hw/spapr_pci.c

   1 /*
   2  * QEMU sPAPR PCI host originated from Uninorth PCI host
   3  *
   4  * Copyright (c) 2011 Alexey Kardashevskiy, IBM Corporation.
   5  * Copyright (C) 2011 David Gibson, IBM Corporation.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "hw/hw.h"
  26 #include "hw/pci/pci.h"
  27 #include "hw/pci/msi.h"
  28 #include "hw/pci/msix.h"
  29 #include "hw/pci/pci_host.h"
  30 #include "hw/spapr.h"
  31 #include "hw/spapr_pci.h"
  32 #include "exec/address-spaces.h"
  33 #include <libfdt.h>
  34 #include "trace.h"
  35
  36 #include "hw/pci/pci_bus.h"
  37
  38 /* Copied from the kernel arch/powerpc/platforms/pseries/msi.c */
  39 #define RTAS_QUERY_FN           0
  40 #define RTAS_CHANGE_FN          1
  41 #define RTAS_RESET_FN           2
  42 #define RTAS_CHANGE_MSI_FN      3
  43 #define RTAS_CHANGE_MSIX_FN     4
  44
  45 /* Interrupt types to return on RTAS_CHANGE_* */
  46 #define RTAS_TYPE_MSI           1
  47 #define RTAS_TYPE_MSIX          2
  48
  49 static sPAPRPHBState *find_phb(sPAPREnvironment *spapr, uint64_t buid)
  50 {
  51     sPAPRPHBState *sphb;
  52
  53     QLIST_FOREACH(sphb, &spapr->phbs, list) {
  54         if (sphb->buid != buid) {
  55             continue;
  56         }
  57         return sphb;
  58     }
  59
  60     return NULL;
  61 }
  62
  63 static PCIDevice *find_dev(sPAPREnvironment *spapr, uint64_t buid,
  64                            uint32_t config_addr)
  65 {
  66     sPAPRPHBState *sphb = find_phb(spapr, buid);
  67     PCIHostState *phb = PCI_HOST_BRIDGE(sphb);
  68     BusState *bus = BUS(phb->bus);
  69     BusChild *kid;
  70     int devfn = (config_addr >> 8) & 0xFF;
  71
  72     if (!phb) {
  73         return NULL;
  74     }
  75
  76     QTAILQ_FOREACH(kid, &bus->children, sibling) {
  77         PCIDevice *dev = (PCIDevice *)kid->child;
  78         if (dev->devfn == devfn) {
  79             return dev;
  80         }
  81     }
  82
  83     return NULL;
  84 }
  85
  86 static uint32_t rtas_pci_cfgaddr(uint32_t arg)
  87 {
  88     /* This handles the encoding of extended config space addresses */
  89     return ((arg >> 20) & 0xf00) | (arg & 0xff);
  90 }
  91
  92 static void finish_read_pci_config(sPAPREnvironment *spapr, uint64_t buid,
  93                                    uint32_t addr, uint32_t size,
  94                                    target_ulong rets)
  95 {
  96     PCIDevice *pci_dev;
  97     uint32_t val;
  98
  99     if ((size != 1) && (size != 2) && (size != 4)) {
 100         /* access must be 1, 2 or 4 bytes */
 101         rtas_st(rets, 0, -1);
 102         return;
 103     }
 104
 105     pci_dev = find_dev(spapr, buid, addr);
 106     addr = rtas_pci_cfgaddr(addr);
 107
 108     if (!pci_dev || (addr % size) || (addr >= pci_config_size(pci_dev))) {
 109         /* Access must be to a valid device, within bounds and
 110          * naturally aligned */
 111         rtas_st(rets, 0, -1);
 112         return;
 113     }
 114
 115     val = pci_host_config_read_common(pci_dev, addr,
 116                                       pci_config_size(pci_dev), size);
 117
 118     rtas_st(rets, 0, 0);
 119     rtas_st(rets, 1, val);
 120 }
 121
 122 static void rtas_ibm_read_pci_config(sPAPREnvironment *spapr,
 123                                      uint32_t token, uint32_t nargs,
 124                                      target_ulong args,
 125                                      uint32_t nret, target_ulong rets)
 126 {
 127     uint64_t buid;
 128     uint32_t size, addr;
 129
 130     if ((nargs != 4) || (nret != 2)) {
 131         rtas_st(rets, 0, -1);
 132         return;
 133     }
 134
 135     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 136     size = rtas_ld(args, 3);
 137     addr = rtas_ld(args, 0);
 138
 139     finish_read_pci_config(spapr, buid, addr, size, rets);
