1 /* 2 * Copyright (c) 2009, Microsoft Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 15 * Place - Suite 330, Boston, MA 02111-1307 USA. 16 * 17 * Authors: 18 * Haiyang Zhang <haiyangz@microsoft.com> 19 * Hank Janssen <hjanssen@microsoft.com> 20 * K. Y. Srinivasan <kys@microsoft.com> 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/wait.h> 25 #include <linux/sched.h> 26 #include <linux/completion.h> 27 #include <linux/string.h> 28 #include <linux/mm.h> 29 #include <linux/delay.h> 30 #include <linux/init.h> 31 #include <linux/slab.h> 32 #include <linux/module.h> 33 #include <linux/device.h> 34 #include <linux/hyperv.h> 35 #include <linux/mempool.h> 36 #include <scsi/scsi.h> 37 #include <scsi/scsi_cmnd.h> 38 #include <scsi/scsi_host.h> 39 #include <scsi/scsi_device.h> 40 #include <scsi/scsi_tcq.h> 41 #include <scsi/scsi_eh.h> 42 #include <scsi/scsi_devinfo.h> 43 #include <scsi/scsi_dbg.h> 44 45 /* 46 * All wire protocol details (storage protocol between the guest and the host) 47 * are consolidated here. 48 * 49 * Begin protocol definitions. 50 */ 51 52 /* 53 * Version history: 54 * V1 Beta: 0.1 55 * V1 RC < 2008/1/31: 1.0 56 * V1 RC > 2008/1/31: 2.0 57 * Win7: 4.2 58 * Win8: 5.1 59 */ 60 61 62 #define VMSTOR_WIN7_MAJOR 4 63 #define VMSTOR_WIN7_MINOR 2 64 65 #define VMSTOR_WIN8_MAJOR 5 66 #define VMSTOR_WIN8_MINOR 1 67 68 69 /* Packet structure describing virtual storage requests. */ 70 enum vstor_packet_operation { 71 VSTOR_OPERATION_COMPLETE_IO = 1, 72 VSTOR_OPERATION_REMOVE_DEVICE = 2, 73 VSTOR_OPERATION_EXECUTE_SRB = 3, 74 VSTOR_OPERATION_RESET_LUN = 4, 75 VSTOR_OPERATION_RESET_ADAPTER = 5, 76 VSTOR_OPERATION_RESET_BUS = 6, 77 VSTOR_OPERATION_BEGIN_INITIALIZATION = 7, 78 VSTOR_OPERATION_END_INITIALIZATION = 8, 79 VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9, 80 VSTOR_OPERATION_QUERY_PROPERTIES = 10, 81 VSTOR_OPERATION_ENUMERATE_BUS = 11, 82 VSTOR_OPERATION_FCHBA_DATA = 12, 83 VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13, 84 VSTOR_OPERATION_MAXIMUM = 13 85 }; 86 87 /* 88 * WWN packet for Fibre Channel HBA 89 */ 90 91 struct hv_fc_wwn_packet { 92 bool primary_active; 93 u8 reserved1; 94 u8 reserved2; 95 u8 primary_port_wwn[8]; 96 u8 primary_node_wwn[8]; 97 u8 secondary_port_wwn[8]; 98 u8 secondary_node_wwn[8]; 99 }; 100 101 102 103 /* 104 * SRB Flag Bits 105 */ 106 107 #define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002 108 #define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004 109 #define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008 110 #define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010 111 #define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020 112 #define SRB_FLAGS_DATA_IN 0x00000040 113 #define SRB_FLAGS_DATA_OUT 0x00000080 114 #define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000 115 #define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT) 116 #define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100 117 #define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200 118 #define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400 119 120 /* 121 * This flag indicates the request is part of the workflow for processing a D3. 122 */ 123 #define SRB_FLAGS_D3_PROCESSING 0x00000800 124 #define SRB_FLAGS_IS_ACTIVE 0x00010000 125 #define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000 126 #define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000 127 #define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000 128 #define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000 129 #define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000 130 #define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000 131 #define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000 132 #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 133 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 134 135 136 /* 137 * Platform neutral description of a scsi request - 138 * this remains the same across the write regardless of 32/64 bit 139 * note: it's patterned off the SCSI_PASS_THROUGH structure 140 */ 141 #define STORVSC_MAX_CMD_LEN 0x10 142 143 #define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14 144 #define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12 145 146 #define STORVSC_SENSE_BUFFER_SIZE 0x14 147 #define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14 148 149 /* 150 * Sense buffer size changed in win8; have a run-time 151 * variable to track the size we should use. 152 */ 153 static int sense_buffer_size; 154 155 /* 156 * The size of the vmscsi_request has changed in win8. The 157 * additional size is because of new elements added to the 158 * structure. These elements are valid only when we are talking 159 * to a win8 host. 160 * Track the correction to size we need to apply. 161 */ 162 163 static int vmscsi_size_delta; 164 static int vmstor_current_major; 165 static int vmstor_current_minor; 166 167 struct vmscsi_win8_extension { 168 /* 169 * The following were added in Windows 8 170 */ 171 u16 reserve; 172 u8 queue_tag; 173 u8 queue_action; 174 u32 srb_flags; 175 u32 time_out_value; 176 u32 queue_sort_ey; 177 } __packed; 178 179 struct vmscsi_request { 180 u16 length; 181 u8 srb_status; 182 u8 scsi_status; 183 184 u8 port_number; 185 u8 path_id; 186 u8 target_id; 187 u8 lun; 188 189 u8 cdb_length; 190 u8 sense_info_length; 191 u8 data_in; 192 u8 reserved; 193 194 u32 data_transfer_length; 195 196 union { 197 u8 cdb[STORVSC_MAX_CMD_LEN]; 198 u8 sense_data[STORVSC_SENSE_BUFFER_SIZE]; 199 u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING]; 200 }; 201 /* 202 * The following was added in win8. 203 */ 204 struct vmscsi_win8_extension win8_extension; 205 206 } __attribute((packed)); 207 208 209 /* 210 * This structure is sent during the intialization phase to get the different 211 * properties of the channel. 