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/*
*
* 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:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
*
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include "osd.h"
#include "storvsc.c"
static const char *gBlkDriverName = "blkvsc";
/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
static const struct hv_guid gBlkVscDeviceType = {
.data = {
0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
}
};
static int BlkVscOnDeviceAdd(struct hv_device *Device, void *AdditionalInfo)
{
struct storvsc_device_info *deviceInfo;
int ret = 0;
deviceInfo = (struct storvsc_device_info *)AdditionalInfo;
ret = StorVscOnDeviceAdd(Device, AdditionalInfo);
if (ret != 0)
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];
return ret;
}
int BlkVscInitialize(struct hv_driver *Driver)
{
struct storvsc_driver_object *storDriver;
int ret = 0;
storDriver = (struct storvsc_driver_object *)Driver;
/* 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(struct hv_guid));
storDriver->RequestExtSize = sizeof(struct 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 + struct vstor_packet + u64)
*/
storDriver->MaxOutstandingRequestsPerChannel =
((storDriver->RingBufferSize - PAGE_SIZE) /
ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET +
sizeof(struct 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;
return ret;
}
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