FYI: Boiled it down to a simple ioctl() call.
===== Start code =====
/* Read an ioctl value */
#include <stdio.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <xf86drm.h>
#include <i915_drm.h>
int main(void) {
int eu_total;
drm_i915_getparam_t gp;
gp.value = &eu_total;
gp.param = I915_PARAM_EU_TOTAL;
int dru = open("/dev/dri/renderD128", O_RDONLY);
if (dru < 0) {
perror("open renderD128");
return errno;
}
int ret = ioctl(dru, DRM_IOCTL_I915_GETPARAM, &gp);
if (ret < 0) {
perror("ioctl");
return errno;
}
printf("Got value: %d\n", eu_total);
return 0;
}
===== End code =====
Compiled with:
gcc -I /usr/include/drm gmltest.c -o gmltest
(needed the extra -I to get drm.h found by xf86drm.h, which is probably a bug,
but I'll ignore that...)
This then reports:
>> root@nuc:/local/users/gml4410/homework# ./gmltest
>> Got value: 24
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https://bugs.launchpad.net/bugs/1800752
Title:
Performance degraded in Cosmic
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