212 */ 213 214 #define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1 215 216 struct vmstorage_channel_properties { 217 u32 reserved; 218 u16 max_channel_cnt; 219 u16 reserved1; 220 221 u32 flags; 222 u32 max_transfer_bytes; 223 224 u64 reserved2; 225 } __packed; 226 227 /* This structure is sent during the storage protocol negotiations. */ 228 struct vmstorage_protocol_version { 229 /* Major (MSW) and minor (LSW) version numbers. */ 230 u16 major_minor; 231 232 /* 233 * Revision number is auto-incremented whenever this file is changed 234 * (See FILL_VMSTOR_REVISION macro above). Mismatch does not 235 * definitely indicate incompatibility--but it does indicate mismatched 236 * builds. 237 * This is only used on the windows side. Just set it to 0. 238 */ 239 u16 revision; 240 } __packed; 241 242 /* Channel Property Flags */ 243 #define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1 244 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2 245 246 struct vstor_packet { 247 /* Requested operation type */ 248 enum vstor_packet_operation operation; 249 250 /* Flags - see below for values */ 251 u32 flags; 252 253 /* Status of the request returned from the server side. */ 254 u32 status; 255 256 /* Data payload area */ 257 union { 258 /* 259 * Structure used to forward SCSI commands from the 260 * client to the server. 261 */ 262 struct vmscsi_request vm_srb; 263 264 /* Structure used to query channel properties. */ 265 struct vmstorage_channel_properties storage_channel_properties; 266 267 /* Used during version negotiations. */ 268 struct vmstorage_protocol_version version; 269 270 /* Fibre channel address packet */ 271 struct hv_fc_wwn_packet wwn_packet; 272 273 /* Number of sub-channels to create */ 274 u16 sub_channel_count; 275 276 /* This will be the maximum of the union members */ 277 u8 buffer[0x34]; 278 }; 279 } __packed; 280 281 /* 282 * Packet Flags: 283 * 284 * This flag indicates that the server should send back a completion for this 285 * packet. 286 */ 287 288 #define REQUEST_COMPLETION_FLAG 0x1 289 290 /* Matches Windows-end */ 291 enum storvsc_request_type { 292 WRITE_TYPE = 0, 293 READ_TYPE, 294 UNKNOWN_TYPE, 295 }; 296 297 /* 298 * SRB status codes and masks; a subset of the codes used here. 299 */ 300 301 #define SRB_STATUS_AUTOSENSE_VALID 0x80 302 #define SRB_STATUS_INVALID_LUN 0x20 303 #define SRB_STATUS_SUCCESS 0x01 304 #define SRB_STATUS_ABORTED 0x02 305 #define SRB_STATUS_ERROR 0x04 306 307 /* 308 * This is the end of Protocol specific defines. 309 */ 310 311 312 /* 313 * We setup a mempool to allocate request structures for this driver 314 * on a per-lun basis. The following define specifies the number of 315 * elements in the pool. 316 */ 317 318 #define STORVSC_MIN_BUF_NR 64 319 static int storvsc_ringbuffer_size = (20 * PAGE_SIZE); 320 321 module_param(storvsc_ringbuffer_size, int, S_IRUGO); 322 MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)"); 323 324 /* 325 * Timeout in seconds for all devices managed by this driver. 326 */ 327 static int storvsc_timeout = 180; 328 329 #define STORVSC_MAX_IO_REQUESTS 128 330 331 /* 332 * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In 333 * reality, the path/target is not used (ie always set to 0) so our 334 * scsi host adapter essentially has 1 bus with 1 target that contains 335 * up to 256 luns. 336 */ 337 #define STORVSC_MAX_LUNS_PER_TARGET 64 338 #define STORVSC_MAX_TARGETS 1 339 #define STORVSC_MAX_CHANNELS 1 340 341 342 343 struct storvsc_cmd_request { 344 struct list_head entry; 345 struct scsi_cmnd *cmd; 346 347 unsigned int bounce_sgl_count; 348 struct scatterlist *bounce_sgl; 349 350 struct hv_device *device; 351 352 /* Synchronize the request/response if needed */ 353 struct completion wait_event; 354 355 unsigned char *sense_buffer; 356 struct hv_multipage_buffer data_buffer; 357 struct vstor_packet vstor_packet; 358 }; 359 360 361 /* A storvsc device is a device object that contains a vmbus channel */ 362 struct storvsc_device { 363 struct hv_device *device; 364 365 bool destroy; 366 bool drain_notify; 367 atomic_t num_outstanding_req; 368 struct Scsi_Host *host; 369 370 wait_queue_head_t waiting_to_drain; 371 372 /* 373 * Each unique Port/Path/Target represents 1 channel ie scsi 374 * controller. In reality, the pathid, targetid is always 0 375 * and the port is set by us 376 */ 377 unsigned int port_number; 378 unsigned char path_id; 379 unsigned char target_id; 380 381 /* Used for vsc/vsp channel reset process */ 382 struct storvsc_cmd_request init_request; 383 struct storvsc_cmd_request reset_request; 384 }; 385 386 struct stor_mem_pools { 387 struct kmem_cache *request_pool; 388 mempool_t *request_mempool; 389 }; 390 391 struct hv_host_device { 392 struct hv_device *dev; 393 unsigned int port; 394 unsigned char path; 395 unsigned char target; 396 }; 397 398 struct storvsc_scan_work { 399 struct work_struct work; 400 struct Scsi_Host *host; 401 uint lun; 402 }; 403 404 static void storvsc_device_scan(struct work_struct *work) 405 { 406 struct storvsc_scan_work *wrk; 407 uint lun; 408 struct scsi_device *sdev; 409 410 wrk = container_of(work, struct storvsc_scan_work, work); 411 lun = wrk->lun; 412 413 sdev = scsi_device_lookup(wrk->host, 0, 0, lun); 414 if (!sdev) 415 goto done; 416 scsi_rescan_device(&sdev->sdev_gendev); 417 scsi_device_put(sdev); 418 419 done: 420 kfree(wrk); 421 } 422 423 static void storvsc_bus_scan(struct work_struct *work) 424 { 425 struct storvsc_scan_work *wrk; 426 int id, order_id; 427 428 wrk = container_of(work, struct storvsc_scan_work, work); 429 for (id = 0; id < wrk->host->max_id; ++id) { 430 if (wrk->host->reverse_ordering) 431 order_id = wrk->host->max_id - id - 1; 432 else 433 order_id = id; 434 435 scsi_scan_target(&wrk->host->shost_gendev, 0, 436 order_id, SCAN_WILD_CARD, 1); 437 } 438 kfree(wrk); 439 } 440 441 static void storvsc_remove_lun(struct work_struct *work) 442 { 443 struct storvsc_scan_work *wrk; 444 struct scsi_device *sdev; 445 446 wrk = container_of(work, struct storvsc_scan_work, work); 447 if (!scsi_host_get(wrk->host)) 448 goto done; 449 450 sdev = scsi_device_lookup(wrk->host, 0, 0, wrk->lun); 451 452 if (sdev) { 453 scsi_remove_device(sdev); 454 scsi_device_put(sdev); 455 } 456 scsi_host_put(wrk->host); 457 458 done: 459 kfree(wrk); 460 } 461 462 /* 463 * Major/minor macros. Minor version is in LSB, meaning that earlier flat 464 * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). 