 140 }
 141
 142 static void rtas_read_pci_config(sPAPREnvironment *spapr,
 143                                  uint32_t token, uint32_t nargs,
 144                                  target_ulong args,
 145                                  uint32_t nret, target_ulong rets)
 146 {
 147     uint32_t size, addr;
 148
 149     if ((nargs != 2) || (nret != 2)) {
 150         rtas_st(rets, 0, -1);
 151         return;
 152     }
 153
 154     size = rtas_ld(args, 1);
 155     addr = rtas_ld(args, 0);
 156
 157     finish_read_pci_config(spapr, 0, addr, size, rets);
 158 }
 159
 160 static void finish_write_pci_config(sPAPREnvironment *spapr, uint64_t buid,
 161                                     uint32_t addr, uint32_t size,
 162                                     uint32_t val, target_ulong rets)
 163 {
 164     PCIDevice *pci_dev;
 165
 166     if ((size != 1) && (size != 2) && (size != 4)) {
 167         /* access must be 1, 2 or 4 bytes */
 168         rtas_st(rets, 0, -1);
 169         return;
 170     }
 171
 172     pci_dev = find_dev(spapr, buid, addr);
 173     addr = rtas_pci_cfgaddr(addr);
 174
 175     if (!pci_dev || (addr % size) || (addr >= pci_config_size(pci_dev))) {
 176         /* Access must be to a valid device, within bounds and
 177          * naturally aligned */
 178         rtas_st(rets, 0, -1);
 179         return;
 180     }
 181
 182     pci_host_config_write_common(pci_dev, addr, pci_config_size(pci_dev),
 183                                  val, size);
 184
 185     rtas_st(rets, 0, 0);
 186 }
 187
 188 static void rtas_ibm_write_pci_config(sPAPREnvironment *spapr,
 189                                       uint32_t token, uint32_t nargs,
 190                                       target_ulong args,
 191                                       uint32_t nret, target_ulong rets)
 192 {
 193     uint64_t buid;
 194     uint32_t val, size, addr;
 195
 196     if ((nargs != 5) || (nret != 1)) {
 197         rtas_st(rets, 0, -1);
 198         return;
 199     }
 200
 201     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 202     val = rtas_ld(args, 4);
 203     size = rtas_ld(args, 3);
 204     addr = rtas_ld(args, 0);
 205
 206     finish_write_pci_config(spapr, buid, addr, size, val, rets);
 207 }
 208
 209 static void rtas_write_pci_config(sPAPREnvironment *spapr,
 210                                   uint32_t token, uint32_t nargs,
 211                                   target_ulong args,
 212                                   uint32_t nret, target_ulong rets)
 213 {
 214     uint32_t val, size, addr;
 215
 216     if ((nargs != 3) || (nret != 1)) {
 217         rtas_st(rets, 0, -1);
 218         return;
 219     }
 220
 221
 222     val = rtas_ld(args, 2);
 223     size = rtas_ld(args, 1);
 224     addr = rtas_ld(args, 0);
 225
 226     finish_write_pci_config(spapr, 0, addr, size, val, rets);
 227 }
 228
 229 /*
 230  * Find an entry with config_addr or returns the empty one if not found AND
 231  * alloc_new is set.
 232  * At the moment the msi_table entries are never released so there is
 233  * no point to look till the end of the list if we need to find the free entry.
 234  */
 235 static int spapr_msicfg_find(sPAPRPHBState *phb, uint32_t config_addr,
 236                              bool alloc_new)
 237 {
 238     int i;
 239
 240     for (i = 0; i < SPAPR_MSIX_MAX_DEVS; ++i) {
 241         if (!phb->msi_table[i].nvec) {
 242             break;
 243         }
 244         if (phb->msi_table[i].config_addr == config_addr) {
 245             return i;
 246         }
 247     }
 248     if ((i < SPAPR_MSIX_MAX_DEVS) && alloc_new) {
 249         trace_spapr_pci_msi("Allocating new MSI config", i, config_addr);
 250         return i;
 251     }
 252
 253     return -1;
 254 }
 255
 256 /*
 257  * Set MSI/MSIX message data.
