pan/perf: Reject panthor kernel driver

Make sure we reject perfcnt users when the kernel driver is not panfrost.
We might decide to abstract perf counters at the kmod level at some
point, but we're not there yet.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Antonino Maniscalco <antonino.maniscalco@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26358>

src/panfrost/perf/pan_perf.c

@@ -72,6 +72,13 @@ panfrost_lookup_counters(const char *name)
 void
 panfrost_perf_init(struct panfrost_perf *perf, int fd)
 {
+   ASSERTED drmVersionPtr version = drmGetVersion(fd);
+
+   /* We only support panfrost at the moment. */
+   assert(version && !strcmp(version->name, "panfrost"));
+
+   drmFreeVersion(version);
+
    perf->dev = pan_kmod_dev_create(fd, 0, NULL);
    assert(perf->dev);