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(name: "mock" , data: &datum, len: sizeof(datum)); |
16 | if (IS_ERR(ptr: file)) |
17 | return PTR_ERR(ptr: file); |
18 | |
19 | result = 0; |
20 | err = shmem_read(file, off: 0, dst: &result, len: 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, off: 0, src: &result, len: 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, ptr: 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 | } |
64 | |