Re: [PATCH 8/8] memblock tests: add tests for memblock_trim_memory

[Huang, Shaoqin]

On 8/14/2022 1:54 PM, Rebecca Mckeever wrote:
> Add tests for memblock_trim_memory() for the following scenarios:
> - all regions aligned
> - one region unalign that is smaller than the alignment
> - one region unaligned at the base
> - one region unaligned at the end
>
> Signed-off-by: Rebecca Mckeever <remckee0@xxxxxxxxx>
> ---
>   tools/testing/memblock/tests/basic_api.c | 223 +++++++++++++++++++++++
>   1 file changed, 223 insertions(+)
>
> diff --git a/tools/testing/memblock/tests/basic_api.c b/tools/testing/memblock/tests/basic_api.c
> index d7f008e7a12a..c8bb44f20846 100644
> --- a/tools/testing/memblock/tests/basic_api.c
> +++ b/tools/testing/memblock/tests/basic_api.c
> @@ -8,6 +8,7 @@
>   #define FUNC_RESERVE					"memblock_reserve"
>   #define FUNC_REMOVE					"memblock_remove"
>   #define FUNC_FREE					"memblock_free"
> +#define FUNC_TRIM					"memblock_trim_memory"
>   
>   static int memblock_initialization_check(void)
>   {
> @@ -1723,6 +1724,227 @@ static int memblock_bottom_up_checks(void)
>   	return 0;
>   }
>   
> +/*
> + * A test that tries to trim memory when both ends of the memory region are
> + * aligned. Expect that the memory will not be trimmed. Expect the counter to
> + * not be updated.
> + */
> +static int memblock_trim_memory_aligned_check(void)
> +{
> +	struct memblock_region *rgn;
> +	phys_addr_t alignment = SMP_CACHE_BYTES;
> +
> +	rgn = &memblock.memory.regions[0];
> +
> +	struct region r = {
> +		.base = alignment,
> +		.size = alignment * 4
> +	};
> +
> +	PREFIX_PUSH();
> +
> +	reset_memblock_regions();
> +	memblock_add(r.base, r.size);
> +	memblock_trim_memory(alignment);
> +
> +	ASSERT_EQ(rgn->base, r.base);
> +	ASSERT_EQ(rgn->size, r.size);
> +
> +	ASSERT_EQ(memblock.memory.cnt, 1);
> +
> +	test_pass_pop();
> +
> +	return 0;
> +}
> +
> +/*
> + * A test that tries to trim memory when there are two available regions, r1 and
> + * r2. Region r1 is aligned on both ends and region r2 is unaligned on one end
> + * and smaller than the alignment:
> + *
> + *                                     alignment
> + *                                     |--------|
> + * |        +-----------------+        +------+   |
> + * |        |        r1       |        |  r2  |   |
> + * +--------+-----------------+--------+------+---+
> + *          ^        ^        ^        ^      ^
> + *          |________|________|________|      |
> + *                            |               Unaligned address
> + *                Aligned addresses
> + *
> + * Expect that r1 will not be trimmed and r2 will be removed. Expect the
> + * counter to be updated.
> + */
> +static int memblock_trim_memory_too_small_check(void)
> +{
> +	struct memblock_region *rgn;
> +	phys_addr_t alignment = SMP_CACHE_BYTES;
> +
> +	rgn = &memblock.memory.regions[0];
> +
> +	struct region r1 = {
> +		.base = alignment,
> +		.size = alignment * 2
> +	};
> +	struct region r2 = {
> +		.base = alignment * 4,
> +		.size = alignment - SZ_2
> +	};
> +
> +	PREFIX_PUSH();
> +
> +	reset_memblock_regions();
> +	memblock_add(r1.base, r1.size);
> +	memblock_add(r2.base, r2.size);
> +	memblock_trim_memory(alignment);
> +
> +	ASSERT_EQ(rgn->base, r1.base);
> +	ASSERT_EQ(rgn->size, r1.size);
> +
> +	ASSERT_EQ(memblock.memory.cnt, 1);
> +
> +	test_pass_pop();
> +
> +	return 0;
> +}
> +
> +/*
> + * A test that tries to trim memory when there are two available regions, r1 and
> + * r2. Region r1 is aligned on both ends and region r2 is unaligned at the base
> + * and aligned at the end:
> + *
> + *                               Unaligned address
> + *                                       |
> + *                                       v
> + * |        +-----------------+          +---------------+   |
> + * |        |        r1       |          |      r2       |   |
> + * +--------+-----------------+----------+---------------+---+
> + *          ^        ^        ^        ^        ^        ^
> + *          |________|________|________|________|________|
> + *                            |
> + *                    Aligned addresses
> + *
> + * Expect that r1 will not be trimmed and r2 will be trimmed at the base.
> + * Expect the counter to not be updated.
> + */
> +static int memblock_trim_memory_unaligned_base_check(void)
> +{
> +	struct memblock_region *rgn1, *rgn2;
> +	phys_addr_t alignment = SMP_CACHE_BYTES;
> +	phys_addr_t offset = SZ_2;
> +	phys_addr_t r2_base, r2_size;
> +
> +	rgn1 = &memblock.memory.regions[0];
> +	rgn2 = &memblock.memory.regions[1];
> +
> +	struct region r1 = {
> +		.base = alignment,
> +		.size = alignment * 2
> +	};
> +	struct region r2 = {
> +		.base = alignment * 4 + offset,
> +		.size = alignment * 2 - offset
> +	};
> +
> +	PREFIX_PUSH();
> +
> +	r2_base = r2.base + (alignment - offset);
> +	r2_size = r2.size - (alignment - offset);

