diff options
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/hv/StorVsc.c | 967 | ||||
| -rw-r--r-- | drivers/staging/hv/storvsc_drv.c | 1413 |
2 files changed, 2380 insertions, 0 deletions
diff --git a/drivers/staging/hv/StorVsc.c b/drivers/staging/hv/StorVsc.c new file mode 100644 index 00000000000..8a1d7766754 --- /dev/null +++ b/drivers/staging/hv/StorVsc.c @@ -0,0 +1,967 @@ +/* + * + * Copyright (c) 2009, Microsoft Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Haiyang Zhang <haiyangz@microsoft.com> + * Hank Janssen <hjanssen@microsoft.com> + * + */ + + +#include "logging.h" + +#include "StorVscApi.h" +#include "VmbusPacketFormat.h" +#include "vstorage.h" + + +// +// #defines +// + +// +// Data types +// + +typedef struct _STORVSC_REQUEST_EXTENSION { + //LIST_ENTRY ListEntry; + + STORVSC_REQUEST *Request; + DEVICE_OBJECT *Device; + + // Synchronize the request/response if needed + HANDLE WaitEvent; + + VSTOR_PACKET VStorPacket; +} STORVSC_REQUEST_EXTENSION; + + +// A storvsc device is a device object that contains a vmbus channel +typedef struct _STORVSC_DEVICE{ + DEVICE_OBJECT *Device; + + int RefCount; // 0 indicates the device is being destroyed + + int NumOutstandingRequests; + + // Each unique Port/Path/Target represents 1 channel ie scsi controller. In reality, the pathid, targetid is always 0 + // and the port is set by us + ULONG PortNumber; + UCHAR PathId; + UCHAR TargetId; + + //LIST_ENTRY OutstandingRequestList; + //HANDLE OutstandingRequestLock; + + // Used for vsc/vsp channel reset process + STORVSC_REQUEST_EXTENSION InitRequest; + + STORVSC_REQUEST_EXTENSION ResetRequest; + +} STORVSC_DEVICE; + + +// +// Globals +// +static const char* gDriverName="storvsc"; + +//{ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} +static const GUID gStorVscDeviceType={ + .Data = {0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f} +}; + +// +// Internal routines +// +static int +StorVscOnDeviceAdd( + DEVICE_OBJECT *Device, + void *AdditionalInfo + ); + +static int +StorVscOnDeviceRemove( + DEVICE_OBJECT *Device + ); + +static int +StorVscOnIORequest( + DEVICE_OBJECT *Device, + STORVSC_REQUEST *Request + ); + +static int +StorVscOnHostReset( + DEVICE_OBJECT *Device + ); + +static void +StorVscOnCleanup( + DRIVER_OBJECT *Device + ); + +static void +StorVscOnChannelCallback( + PVOID Context + ); + +static void +StorVscOnIOCompletion( + DEVICE_OBJECT *Device, + VSTOR_PACKET *VStorPacket, + STORVSC_REQUEST_EXTENSION *RequestExt + ); + +static void +StorVscOnReceive( + DEVICE_OBJECT *Device, + VSTOR_PACKET *VStorPacket, + STORVSC_REQUEST_EXTENSION *RequestExt + ); + +static int +StorVscConnectToVsp( + DEVICE_OBJECT *Device + ); + +static inline STORVSC_DEVICE* AllocStorDevice(DEVICE_OBJECT *Device) +{ + STORVSC_DEVICE *storDevice; + + storDevice = MemAllocZeroed(sizeof(STORVSC_DEVICE)); + if (!storDevice) + return NULL; + + // Set to 2 to allow both inbound and outbound traffics + // (ie GetStorDevice() and MustGetStorDevice()) to proceed. + InterlockedCompareExchange(&storDevice->RefCount, 2, 0); + + storDevice->Device = Device; + Device->Extension = storDevice; + + return storDevice; +} + +static inline void FreeStorDevice(STORVSC_DEVICE *Device) +{ + ASSERT(Device->RefCount == 0); + MemFree(Device); +} + +// Get the stordevice object iff exists and its refcount > 1 +static inline STORVSC_DEVICE* GetStorDevice(DEVICE_OBJECT *Device) +{ + STORVSC_DEVICE *storDevice; + + storDevice = (STORVSC_DEVICE*)Device->Extension; + if (storDevice && storDevice->RefCount > 1) + { + InterlockedIncrement(&storDevice->RefCount); + } + else + { + storDevice = NULL; + } + + return storDevice; +} + +// Get the stordevice object iff exists and its refcount > 0 +static inline STORVSC_DEVICE* MustGetStorDevice(DEVICE_OBJECT *Device) +{ + STORVSC_DEVICE *storDevice; + + storDevice = (STORVSC_DEVICE*)Device->Extension; + if (storDevice && storDevice->RefCount) + { + InterlockedIncrement(&storDevice->RefCount); + } + else + { + storDevice = NULL; + } + + return storDevice; +} + +static inline void PutStorDevice(DEVICE_OBJECT *Device) +{ + STORVSC_DEVICE *storDevice; + + storDevice = (STORVSC_DEVICE*)Device->Extension; + ASSERT(storDevice); + + InterlockedDecrement(&storDevice->RefCount); + ASSERT(storDevice->RefCount); +} + +// Drop ref count to 1 to effectively disable GetStorDevice() +static inline STORVSC_DEVICE* ReleaseStorDevice(DEVICE_OBJECT *Device) +{ + STORVSC_DEVICE *storDevice; + + storDevice = (STORVSC_DEVICE*)Device->Extension; + ASSERT(storDevice); + + // Busy wait until the ref drop to 2, then set it to 1 + while (InterlockedCompareExchange(&storDevice->RefCount, 1, 2) != 2) + { + Sleep(100); + } + + return storDevice; +} + +// Drop ref count to 0. No one can use StorDevice object. +static inline STORVSC_DEVICE* FinalReleaseStorDevice(DEVICE_OBJECT *Device) +{ + STORVSC_DEVICE *storDevice; + + storDevice = (STORVSC_DEVICE*)Device->Extension; + ASSERT(storDevice); + + // Busy wait until the ref drop to 1, then set it to 0 + while (InterlockedCompareExchange(&storDevice->RefCount, 0, 1) != 1) + { + Sleep(100); + } + + Device->Extension = NULL; + return storDevice; +} + +/*++; + + +Name: + StorVscInitialize() + +Description: + Main entry point + +--*/ +int +StorVscInitialize( + DRIVER_OBJECT *Driver + ) +{ + STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver; + int ret=0; + + DPRINT_ENTER(STORVSC); + + DPRINT_DBG(STORVSC, "sizeof(STORVSC_REQUEST)=%d sizeof(STORVSC_REQUEST_EXTENSION)=%d sizeof(VSTOR_PACKET)=%d, sizeof(VMSCSI_REQUEST)=%d", + sizeof(STORVSC_REQUEST), sizeof(STORVSC_REQUEST_EXTENSION), sizeof(VSTOR_PACKET), sizeof(VMSCSI_REQUEST)); + + // Make sure we are at least 2 pages since 1 page is used for control + ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); + + Driver->name = gDriverName; + memcpy(&Driver->deviceType, &gStorVscDeviceType, sizeof(GUID)); + + storDriver->RequestExtSize = sizeof(STORVSC_REQUEST_EXTENSION); + + // Divide the ring buffer data size (which is 1 page less than the ring buffer size since that page is reserved for the ring buffer indices) + // by the max request size (which is VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + VSTOR_PACKET + UINT64) + storDriver->MaxOutstandingRequestsPerChannel = + ((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(UINT64),sizeof(UINT64))); + + DPRINT_INFO(STORVSC, "max io %u, currently %u\n", storDriver->MaxOutstandingRequestsPerChannel, STORVSC_MAX_IO_REQUESTS); + + // Setup the dispatch table + storDriver->Base.OnDeviceAdd = StorVscOnDeviceAdd; + storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove; + storDriver->Base.OnCleanup = StorVscOnCleanup; + + storDriver->OnIORequest = StorVscOnIORequest; + storDriver->OnHostReset = StorVscOnHostReset; + + DPRINT_EXIT(STORVSC); + + return ret; +} + +/*++ + +Name: + StorVscOnDeviceAdd() + +Description: + Callback when the device belonging to this driver is added + +--*/ +int +StorVscOnDeviceAdd( + DEVICE_OBJECT *Device, + void *AdditionalInfo + ) +{ + int ret=0; + STORVSC_DEVICE *storDevice; + //VMSTORAGE_CHANNEL_PROPERTIES *props; + STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo; + + DPRINT_ENTER(STORVSC); + + storDevice = AllocStorDevice(Device); + if (!storDevice) + { + ret = -1; + goto Cleanup; + } + + // Save the channel properties to our storvsc channel + //props = (VMSTORAGE_CHANNEL_PROPERTIES*) channel->offerMsg.Offer.u.Standard.UserDefined; + + // FIXME: + // If