hw/arm/virt: Add the virtio-iommu device tree mappings

Adds the "virtio,pci-iommu" node in the host bridge node and
the RID mapping, excluding the IOMMU RID.

This is done in the virtio-iommu-pci hotplug handler which
gets called only if no firmware is loaded or if -no-acpi is
passed on the command line. As non DT integration is
not yet supported by the kernel we must make sure we
are in DT mode. This limitation will be removed as soon
as the topology description feature gets supported.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

Message-Id: <20200214132745.23392-10-eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 52 insertions, 7 deletions

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index f788fe2..cfe3179 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -32,6 +32,7 @@
 #include "qemu-common.h"
 #include "qemu/units.h"
 #include "qemu/option.h"
+#include "monitor/qdev.h"
 #include "qapi/error.h"
 #include "hw/sysbus.h"
 #include "hw/boards.h"
@@ -54,6 +55,7 @@
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "hw/pci-host/gpex.h"
+#include "hw/virtio/virtio-pci.h"
 #include "hw/arm/sysbus-fdt.h"
 #include "hw/platform-bus.h"
 #include "hw/qdev-properties.h"
@@ -71,6 +73,7 @@
 #include "hw/mem/pc-dimm.h"
 #include "hw/mem/nvdimm.h"
 #include "hw/acpi/generic_event_device.h"
+#include "hw/virtio/virtio-iommu.h"
 
 #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
     static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
@@ -1180,6 +1183,30 @@ static void create_smmu(const VirtMachineState *vms,
     g_free(node);
 }
 
+static void create_virtio_iommu_dt_bindings(VirtMachineState *vms, Error **errp)
+{
+    const char compat[] = "virtio,pci-iommu";
+    uint16_t bdf = vms->virtio_iommu_bdf;
+    char *node;
+
+    vms->iommu_phandle = qemu_fdt_alloc_phandle(vms->fdt);
+
+    node = g_strdup_printf("%s/virtio_iommu@%d", vms->pciehb_nodename, bdf);
+    qemu_fdt_add_subnode(vms->fdt, node);
+    qemu_fdt_setprop(vms->fdt, node, "compatible", compat, sizeof(compat));
+    qemu_fdt_setprop_sized_cells(vms->fdt, node, "reg",
+                                 1, bdf << 8, 1, 0, 1, 0,
+                                 1, 0, 1, 0);
+
+    qemu_fdt_setprop_cell(vms->fdt, node, "#iommu-cells", 1);
+    qemu_fdt_setprop_cell(vms->fdt, node, "phandle", vms->iommu_phandle);
+    g_free(node);
+
+    qemu_fdt_setprop_cells(vms->fdt, vms->pciehb_nodename, "iommu-map",
+                           0x0, vms->iommu_phandle, 0x0, bdf,
+                           bdf + 1, vms->iommu_phandle, bdf + 1, 0xffff - bdf);
+}
+
 static void create_pcie(VirtMachineState *vms)
 {
     hwaddr base_mmio = vms->memmap[VIRT_PCIE_MMIO].base;
@@ -1258,7 +1285,7 @@ static void create_pcie(VirtMachineState *vms)
         }
     }
 
-    nodename = g_strdup_printf("/pcie@%" PRIx64, base);
+    nodename = vms->pciehb_nodename = g_strdup_printf("/pcie@%" PRIx64, base);
     qemu_fdt_add_subnode(vms->fdt, nodename);
     qemu_fdt_setprop_string(vms->fdt, nodename,
                             "compatible", "pci-host-ecam-generic");
@@ -1301,13 +1328,16 @@ static void create_pcie(VirtMachineState *vms)
     if (vms->iommu) {
         vms->iommu_phandle = qemu_fdt_alloc_phandle(vms->fdt);
 
-        create_smmu(vms, pci->bus);
-
-        qemu_fdt_setprop_cells(vms->fdt, nodename, "iommu-map",
-                               0x0, vms->iommu_phandle, 0x0, 0x10000);
+        switch (vms->iommu) {
+        case VIRT_IOMMU_SMMUV3:
+            create_smmu(vms, pci->bus);
+            qemu_fdt_setprop_cells(vms->fdt, nodename, "iommu-map",
+                                   0x0, vms->iommu_phandle, 0x0, 0x10000);
+            break;
+        default:
+            g_assert_not_reached();
+        }
     }
-
-    g_free(nodename);
 }
 
 static void create_platform_bus(VirtMachineState *vms)
@@ -1976,6 +2006,13 @@ static void virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         virt_memory_plug(hotplug_dev, dev, errp);
     }
+    if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
+        PCIDevice *pdev = PCI_DEVICE(dev);
+
+        vms->iommu = VIRT_IOMMU_VIRTIO;
+        vms->virtio_iommu_bdf = pci_get_bdf(pdev);
+        create_virtio_iommu_dt_bindings(vms, errp);
+    }
 }
 
 static void virt_machine_device_unplug_request_cb(HotplugHandler *hotplug_dev,
@@ -1992,7 +2029,13 @@ static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
        (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM))) {
         return HOTPLUG_HANDLER(machine);
     }
+    if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
+        VirtMachineState *vms = VIRT_MACHINE(machine);
 
+        if (!vms->bootinfo.firmware_loaded || !acpi_enabled) {
+            return HOTPLUG_HANDLER(machine);
+        }
+    }
     return NULL;
 }
 
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 71508bf..02f500c 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -125,8 +125,10 @@ typedef struct {
     bool virt;
     int32_t gic_version;
     VirtIOMMUType iommu;
+    uint16_t virtio_iommu_bdf;
     struct arm_boot_info bootinfo;
     MemMapEntry *memmap;
+    char *pciehb_nodename;
     const int *irqmap;
     int smp_cpus;
     void *fdt;