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authorShaoqin Huang <shaoqin.huang@intel.com>2022-10-11 08:21:21 +0200
committerMike Rapoport <rppt@linux.ibm.com>2022-10-31 09:15:00 +0100
commit5b27dd7968b9c916da4af48d0310f94152744f8e (patch)
tree4aa0f0e7020c65dd727f50484da29345ca3bb947 /tools/testing/memblock
parentmemblock test: Add test to memblock_add() 129th region (diff)
downloadlinux-5b27dd7968b9c916da4af48d0310f94152744f8e.tar.xz
linux-5b27dd7968b9c916da4af48d0310f94152744f8e.zip
memblock test: Add test to memblock_reserve() 129th region
Reserve 129th region in the memblock, and this will trigger the memblock_double_array() function, this needs valid memory regions. So using dummy_physical_memory_init() to allocate a valid memory region. At the same time, reserve 128 faked memory region, and make sure these reserved region not intersect with the valid memory region. So memblock_double_array() will choose the valid memory region, and it will success. Also need to restore the reserved.regions after memblock_double_array(), to make sure the subsequent tests can run as normal. Signed-off-by: Shaoqin Huang <shaoqin.huang@intel.com> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Link: https://lore.kernel.org/r/20221011062128.49359-3-shaoqin.huang@intel.com
Diffstat (limited to 'tools/testing/memblock')
-rw-r--r--tools/testing/memblock/tests/basic_api.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/tools/testing/memblock/tests/basic_api.c b/tools/testing/memblock/tests/basic_api.c
index 4d61a4b474be..411647094cc3 100644
--- a/tools/testing/memblock/tests/basic_api.c
+++ b/tools/testing/memblock/tests/basic_api.c
@@ -892,6 +892,96 @@ static int memblock_reserve_near_max_check(void)
return 0;
}
+/*
+ * A test that trying to reserve the 129th memory block.
+ * Expect to trigger memblock_double_array() to double the
+ * memblock.memory.max, find a new valid memory as
+ * reserved.regions.
+ */
+static int memblock_reserve_many_check(void)
+{
+ int i;
+ void *orig_region;
+ struct region r = {
+ .base = SZ_16K,
+ .size = SZ_16K,
+ };
+ phys_addr_t memory_base = SZ_128K;
+ phys_addr_t new_reserved_regions_size;
+
+ PREFIX_PUSH();
+
+ 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; i++) {
+ /* Reserve some fakes memory region to fulfill the memblock. */
+ memblock_reserve(memory_base, MEM_SIZE);
+
+ ASSERT_EQ(memblock.reserved.cnt, i + 1);
+ ASSERT_EQ(memblock.reserved.total_size, (i + 1) * MEM_SIZE);
+
+ /* Keep the gap so these memory region will not be merged. */
+ memory_base += MEM_SIZE * 2;
+ }
+
+ orig_region = memblock.reserved.regions;
+
+ /* This reserve the 129 memory_region, and makes it double array. */
+ memblock_reserve(memory_base, 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();
@@ -906,6 +996,7 @@ static int memblock_reserve_checks(void)
memblock_reserve_twice_check();
memblock_reserve_between_check();
memblock_reserve_near_max_check();
+ memblock_reserve_many_check();
prefix_pop();