Re: [PATCH V4 2/2] gpu/tests/gpu_buddy: Add KUnit test for gpu_buddy_allocated_addr_to_block

On 8/6/2026 4:48 PM, Upadhyay, Tejas wrote:
>
>> -----Original Message-----
>> From: Arunpravin Paneer Selvam <[email protected]>
>> Sent: 06 August 2026 16:43
>> To: Auld, Matthew <[email protected]>; Upadhyay, Tejas
>> <[email protected]>; [email protected]; dri-
>> [email protected]
>> Subject: Re: [PATCH V4 2/2] gpu/tests/gpu_buddy: Add KUnit test for
>> gpu_buddy_allocated_addr_to_block
>>
>>
>>
>> On 8/6/2026 3:49 PM, Matthew Auld wrote:
>>> On 06/08/2026 10:46, Upadhyay, Tejas wrote:
>>>>
>>>>> -----Original Message-----
>>>>> From: Auld, Matthew <[email protected]>
>>>>> Sent: 06 August 2026 14:31
>>>>> To: Upadhyay, Tejas <[email protected]>; intel-
>>>>> [email protected]; [email protected]
>>>>> Cc: [email protected]
>>>>> Subject: Re: [PATCH V4 2/2] gpu/tests/gpu_buddy: Add KUnit test for
>>>>> gpu_buddy_allocated_addr_to_block
>>>>>
>>>>> On 06/08/2026 06:36, Tejas Upadhyay wrote:
>>>>>> Add a new KUnit test gpu_test_buddy_addr_to_block() that validates
>>>>>> the
>>>>>> gpu_buddy_allocated_addr_to_block() helper which traces a address
>>>>>> back to its allocated buddy block.
>>>>>>
>>>>>> The test covers:
>>>>>> - Exact address matching returns the correct allocated block
>>>>>> - An unallocated address inside the manager should return NULL
>>>>>> - An address outside the manager should return -ENXIO
>>>>>>
>>>>>> v4(MattA):
>>>>>> - Add test for unaligned address
>>>>>> v3(Sashiko):
>>>>>> - remove unused target_addr variable
>>>>>> v2(Sashiko):
>>>>>> - Drop the mutex and lockdep annotation; standalone KUnit tests do
>>>>>>      not register a driver lock.
>>>>>>
>>>>>> Signed-off-by: Tejas Upadhyay <[email protected]>
>>>>> Reviewed-by: Matthew Auld <[email protected]>
>>>> Hi Matt,
>>>>
>>>> Thanks for review. Since I don’t have merge rights on drm-tip, Would
>>>> you please help merging this series.
>>> I think Arun normally merges these. Arun, any objections? We need this
>>> for an upcoming driver feature (patches on the list), so wanted to
>>> land this API ahead of time. I don't think this will conflict much
>>> with the big rework you were doing.
>> No objections. Do you want me to merge the series below into drm-misc-
>> next?
>>
>> https://patchwork.freedesktop.org/series/171145/
> Thanks. Yes, you pointed to the right series.
Done. Merged into drm-misc-next.
>
> Tejas
>> Regards,
>> Arun.
