mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 16:53:54 +08:00
405f55712d
* 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>
137 lines
2.6 KiB
C
137 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;
|
|
}
|