tests: Add lib/imd-test test case

Implement unit tests for src/lib/imd.c module.

Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Signed-off-by: Anna Karas <aka@semihalf.com>
Signed-off-by: Jan Dabros <jsd@semihalf.com>
Change-Id: I3902f8638669440144064ce0e3756918338f4068
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46457
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 768 insertions, 0 deletions

diff --git a/tests/lib/Makefile.inc b/tests/lib/Makefile.inc
index b66d386787..3062bcaa70 100644
--- a/tests/lib/Makefile.inc
+++ b/tests/lib/Makefile.inc
@@ -3,6 +3,7 @@
 tests-y += string-test
 tests-y += b64_decode-test
 tests-y += hexstrtobin-test
+tests-y += imd-test
 
 string-test-srcs += tests/lib/string-test.c
 string-test-srcs += src/lib/string.c
@@ -13,3 +14,7 @@ b64_decode-test-srcs += src/lib/b64_decode.c
 
 hexstrtobin-test-srcs += tests/lib/hexstrtobin-test.c
 hexstrtobin-test-srcs += src/lib/hexstrtobin.c
+
+imd-test-srcs += tests/lib/imd-test.c
+imd-test-srcs += tests/stubs/console.c
+imd-test-srcs += src/lib/imd.c
\ No newline at end of file
diff --git a/tests/lib/imd-test.c b/tests/lib/imd-test.c
new file mode 100644
index 0000000000..dce542cf8f
--- /dev/null
+++ b/tests/lib/imd-test.c
@@ -0,0 +1,763 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <stdlib.h>
+#include <types.h>
+#include <string.h>
+#include <tests/test.h>
+#include <imd.h>
+#include <imd_private.h>
+#include <cbmem.h>
+#include <commonlib/bsd/helpers.h>
+#include <lib.h>
+
+/* Auxiliary functions and definitions. */
+
+#define LG_ROOT_SIZE align_up_pow2(sizeof(struct imd_root_pointer) +\
+	 sizeof(struct imd_root) + 3 * sizeof(struct imd_entry))
+#define LG_ENTRY_ALIGN (2 * sizeof(int32_t))
+#define LG_ENTRY_SIZE (2 * sizeof(int32_t))
+#define LG_ENTRY_ID 0xA001
+
+#define SM_ROOT_SIZE LG_ROOT_SIZE
+#define SM_ENTRY_ALIGN sizeof(uint32_t)
+#define SM_ENTRY_SIZE sizeof(uint32_t)
+#define SM_ENTRY_ID 0xB001
+
+#define INVALID_REGION_ID 0xC001
+
+static uint32_t align_up_pow2(uint32_t x)
+{
+	return (1 << log2_ceil(x));
+}
+
+static size_t max_entries(size_t root_size)
+{
+	return (root_size - sizeof(struct imd_root_pointer) - sizeof(struct imd_root))
+			/ sizeof(struct imd_entry);
+}
+
+/*
+ * Mainly, we should check that imd_handle_init() aligns upper_limit properly
+ * for various inputs. Upper limit is the _exclusive_ address, so we expect
+ * ALIGN_DOWN.
