freebsd-ports/lang/intel-compute-runtime/files/patch-max_freq

/sys/bus/pci/devices doesn't exist as kms-drm exports sysfs via sysctl

  $ clinfo | fgrep clock
    Max clock frequency                             0MHz

--- shared/source/os_interface/linux/drm_neo.cpp.orig	2020-04-11 07:41:07 UTC
+++ shared/source/os_interface/linux/drm_neo.cpp
@@ -24,6 +24,11 @@
 #include <fstream>
 #include <linux/limits.h>
 
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#endif
+
 namespace NEO {
 
 namespace IoctlHelper {
@@ -104,6 +109,16 @@ int Drm::getEnabledPooledEu(int &enabled) {
 
 int Drm::getMaxGpuFrequency(int &maxGpuFrequency) {
     maxGpuFrequency = 0;
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+    char max_freq[PAGE_SIZE];
+    size_t len = sizeof(max_freq);
+
+    if (sysctlbyname("sys.class.drm.card0.gt_max_freq_mhz", &max_freq, &len, NULL, 0)) {
+        return 0;
+    }
+
+    maxGpuFrequency = std::stoi(max_freq);
+#else
     std::string clockSysFsPath = getSysFsPciPath();
 
     clockSysFsPath += "/gt_max_freq_mhz";
@@ -115,6 +130,7 @@ int Drm::getMaxGpuFrequency(int &maxGpuFrequency) {
 
     ifs >> maxGpuFrequency;
     ifs.close();
+#endif
     return 0;
 }