[PATCH v2 4/4] nitro_enclaves: add kunit tests for physical contiguous region merging

[Longpeng(Mike)]

Add kunit tests for the physical contiguous memory region merging
functionality.

Signed-off-by: Longpeng(Mike) <longpeng2@xxxxxxxxxx>
---
 drivers/virt/nitro_enclaves/ne_misc_test.c | 46 ++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/virt/nitro_enclaves/ne_misc_test.c b/drivers/virt/nitro_enclaves/ne_misc_test.c
index 3426c35..8532bec 100644
--- a/drivers/virt/nitro_enclaves/ne_misc_test.c
+++ b/drivers/virt/nitro_enclaves/ne_misc_test.c
@@ -2,7 +2,53 @@
 
 #include <kunit/test.h>
 
+#define MAX_PHYS_REGIONS	16
+
+struct phys_regions_test {
+	u64 paddr;
+	u64 size;
+	int expect_rc;
+	unsigned long expect_num;
+	u64 expect_last_paddr;
+	u64 expect_last_size;
+} phys_regions_testcases[] = {
+	{0x1000, 0x200000, -EINVAL, 0, ~0, ~0},
+	{0x200000, 0x1000, -EINVAL, 0, ~0, ~0},
+	{0x200000, 0x200000, 0, 1, 0x200000, 0x200000},
+	{0x0, 0x200000, 0, 2, 0x0, 0x200000},
+	{0x600000, 0x400000, 0, 3, 0x600000, 0x400000},
+	{0xa00000, 0x400000, 0, 3, 0x600000, 0x800000},
+	{0x1000, 0x200000, -EINVAL, 3, 0x600000, 0x800000},
+};
+
+static void ne_misc_test_set_phys_region(struct kunit *test)
+{
+	struct phys_contig_mem_region *regions;
+	size_t sz;
+	int i, rc;
+
+	sz = sizeof(*regions) + MAX_PHYS_REGIONS * sizeof(struct phys_mem_region);
+	regions = kunit_kzalloc(test, sz, GFP_KERNEL);
+	KUNIT_ASSERT_TRUE(test, regions != NULL);
+
+	for (i = 0; i < ARRAY_SIZE(phys_regions_testcases); i++) {
+		rc = ne_add_phys_memory_region(regions, phys_regions_testcases[i].paddr,
+					       phys_regions_testcases[i].size);
+		KUNIT_EXPECT_EQ(test, rc, phys_regions_testcases[i].expect_rc);
+		KUNIT_EXPECT_EQ(test, regions->num, phys_regions_testcases[i].expect_num);
+
+		if (phys_regions_testcases[i].expect_last_paddr == ~0ul)
+			continue;
+
+		KUNIT_EXPECT_EQ(test, regions->region[regions->num - 1].paddr,
+				phys_regions_testcases[i].expect_last_paddr);
+		KUNIT_EXPECT_EQ(test, regions->region[regions->num - 1].size,
+				phys_regions_testcases[i].expect_last_size);
+	}
+}
+
 static struct kunit_case ne_misc_test_cases[] = {
+	KUNIT_CASE(ne_misc_test_set_phys_region),
 	{}
 };
 
-- 
1.8.3.1