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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>
*
*/
#ifndef _STORVSC_API_H_
#define _STORVSC_API_H_
#include <linux/kernel.h>
#include "vstorage.h"
#include "vmbus_api.h"
#include "vmbus.h"
/* Defines */
#define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
#define BLKVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
#define STORVSC_MAX_IO_REQUESTS 128
/*
* In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
* reality, the path/target is not used (ie always set to 0) so our
* scsi host adapter essentially has 1 bus with 1 target that contains
* up to 256 luns.
*/
#define STORVSC_MAX_LUNS_PER_TARGET 64
#define STORVSC_MAX_TARGETS 1
#define STORVSC_MAX_CHANNELS 1
struct hv_storvsc_request;
/* Matches Windows-end */
enum storvsc_request_type{
WRITE_TYPE,
READ_TYPE,
UNKNOWN_TYPE,
};
struct hv_storvsc_request {
struct hv_storvsc_request *request;
struct hv_device *device;
/* Synchronize the request/response if needed */
struct completion wait_event;
unsigned char *sense_buffer;
void *context;
void (*on_io_completion)(struct hv_storvsc_request *request);
struct hv_multipage_buffer data_buffer;
struct vstor_packet vstor_packet;
};
/* Represents the block vsc driver */
struct storvsc_driver_object {
struct hv_driver base;
/* Set by caller (in bytes) */
u32 ring_buffer_size;
/* Maximum # of requests in flight per channel/device */
u32 max_outstanding_req_per_channel;
/* Specific to this driver */
int (*on_io_request)(struct hv_device *device,
struct hv_storvsc_request *request);
};
struct storvsc_device_info {
unsigned int port_number;
unsigned char path_id;
unsigned char target_id;
};
struct storvsc_major_info {
int major;
int index;
bool do_register;
char *devname;
char *diskname;
};
/* A storvsc device is a device object that contains a vmbus channel */
struct storvsc_device {
struct hv_device *device;
/* 0 indicates the device is being destroyed */
atomic_t ref_count;
atomic_t num_outstanding_req;
/*
* Each unique Port/Path/Target represents 1 channel ie scsi
* controller. In reality, the pathid, targetid is always 0
* and the port is set by us
*/
unsigned int port_number;
unsigned char path_id;
unsigned char target_id;
/* Used for vsc/vsp channel reset process */
struct hv_storvsc_request init_request;
struct hv_storvsc_request reset_request;
};
/* Get the stordevice object iff exists and its refcount > 1 */
static inline struct storvsc_device *get_stor_device(struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = (struct storvsc_device *)device->ext;
if (stor_device && atomic_read(&stor_device->ref_count) > 1)
atomic_inc(&stor_device->ref_count);
else
stor_device = NULL;
return stor_device;
}
static inline void put_stor_device(struct hv_device *device)
{
struct storvsc_device *stor_device;
stor_device = (struct storvsc_device *)device->ext;
atomic_dec(&stor_device->ref_count);
}
static inline struct storvsc_driver_object *hvdr_to_stordr(struct hv_driver *d)
{
return container_of(d, struct storvsc_driver_object, base);
}
static inline
struct storvsc_driver_object *drv_to_stordrv(struct device_driver *d)
{
struct hv_driver *hvdrv = drv_to_hv_drv(d);
return hvdr_to_stordr(hvdrv);
}
/* Interface */
int stor_vsc_on_device_add(struct hv_device *device,
void *additional_info);
int stor_vsc_on_device_remove(struct hv_device *device);
int stor_vsc_on_io_request(struct hv_device *device,
struct hv_storvsc_request *request);
void stor_vsc_on_cleanup(struct hv_driver *driver);
int stor_vsc_get_major_info(struct storvsc_device_info *device_info,
struct storvsc_major_info *major_info);
#endif /* _STORVSC_API_H_ */
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