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PCICONFIG_READ(2)          Linux Programmer's ManualPCICONFIG_READ(2)NAME       pciconfig_read, pciconfig_write, pciconfig_iobase - pci device informa-       tion handlingSYNOPSIS       #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 ker-       nel  PCI layer, and thus these calls should not normally need to be ac-       cessed 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  ei-              ther   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 er-              rno is set appropriately.       pciconfig_write()              On success, zero is returned.  On error, -1 is returned and  er-              rno is set appropriately.       pciconfig_iobase()              Returns information on locations of various I/O regions in phys-              ical 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  de-              fined).       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       These calls are Linux-specific, available since Linux 2.0.26/2.1.11.SEE ALSOcapabilities(7)COLOPHON       This  page  is  part of release 5.05 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                             2016-07-17PCICONFIG_READ(2)