[Enhancement] Add force_refresh support for GLM-Image for cache-dit 1.3.0 upgrade (#1858)

Signed-off-by: samithuang <285365963@qq.com>
Signed-off-by: Samit <285365963@qq.com>
Signed-off-by: Didan Deng <33117903+wtomin@users.noreply.github.com>
Co-authored-by: Didan Deng <33117903+wtomin@users.noreply.github.com>

vllm_omni/diffusion/cache/cache_dit_backend.py

@@ -61,6 +61,8 @@ def _build_db_cache_config(cache_config: Any) -> DBCacheConfig:
         max_cached_steps=cache_config.max_cached_steps,
         max_continuous_cached_steps=cache_config.max_continuous_cached_steps,
         residual_diff_threshold=cache_config.residual_diff_threshold,
+        force_refresh_step_hint=cache_config.force_refresh_step_hint,
+        force_refresh_step_policy=cache_config.force_refresh_step_policy,
     )
 
 
@@ -1091,6 +1093,36 @@ def enable_cache_for_bagel(pipeline: Any, cache_config: Any) -> Callable[[int],
     return refresh_cache_context
 
 
+def enable_cache_for_glm_image(pipeline: Any, cache_config: Any) -> Callable[[int], None]:
+    """Enable cache-dit for GLM-Image pipeline.
+
+    GLM-Image processes prompt and image by calling the transformer before the
+    denoising loop. When an input image is provided (editing mode), the cache must
+    be force-refreshed after the preprocessing step so stale hidden states are
+    discarded. Set force_refresh_step_hint = 1 for editing, None for text-to-image.
+    """
+    db_cache_config = _build_db_cache_config(cache_config)
+
+    calibrator_config = None
+    if cache_config.enable_taylorseer:
+        calibrator_config = TaylorSeerCalibratorConfig(taylorseer_order=cache_config.taylorseer_order)
+        logger.info(f"TaylorSeer enabled with order={cache_config.taylorseer_order}")
+
+    logger.info(
+        f"Enabling cache-dit on GLM-Image transformer: "
+        f"Fn={db_cache_config.Fn_compute_blocks}, "
+        f"Bn={db_cache_config.Bn_compute_blocks}, "
+        f"W={db_cache_config.max_warmup_steps}, "
+        f"force_refresh_step_hint={db_cache_config.force_refresh_step_hint}, "
+    )
+
+    cache_dit.enable_cache(
+        pipeline.transformer,
+        cache_config=db_cache_config,
+        calibrator_config=calibrator_config,
+    )
+
+
 def enable_cache_for_flux2(pipeline: Any, cache_config: Any) -> Callable[[int], None]:
     """Enable cache-dit for Flux.2-dev pipeline.
 
@@ -1180,6 +1212,7 @@ CUSTOM_DIT_ENABLERS.update(
         "LTX2Pipeline": enable_cache_for_ltx2,
         "LTX2ImageToVideoPipeline": enable_cache_for_ltx2,
         "BagelPipeline": enable_cache_for_bagel,
+        "GlmImagePipeline": enable_cache_for_glm_image,
         "Flux2Pipeline": enable_cache_for_flux2,
     }
 )