3 * Copyright (c) 2009, Microsoft Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
19 * Hank Janssen <hjanssen@microsoft.com>
23 #include <linux/kernel.h>
27 static const char* gBlkDriverName="blkvsc";
29 //{32412632-86cb-44a2-9b5c-50d1417354f5}
30 static const GUID gBlkVscDeviceType={
31 .Data = {0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5}
37 DEVICE_OBJECT *Device,
47 STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver;
52 // Make sure we are at least 2 pages since 1 page is used for control
53 ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1));
55 Driver->name = gBlkDriverName;
56 memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(GUID));
58 storDriver->RequestExtSize = sizeof(STORVSC_REQUEST_EXTENSION);
59 // 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)
60 // by the max request size (which is VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + VSTOR_PACKET + u64)
61 storDriver->MaxOutstandingRequestsPerChannel =
62 ((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(u64),sizeof(u64)));
64 DPRINT_INFO(BLKVSC, "max io outstd %u", storDriver->MaxOutstandingRequestsPerChannel);
66 // Setup the dispatch table
67 storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd;
68 storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove;
69 storDriver->Base.OnCleanup = StorVscOnCleanup;
71 storDriver->OnIORequest = StorVscOnIORequest;
80 DEVICE_OBJECT *Device,
85 STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo;
89 ret = StorVscOnDeviceAdd(Device, AdditionalInfo);
98 // We need to use the device instance guid to set the path and target id. For IDE devices, the
99 // device instance id is formatted as <bus id> - <device id> - 8899 - 000000000000.
100 deviceInfo->PathId = Device->deviceInstance.Data[3] << 24 | Device->deviceInstance.Data[2] << 16 |
101 Device->deviceInstance.Data[1] << 8 |Device->deviceInstance.Data[0];
103 deviceInfo->TargetId = Device->deviceInstance.Data[5] << 8 | Device->deviceInstance.Data[4];