[Qemu-devel] [RFC 3/4] Add MMIO based virtio transport

[Peter Maydell]

Add support for the generic MMIO based virtio transport (including
blk, net, serial and balloon devices).

Signed-off-by: Peter Maydell <address@hidden>
---
 Makefile.objs    |    1 +
 hw/virtio-mmio.c |  426 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 427 insertions(+), 0 deletions(-)
 create mode 100644 hw/virtio-mmio.c

diff --git a/Makefile.objs b/Makefile.objs
index d7a6539..f7b6dbc 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -188,6 +188,7 @@ hw-obj-y += vl.o loader.o
 hw-obj-$(CONFIG_VIRTIO) += virtio-console.o
 hw-obj-y += usb-libhw.o
 hw-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o
+hw-obj-$(CONFIG_VIRTIO) += virtio-mmio.o
 hw-obj-y += fw_cfg.o
 hw-obj-$(CONFIG_PCI) += pci.o pci_bridge.o
 hw-obj-$(CONFIG_PCI) += msix.o msi.o
diff --git a/hw/virtio-mmio.c b/hw/virtio-mmio.c
new file mode 100644
index 0000000..9c81440
--- /dev/null
+++ b/hw/virtio-mmio.c
@@ -0,0 +1,426 @@
+/*
+ * Virtio MMIO bindings
+ *
+ * Copyright (c) 2011 Linaro Limited
+ *
+ * Author:
+ *  Peter Maydell <address@hidden>
+ *
+ * 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-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' */
+
+typedef struct {
+    /* Generic */
+    SysBusDevice busdev;
+    VirtIODevice *vdev;
+    MemoryRegion iomem;
+    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;
+    /* virtio-blk */
+    BlockConf block;
+    char *block_serial;
+    /* virtio-net */
+    NICConf nic;
+    virtio_net_conf net;
+    /* virtio-serial */
+    virtio_serial_conf serial;
+} VirtIOMMIOProxy;
+
+static uint64_t virtio_mmio_read(void *opaque, target_phys_addr_t offset,
+                                 unsigned size)
+{
+    VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
+    VirtIODevice *vdev = proxy->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 (proxy->host_features_sel) {
+            return 0;
+        }
+        return proxy->host_features;
+    case VIRTIO_MMIO_QUEUENUMMAX:
+        return VIRTQUEUE_MAX_SIZE;
+    case VIRTIO_MMIO_QUEUEPFN:
+        return virtio_queue_get_addr(vdev, vdev->queue_sel)
+            >> proxy->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)
+{
+    VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
+    VirtIODevice *vdev = proxy->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);
+        case 2:
+            virtio_config_writew(vdev, offset, value);
+        case 4:
+            virtio_config_writel(vdev, offset, value);
+        default:
+            abort();
+        }
+        return;
+    }
+    if (size != 4) {
+        DPRINTF("wrong size access to register!\n");
+        return;
+    }
+    switch (offset) {
+    case VIRTIO_MMIO_HOSTFEATURESSEL:
+        proxy->host_features_sel = value;
+        break;
+    case VIRTIO_MMIO_GUESTFEATURES:
+        if (!proxy->guest_features_sel) {
+            vdev->guest_features = value;
+        }
+        break;
+    case VIRTIO_MMIO_GUESTFEATURESSEL:
+        proxy->guest_features_sel = value;
+        break;
+    case VIRTIO_MMIO_GUESTPAGESIZE:
+        proxy->guest_page_shift = ctz32(value);
+        if (proxy->guest_page_shift > 31) {
+            proxy->guest_page_shift = 0;
+        }
+        DPRINTF("guest page size %" PRIx64 " shift %d\n", value,
+                proxy->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 << proxy->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)
+{
+    VirtIOMMIOProxy *proxy = opaque;
+    int level = (proxy->vdev->isr != 0);
+    DPRINTF("virtio_mmio setting IRQ %d\n", level);
+    qemu_set_irq(proxy->irq, level);
+}
+
+static unsigned int virtio_mmio_get_features(void *opaque)
+{
+    VirtIOMMIOProxy *proxy = opaque;
+    return proxy->host_features;
+}
+
+static int virtio_mmio_load_config(void *opaque, QEMUFile *f)
+{
+    VirtIOMMIOProxy *proxy = opaque;
+    proxy->int_enable = qemu_get_be32(f);
+    proxy->host_features = qemu_get_be32(f);
+    proxy->host_features_sel = qemu_get_be32(f);
+    proxy->guest_features_sel = qemu_get_be32(f);
+    proxy->guest_page_shift = qemu_get_be32(f);
+    return 0;
+}
+
+static void virtio_mmio_save_config(void *opaque, QEMUFile *f)
+{
+    VirtIOMMIOProxy *proxy = opaque;
+    qemu_put_be32(f, proxy->int_enable);
+    qemu_put_be32(f, proxy->host_features);
+    qemu_put_be32(f, proxy->host_features_sel);
