On pe, 2016-12-09 at 13:08 +0000, Chris Wilson wrote:
> Exercise drm_mm_reserve_node(), check that we can't reserve an already
> occupied range and that the lists are correct after reserving/removing.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_mm_selftests.h | 1 +
> drivers/gpu/drm/test-drm_mm.c | 143 +++++++++++++++++++++++++++++++++++++
Once there is more thorough coverage, I think we should have
drm/selftest/drm_mm.{h,c}
> +static int __igt_reserve(int count, u64 size)
> +{
> + struct drm_mm mm;
> + struct drm_mm_node *node, *next;
> + int *order, n;
> + int ret;
> +
> + /* Fill a range with lots of nodes, check it doesn't fail too early */
> +
> + ret = -ENOMEM;
> + order = random_order(count);
> + if (!order)
> + goto err;
> +
> + ret = -EINVAL;
> + drm_mm_init(&mm, 0, count * size);
> + if (!drm_mm_clean(&mm)) {
> + pr_err("mm not empty on creation\n");
> + goto out;
> + }
This code gets covered already done in more basic test, I think we
should avoid duplication from the start as we now have trouble with
runtime of tests.
> +static int igt_reserve(void *ignored)
> +{
> + int n, ret;
> +
> + for (n = 1; n < 50; n++) {
The right amount of loops might be something to discuss.
> + ret = __igt_reserve(8192, (1ull << n) - 1);
BIT_ULL(n) - 1?
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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