drivers/staging/hv/storvsc.c

   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  */
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/delay.h>
  26 #include "osd.h"
  27 #include "logging.h"
  28 #include "storvsc_api.h"
  29 #include "vmbus_packet_format.h"
  30 #include "vstorage.h"
  31
  32
  33 struct storvsc_request_extension {
  34         /* LIST_ENTRY ListEntry; */
  35
  36         struct hv_storvsc_request *Request;
  37         struct hv_device *Device;
  38
  39         /* Synchronize the request/response if needed */
  40         struct osd_waitevent *WaitEvent;
  41
  42         struct vstor_packet VStorPacket;
  43 };
  44
  45 /* A storvsc device is a device object that contains a vmbus channel */
  46 struct storvsc_device {
  47         struct hv_device *Device;
  48
  49         /* 0 indicates the device is being destroyed */
  50         atomic_t RefCount;
  51
  52         atomic_t NumOutstandingRequests;
  53
  54         /*
  55          * Each unique Port/Path/Target represents 1 channel ie scsi
  56          * controller. In reality, the pathid, targetid is always 0
  57          * and the port is set by us
  58          */
  59         unsigned int PortNumber;
  60         unsigned char PathId;
  61         unsigned char TargetId;
  62
  63         /* LIST_ENTRY OutstandingRequestList; */
  64         /* HANDLE OutstandingRequestLock; */
  65
  66         /* Used for vsc/vsp channel reset process */
  67         struct storvsc_request_extension InitRequest;
  68         struct storvsc_request_extension ResetRequest;
  69 };
  70
  71
  72 static const char *gDriverName = "storvsc";
  73
  74 /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
  75 static const struct hv_guid gStorVscDeviceType = {
  76         .data = {
  77                 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
  78                 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
  79         }
  80 };
  81
  82
  83 static inline struct storvsc_device *AllocStorDevice(struct hv_device *Device)
  84 {
  85         struct storvsc_device *storDevice;
  86
  87         storDevice = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
  88         if (!storDevice)
  89                 return NULL;
  90
  91         /* Set to 2 to allow both inbound and outbound traffics */
  92         /* (ie GetStorDevice() and MustGetStorDevice()) to proceed. */
  93         atomic_cmpxchg(&storDevice->RefCount, 0, 2);
  94
  95         storDevice->Device = Device;
  96         Device->Extension = storDevice;
  97
  98         return storDevice;
  99 }
 100
 101 static inline void FreeStorDevice(struct storvsc_device *Device)
 102 {
 103         /* ASSERT(atomic_read(&Device->RefCount) == 0); */
 104         kfree(Device);
 105 }
 106
 107 /* Get the stordevice object iff exists and its refcount > 1 */
 108 static inline struct storvsc_device *GetStorDevice(struct hv_device *Device)
 109 {
 110         struct storvsc_device *storDevice;
 111
 112         storDevice = (struct storvsc_device *)Device->Extension;
 113         if (storDevice && atomic_read(&storDevice->RefCount) > 1)
 114                 atomic_inc(&storDevice->RefCount);
 115         else
 116                 storDevice = NULL;
 117
 118         return storDevice;
 119 }
 120
 121 /* Get the stordevice object iff exists and its refcount > 0 */
 122 static inline struct storvsc_device *MustGetStorDevice(struct hv_device *Device)
 123 {
 124         struct storvsc_device *storDevice;
 125
 126         storDevice = (struct storvsc_device *)Device->Extension;
 127         if (storDevice && atomic_read(&storDevice->RefCount))
 128                 atomic_inc(&storDevice->RefCount);
 129         else
 130                 storDevice = NULL;
 131
 132         return storDevice;
 133 }
 134
 135 static inline void PutStorDevice(struct hv_device *Device)
 136 {
 137         struct storvsc_device *storDevice;
 138
 139         storDevice = (struct storvsc_device *)Device->Extension;
 140         /* ASSERT(storDevice); */
 141
 142         atomic_dec(&storDevice->RefCount);
 143         /* ASSERT(atomic_read(&storDevice->RefCount)); */
 144 }
 145
 146 /* Drop ref count to 1 to effectively disable GetStorDevice() */
 147 static inline struct storvsc_device *ReleaseStorDevice(struct hv_device *Device)
 148 {
 149         struct storvsc_device *storDevice;
 150
 151         storDevice = (struct storvsc_device *)Device->Extension;
