335 lines
8.9 KiB
C
335 lines
8.9 KiB
C
/*
|
|
*
|
|
* Copyright (c) 2011, 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>
|
|
* K. Y. Srinivasan <kys@microsoft.com>
|
|
*
|
|
*/
|
|
|
|
#ifndef _HYPERV_STORAGE_H
|
|
#define _HYPERV_STORAGE_H
|
|
|
|
|
|
/* vstorage.w revision number. This is used in the case of a version match, */
|
|
/* to alert the user that structure sizes may be mismatched even though the */
|
|
/* protocol versions match. */
|
|
|
|
|
|
#define REVISION_STRING(REVISION_) #REVISION_
|
|
#define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \
|
|
do { \
|
|
char *revision_string \
|
|
= REVISION_STRING($Rev : 6 $) + 6; \
|
|
RESULT_LVALUE_ = 0; \
|
|
while (*revision_string >= '0' \
|
|
&& *revision_string <= '9') { \
|
|
RESULT_LVALUE_ *= 10; \
|
|
RESULT_LVALUE_ += *revision_string - '0'; \
|
|
revision_string++; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Major/minor macros. Minor version is in LSB, meaning that earlier flat */
|
|
/* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */
|
|
#define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff)
|
|
#define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff)
|
|
#define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
|
|
(((MINOR_) & 0xff)))
|
|
#define VMSTOR_INVALID_PROTOCOL_VERSION (-1)
|
|
|
|
/* Version history: */
|
|
/* V1 Beta 0.1 */
|
|
/* V1 RC < 2008/1/31 1.0 */
|
|
/* V1 RC > 2008/1/31 2.0 */
|
|
#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0)
|
|
|
|
|
|
|
|
|
|
/* This will get replaced with the max transfer length that is possible on */
|
|
/* the host adapter. */
|
|
/* The max transfer length will be published when we offer a vmbus channel. */
|
|
#define MAX_TRANSFER_LENGTH 0x40000
|
|
#define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \
|
|
sizeof(struct vstor_packet) + \
|
|
sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE)))
|
|
|
|
|
|
/* Packet structure describing virtual storage requests. */
|
|
enum vstor_packet_operation {
|
|
VSTOR_OPERATION_COMPLETE_IO = 1,
|
|
VSTOR_OPERATION_REMOVE_DEVICE = 2,
|
|
VSTOR_OPERATION_EXECUTE_SRB = 3,
|
|
VSTOR_OPERATION_RESET_LUN = 4,
|
|
VSTOR_OPERATION_RESET_ADAPTER = 5,
|
|
VSTOR_OPERATION_RESET_BUS = 6,
|
|
VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
|
|
VSTOR_OPERATION_END_INITIALIZATION = 8,
|
|
VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
|
|
VSTOR_OPERATION_QUERY_PROPERTIES = 10,
|
|
VSTOR_OPERATION_MAXIMUM = 10
|
|
};
|
|
|
|
/*
|
|
* Platform neutral description of a scsi request -
|
|
* this remains the same across the write regardless of 32/64 bit
|
|
* note: it's patterned off the SCSI_PASS_THROUGH structure
|
|
*/
|
|
#define CDB16GENERIC_LENGTH 0x10
|
|
|
|
#ifndef SENSE_BUFFER_SIZE
|
|
#define SENSE_BUFFER_SIZE 0x12
|
|
#endif
|
|
|
|
#define MAX_DATA_BUF_LEN_WITH_PADDING 0x14
|
|
|
|
struct vmscsi_request {
|
|
unsigned short length;
|
|
unsigned char srb_status;
|
|
unsigned char scsi_status;
|
|
|
|
unsigned char port_number;
|
|
unsigned char path_id;
|
|
unsigned char target_id;
|
|
unsigned char lun;
|
|
|
|
unsigned char cdb_length;
|
|
unsigned char sense_info_length;
|
|
unsigned char data_in;
|
|
unsigned char reserved;
|
|
|
|
unsigned int data_transfer_length;
|
|
|
|
union {
|
|
unsigned char cdb[CDB16GENERIC_LENGTH];
|
|
unsigned char sense_data[SENSE_BUFFER_SIZE];
|
|
unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING];
|
|
};
|
|
} __attribute((packed));
|
|
|
|
|
|
/*
|
|
* This structure is sent during the intialization phase to get the different
|
|
* properties of the channel.
