[PATCH v4 12/38] drm: kselftest for drm_mm_insert_node_in_range()

Chris Wilson
2016-12-22T08:36:15Z

Exercise drm_mm_insert_node_in_range(), check that we only allocate from
the specified range.

v2: Use all allocation flags
v3: Don't pass in invalid ranges - these will be asserted later.

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 | 269 +++++++++++++++++++++++++++
2 files changed, 270 insertions(+)

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index dca726baa65d..92b2c1cb10fa 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -11,3 +11,4 @@ selftest(debug, igt_debug)
selftest(reserve, igt_reserve)
selftest(insert, igt_insert)
selftest(replace, igt_replace)
+selftest(insert_range, igt_insert_range)
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 7914428c9862..afc9274d8086 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -738,6 +738,275 @@ static int igt_replace(void *ignored)
return 0;
}

+static bool expect_insert_in_range(struct drm_mm *mm, struct drm_mm_node *node,
+ u64 size, u64 alignment, unsigned long color,
+ u64 range_start, u64 range_end,
+ const struct insert_mode *mode)
+{
+ int err;
+
+ err = drm_mm_insert_node_in_range_generic(mm, node,
+ size, alignment, color,
+ range_start, range_end,
+ mode->search_flags,
+ mode->create_flags);
+ if (err) {
+ pr_err("insert (size=%llu, alignment=%llu, color=%lu, mode=%s) nto range [%llx, %llx] failed with err=%d\n",
+ size, alignment, color, mode->name,
+ range_start, range_end, err);
+ return false;
+ }
+
+ if (!assert_node(node, mm, size, alignment, color)) {
+ drm_mm_remove_node(node);
+ return false;
+ }
+
+ return true;
+}
+
+static bool expect_insert_in_range_fail(struct drm_mm *mm,
+ u64 size,
+ u64 range_start,
+ u64 range_end)
+{
+ struct drm_mm_node tmp = {};
+ int err;
+
+ err = drm_mm_insert_node_in_range_generic(mm, &tmp,
+ size, 0, 0,
+ range_start, range_end,
+ DRM_MM_SEARCH_DEFAULT,
+ DRM_MM_CREATE_DEFAULT);
+ if (likely(err == -ENOSPC))
+ return true;
+
+ if (!err) {
+ pr_err("impossible insert succeeded, node %llx + %llu, range [%llx, %llx]\n",
+ tmp.start, tmp.size, range_start, range_end);
+ drm_mm_remove_node(&tmp);
+ } else {
+ pr_err("impossible insert failed with wrong error %d [expected %d], size %llu, range [%llx, %llx]\n",
+ err, -ENOSPC, size, range_start, range_end);
+ }
+
+ return false;
+}
+
+static bool assert_contiguous_in_range(struct drm_mm *mm,
+ u64 size,
+ u64 start,
+ u64 end)
+{
+ struct drm_mm_node *node;
+ unsigned int n;
+
+ if (!expect_insert_in_range_fail(mm, size, start, end))
+ return false;
+
+ n = div64_u64(start + size - 1, size);
+ drm_mm_for_each_node(node, mm) {
+ if (node->start < start || node->start + node->size > end) {
+ pr_err("node %d out of range, address [%llx + %llu], range [%llx, %llx]\n",
+ n, node->start, node->start + node->size, start, end);
+ return false;
+ }
+
+ if (node->start != n * size) {
+ pr_err("node %d out of order, expected start %llx, found %llx\n",
+ n, n * size, node->start);
+ return false;
+ }
+
+ if (node->size != size) {
+ pr_err("node %d has wrong size, expected size %llx, found %llx\n",
+ n, size, node->size);
+ return false;
+ }
+
+ if (node->hole_follows && drm_mm_hole_node_end(node) < end) {
+ pr_err("node %d is followed by a hole!\n", n);
+ return false;
+ }
+
+ n++;
+ }
+
+ drm_mm_for_each_node_in_range(node, mm, 0, start) {
+ if (node) {
+ pr_err("node before start: node=%llx+%llu, start=%llx\n",
+ node->start, node->size, start);
+ return false;
+ }
+ }
+
+ drm_mm_for_each_node_in_range(node, mm, end, U64_MAX) {
+ if (node) {
+ pr_err("node after end: node=%llx+%llu, end=%llx\n",
