hw/pci-host/i440fx.c

   1 /*
   2  * QEMU i440FX PCI Bridge Emulation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu/units.h"
  27 #include "qemu/range.h"
  28 #include "hw/i386/pc.h"
  29 #include "hw/pci/pci.h"
  30 #include "hw/pci/pci_host.h"
  31 #include "hw/pci-host/i440fx.h"
  32 #include "hw/qdev-properties.h"
  33 #include "hw/sysbus.h"
  34 #include "qapi/error.h"
  35 #include "migration/vmstate.h"
  36 #include "qapi/visitor.h"
  37 #include "qemu/error-report.h"
  38 #include "qom/object.h"
  39
  40 /*
  41  * I440FX chipset data sheet.
  42  * https://wiki.qemu.org/File:29054901.pdf
  43  */
  44
  45 OBJECT_DECLARE_SIMPLE_TYPE(I440FXState, I440FX_PCI_HOST_BRIDGE)
  46
  47 struct I440FXState {
  48     PCIHostState parent_obj;
  49     Range pci_hole;
  50     uint64_t pci_hole64_size;
  51     bool pci_hole64_fix;
  52     uint32_t short_root_bus;
  53 };
  54
  55 #define I440FX_PAM      0x59
  56 #define I440FX_PAM_SIZE 7
  57 #define I440FX_SMRAM    0x72
  58
  59 /* Keep it 2G to comply with older win32 guests */
  60 #define I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 31)
  61
  62 /* Older coreboot versions (4.0 and older) read a config register that doesn't
  63  * exist in real hardware, to get the RAM size from QEMU.
  64  */
  65 #define I440FX_COREBOOT_RAM_SIZE 0x57
  66
  67 static void i440fx_update_memory_mappings(PCII440FXState *d)
  68 {
  69     int i;
  70     PCIDevice *pd = PCI_DEVICE(d);
  71
  72     memory_region_transaction_begin();
  73     for (i = 0; i < ARRAY_SIZE(d->pam_regions); i++) {
  74         pam_update(&d->pam_regions[i], i,
  75                    pd->config[I440FX_PAM + DIV_ROUND_UP(i, 2)]);
  76     }
  77     memory_region_set_enabled(&d->smram_region,
  78                               !(pd->config[I440FX_SMRAM] & SMRAM_D_OPEN));
  79     memory_region_set_enabled(&d->smram,
  80                               pd->config[I440FX_SMRAM] & SMRAM_G_SMRAME);
  81     memory_region_transaction_commit();
  82 }
  83
  84
  85 static void i440fx_write_config(PCIDevice *dev,
  86                                 uint32_t address, uint32_t val, int len)
  87 {
  88     PCII440FXState *d = I440FX_PCI_DEVICE(dev);
  89
  90     /* XXX: implement SMRAM.D_LOCK */
  91     pci_default_write_config(dev, address, val, len);
  92     if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
  93         range_covers_byte(address, len, I440FX_SMRAM)) {
  94         i440fx_update_memory_mappings(d);
  95     }
  96 }
  97
  98 static int i440fx_post_load(void *opaque, int version_id)
  99 {
 100     PCII440FXState *d = opaque;
 101
 102     i440fx_update_memory_mappings(d);
 103     return 0;
 104 }
 105
 106 static const VMStateDescription vmstate_i440fx = {
 107     .name = "I440FX",
 108     .version_id = 3,
 109     .minimum_version_id = 3,
 110     .post_load = i440fx_post_load,
 111     .fields = (VMStateField[]) {
 112         VMSTATE_PCI_DEVICE(parent_obj, PCII440FXState),
 113         /* Used to be smm_enabled, which was basically always zero because
 114          * SeaBIOS hardly uses SMM.  SMRAM is now handled by CPU code.
