1 /* 2 * QEMU sPAPR VIO code 3 * 4 * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com> 5 * Based on the s390 virtio bus code: 6 * Copyright (c) 2009 Alexander Graf <agraf@suse.de> 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "hw/hw.h" 23 #include "sysemu/sysemu.h" 24 #include "hw/boards.h" 25 #include "monitor/monitor.h" 26 #include "hw/loader.h" 27 #include "elf.h" 28 #include "hw/sysbus.h" 29 #include "sysemu/kvm.h" 30 #include "sysemu/device_tree.h" 31 #include "kvm_ppc.h" 32 33 #include "hw/ppc/spapr.h" 34 #include "hw/ppc/spapr_vio.h" 35 #include "hw/ppc/xics.h" 36 37 #include <libfdt.h> 38 39 /* #define DEBUG_SPAPR */ 40 41 #ifdef DEBUG_SPAPR 42 #define DPRINTF(fmt, ...) \ 43 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) 44 #else 45 #define DPRINTF(fmt, ...) \ 46 do { } while (0) 47 #endif 48 49 static Property spapr_vio_props[] = { 50 DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \ 51 DEFINE_PROP_END_OF_LIST(), 52 }; 53 54 static char *spapr_vio_get_dev_name(DeviceState *qdev) 55 { 56 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev); 57 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 58 char *name; 59 60 /* Device tree style name device@reg */ 61 name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg); 62 63 return name; 64 } 65 66 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data) 67 { 68 BusClass *k = BUS_CLASS(klass); 69 70 k->get_dev_path = spapr_vio_get_dev_name; 71 k->get_fw_dev_path = spapr_vio_get_dev_name; 72 } 73 74 static const TypeInfo spapr_vio_bus_info = { 75 .name = TYPE_SPAPR_VIO_BUS, 76 .parent = TYPE_BUS, 77 .class_init = spapr_vio_bus_class_init, 78 .instance_size = sizeof(VIOsPAPRBus), 79 }; 80 81 VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg) 82 { 83 BusChild *kid; 84 VIOsPAPRDevice *dev = NULL; 85 86 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 87 dev = (VIOsPAPRDevice *)kid->child; 88 if (dev->reg == reg) { 89 return dev; 90 } 91 } 92 93 return NULL; 94 } 95 96 static int vio_make_devnode(VIOsPAPRDevice *dev, 97 void *fdt) 98 { 99 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 100 int vdevice_off, node_off, ret; 101 char *dt_name; 102 103 vdevice_off = fdt_path_offset(fdt, "/vdevice"); 104 if (vdevice_off < 0) { 105 return vdevice_off; 106 } 107 108 dt_name = spapr_vio_get_dev_name(DEVICE(dev)); 109 node_off = fdt_add_subnode(fdt, vdevice_off, dt_name); 110 g_free(dt_name); 111 if (node_off < 0) { 112 return node_off; 113 } 114 115 ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg); 116 if (ret < 0) { 117 return ret; 118 } 119 120 if (pc->dt_type) { 121 ret = fdt_setprop_string(fdt, node_off, "device_type", 122 pc->dt_type); 123 if (ret < 0) { 124 return ret; 125 } 126 } 127 128 if (pc->dt_compatible) { 129 ret = fdt_setprop_string(fdt, node_off, "compatible", 130 pc->dt_compatible); 131 if (ret < 0) { 132 return ret; 133 } 134 } 135 136 if (dev->irq) { 137 uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0}; 138 139 ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop, 140 sizeof(ints_prop)); 141 if (ret < 0) { 142 return ret; 143 } 144 } 145 146 ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet); 147 if (ret < 0) { 148 return ret; 149 } 150 151 if (pc->devnode) { 152 ret = (pc->devnode)(dev, fdt, node_off); 153 if (ret < 0) { 154 return ret; 155 } 156 } 157 158 return node_off; 159 } 160 161 /* 162 * CRQ handling 163 */ 164 static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr, 165 target_ulong opcode, target_ulong *args) 166 { 167 target_ulong reg = args[0]; 168 target_ulong queue_addr = args[1]; 169 target_ulong queue_len = args[2]; 170 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 171 172 if (!dev) { 173 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 174 return H_PARAMETER; 175 } 176 177 /* We can't grok a queue size bigger than 256M for now */ 178 if (queue_len < 0x1000 || queue_len > 0x10000000) { 179 hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx 180 ")\n", queue_len); 181 return H_PARAMETER; 182 } 183 184 /* Check queue alignment */ 185 if (queue_addr & 0xfff) { 186 hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr); 187 return