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_pci.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 #include "hw/hw.h"
  31 #include "hw/pci-host/q35.h"
  32 #include "qapi/visitor.h"
  33
  34 /****************************************************************************
  35  * Q35 host
  36  */
  37
  38 static void q35_host_realize(DeviceState *dev, Error **errp)
  39 {
  40     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
  41     Q35PCIHost *s = Q35_HOST_DEVICE(dev);
  42     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
  43
  44     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
  45     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);
  46
  47     sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
  48     sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);
  49
  50     if (pcie_host_init(PCIE_HOST_BRIDGE(s)) < 0) {
  51         error_setg(errp, "failed to initialize pcie host");
  52         return;
  53     }
  54     pci->bus = pci_bus_new(DEVICE(s), "pcie.0",
  55                            s->mch.pci_address_space, s->mch.address_space_io,
  56                            0, TYPE_PCIE_BUS);
  57     qdev_set_parent_bus(DEVICE(&s->mch), BUS(pci->bus));
  58     qdev_init_nofail(DEVICE(&s->mch));
  59 }
  60
  61 static const char *q35_host_root_bus_path(PCIHostState *host_bridge,
  62                                           PCIBus *rootbus)
  63 {
  64     Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);
  65
  66      /* For backwards compat with old device paths */
  67     if (s->mch.short_root_bus) {
  68         return "0000";
  69     }
  70     return "0000:00";
  71 }
  72
  73 static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,
  74                                         void *opaque, const char *name,
  75                                         Error **errp)
  76 {
  77     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
  78     uint32_t value = s->mch.pci_info.w32.begin;
  79
  80     visit_type_uint32(v, &value, name, errp);
  81 }
  82
  83 static void q35_host_get_pci_hole_end(Object *obj, Visitor *v,
  84                                       void *opaque, const char *name,
  85                                       Error **errp)
  86 {
  87     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
  88     uint32_t value = s->mch.pci_info.w32.end;
  89
  90     visit_type_uint32(v, &value, name, errp);
  91 }
  92
  93 static void q35_host_get_pci_hole64_start(Object *obj, Visitor *v,
  94                                           void *opaque, const char *name,
  95                                           Error **errp)
  96 {
  97     PCIHostState *h = PCI_HOST_BRIDGE(obj);
  98     Range w64;
  99
 100     pci_bus_get_w64_range(h->bus, &w64);
 101
 102     visit_type_uint64(v, &w64.begin, name, errp);
 103 }
 104
 105 static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
 106                                         void *opaque, const char *name,
 107                                         Error **errp)
 108 {
 109     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 110     Range w64;
 111
 112     pci_bus_get_w64_range(h->bus, &w64);
 113
 114     visit_type_uint64(v, &w64.end, name, errp);
 115 }
 116
 117 static void q35_host_get_mmcfg_size(Object *obj, Visitor *v,
 118                                     void *opaque, const char *name,
 119                                     Error **errp)
 120 {
 121     PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
 122     uint32_t value = e->size;
 123
 124     visit_type_uint32(v, &value, name, errp);
 125 }
 126
 127 static Property mch_props[] = {
 128     DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
 129                         MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
 130     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
 131                      mch.pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),
 132     DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
 133     DEFINE_PROP_END_OF_LIST(),
 134 };
 135
 136 static void q35_host_class_init(ObjectClass *klass, void *data)
 137 {
 138     DeviceClass *dc = DEVICE_CLASS(klass);
 139     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 140
 141     hc->root_bus_path = q35_host_root_bus_path;
 142     dc->realize = q35_host_realize;
 143     dc->props = mch_props;
 144     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 145     dc->fw_name = "pci";
 146 }
 147
 148 static void q35_host_initfn(Object *obj)
 149 {
 150     Q35PCIHost *s = Q35_HOST_DEVICE(obj);
 151     PCIHostState *phb = PCI_HOST_BRIDGE(obj);
 152
 153     memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
 154                           "pci-conf-idx", 4);
 155     memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
 156                           "pci-conf-data", 4);
 157
 158     object_initialize(&s->mch, sizeof(s->mch), TYPE_MCH_PCI_DEVICE);
 159     object_property_add_child(OBJECT(s), "mch", OBJECT(&s->mch), NULL);
 160     qdev_prop_set_uint32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
 161     qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);
 162
 163     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
 164                         q35_host_get_pci_hole_start,
 165                         NULL, NULL, NULL, NULL);
 166
 167     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "int",
 168                         q35_host_get_pci_hole_end,
 169                         NULL, NULL, NULL, NULL);
 170
 171     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "int",
 172                         q35_host_get_pci_hole64_start,
 173                         NULL, NULL, NULL, NULL);
 174
 175     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "int",
 176                         q35_host_get_pci_hole64_end,
 177                         NULL, NULL, NULL, NULL);
 178
 179     object_property_add(obj, PCIE_HOST_MCFG_SIZE, "int",
 180                         q35_host_get_mmcfg_size,
 181                         NULL, NULL, NULL, NULL);
 182
 183     /* Leave enough space for the biggest MCFG BAR */
 184     /* TODO: this matches current bios behaviour, but
 185      * it's not a power of two, which means an MTRR
 186      * can't cover it exactly.
