This patch introduces fragmentation in the address range
and measures time taken by 10k insertions for each modes.
ig_frag() will fail if one of the mode takes more than 1 sec.
Output:
<snip>
[ 37.326723] drm_mm: igt_sanitycheck - ok!
[ 37.326727] igt_debug 0x0000000000000000-0x0000000000000200: 512: free
[ 37.326728] igt_debug 0x0000000000000200-0x0000000000000600: 1024: used
[ 37.326728] igt_debug 0x0000000000000600-0x0000000000000a00: 1024: free
[ 37.326729] igt_debug 0x0000000000000a00-0x0000000000000e00: 1024: used
[ 37.326730] igt_debug 0x0000000000000e00-0x0000000000001000: 512: free
[ 37.326730] igt_debug total: 4096, used 2048 free 2048
[ 56.040064] drm_mm: best fragmented insert took 504 msecs
[ 56.082184] drm_mm: bottom-up fragmented insert took 40 msecs
[ 56.102255] drm_mm: top-down fragmented insert took 20 msecs
[ 56.107177] drm_mm: evict fragmented insert took 4 msecs
<snip>
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxx>
---
drivers/gpu/drm/selftests/drm_mm_selftests.h | 1 +
drivers/gpu/drm/selftests/test-drm_mm.c | 59 ++++++++++++++++++++
2 files changed, 60 insertions(+)
diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index 6b943ea1c57d..8c87c964176b 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -14,6 +14,7 @@ selftest(insert, igt_insert)
selftest(replace, igt_replace)
selftest(insert_range, igt_insert_range)
selftest(align, igt_align)
+selftest(frag, igt_frag)
selftest(align32, igt_align32)
selftest(align64, igt_align64)
selftest(evict, igt_evict)
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 9aabe82dcd3a..4c08ca86bb86 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -1033,6 +1033,65 @@ static int igt_insert_range(void *ignored)
return 0;
}
+static int igt_frag(void *ignored)
+{
+ const struct insert_mode *mode;
+ struct drm_mm mm;
+ struct drm_mm_node *nodes, *node, *next;
+ unsigned int size = 4096, align = 8192;
+ unsigned long start, timeout = 1000;
+ const unsigned int max_count = 10000;
+ unsigned int i;
+ int ret = -EINVAL;
+
+ /* For each of the possible insertion modes, we pass an size, alignment
+ * value that is known to introduce fragmentation and check that it
+ * doesn't take more than 1 sec.
+ */
+
+ nodes = vzalloc(array_size(max_count, sizeof(*nodes)));
+ if (!nodes)
+ goto err;
+
+ drm_mm_init(&mm, 1, U64_MAX - 2);
+
+ for (mode = insert_modes; mode->name; mode++) {
+ start = jiffies;
+
+ for (i = 0; i < max_count; i++) {
+ if (jiffies_to_msecs(jiffies - start) >= timeout) {
+ pr_err("%s fragmented insert took more than %lu msecs\n",
+ mode->name, timeout);
+ goto out;
+ }
+
+ if (!expect_insert(&mm, &nodes[i],
+ size, align, i, mode)) {
+ pr_err("%s insert failed with alignment=%d",
+ mode->name, align);
+ goto out;
+ }
+ }
+
+ pr_info("%s fragmented insert took %d msecs\n",
+ mode->name, jiffies_to_msecs(jiffies - start));
+ drm_mm_for_each_node_safe(node, next, &mm)
+ drm_mm_remove_node(node);
+ DRM_MM_BUG_ON(!drm_mm_clean(&mm));
+
+ cond_resched();
+ }
+
+ 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 igt_align(void *ignored)
{
const struct insert_mode *mode;
--
2.26.2
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