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
  57     pci_bridge_map_irq(br, NULL, pci_bridge_dev_map_irq_fn);
  58     err = pci_bridge_initfn(dev);
  59     if (err) {
  60         goto bridge_error;
  61     }
  62     memory_region_init(&bridge_dev->bar, "shpc-bar", shpc_bar_size(dev));
  63     err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0);
  64     if (err) {
  65         goto shpc_error;
  66     }
  67     err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0);
  68     if (err) {
  69         goto slotid_error;
  70     }
  71     if ((bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_MSI_REQ)) &&
  72         msi_supported) {
  73         err = msi_init(dev, 0, 1, true, true);
  74         if (err < 0) {
  75             goto msi_error;
  76         }
  77     }
  78     /* TODO: spec recommends using 64 bit prefetcheable BAR.
  79      * Check whether that works well. */
  80     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
  81                      PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar);
  82     dev->config[PCI_INTERRUPT_PIN] = 0x1;
  83     return 0;
  84 msi_error:
  85     slotid_cap_cleanup(dev);
  86 slotid_error:
  87     shpc_cleanup(dev, &bridge_dev->bar);
  88 shpc_error:
  89     memory_region_destroy(&bridge_dev->bar);
  90     pci_bridge_exitfn(dev);
  91 bridge_error:
  92     return err;
  93 }
  94
  95 static void pci_bridge_dev_exitfn(PCIDevice *dev)
  96 {
  97     PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
  98     PCIBridgeDev *bridge_dev = DO_UPCAST(PCIBridgeDev, bridge, br);
  99     if (msi_present(dev)) {
 100         msi_uninit(dev);
 101     }
 102     slotid_cap_cleanup(dev);
 103     shpc_cleanup(dev, &bridge_dev->bar);
 104     memory_region_destroy(&bridge_dev->bar);
 105     pci_bridge_exitfn(dev);
 106 }
 107
 108 static void pci_bridge_dev_write_config(PCIDevice *d,
 109                                         uint32_t address, uint32_t val, int len)
 110 {
 111     pci_bridge_write_config(d, address, val, len);
 112     if (msi_present(d)) {
 113         msi_write_config(d, address, val, len);
 114     }
 115     shpc_cap_write_config(d, address, val, len);
 116 }
 117
 118 static void qdev_pci_bridge_dev_reset(DeviceState *qdev)
 119 {
 120     PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
 121
 122     pci_bridge_reset(qdev);
 123     shpc_reset(dev);
 124 }
 125
 126 static Property pci_bridge_dev_properties[] = {
 127                     /* Note: 0 is not a legal chassis number. */
 128     DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0),
 129     DEFINE_PROP_BIT("msi", PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_MSI_REQ, true),
 130     DEFINE_PROP_END_OF_LIST(),
 131 };
 132
 133 static const VMStateDescription pci_bridge_dev_vmstate = {
 134     .name = "pci_bridge",
 135     .fields = (VMStateField[]) {
 136         VMSTATE_PCI_DEVICE(bridge.dev, PCIBridgeDev),
 137         SHPC_VMSTATE(bridge.dev.shpc, PCIBridgeDev),
 138         VMSTATE_END_OF_LIST()
 139     }
 140 };
 141
 142 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data)
 143 {
 144     DeviceClass *dc = DEVICE_CLASS(klass);
 145     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 146     k->init = pci_bridge_dev_initfn;
 147     k->exit = pci_bridge_dev_exitfn;
 148     k->config_write = pci_bridge_dev_write_config;
 149     k->vendor_id = PCI_BRIDGE_DEV_VENDOR_ID;
 150     k->device_id = PCI_BRIDGE_DEV_DEVICE_ID;
 151     k->class_id = PCI_CLASS_BRIDGE_PCI;
 152     k->is_bridge = 1,
 153     dc->desc = "Standard PCI Bridge";
 154     dc->reset = qdev_pci_bridge_dev_reset;
 155     dc->props = pci_bridge_dev_properties;
 156     dc->vmsd = &pci_bridge_dev_vmstate;
 157 }
 158
 159 static TypeInfo pci_bridge_dev_info = {
 160     .name = "pci-bridge",
 161     .parent        = TYPE_PCI_DEVICE,
 162     .instance_size = sizeof(PCIBridgeDev),
 163     .class_init = pci_bridge_dev_class_init,
 164 };
 165
 166 static void pci_bridge_dev_register(void)
 167 {
 168     type_register_static(&pci_bridge_dev_info);
 169 }
 170
 171 type_init(pci_bridge_dev_register);