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1401897c PMD |
1 | /* |
2 | * QEMU Intel IGD Passthrough Host Bridge Emulation | |
3 | * | |
4 | * Copyright (c) 2006 Fabrice Bellard | |
5 | * | |
6 | * SPDX-License-Identifier: MIT | |
7 | * | |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be included in | |
16 | * all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
24 | * THE SOFTWARE. | |
25 | */ | |
26 | ||
27 | #include "qemu/osdep.h" | |
28 | #include "hw/pci/pci.h" | |
29 | #include "hw/pci/pci_host.h" | |
30 | #include "hw/pci-host/i440fx.h" | |
31 | #include "qapi/error.h" | |
32 | ||
33 | typedef struct { | |
34 | uint8_t offset; | |
35 | uint8_t len; | |
36 | } IGDHostInfo; | |
37 | ||
38 | /* Here we just expose minimal host bridge offset subset. */ | |
39 | static const IGDHostInfo igd_host_bridge_infos[] = { | |
40 | {PCI_REVISION_ID, 2}, | |
41 | {PCI_SUBSYSTEM_VENDOR_ID, 2}, | |
42 | {PCI_SUBSYSTEM_ID, 2}, | |
43 | {0x50, 2}, /* SNB: processor graphics control register */ | |
44 | {0x52, 2}, /* processor graphics control register */ | |
45 | {0xa4, 4}, /* SNB: graphics base of stolen memory */ | |
46 | {0xa8, 4}, /* SNB: base of GTT stolen memory */ | |
47 | }; | |
48 | ||
49 | static void host_pci_config_read(int pos, int len, uint32_t *val, Error **errp) | |
50 | { | |
51 | int rc, config_fd; | |
52 | /* Access real host bridge. */ | |
53 | char *path = g_strdup_printf("/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s", | |
54 | 0, 0, 0, 0, "config"); | |
55 | ||
56 | config_fd = open(path, O_RDWR); | |
57 | if (config_fd < 0) { | |
58 | error_setg_errno(errp, errno, "Failed to open: %s", path); | |
59 | goto out; | |
60 | } | |
61 | ||
62 | if (lseek(config_fd, pos, SEEK_SET) != pos) { | |
63 | error_setg_errno(errp, errno, "Failed to seek: %s", path); | |
64 | goto out_close_fd; | |
65 | } | |
66 | ||
67 | do { | |
68 | rc = read(config_fd, (uint8_t *)val, len); | |
69 | } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); | |
70 | if (rc != len) { | |
71 | error_setg_errno(errp, errno, "Failed to read: %s", path); | |
72 | } | |
73 | ||
74 | out_close_fd: | |
75 | close(config_fd); | |
76 | out: | |
77 | g_free(path); | |
78 | } | |
79 | ||
80 | static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp) | |
81 | { | |
82 | uint32_t val = 0; | |
83 | size_t i; | |
84 | int pos, len; | |
85 | Error *local_err = NULL; | |
86 | ||
87 | for (i = 0; i < ARRAY_SIZE(igd_host_bridge_infos); i++) { | |
88 | pos = igd_host_bridge_infos[i].offset; | |
89 | len = igd_host_bridge_infos[i].len; | |
90 | host_pci_config_read(pos, len, &val, &local_err); | |
91 | if (local_err) { | |
92 | error_propagate(errp, local_err); | |
93 | return; | |
94 | } | |
95 | pci_default_write_config(pci_dev, pos, val, len); | |
96 | } | |
97 | } | |
98 | ||
99 | static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data) | |
100 | { | |
101 | DeviceClass *dc = DEVICE_CLASS(klass); | |
102 | PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); | |
103 | ||
104 | k->realize = igd_pt_i440fx_realize; | |
105 | dc->desc = "IGD Passthrough Host bridge"; | |
106 | } | |
107 | ||
108 | static const TypeInfo igd_passthrough_i440fx_info = { | |
109 | .name = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE, | |
110 | .parent = TYPE_I440FX_PCI_DEVICE, | |
111 | .instance_size = sizeof(PCII440FXState), | |
112 | .class_init = igd_passthrough_i440fx_class_init, | |
113 | }; | |
114 | ||
115 | static void igd_pt_i440fx_register_types(void) | |
116 | { | |
117 | type_register_static(&igd_passthrough_i440fx_info); | |
118 | } | |
119 | ||
120 | type_init(igd_pt_i440fx_register_types) |