hw/pci_bridge_dev.c

   1 /*
   2  * Standard PCI Bridge Device
   3  *
   4  * Copyright (c) 2011 Red Hat Inc. Author: Michael S. Tsirkin <mst@redhat.com>
   5  *
   6  * http://www.pcisig.com/specifications/conventional/pci_to_pci_bridge_architecture/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "pci_bridge.h"
  23 #include "pci_ids.h"
  24 #include "msi.h"
  25 #include "shpc.h"
  26 #include "slotid_cap.h"
  27 #include "memory.h"
  28 #include "pci_internals.h"
  29
  30 #define REDHAT_PCI_VENDOR_ID 0x1b36
  31 #define PCI_BRIDGE_DEV_VENDOR_ID REDHAT_PCI_VENDOR_ID
  32 #define PCI_BRIDGE_DEV_DEVICE_ID 0x1
  33
  34 struct PCIBridgeDev {
  35     PCIBridge bridge;
  36     MemoryRegion bar;
  37     uint8_t chassis_nr;
  38 #define PCI_BRIDGE_DEV_F_MSI_REQ 0
  39     uint32_t flags;
  40 };
  41 typedef struct PCIBridgeDev PCIBridgeDev;
  42
  43 /* Mapping mandated by PCI-to-PCI Bridge architecture specification,
  44  * revision 1.2 */
  45 /* Table 9-1: Interrupt Binding for Devices Behind a Bridge */
  46 static int pci_bridge_dev_map_irq_fn(PCIDevice *dev, int irq_num)
  47 {
  48     return (irq_num + PCI_SLOT(dev->devfn)) % PCI_NUM_PINS;
  49 }
  50
  51 static int pci_bridge_dev_initfn(PCIDevice *dev)
  52 {
  53     PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
  54     PCIBridgeDev *bridge_dev = DO_UPCAST(PCIBridgeDev, bridge, br);
  55     int err;
  56     pci_bridge_map_irq(br, NULL, pci_bridge_dev_map_irq_fn);
  57     err = pci_bridge_initfn(dev);
  58     if (err) {
  59         goto bridge_error;
  60     }
  61     memory_region_init(&bridge_dev->bar, "shpc-bar", shpc_bar_size(dev));
  62     err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0);
  63     if (err) {
  64         goto shpc_error;
  65     }
  66     err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0);
  67     if (err) {
  68         goto slotid_error;
  69     }
  70     if ((bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_MSI_REQ)) &&
  71         msi_supported) {
  72         err = msi_init(dev, 0, 1, true, true);
  73         if (err < 0) {
  74             goto msi_error;
  75         }
  76     }
  77     /* TODO: spec recommends using 64 bit prefetcheable BAR.
  78      * Check whether that works well. */
  79     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
  80                      PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar);
  81     dev->config[PCI_INTERRUPT_PIN] = 0x1;
  82     return 0;
  83 msi_error:
  84     slotid_cap_cleanup(dev);
  85 slotid_error:
  86     shpc_cleanup(dev, &bridge_dev->bar);
  87 shpc_error:
  88     memory_region_destroy(&bridge_dev->bar);
  89 bridge_error:
  90     return err;
  91 }
  92
  93 static int pci_bridge_dev_exitfn(PCIDevice *dev)
  94 {
  95     PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
  96     PCIBridgeDev *bridge_dev = DO_UPCAST(PCIBridgeDev, bridge, br);
  97     int ret;
  98     if (msi_present(dev)) {
  99         msi_uninit(dev);
 100     }
 101     slotid_cap_cleanup(dev);
 102     shpc_cleanup(dev, &bridge_dev->bar);
 103     memory_region_destroy(&bridge_dev->bar);
 104     ret = pci_bridge_exitfn(dev);
 105     assert(!ret);
 106     return 0;
 107 }
 108
 109 static void pci_bridge_dev_write_config(PCIDevice *d,
 110                                         uint32_t address, uint32_t val, int len)
 111 {
 112     pci_bridge_write_config(d, address, val, len);
 113     if (msi_present(d)) {
 114         msi_write_config(d, address, val, len);
 115     }
 116     shpc_cap_write_config(d, address, val, len);
 117 }
 118
 119 static void qdev_pci_bridge_dev_reset(DeviceState *qdev)
 120 {
 121     PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
 122
 123     pci_bridge_reset(qdev);
 124     shpc_reset(dev);
 125 }
 126
 127 static Property pci_bridge_dev_properties[] = {
 128                     /* Note: 0 is not a legal chassis number. */
 129     DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0),
 130     DEFINE_PROP_BIT("msi", PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_MSI_REQ, true),
 131     DEFINE_PROP_END_OF_LIST(),
 132 };
 133
 134 static const VMStateDescription pci_bridge_dev_vmstate = {
 135     .name = "pci_bridge",
 136     .fields = (VMStateField[]) {
 137         VMSTATE_PCI_DEVICE(bridge.dev, PCIBridgeDev),
 138         SHPC_VMSTATE(bridge.dev.shpc, PCIBridgeDev),
 139         VMSTATE_END_OF_LIST()
 140     }
 141 };
 142
 143 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data)
 144 {
 145     DeviceClass *dc = DEVICE_CLASS(klass);
 146     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 147     k->init = pci_bridge_dev_initfn;
 148     k->exit = pci_bridge_dev_exitfn;
 149     k->config_write = pci_bridge_dev_write_config;
 150     k->vendor_id = PCI_BRIDGE_DEV_VENDOR_ID;
 151     k->device_id = PCI_BRIDGE_DEV_DEVICE_ID;
 152     k->class_id = PCI_CLASS_BRIDGE_PCI;
 153     k->is_bridge = 1,
 154     dc->desc = "Standard PCI Bridge";
 155     dc->reset = qdev_pci_bridge_dev_reset;
 156     dc->props = pci_bridge_dev_properties;
 157     dc->vmsd = &pci_bridge_dev_vmstate;
 158 }
 159
 160 static TypeInfo pci_bridge_dev_info = {
 161     .name = "pci-bridge",
 162     .parent        = TYPE_PCI_DEVICE,
 163     .instance_size = sizeof(PCIBridgeDev),
 164     .class_init = pci_bridge_dev_class_init,
 165 };
 166
 167 static void pci_bridge_dev_register(void)
 168 {
 169     type_register_static(&pci_bridge_dev_info);
 170 }
 171
 172 type_init(pci_bridge_dev_register);