+static int igt_lmem_create_cleared_cpu(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ I915_RND_STATE(prng);
+ IGT_TIMEOUT(end_time);
+ u32 size, i;
+ int err;
+
+ i915_gem_drain_freed_objects(i915);
+
+ size = max_t(u32, PAGE_SIZE, i915_prandom_u32_max_state(SZ_32M, &prng));
+ size = round_up(size, PAGE_SIZE);
+ i = 0;
+
+ do {
+ struct drm_i915_gem_object *obj;
+ unsigned int flags;
+ u32 dword, val;
+ void *vaddr;
+
+ /*
+ * Alternate between cleared and uncleared allocations, while
+ * also dirtying the pages each time to check that the pages are
+ * always cleared if requested, since we should get some overlap
+ * of the underlying pages, if not all, since we are the only
+ * user.
+ */
+
+ flags = I915_BO_ALLOC_CPU_CLEAR;
+ if (i & 1)
+ flags = 0;
+
+ obj = i915_gem_object_create_lmem(i915, size, flags);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ i915_gem_object_lock(obj, NULL);
+ err = i915_gem_object_pin_pages(obj);
+ if (err)
+ goto out_put;
+
+ dword = i915_prandom_u32_max_state(PAGE_SIZE / sizeof(u32),
+ &prng);
+
+ if (flags & I915_BO_ALLOC_CPU_CLEAR) {
+ err = igt_cpu_check(obj, dword, 0);
+ if (err) {
+ pr_err("%s failed with size=%u, flags=%u\n",
+ __func__, size, flags);
+ goto out_unpin;
+ }
+ }
+
+ vaddr = i915_gem_object_pin_map(obj, I915_MAP_WC);
+ if (IS_ERR(vaddr)) {
+ err = PTR_ERR(vaddr);
+ goto out_unpin;
+ }
+
+ val = prandom_u32_state(&prng);
+
+ memset32(vaddr, val, obj->base.size / sizeof(u32));
+
+ i915_gem_object_flush_map(obj);
+ i915_gem_object_unpin_map(obj);
+out_unpin:
+ i915_gem_object_unpin_pages(obj);
+ __i915_gem_object_put_pages(obj);
+out_put:
+ i915_gem_object_unlock(obj);
+ i915_gem_object_put(obj);
+
+ if (err)
+ break;
+ ++i;
+ } while (!__igt_timeout(end_time, NULL));
+
+ pr_info("%s completed (%u) iterations\n", __func__, i);
+
+ return err;
+}
+