linux-stable/drivers/pci/syscall.c
Alexey Dobriyan 405f55712d headers: smp_lock.h redux
* Remove smp_lock.h from files which don't need it (including some headers!)
* Add smp_lock.h to files which do need it
* Make smp_lock.h include conditional in hardirq.h
  It's needed only for one kernel_locked() usage which is under CONFIG_PREEMPT

  This will make hardirq.h inclusion cheaper for every PREEMPT=n config
  (which includes allmodconfig/allyesconfig, BTW)

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-07-12 12:22:34 -07:00

136 lines
2.6 KiB
C

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