+    qemu_put_be32(f, proxy->guest_features_sel);
+    qemu_put_be32(f, proxy->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 int virtio_init_mmio(VirtIOMMIOProxy *proxy, VirtIODevice *vdev)
+{
+    proxy->vdev = vdev;
+    proxy->vdev->nvectors = 0;
+    sysbus_init_irq(&proxy->busdev, &proxy->irq);
+    memory_region_init_io(&proxy->iomem, &virtio_mem_ops, proxy,
+                          "virtio-mmio", 0x1000);
+    sysbus_init_mmio_region(&proxy->busdev, &proxy->iomem);
+    virtio_bind_device(vdev, &virtio_mmio_bindings, proxy);
+    proxy->host_features |= (0x1 << VIRTIO_F_NOTIFY_ON_EMPTY);
+    proxy->host_features = vdev->get_features(vdev, proxy->host_features);
+    return 0;
+}
+
+
+static int virtio_blk_init_mmio(SysBusDevice *dev)
+{
+    VirtIODevice *vdev;
+    VirtIOMMIOProxy *proxy = FROM_SYSBUS(VirtIOMMIOProxy, dev);
+    vdev = virtio_blk_init(&dev->qdev, &proxy->block, &proxy->block_serial);
+    if (!vdev) {
+        return -1;
+    }
+    return virtio_init_mmio(proxy, vdev);
+}
+
+static int virtio_net_init_mmio(SysBusDevice *dev)
+{
+    VirtIODevice *vdev;
+    VirtIOMMIOProxy *proxy = FROM_SYSBUS(VirtIOMMIOProxy, dev);
+    vdev = virtio_net_init(&dev->qdev, &proxy->nic, &proxy->net);
+    if (!vdev) {
+        return -1;
+    }
+    return virtio_init_mmio(proxy, vdev);
+}
+
+static int virtio_serial_init_mmio(SysBusDevice *dev)
+{
+    VirtIODevice *vdev;
+    VirtIOMMIOProxy *proxy = FROM_SYSBUS(VirtIOMMIOProxy, dev);
+    vdev = virtio_serial_init(&dev->qdev, &proxy->serial);
+    if (!vdev) {
+        return -1;
+    }
+    return virtio_init_mmio(proxy, vdev);
+}
+
+static int virtio_balloon_init_mmio(SysBusDevice *dev)
+{
+    VirtIODevice *vdev;
+    VirtIOMMIOProxy *proxy = FROM_SYSBUS(VirtIOMMIOProxy, dev);
+    vdev = virtio_balloon_init(&dev->qdev);
+    if (!vdev) {
+        return -1;
+    }
+    return virtio_init_mmio(proxy, vdev);
+}
+
+static void virtio_mmio_reset(DeviceState *d)
+{
+    VirtIOMMIOProxy *proxy = FROM_SYSBUS(VirtIOMMIOProxy, sysbus_from_qdev(d));
+    virtio_reset(proxy->vdev);
+}
+
+static SysBusDeviceInfo virtio_mmio_info[] = {
+    {
+        .qdev.name = "virtio-blk-mmio",
+        .qdev.size = sizeof(VirtIOMMIOProxy),
+        .init = virtio_blk_init_mmio,
+        .qdev.reset = virtio_mmio_reset,
+        .qdev.props = (Property[]) {
+            DEFINE_BLOCK_PROPERTIES(VirtIOMMIOProxy, block),
+            DEFINE_PROP_STRING("serial", VirtIOMMIOProxy, block_serial),
+            DEFINE_VIRTIO_BLK_FEATURES(VirtIOMMIOProxy, host_features),
+            DEFINE_PROP_END_OF_LIST(),
+        },
+    },{
+        .qdev.name = "virtio-net-mmio",
+        .qdev.size = sizeof(VirtIOMMIOProxy),
+        .init = virtio_net_init_mmio,
+        .qdev.reset = virtio_mmio_reset,
+        .qdev.props = (Property[]) {
+            DEFINE_VIRTIO_NET_FEATURES(VirtIOMMIOProxy, host_features),
+            DEFINE_NIC_PROPERTIES(VirtIOMMIOProxy, nic),
+            DEFINE_PROP_UINT32("x-txtimer", VirtIOMMIOProxy,
+                               net.txtimer, TX_TIMER_INTERVAL),
+            DEFINE_PROP_INT32("x-txburst", VirtIOMMIOProxy,
+                              net.txburst, TX_BURST),
+            DEFINE_PROP_STRING("tx", VirtIOMMIOProxy, net.tx),
+            DEFINE_PROP_END_OF_LIST(),
+        },
+    },{
+        .qdev.name = "virtio-serial-mmio",
+        .qdev.size = sizeof(VirtIOMMIOProxy),
+        .init = virtio_serial_init_mmio,
+        .qdev.reset = virtio_mmio_reset,
+        .qdev.props = (Property[]) {
+            DEFINE_VIRTIO_COMMON_FEATURES(VirtIOMMIOProxy, host_features),
+            DEFINE_PROP_UINT32("max_ports", VirtIOMMIOProxy,
+                               serial.max_virtserial_ports, 31),
+            DEFINE_PROP_END_OF_LIST(),
+        },
+    },{
+        .qdev.name = "virtio-balloon-mmio",
+        .qdev.size = sizeof(VirtIOMMIOProxy),
+        .init = virtio_balloon_init_mmio,
+        .qdev.reset = virtio_mmio_reset,
+        .qdev.props = (Property[]) {
+            DEFINE_VIRTIO_COMMON_FEATURES(VirtIOMMIOProxy, host_features),
+            DEFINE_PROP_END_OF_LIST(),
+        },
+    },{
+        /* end of list */
+    }
+};
+
+static void virtio_mmio_register_devices(void)
+{
+    SysBusDeviceInfo *info;
+    for (info = virtio_mmio_info; info->qdev.name; info++) {
+        sysbus_register_withprop(info);
+    }
+}
+
+device_init(virtio_mmio_register_devices)
-- 
1.7.1