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pkg/51795: x11/libdrm update xf86drm.c for mesa 13.0.2 needs negotiation
>Number: 51795
>Category: pkg
>Synopsis: x11/libdrm update xf86drm.c for mesa 13.0.2 needs negotiation
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: pkg-manager
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sun Jan 08 05:50:00 +0000 2017
>Originator: David Shao
>Release: current pkgsrc
>Organization:
>Environment:
DragonFly 4.7-DEVELOPMENT DragonFly v4.7.0.1108.g10127-DEVELOPMENT #3: Sat Jan 7 12:15:22 PST 2017 xxxxxx@:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64
>Description:
The following patch to xf86drm.c for x11/libdrm for the update to mesa
13.0.2 is an example of the chaos that will inevitably result unless the
BSDs and possibly others can hammer out a uniform solution.
mesa 13.0.2 is switching to using libdrm for some hardware detection. In particular libdrm is given a file descriptor fd, probably that from
/dev/dri/card0 or its equivalent, and asks that a struct be filled out
with PCI bus and card information. So for the PCI bus information,
domain, bus, slot, function. For the PCI card information, device,
vendor, subdevice, subvendor, and revision. The kernel has this
information.
There are two natural approaches in BSD land for the kernel to pass
this information to userland: an ioctl on fd or through sysctls.
There are working implementations using both approaches: OpenBSD
has chosen to reassign an existing ioctl number 0x15 for a new
ioctl to pass the information, while on the FreeBSD x11 mailing
list a pointer has been posted to using an updated version of libdevq,
libdev 0.0.4, which in effect reads existing sysctls.
But although the changes to libdrm are restricted to only one file,
xf86drm.c, maintenance will probably be ... unpleasant. Just for
three OSes, NetBSD, FreeBSD, and DragonFly, the following considerations
have to be made:
1) I have proposed a direct copy of OpenBSD's added ioctl as a NetBSD
kernel bug report:
kern/51786: mesa 13.0.2 libdrm 2.4.74 Radeon needs kernel support, new ioctl or sysctl
I wonder if some sort of versioning logic will need to be added.
2) FreeBSD has an extra /dev/dri/control64D device that needs to
basically be ignored in favor of /dev/dri/card0.
3) DragonFly does not seem to have completely consistent major numbers.
I added in some logic that I am not sure will work.
The sysctls for FreeBSD and DragonFly are also messy to deal with.
The information is spread over two different subtrees.
Depending on one's video hardware, this problem might be ignorable for
some time. Intel integrated graphics, as least for an IvyBridge model,
does not seem to exercise this code. However using a Radeon graphics
card, CAICOS generation Sapphire HD6450, I observed not even 2D exa
acceleration would work without this patch.
>How-To-Repeat:
>Fix:
diff -Nur x11/libdrm.orig/distinfo x11/libdrm/distinfo
--- x11/libdrm.orig/distinfo 2016-11-30 04:37:40.000000000 -0800
+++ x11/libdrm/distinfo 2017-01-07 20:44:42.503930000 -0800
@@ -4,7 +4,7 @@
RMD160 (libdrm-2.4.74.tar.bz2) = 8ebc6e850ab576928c011f7b2d1e67fc42d37209
SHA512 (libdrm-2.4.74.tar.bz2) = 5b9784bf00bb8179ad59f2fbe5600b51ede3f79dd1ea2cb50485ffaabf74e83d766b2deb6833b99692a303e6780286ecce41b88a2d7c15f9e839bc7182a8879d
Size (libdrm-2.4.74.tar.bz2) = 781730 bytes
-SHA1 (patch-ab) = ebc345d7f1aeb583b3ebb883fb3b27abc5b8133c
+SHA1 (patch-ab) = 995255ce1933c7a3fb3b291973d60ec23bc5a430
SHA1 (patch-ac) = 67c998df7dfc0dabc86320ea6d015cede3e464ea
SHA1 (patch-include_drm_drm.h) = 48a912f40bf2b2a1c23edbe4446fa7869212f17b
SHA1 (patch-libkms_vmwgfx.c) = d2204c0b79098c6c36b7f282b486c58c6354bd1d
diff -Nur x11/libdrm.orig/patches/patch-ab x11/libdrm/patches/patch-ab
--- x11/libdrm.orig/patches/patch-ab 2015-08-14 10:12:35.000000000 -0700
+++ x11/libdrm/patches/patch-ab 2017-01-07 13:39:39.000000000 -0800
@@ -1,13 +1,616 @@
-$NetBSD: patch-ab,v 1.8 2015/08/14 17:12:35 wiz Exp $
+$NetBSD$
---- xf86drm.c.orig 2015-08-13 22:27:03.000000000 +0000
+--- xf86drm.c.orig 2016-11-29 11:15:10.000000000 +0000
+++ xf86drm.c
-@@ -79,7 +79,7 @@
+@@ -31,6 +31,36 @@
+ * DEALINGS IN THE SOFTWARE.
