kfree(payload); 1131 } 1132 1133 static void storvsc_on_io_completion(struct storvsc_device *stor_device, 1134 struct vstor_packet *vstor_packet, 1135 struct storvsc_cmd_request *request) 1136 { 1137 struct vstor_packet *stor_pkt; 1138 struct hv_device *device = stor_device->device; 1139 1140 stor_pkt = &request->vstor_packet; 1141 1142 /* 1143 * The current SCSI handling on the host side does 1144 * not correctly handle: 1145 * INQUIRY command with page code parameter set to 0x80 1146 * MODE_SENSE command with cmd[2] == 0x1c 1147 * 1148 * Setup srb and scsi status so this won't be fatal. 1149 * We do this so we can distinguish truly fatal failues 1150 * (srb status == 0x4) and off-line the device in that case. 1151 */ 1152 1153 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 1154 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 1155 vstor_packet->vm_srb.scsi_status = 0; 1156 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 1157 } 1158 1159 1160 /* Copy over the status...etc */ 1161 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 1162 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 1163 1164 /* Validate sense_info_length (from Hyper-V) */ 1165 if (vstor_packet->vm_srb.sense_info_length > sense_buffer_size) 1166 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1167 1168 stor_pkt->vm_srb.sense_info_length = 1169 vstor_packet->vm_srb.sense_info_length; 1170 1171 if (vstor_packet->vm_srb.scsi_status != 0 || 1172 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) 1173 storvsc_log(device, STORVSC_LOGGING_WARN, 1174 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 1175 stor_pkt->vm_srb.cdb[0], 1176 vstor_packet->vm_srb.scsi_status, 1177 vstor_packet->vm_srb.srb_status); 1178 1179 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1180 /* CHECK_CONDITION */ 1181 if (vstor_packet->vm_srb.srb_status & 1182 SRB_STATUS_AUTOSENSE_VALID) { 1183 /* autosense data available */ 1184 1185 storvsc_log(device, STORVSC_LOGGING_WARN, 1186 "stor pkt %p autosense data valid - len %d\n", 1187 request, vstor_packet->vm_srb.sense_info_length); 1188 1189 memcpy(request->cmd->sense_buffer, 1190 vstor_packet->vm_srb.sense_data, 1191 vstor_packet->vm_srb.sense_info_length); 1192 1193 } 1194 } 1195 1196 stor_pkt->vm_srb.data_transfer_length = 1197 vstor_packet->vm_srb.data_transfer_length; 1198 1199 storvsc_command_completion(request, stor_device); 1200 1201 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1202 stor_device->drain_notify) 1203 wake_up(&stor_device->waiting_to_drain); 1204 1205 1206 } 1207 1208 static void storvsc_on_receive(struct storvsc_device *stor_device, 1209 struct vstor_packet *vstor_packet, 1210 struct storvsc_cmd_request *request) 1211 { 1212 struct hv_host_device *host_dev; 1213 switch (vstor_packet->operation) { 1214 case VSTOR_OPERATION_COMPLETE_IO: 1215 storvsc_on_io_completion(stor_device, vstor_packet, request); 1216 break; 1217 1218 case VSTOR_OPERATION_REMOVE_DEVICE: 1219 case VSTOR_OPERATION_ENUMERATE_BUS: 1220 host_dev = shost_priv(stor_device->host); 1221 queue_work( 1222 host_dev->handle_error_wq, &host_dev->host_scan_work); 1223 break; 1224 1225 case VSTOR_OPERATION_FCHBA_DATA: 1226 cache_wwn(stor_device, vstor_packet); 1227 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1228 fc_host_node_name(stor_device->host) = stor_device->node_name; 1229 fc_host_port_name(stor_device->host) = stor_device->port_name; 1230 #endif 1231 break; 1232 default: 1233 break; 1234 } 1235 } 1236 1237 static void storvsc_on_channel_callback(void *context) 1238 { 1239 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1240 const struct vmpacket_descriptor *desc; 1241 struct hv_device *device; 1242 struct storvsc_device *stor_device; 1243 1244 if (channel->primary_channel != NULL) 1245 device = channel->primary_channel->device_obj; 1246 else 1247 device = channel->device_obj; 1248 1249 stor_device = get_in_stor_device(device); 1250 if (!stor_device) 1251 return; 1252 1253 foreach_vmbus_pkt(desc, channel) { 1254 void *packet = hv_pkt_data(desc); 