hw/pci-host/q35.c

   1 /*
   2  * QEMU MCH/ICH9 PCI Bridge Emulation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  * Copyright (c) 2009, 2010, 2011
   6  *               Isaku Yamahata <yamahata at valinux co jp>
   7  *               VA Linux Systems Japan K.K.
   8  * Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
   9  *
  10  * This is based on piix.c, but heavily modified.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to deal
  14  * in the Software without restriction, including without limitation the rights
  15  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  16  * copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  25  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  28  * THE SOFTWARE.
  29  */
  30
  31 #include "qemu/osdep.h"
  32 #include "qemu/log.h"
  33 #include "hw/i386/pc.h"
  34 #include "hw/pci-host/q35.h"
  35 #include "hw/qdev-properties.h"
  36 #include "migration/vmstate.h"
  37 #include "qapi/error.h"
  38 #include "qapi/visitor.h"
  39 #include "qemu/module.h"
  40
  41 /****************************************************************************
  42  * Q35 host
  43  */
  44
  45 #define Q35_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 35)
  46
  47 static void q35_host_realize(DeviceState *dev, Error **errp)
  48 {
  49     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
  50     Q35PCIHost *s = Q35_HOST_DEVICE(dev);
  51     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
  52
  53     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
  54     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);
  55
  56     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
  57     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);
  58
  59     /* register q35 0xcf8 port as coalesced pio */
  60     memory_region_set_flush_coalesced(&pci->data_mem);
  61     memory_region_add_coalescing(&pci->conf_mem, 0, 4);
  62
  63     pci->bus = pci_root_bus_new(DEVICE(s), "pcie.0",
  64                                 s->mch.pci_address_space,
  65                                 s->mch.address_space_io,
  66                                 0, TYPE_PCIE_BUS);
  67     PC_MACHINE(qdev_get_machine())->bus = pci->bus;
  68     pci->bypass_iommu =
  69         PC_MACHINE(qdev_get_machine())->default_bus_bypass_iommu;
  70     qdev_realize(DEVICE(&s->mch), BUS(pci->bus), &error_fatal);
  71 }
  72
  73 static const char *q35_host_root_bus_path(PCIHostState *host_bridge,
  74                                           PCIBus *rootbus)
  75 {
  76     Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);
  77
  78      /* For backwards compat with old device paths */
  79     if (s->mch.short_root_bus) {
  80         return "0000";
  81     }
  82     return "0000:00";
  83 }
  84
  85 static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,
  86                                         const char *name, void *opaque,
  87                                         Error **errp)
  88 {
  89     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
  90     uint64_t val64;
  91     uint32_t value;
  92
  93     val64 = range_is_empty(&s->mch.pci_hole)
  94         ? 0 : range_lob(&s->mch.pci_hole);
  95     value = val64;
  96     assert(value == val64);
  97     visit_type_uint32(v, name, &value, errp);
  98 }
  99
 100 static void q35_host_get_pci_hole_end(Object *obj, Visitor *v,
 101                                       const char *name, void *opaque,
 102                                       Error **errp)
 103 {
 104     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
 105     uint64_t val64;
 106     uint32_t value;
 107
 108     val64 = range_is_empty(&s->mch.pci_hole)
 109         ? 0 : range_upb(&s->mch.pci_hole) + 1;
 110     value = val64;
 111     assert(value == val64);
 112     visit_type_uint32(v, name, &value, errp);
 113 }
 114
 115 /*
 116  * The 64bit PCI hole start is set by the Guest firmware
 117  * as the address of the first 64bit PCI MEM resource.
 118  * If no PCI device has resources on the 64bit area,
 119  * the 64bit PCI hole will start after "over 4G RAM" and the
 120  * reserved space for memory hotplug if any.
