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 28static const char *gBlkDriverName = "blkvsc"; 29 30/* {32412632-86cb-44a2-9b5c-50d1417354f5} */ 31static 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 38static 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 65int 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} 103