+ */
+
++/* Port for FreeBSD and DragonFly uses code from libdevq 0.0.4
++ * https://github.com/freebsd/libdevq
++ * with copyright notice:
++ *
++ * Copyright (c) 2014 Jean-Sebastien Pedron <dumbbell%FreeBSD.org@localhost>
++ * Copyright (c) 2016 Koop Mast <kwm%FreeBSD.org@localhost>
++ * All rights reserved.
++ *
++ * 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
++ * in this position and unchanged.
++ * 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(S) ``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(S) 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.
++ */
++
+ #ifdef HAVE_CONFIG_H
+ # include <config.h>
+ #endif
+@@ -72,6 +102,10 @@
+
+ #include "util_math.h"
+
++#if defined(__FreeBSD__) || defined(__DragonFly__)
++#include <sys/sysctl.h>
++#endif
++
+ #ifdef __OpenBSD__
+ #define DRM_PRIMARY_MINOR_NAME "drm"
+ #define DRM_CONTROL_MINOR_NAME "drmC"
+@@ -82,12 +116,22 @@
+ #define DRM_RENDER_MINOR_NAME "renderD"
+ #endif
+
+-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
+-#define DRM_MAJOR 145
++#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
++#define DRM_MAJOR 0
++#endif
++
++#if defined(__DragonFly__)
++/* DragonFly's devfs dynamically allocates major numbers.
++ * Sometimes the majors do not match,
++ * so keep track of the first major seen.
++ */
++#define DRM_MAJOR 64
++static int maj_firstseen = -1;
#endif
#ifdef __NetBSD__
-#define DRM_MAJOR 34
++#undef DRM_MAJOR
+#define DRM_MAJOR 180
#endif
#ifdef __OpenBSD__
+@@ -102,6 +146,23 @@
+ #define DRM_MAJOR 226 /* Linux */
+ #endif
+
++#if defined(__NetBSD__)
++/* From OpenBSD xenocara/lib/libdrm/xf86drm.c */
++struct drm_pciinfo {
++ uint16_t domain;
++ uint8_t bus;
++ uint8_t dev;
++ uint8_t func;
++ uint16_t vendor_id;
++ uint16_t device_id;
++ uint16_t subvendor_id;
++ uint16_t subdevice_id;
++ uint8_t revision_id;
++};
++
++#define DRM_IOCTL_GET_PCIINFO DRM_IOR(0x0f, struct drm_pciinfo)
++#endif
++
+ #define DRM_MSG_VERBOSITY 3
+
+ #define memclear(s) memset(&s, 0, sizeof(s))
+@@ -532,6 +593,7 @@ static int drmGetMinorType(int minor)
+ }
+ }
+
++#if !defined(__FreeBSD__) && !defined(__DragonFly__) && !defined(__NetBSD__)
+ static const char *drmGetMinorName(int type)
+ {
+ switch (type) {
+@@ -545,6 +607,7 @@ static const char *drmGetMinorName(int t
+ return NULL;
+ }
+ }
++#endif
+
+ /**
+ * Open the device by bus ID.
