Instead of adding 129th memory block at the last position, let's try all
possible position.
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
---
tools/testing/memblock/tests/basic_api.c | 107 +++++++++++++++++++++++
1 file changed, 107 insertions(+)
diff --git a/tools/testing/memblock/tests/basic_api.c b/tools/testing/memblock/tests/basic_api.c
index f317fe691fc4..bd3ebbf6b697 100644
--- a/tools/testing/memblock/tests/basic_api.c
+++ b/tools/testing/memblock/tests/basic_api.c
@@ -982,6 +982,112 @@ static int memblock_reserve_many_check(void)
return 0;
}
+
+/*
+ * A test that trying to reserve the 129th memory block at all locations.
+ * Expect to trigger memblock_double_array() to double the
+ * memblock.memory.max, find a new valid memory as reserved.regions.
+ *
+ * 0 1 2 128
+ * +-------+ +-------+ +-------+ +-------+
+ * | 32K | | 32K | | 32K | ... | 32K |
+ * +-------+-------+-------+-------+-------+ +-------+
+ * |<-32K->| |<-32K->|
+ *
+ */
+/* Keep the gap so these memory region will not be merged. */
+#define MEMORY_BASE(idx) (SZ_128K + (MEM_SIZE * 2) * (idx))
+static int memblock_reserve_all_locations_check(void)
+{
+ int i, skip;
+ void *orig_region;
+ struct region r = {
+ .base = SZ_16K,
+ .size = SZ_16K,
+ };
+ phys_addr_t new_reserved_regions_size;
+
+ PREFIX_PUSH();
+
+ /* Reserve the 129th memory block for all possible positions*/
+ for (skip = 0; skip < INIT_MEMBLOCK_REGIONS + 1; skip++) {
+ reset_memblock_regions();
+ memblock_allow_resize();
+
+ /* Add a valid memory region used by double_array(). */
+ dummy_physical_memory_init();
+ memblock_add(dummy_physical_memory_base(), MEM_SIZE);
+
+ for (i = 0; i < INIT_MEMBLOCK_REGIONS + 1; i++) {
+ if (i == skip)
+ continue;
+
+ /* Reserve some fakes memory region to fulfill the memblock. */
+ memblock_reserve(MEMORY_BASE(i), MEM_SIZE);
+
+ if (i < skip) {
+ ASSERT_EQ(memblock.reserved.cnt, i + 1);
+ ASSERT_EQ(memblock.reserved.total_size, (i + 1) * MEM_SIZE);
+ } else {
+ ASSERT_EQ(memblock.reserved.cnt, i);
+ ASSERT_EQ(memblock.reserved.total_size, i * MEM_SIZE);
+ }
+ }
+
+ orig_region = memblock.reserved.regions;
+
+ /* This reserve the 129 memory_region, and makes it double array. */
+ memblock_reserve(MEMORY_BASE(skip), MEM_SIZE);
+
+ /*
+ * This is the memory region size used by the doubled reserved.regions,
+ * and it has been reserved due to it has been used. The size is used to
+ * calculate the total_size that the memblock.reserved have now.
+ */
+ new_reserved_regions_size = PAGE_ALIGN((INIT_MEMBLOCK_REGIONS * 2) *
+ sizeof(struct memblock_region));
+ /*
+ * The double_array() will find a free memory region as the new
+ * reserved.regions, and the used memory region will be reserved, so
+ * there will be one more region exist in the reserved memblock. And the
+ * one more reserved region's size is new_reserved_regions_size.
+ */
+ ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 2);
+ ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
+ new_reserved_regions_size);
+ ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
+
+ /*
+ * Now memblock_double_array() works fine. Let's check after the
+ * double_array(), the memblock_reserve() still works as normal.
+ */
+ memblock_reserve(r.base, r.size);
+ ASSERT_EQ(memblock.reserved.regions[0].base, r.base);
+ ASSERT_EQ(memblock.reserved.regions[0].size, r.size);
+
+ ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 3);
+ ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
+ new_reserved_regions_size +
+ r.size);
+ ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
+
+ dummy_physical_memory_cleanup();
+
+ /*
+ * The current reserved.regions is occupying a range of memory that
+ * allocated from dummy_physical_memory_init(). After free the memory,
+ * we must not use it. So restore the origin memory region to make sure
+ * the tests can run as normal and not affected by the double array.
+ */
+ memblock.reserved.regions = orig_region;
+ memblock.reserved.cnt = INIT_MEMBLOCK_RESERVED_REGIONS;
+ }
+
+ test_pass_pop();
+
+ return 0;
+}
+
static int memblock_reserve_checks(void)
{
prefix_reset();
@@ -997,6 +1103,7 @@ static int memblock_reserve_checks(void)
memblock_reserve_between_check();
memblock_reserve_near_max_check();
memblock_reserve_many_check();
+ memblock_reserve_all_locations_check();
prefix_pop();
--
2.34.1