1255 struct storvsc_cmd_request *request; 1256 u64 cmd_rqst; 1257 1258 cmd_rqst = vmbus_request_addr(&channel->requestor, 1259 desc->trans_id); 1260 if (cmd_rqst == VMBUS_RQST_ERROR) { 1261 dev_err(&device->device, 1262 "Incorrect transaction id\n"); 1263 continue; 1264 } 1265 1266 request = (struct storvsc_cmd_request *)(unsigned long)cmd_rqst; 1267 1268 if (hv_pkt_datalen(desc) < sizeof(struct vstor_packet) - 1269 stor_device->vmscsi_size_delta) { 1270 dev_err(&device->device, "Invalid packet len\n"); 1271 continue; 1272 } 1273 1274 if (request == &stor_device->init_request || 1275 request == &stor_device->reset_request) { 1276 memcpy(&request->vstor_packet, packet, 1277 (sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta)); 1278 complete(&request->wait_event); 1279 } else { 1280 storvsc_on_receive(stor_device, packet, request); 1281 } 1282 } 1283 } 1284 1285 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, 1286 bool is_fc) 1287 { 1288 struct vmstorage_channel_properties props; 1289 int ret; 1290 1291 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1292 1293 /* 1294 * The size of vmbus_requestor is an upper bound on the number of requests 1295 * that can be in-progress at any one time across all channels. 1296 */ 1297 device->channel->rqstor_size = scsi_driver.can_queue; 1298 1299 ret = vmbus_open(device->channel, 1300 ring_size, 1301 ring_size, 1302 (void *)&props, 1303 sizeof(struct vmstorage_channel_properties), 1304 storvsc_on_channel_callback, device->channel); 1305 1306 if (ret != 0) 1307 return ret; 1308 1309 ret = storvsc_channel_init(device, is_fc); 1310 1311 return ret; 1312 } 1313 1314 static int storvsc_dev_remove(struct hv_device *device) 1315 { 1316 struct storvsc_device *stor_device; 1317 1318 stor_device = hv_get_drvdata(device); 1319 1320 stor_device->destroy = true; 1321 1322 /* Make sure flag is set before waiting */ 1323 wmb(); 1324 1325 /* 1326 * At this point, all outbound traffic should be disable. We 1327 * only allow inbound traffic (responses) to proceed so that 1328 * outstanding requests can be completed. 1329 */ 1330 1331 storvsc_wait_to_drain(stor_device); 1332 1333 /* 1334 * Since we have already drained, we don't need to busy wait 1335 * as was done in final_release_stor_device() 1336 * Note that we cannot set the ext pointer to NULL until 1337 * we have drained - to drain the outgoing packets, we need to 1338 * allow incoming packets. 1339 */ 1340 hv_set_drvdata(device, NULL); 1341 1342 /* Close the channel */ 1343 vmbus_close(device->channel); 1344 1345 kfree(stor_device->stor_chns); 1346 kfree(stor_device); 1347 return 0; 1348 } 1349 1350 static struct vmbus_channel *get_og_chn(struct storvsc_device *stor_device, 1351 u16 q_num) 1352 { 1353 u16 slot = 0; 1354 u16 hash_qnum; 1355 const struct cpumask *node_mask; 1356 int num_channels, tgt_cpu; 1357 1358 if (stor_device->num_sc == 0) { 1359 stor_device->stor_chns[q_num] = stor_device->device->channel; 1360 return stor_device->device->channel; 1361 } 1362 1363 /* 1364 * Our channel array is sparsley populated and we 1365 * initiated I/O on a processor/hw-q that does not 1366 * currently have a designated channel. Fix this. 1367 * The strategy is simple: 1368 * I. Ensure NUMA locality 1369 * II. Distribute evenly (best effort) 1370 */ 1371 1372 node_mask = cpumask_of_node(cpu_to_node(q_num)); 1373 1374 num_channels = 0; 1375 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1376 if (cpumask_test_cpu(tgt_cpu, node_mask)) 1377 num_channels++; 1378 } 1379 if (num_channels == 0) { 1380 stor_device->stor_chns[q_num] = stor_device->device->channel; 1381 return stor_device->device->channel; 1382 } 1383 1384 hash_qnum = q_num; 1385 while (hash_qnum >= num_channels) 1386 hash_qnum -= num_channels; 1387 1388 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1389 if (!cpumask_test_cpu(tgt_cpu, node_mask)) 1390 continue; 1391 if (slot == hash_qnum) 1392 break; 1393 slot++; 1394 } 1395 1396 stor_device->stor_chns[q_num] = stor_device->stor_chns[tgt_cpu]; 1397 1398 return