hw/pci-bridge/pci_expander_bridge.c

   1 /*
   2  * PCI Expander Bridge Device Emulation
   3  *
   4  * Copyright (C) 2015 Red Hat Inc
   5  *
   6  * Authors:
   7  *   Marcel Apfelbaum <marcel@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "hw/pci/pci.h"
  16 #include "hw/pci/pci_bus.h"
  17 #include "hw/pci/pci_host.h"
  18 #include "hw/pci/pci_bridge.h"
  19 #include "qemu/range.h"
  20 #include "qemu/error-report.h"
  21 #include "sysemu/numa.h"
  22
  23 #define TYPE_PXB_BUS "pxb-bus"
  24 #define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS)
  25
  26 #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus"
  27 #define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS)
  28
  29 typedef struct PXBBus {
  30     /*< private >*/
  31     PCIBus parent_obj;
  32     /*< public >*/
  33
  34     char bus_path[8];
  35 } PXBBus;
  36
  37 #define TYPE_PXB_DEVICE "pxb"
  38 #define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE)
  39
  40 #define TYPE_PXB_PCIE_DEVICE "pxb-pcie"
  41 #define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE)
  42
  43 typedef struct PXBDev {
  44     /*< private >*/
  45     PCIDevice parent_obj;
  46     /*< public >*/
  47
  48     uint8_t bus_nr;
  49     uint16_t numa_node;
  50 } PXBDev;
  51
  52 static PXBDev *convert_to_pxb(PCIDevice *dev)
  53 {
  54     return pci_bus_is_express(pci_get_bus(dev))
  55         ? PXB_PCIE_DEV(dev) : PXB_DEV(dev);
  56 }
  57
  58 static GList *pxb_dev_list;
  59
  60 #define TYPE_PXB_HOST "pxb-host"
  61
  62 static int pxb_bus_num(PCIBus *bus)
  63 {
  64     PXBDev *pxb = convert_to_pxb(bus->parent_dev);
  65
  66     return pxb->bus_nr;
  67 }
  68
  69 static bool pxb_is_root(PCIBus *bus)
  70 {
  71     return true; /* by definition */
  72 }
  73
  74 static uint16_t pxb_bus_numa_node(PCIBus *bus)
  75 {
  76     PXBDev *pxb = convert_to_pxb(bus->parent_dev);
  77
  78     return pxb->numa_node;
  79 }
  80
  81 static void pxb_bus_class_init(ObjectClass *class, void *data)
  82 {
  83     PCIBusClass *pbc = PCI_BUS_CLASS(class);
  84
  85     pbc->bus_num = pxb_bus_num;
  86     pbc->is_root = pxb_is_root;
  87     pbc->numa_node = pxb_bus_numa_node;
  88 }
  89
  90 static const TypeInfo pxb_bus_info = {
  91     .name          = TYPE_PXB_BUS,
  92     .parent        = TYPE_PCI_BUS,
  93     .instance_size = sizeof(PXBBus),
  94     .class_init    = pxb_bus_class_init,
  95 };
  96
  97 static const TypeInfo pxb_pcie_bus_info = {
  98     .name          = TYPE_PXB_PCIE_BUS,
  99     .parent        = TYPE_PCIE_BUS,
 100     .instance_size = sizeof(PXBBus),
 101     .class_init    = pxb_bus_class_init,
 102 };
