NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON

PCICONFIG_READ(2)         Linux Programmer's Manual        PCICONFIG_READ(2)

NAME         top

       pciconfig_read, pciconfig_write, pciconfig_iobase - pci device inforā€
       mation handling

SYNOPSIS         top

       #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         top

       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 user space.

       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         top

       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         top

       EINVAL len value is invalid.  This does not apply to
              pciconfig_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 valid only 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         top

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

SEE ALSO         top

       capabilities(7)

COLOPHON         top

       This page is part of release 4.08 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

Linux                            2016-07-17                PCICONFIG_READ(2)