 121  */
 122 static uint64_t q35_host_get_pci_hole64_start_value(Object *obj)
 123 {
 124     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 125     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
 126     Range w64;
 127     uint64_t value;
 128
 129     pci_bus_get_w64_range(h->bus, &w64);
 130     value = range_is_empty(&w64) ? 0 : range_lob(&w64);
 131     if (!value && s->pci_hole64_fix) {
 132         value = pc_pci_hole64_start();
 133     }
 134     return value;
 135 }
 136
 137 static void q35_host_get_pci_hole64_start(Object *obj, Visitor *v,
 138                                           const char *name, void *opaque,
 139                                           Error **errp)
 140 {
 141     uint64_t hole64_start = q35_host_get_pci_hole64_start_value(obj);
 142
 143     visit_type_uint64(v, name, &hole64_start, errp);
 144 }
 145
 146 /*
 147  * The 64bit PCI hole end is set by the Guest firmware
 148  * as the address of the last 64bit PCI MEM resource.
 149  * Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE
 150  * that can be configured by the user.
 151  */
 152 static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
 153                                         const char *name, void *opaque,
 154                                         Error **errp)
 155 {
 156     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 157     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
 158     uint64_t hole64_start = q35_host_get_pci_hole64_start_value(obj);
 159     Range w64;
 160     uint64_t value, hole64_end;
 161
 162     pci_bus_get_w64_range(h->bus, &w64);
 163     value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1;
 164     hole64_end = ROUND_UP(hole64_start + s->mch.pci_hole64_size, 1ULL << 30);
 165     if (s->pci_hole64_fix && value < hole64_end) {
 166         value = hole64_end;
 167     }
 168     visit_type_uint64(v, name, &value, errp);
 169 }
 170
 171 /*
 172  * NOTE: setting defaults for the mch.* fields in this table
 173  * doesn't work, because mch is a separate QOM object that is
 174  * zeroed by the object_initialize(&s->mch, ...) call inside
 175  * q35_host_initfn().  The default values for those
 176  * properties need to be initialized manually by
 177  * q35_host_initfn() after the object_initialize() call.
 178  */
 179 static Property q35_host_props[] = {
 180     DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
 181                         MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
 182     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
 183                      mch.pci_hole64_size, Q35_PCI_HOST_HOLE64_SIZE_DEFAULT),
 184     DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
 185     DEFINE_PROP_SIZE(PCI_HOST_BELOW_4G_MEM_SIZE, Q35PCIHost,
 186                      mch.below_4g_mem_size, 0),
 187     DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MEM_SIZE, Q35PCIHost,
 188                      mch.above_4g_mem_size, 0),
 189     DEFINE_PROP_BOOL("x-pci-hole64-fix", Q35PCIHost, pci_hole64_fix, true),
 190     DEFINE_PROP_END_OF_LIST(),
 191 };
 192
 193 static void q35_host_class_init(ObjectClass *klass, void *data)
 194 {
 195     DeviceClass *dc = DEVICE_CLASS(klass);
 196     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 197
 198     hc->root_bus_path = q35_host_root_bus_path;
 199     dc->realize = q35_host_realize;
 200     device_class_set_props(dc, q35_host_props);
 201     /* Reason: needs to be wired up by pc_q35_init */
 202     dc->user_creatable = false;
 203     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 204     dc->fw_name = "pci";
 205 }
 206
 207 static void q35_host_initfn(Object *obj)
 208 {
 209     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
 210     PCIHostState *phb = PCI_HOST_BRIDGE(obj);
 211     PCIExpressHost *pehb = PCIE_HOST_BRIDGE(obj);
 212
 213     memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
 214                           "pci-conf-idx", 4);
 215     memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
 216                           "pci-conf-data", 4);
 217
 218     object_initialize_child(OBJECT(s), "mch", &s->mch, TYPE_MCH_PCI_DEVICE);