 187      */
 188     s->mch.pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT +
 189         MCH_HOST_BRIDGE_PCIEXBAR_MAX;
 190     s->mch.pci_info.w32.end = IO_APIC_DEFAULT_ADDRESS;
 191 }
 192
 193 static const TypeInfo q35_host_info = {
 194     .name       = TYPE_Q35_HOST_DEVICE,
 195     .parent     = TYPE_PCIE_HOST_BRIDGE,
 196     .instance_size = sizeof(Q35PCIHost),
 197     .instance_init = q35_host_initfn,
 198     .class_init = q35_host_class_init,
 199 };
 200
 201 /****************************************************************************
 202  * MCH D0:F0
 203  */
 204
 205 /* PCIe MMCFG */
 206 static void mch_update_pciexbar(MCHPCIState *mch)
 207 {
 208     PCIDevice *pci_dev = PCI_DEVICE(mch);
 209     BusState *bus = qdev_get_parent_bus(DEVICE(mch));
 210     PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);
 211
 212     uint64_t pciexbar;
 213     int enable;
 214     uint64_t addr;
 215     uint64_t addr_mask;
 216     uint32_t length;
 217
 218     pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
 219     enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
 220     addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
 221     switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
 222     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
 223         length = 256 * 1024 * 1024;
 224         break;
 225     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
 226         length = 128 * 1024 * 1024;
 227         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK |
 228             MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 229         break;
 230     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
 231         length = 64 * 1024 * 1024;
 232         addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
 233         break;
 234     case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
 235     default:
 236         enable = 0;
 237         length = 0;
 238         abort();
 239         break;
 240     }
 241     addr = pciexbar & addr_mask;
 242     pcie_host_mmcfg_update(pehb, enable, addr, length);
 243     /* Leave enough space for the MCFG BAR */
 244     /*
 245      * TODO: this matches current bios behaviour, but it's not a power of two,
 246      * which means an MTRR can't cover it exactly.
 247      */
 248     if (enable) {
 249         mch->pci_info.w32.begin = addr + length;
 250     } else {
 251         mch->pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
 252     }
 253 }
 254
 255 /* PAM */
 256 static void mch_update_pam(MCHPCIState *mch)
 257 {
 258     PCIDevice *pd = PCI_DEVICE(mch);
 259     int i;
 260
 261     memory_region_transaction_begin();
 262     for (i = 0; i < 13; i++) {
 263         pam_update(&mch->pam_regions[i], i,
 264                    pd->config[MCH_HOST_BRIDGE_PAM0 + ((i + 1) / 2)]);
 265     }
 266     memory_region_transaction_commit();
 267 }
 268
 269 /* SMRAM */
 270 static void mch_update_smram(MCHPCIState *mch)
 271 {
 272     PCIDevice *pd = PCI_DEVICE(mch);
 273
 274     memory_region_transaction_begin();
 275     smram_update(&mch->smram_region, pd->config[MCH_HOST_BRIDGE_SMRAM],
 276                     mch->smm_enabled);
 277     memory_region_transaction_commit();
 278 }
 279
 280 static void mch_set_smm(int smm, void *arg)
 281 {
 282     MCHPCIState *mch = arg;
 283     PCIDevice *pd = PCI_DEVICE(mch);
 284
 285     memory_region_transaction_begin();
 286     smram_set_smm(&mch->smm_enabled, smm, pd->config[MCH_HOST_BRIDGE_SMRAM],
 287                     &mch->smram_region);
 288     memory_region_transaction_commit();
 289 }
 290
 291 static void mch_write_config(PCIDevice *d,
 292                               uint32_t address, uint32_t val, int len)
 293 {
 294     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 295
 296     /* XXX: implement SMRAM.D_LOCK */
 297     pci_default_write_config(d, address, val, len);
 298
 299     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
 300                        MCH_HOST_BRIDGE_PAM_SIZE)) {
 301         mch_update_pam(mch);
 302     }
 303
 304     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
