hw/spapr_vio.c

   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.h"
  23 #include "sysemu.h"
  24 #include "boards.h"
  25 #include "monitor.h"
  26 #include "loader.h"
  27 #include "elf.h"
  28 #include "hw/sysbus.h"
  29 #include "kvm.h"
  30 #include "device_tree.h"
  31 #include "kvm_ppc.h"
  32
  33 #include "hw/spapr.h"
  34 #include "hw/spapr_vio.h"
  35 #include "hw/xics.h"
  36
  37 #ifdef CONFIG_FDT
  38 #include <libfdt.h>
  39 #endif /* CONFIG_FDT */
  40
  41 /* #define DEBUG_SPAPR */
  42 /* #define DEBUG_TCE */
  43
  44 #ifdef DEBUG_SPAPR
  45 #define dprintf(fmt, ...) \
  46     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  47 #else
  48 #define dprintf(fmt, ...) \
  49     do { } while (0)
  50 #endif
  51
  52 static struct BusInfo spapr_vio_bus_info = {
  53     .name       = "spapr-vio",
  54     .size       = sizeof(VIOsPAPRBus),
  55     .props = (Property[]) {
  56         DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, vio_irq_num, 0), \
  57         DEFINE_PROP_END_OF_LIST(),
  58     },
  59 };
  60
  61 VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)
  62 {
  63     DeviceState *qdev;
  64     VIOsPAPRDevice *dev = NULL;
  65
  66     QTAILQ_FOREACH(qdev, &bus->bus.children, sibling) {
  67         dev = (VIOsPAPRDevice *)qdev;
  68         if (dev->reg == reg) {
  69             return dev;
  70         }
  71     }
  72
  73     return NULL;
  74 }
  75
  76 static char *vio_format_dev_name(VIOsPAPRDevice *dev)
  77 {
  78     VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)dev->qdev.info;
  79     char *name;
  80
  81     /* Device tree style name device@reg */
  82     if (asprintf(&name, "%s@%x", info->dt_name, dev->reg) < 0) {
  83         return NULL;
  84     }
  85
  86     return name;
  87 }
  88
  89 #ifdef CONFIG_FDT
  90 static int vio_make_devnode(VIOsPAPRDevice *dev,
  91                             void *fdt)
  92 {
  93     VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)dev->qdev.info;
  94     int vdevice_off, node_off, ret;
  95     char *dt_name;
  96
  97     vdevice_off = fdt_path_offset(fdt, "/vdevice");
  98     if (vdevice_off < 0) {
  99         return vdevice_off;
 100     }
 101
 102     dt_name = vio_format_dev_name(dev);
 103     if (!dt_name) {
 104         return -ENOMEM;
 105     }
 106
 107     node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
 108     free(dt_name);
 109     if (node_off < 0) {
 110         return node_off;
 111     }
 112
 113     ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
 114     if (ret < 0) {
 115         return ret;
 116     }
 117
 118     if (info->dt_type) {
 119         ret = fdt_setprop_string(fdt, node_off, "device_type",
 120                                  info->dt_type);
 121         if (ret < 0) {
 122             return ret;
 123         }
 124     }
 125
 126     if (info->dt_compatible) {
 127         ret = fdt_setprop_string(fdt, node_off, "compatible",
 128                                  info->dt_compatible);
 129         if (ret < 0) {
 130             return ret;
 131         }
 132     }
 133
 134     if (dev->qirq) {
 135         uint32_t ints_prop[] = {cpu_to_be32(dev->vio_irq_num), 0};
 136
 137         ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
 138                           sizeof(ints_prop));
 139         if (ret < 0) {
 140             return ret;
 141         }
 142     }
 143
 144     if (dev->rtce_window_size) {
 145         uint32_t dma_prop[] = {cpu_to_be32(dev->reg),
 146                                0, 0,
 147                                0, cpu_to_be32(dev->rtce_window_size)};
 148
 149         ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 150         if (ret < 0) {
 151             return ret;
