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virtio-scsi.h (3206B)

      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/pci/pci.h"
     24 #include "hw/scsi/scsi.h"
     25 #include "chardev/char-fe.h"
     26 #include "sysemu/iothread.h"
     27 
     28 #define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common"
     29 OBJECT_DECLARE_SIMPLE_TYPE(VirtIOSCSICommon, VIRTIO_SCSI_COMMON)
     30 
     31 #define TYPE_VIRTIO_SCSI "virtio-scsi-device"
     32 OBJECT_DECLARE_SIMPLE_TYPE(VirtIOSCSI, VIRTIO_SCSI)
     33 
     34 #define VIRTIO_SCSI_MAX_CHANNEL 0
     35 #define VIRTIO_SCSI_MAX_TARGET  255
     36 #define VIRTIO_SCSI_MAX_LUN     16383
     37 
     38 /* Number of virtqueues that are always present */
     39 #define VIRTIO_SCSI_VQ_NUM_FIXED    2
     40 
     41 #define VIRTIO_SCSI_AUTO_NUM_QUEUES UINT32_MAX
     42 
     43 typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq;
     44 typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp;
     45 typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq;
     46 typedef struct virtio_scsi_ctrl_tmf_resp VirtIOSCSICtrlTMFResp;
     47 typedef struct virtio_scsi_ctrl_an_req VirtIOSCSICtrlANReq;
     48 typedef struct virtio_scsi_ctrl_an_resp VirtIOSCSICtrlANResp;
     49 typedef struct virtio_scsi_event VirtIOSCSIEvent;
     50 typedef struct virtio_scsi_config VirtIOSCSIConfig;
     51 
     52 struct VirtIOSCSIConf {
     53     uint32_t num_queues;
     54     uint32_t virtqueue_size;
     55     bool seg_max_adjust;
     56     uint32_t max_sectors;
     57     uint32_t cmd_per_lun;
     58     char *vhostfd;
     59     char *wwpn;
     60     CharBackend chardev;
     61     uint32_t boot_tpgt;
     62     IOThread *iothread;
     63 };
     64 
     65 struct VirtIOSCSI;
     66 
     67 struct VirtIOSCSICommon {
     68     VirtIODevice parent_obj;
     69     VirtIOSCSIConf conf;
     70 
     71     uint32_t sense_size;
     72     uint32_t cdb_size;
     73     VirtQueue *ctrl_vq;
     74     VirtQueue *event_vq;
     75     VirtQueue **cmd_vqs;
     76 };
     77 
     78 struct VirtIOSCSI {
     79     VirtIOSCSICommon parent_obj;
     80 
     81     SCSIBus bus;
     82     int resetting;
     83     bool events_dropped;
     84 
     85     /* Fields for dataplane below */
     86     AioContext *ctx; /* one iothread per virtio-scsi-pci for now */
     87 
     88     bool dataplane_started;
     89     bool dataplane_starting;
     90     bool dataplane_stopping;
     91     bool dataplane_fenced;
     92     uint32_t host_features;
     93 };
     94 
     95 static inline void virtio_scsi_acquire(VirtIOSCSI *s)
     96 {
     97     if (s->ctx) {
     98         aio_context_acquire(s->ctx);
     99     }
    100 }
    101 
    102 static inline void virtio_scsi_release(VirtIOSCSI *s)
    103 {
    104     if (s->ctx) {
    105         aio_context_release(s->ctx);
    106     }
    107 }
    108 
    109 void virtio_scsi_common_realize(DeviceState *dev,
    110                                 VirtIOHandleOutput ctrl,
    111                                 VirtIOHandleOutput evt,
    112                                 VirtIOHandleOutput cmd,
    113                                 Error **errp);
    114 
    115 void virtio_scsi_common_unrealize(DeviceState *dev);
    116 
    117 void virtio_scsi_dataplane_setup(VirtIOSCSI *s, Error **errp);
    118 int virtio_scsi_dataplane_start(VirtIODevice *s);
    119 void virtio_scsi_dataplane_stop(VirtIODevice *s);
    120 
    121 #endif /* QEMU_VIRTIO_SCSI_H */