stor_device->stor_chns[q_num]; 1399 } 1400 1401 1402 static int storvsc_do_io(struct hv_device *device, 1403 struct storvsc_cmd_request *request, u16 q_num) 1404 { 1405 struct storvsc_device *stor_device; 1406 struct vstor_packet *vstor_packet; 1407 struct vmbus_channel *outgoing_channel, *channel; 1408 unsigned long flags; 1409 int ret = 0; 1410 const struct cpumask *node_mask; 1411 int tgt_cpu; 1412 1413 vstor_packet = &request->vstor_packet; 1414 stor_device = get_out_stor_device(device); 1415 1416 if (!stor_device) 1417 return -ENODEV; 1418 1419 1420 request->device = device; 1421 /* 1422 * Select an appropriate channel to send the request out. 1423 */ 1424 /* See storvsc_change_target_cpu(). */ 1425 outgoing_channel = READ_ONCE(stor_device->stor_chns[q_num]); 1426 if (outgoing_channel != NULL) { 1427 if (outgoing_channel->target_cpu == q_num) { 1428 /* 1429 * Ideally, we want to pick a different channel if 1430 * available on the same NUMA node. 1431 */ 1432 node_mask = cpumask_of_node(cpu_to_node(q_num)); 1433 for_each_cpu_wrap(tgt_cpu, 1434 &stor_device->alloced_cpus, q_num + 1) { 1435 if (!cpumask_test_cpu(tgt_cpu, node_mask)) 1436 continue; 1437 if (tgt_cpu == q_num) 1438 continue; 1439 channel = READ_ONCE( 1440 stor_device->stor_chns[tgt_cpu]); 1441 if (channel == NULL) 1442 continue; 1443 if (hv_get_avail_to_write_percent( 1444 &channel->outbound) 1445 > ring_avail_percent_lowater) { 1446 outgoing_channel = channel; 1447 goto found_channel; 1448 } 1449 } 1450 1451 /* 1452 * All the other channels on the same NUMA node are 1453 * busy. Try to use the channel on the current CPU 1454 */ 1455 if (hv_get_avail_to_write_percent( 1456 &outgoing_channel->outbound) 1457 > ring_avail_percent_lowater) 1458 goto found_channel; 1459 1460 /* 1461 * If we reach here, all the channels on the current 1462 * NUMA node are busy. Try to find a channel in 1463 * other NUMA nodes 1464 */ 1465 for_each_cpu(tgt_cpu, &stor_device->alloced_cpus) { 1466 if (cpumask_test_cpu(tgt_cpu, node_mask)) 1467 continue; 1468 channel = READ_ONCE( 1469 stor_device->stor_chns[tgt_cpu]); 1470 if (channel == NULL) 1471 continue; 1472 if (hv_get_avail_to_write_percent( 1473 &channel->outbound) 1474 > ring_avail_percent_lowater) { 1475 outgoing_channel = channel; 1476 goto found_channel; 1477 } 1478 } 1479 } 1480 } else { 1481 spin_lock_irqsave(&stor_device->lock, flags); 1482 outgoing_channel = stor_device->stor_chns[q_num]; 1483 if (outgoing_channel != NULL) { 1484 spin_unlock_irqrestore(&stor_device->lock, flags); 1485 goto found_channel; 1486 } 1487 outgoing_channel = get_og_chn(stor_device, q_num); 1488 spin_unlock_irqrestore(&stor_device->lock, flags); 1489 } 1490 1491 found_channel: 1492 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1493 1494 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1495 stor_device->vmscsi_size_delta); 1496 1497 1498 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1499 1500 1501 vstor_packet->vm_srb.data_transfer_length = 1502 request->payload->range.len; 1503 1504 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1505 1506 if (request->payload->range.len) { 1507 1508 ret = vmbus_sendpacket_mpb_desc(outgoing_channel, 1509 request->payload, request->payload_sz, 1510 vstor_packet, 1511 (sizeof(struct vstor_packet) - 1512 stor_device->vmscsi_size_delta), 1513 (unsigned long)request); 1514 } else { 1515 ret = vmbus_sendpacket(outgoing_channel, vstor_packet, 1516 (sizeof(struct vstor_packet) - 1517 stor_device->vmscsi_size_delta), 1518 (unsigned long)request, 1519 VM_PKT_DATA_INBAND, 1520 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1521 } 1522 1523 if (ret != 0) 1524 return ret; 1525 1526 atomic_inc(&stor_device->num_outstanding_req); 1527 1528 return ret; 1529 } 1530 1531 static int storvsc_device_alloc(struct scsi_device *sdevice) 1532 { 1533 /* 1534 * Set blist flag to permit the reading of the VPD pages even when 1535 * the target may claim SPC-2 compliance. MSFT targets currently 1536 * claim SPC-2 compliance while they implement post SPC-2 features. 