[PATCH v4 17/38] drm: kselftest for drm_mm and color adjustment

Chris Wilson
2016-12-22T08:36:20Z

Check that after applying the driver's color adjustment, fitting of the
node and its alignment are still correct.

v2: s/no_color_touching/separate_adjacent_colors/

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 | 183 +++++++++++++++++++++++++++
2 files changed, 184 insertions(+)

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index cd508e3d6538..ff44f39a1826 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -18,3 +18,4 @@ selftest(align64, igt_align64)
selftest(evict, igt_evict)
selftest(evict_range, igt_evict_range)
selftest(topdown, igt_topdown)
+selftest(color, igt_color)
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index d3d4e4f39042..24841d3994dc 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -1671,6 +1671,189 @@ static int igt_topdown(void *ignored)
return ret;
}

+static void separate_adjacent_colors(const struct drm_mm_node *node,
+ unsigned long color,
+ u64 *start,
+ u64 *end)
+{
+ if (node->allocated && node->color != color)
+ ++*start;
+
+ node = list_next_entry(node, node_list);
+ if (node->allocated && node->color != color)
+ --*end;
+}
+
+static bool colors_abutt(const struct drm_mm_node *node)
+{
+ if (!node->hole_follows &&
+ list_next_entry(node, node_list)->allocated) {
+ pr_err("colors abutt; %ld [%llx + %llx] is next to %ld [%llx + %llx]!\n",
+ node->color, node->start, node->size,
+ list_next_entry(node, node_list)->color,
+ list_next_entry(node, node_list)->start,
+ list_next_entry(node, node_list)->size);
+ return true;
+ }
+
+ return false;
+}
+
+static int igt_color(void *ignored)
+{
+ const unsigned int count = min(4096u, max_iterations);
+ const struct insert_mode *mode;
+ struct drm_mm mm;
+ struct drm_mm_node *node, *nn;
+ unsigned int n;
+ int ret = -EINVAL, err;
+
+ /* Color adjustment complicates everything. First we just check
+ * that when we insert a node we apply any color_adjustment callback.
+ * The callback we use should ensure that there is a gap between
+ * any two nodes, and so after each insertion we check that those
+ * holes are inserted and that they are preserved.
+ */
+
+ drm_mm_init(&mm, 0, U64_MAX);
+
+ for (n = 1; n <= count; n++) {
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (!expect_insert(&mm, node,
+ n, 0, n,
+ &insert_modes[0])) {
+ pr_err("insert failed, step %d\n", n);
+ kfree(node);
+ goto out;
+ }
+ }
+
+ drm_mm_for_each_node_safe(node, nn, &mm) {
+ if (node->color != node->size) {
+ pr_err("invalid color stored: expected %lld, found %ld\n",
+ node->size, node->color);
+
+ goto out;
+ }
+
+ drm_mm_remove_node(node);
+ kfree(node);
+ }
+
+ /* Now, let's start experimenting with applying a color callback */
+ mm.color_adjust = separate_adjacent_colors;
+ for (mode = insert_modes; mode->name; mode++) {
+ u64 last;
+
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ node->size = 1 + 2*count;
+ node->color = node->size;
+
+ err = drm_mm_reserve_node(&mm, node);
+ if (err) {
+ pr_err("initial reserve failed!\n");
+ ret = err;
+ goto out;
+ }
+
+ last = node->start + node->size;
+
+ for (n = 1; n <= count; n++) {
+ int rem;
+
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ node->start = last;
+ node->size = n + count;
+ node->color = node->size;
+
+ err = drm_mm_reserve_node(&mm, node);
+ if (err != -ENOSPC) {
+ pr_err("reserve %d did not report color overlap! err=%d\n",
+ n, err);
+ goto out;
+ }
+
+ node->start += n + 1;
+ rem = misalignment(node, n + count);
+ node->start += n + count - rem;
+
+ err = drm_mm_reserve_node(&mm, node);
+ if (err) {
+ pr_err("reserve %d failed, err=%d\n", n, err);
+ ret = err;
+ goto out;
+ }
+
+ last = node->start + node->size;
+ }
+
+ for (n = 1; n <= count; n++) {
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (!expect_insert(&mm, node,
+ n, n, n,
+ mode)) {
+ pr_err("%s insert failed, step %d\n",
+ mode->name, n);
+ kfree(node);
+ goto out;
+ }
+ }
+
+ drm_mm_for_each_node_safe(node, nn, &mm) {
+ u64 rem;
+
+ if (node->color != node->size) {
+ pr_err("%s invalid color stored: expected %lld, found %ld\n",
+ mode->name, node->size, node->color);
+
+ goto out;
+ }
+
+ if (colors_abutt(node))
+ goto out;
+
+ div64_u64_rem(node->start, node->size, &rem);
+ if (rem) {
+ pr_err("%s colored node misaligned, start=%llx expected alignment=%lld [rem=%lld]\n",
+ mode->name, node->start, node->size, rem);
+ goto out;
+ }
+
+ drm_mm_remove_node(node);
+ kfree(node);
+ }
+ }
+
+ ret = 0;
+out:
+ drm_mm_for_each_node_safe(node, nn, &mm) {
+ drm_mm_remove_node(node);
+ kfree(node);
+ }
+ drm_mm_takedown(&mm);
+ return ret;
+}
+
#include "drm_selftest.c"

static int __init test_drm_mm_init(void)