--- /dev/null
+/*
+ * Virtio MMIO bindings
+ *
+ * Copyright (c) 2011 Linaro Limited
+ *
+ * Authors:
+ * Peter Maydell <peter.maydell@linaro.org>
+ * Evgeny Voevodin <e.voevodin@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* TODO:
+ * * save/load support
+ * * test net, serial, balloon
+ */
+
+#include "sysbus.h"
+#include "virtio.h"
+#include "virtio-transport.h"
+#include "virtio-blk.h"
+#include "virtio-net.h"
+#include "virtio-serial.h"
+#include "host-utils.h"
+
+/* #define DEBUG_VIRTIO_MMIO */
+
+#ifdef DEBUG_VIRTIO_MMIO
+
+#define DPRINTF(fmt, ...) \
+do { printf("virtio_mmio: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while (0)
+#endif
+
+/* Memory mapped register offsets */
+#define VIRTIO_MMIO_MAGIC 0x0
+#define VIRTIO_MMIO_VERSION 0x4
+#define VIRTIO_MMIO_DEVICEID 0x8
+#define VIRTIO_MMIO_VENDORID 0xc
+#define VIRTIO_MMIO_HOSTFEATURES 0x10
+#define VIRTIO_MMIO_HOSTFEATURESSEL 0x14
+#define VIRTIO_MMIO_GUESTFEATURES 0x20
+#define VIRTIO_MMIO_GUESTFEATURESSEL 0x24
+#define VIRTIO_MMIO_GUESTPAGESIZE 0x28
+#define VIRTIO_MMIO_QUEUESEL 0x30
+#define VIRTIO_MMIO_QUEUENUMMAX 0x34
+#define VIRTIO_MMIO_QUEUENUM 0x38
+#define VIRTIO_MMIO_QUEUEALIGN 0x3c
+#define VIRTIO_MMIO_QUEUEPFN 0x40
+#define VIRTIO_MMIO_QUEUENOTIFY 0x50
+#define VIRTIO_MMIO_INTERRUPTSTATUS 0x60
+#define VIRTIO_MMIO_INTERRUPTACK 0x64
+#define VIRTIO_MMIO_STATUS 0x70
+/* Device specific config space starts here */
+#define VIRTIO_MMIO_CONFIG 0x100
+
+#define VIRT_MAGIC 0x74726976 /* 'virt' */
+#define VIRT_VERSION 1
+#define VIRT_VENDOR 0x554D4551 /* 'QEMU' */
+
+#define VIRTIO_MMIO "virtio-mmio"
+#define VIRTIO_MMIO_BUS "virtio-mmio-bus"
+
+struct BusInfo virtio_mmio_bus_info = {
+ .name = VIRTIO_MMIO_BUS,
+ .size = sizeof(BusState),
+};
+
+enum VIRTIO_MMIO_MAPPINGS {
+ VIRTIO_MMIO_IOMAP,
+ VIRTIO_MMIO_IOMEM,
+};
+
+typedef struct {
+ SysBusDevice busdev;
+ VirtIODevice *vdev;
+ MemoryRegion iomap; /* hold base address */
+ MemoryRegion iomem; /* hold io funcs */
+ MemoryRegion alias;
+ qemu_irq irq;
+ uint32_t int_enable;
+ uint32_t host_features;
+ uint32_t host_features_sel;
+ uint32_t guest_features_sel;
+ uint32_t guest_page_shift;
+} VirtIOMMIOTransportState;
+
+static uint64_t virtio_mmio_read(void *opaque, target_phys_addr_t offset,
+ unsigned size)
+{
+ VirtIOMMIOTransportState *transport = (VirtIOMMIOTransportState *)opaque;
+ VirtIODevice *vdev = transport->vdev;
+ DPRINTF("virtio_mmio_read offset 0x%x\n", (int)offset);
+ if (offset >= VIRTIO_MMIO_CONFIG) {
+ offset -= VIRTIO_MMIO_CONFIG;
+ switch (size) {
+ case 1:
+ return virtio_config_readb(vdev, offset);
+ case 2:
+ return virtio_config_readw(vdev, offset);
+ case 4:
+ return virtio_config_readl(vdev, offset);
+ default:
+ abort();
+ }
+ }
+ if (size != 4) {
+ DPRINTF("wrong size access to register!\n");
+ return 0;
+ }
+ switch (offset) {