+ */
+static void test_imd_handle_init(void **state)
+{
+	int i;
+	void *base;
+	struct imd imd;
+	uintptr_t test_inputs[] = {
+			0,                   /* Lowest possible address */
+			0xA000,              /* Fits in 16 bits, should not get rounded down*/
+			0xDEAA,              /* Fits in 16 bits */
+			0xB0B0B000,          /* Fits in 32 bits, should not get rounded down */
+			0xF0F0F0F0,          /* Fits in 32 bits */
+			((1ULL << 32) + 4),  /* Just above 32-bit limit */
+			0x6666777788889000,  /* Fits in 64 bits, should not get rounded down */
+			((1ULL << 60) - 100) /* Very large address, fitting in 64 bits */
+	};
+
+	for (i = 0; i < ARRAY_SIZE(test_inputs); i++) {
+		base = (void *)test_inputs[i];
+
+		imd_handle_init(&imd, (void *)base);
+
+		assert_int_equal(imd.lg.limit % LIMIT_ALIGN, 0);
+		assert_int_equal(imd.lg.limit, ALIGN_DOWN(test_inputs[i], LIMIT_ALIGN));
+		assert_ptr_equal(imd.lg.r, NULL);
+
+		/* Small allocations not initialized */
+		assert_ptr_equal(imd.sm.limit, NULL);
+		assert_ptr_equal(imd.sm.r, NULL);
+	}
+}
+
+static void test_imd_handle_init_partial_recovery(void **state)
+{
+	void *base;
+	struct imd imd = {0};
+	const struct imd_entry *entry;
+
+	imd_handle_init_partial_recovery(&imd);
+	assert_null(imd.lg.limit);
+	assert_null(imd.sm.limit);
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+	imd_handle_init_partial_recovery(&imd);
+
+	assert_non_null(imd.lg.r);
+	assert_null(imd.sm.limit);
+
+	assert_int_equal(0, imd_create_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN));
+	entry = imd_entry_add(&imd, SMALL_REGION_ID, LG_ENTRY_SIZE);
+	assert_non_null(entry);
+
+	imd_handle_init_partial_recovery(&imd);
+
+	assert_non_null(imd.lg.r);
+	assert_non_null(imd.sm.limit);
+	assert_ptr_equal(imd.lg.r + entry->start_offset + LG_ENTRY_SIZE, imd.sm.limit);
+	assert_non_null(imd.sm.r);
+
+	free(base);
+}
+
+static void test_imd_create_empty(void **state)
+{
+	struct imd imd = {0};
+	void *base;
+	struct imd_root *r;
+	struct imd_entry *e;
+
+	/* Expect imd_create_empty to fail, since imd handle is not initialized */
+	assert_int_equal(-1, imd_create_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN));
+	base = malloc(sizeof(struct imd_root_pointer) + sizeof(struct imd_root));
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	/* Try incorrect sizes */
+	assert_int_equal(-1, imd_create_empty(&imd,
+					sizeof(struct imd_root_pointer),
+					LG_ENTRY_ALIGN));
+	assert_int_equal(-1, imd_create_empty(&imd, LG_ROOT_SIZE, 2 * LG_ROOT_SIZE));
+
+	/* Working case */
+	assert_int_equal(0, imd_create_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN));
+
+	/* Only large allocation initialized with one entry for the root region */
+	r = (struct imd_root *) (imd.lg.r);
+	assert_non_null(r);
+
+	e = &r->entries[r->num_entries - 1];
+
+	assert_int_equal(max_entries(LG_ROOT_SIZE), r->max_entries);
+	assert_int_equal(1, r->num_entries);
+	assert_int_equal(0, r->flags);
+	assert_int_equal(LG_ENTRY_ALIGN, r->entry_align);
+	assert_int_equal(0, r->max_offset);
+	assert_ptr_equal(e, &r->entries);
+
+	assert_int_equal(IMD_ENTRY_MAGIC, e->magic);
+	assert_int_equal(0, e->start_offset);
+	assert_int_equal(LG_ROOT_SIZE, e->size);
+	assert_int_equal(CBMEM_ID_IMD_ROOT, e->id);
+
+	free(base);
+}
+
+static void test_imd_create_tiered_empty(void **state)
+{
+	void *base;
+	size_t sm_region_size, lg_region_wrong_size;
+	struct imd imd = {0};
+	struct imd_root *r;
+	struct imd_entry *fst_lg_entry, *snd_lg_entry, *sm_entry;
+
+	/* Uninitialized imd handle */
