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 }
  27
  28 static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
  29 {
  30     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  31     SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
  32     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  33     int rc = -1;
  34
  35     if (dev->id == -1) {
  36         for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
  37             if (bus->devs[dev->id] == NULL)
  38                 break;
  39         }
  40     }
  41     if (dev->id >= bus->ndev) {
  42         qemu_error("bad scsi device id: %d\n", dev->id);
  43         goto err;
  44     }
  45
  46     if (bus->devs[dev->id]) {
  47         qdev_free(&bus->devs[dev->id]->qdev);
  48     }
  49     bus->devs[dev->id] = dev;
  50
  51     dev->info = info;
  52     rc = dev->info->init(dev);
  53     if (rc != 0) {
  54         bus->devs[dev->id] = NULL;
  55     }
  56
  57 err:
  58     return rc;
  59 }
  60
  61 static int scsi_qdev_exit(DeviceState *qdev)
  62 {
  63     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  64     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  65
  66     assert(bus->devs[dev->id] != NULL);
  67     if (bus->devs[dev->id]->info->destroy) {
  68         bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
  69     }
  70     bus->devs[dev->id] = NULL;
  71     return 0;
  72 }
  73
  74 void scsi_qdev_register(SCSIDeviceInfo *info)
  75 {
  76     info->qdev.bus_info = &scsi_bus_info;
  77     info->qdev.init     = scsi_qdev_init;
  78     info->qdev.exit     = scsi_qdev_exit;
  79     qdev_register(&info->qdev);
  80 }
  81
  82 /* handle legacy '-drive if=scsi,...' cmd line args */
  83 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, DriveInfo *dinfo, int unit)
  84 {
  85     const char *driver;
  86     DeviceState *dev;
  87
  88     driver = bdrv_is_sg(dinfo->bdrv) ? "scsi-generic" : "scsi-disk";
  89     dev = qdev_create(&bus->qbus, driver);
  90     qdev_prop_set_uint32(dev, "scsi-id", unit);
  91     qdev_prop_set_drive(dev, "drive", dinfo);
  92     qdev_init(dev);
  93     return DO_UPCAST(SCSIDevice, qdev, dev);
  94 }
  95
  96 void scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
  97 {
  98     DriveInfo *dinfo;
  99     int unit;
 100
 101     for (unit = 0; unit < MAX_SCSI_DEVS; unit++) {
 102         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
 103         if (dinfo == NULL) {
 104             continue;
 105         }
 106         scsi_bus_legacy_add_drive(bus, dinfo, unit);
 107     }
 108 }