 258  * This is required for msi_notify()/msix_notify() which
 259  * will write at the addresses via spapr_msi_write().
 260  */
 261 static void spapr_msi_setmsg(PCIDevice *pdev, hwaddr addr,
 262                              bool msix, unsigned req_num)
 263 {
 264     unsigned i;
 265     MSIMessage msg = { .address = addr, .data = 0 };
 266
 267     if (!msix) {
 268         msi_set_message(pdev, msg);
 269         trace_spapr_pci_msi_setup(pdev->name, 0, msg.address);
 270         return;
 271     }
 272
 273     for (i = 0; i < req_num; ++i) {
 274         msg.address = addr | (i << 2);
 275         msix_set_message(pdev, i, msg);
 276         trace_spapr_pci_msi_setup(pdev->name, i, msg.address);
 277     }
 278 }
 279
 280 static void rtas_ibm_change_msi(sPAPREnvironment *spapr,
 281                                 uint32_t token, uint32_t nargs,
 282                                 target_ulong args, uint32_t nret,
 283                                 target_ulong rets)
 284 {
 285     uint32_t config_addr = rtas_ld(args, 0);
 286     uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 287     unsigned int func = rtas_ld(args, 3);
 288     unsigned int req_num = rtas_ld(args, 4); /* 0 == remove all */
 289     unsigned int seq_num = rtas_ld(args, 5);
 290     unsigned int ret_intr_type;
 291     int ndev, irq;
 292     sPAPRPHBState *phb = NULL;
 293     PCIDevice *pdev = NULL;
 294
 295     switch (func) {
 296     case RTAS_CHANGE_MSI_FN:
 297     case RTAS_CHANGE_FN:
 298         ret_intr_type = RTAS_TYPE_MSI;
 299         break;
 300     case RTAS_CHANGE_MSIX_FN:
 301         ret_intr_type = RTAS_TYPE_MSIX;
 302         break;
 303     default:
 304         fprintf(stderr, "rtas_ibm_change_msi(%u) is not implemented\n", func);
 305         rtas_st(rets, 0, -3); /* Parameter error */
 306         return;
 307     }
 308
 309     /* Fins sPAPRPHBState */
 310     phb = find_phb(spapr, buid);
 311     if (phb) {
 312         pdev = find_dev(spapr, buid, config_addr);
 313     }
 314     if (!phb || !pdev) {
 315         rtas_st(rets, 0, -3); /* Parameter error */
 316         return;
 317     }
 318
 319     /* Releasing MSIs */
 320     if (!req_num) {
 321         ndev = spapr_msicfg_find(phb, config_addr, false);
 322         if (ndev < 0) {
 323             trace_spapr_pci_msi("MSI has not been enabled", -1, config_addr);
 324             rtas_st(rets, 0, -1); /* Hardware error */
 325             return;
 326         }
 327         trace_spapr_pci_msi("Released MSIs", ndev, config_addr);
 328         rtas_st(rets, 0, 0);
 329         rtas_st(rets, 1, 0);
 330         return;
 331     }
 332
 333     /* Enabling MSI */
 334
 335     /* Find a device number in the map to add or reuse the existing one */
 336     ndev = spapr_msicfg_find(phb, config_addr, true);
 337     if (ndev >= SPAPR_MSIX_MAX_DEVS || ndev < 0) {
 338         fprintf(stderr, "No free entry for a new MSI device\n");
 339         rtas_st(rets, 0, -1); /* Hardware error */
 340         return;
 341     }
 342     trace_spapr_pci_msi("Configuring MSI", ndev, config_addr);
 343
 344     /* Check if there is an old config and MSI number has not changed */
 345     if (phb->msi_table[ndev].nvec && (req_num != phb->msi_table[ndev].nvec)) {
 346         /* Unexpected behaviour */
 347         fprintf(stderr, "Cannot reuse MSI config for device#%d", ndev);
 348         rtas_st(rets, 0, -1); /* Hardware error */
 349         return;
 350     }
 351
 352     /* There is no cached config, allocate MSIs */
 353     if (!phb->msi_table[ndev].nvec) {
 354         irq = spapr_allocate_irq_block(req_num, false);
 355         if (irq < 0) {
 356             fprintf(stderr, "Cannot allocate MSIs for device#%d", ndev);
 357             rtas_st(rets, 0, -1); /* Hardware error */
 358             return;
 359         }
 360         phb->msi_table[ndev].irq = irq;
 361         phb->msi_table[ndev].nvec = req_num;
 362         phb->msi_table[ndev].config_addr = config_addr;