 115          */
 116         VMSTATE_UNUSED(1),
 117         VMSTATE_END_OF_LIST()
 118     }
 119 };
 120
 121 static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v,
 122                                               const char *name, void *opaque,
 123                                               Error **errp)
 124 {
 125     I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
 126     uint64_t val64;
 127     uint32_t value;
 128
 129     val64 = range_is_empty(&s->pci_hole) ? 0 : range_lob(&s->pci_hole);
 130     value = val64;
 131     assert(value == val64);
 132     visit_type_uint32(v, name, &value, errp);
 133 }
 134
 135 static void i440fx_pcihost_get_pci_hole_end(Object *obj, Visitor *v,
 136                                             const char *name, void *opaque,
 137                                             Error **errp)
 138 {
 139     I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
 140     uint64_t val64;
 141     uint32_t value;
 142
 143     val64 = range_is_empty(&s->pci_hole) ? 0 : range_upb(&s->pci_hole) + 1;
 144     value = val64;
 145     assert(value == val64);
 146     visit_type_uint32(v, name, &value, errp);
 147 }
 148
 149 /*
 150  * The 64bit PCI hole start is set by the Guest firmware
 151  * as the address of the first 64bit PCI MEM resource.
 152  * If no PCI device has resources on the 64bit area,
 153  * the 64bit PCI hole will start after "over 4G RAM" and the
 154  * reserved space for memory hotplug if any.
 155  */
 156 static uint64_t i440fx_pcihost_get_pci_hole64_start_value(Object *obj)
 157 {
 158     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 159     I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
 160     Range w64;
 161     uint64_t value;
 162
 163     pci_bus_get_w64_range(h->bus, &w64);
 164     value = range_is_empty(&w64) ? 0 : range_lob(&w64);
 165     if (!value && s->pci_hole64_fix) {
 166         value = pc_pci_hole64_start();
 167     }
 168     return value;
 169 }
 170
 171 static void i440fx_pcihost_get_pci_hole64_start(Object *obj, Visitor *v,
 172                                                 const char *name,
 173                                                 void *opaque, Error **errp)
 174 {
 175     uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj);
 176
 177     visit_type_uint64(v, name, &hole64_start, errp);
 178 }
 179
 180 /*
 181  * The 64bit PCI hole end is set by the Guest firmware
 182  * as the address of the last 64bit PCI MEM resource.
 183  * Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE
 184  * that can be configured by the user.
 185  */
 186 static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v,
 187                                               const char *name, void *opaque,
 188                                               Error **errp)
 189 {
 190     PCIHostState *h = PCI_HOST_BRIDGE(obj);
 191     I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
 192     uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj);
 193     Range w64;
 194     uint64_t value, hole64_end;
 195
 196     pci_bus_get_w64_range(h->bus, &w64);
 197     value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1;
 198     hole64_end = ROUND_UP(hole64_start + s->pci_hole64_size, 1ULL << 30);
 199     if (s->pci_hole64_fix && value < hole64_end) {
 200         value = hole64_end;
 201     }
 202     visit_type_uint64(v, name, &value, errp);
 203 }
 204
 205 static void i440fx_pcihost_initfn(Object *obj)
 206 {
 207     PCIHostState *s = PCI_HOST_BRIDGE(obj);
 208
 209     memory_region_init_io(&s->conf_mem, obj, &pci_host_conf_le_ops, s,
 210                           "pci-conf-idx", 4);
 211     memory_region_init_io(&s->data_mem, obj, &pci_host_data_le_ops, s,
 212                           "pci-conf-data", 4);
 213 }
 214
 215 static void i440fx_pcihost_realize(DeviceState *dev, Error **errp)
 216 {
 217     PCIHostState *s = PCI_HOST_BRIDGE(dev);
 218     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 219
 220     sysbus_add_io(sbd, 0xcf8, &s->conf_mem);
 221     sysbus_init_ioports(sbd, 0xcf8, 4);
 222
 223     sysbus_add_io(sbd, 0xcfc, &s->data_mem);
 224     sysbus_init_ioports(sbd, 0xcfc, 4);
 225
 226     /* register i440fx 0xcf8 port as coalesced pio */
 227     memory_region_set_flush_coalesced(&s->data_mem);
 228     memory_region_add_coalescing(&s->conf_mem, 0, 4);
 229 }
 230
 231 static void i440fx_realize(PCIDevice *dev, Error **errp)
