diff options
Diffstat (limited to 'drivers/staging/hv/BlkVsc.c')
-rw-r--r-- | drivers/staging/hv/BlkVsc.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/staging/hv/BlkVsc.c b/drivers/staging/hv/BlkVsc.c new file mode 100644 index 000000000000..526a0ab89975 --- /dev/null +++ b/drivers/staging/hv/BlkVsc.c @@ -0,0 +1,108 @@ +/* + * + * Copyright (c) 2009, Microsoft Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Hank Janssen <hjanssen@microsoft.com> + * + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include "StorVsc.c" + +static const char* gBlkDriverName="blkvsc"; + +/* {32412632-86cb-44a2-9b5c-50d1417354f5} */ +static const GUID gBlkVscDeviceType={ + .Data = {0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5} +}; + +/* Static routines */ +static int +BlkVscOnDeviceAdd( + struct hv_device *Device, + void *AdditionalInfo + ); + + +int +BlkVscInitialize( + struct hv_driver *Driver + ) +{ + STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver; + int ret=0; + + DPRINT_ENTER(BLKVSC); + + /* Make sure we are at least 2 pages since 1 page is used for control */ + ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1)); + + Driver->name = gBlkDriverName; + memcpy(&Driver->deviceType, &gBlkVscDeviceType, sizeof(GUID)); + + storDriver->RequestExtSize = sizeof(STORVSC_REQUEST_EXTENSION); + /* 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) */ + /* by the max request size (which is VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + VSTOR_PACKET + u64) */ + storDriver->MaxOutstandingRequestsPerChannel = + ((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(u64),sizeof(u64))); + + DPRINT_INFO(BLKVSC, "max io outstd %u", storDriver->MaxOutstandingRequestsPerChannel); + + /* Setup the dispatch table */ + storDriver->Base.OnDeviceAdd = BlkVscOnDeviceAdd; + storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove; + storDriver->Base.OnCleanup = StorVscOnCleanup; + + storDriver->OnIORequest = StorVscOnIORequest; + + DPRINT_EXIT(BLKVSC); + + return ret; +} + +static int +BlkVscOnDeviceAdd( + struct hv_device *Device, + void *AdditionalInfo + ) +{ + int ret=0; + STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo; + + DPRINT_ENTER(BLKVSC); + + ret = StorVscOnDeviceAdd(Device, AdditionalInfo); + + if (ret != 0) + { + DPRINT_EXIT(BLKVSC); + + return ret; + } + + /* We need to use the device instance guid to set the path and target id. For IDE devices, the */ + /* device instance id is formatted as <bus id> - <device id> - 8899 - 000000000000. */ + deviceInfo->PathId = Device->deviceInstance.Data[3] << 24 | Device->deviceInstance.Data[2] << 16 | + Device->deviceInstance.Data[1] << 8 |Device->deviceInstance.Data[0]; + + deviceInfo->TargetId = Device->deviceInstance.Data[5] << 8 | Device->deviceInstance.Data[4]; + + DPRINT_EXIT(BLKVSC); + + return ret; +} |