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I'm trying to develope a pci driver but I can not compile it because my pci header is quite different from books and references. My distribution is 3.15.7-1-ARCH.

http://lxr.free-electrons.com/source/include/linux/pci.h

When the reference's pci.h looks complete, I can not understand why my laptop's header is just below:

/*
 *  pci.h
 *
 *  PCI defines and function prototypes
 *  Copyright 1994, Drew Eckhardt
 *  Copyright 1997--1999 Martin Mares <mj@ucw.cz>
 *
 *  For more information, please consult the following manuals (look at
 *  http://www.pcisig.com/ for how to get them):
 *
 *  PCI BIOS Specification
 *  PCI Local Bus Specification
 *  PCI to PCI Bridge Specification
 *  PCI System Design Guide
 */

#ifndef LINUX_PCI_H
#define LINUX_PCI_H

#include <linux/pci_regs.h> /* The pci register defines */

/*
 * The PCI interface treats multi-function devices as independent
 * devices.  The slot/function address of each device is encoded
 * in a single byte as follows:
 *
 *  7:3 = slot
 *  2:0 = function
 */
#define PCI_DEVFN(slot, func)   ((((slot) & 0x1f) << 3) | ((func) & 0x07))
#define PCI_SLOT(devfn)     (((devfn) >> 3) & 0x1f)
#define PCI_FUNC(devfn)     ((devfn) & 0x07)

/* Ioctls for /proc/bus/pci/X/Y nodes. */
#define PCIIOC_BASE     ('P' << 24 | 'C' << 16 | 'I' << 8)
#define PCIIOC_CONTROLLER   (PCIIOC_BASE | 0x00)    /* Get controller for PCI device. */
#define PCIIOC_MMAP_IS_IO   (PCIIOC_BASE | 0x01)    /* Set mmap state to I/O space. */
#define PCIIOC_MMAP_IS_MEM  (PCIIOC_BASE | 0x02)    /* Set mmap state to MEM space. */
#define PCIIOC_WRITE_COMBINE    (PCIIOC_BASE | 0x03)    /* Enable/disable write-combining. */

#endif /* LINUX_PCI_H */
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1 Answer 1

up vote 1 down vote accepted

The free-electrons header is internal to the kernel source, and you will find it if you look in [src]/include/linux; if you are compiling kernel code, that should be in play.

The header you've pasted is the system header, from /usr/include/linux. That's for user land code that needs access to the constants and macros defined therein.

These don't actually conflict. Notice at the top of the longer, kernel internal one:

#include <uapi/linux/pci.h>

That path doesn't exist in the normal system include directories, but it does exist in [src]/include, and if you check there for this file, you'll notice it's pretty much identical to your system's /usr/include/linux/pci.h. That's how kernel code can access the same values, plus all the stuff it needs internally, since the usual linux/pci.h will have been overridden by something like -I[src]/include, but kernel code which contains #include <linux/pci.h> will pull in [src]/include/linux/pci.h which pulls in [src]/include/uapi/pci.h which is identical to /usr/include/linux/pci.h.

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