diff options
Diffstat (limited to 'hw/pci-host/xen_igd_pt.c')
| -rw-r--r-- | hw/pci-host/xen_igd_pt.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/hw/pci-host/xen_igd_pt.c b/hw/pci-host/xen_igd_pt.c new file mode 100644 index 000000000..d094b675d --- /dev/null +++ b/hw/pci-host/xen_igd_pt.c @@ -0,0 +1,119 @@ +/* + * QEMU Intel IGD Passthrough Host Bridge Emulation + * + * Copyright (c) 2006 Fabrice Bellard + * + * SPDX-License-Identifier: MIT + * + * 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/pci/pci.h" +#include "hw/pci/pci_host.h" +#include "hw/pci-host/i440fx.h" +#include "qapi/error.h" + +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[] = { + {PCI_REVISION_ID, 2}, + {PCI_SUBSYSTEM_VENDOR_ID, 2}, + {PCI_SUBSYSTEM_ID, 2}, + {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) +{ + ERRP_GUARD(); + uint32_t val = 0; + size_t i; + int pos, len; + + for (i = 0; i < ARRAY_SIZE(igd_host_bridge_infos); i++) { + pos = igd_host_bridge_infos[i].offset; + len = igd_host_bridge_infos[i].len; + host_pci_config_read(pos, len, &val, errp); + if (*errp) { + 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 void igd_pt_i440fx_register_types(void) +{ + type_register_static(&igd_passthrough_i440fx_info); +} + +type_init(igd_pt_i440fx_register_types) |