Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 367 insertions, 0 deletions

diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
new file mode 100644
index 000000000..05c1da3d3
--- /dev/null
+++ b/hw/core/sysbus.c
@@ -0,0 +1,367 @@
+/*
+ *  System (CPU) Bus device support code
+ *
+ *  Copyright (c) 2009 CodeSourcery
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/module.h"
+#include "hw/sysbus.h"
+#include "monitor/monitor.h"
+#include "exec/address-spaces.h"
+
+static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent);
+static char *sysbus_get_fw_dev_path(DeviceState *dev);
+
+typedef struct SysBusFind {
+    void *opaque;
+    FindSysbusDeviceFunc *func;
+} SysBusFind;
+
+/* Run func() for every sysbus device, traverse the tree for everything else */
+static int find_sysbus_device(Object *obj, void *opaque)
+{
+    SysBusFind *find = opaque;
+    Object *dev;
+    SysBusDevice *sbdev;
+
+    dev = object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE);
+    sbdev = (SysBusDevice *)dev;
+
+    if (!sbdev) {
+        /* Container, traverse it for children */
+        return object_child_foreach(obj, find_sysbus_device, opaque);
+    }
+
+    find->func(sbdev, find->opaque);
+
+    return 0;
+}
+
+/*
+ * Loop through all dynamically created sysbus devices and call
+ * func() for each instance.
+ */
+void foreach_dynamic_sysbus_device(FindSysbusDeviceFunc *func, void *opaque)
+{
+    Object *container;
+    SysBusFind find = {
+        .func = func,
+        .opaque = opaque,
+    };
+
+    /* Loop through all sysbus devices that were spawned outside the machine */
+    container = container_get(qdev_get_machine(), "/peripheral");
+    find_sysbus_device(container, &find);
+    container = container_get(qdev_get_machine(), "/peripheral-anon");
+    find_sysbus_device(container, &find);
+}
+
+
+static void system_bus_class_init(ObjectClass *klass, void *data)
+{
+    BusClass *k = BUS_CLASS(klass);
+
+    k->print_dev = sysbus_dev_print;
+    k->get_fw_dev_path = sysbus_get_fw_dev_path;
+}
+
+static const TypeInfo system_bus_info = {
+    .name = TYPE_SYSTEM_BUS,
+    .parent = TYPE_BUS,
+    .instance_size = sizeof(BusState),
+    .class_init = system_bus_class_init,
+};
+
+/* Check whether an IRQ source exists */
+bool sysbus_has_irq(SysBusDevice *dev, int n)
+{
+    char *prop = g_strdup_printf("%s[%d]", SYSBUS_DEVICE_GPIO_IRQ, n);
+    ObjectProperty *r;
+
+    r = object_property_find(OBJECT(dev), prop);
+    g_free(prop);
+
+    return (r != NULL);
+}
+
+bool sysbus_is_irq_connected(SysBusDevice *dev, int n)
+{
+    return !!sysbus_get_connected_irq(dev, n);
+}
+
+qemu_irq sysbus_get_connected_irq(SysBusDevice *dev, int n)
+{
+    DeviceState *d = DEVICE(dev);
+    return qdev_get_gpio_out_connector(d, SYSBUS_DEVICE_GPIO_IRQ, n);
+}
+
+void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
+{
+    SysBusDeviceClass *sbd = SYS_BUS_DEVICE_GET_CLASS(dev);
+
+    qdev_connect_gpio_out_named(DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ, n, irq);
+
+    if (sbd->connect_irq_notifier) {
+        sbd->connect_irq_notifier(dev, irq);
+    }
+}
+
+/* Check whether an MMIO region exists */
+bool sysbus_has_mmio(SysBusDevice *dev, unsigned int n)
+{
+    return (n < dev->num_mmio);
+}
+
+static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
+                                   bool may_overlap, int priority)
+{
+    assert(n >= 0 && n < dev->num_mmio);
+
+    if (dev->mmio[n].addr == addr) {
+        /* ??? region already mapped here.  */
+        return;
+    }
+    if (dev->mmio[n].addr != (hwaddr)-1) {
+        /* Unregister previous mapping.  */
+        memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
+    }
+    dev->mmio[n].addr = addr;
+    if (may_overlap) {
+        memory_region_add_subregion_overlap(get_system_memory(),
+                                            addr,
+                                            dev->mmio[n].memory,
+                                            priority);
+    }
+    else {
+        memory_region_add_subregion(get_system_memory(),
+                                    addr,
+                                    dev->mmio[n].memory);
+    }
+}
+
+void sysbus_mmio_unmap(SysBusDevice *dev, int n)
+{
+    assert(n >= 0 && n < dev->num_mmio);
+
+    if (dev->mmio[n].addr != (hwaddr)-1) {
+        memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
+        dev->mmio[n].addr = (hwaddr)-1;
+    }
+}
+
+void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
+{
+    sysbus_mmio_map_common(dev, n, addr, false, 0);
+}
+
+void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
+                             int priority)
+{
+    sysbus_mmio_map_common(dev, n, addr, true, priority);
+}
+
+/* Request an IRQ source.  The actual IRQ object may be populated later.  */
+void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
+{
+    qdev_init_gpio_out_named(DEVICE(dev), p, SYSBUS_DEVICE_GPIO_IRQ, 1);
+}
+
+/* Pass IRQs from a target device.  */
+void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
+{
+    qdev_pass_gpios(DEVICE(target), DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ);
+}
+
+void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)
+{
+    int n;
+
+    assert(dev->num_mmio < QDEV_MAX_MMIO);
+    n = dev->num_mmio++;
+    dev->mmio[n].addr = -1;
+    dev->mmio[n].memory = memory;
+}
+
+MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)
+{
+    assert(n >= 0 && n < QDEV_MAX_MMIO);
+    return dev->mmio[n].memory;
+}
+
+void sysbus_init_ioports(SysBusDevice *dev, uint32_t ioport, uint32_t size)
+{
+    uint32_t i;
+
+    for (i = 0; i < size; i++) {
+        assert(dev->num_pio < QDEV_MAX_PIO);
+        dev->pio[dev->num_pio++] = ioport++;
+    }
+}
+
+/* The purpose of preserving this empty realize function
+ * is to prevent the parent_realize field of some subclasses
+ * from being set to NULL to break the normal init/realize
+ * of some devices.