 363     }
 364
 365     /* Setup MSI/MSIX vectors in the device (via cfgspace or MSIX BAR) */
 366     spapr_msi_setmsg(pdev, phb->msi_win_addr | (ndev << 16),
 367                      ret_intr_type == RTAS_TYPE_MSIX, req_num);
 368
 369     rtas_st(rets, 0, 0);
 370     rtas_st(rets, 1, req_num);
 371     rtas_st(rets, 2, ++seq_num);
 372     rtas_st(rets, 3, ret_intr_type);
 373
 374     trace_spapr_pci_rtas_ibm_change_msi(func, req_num);
 375 }
 376
 377 static void rtas_ibm_query_interrupt_source_number(sPAPREnvironment *spapr,
 378                                                    uint32_t token,
 379                                                    uint32_t nargs,
 380                                                    target_ulong args,
 381                                                    uint32_t nret,
 382                                                    target_ulong rets)
 383 {
 384     uint32_t config_addr = rtas_ld(args, 0);
 385     uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 386     unsigned int intr_src_num = -1, ioa_intr_num = rtas_ld(args, 3);
 387     int ndev;
 388     sPAPRPHBState *phb = NULL;
 389
 390     /* Fins sPAPRPHBState */
 391     phb = find_phb(spapr, buid);
 392     if (!phb) {
 393         rtas_st(rets, 0, -3); /* Parameter error */
 394         return;
 395     }
 396
 397     /* Find device descriptor and start IRQ */
 398     ndev = spapr_msicfg_find(phb, config_addr, false);
 399     if (ndev < 0) {
 400         trace_spapr_pci_msi("MSI has not been enabled", -1, config_addr);
 401         rtas_st(rets, 0, -1); /* Hardware error */
 402         return;
 403     }
 404
 405     intr_src_num = phb->msi_table[ndev].irq + ioa_intr_num;
 406     trace_spapr_pci_rtas_ibm_query_interrupt_source_number(ioa_intr_num,
 407                                                            intr_src_num);
 408
 409     rtas_st(rets, 0, 0);
 410     rtas_st(rets, 1, intr_src_num);
 411     rtas_st(rets, 2, 1);/* 0 == level; 1 == edge */
 412 }
 413
 414 static int pci_spapr_swizzle(int slot, int pin)
 415 {
 416     return (slot + pin) % PCI_NUM_PINS;
 417 }
 418
 419 static int pci_spapr_map_irq(PCIDevice *pci_dev, int irq_num)
 420 {
 421     /*
 422      * Here we need to convert pci_dev + irq_num to some unique value
 423      * which is less than number of IRQs on the specific bus (4).  We
 424      * use standard PCI swizzling, that is (slot number + pin number)
 425      * % 4.
 426      */
 427     return pci_spapr_swizzle(PCI_SLOT(pci_dev->devfn), irq_num);
 428 }
 429
 430 static void pci_spapr_set_irq(void *opaque, int irq_num, int level)
 431 {
 432     /*
 433      * Here we use the number returned by pci_spapr_map_irq to find a
 434      * corresponding qemu_irq.
 435      */
 436     sPAPRPHBState *phb = opaque;
 437
 438     trace_spapr_pci_lsi_set(phb->dtbusname, irq_num, phb->lsi_table[irq_num].irq);
 439     qemu_set_irq(spapr_phb_lsi_qirq(phb, irq_num), level);
 440 }
 441
 442 static uint64_t spapr_io_read(void *opaque, hwaddr addr,
 443                               unsigned size)
 444 {
 445     switch (size) {
 446     case 1:
 447         return cpu_inb(addr);
 448     case 2:
 449         return cpu_inw(addr);
 450     case 4:
 451         return cpu_inl(addr);
 452     }
 453     assert(0);
 454 }
 455
 456 static void spapr_io_write(void *opaque, hwaddr addr,
 457                            uint64_t data, unsigned size)
 458 {
 459     switch (size) {
 460     case 1:
 461         cpu_outb(addr, data);
 462         return;
 463     case 2:
 464         cpu_outw(addr, data);
 465         return;
 466     case 4:
 467         cpu_outl(addr, data);
 468         return;
 469     }
 470     assert(0);
 471 }
 472
 473 static const MemoryRegionOps spapr_io_ops = {
 474     .endianness = DEVICE_LITTLE_ENDIAN,
 475     .read = spapr_io_read,
 476     .write = spapr_io_write
 477 };
 478
 479 /*
 480  * MSI/MSIX memory region implementation.