465 */ 466 467 static inline u16 storvsc_get_version(u8 major, u8 minor) 468 { 469 u16 version; 470 471 version = ((major << 8) | minor); 472 return version; 473 } 474 475 /* 476 * We can get incoming messages from the host that are not in response to 477 * messages that we have sent out. An example of this would be messages 478 * received by the guest to notify dynamic addition/removal of LUNs. To 479 * deal with potential race conditions where the driver may be in the 480 * midst of being unloaded when we might receive an unsolicited message 481 * from the host, we have implemented a mechanism to gurantee sequential 482 * consistency: 483 * 484 * 1) Once the device is marked as being destroyed, we will fail all 485 * outgoing messages. 486 * 2) We permit incoming messages when the device is being destroyed, 487 * only to properly account for messages already sent out. 488 */ 489 490 static inline struct storvsc_device *get_out_stor_device( 491 struct hv_device *device) 492 { 493 struct storvsc_device *stor_device; 494 495 stor_device = hv_get_drvdata(device); 496 497 if (stor_device && stor_device->destroy) 498 stor_device = NULL; 499 500 return stor_device; 501 } 502 503 504 static inline void storvsc_wait_to_drain(struct storvsc_device *dev) 505 { 506 dev->drain_notify = true; 507 wait_event(dev->waiting_to_drain, 508 atomic_read(&dev->num_outstanding_req) == 0); 509 dev->drain_notify = false; 510 } 511 512 static inline struct storvsc_device *get_in_stor_device( 513 struct hv_device *device) 514 { 515 struct storvsc_device *stor_device; 516 517 stor_device = hv_get_drvdata(device); 518 519 if (!stor_device) 520 goto get_in_err; 521 522 /* 523 * If the device is being destroyed; allow incoming 524 * traffic only to cleanup outstanding requests. 525 */ 526 527 if (stor_device->destroy && 528 (atomic_read(&stor_device->num_outstanding_req) == 0)) 529 stor_device = NULL; 530 531 get_in_err: 532 return stor_device; 533 534 } 535 536 static void destroy_bounce_buffer(struct scatterlist *sgl, 537 unsigned int sg_count) 538 { 539 int i; 540 struct page *page_buf; 541 542 for (i = 0; i < sg_count; i++) { 543 page_buf = sg_page((&sgl[i])); 544 if (page_buf != NULL) 545 __free_page(page_buf); 546 } 547 548 kfree(sgl); 549 } 550 551 static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) 552 { 553 int i; 554 555 /* No need to check */ 556 if (sg_count < 2) 557 return -1; 558 559 /* We have at least 2 sg entries */ 560 for (i = 0; i < sg_count; i++) { 561 if (i == 0) { 562 /* make sure 1st one does not have hole */ 563 if (sgl[i].offset + sgl[i].length != PAGE_SIZE) 564 return i; 565 } else if (i == sg_count - 1) { 566 /* make sure last one does not have hole */ 567 if (sgl[i].offset != 0) 568 return i; 569 } else { 570 /* make sure no hole in the middle */ 571 if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) 572 return i; 573 } 574 } 575 return -1; 576 } 577 578 static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, 579 unsigned int sg_count, 580 unsigned int len, 581 int write) 582 { 583 int i; 584 int num_pages; 585 struct scatterlist *bounce_sgl; 586 struct page *page_buf; 587 unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE); 588 589 num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT; 590 591 bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC); 592 if (!bounce_sgl) 593 return NULL; 594 595 sg_init_table(bounce_sgl, num_pages); 596 for (i = 0; i < num_pages; i++) { 597 page_buf = alloc_page(GFP_ATOMIC); 598 if (!page_buf) 599 goto cleanup; 600 sg_set_page(&bounce_sgl[i], page_buf, buf_len, 0); 601 } 602 603 return bounce_sgl; 604 605 cleanup: 606 destroy_bounce_buffer(bounce_sgl, num_pages); 607 return NULL; 608 } 609 610 /* Disgusting wrapper functions */ 611 static inline unsigned long sg_kmap_atomic(struct scatterlist *sgl, int idx) 612 { 613 void *addr = kmap_atomic(sg_page(sgl + idx)); 614 return (unsigned long)addr; 615 } 616 617 static inline void sg_kunmap_atomic(unsigned long addr) 618 { 619 kunmap_atomic((void *)addr); 620 } 621 622 623 /* Assume the original sgl has enough room */ 624 static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, 625 struct scatterlist *bounce_sgl, 626 unsigned int orig_sgl_count, 627 unsigned int bounce_sgl_count) 628 { 629 int i; 630 int j = 0; 631 unsigned long src, dest; 632 unsigned int srclen, destlen, copylen; 633 unsigned int total_copied = 0; 634 unsigned long bounce_addr = 0; 635 unsigned long dest_addr = 0; 636 unsigned long flags; 637 638 local_irq_save(flags); 639 640 for (i = 0; i < orig_sgl_count; i++) { 641 dest_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; 642 dest = dest_addr; 643 destlen = orig_sgl[i].length; 644 645 if (bounce_addr == 0) 646 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 647 648 while (destlen) { 649 src = bounce_addr + bounce_sgl[j].offset; 650 srclen = bounce_sgl[j].length - bounce_sgl[j].offset; 651 652 copylen = min(srclen, destlen); 653 memcpy((void *)dest, (void *)src, copylen); 654 655 total_copied += copylen; 656 bounce_sgl[j].offset += copylen; 657 destlen -= copylen; 658 dest += copylen; 659 660 if (bounce_sgl[j].offset == bounce_sgl[j].length) { 661 /* full */ 662 sg_kunmap_atomic(bounce_addr); 663 j++; 664 665 /* 666 * It is possible that the number of elements 667 * in the bounce buffer may not be equal to 668 * the number of elements in the original 669 * scatter list. Handle this correctly. 670 */ 671 672 if (j == bounce_sgl_count) { 673 /* 674 * We are done; cleanup and return. 