 103
 104 static const char *pxb_host_root_bus_path(PCIHostState *host_bridge,
 105                                           PCIBus *rootbus)
 106 {
 107     PXBBus *bus = pci_bus_is_express(rootbus) ?
 108                   PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus);
 109
 110     snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus));
 111     return bus->bus_path;
 112 }
 113
 114 static char *pxb_host_ofw_unit_address(const SysBusDevice *dev)
 115 {
 116     const PCIHostState *pxb_host;
 117     const PCIBus *pxb_bus;
 118     const PXBDev *pxb_dev;
 119     int position;
 120     const DeviceState *pxb_dev_base;
 121     const PCIHostState *main_host;
 122     const SysBusDevice *main_host_sbd;
 123
 124     pxb_host = PCI_HOST_BRIDGE(dev);
 125     pxb_bus = pxb_host->bus;
 126     pxb_dev = convert_to_pxb(pxb_bus->parent_dev);
 127     position = g_list_index(pxb_dev_list, pxb_dev);
 128     assert(position >= 0);
 129
 130     pxb_dev_base = DEVICE(pxb_dev);
 131     main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent);
 132     main_host_sbd = SYS_BUS_DEVICE(main_host);
 133
 134     if (main_host_sbd->num_mmio > 0) {
 135         return g_strdup_printf(TARGET_FMT_plx ",%x",
 136                                main_host_sbd->mmio[0].addr, position + 1);
 137     }
 138     if (main_host_sbd->num_pio > 0) {
 139         return g_strdup_printf("i%04x,%x",
 140                                main_host_sbd->pio[0], position + 1);
 141     }
 142     return NULL;
 143 }
 144
 145 static void pxb_host_class_init(ObjectClass *class, void *data)
 146 {
 147     DeviceClass *dc = DEVICE_CLASS(class);
 148     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class);
 149     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class);
 150
 151     dc->fw_name = "pci";
 152     /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */
 153     dc->user_creatable = false;
 154     sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address;
 155     hc->root_bus_path = pxb_host_root_bus_path;
 156 }
 157
 158 static const TypeInfo pxb_host_info = {
 159     .name          = TYPE_PXB_HOST,
 160     .parent        = TYPE_PCI_HOST_BRIDGE,
 161     .class_init    = pxb_host_class_init,
 162 };
 163
 164 /*
 165  * Registers the PXB bus as a child of pci host root bus.
 166  */
 167 static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp)
 168 {
 169     PCIBus *bus = pci_get_bus(dev);
 170     int pxb_bus_num = pci_bus_num(pxb_bus);
 171
 172     if (bus->parent_dev) {
 173         error_setg(errp, "PXB devices can be attached only to root bus");
 174         return;
 175     }
 176
 177     QLIST_FOREACH(bus, &bus->child, sibling) {
 178         if (pci_bus_num(bus) == pxb_bus_num) {
 179             error_setg(errp, "Bus %d is already in use", pxb_bus_num);
 180             return;
 181         }
 182     }
 183     QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling);
 184 }
 185
 186 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
 187 {
 188     PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev;
 189
 190     /*
 191      * The bios does not index the pxb slot number when
 192      * it computes the IRQ because it resides on bus 0
 193      * and not on the current bus.
 194      * However QEMU routes the irq through bus 0 and adds
 195      * the pxb slot to the IRQ computation of the PXB
 196      * device.
 197      *
 198      * Synchronize between bios and QEMU by canceling
 199      * pxb's effect.
 200      */
 201     return pin - PCI_SLOT(pxb->devfn);
 202 }
 203
 204 static gint pxb_compare(gconstpointer a, gconstpointer b)
 205 {
 206     const PXBDev *pxb_a = a, *pxb_b = b;
 207
 208     return pxb_a->bus_nr < pxb_b->bus_nr ? -1 :
 209            pxb_a->bus_nr > pxb_b->bus_nr ?  1 :
 210            0;
 211 }
 212
 213 static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
 214 {
 215     PXBDev *pxb = convert_to_pxb(dev);
 216     DeviceState *ds, *bds = NULL;
 217     PCIBus *bus;
 218     const char *dev_name = NULL;
 219     Error *local_err = NULL;
 220
 221     if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
 222         pxb->numa_node >= nb_numa_nodes) {
 223         error_setg(errp, "Illegal numa node %d", pxb->numa_node);
 224         return;
 225     }
 226
 227     if (dev->qdev.id && *dev->qdev.id) {
 228         dev_name = dev->qdev.id;
 229     }
 230
 231     ds = qdev_create(NULL, TYPE_PXB_HOST);
 232     if (pcie) {
 233         bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS);
 234     } else {
 235         bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
