[PATCH v1 3/3] drm/xe/ggtt: Add KUnit tests for usable and shareable pools

From: Piotr Piórkowski <[email protected]>

Add GGTT KUnit tests focused on the newly introduced usable and
shareable pools.

Cover range initialization for native and PF modes, including partially
overlapping pools. Exercise allocation direction and conflicts between
the pools, as well as the unavailable shareable pool and requests
exceeding pool capacity.

Signed-off-by: Piotr Piórkowski <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
---
 drivers/gpu/drm/xe/tests/xe_ggtt_test.c | 315 ++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_ggtt.c            |   4 +
 2 files changed, 319 insertions(+)
 create mode 100644 drivers/gpu/drm/xe/tests/xe_ggtt_test.c

diff --git a/drivers/gpu/drm/xe/tests/xe_ggtt_test.c b/drivers/gpu/drm/xe/tests/xe_ggtt_test.c
new file mode 100644
index 000000000000..c9b9dab058fb
--- /dev/null
+++ b/drivers/gpu/drm/xe/tests/xe_ggtt_test.c
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: GPL-2.0 AND MIT
+/*
+ * Copyright © 2026 Intel Corporation
+ */
+
+#include <kunit/test.h>
+
+#include "xe_device.h"
+#include "xe_kunit_helpers.h"
+
+#define GGTT_TEST_START		SZ_1M
+
+static int ggtt_test_init(struct kunit *test)
+{
+	xe_kunit_helper_xe_device_test_init(test);
+	return 0;
+}
+
+static void init_native(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = min_t(u64, SZ_1G, accessible);
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, 0);
+
+	KUNIT_EXPECT_EQ(test, ggtt.start, GGTT_TEST_START);
+	KUNIT_EXPECT_EQ(test, ggtt.size_usable, usable);
+	KUNIT_EXPECT_EQ(test, ggtt_total_size(&ggtt), usable);
+
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_usable_pool_high(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *usable_node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, 0);
+
+	usable_node = xe_ggtt_insert_node(&ggtt, XE_PAGE_SIZE, XE_PAGE_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, usable_node);
+	KUNIT_EXPECT_EQ(test, xe_ggtt_node_addr(usable_node),
+			GGTT_TEST_START + usable - XE_PAGE_SIZE);
+
+	ggtt_node_remove(usable_node);
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_usable_pool_oversized(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+
+	KUNIT_ASSERT_LE(test, usable + XE_PAGE_SIZE, (u64)U32_MAX);
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, 0);
+
+	node = xe_ggtt_insert_node(&ggtt, usable + XE_PAGE_SIZE, XE_PAGE_SIZE);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(node));
+	KUNIT_EXPECT_EQ(test, PTR_ERR(node), -ENOSPC);
+
+	drm_mm_takedown(&ggtt.mm);
+}
+
+#if IS_ENABLED(CONFIG_PCI_IOV)
+static void init_shared_pf(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	u64 accessible = ggtt_accessible_size(&ggtt);
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, accessible, accessible);
+
+	KUNIT_EXPECT_EQ(test, ggtt.size_usable, accessible);
+	KUNIT_EXPECT_EQ(test, ggtt.shareable.start, 0);
+	KUNIT_EXPECT_EQ(test, ggtt.shareable.size, accessible);
+	KUNIT_EXPECT_EQ(test, ggtt_total_size(&ggtt), accessible);
+
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void init_partial_overlap(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+	u64 shareable = accessible / 2;
+
+	KUNIT_ASSERT_GT(test, accessible, 0ULL);
+	KUNIT_ASSERT_GT(test, usable, shareable);
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, shareable);
+
+	KUNIT_EXPECT_EQ(test, ggtt.size_usable, usable);