+	assert_int_equal(-1, imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN,
+						     LG_ROOT_SIZE, SM_ENTRY_ALIGN));
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	/* Too small root_size for small region */
+	assert_int_equal(-1, imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN,
+			 sizeof(int32_t), 2 * sizeof(int32_t)));
+
+	/* Fail when large region doesn't have capacity for more than 1 entry */
+	lg_region_wrong_size = sizeof(struct imd_root_pointer) + sizeof(struct imd_root) +
+			       sizeof(struct imd_entry);
+	assert_int_equal(-1, imd_create_tiered_empty(&imd, lg_region_wrong_size,
+						     LG_ENTRY_ALIGN, SM_ROOT_SIZE,
+						     SM_ENTRY_ALIGN));
+
+	assert_int_equal(0, imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN,
+						    SM_ROOT_SIZE, SM_ENTRY_ALIGN));
+
+	r = imd.lg.r;
+
+	/* One entry for root_region and one for small allocations */
+	assert_int_equal(2, r->num_entries);
+
+	fst_lg_entry = &r->entries[0];
+	assert_int_equal(IMD_ENTRY_MAGIC, fst_lg_entry->magic);
+	assert_int_equal(0, fst_lg_entry->start_offset);
+	assert_int_equal(LG_ROOT_SIZE, fst_lg_entry->size);
+	assert_int_equal(CBMEM_ID_IMD_ROOT, fst_lg_entry->id);
+
+	/* Calculated like in imd_create_tiered_empty */
+	sm_region_size = max_entries(SM_ROOT_SIZE) * SM_ENTRY_ALIGN;
+	sm_region_size += SM_ROOT_SIZE;
+	sm_region_size = ALIGN_UP(sm_region_size, LG_ENTRY_ALIGN);
+
+	snd_lg_entry = &r->entries[1];
+	assert_int_equal(IMD_ENTRY_MAGIC, snd_lg_entry->magic);
+	assert_int_equal(-sm_region_size, snd_lg_entry->start_offset);
+	assert_int_equal(CBMEM_ID_IMD_SMALL, snd_lg_entry->id);
+
+	assert_int_equal(sm_region_size, snd_lg_entry->size);
+
+	r = imd.sm.r;
+	assert_int_equal(1, r->num_entries);
+
+	sm_entry = &r->entries[0];
+	assert_int_equal(IMD_ENTRY_MAGIC, sm_entry->magic);
+	assert_int_equal(0, sm_entry->start_offset);
+	assert_int_equal(SM_ROOT_SIZE, sm_entry->size);
+	assert_int_equal(CBMEM_ID_IMD_ROOT, sm_entry->id);
+
+	free(base);
+}
+
+/* Tests for imdr_recover. */
+static void test_imd_recover(void **state)
+{
+	int32_t offset_copy, max_offset_copy;
+	uint32_t rp_magic_copy, num_entries_copy;
+	uint32_t e_align_copy, e_magic_copy, e_id_copy;
+	uint32_t size_copy, diff;
+	void *base;
+	struct imd imd = {0};
+	struct imd_root_pointer *rp;
+	struct imd_root *r;
+	struct imd_entry *lg_root_entry, *sm_root_entry,  *ptr;
+	const struct imd_entry *lg_entry;
+
+	/* Fail when the limit for lg was not set. */
+	imd.lg.limit = (uintptr_t) NULL;
+	assert_int_equal(-1, imd_recover(&imd));
+
+	/* Set the limit for lg. */
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	/* Fail when the root pointer is not valid. */
+	rp = (void *)imd.lg.limit - sizeof(struct imd_root_pointer);
+	assert_non_null(rp);
+	assert_int_equal(IMD_ROOT_PTR_MAGIC, rp->magic);
+
+	rp_magic_copy = rp->magic;
+	rp->magic = 0;
+	assert_int_equal(-1, imd_recover(&imd));
+	rp->magic = rp_magic_copy;
+
+	/* Set the root pointer. */
+	assert_int_equal(0, imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN,
+						    SM_ROOT_SIZE, SM_ENTRY_ALIGN));
+	assert_int_equal(2, ((struct imd_root *)imd.lg.r)->num_entries);
+	assert_int_equal(1, ((struct imd_root *)imd.sm.r)->num_entries);
+
+	/* Fail if the number of entries exceeds the maximum number of entries. */
+	r = imd.lg.r;
+	num_entries_copy = r->num_entries;
+	r->num_entries = r->max_entries + 1;
+	assert_int_equal(-1, imd_recover(&imd));
+	r->num_entries = num_entries_copy;
+
+	/* Fail if entry align is not a power of 2.  */
+	e_align_copy = r->entry_align;
