cpukit/libpci/pci_for_each_child.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*  PCI Help function, iterate all PCI device children of PCI bus.
0004  *
0005  *  COPYRIGHT (c) 2010 Cobham Gaisler AB.
0006  *
0007  * Redistribution and use in source and binary forms, with or without
0008  * modification, are permitted provided that the following conditions
0009  * are met:
0010  * 1. Redistributions of source code must retain the above copyright
0011  *    notice, this list of conditions and the following disclaimer.
0012  * 2. Redistributions in binary form must reproduce the above copyright
0013  *    notice, this list of conditions and the following disclaimer in the
0014  *    documentation and/or other materials provided with the distribution.
0015  *
0016  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0017  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0018  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0019  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0020  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0021  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0022  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0023  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0024  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0025  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0026  * POSSIBILITY OF SUCH DAMAGE.
0027  */
0028
0029 #include <pci/cfg.h>
0030
0031 /* Iterate over all PCI devices on a bus (not child buses) and call func(),
0032  * iteration is stopped if a non-zero value is returned by func().
0033  *
0034  * search options: 0 (no child buses), 1 (depth first), 2 (breadth first)
0035  */
0036 int pci_for_each_child(
0037     struct pci_bus *bus,
0038     int (*func)(struct pci_dev *, void *arg),
0039     void *arg,
0040     int search)
0041 {
0042     struct pci_dev *dev = bus->devs;
0043     int ret;
0044
0045     while (dev) {
0046         ret = func(dev, arg);
0047         if (ret)
0048             return ret;
0049         if (search == SEARCH_DEPTH && (dev->flags & PCI_DEV_BRIDGE)) {
0050             ret = pci_for_each_child((struct pci_bus *)dev,
0051                             func, arg, search);
0052             if (ret)
0053                 return ret;
0054         }
0055         dev = dev->next;
0056     }
0057
0058     return 0;
0059 }