 152         /* ASSERT(storDevice); */
 153
 154         /* Busy wait until the ref drop to 2, then set it to 1 */
 155         while (atomic_cmpxchg(&storDevice->RefCount, 2, 1) != 2)
 156                 udelay(100);
 157
 158         return storDevice;
 159 }
 160
 161 /* Drop ref count to 0. No one can use StorDevice object. */
 162 static inline struct storvsc_device *FinalReleaseStorDevice(
 163                         struct hv_device *Device)
 164 {
 165         struct storvsc_device *storDevice;
 166
 167         storDevice = (struct storvsc_device *)Device->Extension;
 168         /* ASSERT(storDevice); */
 169
 170         /* Busy wait until the ref drop to 1, then set it to 0 */
 171         while (atomic_cmpxchg(&storDevice->RefCount, 1, 0) != 1)
 172                 udelay(100);
 173
 174         Device->Extension = NULL;
 175         return storDevice;
 176 }
 177
 178 static int StorVscChannelInit(struct hv_device *Device)
 179 {
 180         struct storvsc_device *storDevice;
 181         struct storvsc_request_extension *request;
 182         struct vstor_packet *vstorPacket;
 183         int ret;
 184
 185         storDevice = GetStorDevice(Device);
 186         if (!storDevice) {
 187                 DPRINT_ERR(STORVSC, "unable to get stor device..."
 188                            "device being destroyed?");
 189                 DPRINT_EXIT(STORVSC);
 190                 return -1;
 191         }
 192
 193         request = &storDevice->InitRequest;
 194         vstorPacket = &request->VStorPacket;
 195
 196         /*
 197          * Now, initiate the vsc/vsp initialization protocol on the open
 198          * channel
 199          */
 200         memset(request, 0, sizeof(struct storvsc_request_extension));
 201         request->WaitEvent = osd_WaitEventCreate();
 202         if (!request->WaitEvent) {
 203                 ret = -ENOMEM;
 204                 goto nomem;
 205         }
 206
 207         vstorPacket->Operation = VStorOperationBeginInitialization;
 208         vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
 209
 210         /*SpinlockAcquire(gDriverExt.packetListLock);
 211         INSERT_TAIL_LIST(&gDriverExt.packetList, &packet->listEntry.entry);
 212         SpinlockRelease(gDriverExt.packetListLock);*/
 213
 214         DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION...");
 215
 216         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 217                                 vstorPacket,
 218                                 sizeof(struct vstor_packet),
 219                                 (unsigned long)request,
 220                                 VmbusPacketTypeDataInBand,
 221                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 222         if (ret != 0) {
 223                 DPRINT_ERR(STORVSC,
 224                            "unable to send BEGIN_INITIALIZATION_OPERATION");
 225                 goto Cleanup;
 226         }
 227
 228         osd_WaitEventWait(request->WaitEvent);
 229
 230         if (vstorPacket->Operation != VStorOperationCompleteIo ||
 231             vstorPacket->Status != 0) {
 232                 DPRINT_ERR(STORVSC, "BEGIN_INITIALIZATION_OPERATION failed "
 233                            "(op %d status 0x%x)",
 234                            vstorPacket->Operation, vstorPacket->Status);
 235                 goto Cleanup;
 236         }
 237
 238         DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION...");
 239
 240         /* reuse the packet for version range supported */
 241         memset(vstorPacket, 0, sizeof(struct vstor_packet));
 242         vstorPacket->Operation = VStorOperationQueryProtocolVersion;
 243         vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
 244
 245         vstorPacket->Version.MajorMinor = VMSTOR_PROTOCOL_VERSION_CURRENT;
 246         FILL_VMSTOR_REVISION(vstorPacket->Version.Revision);
 247
 248         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 249                                 vstorPacket,
 250                                 sizeof(struct vstor_packet),
 251                                 (unsigned long)request,
 252                                 VmbusPacketTypeDataInBand,
 253                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 254         if (ret != 0) {
 255                 DPRINT_ERR(STORVSC,
 256                            "unable to send BEGIN_INITIALIZATION_OPERATION");
 257                 goto Cleanup;