1537 * With this flag we can correctly handle WRITE_SAME_16 issues. 1538 * 1539 * Hypervisor reports SCSI_UNKNOWN type for DVD ROM device but 1540 * still supports REPORT LUN. 1541 */ 1542 sdevice->sdev_bflags = BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES; 1543 1544 return 0; 1545 } 1546 1547 static int storvsc_device_configure(struct scsi_device *sdevice) 1548 { 1549 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1550 1551 sdevice->no_write_same = 1; 1552 1553 /* 1554 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3 1555 * if the device is a MSFT virtual device. If the host is 1556 * WIN10 or newer, allow write_same. 1557 */ 1558 if (!strncmp(sdevice->vendor, "Msft", 4)) { 1559 switch (vmstor_proto_version) { 1560 case VMSTOR_PROTO_VERSION_WIN8: 1561 case VMSTOR_PROTO_VERSION_WIN8_1: 1562 sdevice->scsi_level = SCSI_SPC_3; 1563 break; 1564 } 1565 1566 if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10) 1567 sdevice->no_write_same = 0; 1568 } 1569 1570 return 0; 1571 } 1572 1573 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1574 sector_t capacity, int *info) 1575 { 1576 sector_t nsect = capacity; 1577 sector_t cylinders = nsect; 1578 int heads, sectors_pt; 1579 1580 /* 1581 * We are making up these values; let us keep it simple. 1582 */ 1583 heads = 0xff; 1584 sectors_pt = 0x3f; /* Sectors per track */ 1585 sector_div(cylinders, heads * sectors_pt); 1586 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1587 cylinders = 0xffff; 1588 1589 info[0] = heads; 1590 info[1] = sectors_pt; 1591 info[2] = (int)cylinders; 1592 1593 return 0; 1594 } 1595 1596 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1597 { 1598 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1599 struct hv_device *device = host_dev->dev; 1600 1601 struct storvsc_device *stor_device; 1602 struct storvsc_cmd_request *request; 1603 struct vstor_packet *vstor_packet; 1604 int ret, t; 1605 1606 stor_device = get_out_stor_device(device); 1607 if (!stor_device) 1608 return FAILED; 1609 1610 request = &stor_device->reset_request; 1611 vstor_packet = &request->vstor_packet; 1612 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 1613 1614 init_completion(&request->wait_event); 1615 1616 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1617 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1618 vstor_packet->vm_srb.path_id = stor_device->path_id; 1619 1620 ret = vmbus_sendpacket(device->channel, vstor_packet, 1621 (sizeof(struct vstor_packet) - 1622 stor_device->vmscsi_size_delta), 1623 (unsigned long)&stor_device->reset_request, 1624 VM_PKT_DATA_INBAND, 1625 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1626 if (ret != 0) 1627 return FAILED; 1628 1629 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1630 if (t == 0) 1631 return TIMEOUT_ERROR; 1632 1633 1634 /* 1635 * At this point, all outstanding requests in the adapter 1636 * should have been flushed out and return to us 1637 * There is a potential race here where the host may be in 1638 * the process of responding when we return from here. 1639 * Just wait for all in-transit packets to be accounted for 1640 * before we return from here. 1641 */ 1642 storvsc_wait_to_drain(stor_device); 1643 1644 return SUCCESS; 1645 } 1646 1647 /* 1648 * The host guarantees to respond to each command, although I/O latencies might 1649 * be unbounded on Azure. Reset the timer unconditionally to give the host a 1650 * chance to perform EH. 1651 */ 1652 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd) 1653 { 1654 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1655 if (scmnd->device->host->transportt == fc_transport_template) 1656 return fc_eh_timed_out(scmnd); 1657 #endif 1658 return BLK_EH_RESET_TIMER; 1659 } 1660 1661 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1662 { 1663 bool allowed = true; 1664 u8 scsi_op = scmnd->cmnd[0]; 1665 1666 switch (scsi_op) { 1667 /* the host does not handle WRITE_SAME, log accident usage */ 1668 case WRITE_SAME: 1669 /* 1670 * smartd sends this command and the host does not handle 1671 * this. So, don't send it. 1672 */ 1673 case SET_WINDOW: 1674 scmnd->result = DID_ERROR << 16; 1675 allowed = false; 1676 break; 1677 default: 1678 break; 1679 } 1680 return allowed; 1681 } 1682 1683 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1684 { 1685 int ret; 1686 struct hv_host_device *host_dev = shost_priv(host); 1687 struct hv_device *dev = host_dev->dev; 1688 struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd); 1689 int i; 1690 struct scatterlist *sgl; 1691 unsigned int sg_count = 0; 1692 struct vmscsi_request *vm_srb; 1693 struct scatterlist *cur_sgl; 1694 struct vmbus_packet_mpb_array *payload; 1695 u32 payload_sz; 1696 u32 length; 1697 1698 if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) { 1699 /* 1700 * On legacy hosts filter unimplemented commands. 1701 * Future hosts are expected to correctly handle 1702 * unsupported commands. Furthermore, it is 1703 * possible that some of the currently 1704 * unsupported commands maybe supported in 1705 * future versions of the host. 1706 */ 1707 if (!storvsc_scsi_cmd_ok(scmnd)) { 1708 scmnd->scsi_done(scmnd); 1709 return 0; 1710 } 1711 } 1712 1713 /* Setup the cmd request */ 1714 cmd_request->cmd = scmnd; 1715 1716 memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet)); 1717 vm_srb = &cmd_request->vstor_packet.vm_srb; 1718 vm_srb->win8_extension.time_out_value = 60; 1719 1720 vm_srb->win8_extension.srb_flags |= 1721 SRB_FLAGS_DISABLE_SYNCH_TRANSFER; 1722 1723 if (scmnd->device->tagged_supported) { 1724 vm_srb->win8_extension.srb_flags |= 1725 (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); 1726 vm_srb->win8_extension.queue_tag = SP_UNTAGGED; 1727 vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; 1728 } 1729 1730 /* Build the SRB */ 1731 switch (scmnd->sc_data_direction) { 1732 case DMA_TO_DEVICE: 1733 vm_srb->data_in = WRITE_TYPE; 1734 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1735 break; 1736 case DMA_FROM_DEVICE: 1737 vm_srb->data_in = READ_TYPE; 1738 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1739 break; 1740 case DMA_NONE: 1741 vm_srb->data_in = UNKNOWN_TYPE; 1742 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; 1743 break; 1744 default: 1745 /* 1746 * This is DMA_BIDIRECTIONAL or something else we are never 1747 * supposed to see here. 1748 */ 1749 WARN(1, "Unexpected data direction: %d\n", 1750 scmnd->sc_data_direction); 1751 return -EINVAL; 1752 } 1753 1754 1755 vm_srb->port_number = host_dev->port; 1756 vm_srb->path_id = scmnd->device->channel; 1757 vm_srb->target_id = scmnd->device->id; 1758 vm_srb->lun = scmnd->device->lun; 1759 1760 vm_srb->cdb_length = scmnd->cmd_len; 1761 1762 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1763 1764 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1765 sg_count = scsi_sg_count(scmnd); 1766 1767 length = scsi_bufflen(scmnd); 1768 payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb; 1769 payload_sz = sizeof(cmd_request->mpb); 1770 1771 if (sg_count) { 1772 unsigned int hvpgoff = 0; 1773 unsigned long offset_in_hvpg = sgl->offset & ~HV_HYP_PAGE_MASK; 1774 unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length); 1775 u64 hvpfn; 1776 1777 if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { 1778 1779 payload_sz = (hvpg_count * sizeof(u64) + 1780 sizeof(struct vmbus_packet_mpb_array)); 1781 payload = kzalloc(payload_sz, GFP_ATOMIC); 1782 if (!payload) 1783 return SCSI_MLQUEUE_DEVICE_BUSY; 1784 } 1785 1786 /* 1787 * sgl is a list of PAGEs, and payload->range.pfn_array 1788 * expects the page number in the unit of HV_HYP_PAGE_SIZE (the 1789 * page size that Hyper-V uses, so here we need to divide PAGEs 1790 * into HV_HYP_PAGE in case that PAGE_SIZE > HV_HYP_PAGE_SIZE. 1791 * Besides, payload->range.offset should be the offset in one 1792 * HV_HYP_PAGE. 1793 */ 1794 payload->range.len = length; 1795 payload->range.offset = offset_in_hvpg; 1796 hvpgoff = sgl->offset >> HV_HYP_PAGE_SHIFT; 1797 1798 cur_sgl = sgl; 1799 for (i = 0; i < hvpg_count; i++) { 1800 /* 1801 * 'i' is the index of hv