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      1 /*	$NetBSD: i915_gem_phys.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $	*/
      2 
      3 /*
      4  * SPDX-License-Identifier: MIT
      5  *
      6  * Copyright  2016 Intel Corporation
      7  */
      8 
      9 #include <sys/cdefs.h>
     10 __KERNEL_RCSID(0, "$NetBSD: i915_gem_phys.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $");
     11 
     12 #include "i915_selftest.h"
     13 
     14 #include "selftests/mock_gem_device.h"
     15 
     16 static int mock_phys_object(void *arg)
     17 {
     18 	struct drm_i915_private *i915 = arg;
     19 	struct drm_i915_gem_object *obj;
     20 	int err;
     21 
     22 	/* Create an object and bind it to a contiguous set of physical pages,
     23 	 * i.e. exercise the i915_gem_object_phys API.
     24 	 */
     25 
     26 	obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
     27 	if (IS_ERR(obj)) {
     28 		err = PTR_ERR(obj);
     29 		pr_err("i915_gem_object_create failed, err=%d\n", err);
     30 		goto out;
     31 	}
     32 
     33 	err = i915_gem_object_attach_phys(obj, PAGE_SIZE);
     34 	if (err) {
     35 		pr_err("i915_gem_object_attach_phys failed, err=%d\n", err);
     36 		goto out_obj;
     37 	}
     38 
     39 	if (obj->ops != &i915_gem_phys_ops) {
     40 		pr_err("i915_gem_object_attach_phys did not create a phys object\n");
     41 		err = -EINVAL;
     42 		goto out_obj;
     43 	}
     44 
     45 	if (!atomic_read(&obj->mm.pages_pin_count)) {
     46 		pr_err("i915_gem_object_attach_phys did not pin its phys pages\n");
     47 		err = -EINVAL;
     48 		goto out_obj;
     49 	}
     50 
     51 	/* Make the object dirty so that put_pages must do copy back the data */
     52 	i915_gem_object_lock(obj);
     53 	err = i915_gem_object_set_to_gtt_domain(obj, true);
     54 	i915_gem_object_unlock(obj);
     55 	if (err) {
     56 		pr_err("i915_gem_object_set_to_gtt_domain failed with err=%d\n",
     57 		       err);
     58 		goto out_obj;
     59 	}
     60 
     61 out_obj:
     62 	i915_gem_object_put(obj);
     63 out:
     64 	return err;
     65 }
     66 
     67 int i915_gem_phys_mock_selftests(void)
     68 {
     69 	static const struct i915_subtest tests[] = {
     70 		SUBTEST(mock_phys_object),
     71 	};
     72 	struct drm_i915_private *i915;
     73 	int err;
     74 
     75 	i915 = mock_gem_device();
     76 	if (!i915)
     77 		return -ENOMEM;
     78 
     79 	err = i915_subtests(tests, i915);
     80 
     81 	drm_dev_put(&i915->drm);
     82 	return err;
     83 }
     84