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PCIOCGETCONF Test
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jfree
Aug 31 2025, 4:56 PM
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PCIOCGETCONF Test
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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 NIKSUN, Inc.
*
* Written by Jake Freeland <jfreeland@niksun.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/pciio.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#define PCI_CHARDEV "/dev/pci"
#define PCI_VENDOR_INTEL 0x8086
/* Find all intel devices on the PCI bus and report info about them. */
int
main(void) {
struct pci_conf_io pcio = { };
struct pci_conf devs[16];
struct pci_match_conf pmc;
int pcifd;
pcifd = open(PCI_CHARDEV, O_RDWR);
if (pcifd < 0)
err(1, "Failed to open " PCI_CHARDEV);
pmc.pc_vendor = 0x8086; /* Intel */
pmc.flags = PCI_GETCONF_MATCH_VENDOR;
pcio.pat_buf_len = sizeof(pmc);
pcio.num_patterns = 1;
pcio.patterns = &pmc;
pcio.match_buf_len = sizeof(devs);
pcio.matches = devs;
restart:
pcio.offset = 0;
pcio.generation = 0;
do {
if (ioctl(pcifd, PCIOCGETCONF, &pcio) < 0)
err(1, "PCIOCGETCONF ioctl failed");
if (pcio.status == PCI_GETCONF_LIST_CHANGED)
goto restart;
else if (pcio.status == PCI_GETCONF_ERROR)
errx(1, "PCI_GETCONF_ERROR detected");
for (int i = 0; i < pcio.num_matches; ++i) {
struct pci_conf *dev = devs + i;
printf("--- Device %d ---\n", i);
printf("DBDF: %u:%u:%u.%u\n", dev->pc_sel.pc_domain,
dev->pc_sel.pc_bus, dev->pc_sel.pc_dev,
dev->pc_sel.pc_func);
printf("header type: %u\n", dev->pc_hdr);
printf("subvendor: %u\n", dev->pc_subvendor);
printf("subdevice: %u\n", dev->pc_subdevice);
printf("vendor: %u\n", dev->pc_vendor);
printf("device: %u\n", dev->pc_device);
printf("class: %u\n", dev->pc_class);
printf("subclass: %u\n", dev->pc_subclass);
printf("progif: %u\n", dev->pc_progif);
printf("revid: %u\n", dev->pc_revid);
printf("driver: %s\n", dev->pd_name);
printf("unit: %lu\n", dev->pd_unit);
#if __FreeBSD_version >= 1500063
printf("NUMA node: %d\n", dev->pd_numa_domain);
printf("Reported length: %lu\n", dev->pc_reported_len);
assert(dev->pc_reported_len == offsetof(struct pci_conf, pc_spare));
#endif
}
} while (pcio.status == PCI_GETCONF_MORE_DEVS);
return 0;
}

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