 219     qdev_prop_set_int32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
 220     qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);
 221     /* mch's object_initialize resets the default value, set it again */
 222     qdev_prop_set_uint64(DEVICE(s), PCI_HOST_PROP_PCI_HOLE64_SIZE,
 223                          Q35_PCI_HOST_HOLE64_SIZE_DEFAULT);
 224     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "uint32",
 225                         q35_host_get_pci_hole_start,
 226                         NULL, NULL, NULL);
 227
 228     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "uint32",
 229                         q35_host_get_pci_hole_end,
 230                         NULL, NULL, NULL);
 231
 232     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "uint64",
 233                         q35_host_get_pci_hole64_start,
 234                         NULL, NULL, NULL);
 235
 236     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "uint64",
 237                         q35_host_get_pci_hole64_end,
 238                         NULL, NULL, NULL);
 239
 240     object_property_add_uint64_ptr(obj, PCIE_HOST_MCFG_SIZE,
 241                                    &pehb->size, OBJ_PROP_FLAG_READ);
 242
 243     object_property_add_link(obj, MCH_HOST_PROP_RAM_MEM, TYPE_MEMORY_REGION,
 244                              (Object **) &s->mch.ram_memory,
 245                              qdev_prop_allow_set_link_before_realize, 0);
 246
 247     object_property_add_link(obj, MCH_HOST_PROP_PCI_MEM, TYPE_MEMORY_REGION,
 248                              (Object **) &s->mch.pci_address_space,
 249                              qdev_prop_allow_set_link_before_realize, 0);
 250
 251     object_property_add_link(obj, MCH_HOST_PROP_SYSTEM_MEM, TYPE_MEMORY_REGION,
 252                              (Object **) &s->mch.system_memory,
 253                              qdev_prop_allow_set_link_before_realize, 0);
 254
 255     object_property_add_link(obj, MCH_HOST_PROP_IO_MEM, TYPE_MEMORY_REGION,
 256                              (Object **) &s->mch.address_space_io,
 257                              qdev_prop_allow_set_link_before_realize, 0);
 258 }
 259
 260 static const TypeInfo q35_host_info = {
 261     .name       = TYPE_Q35_HOST_DEVICE,
 262     .parent     = TYPE_PCIE_HOST_BRIDGE,
 263     .instance_size = sizeof(Q35PCIHost),
 264     .instance_init = q35_host_initfn,
 265     .class_init = q35_host_class_init,
 266 };
 267
 268 /****************************************************************************
 269  * MCH D0:F0
 270  */
 271
 272 static uint64_t blackhole_read(void *ptr, hwaddr reg, unsigned size)
 273 {
 274     return 0xffffffff;
 275 }
 276
 277 static void blackhole_write(void *opaque, hwaddr addr, uint64_t val,
 278                             unsigned width)
 279 {
 280     /* nothing */
 281 }
 282
 283 static const MemoryRegionOps blackhole_ops = {
 284     .read = blackhole_read,
 285     .write = blackhole_write,
 286     .endianness = DEVICE_NATIVE_ENDIAN,
 287     .valid.min_access_size = 1,
 288     .valid.max_access_size = 4,
 289     .impl.min_access_size = 4,
 290     .impl.max_access_size = 4,
 291     .endianness = DEVICE_LITTLE_ENDIAN,
 292 };
 293
 294 /* PCIe MMCFG */
 295 static void mch_update_pciexbar(MCHPCIState *mch)
 296 {
 297     PCIDevice *pci_dev = PCI_DEVICE(mch);
 298     BusState *bus = qdev_get_parent_bus(DEVICE(mch));
 299     PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);
 300
 301     uint64_t pciexbar;
 302     int enable;
 303     uint64_t addr;
 304     uint64_t addr_mask;
 305     uint32_t length;
 306
 307     pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
 308     enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
 309     addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
 310     switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
 311     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
 312         length = 256 * 1024 * 1024;
 313         break;
 314     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
 315         length = 128 * 1024 * 1024;
 316         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK |
