diff options
Diffstat (limited to 'hw/pci-host/piix.c')
| -rw-r--r-- | hw/pci-host/piix.c | 94 |
1 files changed, 89 insertions, 5 deletions
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c index 1cb25f3fa6..1fb71c8081 100644 --- a/hw/pci-host/piix.c +++ b/hw/pci-host/piix.c @@ -40,7 +40,6 @@ * http://download.intel.com/design/chipsets/datashts/29054901.pdf */ -#define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost" #define I440FX_PCI_HOST_BRIDGE(obj) \ OBJECT_CHECK(I440FXState, (obj), TYPE_I440FX_PCI_HOST_BRIDGE) @@ -95,7 +94,6 @@ typedef struct PIIX3State { #define PIIX3_PCI_DEVICE(obj) \ OBJECT_CHECK(PIIX3State, (obj), TYPE_PIIX3_PCI_DEVICE) -#define TYPE_I440FX_PCI_DEVICE "i440FX" #define I440FX_PCI_DEVICE(obj) \ OBJECT_CHECK(PCII440FXState, (obj), TYPE_I440FX_PCI_DEVICE) @@ -305,7 +303,8 @@ static void i440fx_realize(PCIDevice *dev, Error **errp) dev->config[I440FX_SMRAM] = 0x02; } -PCIBus *i440fx_init(PCII440FXState **pi440fx_state, +PCIBus *i440fx_init(const char *host_type, const char *pci_type, + PCII440FXState **pi440fx_state, int *piix3_devfn, ISABus **isa_bus, qemu_irq *pic, MemoryRegion *address_space_mem, @@ -325,7 +324,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state, unsigned i; I440FXState *i440fx; - dev = qdev_create(NULL, TYPE_I440FX_PCI_HOST_BRIDGE); + dev = qdev_create(NULL, host_type); s = PCI_HOST_BRIDGE(dev); b = pci_bus_new(dev, NULL, pci_address_space, address_space_io, 0, TYPE_PCI_BUS); @@ -333,7 +332,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state, object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev), NULL); qdev_init_nofail(dev); - d = pci_create_simple(b, 0, TYPE_I440FX_PCI_DEVICE); + d = pci_create_simple(b, 0, pci_type); *pi440fx_state = I440FX_PCI_DEVICE(d); f = *pi440fx_state; f->system_memory = address_space_mem; @@ -740,6 +739,90 @@ static const TypeInfo i440fx_info = { .class_init = i440fx_class_init, }; +/* IGD Passthrough Host Bridge. */ +typedef struct { + uint8_t offset; + uint8_t len; +} IGDHostInfo; + +/* Here we just expose minimal host bridge offset subset. */ +static const IGDHostInfo igd_host_bridge_infos[] = { + {0x08, 2}, /* revision id */ + {0x2c, 2}, /* sybsystem vendor id */ + {0x2e, 2}, /* sybsystem id */ + {0x50, 2}, /* SNB: processor graphics control register */ + {0x52, 2}, /* processor graphics control register */ + {0xa4, 4}, /* SNB: graphics base of stolen memory */ + {0xa8, 4}, /* SNB: base of GTT stolen memory */ +}; + +static int host_pci_config_read(int pos, int len, uint32_t val) +{ + char path[PATH_MAX]; + int config_fd; + ssize_t size = sizeof(path); + /* Access real host bridge. */ + int rc = snprintf(path, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s", + 0, 0, 0, 0, "config"); + + if (rc >= size || rc < 0) { + return -ENODEV; + } + + config_fd = open(path, O_RDWR); + if (config_fd < 0) { + return -ENODEV; + } + + if (lseek(config_fd, pos, SEEK_SET) != pos) { + return -errno; + } + do { + rc = read(config_fd, (uint8_t *)&val, len); + } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); + if (rc != len) { + return -errno; + } + + return 0; +} + +static int igd_pt_i440fx_initfn(struct PCIDevice *pci_dev) +{ + uint32_t val = 0; + int rc, i, num; + int pos, len; + + num = ARRAY_SIZE(igd_host_bridge_infos); + for (i = 0; i < num; i++) { + pos = igd_host_bridge_infos[i].offset; + len = igd_host_bridge_infos[i].len; + rc = host_pci_config_read(pos, len, val); + if (rc) { + return -ENODEV; + } + pci_default_write_config(pci_dev, pos, val, len); + } + + return 0; +} + +static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); + + k->init = igd_pt_i440fx_initfn; + dc->desc = "IGD Passthrough Host bridge"; +} + +static const TypeInfo igd_passthrough_i440fx_info = { + .name = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE, + .parent = TYPE_I440FX_PCI_DEVICE, + .instance_size = sizeof(PCII440FXState), + .class_init = igd_passthrough_i440fx_class_init, +}; + static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge, PCIBus *rootbus) { @@ -781,6 +864,7 @@ static const TypeInfo i440fx_pcihost_info = { static void i440fx_register_types(void) { type_register_static(&i440fx_info); + type_register_static(&igd_passthrough_i440fx_info); type_register_static(&piix3_pci_type_info); type_register_static(&piix3_info); type_register_static(&piix3_xen_info); |