/* * QEMU i440FX PCI Bridge Emulation * * Copyright (c) 2006 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "qemu/osdep.h" #include "hw/i386/pc.h" #include "hw/pci/pci.h" #include "hw/pci/pci_host.h" #include "hw/pci-host/i440fx.h" #include "hw/qdev-properties.h" #include "hw/sysbus.h" #include "qapi/error.h" #include "migration/vmstate.h" #include "qapi/visitor.h" #include "qemu/error-report.h" /* * I440FX chipset data sheet. * https://wiki.qemu.org/File:29054901.pdf */ #define I440FX_PCI_HOST_BRIDGE(obj) \ OBJECT_CHECK(I440FXState, (obj), TYPE_I440FX_PCI_HOST_BRIDGE) typedef struct I440FXState { PCIHostState parent_obj; Range pci_hole; uint64_t pci_hole64_size; bool pci_hole64_fix; uint32_t short_root_bus; } I440FXState; #define I440FX_PAM 0x59 #define I440FX_PAM_SIZE 7 #define I440FX_SMRAM 0x72 /* Keep it 2G to comply with older win32 guests */ #define I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 31) /* Older coreboot versions (4.0 and older) read a config register that doesn't * exist in real hardware, to get the RAM size from QEMU. */ #define I440FX_COREBOOT_RAM_SIZE 0x57 static void i440fx_update_memory_mappings(PCII440FXState *d) { int i; PCIDevice *pd = PCI_DEVICE(d); memory_region_transaction_begin(); for (i = 0; i < ARRAY_SIZE(d->pam_regions); i++) { pam_update(&d->pam_regions[i], i, pd->config[I440FX_PAM + DIV_ROUND_UP(i, 2)]); } memory_region_set_enabled(&d->smram_region, !(pd->config[I440FX_SMRAM] & SMRAM_D_OPEN)); memory_region_set_enabled(&d->smram, pd->config[I440FX_SMRAM] & SMRAM_G_SMRAME); memory_region_transaction_commit(); } static void i440fx_write_config(PCIDevice *dev, uint32_t address, uint32_t val, int len) { PCII440FXState *d = I440FX_PCI_DEVICE(dev); /* XXX: implement SMRAM.D_LOCK */ pci_default_write_config(dev, address, val, len); if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) || range_covers_byte(address, len, I440FX_SMRAM)) { i440fx_update_memory_mappings(d); } } static int i440fx_post_load(void *opaque, int version_id) { PCII440FXState *d = opaque; i440fx_update_memory_mappings(d); return 0; } static const VMStateDescription vmstate_i440fx = { .name = "I440FX", .version_id = 3, .minimum_version_id = 3, .post_load = i440fx_post_load, .fields = (VMStateField[]) { VMSTATE_PCI_DEVICE(parent_obj, PCII440FXState), /* Used to be smm_enabled, which was basically always zero because * SeaBIOS hardly uses SMM. SMRAM is now handled by CPU code. */ VMSTATE_UNUSED(1), VMSTATE_END_OF_LIST() } }; static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); uint64_t val64; uint32_t value; val64 = range_is_empty(&s->pci_hole) ? 0 : range_lob(&s->pci_hole); value = val64; assert(value == val64); visit_type_uint32(v, name, &value, errp); } static void i440fx_pcihost_get_pci_hole_end(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); uint64_t val64; uint32_t value; val64 = range_is_empty(&s->pci_hole) ? 0 : range_upb(&s->pci_hole) + 1; value = val64; assert(value == val64); visit_type_uint32(v, name, &value, errp); } /* * The 64bit PCI hole start is set by the Guest firmware * as the address of the first 64bit PCI MEM resource. * If no PCI device has resources on the 64bit area, * the 64bit PCI hole will start after "over 4G RAM" and the * reserved space for memory hotplug if any. */ static uint64_t i440fx_pcihost_get_pci_hole64_start_value(Object *obj) { PCIHostState *h = PCI_HOST_BRIDGE(obj); I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); Range w64; uint64_t value; pci_bus_get_w64_range(h->bus, &w64); value = range_is_empty(&w64) ? 