 317             MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 318         break;
 319     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
 320         length = 64 * 1024 * 1024;
 321         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 322         break;
 323     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
 324         qemu_log_mask(LOG_GUEST_ERROR, "Q35: Reserved PCIEXBAR LENGTH\n");
 325         return;
 326     default:
 327         abort();
 328     }
 329     addr = pciexbar & addr_mask;
 330     pcie_host_mmcfg_update(pehb, enable, addr, length);
 331 }
 332
 333 /* PAM */
 334 static void mch_update_pam(MCHPCIState *mch)
 335 {
 336     PCIDevice *pd = PCI_DEVICE(mch);
 337     int i;
 338
 339     memory_region_transaction_begin();
 340     for (i = 0; i < 13; i++) {
 341         pam_update(&mch->pam_regions[i], i,
 342                    pd->config[MCH_HOST_BRIDGE_PAM0 + DIV_ROUND_UP(i, 2)]);
 343     }
 344     memory_region_transaction_commit();
 345 }
 346
 347 /* SMRAM */
 348 static void mch_update_smram(MCHPCIState *mch)
 349 {
 350     PCIDevice *pd = PCI_DEVICE(mch);
 351     bool h_smrame = (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_H_SMRAME);
 352     uint32_t tseg_size;
 353
 354     /* implement SMRAM.D_LCK */
 355     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & MCH_HOST_BRIDGE_SMRAM_D_LCK) {
 356         pd->config[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_OPEN;
 357         pd->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK_LCK;
 358         pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK_LCK;
 359     }
 360
 361     memory_region_transaction_begin();
 362
 363     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_D_OPEN) {
 364         /* Hide (!) low SMRAM if H_SMRAME = 1 */
 365         memory_region_set_enabled(&mch->smram_region, h_smrame);
 366         /* Show high SMRAM if H_SMRAME = 1 */
 367         memory_region_set_enabled(&mch->open_high_smram, h_smrame);
 368     } else {
 369         /* Hide high SMRAM and low SMRAM */
 370         memory_region_set_enabled(&mch->smram_region, true);
 371         memory_region_set_enabled(&mch->open_high_smram, false);
 372     }
 373
 374     if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_G_SMRAME) {
 375         memory_region_set_enabled(&mch->low_smram, !h_smrame);
 376         memory_region_set_enabled(&mch->high_smram, h_smrame);
 377     } else {
 378         memory_region_set_enabled(&mch->low_smram, false);
 379         memory_region_set_enabled(&mch->high_smram, false);
 380     }
 381
 382     if (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_T_EN) {
 383         switch (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &
 384                 MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
 385         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_1MB:
 386             tseg_size = 1024 * 1024;
 387             break;
 388         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_2MB:
 389             tseg_size = 1024 * 1024 * 2;
 390             break;
 391         case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_8MB:
 392             tseg_size = 1024 * 1024 * 8;
 393             break;
 394         default:
 395             tseg_size = 1024 * 1024 * (uint32_t)mch->ext_tseg_mbytes;
 396             break;
 397         }
 398     } else {
 399         tseg_size = 0;
 400     }
 401     memory_region_del_subregion(mch->system_memory, &mch->tseg_blackhole);
 402     memory_region_set_enabled(&mch->tseg_blackhole, tseg_size);
 403     memory_region_set_size(&mch->tseg_blackhole, tseg_size);
 404     memory_region_add_subregion_overlap(mch->system_memory,
 405                                         mch->below_4g_mem_size - tseg_size,
 406                                         &mch->tseg_blackhole, 1);
 407
 408     memory_region_set_enabled(&mch->tseg_window, tseg_size);
 409     memory_region_set_size(&mch->tseg_window, tseg_size);
 410     memory_region_set_address(&mch->tseg_window,
 411                               mch->below_4g_mem_size - tseg_size);