 152         }
 153
 154         ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 155         if (ret < 0) {
 156             return ret;
 157         }
 158
 159         ret = fdt_setprop(fdt, node_off, "ibm,my-dma-window", dma_prop,
 160                           sizeof(dma_prop));
 161         if (ret < 0) {
 162             return ret;
 163         }
 164     }
 165
 166     if (info->devnode) {
 167         ret = (info->devnode)(dev, fdt, node_off);
 168         if (ret < 0) {
 169             return ret;
 170         }
 171     }
 172
 173     return node_off;
 174 }
 175 #endif /* CONFIG_FDT */
 176
 177 /*
 178  * RTCE handling
 179  */
 180
 181 static void rtce_init(VIOsPAPRDevice *dev)
 182 {
 183     size_t size = (dev->rtce_window_size >> SPAPR_VIO_TCE_PAGE_SHIFT)
 184         * sizeof(VIOsPAPR_RTCE);
 185
 186     if (size) {
 187         dev->rtce_table = kvmppc_create_spapr_tce(dev->reg,
 188                                                   dev->rtce_window_size,
 189                                                   &dev->kvmtce_fd);
 190
 191         if (!dev->rtce_table) {
 192             dev->rtce_table = g_malloc0(size);
 193         }
 194     }
 195 }
 196
 197 static target_ulong h_put_tce(CPUState *env, sPAPREnvironment *spapr,
 198                               target_ulong opcode, target_ulong *args)
 199 {
 200     target_ulong liobn = args[0];
 201     target_ulong ioba = args[1];
 202     target_ulong tce = args[2];
 203     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, liobn);
 204     VIOsPAPR_RTCE *rtce;
 205
 206     if (!dev) {
 207         hcall_dprintf("spapr_vio_put_tce on non-existent LIOBN "
 208                       TARGET_FMT_lx "\n", liobn);
 209         return H_PARAMETER;
 210     }
 211
 212     ioba &= ~(SPAPR_VIO_TCE_PAGE_SIZE - 1);
 213
 214 #ifdef DEBUG_TCE
 215     fprintf(stderr, "spapr_vio_put_tce on %s  ioba 0x" TARGET_FMT_lx
 216             "  TCE 0x" TARGET_FMT_lx "\n", dev->qdev.id, ioba, tce);
 217 #endif
 218
 219     if (ioba >= dev->rtce_window_size) {
 220         hcall_dprintf("spapr_vio_put_tce on out-of-boards IOBA 0x"
 221                       TARGET_FMT_lx "\n", ioba);
 222         return H_PARAMETER;
 223     }
 224
 225     rtce = dev->rtce_table + (ioba >> SPAPR_VIO_TCE_PAGE_SHIFT);
 226     rtce->tce = tce;
 227
 228     return H_SUCCESS;
 229 }
 230
 231 int spapr_vio_check_tces(VIOsPAPRDevice *dev, target_ulong ioba,
 232                          target_ulong len, enum VIOsPAPR_TCEAccess access)
 233 {
 234     int start, end, i;
 235
 236     start = ioba >> SPAPR_VIO_TCE_PAGE_SHIFT;
 237     end = (ioba + len - 1) >> SPAPR_VIO_TCE_PAGE_SHIFT;
 238
 239     for (i = start; i <= end; i++) {
 240         if ((dev->rtce_table[i].tce & access) != access) {
 241 #ifdef DEBUG_TCE
 242             fprintf(stderr, "FAIL on %d\n", i);
 243 #endif
 244             return -1;
 245         }
 246     }
 247
 248     return 0;
 249 }
 250
 251 int spapr_tce_dma_write(VIOsPAPRDevice *dev, uint64_t taddr, const void *buf,
 252                         uint32_t size)
 253 {
 254 #ifdef DEBUG_TCE
 255     fprintf(stderr, "spapr_tce_dma_write taddr=0x%llx size=0x%x\n",
 256             (unsigned long long)taddr, size);
 257 #endif
 258
 259     /* Check for bypass */
 260     if (dev->flags & VIO_PAPR_FLAG_DMA_BYPASS) {
 261         cpu_physical_memory_write(taddr, buf, size);
 262         return 0;
 263     }
 264
 265     while (size) {
 266         uint64_t tce;
 267         uint32_t lsize;
 268         uint64_t txaddr;
 269
 270         /* Check if we are in bound */
 271         if (taddr >= dev->rtce_window_size) {
 272 #ifdef DEBUG_TCE
 273             fprintf(stderr, "spapr_tce_dma_write out of bounds\n");