+	r->entry_align++;
+	assert_int_equal(-1, imd_recover(&imd));
+	r->entry_align = e_align_copy;
+
+	/* Fail when an entry is not valid. */
+	lg_root_entry = &r->entries[0];
+	e_magic_copy = lg_root_entry->magic;
+	lg_root_entry->magic = 0;
+	assert_int_equal(-1, imd_recover(&imd));
+	lg_root_entry->magic = e_magic_copy;
+
+	/* Add new entries: large and small. */
+	lg_entry = imd_entry_add(&imd, LG_ENTRY_ID, LG_ENTRY_SIZE);
+	assert_non_null(lg_entry);
+	assert_int_equal(3, r->num_entries);
+
+	assert_non_null(imd_entry_add(&imd, SM_ENTRY_ID, SM_ENTRY_SIZE));
+	assert_int_equal(2, ((struct imd_root *)imd.sm.r)->num_entries);
+
+	/* Fail when start_addr is lower than low_limit. */
+	r = imd.lg.r;
+	max_offset_copy = r->max_offset;
+	r->max_offset = lg_entry->start_offset + sizeof(int32_t);
+	assert_int_equal(-1, imd_recover(&imd));
+	r->max_offset = max_offset_copy;
+
+	/* Fail when start_addr is at least imdr->limit. */
+	offset_copy = lg_entry->start_offset;
+	ptr = (struct imd_entry *)lg_entry;
+	ptr->start_offset = (void *)imd.lg.limit - (void *)r;
+	assert_int_equal(-1, imd_recover(&imd));
+	ptr->start_offset = offset_copy;
+
+	/* Fail when (start_addr + e->size) is higher than imdr->limit. */
+	size_copy = lg_entry->size;
+	diff = (void *)imd.lg.limit - ((void *)r + lg_entry->start_offset);
+	ptr->size = diff + 1;
+	assert_int_equal(-1, imd_recover(&imd));
+	ptr->size = size_copy;
+
+	/* Succeed if small region is not present. */
+	sm_root_entry = &r->entries[1];
+	e_id_copy = sm_root_entry->id;
+	sm_root_entry->id = 0;
+	assert_int_equal(0, imd_recover(&imd));
+	sm_root_entry->id = e_id_copy;
+
+	assert_int_equal(0, imd_recover(&imd));
+
+	free(base);
+}
+
+static void test_imd_limit_size(void **state)
+{
+	void *base;
+	struct imd imd = {0};
+	size_t root_size, max_size;
+
+	max_size = align_up_pow2(sizeof(struct imd_root_pointer)
+			+ sizeof(struct imd_root) + 3 * sizeof(struct imd_entry));
+
+	assert_int_equal(-1, imd_limit_size(&imd, max_size));
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	root_size = align_up_pow2(sizeof(struct imd_root_pointer)
+			+ sizeof(struct imd_root) + 2 * sizeof(struct imd_entry));
+	imd.lg.r = (void *)imd.lg.limit - root_size;
+
+	imd_create_empty(&imd, root_size, LG_ENTRY_ALIGN);
+	assert_int_equal(-1, imd_limit_size(&imd, root_size - 1));
+	assert_int_equal(0, imd_limit_size(&imd, max_size));
+
+	/* Cannot create such a big entry */
+	assert_null(imd_entry_add(&imd, LG_ENTRY_ID, max_size - root_size + 1));
+
+	free(base);
+}
+
+static void test_imd_lockdown(void **state)
+{
+	struct imd imd = {0};
+	struct imd_root *r_lg, *r_sm;
+
+	assert_int_equal(-1, imd_lockdown(&imd));
+
+	imd.lg.r = malloc(sizeof(struct imd_root));
+	if (imd.lg.r == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+
+	r_lg = (struct imd_root *) (imd.lg.r);
+
+	assert_int_equal(0, imd_lockdown(&imd));
+	assert_true(r_lg->flags & IMD_FLAG_LOCKED);
+
+	imd.sm.r = malloc(sizeof(struct imd_root));
+	if (imd.sm.r == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+	r_sm = (struct imd_root *) (imd.sm.r);
+
+	assert_int_equal(0, imd_lockdown(&imd));
+	assert_true(r_sm->flags & IMD_FLAG_LOCKED);
+
+	free(imd.lg.r);
+	free(imd.sm.r);
+}
+
+static void test_imd_region_used(void **state)
+{
+	struct imd imd = {0};
+	struct imd_entry *first_entry, *new_entry;
+	struct imd_root *r;
+	size_t size;
+	void *imd_base;
+	void *base;
+
+	assert_int_equal(-1, imd_region_used(&imd, &base, &size));
+
+	imd_base = malloc(LIMIT_ALIGN);
+	if (imd_base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)imd_base));
