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 */
  33     PCIResReserve res_reserve;
  34 } GenPCIERootPort;
  35
  36 static uint8_t gen_rp_aer_vector(const PCIDevice *d)
  37 {
  38     return 0;
  39 }
  40
  41 static int gen_rp_interrupts_init(PCIDevice *d, Error **errp)
  42 {
  43     int rc;
  44
  45     rc = msix_init_exclusive_bar(d, GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR, 0, errp);
  46
  47     if (rc < 0) {
  48         assert(rc == -ENOTSUP);
  49     } else {
  50         msix_vector_use(d, 0);
  51     }
  52
  53     return rc;
  54 }
  55
  56 static void gen_rp_interrupts_uninit(PCIDevice *d)
  57 {
  58     msix_uninit_exclusive_bar(d);
  59 }
  60
  61 static bool gen_rp_test_migrate_msix(void *opaque, int version_id)
  62 {
  63     GenPCIERootPort *rp = opaque;
  64
  65     return rp->migrate_msix;
  66 }
  67
  68 static void gen_rp_realize(DeviceState *dev, Error **errp)
  69 {
  70     PCIDevice *d = PCI_DEVICE(dev);
  71     GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
  72     PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
  73     Error *local_err = NULL;
  74
  75     rpc->parent_realize(dev, &local_err);
  76     if (local_err) {
  77         error_propagate(errp, local_err);
  78         return;
  79     }
  80
  81     int rc = pci_bridge_qemu_reserve_cap_init(d, 0,
  82                                               grp->res_reserve, errp);
  83
  84     if (rc < 0) {
  85         rpc->parent_class.exit(d);
  86         return;
  87     }
  88
  89     if (!grp->res_reserve.io) {
  90         pci_word_test_and_clear_mask(d->wmask + PCI_COMMAND,
  91                                      PCI_COMMAND_IO);
  92         d->wmask[PCI_IO_BASE] = 0;
  93         d->wmask[PCI_IO_LIMIT] = 0;
  94     }
  95 }
  96
  97 static const VMStateDescription vmstate_rp_dev = {
  98     .name = "pcie-root-port",
  99     .priority = MIG_PRI_PCI_BUS,
 100     .version_id = 1,
 101     .minimum_version_id = 1,
 102     .post_load = pcie_cap_slot_post_load,
 103     .fields = (VMStateField[]) {
 104         VMSTATE_PCI_DEVICE(parent_obj.parent_obj.parent_obj, PCIESlot),
 105         VMSTATE_STRUCT(parent_obj.parent_obj.parent_obj.exp.aer_log,
 106                        PCIESlot, 0, vmstate_pcie_aer_log, PCIEAERLog),
 107         VMSTATE_MSIX_TEST(parent_obj.parent_obj.parent_obj.parent_obj,
 108                           GenPCIERootPort,
 109                           gen_rp_test_migrate_msix),
 110         VMSTATE_END_OF_LIST()
 111     }
 112 };
 113
 114 static Property gen_rp_props[] = {
 115     DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort,
 116                      migrate_msix, true),
 117     DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort,
 118                        res_reserve.bus, -1),
 119     DEFINE_PROP_SIZE("io-reserve", GenPCIERootPort,
 120                      res_reserve.io, -1),
 121     DEFINE_PROP_SIZE("mem-reserve", GenPCIERootPort,
 122                      res_reserve.mem_non_pref, -1),
 123     DEFINE_PROP_SIZE("pref32-reserve", GenPCIERootPort,
 124                      res_reserve.mem_pref_32, -1),
 125     DEFINE_PROP_SIZE("pref64-reserve", GenPCIERootPort,
 126                      res_reserve.mem_pref_64, -1),
 127     DEFINE_PROP_END_OF_LIST()
 128 };
 129
 130 static void gen_rp_dev_class_init(ObjectClass *klass, void *data)
 131 {
 132     DeviceClass *dc = DEVICE_CLASS(klass);
 133     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 134     PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(klass);
 135
 136     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 137     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_RP;
 138     dc->desc = "PCI Express Root Port";
 139     dc->vmsd = &vmstate_rp_dev;
 140     dc->props = gen_rp_props;
 141
 142     device_class_set_parent_realize(dc, gen_rp_realize, &rpc->parent_realize);
 143
 144     rpc->aer_vector = gen_rp_aer_vector;
 145     rpc->interrupts_init = gen_rp_interrupts_init;
 146     rpc->interrupts_uninit = gen_rp_interrupts_uninit;
 147     rpc->aer_offset = GEN_PCIE_ROOT_PORT_AER_OFFSET;
 148 }
 149
 150 static const TypeInfo gen_rp_dev_info = {
 151     .name          = TYPE_GEN_PCIE_ROOT_PORT,
 152     .parent        = TYPE_PCIE_ROOT_PORT,
 153     .instance_size = sizeof(GenPCIERootPort),
 154     .class_init    = gen_rp_dev_class_init,
 155 };
 156
 157  static void gen_rp_register_types(void)
 158  {
 159     type_register_static(&gen_rp_dev_info);
 160  }
 161  type_init(gen_rp_register_types)