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 "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 static inline void virtio_scsi_acquire(VirtIOSCSI *s)
 125 {
 126     if (s->ctx) {
 127         aio_context_acquire(s->ctx);
 128     }
 129 }
 130
 131 static inline void virtio_scsi_release(VirtIOSCSI *s)
 132 {
 133     if (s->ctx) {
 134         aio_context_release(s->ctx);
 135     }
 136 }
 137
 138 void virtio_scsi_common_realize(DeviceState *dev,
 139                                 VirtIOHandleOutput ctrl,
 140                                 VirtIOHandleOutput evt,
 141                                 VirtIOHandleOutput cmd,
 142                                 Error **errp);
 143
 144 void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp);
 145 bool virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq);
 146 bool virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq);
 147 bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq);
 148 void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req);
 149 void virtio_scsi_free_req(VirtIOSCSIReq *req);
 150 void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
 151                             uint32_t event, uint32_t reason);
 152
 153 void virtio_scsi_dataplane_setup(VirtIOSCSI *s, Error **errp);
 154 int virtio_scsi_dataplane_start(VirtIODevice *s);
 155 void virtio_scsi_dataplane_stop(VirtIODevice *s);
 156
 157 #endif /* QEMU_VIRTIO_SCSI_H */