675 */ 676 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); 677 local_irq_restore(flags); 678 return total_copied; 679 } 680 681 /* if we need to use another bounce buffer */ 682 if (destlen || i != orig_sgl_count - 1) 683 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 684 } else if (destlen == 0 && i == orig_sgl_count - 1) { 685 /* unmap the last bounce that is < PAGE_SIZE */ 686 sg_kunmap_atomic(bounce_addr); 687 } 688 } 689 690 sg_kunmap_atomic(dest_addr - orig_sgl[i].offset); 691 } 692 693 local_irq_restore(flags); 694 695 return total_copied; 696 } 697 698 /* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */ 699 static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, 700 struct scatterlist *bounce_sgl, 701 unsigned int orig_sgl_count) 702 { 703 int i; 704 int j = 0; 705 unsigned long src, dest; 706 unsigned int srclen, destlen, copylen; 707 unsigned int total_copied = 0; 708 unsigned long bounce_addr = 0; 709 unsigned long src_addr = 0; 710 unsigned long flags; 711 712 local_irq_save(flags); 713 714 for (i = 0; i < orig_sgl_count; i++) { 715 src_addr = sg_kmap_atomic(orig_sgl,i) + orig_sgl[i].offset; 716 src = src_addr; 717 srclen = orig_sgl[i].length; 718 719 if (bounce_addr == 0) 720 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 721 722 while (srclen) { 723 /* assume bounce offset always == 0 */ 724 dest = bounce_addr + bounce_sgl[j].length; 725 destlen = PAGE_SIZE - bounce_sgl[j].length; 726 727 copylen = min(srclen, destlen); 728 memcpy((void *)dest, (void *)src, copylen); 729 730 total_copied += copylen; 731 bounce_sgl[j].length += copylen; 732 srclen -= copylen; 733 src += copylen; 734 735 if (bounce_sgl[j].length == PAGE_SIZE) { 736 /* full..move to next entry */ 737 sg_kunmap_atomic(bounce_addr); 738 j++; 739 740 /* if we need to use another bounce buffer */ 741 if (srclen || i != orig_sgl_count - 1) 742 bounce_addr = sg_kmap_atomic(bounce_sgl,j); 743 744 } else if (srclen == 0 && i == orig_sgl_count - 1) { 745 /* unmap the last bounce that is < PAGE_SIZE */ 746 sg_kunmap_atomic(bounce_addr); 747 } 748 } 749 750 sg_kunmap_atomic(src_addr - orig_sgl[i].offset); 751 } 752 753 local_irq_restore(flags); 754 755 return total_copied; 756 } 757 758 static int storvsc_channel_init(struct hv_device *device) 759 { 760 struct storvsc_device *stor_device; 761 struct storvsc_cmd_request *request; 762 struct vstor_packet *vstor_packet; 763 int ret, t; 764 765 stor_device = get_out_stor_device(device); 766 if (!stor_device) 767 return -ENODEV; 768 769 request = &stor_device->init_request; 770 vstor_packet = &request->vstor_packet; 771 772 /* 773 * Now, initiate the vsc/vsp initialization protocol on the open 774 * channel 775 */ 776 memset(request, 0, sizeof(struct storvsc_cmd_request)); 777 init_completion(&request->wait_event); 778 vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION; 779 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 780 781 ret = vmbus_sendpacket(device->channel, vstor_packet, 782 (sizeof(struct vstor_packet) - 783 vmscsi_size_delta), 784 (unsigned long)request, 785 VM_PKT_DATA_INBAND, 786 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 787 if (ret != 0) 788 goto cleanup; 789 790 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 791 if (t == 0) { 792 ret = -ETIMEDOUT; 793 goto cleanup; 794 } 795 796 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 797 vstor_packet->status != 0) 798 goto cleanup; 799 800 801 /* reuse the packet for version range supported */ 802 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 803 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION; 804 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 805 806 vstor_packet->version.major_minor = 807 storvsc_get_version(vmstor_current_major, vmstor_current_minor); 808 809 /* 810 * The revision number is only used in Windows; set it to 0. 811 */ 812 vstor_packet->version.revision = 0; 813 814 ret = vmbus_sendpacket(device->channel, vstor_packet, 815 (sizeof(struct vstor_packet) - 816 vmscsi_size_delta), 817 (unsigned long)request, 818 VM_PKT_DATA_INBAND, 819 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 820 if (ret != 0) 821 goto cleanup; 822 823 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 824 if (t == 0) { 825 ret = -ETIMEDOUT; 826 goto cleanup; 827 } 828 829 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 830 vstor_packet->status != 0) 831 goto cleanup; 832 833 834 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 835 vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES; 836 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 837 838 ret = vmbus_sendpacket(device->channel, vstor_packet, 839 (sizeof(struct vstor_packet) - 840 vmscsi_size_delta), 841 (unsigned long)request, 842 VM_PKT_DATA_INBAND, 843 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 844 845 if (ret != 0) 846 goto cleanup; 847 848 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 849 if (t == 0) { 850 ret = -ETIMEDOUT; 851 goto cleanup; 852 } 853 854 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 855 vstor_packet->status != 0) 856 goto cleanup; 857 858 memset(vstor_packet, 0, sizeof(struct vstor_packet)); 859 vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION; 860 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 861 862 ret = vmbus_sendpacket(device->channel, vstor_packet, 863 (sizeof(struct vstor_packet) - 864 vmscsi_size_delta), 865 (unsigned long)request, 866 VM_PKT_DATA_INBAND, 867 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 868 869 if (ret != 0) 870 goto cleanup; 871 872 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 873 if (t == 0) { 874 ret = -ETIMEDOUT; 875 goto cleanup; 876 } 877 878 if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO || 879 vstor_packet->status != 0) 880 goto cleanup; 881 882 883 cleanup: 884 return ret; 885 } 886 887 static void storvsc_handle_error(struct vmscsi_request *vm_srb, 888 struct scsi_cmnd *scmnd, 889 struct Scsi_Host *host, 890 u8 asc, u8 ascq) 891 { 892 struct storvsc_scan_work *wrk; 893 void (*process_err_fn)(struct work_struct *work); 894 bool do_work = false; 895 896 switch (vm_srb->srb_status) { 897 case SRB_STATUS_ERROR: 898 /* 899 * If there is an error; offline the device since all 900 * error recovery strategies would have already been 901 * deployed on the host side. However, if the command 902 * were a pass-through command deal with it appropriately. 