/*
* microvm device tree support
*
* This generates an device tree for microvm and exports it via fw_cfg
* as "etc/fdt" to the firmware (edk2 specifically).
*
* The use case is to allow edk2 find the pcie ecam and the virtio
* devices, without adding an ACPI parser, reusing the fdt parser
* which is needed anyway for the arm platform.
*
* Note 1: The device tree is incomplete. CPUs and memory is missing
* for example, those can be detected using other fw_cfg files.
* Also pci ecam irq routing is not there, edk2 doesn't use
* interrupts.
*
* Note 2: This is for firmware only. OSes should use the more
* complete ACPI tables for hardware discovery.
*
* ----------------------------------------------------------------------
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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/>.
*/
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "sysemu/device_tree.h"
#include "hw/char/serial.h"
#include "hw/i386/fw_cfg.h"
#include "hw/rtc/mc146818rtc.h"
#include "hw/sysbus.h"
#include "hw/virtio/virtio-mmio.h"
#include "hw/usb/xhci.h"
#include "microvm-dt.h"
static bool debug;
static void dt_add_microvm_irq(MicrovmMachineState *mms,
const char *nodename, uint32_t irq)
{
int index = 0;
if (irq >= IO_APIC_SECONDARY_IRQBASE) {
irq -= IO_APIC_SECONDARY_IRQBASE;
index++;
}
qemu_fdt_setprop_cell(mms->fdt, nodename, "interrupt-parent",
mms->ioapic_phandle[index]);
qemu_fdt_setprop_cells(mms->fdt, nodename, "interrupts", irq, 0);
}
static void dt_add_virtio(MicrovmMachineState *mms, VirtIOMMIOProxy *mmio)
{
SysBusDevice *dev = SYS_BUS_DEVICE(mmio);
VirtioBusState *mmio_virtio_bus = &mmio->bus;
BusState *mmio_bus = &mmio_virtio_bus->parent_obj;
char *nodename;
if (QTAILQ_EMPTY(&mmio_bus->children)) {
return;
}
hwaddr base = dev->mmio[0].addr;
hwaddr size = 512;
unsigned index = (base - VIRTIO_MMIO_BASE) / size;
uint32_t irq = mms->virtio_irq_base + index;
nodename = g_strdup_printf("/virtio_mmio@%" PRIx64, base);
qemu_fdt_add_subnode(mms->fdt, nodename);
qemu_fdt_setprop_string(mms->fdt, nodename, "compatible", "virtio,mmio");
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size);
qemu_fdt_setprop(mms->fdt, nodename, "dma-coherent", NULL, 0);
dt_add_microvm_irq(mms, nodename, irq);
g_free(nodename);
}
static void dt_add_xhci(MicrovmMachineState *mms)
{
const char compat[] = "generic-xhci";
uint32_t irq = MICROVM_XHCI_IRQ;
hwaddr base = MICROVM_XHCI_BASE;
hwaddr size = XHCI_LEN_REGS;
char *nodename;
nodename = g_strdup_printf("/usb@%" PRIx64, base);
qemu_fdt_add_subnode(mms->fdt, nodename);
qemu_fdt_setprop(mms->fdt, nodename, "compatible", compat, sizeof(compat));
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size);
qemu_fdt_setprop(mms->fdt, nodename, "dma-coherent", NULL, 0);
dt_add_microvm_irq(mms, nodename, irq);
g_free(nodename);
}
static void dt_add_pcie(MicrovmMachineState *mms)
{
hwaddr base = PCIE_MMIO_BASE;
int nr_pcie_buses;
char *nodename;
nodename = g_strdup_printf("/pcie@%" PRIx64, base);