 232 {
 233     dev->config[I440FX_SMRAM] = 0x02;
 234
 235     if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) {
 236         warn_report("i440fx doesn't support emulated iommu");
 237     }
 238 }
 239
 240 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
 241                     PCII440FXState **pi440fx_state,
 242                     MemoryRegion *address_space_mem,
 243                     MemoryRegion *address_space_io,
 244                     ram_addr_t ram_size,
 245                     ram_addr_t below_4g_mem_size,
 246                     ram_addr_t above_4g_mem_size,
 247                     MemoryRegion *pci_address_space,
 248                     MemoryRegion *ram_memory)
 249 {
 250     DeviceState *dev;
 251     PCIBus *b;
 252     PCIDevice *d;
 253     PCIHostState *s;
 254     PCII440FXState *f;
 255     unsigned i;
 256     I440FXState *i440fx;
 257
 258     dev = qdev_new(host_type);
 259     s = PCI_HOST_BRIDGE(dev);
 260     b = pci_root_bus_new(dev, NULL, pci_address_space,
 261                          address_space_io, 0, TYPE_PCI_BUS);
 262     s->bus = b;
 263     object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev));
 264     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 265
 266     d = pci_create_simple(b, 0, pci_type);
 267     *pi440fx_state = I440FX_PCI_DEVICE(d);
 268     f = *pi440fx_state;
 269     f->system_memory = address_space_mem;
 270     f->pci_address_space = pci_address_space;
 271     f->ram_memory = ram_memory;
 272
 273     i440fx = I440FX_PCI_HOST_BRIDGE(dev);
 274     range_set_bounds(&i440fx->pci_hole, below_4g_mem_size,
 275                      IO_APIC_DEFAULT_ADDRESS - 1);
 276
 277     /* setup pci memory mapping */
 278     pc_pci_as_mapping_init(OBJECT(f), f->system_memory,
 279                            f->pci_address_space);
 280
 281     /* if *disabled* show SMRAM to all CPUs */
 282     memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region",
 283                              f->pci_address_space, 0xa0000, 0x20000);
 284     memory_region_add_subregion_overlap(f->system_memory, 0xa0000,
 285                                         &f->smram_region, 1);
 286     memory_region_set_enabled(&f->smram_region, true);
 287
 288     /* smram, as seen by SMM CPUs */
 289     memory_region_init(&f->smram, OBJECT(d), "smram", 4 * GiB);
 290     memory_region_set_enabled(&f->smram, true);
 291     memory_region_init_alias(&f->low_smram, OBJECT(d), "smram-low",
 292                              f->ram_memory, 0xa0000, 0x20000);
 293     memory_region_set_enabled(&f->low_smram, true);
 294     memory_region_add_subregion(&f->smram, 0xa0000, &f->low_smram);
 295     object_property_add_const_link(qdev_get_machine(), "smram",
 296                                    OBJECT(&f->smram));
 297
 298     init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
 299              &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
 300     for (i = 0; i < ARRAY_SIZE(f->pam_regions) - 1; ++i) {
 301         init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
 302                  &f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
 303                  PAM_EXPAN_SIZE);
 304     }
 305
 306     ram_size = ram_size / 8 / 1024 / 1024;
 307     if (ram_size > 255) {
 308         ram_size = 255;
 309     }
 310     d->config[I440FX_COREBOOT_RAM_SIZE] = ram_size;
 311
 312     i440fx_update_memory_mappings(f);
 313
 314     return b;
 315 }
 316
 317 PCIBus *find_i440fx(void)
 318 {
 319     PCIHostState *s = OBJECT_CHECK(PCIHostState,
 320                                    object_resolve_path("/machine/i440fx", NULL),
 321                                    TYPE_PCI_HOST_BRIDGE);
 322     return s ? s->bus : NULL;
 323 }
 324
 325 static void i440fx_class_init(ObjectClass *klass, void *data)
 326 {
 327     DeviceClass *dc = DEVICE_CLASS(klass);
 328     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 329
 330     k->realize = i440fx_realize;
 331     k->config_write = i440fx_write_config;
 332     k->vendor_id = PCI_VENDOR_ID_INTEL;
 333     k->device_id = PCI_DEVICE_ID_INTEL_82441;
 334     k->revision = 0x02;
 335     k->class_id = PCI_CLASS_BRIDGE_HOST;
 336     dc->desc = "Host bridge";
 337     dc->vmsd = &vmstate_i440fx;
 338     /*
 339      * PCI-facing part of the host bridge, not usable without the
 340      * host-facing part, which can't be device_add'ed, yet.