+@@ -2718,7 +2781,11 @@ int drmGetNodeTypeFromFd(int fd)
+ maj = major(sbuf.st_rdev);
+ min = minor(sbuf.st_rdev);
+
++#if defined(__DragonFly__)
++ if (((maj != DRM_MAJOR) && (maj != maj_firstseen)) || (maj < 0) || !S_ISCHR(sbuf.st_mode)) {
++#else
+ if (maj != DRM_MAJOR || !S_ISCHR(sbuf.st_mode)) {
++#endif
+ errno = EINVAL;
+ return -1;
+ }
+@@ -2817,6 +2884,15 @@ static char *drmGetMinorNameForFD(int fd
+
+ out_close_dir:
+ closedir(sysdir);
++#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
++ struct stat buf;
++ char name[64];
++
++ fstat(fd, &buf);
++ snprintf(name, sizeof(name), "/dev/%s",
++ devname(buf.st_rdev, S_IFCHR));
++
++ return strdup(name);
+ #else
+ #warning "Missing implementation of drmGetMinorNameForFD"
+ #endif
+@@ -2854,6 +2930,12 @@ static int drmParseSubsystemType(int maj
+ return DRM_BUS_PCI;
+
+ return -EINVAL;
++#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
++ /* XXX: Don't know how to get the subsystem type, hardcode for now.
++ * The code following the call to this function needs depends on
++ * information provided by the /pci subsystem on linux. No replacement
++ * found yet for FreeBSD. */
++ return DRM_BUS_PCI;
+ #else
+ #warning "Missing implementation of drmParseSubsystemType"
+ return -EINVAL;
+@@ -2896,6 +2978,82 @@ static int drmParsePciBusInfo(int maj, i
+ info->func = func;
+
+ return 0;
++#elif defined(__NetBSD__)
++/* From OpenBSD xenocara/lib/libdrm/xf86drm.c */
++ struct drm_pciinfo pinfo;
++ int fd;
++
++ drmMsg("NetBSD: drmParsePciBusInfo(): Before drmOpenMinor min (%d)\n", min);
++
++ fd = drmOpenMinor(min, 0, DRM_NODE_PRIMARY);
++ if (fd < 0)
++ return -errno;
++
++ drmMsg("Before drmIoctl (0x0f) using fd (%d)\n", fd);
++
++ if (drmIoctl(fd, DRM_IOCTL_GET_PCIINFO, &pinfo)) {
++ close(fd);
++ return -errno;
++ }
++ close(fd);
++
++ info->domain = pinfo.domain;
++ info->bus = pinfo.bus;
++ info->dev = pinfo.dev;
++ info->func = pinfo.func;
++
++ return 0;
++#elif (defined(__FreeBSD__) || defined(__DragonFly__))
++/* Read the hw.dri.$min.busid sysctl
++ * Adapted from function devq_device_get_pcibusaddr(),
++ * project devq version 0.0.4, file src/freebsd/device.c
++ */
++ char sysctl_name[32], sysctl_value[128];
++ const char *busid_format;
++ size_t sysctl_value_len;
++ int domain, bus, dev, func;
++ int ret;
++ snprintf(sysctl_name, 31, "hw.dri.%d.busid", min);
++
++ drmMsg("Reading sysctl_name (%s)\n", sysctl_name);
++
++ busid_format = "pci:%d:%d:%d.%d";
++ sysctl_value_len = sizeof(sysctl_value);
++ memset(sysctl_value, 0, sysctl_value_len);
++ ret = sysctlbyname(sysctl_name, sysctl_value, &sysctl_value_len,
++ NULL, 0);
++ if (ret != 0) {
++ /*
++ * If hw.dri.$n.busid isn't available, fallback on
++ * hw.dri.$n.name.
