qdev/scsi: add scsi bus support to qdev, convert drivers.

* Add SCSIBus.
 * Add SCSIDeviceInfo, move device callbacks here.
 * add qdev/scsi helper functions.
 * convert drivers.

Adding scsi disks via -device works now, i.e. you can do:

 -drive id=sda,if=none,...
 -device lsi
 -device scsi-disk,drive=sda

legacy command lines (-drive if=scsi,...) continue to work.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
new file mode 100644
index 0000000..16afa05
--- /dev/null
+++ b/hw/scsi-bus.c
@@ -0,0 +1,93 @@
+#include "hw.h"
+#include "sysemu.h"
+#include "scsi-disk.h"
+#include "block.h"
+#include "qdev.h"
+
+static struct BusInfo scsi_bus_info = {
+    .name  = "SCSI",
+    .size  = sizeof(SCSIBus),
+    .props = (Property[]) {
+        DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+static int next_scsi_bus;
+
+/* Create a scsi bus, and attach devices to it.  */
+SCSIBus *scsi_bus_new(DeviceState *host, int tcq, int ndev,
+                      scsi_completionfn complete)
+{
+    SCSIBus *bus;
+
+    bus = FROM_QBUS(SCSIBus, qbus_create(&scsi_bus_info, host, NULL));
+    bus->busnr = next_scsi_bus++;
+    bus->tcq = tcq;
+    bus->ndev = ndev;
+    bus->complete = complete;
+    return bus;
+}
+
+static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
+{
+    SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
+    SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
+    SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
+
+    if (dev->id == -1) {
+        for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
+            if (bus->devs[dev->id] == NULL)
+                break;
+        }
+    }
+    if (dev->id >= bus->ndev) {
+        qemu_error("bad scsi device id: %d\n", dev->id);
+        goto err;
+    }
+
+    if (bus->devs[dev->id]) {
+        bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
+    }
+    bus->devs[dev->id] = dev;
+
+    dev->info = info;
+    return dev->info->init(dev);
+
+err:
+    return -1;
+}
+
+void scsi_qdev_register(SCSIDeviceInfo *info)
+{
+    info->qdev.bus_info = &scsi_bus_info;
+    info->qdev.init     = scsi_qdev_init;
+    qdev_register(&info->qdev);
+}
+
+/* handle legacy '-drive if=scsi,...' cmd line args */
+SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, DriveInfo *dinfo, int unit)
+{
+    const char *driver;
+    DeviceState *dev;
+
+    driver = bdrv_is_sg(dinfo->bdrv) ? "scsi-generic" : "scsi-disk";
+    dev = qdev_create(&bus->qbus, driver);
+    qdev_prop_set_uint32(dev, "scsi-id", unit);
+    qdev_prop_set_drive(dev, "drive", dinfo);
+    qdev_init(dev);
+    return DO_UPCAST(SCSIDevice, qdev, dev);
+}
+
+void scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
+{
+    DriveInfo *dinfo;
+    int unit;
+
+    for (unit = 0; unit < MAX_SCSI_DEVS; unit++) {
+        dinfo = drive_get(IF_SCSI, bus->busnr, unit);
+        if (dinfo == NULL) {
+            continue;
+        }
+        scsi_bus_legacy_add_drive(bus, dinfo, unit);
+    }
+}