hw/pci-bridge/gen_pcie_root_port.c

   1 /*
   2  * Generic PCI Express Root Port emulation
   3  *
   4  * Copyright (C) 2017 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/msix.h"
  16 #include "hw/pci/pcie_port.h"
  17
  18 #define TYPE_GEN_PCIE_ROOT_PORT                "pcie-root-port"
  19 #define GEN_PCIE_ROOT_PORT(obj) \
  20         OBJECT_CHECK(GenPCIERootPort, (obj), TYPE_GEN_PCIE_ROOT_PORT)
  21
  22 #define GEN_PCIE_ROOT_PORT_AER_OFFSET           0x100
  23 #define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR       1
  24
  25 typedef struct GenPCIERootPort {
  26     /*< private >*/
  27     PCIESlot parent_obj;
  28     /*< public >*/
  29
  30     bool migrate_msix;
  31
  32     /* additional resources to reserve on firmware init */
  33     uint32_t bus_reserve;
  34     uint64_t io_reserve;
  35     uint64_t mem_reserve;
  36     uint64_t pref32_reserve;
  37     uint64_t pref64_reserve;
  38 } GenPCIERootPort;
  39
  40 static uint8_t gen_rp_aer_vector(const PCIDevice *d)
  41 {
  42     return 0;
  43 }
  44
  45 static int gen_rp_interrupts_init(PCIDevice *d, Error **errp)
  46 {
  47     int rc;
  48
  49     rc = msix_init_exclusive_bar(d, GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR, 0, errp);
  50
  51     if (rc < 0) {
  52         assert(rc == -ENOTSUP);
  53     } else {
  54         msix_vector_use(d, 0);
  55     }
  56
  57     return rc;
  58 }
  59
  60 static void gen_rp_interrupts_uninit(PCIDevice *d)
  61 {
  62     msix_uninit_exclusive_bar(d);
  63 }
  64
  65 static bool gen_rp_test_migrate_msix(void *opaque, int version_id)
  66 {
  67     GenPCIERootPort *rp = opaque;
  68
  69     return rp->migrate_msix;
  70 }
  71
  72 static void gen_rp_realize(DeviceState *dev, Error **errp)
  73 {
  74     PCIDevice *d = PCI_DEVICE(dev);
  75     GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
  76     PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
  77     Error *local_err = NULL;
  78
  79     rpc->parent_realize(dev, &local_err);
  80     if (local_err) {
  81         error_propagate(errp, local_err);
  82         return;
  83     }
  84
  85     int rc = pci_bridge_qemu_reserve_cap_init(d, 0, grp->bus_reserve,
  86             grp->io_reserve, grp->mem_reserve, grp->pref32_reserve,
  87             grp->pref64_reserve, errp);
  88
  89     if (rc < 0) {
  90         rpc->parent_class.exit(d);
  91         return;
  92     }
  93
  94     if (!grp->io_reserve) {
  95         pci_word_test_and_clear_mask(d->wmask + PCI_COMMAND,
  96                                      PCI_COMMAND_IO);
  97         d->wmask[PCI_IO_BASE] = 0;
  98         d->wmask[PCI_IO_LIMIT] = 0;
  99     }
 100 }
 101
 102 static const VMStateDescription vmstate_rp_dev = {
 103     .name = "pcie-root-port",
 104     .priority = MIG_PRI_PCI_BUS,
 105     .version_id = 1,
 106     .minimum_version_id = 1,
 107     .post_load = pcie_cap_slot_post_load,
 108     .fields = (VMStateField[]) {
 109         VMSTATE_PCI_DEVICE(parent_obj.parent_obj.parent_obj, PCIESlot),
 110         VMSTATE_STRUCT(parent_obj.parent_obj.parent_obj.exp.aer_log,
 111                        PCIESlot, 0, vmstate_pcie_aer_log, PCIEAERLog),
 112         VMSTATE_MSIX_TEST(parent_obj.parent_obj.parent_obj.parent_obj,
 113                           GenPCIERootPort,
 114                           gen_rp_test_migrate_msix),
 115         VMSTATE_END_OF_LIST()
 116     }
 117 };
 118
 119 static Property gen_rp_props[] = {
 120     DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort, migrate_msix, true),
 121     DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort, bus_reserve, -1),
 122     DEFINE_PROP_SIZE("io-reserve", GenPCIERootPort, io_reserve, -1),
 123     DEFINE_PROP_SIZE("mem-reserve", GenPCIERootPort, mem_reserve, -1),
 124     DEFINE_PROP_SIZE("pref32-reserve", GenPCIERootPort, pref32_reserve, -1),
 125     DEFINE_PROP_SIZE("pref64-reserve", GenPCIERootPort, pref64_reserve, -1),
 126     DEFINE_PROP_END_OF_LIST()
 127 };
 128
 129 static void gen_rp_dev_class_init(ObjectClass *klass, void *data)
 130 {
 131     DeviceClass *dc = DEVICE_CLASS(klass);
 132     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 133     PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(klass);
 134
 135     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 136     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_RP;
 137     dc->desc = "PCI Express Root Port";
 138     dc->vmsd = &vmstate_rp_dev;
 139     dc->props = gen_rp_props;
 140
 141     device_class_set_parent_realize(dc, gen_rp_realize, &rpc->parent_realize);
 142
 143     rpc->aer_vector = gen_rp_aer_vector;
 144     rpc->interrupts_init = gen_rp_interrupts_init;
 145     rpc->interrupts_uninit = gen_rp_interrupts_uninit;
 146     rpc->aer_offset = GEN_PCIE_ROOT_PORT_AER_OFFSET;
 147 }
 148
 149 static const TypeInfo gen_rp_dev_info = {
 150     .name          = TYPE_GEN_PCIE_ROOT_PORT,
 151     .parent        = TYPE_PCIE_ROOT_PORT,
 152     .instance_size = sizeof(GenPCIERootPort),
 153     .class_init    = gen_rp_dev_class_init,
 154 };
 155
 156  static void gen_rp_register_types(void)
 157  {
 158     type_register_static(&gen_rp_dev_info);
 159  }
 160  type_init(gen_rp_register_types)