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    <div class="moz-cite-prefix">On 2/8/2024 8:06 PM, Matthew Auld
      wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:20240208143618.247048-2-matthew.auld@intel.com">
      <pre class="moz-quote-pre" wrap="">Sanity check DRM_BUDDY_CONTIGUOUS_ALLOCATION.</pre>
    </blockquote>
    That's really quick :)<br>
    <p style="margin:0in;font-family:Calibri;font-size:11.0pt">Reviewed-by:
      Arunpravin Paneer Selvam <<a href="mailto:Arunpravin.PaneerSelvam@amd.com" class="moz-txt-link-freetext">Arunpravin.PaneerSelvam@amd.com</a>></p>
    <blockquote type="cite" cite="mid:20240208143618.247048-2-matthew.auld@intel.com">
      <pre class="moz-quote-pre" wrap="">

References: <a class="moz-txt-link-freetext" href="https://gitlab.freedesktop.org/drm/amd/-/issues/3097">https://gitlab.freedesktop.org/drm/amd/-/issues/3097</a>
Signed-off-by: Matthew Auld <a class="moz-txt-link-rfc2396E" href="mailto:matthew.auld@intel.com"><matthew.auld@intel.com></a>
Cc: Arunpravin Paneer Selvam <a class="moz-txt-link-rfc2396E" href="mailto:Arunpravin.PaneerSelvam@amd.com"><Arunpravin.PaneerSelvam@amd.com></a>
Cc: Limonciello <a class="moz-txt-link-rfc2396E" href="mailto:mario.limonciello@amd.com"><mario.limonciello@amd.com></a>
Cc: Christian König <a class="moz-txt-link-rfc2396E" href="mailto:christian.koenig@amd.com"><christian.koenig@amd.com></a>
---
 drivers/gpu/drm/tests/drm_buddy_test.c | 89 ++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_buddy_test.c b/drivers/gpu/drm/tests/drm_buddy_test.c
index ea2af6bd9abe..4215d8b5fcf0 100644
--- a/drivers/gpu/drm/tests/drm_buddy_test.c
+++ b/drivers/gpu/drm/tests/drm_buddy_test.c
@@ -8,6 +8,7 @@
 
 #include <linux/prime_numbers.h>
 #include <linux/sched/signal.h>
+#include <linux/sizes.h>
 
 #include <drm/drm_buddy.h>
 
@@ -18,6 +19,93 @@ static inline u64 get_size(int order, u64 chunk_size)
        return (1 << order) * chunk_size;
 }
 
+static void drm_test_buddy_alloc_contiguous(struct kunit *test)
+{
+       u64 mm_size, ps = SZ_4K, i, n_pages, total;
+       struct drm_buddy_block *block;
+       struct drm_buddy mm;
+       LIST_HEAD(left);
+       LIST_HEAD(middle);
+       LIST_HEAD(right);
+       LIST_HEAD(allocated);
+
+       mm_size = 16 * 3 * SZ_4K;
+
+       KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, mm_size, ps));
+
+       /*
+        * Idea is to fragment the address space by alternating block
+        * allocations between three different lists; one for left, middle and
+        * right. We can then free a list to simulate fragmentation. In
+        * particular we want to exercise the DRM_BUDDY_CONTIGUOUS_ALLOCATION,
+        * including the try_harder path.
+        */
+
+       i = 0;
+       n_pages = mm_size / ps;
+       do {
+               struct list_head *list;
+               int slot = i % 3;
+
+               if (slot == 0)
+                       list = &left;
+               else if (slot == 1)
+                       list = &middle;
+               else
+                       list = &right;
+               KUNIT_ASSERT_FALSE_MSG(test,
+                                      drm_buddy_alloc_blocks(&mm, 0, mm_size,
+                                                             ps, ps, list, 0),
+                                      "buddy_alloc hit an error size=%d\n",
+                                      ps);
+       } while (++i < n_pages);
+
+       KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
+                                                          3 * ps, ps, &allocated,
+                                                          DRM_BUDDY_CONTIGUOUS_ALLOCATION),
+                              "buddy_alloc didn't error size=%d\n", 3 * ps);
+
+       drm_buddy_free_list(&mm, &middle);
+       KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
+                                                          3 * ps, ps, &allocated,
+                                                          DRM_BUDDY_CONTIGUOUS_ALLOCATION),
+                              "buddy_alloc didn't error size=%llu\n", 3 * ps);
+       KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
+                                                          2 * ps, ps, &allocated,
+                                                          DRM_BUDDY_CONTIGUOUS_ALLOCATION),
+                              "buddy_alloc didn't error size=%llu\n", 2 * ps);
+
+       drm_buddy_free_list(&mm, &right);
+       KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
+                                                          3 * ps, ps, &allocated,
+                                                          DRM_BUDDY_CONTIGUOUS_ALLOCATION),
+                              "buddy_alloc didn't error size=%llu\n", 3 * ps);
+       /*
+        * At this point we should have enough contiguous space for 2 blocks,
+        * however they are never buddies (since we freed middle and right) so
+        * will require the try_harder logic to find them.
+        */
+       KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
+                                                          2 * ps, ps, &allocated,
+                                                          DRM_BUDDY_CONTIGUOUS_ALLOCATION),
+                              "buddy_alloc hit an error size=%d\n", 2 * ps);
+
+       drm_buddy_free_list(&mm, &left);
+       KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
+                                                          3 * ps, ps, &allocated,
+                                                          DRM_BUDDY_CONTIGUOUS_ALLOCATION),
+                              "buddy_alloc hit an error size=%d\n", 3 * ps);
+
+       total = 0;
+       list_for_each_entry(block, &allocated, link)
+               total += drm_buddy_block_size(&mm, block);
+
+       KUNIT_ASSERT_EQ(test, total, ps * 2 + ps * 3);
+
+       drm_buddy_free_list(&mm, &allocated);
+       drm_buddy_fini(&mm);
+}
+
 static void drm_test_buddy_alloc_pathological(struct kunit *test)
 {
        u64 mm_size, size, start = 0;
@@ -280,6 +368,7 @@ static struct kunit_case drm_buddy_tests[] = {
        KUNIT_CASE(drm_test_buddy_alloc_optimistic),
        KUNIT_CASE(drm_test_buddy_alloc_pessimistic),
        KUNIT_CASE(drm_test_buddy_alloc_pathological),
+       KUNIT_CASE(drm_test_buddy_alloc_contiguous),
        {}
 };
 
</pre>
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