qemu

pci_expander_bridge.c (15971B)

---

 /*
  * PCI Expander Bridge Device Emulation
  *
  * Copyright (C) 2015 Red Hat Inc
  *
  * Authors:
  *   Marcel Apfelbaum <marcel@redhat.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "hw/pci/pci.h"
 #include "hw/pci/pci_bus.h"
 #include "hw/pci/pci_host.h"
 #include "hw/qdev-properties.h"
 #include "hw/pci/pci_bridge.h"
 #include "hw/pci-bridge/pci_expander_bridge.h"
 #include "hw/cxl/cxl.h"
 #include "qemu/range.h"
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "sysemu/numa.h"
 #include "hw/boards.h"
 #include "qom/object.h"
 
 enum BusType { PCI, PCIE, CXL };
 
 #define TYPE_PXB_BUS "pxb-bus"
 typedef struct PXBBus PXBBus;
 DECLARE_INSTANCE_CHECKER(PXBBus, PXB_BUS,
                          TYPE_PXB_BUS)
 
 #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus"
 DECLARE_INSTANCE_CHECKER(PXBBus, PXB_PCIE_BUS,
                          TYPE_PXB_PCIE_BUS)
 
 #define TYPE_PXB_CXL_BUS "pxb-cxl-bus"
 DECLARE_INSTANCE_CHECKER(PXBBus, PXB_CXL_BUS,
                          TYPE_PXB_CXL_BUS)
 
 struct PXBBus {
     /*< private >*/
     PCIBus parent_obj;
     /*< public >*/
 
     char bus_path[8];
 };
 
 #define TYPE_PXB_DEVICE "pxb"
 typedef struct PXBDev PXBDev;
 DECLARE_INSTANCE_CHECKER(PXBDev, PXB_DEV,
                          TYPE_PXB_DEVICE)
 
 #define TYPE_PXB_PCIE_DEVICE "pxb-pcie"
 DECLARE_INSTANCE_CHECKER(PXBDev, PXB_PCIE_DEV,
                          TYPE_PXB_PCIE_DEVICE)
 
 static PXBDev *convert_to_pxb(PCIDevice *dev)
 {
     /* A CXL PXB's parent bus is PCIe, so the normal check won't work */
     if (object_dynamic_cast(OBJECT(dev), TYPE_PXB_CXL_DEVICE)) {
         return PXB_CXL_DEV(dev);
     }
 
     return pci_bus_is_express(pci_get_bus(dev))
         ? PXB_PCIE_DEV(dev) : PXB_DEV(dev);
 }
 
 static GList *pxb_dev_list;
 
 #define TYPE_PXB_HOST "pxb-host"
 
 CXLComponentState *cxl_get_hb_cstate(PCIHostState *hb)
 {
     CXLHost *host = PXB_CXL_HOST(hb);
 
     return &host->cxl_cstate;
 }
 
 static int pxb_bus_num(PCIBus *bus)
 {
     PXBDev *pxb = convert_to_pxb(bus->parent_dev);
 
     return pxb->bus_nr;
 }
 
 static uint16_t pxb_bus_numa_node(PCIBus *bus)
 {
     PXBDev *pxb = convert_to_pxb(bus->parent_dev);
 
     return pxb->numa_node;
 }
 
 static void pxb_bus_class_init(ObjectClass *class, void *data)
 {
     PCIBusClass *pbc = PCI_BUS_CLASS(class);
 
     pbc->bus_num = pxb_bus_num;
     pbc->numa_node = pxb_bus_numa_node;
 }
 
 static const TypeInfo pxb_bus_info = {
     .name          = TYPE_PXB_BUS,
     .parent        = TYPE_PCI_BUS,
     .instance_size = sizeof(PXBBus),
     .class_init    = pxb_bus_class_init,
 };
 
 static const TypeInfo pxb_pcie_bus_info = {
     .name          = TYPE_PXB_PCIE_BUS,
     .parent        = TYPE_PCIE_BUS,
     .instance_size = sizeof(PXBBus),
     .class_init    = pxb_bus_class_init,
 };
 
 static const TypeInfo pxb_cxl_bus_info = {
     .name          = TYPE_PXB_CXL_BUS,
     .parent        = TYPE_CXL_BUS,
     .instance_size = sizeof(PXBBus),
     .class_init    = pxb_bus_class_init,
 };
 
