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 26 #define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common" 27 #define VIRTIO_SCSI_COMMON(obj) \ 28 OBJECT_CHECK(VirtIOSCSICommon, (obj), TYPE_VIRTIO_SCSI_COMMON) 29 30 #define TYPE_VIRTIO_SCSI "virtio-scsi-device" 31 #define VIRTIO_SCSI(obj) \ 32 OBJECT_CHECK(VirtIOSCSI, (obj), TYPE_VIRTIO_SCSI) 33 34 #define VIRTIO_SCSI_VQ_SIZE 128 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 max_sectors; 51 uint32_t cmd_per_lun; 52 char *vhostfd; 53 char *wwpn; 54 uint32_t boot_tpgt; 55 IOThread *iothread; 56 }; 57 58 struct VirtIOSCSI; 59 60 typedef struct VirtIOSCSICommon { 61 VirtIODevice parent_obj; 62 VirtIOSCSIConf conf; 63 64 uint32_t sense_size; 65 uint32_t cdb_size; 66 VirtQueue *ctrl_vq; 67 VirtQueue *event_vq; 68 VirtQueue **cmd_vqs; 69 } VirtIOSCSICommon; 70 71 typedef struct VirtIOSCSI { 72 VirtIOSCSICommon parent_obj; 73 74 SCSIBus bus; 75 int resetting; 76 bool events_dropped; 77 78 /* Fields for dataplane below */ 79 AioContext *ctx; /* one iothread per virtio-scsi-pci for now */ 80 81 bool dataplane_started; 82 bool dataplane_starting; 83 bool dataplane_stopping; 84 bool dataplane_fenced; 85 uint32_t host_features; 86 } VirtIOSCSI; 87 88 typedef struct VirtIOSCSIReq { 89 /* Note: 90 * - fields up to resp_iov are initialized by virtio_scsi_init_req; 91 * - fields starting at vring are zeroed by virtio_scsi_init_req. 92 * */ 93 VirtQueueElement elem; 94 95 VirtIOSCSI *dev; 96 VirtQueue *vq; 97 QEMUSGList qsgl; 98 QEMUIOVector resp_iov; 99 100 union { 101 /* Used for two-stage request submission */ 102 QTAILQ_ENTRY(VirtIOSCSIReq) next; 103 104 /* Used for cancellation of request during TMFs */ 105 int remaining; 106 }; 107 108 SCSIRequest *sreq; 109 size_t resp_size; 110 enum SCSIXferMode mode; 111 union { 112 VirtIOSCSICmdResp cmd; 113 VirtIOSCSICtrlTMFResp tmf; 114 VirtIOSCSICtrlANResp an; 115 VirtIOSCSIEvent event; 116 } resp; 117 union { 118 VirtIOSCSICmdReq cmd; 119 VirtIOSCSICtrlTMFReq tmf; 120 VirtIOSCSICtrlANReq an; 121 } req; 122 } VirtIOSCSIReq; 123 124 typedef void (*HandleOutput)(VirtIODevice *, VirtQueue *); 125 126 void virtio_scsi_common_realize(DeviceState *dev, Error **errp, 127 HandleOutput ctrl, HandleOutput evt, 128 HandleOutput cmd); 129 130 void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp); 131 void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq); 132 void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq); 133 void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq); 134 void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req); 135 void virtio_scsi_free_req(VirtIOSCSIReq *req); 136 void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, 137 uint32_t event, uint32_t reason); 138 139 void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread *iothread); 140 void virtio_scsi_dataplane_start(VirtIOSCSI *s); 141 void virtio_scsi_dataplane_stop(VirtIOSCSI *s); 142 void virtio_scsi_dataplane_notify(VirtIODevice *vdev, VirtIOSCSIReq *req); 143 144 #endif /* _QEMU_VIRTIO_SCSI_H */ 145