intel: Fix support of kernel versions without DRM_I915_QUERY_ENGINE_INFO

As Matt Turner pointed out, the commit here fixed breaks in Iris and
ANV in kernel versions without support for DRM_I915_QUERY_ENGINE_INFO.
As compute engines are only present in gfx12 and newer, and support
for DRM_I915_QUERY_ENGINE_INFO was added before any gfx12 platform,
we can check for gfx version before trying to get engine info.

For ANV, this is done by checking if engine_info is not NULL, like in
other places in the ANV source code.

Fixes: a364f23 ("intel: Make gen12 URB space reservation dependent on compute engine presence")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/9099
Signed-off-by: José Roberto de Souza <[email protected]>
Tested-by: Matt Turner <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Marcin Ślusarz <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23257>
(cherry picked from commit 42f707e)

Author: zehortigoza

.pick_status.json

@@ -229,7 +229,7 @@
         "description": "intel: Fix support of kernel versions without DRM_I915_QUERY_ENGINE_INFO",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "a364f23a6cfa28e1843ef1e64dce56b4cef5a71e"
     },

src/gallium/drivers/iris/iris_bufmgr.c

@@ -2240,9 +2240,8 @@ iris_bufmgr_create(struct intel_device_info *devinfo, int fd, bool bo_reuse)
 
    struct intel_query_engine_info *engine_info;
    engine_info = intel_engine_get_info(bufmgr->fd, bufmgr->devinfo.kmd_type);
-   if (!engine_info)
-      goto error_engine_info;
-   bufmgr->devinfo.has_compute_engine = intel_engines_count(engine_info,
+   bufmgr->devinfo.has_compute_engine = engine_info &&
+                                        intel_engines_count(engine_info,
                                                             INTEL_ENGINE_CLASS_COMPUTE);
    free(engine_info);
 
@@ -2338,7 +2337,6 @@ iris_bufmgr_create(struct intel_device_info *devinfo, int fd, bool bo_reuse)
    }
    iris_bufmgr_destroy_global_vm(bufmgr);
 error_init_vm:
-error_engine_info:
    close(bufmgr->fd);
 error_dup:
    free(bufmgr);

src/intel/vulkan/anv_device.c

@@ -995,7 +995,8 @@ anv_physical_device_try_create(struct vk_instance *vk_instance,
    device->master_fd = master_fd;
 
    device->engine_info = intel_engine_get_info(fd, device->info.kmd_type);
-   device->info.has_compute_engine = intel_engines_count(device->engine_info,
+   device->info.has_compute_engine = device->engine_info &&
+                                     intel_engines_count(device->engine_info,
                                                          INTEL_ENGINE_CLASS_COMPUTE);
    anv_physical_device_init_queue_families(device);