 412     memory_region_set_alias_offset(&mch->tseg_window,
 413                                    mch->below_4g_mem_size - tseg_size);
 414
 415     memory_region_transaction_commit();
 416 }
 417
 418 static void mch_update_ext_tseg_mbytes(MCHPCIState *mch)
 419 {
 420     PCIDevice *pd = PCI_DEVICE(mch);
 421     uint8_t *reg = pd->config + MCH_HOST_BRIDGE_EXT_TSEG_MBYTES;
 422
 423     if (mch->ext_tseg_mbytes > 0 &&
 424         pci_get_word(reg) == MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_QUERY) {
 425         pci_set_word(reg, mch->ext_tseg_mbytes);
 426     }
 427 }
 428
 429 static void mch_update_smbase_smram(MCHPCIState *mch)
 430 {
 431     PCIDevice *pd = PCI_DEVICE(mch);
 432     uint8_t *reg = pd->config + MCH_HOST_BRIDGE_F_SMBASE;
 433     bool lck;
 434
 435     if (!mch->has_smram_at_smbase) {
 436         return;
 437     }
 438
 439     if (*reg == MCH_HOST_BRIDGE_F_SMBASE_QUERY) {
 440         pd->wmask[MCH_HOST_BRIDGE_F_SMBASE] =
 441             MCH_HOST_BRIDGE_F_SMBASE_LCK;
 442         *reg = MCH_HOST_BRIDGE_F_SMBASE_IN_RAM;
 443         return;
 444     }
 445
 446     /*
 447      * default/reset state, discard written value
 448      * which will disable SMRAM balackhole at SMBASE
 449      */
 450     if (pd->wmask[MCH_HOST_BRIDGE_F_SMBASE] == 0xff) {
 451         *reg = 0x00;
 452     }
 453
 454     memory_region_transaction_begin();
 455     if (*reg & MCH_HOST_BRIDGE_F_SMBASE_LCK) {
 456         /* disable all writes */
 457         pd->wmask[MCH_HOST_BRIDGE_F_SMBASE] &=
 458             ~MCH_HOST_BRIDGE_F_SMBASE_LCK;
 459         *reg = MCH_HOST_BRIDGE_F_SMBASE_LCK;
 460         lck = true;
 461     } else {
 462         lck = false;
 463     }
 464     memory_region_set_enabled(&mch->smbase_blackhole, lck);
 465     memory_region_set_enabled(&mch->smbase_window, lck);
 466     memory_region_transaction_commit();
 467 }
 468
 469 static void mch_write_config(PCIDevice *d,
 470                               uint32_t address, uint32_t val, int len)
 471 {
 472     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 473
 474     pci_default_write_config(d, address, val, len);
 475
 476     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
 477                        MCH_HOST_BRIDGE_PAM_SIZE)) {
 478         mch_update_pam(mch);
 479     }
 480
 481     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
 482                        MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
 483         mch_update_pciexbar(mch);
 484     }
 485
 486     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
 487                        MCH_HOST_BRIDGE_SMRAM_SIZE)) {
 488         mch_update_smram(mch);
 489     }
 490
 491     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,
 492                        MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_SIZE)) {
 493         mch_update_ext_tseg_mbytes(mch);
 494     }
 495
 496     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_F_SMBASE, 1)) {
 497         mch_update_smbase_smram(mch);
 498     }
 499 }
 500
 501 static void mch_update(MCHPCIState *mch)
 502 {
 503     mch_update_pciexbar(mch);
 504     mch_update_pam(mch);
 505     mch_update_smram(mch);
 506     mch_update_ext_tseg_mbytes(mch);
 507     mch_update_smbase_smram(mch);
 508
 509     /*
 510      * pci hole goes from end-of-low-ram to io-apic.
 511      * mmconfig will be excluded by the dsdt builder.
 512      */
 513     range_set_bounds(&mch->pci_hole,
 514                      mch->below_4g_mem_size,
 515                      IO_APIC_DEFAULT_ADDRESS - 1);
 516 }
 517
 518 static int mch_post_load(void *opaque, int version_id)
 519 {
 520     MCHPCIState *mch = opaque;
 521     mch_update(mch);
 522     return 0;
 523 }
 524
 525 static const VMStateDescription vmstate_mch = {
 526     .name = "mch",
 527     .version_id = 1,
 528     .minimum_version_id = 1,
 529     .post_load = mch_post_load,
 530     .fields = (VMStateField[]) {
 531         VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
 532         /* Used to be smm_enabled, which was basically always zero because
 533          * SeaBIOS hardly uses SMM.  SMRAM is now handled by CPU code.
