anv: add support for VK_EXT_nested_command_buffer

Our implementation of secondary command buffers already jumps into
them and edits the end of the secondary command buffer to jump back
into the primary.

That implementation can work just the same with any levels of
secondary. The only possible issue would happen with a secondary
calling itself, but that's not possible.

We also cannot support simultaneous execution with self-modifying
command buffers. That's actually not a problem at the moment because
we don't have multiple queues of the same family but we choose to
reflect that in the feature bits.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25600>

src/intel/vulkan/anv_device.c

@@ -347,6 +347,7 @@ get_device_extensions(const struct anv_physical_device *device,
                                                device->sys.available,
       .EXT_mesh_shader                       = device->info.has_mesh_shading,
       .EXT_mutable_descriptor_type           = true,
+      .EXT_nested_command_buffer             = true,
       .EXT_non_seamless_cube_map             = true,
       .EXT_pci_bus_info                      = true,
       .EXT_physical_device_drm               = true,
@@ -846,6 +847,11 @@ get_features(const struct anv_physical_device *pdevice,
 
       /* VK_KHR_maintenance5 */
       .maintenance5 = true,
+
+      /* VK_EXT_nested_command_buffer */
+      .nestedCommandBuffer = true,
+      .nestedCommandBufferRendering = true,
+      .nestedCommandBufferSimultaneousUse = false,
    };
 
    /* The new DOOM and Wolfenstein games require depthBounds without
@@ -2454,6 +2460,13 @@ void anv_GetPhysicalDeviceProperties2(
          break;
       }
 
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_NESTED_COMMAND_BUFFER_PROPERTIES_EXT: {
+         VkPhysicalDeviceNestedCommandBufferPropertiesEXT *properties =
+            (VkPhysicalDeviceNestedCommandBufferPropertiesEXT *)ext;
+         properties->maxCommandBufferNestingLevel = UINT32_MAX;
+         break;
+      }
+
       case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PERFORMANCE_QUERY_PROPERTIES_KHR: {
          VkPhysicalDevicePerformanceQueryPropertiesKHR *properties =
             (VkPhysicalDevicePerformanceQueryPropertiesKHR *)ext;

src/intel/vulkan/genX_cmd_buffer.c

@@ -3657,8 +3657,6 @@ genX(CmdExecuteCommands)(
 {
    ANV_FROM_HANDLE(anv_cmd_buffer, container, commandBuffer);
 
-   assert(container->vk.level == VK_COMMAND_BUFFER_LEVEL_PRIMARY);
-
    if (anv_batch_has_error(&container->batch))
       return;