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Rev | Author | Line No. | Line |
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428 | giacomo | 1 | /* |
2 | * pci_syscall.c |
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3 | * |
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4 | * For architectures where we want to allow direct access |
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5 | * to the PCI config stuff - it would probably be preferable |
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6 | * on PCs too, but there people just do it by hand with the |
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7 | * magic northbridge registers.. |
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8 | */ |
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9 | |||
10 | #include <linux/sched.h> |
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11 | #include <linux/errno.h> |
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12 | #include <linux/pci.h> |
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13 | #include <linux/smp_lock.h> |
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14 | #include <asm/uaccess.h> |
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15 | |||
16 | |||
17 | asmlinkage long |
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18 | sys_pciconfig_read(unsigned long bus, unsigned long dfn, |
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19 | unsigned long off, unsigned long len, void *buf) |
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20 | { |
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21 | struct pci_dev *dev; |
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22 | u8 byte; |
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23 | u16 word; |
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24 | u32 dword; |
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25 | long err, cfg_ret; |
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26 | |||
27 | err = -EPERM; |
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28 | if (!capable(CAP_SYS_ADMIN)) |
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29 | goto error; |
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30 | |||
31 | err = -ENODEV; |
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32 | dev = pci_find_slot(bus, dfn); |
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33 | if (!dev) |
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34 | goto error; |
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35 | |||
36 | lock_kernel(); |
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37 | switch (len) { |
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38 | case 1: |
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39 | cfg_ret = pci_read_config_byte(dev, off, &byte); |
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40 | break; |
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41 | case 2: |
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42 | cfg_ret = pci_read_config_word(dev, off, &word); |
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43 | break; |
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44 | case 4: |
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45 | cfg_ret = pci_read_config_dword(dev, off, &dword); |
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46 | break; |
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47 | default: |
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48 | err = -EINVAL; |
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49 | unlock_kernel(); |
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50 | goto error; |
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51 | }; |
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52 | unlock_kernel(); |
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53 | |||
54 | err = -EIO; |
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55 | if (cfg_ret != PCIBIOS_SUCCESSFUL) |
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56 | goto error; |
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57 | |||
58 | switch (len) { |
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59 | case 1: |
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60 | err = put_user(byte, (unsigned char *)buf); |
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61 | break; |
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62 | case 2: |
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63 | err = put_user(word, (unsigned short *)buf); |
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64 | break; |
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65 | case 4: |
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66 | err = put_user(dword, (unsigned int *)buf); |
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67 | break; |
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68 | }; |
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69 | return err; |
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70 | |||
71 | error: |
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72 | /* ??? XFree86 doesn't even check the return value. They |
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73 | just look for 0xffffffff in the output, since that's what |
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74 | they get instead of a machine check on x86. */ |
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75 | switch (len) { |
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76 | case 1: |
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77 | put_user(-1, (unsigned char *)buf); |
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78 | break; |
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79 | case 2: |
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80 | put_user(-1, (unsigned short *)buf); |
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81 | break; |
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82 | case 4: |
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83 | put_user(-1, (unsigned int *)buf); |
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84 | break; |
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85 | }; |
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86 | return err; |
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87 | } |
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88 | |||
89 | asmlinkage long |
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90 | sys_pciconfig_write(unsigned long bus, unsigned long dfn, |
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91 | unsigned long off, unsigned long len, void *buf) |
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92 | { |
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93 | struct pci_dev *dev; |
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94 | u8 byte; |
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95 | u16 word; |
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96 | u32 dword; |
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97 | int err = 0; |
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98 | |||
99 | if (!capable(CAP_SYS_ADMIN)) |
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100 | return -EPERM; |
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101 | |||
102 | dev = pci_find_slot(bus, dfn); |
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103 | if (!dev) |
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104 | return -ENODEV; |
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105 | |||
106 | lock_kernel(); |
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107 | switch(len) { |
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108 | case 1: |
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109 | err = get_user(byte, (u8 *)buf); |
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110 | if (err) |
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111 | break; |
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112 | err = pci_write_config_byte(dev, off, byte); |
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113 | if (err != PCIBIOS_SUCCESSFUL) |
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114 | err = -EIO; |
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115 | break; |
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116 | |||
117 | case 2: |
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118 | err = get_user(word, (u16 *)buf); |
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119 | if (err) |
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120 | break; |
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121 | err = pci_write_config_word(dev, off, word); |
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122 | if (err != PCIBIOS_SUCCESSFUL) |
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123 | err = -EIO; |
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124 | break; |
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125 | |||
126 | case 4: |
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127 | err = get_user(dword, (u32 *)buf); |
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128 | if (err) |
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129 | break; |
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130 | err = pci_write_config_dword(dev, off, dword); |
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131 | if (err != PCIBIOS_SUCCESSFUL) |
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132 | err = -EIO; |
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133 | break; |
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134 | |||
135 | default: |
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136 | err = -EINVAL; |
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137 | break; |
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138 | }; |
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139 | unlock_kernel(); |
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140 | |||
141 | return err; |
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142 | } |