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 "sysemu/iothread.h" 25 #include "hw/virtio/dataplane/vring.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_VQ_SIZE 128 36 #define VIRTIO_SCSI_MAX_CHANNEL 0 37 #define VIRTIO_SCSI_MAX_TARGET 255 38 #define VIRTIO_SCSI_MAX_LUN 16383 39 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; 48 49 struct VirtIOSCSIConf { 50 uint32_t num_queues; 51 uint32_t max_sectors; 52 uint32_t cmd_per_lun; 53 char *vhostfd; 54 char *wwpn; 55 uint32_t boot_tpgt; 56 IOThread *iothread; 57 }; 58 59 struct VirtIOSCSI; 60 61 typedef struct { 62 struct VirtIOSCSI *parent; 63 Vring vring; 64 EventNotifier host_notifier; 65 EventNotifier guest_notifier; 66 } VirtIOSCSIVring; 67 68 typedef struct VirtIOSCSICommon { 69 VirtIODevice parent_obj; 70 VirtIOSCSIConf conf; 71 72 uint32_t sense_size; 73 uint32_t cdb_size; 74 VirtQueue *ctrl_vq; 75 VirtQueue *event_vq; 76 VirtQueue **cmd_vqs; 77 } VirtIOSCSICommon; 78 79 typedef struct VirtIOSCSI { 80 VirtIOSCSICommon parent_obj; 81 82 SCSIBus bus; 83 int resetting; 84 bool events_dropped; 85 86 /* Fields for dataplane below */ 87 AioContext *ctx; /* one iothread per virtio-scsi-pci for now */ 88 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; 99 Error *blocker; 100 Notifier migration_state_notifier; 101 uint32_t host_features; 102 } VirtIOSCSI; 103 104 typedef struct VirtIOSCSIReq { 105 VirtIOSCSI *dev; 106 VirtQueue *vq; 107 QEMUSGList qsgl; 108 QEMUIOVector resp_iov; 109 110 /* Note: 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. 114 * */ 115 116 VirtQueueElement elem; 117 /* Set by dataplane code. */ 118 VirtIOSCSIVring *vring; 119 120 union { 121 /* Used for two-stage request submission */ 122 QTAILQ_ENTRY(VirtIOSCSIReq) next; 123 124 /* Used for cancellation of request during TMFs */ 125 int remaining; 126 }; 127 128 SCSIRequest *sreq; 129 size_t resp_size; 130 enum SCSIXferMode mode; 131 union { 132 VirtIOSCSICmdResp cmd; 133 VirtIOSCSICtrlTMFResp tmf; 134 VirtIOSCSICtrlANResp an; 135 VirtIOSCSIEvent event; 136 } resp; 137 union { 138 VirtIOSCSICmdReq cmd; 139 VirtIOSCSICtrlTMFReq tmf; 140 VirtIOSCSICtrlANReq an; 141 } req; 142 } VirtIOSCSIReq; 143 144 typedef void (*HandleOutput)(VirtIODevice *, VirtQueue *); 145 146 void virtio_scsi_common_realize(DeviceState *dev, Error **errp, 147 HandleOutput ctrl, HandleOutput evt, 148 HandleOutput cmd); 149 150 void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp); 151 void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req); 152 bool virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req); 153 void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req); 154 VirtIOSCSIReq *virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq); 155 void virtio_scsi_free_req(VirtIOSCSIReq *req); 156 void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, 157 uint32_t event, uint32_t reason); 158 159 void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread *iothread); 160 void virtio_scsi_dataplane_start(VirtIOSCSI *s); 161 void virtio_scsi_dataplane_stop(VirtIOSCSI *s); 162 void virtio_scsi_vring_push_notify(VirtIOSCSIReq *req); 163 VirtIOSCSIReq *virtio_scsi_pop_req_vring(VirtIOSCSI *s, 164 VirtIOSCSIVring *vring); 165 166 #endif /* _QEMU_VIRTIO_SCSI_H */ 167