pciconfig_read(2)

NAME

pciconfig_read, pciconfig_write, pciconfig_iobase - pci device information handling

SYNOPSIS

#include <pci.h>
int pciconfig_read(unsigned long bus, unsigned long dfn,
          unsigned long off, unsigned long len, void *buf);
int pciconfig_write(unsigned long bus, unsigned long dfn,
          unsigned long off, unsigned long len, void *buf);
int pciconfig_iobase(long which, unsigned long bus,
          unsigned long devfn);

DESCRIPTION

Most of the interaction with PCI devices is already handled by the kernel PCI layer, and thus these calls should not normally need to be accessed from userspace.

pciconfig_read()
Reads to buf from device dev at offset off value.
pciconfig_write()
Writes from buf to device dev at offset off value.
pciconfig_iobase()
You pass it a bus/devfn pair and get a physical address for either the memory offset (for things like prep, this is 0xc0000000), the IO base for PIO cycles, or the ISA holes if any.

RETURN VALUE

pciconfig_read()
On success zero is returned. On error, -1 is returned and errno is set appropriately.
pciconfig_write()
On success zero is returned. On error, -1 is returned and errno is set appropriately.
pciconfig_iobase()
Returns information on locations of various I/O regions in physical memory according to the which value. Values for which are: IOBASE_BRIDGE_NUMBER, IOBASE_MEMORY, IOBASE_IO, IOBASE_ISA_IO, IOBASE_ISA_MEM.

ERRORS

EINVAL len value is invalid. This does not apply to pcicon
fig_iobase().
EIO I/O error.
ENODEV For pciconfig_iobase(), "hose" value is NULL. For the other
calls, could not find a slot.
ENOSYS The system has not implemented these calls (CONFIG_PCI not
defined).
EOPNOTSUPP
This return value is only valid for pciconfig_iobase(). It is returned if the value for which is invalid.
EPERM User does not have the CAP_SYS_ADMIN capability. This does not
apply to pciconfig_iobase().

CONFORMING TO

These calls are Linux-specific, available since Linux 2.0.26/2.1.11.

SEE ALSO

capabilities(7)

COLOPHON

This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
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