903 */ 904 switch (scmnd->cmnd[0]) { 905 case ATA_16: 906 case ATA_12: 907 set_host_byte(scmnd, DID_PASSTHROUGH); 908 break; 909 default: 910 set_host_byte(scmnd, DID_TARGET_FAILURE); 911 } 912 break; 913 case SRB_STATUS_INVALID_LUN: 914 do_work = true; 915 process_err_fn = storvsc_remove_lun; 916 break; 917 case (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID): 918 if ((asc == 0x2a) && (ascq == 0x9)) { 919 do_work = true; 920 process_err_fn = storvsc_device_scan; 921 /* 922 * Retry the I/O that trigerred this. 923 */ 924 set_host_byte(scmnd, DID_REQUEUE); 925 } 926 break; 927 } 928 929 if (!do_work) 930 return; 931 932 /* 933 * We need to schedule work to process this error; schedule it. 934 */ 935 wrk = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 936 if (!wrk) { 937 set_host_byte(scmnd, DID_TARGET_FAILURE); 938 return; 939 } 940 941 wrk->host = host; 942 wrk->lun = vm_srb->lun; 943 INIT_WORK(&wrk->work, process_err_fn); 944 schedule_work(&wrk->work); 945 } 946 947 948 static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request) 949 { 950 struct scsi_cmnd *scmnd = cmd_request->cmd; 951 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 952 void (*scsi_done_fn)(struct scsi_cmnd *); 953 struct scsi_sense_hdr sense_hdr; 954 struct vmscsi_request *vm_srb; 955 struct stor_mem_pools *memp = scmnd->device->hostdata; 956 struct Scsi_Host *host; 957 struct storvsc_device *stor_dev; 958 struct hv_device *dev = host_dev->dev; 959 960 stor_dev = get_in_stor_device(dev); 961 host = stor_dev->host; 962 963 vm_srb = &cmd_request->vstor_packet.vm_srb; 964 if (cmd_request->bounce_sgl_count) { 965 if (vm_srb->data_in == READ_TYPE) 966 copy_from_bounce_buffer(scsi_sglist(scmnd), 967 cmd_request->bounce_sgl, 968 scsi_sg_count(scmnd), 969 cmd_request->bounce_sgl_count); 970 destroy_bounce_buffer(cmd_request->bounce_sgl, 971 cmd_request->bounce_sgl_count); 972 } 973 974 scmnd->result = vm_srb->scsi_status; 975 976 if (scmnd->result) { 977 if (scsi_normalize_sense(scmnd->sense_buffer, 978 SCSI_SENSE_BUFFERSIZE, &sense_hdr)) 979 scsi_print_sense_hdr("storvsc", &sense_hdr); 980 } 981 982 if (vm_srb->srb_status != SRB_STATUS_SUCCESS) 983 storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc, 984 sense_hdr.ascq); 985 986 scsi_set_resid(scmnd, 987 cmd_request->data_buffer.len - 988 vm_srb->data_transfer_length); 989 990 scsi_done_fn = scmnd->scsi_done; 991 992 scmnd->host_scribble = NULL; 993 scmnd->scsi_done = NULL; 994 995 scsi_done_fn(scmnd); 996 997 mempool_free(cmd_request, memp->request_mempool); 998 } 999 1000 static void storvsc_on_io_completion(struct hv_device *device, 1001 struct vstor_packet *vstor_packet, 1002 struct storvsc_cmd_request *request) 1003 { 1004 struct storvsc_device *stor_device; 1005 struct vstor_packet *stor_pkt; 1006 1007 stor_device = hv_get_drvdata(device); 1008 stor_pkt = &request->vstor_packet; 1009 1010 /* 1011 * The current SCSI handling on the host side does 1012 * not correctly handle: 1013 * INQUIRY command with page code parameter set to 0x80 1014 * MODE_SENSE command with cmd[2] == 0x1c 1015 * 1016 * Setup srb and scsi status so this won't be fatal. 1017 * We do this so we can distinguish truly fatal failues 1018 * (srb status == 0x4) and off-line the device in that case. 1019 */ 1020 1021 if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) || 1022 (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) { 1023 vstor_packet->vm_srb.scsi_status = 0; 1024 vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS; 1025 } 1026 1027 1028 /* Copy over the status...etc */ 1029 stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status; 1030 stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status; 1031 stor_pkt->vm_srb.sense_info_length = 1032 vstor_packet->vm_srb.sense_info_length; 1033 1034 if (vstor_packet->vm_srb.scsi_status != 0 || 1035 vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){ 1036 dev_warn(&device->device, 1037 "cmd 0x%x scsi status 0x%x srb status 0x%x\n", 1038 stor_pkt->vm_srb.cdb[0], 1039 vstor_packet->vm_srb.scsi_status, 1040 vstor_packet->vm_srb.srb_status); 1041 } 1042 1043 if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) { 1044 /* CHECK_CONDITION */ 1045 if (vstor_packet->vm_srb.srb_status & 1046 SRB_STATUS_AUTOSENSE_VALID) { 1047 /* autosense data available */ 1048 dev_warn(&device->device, 1049 "stor pkt %p autosense data valid - len %d\n", 1050 request, 1051 vstor_packet->vm_srb.sense_info_length); 1052 1053 memcpy(request->sense_buffer, 1054 vstor_packet->vm_srb.sense_data, 1055 vstor_packet->vm_srb.sense_info_length); 1056 1057 } 1058 } 1059 1060 stor_pkt->vm_srb.data_transfer_length = 1061 vstor_packet->vm_srb.data_transfer_length; 1062 1063 storvsc_command_completion(request); 1064 1065 if (atomic_dec_and_test(&stor_device->num_outstanding_req) && 1066 stor_device->drain_notify) 1067 wake_up(&stor_device->waiting_to_drain); 1068 1069 1070 } 1071 1072 static void storvsc_on_receive(struct hv_device *device, 1073 struct vstor_packet *vstor_packet, 1074 struct storvsc_cmd_request *request) 1075 { 1076 struct storvsc_scan_work *work; 1077 struct storvsc_device *stor_device; 1078 1079 switch (vstor_packet->operation) { 1080 case VSTOR_OPERATION_COMPLETE_IO: 1081 storvsc_on_io_completion(device, vstor_packet, request); 1082 break; 1083 1084 case VSTOR_OPERATION_REMOVE_DEVICE: 1085 case VSTOR_OPERATION_ENUMERATE_BUS: 1086 stor_device = get_in_stor_device(device); 1087 work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC); 1088 if (!work) 1089 return; 1090 1091 INIT_WORK(&work->work, storvsc_bus_scan); 1092 work->host = stor_device->host; 1093 schedule_work(&work->work); 1094 break; 1095 1096 default: 1097 break; 1098 } 1099 } 1100 1101 static void storvsc_on_channel_callback(void *context) 1102 { 1103 struct hv_device *device = (struct hv_device *)context; 1104 struct storvsc_device *stor_device; 1105 u32 bytes_recvd; 1106 u64 request_id; 