0 : range_lob(&w64); if (!value && s->pci_hole64_fix) { value = pc_pci_hole64_start(); } return value; } static void i440fx_pcihost_get_pci_hole64_start(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); visit_type_uint64(v, name, &hole64_start, errp); } /* * The 64bit PCI hole end is set by the Guest firmware * as the address of the last 64bit PCI MEM resource. * Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE * that can be configured by the user. */ static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { PCIHostState *h = PCI_HOST_BRIDGE(obj); I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); Range w64; uint64_t value, hole64_end; pci_bus_get_w64_range(h->bus, &w64); value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1; hole64_end = ROUND_UP(hole64_start + s->pci_hole64_size, 1ULL << 30); if (s->pci_hole64_fix && value < hole64_end) { value = hole64_end; } visit_type_uint64(v, name, &value, errp); } static void i440fx_pcihost_initfn(Object *obj) { PCIHostState *s = PCI_HOST_BRIDGE(obj); memory_region_init_io(&s->conf_mem, obj, &pci_host_conf_le_ops, s, "pci-conf-idx", 4); memory_region_init_io(&s->data_mem, obj, &pci_host_data_le_ops, s, "pci-conf-data", 4); object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "uint32", i440fx_pcihost_get_pci_hole_start, NULL, NULL, NULL, NULL); object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "uint32", i440fx_pcihost_get_pci_hole_end, NULL, NULL, NULL, NULL); object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "uint64", i440fx_pcihost_get_pci_hole64_start, NULL, NULL, NULL, NULL); object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "uint64", i440fx_pcihost_get_pci_hole64_end, NULL, NULL, NULL, NULL); } static void i440fx_pcihost_realize(DeviceState *dev, Error **errp) { PCIHostState *s = PCI_HOST_BRIDGE(dev); SysBusDevice *sbd = SYS_BUS_DEVICE(dev); sysbus_add_io(sbd, 0xcf8, &s->conf_mem); sysbus_init_ioports(sbd, 0xcf8, 4); sysbus_add_io(sbd, 0xcfc, &s->data_mem); sysbus_init_ioports(sbd, 0xcfc, 4); /* register i440fx 0xcf8 port as coalesced pio */ memory_region_set_flush_coalesced(&s->data_mem); memory_region_add_coalescing(&s->conf_mem, 0, 4); } static void i440fx_realize(PCIDevice *dev, Error **errp) { dev->config[I440FX_SMRAM] = 0x02; if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) { warn_report("i440fx doesn't support emulated iommu"); } } PCIBus *i440fx_init(const char *host_type, const char *pci_type, PCII440FXState **pi440fx_state, MemoryRegion *address_space_mem, MemoryRegion *address_space_io, ram_addr_t ram_size, ram_addr_t below_4g_mem_size, ram_addr_t above_4g_mem_size, MemoryRegion *pci_address_space, MemoryRegion *ram_memory) { DeviceState *dev; PCIBus *b; PCIDevice *d; PCIHostState *s; PCII440FXState *f; unsigned i; I440FXState *i440fx; dev = qdev_create(NULL, host_type); s = PCI_HOST_BRIDGE(dev); b = pci_root_bus_new(dev, NULL, pci_address_space, address_space_io, 0, TYPE_PCI_BUS); s->bus = b; object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev), NULL); qdev_init_nofail(dev); d = pci_create_simple(b, 0, pci_type); *pi440fx_state = I440FX_PCI_DEVICE(d); f = *pi440fx_state; f->system_memory = address_space_mem; f->pci_address_space = pci_address_space; f->ram_memory = ram_memory; i440fx = I440FX_PCI_HOST_BRIDGE(dev); range_set_bounds(&i440fx->pci_hole, below_4g_mem_size, IO_APIC_DEFAULT_ADDRESS - 1); /* setup pci memory mapping */ pc_pci_as_mapping_init(OBJECT(f), f->system_memory, f->pci_address_space); /* if *disabled* show SMRAM to all CPUs */ memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region", f->pci_address_space, 0xa0000, 0x20000); memory_region_add_subregion_overlap(f->system_memory, 0xa0000, &f->smram_region, 1); memory_region_set_enabled(&f->smram_region, true); /* smram, as seen by SMM CPUs */ memory_region_init(&f->smram, OBJECT(d), "smram", 1ull << 32); memory_region_set_enabled(&f->smram, true); memory_region_init_alias(&f->low_smram, OBJECT(d), "smram-low", f->ram_memory, 0xa0000, 0x20000); memory_region_set_enabled(&f->low_smram, true); memory_region_add_subregion(&f->smram, 0xa0000, &f->low_smram); object_property_add_const_link(qdev_get_machine(), "smram", OBJECT(&f->smram), &error_abort); init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space, &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE); for (i = 0; i < ARRAY_SIZE(f->pam_regions) - 1; ++i) { init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space, &f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE); } ram_size = ram_size / 8 / 1024 / 1024; if (ram_size > 255) { ram_size = 255; } d->config[I440FX_COREBOOT_RAM_SIZE] = ram_size; i440fx_update_memory_mappings(f); return b; } PCIBus *find_i440fx(void) { PCIHostState *s = OBJECT_CHECK(PCIHostState, object_resolve_path("/machine/i440fx", NULL), TYPE_PCI_HOST_BRIDGE); return s ? s->bus : NULL; } static void i440fx_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); k->realize = i440fx_realize; k->config_write = i440fx_write_config; k->vendor_id = PCI_VENDOR_ID_INTEL; k->device_id = PCI_DEVICE_ID_INTEL_82441; k->revision = 0x02; k->class_id = PCI_CLASS_BRIDGE_HOST; dc->desc = "Host bridge"; dc->vmsd = &vmstate_i440fx; /* * PCI-facing part of the host bridge, not usable without the * host-facing part, which can't be device_add'ed, yet. */ dc->user_creatable = false; dc->hotpluggable = false; } static const TypeInfo i440fx_info = { .name = TYPE_I440FX_PCI_DEVICE, .parent = TYPE_PCI_DEVICE, .instance_size = sizeof(PCII440FXState), .class_init = i440fx_class_init, .interfaces = (InterfaceInfo[]) { { INTERFACE_CONVENTIONAL_PCI_DEVICE }, { }, }, }; /* 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 void host_pci_config_read(int pos, int len, uint32_t *val, Error **errp) { int rc, config_fd; /* Access real host bridge. */ char *path = g_strdup_printf("/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s", 0, 0, 0, 0, "config"); config_fd = open(path, O_RDWR); if (config_fd < 0) { error_setg_errno(errp, errno, "Failed to open: %s", path); goto out; } if (lseek(config_fd, pos, SEEK_SET) != pos) { error_setg_errno(errp, errno, "Failed to seek: %s", path); goto out_close_fd; } do { rc = read(config_fd, (uint8_t *)val, len); } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); if (rc != len) { error_setg_errno(errp, errno, "Failed to read: %s", path); } out_close_fd: close(config_fd); out: g_free(path); } static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp) { uint32_t val = 0; int i, num; int pos, len; Error *local_err = NULL; 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; host_pci_config_read(pos, len, &val, &local_err); if (local_err) { error_propagate(errp, local_err); return; } pci_default_write_config(pci_dev, pos, val, len); } } static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); k->realize = igd_pt_i440fx_realize; 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) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(host_bridge); /* For backwards compat with old device paths */ if (s->short_root_bus) { return "0000"; } return "0000:00"; } static Property i440fx_props[] = { DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState, pci_hole64_size, I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT), DEFINE_PROP_UINT32("short_root_bus", I440FXState, short_root_bus, 0), DEFINE_PROP_BOOL("x-pci-hole64-fix", I440FXState, pci_hole64_fix, true), DEFINE_PROP_END_OF_LIST(), }; static void i440fx_pcihost_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass); hc->root_bus_path = i440fx_pcihost_root_bus_path; dc->realize = i440fx_pcihost_realize; dc->fw_name = "pci"; dc->props = i440fx_props; /* Reason: needs to be wired up by pc_init1 */ dc->user_creatable = false; } static const TypeInfo i440fx_pcihost_info = { .name = TYPE_I440FX_PCI_HOST_BRIDGE, .parent = TYPE_PCI_HOST_BRIDGE, .instance_size = sizeof(I440FXState), .instance_init = i440fx_pcihost_initfn, .class_init = i440fx_pcihost_class_init, }; static void i440fx_register_types(void) { type_register_static(&i440fx_info); type_register_static(&igd_passthrough_i440fx_info); type_register_static(&i440fx_pcihost_info); } type_init(i440fx_register_types)