Check that if we request top-down allocation from drm_mm_insert_node() we receive the next available hole from the top.
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen joonas.lahtinen@linux.intel.com --- drivers/gpu/drm/selftests/drm_mm_selftests.h | 1 + drivers/gpu/drm/selftests/test-drm_mm.c | 119 +++++++++++++++++++++++++++ 2 files changed, 120 insertions(+)
diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h index 965aca65c160..cd508e3d6538 100644 --- a/drivers/gpu/drm/selftests/drm_mm_selftests.h +++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h @@ -17,3 +17,4 @@ selftest(align32, igt_align32) selftest(align64, igt_align64) selftest(evict, igt_evict) selftest(evict_range, igt_evict_range) +selftest(topdown, igt_topdown) diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c index f662d98177ee..a499895a76c4 100644 --- a/drivers/gpu/drm/selftests/test-drm_mm.c +++ b/drivers/gpu/drm/selftests/test-drm_mm.c @@ -1547,6 +1547,125 @@ static int igt_evict_range(void *ignored) return ret; }
+static unsigned int node_index(const struct drm_mm_node *node) +{ + return div64_u64(node->start, node->size); +} + +static int igt_topdown(void *ignored) +{ + const struct insert_mode *topdown = &insert_modes[TOPDOWN]; + DRM_RND_STATE(prng, random_seed); + const unsigned int count = 8192; + unsigned int size; + unsigned long *bitmap = NULL; + struct drm_mm mm; + struct drm_mm_node *nodes, *node, *next; + unsigned int *order, n, m, o = 0; + int ret; + + /* When allocating top-down, we expect to be returned a node + * from a suitable hole at the top of the drm_mm. We check that + * the returned node does match the highest available slot. + */ + + ret = -ENOMEM; + nodes = vzalloc(count * sizeof(*nodes)); + if (!nodes) + goto err; + + bitmap = kzalloc(count / BITS_PER_LONG * sizeof(unsigned long), + GFP_TEMPORARY); + if (!bitmap) + goto err_nodes; + + order = drm_random_order(count, &prng); + if (!order) + goto err_bitmap; + + ret = -EINVAL; + for (size = 1; size <= 64; size <<= 1) { + drm_mm_init(&mm, 0, size*count); + for (n = 0; n < count; n++) { + if (!expect_insert(&mm, &nodes[n], + size, 0, n, + topdown)) { + pr_err("insert failed, size %u step %d\n", size, n); + goto out; + } + + if (nodes[n].hole_follows) { + pr_err("hole after topdown insert %d, start=%llx\n, size=%u", + n, nodes[n].start, size); + goto out; + } + + if (!assert_one_hole(&mm, 0, size*(count - n - 1))) + goto out; + } + + if (!assert_continuous(&mm, size)) + goto out; + + drm_random_reorder(order, count, &prng); + for_each_prime_number(n, min(count, max_prime)) { + for (m = 0; m < n; m++) { + node = &nodes[order[(o + m) % count]]; + drm_mm_remove_node(node); + __set_bit(node_index(node), bitmap); + } + + for (m = 0; m < n; m++) { + unsigned int last; + + node = &nodes[order[(o + m) % count]]; + if (!expect_insert(&mm, node, + size, 0, 0, + topdown)) { + pr_err("insert failed, step %d/%d\n", m, n); + goto out; + } + + if (node->hole_follows) { + pr_err("hole after topdown insert %d/%d, start=%llx\n", + m, n, node->start); + goto out; + } + + last = find_last_bit(bitmap, count); + if (node_index(node) != last) { + pr_err("node %d/%d, size %d, not inserted into upmost hole, expected %d, found %d\n", + m, n, size, last, node_index(node)); + goto out; + } + + __clear_bit(last, bitmap); + } + + DRM_MM_BUG_ON(find_first_bit(bitmap, count) != count); + + o += n; + } + + drm_mm_for_each_node_safe(node, next, &mm) + drm_mm_remove_node(node); + DRM_MM_BUG_ON(drm_mm_clean(&mm)); + } + + ret = 0; +out: + drm_mm_for_each_node_safe(node, next, &mm) + drm_mm_remove_node(node); + drm_mm_takedown(&mm); + kfree(order); +err_bitmap: + kfree(bitmap); +err_nodes: + vfree(nodes); +err: + return ret; +} + #include "drm_selftest.c"
static int __init test_drm_mm_init(void)