 481  * The handler handles both MSI and MSIX.
 482  * For MSI-X, the vector number is encoded as a part of the address,
 483  * data is set to 0.
 484  * For MSI, the vector number is encoded in least bits in data.
 485  */
 486 static void spapr_msi_write(void *opaque, hwaddr addr,
 487                             uint64_t data, unsigned size)
 488 {
 489     sPAPRPHBState *phb = opaque;
 490     int ndev = addr >> 16;
 491     int vec = ((addr & 0xFFFF) >> 2) | data;
 492     uint32_t irq = phb->msi_table[ndev].irq + vec;
 493
 494     trace_spapr_pci_msi_write(addr, data, irq);
 495
 496     qemu_irq_pulse(xics_get_qirq(spapr->icp, irq));
 497 }
 498
 499 static const MemoryRegionOps spapr_msi_ops = {
 500     /* There is no .read as the read result is undefined by PCI spec */
 501     .read = NULL,
 502     .write = spapr_msi_write,
 503     .endianness = DEVICE_LITTLE_ENDIAN
 504 };
 505
 506 /*
 507  * PHB PCI device
 508  */
 509 static DMAContext *spapr_pci_dma_context_fn(PCIBus *bus, void *opaque,
 510                                             int devfn)
 511 {
 512     sPAPRPHBState *phb = opaque;
 513
 514     return phb->dma;
 515 }
 516
 517 static int spapr_phb_init(SysBusDevice *s)
 518 {
 519     sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
 520     PCIHostState *phb = PCI_HOST_BRIDGE(s);
 521     char *namebuf;
 522     int i;
 523     PCIBus *bus;
 524
 525     if (sphb->index != -1) {
 526         hwaddr windows_base;
 527
 528         if ((sphb->buid != -1) || (sphb->dma_liobn != -1)
 529             || (sphb->mem_win_addr != -1)
 530             || (sphb->io_win_addr != -1)
 531             || (sphb->msi_win_addr != -1)) {
 532             fprintf(stderr, "Either \"index\" or other parameters must"
 533                     " be specified for PAPR PHB, not both\n");
 534             return -1;
 535         }
 536
 537         sphb->buid = SPAPR_PCI_BASE_BUID + sphb->index;
 538         sphb->dma_liobn = SPAPR_PCI_BASE_LIOBN + sphb->index;
 539
 540         windows_base = SPAPR_PCI_WINDOW_BASE
 541             + sphb->index * SPAPR_PCI_WINDOW_SPACING;
 542         sphb->mem_win_addr = windows_base + SPAPR_PCI_MMIO_WIN_OFF;
 543         sphb->io_win_addr = windows_base + SPAPR_PCI_IO_WIN_OFF;
 544         sphb->msi_win_addr = windows_base + SPAPR_PCI_MSI_WIN_OFF;
 545     }
 546
 547     if (sphb->buid == -1) {
 548         fprintf(stderr, "BUID not specified for PHB\n");
 549         return -1;
 550     }
 551
 552     if (sphb->dma_liobn == -1) {
 553         fprintf(stderr, "LIOBN not specified for PHB\n");
 554         return -1;
 555     }
 556
 557     if (sphb->mem_win_addr == -1) {
 558         fprintf(stderr, "Memory window address not specified for PHB\n");
 559         return -1;
 560     }
 561
 562     if (sphb->io_win_addr == -1) {
 563         fprintf(stderr, "IO window address not specified for PHB\n");
 564         return -1;
 565     }
 566
 567     if (sphb->msi_win_addr == -1) {
 568         fprintf(stderr, "MSI window address not specified for PHB\n");
 569         return -1;
 570     }
 571
 572     if (find_phb(spapr, sphb->buid)) {
 573         fprintf(stderr, "PCI host bridges must have unique BUIDs\n");
 574         return -1;
 575     }
 576
 577     sphb->dtbusname = g_strdup_printf("pci@%" PRIx64, sphb->buid);
 578     if (!sphb->busname) {
 579         sphb->busname = sphb->dtbusname;
 580     }
 581
 582     namebuf = alloca(strlen(sphb->dtbusname) + 32);
 583
 584     /* Initialize memory regions */