|
|
*/
|
|
struct vmstorage_channel_properties {
|
|
unsigned short protocol_version;
|
|
unsigned char path_id;
|
|
unsigned char target_id;
|
|
|
|
/* Note: port number is only really known on the client side */
|
|
unsigned int port_number;
|
|
unsigned int flags;
|
|
unsigned int max_transfer_bytes;
|
|
|
|
/* This id is unique for each channel and will correspond with */
|
|
/* vendor specific data in the inquirydata */
|
|
unsigned long long unique_id;
|
|
} __packed;
|
|
|
|
/* This structure is sent during the storage protocol negotiations. */
|
|
struct vmstorage_protocol_version {
|
|
/* Major (MSW) and minor (LSW) version numbers. */
|
|
unsigned short major_minor;
|
|
|
|
/*
|
|
* Revision number is auto-incremented whenever this file is changed
|
|
* (See FILL_VMSTOR_REVISION macro above). Mismatch does not
|
|
* definitely indicate incompatibility--but it does indicate mismatched
|
|
* builds.
|
|
*/
|
|
unsigned short revision;
|
|
} __packed;
|
|
|
|
/* Channel Property Flags */
|
|
#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
|
|
#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
|
|
|
|
struct vstor_packet {
|
|
/* Requested operation type */
|
|
enum vstor_packet_operation operation;
|
|
|
|
/* Flags - see below for values */
|
|
unsigned int flags;
|
|
|
|
/* Status of the request returned from the server side. */
|
|
unsigned int status;
|
|
|
|
/* Data payload area */
|
|
union {
|
|
/*
|
|
* Structure used to forward SCSI commands from the
|
|
* client to the server.
|
|
*/
|
|
struct vmscsi_request vm_srb;
|
|
|
|
/* Structure used to query channel properties. */
|
|
struct vmstorage_channel_properties storage_channel_properties;
|
|
|
|
/* Used during version negotiations. */
|
|
struct vmstorage_protocol_version version;
|
|
};
|
|
} __packed;
|
|
|
|
/* Packet flags */
|
|
/*
|
|
* This flag indicates that the server should send back a completion for this
|
|
* packet.
|
|
*/
|
|
#define REQUEST_COMPLETION_FLAG 0x1
|
|
|
|
/* This is the set of flags that the vsc can set in any packets it sends */
|
|
#define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG)
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/wait.h>
|
|
#include "hyperv_storage.h"
|
|
#include "hyperv.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;
|
|
};
|
|
|
|
|
|
struct storvsc_device_info {
|
|
u32 ring_buffer_size;
|
|
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;
|
|
|
|
bool drain_notify;
|
|
atomic_t num_outstanding_req;
|
|
|
|
wait_queue_head_t waiting_to_drain;
|
|
|
|
/*
|
|
* 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 void storvsc_wait_to_drain(struct storvsc_device *dev)
|
|
{
|
|
dev->drain_notify = true;
|
|
wait_event(dev->waiting_to_drain,
|
|
atomic_read(&dev->num_outstanding_req) == 0);
|
|
dev->drain_notify = false;
|
|
}
|
|
|
|
/* Interface */
|
|
|
|
int storvsc_dev_add(struct hv_device *device,
|
|
void *additional_info);
|
|
int storvsc_dev_remove(struct hv_device *device);
|
|
|
|
int storvsc_do_io(struct hv_device *device,
|
|
struct hv_storvsc_request *request);
|
|
|
|
int storvsc_get_major_info(struct storvsc_device_info *device_info,
|
|
struct storvsc_major_info *major_info);
|
|
|
|
#endif /* _HYPERV_STORAGE_H */
|