+	KUNIT_EXPECT_EQ(test, ggtt.shareable.start, accessible - shareable);
+	KUNIT_EXPECT_EQ(test, ggtt.shareable.size, shareable);
+	KUNIT_EXPECT_LT(test, ggtt.shareable.start, usable);
+	KUNIT_EXPECT_EQ(test, ggtt_total_size(&ggtt), accessible);
+
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_usable_pool_low(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *usable_node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+	u64 shareable = accessible / 2;
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, shareable);
+
+	usable_node = xe_ggtt_insert_node(&ggtt, XE_PAGE_SIZE, XE_PAGE_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, usable_node);
+	KUNIT_EXPECT_EQ(test, xe_ggtt_node_addr(usable_node), GGTT_TEST_START);
+	KUNIT_EXPECT_EQ(test, xe_ggtt_node_size(usable_node), (u64)XE_PAGE_SIZE);
+
+	ggtt_node_remove(usable_node);
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_shareable_pool_high(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *shareable_node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+	u64 shareable = accessible / 2;
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, shareable);
+
+	shareable_node = xe_ggtt_insert_node_shareable(&ggtt,
+						       XE_PAGE_SIZE,
+						       XE_PAGE_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shareable_node);
+	KUNIT_EXPECT_EQ(test, xe_ggtt_node_addr(shareable_node),
+			GGTT_TEST_START + accessible - XE_PAGE_SIZE);
+	KUNIT_EXPECT_EQ(test, xe_ggtt_node_size(shareable_node),
+			(u64)XE_PAGE_SIZE);
+
+	ggtt_node_remove(shareable_node);
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_partial_overlap(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *usable_node, *shareable_node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+	u64 shareable = accessible / 2;
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, shareable);
+
+	usable_node = xe_ggtt_insert_node(&ggtt, XE_PAGE_SIZE, XE_PAGE_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, usable_node);
+	shareable_node = xe_ggtt_insert_node_shareable(&ggtt,
+						       XE_PAGE_SIZE,
+						       XE_PAGE_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shareable_node);
+
+	KUNIT_EXPECT_EQ(test, xe_ggtt_node_addr(usable_node), GGTT_TEST_START);
+	KUNIT_EXPECT_EQ(test, xe_ggtt_node_addr(shareable_node),
+			GGTT_TEST_START + accessible - XE_PAGE_SIZE);
+
+	ggtt_node_remove(shareable_node);
+	ggtt_node_remove(usable_node);
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_partial_overlap_usable_full(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *usable_node, *shareable_node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+	u64 shareable = accessible / 2;
+
+	KUNIT_ASSERT_LE(test, usable, (u64)U32_MAX);
+	KUNIT_ASSERT_LE(test, shareable, (u64)U32_MAX);
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, shareable);
+
+	usable_node = xe_ggtt_insert_node(&ggtt, usable, XE_PAGE_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, usable_node);
+	shareable_node = xe_ggtt_insert_node_shareable(&ggtt,
+						       shareable,
+						       XE_PAGE_SIZE);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(shareable_node));
+	KUNIT_EXPECT_EQ(test, PTR_ERR(shareable_node), -ENOSPC);
+
+	ggtt_node_remove(usable_node);
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_partial_overlap_shareable_full(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *usable_node, *shareable_node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+	u64 shareable = accessible / 2;
