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 "hw/pci/pci.h"
  15 #include "hw/pci/pci_bus.h"
  16 #include "hw/pci/pci_host.h"
  17 #include "hw/pci/pci_bus.h"
  18 #include "hw/pci/pci_bridge.h"
  19 #include "hw/i386/pc.h"
  20 #include "qemu/range.h"
  21 #include "qemu/error-report.h"
  22 #include "sysemu/numa.h"
  23
  24 #define TYPE_PXB_BUS "pxb-bus"
  25 #define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS)
  26
  27 #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus"
  28 #define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS)
  29
  30 typedef struct PXBBus {
  31     /*< private >*/
  32     PCIBus parent_obj;
  33     /*< public >*/
  34
  35     char bus_path[8];
  36 } PXBBus;
  37
  38 #define TYPE_PXB_DEVICE "pxb"
  39 #define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE)
  40
  41 #define TYPE_PXB_PCIE_DEVICE "pxb-pcie"
  42 #define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE)
  43
  44 typedef struct PXBDev {
  45     /*< private >*/
  46     PCIDevice parent_obj;
  47     /*< public >*/
  48
  49     uint8_t bus_nr;
  50     uint16_t numa_node;
  51 } PXBDev;
  52
  53 static PXBDev *convert_to_pxb(PCIDevice *dev)
  54 {
  55     return pci_bus_is_express(dev->bus) ? 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->cannot_instantiate_with_device_add_yet = true;
 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 the i440fx root bus.
 166  *
 167  * Returns 0 on successs, -1 if i440fx host was not
 168  * found or the bus number is already in use.
 169  */
 170 static int pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus)
 171 {
 172     PCIBus *bus = dev->bus;
 173     int pxb_bus_num = pci_bus_num(pxb_bus);
 174
 175     if (bus->parent_dev) {
 176         error_report("PXB devices can be attached only to root bus.");
 177         return -1;
 178     }
 179
 180     QLIST_FOREACH(bus, &bus->child, sibling) {
 181         if (pci_bus_num(bus) == pxb_bus_num) {
 182             error_report("Bus %d is already in use.", pxb_bus_num);
 183             return -1;
 184         }
 185     }
 186     QLIST_INSERT_HEAD(&dev->bus->child, pxb_bus, sibling);
 187
 188     return 0;
 189 }
 190
 191 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
 192 {
 193     PCIDevice *pxb = pci_dev->bus->parent_dev;
 194
 195     /*
 196      * The bios does not index the pxb slot number when
 197      * it computes the IRQ because it resides on bus 0
 198      * and not on the current bus.
 199      * However QEMU routes the irq through bus 0 and adds
 200      * the pxb slot to the IRQ computation of the PXB
 201      * device.
 202      *
 203      * Synchronize between bios and QEMU by canceling
 204      * pxb's effect.
 205      */
 206     return pin - PCI_SLOT(pxb->devfn);
 207 }
 208
 209 static gint pxb_compare(gconstpointer a, gconstpointer b)
 210 {
 211     const PXBDev *pxb_a = a, *pxb_b = b;
 212
 213     return pxb_a->bus_nr < pxb_b->bus_nr ? -1 :
 214            pxb_a->bus_nr > pxb_b->bus_nr ?  1 :
 215            0;
 216 }
 217
 218 static int pxb_dev_init_common(PCIDevice *dev, bool pcie)
 219 {
 220     PXBDev *pxb = convert_to_pxb(dev);
 221     DeviceState *ds, *bds = NULL;
 222     PCIBus *bus;
 223     const char *dev_name = NULL;
 224
 225     if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
 226         pxb->numa_node >= nb_numa_nodes) {
 227         error_report("Illegal numa node %d.", pxb->numa_node);
 228         return -EINVAL;
 229     }
 230
 231     if (dev->qdev.id && *dev->qdev.id) {
 232         dev_name = dev->qdev.id;
 233     }
 234
 235     ds = qdev_create(NULL, TYPE_PXB_HOST);
 236     if (pcie) {
 237         bus = pci_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS);
 238     } else {
 239         bus = pci_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
 240         bds = qdev_create(BUS(bus), "pci-bridge");
 241         bds->id = dev_name;
 242         qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr);
