hw/scsi-bus.c

   1 #include "hw.h"
   2 #include "sysemu.h"
   3 #include "scsi-disk.h"
   4 #include "block.h"
   5 #include "qdev.h"
   6
   7 static struct BusInfo scsi_bus_info = {
   8     .name  = "SCSI",
   9     .size  = sizeof(SCSIBus),
  10     .props = (Property[]) {
  11         DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
  12         DEFINE_PROP_END_OF_LIST(),
  13     },
  14 };
  15 static int next_scsi_bus;
  16
  17 /* Create a scsi bus, and attach devices to it.  */
  18 void scsi_bus_new(SCSIBus *bus, DeviceState *host, int tcq, int ndev,
  19                   scsi_completionfn complete)
  20 {
  21     qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
  22     bus->busnr = next_scsi_bus++;
  23     bus->tcq = tcq;
  24     bus->ndev = ndev;
  25     bus->complete = complete;
  26     bus->qbus.allow_hotplug = 1;
  27 }
  28
  29 static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
  30 {
  31     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  32     SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
  33     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  34     int rc = -1;
  35
  36     if (dev->id == -1) {
  37         for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
  38             if (bus->devs[dev->id] == NULL)
  39                 break;
  40         }
  41     }
  42     if (dev->id >= bus->ndev) {
  43         qemu_error("bad scsi device id: %d\n", dev->id);
  44         goto err;
  45     }
  46
  47     if (bus->devs[dev->id]) {
  48         qdev_free(&bus->devs[dev->id]->qdev);
  49     }
  50     bus->devs[dev->id] = dev;
  51
  52     dev->info = info;
  53     rc = dev->info->init(dev);
  54     if (rc != 0) {
  55         bus->devs[dev->id] = NULL;
  56     }
  57
  58 err:
  59     return rc;
  60 }
  61
  62 static int scsi_qdev_exit(DeviceState *qdev)
  63 {
  64     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  65     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  66
  67     assert(bus->devs[dev->id] != NULL);
  68     if (bus->devs[dev->id]->info->destroy) {
  69         bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
  70     }
  71     bus->devs[dev->id] = NULL;
  72     return 0;
  73 }
  74
  75 void scsi_qdev_register(SCSIDeviceInfo *info)
  76 {
  77     info->qdev.bus_info = &scsi_bus_info;
  78     info->qdev.init     = scsi_qdev_init;
  79     info->qdev.unplug   = qdev_simple_unplug_cb;
  80     info->qdev.exit     = scsi_qdev_exit;
  81     qdev_register(&info->qdev);
  82 }
  83
  84 /* handle legacy '-drive if=scsi,...' cmd line args */
  85 /* FIXME callers should check for failure, but don't */
  86 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, DriveInfo *dinfo, int unit)
  87 {
  88     const char *driver;
  89     DeviceState *dev;
  90
  91     driver = bdrv_is_sg(dinfo->bdrv) ? "scsi-generic" : "scsi-disk";
  92     dev = qdev_create(&bus->qbus, driver);
  93     qdev_prop_set_uint32(dev, "scsi-id", unit);
  94     qdev_prop_set_drive(dev, "drive", dinfo);
  95     if (qdev_init(dev) < 0)
  96         return NULL;
  97     return DO_UPCAST(SCSIDevice, qdev, dev);
  98 }
  99
 100 void scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
 101 {
 102     DriveInfo *dinfo;
 103     int unit;
 104
 105     for (unit = 0; unit < MAX_SCSI_DEVS; unit++) {
 106         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
 107         if (dinfo == NULL) {
 108             continue;
 109         }
 110         scsi_bus_legacy_add_drive(bus, dinfo, unit);
 111     }
 112 }