we support more than 1 scsi channel, we need to set the port number here + // to the scsi channel but how do we get the scsi channel prior to the bus scan + /*storChannel->PortNumber = 0; + storChannel->PathId = props->PathId; + storChannel->TargetId = props->TargetId;*/ + + storDevice->PortNumber = deviceInfo->PortNumber; + // Send it back up + ret = StorVscConnectToVsp(Device); + + //deviceInfo->PortNumber = storDevice->PortNumber; + deviceInfo->PathId = storDevice->PathId; + deviceInfo->TargetId = storDevice->TargetId; + + DPRINT_DBG(STORVSC, "assigned port %u, path %u target %u\n", storDevice->PortNumber, storDevice->PathId, storDevice->TargetId); + +Cleanup: + DPRINT_EXIT(STORVSC); + + return ret; +} + +static int StorVscChannelInit(DEVICE_OBJECT *Device) +{ + int ret=0; + STORVSC_DEVICE *storDevice; + STORVSC_REQUEST_EXTENSION *request; + VSTOR_PACKET *vstorPacket; + + storDevice = GetStorDevice(Device); + if (!storDevice) + { + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?"); + DPRINT_EXIT(STORVSC); + return -1; + } + + request = &storDevice->InitRequest; + vstorPacket = &request->VStorPacket; + + // Now, initiate the vsc/vsp initialization protocol on the open channel + + memset(request, sizeof(STORVSC_REQUEST_EXTENSION), 0); + request->WaitEvent = WaitEventCreate(); + + vstorPacket->Operation = VStorOperationBeginInitialization; + vstorPacket->Flags = REQUEST_COMPLETION_FLAG; + + /*SpinlockAcquire(gDriverExt.packetListLock); + INSERT_TAIL_LIST(&gDriverExt.packetList, &packet->listEntry.entry); + SpinlockRelease(gDriverExt.packetListLock);*/ + + DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION..."); + + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device, + vstorPacket, + sizeof(VSTOR_PACKET), + (ULONG_PTR)request, + VmbusPacketTypeDataInBand, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + if ( ret != 0) + { + DPRINT_ERR(STORVSC, "unable to send BEGIN_INITIALIZATION_OPERATION"); + goto Cleanup; + } + + WaitEventWait(request->WaitEvent); + + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0) + { + DPRINT_ERR(STORVSC, "BEGIN_INITIALIZATION_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status); + goto Cleanup; + } + + DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION..."); + + // reuse the packet for version range supported + memset(vstorPacket, sizeof(VSTOR_PACKET), 0); + vstorPacket->Operation = VStorOperationQueryProtocolVersion; + vstorPacket->Flags = REQUEST_COMPLETION_FLAG; + + vstorPacket->Version.MajorMinor = VMSTOR_PROTOCOL_VERSION_CURRENT; + FILL_VMSTOR_REVISION(vstorPacket->Version.Revision); + + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device, + vstorPacket, + sizeof(VSTOR_PACKET), + (ULONG_PTR)request, + VmbusPacketTypeDataInBand, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + if ( ret != 0) + { + DPRINT_ERR(STORVSC, "unable to send BEGIN_INITIALIZATION_OPERATION"); + goto Cleanup; + } + + WaitEventWait(request->WaitEvent); + + // TODO: Check returned version + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0) + { + DPRINT_ERR(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status); + goto Cleanup; + } + + // Query channel properties + DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION..."); + + memset(vstorPacket, sizeof(VSTOR_PACKET), 0); + vstorPacket->Operation = VStorOperationQueryProperties; + vstorPacket->Flags = REQUEST_COMPLETION_FLAG; + vstorPacket->StorageChannelProperties.PortNumber = storDevice->PortNumber; + + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device, + vstorPacket, + sizeof(VSTOR_PACKET), + (ULONG_PTR)request, + VmbusPacketTypeDataInBand, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + + if ( ret != 0) + { + DPRINT_ERR(STORVSC, "unable to send QUERY_PROPERTIES_OPERATION"); + goto Cleanup; + } + + WaitEventWait(request->WaitEvent); + + // TODO: Check returned version + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0) + { + DPRINT_ERR(STORVSC, "QUERY_PROPERTIES_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status); + goto Cleanup; + } + + //storDevice->PortNumber = vstorPacket->StorageChannelProperties.PortNumber; + storDevice->PathId = vstorPacket->StorageChannelProperties.PathId; + storDevice->TargetId = vstorPacket->StorageChannelProperties.TargetId; + + DPRINT_DBG(STORVSC, "channel flag 0x%x, max xfer len 0x%x", vstorPacket->StorageChannelProperties.Flags, vstorPacket->StorageChannelProperties.MaxTransferBytes); + + DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION..."); + + memset(vstorPacket, sizeof(VSTOR_PACKET), 0); + vstorPacket->Operation = VStorOperationEndInitialization; + vstorPacket->Flags = REQUEST_COMPLETION_FLAG; + + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device, + vstorPacket, + sizeof(VSTOR_PACKET), + (ULONG_PTR)request, + VmbusPacketTypeDataInBand, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + + if ( ret != 0) + { + DPRINT_ERR(STORVSC, "unable to send END_INITIALIZATION_OPERATION"); + goto Cleanup; + } + + WaitEventWait(request->WaitEvent); + + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0) + { + DPRINT_ERR(STORVSC, "END_INITIALIZATION_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status); + goto Cleanup; + } + + DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****"); + +Cleanup: + if (request->WaitEvent) + { + WaitEventClose(request->WaitEvent); + request->WaitEvent = NULL; + } + + PutStorDevice(Device); + + DPRINT_EXIT(STORVSC); + return ret; +} + + +int +StorVscConnectToVsp( + DEVICE_OBJECT *Device + ) +{ + int ret=0; + VMSTORAGE_CHANNEL_PROPERTIES props; + + STORVSC_DRIVER_OBJECT *storDriver = (STORVSC_DRIVER_OBJECT*) Device->Driver;; + + memset(&props, sizeof(VMSTORAGE_CHANNEL_PROPERTIES), 0); + + // Open the channel + ret = Device->Driver->VmbusChannelInterface.Open(Device, + storDriver->RingBufferSize, + storDriver->RingBufferSize, + (PVOID)&props, + sizeof(VMSTORAGE_CHANNEL_PROPERTIES), + StorVscOnChannelCallback, + Device + ); + + DPRINT_DBG(STORVSC, "storage props: path id %d, tgt id %d, max xfer %d", props.PathId, props.TargetId, props.MaxTransferBytes); + + if (ret != 0) + { + DPRINT_ERR(STORVSC, "unable to open channel: %d", ret); + return -1; + } + + ret = StorVscChannelInit(Device); + + return ret; +} + + +/*++ + +Name: + StorVscOnDeviceRemove() + +Description: + Callback when the our device is being removed + +--*/ +int +StorVscOnDeviceRemove( + DEVICE_OBJECT *Device + ) +{ + STORVSC_DEVICE *storDevice; + int ret=0; + + DPRINT_ENTER(STORVSC); + + DPRINT_INFO(STORVSC, "disabling storage device (%p)...", Device->Extension); + + storDevice = ReleaseStorDevice(Device); + + // At this point, all outbound traffic should be disable. We only allow inbound traffic (responses) to proceed + // so that outstanding requests can be completed. + while (storDevice->NumOutstandingRequests) + { + DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", storDevice->NumOutstandingRequests); + + Sleep(100); + } + + DPRINT_INFO(STORVSC, "removing storage device (%p)...", Device->Extension); + + storDevice = FinalReleaseStorDevice(Device); + + DPRINT_INFO(STORVSC, "storage device (%p) safe to remove", storDevice); + + // Close the channel + Device->Driver->VmbusChannelInterface.Close(Device); + + FreeStorDevice(storDevice); + + DPRINT_EXIT(STORVSC); + return ret; +} + + +//static void +//StorVscOnTargetRescan( +// void *Context +// ) +//{ +// DEVICE_OBJECT *device=(DEVICE_OBJECT*)Context; +// STORVSC_DRIVER_OBJECT *storDriver; +// +// DPRINT_ENTER(STORVSC); +// +// storDriver = (STORVSC_DRIVER_OBJECT*) device->Driver; +// storDriver->OnHostRescan(device); +// +// DPRINT_EXIT(STORVSC); +//} + +int +StorVscOnHostReset( + DEVICE_OBJECT *Device + ) +{ + int ret=0; + + STORVSC_DEVICE *storDevice; + STORVSC_REQUEST_EXTENSION *request; + VSTOR_PACKET *vstorPacket; + + DPRINT_ENTER(STORVSC); + + DPRINT_INFO(STORVSC, "resetting host adapter..."); + + storDevice = GetStorDevice(Device); + if (!storDevice) + { + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?"); + DPRINT_EXIT(STORVSC); + return -1; + } + + request = &storDevice->ResetRequest; + vstorPacket = &request->VStorPacket; + + request->WaitEvent = WaitEventCreate(); + + vstorPacket->Operation = VStorOperationResetBus; + vstorPacket->Flags = REQUEST_COMPLETION_FLAG; + vstorPacket->VmSrb.PathId = storDevice->PathId; + + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device, + vstorPacket, + sizeof(VSTOR_PACKET), + (ULONG_PTR)&storDevice->ResetRequest, + VmbusPacketTypeDataInBand, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + if (ret != 0) + { + DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d", vstorPacket, ret); + goto Cleanup; + } + + // FIXME: Add a timeout + WaitEventWait(request->WaitEvent); + + WaitEventClose(request->WaitEvent); + DPRINT_INFO(STORVSC, "host adapter reset completed"); + + // At this point, all outstanding requests in the adapter should have been flushed out and return to us + +Cleanup: + PutStorDevice(Device); + DPRINT_EXIT(STORVSC); + return ret; +} + +/*++ + +Name: + StorVscOnIORequest() + +Description: + Callback to initiate an I/O request + +--*/ +int +StorVscOnIORequest( + DEVICE_OBJECT *Device, + STORVSC_REQUEST *Request + ) +{ + STORVSC_DEVICE *storDevice; + STORVSC_REQUEST_EXTENSION* requestExtension = (STORVSC_REQUEST_EXTENSION*) Request->Extension; + VSTOR_PACKET* vstorPacket =&requestExtension->VStorPacket; + int ret=0; + + DPRINT_ENTER(STORVSC); + + storDevice = GetStorDevice(Device); + + DPRINT_DBG(STORVSC, "enter - Device %p, DeviceExt %p, Request %p, Extension %p", + Device, storDevice, Request, requestExtension); + + DPRINT_DBG(STORVSC, "req %p len %d bus %d, target %d, lun %d cdblen %d", + Request, Request->DataBuffer.Length, Request->Bus, Request->TargetId, Request->LunId, Request->CdbLen); + + if (!storDevice) + { + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?"); + DPRINT_EXIT(STORVSC); + return -2; + } + + //PrintBytes(Request->Cdb, Request->CdbLen); + + requestExtension->Request = Request; + requestExtension->Device = Device; + + memset(vstorPacket, 0 , sizeof(VSTOR_PACKET)); + + vstorPacket->Flags |= REQUEST_COMPLETION_FLAG; + + vstorPacket->VmSrb.Length = sizeof(VMSCSI_REQUEST); + + vstorPacket->VmSrb.PortNumber = Request->Host; + vstorPacket->VmSrb.PathId = Request->Bus; + vstorPacket->VmSrb.TargetId = Request->TargetId; + vstorPacket->VmSrb.Lun = Request->LunId; + + vstorPacket->VmSrb.SenseInfoLength = SENSE_BUFFER_SIZE; + + // Copy over the scsi command descriptor block + vstorPacket->VmSrb.CdbLength = Request->CdbLen; + memcpy(&vstorPacket->VmSrb.Cdb, Request->Cdb, Request->CdbLen); + + vstorPacket->VmSrb.DataIn = Request->Type; + vstorPacket->VmSrb.DataTransferLength = Request->DataBuffer.Length; + + vstorPacket->Operation = VStorOperationExecuteSRB; + + DPRINT_DBG(STORVSC, "srb - len %d port %d, path %d, target %d, lun %d senselen %d cdblen %d", + vstorPacket->VmSrb.Length, + vstorPacket->VmSrb.PortNumber, + vstorPacket->VmSrb.PathId, + vstorPacket->VmSrb.TargetId, + vstorPacket->VmSrb.Lun, + vstorPacket->VmSrb.SenseInfoLength, + vstorPacket->VmSrb.CdbLength); + + if (requestExtension->Request->DataBuffer.Length) + { + ret = Device->Driver->VmbusChannelInterface.SendPacketMultiPageBuffer(Device, + &requestExtension->Request->DataBuffer, + vstorPacket, + sizeof(VSTOR_PACKET), + (ULONG_PTR)requestExtension); + } + else + { + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device, + vstorPacket, + sizeof(VSTOR_PACKET), + (ULONG_PTR)requestExtension, + VmbusPacketTypeDataInBand, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + } + + if (ret != 0) + { + DPRINT_DBG(STORVSC, "Unable to send packet %p ret %d", vstorPacket, ret); + } + + InterlockedIncrement(&storDevice->NumOutstandingRequests); + + PutStorDevice(Device); + + DPRINT_EXIT(STORVSC); + return ret; +} + +/*++ + +Name: + StorVscOnCleanup() + +Description: + Perform any cleanup when the driver is removed + +--*/ +void +StorVscOnCleanup( + DRIVER_OBJECT *Driver + ) +{ + DPRINT_ENTER(STORVSC); + DPRINT_EXIT(STORVSC); +} + + +static void +StorVscOnIOCompletion( + DEVICE_OBJECT *Device, + VSTOR_PACKET *VStorPacket, + STORVSC_REQUEST_EXTENSION *RequestExt + ) +{ + STORVSC_REQUEST *request; + STORVSC_DEVICE *storDevice; + + DPRINT_ENTER(STORVSC); + + storDevice = MustGetStorDevice(Device); + if (!storDevice) + { + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?"); + DPRINT_EXIT(STORVSC); + return; + } + + DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION - request extension %p completed bytes xfer %u", + RequestExt, VStorPacket->VmSrb.DataTransferLength); + + ASSERT(RequestExt != NULL); + ASSERT(RequestExt->Request != NULL); + + request = RequestExt->Request; + + ASSERT(request->OnIOCompletion != NULL); + + // Copy over the status...etc + request->Status = VStorPacket->VmSrb.ScsiStatus; + + if (request->Status != 0 || VStorPacket->VmSrb.SrbStatus != 1) + { + DPRINT_WARN(STORVSC, "cmd 0x%x scsi status 0x%x srb status 0x%x\n", + request->Cdb[0], + VStorPacket->VmSrb.ScsiStatus, + VStorPacket->VmSrb.SrbStatus); + } + + if ((request->Status & 0xFF) == 0x02) // CHECK_CONDITION + { + if (VStorPacket->VmSrb.SrbStatus & 0x80) // autosense data available + { + DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data valid - len %d\n", + RequestExt, VStorPacket->VmSrb.SenseInfoLength); + + ASSERT(VStorPacket->VmSrb.SenseInfoLength <= request->SenseBufferSize); + memcpy(request->SenseBuffer, + VStorPacket->VmSrb.SenseData, + VStorPacket->VmSrb.SenseInfoLength); + + request->SenseBufferSize = VStorPacket->VmSrb.SenseInfoLength; + } + } + + // TODO: + request->BytesXfer = VStorPacket->VmSrb.DataTransferLength; + + request->OnIOCompletion(request); + + InterlockedDecrement(&storDevice->NumOutstandingRequests); + + PutStorDevice(Device); + + DPRINT_EXIT(STORVSC); +} + + +static void +StorVscOnReceive( + DEVICE_OBJECT *Device, + VSTOR_PACKET *VStorPacket, + STORVSC_REQUEST_EXTENSION *RequestExt + ) +{ + switch(VStorPacket->Operation) + { + case VStorOperationCompleteIo: + + DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION"); + StorVscOnIOCompletion(Device, VStorPacket, RequestExt); + break; + + //case ENUMERATE_DEVICE_OPERATION: + + // DPRINT_INFO(STORVSC, "ENUMERATE_DEVICE_OPERATION"); + + // StorVscOnTargetRescan(Device); + // break; + + case VStorOperationRemoveDevice: + + DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION"); + // TODO: + break; + + default: + DPRINT_INFO(STORVSC, "Unknown operation received - %d", VStorPacket->Operation); + break; + } +} + +void +StorVscOnChannelCallback( + PVOID Context + ) +{ + int ret=0; + DEVICE_OBJECT *device = (DEVICE_OBJECT*)Context; + STORVSC_DEVICE *storDevice; + UINT32 bytesRecvd; + UINT64 requestId; + UCHAR packet[ALIGN_UP(sizeof(VSTOR_PACKET),8)]; + STORVSC_REQUEST_EXTENSION *request; + + DPRINT_ENTER(STORVSC); + + ASSERT(device); + + storDevice = MustGetStorDevice(device); + if (!storDevice) + { + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?"); + DPRINT_EXIT(STORVSC); + return; + } + + do + { + ret = device->Driver->VmbusChannelInterface.RecvPacket(device, + packet, + ALIGN_UP(sizeof(VSTOR_PACKET),8), + &bytesRecvd, + &requestId); + if (ret == 0 && bytesRecvd > 0) + { + DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx", bytesRecvd, requestId); + + //ASSERT(bytesRecvd == sizeof(VSTOR_PACKET)); + + request = (STORVSC_REQUEST_EXTENSION*)(ULONG_PTR)requestId; + ASSERT(request); + + //if (vstorPacket.Flags & SYNTHETIC_FLAG) + if ((request == &storDevice->InitRequest) || (request == &storDevice->ResetRequest)) + { + //DPRINT_INFO(STORVSC, "reset completion - operation %u status %u", vstorPacket.Operation, vstorPacket.Status); + + memcpy(&request->VStorPacket, packet, sizeof(VSTOR_PACKET)); + + WaitEventSet(request->WaitEvent); + } + else + { + StorVscOnReceive(device, (VSTOR_PACKET*)packet, request); + } + } + else + { + //DPRINT_DBG(STORVSC, "nothing else to read..."); + break; + } + } while (1); + + PutStorDevice(device); + + DPRINT_EXIT(STORVSC); + return; +} diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c new file mode 100644 index 00000000000..d5a337bb99a --- /dev/null +++ b/drivers/staging/hv/storvsc_drv.c @@ -0,0 +1,1413 @@ +/* + * + * Copyright (c) 2009, Microsoft Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Haiyang Zhang <haiyangz@microsoft.com> + * Hank Janssen <hjanssen@microsoft.com> + * + */ + + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/blkdev.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_devinfo.h> + +#ifdef KERNEL_2_6_5 +#else +#include <scsi/scsi_dbg.h> +#endif + +#include "logging.h" +#include "vmbus.h" + +#include "StorVscApi.h" + +// +// #defines +// + +// +// Data types +// +struct host_device_context { + struct work_struct host_rescan_work; //must be 1st field + struct device_context *device_ctx; // point back to our device context +#ifdef KERNEL_2_6_27 + struct kmem_cache *request_pool; +#else + kmem_cache_t *request_pool; +#endif + unsigned int port; + unsigned char path; + unsigned char target; +}; + +struct storvsc_cmd_request { + struct list_head entry; + struct scsi_cmnd *cmd; + + unsigned int bounce_sgl_count; + struct scatterlist *bounce_sgl; + + STORVSC_REQUEST request; + // !!!DO NOT ADD ANYTHING BELOW HERE!!! + // The extension buffer falls right here and is pointed to by request.Extension; +}; + +struct storvsc_driver_context { + // !! These must be the first 2 fields !! + struct driver_context drv_ctx; + STORVSC_DRIVER_OBJECT drv_obj; +}; + +// Static decl +static int storvsc_probe(struct device *dev); +static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)); +static int storvsc_device_alloc(struct scsi_device *); +static int storvsc_device_configure(struct scsi_device *); +static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd); +#ifdef KERNEL_2_6_27 +static void storvsc_host_rescan_callback(struct work_struct *work); +#else +static void storvsc_host_rescan_callback(void* context); +#endif +static void storvsc_host_rescan(DEVICE_OBJECT* device_obj); +static int storvsc_remove(struct device *dev); + +static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len); +static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); +static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count); +static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); +static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count); + +static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count); +static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info); + + +static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE; + +// The one and only one +static struct storvsc_driver_context g_storvsc_drv; + +// Scsi driver +static struct scsi_host_template scsi_driver = { + .module = THIS_MODULE, + .name = "storvsc_host_t", + .bios_param = storvsc_get_chs, + .queuecommand = storvsc_queuecommand, + .eh_host_reset_handler = storvsc_host_reset_handler, + .slave_alloc = storvsc_device_alloc, + .slave_configure = storvsc_device_configure, + .cmd_per_lun = 1, + .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, // 64 max_queue * 1 target + .this_id = -1, + // no use setting to 0 since ll_blk_rw reset it to 1 + .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,// currently 32 + // ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge into 1 sg element. If set, we must + // limit the max_segment_size to PAGE_SIZE, otherwise we may get 1 sg element that represents multiple + // physically contig pfns (ie sg[x].length > PAGE_SIZE). + .use_clustering = ENABLE_CLUSTERING, + // Make sure we dont get a sg segment crosses a page boundary + .dma_boundary = PAGE_SIZE-1, +}; + + +/*++ + +Name: storvsc_drv_init() + +Desc: StorVsc driver initialization. + +--*/ +int storvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init) +{ + int ret=0; + STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj; + struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; + + DPRINT_ENTER(STORVSC_DRV); + + vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface); + + storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size; + storvsc_drv_obj->OnHostRescan = storvsc_host_rescan; + + // Callback to client driver to complete the initialization + pfn_drv_init(&storvsc_drv_obj->Base); + + DPRINT_INFO(STORVSC_DRV, "request extension size %u, max outstanding reqs %u", storvsc_drv_obj->RequestExtSize, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); + + if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < STORVSC_MAX_IO_REQUESTS) + { + DPRINT_ERR(STORVSC_DRV, "The number of outstanding io requests (%d) is larger than that supported (%d) internally.", + STORVSC_MAX_IO_REQUESTS, storvsc_drv_obj->MaxOutstandingRequestsPerChannel); + return -1; + } + + drv_ctx->driver.name = storvsc_drv_obj->Base.name; + memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(GUID)); + +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) + drv_ctx->driver.probe = storvsc_probe; + drv_ctx->driver.remove = storvsc_remove; +#else + drv_ctx->probe = storvsc_probe; + drv_ctx->remove = storvsc_remove; +#endif + + // The driver belongs to vmbus + vmbus_child_driver_register(drv_ctx); + + DPRINT_EXIT(STORVSC_DRV); + + return ret; +} + + +static int storvsc_drv_exit_cb(struct device *dev, void *data) +{ + struct device **curr = (struct device **)data; + *curr = dev; + return 1; // stop iterating +} + +/*++ + +Name: storvsc_drv_exit() + +Desc: + +--*/ +void storvsc_drv_exit(void) +{ + STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj; + struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx; + + struct device *current_dev=NULL; + +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) +#define driver_for_each_device(drv, start, data, fn) \ + struct list_head *ptr, *n; \ + list_for_each_safe(ptr, n, &((drv)->devices)) {\ + struct device *curr_dev;\ + curr_dev = list_entry(ptr, struct device, driver_list);\ + fn(curr_dev, data);\ + } +#endif // KERNEL_2_6_9 + + DPRINT_ENTER(STORVSC_DRV); + + while (1) + { + current_dev = NULL; + + // Get the device + driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, storvsc_drv_exit_cb); + + if (current_dev == NULL) + break; + + // Initiate removal from the top-down + device_unregister(current_dev); + } + + if (storvsc_drv_obj->Base.OnCleanup) + storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base); + + vmbus_child_driver_unregister(drv_ctx); + + DPRINT_EXIT(STORVSC_DRV); + + return; +} + +/*++ + +Name: storvsc_probe() + +Desc: Add a new device for this driver + +--*/ +static int storvsc_probe(struct device *device) +{ + int ret=0; + + struct driver_context *driver_ctx = driver_to_driver_context(device->driver); + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; + + struct device_context *device_ctx = device_to_device_context(device); + DEVICE_OBJECT* device_obj = &device_ctx->device_obj; + + struct Scsi_Host *host; + struct host_device_context *host_device_ctx; + STORVSC_DEVICE_INFO device_info; + + DPRINT_ENTER(STORVSC_DRV); + + if (!storvsc_drv_obj->Base.OnDeviceAdd) + return -1; + + host = scsi_host_alloc(&scsi_driver, sizeof(struct host_device_context)); + if (!host) + { + DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object"); + return -ENOMEM; + } + + device->driver_data = host; + + host_device_ctx = (struct host_device_context*)host->hostdata; + memset(host_device_ctx, 0, sizeof(struct host_device_context)); + + host_device_ctx->port = host->host_no; + host_device_ctx->device_ctx = device_ctx; + +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) +#elif defined(KERNEL_2_6_27) + INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback); +#else + INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback, device_obj); +#endif + +#if defined(KERNEL_2_6_27) + host_device_ctx->request_pool = + kmem_cache_create + (device_ctx->device.bus_id, + sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize, + 0, + SLAB_HWCACHE_ALIGN, NULL); +#else + host_device_ctx->request_pool = + kmem_cache_create + (device_ctx->device.bus_id, + sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize, + 0, + SLAB_HWCACHE_ALIGN, NULL, NULL); +#endif + + if (!host_device_ctx->request_pool) + { + scsi_host_put(host); + DPRINT_EXIT(STORVSC_DRV); + + return -ENOMEM; + } + + device_info.PortNumber = host->host_no; + // Call to the vsc driver to add the device + ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info); + if (ret != 0) + { + DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device"); + kmem_cache_destroy(host_device_ctx->request_pool); + scsi_host_put(host); + DPRINT_EXIT(STORVSC_DRV); + + return -1; + } + + //host_device_ctx->port = device_info.PortNumber; + host_device_ctx->path = device_info.PathId; + host_device_ctx->target = device_info.TargetId; + + host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; // max # of devices per target + host->max_id = STORVSC_MAX_TARGETS; // max # of targets per channel + host->max_channel = STORVSC_MAX_CHANNELS -1; // max # of channels + + // Register the HBA and start the scsi bus scan + ret = scsi_add_host(host, device); + if (ret != 0) + { + DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device"); + + storvsc_drv_obj->Base.OnDeviceRemove(device_obj); + + kmem_cache_destroy(host_device_ctx->request_pool); + scsi_host_put(host); + DPRINT_EXIT(STORVSC_DRV); + + return -1; + } + + scsi_scan_host(host); + + DPRINT_EXIT(STORVSC_DRV); + + return ret; +} + + +/*++ + +Name: storvsc_remove() + +Desc: Callback when our device is removed + +--*/ +static int storvsc_remove(struct device *device) +{ + int ret=0; + + struct driver_context *driver_ctx = driver_to_driver_context(device->driver); + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; + + struct device_context *device_ctx = device_to_device_context(device); + DEVICE_OBJECT* device_obj = &device_ctx->device_obj; + + struct Scsi_Host *host = (struct Scsi_Host *)device->driver_data; + struct host_device_context *host_device_ctx=(struct host_device_context*)host->hostdata; + + + DPRINT_ENTER(STORVSC_DRV); + + if (!storvsc_drv_obj->Base.OnDeviceRemove) + { + DPRINT_EXIT(STORVSC_DRV); + return -1; + } + + // Call to the vsc driver to let it know that the device is being removed + ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj); + if (ret != 0) + { + // TODO: + DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", ret); + } + + if (host_device_ctx->request_pool) + { + kmem_cache_destroy(host_device_ctx->request_pool); + host_device_ctx->request_pool = NULL; + } + + DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host); + scsi_remove_host(host); + + DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host); + scsi_host_put(host); + + DPRINT_EXIT(STORVSC_DRV); + + return ret; +} + +/*++ + +Name: storvsc_commmand_completion() + +Desc: Command completion processing + +--*/ +static void storvsc_commmand_completion(STORVSC_REQUEST* request) +{ + struct storvsc_cmd_request *cmd_request = (struct storvsc_cmd_request*)request->Context; + struct scsi_cmnd *scmnd = cmd_request->cmd; + struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; + void (*scsi_done_fn)(struct scsi_cmnd *); +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) +#else + struct scsi_sense_hdr sense_hdr; +#endif + + ASSERT(request == &cmd_request->request); + ASSERT((unsigned long)scmnd->host_scribble == (unsigned long)cmd_request); + ASSERT(scmnd); + ASSERT(scmnd->scsi_done); + + DPRINT_ENTER(STORVSC_DRV); + + if (cmd_request->bounce_sgl_count)// using bounce buffer + { + //printk("copy_from_bounce_buffer\n"); + + // FIXME: We can optimize on writes by just skipping this +#ifdef KERNEL_2_6_27 + copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); +#else + copy_from_bounce_buffer(scmnd->request_buffer, cmd_request->bounce_sgl, scmnd->use_sg); +#endif + destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); + } + + scmnd->result = request->Status; + + if (scmnd->result) + { +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) + DPRINT_INFO(STORVSC_DRV, "scsi result nonzero - %d", scmnd->result); +#else + if (scsi_normalize_sense(scmnd->sense_buffer, request->SenseBufferSize, &sense_hdr)) + { + scsi_print_sense_hdr("storvsc", &sense_hdr); + } +#endif + } + + ASSERT(request->BytesXfer <= request->DataBuffer.Length); +#ifdef KERNEL_2_6_27 + scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer); +#else + scmnd->resid = request->DataBuffer.Length - request->BytesXfer; +#endif + + scsi_done_fn = scmnd->scsi_done; + + scmnd->host_scribble = NULL; + scmnd->scsi_done = NULL; + + // !!DO NOT MODIFY the scmnd after this call + scsi_done_fn(scmnd); + + kmem_cache_free(host_device_ctx->request_pool, cmd_request); + + DPRINT_EXIT(STORVSC_DRV); +} + +static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) +{ + int i=0; + + // No need to check + if (sg_count < 2) + return -1; + + // We have at least 2 sg entries + for ( i=0; i<sg_count; i++ ) + { + if (i == 0) // make sure 1st one does not have hole + { + if (sgl[i].offset + sgl[i].length != PAGE_SIZE) + return i; + } + else if (i == sg_count - 1) // make sure last one does not have hole + { + if (sgl[i].offset != 0) + return i; + } + else // make sure no hole in the middle + { + if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0) + { + return i; + } + } + } + return -1; +} + +static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len) +{ + int i; + int num_pages=0; + struct scatterlist* bounce_sgl; + struct page *page_buf; + + num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT; + + bounce_sgl = kzalloc(num_pages * sizeof(struct scatterlist), GFP_ATOMIC); + if (!bounce_sgl) + { + return NULL; + } + + for(i=0; i<num_pages; i++) + { + page_buf = alloc_page(GFP_ATOMIC); + if (!page_buf) + { + goto cleanup; + } +#ifdef KERNEL_2_6_27 + sg_set_page(&bounce_sgl[i], page_buf, 0, 0); +#else + bounce_sgl[i].page = page_buf; + bounce_sgl[i].offset = 0; + bounce_sgl[i].length = 0; +#endif + } + + return bounce_sgl; + +cleanup: + destroy_bounce_buffer(bounce_sgl, num_pages); + return NULL; +} + +static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count) +{ + int i; + struct page *page_buf; + + for (i=0; i<sg_count; i++) + { +#ifdef KERNEL_2_6_27 + if ((page_buf = sg_page((&sgl[i]))) != NULL) +#else + if ((page_buf = sgl[i].page) != NULL) +#endif + + { + __free_page(page_buf); + } + } + + kfree(sgl); +} + +// Assume the bounce_sgl has enough room ie using the create_bounce_buffer() +static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) +{ + int i=0,j=0; + unsigned long src, dest; + unsigned int srclen, destlen, copylen; + unsigned int total_copied=0; + unsigned long bounce_addr=0; + unsigned long src_addr=0; + unsigned long flags; + + local_irq_save(flags); + + for (i=0; i<orig_sgl_count; i++) + { +#ifdef KERNEL_2_6_27 + src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; +#else + src_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset; +#endif + src = src_addr; + srclen = orig_sgl[i].length; + + //if (PageHighMem(orig_sgl[i].page)) + // printk("HighMem page detected - addr %p", (void*)src); + + ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); + + if (j == 0) + { +#ifdef KERNEL_2_6_27 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); +#else + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); +#endif + } + + while (srclen) + { + // assume bounce offset always == 0 + dest = bounce_addr + bounce_sgl[j].length; + destlen = PAGE_SIZE - bounce_sgl[j].length; + + copylen = MIN(srclen, destlen); + memcpy((void*)dest, (void*)src, copylen); + + total_copied += copylen; + bounce_sgl[j].length += copylen; + srclen -= copylen; + src += copylen; + + if (bounce_sgl[j].length == PAGE_SIZE) // full..move to next entry + { + kunmap_atomic((void*)bounce_addr, KM_IRQ0); + j++; + + // if we need to use another bounce buffer + if (srclen || i != orig_sgl_count -1) + { +#ifdef KERNEL_2_6_27 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); +#else + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); +#endif + } + } + else if (srclen == 0 && i == orig_sgl_count -1) // // unmap the last bounce that is < PAGE_SIZE + { + kunmap_atomic((void*)bounce_addr, KM_IRQ0); + } + } + + kunmap_atomic((void*)(src_addr - orig_sgl[i].offset), KM_IRQ0); + } + + local_irq_restore(flags); + + return total_copied; +} + +// Assume the original sgl has enough room +static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count) +{ + int i=0,j=0; + unsigned long src, dest; + unsigned int srclen, destlen, copylen; + unsigned int total_copied=0; + unsigned long bounce_addr=0; + unsigned long dest_addr=0; + unsigned long flags; + + local_irq_save(flags); + + for (i=0; i<orig_sgl_count; i++) + { +#ifdef KERNEL_2_6_27 + dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset; +#else + dest_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset; +#endif + dest = dest_addr; + destlen = orig_sgl[i].length; + ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE); + + if (j == 0) + { +#ifdef KERNEL_2_6_27 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); +#else + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); +#endif + } + + while (destlen) + { + src = bounce_addr + bounce_sgl[j].offset; + srclen = bounce_sgl[j].length - bounce_sgl[j].offset; + + copylen = MIN(srclen, destlen); + memcpy((void*)dest, (void*)src, copylen); + + total_copied += copylen; + bounce_sgl[j].offset += copylen; + destlen -= copylen; + dest += copylen; + + if (bounce_sgl[j].offset == bounce_sgl[j].length) // full + { + kunmap_atomic((void*)bounce_addr, KM_IRQ0); + j++; + + // if we need to use another bounce buffer + if (destlen || i != orig_sgl_count -1) + { +#ifdef KERNEL_2_6_27 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0); +#else + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0); +#endif + } + } + else if (destlen == 0 && i == orig_sgl_count -1) // unmap the last bounce that is < PAGE_SIZE + { + kunmap_atomic((void*)bounce_addr, KM_IRQ0); + } + } + + kunmap_atomic((void*)(dest_addr - orig_sgl[i].offset), KM_IRQ0); + } + + local_irq_restore(flags); + + return total_copied; +} + + +/*++ + +Name: storvsc_queuecommand() + +Desc: Initiate command processing + +--*/ +static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *)) +{ + int ret=0; + struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; + struct device_context *device_ctx=host_device_ctx->device_ctx; + struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; + + STORVSC_REQUEST *request; + struct storvsc_cmd_request *cmd_request; + unsigned int request_size=0; + int i; + struct scatterlist *sgl; + + DPRINT_ENTER(STORVSC_DRV); + +#ifdef KERNEL_2_6_27 + DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d", + scmnd, + scmnd->sc_data_direction, + scsi_sg_count(scmnd), + scsi_sglist(scmnd), + scsi_bufflen(scmnd), + scmnd->device->queue_depth, + scmnd->device->tagged_supported); +#else + DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d", + scmnd, + scmnd->sc_data_direction, + scmnd->use_sg, + scmnd->request_buffer, + scmnd->request_bufflen, + scmnd->device->queue_depth, + scmnd->device->tagged_supported); +#endif + + // If retrying, no need to prep the cmd + if (scmnd->host_scribble) + { + ASSERT(scmnd->scsi_done != NULL); + + cmd_request = (struct storvsc_cmd_request* )scmnd->host_scribble; + DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", scmnd, cmd_request); + + goto retry_request; + } + + ASSERT(scmnd->scsi_done == NULL); + ASSERT(scmnd->host_scribble == NULL); + + scmnd->scsi_done = done; + + request_size = sizeof(struct storvsc_cmd_request); + + cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, GFP_ATOMIC); + if (!cmd_request) + { + DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate storvsc_cmd_request...marking queue busy", scmnd); + + scmnd->scsi_done = NULL; + return SCSI_MLQUEUE_DEVICE_BUSY; + } + + // Setup the cmd request + cmd_request->bounce_sgl_count = 0; + cmd_request->bounce_sgl = NULL; + cmd_request->cmd = scmnd; + + scmnd->host_scribble = (unsigned char*)cmd_request; + + request = &cmd_request->request; + + request->Extension = (void*)((unsigned long)cmd_request + request_size); + DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, storvsc_drv_obj->RequestExtSize); + + // Build the SRB + switch(scmnd->sc_data_direction) + { + case DMA_TO_DEVICE: + request->Type = WRITE_TYPE; + break; + case DMA_FROM_DEVICE: + request->Type = READ_TYPE; + break; + default: + request->Type = UNKNOWN_TYPE; + break; + } + + request->OnIOCompletion = storvsc_commmand_completion; + request->Context = cmd_request;//scmnd; + + //request->PortId = scmnd->device->channel; + request->Host = host_device_ctx->port; + request->Bus = scmnd->device->channel; + request->TargetId = scmnd->device->id; + request->LunId = scmnd->device->lun; + + ASSERT(scmnd->cmd_len <= 16); + request->CdbLen = scmnd->cmd_len; + request->Cdb = scmnd->cmnd; + + request->SenseBuffer = scmnd->sense_buffer; + request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE; + + +#ifdef KERNEL_2_6_27 + request->DataBuffer.Length = scsi_bufflen(scmnd); + if (scsi_sg_count(scmnd)) +#else + request->DataBuffer.Length = scmnd->request_bufflen; + if (scmnd->use_sg) +#endif + { +#ifdef KERNEL_2_6_27 + sgl = (struct