 static const char *pxb_host_root_bus_path(PCIHostState *host_bridge,
                                           PCIBus *rootbus)
 {
     PXBBus *bus = pci_bus_is_cxl(rootbus) ?
                       PXB_CXL_BUS(rootbus) :
                       pci_bus_is_express(rootbus) ? PXB_PCIE_BUS(rootbus) :
                                                     PXB_BUS(rootbus);
 
     snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus));
     return bus->bus_path;
 }
 
 static char *pxb_host_ofw_unit_address(const SysBusDevice *dev)
 {
     const PCIHostState *pxb_host;
     const PCIBus *pxb_bus;
     const PXBDev *pxb_dev;
     int position;
     const DeviceState *pxb_dev_base;
     const PCIHostState *main_host;
     const SysBusDevice *main_host_sbd;
 
     pxb_host = PCI_HOST_BRIDGE(dev);
     pxb_bus = pxb_host->bus;
     pxb_dev = convert_to_pxb(pxb_bus->parent_dev);
     position = g_list_index(pxb_dev_list, pxb_dev);
     assert(position >= 0);
 
     pxb_dev_base = DEVICE(pxb_dev);
     main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent);
     main_host_sbd = SYS_BUS_DEVICE(main_host);
 
     if (main_host_sbd->num_mmio > 0) {
         return g_strdup_printf(TARGET_FMT_plx ",%x",
                                main_host_sbd->mmio[0].addr, position + 1);
     }
     if (main_host_sbd->num_pio > 0) {
         return g_strdup_printf("i%04x,%x",
                                main_host_sbd->pio[0], position + 1);
     }
     return NULL;
 }
 
 static void pxb_host_class_init(ObjectClass *class, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(class);
     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class);
     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class);
 
     dc->fw_name = "pci";
     /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */
     dc->user_creatable = false;
     sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address;
     hc->root_bus_path = pxb_host_root_bus_path;
 }
 
 static const TypeInfo pxb_host_info = {
     .name          = TYPE_PXB_HOST,
     .parent        = TYPE_PCI_HOST_BRIDGE,
     .class_init    = pxb_host_class_init,
 };
 
 static void pxb_cxl_realize(DeviceState *dev, Error **errp)
 {
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     CXLHost *cxl = PXB_CXL_HOST(dev);
     CXLComponentState *cxl_cstate = &cxl->cxl_cstate;
     struct MemoryRegion *mr = &cxl_cstate->crb.component_registers;
 
     cxl_component_register_block_init(OBJECT(dev), cxl_cstate,
                                       TYPE_PXB_CXL_HOST);
     sysbus_init_mmio(sbd, mr);
 }
 
 /*
  * Host bridge realization has no means of knowning state associated
  * with a particular machine. As such, it is nececssary to delay
  * final setup of the host bridge register space until later in the
  * machine bring up.
  */
 void pxb_cxl_hook_up_registers(CXLState *cxl_state, PCIBus *bus, Error **errp)
 {
     PXBDev *pxb =  PXB_CXL_DEV(pci_bridge_get_device(bus));
     CXLHost *cxl = pxb->cxl.cxl_host_bridge;
     CXLComponentState *cxl_cstate = &cxl->cxl_cstate;
     struct MemoryRegion *mr = &cxl_cstate->crb.component_registers;
     hwaddr offset;
 
     offset = memory_region_size(mr) * cxl_state->next_mr_idx;
     if (offset > memory_region_size(&cxl_state->host_mr)) {
         error_setg(errp, "Insufficient space for pxb cxl host register space");
         return;
     }
 
     memory_region_add_subregion(&cxl_state->host_mr, offset, mr);
     cxl_state->next_mr_idx++;
 }
 
 static void pxb_cxl_host_class_init(ObjectClass *class, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(class);
     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class);
 
     hc->root_bus_path = pxb_host_root_bus_path;
     dc->fw_name = "cxl";
     dc->realize = pxb_cxl_realize;
     /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */
     dc->user_creatable = false;
 }
 
 /*
  * This is a device to handle the MMIO for a CXL host bridge. It does nothing
  * else.
  */
 static const TypeInfo cxl_host_info = {
     .name          = TYPE_PXB_CXL_HOST,
     .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(CXLHost),
     .class_init    = pxb_cxl_host_class_init,
 };
 
