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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 *g_blk_driver_name = "blkvsc";
/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
static const struct hv_guid g_blk_device_type = {
.data = {
0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
}
};
static int blk_vsc_on_device_add(struct hv_device *device, void *additional_info)
{
struct storvsc_device_info *device_info;
int ret = 0;
device_info = (struct storvsc_device_info *)additional_info;
ret = stor_vsc_on_device_add(device, additional_info);
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.
*/
device_info->path_id = device->deviceInstance.data[3] << 24 |
device->deviceInstance.data[2] << 16 |
device->deviceInstance.data[1] << 8 |
device->deviceInstance.data[0];
device_info->target_id = device->deviceInstance.data[5] << 8 |
device->deviceInstance.data[4];
return ret;
}
int blk_vsc_initialize(struct hv_driver *driver)
{
struct storvsc_driver_object *stor_driver;
int ret = 0;
stor_driver = (struct storvsc_driver_object *)driver;
/* Make sure we are at least 2 pages since 1 page is used for control */
/* ASSERT(stor_driver->RingBufferSize >= (PAGE_SIZE << 1)); */
driver->name = g_blk_driver_name;
memcpy(&driver->deviceType, &g_blk_device_type, sizeof(struct hv_guid));
stor_driver->request_ext_size = 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_multipage_buffer + struct vstor_packet + u64)
*/
stor_driver->max_outstanding_req_per_channel =
((stor_driver->ring_buffer_size - PAGE_SIZE) /
ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET +
sizeof(struct vstor_packet) + sizeof(u64),
sizeof(u64)));
DPRINT_INFO(BLKVSC, "max io outstd %u",
stor_driver->max_outstanding_req_per_channel);
/* Setup the dispatch table */
stor_driver->base.OnDeviceAdd = blk_vsc_on_device_add;
stor_driver->base.OnDeviceRemove = stor_vsc_on_device_remove;
stor_driver->base.OnCleanup = stor_vsc_on_cleanup;
stor_driver->on_io_request = stor_vsc_on_io_request;
return ret;
}
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