 258         }
 259
 260         osd_WaitEventWait(request->WaitEvent);
 261
 262         /* TODO: Check returned version */
 263         if (vstorPacket->Operation != VStorOperationCompleteIo ||
 264             vstorPacket->Status != 0) {
 265                 DPRINT_ERR(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION failed "
 266                            "(op %d status 0x%x)",
 267                            vstorPacket->Operation, vstorPacket->Status);
 268                 goto Cleanup;
 269         }
 270
 271         /* Query channel properties */
 272         DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION...");
 273
 274         memset(vstorPacket, 0, sizeof(struct vstor_packet));
 275         vstorPacket->Operation = VStorOperationQueryProperties;
 276         vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
 277         vstorPacket->StorageChannelProperties.PortNumber =
 278                                         storDevice->PortNumber;
 279
 280         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 281                                 vstorPacket,
 282                                 sizeof(struct vstor_packet),
 283                                 (unsigned long)request,
 284                                 VmbusPacketTypeDataInBand,
 285                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 286
 287         if (ret != 0) {
 288                 DPRINT_ERR(STORVSC,
 289                            "unable to send QUERY_PROPERTIES_OPERATION");
 290                 goto Cleanup;
 291         }
 292
 293         osd_WaitEventWait(request->WaitEvent);
 294
 295         /* TODO: Check returned version */
 296         if (vstorPacket->Operation != VStorOperationCompleteIo ||
 297             vstorPacket->Status != 0) {
 298                 DPRINT_ERR(STORVSC, "QUERY_PROPERTIES_OPERATION failed "
 299                            "(op %d status 0x%x)",
 300                            vstorPacket->Operation, vstorPacket->Status);
 301                 goto Cleanup;
 302         }
 303
 304         storDevice->PathId = vstorPacket->StorageChannelProperties.PathId;
 305         storDevice->TargetId = vstorPacket->StorageChannelProperties.TargetId;
 306
 307         DPRINT_DBG(STORVSC, "channel flag 0x%x, max xfer len 0x%x",
 308                    vstorPacket->StorageChannelProperties.Flags,
 309                    vstorPacket->StorageChannelProperties.MaxTransferBytes);
 310
 311         DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION...");
 312
 313         memset(vstorPacket, 0, sizeof(struct vstor_packet));
 314         vstorPacket->Operation = VStorOperationEndInitialization;
 315         vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
 316
 317         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 318                                 vstorPacket,
 319                                 sizeof(struct vstor_packet),
 320                                 (unsigned long)request,
 321                                 VmbusPacketTypeDataInBand,
 322                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 323
 324         if (ret != 0) {
 325                 DPRINT_ERR(STORVSC,
 326                            "unable to send END_INITIALIZATION_OPERATION");
 327                 goto Cleanup;
 328         }
 329
 330         osd_WaitEventWait(request->WaitEvent);
 331
 332         if (vstorPacket->Operation != VStorOperationCompleteIo ||
 333             vstorPacket->Status != 0) {
 334                 DPRINT_ERR(STORVSC, "END_INITIALIZATION_OPERATION failed "
 335                            "(op %d status 0x%x)",
 336                            vstorPacket->Operation, vstorPacket->Status);
 337                 goto Cleanup;
 338         }
 339
 340         DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****");
 341
 342 Cleanup:
 343         kfree(request->WaitEvent);
 344         request->WaitEvent = NULL;
 345 nomem:
 346         PutStorDevice(Device);
 347
 348         DPRINT_EXIT(STORVSC);
 349         return ret;
 350 }
 351
 352 static void StorVscOnIOCompletion(struct hv_device *Device,
 353                                   struct vstor_packet *VStorPacket,
 354                                   struct storvsc_request_extension *RequestExt)
 355 {
 356         struct hv_storvsc_request *request;
 357         struct storvsc_device *storDevice;
 358
 359         storDevice = MustGetStorDevice(Device);
