Patchwork [RFC,v7,4/8] virtio-pci : Refactor virtio-pci device.

login
register
mail settings
Submitter fred.konrad@greensocs.com
Date Dec. 10, 2012, 4:45 p.m.
Message ID <1355157952-2321-5-git-send-email-fred.konrad@greensocs.com>
Download mbox | patch
Permalink /patch/205000/
State New
Headers show

Comments

fred.konrad@greensocs.com - Dec. 10, 2012, 4:45 p.m.
From: KONRAD Frederic <fred.konrad@greensocs.com>

Create the virtio-pci device. This transport device will create a
virtio-pci-bus, so one VirtIODevice can be connected.

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
---
 hw/virtio-pci.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/virtio-pci.h |  19 +++++++++
 2 files changed, 146 insertions(+)

Patch

diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 5ac8d0d..8de26fd 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -1119,6 +1119,130 @@  static TypeInfo virtio_scsi_info = {
     .class_init    = virtio_scsi_class_init,
 };
 
+/*
+ * virtio-pci : This is the PCIDevice which have a virtio-pci-bus.
+ */
+
+/* This is called by virtio-bus just after the device is plugged. */
+static void virtio_pci_device_plugged(void *opaque)
+{
+    VirtIOPCIProxy *proxy = VIRTIO_PCI(opaque);
+    uint8_t *config;
+    uint32_t size;
+
+    /* Put the PCI IDs */
+    switch (get_virtio_device_id(proxy->bus)) {
+
+    case VIRTIO_ID_BLOCK:
+        pci_config_set_device_id(proxy->pci_dev.config,
+                                 PCI_DEVICE_ID_VIRTIO_BLOCK);
+        pci_config_set_class(proxy->pci_dev.config, PCI_CLASS_STORAGE_SCSI);
+    break;
+    default:
+        error_report("unknown device id\n");
+    break;
+
+    }
+
+    /* TODO: vdev should be accessed through virtio-bus functions. */
+    proxy->vdev = proxy->bus->vdev;
+    config = proxy->pci_dev.config;
+
+    if (proxy->class_code) {
+        pci_config_set_class(config, proxy->class_code);
+    }
+    pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
+                 pci_get_word(config + PCI_VENDOR_ID));
+    pci_set_word(config + PCI_SUBSYSTEM_ID, get_virtio_device_id(proxy->bus));
+    config[PCI_INTERRUPT_PIN] = 1;
+
+    if (proxy->bus->vdev->nvectors &&
+        msix_init_exclusive_bar(&proxy->pci_dev, proxy->bus->vdev->nvectors,
+                                1)) {
+        proxy->bus->vdev->nvectors = 0;
+    }
+
+    proxy->pci_dev.config_write = virtio_write_config;
+
+    size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
+         + proxy->bus->vdev->config_len;
+    if (size & (size-1)) {
+        size = 1 << qemu_fls(size);
+    }
+
+    memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
+                          "virtio-pci", size);
+    pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
+                     &proxy->bar);
+
+    if (!kvm_has_many_ioeventfds()) {
+        proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
+    }
+
+    proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
+    proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
+    proxy->host_features = proxy->bus->vdev->get_features(proxy->bus->vdev,
+                                                          proxy->host_features);
+}
+
+/* This is called by virtio-bus just before the device is unplugged. */
+static void virtio_pci_device_unplug(void *opaque)
+{
+    VirtIOPCIProxy *dev = VIRTIO_PCI(opaque);
+    virtio_pci_stop_ioeventfd(dev);
+}
+
+static int virtio_pci_init(PCIDevice *pci_dev)
+{
+    VirtIOPCIProxy *dev = VIRTIO_PCI(pci_dev);
+    VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
+    dev->bus = virtio_pci_bus_new(dev);
+    if (k->init != NULL) {
+        return k->init(dev);
+    }
+    return 0;
+}
+
+static void virtio_pci_exit(PCIDevice *pci_dev)
+{
+    VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
+    VirtioBusState *bus = VIRTIO_BUS(proxy->bus);
+    BusState *qbus = BUS(proxy->bus);
+    virtio_bus_destroy_device(bus);
+    qbus_free(qbus);
+}
+
+static void virtio_pci_rst(DeviceState *qdev)
+{
+    VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
+    VirtioBusState *bus = VIRTIO_BUS(proxy->bus);
+    virtio_pci_stop_ioeventfd(proxy);
+    virtio_bus_reset(bus);
+    msix_unuse_all_vectors(&proxy->pci_dev);
+    proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
+}
+
+static void virtio_pci_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->init = virtio_pci_init;
+    k->exit = virtio_pci_exit;
+    k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
+    k->revision = VIRTIO_PCI_ABI_VERSION;
+    k->class_id = PCI_CLASS_OTHERS;
+    dc->reset = virtio_pci_rst;
+}
+
+static const TypeInfo virtio_pci_info = {
+    .name          = TYPE_VIRTIO_PCI,
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(VirtIOPCIProxy),
+    .class_init    = virtio_pci_class_init,
+    .class_size    = sizeof(VirtioPCIClass),
+};
+
 /* virtio-pci-bus */
 
 VirtioBusState *virtio_pci_bus_new(VirtIOPCIProxy *dev)
@@ -1145,6 +1269,8 @@  static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
     k->set_host_notifier = virtio_pci_set_host_notifier;
     k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
     k->vmstate_change = virtio_pci_vmstate_change;
+    k->device_plugged = virtio_pci_device_plugged;
+    k->device_unplug = virtio_pci_device_unplug;
 }
 
 static const TypeInfo virtio_pci_bus_info = {
@@ -1163,6 +1289,7 @@  static void virtio_pci_register_types(void)
     type_register_static(&virtio_scsi_info);
     type_register_static(&virtio_rng_info);
     type_register_static(&virtio_pci_bus_info);
+    type_register_static(&virtio_pci_info);
 }
 
 type_init(virtio_pci_register_types)
diff --git a/hw/virtio-pci.h b/hw/virtio-pci.h
index 0e3288e..e840cea 100644
--- a/hw/virtio-pci.h
+++ b/hw/virtio-pci.h
@@ -46,6 +46,22 @@  typedef struct {
     unsigned int users;
 } VirtIOIRQFD;
 
+/*
+ * virtio-pci : This is the PCIDevice which have a virtio-pci-bus.
+ */
+#define TYPE_VIRTIO_PCI "virtio-pci"
+#define VIRTIO_PCI_GET_CLASS(obj) \
+        OBJECT_GET_CLASS(VirtioPCIClass, obj, TYPE_VIRTIO_PCI)
+#define VIRTIO_PCI_CLASS(klass) \
+        OBJECT_CLASS_CHECK(VirtioPCIClass, klass, TYPE_VIRTIO_PCI)
+#define VIRTIO_PCI(obj) \
+        OBJECT_CHECK(VirtIOPCIProxy, (obj), TYPE_VIRTIO_PCI)
+
+typedef struct VirtioPCIClass {
+    PCIDeviceClass parent_class;
+    int (*init)(VirtIOPCIProxy *vpci_dev);
+} VirtioPCIClass;
+
 struct VirtIOPCIProxy {
     PCIDevice pci_dev;
     VirtIODevice *vdev;
@@ -66,6 +82,9 @@  struct VirtIOPCIProxy {
     bool ioeventfd_disabled;
     bool ioeventfd_started;
     VirtIOIRQFD *vector_irqfd;
+    /* That's the virtio-bus on which VirtioDevice will be connected. */
+    VirtioBusState *bus;
+    /* Nothing more for the moment. */
 };
 
 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev);