hw/pci_bridge.c

   1 /*
   2  * QEMU PCI bus manager
   3  *
   4  * Copyright (c) 2004 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 dea
   8
   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
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26 /*
  27  * split out from pci.c
  28  * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
  29  *                    VA Linux Systems Japan K.K.
  30  */
  31
  32 #include "pci_bridge.h"
  33 #include "pci_internals.h"
  34 #include "range.h"
  35
  36 /* PCI bridge subsystem vendor ID helper functions */
  37 #define PCI_SSVID_SIZEOF        8
  38 #define PCI_SSVID_SVID          4
  39 #define PCI_SSVID_SSID          6
  40
  41 int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset,
  42                           uint16_t svid, uint16_t ssid)
  43 {
  44     int pos;
  45     pos = pci_add_capability(dev, PCI_CAP_ID_SSVID, offset, PCI_SSVID_SIZEOF);
  46     if (pos < 0) {
  47         return pos;
  48     }
  49
  50     pci_set_word(dev->config + pos + PCI_SSVID_SVID, svid);
  51     pci_set_word(dev->config + pos + PCI_SSVID_SSID, ssid);
  52     return pos;
  53 }
  54
  55 /* Accessor function to get parent bridge device from pci bus. */
  56 PCIDevice *pci_bridge_get_device(PCIBus *bus)
  57 {
  58     return bus->parent_dev;
  59 }
  60
  61 /* Accessor function to get secondary bus from pci-to-pci bridge device */
  62 PCIBus *pci_bridge_get_sec_bus(PCIBridge *br)
  63 {
  64     return &br->sec_bus;
  65 }
  66
  67 static uint32_t pci_config_get_io_base(const PCIDevice *d,
  68                                        uint32_t base, uint32_t base_upper16)
  69 {
  70     uint32_t val;
  71
  72     val = ((uint32_t)d->config[base] & PCI_IO_RANGE_MASK) << 8;
  73     if (d->config[base] & PCI_IO_RANGE_TYPE_32) {
  74         val |= (uint32_t)pci_get_word(d->config + base_upper16) << 16;
  75     }
  76     return val;
  77 }
  78
  79 static pcibus_t pci_config_get_memory_base(const PCIDevice *d, uint32_t base)
  80 {
  81     return ((pcibus_t)pci_get_word(d->config + base) & PCI_MEMORY_RANGE_MASK)
  82         << 16;
  83 }
  84
  85 static pcibus_t pci_config_get_pref_base(const PCIDevice *d,
  86                                          uint32_t base, uint32_t upper)
  87 {
  88     pcibus_t tmp;
  89     pcibus_t val;
  90
  91     tmp = (pcibus_t)pci_get_word(d->config + base);
  92     val = (tmp & PCI_PREF_RANGE_MASK) << 16;
  93     if (tmp & PCI_PREF_RANGE_TYPE_64) {
  94         val |= (pcibus_t)pci_get_long(d->config + upper) << 32;
  95     }
  96     return val;
  97 }
  98
  99 /* accessor function to get bridge filtering base address */
 100 pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type)
 101 {
 102     pcibus_t base;
 103     if (type & PCI_BASE_ADDRESS_SPACE_IO) {
 104         base = pci_config_get_io_base(bridge,
 105                                       PCI_IO_BASE, PCI_IO_BASE_UPPER16);
 106     } else {
 107         if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
 108             base = pci_config_get_pref_base(
 109                 bridge, PCI_PREF_MEMORY_BASE, PCI_PREF_BASE_UPPER32);
 110         } else {
 111             base = pci_config_get_memory_base(bridge, PCI_MEMORY_BASE);
 112         }
 113     }
 114
 115     return base;
 116 }
 117
 118 /* accessor funciton to get bridge filtering limit */
 119 pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type)
 120 {
 121     pcibus_t limit;
 122     if (type & PCI_BASE_ADDRESS_SPACE_IO) {
 123         limit = pci_config_get_io_base(bridge,
 124                                       PCI_IO_LIMIT, PCI_IO_LIMIT_UPPER16);
 125         limit |= 0xfff;         /* PCI bridge spec 3.2.5.6. */
 126     } else {
 127         if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
 128             limit = pci_config_get_pref_base(
 129                 bridge, PCI_PREF_MEMORY_LIMIT, PCI_PREF_LIMIT_UPPER32);
 130         } else {
 131             limit = pci_config_get_memory_base(bridge, PCI_MEMORY_LIMIT);
 132         }
 133         limit |= 0xfffff;       /* PCI bridge spec 3.2.5.{1, 8}. */
 134     }
 135     return limit;
 136 }
 137
 138 static void pci_bridge_init_alias(PCIBridge *bridge, MemoryRegion *alias,
 139                                   uint8_t type, const char *name,
 140                                   MemoryRegion *space,
 141                                   MemoryRegion *parent_space,
 142                                   bool enabled)
 143 {
 144     pcibus_t base = pci_bridge_get_base(&bridge->dev, type);
 145     pcibus_t limit = pci_bridge_get_limit(&bridge->dev, type);
 146     /* TODO: this doesn't handle base = 0 limit = 2^64 - 1 correctly.
 147      * Apparently no way to do this with existing memory APIs. */
 148     pcibus_t size = enabled && limit >= base ? limit + 1 - base : 0;
 149
 150     memory_region_init_alias(alias, name, space, base, size);
 151     memory_region_add_subregion_overlap(parent_space, base, alias, 1);
 152 }
 153
 154 static void pci_bridge_cleanup_alias(MemoryRegion *alias,
 155                                      MemoryRegion *parent_space)
 156 {
 157     memory_region_del_subregion(parent_space, alias);
 158     memory_region_destroy(alias);
 159 }
 160
 161 static void pci_bridge_region_init(PCIBridge *br)
 162 {
 163     PCIBus *parent = br->dev.bus;
 164     uint16_t cmd = pci_get_word(br->dev.config + PCI_COMMAND);
 165
 166     pci_bridge_init_alias(br, &br->alias_pref_mem,
 167                           PCI_BASE_ADDRESS_MEM_PREFETCH,
 168                           "pci_bridge_pref_mem",
 169                           &br->address_space_mem,
 170                           parent->address_space_mem,
 171                           cmd & PCI_COMMAND_MEMORY);
 172     pci_bridge_init_alias(br, &br->alias_mem,
 173                           PCI_BASE_ADDRESS_SPACE_MEMORY,
 174                           "pci_bridge_mem",
 175                           &br->address_space_mem,
 176                           parent->address_space_mem,
 177                           cmd & PCI_COMMAND_MEMORY);
 178     pci_bridge_init_alias(br, &br->alias_io,
 179                           PCI_BASE_ADDRESS_SPACE_IO,
 180                           "pci_bridge_io",
 181                           &br->address_space_io,
 182                           parent->address_space_io,
 183                           cmd & PCI_COMMAND_IO);
 184    /* TODO: optinal VGA and VGA palette snooping support. */
 185 }
 186
 187 static void pci_bridge_region_cleanup(PCIBridge *br)
 188 {
 189     PCIBus *parent = br->dev.bus;
 190     pci_bridge_cleanup_alias(&br->alias_io,
 191                              parent->address_space_io);
 192     pci_bridge_cleanup_alias(&br->alias_mem,
 193                              parent->address_space_mem);
 194     pci_bridge_cleanup_alias(&br->alias_pref_mem,
 195                              parent->address_space_mem);
 196 }
 197
 198 static void pci_bridge_update_mappings(PCIBridge *br)
 199 {
 200     /* Make updates atomic to: handle the case of one VCPU updating the bridge
 201      * while another accesses an unaffected region. */
 202     memory_region_transaction_begin();
 203     pci_bridge_region_cleanup(br);
 204     pci_bridge_region_init(br);
 205     memory_region_transaction_commit();
 206 }
 207
 208 /* default write_config function for PCI-to-PCI bridge */
 209 void pci_bridge_write_config(PCIDevice *d,
 210                              uint32_t address, uint32_t val, int len)
 211 {
 212     PCIBridge *s = container_of(d, PCIBridge, dev);
 213     uint16_t oldctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
 214     uint16_t newctl;
 215
 216     pci_default_write_config(d, address, val, len);
 217
 218     if (ranges_overlap(address, len, PCI_COMMAND, 2) ||
 219
 220         /* io base/limit */
 221         ranges_overlap(address, len, PCI_IO_BASE, 2) ||
 222
 223         /* memory base/limit, prefetchable base/limit and
 224            io base/limit upper 16 */
 225         ranges_overlap(address, len, PCI_MEMORY_BASE, 20)) {
 226         pci_bridge_update_mappings(s);
 227     }
 228
 229     newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
 230     if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) {
 231         /* Trigger hot reset on 0->1 transition. */
 232         pci_bus_reset(&s->sec_bus);
 233     }
 234 }
 235
 236 void pci_bridge_disable_base_limit(PCIDevice *dev)
 237 {
 238     uint8_t *conf = dev->config;
 239
 240     pci_byte_test_and_set_mask(conf + PCI_IO_BASE,
 241                                PCI_IO_RANGE_MASK & 0xff);
 242     pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
 243                                  PCI_IO_RANGE_MASK & 0xff);
 244     pci_word_test_and_set_mask(conf + PCI_MEMORY_BASE,
 245                                PCI_MEMORY_RANGE_MASK & 0xffff);
 246     pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
 247                                  PCI_MEMORY_RANGE_MASK & 0xffff);
 248     pci_word_test_and_set_mask(conf + PCI_PREF_MEMORY_BASE,
 249                                PCI_PREF_RANGE_MASK & 0xffff);
 250     pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
 251                                  PCI_PREF_RANGE_MASK & 0xffff);
 252     pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);
 253     pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);
 254 }
 255
 256 /* reset bridge specific configuration registers */
 257 void pci_bridge_reset(DeviceState *qdev)
 258 {
 259     PCIDevice *dev = PCI_DEVICE(qdev);
 260     uint8_t *conf = dev->config;
 261
 262     conf[PCI_PRIMARY_BUS] = 0;
 263     conf[PCI_SECONDARY_BUS] = 0;
 264     conf[PCI_SUBORDINATE_BUS] = 0;
 265     conf[PCI_SEC_LATENCY_TIMER] = 0;
 266
 267     /*
 268      * the default values for base/limit registers aren't specified
 269      * in the PCI-to-PCI-bridge spec. So we don't thouch them here.
