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/* blktaplib.h
*
* Blktap library userspace code.
*
* (c) 2005 Andrew Warfield and Julian Chesterfield
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __BLKTAPLIB_H__
#define __BLKTAPLIB_H__
#include <xenctrl.h>
#include <sys/param.h>
#include <sys/user.h>
#include <xen/xen.h>
#include <xen/io/blkif.h>
#include <xen/io/ring.h>
#include <xs.h>
#include <sys/types.h>
#include <unistd.h>
#define BLK_RING_SIZE __CONST_RING_SIZE(blkif, XC_PAGE_SIZE)
/* size of the extra VMA area to map in attached pages. */
#define BLKTAP_VMA_PAGES BLK_RING_SIZE
/* blktap IOCTLs: These must correspond with the blktap driver ioctls*/
#define BLKTAP_IOCTL_KICK_FE 1
#define BLKTAP_IOCTL_KICK_BE 2
#define BLKTAP_IOCTL_SETMODE 3
#define BLKTAP_IOCTL_SENDPID 4
#define BLKTAP_IOCTL_NEWINTF 5
#define BLKTAP_IOCTL_MINOR 6
#define BLKTAP_IOCTL_MAJOR 7
#define BLKTAP_QUERY_ALLOC_REQS 8
#define BLKTAP_IOCTL_FREEINTF 9
#define BLKTAP_IOCTL_NEWINTF_EXT 50
#define BLKTAP_IOCTL_PRINT_IDXS 100
/* blktap switching modes: (Set with BLKTAP_IOCTL_SETMODE) */
#define BLKTAP_MODE_PASSTHROUGH 0x00000000 /* default */
#define BLKTAP_MODE_INTERCEPT_FE 0x00000001
#define BLKTAP_MODE_INTERCEPT_BE 0x00000002
#define BLKTAP_MODE_INTERPOSE \
(BLKTAP_MODE_INTERCEPT_FE | BLKTAP_MODE_INTERCEPT_BE)
static inline int BLKTAP_MODE_VALID(unsigned long arg)
{
return (
( arg == BLKTAP_MODE_PASSTHROUGH ) ||
( arg == BLKTAP_MODE_INTERCEPT_FE ) ||
( arg == BLKTAP_MODE_INTERPOSE ) );
}
#define MAX_REQUESTS BLK_RING_SIZE
#define BLKTAP_IOCTL_KICK 1
#define MAX_PENDING_REQS BLK_RING_SIZE
#define BLKTAP_DEV_DIR "/dev/xen"
#define BLKTAP_DEV_NAME "blktap"
#define BLKTAP_DEV_MINOR 0
#define BLKTAP_CTRL_DIR "/var/run/tap"
extern int blktap_major;
#define BLKTAP_RING_PAGES 1 /* Front */
#define BLKTAP_MMAP_REGION_SIZE (BLKTAP_RING_PAGES + MMAP_PAGES)
struct blkif;
typedef struct {
blkif_request_t req;
struct blkif *blkif;
int submitting;
int secs_pending;
int16_t status;
} pending_req_t;
struct blkif_ops {
unsigned long long (*get_size)(struct blkif *blkif);
unsigned long (*get_secsize)(struct blkif *blkif);
unsigned int (*get_info)(struct blkif *blkif);
};
typedef struct blkif {
domid_t domid;
long int handle;
long int pdev;
long int readonly;
enum { DISCONNECTED, DISCONNECTING, CONNECTED } state;
struct blkif_ops *ops;
struct blkif *hash_next;
void *prv; /* device-specific data */
void *info; /*Image parameter passing */
pending_req_t pending_list[MAX_REQUESTS];
int devnum;
int fds[2];
int be_id;
int major;
int minor;
pid_t tappid;
int drivertype;
uint16_t cookie;
} blkif_t;
typedef struct blkif_info {
char *params;
} blkif_info_t;
void register_new_devmap_hook(int (*fn)(blkif_t *blkif));
void register_new_unmap_hook(int (*fn)(blkif_t *blkif));
void register_new_blkif_hook(int (*fn)(blkif_t *blkif));
blkif_t *blkif_find_by_handle(domid_t domid, unsigned int handle);
blkif_t *alloc_blkif(domid_t domid);
int blkif_init(blkif_t *blkif, long int handle, long int pdev,
long int readonly);
void free_blkif(blkif_t *blkif);
void __init_blkif(void);
typedef struct busy_state {
int seg_idx;
blkif_request_t *req;
} busy_state_t;
typedef struct tapdev_info {
int fd;
char *mem;
blkif_sring_t *sring;
blkif_back_ring_t fe_ring;
unsigned long vstart;
blkif_t *blkif;
busy_state_t busy;
} tapdev_info_t;
typedef struct domid_translate {
unsigned short domid;
unsigned short busid;
} domid_translate_t ;
typedef struct domid_translate_ext {
unsigned short domid;
uint32_t busid;
} domid_translate_ext_t ;
typedef struct image {
unsigned long long size;
unsigned long secsize;
unsigned int info;
} image_t;
/* 16-byte message header, immediately followed by message payload. */
typedef struct msg_hdr {
uint16_t type;
uint16_t len;
uint16_t drivertype;
uint16_t cookie;
uint8_t readonly;
uint8_t pad[7];
} msg_hdr_t;
typedef struct msg_newdev {
uint8_t devnum;
uint16_t domid;
} msg_newdev_t;
typedef struct msg_pid {
pid_t pid;
} msg_pid_t;
#define READ 0
#define WRITE 1
/*Control Messages between manager and tapdev*/
#define CTLMSG_PARAMS 1
#define CTLMSG_IMG 2
#define CTLMSG_IMG_FAIL 3
#define CTLMSG_NEWDEV 4
#define CTLMSG_NEWDEV_RSP 5
#define CTLMSG_NEWDEV_FAIL 6
#define CTLMSG_CLOSE 7
#define CTLMSG_CLOSE_RSP 8
#define CTLMSG_PID 9
#define CTLMSG_PID_RSP 10
/* disk driver types */
#define MAX_DISK_TYPES 20
#define DISK_TYPE_AIO 0
#define DISK_TYPE_SYNC 1
#define DISK_TYPE_VMDK 2
#define DISK_TYPE_RAM 3
#define DISK_TYPE_QCOW 4
#define DISK_TYPE_QCOW2 5
/* xenstore/xenbus: */
#define DOMNAME "Domain-0"
int setup_probe_watch(struct xs_handle *h);
/* Abitrary values, must match the underlying driver... */
#define MAX_TAP_DEV 100
/* Accessing attached data page mappings */
#define MMAP_PAGES \
(MAX_PENDING_REQS * BLKIF_MAX_SEGMENTS_PER_REQUEST)
#define MMAP_VADDR(_vstart,_req,_seg) \
((_vstart) + \
((_req) * BLKIF_MAX_SEGMENTS_PER_REQUEST * getpagesize()) + \
((_seg) * getpagesize()))
#endif /* __BLKTAPLIB_H__ */
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