 360         if (!storDevice) {
 361                 DPRINT_ERR(STORVSC, "unable to get stor device..."
 362                            "device being destroyed?");
 363                 DPRINT_EXIT(STORVSC);
 364                 return;
 365         }
 366
 367         DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION - request extension %p "
 368                    "completed bytes xfer %u", RequestExt,
 369                    VStorPacket->VmSrb.DataTransferLength);
 370
 371         /* ASSERT(RequestExt != NULL); */
 372         /* ASSERT(RequestExt->Request != NULL); */
 373
 374         request = RequestExt->Request;
 375
 376         /* ASSERT(request->OnIOCompletion != NULL); */
 377
 378         /* Copy over the status...etc */
 379         request->Status = VStorPacket->VmSrb.ScsiStatus;
 380
 381         if (request->Status != 0 || VStorPacket->VmSrb.SrbStatus != 1) {
 382                 DPRINT_WARN(STORVSC,
 383                             "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
 384                             request->Cdb[0], VStorPacket->VmSrb.ScsiStatus,
 385                             VStorPacket->VmSrb.SrbStatus);
 386         }
 387
 388         if ((request->Status & 0xFF) == 0x02) {
 389                 /* CHECK_CONDITION */
 390                 if (VStorPacket->VmSrb.SrbStatus & 0x80) {
 391                         /* autosense data available */
 392                         DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data "
 393                                     "valid - len %d\n", RequestExt,
 394                                     VStorPacket->VmSrb.SenseInfoLength);
 395
 396                         /* ASSERT(VStorPacket->VmSrb.SenseInfoLength <= */
 397                         /*      request->SenseBufferSize); */
 398                         memcpy(request->SenseBuffer,
 399                                VStorPacket->VmSrb.SenseData,
 400                                VStorPacket->VmSrb.SenseInfoLength);
 401
 402                         request->SenseBufferSize =
 403                                         VStorPacket->VmSrb.SenseInfoLength;
 404                 }
 405         }
 406
 407         /* TODO: */
 408         request->BytesXfer = VStorPacket->VmSrb.DataTransferLength;
 409
 410         request->OnIOCompletion(request);
 411
 412         atomic_dec(&storDevice->NumOutstandingRequests);
 413
 414         PutStorDevice(Device);
 415
 416         DPRINT_EXIT(STORVSC);
 417 }
 418
 419 static void StorVscOnReceive(struct hv_device *Device,
 420                              struct vstor_packet *VStorPacket,
 421                              struct storvsc_request_extension *RequestExt)
 422 {
 423         switch (VStorPacket->Operation) {
 424         case VStorOperationCompleteIo:
 425                 DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION");
 426                 StorVscOnIOCompletion(Device, VStorPacket, RequestExt);
 427                 break;
 428         case VStorOperationRemoveDevice:
 429                 DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION");
 430                 /* TODO: */
 431                 break;
 432
 433         default:
 434                 DPRINT_INFO(STORVSC, "Unknown operation received - %d",
 435                             VStorPacket->Operation);
 436                 break;
 437         }
 438 }
 439
 440 static void StorVscOnChannelCallback(void *context)
 441 {
 442         struct hv_device *device = (struct hv_device *)context;
 443         struct storvsc_device *storDevice;
 444         u32 bytesRecvd;
 445         u64 requestId;
 446         unsigned char packet[ALIGN_UP(sizeof(struct vstor_packet), 8)];
 447         struct storvsc_request_extension *request;
 448         int ret;
 449
 450         /* ASSERT(device); */
 451
 452         storDevice = MustGetStorDevice(device);
