4 * Copyright IBM, Corp. 2010
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef _QEMU_VIRTIO_SCSI_H
15 #define _QEMU_VIRTIO_SCSI_H
17 /* Override CDB/sense data size: they are dynamic (guest controlled) in QEMU */
18 #define VIRTIO_SCSI_CDB_SIZE 0
19 #define VIRTIO_SCSI_SENSE_SIZE 0
20 #include "standard-headers/linux/virtio_scsi.h"
21 #include "hw/virtio/virtio.h"
22 #include "hw/pci/pci.h"
23 #include "hw/scsi/scsi.h"
24 #include "sysemu/iothread.h"
25 #include "hw/virtio/dataplane/vring.h"
27 #define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common"
28 #define VIRTIO_SCSI_COMMON(obj) \
29 OBJECT_CHECK(VirtIOSCSICommon, (obj), TYPE_VIRTIO_SCSI_COMMON)
31 #define TYPE_VIRTIO_SCSI "virtio-scsi-device"
32 #define VIRTIO_SCSI(obj) \
33 OBJECT_CHECK(VirtIOSCSI, (obj), TYPE_VIRTIO_SCSI)
35 #define VIRTIO_SCSI_VQ_SIZE 128
36 #define VIRTIO_SCSI_MAX_CHANNEL 0
37 #define VIRTIO_SCSI_MAX_TARGET 255
38 #define VIRTIO_SCSI_MAX_LUN 16383
40 typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq;
41 typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp;
42 typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq;
43 typedef struct virtio_scsi_ctrl_tmf_resp VirtIOSCSICtrlTMFResp;
44 typedef struct virtio_scsi_ctrl_an_req VirtIOSCSICtrlANReq;
45 typedef struct virtio_scsi_ctrl_an_resp VirtIOSCSICtrlANResp;
46 typedef struct virtio_scsi_event VirtIOSCSIEvent;
47 typedef struct virtio_scsi_config VirtIOSCSIConfig;
49 struct VirtIOSCSIConf {
62 struct VirtIOSCSI *parent;
64 EventNotifier host_notifier;
65 EventNotifier guest_notifier;
68 typedef struct VirtIOSCSICommon {
69 VirtIODevice parent_obj;
79 typedef struct VirtIOSCSI {
80 VirtIOSCSICommon parent_obj;
86 /* Fields for dataplane below */
87 AioContext *ctx; /* one iothread per virtio-scsi-pci for now */
89 /* Vring is used instead of vq in dataplane code, because of the underlying
90 * memory layer thread safety */
91 VirtIOSCSIVring *ctrl_vring;
92 VirtIOSCSIVring *event_vring;
93 VirtIOSCSIVring **cmd_vrings;
94 bool dataplane_started;
95 bool dataplane_starting;
96 bool dataplane_stopping;
97 bool dataplane_disabled;
98 bool dataplane_fenced;
100 Notifier migration_state_notifier;
101 uint32_t host_features;
104 typedef struct VirtIOSCSIReq {
108 QEMUIOVector resp_iov;
111 * - fields before elem are initialized by virtio_scsi_init_req;
112 * - elem is uninitialized at the time of allocation.
113 * - fields after elem are zeroed by virtio_scsi_init_req.
116 VirtQueueElement elem;
117 /* Set by dataplane code. */
118 VirtIOSCSIVring *vring;
121 /* Used for two-stage request submission */
122 QTAILQ_ENTRY(VirtIOSCSIReq) next;
124 /* Used for cancellation of request during TMFs */
130 enum SCSIXferMode mode;
132 VirtIOSCSICmdResp cmd;
133 VirtIOSCSICtrlTMFResp tmf;
134 VirtIOSCSICtrlANResp an;
135 VirtIOSCSIEvent event;
138 VirtIOSCSICmdReq cmd;
139 VirtIOSCSICtrlTMFReq tmf;
140 VirtIOSCSICtrlANReq an;
144 #define DEFINE_VIRTIO_SCSI_PROPERTIES(_state, _conf_field) \
145 DEFINE_PROP_UINT32("num_queues", _state, _conf_field.num_queues, 1), \
146 DEFINE_PROP_UINT32("max_sectors", _state, _conf_field.max_sectors, 0xFFFF),\
147 DEFINE_PROP_UINT32("cmd_per_lun", _state, _conf_field.cmd_per_lun, 128)
149 #define DEFINE_VIRTIO_SCSI_FEATURES(_state, _feature_field) \
150 DEFINE_PROP_BIT("any_layout", _state, _feature_field, \
151 VIRTIO_F_ANY_LAYOUT, true), \
152 DEFINE_PROP_BIT("hotplug", _state, _feature_field, VIRTIO_SCSI_F_HOTPLUG, \
154 DEFINE_PROP_BIT("param_change", _state, _feature_field, \
155 VIRTIO_SCSI_F_CHANGE, true)
157 typedef void (*HandleOutput)(VirtIODevice *, VirtQueue *);
159 void virtio_scsi_common_realize(DeviceState *dev, Error **errp,
160 HandleOutput ctrl, HandleOutput evt,
163 void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp);
164 void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req);
165 bool virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req);
166 void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req);
167 VirtIOSCSIReq *virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq);
168 void virtio_scsi_free_req(VirtIOSCSIReq *req);
169 void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
170 uint32_t event, uint32_t reason);
172 void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread *iothread);
173 void virtio_scsi_dataplane_start(VirtIOSCSI *s);
174 void virtio_scsi_dataplane_stop(VirtIOSCSI *s);
175 void virtio_scsi_vring_push_notify(VirtIOSCSIReq *req);
176 VirtIOSCSIReq *virtio_scsi_pop_req_vring(VirtIOSCSI *s,
177 VirtIOSCSIVring *vring);
179 #endif /* _QEMU_VIRTIO_SCSI_H */