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