 453         if (!storDevice) {
 454                 DPRINT_ERR(STORVSC, "unable to get stor device..."
 455                            "device being destroyed?");
 456                 DPRINT_EXIT(STORVSC);
 457                 return;
 458         }
 459
 460         do {
 461                 ret = device->Driver->VmbusChannelInterface.RecvPacket(device,
 462                                 packet,
 463                                 ALIGN_UP(sizeof(struct vstor_packet), 8),
 464                                 &bytesRecvd, &requestId);
 465                 if (ret == 0 && bytesRecvd > 0) {
 466                         DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx",
 467                                    bytesRecvd, requestId);
 468
 469                         /* ASSERT(bytesRecvd == sizeof(struct vstor_packet)); */
 470
 471                         request = (struct storvsc_request_extension *)
 472                                         (unsigned long)requestId;
 473                         /* ASSERT(request);c */
 474
 475                         /* if (vstorPacket.Flags & SYNTHETIC_FLAG) */
 476                         if ((request == &storDevice->InitRequest) ||
 477                             (request == &storDevice->ResetRequest)) {
 478                                 /* DPRINT_INFO(STORVSC,
 479                                  *             "reset completion - operation "
 480                                  *             "%u status %u",
 481                                  *             vstorPacket.Operation,
 482                                  *             vstorPacket.Status); */
 483
 484                                 memcpy(&request->VStorPacket, packet,
 485                                        sizeof(struct vstor_packet));
 486
 487                                 osd_WaitEventSet(request->WaitEvent);
 488                         } else {
 489                                 StorVscOnReceive(device,
 490                                                 (struct vstor_packet *)packet,
 491                                                 request);
 492                         }
 493                 } else {
 494                         /* DPRINT_DBG(STORVSC, "nothing else to read..."); */
 495                         break;
 496                 }
 497         } while (1);
 498
 499         PutStorDevice(device);
 500
 501         DPRINT_EXIT(STORVSC);
 502         return;
 503 }
 504
 505 static int StorVscConnectToVsp(struct hv_device *Device)
 506 {
 507         struct vmstorage_channel_properties props;
 508         struct storvsc_driver_object *storDriver;
 509         int ret;
 510
 511         storDriver = (struct storvsc_driver_object *)Device->Driver;
 512         memset(&props, 0, sizeof(struct vmstorage_channel_properties));
 513
 514         /* Open the channel */
 515         ret = Device->Driver->VmbusChannelInterface.Open(Device,
 516                         storDriver->RingBufferSize,
 517                         storDriver->RingBufferSize,
 518                         (void *)&props,
 519                         sizeof(struct vmstorage_channel_properties),
 520                         StorVscOnChannelCallback,
 521                         Device);
 522
 523         DPRINT_DBG(STORVSC, "storage props: path id %d, tgt id %d, max xfer %d",
 524                    props.PathId, props.TargetId, props.MaxTransferBytes);
 525
 526         if (ret != 0) {
 527                 DPRINT_ERR(STORVSC, "unable to open channel: %d", ret);
 528                 return -1;
 529         }
 530
 531         ret = StorVscChannelInit(Device);
 532
 533         return ret;
 534 }
