[PATCH v4 10/38] drm: kselftest for drm_mm_insert_node()

Chris Wilson
2016-12-22T08:36:13Z

Exercise drm_mm_insert_node(), check that we can't overfill a range and
that the lists are correct after reserving/removing.

v2: Extract helpers for the repeated tests
v3: Iterate over all allocation flags

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 | 234 +++++++++++++++++++++++++++
2 files changed, 235 insertions(+)

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index 693d85677e7f..727c6d7255e0 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -9,3 +9,4 @@ selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */
selftest(init, igt_init)
selftest(debug, igt_debug)
selftest(reserve, igt_reserve)
+selftest(insert, igt_insert)
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 789a810d66aa..feb5985abdc2 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -21,6 +21,23 @@ static unsigned int random_seed;
static unsigned int max_iterations = 8192;
static unsigned int max_prime = 128;

+enum {
+ DEFAULT,
+ TOPDOWN,
+ BEST,
+};
+
+static const struct insert_mode {
+ const char *name;
+ unsigned int search_flags;
+ unsigned int create_flags;
+} insert_modes[] = {
+ [DEFAULT] = { "default", DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT },
+ [TOPDOWN] = { "top-down", DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP },
+ [BEST] = { "best", DRM_MM_SEARCH_BEST, DRM_MM_CREATE_DEFAULT },
+ {}
+};
+
static int igt_sanitycheck(void *ignored)
{
pr_info("%s - ok!\n", __func__);
@@ -131,6 +148,48 @@ static bool assert_continuous(const struct drm_mm *mm, u64 size)
return true;
}

+static u64 misalignment(struct drm_mm_node *node, u64 alignment)
+{
+ u64 rem;
+
+ if (!alignment)
+ return 0;
+
+ div64_u64_rem(node->start, alignment, &rem);
+ return rem;
+}
+
+static bool assert_node(struct drm_mm_node *node, struct drm_mm *mm,
+ u64 size, u64 alignment, unsigned long color)
+{
+ bool ok = true;
+
+ if (!drm_mm_node_allocated(node) || node->mm != mm) {
+ pr_err("node not allocated\n");
+ ok = false;
+ }
+
+ if (node->size != size) {
+ pr_err("node has wrong size, found %llu, expected %llu\n",
+ node->size, size);
+ ok = false;
+ }
+
+ if (misalignment(node, alignment)) {
+ pr_err("node is misalinged, start %llx rem %llu, expected alignment %llu\n",
+ node->start, misalignment(node, alignment), alignment);
+ ok = false;
+ }
+
+ if (node->color != color) {
+ pr_err("node has wrong color, found %lu, expected %lu\n",
+ node->color, color);
+ ok = false;
+ }
+
+ return ok;
+}
+
static int igt_init(void *ignored)
{
const unsigned int size = 4096;
@@ -451,6 +510,181 @@ static int igt_reserve(void *ignored)
return 0;
}

+static bool expect_insert(struct drm_mm *mm, struct drm_mm_node *node,
+ u64 size, u64 alignment, unsigned long color,
+ const struct insert_mode *mode)
+{
+ int err;
+
+ err = drm_mm_insert_node_generic(mm, node,
+ size, alignment, color,
+ mode->search_flags,
+ mode->create_flags);
+ if (err) {
+ pr_err("insert (size=%llu, alignment=%llu, color=%lu, mode=%s) failed with err=%d\n",
+ size, alignment, color, mode->name, err);
+ return false;
+ }
+
+ if (!assert_node(node, mm, size, alignment, color)) {
+ drm_mm_remove_node(node);
+ return false;
+ }
+
+ return true;
+}
+
+static bool expect_insert_fail(struct drm_mm *mm, u64 size)
+{
+ struct drm_mm_node tmp = {};
+ int err;
+
+ err = drm_mm_insert_node(mm, &tmp, size, 0, DRM_MM_SEARCH_DEFAULT);
+ if (likely(err == -ENOSPC))
+ return true;
+
+ if (!err) {
+ pr_err("impossible insert succeeded, node %llu + %llu\n",
+ tmp.start, tmp.size);
+ drm_mm_remove_node(&tmp);
+ } else {
+ pr_err("impossible insert failed with wrong error %d [expected %d], size %llu\n",
+ err, -ENOSPC, size);
+ }
+ return false;
+}
+
+static int __igt_insert(unsigned int count, u64 size)
+{
+ DRM_RND_STATE(prng, random_seed);
+ const struct insert_mode *mode;
+ struct drm_mm mm;
+ struct drm_mm_node *nodes, *node, *next;
+ unsigned int *order, n, m, o = 0;
+ int ret;
+
+ /* Fill a range with lots of nodes, check it doesn't fail too early */
+
+ DRM_MM_BUG_ON(!count);
+ DRM_MM_BUG_ON(!size);
+
+ ret = -ENOMEM;
+ nodes = vzalloc(count * sizeof(*nodes));
+ if (!nodes)
+ goto err;
+
+ order = drm_random_order(count, &prng);
+ if (!order)
+ goto err_nodes;
+
+ ret = -EINVAL;
+ drm_mm_init(&mm, 0, count * size);
+
+ for (mode = insert_modes; mode->name; mode++) {
+ for (n = 0; n < count; n++) {
+ if (!expect_insert(&mm, &nodes[n], size, 0, n, mode)) {
+ pr_err("%s insert failed, size %llu step %d\n",
+ mode->name, size, n);
+ goto out;
+ }
+ }
+
+ /* After random insertion the nodes should be in order */
+ if (!assert_continuous(&mm, size))
+ goto out;
+
+ /* Repeated use should then fail */
+ if (!expect_insert_fail(&mm, size))
+ goto out;
+
+ /* Remove one and reinsert, as the only hole it should refill itself */
+ for (n = 0; n < count; n++) {
+ u64 addr = nodes[n].start;
+
+ drm_mm_remove_node(&nodes[n]);
+ if (!expect_insert(&mm, &nodes[n], size, 0, n, mode)) {
+ pr_err("%s reinsert failed, size %llu step %d\n",
+ mode->name, size, 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_continuous(&mm, size))
+ goto out;
+ }
+
+ /* Remove several, reinsert, check full */
+ for_each_prime_number(n, min(max_prime, count)) {
+ for (m = 0; m < n; m++) {
+ node = &nodes[order[(o + m) % count]];
+ drm_mm_remove_node(node);
+ }
+
+ for (m = 0; m < n; m++) {
+ node = &nodes[order[(o + m) % count]];
+ if (!expect_insert(&mm, node, size, 0, n, mode)) {
+ pr_err("%s multiple reinsert failed, size %llu step %d\n",
+ mode->name, size, n);
+ goto out;
+ }
+ }
+
+ o += n;
+
+ if (!assert_continuous(&mm, size))
+ goto out;
+
+ if (!expect_insert_fail(&mm, 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);
+ kfree(order);
+err_nodes:
+ vfree(nodes);
+err:
+ return ret;
+}
+
+static int igt_insert(void *ignored)
+{
+ const unsigned int count = min_t(unsigned int, BIT(10), max_iterations);
+ unsigned int n;
+ int ret;
+
+ for_each_prime_number_from(n, 1, 54) {
+ u64 size = BIT_ULL(n);
+
+ ret = __igt_insert(count, size - 1);
+ if (ret)
+ return ret;
+
+ ret = __igt_insert(count, size);
+ if (ret)
+ return ret;
+
+ ret = __igt_insert(count, size + 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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