1107 unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)]; 1108 struct storvsc_cmd_request *request; 1109 int ret; 1110 1111 1112 stor_device = get_in_stor_device(device); 1113 if (!stor_device) 1114 return; 1115 1116 do { 1117 ret = vmbus_recvpacket(device->channel, packet, 1118 ALIGN((sizeof(struct vstor_packet) - 1119 vmscsi_size_delta), 8), 1120 &bytes_recvd, &request_id); 1121 if (ret == 0 && bytes_recvd > 0) { 1122 1123 request = (struct storvsc_cmd_request *) 1124 (unsigned long)request_id; 1125 1126 if ((request == &stor_device->init_request) || 1127 (request == &stor_device->reset_request)) { 1128 1129 memcpy(&request->vstor_packet, packet, 1130 (sizeof(struct vstor_packet) - 1131 vmscsi_size_delta)); 1132 complete(&request->wait_event); 1133 } else { 1134 storvsc_on_receive(device, 1135 (struct vstor_packet *)packet, 1136 request); 1137 } 1138 } else { 1139 break; 1140 } 1141 } while (1); 1142 1143 return; 1144 } 1145 1146 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size) 1147 { 1148 struct vmstorage_channel_properties props; 1149 int ret; 1150 1151 memset(&props, 0, sizeof(struct vmstorage_channel_properties)); 1152 1153 ret = vmbus_open(device->channel, 1154 ring_size, 1155 ring_size, 1156 (void *)&props, 1157 sizeof(struct vmstorage_channel_properties), 1158 storvsc_on_channel_callback, device); 1159 1160 if (ret != 0) 1161 return ret; 1162 1163 ret = storvsc_channel_init(device); 1164 1165 return ret; 1166 } 1167 1168 static int storvsc_dev_remove(struct hv_device *device) 1169 { 1170 struct storvsc_device *stor_device; 1171 unsigned long flags; 1172 1173 stor_device = hv_get_drvdata(device); 1174 1175 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1176 stor_device->destroy = true; 1177 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1178 1179 /* 1180 * At this point, all outbound traffic should be disable. We 1181 * only allow inbound traffic (responses) to proceed so that 1182 * outstanding requests can be completed. 1183 */ 1184 1185 storvsc_wait_to_drain(stor_device); 1186 1187 /* 1188 * Since we have already drained, we don't need to busy wait 1189 * as was done in final_release_stor_device() 1190 * Note that we cannot set the ext pointer to NULL until 1191 * we have drained - to drain the outgoing packets, we need to 1192 * allow incoming packets. 1193 */ 1194 spin_lock_irqsave(&device->channel->inbound_lock, flags); 1195 hv_set_drvdata(device, NULL); 1196 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 1197 1198 /* Close the channel */ 1199 vmbus_close(device->channel); 1200 1201 kfree(stor_device); 1202 return 0; 1203 } 1204 1205 static int storvsc_do_io(struct hv_device *device, 1206 struct storvsc_cmd_request *request) 1207 { 1208 struct storvsc_device *stor_device; 1209 struct vstor_packet *vstor_packet; 1210 int ret = 0; 1211 1212 vstor_packet = &request->vstor_packet; 1213 stor_device = get_out_stor_device(device); 1214 1215 if (!stor_device) 1216 return -ENODEV; 1217 1218 1219 request->device = device; 1220 1221 1222 vstor_packet->flags |= REQUEST_COMPLETION_FLAG; 1223 1224 vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) - 1225 vmscsi_size_delta); 1226 1227 1228 vstor_packet->vm_srb.sense_info_length = sense_buffer_size; 1229 1230 1231 vstor_packet->vm_srb.data_transfer_length = 1232 request->data_buffer.len; 1233 1234 vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB; 1235 1236 if (request->data_buffer.len) { 1237 ret = vmbus_sendpacket_multipagebuffer(device->channel, 1238 &request->data_buffer, 1239 vstor_packet, 1240 (sizeof(struct vstor_packet) - 1241 vmscsi_size_delta), 1242 (unsigned long)request); 1243 } else { 1244 ret = vmbus_sendpacket(device->channel, vstor_packet, 1245 (sizeof(struct vstor_packet) - 1246 vmscsi_size_delta), 1247 (unsigned long)request, 1248 VM_PKT_DATA_INBAND, 1249 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1250 } 1251 1252 if (ret != 0) 1253 return ret; 1254 1255 atomic_inc(&stor_device->num_outstanding_req); 1256 1257 return ret; 1258 } 1259 1260 static int storvsc_device_alloc(struct scsi_device *sdevice) 1261 { 1262 struct stor_mem_pools *memp; 1263 int number = STORVSC_MIN_BUF_NR; 1264 1265 memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL); 1266 if (!memp) 1267 return -ENOMEM; 1268 1269 memp->request_pool = 1270 kmem_cache_create(dev_name(&sdevice->sdev_dev), 1271 sizeof(struct storvsc_cmd_request), 0, 1272 SLAB_HWCACHE_ALIGN, NULL); 1273 1274 if (!memp->request_pool) 1275 goto err0; 1276 1277 memp->request_mempool = mempool_create(number, mempool_alloc_slab, 1278 mempool_free_slab, 1279 memp->request_pool); 1280 1281 if (!memp->request_mempool) 1282 goto err1; 1283 1284 sdevice->hostdata = memp; 1285 1286 return 0; 1287 1288 err1: 1289 kmem_cache_destroy(memp->request_pool); 1290 1291 err0: 1292 kfree(memp); 1293 return -ENOMEM; 1294 } 1295 1296 static void storvsc_device_destroy(struct scsi_device *sdevice) 1297 { 1298 struct stor_mem_pools *memp = sdevice->hostdata; 1299 1300 mempool_destroy(memp->request_mempool); 1301 kmem_cache_destroy(memp->request_pool); 1302 kfree(memp); 1303 sdevice->hostdata = NULL; 1304 } 1305 1306 static int storvsc_device_configure(struct scsi_device *sdevice) 1307 { 1308 scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, 1309 STORVSC_MAX_IO_REQUESTS); 1310 1311 blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); 1312 1313 blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); 1314 1315 blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ)); 1316 1317 sdevice->no_write_same = 1; 1318 1319 return 0; 1320 } 1321 1322 static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, 1323 sector_t capacity, int *info) 1324 { 1325 sector_t nsect = capacity; 1326 sector_t cylinders = nsect; 1327 int heads, sectors_pt; 1328 1329 /* 1330 * We are making up these values; let us keep it simple. 