pages in the payload and 1802 * 'hvpgoff' is the offset (in hv pages) of the first 1803 * hv page in the the first page. The relationship 1804 * between the sum of 'i' and 'hvpgoff' and the offset 1805 * (in hv pages) in a payload page ('hvpgoff_in_page') 1806 * is as follow: 1807 * 1808 * |------------------ PAGE -------------------| 1809 * | NR_HV_HYP_PAGES_IN_PAGE hvpgs in total | 1810 * |hvpg|hvpg| ... |hvpg|... |hvpg| 1811 * ^ ^ ^ ^ 1812 * +-hvpgoff-+ +-hvpgoff_in_page-+ 1813 * ^ | 1814 * +--------------------- i ---------------------------+ 1815 */ 1816 unsigned int hvpgoff_in_page = 1817 (i + hvpgoff) % NR_HV_HYP_PAGES_IN_PAGE; 1818 1819 /* 1820 * Two cases that we need to fetch a page: 1821 * 1) i == 0, the first step or 1822 * 2) hvpgoff_in_page == 0, when we reach the boundary 1823 * of a page. 1824 */ 1825 if (hvpgoff_in_page == 0 || i == 0) { 1826 hvpfn = page_to_hvpfn(sg_page(cur_sgl)); 1827 cur_sgl = sg_next(cur_sgl); 1828 } 1829 1830 payload->range.pfn_array[i] = hvpfn + hvpgoff_in_page; 1831 } 1832 } 1833 1834 cmd_request->payload = payload; 1835 cmd_request->payload_sz = payload_sz; 1836 1837 /* Invokes the vsc to start an IO */ 1838 ret = storvsc_do_io(dev, cmd_request, get_cpu()); 1839 put_cpu(); 1840 1841 if (ret == -EAGAIN) { 1842 if (payload_sz > sizeof(cmd_request->mpb)) 1843 kfree(payload); 1844 /* no more space */ 1845 return SCSI_MLQUEUE_DEVICE_BUSY; 1846 } 1847 1848 return 0; 1849 } 1850 1851 static struct scsi_host_template scsi_driver = { 1852 .module = THIS_MODULE, 1853 .name = "storvsc_host_t", 1854 .cmd_size = sizeof(struct storvsc_cmd_request), 1855 .bios_param = storvsc_get_chs, 1856 .queuecommand = storvsc_queuecommand, 1857 .eh_host_reset_handler = storvsc_host_reset_handler, 1858 .proc_name = "storvsc_host", 1859 .eh_timed_out = storvsc_eh_timed_out, 1860 .slave_alloc = storvsc_device_alloc, 1861 .slave_configure = storvsc_device_configure, 1862 .cmd_per_lun = 2048, 1863 .this_id = -1, 1864 /* Make sure we dont get a sg segment crosses a page boundary */ 1865 .dma_boundary = PAGE_SIZE-1, 1866 /* Ensure there are no gaps in presented sgls */ 1867 .virt_boundary_mask = PAGE_SIZE-1, 1868 .no_write_same = 1, 1869 .track_queue_depth = 1, 1870 .change_queue_depth = storvsc_change_queue_depth, 1871 }; 1872 1873 enum { 1874 SCSI_GUID, 1875 IDE_GUID, 1876 SFC_GUID, 1877 }; 1878 1879 static const struct hv_vmbus_device_id id_table[] = { 1880 /* SCSI guid */ 1881 { HV_SCSI_GUID, 1882 .driver_data = SCSI_GUID 1883 }, 1884 /* IDE guid */ 1885 { HV_IDE_GUID, 1886 .driver_data = IDE_GUID 1887 }, 1888 /* Fibre Channel GUID */ 1889 { 1890 HV_SYNTHFC_GUID, 1891 .driver_data = SFC_GUID 1892 }, 1893 { }, 1894 }; 1895 1896 MODULE_DEVICE_TABLE(vmbus, id_table); 1897 1898 static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID }; 1899 1900 static bool hv_dev_is_fc(struct hv_device *hv_dev) 1901 { 1902 return guid_equal(&fc_guid.guid, &hv_dev->dev_type); 1903 } 1904 1905 static int storvsc_probe(struct hv_device *device, 1906 const struct hv_vmbus_device_id *dev_id) 1907 { 1908 int ret; 1909 int num_cpus = num_online_cpus(); 1910 struct Scsi_Host *host; 1911 struct hv_host_device *host_dev; 1912 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1913 bool is_fc = ((dev_id->driver_data == SFC_GUID) ? true : false); 1914 int target = 0; 1915 struct storvsc_device *stor_device; 1916 int max_luns_per_target; 1917 int max_targets; 1918 int max_channels; 1919 int max_sub_channels = 0; 1920 1921 /* 1922 * Based on the windows host we are running on, 1923 * set state to properly communicate with the host. 1924 */ 1925 1926 if (vmbus_proto_version < VERSION_WIN8) { 1927 max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET; 1928 max_targets = STORVSC_IDE_MAX_TARGETS; 1929 max_channels = STORVSC_IDE_MAX_CHANNELS; 1930 } else { 1931 max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET; 1932 max_targets = STORVSC_MAX_TARGETS; 1933 max_channels = STORVSC_MAX_CHANNELS; 1934 /* 1935 * On Windows8 and above, we support sub-channels for storage 1936 * on SCSI and FC controllers. 