microvm-dt.c (11713B)
1 /* 2 * microvm device tree support 3 * 4 * This generates an device tree for microvm and exports it via fw_cfg 5 * as "etc/fdt" to the firmware (edk2 specifically). 6 * 7 * The use case is to allow edk2 find the pcie ecam and the virtio 8 * devices, without adding an ACPI parser, reusing the fdt parser 9 * which is needed anyway for the arm platform. 10 * 11 * Note 1: The device tree is incomplete. CPUs and memory is missing 12 * for example, those can be detected using other fw_cfg files. 13 * Also pci ecam irq routing is not there, edk2 doesn't use 14 * interrupts. 15 * 16 * Note 2: This is for firmware only. OSes should use the more 17 * complete ACPI tables for hardware discovery. 18 * 19 * ---------------------------------------------------------------------- 20 * 21 * This program is free software; you can redistribute it and/or modify it 22 * under the terms and conditions of the GNU General Public License, 23 * version 2 or later, as published by the Free Software Foundation. 24 * 25 * This program is distributed in the hope it will be useful, but WITHOUT 26 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 27 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 28 * more details. 29 * 30 * You should have received a copy of the GNU General Public License along with 31 * this program. If not, see <http://www.gnu.org/licenses/>. 32 */ 33 #include "qemu/osdep.h" 34 #include "qemu/cutils.h" 35 #include "qapi/error.h" 36 #include "sysemu/device_tree.h" 37 #include "hw/char/serial.h" 38 #include "hw/i386/fw_cfg.h" 39 #include "hw/rtc/mc146818rtc.h" 40 #include "hw/sysbus.h" 41 #include "hw/virtio/virtio-mmio.h" 42 #include "hw/usb/xhci.h" 43 44 #include "microvm-dt.h" 45 46 static bool debug; 47 48 static void dt_add_microvm_irq(MicrovmMachineState *mms, 49 const char *nodename, uint32_t irq) 50 { 51 int index = 0; 52 53 if (irq >= IO_APIC_SECONDARY_IRQBASE) { 54 irq -= IO_APIC_SECONDARY_IRQBASE; 55 index++; 56 } 57 58 qemu_fdt_setprop_cell(mms->fdt, nodename, "interrupt-parent", 59 mms->ioapic_phandle[index]); 60 qemu_fdt_setprop_cells(mms->fdt, nodename, "interrupts", irq, 0); 61 } 62 63 static void dt_add_virtio(MicrovmMachineState *mms, VirtIOMMIOProxy *mmio) 64 { 65 SysBusDevice *dev = SYS_BUS_DEVICE(mmio); 66 VirtioBusState *mmio_virtio_bus = &mmio->bus; 67 BusState *mmio_bus = &mmio_virtio_bus->parent_obj; 68 char *nodename; 69 70 if (QTAILQ_EMPTY(&mmio_bus->children)) { 71 return; 72 } 73 74 hwaddr base = dev->mmio[0].addr; 75 hwaddr size = 512; 76 unsigned index = (base - VIRTIO_MMIO_BASE) / size; 77 uint32_t irq = mms->virtio_irq_base + index; 78 79 nodename = g_strdup_printf("/virtio_mmio@%" PRIx64, base); 80 qemu_fdt_add_subnode(mms->fdt, nodename); 81 qemu_fdt_setprop_string(mms->fdt, nodename, "compatible", "virtio,mmio"); 82 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size); 83 qemu_fdt_setprop(mms->fdt, nodename, "dma-coherent", NULL, 0); 84 dt_add_microvm_irq(mms, nodename, irq); 85 g_free(nodename); 86 } 87 88 static void dt_add_xhci(MicrovmMachineState *mms) 89 { 90 const char compat[] = "generic-xhci"; 91 uint32_t irq = MICROVM_XHCI_IRQ; 92 hwaddr base = MICROVM_XHCI_BASE; 93 hwaddr size = XHCI_LEN_REGS; 94 char *nodename; 95 96 nodename = g_strdup_printf("/usb@%" PRIx64, base); 97 qemu_fdt_add_subnode(mms->fdt, nodename); 98 qemu_fdt_setprop(mms->fdt, nodename, "compatible", compat, sizeof(compat)); 99 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size); 100 qemu_fdt_setprop(mms->fdt, nodename, "dma-coherent", NULL, 0); 101 dt_add_microvm_irq(mms, nodename, irq); 102 g_free(nodename); 103 } 104 105 static