>>>> Tejas
>>>>>> ---
>>>>>>     drivers/gpu/tests/gpu_buddy_test.c | 45
>>>>> ++++++++++++++++++++++++++++++
>>>>>>     1 file changed, 45 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/gpu/tests/gpu_buddy_test.c
>>>>>> b/drivers/gpu/tests/gpu_buddy_test.c
>>>>>> index 7df5c2ae83bb..04e425eb8bdd 100644
>>>>>> --- a/drivers/gpu/tests/gpu_buddy_test.c
>>>>>> +++ b/drivers/gpu/tests/gpu_buddy_test.c
>>>>>> @@ -1381,6 +1381,50 @@ static void
>>>>> gpu_test_buddy_alloc_exceeds_max_order(struct kunit *test)
>>>>>>         gpu_buddy_fini(&mm);
>>>>>>     }
>>>>>>
>>>>>> +static void gpu_test_buddy_addr_to_block(struct kunit *test) {
>>>>>> +    struct gpu_buddy_block *allocated_block, *found_block;
>>>>>> +    LIST_HEAD(allocated_list);
>>>>>> +    const u64 test_size = SZ_4M + SZ_2M;
>>>>>> +    const u64 alloc_start = SZ_4M;
>>>>>> +    const u64 alloc_size = SZ_4K;
>>>>>> +    const u64 chunk_size = SZ_4K;
>>>>>> +    struct gpu_buddy mm;
>>>>>> +
>>>>>> +    KUNIT_ASSERT_FALSE_MSG(test, gpu_buddy_init(&mm, test_size,
>>>>> chunk_size),
>>>>>> +                   "buddy_init failed\n");
>>>>>> +
>>>>>> +    KUNIT_ASSERT_FALSE_MSG(test, gpu_buddy_alloc_blocks(&mm,
>>>>> alloc_start,
>>>>>> + alloc_start +
>>>>> alloc_size,
>>>>>> + alloc_size,
>>>>> chunk_size,
>>>>>> + &allocated_list, 0),
>>>>>> +                   "buddy_alloc failed\n");
>>>>>> +
>>>>>> +    allocated_block = list_first_entry(&allocated_list, struct
>>>>> gpu_buddy_block, link);
>>>>>> +    KUNIT_EXPECT_EQ(test, gpu_buddy_block_offset(allocated_block),
>>>>> alloc_start);
>>>>>> +    KUNIT_EXPECT_EQ(test, gpu_buddy_block_size(&mm,
>>>>> allocated_block),
>>>>>> +alloc_size);
>>>>>> +
>>>>>> +    found_block = gpu_buddy_allocated_addr_to_block(&mm,
>>>>> alloc_start);
>>>>>> +    KUNIT_EXPECT_PTR_EQ(test, found_block, allocated_block);
>>>>>> +
>>>>>> +    /* Unaligned address inside the allocated block (should
>>>>>> resolve to the
>>>>> same block) */
>>>>>> +    found_block = gpu_buddy_allocated_addr_to_block(&mm,
>>>>>> +alloc_start
>>>>> + 16);
>>>>>> +    KUNIT_EXPECT_PTR_EQ(test, found_block, allocated_block);
>>>>>> +
>>>>>> +    /* An unallocated address inside the manager should return
>>>>>> NULL. */
>>>>>> +    found_block = gpu_buddy_allocated_addr_to_block(&mm,
>>>>>> +                            alloc_start -
>>>>> chunk_size);
>>>>>> +    KUNIT_EXPECT_NULL(test, found_block);
>>>>>> +
>>>>>> +    /* An address outside the manager should return -ENXIO. */
>>>>>> +    found_block = gpu_buddy_allocated_addr_to_block(&mm,
>>>>>> +test_size);
>>>>>> +    KUNIT_EXPECT_EQ(test, PTR_ERR(found_block), -ENXIO);
>>>>>> +
>>>>>> +    /* 3. Standard inline cleanup flow */
>>>>>> +    gpu_buddy_free_list(&mm, &allocated_list, 0);
>>>>>> +    gpu_buddy_fini(&mm);
>>>>>> +}
>>>>>> +
>>>>>>     static int gpu_buddy_suite_init(struct kunit_suite *suite)
>>>>>>     {
>>>>>>         while (!random_seed)
>>>>>> @@ -1405,6 +1449,7 @@ static struct kunit_case gpu_buddy_tests[] =
>>>>>> {
>>>>>>         KUNIT_CASE(gpu_test_buddy_alloc_exceeds_max_order),
>>>>>>         KUNIT_CASE(gpu_test_buddy_offset_aligned_allocation),
>>>>>> KUNIT_CASE(gpu_test_buddy_subtree_offset_alignment_stress),
>>>>>> +    KUNIT_CASE(gpu_test_buddy_addr_to_block),
>>>>>>         {}
>>>>>>     };
>>>>>>