Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
df62ab5e BH |
3 | * For architectures where we want to allow direct access to the PCI config |
4 | * stuff - it would probably be preferable on PCs too, but there people | |
5 | * just do it by hand with the magic northbridge registers. | |
1da177e4 LT |
6 | */ |
7 | ||
1da177e4 LT |
8 | #include <linux/errno.h> |
9 | #include <linux/pci.h> | |
1da177e4 | 10 | #include <linux/syscalls.h> |
7c0f6ba6 | 11 | #include <linux/uaccess.h> |
e04b0ea2 | 12 | #include "pci.h" |
1da177e4 | 13 | |
c4ea37c2 HC |
14 | SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn, |
15 | unsigned long, off, unsigned long, len, void __user *, buf) | |
1da177e4 LT |
16 | { |
17 | struct pci_dev *dev; | |
18 | u8 byte; | |
19 | u16 word; | |
20 | u32 dword; | |
e4585da2 AC |
21 | long err; |
22 | long cfg_ret; | |
1da177e4 | 23 | |
1da177e4 | 24 | if (!capable(CAP_SYS_ADMIN)) |
e4585da2 | 25 | return -EPERM; |
1da177e4 LT |
26 | |
27 | err = -ENODEV; | |
39c94652 | 28 | dev = pci_get_domain_bus_and_slot(0, bus, dfn); |
1da177e4 LT |
29 | if (!dev) |
30 | goto error; | |
31 | ||
1da177e4 LT |
32 | switch (len) { |
33 | case 1: | |
e04b0ea2 | 34 | cfg_ret = pci_user_read_config_byte(dev, off, &byte); |
1da177e4 LT |
35 | break; |
36 | case 2: | |
e04b0ea2 | 37 | cfg_ret = pci_user_read_config_word(dev, off, &word); |
1da177e4 LT |
38 | break; |
39 | case 4: | |
e04b0ea2 | 40 | cfg_ret = pci_user_read_config_dword(dev, off, &dword); |
1da177e4 LT |
41 | break; |
42 | default: | |
43 | err = -EINVAL; | |
1da177e4 | 44 | goto error; |
f7625980 | 45 | } |
1da177e4 LT |
46 | |
47 | err = -EIO; | |
48 | if (cfg_ret != PCIBIOS_SUCCESSFUL) | |
49 | goto error; | |
50 | ||
51 | switch (len) { | |
52 | case 1: | |
53 | err = put_user(byte, (unsigned char __user *)buf); | |
54 | break; | |
55 | case 2: | |
56 | err = put_user(word, (unsigned short __user *)buf); | |
57 | break; | |
58 | case 4: | |
59 | err = put_user(dword, (unsigned int __user *)buf); | |
60 | break; | |
e4585da2 AC |
61 | } |
62 | pci_dev_put(dev); | |
1da177e4 LT |
63 | return err; |
64 | ||
65 | error: | |
66 | /* ??? XFree86 doesn't even check the return value. They | |
67 | just look for 0xffffffff in the output, since that's what | |
68 | they get instead of a machine check on x86. */ | |
69 | switch (len) { | |
70 | case 1: | |
71 | put_user(-1, (unsigned char __user *)buf); | |
72 | break; | |
73 | case 2: | |
74 | put_user(-1, (unsigned short __user *)buf); | |
75 | break; | |
76 | case 4: | |
77 | put_user(-1, (unsigned int __user *)buf); | |
78 | break; | |
e4585da2 AC |
79 | } |
80 | pci_dev_put(dev); | |
1da177e4 LT |
81 | return err; |
82 | } | |
83 | ||
c4ea37c2 HC |
84 | SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn, |
85 | unsigned long, off, unsigned long, len, void __user *, buf) | |
1da177e4 LT |
86 | { |
87 | struct pci_dev *dev; | |
88 | u8 byte; | |
89 | u16 word; | |
90 | u32 dword; | |
91 | int err = 0; | |
92 | ||
93 | if (!capable(CAP_SYS_ADMIN)) | |
94 | return -EPERM; | |
95 | ||
39c94652 | 96 | dev = pci_get_domain_bus_and_slot(0, bus, dfn); |
1da177e4 LT |
97 | if (!dev) |
98 | return -ENODEV; | |
99 | ||
3c78bc61 | 100 | switch (len) { |
1da177e4 LT |
101 | case 1: |
102 | err = get_user(byte, (u8 __user *)buf); | |
103 | if (err) | |
104 | break; | |
e04b0ea2 | 105 | err = pci_user_write_config_byte(dev, off, byte); |
1da177e4 LT |
106 | if (err != PCIBIOS_SUCCESSFUL) |
107 | err = -EIO; | |
108 | break; | |
109 | ||
110 | case 2: | |
111 | err = get_user(word, (u16 __user *)buf); | |
112 | if (err) | |
113 | break; | |
e04b0ea2 | 114 | err = pci_user_write_config_word(dev, off, word); |
1da177e4 LT |
115 | if (err != PCIBIOS_SUCCESSFUL) |
116 | err = -EIO; | |
117 | break; | |
118 | ||
119 | case 4: | |
120 | err = get_user(dword, (u32 __user *)buf); | |
121 | if (err) | |
122 | break; | |
e04b0ea2 | 123 | err = pci_user_write_config_dword(dev, off, dword); |
1da177e4 LT |
124 | if (err != PCIBIOS_SUCCESSFUL) |
125 | err = -EIO; | |
126 | break; | |
127 | ||
128 | default: | |
129 | err = -EINVAL; | |
130 | break; | |
e4585da2 | 131 | } |
e4585da2 | 132 | pci_dev_put(dev); |
1da177e4 LT |
133 | return err; |
134 | } |