+
+	assert_int_equal(-1, imd_region_used(&imd, &base, &size));
+	assert_int_equal(0, imd_create_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN));
+	assert_int_equal(0, imd_region_used(&imd, &base, &size));
+
+	r = (struct imd_root *)imd.lg.r;
+	first_entry = &r->entries[r->num_entries - 1];
+
+	assert_int_equal(r + first_entry->start_offset, (uintptr_t)base);
+	assert_int_equal(first_entry->size, size);
+
+	assert_non_null(imd_entry_add(&imd, LG_ENTRY_ID, LG_ENTRY_SIZE));
+	assert_int_equal(2, r->num_entries);
+
+	assert_int_equal(0, imd_region_used(&imd, &base, &size));
+
+	new_entry = &r->entries[r->num_entries - 1];
+
+	assert_true((void *)r + new_entry->start_offset == base);
+	assert_int_equal(first_entry->size + new_entry->size, size);
+
+	free(imd_base);
+}
+
+static void test_imd_entry_add(void **state)
+{
+	int i;
+	struct imd imd = {0};
+	size_t entry_size = 0;
+	size_t used_size;
+	ssize_t entry_offset;
+	void *base;
+	struct imd_root *r, *sm_r, *lg_r;
+	struct imd_entry *first_entry, *new_entry;
+	uint32_t num_entries_copy;
+	int32_t max_offset_copy;
+
+	/* No small region case. */
+	assert_null(imd_entry_add(&imd, LG_ENTRY_ID, entry_size));
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	assert_int_equal(0, imd_create_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN));
+
+	r = (struct imd_root *)imd.lg.r;
+	first_entry = &r->entries[r->num_entries - 1];
+
+	/* Cannot add an entry when root is locked. */
+	r->flags = IMD_FLAG_LOCKED;
+	assert_null(imd_entry_add(&imd, LG_ENTRY_ID, entry_size));
+	r->flags = 0;
+
+	/* Fail when the maximum number of entries has been reached. */
+	num_entries_copy = r->num_entries;
+	r->num_entries = r->max_entries;
+	assert_null(imd_entry_add(&imd, LG_ENTRY_ID, entry_size));
+	r->num_entries = num_entries_copy;
+
+	/* Fail when entry size is 0 */
+	assert_null(imd_entry_add(&imd, LG_ENTRY_ID, 0));
+
+	/* Fail when entry size (after alignment) overflows imd total size. */
+	entry_size = 2049;
+	max_offset_copy = r->max_offset;
+	r->max_offset = -entry_size;
+	assert_null(imd_entry_add(&imd, LG_ENTRY_ID, entry_size));
+	r->max_offset = max_offset_copy;
+
+	/* Finally succeed. */
+	entry_size = 2 * sizeof(int32_t);
+	assert_non_null(imd_entry_add(&imd, LG_ENTRY_ID, entry_size));
+	assert_int_equal(2, r->num_entries);
+
+	new_entry = &r->entries[r->num_entries - 1];
+	assert_int_equal(sizeof(struct imd_entry), (void *)new_entry - (void *)first_entry);
+
+	assert_int_equal(IMD_ENTRY_MAGIC, new_entry->magic);
+	assert_int_equal(LG_ENTRY_ID, new_entry->id);
+	assert_int_equal(entry_size, new_entry->size);
+
+	used_size = ALIGN_UP(entry_size, r->entry_align);
+	entry_offset = first_entry->start_offset - used_size;
+	assert_int_equal(entry_offset, new_entry->start_offset);
+
+	/* Use small region case. */
+	imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN, SM_ROOT_SIZE,
+				SM_ENTRY_ALIGN);
+
+	lg_r = imd.lg.r;
+	sm_r = imd.sm.r;
+
+	/* All five new entries should be added to small allocations */
+	for (i = 0; i < 5; i++) {
+		assert_non_null(imd_entry_add(&imd, SM_ENTRY_ID, SM_ENTRY_SIZE));
+		assert_int_equal(i+2, sm_r->num_entries);
+		assert_int_equal(2, lg_r->num_entries);
+	}
+
+	/* But next should fall back on large region */
+	assert_non_null(imd_entry_add(&imd, SM_ENTRY_ID, SM_ENTRY_SIZE));
+	assert_int_equal(6, sm_r->num_entries);
+	assert_int_equal(3, lg_r->num_entries);
+
+	/*
+	 * Small allocation is created when occupies less than 1/4 of available
+	 * small region. Verify this.
