109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include "StorVsc.c"
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static const char* gBlkDriverName="blkvsc";
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/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
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static const GUID gBlkVscDeviceType={
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.Data = {0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5}
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};
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/* Static routines */
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static int
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BlkVscOnDeviceAdd(
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struct hv_device *Device,
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void *AdditionalInfo
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);
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int
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BlkVscInitialize(
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struct hv_driver *Driver
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)
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{
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STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver;
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int ret=0;
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DPRINT_ENTER(BLKVSC);
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/* Make sure we are at least 2 pages since 1 page is used for control */
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ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1));
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Driver->name = gBlkDriverName;
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memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(GUID));
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storDriver->RequestExtSize = sizeof(STORVSC_REQUEST_EXTENSION);
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/* 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) */
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/* by the max request size (which is VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + VSTOR_PACKET + u64) */
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storDriver->MaxOutstandingRequestsPerChannel =
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((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(u64),sizeof(u64)));
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DPRINT_INFO(BLKVSC, "max io outstd %u", storDriver->MaxOutstandingRequestsPerChannel);
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/* Setup the dispatch table */
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storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd;
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storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove;
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storDriver->Base.OnCleanup = StorVscOnCleanup;
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storDriver->OnIORequest = StorVscOnIORequest;
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DPRINT_EXIT(BLKVSC);
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return ret;
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}
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int
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BlkVscOnDeviceAdd(
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struct hv_device *Device,
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void *AdditionalInfo
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)
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{
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int ret=0;
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STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo;
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DPRINT_ENTER(BLKVSC);
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ret = StorVscOnDeviceAdd(Device, AdditionalInfo);
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if (ret != 0)
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{
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DPRINT_EXIT(BLKVSC);
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return ret;
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}
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/* We need to use the device instance guid to set the path and target id. For IDE devices, the */
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/* device instance id is formatted as <bus id> - <device id> - 8899 - 000000000000. */
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deviceInfo->PathId = Device->deviceInstance.Data[3] << 24 | Device->deviceInstance.Data[2] << 16 |
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Device->deviceInstance.Data[1] << 8 |Device->deviceInstance.Data[0];
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deviceInfo->TargetId = Device->deviceInstance.Data[5] << 8 | Device->deviceInstance.Data[4];
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DPRINT_EXIT(BLKVSC);
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return ret;
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}
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