++ */
++ busid_format = "%*s %*s pci:%d:%d:%d.%d";
++ sysctl_value_len = sizeof(sysctl_value);
++ memset(sysctl_value, 0, sysctl_value_len);
++ sprintf(sysctl_name, "hw.dri.%d.name", dev);
++
++ drmMsg("Reading sysctl_name (%s)\n", sysctl_name);
++
++ ret = sysctlbyname(sysctl_name, sysctl_value, &sysctl_value_len,
++ NULL, 0);
++ }
++
++ if (ret != 0)
++ return (-EINVAL);
++
++ drmMsg("Scanning sysctl_value (%s) using busid_format (%s)\n",
++ sysctl_value, busid_format);
++
++ if (sscanf(sysctl_value, busid_format,
++ &domain, &bus, &dev, &func) != 4)
++ return -EINVAL;
++
++ info->domain = domain;
++ info->bus = bus;
++ info->dev = dev;
++ info->func = func;
++
++ return 0;
+ #else
+ #warning "Missing implementation of drmParsePciBusInfo"
+ return -EINVAL;
+@@ -2946,8 +3104,87 @@ static int drmGetMaxNodeName(void)
+ 3 /* length of the node number */;
+ }
+
++#if defined(__FreeBSD__) || defined(__DragonFly__)
++/* Uses function of name prefixed by devq_
++ * from libdevq 0.0.4, file src/freebsd/device.c
++ */
++static int
++compare_vgapci_busaddr(int i, int *domain, int *bus, int *slot,
++ int *function)
++{
++ int ret;
++ char sysctl_name[32], sysctl_value[128];
++ size_t sysctl_value_len;
++
++ snprintf(sysctl_name, 31, "dev.vgapci.%d.%%location", i);
++
++ drmMsg("Reading sysctl_name (%s)\n", sysctl_name);
++
++ sysctl_value_len = sizeof(sysctl_value);
++ memset(sysctl_value, 0, sysctl_value_len);
++ ret = sysctlbyname(sysctl_name, sysctl_value,
++ &sysctl_value_len, NULL, 0);
++ if (ret != 0)
++ return (-1);
++
++ drmMsg("Read sysctl_value (%s)\n", sysctl_value);
++
++ /*
++ * dev.vgapci.$m.%location can have two formats:
++ * o "pci0:2:0:0 handle=\_SB_.PCI0.PEG3.MXM3" (FreeBSD 11+)
++ * o "slot=1 function=0" (DragonFly or up-to FreeBSD 10)
++ */
++
++ ret = sscanf(sysctl_value, "pci%d:%d:%d:%d %*s",
++ domain, bus, slot, function);
++
++ if (ret == 4)
++ drmMsg("compare_vgapci_busaddr(): domain (%d), bus (%d), slot (%d), function (%d)\n",
++ *domain, *bus, *slot, *function);
++
++ if (ret == 4)
++ return (0);
++
++ ret = sscanf(sysctl_value, "slot=%d function=%d %*s",
++ slot, function);
++ if (ret != 2)
++ return (-1);
++
++ snprintf(sysctl_name, 31, "dev.vgapci.%d.%%parent", i);
++
++ drmMsg("Reading sysctl_name (%s)\n", sysctl_name);
++
++ sysctl_value_len = sizeof(sysctl_value);
++ memset(sysctl_value, 0, sysctl_value_len);
++ ret = sysctlbyname(sysctl_name, sysctl_value,
++ &sysctl_value_len, NULL, 0);
++ if (ret != 0)
++ return (-1);
++
++ drmMsg("Read sysctl_value (%s)\n", sysctl_value);
++
++ ret = sscanf(sysctl_value, "pci%d", bus);
++ if (ret != 1)
++ return (-1);
++
++ /* FIXME: What domain to assume? */
++ *domain = 0;
++
++ drmMsg("compare_vgapci_busaddr(): domain (%d), bus (%d), slot (%d), function (%d)\n",
++ *domain, *bus, *slot, *function);
++
++ return (0);
++}
++#endif
++
++#if !defined(__FreeBSD__) && !defined(__DragonFly__)
+ static int drmParsePciDeviceInfo(const char *d_name,
+ drmPciDeviceInfoPtr device)
++#else
