drm/xe: Stop ignoring errors from xe_ttm_stolen_mgr_init()

Make sure to differentiate normal behavior, e.g. there's no stolen, from
allocation errors or failure to initialize lower layers.

Reviewed-by: Francois Dugast <francois.dugast@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250213192909.996148-5-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

Author: lucasdemarchi

drivers/gpu/drm/xe/xe_device.c

@@ -836,7 +836,9 @@ int xe_device_probe(struct xe_device *xe)
 	}
 
 	/* Allocate and map stolen after potential VRAM resize */
-	xe_ttm_stolen_mgr_init(xe);
+	err = xe_ttm_stolen_mgr_init(xe);
+	if (err)
+		return err;
 
 	/*
 	 * Now that GT is initialized (TTM in particular),

drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c

@@ -207,17 +207,16 @@ static u64 detect_stolen(struct xe_device *xe, struct xe_ttm_stolen_mgr *mgr)
 #endif
 }
 
-void xe_ttm_stolen_mgr_init(struct xe_device *xe)
+int xe_ttm_stolen_mgr_init(struct xe_device *xe)
 {
-	struct xe_ttm_stolen_mgr *mgr = drmm_kzalloc(&xe->drm, sizeof(*mgr), GFP_KERNEL);
 	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+	struct xe_ttm_stolen_mgr *mgr;
 	u64 stolen_size, io_size;
 	int err;
 
-	if (!mgr) {
-		drm_dbg_kms(&xe->drm, "Stolen mgr init failed\n");
-		return;
-	}
+	mgr = drmm_kzalloc(&xe->drm, sizeof(*mgr), GFP_KERNEL);
+	if (!mgr)
+		return -ENOMEM;
 
 	if (IS_SRIOV_VF(xe))
 		stolen_size = 0;
@@ -230,7 +229,7 @@ void xe_ttm_stolen_mgr_init(struct xe_device *xe)
 
 	if (!stolen_size) {
 		drm_dbg_kms(&xe->drm, "No stolen memory support\n");
-		return;
+		return 0;
 	}
 
 	/*
@@ -246,14 +245,16 @@ void xe_ttm_stolen_mgr_init(struct xe_device *xe)
 				     io_size, PAGE_SIZE);
 	if (err) {
 		drm_dbg_kms(&xe->drm, "Stolen mgr init failed: %i\n", err);
-		return;
+		return err;
 	}
 
 	drm_dbg_kms(&xe->drm, "Initialized stolen memory support with %llu bytes\n",
 		    stolen_size);
 
 	if (io_size)
 		mgr->mapping = devm_ioremap_wc(&pdev->dev, mgr->io_base, io_size);
+
+	return 0;
 }
 
 u64 xe_ttm_stolen_io_offset(struct xe_bo *bo, u32 offset)

drivers/gpu/drm/xe/xe_ttm_stolen_mgr.h

@@ -12,7 +12,7 @@ struct ttm_resource;
 struct xe_bo;
 struct xe_device;
 
-void xe_ttm_stolen_mgr_init(struct xe_device *xe);
+int xe_ttm_stolen_mgr_init(struct xe_device *xe);
 int xe_ttm_stolen_io_mem_reserve(struct xe_device *xe, struct ttm_resource *mem);
 bool xe_ttm_stolen_cpu_access_needs_ggtt(struct xe_device *xe);
 u64 xe_ttm_stolen_io_offset(struct xe_bo *bo, u32 offset);