diff --git a/src/vulkan/runtime/vk_image.c b/src/vulkan/runtime/vk_image.c
index 90c5b948c63..d8a8dd52e2d 100644
--- a/src/vulkan/runtime/vk_image.c
+++ b/src/vulkan/runtime/vk_image.c
@@ -284,6 +284,25 @@ vk_image_expand_aspect_mask(const struct vk_image *image,
    }
 }
 
+uint32_t
+vk_image_subresource_slice_count(const struct vk_device *device,
+                                 const struct vk_image *image,
+                                 const VkImageSubresourceLayers *range)
+{
+   assert(image->image_type == VK_IMAGE_TYPE_3D);
+
+   bool layers_are_slices = device->enabled_features.maintenance9 &&
+      (image->create_flags & VK_IMAGE_CREATE_2D_ARRAY_COMPATIBLE_BIT);
+   uint32_t slices = u_minify(image->extent.depth, range->mipLevel);
+
+   if (!layers_are_slices) {
+      assert(range->baseArrayLayer == 0);
+      return slices;
+   }
+   return range->layerCount == VK_REMAINING_ARRAY_LAYERS ?
+          slices - range->baseArrayLayer : range->layerCount;
+}
+
 VkExtent3D
 vk_image_extent_to_elements(const struct vk_image *image, VkExtent3D extent)
 {
diff --git a/src/vulkan/runtime/vk_image.h b/src/vulkan/runtime/vk_image.h
index f9869f19532..d318c283346 100644
--- a/src/vulkan/runtime/vk_image.h
+++ b/src/vulkan/runtime/vk_image.h
@@ -143,6 +143,11 @@ vk_image_mip_level_extent(const struct vk_image *image,
    return extent;
 }
 
+uint32_t
+vk_image_subresource_slice_count(const struct vk_device *device,
+                                 const struct vk_image *image,
+                                 const VkImageSubresourceLayers *range);
+
 /* This is defined as a macro so that it works for both
  * VkImageSubresourceRange and VkImageSubresourceLayers
  */