drm/amdkcl: always init drm_device.dev_private

Although v5.5-rc2-1531-ge62bf83aa1bb has removed checking on dev->dev_private,
some distro with kernel v5.6+ (such as ubuntu20.04-oem) may still access dev->dev_private
In case of accessing dev->dev_private in drm code, init dev->dev_private to amdgpu_device.
Wrap this initialization with kcl inline function for easy tracking.

This patch is caused by the following patches:
f9896ea drm/amdkcl: test whether drm checking on dev->dev_private
82fc7ac drm/amdgpu: Embed drm_device into amdgpu_device (v2)

Signed-off-by: Yang Xiong <Yang.Xiong@amd.com>
Reviewed-by: Flora Cui <flora.cui@amd.com>
Acked-by: Guchun Chen <guchun.chen@amd.com>
Change-Id: Ida1c4c10753865c036f21c577a3b552f4e14c2d5

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -1198,9 +1198,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 		return PTR_ERR(ddev);
 	adev->ddev = ddev;
 #endif
-#ifdef AMDKCL_CHECK_DRM_DEVICE_DEV_PRIVATE
-	ddev->dev_private = (void *)adev;
-#endif
+	kcl_drm_dev_init_private(ddev, (void *)adev);
 	kcl_drm_vma_offset_manager_init(ddev->vma_offset_manager);
 
 #ifdef HAVE_DRM_DRV_DRIVER_ATOMIC
@@ -1251,10 +1249,8 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 	pci_disable_device(pdev);
 err_free:
 #ifndef HAVE_DRM_DRIVER_RELEASE
-#ifdef AMDKCL_CHECK_DRM_DEVICE_DEV_PRIVATE
-	ddev->dev_private = NULL;
-#endif
 	kfree(adev);
+	kcl_drm_dev_fini_private(ddev);
 #endif
 	drm_dev_put(ddev);
 	return ret;
@@ -1280,10 +1276,8 @@ amdgpu_pci_remove(struct pci_dev *pdev)
 	pci_set_drvdata(pdev, NULL);
 #ifndef HAVE_DRM_DRIVER_RELEASE
 	if (dev) {
-#ifdef AMDKCL_CHECK_DRM_DEVICE_DEV_PRIVATE
-		dev->dev_private = NULL;
-#endif
 		kfree(drm_to_adev(dev));
+		kcl_drm_dev_fini_private(dev);
 	}
 #endif
 	drm_dev_put(dev);

include/kcl/backport/kcl_drm_backport.h

@@ -77,14 +77,6 @@ int _kcl_drm_syncobj_find_fence(struct drm_file *file_private,
 #define AMDKCL_AMDGPU_DEBUGFS_CLEANUP
 #endif
 
-/*
- * commit v5.5-rc2-1531-ge62bf83aa1bb
- * drm/irq: remove check on dev->dev_private
- */
-#if DRM_VERSION_CODE < DRM_VERSION(5, 6, 0)
-#define AMDKCL_CHECK_DRM_DEVICE_DEV_PRIVATE
-#endif
-
 #ifndef HAVE_DRM_GEM_OBJECT_LOOKUP_2ARGS
 static inline struct drm_gem_object *
 _kcl_drm_gem_object_lookup(struct drm_file *filp, u32 handle)

include/kcl/kcl_drm.h

@@ -4,12 +4,29 @@
 
 #include <kcl/header/kcl_drmP_h.h>
 #include <drm/drm_gem.h>
+#include <kcl/header/kcl_drm_device_h.h>
 #include <kcl/header/kcl_drm_print_h.h>
 #include <kcl/header/kcl_drm_file_h.h>
 #if defined(HAVE_DRM_COLOR_LUT_SIZE)
 #include <drm/drm_color_mgmt.h>
 #endif
 
+/*
+ * commit v5.5-rc2-1531-ge62bf83aa1bb
+ * drm/irq: remove check on dev->dev_private
+ */
+static inline
+void kcl_drm_dev_init_private(struct drm_device *dev, void *priv)
+{
+       dev->dev_private = priv;
+}
+
+static inline
+void kcl_drm_dev_fini_private(struct drm_device *dev)
+{
+       dev->dev_private = NULL;
+}
+
 #if !defined(HAVE_DRM_DRM_PRINT_H)
 struct drm_printer {
 	void (*printfn)(struct drm_printer *p, struct va_format *vaf);