++static int drmParsePciDeviceInfoBSD(const char *d_name,
++ drmPciDeviceInfoPtr device,
++ drmPciBusInfoPtr info)
++#endif
+ {
+ #ifdef __linux__
+ char path[PATH_MAX + 1];
+@@ -2971,6 +3208,112 @@ static int drmParsePciDeviceInfo(const c
+ device->subdevice_id = config[46] | (config[47] << 8);
+
+ return 0;
++#elif defined(__NetBSD__)
++/* From OpenBSD xenocara/lib/libdrm/xf86drm.c */
++ struct drm_pciinfo pinfo;
++ char buf[PATH_MAX + 1];
++ int fd, n;
++
++ n = snprintf(buf, sizeof(buf), "%s/%s", DRM_DIR_NAME, d_name);
++ if (n == -1 || n >= sizeof(buf))
++ return -errno;
++
++ drmMsg("NetBSD: drmParsePciDeviceInfo(): open (%s)\n", buf);
++ fd = open(buf, O_RDWR, 0);
++
++ if (fd < 0)
++ return -errno;
++
++ drmMsg("Before drmIoctl (0x0f) with fd (%d)\n", fd);
++ if (drmIoctl(fd, DRM_IOCTL_GET_PCIINFO, &pinfo)) {
++ close(fd);
++ return -errno;
++ }
++ close(fd);
++
++ device->vendor_id = pinfo.vendor_id;
++ device->device_id = pinfo.device_id;
++ device->revision_id = pinfo.revision_id;
++ device->subvendor_id = pinfo.subvendor_id;
++ device->subdevice_id = pinfo.subdevice_id;
++
++ return 0;
++#elif defined(__FreeBSD__) || defined(__DragonFly__)
++/* Adapted from function devq_device_get_pciid_full_from_fd(),
++ * from libdevq 0.0.4, file src/freebsd/device.c,
++ */
++ unsigned int vendor_id = 0, device_id = 0, subvendor_id = 0,
++ subdevice_id = 0, revision_id = 0;
++ int i, ret;
++ char sysctl_name[32], sysctl_value[128];
++ size_t sysctl_value_len;
++
++/*
++ * Now, look at all dev.vgapci.$m trees until we find the
++ * correct device. We specifically look at:
++ * o dev.vgapci.$m.%location
++ * o dev.vgapci.$m.%parent
++ */
++ for (i = 0; i < DRM_MAX_FDS; ++i) {
++ int tmp_domain, tmp_bus, tmp_slot, tmp_function;
++
++ ret = compare_vgapci_busaddr(i, &tmp_domain, &tmp_bus,
++ &tmp_slot, &tmp_function);
++
++ if (ret == 0 &&
++ tmp_domain == info->domain &&
++ tmp_bus == info->bus &&
++ tmp_slot == info->dev &&
++ tmp_function == info->func)
++ break;
++ }
++
++ if (i == DRM_MAX_FDS) {
++ drmMsg("All DRM_MAX_FDS (%d) vgapci tried!\n", DRM_MAX_FDS);
++ errno = ENOENT;
++ return (-1);
++ }
++
++/*
++ * Ok, we have the right tree. Let's read dev.vgapci.$m.%pnpinfo
++ * to gather the PCI ID.
++ */
++ snprintf(sysctl_name, 31, "dev.vgapci.%d.%%pnpinfo", i);
++
++ drmMsg("Reading sysctl_name (%s)\n", sysctl_name);
++
++ sysctl_value_len = sizeof(sysctl_value);
++ memset(sysctl_value, 0, sysctl_value_len);
++ ret = sysctlbyname(sysctl_name, sysctl_value,
++ &sysctl_value_len, NULL, 0);
++ if (ret != 0)
++ return (-1);
++
++ drmMsg("Read sysctl_value (%s)\n", sysctl_value);
++
++#if defined(__DragonFly__)
++/* DragonFly has a device class field following the subdevice field */
++ ret = sscanf(sysctl_value,
++ "vendor=0x%04x device=0x%04x subvendor=0x%04x subdevice=0x%04x %*s",
++ &vendor_id, &device_id, &subvendor_id, &subdevice_id);
++#else /* FreeBSD */
++ ret = sscanf(sysctl_value,
++ "vendor=0x%04x device=0x%04x subvendor=0x%04x subdevice=0x%04x",