+	 */
+	imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN, SM_ROOT_SIZE,
+				SM_ENTRY_ALIGN);
+
+	assert_non_null(imd_entry_add(&imd, SM_ENTRY_ID, -sm_r->max_offset / 4 + 1));
+	assert_int_equal(1, sm_r->num_entries);
+	assert_int_equal(3, lg_r->num_entries);
+
+	/* Next two should go into small region */
+	assert_non_null(imd_entry_add(&imd, SM_ENTRY_ID, -sm_r->max_offset / 4));
+	assert_int_equal(2, sm_r->num_entries);
+	assert_int_equal(3, lg_r->num_entries);
+
+	/* (1/4 * 3/4) */
+	assert_non_null(imd_entry_add(&imd, SM_ENTRY_ID, -sm_r->max_offset / 16 * 3));
+	assert_int_equal(3, sm_r->num_entries);
+	assert_int_equal(3, lg_r->num_entries);
+
+	free(base);
+}
+
+static void test_imd_entry_find(void **state)
+{
+	struct imd imd = {0};
+	void *base;
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	assert_int_equal(0, imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN,
+						    SM_ROOT_SIZE, SM_ENTRY_ALIGN));
+
+	assert_non_null(imd_entry_add(&imd, LG_ENTRY_ID, LG_ENTRY_SIZE));
+
+	assert_non_null(imd_entry_find(&imd, LG_ENTRY_ID));
+	assert_non_null(imd_entry_find(&imd, SMALL_REGION_ID));
+
+	/* Try invalid id, should fail */
+	assert_null(imd_entry_find(&imd, INVALID_REGION_ID));
+
+	free(base);
+}
+
+static void test_imd_entry_find_or_add(void **state)
+{
+	struct imd imd = {0};
+	const struct imd_entry *entry;
+	struct imd_root *r;
+	void *base;
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	assert_null(imd_entry_find_or_add(&imd, LG_ENTRY_ID, LG_ENTRY_SIZE));
+
+	assert_int_equal(0, imd_create_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN));
+	entry = imd_entry_find_or_add(&imd, LG_ENTRY_ID, LG_ENTRY_SIZE);
+	assert_non_null(entry);
+
+	r = (struct imd_root *)imd.lg.r;
+
+	assert_int_equal(entry->id, LG_ENTRY_ID);
+	assert_int_equal(2, r->num_entries);
+	assert_non_null(imd_entry_find_or_add(&imd, LG_ENTRY_ID, LG_ENTRY_SIZE));
+	assert_int_equal(2, r->num_entries);
+
+	free(base);
+}
+
+static void test_imd_entry_size(void **state)
+{
+	struct imd_entry entry = { .size =  LG_ENTRY_SIZE };
+
+	assert_int_equal(LG_ENTRY_SIZE, imd_entry_size(&entry));
+
+	entry.size = 0;
+	assert_int_equal(0, imd_entry_size(&entry));
+}
+
+static void test_imd_entry_at(void **state)
+{
+	struct imd imd = {0};
+	struct imd_root *r;
+	struct imd_entry *e = NULL;
+	const struct imd_entry *entry;
+	void *base;
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	assert_int_equal(0, imd_create_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN));
+
+	/* Fail when entry is NULL */
+	assert_null(imd_entry_at(&imd, e));
+
+	entry = imd_entry_add(&imd, LG_ENTRY_ID, LG_ENTRY_SIZE);
+	assert_non_null(entry);
+
+	r = (struct imd_root *)imd.lg.r;
+	assert_ptr_equal((void *)r + entry->start_offset, imd_entry_at(&imd, entry));
+
+	free(base);
+}
+
+static void test_imd_entry_id(void **state)
+{
+	struct imd_entry entry = { .id =  LG_ENTRY_ID };
+
+	assert_int_equal(LG_ENTRY_ID, imd_entry_id(&entry));
+}
+
+static void test_imd_entry_remove(void **state)
+{
+	void *base;
+	struct imd imd = {0};
+	struct imd_root *r;
+	const struct imd_entry *fst_lg_entry, *snd_lg_entry, *fst_sm_entry;
+	const struct imd_entry *e = NULL;
+
+	/* Uninitialized handle */
+	assert_int_equal(-1, imd_entry_remove(&imd, e));
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	assert_int_equal(0, imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN,
+						    SM_ROOT_SIZE, SM_ENTRY_ALIGN));
+
+	r = imd.lg.r;
+	assert_int_equal(2, r->num_entries);