 236         bds = qdev_create(BUS(bus), "pci-bridge");
 237         bds->id = dev_name;
 238         qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr);
 239         qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false);
 240     }
 241
 242     bus->parent_dev = dev;
 243     bus->address_space_mem = pci_get_bus(dev)->address_space_mem;
 244     bus->address_space_io = pci_get_bus(dev)->address_space_io;
 245     bus->map_irq = pxb_map_irq_fn;
 246
 247     PCI_HOST_BRIDGE(ds)->bus = bus;
 248
 249     pxb_register_bus(dev, bus, &local_err);
 250     if (local_err) {
 251         error_propagate(errp, local_err);
 252         goto err_register_bus;
 253     }
 254
 255     qdev_init_nofail(ds);
 256     if (bds) {
 257         qdev_init_nofail(bds);
 258     }
 259
 260     pci_word_test_and_set_mask(dev->config + PCI_STATUS,
 261                                PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
 262     pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);
 263
 264     pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare);
 265     return;
 266
 267 err_register_bus:
 268     object_unref(OBJECT(bds));
 269     object_unparent(OBJECT(bus));
 270     object_unref(OBJECT(ds));
 271 }
 272
 273 static void pxb_dev_realize(PCIDevice *dev, Error **errp)
 274 {
 275     if (pci_bus_is_express(pci_get_bus(dev))) {
 276         error_setg(errp, "pxb devices cannot reside on a PCIe bus");
 277         return;
 278     }
 279
 280     pxb_dev_realize_common(dev, false, errp);
 281 }
 282
 283 static void pxb_dev_exitfn(PCIDevice *pci_dev)
 284 {
 285     PXBDev *pxb = convert_to_pxb(pci_dev);
 286
 287     pxb_dev_list = g_list_remove(pxb_dev_list, pxb);
 288 }
 289
 290 static Property pxb_dev_properties[] = {
 291     /* Note: 0 is not a legal PXB bus number. */
 292     DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
 293     DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
 294     DEFINE_PROP_END_OF_LIST(),
 295 };
 296
 297 static void pxb_dev_class_init(ObjectClass *klass, void *data)
 298 {
 299     DeviceClass *dc = DEVICE_CLASS(klass);
 300     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 301
 302     k->realize = pxb_dev_realize;
 303     k->exit = pxb_dev_exitfn;
 304     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 305     k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
 306     k->class_id = PCI_CLASS_BRIDGE_HOST;
 307
 308     dc->desc = "PCI Expander Bridge";
 309     dc->props = pxb_dev_properties;
 310     dc->hotpluggable = false;
 311     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 312 }
 313
 314 static const TypeInfo pxb_dev_info = {
 315     .name          = TYPE_PXB_DEVICE,
 316     .parent        = TYPE_PCI_DEVICE,
 317     .instance_size = sizeof(PXBDev),
 318     .class_init    = pxb_dev_class_init,
 319     .interfaces = (InterfaceInfo[]) {
 320         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 321         { },
 322     },
 323 };
 324
 325 static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp)
 326 {
 327     if (!pci_bus_is_express(pci_get_bus(dev))) {
 328         error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus");
 329         return;
 330     }
 331
 332     pxb_dev_realize_common(dev, true, errp);
 333 }
 334
 335 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
 336 {
 337     DeviceClass *dc = DEVICE_CLASS(klass);
 338     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 339
 340     k->realize = pxb_pcie_dev_realize;
 341     k->exit = pxb_dev_exitfn;
 342     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 343     k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE;
 344     k->class_id = PCI_CLASS_BRIDGE_HOST;
 345
 346     dc->desc = "PCI Express Expander Bridge";
 347     dc->props = pxb_dev_properties;
 348     dc->hotpluggable = false;
 349     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 350 }
 351
 352 static const TypeInfo pxb_pcie_dev_info = {
 353     .name          = TYPE_PXB_PCIE_DEVICE,
 354     .parent        = TYPE_PCI_DEVICE,
 355     .instance_size = sizeof(PXBDev),
 356     .class_init    = pxb_pcie_dev_class_init,
 357     .interfaces = (InterfaceInfo[]) {
 358         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 359         { },
 360     },
 361 };
 362
 363 static void pxb_register_types(void)
 364 {
 365     type_register_static(&pxb_bus_info);
 366     type_register_static(&pxb_pcie_bus_info);
 367     type_register_static(&pxb_host_info);
 368     type_register_static(&pxb_dev_info);
 369     type_register_static(&pxb_pcie_dev_info);
 370 }
 371
 372 type_init(pxb_register_types)