hw/intc/armv7m_nvic: Provide default "reset the system" behaviour for SYSRESETREQ
[qemu.git] / include / hw / virtio / virtio-scsi.h
1 /*
2 * Virtio SCSI HBA
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14 #ifndef QEMU_VIRTIO_SCSI_H
15 #define QEMU_VIRTIO_SCSI_H
16
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 "chardev/char-fe.h"
25 #include "sysemu/iothread.h"
26
27 #define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common"
28 #define VIRTIO_SCSI_COMMON(obj) \
29 OBJECT_CHECK(VirtIOSCSICommon, (obj), TYPE_VIRTIO_SCSI_COMMON)
30
31 #define TYPE_VIRTIO_SCSI "virtio-scsi-device"
32 #define VIRTIO_SCSI(obj) \
33 OBJECT_CHECK(VirtIOSCSI, (obj), TYPE_VIRTIO_SCSI)
34
35 #define VIRTIO_SCSI_MAX_CHANNEL 0
36 #define VIRTIO_SCSI_MAX_TARGET 255
37 #define VIRTIO_SCSI_MAX_LUN 16383
38
39 typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq;
40 typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp;
41 typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq;
42 typedef struct virtio_scsi_ctrl_tmf_resp VirtIOSCSICtrlTMFResp;
43 typedef struct virtio_scsi_ctrl_an_req VirtIOSCSICtrlANReq;
44 typedef struct virtio_scsi_ctrl_an_resp VirtIOSCSICtrlANResp;
45 typedef struct virtio_scsi_event VirtIOSCSIEvent;
46 typedef struct virtio_scsi_config VirtIOSCSIConfig;
47
48 struct VirtIOSCSIConf {
49 uint32_t num_queues;
50 uint32_t virtqueue_size;
51 bool seg_max_adjust;
52 uint32_t max_sectors;
53 uint32_t cmd_per_lun;
54 #ifdef CONFIG_VHOST_SCSI
55 char *vhostfd;
56 char *wwpn;
57 #endif
58 CharBackend chardev;
59 uint32_t boot_tpgt;
60 IOThread *iothread;
61 };
62
63 struct VirtIOSCSI;
64
65 typedef struct VirtIOSCSICommon {
66 VirtIODevice parent_obj;
67 VirtIOSCSIConf conf;
68
69 uint32_t sense_size;
70 uint32_t cdb_size;
71 VirtQueue *ctrl_vq;
72 VirtQueue *event_vq;
73 VirtQueue **cmd_vqs;
74 } VirtIOSCSICommon;
75
76 typedef struct VirtIOSCSI {
77 VirtIOSCSICommon parent_obj;
78
79 SCSIBus bus;
80 int resetting;
81 bool events_dropped;
82
83 /* Fields for dataplane below */
84 AioContext *ctx; /* one iothread per virtio-scsi-pci for now */
85
86 bool dataplane_started;
87 bool dataplane_starting;
88 bool dataplane_stopping;
89 bool dataplane_fenced;
90 uint32_t host_features;
91 } VirtIOSCSI;
92
93 typedef struct VirtIOSCSIReq {
94 /* Note:
95 * - fields up to resp_iov are initialized by virtio_scsi_init_req;
96 * - fields starting at vring are zeroed by virtio_scsi_init_req.
97 * */
98 VirtQueueElement elem;
99
100 VirtIOSCSI *dev;
101 VirtQueue *vq;
102 QEMUSGList qsgl;
103 QEMUIOVector resp_iov;
104
105 union {
106 /* Used for two-stage request submission */
107 QTAILQ_ENTRY(VirtIOSCSIReq) next;
108
109 /* Used for cancellation of request during TMFs */
110 int remaining;
111 };
112
113 SCSIRequest *sreq;
114 size_t resp_size;
115 enum SCSIXferMode mode;
116 union {
117 VirtIOSCSICmdResp cmd;
118 VirtIOSCSICtrlTMFResp tmf;
119 VirtIOSCSICtrlANResp an;
120 VirtIOSCSIEvent event;
121 } resp;
122 union {
123 VirtIOSCSICmdReq cmd;
124 VirtIOSCSICtrlTMFReq tmf;
125 VirtIOSCSICtrlANReq an;
126 } req;
127 } VirtIOSCSIReq;
128
129 static inline void virtio_scsi_acquire(VirtIOSCSI *s)
130 {
131 if (s->ctx) {
132 aio_context_acquire(s->ctx);
133 }
134 }
135
136 static inline void virtio_scsi_release(VirtIOSCSI *s)
137 {
138 if (s->ctx) {
139 aio_context_release(s->ctx);
140 }
141 }
142
143 void virtio_scsi_common_realize(DeviceState *dev,
144 VirtIOHandleOutput ctrl,
145 VirtIOHandleOutput evt,
146 VirtIOHandleOutput cmd,
147 Error **errp);
148
149 void virtio_scsi_common_unrealize(DeviceState *dev);
150 bool virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq);
151 bool virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq);
152 bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq);
153 void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req);
154 void virtio_scsi_free_req(VirtIOSCSIReq *req);
155 void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
156 uint32_t event, uint32_t reason);
157
158 void virtio_scsi_dataplane_setup(VirtIOSCSI *s, Error **errp);
159 int virtio_scsi_dataplane_start(VirtIODevice *s);
160 void virtio_scsi_dataplane_stop(VirtIODevice *s);
161
162 #endif /* QEMU_VIRTIO_SCSI_H */