Mesa (main): intel/stub: Implement DRM_I915_QUERY_ENGINE_INFO

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Module: Mesa
Branch: main
Commit: 4c429b6be6c895981a609be273175ba547616775
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4c429b6be6c895981a609be273175ba547616775

Author: Ian Romanick <ian.d.romanick at intel.com>
Date:   Mon Dec  6 12:37:42 2021 -0800

intel/stub: Implement DRM_I915_QUERY_ENGINE_INFO

Borrowed from sim-drm.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14132>

---

 src/intel/tools/intel_noop_drm_shim.c | 42 +++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/src/intel/tools/intel_noop_drm_shim.c b/src/intel/tools/intel_noop_drm_shim.c
index 1174f50555b..ec237cb23e2 100644
--- a/src/intel/tools/intel_noop_drm_shim.c
+++ b/src/intel/tools/intel_noop_drm_shim.c
@@ -303,6 +303,48 @@ i915_ioctl_query(int fd, unsigned long request, void *arg)
          break;
       }
 
+      case DRM_I915_QUERY_ENGINE_INFO: {
+         uint32_t num_copy = 1;
+         uint32_t num_render = 1;
+         uint32_t num_engines = num_copy + num_render;
+
+         struct drm_i915_query_engine_info *info =
+            (struct drm_i915_query_engine_info*)(uintptr_t)item->data_ptr;
+
+         int32_t data_length =
+            sizeof(*info) +
+               num_engines * sizeof(info->engines[0]);
+
+         if (item->length == 0) {
+            item->length = data_length;
+            return 0;
+         } else if (item->length < data_length) {
+            item->length = -EINVAL;
+            return -1;
+         } else {
+            memset(info, 0, data_length);
+
+            for (uint32_t e = 0; e < num_render; e++, info->num_engines++) {
+               info->engines[info->num_engines].engine.engine_class =
+                  I915_ENGINE_CLASS_RENDER;
+               info->engines[info->num_engines].engine.engine_instance = e;
+            }
+
+            for (uint32_t e = 0; e < num_copy; e++, info->num_engines++) {
+               info->engines[info->num_engines].engine.engine_class =
+                  I915_ENGINE_CLASS_COPY;
+               info->engines[info->num_engines].engine.engine_instance = e;
+            }
+
+            assert(info->num_engines == num_engines);
+
+            if (item->length > data_length)
+               item->length = data_length;
+
+            return 0;
+         }
+      }
+
       case DRM_I915_QUERY_PERF_CONFIG:
          /* This is known but not supported by the shim.  Handling this here
           * suppresses some spurious warning messages in shader-db runs.