drm: Implement drmCheckModesettingSupported() for FreeBSD

Add the missing implementation of drmCheckModesettingSupported()
to detect KMS support on FreeBSD (and GNU/kFreeBSD).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72847
Signed-off-by: Konstantin Belousov <kib@freebsd.org>
Signed-off-by: Robert Millan <rmh@freebsd.org>

diff --git a/configure.ac b/configure.ac
index 969fb83..d2d19d6 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -185,6 +185,8 @@ AC_CANONICAL_HOST
 if test "x$LIBKMS" = xauto ; then
        case $host_os in
                linux*)         LIBKMS="yes" ;;
+               freebsd* | kfreebsd*-gnu)
+                               LIBKMS="yes" ;;
                *)              LIBKMS="no" ;;
        esac
 fi

diff --git a/xf86drmMode.c b/xf86drmMode.c
index dd7966e..a6bb2ee 100644 (file)
--- a/xf86drmMode.c
+++ b/xf86drmMode.c
@@ -723,7 +723,7 @@ int drmModeConnectorSetProperty(int fd, uint32_t connector_id, uint32_t property
 */
 int drmCheckModesettingSupported(const char *busid)
 {
-#ifdef __linux__
+#if defined (__linux__)
        char pci_dev_dir[1024];
        int domain, bus, dev, func;
        DIR *sysdir;
@@ -773,6 +773,39 @@ int drmCheckModesettingSupported(const char *busid)
        closedir(sysdir);
        if (found)
                return 0;
+#elif defined (__FreeBSD__) || defined (__FreeBSD_kernel__)
+       char kbusid[1024], sbusid[1024];
+       char oid[128];
+       int domain, bus, dev, func;
+       int i, modesetting, ret;
+       size_t len;
+
+       ret = sscanf(busid, "pci:%04x:%02x:%02x.%d", &domain, &bus, &dev,
+           &func);
+       if (ret != 4)
+               return -EINVAL;
+       snprintf(kbusid, sizeof(kbusid), "pci:%04x:%02x:%02x.%d", domain, bus,
+           dev, func);
+
+       /* How many GPUs do we expect in the machine ? */
+       for (i = 0; i < 16; i++) {
+               snprintf(oid, sizeof(oid), "hw.dri.%d.busid", i);
+               len = sizeof(sbusid);
+               ret = sysctlbyname(oid, sbusid, &len, NULL, 0);
+               if (ret == -1) {
+                       if (errno == ENOENT)
+                               continue;
+                       return -EINVAL;
+               }
+               if (strcmp(sbusid, kbusid) != 0)
+                       continue;
+               snprintf(oid, sizeof(oid), "hw.dri.%d.modesetting", i);
+               len = sizeof(modesetting);
+               ret = sysctlbyname(oid, &modesetting, &len, NULL, 0);
+               if (ret == -1 || len != sizeof(modesetting))
+                       return -EINVAL;
+               return (modesetting ? 0 : -ENOSYS);
+       }
 #endif
        return -ENOSYS;