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f82bd046 HJ |
1 | /* |
2 | * | |
3 | * Copyright (c) 2009, Microsoft Corporation. | |
4 | * | |
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. | |
8 | * | |
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 | |
12 | * more details. | |
13 | * | |
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. | |
17 | * | |
18 | * Authors: | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
20 | * | |
21 | */ | |
22 | ||
5654e932 | 23 | #include <linux/kernel.h> |
0ffa63b0 | 24 | #include <linux/mm.h> |
0fce4c2f | 25 | #include "StorVsc.c" |
f82bd046 HJ |
26 | |
27 | static const char* gBlkDriverName="blkvsc"; | |
28 | ||
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} | |
32 | }; | |
33 | ||
34 | // Static routines | |
35 | static int | |
36 | BlkVscOnDeviceAdd( | |
37 | DEVICE_OBJECT *Device, | |
38 | void *AdditionalInfo | |
39 | ); | |
40 | ||
41 | ||
42 | int | |
43 | BlkVscInitialize( | |
44 | DRIVER_OBJECT *Driver | |
45 | ) | |
46 | { | |
47 | STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver; | |
48 | int ret=0; | |
49 | ||
50 | DPRINT_ENTER(BLKVSC); | |
51 | ||
52 | // Make sure we are at least 2 pages since 1 page is used for control | |
53 | ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); | |
54 | ||
55 | Driver->name = gBlkDriverName; | |
56 | memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(GUID)); | |
57 | ||
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) | |
59471438 | 60 | // by the max request size (which is VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + VSTOR_PACKET + u64) |
f82bd046 | 61 | storDriver->MaxOutstandingRequestsPerChannel = |
59471438 | 62 | ((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(u64),sizeof(u64))); |
f82bd046 HJ |
63 | |
64 | DPRINT_INFO(BLKVSC, "max io outstd %u", storDriver->MaxOutstandingRequestsPerChannel); | |
65 | ||
66 | // Setup the dispatch table | |
67 | storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd; | |
68 | storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove; | |
69 | storDriver->Base.OnCleanup = StorVscOnCleanup; | |
70 | ||
71 | storDriver->OnIORequest = StorVscOnIORequest; | |
72 | ||
73 | DPRINT_EXIT(BLKVSC); | |
74 | ||
75 | return ret; | |
76 | } | |
77 | ||
78 | int | |
79 | BlkVscOnDeviceAdd( | |
80 | DEVICE_OBJECT *Device, | |
81 | void *AdditionalInfo | |
82 | ) | |
83 | { | |
84 | int ret=0; | |
85 | STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo; | |
86 | ||
87 | DPRINT_ENTER(BLKVSC); | |
88 | ||
89 | ret = StorVscOnDeviceAdd(Device, AdditionalInfo); | |
90 | ||
91 | if (ret != 0) | |
92 | { | |
93 | DPRINT_EXIT(BLKVSC); | |
94 | ||
95 | return ret; | |
96 | } | |
97 | ||
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]; | |
102 | ||
103 | deviceInfo->TargetId = Device->deviceInstance.Data[5] << 8 | Device->deviceInstance.Data[4]; | |
104 | ||
105 | DPRINT_EXIT(BLKVSC); | |
106 | ||
107 | return ret; | |
108 | } |