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/*
* Virtio SCSI HBA
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#ifndef _QEMU_VIRTIO_SCSI_H
#define _QEMU_VIRTIO_SCSI_H
/* Override CDB/sense data size: they are dynamic (guest controlled) in QEMU */
#define VIRTIO_SCSI_CDB_SIZE 0
#define VIRTIO_SCSI_SENSE_SIZE 0
#include "standard-headers/linux/virtio_scsi.h"
#include "hw/virtio/virtio.h"
#include "hw/pci/pci.h"
#include "hw/scsi/scsi.h"
#include "sysemu/iothread.h"
#include "hw/virtio/dataplane/vring.h"
#define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common"
#define VIRTIO_SCSI_COMMON(obj) \
OBJECT_CHECK(VirtIOSCSICommon, (obj), TYPE_VIRTIO_SCSI_COMMON)
#define TYPE_VIRTIO_SCSI "virtio-scsi-device"
#define VIRTIO_SCSI(obj) \
OBJECT_CHECK(VirtIOSCSI, (obj), TYPE_VIRTIO_SCSI)
#define VIRTIO_SCSI_VQ_SIZE 128
#define VIRTIO_SCSI_MAX_CHANNEL 0
#define VIRTIO_SCSI_MAX_TARGET 255
#define VIRTIO_SCSI_MAX_LUN 16383
typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq;
typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp;
typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq;
typedef struct virtio_scsi_ctrl_tmf_resp VirtIOSCSICtrlTMFResp;
typedef struct virtio_scsi_ctrl_an_req VirtIOSCSICtrlANReq;
typedef struct virtio_scsi_ctrl_an_resp VirtIOSCSICtrlANResp;
typedef struct virtio_scsi_event VirtIOSCSIEvent;
typedef struct virtio_scsi_config VirtIOSCSIConfig;
struct VirtIOSCSIConf {
uint32_t num_queues;
uint32_t max_sectors;
uint32_t cmd_per_lun;
char *vhostfd;
char *wwpn;
uint32_t boot_tpgt;
IOThread *iothread;
};
struct VirtIOSCSI;
typedef struct {
struct VirtIOSCSI *parent;
Vring vring;
EventNotifier host_notifier;
EventNotifier guest_notifier;
} VirtIOSCSIVring;
typedef struct VirtIOSCSICommon {
VirtIODevice parent_obj;
VirtIOSCSIConf conf;
uint32_t sense_size;
uint32_t cdb_size;
VirtQueue *ctrl_vq;
VirtQueue *event_vq;
VirtQueue **cmd_vqs;
} VirtIOSCSICommon;
typedef struct VirtIOSCSIBlkChangeNotifier {
Notifier n;
struct VirtIOSCSI *s;
SCSIDevice *sd;
QTAILQ_ENTRY(VirtIOSCSIBlkChangeNotifier) next;
} VirtIOSCSIBlkChangeNotifier;
typedef struct VirtIOSCSI {
VirtIOSCSICommon parent_obj;
SCSIBus bus;
int resetting;
bool events_dropped;
/* Fields for dataplane below */
AioContext *ctx; /* one iothread per virtio-scsi-pci for now */
QTAILQ_HEAD(, VirtIOSCSIBlkChangeNotifier) insert_notifiers;
QTAILQ_HEAD(, VirtIOSCSIBlkChangeNotifier) remove_notifiers;
/* Vring is used instead of vq in dataplane code, because of the underlying
* memory layer thread safety */
VirtIOSCSIVring *ctrl_vring;
VirtIOSCSIVring *event_vring;
VirtIOSCSIVring **cmd_vrings;
bool dataplane_started;
bool dataplane_starting;
bool dataplane_stopping;
bool dataplane_disabled;
bool dataplane_fenced;
Error *blocker;
Notifier migration_state_notifier;
uint32_t host_features;
} VirtIOSCSI;
typedef struct VirtIOSCSIReq {
/* Note:
* - fields up to resp_iov are initialized by virtio_scsi_init_req;
* - fields starting at vring are zeroed by virtio_scsi_init_req.
* */
VirtQueueElement elem;
VirtIOSCSI *dev;
VirtQueue *vq;
QEMUSGList qsgl;
QEMUIOVector resp_iov;
/* Set by dataplane code. */
VirtIOSCSIVring *vring;
union {
/* Used for two-stage request submission */
QTAILQ_ENTRY(VirtIOSCSIReq) next;
/* Used for cancellation of request during TMFs */
int remaining;
};
SCSIRequest *sreq;
size_t resp_size;
enum SCSIXferMode mode;
union {
VirtIOSCSICmdResp cmd;
VirtIOSCSICtrlTMFResp tmf;
VirtIOSCSICtrlANResp an;
VirtIOSCSIEvent event;
} resp;
union {
VirtIOSCSICmdReq cmd;
VirtIOSCSICtrlTMFReq tmf;
VirtIOSCSICtrlANReq an;
} req;
} VirtIOSCSIReq;
typedef void (*HandleOutput)(VirtIODevice *, VirtQueue *);
void virtio_scsi_common_realize(DeviceState *dev, Error **errp,
HandleOutput ctrl, HandleOutput evt,
HandleOutput cmd);
void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp);
void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req);
bool virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req);
void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req);
void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req);
void virtio_scsi_free_req(VirtIOSCSIReq *req);
void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
uint32_t event, uint32_t reason);
void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread *iothread);
void virtio_scsi_dataplane_start(VirtIOSCSI *s);
void virtio_scsi_dataplane_stop(VirtIOSCSI *s);
void virtio_scsi_vring_push_notify(VirtIOSCSIReq *req);
VirtIOSCSIReq *virtio_scsi_pop_req_vring(VirtIOSCSI *s,
VirtIOSCSIVring *vring);
#endif /* _QEMU_VIRTIO_SCSI_H */
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