Also the variable name.

> +
> +	reset_memblock_regions();
> +	memblock_add(r1.base, r1.size);
> +	memblock_add(r2.base, r2.size);
> +	memblock_trim_memory(alignment);
> +
> +	ASSERT_EQ(rgn1->base, r1.base);
> +	ASSERT_EQ(rgn1->size, r1.size);
> +
> +	ASSERT_EQ(rgn2->base, r2_base);
> +	ASSERT_EQ(rgn2->size, r2_size);
> +
> +	ASSERT_EQ(memblock.memory.cnt, 2);
> +
> +	test_pass_pop();
> +
> +	return 0;
> +}
> +
> +/*
> + * A test that tries to trim memory when there are two available regions, r1 and
> + * r2. Region r1 is aligned on both ends and region r2 is aligned at the base
> + * and unaligned at the end:
> + *
> + *                                             Unaligned address
> + *                                                     |
> + *                                                     v
> + * |        +-----------------+        +---------------+   |
> + * |        |        r1       |        |      r2       |   |
> + * +--------+-----------------+--------+---------------+---+
> + *          ^        ^        ^        ^        ^        ^
> + *          |________|________|________|________|________|
> + *                            |
> + *                    Aligned addresses
> + *
> + * Expect that r1 will not be trimmed and r2 will be trimmed at the base.
								^
							at the end.
> + * Expect the counter to not be updated.
> + */
> +static int memblock_trim_memory_unaligned_end_check(void)
> +{
> +	struct memblock_region *rgn1, *rgn2;
> +	phys_addr_t alignment = SMP_CACHE_BYTES;
> +	phys_addr_t offset = SZ_2;
> +	phys_addr_t r2_size;
> +
> +	rgn1 = &memblock.memory.regions[0];
> +	rgn2 = &memblock.memory.regions[1];
> +
> +	struct region r1 = {
> +		.base = alignment,
> +		.size = alignment * 2
> +	};
> +	struct region r2 = {
> +		.base = alignment * 4,
> +		.size = alignment * 2 - offset
> +	};
> +
> +	PREFIX_PUSH();
> +
> +	r2_size = r2.size - (alignment - offset);
> +
> +	reset_memblock_regions();
> +	memblock_add(r1.base, r1.size);
> +	memblock_add(r2.base, r2.size);
> +	memblock_trim_memory(alignment);
> +
> +	ASSERT_EQ(rgn1->base, r1.base);
> +	ASSERT_EQ(rgn1->size, r1.size);
> +
> +	ASSERT_EQ(rgn2->base, r2.base);
> +	ASSERT_EQ(rgn2->size, r2_size);
> +
> +	ASSERT_EQ(memblock.memory.cnt, 2);
> +
> +	test_pass_pop();
> +
> +	return 0;
> +}
> +
> +static int memblock_trim_memory_checks(void)
> +{
> +	prefix_reset();
> +	prefix_push(FUNC_TRIM);
> +	test_print("Running %s tests...\n", FUNC_TRIM);
> +
> +	memblock_trim_memory_aligned_check();
> +	memblock_trim_memory_too_small_check();
> +	memblock_trim_memory_unaligned_base_check();
> +	memblock_trim_memory_unaligned_end_check();
> +
> +	prefix_pop();
> +
> +	return 0;
> +}
> +
>   int memblock_basic_checks(void)
>   {
>   	memblock_initialization_check();
> @@ -1731,6 +1953,7 @@ int memblock_basic_checks(void)
>   	memblock_remove_checks();
>   	memblock_free_checks();
>   	memblock_bottom_up_checks();
> +	memblock_trim_memory_checks();
>   
>   	return 0;
>   }

Others looks good.