 /*
  * Registers the PXB bus as a child of pci host root bus.
  */
 static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp)
 {
     PCIBus *bus = pci_get_bus(dev);
     int pxb_bus_num = pci_bus_num(pxb_bus);
 
     if (bus->parent_dev) {
         error_setg(errp, "PXB devices can be attached only to root bus");
         return;
     }
 
     QLIST_FOREACH(bus, &bus->child, sibling) {
         if (pci_bus_num(bus) == pxb_bus_num) {
             error_setg(errp, "Bus %d is already in use", pxb_bus_num);
             return;
         }
     }
     QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling);
 }
 
 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
 {
     PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev;
 
     /*
      * First carry out normal swizzle to handle
      * multple root ports on a pxb instance.
      */
     pin = pci_swizzle_map_irq_fn(pci_dev, pin);
 
     /*
      * The bios does not index the pxb slot number when
      * it computes the IRQ because it resides on bus 0
      * and not on the current bus.
      * However QEMU routes the irq through bus 0 and adds
      * the pxb slot to the IRQ computation of the PXB
      * device.
      *
      * Synchronize between bios and QEMU by canceling
      * pxb's effect.
      */
     return pin - PCI_SLOT(pxb->devfn);
 }
 
 static void pxb_dev_reset(DeviceState *dev)
 {
     CXLHost *cxl = PXB_CXL_DEV(dev)->cxl.cxl_host_bridge;
     CXLComponentState *cxl_cstate = &cxl->cxl_cstate;
     uint32_t *reg_state = cxl_cstate->crb.cache_mem_registers;
     uint32_t *write_msk = cxl_cstate->crb.cache_mem_regs_write_mask;
 
     cxl_component_register_init_common(reg_state, write_msk, CXL2_ROOT_PORT);
     ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, TARGET_COUNT, 8);
 }
 
 static gint pxb_compare(gconstpointer a, gconstpointer b)
 {
     const PXBDev *pxb_a = a, *pxb_b = b;
 
     return pxb_a->bus_nr < pxb_b->bus_nr ? -1 :
            pxb_a->bus_nr > pxb_b->bus_nr ?  1 :
            0;
 }
 
 static void pxb_dev_realize_common(PCIDevice *dev, enum BusType type,
                                    Error **errp)
 {
     PXBDev *pxb = convert_to_pxb(dev);
     DeviceState *ds, *bds = NULL;
     PCIBus *bus;
     const char *dev_name = NULL;
     Error *local_err = NULL;
     MachineState *ms = MACHINE(qdev_get_machine());
 
     if (ms->numa_state == NULL) {
         error_setg(errp, "NUMA is not supported by this machine-type");
         return;
     }
 
     if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
         pxb->numa_node >= ms->numa_state->num_nodes) {
         error_setg(errp, "Illegal numa node %d", pxb->numa_node);
         return;
     }
 
     if (dev->qdev.id && *dev->qdev.id) {
         dev_name = dev->qdev.id;
     }
 
     ds = qdev_new(type == CXL ? TYPE_PXB_CXL_HOST : TYPE_PXB_HOST);
     if (type == PCIE) {
         bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS);
     } else if (type == CXL) {
         bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_CXL_BUS);
         bus->flags |= PCI_BUS_CXL;
         PXB_CXL_DEV(dev)->cxl.cxl_host_bridge = PXB_CXL_HOST(ds);
     } else {
         bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
         bds = qdev_new("pci-bridge");
         bds->id = g_strdup(dev_name);
         qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr);
         qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false);
     }
 
     bus->parent_dev = dev;
     bus->address_space_mem = pci_get_bus(dev)->address_space_mem;
     bus->address_space_io = pci_get_bus(dev)->address_space_io;
     bus->map_irq = pxb_map_irq_fn;
 
