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 #include "qom/object.h" 17 18 /* Override CDB/sense data size: they are dynamic (guest controlled) in QEMU */ 19 #define VIRTIO_SCSI_CDB_SIZE 0 20 #define VIRTIO_SCSI_SENSE_SIZE 0 21 #include "standard-headers/linux/virtio_scsi.h" 22 #include "hw/virtio/virtio.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 OBJECT_DECLARE_SIMPLE_TYPE(VirtIOSCSICommon, VIRTIO_SCSI_COMMON) 29 30 #define TYPE_VIRTIO_SCSI "virtio-scsi-device" 31 OBJECT_DECLARE_SIMPLE_TYPE(VirtIOSCSI, VIRTIO_SCSI) 32 33 #define VIRTIO_SCSI_MAX_CHANNEL 0 34 #define VIRTIO_SCSI_MAX_TARGET 255 35 #define VIRTIO_SCSI_MAX_LUN 16383 36 37 /* Number of virtqueues that are always present */ 38 #define VIRTIO_SCSI_VQ_NUM_FIXED 2 39 40 #define VIRTIO_SCSI_AUTO_NUM_QUEUES UINT32_MAX 41 42 typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq; 43 typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp; 44 typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq; 45 typedef struct virtio_scsi_ctrl_tmf_resp VirtIOSCSICtrlTMFResp; 46 typedef struct virtio_scsi_ctrl_an_req VirtIOSCSICtrlANReq; 47 typedef struct virtio_scsi_ctrl_an_resp VirtIOSCSICtrlANResp; 48 typedef struct virtio_scsi_event VirtIOSCSIEvent; 49 typedef struct virtio_scsi_config VirtIOSCSIConfig; 50 51 struct VirtIOSCSIConf { 52 uint32_t num_queues; 53 uint32_t virtqueue_size; 54 bool seg_max_adjust; 55 uint32_t max_sectors; 56 uint32_t cmd_per_lun; 57 char *vhostfd; 58 char *wwpn; 59 CharBackend chardev; 60 uint32_t boot_tpgt; 61 IOThread *iothread; 62 }; 63 64 struct VirtIOSCSI; 65 66 struct VirtIOSCSICommon { 67 VirtIODevice parent_obj; 68 VirtIOSCSIConf conf; 69 70 uint32_t sense_size; 71 uint32_t cdb_size; 72 VirtQueue *ctrl_vq; 73 VirtQueue *event_vq; 74 VirtQueue **cmd_vqs; 75 }; 76 77 struct VirtIOSCSIReq; 78 79 struct VirtIOSCSI { 80 VirtIOSCSICommon parent_obj; 81 82 SCSIBus bus; 83 int resetting; /* written from main loop thread, read from any thread */ 84 bool events_dropped; 85 86 /* 87 * TMFs deferred to main loop BH. These fields are protected by 88 * virtio_scsi_acquire(). 89 */ 90 QEMUBH *tmf_bh; 91 QTAILQ_HEAD(, VirtIOSCSIReq) tmf_bh_list; 92 93 /* Fields for dataplane below */ 94 AioContext *ctx; /* one iothread per virtio-scsi-pci for now */ 95 96 bool dataplane_started; 97 bool dataplane_starting; 98 bool dataplane_stopping; 99 bool dataplane_fenced; 100 uint32_t host_features; 101 }; 102 103 static inline void virtio_scsi_acquire(VirtIOSCSI *s) 104 { 105 if (s->ctx) { 106 aio_context_acquire(s->ctx); 107 } 108 } 109 110 static inline void virtio_scsi_release(VirtIOSCSI *s) 111 { 112 if (s->ctx) { 113 aio_context_release(s->ctx); 114 } 115 } 116 117 void virtio_scsi_common_realize(DeviceState *dev, 118 VirtIOHandleOutput ctrl, 119 VirtIOHandleOutput evt, 120 VirtIOHandleOutput cmd, 121 Error **errp); 122 123 void virtio_scsi_common_unrealize(DeviceState *dev); 124 125 void virtio_scsi_dataplane_setup(VirtIOSCSI *s, Error **errp); 126 int virtio_scsi_dataplane_start(VirtIODevice *s); 127 void virtio_scsi_dataplane_stop(VirtIODevice *s); 128 129 #endif /* QEMU_VIRTIO_SCSI_H */ 130