 534          */
 535         VMSTATE_UNUSED(1),
 536         VMSTATE_END_OF_LIST()
 537     }
 538 };
 539
 540 static void mch_reset(DeviceState *qdev)
 541 {
 542     PCIDevice *d = PCI_DEVICE(qdev);
 543     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 544
 545     pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
 546                  MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
 547
 548     d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
 549     d->config[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_DEFAULT;
 550     d->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK;
 551     d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK;
 552
 553     if (mch->ext_tseg_mbytes > 0) {
 554         pci_set_word(d->config + MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,
 555                      MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_QUERY);
 556     }
 557
 558     d->config[MCH_HOST_BRIDGE_F_SMBASE] = 0;
 559     d->wmask[MCH_HOST_BRIDGE_F_SMBASE] = 0xff;
 560
 561     mch_update(mch);
 562 }
 563
 564 static void mch_realize(PCIDevice *d, Error **errp)
 565 {
 566     int i;
 567     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 568
 569     if (mch->ext_tseg_mbytes > MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_MAX) {
 570         error_setg(errp, "invalid extended-tseg-mbytes value: %" PRIu16,
 571                    mch->ext_tseg_mbytes);
 572         return;
 573     }
 574
 575     /* setup pci memory mapping */
 576     pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
 577                            mch->pci_address_space);
 578
 579     /* if *disabled* show SMRAM to all CPUs */
 580     memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
 581                              mch->pci_address_space, MCH_HOST_BRIDGE_SMRAM_C_BASE,
 582                              MCH_HOST_BRIDGE_SMRAM_C_SIZE);
 583     memory_region_add_subregion_overlap(mch->system_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
 584                                         &mch->smram_region, 1);
 585     memory_region_set_enabled(&mch->smram_region, true);
 586
 587     memory_region_init_alias(&mch->open_high_smram, OBJECT(mch), "smram-open-high",
 588                              mch->ram_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
 589                              MCH_HOST_BRIDGE_SMRAM_C_SIZE);
 590     memory_region_add_subregion_overlap(mch->system_memory, 0xfeda0000,
 591                                         &mch->open_high_smram, 1);
 592     memory_region_set_enabled(&mch->open_high_smram, false);
 593
 594     /* smram, as seen by SMM CPUs */
 595     memory_region_init(&mch->smram, OBJECT(mch), "smram", 4 * GiB);
 596     memory_region_set_enabled(&mch->smram, true);
 597     memory_region_init_alias(&mch->low_smram, OBJECT(mch), "smram-low",
 598                              mch->ram_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
 599                              MCH_HOST_BRIDGE_SMRAM_C_SIZE);
 600     memory_region_set_enabled(&mch->low_smram, true);
 601     memory_region_add_subregion(&mch->smram, MCH_HOST_BRIDGE_SMRAM_C_BASE,
 602                                 &mch->low_smram);
 603     memory_region_init_alias(&mch->high_smram, OBJECT(mch), "smram-high",
 604                              mch->ram_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
 605                              MCH_HOST_BRIDGE_SMRAM_C_SIZE);
 606     memory_region_set_enabled(&mch->high_smram, true);
 607     memory_region_add_subregion(&mch->smram, 0xfeda0000, &mch->high_smram);
 608
 609     memory_region_init_io(&mch->tseg_blackhole, OBJECT(mch),
 610                           &blackhole_ops, NULL,
 611                           "tseg-blackhole", 0);
 612     memory_region_set_enabled(&mch->tseg_blackhole, false);
 613     memory_region_add_subregion_overlap(mch->system_memory,
 614                                         mch->below_4g_mem_size,
 615                                         &mch->tseg_blackhole, 1);
 616
 617     memory_region_init_alias(&mch->tseg_window, OBJECT(mch), "tseg-window",
 618                              mch->ram_memory, mch->below_4g_mem_size, 0);
 619     memory_region_set_enabled(&mch->tseg_window, false);
 620     memory_region_add_subregion(&mch->smram, mch->below_4g_mem_size,
 621                                 &mch->tseg_window);
 622
 623     /*
 624      * This is not what hardware does, so it's QEMU specific hack.
 625      * See commit message for details.