     PCI_HOST_BRIDGE(ds)->bus = bus;
     PCI_HOST_BRIDGE(ds)->bypass_iommu = pxb->bypass_iommu;
 
     pxb_register_bus(dev, bus, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         goto err_register_bus;
     }
 
     sysbus_realize_and_unref(SYS_BUS_DEVICE(ds), &error_fatal);
     if (bds) {
         qdev_realize_and_unref(bds, &bus->qbus, &error_fatal);
     }
 
     pci_word_test_and_set_mask(dev->config + PCI_STATUS,
                                PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
     pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);
 
     pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare);
     return;
 
 err_register_bus:
     object_unref(OBJECT(bds));
     object_unparent(OBJECT(bus));
     object_unref(OBJECT(ds));
 }
 
 static void pxb_dev_realize(PCIDevice *dev, Error **errp)
 {
     if (pci_bus_is_express(pci_get_bus(dev))) {
         error_setg(errp, "pxb devices cannot reside on a PCIe bus");
         return;
     }
 
     pxb_dev_realize_common(dev, PCI, errp);
 }
 
 static void pxb_dev_exitfn(PCIDevice *pci_dev)
 {
     PXBDev *pxb = convert_to_pxb(pci_dev);
 
     pxb_dev_list = g_list_remove(pxb_dev_list, pxb);
 }
 
 static Property pxb_dev_properties[] = {
     /* Note: 0 is not a legal PXB bus number. */
     DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
     DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
     DEFINE_PROP_BOOL("bypass_iommu", PXBDev, bypass_iommu, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
 static void pxb_dev_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->realize = pxb_dev_realize;
     k->exit = pxb_dev_exitfn;
     k->vendor_id = PCI_VENDOR_ID_REDHAT;
     k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
     k->class_id = PCI_CLASS_BRIDGE_HOST;
 
     dc->desc = "PCI Expander Bridge";
     device_class_set_props(dc, pxb_dev_properties);
     dc->hotpluggable = false;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 }
 
 static const TypeInfo pxb_dev_info = {
     .name          = TYPE_PXB_DEVICE,
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PXBDev),
     .class_init    = pxb_dev_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
         { },
     },
 };
 
 static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp)
 {
     if (!pci_bus_is_express(pci_get_bus(dev))) {
         error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus");
         return;
     }
 
     pxb_dev_realize_common(dev, PCIE, errp);
 }
 
 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->realize = pxb_pcie_dev_realize;
     k->exit = pxb_dev_exitfn;
     k->vendor_id = PCI_VENDOR_ID_REDHAT;
     k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE;
     k->class_id = PCI_CLASS_BRIDGE_HOST;
 
     dc->desc = "PCI Express Expander Bridge";
     device_class_set_props(dc, pxb_dev_properties);
     dc->hotpluggable = false;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 }
 
 static const TypeInfo pxb_pcie_dev_info = {
     .name          = TYPE_PXB_PCIE_DEVICE,
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PXBDev),
     .class_init    = pxb_pcie_dev_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
         { },
     },
 };
 
 static void pxb_cxl_dev_realize(PCIDevice *dev, Error **errp)
 {
     /* A CXL PXB's parent bus is still PCIe */
     if (!pci_bus_is_express(pci_get_bus(dev))) {
         error_setg(errp, "pxb-cxl devices cannot reside on a PCI bus");
         return;
     }
 
     pxb_dev_realize_common(dev, CXL, errp);
     pxb_dev_reset(DEVICE(dev));
 }
 
 static void pxb_cxl_dev_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc   = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->realize             = pxb_cxl_dev_realize;
     k->exit                = pxb_dev_exitfn;
     /*
      * XXX: These types of bridges don't actually show up in the hierarchy so
      * vendor, device, class, etc. ids are intentionally left out.
      */
 
     dc->desc = "CXL Host Bridge";
     device_class_set_props(dc, pxb_dev_properties);
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 
     /* Host bridges aren't hotpluggable. FIXME: spec reference */
     dc->hotpluggable = false;
     dc->reset = pxb_dev_reset;
 }
 
 static const TypeInfo pxb_cxl_dev_info = {
     .name          = TYPE_PXB_CXL_DEVICE,
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PXBDev),
     .class_init    = pxb_cxl_dev_class_init,
     .interfaces =
         (InterfaceInfo[]){
             { INTERFACE_CONVENTIONAL_PCI_DEVICE },
             {},
         },
 };
 
 static void pxb_register_types(void)
 {
     type_register_static(&pxb_bus_info);
     type_register_static(&pxb_pcie_bus_info);
     type_register_static(&pxb_cxl_bus_info);
     type_register_static(&pxb_host_info);
     type_register_static(&cxl_host_info);
     type_register_static(&pxb_dev_info);
     type_register_static(&pxb_pcie_dev_info);
     type_register_static(&pxb_cxl_dev_info);
 }
 
 type_init(pxb_register_types)