1*ad8b1aafSjsg // SPDX-License-Identifier: MIT
2*ad8b1aafSjsg /*
3*ad8b1aafSjsg * Copyright © 2020 Intel Corporation
4*ad8b1aafSjsg */
5*ad8b1aafSjsg
6*ad8b1aafSjsg /* Just a quick and causal check of the shmem_utils API */
7*ad8b1aafSjsg
igt_shmem_basic(void * ignored)8*ad8b1aafSjsg static int igt_shmem_basic(void *ignored)
9*ad8b1aafSjsg {
10*ad8b1aafSjsg u32 datum = 0xdeadbeef, result;
11*ad8b1aafSjsg struct file *file;
12*ad8b1aafSjsg u32 *map;
13*ad8b1aafSjsg int err;
14*ad8b1aafSjsg
15*ad8b1aafSjsg file = shmem_create_from_data("mock", &datum, sizeof(datum));
16*ad8b1aafSjsg if (IS_ERR(file))
17*ad8b1aafSjsg return PTR_ERR(file);
18*ad8b1aafSjsg
19*ad8b1aafSjsg result = 0;
20*ad8b1aafSjsg err = shmem_read(file, 0, &result, sizeof(result));
21*ad8b1aafSjsg if (err)
22*ad8b1aafSjsg goto out_file;
23*ad8b1aafSjsg
24*ad8b1aafSjsg if (result != datum) {
25*ad8b1aafSjsg pr_err("Incorrect read back from shmemfs: %x != %x\n",
26*ad8b1aafSjsg result, datum);
27*ad8b1aafSjsg err = -EINVAL;
28*ad8b1aafSjsg goto out_file;
29*ad8b1aafSjsg }
30*ad8b1aafSjsg
31*ad8b1aafSjsg result = 0xc0ffee;
32*ad8b1aafSjsg err = shmem_write(file, 0, &result, sizeof(result));
33*ad8b1aafSjsg if (err)
34*ad8b1aafSjsg goto out_file;
35*ad8b1aafSjsg
36*ad8b1aafSjsg map = shmem_pin_map(file);
37*ad8b1aafSjsg if (!map) {
38*ad8b1aafSjsg err = -ENOMEM;
39*ad8b1aafSjsg goto out_file;
40*ad8b1aafSjsg }
41*ad8b1aafSjsg
42*ad8b1aafSjsg if (*map != result) {
43*ad8b1aafSjsg pr_err("Incorrect read back via mmap of last write: %x != %x\n",
44*ad8b1aafSjsg *map, result);
45*ad8b1aafSjsg err = -EINVAL;
46*ad8b1aafSjsg goto out_map;
47*ad8b1aafSjsg }
48*ad8b1aafSjsg
49*ad8b1aafSjsg out_map:
50*ad8b1aafSjsg shmem_unpin_map(file, map);
51*ad8b1aafSjsg out_file:
52*ad8b1aafSjsg fput(file);
53*ad8b1aafSjsg return err;
54*ad8b1aafSjsg }
55*ad8b1aafSjsg
shmem_utils_mock_selftests(void)56*ad8b1aafSjsg int shmem_utils_mock_selftests(void)
57*ad8b1aafSjsg {
58*ad8b1aafSjsg static const struct i915_subtest tests[] = {
59*ad8b1aafSjsg SUBTEST(igt_shmem_basic),
60*ad8b1aafSjsg };
61*ad8b1aafSjsg
62*ad8b1aafSjsg return i915_subtests(tests, NULL);
63*ad8b1aafSjsg }
64