 274 #endif
 275             return H_DEST_PARM;
 276         }
 277         tce = dev->rtce_table[taddr >> SPAPR_VIO_TCE_PAGE_SHIFT].tce;
 278
 279         /* How much til end of page ? */
 280         lsize = MIN(size, ((~taddr) & SPAPR_VIO_TCE_PAGE_MASK) + 1);
 281
 282         /* Check TCE */
 283         if (!(tce & 2)) {
 284             return H_DEST_PARM;
 285         }
 286
 287         /* Translate */
 288         txaddr = (tce & ~SPAPR_VIO_TCE_PAGE_MASK) |
 289             (taddr & SPAPR_VIO_TCE_PAGE_MASK);
 290
 291 #ifdef DEBUG_TCE
 292         fprintf(stderr, " -> write to txaddr=0x%llx, size=0x%x\n",
 293                 (unsigned long long)txaddr, lsize);
 294 #endif
 295
 296         /* Do it */
 297         cpu_physical_memory_write(txaddr, buf, lsize);
 298         buf += lsize;
 299         taddr += lsize;
 300         size -= lsize;
 301     }
 302     return 0;
 303 }
 304
 305 int spapr_tce_dma_zero(VIOsPAPRDevice *dev, uint64_t taddr, uint32_t size)
 306 {
 307     /* FIXME: allocating a temp buffer is nasty, but just stepping
 308      * through writing zeroes is awkward.  This will do for now. */
 309     uint8_t zeroes[size];
 310
 311 #ifdef DEBUG_TCE
 312     fprintf(stderr, "spapr_tce_dma_zero taddr=0x%llx size=0x%x\n",
 313             (unsigned long long)taddr, size);
 314 #endif
 315
 316     memset(zeroes, 0, size);
 317     return spapr_tce_dma_write(dev, taddr, zeroes, size);
 318 }
 319
 320 void stb_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint8_t val)
 321 {
 322     spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
 323 }
 324
 325 void sth_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint16_t val)
 326 {
 327     val = tswap16(val);
 328     spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
 329 }
 330
 331
 332 void stw_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint32_t val)
 333 {
 334     val = tswap32(val);
 335     spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
 336 }
 337
 338 void stq_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint64_t val)
 339 {
 340     val = tswap64(val);
 341     spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
 342 }
 343
 344 int spapr_tce_dma_read(VIOsPAPRDevice *dev, uint64_t taddr, void *buf,
 345                        uint32_t size)
 346 {
 347 #ifdef DEBUG_TCE
 348     fprintf(stderr, "spapr_tce_dma_write taddr=0x%llx size=0x%x\n",
 349             (unsigned long long)taddr, size);
 350 #endif
 351
 352     /* Check for bypass */
 353     if (dev->flags & VIO_PAPR_FLAG_DMA_BYPASS) {
 354         cpu_physical_memory_read(taddr, buf, size);
 355         return 0;
 356     }
 357
 358     while (size) {
 359         uint64_t tce;
 360         uint32_t lsize;
 361         uint64_t txaddr;
 362
 363         /* Check if we are in bound */
 364         if (taddr >= dev->rtce_window_size) {
 365 #ifdef DEBUG_TCE
 366             fprintf(stderr, "spapr_tce_dma_read out of bounds\n");
 367 #endif
 368             return H_DEST_PARM;
 369         }
 370         tce = dev->rtce_table[taddr >> SPAPR_VIO_TCE_PAGE_SHIFT].tce;
 371
 372         /* How much til end of page ? */
 373         lsize = MIN(size, ((~taddr) & SPAPR_VIO_TCE_PAGE_MASK) + 1);
 374
 375         /* Check TCE */
 376         if (!(tce & 1)) {
 377             return H_DEST_PARM;
 378         }
 379
 380         /* Translate */
 381         txaddr = (tce & ~SPAPR_VIO_TCE_PAGE_MASK) |
 382             (taddr & SPAPR_VIO_TCE_PAGE_MASK);
 383
 384 #ifdef DEBUG_TCE
 385         fprintf(stderr, " -> write to txaddr=0x%llx, size=0x%x\n",
 386                 (unsigned long long)txaddr, lsize);
 387 #endif
 388         /* Do it */
 389         cpu_physical_memory_read(txaddr, buf, lsize);
 390         buf += lsize;