 535
 536 /*
 537  * StorVscOnDeviceAdd - Callback when the device belonging to this driver is added
 538  */
 539 static int StorVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo)
 540 {
 541         struct storvsc_device *storDevice;
 542         /* struct vmstorage_channel_properties *props; */
 543         struct storvsc_device_info *deviceInfo;
 544         int ret = 0;
 545
 546         deviceInfo = (struct storvsc_device_info *)AdditionalInfo;
 547         storDevice = AllocStorDevice(Device);
 548         if (!storDevice) {
 549                 ret = -1;
 550                 goto Cleanup;
 551         }
 552
 553         /* Save the channel properties to our storvsc channel */
 554         /* props = (struct vmstorage_channel_properties *)
 555          *              channel->offerMsg.Offer.u.Standard.UserDefined; */
 556
 557         /* FIXME: */
 558         /*
 559          * If we support more than 1 scsi channel, we need to set the
 560          * port number here to the scsi channel but how do we get the
 561          * scsi channel prior to the bus scan
 562          */
 563
 564         /* storChannel->PortNumber = 0;
 565         storChannel->PathId = props->PathId;
 566         storChannel->TargetId = props->TargetId; */
 567
 568         storDevice->PortNumber = deviceInfo->PortNumber;
 569         /* Send it back up */
 570         ret = StorVscConnectToVsp(Device);
 571
 572         /* deviceInfo->PortNumber = storDevice->PortNumber; */
 573         deviceInfo->PathId = storDevice->PathId;
 574         deviceInfo->TargetId = storDevice->TargetId;
 575
 576         DPRINT_DBG(STORVSC, "assigned port %u, path %u target %u\n",
 577                    storDevice->PortNumber, storDevice->PathId,
 578                    storDevice->TargetId);
 579
 580 Cleanup:
 581         DPRINT_EXIT(STORVSC);
 582
 583         return ret;
 584 }
 585
 586 /*
 587  * StorVscOnDeviceRemove - Callback when the our device is being removed
 588  */
 589 static int StorVscOnDeviceRemove(struct hv_device *Device)
 590 {
 591         struct storvsc_device *storDevice;
 592
 593         DPRINT_INFO(STORVSC, "disabling storage device (%p)...",
 594                     Device->Extension);
 595
 596         storDevice = ReleaseStorDevice(Device);
 597
 598         /*
 599          * At this point, all outbound traffic should be disable. We
 600          * only allow inbound traffic (responses) to proceed so that
 601          * outstanding requests can be completed.
 602          */
 603         while (atomic_read(&storDevice->NumOutstandingRequests)) {
 604                 DPRINT_INFO(STORVSC, "waiting for %d requests to complete...",
 605                             atomic_read(&storDevice->NumOutstandingRequests));
 606                 udelay(100);
 607         }
 608
 609         DPRINT_INFO(STORVSC, "removing storage device (%p)...",
 610                     Device->Extension);
 611
 612         storDevice = FinalReleaseStorDevice(Device);
 613
 614         DPRINT_INFO(STORVSC, "storage device (%p) safe to remove", storDevice);
 615
 616         /* Close the channel */
 617         Device->Driver->VmbusChannelInterface.Close(Device);
 618
 619         FreeStorDevice(storDevice);
 620
 621         DPRINT_EXIT(STORVSC);
 622         return 0;
 623 }
 624
 625 int StorVscOnHostReset(struct hv_device *Device)
 626 {
 627         struct storvsc_device *storDevice;
 628         struct storvsc_request_extension *request;
 629         struct vstor_packet *vstorPacket;
 630         int ret;
 631
 632         DPRINT_INFO(STORVSC, "resetting host adapter...");
 633
 634         storDevice = GetStorDevice(Device);
