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