[Qemu-devel] [RFC] hw/i386: Composite Bus and PCI device

[David Kiarie <davidkiarie4@gmail.com>]

Sample composite SysBus and PCI device similar to AMD IOMMU setup

Signed-off-by: David Kiarie <davidkiarie4@gmail.com>
---
 hw/i386/compositedevice.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 hw/i386/compositedevice.c

diff --git a/hw/i386/compositedevice.c b/hw/i386/compositedevice.c
new file mode 100644
index 0000000..349e98d
--- /dev/null
+++ b/hw/i386/compositedevice.c
@@ -0,0 +1,113 @@
+#include "qemu/osdep.h"
+#include "hw/pci/pci.h"
+#include "hw/i386/x86-iommu.h"
+#include "hw/pci/msi.h"
+#include "hw/pci/pci_bus.h"
+#include "hw/sysbus.h"
+#include "qom/object.h"
+#include "hw/i386/pc.h"
+
+#define AMDVI_MMIO_SIZE        0x4000
+#define AMDVI_CAPAB_SIZE       0x18
+#define AMDVI_CAPAB_REG_SIZE   0x04
+#define AMDVI_CAPAB_ID_SEC     0xff
+
+#define TYPE_AMD_IOMMU_DEVICE "amd-iommu"
+#define AMD_IOMMU_DEVICE(obj)\
+    OBJECT_CHECK(AMDVIState, (obj), TYPE_AMD_IOMMU_DEVICE)
+
+#define TYPE_AMD_IOMMU_PCI "AMDVI-PCI"
+#define AMD_IOMMU_PCI(obj)\
+    OBJECT_CHECK(AMDVIPCIState, (obj), TYPE_AMD_IOMMU_PCI)
+
+typedef struct AMDVIPCIState {
+    PCIDevice dev;
+    /* PCI specific properties */
+    uint8_t *capab;              /* capabilities registers       */
+    uint32_t capab_offset;       /* capability offset pointer    */
+} AMDVIPCIState;
+
+typedef struct AMDVIState {
+    X86IOMMUState iommu;        /* IOMMU bus device             */
+    AMDVIPCIState *dev;         /* IOMMU PCI device             */
+
+    uint8_t mmior[AMDVI_MMIO_SIZE];    /* read/write MMIO              */
+    uint8_t w1cmask[AMDVI_MMIO_SIZE];  /* read/write 1 clear mask      */
+    uint8_t romask[AMDVI_MMIO_SIZE];   /* MMIO read/only mask          */
+} AMDVIState;
+
+static void amdvi_init(AMDVIState *s)
+{
+    /* reset PCI device */
+    pci_config_set_vendor_id(s->dev->dev.config, PCI_VENDOR_ID_AMD);
+    pci_config_set_prog_interface(s->dev->dev.config, 00);
+    pci_config_set_class(s->dev->dev.config, 0x0806);
+}
+
+static void amdvi_reset(DeviceState *dev)
+{
+    AMDVIState *s = AMD_IOMMU_DEVICE(dev);
+
+    amdvi_init(s);
+}
+
+static void amdvi_realize(DeviceState *dev, Error **errp)
+{
+    AMDVIState *s = AMD_IOMMU_DEVICE(dev);
+    PCIBus *bus = PC_MACHINE(qdev_get_machine())->bus;
+
+    /* This device should take care of IOMMU PCI properties */
+    PCIDevice *createddev = pci_create_simple(bus, -1, TYPE_AMD_IOMMU_PCI);
+    AMDVIPCIState *amdpcidevice = container_of(createddev, AMDVIPCIState, dev);
+    s->dev = amdpcidevice;
+}
+
+static void amdvi_class_init(ObjectClass *klass, void* data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    X86IOMMUClass *dc_class = X86_IOMMU_CLASS(klass);
+
+    dc->reset = amdvi_reset;
+
+    dc_class->realize = amdvi_realize;
+}
+
+static const TypeInfo amdvi = {
+    .name = TYPE_AMD_IOMMU_DEVICE,
+    .parent = TYPE_X86_IOMMU_DEVICE,
+    .instance_size = sizeof(AMDVIState),
+    .class_init = amdvi_class_init
+};
+
+static void amdviPCI_realize(PCIDevice *dev, Error **errp)
+{
+    AMDVIPCIState *s = container_of(dev, AMDVIPCIState, dev);
+
+    /* we need to report certain PCI capabilities */
+    s->capab_offset = pci_add_capability(&s->dev, AMDVI_CAPAB_ID_SEC, 0,
+                                         AMDVI_CAPAB_SIZE);
+    pci_add_capability(&s->dev, PCI_CAP_ID_MSI, 0, AMDVI_CAPAB_REG_SIZE);
+    pci_add_capability(&s->dev, PCI_CAP_ID_HT, 0, AMDVI_CAPAB_REG_SIZE);
+}
+
+static void amdviPCI_class_init(ObjectClass *klass, void* data)
+{
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->realize = amdviPCI_realize;
+}
+
+static const TypeInfo amdviPCI = {
+    .name = TYPE_AMD_IOMMU_PCI,
+    .parent = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(AMDVIPCIState),
+    .class_init = amdviPCI_class_init
+};
+
+static void amdviPCI_register_types(void)
+{
+    type_register_static(&amdviPCI);
+    type_register_static(&amdvi);
+}
+
+type_init(amdviPCI_register_types);
-- 
2.1.4