 305                        MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
 306         mch_update_pciexbar(mch);
 307     }
 308
 309     if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
 310                        MCH_HOST_BRIDGE_SMRAM_SIZE)) {
 311         mch_update_smram(mch);
 312     }
 313 }
 314
 315 static void mch_update(MCHPCIState *mch)
 316 {
 317     mch_update_pciexbar(mch);
 318     mch_update_pam(mch);
 319     mch_update_smram(mch);
 320 }
 321
 322 static int mch_post_load(void *opaque, int version_id)
 323 {
 324     MCHPCIState *mch = opaque;
 325     mch_update(mch);
 326     return 0;
 327 }
 328
 329 static const VMStateDescription vmstate_mch = {
 330     .name = "mch",
 331     .version_id = 1,
 332     .minimum_version_id = 1,
 333     .minimum_version_id_old = 1,
 334     .post_load = mch_post_load,
 335     .fields = (VMStateField []) {
 336         VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
 337         VMSTATE_UINT8(smm_enabled, MCHPCIState),
 338         VMSTATE_END_OF_LIST()
 339     }
 340 };
 341
 342 static void mch_reset(DeviceState *qdev)
 343 {
 344     PCIDevice *d = PCI_DEVICE(qdev);
 345     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 346
 347     pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
 348                  MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
 349
 350     d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
 351
 352     mch_update(mch);
 353 }
 354
 355 static int mch_init(PCIDevice *d)
 356 {
 357     int i;
 358     MCHPCIState *mch = MCH_PCI_DEVICE(d);
 359
 360     /* setup pci memory mapping */
 361     pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
 362                            mch->pci_address_space);
 363
 364     /* smram */
 365     cpu_smm_register(&mch_set_smm, mch);
 366     memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
 367                              mch->pci_address_space, 0xa0000, 0x20000);
 368     memory_region_add_subregion_overlap(mch->system_memory, 0xa0000,
 369                                         &mch->smram_region, 1);
 370     memory_region_set_enabled(&mch->smram_region, false);
 371     init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory, mch->pci_address_space,
 372              &mch->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
 373     for (i = 0; i < 12; ++i) {
 374         init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory, mch->pci_address_space,
 375                  &mch->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
 376                  PAM_EXPAN_SIZE);
 377     }
 378     return 0;
 379 }
 380
 381 uint64_t mch_mcfg_base(void)
 382 {
 383     bool ambiguous;
 384     Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
 385     if (!o) {
 386         return 0;
 387     }
 388     return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
 389 }
 390
 391 static void mch_class_init(ObjectClass *klass, void *data)
 392 {
 393     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 394     DeviceClass *dc = DEVICE_CLASS(klass);
 395
 396     k->init = mch_init;
 397     k->config_write = mch_write_config;
 398     dc->reset = mch_reset;
 399     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 400     dc->desc = "Host bridge";
 401     dc->vmsd = &vmstate_mch;
 402     k->vendor_id = PCI_VENDOR_ID_INTEL;
 403     k->device_id = PCI_DEVICE_ID_INTEL_Q35_MCH;
 404     k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
 405     k->class_id = PCI_CLASS_BRIDGE_HOST;
 406     /*
 407      * PCI-facing part of the host bridge, not usable without the
 408      * host-facing part, which can't be device_add'ed, yet.
 409      */
 410     dc->cannot_instantiate_with_device_add_yet = true;
 411 }
 412
 413 static const TypeInfo mch_info = {
 414     .name = TYPE_MCH_PCI_DEVICE,
 415     .parent = TYPE_PCI_DEVICE,
 416     .instance_size = sizeof(MCHPCIState),
 417     .class_init = mch_class_init,
 418 };
 419
 420 static void q35_register(void)
 421 {
 422     type_register_static(&mch_info);
 423     type_register_static(&q35_host_info);
 424 }
 425
 426 type_init(q35_register);