qemu_fdt_add_subnode(mms->fdt, nodename);
qemu_fdt_setprop_string(mms->fdt, nodename,
"compatible", "pci-host-ecam-generic");
qemu_fdt_setprop_string(mms->fdt, nodename, "device_type", "pci");
qemu_fdt_setprop_cell(mms->fdt, nodename, "#address-cells", 3);
qemu_fdt_setprop_cell(mms->fdt, nodename, "#size-cells", 2);
qemu_fdt_setprop_cell(mms->fdt, nodename, "linux,pci-domain", 0);
qemu_fdt_setprop(mms->fdt, nodename, "dma-coherent", NULL, 0);
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg",
2, PCIE_ECAM_BASE, 2, PCIE_ECAM_SIZE);
if (mms->gpex.mmio64.size) {
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "ranges",
1, FDT_PCI_RANGE_MMIO,
2, mms->gpex.mmio32.base,
2, mms->gpex.mmio32.base,
2, mms->gpex.mmio32.size,
1, FDT_PCI_RANGE_MMIO_64BIT,
2, mms->gpex.mmio64.base,
2, mms->gpex.mmio64.base,
2, mms->gpex.mmio64.size);
} else {
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "ranges",
1, FDT_PCI_RANGE_MMIO,
2, mms->gpex.mmio32.base,
2, mms->gpex.mmio32.base,
2, mms->gpex.mmio32.size);
}
nr_pcie_buses = PCIE_ECAM_SIZE / PCIE_MMCFG_SIZE_MIN;
qemu_fdt_setprop_cells(mms->fdt, nodename, "bus-range", 0,
nr_pcie_buses - 1);
g_free(nodename);
}
static void dt_add_ioapic(MicrovmMachineState *mms, SysBusDevice *dev)
{
hwaddr base = dev->mmio[0].addr;
char *nodename;
uint32_t ph;
int index;
switch (base) {
case IO_APIC_DEFAULT_ADDRESS:
index = 0;
break;
case IO_APIC_SECONDARY_ADDRESS:
index = 1;
break;
default:
fprintf(stderr, "unknown ioapic @ %" PRIx64 "\n", base);
return;
}
nodename = g_strdup_printf("/ioapic%d@%" PRIx64, index + 1, base);
qemu_fdt_add_subnode(mms->fdt, nodename);
qemu_fdt_setprop_string(mms->fdt, nodename,
"compatible", "intel,ce4100-ioapic");
qemu_fdt_setprop(mms->fdt, nodename, "interrupt-controller", NULL, 0);
qemu_fdt_setprop_cell(mms->fdt, nodename, "#interrupt-cells", 0x2);
qemu_fdt_setprop_cell(mms->fdt, nodename, "#address-cells", 0x2);
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg",
2, base, 2, 0x1000);
ph = qemu_fdt_alloc_phandle(mms->fdt);
qemu_fdt_setprop_cell(mms->fdt, nodename, "phandle", ph);
qemu_fdt_setprop_cell(mms->fdt, nodename, "linux,phandle", ph);
mms->ioapic_phandle[index] = ph;
g_free(nodename);
}
static void dt_add_isa_serial(MicrovmMachineState *mms, ISADevice *dev)
{
const char compat[] = "ns16550";
uint32_t irq = object_property_get_int(OBJECT(dev), "irq", NULL);
hwaddr base = object_property_get_int(OBJECT(dev), "iobase", NULL);
hwaddr size = 8;
char *nodename;
nodename = g_strdup_printf("/serial@%" PRIx64, base);
qemu_fdt_add_subnode(mms->fdt, nodename);
qemu_fdt_setprop(mms->fdt, nodename, "compatible", compat, sizeof(compat));
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size);
dt_add_microvm_irq(mms, nodename, irq);
if (base == 0x3f8 /* com1 */) {
qemu_fdt_setprop_string(mms->fdt, "/chosen", "stdout-path", nodename);
}
g_free(nodename);
}
static void dt_add_isa_rtc(MicrovmMachineState *mms, ISADevice *dev)
{
const char compat[] = "motorola,mc146818";
