intel/perf: report whether the platform supported

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2775>

src/intel/perf/gen_perf.c

@@ -662,6 +662,8 @@ load_oa_metrics(struct gen_perf_config *perf, int fd,
       }
    }
 
+   perf->platform_supported = oa_register != NULL;
+
    if (!i915_perf_oa_available ||
        !oa_register ||
        !get_sysfs_dev_dir(perf, fd) ||

src/intel/perf/gen_perf.h

@@ -25,6 +25,7 @@
 #define GEN_PERF_H
 
 #include <stdio.h>
+#include <stdbool.h>
 #include <stdint.h>
 #include <string.h>
 
@@ -267,6 +268,12 @@ struct gen_perf_config {
     */
    struct hash_table *oa_metrics_table;
 
+   /* Whether we have support for this platform. If true && n_queries == 0,
+    * this means we will not be able to use i915-perf because of it is in
+    * paranoid mode.
+    */
+   bool platform_supported;
+
    /* Location of the device's sysfs entry. */
    char sysfs_dev_dir[256];