scatterlist*)scsi_sglist(scmnd); +#else + sgl = (struct scatterlist*)(scmnd->request_buffer); +#endif + + // check if we need to bounce the sgl +#ifdef KERNEL_2_6_27 + if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) +#else + if (do_bounce_buffer(sgl, scmnd->use_sg) != -1) +#endif + { + DPRINT_INFO(STORVSC_DRV, "need to bounce buffer for this scmnd %p", scmnd); +#ifdef KERNEL_2_6_27 + cmd_request->bounce_sgl = create_bounce_buffer(sgl, scsi_sg_count(scmnd), scsi_bufflen(scmnd)); +#else + cmd_request->bounce_sgl = create_bounce_buffer( + sgl, + scmnd->use_sg, scmnd->request_bufflen); +#endif + if (!cmd_request->bounce_sgl) + { + DPRINT_ERR(STORVSC_DRV, "unable to create bounce buffer for this scmnd %p", scmnd); + + scmnd->scsi_done = NULL; + scmnd->host_scribble = NULL; + kmem_cache_free(host_device_ctx->request_pool, cmd_request); + + return SCSI_MLQUEUE_HOST_BUSY; + } + +#ifdef KERNEL_2_6_27 + cmd_request->bounce_sgl_count = ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT; +#else + cmd_request->bounce_sgl_count = ALIGN_UP(scmnd->request_bufflen, PAGE_SIZE) >> PAGE_SHIFT; +#endif + + //printk("bouncing buffer allocated %p original buffer %p\n", bounce_sgl, sgl); + //printk("copy_to_bounce_buffer\n"); + // FIXME: We can optimize on reads by just skipping this +#ifdef KERNEL_2_6_27 + copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scsi_sg_count(scmnd)); +#else + copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scmnd->use_sg); +#endif + + sgl = cmd_request->bounce_sgl; + } + + request->DataBuffer.Offset = sgl[0].offset; + +#ifdef KERNEL_2_6_27 + for (i = 0; i < scsi_sg_count(scmnd); i++ ) +#else + for (i = 0; i < scmnd->use_sg; i++ ) +#endif + { + DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", i, sgl[i].length, sgl[i].offset); +#ifdef KERNEL_2_6_27 + request->DataBuffer.PfnArray[i] = page_to_pfn(sg_page((&sgl[i]))); +#else + request->DataBuffer.PfnArray[i] = page_to_pfn(sgl[i].page); +#endif + } + } + +#ifdef KERNEL_2_6_27 + else if (scsi_sglist(scmnd)) + { + ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE); + request->DataBuffer.Offset = virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1); + request->DataBuffer.PfnArray[0] = virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT; + } + else + { + ASSERT(scsi_bufflen(scmnd) == 0); + } +#else + else if (scmnd->request_buffer) + { + ASSERT(scmnd->request_bufflen <= PAGE_SIZE); + request->DataBuffer.Offset = virt_to_phys(scmnd->request_buffer) & (PAGE_SIZE-1); + request->DataBuffer.PfnArray[0] = virt_to_phys(scmnd->request_buffer) >> PAGE_SHIFT; + } + else + { + ASSERT(scmnd->request_bufflen == 0); + } +#endif + +retry_request: + + // Invokes the vsc to start an IO + ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, &cmd_request->request); + if (ret == -1) // no more space + { + DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - queue FULL...marking queue busy", scmnd); + + if (cmd_request->bounce_sgl_count) + { + // FIXME: We can optimize on writes by just skipping this +#ifdef KERNEL_2_6_27 + copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); +#else + copy_from_bounce_buffer( + scmnd->request_buffer, + cmd_request->bounce_sgl, + scmnd->use_sg); +#endif + destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count); + } + + kmem_cache_free(host_device_ctx->request_pool, cmd_request); + + scmnd->scsi_done = NULL; + scmnd->host_scribble = NULL; + + ret = SCSI_MLQUEUE_DEVICE_BUSY; + } + + DPRINT_EXIT(STORVSC_DRV); + + return ret; +} + +#ifdef KERNEL_2_6_27 +static int storvsc_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, struct bio_vec *bvec) +{ + return bvec->bv_len; //checking done by caller. +} +#else +static int storvsc_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *bvec) +{ + // Check if we are adding a new bvec + if (bio->bi_vcnt > 0) + { + //printk("storvsc_merge_bvec() - cnt %u offset %u len %u\n", bio->bi_vcnt, bvec->bv_offset, bvec->bv_len); + + struct bio_vec *prev = &bio->bi_io_vec[bio->bi_vcnt - 1]; + if (bvec == prev) + return bvec->bv_len; // success + + // Adding new bvec. Make sure the prev one is a complete page + if (prev->bv_len == PAGE_SIZE && prev->bv_offset == 0) + { + return bvec->bv_len; // success + } + else + { + // Dont reject if the new bvec starts off from the prev one since + // they will be merge into 1 bvec or blk_rq_map_sg() will merge them into 1 sg element + if ((bvec->bv_page == prev->bv_page) && + (bvec->bv_offset == prev->bv_offset + prev->bv_len)) + { + return bvec->bv_len; // success + } + else + { + DPRINT_INFO(STORVSC_DRV, "detected holes in bio request (%p) - cnt %u offset %u len %u", bio, bio->bi_vcnt, bvec->bv_offset, bvec->bv_len); + return 0; // dont add the bvec to this bio since we dont allow holes in the middle of a multi-pages bio + } + } + } + + return bvec->bv_len; // success + +} + +#endif + +/*++ + +Name: storvsc_device_configure() + +Desc: Configure the specified scsi device + +--*/ +static int storvsc_device_alloc(struct scsi_device *sdevice) +{ +#ifdef KERNEL_2_6_5 +#else + DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", sdevice, BLIST_SPARSELUN); + // This enables luns to be located sparsely. Otherwise, we may not discovered them. + sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN; +#endif + return 0; +} + +static int storvsc_device_configure(struct scsi_device *sdevice) +{ + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, sdevice->queue_depth); + + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", sdevice, STORVSC_MAX_IO_REQUESTS); + scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, STORVSC_MAX_IO_REQUESTS); + + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %d", sdevice, PAGE_SIZE); + blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE); + + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", sdevice); + blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec); + + blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY); + //sdevice->timeout = (2000 * HZ);//(75 * HZ); + + return 0; +} + +/*++ + +Name: storvsc_host_reset_handler() + +Desc: Reset the scsi HBA + +--*/ +static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) +{ + int ret=SUCCESS; + struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata; + struct device_context *device_ctx = host_device_ctx->device_ctx; + struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver); + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx; + + STORVSC_DRIVER_OBJECT *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj; + + DPRINT_ENTER(STORVSC_DRV); + + DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", scmnd->device, &device_ctx->device_obj); + + // Invokes the vsc to reset the host/bus + ASSERT(storvsc_drv_obj->OnHostReset); + ret = storvsc_drv_obj->OnHostReset(&device_ctx->device_obj); + if (ret != 0) + { + DPRINT_EXIT(STORVSC_DRV); + return ret; + } + + DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", scmnd->device, &device_ctx->device_obj); + + DPRINT_EXIT(STORVSC_DRV); + + return ret; +} + +/*++ + +Name: storvsc_host_rescan + +Desc: Rescan the scsi HBA + +--*/ +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) +#else + +#ifdef KERNEL_2_6_27 +static void storvsc_host_rescan_callback(struct work_struct *work) +{ + DEVICE_OBJECT* device_obj = + &((struct host_device_context*)work)->device_ctx->device_obj; +#else +static void storvsc_host_rescan_callback(void* context) +{ + + DEVICE_OBJECT* device_obj = (DEVICE_OBJECT*)context; +#endif + struct device_context* device_ctx = to_device_context(device_obj); + struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data; + struct scsi_device *sdev; + struct host_device_context *host_device_ctx; + struct scsi_device **sdevs_remove_list; + unsigned int sdevs_count=0; + unsigned int found; + unsigned int i; + unsigned int lun_count=0; + unsigned int *lun_list; + + DPRINT_ENTER(STORVSC_DRV); + + host_device_ctx = (struct host_device_context*)host->hostdata; + lun_list = kzalloc(sizeof(unsigned int)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC); + if (!lun_list) + { + DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list"); + return; + } + + sdevs_remove_list = kzalloc(sizeof(void*)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC); + if (!sdevs_remove_list) + { + kfree(lun_list); + DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list"); + return; + } + + DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices...", device_obj, host_device_ctx->target, host_device_ctx->path); + + // Rescan for new device + scsi_scan_target(&host->shost_gendev, host_device_ctx->path, host_device_ctx->target, SCAN_WILD_CARD, 1); + + DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device..."); + + // Use the 1st device to send the report luns cmd + shost_for_each_device(sdev, host) + { + lun_count=STORVSC_MAX_LUNS_PER_TARGET; + storvsc_report_luns(sdev, lun_list, &lun_count); + + DPRINT_INFO(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, lun_count); + DPRINT_INFO(STORVSC_DRV, "existing luns on scsi device (%p) host (%d)", sdev, host->host_no); + + scsi_device_put(sdev); + break; + } + + for (i=0; i<lun_count; i++) + { + DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]); + } + + // Rescan for devices that may have been removed. + // We do not have to worry that new devices may have been added since + // this callback is serialized by the workqueue ie add/remove are done here. + shost_for_each_device(sdev, host) + { + // See if this device is still here + found = 0; + for (i=0; i<lun_count; i++) + { + if (sdev->lun == lun_list[i]) + { + found = 1; + break; + } + } + if (!found) + { + DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists", sdev->lun); + sdevs_remove_list[sdevs_count++] = sdev; + } + } + + // Now remove the devices + for (i=0; i< sdevs_count; i++) + { + DPRINT_INFO(STORVSC_DRV, "removing scsi device (%p) lun (%u)...", + sdevs_remove_list[i], sdevs_remove_list[i]->lun); + + // make sure it is not removed from underneath us + if (!scsi_device_get(sdevs_remove_list[i])) + { + scsi_remove_device(sdevs_remove_list[i]); + scsi_device_put(sdevs_remove_list[i]); + } + } + + DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) target (%u) bus (%u)", device_obj, host_device_ctx->target, host_device_ctx->path); + + kfree(lun_list); + kfree(sdevs_remove_list); + + DPRINT_EXIT(STORVSC_DRV); +} + +static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count) +{ + int i,j; + unsigned int lun=0; + unsigned int num_luns; + int result; + unsigned char *data; +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) +#else + struct scsi_sense_hdr sshdr; +#endif + unsigned char cmd[16]={0}; + unsigned int report_len = 8*(STORVSC_MAX_LUNS_PER_TARGET+1); // Add 1 to cover the report_lun header + unsigned long long *report_luns; + const unsigned int in_lun_count = *lun_count; + + *lun_count = 0; + + report_luns = kzalloc(report_len, GFP_ATOMIC); + if (!report_luns) + { + return -ENOMEM; + } + + cmd[0] = REPORT_LUNS; + + // cmd length + *(unsigned int*)&cmd[6] = cpu_to_be32(report_len); + + result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, (unsigned char*)report_luns, report_len, &sshdr, 30*HZ, 3); + if (result != 0) + { + kfree(report_luns); + return -EBUSY; + } + + // get the length from the first four bytes + report_len = be32_to_cpu(*(unsigned int*)&report_luns[0]); + + num_luns = (report_len / sizeof(unsigned long long)); + if (num_luns > in_lun_count) + { + kfree(report_luns); + return -EINVAL; + } + + *lun_count = num_luns; + + DPRINT_DBG(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, num_luns); + + // lun id starts at 1 + for (i=1; i< num_luns+1; i++) + { + lun = 0; + data = (unsigned char*)&report_luns[i]; + for (j = 0; j < sizeof(lun); j += 2) + { + lun = lun | (((data[j] << 8) | data[j + 1]) << (j * 8)); + } + + luns[i-1] = lun; + } + + kfree(report_luns); + return 0; +} +#endif // KERNEL_2_6_9 + +static void storvsc_host_rescan(DEVICE_OBJECT* device_obj) +{ + struct device_context* device_ctx = to_device_context(device_obj); + struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data; + struct host_device_context *host_device_ctx; + + DPRINT_ENTER(STORVSC_DRV); +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) + DPRINT_ERR(STORVSC_DRV, "rescan not supported on 2.6.9 kernels!! You will need to reboot if you have added or removed the scsi lun device"); +#else + + host_device_ctx = (struct host_device_context*)host->hostdata; + + DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) target (%u) bus (%u)...", device_obj, host_device_ctx->target, host_device_ctx->path); + + // We need to queue this since the scanning may block and the caller may be in an intr context + //scsi_queue_work(host, &host_device_ctx->host_rescan_work); + schedule_work(&host_device_ctx->host_rescan_work); +#endif // KERNEL_2_6_9 + DPRINT_EXIT(STORVSC_DRV); +} + +static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info) +{ + sector_t total_sectors = capacity; + sector_t cylinder_times_heads=0; + sector_t temp=0; + + int sectors_per_track=0; + int heads=0; + int cylinders=0; + int rem=0; + + if (total_sectors > (65535 * 16 * 255)) { + total_sectors = (65535 * 16 * 255); + } + + if (total_sectors >= (65535 * 16 * 63)) { + sectors_per_track = 255; + heads = 16; + + cylinder_times_heads = total_sectors; + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads + } + else + { + sectors_per_track = 17; + + cylinder_times_heads = total_sectors; + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads + + temp = cylinder_times_heads + 1023; + rem = sector_div(temp, 1024); // sector_div stores the quotient in temp + + heads = temp; + + if (heads < 4) { + heads = 4; + } + + if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) { + sectors_per_track = 31; + heads = 16; + + cylinder_times_heads = total_sectors; + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads + } + + if (cylinder_times_heads >= (heads * 1024)) { + sectors_per_track = 63; + heads = 16; + + cylinder_times_heads = total_sectors; + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads + } + } + + temp = cylinder_times_heads; + rem = sector_div(temp, heads); // sector_div stores the quotient in temp + cylinders = temp; + + info[0] = heads; + info[1] = sectors_per_track; + info[2] = cylinders; + + DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track); + + return 0; +} + +MODULE_LICENSE("GPL"); + +static int __init storvsc_init(void) +{ + int ret; + + DPRINT_ENTER(STORVSC_DRV); + + DPRINT_INFO(STORVSC_DRV, "Storvsc initializing...."); + + ret = storvsc_drv_init(StorVscInitialize); + + DPRINT_EXIT(STORVSC_DRV); + + return ret; +} + +static void __exit storvsc_exit(void) +{ + DPRINT_ENTER(STORVSC_DRV); + + storvsc_drv_exit(); + + DPRINT_ENTER(STORVSC_DRV); +} + +module_param(storvsc_ringbuffer_size, int, S_IRUGO); + +module_init(storvsc_init); +module_exit(storvsc_exit); + +// eof |