 243         qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false);
 244     }
 245
 246     bus->parent_dev = dev;
 247     bus->address_space_mem = dev->bus->address_space_mem;
 248     bus->address_space_io = dev->bus->address_space_io;
 249     bus->map_irq = pxb_map_irq_fn;
 250
 251     PCI_HOST_BRIDGE(ds)->bus = bus;
 252
 253     if (pxb_register_bus(dev, bus)) {
 254         goto err_register_bus;
 255     }
 256
 257     qdev_init_nofail(ds);
 258     if (bds) {
 259         qdev_init_nofail(bds);
 260     }
 261
 262     pci_word_test_and_set_mask(dev->config + PCI_STATUS,
 263                                PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
 264     pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);
 265
 266     pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare);
 267     return 0;
 268
 269 err_register_bus:
 270     object_unref(OBJECT(bds));
 271     object_unparent(OBJECT(bus));
 272     object_unref(OBJECT(ds));
 273     return -EINVAL;
 274 }
 275
 276 static int pxb_dev_initfn(PCIDevice *dev)
 277 {
 278     if (pci_bus_is_express(dev->bus)) {
 279         error_report("pxb devices cannot reside on a PCIe bus!");
 280         return -EINVAL;
 281     }
 282
 283     return pxb_dev_init_common(dev, false);
 284 }
 285
 286 static void pxb_dev_exitfn(PCIDevice *pci_dev)
 287 {
 288     PXBDev *pxb = convert_to_pxb(pci_dev);
 289
 290     pxb_dev_list = g_list_remove(pxb_dev_list, pxb);
 291 }
 292
 293 static Property pxb_dev_properties[] = {
 294     /* Note: 0 is not a legal PXB bus number. */
 295     DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
 296     DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
 297     DEFINE_PROP_END_OF_LIST(),
 298 };
 299
 300 static void pxb_dev_class_init(ObjectClass *klass, void *data)
 301 {
 302     DeviceClass *dc = DEVICE_CLASS(klass);
 303     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 304
 305     k->init = pxb_dev_initfn;
 306     k->exit = pxb_dev_exitfn;
 307     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 308     k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
 309     k->class_id = PCI_CLASS_BRIDGE_HOST;
 310
 311     dc->desc = "PCI Expander Bridge";
 312     dc->props = pxb_dev_properties;
 313     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 314 }
 315
 316 static const TypeInfo pxb_dev_info = {
 317     .name          = TYPE_PXB_DEVICE,
 318     .parent        = TYPE_PCI_DEVICE,
 319     .instance_size = sizeof(PXBDev),
 320     .class_init    = pxb_dev_class_init,
 321 };
 322
 323 static int pxb_pcie_dev_initfn(PCIDevice *dev)
 324 {
 325     if (!pci_bus_is_express(dev->bus)) {
 326         error_report("pxb-pcie devices cannot reside on a PCI bus!");
 327         return -EINVAL;
 328     }
 329
 330     return pxb_dev_init_common(dev, true);
 331 }
 332
 333 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
 334 {
 335     DeviceClass *dc = DEVICE_CLASS(klass);
 336     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 337
 338     k->init = pxb_pcie_dev_initfn;
 339     k->exit = pxb_dev_exitfn;
 340     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 341     k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE;
 342     k->class_id = PCI_CLASS_BRIDGE_HOST;
 343
 344     dc->desc = "PCI Express Expander Bridge";
 345     dc->props = pxb_dev_properties;
 346     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 347 }
 348
 349 static const TypeInfo pxb_pcie_dev_info = {
 350     .name          = TYPE_PXB_PCIE_DEVICE,
 351     .parent        = TYPE_PCI_DEVICE,
 352     .instance_size = sizeof(PXBDev),
 353     .class_init    = pxb_pcie_dev_class_init,
 354 };
 355
 356 static void pxb_register_types(void)
 357 {
 358     type_register_static(&pxb_bus_info);
 359     type_register_static(&pxb_pcie_bus_info);
 360     type_register_static(&pxb_host_info);
 361     type_register_static(&pxb_dev_info);
 362     type_register_static(&pxb_pcie_dev_info);
 363 }
 364
 365 type_init(pxb_register_types)