Check that we can request alignment to any power-of-two or prime using a
plain drm_mm_node_insert(), and also handle a reasonable selection of
primes.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/selftests/drm_mm_selftests.h | 3 +
drivers/gpu/drm/selftests/test-drm_mm.c | 104 +++++++++++++++++++++++++++
2 files changed, 107 insertions(+)
diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h
b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index f2bd271fc21c..9eb0c9fd9dff 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -5,6 +5,9 @@
*
* Tests are executed in reverse order by igt/drm_mm
*/
+selftest(align64, igt_align64)
+selftest(align32, igt_align32)
+selftest(align, igt_align)
selftest(insert_range, igt_insert_range)
selftest(replace, igt_replace)
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 92744221749b..be47e4aeec12 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -669,6 +669,110 @@ static int igt_insert_range(void *ignored)
return 0;
}
+static int igt_align(void *ignored)
+{
+ struct drm_mm mm;
+ struct drm_mm_node *node, *next;
+ int ret = -EINVAL;
+ int prime;
+
+ drm_mm_init(&mm, 1, U64_MAX - 1);
+
+ drm_for_each_prime(prime, 8192) {
+ u64 size;
+ int err;
+
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ size = drm_next_prime_number(prime);
+ err = drm_mm_insert_node_generic(&mm, node, size, prime, 0,
+ DRM_MM_SEARCH_DEFAULT,
+ DRM_MM_CREATE_DEFAULT);
+ if (err) {
+ pr_err("insert failed with alignment=%d", prime);
+ ret = err;
+ goto out;
+ }
+
+ if ((int)node->start % prime) {
+ pr_err("node inserted into wrong location %llx,
expected alignment to %d [rem %d]\n",
+ node->start, prime, (int)node->start % prime);
+ goto out;
+ }
+ }
+
+ ret = 0;
+out:
+ drm_mm_for_each_node_safe(node, next, &mm) {
+ drm_mm_remove_node(node);
+ kfree(node);
+ }
+ drm_mm_takedown(&mm);
+ return ret;
+}
+
+static int igt_align_pot(int max)
+{
+ struct drm_mm mm;
+ struct drm_mm_node *node, *next;
+ int bit;
+ int ret = -EINVAL;
+
+ drm_mm_init(&mm, 1, U64_MAX - 1);
+
+ for (bit = max - 1; bit; bit--) {
+ u64 align, size;
+ int err;
+
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ align = BIT_ULL(bit);
+ size = BIT_ULL(bit-1) + 1;
+ err = drm_mm_insert_node_generic(&mm, node, size, align, 0,
+ DRM_MM_SEARCH_DEFAULT,
+ DRM_MM_CREATE_DEFAULT);
+ if (err) {
+ pr_err("insert failed with alignment=%llx [%d]",
+ align, bit);
+ ret = err;
+ goto out;
+ }
+
+ if (node->start & (align - 1)) {
+ pr_err("node inserted into wrong location %llx,
expected alignment to %llx [%d]\n",
+ node->start, align, bit);
+ goto out;
+ }
+ }
+
+ ret = 0;
+out:
+ drm_mm_for_each_node_safe(node, next, &mm) {
+ drm_mm_remove_node(node);
+ kfree(node);
+ }
+ drm_mm_takedown(&mm);
+ return ret;
+}
+
+static int igt_align32(void *ignored)
+{
+ return igt_align_pot(32);
+}
+
+static int igt_align64(void *ignored)
+{
+ return igt_align_pot(64);
+}
+
#include "drm_selftest.c"
static int __init test_drm_mm_init(void)
--
2.11.0
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