H_PARAMETER; 188 } 189 190 /* Check if device supports CRQs */ 191 if (!dev->crq.SendFunc) { 192 hcall_dprintf("Device does not support CRQ\n"); 193 return H_NOT_FOUND; 194 } 195 196 /* Already a queue ? */ 197 if (dev->crq.qsize) { 198 hcall_dprintf("CRQ already registered\n"); 199 return H_RESOURCE; 200 } 201 dev->crq.qladdr = queue_addr; 202 dev->crq.qsize = queue_len; 203 dev->crq.qnext = 0; 204 205 DPRINTF("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x" 206 TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n", 207 reg, queue_addr, queue_len); 208 return H_SUCCESS; 209 } 210 211 static target_ulong free_crq(VIOsPAPRDevice *dev) 212 { 213 dev->crq.qladdr = 0; 214 dev->crq.qsize = 0; 215 dev->crq.qnext = 0; 216 217 DPRINTF("CRQ for dev 0x%" PRIx32 " freed\n", dev->reg); 218 219 return H_SUCCESS; 220 } 221 222 static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr, 223 target_ulong opcode, target_ulong *args) 224 { 225 target_ulong reg = args[0]; 226 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 227 228 if (!dev) { 229 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 230 return H_PARAMETER; 231 } 232 233 return free_crq(dev); 234 } 235 236 static target_ulong h_send_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr, 237 target_ulong opcode, target_ulong *args) 238 { 239 target_ulong reg = args[0]; 240 target_ulong msg_hi = args[1]; 241 target_ulong msg_lo = args[2]; 242 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 243 uint64_t crq_mangle[2]; 244 245 if (!dev) { 246 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 247 return H_PARAMETER; 248 } 249 crq_mangle[0] = cpu_to_be64(msg_hi); 250 crq_mangle[1] = cpu_to_be64(msg_lo); 251 252 if (dev->crq.SendFunc) { 253 return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle); 254 } 255 256 return H_HARDWARE; 257 } 258 259 static target_ulong h_enable_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr, 260 target_ulong opcode, target_ulong *args) 261 { 262 target_ulong reg = args[0]; 263 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 264 265 if (!dev) { 266 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 267 return H_PARAMETER; 268 } 269 270 return 0; 271 } 272 273 /* Returns negative error, 0 success, or positive: queue full */ 274 int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq) 275 { 276 int rc; 277 uint8_t byte; 278 279 if (!dev->crq.qsize) { 280 fprintf(stderr, "spapr_vio_send_creq on uninitialized queue\n"); 281 return -1; 282 } 283 284 /* Maybe do a fast path for KVM just writing to the pages */ 285 rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1); 286 if (rc) { 287 return rc; 288 } 289 if (byte != 0) { 290 return 1; 291 } 292 293 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8, 294 &crq[8], 8); 295 if (rc) { 296 return rc; 297 } 298 299 kvmppc_eieio(); 300 301 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8); 302 if (rc) { 303 return rc; 304 } 305 306 dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize; 307 308 if (dev->signal_state & 1) { 309 qemu_irq_pulse(spapr_vio_qirq(dev)); 310 } 311 312 return 0; 313 } 314 315 /* "quiesce" handling */ 316 317 static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev) 318 { 319 if (dev->tcet) { 320 device_reset(DEVICE(dev->tcet)); 321 } 322 free_crq(dev); 323 } 324 325 static void rtas_set_tce_bypass(PowerPCCPU *cpu, sPAPREnvironment *spapr, 326 uint32_t token, 327 uint32_t nargs, target_ulong args, 328 uint32_t nret, target_ulong rets) 329 { 330 VIOsPAPRBus *bus = spapr->vio_bus; 331 VIOsPAPRDevice *dev; 332 uint32_t unit, enable; 333 334 if (nargs != 2) { 335 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 336 return; 337 } 338 unit = rtas_ld(args, 0); 339 enable = rtas_ld(args, 1); 340 dev = spapr_vio_find_by_reg(bus, unit); 341 if (!dev) { 342 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 343 return; 344 } 345 346 if (!dev->tcet) { 347 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 348 return; 349 } 350 351 spapr_tce_set_bypass(dev->tcet, !!enable); 352 353 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 354 } 355 356 static void rtas_quiesce(PowerPCCPU *cpu, sPAPREnvironment *spapr, 357 uint32_t token, 358 uint32_t nargs, target_ulong args, 359 uint32_t nret, target_ulong rets) 360 { 361 VIOsPAPRBus *bus = spapr->vio_bus; 362 BusChild *kid; 363 VIOsPAPRDevice *dev = NULL; 364 365 if (nargs != 0) { 366 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 367 return; 368 } 369 370 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 371 dev = (VIOsPAPRDevice *)kid->child; 372 spapr_vio_quiesce_one(dev); 373 } 374 375 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 376 } 377 378 static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev) 379 { 380 VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus); 381 BusChild *kid; 382 VIOsPAPRDevice *other; 383 384 /* 385 * Check for a device other than the given one which is already 386 * using the requested address. We have to open code this because 387 * the given dev might already be in the list. 388 */ 389 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 390 other = VIO_SPAPR_DEVICE(kid->child); 391 392 if (other != dev && other->reg == dev->reg) { 393 return other; 394 } 395 } 396 397 return 0; 398 } 399 400 static void spapr_vio_busdev_reset(DeviceState *qdev) 401 { 402 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev); 403 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 404 405 /* Shut down the request queue and TCEs if necessary */ 406 spapr_vio_quiesce_one(dev); 407 408 dev->signal_state = 0; 409 410 if (pc->reset) { 411 pc->reset(dev); 412 } 413 } 414 415 static int spapr_vio_busdev_init(DeviceState *qdev) 416 { 417 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev; 418 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 419 char *id; 420 421 if (dev->reg != -1) { 422 /* 423 * Explicitly assigned address, just verify that no-one else 424 * is using it. other mechanism). We have to open code this 425 * rather than using spapr_vio_find_by_reg() because sdev 426 * itself is already in the list. 427 */ 428 VIOsPAPRDevice *other = reg_conflict(dev); 429 430 if (other) { 431 fprintf(stderr, "vio: %s and %s devices conflict at address %#x\n", 432 object_get_typename(OBJECT(qdev)), 433 object_get_typename(OBJECT(&other->qdev)), 434 dev->reg); 435 return -1; 436 } 437 } else { 438 /* Need to assign an address */ 439 VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus); 440 441 do { 442 dev->reg = bus->next_reg++; 443 } while (reg_conflict(dev)); 444 } 445 446 /* Don't overwrite ids assigned on the command line */ 447 if (!dev->qdev.id) { 448 id = spapr_vio_get_dev_name(DEVICE(dev)); 449 dev->qdev.id = id; 450 } 451 452 dev->irq = spapr_allocate_msi(dev->irq); 453 if (!dev->irq) { 454 return -1; 455 } 456 457 if (pc->rtce_window_size) { 458 uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg; 459 dev->tcet = spapr_tce_new_table(qdev, liobn, pc->rtce_window_size); 460 address_space_init(&dev->as, spapr_tce_get_iommu(dev->tcet), qdev->id); 461 } 462 463 return pc->init(dev); 464 } 465 466 static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPREnvironment *spapr, 467 target_ulong opcode, 468 target_ulong *args) 469 { 470 target_ulong reg = args[0]; 471 target_ulong mode = args[1]; 472 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 473 VIOsPAPRDeviceClass *pc; 474 475 if (!dev) { 476 return H_PARAMETER; 477 } 478 479 pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 480 481 if (mode & ~pc->signal_mask) { 482 return H_PARAMETER; 483 } 484 485 dev->signal_state = mode; 486 487 return H_SUCCESS; 488 } 489 490 VIOsPAPRBus *spapr_vio_bus_init(void) 491 { 492 VIOsPAPRBus *bus; 493 BusState *qbus; 494 DeviceState *dev; 495 496 /* Create bridge device */ 497 dev = qdev_create(NULL, "spapr-vio-bridge"); 498 qdev_init_nofail(dev); 499 500 /* Create bus on bridge device */ 501 502 qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio"); 503 bus = DO_UPCAST(VIOsPAPRBus, bus, qbus); 504 bus->next_reg = 0x71000000; 505 506 /* hcall-vio */ 507 spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal); 508 509 /* hcall-crq */ 510 spapr_register_hypercall(H_REG_CRQ, h_reg_crq); 511 spapr_register_hypercall(H_FREE_CRQ, h_free_crq); 512 spapr_register_hypercall(H_SEND_CRQ, h_send_crq); 