+ case VIRTIO_MMIO_MAGIC:
+ return VIRT_MAGIC;
+ case VIRTIO_MMIO_VERSION:
+ return VIRT_VERSION;
+ case VIRTIO_MMIO_DEVICEID:
+ return vdev->device_id;
+ case VIRTIO_MMIO_VENDORID:
+ return VIRT_VENDOR;
+ case VIRTIO_MMIO_HOSTFEATURES:
+ if (transport->host_features_sel) {
+ return 0;
+ }
+ return transport->host_features;
+ case VIRTIO_MMIO_QUEUENUMMAX:
+ return VIRTQUEUE_MAX_SIZE;
+ case VIRTIO_MMIO_QUEUEPFN:
+ return virtio_queue_get_addr(vdev, vdev->queue_sel)
+ >> transport->guest_page_shift;
+ case VIRTIO_MMIO_INTERRUPTSTATUS:
+ return vdev->isr;
+ case VIRTIO_MMIO_STATUS:
+ return vdev->status;
+ case VIRTIO_MMIO_HOSTFEATURESSEL:
+ case VIRTIO_MMIO_GUESTFEATURES:
+ case VIRTIO_MMIO_GUESTFEATURESSEL:
+ case VIRTIO_MMIO_GUESTPAGESIZE:
+ case VIRTIO_MMIO_QUEUESEL:
+ case VIRTIO_MMIO_QUEUENUM:
+ case VIRTIO_MMIO_QUEUEALIGN:
+ case VIRTIO_MMIO_QUEUENOTIFY:
+ case VIRTIO_MMIO_INTERRUPTACK:
+ DPRINTF("read of write-only register\n");
+ return 0;
+ default:
+ DPRINTF("bad register offset\n");
+ return 0;
+ }
+ return 0;
+}
+
+static void virtio_mmio_write(void *opaque, target_phys_addr_t offset,
+ uint64_t value, unsigned size)
+{
+ VirtIOMMIOTransportState *transport = (VirtIOMMIOTransportState *)opaque;
+ VirtIODevice *vdev = transport->vdev;
+ DPRINTF("virtio_mmio_write offset 0x%x value 0x%" PRIx64 "\n",
+ (int)offset, value);
+ if (offset >= VIRTIO_MMIO_CONFIG) {
+ offset -= VIRTIO_MMIO_CONFIG;
+ switch (size) {
+ case 1:
+ virtio_config_writeb(vdev, offset, value);
+ break;
+ case 2:
+ virtio_config_writew(vdev, offset, value);
+ break;
+ case 4:
+ virtio_config_writel(vdev, offset, value);
+ break;
+ default:
+ abort();
+ }
+ return;
+ }
+ if (size != 4) {
+ DPRINTF("wrong size access to register!\n");
+ return;
+ }
+ switch (offset) {
+ case VIRTIO_MMIO_HOSTFEATURESSEL:
+ transport->host_features_sel = value;
+ break;
+ case VIRTIO_MMIO_GUESTFEATURES:
+ if (!transport->guest_features_sel) {
+ virtio_set_features(vdev, value);
+ }
+ break;
+ case VIRTIO_MMIO_GUESTFEATURESSEL:
+ transport->guest_features_sel = value;
+ break;
+ case VIRTIO_MMIO_GUESTPAGESIZE:
+ transport->guest_page_shift = ctz32(value);
+ if (transport->guest_page_shift > 31) {
+ transport->guest_page_shift = 0;
+ }
+ DPRINTF("guest page size %" PRIx64 " shift %d\n", value,
+ transport->guest_page_shift);
+ break;
+ case VIRTIO_MMIO_QUEUESEL:
+ if (value < VIRTIO_PCI_QUEUE_MAX) {
+ vdev->queue_sel = value;
+ }
+ break;
+ case VIRTIO_MMIO_QUEUENUM:
+ DPRINTF("mmio_queue write %d max %d\n", (int)value, VIRTQUEUE_MAX_SIZE);
+ if (value <= VIRTQUEUE_MAX_SIZE) {
+ DPRINTF("calling virtio_queue_set_num\n");
+ virtio_queue_set_num(vdev, vdev->queue_sel, value);
+ }
+ break;
+ case VIRTIO_MMIO_QUEUEALIGN:
+ virtio_queue_set_align(vdev, vdev->queue_sel, value);
+ break;
+ case VIRTIO_MMIO_QUEUEPFN:
+ if (value == 0) {
+ virtio_reset(vdev);
+ } else {
