--- /dev/null
+From foo@baz Mon Jul 13 16:01:31 PDT 2009
+Date: Mon, 13 Jul 2009 16:01:31 -0700
+From: Hank Janssen <hjanssen@microsoft.com>
+Subject: Staging: hv: add the Hyper-V virtual storage driver
+
+From: Hank Janssen <hjanssen@microsoft.com>
+
+This is the virtual storage driver when running Linux on top of Hyper-V.
+
+Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
+Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
+---
+ drivers/staging/hv/StorVsc.c | 967 ++++++++++++++++++++++++++
+ drivers/staging/hv/storvsc_drv.c | 1413 +++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 2380 insertions(+)
+
+--- /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;
++}
+--- /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
projects / people / teissler / ipfire-2.x.git / blobdiff