uint32_t irq = RTC_ISA_IRQ;
hwaddr base = RTC_ISA_BASE;
hwaddr size = 8;
char *nodename;
nodename = g_strdup_printf("/rtc@%" PRIx64, base);
qemu_fdt_add_subnode(mms->fdt, nodename);
qemu_fdt_setprop(mms->fdt, nodename, "compatible", compat, sizeof(compat));
qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size);
dt_add_microvm_irq(mms, nodename, irq);
g_free(nodename);
}
static void dt_setup_isa_bus(MicrovmMachineState *mms, DeviceState *bridge)
{
BusState *bus = qdev_get_child_bus(bridge, "isa.0");
BusChild *kid;
Object *obj;
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
/* serial */
obj = object_dynamic_cast(OBJECT(dev), TYPE_ISA_SERIAL);
if (obj) {
dt_add_isa_serial(mms, ISA_DEVICE(obj));
continue;
}
/* rtc */
obj = object_dynamic_cast(OBJECT(dev), TYPE_MC146818_RTC);
if (obj) {
dt_add_isa_rtc(mms, ISA_DEVICE(obj));
continue;
}
if (debug) {
fprintf(stderr, "%s: unhandled: %s\n", __func__,
object_get_typename(OBJECT(dev)));
}
}
}
static void dt_setup_sys_bus(MicrovmMachineState *mms)
{
BusState *bus;
BusChild *kid;
Object *obj;
/* sysbus devices */
bus = sysbus_get_default();
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
/* ioapic */
obj = object_dynamic_cast(OBJECT(dev), TYPE_IOAPIC);
if (obj) {
dt_add_ioapic(mms, SYS_BUS_DEVICE(obj));
continue;
}
}
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
/* virtio */
obj = object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MMIO);
if (obj) {
dt_add_virtio(mms, VIRTIO_MMIO(obj));
continue;
}
/* xhci */
obj = object_dynamic_cast(OBJECT(dev), TYPE_XHCI_SYSBUS);
if (obj) {
dt_add_xhci(mms);
continue;
}
/* pcie */
obj = object_dynamic_cast(OBJECT(dev), TYPE_GPEX_HOST);
if (obj) {
dt_add_pcie(mms);
continue;
}
/* isa */
obj = object_dynamic_cast(OBJECT(dev), "isabus-bridge");
if (obj) {
dt_setup_isa_bus(mms, DEVICE(obj));
continue;
}
if (debug) {
obj = object_dynamic_cast(OBJECT(dev), TYPE_IOAPIC);
if (obj) {
/* ioapic already added in first pass */
continue;
}
fprintf(stderr, "%s: unhandled: %s\n", __func__,
object_get_typename(OBJECT(dev)));
}
}
}
void dt_setup_microvm(MicrovmMachineState *mms)
{
X86MachineState *x86ms = X86_MACHINE(mms);
int size = 0;
mms->fdt = create_device_tree(&size);
/* root node */
qemu_fdt_setprop_string(mms->fdt, "/", "compatible", "linux,microvm");
qemu_fdt_setprop_cell(mms->fdt, "/", "#address-cells", 0x2);
qemu_fdt_setprop_cell(mms->fdt, "/", "#size-cells", 0x2);
qemu_fdt_add_subnode(mms->fdt, "/chosen");
dt_setup_sys_bus(mms);
/* add to fw_cfg */
if (debug) {
fprintf(stderr, "%s: add etc/fdt to fw_cfg\n", __func__);
}
fw_cfg_add_file(x86ms->fw_cfg, "etc/fdt", mms->fdt, size);
if (debug) {
fprintf(stderr, "%s: writing microvm.fdt\n", __func__);
if (!g_file_set_contents("microvm.fdt", mms->fdt, size, NULL)) {
fprintf(stderr, "%s: writing microvm.fdt failed\n", __func__);
return;
}
int ret = system("dtc -I dtb -O dts microvm.fdt");
if (ret != 0) {
fprintf(stderr, "%s: oops, dtc not installed?\n", __func__);
}
}
}