 635         if (!storDevice) {
 636                 DPRINT_ERR(STORVSC, "unable to get stor device..."
 637                            "device being destroyed?");
 638                 DPRINT_EXIT(STORVSC);
 639                 return -1;
 640         }
 641
 642         request = &storDevice->ResetRequest;
 643         vstorPacket = &request->VStorPacket;
 644
 645         request->WaitEvent = osd_WaitEventCreate();
 646         if (!request->WaitEvent) {
 647                 ret = -ENOMEM;
 648                 goto Cleanup;
 649         }
 650
 651         vstorPacket->Operation = VStorOperationResetBus;
 652         vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
 653         vstorPacket->VmSrb.PathId = storDevice->PathId;
 654
 655         ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 656                                 vstorPacket,
 657                                 sizeof(struct vstor_packet),
 658                                 (unsigned long)&storDevice->ResetRequest,
 659                                 VmbusPacketTypeDataInBand,
 660                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 661         if (ret != 0) {
 662                 DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d",
 663                            vstorPacket, ret);
 664                 goto Cleanup;
 665         }
 666
 667         /* FIXME: Add a timeout */
 668         osd_WaitEventWait(request->WaitEvent);
 669
 670         kfree(request->WaitEvent);
 671         DPRINT_INFO(STORVSC, "host adapter reset completed");
 672
 673         /*
 674          * At this point, all outstanding requests in the adapter
 675          * should have been flushed out and return to us
 676          */
 677
 678 Cleanup:
 679         PutStorDevice(Device);
 680         DPRINT_EXIT(STORVSC);
 681         return ret;
 682 }
 683
 684 /*
 685  * StorVscOnIORequest - Callback to initiate an I/O request
 686  */
 687 static int StorVscOnIORequest(struct hv_device *Device,
 688                               struct hv_storvsc_request *Request)
 689 {
 690         struct storvsc_device *storDevice;
 691         struct storvsc_request_extension *requestExtension;
 692         struct vstor_packet *vstorPacket;
 693         int ret = 0;
 694
 695         requestExtension =
 696                 (struct storvsc_request_extension *)Request->Extension;
 697         vstorPacket = &requestExtension->VStorPacket;
 698         storDevice = GetStorDevice(Device);
 699
 700         DPRINT_DBG(STORVSC, "enter - Device %p, DeviceExt %p, Request %p, "
 701                    "Extension %p", Device, storDevice, Request,
 702                    requestExtension);
 703
 704         DPRINT_DBG(STORVSC, "req %p len %d bus %d, target %d, lun %d cdblen %d",
 705                    Request, Request->DataBuffer.Length, Request->Bus,
 706                    Request->TargetId, Request->LunId, Request->CdbLen);
 707
 708         if (!storDevice) {
 709                 DPRINT_ERR(STORVSC, "unable to get stor device..."
 710                            "device being destroyed?");
 711                 DPRINT_EXIT(STORVSC);
 712                 return -2;
 713         }
 714
 715         /* print_hex_dump_bytes("", DUMP_PREFIX_NONE, Request->Cdb,
 716          *                      Request->CdbLen); */
 717
 718         requestExtension->Request = Request;
 719         requestExtension->Device  = Device;
 720
 721         memset(vstorPacket, 0 , sizeof(struct vstor_packet));
 722
 723         vstorPacket->Flags |= REQUEST_COMPLETION_FLAG;
 724
 725         vstorPacket->VmSrb.Length = sizeof(struct vmscsi_request);
 726
 727         vstorPacket->VmSrb.PortNumber = Request->Host;
 728         vstorPacket->VmSrb.PathId = Request->Bus;
 729         vstorPacket->VmSrb.TargetId = Request->TargetId;
 730         vstorPacket->VmSrb.Lun = Request->LunId;
 731
 732         vstorPacket->VmSrb.SenseInfoLength = SENSE_BUFFER_SIZE;
 733
 734         /* Copy over the scsi command descriptor block */
 735         vstorPacket->VmSrb.CdbLength = Request->CdbLen;
 736         memcpy(&vstorPacket->VmSrb.Cdb, Request->Cdb, Request->CdbLen);
 737
 738         vstorPacket->VmSrb.DataIn = Request->Type;
 739         vstorPacket->VmSrb.DataTransferLength = Request->DataBuffer.Length;
 740
 741         vstorPacket->Operation = VStorOperationExecuteSRB;
 742
 743         DPRINT_DBG(STORVSC, "srb - len %d port %d, path %d, target %d, "
 744                    "lun %d senselen %d cdblen %d",
 745                    vstorPacket->VmSrb.Length,
 746                    vstorPacket->VmSrb.PortNumber,
 747                    vstorPacket->VmSrb.PathId,
 748                    vstorPacket->VmSrb.TargetId,
 749                    vstorPacket->VmSrb.Lun,
 750                    vstorPacket->VmSrb.SenseInfoLength,
 751                    vstorPacket->VmSrb.CdbLength);
 752
 753         if (requestExtension->Request->DataBuffer.Length) {
 754                 ret = Device->Driver->VmbusChannelInterface.
