LXR linux/drivers/gpu/drm/i915/gt/st_shmem

   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
   8static 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
  49out_map:
  50        shmem_unpin_map(file, map);
  51out_file:
  52        fput(file);
  53        return err;
  54}
  55
  56int 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