anv: Gather engine info from i915 if available

v2 (Jason Ekstrand):
 - Don't take an anv_physical_device in anv_gem_get_engine_info()
 - Return the engine info from anv_gem_get_engine_info()
 - Free the engine info in anv_physical_device_destroy()

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8667>

src/intel/vulkan/anv_device.c

@@ -563,11 +563,12 @@ anv_physical_device_try_create(struct anv_instance *instance,
    }
    device->master_fd = master_fd;
 
+   device->engine_info = anv_gem_get_engine_info(fd);
    anv_physical_device_init_queue_families(device);
 
    result = anv_init_wsi(device);
    if (result != VK_SUCCESS)
-      goto fail_disk_cache;
+      goto fail_engine_info;
 
    device->perf = anv_get_perf(&device->info, fd);
 
@@ -581,7 +582,8 @@ anv_physical_device_try_create(struct anv_instance *instance,
 
    return VK_SUCCESS;
 
-fail_disk_cache:
+fail_engine_info:
+   free(device->engine_info);
    anv_physical_device_free_disk_cache(device);
 fail_compiler:
    ralloc_free(device->compiler);
@@ -598,6 +600,7 @@ static void
 anv_physical_device_destroy(struct anv_physical_device *device)
 {
    anv_finish_wsi(device);
+   free(device->engine_info);
    anv_physical_device_free_disk_cache(device);
    ralloc_free(device->compiler);
    ralloc_free(device->perf);

src/intel/vulkan/anv_gem.c

@@ -681,3 +681,25 @@ anv_i915_query(int fd, uint64_t query_id, void *buffer,
    *buffer_len = item.length;
    return ret;
 }
+
+struct drm_i915_query_engine_info *
+anv_gem_get_engine_info(int fd)
+{
+   int32_t length = 0;
+   int ret = anv_i915_query(fd, DRM_I915_QUERY_ENGINE_INFO, NULL, &length);
+   assert(ret == 0);
+
+   if (ret == -1 && errno == EINVAL)
+      return NULL;
+
+   struct drm_i915_query_engine_info *info = calloc(1, length);
+   ret = anv_i915_query(fd, DRM_I915_QUERY_ENGINE_INFO, info, &length);
+   assert(ret == 0);
+
+   if (ret != 0) {
+      free(info);
+      return NULL;
+   }
+
+   return info;
+}

src/intel/vulkan/anv_gem_stubs.c

@@ -252,6 +252,12 @@ anv_i915_query(int fd, uint64_t query_id, void *buffer,
    unreachable("Unused");
 }
 
+struct drm_i915_query_engine_info *
+anv_gem_get_engine_info(int fd)
+{
+   unreachable("Unused");
+}
+
 int
 anv_gem_syncobj_wait(struct anv_device *device,
                      const uint32_t *handles, uint32_t num_handles,

src/intel/vulkan/anv_private.h

@@ -1162,6 +1162,7 @@ struct anv_physical_device {
     struct wsi_device                       wsi_device;
     int                                         local_fd;
     int                                         master_fd;
+    struct drm_i915_query_engine_info *         engine_info;
 };
 
 struct anv_app_info {
@@ -1662,6 +1663,7 @@ int anv_gem_syncobj_timeline_query(struct anv_device *device,
                                    uint32_t num_items);
 int anv_i915_query(int fd, uint64_t query_id, void *buffer,
                    int32_t *buffer_len);
+struct drm_i915_query_engine_info *anv_gem_get_engine_info(int fd);
 
 uint64_t anv_vma_alloc(struct anv_device *device,
                        uint64_t size, uint64_t align,