1331 */ 1332 heads = 0xff; 1333 sectors_pt = 0x3f; /* Sectors per track */ 1334 sector_div(cylinders, heads * sectors_pt); 1335 if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect) 1336 cylinders = 0xffff; 1337 1338 info[0] = heads; 1339 info[1] = sectors_pt; 1340 info[2] = (int)cylinders; 1341 1342 return 0; 1343 } 1344 1345 static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) 1346 { 1347 struct hv_host_device *host_dev = shost_priv(scmnd->device->host); 1348 struct hv_device *device = host_dev->dev; 1349 1350 struct storvsc_device *stor_device; 1351 struct storvsc_cmd_request *request; 1352 struct vstor_packet *vstor_packet; 1353 int ret, t; 1354 1355 1356 stor_device = get_out_stor_device(device); 1357 if (!stor_device) 1358 return FAILED; 1359 1360 request = &stor_device->reset_request; 1361 vstor_packet = &request->vstor_packet; 1362 1363 init_completion(&request->wait_event); 1364 1365 vstor_packet->operation = VSTOR_OPERATION_RESET_BUS; 1366 vstor_packet->flags = REQUEST_COMPLETION_FLAG; 1367 vstor_packet->vm_srb.path_id = stor_device->path_id; 1368 1369 ret = vmbus_sendpacket(device->channel, vstor_packet, 1370 (sizeof(struct vstor_packet) - 1371 vmscsi_size_delta), 1372 (unsigned long)&stor_device->reset_request, 1373 VM_PKT_DATA_INBAND, 1374 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1375 if (ret != 0) 1376 return FAILED; 1377 1378 t = wait_for_completion_timeout(&request->wait_event, 5*HZ); 1379 if (t == 0) 1380 return TIMEOUT_ERROR; 1381 1382 1383 /* 1384 * At this point, all outstanding requests in the adapter 1385 * should have been flushed out and return to us 1386 * There is a potential race here where the host may be in 1387 * the process of responding when we return from here. 1388 * Just wait for all in-transit packets to be accounted for 1389 * before we return from here. 1390 */ 1391 storvsc_wait_to_drain(stor_device); 1392 1393 return SUCCESS; 1394 } 1395 1396 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) 1397 { 1398 bool allowed = true; 1399 u8 scsi_op = scmnd->cmnd[0]; 1400 1401 switch (scsi_op) { 1402 /* the host does not handle WRITE_SAME, log accident usage */ 1403 case WRITE_SAME: 1404 /* 1405 * smartd sends this command and the host does not handle 1406 * this. So, don't send it. 1407 */ 1408 case SET_WINDOW: 1409 scmnd->result = ILLEGAL_REQUEST << 16; 1410 allowed = false; 1411 break; 1412 default: 1413 break; 1414 } 1415 return allowed; 1416 } 1417 1418 static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) 1419 { 1420 int ret; 1421 struct hv_host_device *host_dev = shost_priv(host); 1422 struct hv_device *dev = host_dev->dev; 1423 struct storvsc_cmd_request *cmd_request; 1424 unsigned int request_size = 0; 1425 int i; 1426 struct scatterlist *sgl; 1427 unsigned int sg_count = 0; 1428 struct vmscsi_request *vm_srb; 1429 struct stor_mem_pools *memp = scmnd->device->hostdata; 1430 1431 if (!storvsc_scsi_cmd_ok(scmnd)) { 1432 scmnd->scsi_done(scmnd); 1433 return 0; 1434 } 1435 1436 request_size = sizeof(struct storvsc_cmd_request); 1437 1438 cmd_request = mempool_alloc(memp->request_mempool, 1439 GFP_ATOMIC); 1440 1441 /* 1442 * We might be invoked in an interrupt context; hence 1443 * mempool_alloc() can fail. 1444 */ 1445 if (!cmd_request) 1446 return SCSI_MLQUEUE_DEVICE_BUSY; 1447 1448 memset(cmd_request, 0, sizeof(struct storvsc_cmd_request)); 1449 1450 /* Setup the cmd request */ 1451 cmd_request->cmd = scmnd; 1452 1453 scmnd->host_scribble = (unsigned char *)cmd_request; 1454 1455 vm_srb = &cmd_request->vstor_packet.vm_srb; 1456 vm_srb->win8_extension.time_out_value = 60; 1457 1458 1459 /* Build the SRB */ 1460 switch (scmnd->sc_data_direction) { 1461 case DMA_TO_DEVICE: 1462 vm_srb->data_in = WRITE_TYPE; 1463 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT; 1464 vm_srb->win8_extension.srb_flags |= 1465 (SRB_FLAGS_QUEUE_ACTION_ENABLE | 1466 SRB_FLAGS_DISABLE_SYNCH_TRANSFER); 1467 break; 1468 case DMA_FROM_DEVICE: 1469 vm_srb->data_in = READ_TYPE; 1470 vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; 1471 vm_srb->win8_extension.srb_flags |= 1472 (SRB_FLAGS_QUEUE_ACTION_ENABLE | 1473 SRB_FLAGS_DISABLE_SYNCH_TRANSFER); 1474 break; 1475 default: 1476 vm_srb->data_in = UNKNOWN_TYPE; 1477 vm_srb->win8_extension.srb_flags = 0; 1478 break; 1479 } 1480 1481 1482 vm_srb->port_number = host_dev->port; 1483 vm_srb->path_id = scmnd->device->channel; 1484 vm_srb->target_id = scmnd->device->id; 1485 vm_srb->lun = scmnd->device->lun; 1486 1487 vm_srb->cdb_length = scmnd->cmd_len; 1488 1489 memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length); 1490 1491 cmd_request->sense_buffer = scmnd->sense_buffer; 1492 1493 1494 cmd_request->data_buffer.len = scsi_bufflen(scmnd); 1495 if (scsi_sg_count(scmnd)) { 1496 sgl = (struct scatterlist *)scsi_sglist(scmnd); 1497 sg_count = scsi_sg_count(scmnd); 1498 1499 /* check if we need to bounce the sgl */ 1500 if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) { 1501 cmd_request->bounce_sgl = 1502 create_bounce_buffer(sgl, scsi_sg_count(scmnd), 1503 scsi_bufflen(scmnd), 1504 vm_srb->data_in); 1505 if (!cmd_request->bounce_sgl) { 1506 ret = SCSI_MLQUEUE_HOST_BUSY; 1507 goto queue_error; 1508 } 1509 1510 cmd_request->bounce_sgl_count = 1511 ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> 1512 PAGE_SHIFT; 1513 1514 if (vm_srb->data_in == WRITE_TYPE) 1515 copy_to_bounce_buffer(sgl, 1516 cmd_request->bounce_sgl, 1517 scsi_sg_count(scmnd)); 1518 1519 sgl = cmd_request->bounce_sgl; 1520 sg_count = cmd_request->bounce_sgl_count; 1521 } 1522 1523 cmd_request->data_buffer.offset = sgl[0].offset; 1524 1525 for (i = 0; i < sg_count; i++) 1526 cmd_request->data_buffer.pfn_array[i] = 1527 page_to_pfn(sg_page((&sgl[i]))); 1528 1529 } else if (scsi_sglist(scmnd)) { 1530 cmd_request->data_buffer.offset = 1531 virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); 1532 cmd_request->data_buffer.pfn_array[0] = 1533 virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; 1534 } 1535 1536 /* Invokes the vsc to start an IO */ 1537 ret = storvsc_do_io(dev, cmd_request); 1538 1539 if (ret == -EAGAIN) { 1540 /* no more space */ 1541 1542 if (cmd_request->bounce_sgl_count) { 1543 destroy_bounce_buffer(cmd_request->bounce_sgl, 1544 cmd_request->bounce_sgl_count); 1545 1546 ret = SCSI_MLQUEUE_DEVICE_BUSY; 1547 goto queue_error; 1548 } 1549 } 1550 1551 return 0; 1552 1553 queue_error: 1554 mempool_free(cmd_request, memp->request_mempool); 1555 scmnd->host_scribble = NULL; 1556 return ret; 1557 } 1558 1559 static struct scsi_host_template scsi_driver = { 1560 .module = THIS_MODULE, 1561 .name = "storvsc_host_t", 1562 .bios_param = storvsc_get_chs, 1563 .queuecommand = storvsc_queuecommand, 1564 .eh_host_reset_handler = storvsc_host_reset_handler, 1565 .slave_alloc = storvsc_device_alloc, 1566 .slave_destroy = storvsc_device_destroy, 1567 .slave_configure = storvsc_device_configure, 1568 .cmd_per_lun = 1, 1569 /* 64 max_queue * 1 target */ 1570 .