++ &vendor_id, &device_id, &subvendor_id, &subdevice_id);
++#endif
++ if (ret != 4) {
++ errno = EINVAL;
++ return (-1);
++ }
++
++ device->vendor_id = (uint16_t) vendor_id;
++ device->device_id = (uint16_t) device_id;
++ device->subvendor_id = (uint16_t) subvendor_id;
++ device->subdevice_id = (uint16_t) subdevice_id;
++ /* XXX: add code to find out revision id */
++ device->revision_id = (uint8_t) revision_id;
++
++ return 0;
+ #else
+ #warning "Missing implementation of drmParsePciDeviceInfo"
+ return -EINVAL;
+@@ -3006,6 +3349,9 @@ static int drmProcessPciDevice(drmDevice
+ int ret, i;
+ char *addr;
+
++ drmMsg("libdrm, file xf86drm.c, drmProcessPciDevice() called\n");
++ drmMsg(" node (%s), node_type (%d)\n", node, node_type);
++
+ *device = calloc(1, sizeof(drmDevice) +
+ (DRM_NODE_MAX * (sizeof(void *) + max_node_str)) +
+ sizeof(drmPciBusInfo) +
+@@ -3030,19 +3376,41 @@ static int drmProcessPciDevice(drmDevice
+
+ (*device)->businfo.pci = (drmPciBusInfoPtr)addr;
+
++ drmMsg("Before drmParsePciBusInfo(): maj (%d), min (%d)\n", maj, min);
+ ret = drmParsePciBusInfo(maj, min, (*device)->businfo.pci);
++ drmMsg("After drmParsePciBusInfo(): return value (%d)\n", ret);
++
+ if (ret)
+ goto free_device;
+
++ drmMsg("d domain == %04x\n", (*device)->businfo.pci->domain);
++ drmMsg("d bus == %02x\n", (*device)->businfo.pci->bus);
++ drmMsg("d dev == %02x\n", (*device)->businfo.pci->dev);
++ drmMsg("d func == %1u\n", (*device)->businfo.pci->func);
++
+ // Fetch the device info if the user has requested it
+ if (fetch_deviceinfo) {
+ addr += sizeof(drmPciBusInfo);
+ (*device)->deviceinfo.pci = (drmPciDeviceInfoPtr)addr;
+
++ drmMsg("Before drmParsePciDeviceInfo(): d_name (%s)\n", d_name);
++#if defined(__FreeBSD__) || defined(__DragonFly__)
++ ret = drmParsePciDeviceInfoBSD(d_name, (*device)->deviceinfo.pci,
++ (*device)->businfo.pci);
++#else
+ ret = drmParsePciDeviceInfo(d_name, (*device)->deviceinfo.pci);
++#endif
++ drmMsg("After drmParsePciDeviceInfo(): return value (%d)\n", ret);
+ if (ret)
+ goto free_device;
+ }
++
++ drmMsg("d vendor_id == %04x\n", (*device)->deviceinfo.pci->vendor_id);
++ drmMsg("d device_id == %04x\n", (*device)->deviceinfo.pci->device_id);
++ drmMsg("d subvendor_id == %04x\n", (*device)->deviceinfo.pci->subvendor_id);
++ drmMsg("d subdevice_id == %04x\n", (*device)->deviceinfo.pci->subdevice_id);
++ drmMsg("d revision_id == %02x\n", (*device)->deviceinfo.pci->revision_id);
++
+ return 0;
+
+ free_device:
+@@ -3096,6 +3464,8 @@ int drmGetDevice(int fd, drmDevicePtr *d
+ int max_count = 16;
+ dev_t find_rdev;
+
++ drmMsg("libdrm, file xf86drm.c, drmGetDevice(): fd == %d\n", fd);
++
+ if (fd == -1 || device == NULL)
+ return -EINVAL;
+
+@@ -3106,15 +3476,32 @@ int drmGetDevice(int fd, drmDevicePtr *d
+ maj = major(sbuf.st_rdev);
+ min = minor(sbuf.st_rdev);
+
++ drmMsg("DRM_MAJOR == %d, fd maj == %d, min == %d\n", DRM_MAJOR, maj, min);
++
+ if (maj != DRM_MAJOR || !S_ISCHR(sbuf.st_mode))
++#if defined(__DragonFly__)
++ {
