/* * Virtio SCSI HBA * * Copyright IBM, Corp. 2010 * * Authors: * Stefan Hajnoczi * * 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; 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 { 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 */