 341      */
 342     dc->user_creatable = false;
 343     dc->hotpluggable   = false;
 344 }
 345
 346 static const TypeInfo i440fx_info = {
 347     .name          = TYPE_I440FX_PCI_DEVICE,
 348     .parent        = TYPE_PCI_DEVICE,
 349     .instance_size = sizeof(PCII440FXState),
 350     .class_init    = i440fx_class_init,
 351     .interfaces = (InterfaceInfo[]) {
 352         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 353         { },
 354     },
 355 };
 356
 357 static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
 358                                                 PCIBus *rootbus)
 359 {
 360     I440FXState *s = I440FX_PCI_HOST_BRIDGE(host_bridge);
 361
 362     /* For backwards compat with old device paths */
 363     if (s->short_root_bus) {
 364         return "0000";
 365     }
 366     return "0000:00";
 367 }
 368
 369 static Property i440fx_props[] = {
 370     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState,
 371                      pci_hole64_size, I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT),
 372     DEFINE_PROP_UINT32("short_root_bus", I440FXState, short_root_bus, 0),
 373     DEFINE_PROP_BOOL("x-pci-hole64-fix", I440FXState, pci_hole64_fix, true),
 374     DEFINE_PROP_END_OF_LIST(),
 375 };
 376
 377 static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
 378 {
 379     DeviceClass *dc = DEVICE_CLASS(klass);
 380     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 381
 382     hc->root_bus_path = i440fx_pcihost_root_bus_path;
 383     dc->realize = i440fx_pcihost_realize;
 384     dc->fw_name = "pci";
 385     device_class_set_props(dc, i440fx_props);
 386     /* Reason: needs to be wired up by pc_init1 */
 387     dc->user_creatable = false;
 388
 389     object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_START, "uint32",
 390                               i440fx_pcihost_get_pci_hole_start,
 391                               NULL, NULL, NULL);
 392
 393     object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_END, "uint32",
 394                               i440fx_pcihost_get_pci_hole_end,
 395                               NULL, NULL, NULL);
 396
 397     object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_START, "uint64",
 398                               i440fx_pcihost_get_pci_hole64_start,
 399                               NULL, NULL, NULL);
 400
 401     object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_END, "uint64",
 402                               i440fx_pcihost_get_pci_hole64_end,
 403                               NULL, NULL, NULL);
 404 }
 405
 406 static const TypeInfo i440fx_pcihost_info = {
 407     .name          = TYPE_I440FX_PCI_HOST_BRIDGE,
 408     .parent        = TYPE_PCI_HOST_BRIDGE,
 409     .instance_size = sizeof(I440FXState),
 410     .instance_init = i440fx_pcihost_initfn,
 411     .class_init    = i440fx_pcihost_class_init,
 412 };
 413
 414 static void i440fx_register_types(void)
 415 {
 416     type_register_static(&i440fx_info);
 417     type_register_static(&i440fx_pcihost_info);
 418 }
 419
 420 type_init(i440fx_register_types)