++ if ((maj_firstseen < 0) && (maj >= 0) && S_ISCHR(sbuf.st_mode)) {
++ maj_firstseen = maj;
++ drmMsg("First seen maj (%d) != DRM_MAJOR (%d)\n", maj, DRM_MAJOR);
++ }
++ else {
++ return -EINVAL;
++ }
++ }
++#else
+ return -EINVAL;
++#endif
+
+ subsystem_type = drmParseSubsystemType(maj, min);
++ drmMsg("fd subsystem_type == %d\n", subsystem_type);
+
+ local_devices = calloc(max_count, sizeof(drmDevicePtr));
+ if (local_devices == NULL)
+ return -ENOMEM;
+
++ drmMsg("Opening DRM_DIR_NAME (%s)\n", DRM_DIR_NAME);
++
+ sysdir = opendir(DRM_DIR_NAME);
+ if (!sysdir) {
+ ret = -errno;
+@@ -3123,10 +3510,20 @@ int drmGetDevice(int fd, drmDevicePtr *d
+
+ i = 0;
+ while ((dent = readdir(sysdir))) {
++
++ drmMsg("Examining dent->d_name (%s)\n", dent->d_name);
++
+ node_type = drmGetNodeType(dent->d_name);
+ if (node_type < 0)
+ continue;
+
++#if defined(__FreeBSD__)
++/* FreeBSD has /dev/dri/control64D devices which are not relevant */
++ drmMsg("Examining node_type (%d)\n", node_type);
++ if (node_type > 0)
++ continue;
++#endif
++
+ snprintf(node, PATH_MAX, "%s/%s", DRM_DIR_NAME, dent->d_name);
+ if (stat(node, &sbuf))
+ continue;
+@@ -3134,16 +3531,32 @@ int drmGetDevice(int fd, drmDevicePtr *d
+ maj = major(sbuf.st_rdev);
+ min = minor(sbuf.st_rdev);
+
++ drmMsg("Device node (%s) has maj (%d), min (%d)\n", node, maj, min);
++
++#if defined(__DragonFly)
++ if (((maj != DRM_MAJOR) && (maj != maj_firstseen)) || (maj < 0) || !S_ISCHR(sbuf.st_mode))
++#else
+ if (maj != DRM_MAJOR || !S_ISCHR(sbuf.st_mode))
++#endif
+ continue;
+
++ drmMsg(" and subsystem_type (%d) compared to DRM_BUS_PCI (%d)\n",
++ drmParseSubsystemType(maj, min), DRM_BUS_PCI);
+ if (drmParseSubsystemType(maj, min) != subsystem_type)
+ continue;
+
++#if defined (__FreeBSD__) || defined(__DragonFly__)
++/* Use basically 0 from card0 instead of the minor number */
++ if (sscanf(dent->d_name, "card%d", &min) != 1)
++ min = 0;
++#endif
++
+ switch (subsystem_type) {
+ case DRM_BUS_PCI:
++ drmMsg("Before drmProcessPciDevice(): card (%d), node_type (%d)\n", min, node_type);
+ ret = drmProcessPciDevice(&d, dent->d_name, node, node_type,
+ maj, min, true);
++ drmMsg("After drmProcessPciDevice(): return value (%d)\n", ret);
+ if (ret)
+ goto free_devices;
+
+@@ -3234,6 +3647,12 @@ int drmGetDevices(drmDevicePtr devices[]
+ if (node_type < 0)
+ continue;
+
++#if defined(__FreeBSD__)
++/* FreeBSD has /dev/dri/control64D devices which are not relevant */
++ if (node_type > 0)
++ continue;
++#endif
++
+ snprintf(node, PATH_MAX, "%s/%s", DRM_DIR_NAME, dent->d_name);
+ if (stat(node, &sbuf))
+ continue;
+@@ -3241,7 +3660,11 @@ int drmGetDevices(drmDevicePtr devices[]
+ maj = major(sbuf.st_rdev);
+ min = minor(sbuf.st_rdev);
+
++#if defined(__DragonFly__)
++ if (((maj != DRM_MAJOR) && (maj != maj_firstseen)) || (maj < 0) || !S_ISCHR(sbuf.st_mode))
++#else
+ if (maj != DRM_MAJOR || !S_ISCHR(sbuf.st_mode))
++#endif
+ continue;
+
+ subsystem_type = drmParseSubsystemType(maj, min);
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