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, 1571 .this_id = -1, 1572 /* no use setting to 0 since ll_blk_rw reset it to 1 */ 1573 /* currently 32 */ 1574 .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT, 1575 .use_clustering = DISABLE_CLUSTERING, 1576 /* Make sure we dont get a sg segment crosses a page boundary */ 1577 .dma_boundary = PAGE_SIZE-1, 1578 }; 1579 1580 enum { 1581 SCSI_GUID, 1582 IDE_GUID, 1583 }; 1584 1585 static const struct hv_vmbus_device_id id_table[] = { 1586 /* SCSI guid */ 1587 { HV_SCSI_GUID, 1588 .driver_data = SCSI_GUID 1589 }, 1590 /* IDE guid */ 1591 { HV_IDE_GUID, 1592 .driver_data = IDE_GUID 1593 }, 1594 { }, 1595 }; 1596 1597 MODULE_DEVICE_TABLE(vmbus, id_table); 1598 1599 static int storvsc_probe(struct hv_device *device, 1600 const struct hv_vmbus_device_id *dev_id) 1601 { 1602 int ret; 1603 struct Scsi_Host *host; 1604 struct hv_host_device *host_dev; 1605 bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false); 1606 int target = 0; 1607 struct storvsc_device *stor_device; 1608 1609 /* 1610 * Based on the windows host we are running on, 1611 * set state to properly communicate with the host. 1612 */ 1613 1614 if (vmbus_proto_version == VERSION_WIN8) { 1615 sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE; 1616 vmscsi_size_delta = 0; 1617 vmstor_current_major = VMSTOR_WIN8_MAJOR; 1618 vmstor_current_minor = VMSTOR_WIN8_MINOR; 1619 } else { 1620 sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE; 1621 vmscsi_size_delta = sizeof(struct vmscsi_win8_extension); 1622 vmstor_current_major = VMSTOR_WIN7_MAJOR; 1623 vmstor_current_minor = VMSTOR_WIN7_MINOR; 1624 } 1625 1626 1627 host = scsi_host_alloc(&scsi_driver, 1628 sizeof(struct hv_host_device)); 1629 if (!host) 1630 return -ENOMEM; 1631 1632 host_dev = shost_priv(host); 1633 memset(host_dev, 0, sizeof(struct hv_host_device)); 1634 1635 host_dev->port = host->host_no; 1636 host_dev->dev = device; 1637 1638 1639 stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL); 1640 if (!stor_device) { 1641 ret = -ENOMEM; 1642 goto err_out0; 1643 } 1644 1645 stor_device->destroy = false; 1646 init_waitqueue_head(&stor_device->waiting_to_drain); 1647 stor_device->device = device; 1648 stor_device->host = host; 1649 hv_set_drvdata(device, stor_device); 1650 1651 stor_device->port_number = host->host_no; 1652 ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size); 1653 if (ret) 1654 goto err_out1; 1655 1656 host_dev->path = stor_device->path_id; 1657 host_dev->target = stor_device->target_id; 1658 1659 /* max # of devices per target */ 1660 host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; 1661 /* max # of targets per channel */ 1662 host->max_id = STORVSC_MAX_TARGETS; 1663 /* max # of channels */ 1664 host->max_channel = STORVSC_MAX_CHANNELS - 1; 1665 /* max cmd length */ 1666 host->max_cmd_len = STORVSC_MAX_CMD_LEN; 1667 1668 /* Register the HBA and start the scsi bus scan */ 1669 ret = scsi_add_host(host, &device->device); 1670 if (ret != 0) 1671 goto err_out2; 1672 1673 if (!dev_is_ide) { 1674 scsi_scan_host(host); 1675 } else { 1676 target = (device->dev_instance.b[5] << 8 | 1677 device->dev_instance.b[4]); 1678 ret = scsi_add_device(host, 0, target, 0); 1679 if (ret) { 1680 scsi_remove_host(host); 1681 goto err_out2; 1682 } 1683 } 1684 return 0; 1685 1686 err_out2: 1687 /* 1688 * Once we have connected with the host, we would need to 1689 * to invoke storvsc_dev_remove() to rollback this state and 1690 * this call also frees up the stor_device; hence the jump around 1691 * err_out1 label. 1692 */ 1693 storvsc_dev_remove(device); 1694 goto err_out0; 1695 1696 err_out1: 1697 kfree(stor_device); 1698 1699 err_out0: 1700 scsi_host_put(host); 1701 return ret; 1702 } 1703 1704 static int storvsc_remove(struct hv_device *dev) 1705 { 1706 struct storvsc_device *stor_device = hv_get_drvdata(dev); 1707 struct Scsi_Host *host = stor_device->host; 1708 1709 scsi_remove_host(host); 1710 storvsc_dev_remove(dev); 1711 scsi_host_put(host); 1712 1713 return 0; 1714 } 1715 1716 static struct hv_driver storvsc_drv = { 1717 .name = KBUILD_MODNAME, 1718 .id_table = id_table, 1719 .probe = storvsc_probe, 1720 .remove = storvsc_remove, 1721 }; 1722 1723 static int __init storvsc_drv_init(void) 1724 { 1725 u32 max_outstanding_req_per_channel; 1726 1727 /* 1728 * Divide the ring buffer data size (which is 1 page less 1729 * than the ring buffer size since that page is reserved for 1730 * the ring buffer indices) by the max request size (which is 1731 * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64) 1732 */ 1733 max_outstanding_req_per_channel = 1734 ((storvsc_ringbuffer_size - PAGE_SIZE) / 1735 ALIGN(MAX_MULTIPAGE_BUFFER_PACKET + 1736 sizeof(struct vstor_packet) + sizeof(u64) - 1737 vmscsi_size_delta, 1738 sizeof(u64))); 1739 1740 if (max_outstanding_req_per_channel < 1741 STORVSC_MAX_IO_REQUESTS) 1742 return -EINVAL; 1743 1744 return vmbus_driver_register(&storvsc_drv); 1745 } 1746 1747 static void __exit storvsc_drv_exit(void) 1748 { 1749 vmbus_driver_unregister(&storvsc_drv); 1750 } 1751 1752 MODULE_LICENSE("GPL"); 1753 MODULE_VERSION(HV_DRV_VERSION); 1754 MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver"); 1755 module_init(storvsc_drv_init); 1756 module_exit(storvsc_drv_exit); 1757