+ virtio_queue_set_addr(vdev, vdev->queue_sel,
+ value << transport->guest_page_shift);
+ }
+ break;
+ case VIRTIO_MMIO_QUEUENOTIFY:
+ if (value < VIRTIO_PCI_QUEUE_MAX) {
+ virtio_queue_notify(vdev, value);
+ }
+ break;
+ case VIRTIO_MMIO_INTERRUPTACK:
+ vdev->isr &= ~value;
+ virtio_update_irq(vdev);
+ break;
+ case VIRTIO_MMIO_STATUS:
+ virtio_set_status(vdev, value & 0xff);
+ if (vdev->status == 0) {
+ virtio_reset(vdev);
+ }
+ break;
+ case VIRTIO_MMIO_MAGIC:
+ case VIRTIO_MMIO_VERSION:
+ case VIRTIO_MMIO_DEVICEID:
+ case VIRTIO_MMIO_VENDORID:
+ case VIRTIO_MMIO_HOSTFEATURES:
+ case VIRTIO_MMIO_QUEUENUMMAX:
+ case VIRTIO_MMIO_INTERRUPTSTATUS:
+ DPRINTF("write to readonly register\n");
+ break;
+
+ default:
+ DPRINTF("bad register offset\n");
+ }
+}
+
+static const MemoryRegionOps virtio_mem_ops = {
+ .read = virtio_mmio_read,
+ .write = virtio_mmio_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void virtio_mmio_update_irq(void *opaque, uint16_t vector)
+{
+ VirtIOMMIOTransportState *transport = opaque;
+ int level = (transport->vdev->isr != 0);
+ DPRINTF("virtio_mmio setting IRQ %d\n", level);
+ qemu_set_irq(transport->irq, level);
+}
+
+static unsigned int virtio_mmio_get_features(void *opaque)
+{
+ VirtIOMMIOTransportState *transport = opaque;
+ return transport->host_features;
+}
+
+static int virtio_mmio_load_config(void *opaque, QEMUFile *f)
+{
+ VirtIOMMIOTransportState *transport = opaque;
+ transport->int_enable = qemu_get_be32(f);
+ transport->host_features = qemu_get_be32(f);
+ transport->host_features_sel = qemu_get_be32(f);
+ transport->guest_features_sel = qemu_get_be32(f);
+ transport->guest_page_shift = qemu_get_be32(f);
+ return 0;
+}
+
+static void virtio_mmio_save_config(void *opaque, QEMUFile *f)
+{
+ VirtIOMMIOTransportState *transport = opaque;
+ qemu_put_be32(f, transport->int_enable);
+ qemu_put_be32(f, transport->host_features);
+ qemu_put_be32(f, transport->host_features_sel);
+ qemu_put_be32(f, transport->guest_features_sel);
+ qemu_put_be32(f, transport->guest_page_shift);
+}
+
+static VirtIOBindings virtio_mmio_bindings = {
+ .notify = virtio_mmio_update_irq,
+ .get_features = virtio_mmio_get_features,
+ .save_config = virtio_mmio_save_config,
+ .load_config = virtio_mmio_load_config,
+};
+
+static void virtio_mmio_attach_to_transport(DeviceState *dev)
+{
+ DeviceState *transport_dev = qdev_get_parent_bus(dev)->parent;
+ SysBusDevice *transport_sysbus = sysbus_from_qdev(transport_dev);
+ VirtIOMMIOTransportState *transport =
+ FROM_SYSBUS(VirtIOMMIOTransportState, transport_sysbus);
+
+ /* Create alias and add it as subregion to transport iomem */
+ memory_region_init_alias(&transport->alias,
+ "virtio-mmio-alias",
+ &transport->iomem,
+ 0,
+ 0x1000);
+ /* add alias as subregion to transport iomap */
+ memory_region_add_subregion(&transport->iomap,
+ 0,
+ &transport->alias);
