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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
#include "qom/object.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 "chardev/char-fe.h"
#include "sysemu/iothread.h"
#define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common"
typedef struct VirtIOSCSICommon VirtIOSCSICommon;
DECLARE_INSTANCE_CHECKER(VirtIOSCSICommon, VIRTIO_SCSI_COMMON,
TYPE_VIRTIO_SCSI_COMMON)
#define TYPE_VIRTIO_SCSI "virtio-scsi-device"
typedef struct VirtIOSCSI VirtIOSCSI;
DECLARE_INSTANCE_CHECKER(VirtIOSCSI, VIRTIO_SCSI,
TYPE_VIRTIO_SCSI)
#define VIRTIO_SCSI_MAX_CHANNEL 0
#define VIRTIO_SCSI_MAX_TARGET 255
#define VIRTIO_SCSI_MAX_LUN 16383
/* Number of virtqueues that are always present */
#define VIRTIO_SCSI_VQ_NUM_FIXED 2
#define VIRTIO_SCSI_AUTO_NUM_QUEUES UINT32_MAX
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 virtqueue_size;
bool seg_max_adjust;
uint32_t max_sectors;
uint32_t cmd_per_lun;
#ifdef CONFIG_VHOST_SCSI
char *vhostfd;
char *wwpn;
#endif
CharBackend chardev;
uint32_t boot_tpgt;
IOThread *iothread;
};
struct VirtIOSCSI;
struct VirtIOSCSICommon {
VirtIODevice parent_obj;
VirtIOSCSIConf conf;
uint32_t sense_size;
uint32_t cdb_size;
VirtQueue *ctrl_vq;
VirtQueue *event_vq;
VirtQueue **cmd_vqs;
};
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 */
bool dataplane_started;
bool dataplane_starting;
bool dataplane_stopping;
bool dataplane_fenced;
uint32_t host_features;
};
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;
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;
static inline void virtio_scsi_acquire(VirtIOSCSI *s)
{
if (s->ctx) {
aio_context_acquire(s->ctx);
}
}
static inline void virtio_scsi_release(VirtIOSCSI *s)
{
if (s->ctx) {
aio_context_release(s->ctx);
}
}
void virtio_scsi_common_realize(DeviceState *dev,
VirtIOHandleOutput ctrl,
VirtIOHandleOutput evt,
VirtIOHandleOutput cmd,
Error **errp);
void virtio_scsi_common_unrealize(DeviceState *dev);
bool virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq);
bool virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq);
bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq);
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_dataplane_setup(VirtIOSCSI *s, Error **errp);
int virtio_scsi_dataplane_start(VirtIODevice *s);
void virtio_scsi_dataplane_stop(VirtIODevice *s);
#endif /* QEMU_VIRTIO_SCSI_H */
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