hw/pci-bridge/pcie_pci_bridge.c

   1 /*
   2  * QEMU Generic PCIE-PCI Bridge
   3  *
   4  * Copyright (c) 2017 Aleksandr Bezzubikov
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "qapi/error.h"
  12 #include "qemu/module.h"
  13 #include "hw/pci/pci.h"
  14 #include "hw/pci/pci_bus.h"
  15 #include "hw/pci/pci_bridge.h"
  16 #include "hw/pci/msi.h"
  17 #include "hw/pci/shpc.h"
  18 #include "hw/pci/slotid_cap.h"
  19 #include "hw/qdev-properties.h"
  20
  21 typedef struct PCIEPCIBridge {
  22     /*< private >*/
  23     PCIBridge parent_obj;
  24
  25     OnOffAuto msi;
  26     MemoryRegion shpc_bar;
  27     /*< public >*/
  28 } PCIEPCIBridge;
  29
  30 #define TYPE_PCIE_PCI_BRIDGE_DEV "pcie-pci-bridge"
  31 #define PCIE_PCI_BRIDGE_DEV(obj) \
  32         OBJECT_CHECK(PCIEPCIBridge, (obj), TYPE_PCIE_PCI_BRIDGE_DEV)
  33
  34 static void pcie_pci_bridge_realize(PCIDevice *d, Error **errp)
  35 {
  36     PCIBridge *br = PCI_BRIDGE(d);
  37     PCIEPCIBridge *pcie_br = PCIE_PCI_BRIDGE_DEV(d);
  38     int rc, pos;
  39
  40     pci_bridge_initfn(d, TYPE_PCI_BUS);
  41
  42     d->config[PCI_INTERRUPT_PIN] = 0x1;
  43     memory_region_init(&pcie_br->shpc_bar, OBJECT(d), "shpc-bar",
  44                        shpc_bar_size(d));
  45     rc = shpc_init(d, &br->sec_bus, &pcie_br->shpc_bar, 0, errp);
  46     if (rc) {
  47         goto error;
  48     }
  49
  50     rc = pcie_cap_init(d, 0, PCI_EXP_TYPE_PCI_BRIDGE, 0, errp);
  51     if (rc < 0) {
  52         goto cap_error;
  53     }
  54
  55     pos = pci_add_capability(d, PCI_CAP_ID_PM, 0, PCI_PM_SIZEOF, errp);
  56     if (pos < 0) {
  57         goto pm_error;
  58     }
  59     d->exp.pm_cap = pos;
  60     pci_set_word(d->config + pos + PCI_PM_PMC, 0x3);
  61
  62     pcie_cap_arifwd_init(d);
  63     pcie_cap_deverr_init(d);
  64
  65     rc = pcie_aer_init(d, PCI_ERR_VER, 0x100, PCI_ERR_SIZEOF, errp);
  66     if (rc < 0) {
  67         goto aer_error;
  68     }
  69
  70     Error *local_err = NULL;
  71     if (pcie_br->msi != ON_OFF_AUTO_OFF) {
  72         rc = msi_init(d, 0, 1, true, true, &local_err);
  73         if (rc < 0) {
  74             assert(rc == -ENOTSUP);
  75             if (pcie_br->msi != ON_OFF_AUTO_ON) {
  76                 error_free(local_err);
  77             } else {
  78                 /* failed to satisfy user's explicit request for MSI */
  79                 error_propagate(errp, local_err);
  80                 goto msi_error;
  81             }
  82         }
  83     }
  84     pci_register_bar(d, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
  85                      PCI_BASE_ADDRESS_MEM_TYPE_64, &pcie_br->shpc_bar);
  86     return;
  87
  88 msi_error:
  89     pcie_aer_exit(d);
  90 aer_error:
  91 pm_error:
  92     pcie_cap_exit(d);
  93 cap_error:
  94     shpc_cleanup(d, &pcie_br->shpc_bar);
  95 error:
  96     pci_bridge_exitfn(d);
  97 }
  98
  99 static void pcie_pci_bridge_exit(PCIDevice *d)
 100 {
 101     PCIEPCIBridge *bridge_dev = PCIE_PCI_BRIDGE_DEV(d);
 102     pcie_cap_exit(d);
 103     shpc_cleanup(d, &bridge_dev->shpc_bar);
 104     pci_bridge_exitfn(d);
 105 }
 106
 107 static void pcie_pci_bridge_reset(DeviceState *qdev)
 108 {
 109     PCIDevice *d = PCI_DEVICE(qdev);
 110     pci_bridge_reset(qdev);
 111     if (msi_present(d)) {
 112         msi_reset(d);
 113     }
 114     shpc_reset(d);
 115 }
 116
 117 static void pcie_pci_bridge_write_config(PCIDevice *d,
 118         uint32_t address, uint32_t val, int len)
 119 {
 120     pci_bridge_write_config(d, address, val, len);
 121     if (msi_present(d)) {
 122         msi_write_config(d, address, val, len);
 123     }
 124     shpc_cap_write_config(d, address, val, len);
 125 }
 126
 127 static Property pcie_pci_bridge_dev_properties[] = {
 128         DEFINE_PROP_ON_OFF_AUTO("msi", PCIEPCIBridge, msi, ON_OFF_AUTO_AUTO),
 129         DEFINE_PROP_END_OF_LIST(),
 130 };
 131
 132 static const VMStateDescription pcie_pci_bridge_dev_vmstate = {
 133         .name = TYPE_PCIE_PCI_BRIDGE_DEV,
 134         .priority = MIG_PRI_PCI_BUS,
 135         .fields = (VMStateField[]) {
 136             VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),
 137             SHPC_VMSTATE(shpc, PCIDevice, NULL),
 138             VMSTATE_END_OF_LIST()
 139         }
 140 };
 141
 142 static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data)
 143 {
 144     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 145     DeviceClass *dc = DEVICE_CLASS(klass);
 146     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
 147
 148     k->is_bridge = true;
 149     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 150     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE;
 151     k->realize = pcie_pci_bridge_realize;
 152     k->exit = pcie_pci_bridge_exit;
 153     k->config_write = pcie_pci_bridge_write_config;
 154     dc->vmsd = &pcie_pci_bridge_dev_vmstate;
 155     device_class_set_props(dc, pcie_pci_bridge_dev_properties);
 156     dc->reset = &pcie_pci_bridge_reset;
 157     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 158     hc->plug = pci_bridge_dev_plug_cb;
 159     hc->unplug = pci_bridge_dev_unplug_cb;
 160     hc->unplug_request = pci_bridge_dev_unplug_request_cb;
 161 }
 162
 163 static const TypeInfo pcie_pci_bridge_info = {
 164         .name = TYPE_PCIE_PCI_BRIDGE_DEV,
 165         .parent = TYPE_PCI_BRIDGE,
 166         .instance_size = sizeof(PCIEPCIBridge),
 167         .class_init = pcie_pci_bridge_class_init,
 168         .interfaces = (InterfaceInfo[]) {
 169             { TYPE_HOTPLUG_HANDLER },
 170             { INTERFACE_PCIE_DEVICE },
 171             { },
 172         }
 173 };
 174
 175 static void pciepci_register(void)
 176 {
 177     type_register_static(&pcie_pci_bridge_info);
 178 }
 179
 180 type_init(pciepci_register);