 755                         SendPacketMultiPageBuffer(Device,
 756                                 &requestExtension->Request->DataBuffer,
 757                                 vstorPacket,
 758                                 sizeof(struct vstor_packet),
 759                                 (unsigned long)requestExtension);
 760         } else {
 761                 ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
 762                                 vstorPacket,
 763                                 sizeof(struct vstor_packet),
 764                                 (unsigned long)requestExtension,
 765                                 VmbusPacketTypeDataInBand,
 766                                 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 767         }
 768
 769         if (ret != 0) {
 770                 DPRINT_DBG(STORVSC, "Unable to send packet %p ret %d",
 771                            vstorPacket, ret);
 772         }
 773
 774         atomic_inc(&storDevice->NumOutstandingRequests);
 775
 776         PutStorDevice(Device);
 777
 778         DPRINT_EXIT(STORVSC);
 779         return ret;
 780 }
 781
 782 /*
 783  * StorVscOnCleanup - Perform any cleanup when the driver is removed
 784  */
 785 static void StorVscOnCleanup(struct hv_driver *Driver)
 786 {
 787         DPRINT_EXIT(STORVSC);
 788 }
 789
 790 /*
 791  * StorVscInitialize - Main entry point
 792  */
 793 int StorVscInitialize(struct hv_driver *Driver)
 794 {
 795         struct storvsc_driver_object *storDriver;
 796
 797         storDriver = (struct storvsc_driver_object *)Driver;
 798
 799         DPRINT_DBG(STORVSC, "sizeof(STORVSC_REQUEST)=%zd "
 800                    "sizeof(struct storvsc_request_extension)=%zd "
 801                    "sizeof(struct vstor_packet)=%zd, "
 802                    "sizeof(struct vmscsi_request)=%zd",
 803                    sizeof(struct hv_storvsc_request),
 804                    sizeof(struct storvsc_request_extension),
 805                    sizeof(struct vstor_packet),
 806                    sizeof(struct vmscsi_request));
 807
 808         /* Make sure we are at least 2 pages since 1 page is used for control */
 809         /* ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); */
 810
 811         Driver->name = gDriverName;
 812         memcpy(&Driver->deviceType, &gStorVscDeviceType,
 813                sizeof(struct hv_guid));
 814
 815         storDriver->RequestExtSize = sizeof(struct storvsc_request_extension);
 816
 817         /*
 818          * Divide the ring buffer data size (which is 1 page less
 819          * than the ring buffer size since that page is reserved for
 820          * the ring buffer indices) by the max request size (which is
 821          * VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + struct vstor_packet + u64)
 822          */
 823         storDriver->MaxOutstandingRequestsPerChannel =
 824                 ((storDriver->RingBufferSize - PAGE_SIZE) /
 825                   ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET +
 826                            sizeof(struct vstor_packet) + sizeof(u64),
 827                            sizeof(u64)));
 828
 829         DPRINT_INFO(STORVSC, "max io %u, currently %u\n",
 830                     storDriver->MaxOutstandingRequestsPerChannel,
 831                     STORVSC_MAX_IO_REQUESTS);
 832
 833         /* Setup the dispatch table */
 834         storDriver->Base.OnDeviceAdd    = StorVscOnDeviceAdd;
 835         storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove;
 836         storDriver->Base.OnCleanup      = StorVscOnCleanup;
 837
 838         storDriver->OnIORequest         = StorVscOnIORequest;
 839
 840         DPRINT_EXIT(STORVSC);
 841
 842         return 0;
 843 }