+}
+
+static int virtio_init_mmio_transport(DeviceState *dev, VirtIODevice *vdev)
+{
+ DeviceState *transport_dev = qdev_get_parent_bus(dev)->parent;
+ SysBusDevice *transport_sysbus = sysbus_from_qdev(transport_dev);
+ VirtIOMMIOTransportState *transport =
+ FROM_SYSBUS(VirtIOMMIOTransportState, transport_sysbus);
+
+ transport->vdev = vdev;
+ transport->vdev->nvectors = 0;
+ sysbus_init_irq(&transport->busdev, &transport->irq);
+ memory_region_init_io(&transport->iomem, &virtio_mem_ops, transport,
+ "virtio-mmio-iomem", 0x1000);
+ sysbus_init_mmio(&transport->busdev, &transport->iomem);
+ virtio_bind_device(vdev, &virtio_mmio_bindings, transport);
+ transport->host_features |= (0x1 << VIRTIO_F_NOTIFY_ON_EMPTY);
+ transport->host_features =
+ vdev->get_features(vdev, transport->host_features);
+
+ virtio_mmio_attach_to_transport(dev);
+ return 0;
+}
+
+static void virtio_mmio_transport_handler(void *opaque, int irq, int level)
+{
+ VirtIOMMIOTransportState *s = (VirtIOMMIOTransportState *)opaque;
+
+ qemu_set_irq(s->irq, level);
+
+ return;
+}
+
+static int virtio_mmio_transport_device_init(SysBusDevice *busdev)
+{
+ VirtIOMMIOTransportState *s =
+ DO_UPCAST(VirtIOMMIOTransportState, busdev, busdev);
+ BusState *parent_bus = qdev_get_parent_bus(&busdev->qdev);
+ BusState *child_bus;
+ VirtIOTransportBusState *virtio_transport_bus;
+ char *buf;
+ int len;
+ uint32_t i;
+
+ i = virtio_count_siblings(parent_bus, VIRTIO_MMIO);
+
+ len = strlen(VIRTIO_MMIO) + 16;
+ buf = g_malloc(len);
+ snprintf(buf, len, "%s.%d", VIRTIO_MMIO, i);
+ child_bus = qbus_create(&virtio_transport_bus_info, &busdev->qdev, buf);
+
+ /* Populate mmio init transport function */
+ virtio_transport_bus = DO_UPCAST(VirtIOTransportBusState, bus, child_bus);
+ virtio_transport_bus->init_fn = virtio_init_mmio_transport;
+
+ qdev_init_gpio_in(&s->busdev.qdev, virtio_mmio_transport_handler, 1);
+
+ sysbus_init_irq(busdev, &s->irq);
+ memory_region_init(&s->iomap, "virtio-mmio-iomap", 0x1000);
+ sysbus_init_mmio(busdev, &s->iomap);
+ return 0;
+}
+
+static void virtio_mmio_reset(DeviceState *d)
+{
+ VirtIOMMIOTransportState *transport =
+ FROM_SYSBUS(VirtIOMMIOTransportState, sysbus_from_qdev(d));
+ if (transport->vdev) {
+ virtio_reset(transport->vdev);
+ }
+}
+
+static void virtio_mmio_transport_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+ k->init = virtio_mmio_transport_device_init;
+ dc->reset = virtio_mmio_reset;
+}
+
+static TypeInfo virtio_mmio_transport_info = {
+ .name = VIRTIO_MMIO_TRANSPORT,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(VirtIOMMIOTransportState),
+ .class_init = virtio_mmio_transport_class_init,
+};
+
+static void virtio_mmio_register_types(void)
+{
+ type_register_static(&virtio_mmio_transport_info);
+}
+
+type_init(virtio_mmio_register_types)
projects / sdk / emulator / qemu.git / commitdiff