+	fst_lg_entry = &r->entries[0];
+	snd_lg_entry = &r->entries[1];
+
+	/* Only last entry can be removed */
+	assert_int_equal(-1, imd_entry_remove(&imd, fst_lg_entry));
+	r->flags = IMD_FLAG_LOCKED;
+	assert_int_equal(-1, imd_entry_remove(&imd, snd_lg_entry));
+	r->flags = 0;
+
+	r = imd.sm.r;
+	assert_int_equal(1, r->num_entries);
+	fst_sm_entry = &r->entries[0];
+
+	/* Fail trying to remove root entry */
+	assert_int_equal(-1, imd_entry_remove(&imd, fst_sm_entry));
+	assert_int_equal(1, r->num_entries);
+
+	r = imd.lg.r;
+	assert_int_equal(0, imd_entry_remove(&imd, snd_lg_entry));
+	assert_int_equal(1, r->num_entries);
+
+	/* Fail trying to remove root entry */
+	assert_int_equal(-1, imd_entry_remove(&imd, fst_lg_entry));
+	assert_int_equal(1, r->num_entries);
+
+	free(base);
+}
+
+static void test_imd_cursor_init(void **state)
+{
+	struct imd imd = {0};
+	struct imd_cursor cursor;
+
+	assert_int_equal(-1, imd_cursor_init(NULL, NULL));
+	assert_int_equal(-1, imd_cursor_init(NULL, &cursor));
+	assert_int_equal(-1, imd_cursor_init(&imd, NULL));
+	assert_int_equal(0, imd_cursor_init(&imd, &cursor));
+
+	assert_ptr_equal(cursor.imdr[0], &imd.lg);
+	assert_ptr_equal(cursor.imdr[1], &imd.sm);
+}
+
+static void test_imd_cursor_next(void **state)
+{
+	void *base;
+	struct imd imd = {0};
+	struct imd_cursor cursor;
+	struct imd_root *r;
+	const struct imd_entry *entry;
+	struct imd_entry *fst_lg_entry, *snd_lg_entry, *fst_sm_entry;
+	assert_int_equal(0, imd_cursor_init(&imd, &cursor));
+
+	cursor.current_imdr = 3;
+	cursor.current_entry = 0;
+	assert_null(imd_cursor_next(&cursor));
+
+	cursor.current_imdr = 0;
+	assert_null(imd_cursor_next(&cursor));
+
+	base = malloc(LIMIT_ALIGN);
+	if (base == NULL)
+		fail_msg("Cannot allocate enough memory - fail test");
+	imd_handle_init(&imd, (void *)(LIMIT_ALIGN + (uintptr_t)base));
+
+	assert_int_equal(0, imd_create_tiered_empty(&imd, LG_ROOT_SIZE, LG_ENTRY_ALIGN,
+						    SM_ROOT_SIZE, SM_ENTRY_ALIGN));
+
+	r = imd.lg.r;
+	entry = imd_cursor_next(&cursor);
+	assert_non_null(entry);
+
+	fst_lg_entry = &r->entries[0];
+	assert_int_equal(fst_lg_entry->id, entry->id);
+	assert_ptr_equal(fst_lg_entry, entry);
+
+	entry = imd_cursor_next(&cursor);
+	assert_non_null(entry);
+
+	snd_lg_entry = &r->entries[1];
+	assert_int_equal(snd_lg_entry->id, entry->id);
+	assert_ptr_equal(snd_lg_entry, entry);
+
+	entry = imd_cursor_next(&cursor);
+	assert_non_null(entry);
+
+	r = imd.sm.r;
+	fst_sm_entry = &r->entries[0];
+	assert_int_equal(fst_sm_entry->id, entry->id);
+	assert_ptr_equal(fst_sm_entry, entry);
+
+	entry = imd_cursor_next(&cursor);
+	assert_null(entry);
+}
+
+int main(void)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(test_imd_handle_init),
+		cmocka_unit_test(test_imd_handle_init_partial_recovery),
+		cmocka_unit_test(test_imd_create_empty),
+		cmocka_unit_test(test_imd_create_tiered_empty),
+		cmocka_unit_test(test_imd_recover),
+		cmocka_unit_test(test_imd_limit_size),
+		cmocka_unit_test(test_imd_lockdown),
+		cmocka_unit_test(test_imd_region_used),
+		cmocka_unit_test(test_imd_entry_add),
+		cmocka_unit_test(test_imd_entry_find),
+		cmocka_unit_test(test_imd_entry_find_or_add),
+		cmocka_unit_test(test_imd_entry_size),
+		cmocka_unit_test(test_imd_entry_at),
+		cmocka_unit_test(test_imd_entry_id),
+		cmocka_unit_test(test_imd_entry_remove),
+		cmocka_unit_test(test_imd_cursor_init),
+		cmocka_unit_test(test_imd_cursor_next),
+	};
+
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}
+