 391         taddr += lsize;
 392         size -= lsize;
 393     }
 394     return H_SUCCESS;
 395 }
 396
 397 uint64_t ldq_tce(VIOsPAPRDevice *dev, uint64_t taddr)
 398 {
 399     uint64_t val;
 400
 401     spapr_tce_dma_read(dev, taddr, &val, sizeof(val));
 402     return tswap64(val);
 403 }
 404
 405 /*
 406  * CRQ handling
 407  */
 408 static target_ulong h_reg_crq(CPUState *env, sPAPREnvironment *spapr,
 409                               target_ulong opcode, target_ulong *args)
 410 {
 411     target_ulong reg = args[0];
 412     target_ulong queue_addr = args[1];
 413     target_ulong queue_len = args[2];
 414     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 415
 416     if (!dev) {
 417         hcall_dprintf("h_reg_crq on non-existent unit 0x"
 418                       TARGET_FMT_lx "\n", reg);
 419         return H_PARAMETER;
 420     }
 421
 422     /* We can't grok a queue size bigger than 256M for now */
 423     if (queue_len < 0x1000 || queue_len > 0x10000000) {
 424         hcall_dprintf("h_reg_crq, queue size too small or too big (0x%llx)\n",
 425                       (unsigned long long)queue_len);
 426         return H_PARAMETER;
 427     }
 428
 429     /* Check queue alignment */
 430     if (queue_addr & 0xfff) {
 431         hcall_dprintf("h_reg_crq, queue not aligned (0x%llx)\n",
 432                       (unsigned long long)queue_addr);
 433         return H_PARAMETER;
 434     }
 435
 436     /* Check if device supports CRQs */
 437     if (!dev->crq.SendFunc) {
 438         return H_NOT_FOUND;
 439     }
 440
 441
 442     /* Already a queue ? */
 443     if (dev->crq.qsize) {
 444         return H_RESOURCE;
 445     }
 446     dev->crq.qladdr = queue_addr;
 447     dev->crq.qsize = queue_len;
 448     dev->crq.qnext = 0;
 449
 450     dprintf("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x"
 451             TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n",
 452             reg, queue_addr, queue_len);
 453     return H_SUCCESS;
 454 }
 455
 456 static target_ulong h_free_crq(CPUState *env, sPAPREnvironment *spapr,
 457                                target_ulong opcode, target_ulong *args)
 458 {
 459     target_ulong reg = args[0];
 460     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 461
 462     if (!dev) {
 463         hcall_dprintf("h_free_crq on non-existent unit 0x"
 464                       TARGET_FMT_lx "\n", reg);
 465         return H_PARAMETER;
 466     }
 467
 468     dev->crq.qladdr = 0;
 469     dev->crq.qsize = 0;
 470     dev->crq.qnext = 0;
 471
 472     dprintf("CRQ for dev 0x" TARGET_FMT_lx " freed\n", reg);
 473
 474     return H_SUCCESS;
 475 }
 476
 477 static target_ulong h_send_crq(CPUState *env, sPAPREnvironment *spapr,
 478                                target_ulong opcode, target_ulong *args)
 479 {
 480     target_ulong reg = args[0];
 481     target_ulong msg_hi = args[1];
 482     target_ulong msg_lo = args[2];
 483     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 484     uint64_t crq_mangle[2];
 485
 486     if (!dev) {
 487         hcall_dprintf("h_send_crq on non-existent unit 0x"
 488                       TARGET_FMT_lx "\n", reg);
 489         return H_PARAMETER;
 490     }
 491     crq_mangle[0] = cpu_to_be64(msg_hi);
 492     crq_mangle[1] = cpu_to_be64(msg_lo);
 493
 494     if (dev->crq.SendFunc) {
 495         return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);
 496     }
 497
 498     return H_HARDWARE;
 499 }
 500
 501 static target_ulong h_enable_crq(CPUState *env, sPAPREnvironment *spapr,
 502                                  target_ulong opcode, target_ulong *args)
 503 {
 504     target_ulong reg = args[0];
 505     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 506