void dt_add_pcie(MicrovmMachineState *mms) 106 { 107 hwaddr base = PCIE_MMIO_BASE; 108 int nr_pcie_buses; 109 char *nodename; 110 111 nodename = g_strdup_printf("/pcie@%" PRIx64, base); 112 qemu_fdt_add_subnode(mms->fdt, nodename); 113 qemu_fdt_setprop_string(mms->fdt, nodename, 114 "compatible", "pci-host-ecam-generic"); 115 qemu_fdt_setprop_string(mms->fdt, nodename, "device_type", "pci"); 116 qemu_fdt_setprop_cell(mms->fdt, nodename, "#address-cells", 3); 117 qemu_fdt_setprop_cell(mms->fdt, nodename, "#size-cells", 2); 118 qemu_fdt_setprop_cell(mms->fdt, nodename, "linux,pci-domain", 0); 119 qemu_fdt_setprop(mms->fdt, nodename, "dma-coherent", NULL, 0); 120 121 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 122 2, PCIE_ECAM_BASE, 2, PCIE_ECAM_SIZE); 123 if (mms->gpex.mmio64.size) { 124 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "ranges", 125 126 1, FDT_PCI_RANGE_MMIO, 127 2, mms->gpex.mmio32.base, 128 2, mms->gpex.mmio32.base, 129 2, mms->gpex.mmio32.size, 130 131 1, FDT_PCI_RANGE_MMIO_64BIT, 132 2, mms->gpex.mmio64.base, 133 2, mms->gpex.mmio64.base, 134 2, mms->gpex.mmio64.size); 135 } else { 136 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "ranges", 137 138 1, FDT_PCI_RANGE_MMIO, 139 2, mms->gpex.mmio32.base, 140 2, mms->gpex.mmio32.base, 141 2, mms->gpex.mmio32.size); 142 } 143 144 nr_pcie_buses = PCIE_ECAM_SIZE / PCIE_MMCFG_SIZE_MIN; 145 qemu_fdt_setprop_cells(mms->fdt, nodename, "bus-range", 0, 146 nr_pcie_buses - 1); 147 148 g_free(nodename); 149 } 150 151 static void dt_add_ioapic(MicrovmMachineState *mms, SysBusDevice *dev) 152 { 153 hwaddr base = dev->mmio[0].addr; 154 char *nodename; 155 uint32_t ph; 156 int index; 157 158 switch (base) { 159 case IO_APIC_DEFAULT_ADDRESS: 160 index = 0; 161 break; 162 case IO_APIC_SECONDARY_ADDRESS: 163 index = 1; 164 break; 165 default: 166 fprintf(stderr, "unknown ioapic @ %" PRIx64 "\n", base); 167 return; 168 } 169 170 nodename = g_strdup_printf("/ioapic%d@%" PRIx64, index + 1, base); 171 qemu_fdt_add_subnode(mms->fdt, nodename); 172 qemu_fdt_setprop_string(mms->fdt, nodename, 173 "compatible", "intel,ce4100-ioapic"); 174 qemu_fdt_setprop(mms->fdt, nodename, "interrupt-controller", NULL, 0); 175 qemu_fdt_setprop_cell(mms->fdt, nodename, "#interrupt-cells", 0x2); 176 qemu_fdt_setprop_cell(mms->fdt, nodename, "#address-cells", 0x2); 177 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 178 2, base, 2, 0x1000); 179 180 ph = qemu_fdt_alloc_phandle(mms->fdt); 181 qemu_fdt_setprop_cell(mms->fdt, nodename, "phandle", ph); 182 qemu_fdt_setprop_cell(mms->fdt, nodename, "linux,phandle", ph); 183 mms->ioapic_phandle[index] = ph; 184 185 g_free(nodename); 186 } 187 188 static void dt_add_isa_serial(MicrovmMachineState *mms, ISADevice *dev) 189 { 190 const char compat[] = "ns16550"; 191 uint32_t irq = object_property_get_int(OBJECT(dev), "irq", &error_fatal); 192 hwaddr base = object_property_get_int(OBJECT(dev), "iobase", &error_fatal); 193 hwaddr size = 8; 194 char *nodename; 195 196 nodename = g_strdup_printf("/serial@%" PRIx64, base); 197 qemu_fdt_add_subnode(mms->fdt, nodename); 198 qemu_fdt_setprop(mms->fdt, nodename, "compatible", compat, sizeof(compat)); 199 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size); 200 dt_add_microvm_irq(mms, nodename, irq); 201 202 if (base == 0x3f8 /* com1 */) { 203 qemu_fdt_setprop_string(mms->fdt, "/chosen", "stdout-path", nodename); 204 } 205 206 g_free(nodename); 207 } 208 209 static void dt_add_isa_rtc(MicrovmMachineState *mms, ISADevice *dev) 210 { 211 const char compat[] = "motorola,mc146818"; 212 uint32_t irq = object_property_get_uint(OBJECT(dev), "irq", &error_fatal); 