1937 * The number of sub-channels offerred is based on the number of 1938 * VCPUs in the guest. 1939 */ 1940 if (!dev_is_ide) 1941 max_sub_channels = 1942 (num_cpus - 1) / storvsc_vcpus_per_sub_channel; 1943 } 1944 1945 scsi_driver.can_queue = max_outstanding_req_per_channel * 1946 (max_sub_channels + 1) * 1947 (100 - ring_avail_percent_lowater) / 100; 1948 1949 host = scsi_host_alloc(&scsi_driver, 1950 sizeof(struct hv_host_device)); 1951 if (!host) 1952 return -ENOMEM; 1953 1954 host_dev = shost_priv(host); 1955 memset(host_dev, 0, sizeof(struct hv_host_device)); 1956 1957 host_dev->port = host->host_no; 1958 host_dev->dev = device; 1959 host_dev->host = host; 1960 1961 1962 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1963 if (!stor_device) { 1964 ret = -ENOMEM; 1965 goto err_out0; 1966 } 1967 1968 stor_device->destroy = false; 1969 init_waitqueue_head(&stor_device->waiting_to_drain); 1970 stor_device->device = device; 1971 stor_device->host = host; 1972 stor_device->vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 1973 spin_lock_init(&stor_device->lock); 1974 hv_set_drvdata(device, stor_device); 1975 1976 stor_device->port_number = host->host_no; 1977 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc); 1978 if (ret) 1979 goto err_out1; 1980 1981 host_dev->path = stor_device->path_id; 1982 host_dev->target = stor_device->target_id; 1983 1984 switch (dev_id->driver_data) { 1985 case SFC_GUID: 1986 host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET; 1987 host->max_id = STORVSC_FC_MAX_TARGETS; 1988 host->max_channel = STORVSC_FC_MAX_CHANNELS - 1; 1989 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 1990 host->transportt = fc_transport_template; 1991 #endif 1992 break; 1993 1994 case SCSI_GUID: 1995 host->max_lun = max_luns_per_target; 1996 host->max_id = max_targets; 1997 host->max_channel = max_channels - 1; 1998 break; 1999 2000 default: 2001 host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET; 2002 host->max_id = STORVSC_IDE_MAX_TARGETS; 2003 host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1; 2004 break; 2005 } 2006 /* max cmd length */ 2007 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 2008 2009 /* 2010 * set the table size based on the info we got 2011 * from the host. 2012 */ 2013 host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT); 2014 /* 2015 * For non-IDE disks, the host supports multiple channels. 2016 * Set the number of HW queues we are supporting. 2017 */ 2018 if (!dev_is_ide) 2019 host->nr_hw_queues = num_present_cpus(); 2020 2021 /* 2022 * Set the error handler work queue. 2023 */ 2024 host_dev->handle_error_wq = 2025 alloc_ordered_workqueue("storvsc_error_wq_%d", 2026 WQ_MEM_RECLAIM, 2027 host->host_no); 2028 if (!host_dev->handle_error_wq) { 2029 ret = -ENOMEM; 2030 goto err_out2; 2031 } 2032 INIT_WORK(&host_dev->host_scan_work, storvsc_host_scan); 2033 /* Register the HBA and start the scsi bus scan */ 2034 ret = scsi_add_host(host, &device->device); 2035 if (ret != 0) 2036 goto err_out3; 2037 2038 if (!dev_is_ide) { 2039 scsi_scan_host(host); 2040 } else { 2041 target = (device->dev_instance.b[5] << 8 | 2042 device->dev_instance.b[4]); 2043 ret = scsi_add_device(host, 0, target, 0); 2044 if (ret) 2045 goto err_out4; 2046 } 2047 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2048 if (host->transportt == fc_transport_template) { 2049 struct fc_rport_identifiers ids = { 2050 .roles = FC_PORT_ROLE_FCP_DUMMY_INITIATOR, 2051 }; 2052 2053 fc_host_node_name(host) = stor_device->node_name; 2054 fc_host_port_name(host) = stor_device->port_name; 2055 stor_device->rport = fc_remote_port_add(host, 0, &ids); 2056 if (!stor_device->rport) { 2057 ret = -ENOMEM; 2058 goto err_out4; 2059 } 2060 } 2061 #endif 2062 return 0; 2063 2064 err_out4: 2065 scsi_remove_host(host); 2066 2067 err_out3: 2068 destroy_workqueue(host_dev->handle_error_wq); 2069 2070 err_out2: 2071 /* 2072 * Once we have connected with the host, we would need to 2073 * to invoke storvsc_dev_remove() to rollback this state and 2074 * this call also frees up the stor_device; hence the jump around 2075 * err_out1 label. 