 507     if (!dev) {
 508         hcall_dprintf("h_enable_crq on non-existent unit 0x"
 509                       TARGET_FMT_lx "\n", reg);
 510         return H_PARAMETER;
 511     }
 512
 513     return 0;
 514 }
 515
 516 /* Returns negative error, 0 success, or positive: queue full */
 517 int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq)
 518 {
 519     int rc;
 520     uint8_t byte;
 521
 522     if (!dev->crq.qsize) {
 523         fprintf(stderr, "spapr_vio_send_creq on uninitialized queue\n");
 524         return -1;
 525     }
 526
 527     /* Maybe do a fast path for KVM just writing to the pages */
 528     rc = spapr_tce_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
 529     if (rc) {
 530         return rc;
 531     }
 532     if (byte != 0) {
 533         return 1;
 534     }
 535
 536     rc = spapr_tce_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
 537                              &crq[8], 8);
 538     if (rc) {
 539         return rc;
 540     }
 541
 542     kvmppc_eieio();
 543
 544     rc = spapr_tce_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);
 545     if (rc) {
 546         return rc;
 547     }
 548
 549     dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;
 550
 551     if (dev->signal_state & 1) {
 552         qemu_irq_pulse(dev->qirq);
 553     }
 554
 555     return 0;
 556 }
 557
 558 /* "quiesce" handling */
 559
 560 static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev)
 561 {
 562     dev->flags &= ~VIO_PAPR_FLAG_DMA_BYPASS;
 563
 564     if (dev->rtce_table) {
 565         size_t size = (dev->rtce_window_size >> SPAPR_VIO_TCE_PAGE_SHIFT)
 566             * sizeof(VIOsPAPR_RTCE);
 567         memset(dev->rtce_table, 0, size);
 568     }
 569
 570     dev->crq.qladdr = 0;
 571     dev->crq.qsize = 0;
 572     dev->crq.qnext = 0;
 573 }
 574
 575 static void rtas_set_tce_bypass(sPAPREnvironment *spapr, uint32_t token,
 576                                 uint32_t nargs, target_ulong args,
 577                                 uint32_t nret, target_ulong rets)
 578 {
 579     VIOsPAPRBus *bus = spapr->vio_bus;
 580     VIOsPAPRDevice *dev;
 581     uint32_t unit, enable;
 582
 583     if (nargs != 2) {
 584         rtas_st(rets, 0, -3);
 585         return;
 586     }
 587     unit = rtas_ld(args, 0);
 588     enable = rtas_ld(args, 1);
 589     dev = spapr_vio_find_by_reg(bus, unit);
 590     if (!dev) {
 591         rtas_st(rets, 0, -3);
 592         return;
 593     }
 594     if (enable) {
 595         dev->flags |= VIO_PAPR_FLAG_DMA_BYPASS;
 596     } else {
 597         dev->flags &= ~VIO_PAPR_FLAG_DMA_BYPASS;
 598     }
 599
 600     rtas_st(rets, 0, 0);
 601 }
 602
 603 static void rtas_quiesce(sPAPREnvironment *spapr, uint32_t token,
 604                          uint32_t nargs, target_ulong args,
 605                          uint32_t nret, target_ulong rets)
 606 {
 607     VIOsPAPRBus *bus = spapr->vio_bus;
 608     DeviceState *qdev;
 609     VIOsPAPRDevice *dev = NULL;
 610
 611     if (nargs != 0) {
 612         rtas_st(rets, 0, -3);
 613         return;
 614     }
 615
 616     QTAILQ_FOREACH(qdev, &bus->bus.children, sibling) {
 617         dev = (VIOsPAPRDevice *)qdev;
 618         spapr_vio_quiesce_one(dev);
 619     }
 620
 621     rtas_st(rets, 0, 0);
 622 }
 623
 624 static int spapr_vio_busdev_init(DeviceState *qdev, DeviceInfo *qinfo)
 625 {
 626     VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)qinfo;
 627     VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
 628     char *id;
 629
 630     /* Don't overwrite ids assigned on the command line */
 631     if (!dev->qdev.id) {
 632         id = vio_format_dev_name(dev);
 633         if (!id) {
 634             return -1;