+ */
+static void sysbus_device_realize(DeviceState *dev, Error **errp)
+{
+}
+
+DeviceState *sysbus_create_varargs(const char *name,
+                                   hwaddr addr, ...)
+{
+    DeviceState *dev;
+    SysBusDevice *s;
+    va_list va;
+    qemu_irq irq;
+    int n;
+
+    dev = qdev_new(name);
+    s = SYS_BUS_DEVICE(dev);
+    sysbus_realize_and_unref(s, &error_fatal);
+    if (addr != (hwaddr)-1) {
+        sysbus_mmio_map(s, 0, addr);
+    }
+    va_start(va, addr);
+    n = 0;
+    while (1) {
+        irq = va_arg(va, qemu_irq);
+        if (!irq) {
+            break;
+        }
+        sysbus_connect_irq(s, n, irq);
+        n++;
+    }
+    va_end(va);
+    return dev;
+}
+
+bool sysbus_realize(SysBusDevice *dev, Error **errp)
+{
+    return qdev_realize(DEVICE(dev), sysbus_get_default(), errp);
+}
+
+bool sysbus_realize_and_unref(SysBusDevice *dev, Error **errp)
+{
+    return qdev_realize_and_unref(DEVICE(dev), sysbus_get_default(), errp);
+}
+
+static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
+{
+    SysBusDevice *s = SYS_BUS_DEVICE(dev);
+    hwaddr size;
+    int i;
+
+    for (i = 0; i < s->num_mmio; i++) {
+        size = memory_region_size(s->mmio[i].memory);
+        monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
+                       indent, "", s->mmio[i].addr, size);
+    }
+}
+
+static char *sysbus_get_fw_dev_path(DeviceState *dev)
+{
+    SysBusDevice *s = SYS_BUS_DEVICE(dev);
+    SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(s);
+    char *addr, *fw_dev_path;
+
+    if (sbc->explicit_ofw_unit_address) {
+        addr = sbc->explicit_ofw_unit_address(s);
+        if (addr) {
+            fw_dev_path = g_strdup_printf("%s@%s", qdev_fw_name(dev), addr);
+            g_free(addr);
+            return fw_dev_path;
+        }
+    }
+    if (s->num_mmio) {
+        return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
+                               s->mmio[0].addr);
+    }
+    if (s->num_pio) {
+        return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
+    }
+    return g_strdup(qdev_fw_name(dev));
+}
+
+void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
+                       MemoryRegion *mem)
+{
+    memory_region_add_subregion(get_system_io(), addr, mem);
+}
+
+MemoryRegion *sysbus_address_space(SysBusDevice *dev)
+{
+    return get_system_memory();
+}
+
+static void sysbus_device_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *k = DEVICE_CLASS(klass);
+    k->realize = sysbus_device_realize;
+    k->bus_type = TYPE_SYSTEM_BUS;
+    /*
+     * device_add plugs devices into a suitable bus.  For "real" buses,
+     * that actually connects the device.  For sysbus, the connections
+     * need to be made separately, and device_add can't do that.  The
+     * device would be left unconnected, and will probably not work
+     *
+     * However, a few machines can handle device_add/-device with
+     * a few specific sysbus devices. In those cases, the device
+     * subclass needs to override it and set user_creatable=true.
+     */
+    k->user_creatable = false;
+}
+
+static const TypeInfo sysbus_device_type_info = {
+    .name = TYPE_SYS_BUS_DEVICE,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(SysBusDevice),
+    .abstract = true,
+    .class_size = sizeof(SysBusDeviceClass),
+    .class_init = sysbus_device_class_init,
+};
+
+static BusState *main_system_bus;
+
+static void main_system_bus_create(void)
+{
+    /*
+     * assign main_system_bus before qbus_init()
+     * in order to make "if (bus != sysbus_get_default())" work
+     */
+    main_system_bus = g_malloc0(system_bus_info.instance_size);
+    qbus_init(main_system_bus, system_bus_info.instance_size,
+              TYPE_SYSTEM_BUS, NULL, "main-system-bus");
+    OBJECT(main_system_bus)->free = g_free;
+}
+
+BusState *sysbus_get_default(void)
+{
+    if (!main_system_bus) {
+        main_system_bus_create();
+    }
+    return main_system_bus;
+}
+
+static void sysbus_register_types(void)
+{
+    type_register_static(&system_bus_info);
+    type_register_static(&sysbus_device_type_info);
+}
+
+type_init(sysbus_register_types)