 270      * Each implementation can override it.
 271      * typical implementation does
 272      * zero base/limit registers or
 273      * disable forwarding: pci_bridge_disable_base_limit()
 274      * If disable forwarding is wanted, call pci_bridge_disable_base_limit()
 275      * after this function.
 276      */
 277     pci_byte_test_and_clear_mask(conf + PCI_IO_BASE,
 278                                  PCI_IO_RANGE_MASK & 0xff);
 279     pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
 280                                  PCI_IO_RANGE_MASK & 0xff);
 281     pci_word_test_and_clear_mask(conf + PCI_MEMORY_BASE,
 282                                  PCI_MEMORY_RANGE_MASK & 0xffff);
 283     pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,
 284                                  PCI_MEMORY_RANGE_MASK & 0xffff);
 285     pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_BASE,
 286                                  PCI_PREF_RANGE_MASK & 0xffff);
 287     pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,
 288                                  PCI_PREF_RANGE_MASK & 0xffff);
 289     pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);
 290     pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);
 291
 292     pci_set_word(conf + PCI_BRIDGE_CONTROL, 0);
 293 }
 294
 295 /* default qdev initialization function for PCI-to-PCI bridge */
 296 int pci_bridge_initfn(PCIDevice *dev)
 297 {
 298     PCIBus *parent = dev->bus;
 299     PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
 300     PCIBus *sec_bus = &br->sec_bus;
 301
 302     pci_word_test_and_set_mask(dev->config + PCI_STATUS,
 303                                PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
 304     pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_PCI);
 305     dev->config[PCI_HEADER_TYPE] =
 306         (dev->config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTI_FUNCTION) |
 307         PCI_HEADER_TYPE_BRIDGE;
 308     pci_set_word(dev->config + PCI_SEC_STATUS,
 309                  PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
 310
 311     /*
 312      * If we don't specify the name, the bus will be addressed as <id>.0, where
 313      * id is the device id.
 314      * Since PCI Bridge devices have a single bus each, we don't need the index:
 315      * let users address the bus using the device name.
 316      */
 317     if (!br->bus_name && dev->qdev.id && *dev->qdev.id) {
 318             br->bus_name = dev->qdev.id;
 319     }
 320
 321     qbus_create_inplace(&sec_bus->qbus, TYPE_PCI_BUS, &dev->qdev,
 322                         br->bus_name);
 323     sec_bus->parent_dev = dev;
 324     sec_bus->map_irq = br->map_irq;
 325     sec_bus->address_space_mem = &br->address_space_mem;
 326     memory_region_init(&br->address_space_mem, "pci_bridge_pci", INT64_MAX);
 327     sec_bus->address_space_io = &br->address_space_io;
 328     memory_region_init(&br->address_space_io, "pci_bridge_io", 65536);
 329     pci_bridge_region_init(br);
 330     QLIST_INIT(&sec_bus->child);
 331     QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling);
 332     return 0;
 333 }
 334
 335 /* default qdev clean up function for PCI-to-PCI bridge */
 336 int pci_bridge_exitfn(PCIDevice *pci_dev)
 337 {
 338     PCIBridge *s = DO_UPCAST(PCIBridge, dev, pci_dev);
 339     assert(QLIST_EMPTY(&s->sec_bus.child));
 340     QLIST_REMOVE(&s->sec_bus, sibling);
 341     pci_bridge_region_cleanup(s);
 342     memory_region_destroy(&s->address_space_mem);
 343     memory_region_destroy(&s->address_space_io);
 344     /* qbus_free() is called automatically by qdev_free() */
 345     return 0;
 346 }
 347
 348 /*
 349  * before qdev initialization(qdev_init()), this function sets bus_name and
 350  * map_irq callback which are necessry for pci_bridge_initfn() to
 351  * initialize bus.
 352  */
 353 void pci_bridge_map_irq(PCIBridge *br, const char* bus_name,
 354                         pci_map_irq_fn map_irq)
 355 {
 356     br->map_irq = map_irq;
 357     br->bus_name = bus_name;
 358 }