 585     sprintf(namebuf, "%s.mmio", sphb->dtbusname);
 586     memory_region_init(&sphb->memspace, namebuf, INT64_MAX);
 587
 588     sprintf(namebuf, "%s.mmio-alias", sphb->dtbusname);
 589     memory_region_init_alias(&sphb->memwindow, namebuf, &sphb->memspace,
 590                              SPAPR_PCI_MEM_WIN_BUS_OFFSET, sphb->mem_win_size);
 591     memory_region_add_subregion(get_system_memory(), sphb->mem_win_addr,
 592                                 &sphb->memwindow);
 593
 594     /* On ppc, we only have MMIO no specific IO space from the CPU
 595      * perspective.  In theory we ought to be able to embed the PCI IO
 596      * memory region direction in the system memory space.  However,
 597      * if any of the IO BAR subregions use the old_portio mechanism,
 598      * that won't be processed properly unless accessed from the
 599      * system io address space.  This hack to bounce things via
 600      * system_io works around the problem until all the users of
 601      * old_portion are updated */
 602     sprintf(namebuf, "%s.io", sphb->dtbusname);
 603     memory_region_init(&sphb->iospace, namebuf, SPAPR_PCI_IO_WIN_SIZE);
 604     /* FIXME: fix to support multiple PHBs */
 605     memory_region_add_subregion(get_system_io(), 0, &sphb->iospace);
 606
 607     sprintf(namebuf, "%s.io-alias", sphb->dtbusname);
 608     memory_region_init_io(&sphb->iowindow, &spapr_io_ops, sphb,
 609                           namebuf, SPAPR_PCI_IO_WIN_SIZE);
 610     memory_region_add_subregion(get_system_memory(), sphb->io_win_addr,
 611                                 &sphb->iowindow);
 612
 613     /* As MSI/MSIX interrupts trigger by writing at MSI/MSIX vectors,
 614      * we need to allocate some memory to catch those writes coming
 615      * from msi_notify()/msix_notify() */
 616     if (msi_supported) {
 617         sprintf(namebuf, "%s.msi", sphb->dtbusname);
 618         memory_region_init_io(&sphb->msiwindow, &spapr_msi_ops, sphb,
 619                               namebuf, SPAPR_MSIX_MAX_DEVS * 0x10000);
 620         memory_region_add_subregion(get_system_memory(), sphb->msi_win_addr,
 621                                     &sphb->msiwindow);
 622     }
 623
 624     bus = pci_register_bus(DEVICE(s), sphb->busname,
 625                            pci_spapr_set_irq, pci_spapr_map_irq, sphb,
 626                            &sphb->memspace, &sphb->iospace,
 627                            PCI_DEVFN(0, 0), PCI_NUM_PINS, TYPE_PCI_BUS);
 628     phb->bus = bus;
 629
 630     sphb->dma_window_start = 0;
 631     sphb->dma_window_size = 0x40000000;
 632     sphb->dma = spapr_tce_new_dma_context(sphb->dma_liobn, sphb->dma_window_size);
 633     if (!sphb->dma) {
 634         fprintf(stderr, "Unable to create TCE table for %s\n", sphb->dtbusname);
 635         return -1;
 636     }
 637     pci_setup_iommu(bus, spapr_pci_dma_context_fn, sphb);
 638
 639     QLIST_INSERT_HEAD(&spapr->phbs, sphb, list);
 640
 641     /* Initialize the LSI table */
 642     for (i = 0; i < PCI_NUM_PINS; i++) {
 643         uint32_t irq;
 644
 645         irq = spapr_allocate_lsi(0);
 646         if (!irq) {
 647             return -1;
 648         }
 649
 650         sphb->lsi_table[i].irq = irq;
 651     }
 652
 653     return 0;
 654 }
 655
 656 static void spapr_phb_reset(DeviceState *qdev)
 657 {
 658     SysBusDevice *s = SYS_BUS_DEVICE(qdev);
 659     sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
 660
 661     /* Reset the IOMMU state */
 662     spapr_tce_reset(sphb->dma);