513 spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq); 514 515 /* RTAS calls */ 516 spapr_rtas_register("ibm,set-tce-bypass", rtas_set_tce_bypass); 517 spapr_rtas_register("quiesce", rtas_quiesce); 518 519 return bus; 520 } 521 522 /* Represents sPAPR hcall VIO devices */ 523 524 static int spapr_vio_bridge_init(SysBusDevice *dev) 525 { 526 /* nothing */ 527 return 0; 528 } 529 530 static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data) 531 { 532 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 533 DeviceClass *dc = DEVICE_CLASS(klass); 534 535 dc->fw_name = "vdevice"; 536 k->init = spapr_vio_bridge_init; 537 } 538 539 static const TypeInfo spapr_vio_bridge_info = { 540 .name = "spapr-vio-bridge", 541 .parent = TYPE_SYS_BUS_DEVICE, 542 .instance_size = sizeof(SysBusDevice), 543 .class_init = spapr_vio_bridge_class_init, 544 }; 545 546 const VMStateDescription vmstate_spapr_vio = { 547 .name = "spapr_vio", 548 .version_id = 1, 549 .minimum_version_id = 1, 550 .minimum_version_id_old = 1, 551 .fields = (VMStateField []) { 552 /* Sanity check */ 553 VMSTATE_UINT32_EQUAL(reg, VIOsPAPRDevice), 554 VMSTATE_UINT32_EQUAL(irq, VIOsPAPRDevice), 555 556 /* General VIO device state */ 557 VMSTATE_UINTTL(signal_state, VIOsPAPRDevice), 558 VMSTATE_UINT64(crq.qladdr, VIOsPAPRDevice), 559 VMSTATE_UINT32(crq.qsize, VIOsPAPRDevice), 560 VMSTATE_UINT32(crq.qnext, VIOsPAPRDevice), 561 562 VMSTATE_END_OF_LIST() 563 }, 564 }; 565 566 static void vio_spapr_device_class_init(ObjectClass *klass, void *data) 567 { 568 DeviceClass *k = DEVICE_CLASS(klass); 569 k->init = spapr_vio_busdev_init; 570 k->reset = spapr_vio_busdev_reset; 571 k->bus_type = TYPE_SPAPR_VIO_BUS; 572 k->props = spapr_vio_props; 573 } 574 575 static const TypeInfo spapr_vio_type_info = { 576 .name = TYPE_VIO_SPAPR_DEVICE, 577 .parent = TYPE_DEVICE, 578 .instance_size = sizeof(VIOsPAPRDevice), 579 .abstract = true, 580 .class_size = sizeof(VIOsPAPRDeviceClass), 581 .class_init = vio_spapr_device_class_init, 582 }; 583 584 static void spapr_vio_register_types(void) 585 { 586 type_register_static(&spapr_vio_bus_info); 587 type_register_static(&spapr_vio_bridge_info); 588 type_register_static(&spapr_vio_type_info); 589 } 590 591 type_init(spapr_vio_register_types) 592 593 static int compare_reg(const void *p1, const void *p2) 594 { 595 VIOsPAPRDevice const *dev1, *dev2; 596 597 dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1; 598 dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2; 599 600 if (dev1->reg < dev2->reg) { 601 return -1; 602 } 603 if (dev1->reg == dev2->reg) { 604 return 0; 605 } 606 607 /* dev1->reg > dev2->reg */ 608 return 1; 609 } 610 611 int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt) 612 { 613 DeviceState *qdev, **qdevs; 614 BusChild *kid; 615 int i, num, ret = 0; 616 617 /* Count qdevs on the bus list */ 618 num = 0; 619 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 620 num++; 621 } 622 623 /* Copy out into an array of pointers */ 624 qdevs = g_malloc(sizeof(qdev) * num); 625 num = 0; 626 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 627 qdevs[num++] = kid->child; 628 } 629 630 /* Sort the array */ 631 qsort(qdevs, num, sizeof(qdev), compare_reg); 632 633 /* Hack alert. Give the devices to libfdt in reverse order, we happen 634 * to know that will mean they are in forward order in the tree. */ 635 for (i = num - 1; i >= 0; i--) { 636 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]); 637 638 ret = vio_make_devnode(dev, fdt); 639 640 if (ret < 0) { 641 goto out; 642 } 643 } 644 645 ret = 0; 646 out: 647 free(qdevs); 648 649 return ret; 650 } 651 652 int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus) 653 { 654 VIOsPAPRDevice *dev; 655 char *name, *path; 656 int ret, offset; 657 658 dev = spapr_vty_get_default(bus); 659 if (!dev) 660 return 0; 661 662 offset = fdt_path_offset(fdt, "/chosen"); 663 if (offset < 0) { 664 return offset; 665 } 666 667 name = spapr_vio_get_dev_name(DEVICE(dev)); 668 path = g_strdup_printf("/vdevice/%s", name); 669 670 ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path); 671 672 g_free(name); 673 g_free(path); 674 675 return ret; 676 } 677