+
+	KUNIT_ASSERT_LE(test, usable, (u64)U32_MAX);
+	KUNIT_ASSERT_LE(test, shareable, (u64)U32_MAX);
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, shareable);
+
+	shareable_node = xe_ggtt_insert_node_shareable(&ggtt,
+						       shareable,
+						       XE_PAGE_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shareable_node);
+	usable_node = xe_ggtt_insert_node(&ggtt, usable, XE_PAGE_SIZE);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(usable_node));
+	KUNIT_EXPECT_EQ(test, PTR_ERR(usable_node), -ENOSPC);
+
+	ggtt_node_remove(shareable_node);
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_shareable_pool_unavailable(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, 0);
+
+	node = xe_ggtt_insert_node_shareable(&ggtt, XE_PAGE_SIZE, XE_PAGE_SIZE);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(node));
+	KUNIT_EXPECT_EQ(test, PTR_ERR(node), -ENOSPC);
+
+	drm_mm_takedown(&ggtt.mm);
+}
+
+static void alloc_shareable_pool_oversized(struct kunit *test)
+{
+	struct xe_tile *tile = xe_device_get_root_tile(test->priv);
+	struct xe_ggtt ggtt = { .tile = tile };
+	struct xe_ggtt_node *node;
+	u64 accessible = ggtt_accessible_size(&ggtt);
+	u64 usable = (accessible * 3) / 4;
+	u64 shareable = accessible / 2;
+
+	KUNIT_ASSERT_LE(test, shareable + XE_PAGE_SIZE, (u64)U32_MAX);
+
+	ggtt_init_ranges(&ggtt, GGTT_TEST_START, usable, shareable);
+
+	node = xe_ggtt_insert_node_shareable(&ggtt,
+					     shareable + XE_PAGE_SIZE,
+					     XE_PAGE_SIZE);
+	KUNIT_ASSERT_TRUE(test, IS_ERR(node));
+	KUNIT_EXPECT_EQ(test, PTR_ERR(node), -ENOSPC);
+
+	drm_mm_takedown(&ggtt.mm);
+}
+#else
+#define GGTT_PCI_IOV_TEST_SKIP(_name) \
+	static void _name(struct kunit *test) \
+	{ \
+		kunit_skip(test, "requires CONFIG_PCI_IOV"); \
+	}
+
+GGTT_PCI_IOV_TEST_SKIP(init_shared_pf)
+GGTT_PCI_IOV_TEST_SKIP(init_partial_overlap)
+GGTT_PCI_IOV_TEST_SKIP(alloc_usable_pool_low)
+GGTT_PCI_IOV_TEST_SKIP(alloc_shareable_pool_high)
+GGTT_PCI_IOV_TEST_SKIP(alloc_partial_overlap)
+GGTT_PCI_IOV_TEST_SKIP(alloc_partial_overlap_usable_full)
+GGTT_PCI_IOV_TEST_SKIP(alloc_partial_overlap_shareable_full)
+GGTT_PCI_IOV_TEST_SKIP(alloc_shareable_pool_unavailable)
+GGTT_PCI_IOV_TEST_SKIP(alloc_shareable_pool_oversized)
+
+#undef GGTT_PCI_IOV_TEST_SKIP
+#endif /* CONFIG_PCI_IOV */
+
+static struct kunit_case ggtt_test_cases[] = {
+	KUNIT_CASE(init_native),
+	KUNIT_CASE(alloc_usable_pool_high),
+	KUNIT_CASE(alloc_usable_pool_oversized),
+	KUNIT_CASE(init_shared_pf),
+	KUNIT_CASE(init_partial_overlap),
+	KUNIT_CASE(alloc_usable_pool_low),
+	KUNIT_CASE(alloc_shareable_pool_high),
+	KUNIT_CASE(alloc_partial_overlap),
+	KUNIT_CASE(alloc_partial_overlap_usable_full),
+	KUNIT_CASE(alloc_partial_overlap_shareable_full),
+	KUNIT_CASE(alloc_shareable_pool_unavailable),
+	KUNIT_CASE(alloc_shareable_pool_oversized),
+	{}
+};
+
+static struct kunit_suite ggtt_suite = {
+	.name = "xe_ggtt",
+	.test_cases = ggtt_test_cases,
+	.init = ggtt_test_init,
+};
+
+kunit_test_suites(&ggtt_suite);
diff --git a/drivers/gpu/drm/xe/xe_ggtt.c b/drivers/gpu/drm/xe/xe_ggtt.c
index 18e7d8f55673..8b5dc482f0d3 100644
--- a/drivers/gpu/drm/xe/xe_ggtt.c
+++ b/drivers/gpu/drm/xe/xe_ggtt.c
@@ -1366,3 +1366,7 @@ u64 xe_ggtt_node_size(const struct xe_ggtt_node *node)
 {
 	return node->base.size;
 }
+
+#if IS_BUILTIN(CONFIG_DRM_XE_KUNIT_TEST)
+#include "tests/xe_ggtt_test.c"
+#endif
-- 
2.34.1