| 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 | * Haiyang Zhang <haiyangz@microsoft.com> |
| 20 | * Hank Janssen <hjanssen@microsoft.com> |
| 21 | * |
| 22 | */ |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include "osd.h" |
| 26 | #include "storvsc.c" |
| 27 | |
| 28 | static const char *gBlkDriverName = "blkvsc"; |
| 29 | |
| 30 | /* {32412632-86cb-44a2-9b5c-50d1417354f5} */ |
| 31 | static const struct hv_guid gBlkVscDeviceType = { |
| 32 | .data = { |
| 33 | 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, |
| 34 | 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5 |
| 35 | } |
| 36 | }; |
| 37 | |
| 38 | static int BlkVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo) |
| 39 | { |
| 40 | struct storvsc_device_info *deviceInfo; |
| 41 | int ret = 0; |
| 42 | |
| 43 | deviceInfo = (struct storvsc_device_info *)AdditionalInfo; |
| 44 | |
| 45 | ret = StorVscOnDeviceAdd(Device, AdditionalInfo); |
| 46 | if (ret != 0) |
| 47 | return ret; |
| 48 | |
| 49 | /* |
| 50 | * We need to use the device instance guid to set the path and target |
| 51 | * id. For IDE devices, the device instance id is formatted as |
| 52 | * <bus id> * - <device id> - 8899 - 000000000000. |
| 53 | */ |
| 54 | deviceInfo->PathId = Device->deviceInstance.data[3] << 24 | |
| 55 | Device->deviceInstance.data[2] << 16 | |
| 56 | Device->deviceInstance.data[1] << 8 | |
| 57 | Device->deviceInstance.data[0]; |
| 58 | |
| 59 | deviceInfo->TargetId = Device->deviceInstance.data[5] << 8 | |
| 60 | Device->deviceInstance.data[4]; |
| 61 | |
| 62 | return ret; |
| 63 | } |
| 64 | |
| 65 | int BlkVscInitialize(struct hv_driver *Driver) |
| 66 | { |
| 67 | struct storvsc_driver_object *storDriver; |
| 68 | int ret = 0; |
| 69 | |
| 70 | storDriver = (struct storvsc_driver_object *)Driver; |
| 71 | |
| 72 | /* Make sure we are at least 2 pages since 1 page is used for control */ |
| 73 | /* ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); */ |
| 74 | |
| 75 | Driver->name = gBlkDriverName; |
| 76 | memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(struct hv_guid)); |
| 77 | |
| 78 | storDriver->RequestExtSize = sizeof(struct storvsc_request_extension); |
| 79 | |
| 80 | /* |
| 81 | * Divide the ring buffer data size (which is 1 page less than the ring |
| 82 | * buffer size since that page is reserved for the ring buffer indices) |
| 83 | * by the max request size (which is |
| 84 | * VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + struct vstor_packet + u64) |
| 85 | */ |
| 86 | storDriver->MaxOutstandingRequestsPerChannel = |
| 87 | ((storDriver->RingBufferSize - PAGE_SIZE) / |
| 88 | ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + |
| 89 | sizeof(struct vstor_packet) + sizeof(u64), |
| 90 | sizeof(u64))); |
| 91 | |
| 92 | DPRINT_INFO(BLKVSC, "max io outstd %u", |
| 93 | storDriver->MaxOutstandingRequestsPerChannel); |
| 94 | |
| 95 | /* Setup the dispatch table */ |
| 96 | storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd; |
| 97 | storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove; |
| 98 | storDriver->Base.OnCleanup = StorVscOnCleanup; |
| 99 | storDriver->OnIORequest = StorVscOnIORequest; |
| 100 | |
| 101 | return ret; |
| 102 | } |