2076 */ 2077 storvsc_dev_remove(device); 2078 goto err_out0; 2079 2080 err_out1: 2081 kfree(stor_device->stor_chns); 2082 kfree(stor_device); 2083 2084 err_out0: 2085 scsi_host_put(host); 2086 return ret; 2087 } 2088 2089 /* Change a scsi target's queue depth */ 2090 static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth) 2091 { 2092 if (queue_depth > scsi_driver.can_queue) 2093 queue_depth = scsi_driver.can_queue; 2094 2095 return scsi_change_queue_depth(sdev, queue_depth); 2096 } 2097 2098 static int storvsc_remove(struct hv_device *dev) 2099 { 2100 struct storvsc_device *stor_device = hv_get_drvdata(dev); 2101 struct Scsi_Host *host = stor_device->host; 2102 struct hv_host_device *host_dev = shost_priv(host); 2103 2104 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2105 if (host->transportt == fc_transport_template) { 2106 fc_remote_port_delete(stor_device->rport); 2107 fc_remove_host(host); 2108 } 2109 #endif 2110 destroy_workqueue(host_dev->handle_error_wq); 2111 scsi_remove_host(host); 2112 storvsc_dev_remove(dev); 2113 scsi_host_put(host); 2114 2115 return 0; 2116 } 2117 2118 static int storvsc_suspend(struct hv_device *hv_dev) 2119 { 2120 struct storvsc_device *stor_device = hv_get_drvdata(hv_dev); 2121 struct Scsi_Host *host = stor_device->host; 2122 struct hv_host_device *host_dev = shost_priv(host); 2123 2124 storvsc_wait_to_drain(stor_device); 2125 2126 drain_workqueue(host_dev->handle_error_wq); 2127 2128 vmbus_close(hv_dev->channel); 2129 2130 kfree(stor_device->stor_chns); 2131 stor_device->stor_chns = NULL; 2132 2133 cpumask_clear(&stor_device->alloced_cpus); 2134 2135 return 0; 2136 } 2137 2138 static int storvsc_resume(struct hv_device *hv_dev) 2139 { 2140 int ret; 2141 2142 ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size, 2143 hv_dev_is_fc(hv_dev)); 2144 return ret; 2145 } 2146 2147 static struct hv_driver storvsc_drv = { 2148 .name = KBUILD_MODNAME, 2149 .id_table = id_table, 2150 .probe = storvsc_probe, 2151 .remove = storvsc_remove, 2152 .suspend = storvsc_suspend, 2153 .resume = storvsc_resume, 2154 .driver = { 2155 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 2156 }, 2157 }; 2158 2159 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2160 static struct fc_function_template fc_transport_functions = { 2161 .show_host_node_name = 1, 2162 .show_host_port_name = 1, 2163 }; 2164 #endif 2165 2166 static int __init storvsc_drv_init(void) 2167 { 2168 int ret; 2169 2170 /* 2171 * Divide the ring buffer data size (which is 1 page less 2172 * than the ring buffer size since that page is reserved for 2173 * the ring buffer indices) by the max request size (which is 2174 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 2175 * 2176 * The computation underestimates max_outstanding_req_per_channel 2177 * for Win7 and older hosts because it does not take into account 2178 * the vmscsi_size_delta correction to the max request size. 2179 */ 2180 max_outstanding_req_per_channel = 2181 ((storvsc_ringbuffer_size - PAGE_SIZE) / 2182 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 2183 sizeof(struct vstor_packet) + sizeof(u64), 2184 sizeof(u64))); 2185 2186 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2187 fc_transport_template = fc_attach_transport(&fc_transport_functions); 2188 if (!fc_transport_template) 2189 return -ENODEV; 2190 #endif 2191 2192 ret = vmbus_driver_register(&storvsc_drv); 2193 2194 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2195 if (ret) 2196 fc_release_transport(fc_transport_template); 2197 #endif 2198 2199 return ret; 2200 } 2201 2202 static void __exit storvsc_drv_exit(void) 2203 { 2204 vmbus_driver_unregister(&storvsc_drv); 2205 #if IS_ENABLED(CONFIG_SCSI_FC_ATTRS) 2206 fc_release_transport(fc_transport_template); 2207 #endif 2208 } 2209 2210 MODULE_LICENSE("GPL"); 2211 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 2212 module_init(storvsc_drv_init); 2213 module_exit(storvsc_drv_exit); 2214