213 hwaddr base = object_property_get_uint(OBJECT(dev), "iobase", &error_fatal); 214 hwaddr size = 8; 215 char *nodename; 216 217 nodename = g_strdup_printf("/rtc@%" PRIx64, base); 218 qemu_fdt_add_subnode(mms->fdt, nodename); 219 qemu_fdt_setprop(mms->fdt, nodename, "compatible", compat, sizeof(compat)); 220 qemu_fdt_setprop_sized_cells(mms->fdt, nodename, "reg", 2, base, 2, size); 221 dt_add_microvm_irq(mms, nodename, irq); 222 g_free(nodename); 223 } 224 225 static void dt_setup_isa_bus(MicrovmMachineState *mms, DeviceState *bridge) 226 { 227 BusState *bus = qdev_get_child_bus(bridge, "isa.0"); 228 BusChild *kid; 229 Object *obj; 230 231 QTAILQ_FOREACH(kid, &bus->children, sibling) { 232 DeviceState *dev = kid->child; 233 234 /* serial */ 235 obj = object_dynamic_cast(OBJECT(dev), TYPE_ISA_SERIAL); 236 if (obj) { 237 dt_add_isa_serial(mms, ISA_DEVICE(obj)); 238 continue; 239 } 240 241 /* rtc */ 242 obj = object_dynamic_cast(OBJECT(dev), TYPE_MC146818_RTC); 243 if (obj) { 244 dt_add_isa_rtc(mms, ISA_DEVICE(obj)); 245 continue; 246 } 247 248 if (debug) { 249 fprintf(stderr, "%s: unhandled: %s\n", __func__, 250 object_get_typename(OBJECT(dev))); 251 } 252 } 253 } 254 255 static void dt_setup_sys_bus(MicrovmMachineState *mms) 256 { 257 BusState *bus; 258 BusChild *kid; 259 Object *obj; 260 261 /* sysbus devices */ 262 bus = sysbus_get_default(); 263 QTAILQ_FOREACH(kid, &bus->children, sibling) { 264 DeviceState *dev = kid->child; 265 266 /* ioapic */ 267 obj = object_dynamic_cast(OBJECT(dev), TYPE_IOAPIC); 268 if (obj) { 269 dt_add_ioapic(mms, SYS_BUS_DEVICE(obj)); 270 continue; 271 } 272 } 273 274 QTAILQ_FOREACH(kid, &bus->children, sibling) { 275 DeviceState *dev = kid->child; 276 277 /* virtio */ 278 obj = object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MMIO); 279 if (obj) { 280 dt_add_virtio(mms, VIRTIO_MMIO(obj)); 281 continue; 282 } 283 284 /* xhci */ 285 obj = object_dynamic_cast(OBJECT(dev), TYPE_XHCI_SYSBUS); 286 if (obj) { 287 dt_add_xhci(mms); 288 continue; 289 } 290 291 /* pcie */ 292 obj = object_dynamic_cast(OBJECT(dev), TYPE_GPEX_HOST); 293 if (obj) { 294 dt_add_pcie(mms); 295 continue; 296 } 297 298 /* isa */ 299 obj = object_dynamic_cast(OBJECT(dev), "isabus-bridge"); 300 if (obj) { 301 dt_setup_isa_bus(mms, DEVICE(obj)); 302 continue; 303 } 304 305 if (debug) { 306 obj = object_dynamic_cast(OBJECT(dev), TYPE_IOAPIC); 307 if (obj) { 308 /* ioapic already added in first pass */ 309 continue; 310 } 311 fprintf(stderr, "%s: unhandled: %s\n", __func__, 312 object_get_typename(OBJECT(dev))); 313 } 314 } 315 } 316 317 void dt_setup_microvm(MicrovmMachineState *mms) 318 { 319 X86MachineState *x86ms = X86_MACHINE(mms); 320 int size = 0; 321 322 mms->fdt = create_device_tree(&size); 323 324 /* root node */ 325 qemu_fdt_setprop_string(mms->fdt, "/", "compatible", "linux,microvm"); 326 qemu_fdt_setprop_cell(mms->fdt, "/", "#address-cells", 0x2); 327 qemu_fdt_setprop_cell(mms->fdt, "/", "#size-cells", 0x2); 328 329 qemu_fdt_add_subnode(mms->fdt, "/chosen"); 330 dt_setup_sys_bus(mms); 331 332 /* add to fw_cfg */ 333 if (debug) { 334 fprintf(stderr, "%s: add etc/fdt to fw_cfg\n", __func__); 335 } 336 fw_cfg_add_file(x86ms->fw_cfg, "etc/fdt", mms->fdt, size); 337 338 if (debug) { 339 fprintf(stderr, "%s: writing microvm.fdt\n", __func__); 340 if (!g_file_set_contents("microvm.fdt", mms->fdt, size, NULL)) { 341 fprintf(stderr, "%s: writing microvm.fdt failed\n", __func__); 342 return; 343 } 344 int ret = system("dtc -I dtb -O dts microvm.fdt"); 345 if (ret != 0) { 346 fprintf(stderr, "%s: oops, dtc not installed?\n", __func__); 347 } 348 } 349 }