 626      */
 627     memory_region_init_io(&mch->smbase_blackhole, OBJECT(mch), &blackhole_ops,
 628                           NULL, "smbase-blackhole",
 629                           MCH_HOST_BRIDGE_SMBASE_SIZE);
 630     memory_region_set_enabled(&mch->smbase_blackhole, false);
 631     memory_region_add_subregion_overlap(mch->system_memory,
 632                                         MCH_HOST_BRIDGE_SMBASE_ADDR,
 633                                         &mch->smbase_blackhole, 1);
 634
 635     memory_region_init_alias(&mch->smbase_window, OBJECT(mch),
 636                              "smbase-window", mch->ram_memory,
 637                              MCH_HOST_BRIDGE_SMBASE_ADDR,
 638                              MCH_HOST_BRIDGE_SMBASE_SIZE);
 639     memory_region_set_enabled(&mch->smbase_window, false);
 640     memory_region_add_subregion(&mch->smram, MCH_HOST_BRIDGE_SMBASE_ADDR,
 641                                 &mch->smbase_window);
 642
 643     object_property_add_const_link(qdev_get_machine(), "smram",
 644                                    OBJECT(&mch->smram));
 645
 646     init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
 647              mch->pci_address_space, &mch->pam_regions[0],
 648              PAM_BIOS_BASE, PAM_BIOS_SIZE);
 649     for (i = 0; i < ARRAY_SIZE(mch->pam_regions) - 1; ++i) {
 650         init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
 651                  mch->pci_address_space, &mch->pam_regions[i+1],
 652                  PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);
 653     }
 654 }
 655
 656 uint64_t mch_mcfg_base(void)
 657 {
 658     bool ambiguous;
 659     Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
 660     if (!o) {
 661         return 0;
 662     }
 663     return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
 664 }
 665
 666 static Property mch_props[] = {
 667     DEFINE_PROP_UINT16("extended-tseg-mbytes", MCHPCIState, ext_tseg_mbytes,
 668                        16),
 669     DEFINE_PROP_BOOL("smbase-smram", MCHPCIState, has_smram_at_smbase, true),
 670     DEFINE_PROP_END_OF_LIST(),
 671 };
 672
 673 static void mch_class_init(ObjectClass *klass, void *data)
 674 {
 675     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 676     DeviceClass *dc = DEVICE_CLASS(klass);
 677
 678     k->realize = mch_realize;
 679     k->config_write = mch_write_config;
 680     dc->reset = mch_reset;
 681     device_class_set_props(dc, mch_props);
 682     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 683     dc->desc = "Host bridge";
 684     dc->vmsd = &vmstate_mch;
 685     k->vendor_id = PCI_VENDOR_ID_INTEL;
 686     /*
 687      * The 'q35' machine type implements an Intel Series 3 chipset,
 688      * of which there are several variants. The key difference between
 689      * the 82P35 MCH ('p35') and 82Q35 GMCH ('q35') variants is that
 690      * the latter has an integrated graphics adapter. QEMU does not
 691      * implement integrated graphics, so uses the PCI ID for the 82P35
 692      * chipset.
 693      */
 694     k->device_id = PCI_DEVICE_ID_INTEL_P35_MCH;
 695     k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
 696     k->class_id = PCI_CLASS_BRIDGE_HOST;
 697     /*
 698      * PCI-facing part of the host bridge, not usable without the
 699      * host-facing part, which can't be device_add'ed, yet.
 700      */
 701     dc->user_creatable = false;
 702 }
 703
 704 static const TypeInfo mch_info = {
 705     .name = TYPE_MCH_PCI_DEVICE,
 706     .parent = TYPE_PCI_DEVICE,
 707     .instance_size = sizeof(MCHPCIState),
 708     .class_init = mch_class_init,
 709     .interfaces = (InterfaceInfo[]) {
 710         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 711         { },
 712     },
 713 };
 714
 715 static void q35_register(void)
 716 {
 717     type_register_static(&mch_info);
 718     type_register_static(&q35_host_info);
 719 }
 720
 721 type_init(q35_register);