drm/i915/gem: Prefer drm_WARN* over WARN*

struct drm_device specific drm_WARN* macros include device information
in the backtrace, so we know what device the warnings originate from.

Prefer drm_WARN* over WARN* at places where struct drm_device pointer
can be extracted.
Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200504181600.18503-6-pankaj.laxminarayan.bharadiya@intel.com

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -1626,7 +1626,7 @@ eb_relocate_entry(struct i915_execbuffer *eb,
 			err = i915_vma_bind(target->vma,
 					    target->vma->obj->cache_level,
 					    PIN_GLOBAL, NULL);
-			if (WARN_ONCE(err,
+			if (drm_WARN_ONCE(&i915->drm, err,
 				      "Unexpected failure to bind target VMA!"))
 				return err;
 		}

drivers/gpu/drm/i915/gem/i915_gem_phys.c

@@ -29,7 +29,8 @@ static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
 	void *dst;
 	int i;
 
-	if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
+	if (drm_WARN_ON(obj->base.dev,
+			i915_gem_object_needs_bit17_swizzle(obj)))
 		return -EINVAL;
 
 	/*

drivers/gpu/drm/i915/gem/i915_gem_userptr.c

@@ -235,7 +235,7 @@ i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj,
 	if (flags & I915_USERPTR_UNSYNCHRONIZED)
 		return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
 
-	if (WARN_ON(obj->userptr.mm == NULL))
+	if (drm_WARN_ON(obj->base.dev, obj->userptr.mm == NULL))
 		return -EINVAL;
 
 	mn = i915_mmu_notifier_find(obj->userptr.mm);