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137 lines
2.7 KiB
137 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* For architectures where we want to allow direct access to the PCI config |
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* stuff - it would probably be preferable on PCs too, but there people |
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* just do it by hand with the magic northbridge registers. |
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*/ |
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#include <linux/errno.h> |
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#include <linux/pci.h> |
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#include <linux/security.h> |
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#include <linux/syscalls.h> |
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#include <linux/uaccess.h> |
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#include "pci.h" |
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SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn, |
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unsigned long, off, unsigned long, len, void __user *, buf) |
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{ |
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struct pci_dev *dev; |
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u8 byte; |
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u16 word; |
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u32 dword; |
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int err, cfg_ret; |
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err = -EPERM; |
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dev = NULL; |
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if (!capable(CAP_SYS_ADMIN)) |
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goto error; |
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err = -ENODEV; |
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dev = pci_get_domain_bus_and_slot(0, bus, dfn); |
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if (!dev) |
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goto error; |
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switch (len) { |
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case 1: |
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cfg_ret = pci_user_read_config_byte(dev, off, &byte); |
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break; |
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case 2: |
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cfg_ret = pci_user_read_config_word(dev, off, &word); |
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break; |
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case 4: |
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cfg_ret = pci_user_read_config_dword(dev, off, &dword); |
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break; |
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default: |
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err = -EINVAL; |
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goto error; |
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} |
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err = -EIO; |
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if (cfg_ret) |
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goto error; |
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switch (len) { |
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case 1: |
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err = put_user(byte, (unsigned char __user *)buf); |
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break; |
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case 2: |
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err = put_user(word, (unsigned short __user *)buf); |
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break; |
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case 4: |
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err = put_user(dword, (unsigned int __user *)buf); |
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break; |
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} |
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pci_dev_put(dev); |
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return err; |
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error: |
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/* ??? XFree86 doesn't even check the return value. They |
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just look for 0xffffffff in the output, since that's what |
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they get instead of a machine check on x86. */ |
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switch (len) { |
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case 1: |
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put_user(-1, (unsigned char __user *)buf); |
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break; |
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case 2: |
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put_user(-1, (unsigned short __user *)buf); |
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break; |
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case 4: |
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put_user(-1, (unsigned int __user *)buf); |
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break; |
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} |
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pci_dev_put(dev); |
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return err; |
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} |
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SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn, |
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unsigned long, off, unsigned long, len, void __user *, buf) |
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{ |
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struct pci_dev *dev; |
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u8 byte; |
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u16 word; |
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u32 dword; |
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int err = 0; |
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if (!capable(CAP_SYS_ADMIN) || |
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security_locked_down(LOCKDOWN_PCI_ACCESS)) |
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return -EPERM; |
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dev = pci_get_domain_bus_and_slot(0, bus, dfn); |
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if (!dev) |
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return -ENODEV; |
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switch (len) { |
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case 1: |
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err = get_user(byte, (u8 __user *)buf); |
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if (err) |
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break; |
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err = pci_user_write_config_byte(dev, off, byte); |
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if (err) |
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err = -EIO; |
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break; |
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case 2: |
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err = get_user(word, (u16 __user *)buf); |
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if (err) |
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break; |
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err = pci_user_write_config_word(dev, off, word); |
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if (err) |
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err = -EIO; |
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break; |
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case 4: |
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err = get_user(dword, (u32 __user *)buf); |
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if (err) |
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break; |
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err = pci_user_write_config_dword(dev, off, dword); |
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if (err) |
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err = -EIO; |
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break; |
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default: |
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err = -EINVAL; |
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break; |
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} |
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pci_dev_put(dev); |
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return err; |
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}
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