+ node->start, node->size, end);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static int __igt_insert_range(unsigned int count, u64 size, u64 start, u64 end)
+{
+ const struct insert_mode *mode;
+ struct drm_mm mm;
+ struct drm_mm_node *nodes, *node, *next;
+ unsigned int n, start_n, end_n;
+ int ret;
+
+ DRM_MM_BUG_ON(!count);
+ DRM_MM_BUG_ON(!size);
+ DRM_MM_BUG_ON(end <= start);
+
+ /* Very similar to __igt_insert(), but now instead of populating the
+ * full range of the drm_mm, we try to fill a small portion of it.
+ */
+
+ ret = -ENOMEM;
+ nodes = vzalloc(count * sizeof(*nodes));
+ if (!nodes)
+ goto err;
+
+ ret = -EINVAL;
+ drm_mm_init(&mm, 0, count * size);
+
+ start_n = div64_u64(start + size - 1, size);
+ end_n = div64_u64(end - size, size);
+
+ for (mode = insert_modes; mode->name; mode++) {
+ for (n = start_n; n <= end_n; n++) {
+ if (!expect_insert_in_range(&mm, &nodes[n],
+ size, size, n,
+ start, end, mode)) {
+ pr_err("%s insert failed, size %llu, step %d [%d, %d], range [%llx, %llx]\n",
+ mode->name, size, n,
+ start_n, end_n,
+ start, end);
+ goto out;
+ }
+ }
+
+ if (!assert_contiguous_in_range(&mm, size, start, end)) {
+ pr_err("%s: range [%llx, %llx] not full after initialisation, size=%llu\n",
+ mode->name, start, end, size);
+ goto out;
+ }
+
+ /* Remove one and reinsert, it should refill itself */
+ for (n = start_n; n <= end_n; n++) {
+ u64 addr = nodes[n].start;
+
+ drm_mm_remove_node(&nodes[n]);
+ if (!expect_insert_in_range(&mm, &nodes[n],
+ size, size, n,
+ start, end, mode)) {
+ pr_err("%s reinsert failed, step %d\n", mode->name, n);
+ goto out;
+ }
+
+ if (nodes[n].start != addr) {
+ pr_err("%s reinsert node moved, step %d, expected %llx, found %llx\n",
+ mode->name, n, addr, nodes[n].start);
+ goto out;
+ }
+ }
+
+ if (!assert_contiguous_in_range(&mm, size, start, end)) {
+ pr_err("%s: range [%llx, %llx] not full after reinsertion, size=%llu\n",
+ mode->name, start, end, size);
+ goto out;
+ }
+
+ 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);
+ vfree(nodes);
+err:
+ return ret;
+}
+
+static int insert_outside_range(void)
+{
+ struct drm_mm mm;
+ const unsigned int start = 1024;
+ const unsigned int end = 2048;
+ const unsigned int size = end - start;
+
+ drm_mm_init(&mm, start, size);
+
+ if (!expect_insert_in_range_fail(&mm, 1, 0, start))
+ return -EINVAL;
+
+ if (!expect_insert_in_range_fail(&mm, size,
+ start - size/2, start + (size+1)/2))
+ return -EINVAL;
+
+ if (!expect_insert_in_range_fail(&mm, size,
+ end - (size+1)/2, end + size/2))
+ return -EINVAL;
+
+ if (!expect_insert_in_range_fail(&mm, 1, end, end + size))
+ return -EINVAL;
+
+ drm_mm_takedown(&mm);
+ return 0;
+}
+
+static int igt_insert_range(void *ignored)
+{
+ const unsigned int count = min_t(unsigned int, BIT(13), max_iterations);
+ unsigned int n;
+ int ret;
+
+ /* Check that requests outside the bounds of drm_mm are rejected. */
+ ret = insert_outside_range();
+ if (ret)
+ return ret;
+
+ for_each_prime_number_from(n, 1, 50) {
+ const u64 size = BIT_ULL(n);
+ const u64 max = count * size;
+
+ ret = __igt_insert_range(count, size, 0, max);
+ if (ret)
+ return ret;
+
+ ret = __igt_insert_range(count, size, 1, max);
+ if (ret)
+ return ret;
+
+ ret = __igt_insert_range(count, size, 0, max - 1);
+ if (ret)
+ return ret;
+
+ ret = __igt_insert_range(count, size, 0, max/2);
+ if (ret)
+ return ret;
+
+ ret = __igt_insert_range(count, size, max/2, max);
+ if (ret)
+ return ret;
+
+ ret = __igt_insert_range(count, size, max/4+1, 3*max/4-1);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
#include "drm_selftest.c"

static int __init test_drm_mm_init(void)
--
2.11.0

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