 663 }
 664
 665 static Property spapr_phb_properties[] = {
 666     DEFINE_PROP_STRING("busname", sPAPRPHBState, busname),
 667     DEFINE_PROP_INT32("index", sPAPRPHBState, index, -1),
 668     DEFINE_PROP_HEX64("buid", sPAPRPHBState, buid, -1),
 669     DEFINE_PROP_HEX32("liobn", sPAPRPHBState, dma_liobn, -1),
 670     DEFINE_PROP_HEX64("mem_win_addr", sPAPRPHBState, mem_win_addr, -1),
 671     DEFINE_PROP_HEX64("mem_win_size", sPAPRPHBState, mem_win_size,
 672                       SPAPR_PCI_MMIO_WIN_SIZE),
 673     DEFINE_PROP_HEX64("io_win_addr", sPAPRPHBState, io_win_addr, -1),
 674     DEFINE_PROP_HEX64("io_win_size", sPAPRPHBState, io_win_size,
 675                       SPAPR_PCI_IO_WIN_SIZE),
 676     DEFINE_PROP_HEX64("msi_win_addr", sPAPRPHBState, msi_win_addr, -1),
 677     DEFINE_PROP_END_OF_LIST(),
 678 };
 679
 680 static void spapr_phb_class_init(ObjectClass *klass, void *data)
 681 {
 682     SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
 683     DeviceClass *dc = DEVICE_CLASS(klass);
 684
 685     sdc->init = spapr_phb_init;
 686     dc->props = spapr_phb_properties;
 687     dc->reset = spapr_phb_reset;
 688 }
 689
 690 static const TypeInfo spapr_phb_info = {
 691     .name          = TYPE_SPAPR_PCI_HOST_BRIDGE,
 692     .parent        = TYPE_PCI_HOST_BRIDGE,
 693     .instance_size = sizeof(sPAPRPHBState),
 694     .class_init    = spapr_phb_class_init,
 695 };
 696
 697 PCIHostState *spapr_create_phb(sPAPREnvironment *spapr, int index,
 698                                const char *busname)
 699 {
 700     DeviceState *dev;
 701
 702     dev = qdev_create(NULL, TYPE_SPAPR_PCI_HOST_BRIDGE);
 703     qdev_prop_set_uint32(dev, "index", index);
 704     qdev_prop_set_string(dev, "busname", busname);
 705     qdev_init_nofail(dev);
 706
 707     return PCI_HOST_BRIDGE(dev);
 708 }
 709
 710 /* Macros to operate with address in OF binding to PCI */
 711 #define b_x(x, p, l)    (((x) & ((1<<(l))-1)) << (p))
 712 #define b_n(x)          b_x((x), 31, 1) /* 0 if relocatable */
 713 #define b_p(x)          b_x((x), 30, 1) /* 1 if prefetchable */
 714 #define b_t(x)          b_x((x), 29, 1) /* 1 if the address is aliased */
 715 #define b_ss(x)         b_x((x), 24, 2) /* the space code */
 716 #define b_bbbbbbbb(x)   b_x((x), 16, 8) /* bus number */
 717 #define b_ddddd(x)      b_x((x), 11, 5) /* device number */
 718 #define b_fff(x)        b_x((x), 8, 3)  /* function number */
 719 #define b_rrrrrrrr(x)   b_x((x), 0, 8)  /* register number */
 720
 721 int spapr_populate_pci_dt(sPAPRPHBState *phb,
 722                           uint32_t xics_phandle,
 723                           void *fdt)
 724 {
 725     int bus_off, i, j;
 726     char nodename[256];
 727     uint32_t bus_range[] = { cpu_to_be32(0), cpu_to_be32(0xff) };
 728     struct {
 729         uint32_t hi;
 730         uint64_t child;
 731         uint64_t parent;
 732         uint64_t size;
 733     } QEMU_PACKED ranges[] = {
 734         {
 735             cpu_to_be32(b_ss(1)), cpu_to_be64(0),
 736             cpu_to_be64(phb->io_win_addr),
 737             cpu_to_be64(memory_region_size(&phb->iospace)),
 738         },
 739         {
 740             cpu_to_be32(b_ss(2)), cpu_to_be64(SPAPR_PCI_MEM_WIN_BUS_OFFSET),
 741             cpu_to_be64(phb->mem_win_addr),
 742             cpu_to_be64(memory_region_size(&phb->memwindow)),
 743         },
 744     };
 745     uint64_t bus_reg[] = { cpu_to_be64(phb->buid), 0 };
 746     uint32_t interrupt_map_mask[] = {
 747         cpu_to_be32(b_ddddd(-1)|b_fff(0)), 0x0, 0x0, cpu_to_be32(-1)};
 748     uint32_t interrupt_map[PCI_SLOT_MAX * PCI_NUM_PINS][7];
 749
 750     /* Start populating the FDT */
 751     sprintf(nodename, "pci@%" PRIx64, phb->buid);
 752     bus_off = fdt_add_subnode(fdt, 0, nodename);
 753     if (bus_off < 0) {
 754         return bus_off;
 755     }
 756
 757 #define _FDT(exp) \
 758     do { \
 759         int ret = (exp);                                           \
 760         if (ret < 0) {                                             \
 761             return ret;                                            \
 762         }                                                          \
 763     } while (0)
 764
 765     /* Write PHB properties */
 766     _FDT(fdt_setprop_string(fdt, bus_off, "device_type", "pci"));
 767     _FDT(fdt_setprop_string(fdt, bus_off, "compatible", "IBM,Logical_PHB"));
 768     _FDT(fdt_setprop_cell(fdt, bus_off, "#address-cells", 0x3));
 769     _FDT(fdt_setprop_cell(fdt, bus_off, "#size-cells", 0x2));
 770     _FDT(fdt_setprop_cell(fdt, bus_off, "#interrupt-cells", 0x1));
 771     _FDT(fdt_setprop(fdt, bus_off, "used-by-rtas", NULL, 0));
 772     _FDT(fdt_setprop(fdt, bus_off, "bus-range", &bus_range, sizeof(bus_range)));
 773     _FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof(ranges)));
 774     _FDT(fdt_setprop(fdt, bus_off, "reg", &bus_reg, sizeof(bus_reg)));
 775     _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pci-config-space-type", 0x1));
 776
 777     /* Build the interrupt-map, this must matches what is done
 778      * in pci_spapr_map_irq
 779      */
 780     _FDT(fdt_setprop(fdt, bus_off, "interrupt-map-mask",
 781                      &interrupt_map_mask, sizeof(interrupt_map_mask)));
 782     for (i = 0; i < PCI_SLOT_MAX; i++) {
 783         for (j = 0; j < PCI_NUM_PINS; j++) {
 784             uint32_t *irqmap = interrupt_map[i*PCI_NUM_PINS + j];
 785             int lsi_num = pci_spapr_swizzle(i, j);
 786
 787             irqmap[0] = cpu_to_be32(b_ddddd(i)|b_fff(0));
 788             irqmap[1] = 0;
 789             irqmap[2] = 0;
 790             irqmap[3] = cpu_to_be32(j+1);
 791             irqmap[4] = cpu_to_be32(xics_phandle);
 792             irqmap[5] = cpu_to_be32(phb->lsi_table[lsi_num].irq);
 793             irqmap[6] = cpu_to_be32(0x8);
 794         }
 795     }
 796     /* Write interrupt map */
 797     _FDT(fdt_setprop(fdt, bus_off, "interrupt-map", &interrupt_map,
 798                      sizeof(interrupt_map)));
 799
 800     spapr_dma_dt(fdt, bus_off, "ibm,dma-window",
 801                  phb->dma_liobn, phb->dma_window_start,
 802                  phb->dma_window_size);
 803
 804     return 0;
 805 }
 806
 807 void spapr_pci_rtas_init(void)
 808 {
 809     spapr_rtas_register("read-pci-config", rtas_read_pci_config);
 810     spapr_rtas_register("write-pci-config", rtas_write_pci_config);
 811     spapr_rtas_register("ibm,read-pci-config", rtas_ibm_read_pci_config);
 812     spapr_rtas_register("ibm,write-pci-config", rtas_ibm_write_pci_config);
 813     if (msi_supported) {
 814         spapr_rtas_register("ibm,query-interrupt-source-number",
 815                             rtas_ibm_query_interrupt_source_number);
 816         spapr_rtas_register("ibm,change-msi", rtas_ibm_change_msi);
 817     }
 818 }
 819
 820 static void spapr_pci_register_types(void)
 821 {
 822     type_register_static(&spapr_phb_info);
 823 }
 824
 825 type_init(spapr_pci_register_types)