drm/i915/selftests: Markup __iomem for igt_gem_coherency

Silence sparse warnings by using __iomem markup and io accessors.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114191842.19063-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/selftests/i915_gem_coherency.c

@@ -33,7 +33,7 @@ static int cpu_set(struct drm_i915_gem_object *obj,
 {
 	unsigned int needs_clflush;
 	struct page *page;
-	typeof(v) *map;
+	u32 *map;
 	int err;
 
 	err = i915_gem_obj_prepare_shmem_write(obj, &needs_clflush);
@@ -59,7 +59,7 @@ static int cpu_get(struct drm_i915_gem_object *obj,
 {
 	unsigned int needs_clflush;
 	struct page *page;
-	typeof(v) map;
+	u32 *map;
 	int err;
 
 	err = i915_gem_obj_prepare_shmem_read(obj, &needs_clflush);
@@ -82,7 +82,7 @@ static int gtt_set(struct drm_i915_gem_object *obj,
 		   u32 v)
 {
 	struct i915_vma *vma;
-	typeof(v) *map;
+	u32 __iomem *map;
 	int err;
 
 	err = i915_gem_object_set_to_gtt_domain(obj, true);
@@ -98,7 +98,7 @@ static int gtt_set(struct drm_i915_gem_object *obj,
 	if (IS_ERR(map))
 		return PTR_ERR(map);
 
-	map[offset / sizeof(*map)] = v;
+	iowrite32(v, &map[offset / sizeof(*map)]);
 	i915_vma_unpin_iomap(vma);
 
 	return 0;
@@ -109,7 +109,7 @@ static int gtt_get(struct drm_i915_gem_object *obj,
 		   u32 *v)
 {
 	struct i915_vma *vma;
-	typeof(v) map;
+	u32 __iomem *map;
 	int err;
 
 	err = i915_gem_object_set_to_gtt_domain(obj, false);
@@ -125,7 +125,7 @@ static int gtt_get(struct drm_i915_gem_object *obj,
 	if (IS_ERR(map))
 		return PTR_ERR(map);
 
-	*v = map[offset / sizeof(*map)];
+	*v = ioread32(&map[offset / sizeof(*map)]);
 	i915_vma_unpin_iomap(vma);
 
 	return 0;
@@ -135,7 +135,7 @@ static int wc_set(struct drm_i915_gem_object *obj,
 		  unsigned long offset,
 		  u32 v)
 {
-	typeof(v) *map;
+	u32 *map;
 	int err;
 
 	err = i915_gem_object_set_to_wc_domain(obj, true);
@@ -156,7 +156,7 @@ static int wc_get(struct drm_i915_gem_object *obj,
 		  unsigned long offset,
 		  u32 *v)
 {
-	typeof(v) map;
+	u32 *map;
 	int err;
 
 	err = i915_gem_object_set_to_wc_domain(obj, false);