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 "qemu/module.h"
  16 #include "hw/pci/msix.h"
  17 #include "hw/pci/pcie_port.h"
  18 #include "hw/qdev-properties.h"
  19 #include "hw/qdev-properties-system.h"
  20 #include "migration/vmstate.h"
  21 #include "qom/object.h"
  22
  23 #define TYPE_GEN_PCIE_ROOT_PORT                "pcie-root-port"
  24 OBJECT_DECLARE_SIMPLE_TYPE(GenPCIERootPort, GEN_PCIE_ROOT_PORT)
  25
  26 #define GEN_PCIE_ROOT_PORT_AER_OFFSET           0x100
  27 #define GEN_PCIE_ROOT_PORT_ACS_OFFSET \
  28         (GEN_PCIE_ROOT_PORT_AER_OFFSET + PCI_ERR_SIZEOF)
  29
  30 #define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR       1
  31 #define GEN_PCIE_ROOT_DEFAULT_IO_RANGE          4096
  32
  33 struct GenPCIERootPort {
  34     /*< private >*/
  35     PCIESlot parent_obj;
  36     /*< public >*/
  37
  38     bool migrate_msix;
  39
  40     /* additional resources to reserve */
  41     PCIResReserve res_reserve;
  42 };
  43
  44 static uint8_t gen_rp_aer_vector(const PCIDevice *d)
  45 {
  46     return 0;
  47 }
  48
  49 static int gen_rp_interrupts_init(PCIDevice *d, Error **errp)
  50 {
  51     int rc;
  52
  53     rc = msix_init_exclusive_bar(d, GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR, 0, errp);
  54
  55     if (rc < 0) {
  56         assert(rc == -ENOTSUP);
  57     } else {
  58         msix_vector_use(d, 0);
  59     }
  60
  61     return rc;
  62 }
  63
  64 static void gen_rp_interrupts_uninit(PCIDevice *d)
  65 {
  66     msix_uninit_exclusive_bar(d);
  67 }
  68
  69 static bool gen_rp_test_migrate_msix(void *opaque, int version_id)
  70 {
  71     GenPCIERootPort *rp = opaque;
  72
  73     return rp->migrate_msix;
  74 }
  75
  76 static void gen_rp_realize(DeviceState *dev, Error **errp)
  77 {
  78     PCIDevice *d = PCI_DEVICE(dev);
  79     PCIESlot *s = PCIE_SLOT(d);
  80     GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
  81     PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
  82     Error *local_err = NULL;
  83
  84     rpc->parent_realize(dev, &local_err);
  85     if (local_err) {
  86         error_propagate(errp, local_err);
  87         return;
  88     }
  89
  90     /*
  91      * reserving IO space led to worse issues in 6.1, when this hunk was
  92      * introduced. (see commit: 211afe5c69b59). Keep this broken for 6.1
  93      * machine type ABI compatibility only
  94      */
  95     if (s->hide_native_hotplug_cap && grp->res_reserve.io == -1 && s->hotplug) {
  96         grp->res_reserve.io = GEN_PCIE_ROOT_DEFAULT_IO_RANGE;
  97     }
  98     int rc = pci_bridge_qemu_reserve_cap_init(d, 0,
  99                                               grp->res_reserve, errp);
 100
 101     if (rc < 0) {
 102         rpc->parent_class.exit(d);
 103         return;
 104     }
 105
 106     if (!grp->res_reserve.io) {
 107         pci_word_test_and_clear_mask(d->wmask + PCI_COMMAND,
 108                                      PCI_COMMAND_IO);
 109         d->wmask[PCI_IO_BASE] = 0;
 110         d->wmask[PCI_IO_LIMIT] = 0;
 111     }
 112 }
 113
 114 static const VMStateDescription vmstate_rp_dev = {
 115     .name = "pcie-root-port",
 116     .priority = MIG_PRI_PCI_BUS,
 117     .version_id = 1,
 118     .minimum_version_id = 1,
 119     .post_load = pcie_cap_slot_post_load,
 120     .fields = (const VMStateField[]) {
 121         VMSTATE_PCI_DEVICE(parent_obj.parent_obj.parent_obj, PCIESlot),
 122         VMSTATE_STRUCT(parent_obj.parent_obj.parent_obj.exp.aer_log,
 123                        PCIESlot, 0, vmstate_pcie_aer_log, PCIEAERLog),
 124         VMSTATE_MSIX_TEST(parent_obj.parent_obj.parent_obj.parent_obj,
 125                           GenPCIERootPort,
 126                           gen_rp_test_migrate_msix),
 127         VMSTATE_END_OF_LIST()
 128     }
 129 };
 130
 131 static Property gen_rp_props[] = {
 132     DEFINE_PROP_BOOL("x-migrate-msix", GenPCIERootPort,
 133                      migrate_msix, true),
 134     DEFINE_PROP_UINT32("bus-reserve", GenPCIERootPort,
 135                        res_reserve.bus, -1),
 136     DEFINE_PROP_SIZE("io-reserve", GenPCIERootPort,
 137                      res_reserve.io, -1),
 138     DEFINE_PROP_SIZE("mem-reserve", GenPCIERootPort,
 139                      res_reserve.mem_non_pref, -1),
 140     DEFINE_PROP_SIZE("pref32-reserve", GenPCIERootPort,
 141                      res_reserve.mem_pref_32, -1),
 142     DEFINE_PROP_SIZE("pref64-reserve", GenPCIERootPort,
 143                      res_reserve.mem_pref_64, -1),
 144     DEFINE_PROP_PCIE_LINK_SPEED("x-speed", PCIESlot,
 145                                 speed, PCIE_LINK_SPEED_16),
 146     DEFINE_PROP_PCIE_LINK_WIDTH("x-width", PCIESlot,
 147                                 width, PCIE_LINK_WIDTH_32),
 148     DEFINE_PROP_END_OF_LIST()
 149 };
 150
 151 static void gen_rp_dev_class_init(ObjectClass *klass, void *data)
 152 {
 153     DeviceClass *dc = DEVICE_CLASS(klass);
 154     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 155     PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(klass);
 156
 157     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 158     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_RP;
 159     dc->desc = "PCI Express Root Port";
 160     dc->vmsd = &vmstate_rp_dev;
 161     device_class_set_props(dc, gen_rp_props);
 162
 163     device_class_set_parent_realize(dc, gen_rp_realize, &rpc->parent_realize);
 164
 165     rpc->aer_vector = gen_rp_aer_vector;
 166     rpc->interrupts_init = gen_rp_interrupts_init;
 167     rpc->interrupts_uninit = gen_rp_interrupts_uninit;
 168     rpc->aer_offset = GEN_PCIE_ROOT_PORT_AER_OFFSET;
 169     rpc->acs_offset = GEN_PCIE_ROOT_PORT_ACS_OFFSET;
 170 }
 171
 172 static const TypeInfo gen_rp_dev_info = {
 173     .name          = TYPE_GEN_PCIE_ROOT_PORT,
 174     .parent        = TYPE_PCIE_ROOT_PORT,
 175     .instance_size = sizeof(GenPCIERootPort),
 176     .class_init    = gen_rp_dev_class_init,
 177 };
 178
 179  static void gen_rp_register_types(void)
 180  {
 181     type_register_static(&gen_rp_dev_info);
 182  }
 183  type_init(gen_rp_register_types)