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qemu/include/hw/virtio/virtio-scsi.h
Fam Zheng 1880ad4f4e virtio-scsi: Batched prepare for cmd reqs 
Queue the popped requests while calling
virtio_scsi_handle_cmd_req_prepare(), then submit them after all
prepared.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-09-30 11:11:20 +02:00

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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 "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)
/* The ID for virtio_scsi */
#define VIRTIO_ID_SCSI 8
/* Feature Bits */
#define VIRTIO_SCSI_F_INOUT 0
#define VIRTIO_SCSI_F_HOTPLUG 1
#define VIRTIO_SCSI_F_CHANGE 2
#define VIRTIO_SCSI_VQ_SIZE 128
#define VIRTIO_SCSI_CDB_SIZE 32
#define VIRTIO_SCSI_SENSE_SIZE 96
#define VIRTIO_SCSI_MAX_CHANNEL 0
#define VIRTIO_SCSI_MAX_TARGET 255
#define VIRTIO_SCSI_MAX_LUN 16383
/* Response codes */
#define VIRTIO_SCSI_S_OK 0
#define VIRTIO_SCSI_S_OVERRUN 1
#define VIRTIO_SCSI_S_ABORTED 2
#define VIRTIO_SCSI_S_BAD_TARGET 3
#define VIRTIO_SCSI_S_RESET 4
#define VIRTIO_SCSI_S_BUSY 5
#define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6
#define VIRTIO_SCSI_S_TARGET_FAILURE 7
#define VIRTIO_SCSI_S_NEXUS_FAILURE 8
#define VIRTIO_SCSI_S_FAILURE 9
#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10
#define VIRTIO_SCSI_S_FUNCTION_REJECTED 11
#define VIRTIO_SCSI_S_INCORRECT_LUN 12
/* Controlq type codes. */
#define VIRTIO_SCSI_T_TMF 0
#define VIRTIO_SCSI_T_AN_QUERY 1
#define VIRTIO_SCSI_T_AN_SUBSCRIBE 2
/* Valid TMF subtypes. */
#define VIRTIO_SCSI_T_TMF_ABORT_TASK 0
#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1
#define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2
#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3
#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4
#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5
#define VIRTIO_SCSI_T_TMF_QUERY_TASK 6
#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7
/* Events. */
#define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000
#define VIRTIO_SCSI_T_NO_EVENT 0
#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
#define VIRTIO_SCSI_T_PARAM_CHANGE 3
/* Reasons for transport reset event */
#define VIRTIO_SCSI_EVT_RESET_HARD 0
#define VIRTIO_SCSI_EVT_RESET_RESCAN 1
#define VIRTIO_SCSI_EVT_RESET_REMOVED 2
/* SCSI command request, followed by CDB and data-out */
typedef struct {
uint8_t lun[8]; /* Logical Unit Number */
uint64_t tag; /* Command identifier */
uint8_t task_attr; /* Task attribute */
uint8_t prio;
uint8_t crn;
} QEMU_PACKED VirtIOSCSICmdReq;
/* Response, followed by sense data and data-in */
typedef struct {
uint32_t sense_len; /* Sense data length */
uint32_t resid; /* Residual bytes in data buffer */
uint16_t status_qualifier; /* Status qualifier */
uint8_t status; /* Command completion status */
uint8_t response; /* Response values */
} QEMU_PACKED VirtIOSCSICmdResp;
/* Task Management Request */
typedef struct {
uint32_t type;
uint32_t subtype;
uint8_t lun[8];
uint64_t tag;
} QEMU_PACKED VirtIOSCSICtrlTMFReq;
typedef struct {
uint8_t response;
} QEMU_PACKED VirtIOSCSICtrlTMFResp;
/* Asynchronous notification query/subscription */
typedef struct {
uint32_t type;
uint8_t lun[8];
uint32_t event_requested;
} QEMU_PACKED VirtIOSCSICtrlANReq;
typedef struct {
uint32_t event_actual;
uint8_t response;
} QEMU_PACKED VirtIOSCSICtrlANResp;
typedef struct {
uint32_t event;
uint8_t lun[8];
uint32_t reason;
} QEMU_PACKED VirtIOSCSIEvent;
typedef struct {
uint32_t num_queues;
uint32_t seg_max;
uint32_t max_sectors;
uint32_t cmd_per_lun;
uint32_t event_info_size;
uint32_t sense_size;
uint32_t cdb_size;
uint16_t max_channel;
uint16_t max_target;
uint32_t max_lun;
} QEMU_PACKED VirtIOSCSIConfig;
struct VirtIOSCSIConf {
uint32_t num_queues;
uint32_t max_sectors;
uint32_t cmd_per_lun;
char *vhostfd;
char *wwpn;
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 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 */
/* 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;
Notifier migration_state_notifier;
} VirtIOSCSI;
typedef struct VirtIOSCSIReq {
VirtIOSCSI *dev;
VirtQueue *vq;
QEMUSGList qsgl;
QEMUIOVector resp_iov;
/* Note:
* - fields before elem are initialized by virtio_scsi_init_req;
* - elem is uninitialized at the time of allocation.
* - fields after elem are zeroed by virtio_scsi_init_req.
* */
VirtQueueElement elem;
/* Set by dataplane code. */
VirtIOSCSIVring *vring;
/* Used for two-stage request submission */
QTAILQ_ENTRY(VirtIOSCSIReq) next;
SCSIRequest *sreq;
size_t resp_size;
enum SCSIXferMode mode;
union {
VirtIOSCSICmdResp cmd;
VirtIOSCSICtrlTMFResp tmf;
VirtIOSCSICtrlANResp an;
VirtIOSCSIEvent event;
} resp;
union {
struct {
VirtIOSCSICmdReq cmd;
uint8_t cdb[];
} QEMU_PACKED;
VirtIOSCSICtrlTMFReq tmf;
VirtIOSCSICtrlANReq an;
} req;
} VirtIOSCSIReq;
QEMU_BUILD_BUG_ON(offsetof(VirtIOSCSIReq, req.cdb) !=
offsetof(VirtIOSCSIReq, req.cmd) + sizeof(VirtIOSCSICmdReq));
#define DEFINE_VIRTIO_SCSI_PROPERTIES(_state, _conf_field) \
DEFINE_PROP_UINT32("num_queues", _state, _conf_field.num_queues, 1), \
DEFINE_PROP_UINT32("max_sectors", _state, _conf_field.max_sectors, 0xFFFF),\
DEFINE_PROP_UINT32("cmd_per_lun", _state, _conf_field.cmd_per_lun, 128)
#define DEFINE_VIRTIO_SCSI_FEATURES(_state, _feature_field) \
DEFINE_PROP_BIT("any_layout", _state, _feature_field, \
VIRTIO_F_ANY_LAYOUT, true), \
DEFINE_PROP_BIT("hotplug", _state, _feature_field, VIRTIO_SCSI_F_HOTPLUG, \
true), \
DEFINE_PROP_BIT("param_change", _state, _feature_field, \
VIRTIO_SCSI_F_CHANGE, true)
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);
VirtIOSCSIReq *virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq);
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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