 635         }
 636         dev->qdev.id = id;
 637     }
 638
 639     dev->qirq = spapr_allocate_irq(dev->vio_irq_num, &dev->vio_irq_num);
 640     if (!dev->qirq) {
 641         return -1;
 642     }
 643
 644     rtce_init(dev);
 645
 646     return info->init(dev);
 647 }
 648
 649 void spapr_vio_bus_register_withprop(VIOsPAPRDeviceInfo *info)
 650 {
 651     info->qdev.init = spapr_vio_busdev_init;
 652     info->qdev.bus_info = &spapr_vio_bus_info;
 653
 654     assert(info->qdev.size >= sizeof(VIOsPAPRDevice));
 655     qdev_register(&info->qdev);
 656 }
 657
 658 static target_ulong h_vio_signal(CPUState *env, sPAPREnvironment *spapr,
 659                                  target_ulong opcode,
 660                                  target_ulong *args)
 661 {
 662     target_ulong reg = args[0];
 663     target_ulong mode = args[1];
 664     VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 665     VIOsPAPRDeviceInfo *info;
 666
 667     if (!dev) {
 668         return H_PARAMETER;
 669     }
 670
 671     info = (VIOsPAPRDeviceInfo *)dev->qdev.info;
 672
 673     if (mode & ~info->signal_mask) {
 674         return H_PARAMETER;
 675     }
 676
 677     dev->signal_state = mode;
 678
 679     return H_SUCCESS;
 680 }
 681
 682 VIOsPAPRBus *spapr_vio_bus_init(void)
 683 {
 684     VIOsPAPRBus *bus;
 685     BusState *qbus;
 686     DeviceState *dev;
 687     DeviceInfo *qinfo;
 688
 689     /* Create bridge device */
 690     dev = qdev_create(NULL, "spapr-vio-bridge");
 691     qdev_init_nofail(dev);
 692
 693     /* Create bus on bridge device */
 694
 695     qbus = qbus_create(&spapr_vio_bus_info, dev, "spapr-vio");
 696     bus = DO_UPCAST(VIOsPAPRBus, bus, qbus);
 697
 698     /* hcall-vio */
 699     spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);
 700
 701     /* hcall-tce */
 702     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 703
 704     /* hcall-crq */
 705     spapr_register_hypercall(H_REG_CRQ, h_reg_crq);
 706     spapr_register_hypercall(H_FREE_CRQ, h_free_crq);
 707     spapr_register_hypercall(H_SEND_CRQ, h_send_crq);
 708     spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq);
 709
 710     /* RTAS calls */
 711     spapr_rtas_register("ibm,set-tce-bypass", rtas_set_tce_bypass);
 712     spapr_rtas_register("quiesce", rtas_quiesce);
 713
 714     for (qinfo = device_info_list; qinfo; qinfo = qinfo->next) {
 715         VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)qinfo;
 716
 717         if (qinfo->bus_info != &spapr_vio_bus_info) {
 718             continue;
 719         }
 720
 721         if (info->hcalls) {
 722             info->hcalls(bus);
 723         }
 724     }
 725
 726     return bus;
 727 }
 728
 729 /* Represents sPAPR hcall VIO devices */
 730
 731 static int spapr_vio_bridge_init(SysBusDevice *dev)
 732 {
 733     /* nothing */
 734     return 0;
 735 }
 736
 737 static SysBusDeviceInfo spapr_vio_bridge_info = {
 738     .init = spapr_vio_bridge_init,
 739     .qdev.name  = "spapr-vio-bridge",
 740     .qdev.size  = sizeof(SysBusDevice),
 741     .qdev.no_user = 1,
 742 };
 743
 744 static void spapr_vio_register_devices(void)
 745 {
 746     sysbus_register_withprop(&spapr_vio_bridge_info);
 747 }
 748
 749 device_init(spapr_vio_register_devices)
 750
 751 #ifdef CONFIG_FDT
 752 int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)
 753 {
 754     DeviceState *qdev;
 755     int ret = 0;
 756
 757     QTAILQ_FOREACH(qdev, &bus->bus.children, sibling) {
 758         VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
 759
 760         ret = vio_make_devnode(dev, fdt);
 761
 762         if (ret < 0) {
 763             return ret;
 764         }
 765     }
 766
 767     return 0;
 768 }
 769 #endif /* CONFIG_FDT */