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-rw-r--r--kernel/resource_kunit.c306
1 files changed, 306 insertions, 0 deletions
diff --git a/kernel/resource_kunit.c b/kernel/resource_kunit.c
new file mode 100644
index 000000000000..b8ef75b99eb2
--- /dev/null
+++ b/kernel/resource_kunit.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Test cases for API provided by resource.c and ioport.h
+ */
+
+#include <kunit/test.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/sizes.h>
+#include <linux/mm.h>
+
+#define R0_START 0x0000
+#define R0_END 0xffff
+#define R1_START 0x1234
+#define R1_END 0x2345
+#define R2_START 0x4567
+#define R2_END 0x5678
+#define R3_START 0x6789
+#define R3_END 0x789a
+#define R4_START 0x2000
+#define R4_END 0x7000
+
+static struct resource r0 = { .start = R0_START, .end = R0_END };
+static struct resource r1 = { .start = R1_START, .end = R1_END };
+static struct resource r2 = { .start = R2_START, .end = R2_END };
+static struct resource r3 = { .start = R3_START, .end = R3_END };
+static struct resource r4 = { .start = R4_START, .end = R4_END };
+
+struct result {
+ struct resource *r1;
+ struct resource *r2;
+ struct resource r;
+ bool ret;
+};
+
+static struct result results_for_union[] = {
+ {
+ .r1 = &r1, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
+ }, {
+ .r1 = &r2, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
+ }, {
+ .r1 = &r3, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
+ }, {
+ .r1 = &r4, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
+ }, {
+ .r1 = &r2, .r2 = &r1, .ret = false,
+ }, {
+ .r1 = &r3, .r2 = &r1, .ret = false,
+ }, {
+ .r1 = &r4, .r2 = &r1, .r.start = R1_START, .r.end = R4_END, .ret = true,
+ }, {
+ .r1 = &r2, .r2 = &r3, .ret = false,
+ }, {
+ .r1 = &r2, .r2 = &r4, .r.start = R4_START, .r.end = R4_END, .ret = true,
+ }, {
+ .r1 = &r3, .r2 = &r4, .r.start = R4_START, .r.end = R3_END, .ret = true,
+ },
+};
+
+static struct result results_for_intersection[] = {
+ {
+ .r1 = &r1, .r2 = &r0, .r.start = R1_START, .r.end = R1_END, .ret = true,
+ }, {
+ .r1 = &r2, .r2 = &r0, .r.start = R2_START, .r.end = R2_END, .ret = true,
+ }, {
+ .r1 = &r3, .r2 = &r0, .r.start = R3_START, .r.end = R3_END, .ret = true,
+ }, {
+ .r1 = &r4, .r2 = &r0, .r.start = R4_START, .r.end = R4_END, .ret = true,
+ }, {
+ .r1 = &r2, .r2 = &r1, .ret = false,
+ }, {
+ .r1 = &r3, .r2 = &r1, .ret = false,
+ }, {
+ .r1 = &r4, .r2 = &r1, .r.start = R4_START, .r.end = R1_END, .ret = true,
+ }, {
+ .r1 = &r2, .r2 = &r3, .ret = false,
+ }, {
+ .r1 = &r2, .r2 = &r4, .r.start = R2_START, .r.end = R2_END, .ret = true,
+ }, {
+ .r1 = &r3, .r2 = &r4, .r.start = R3_START, .r.end = R4_END, .ret = true,
+ },
+};
+
+static void resource_do_test(struct kunit *test, bool ret, struct resource *r,
+ bool exp_ret, struct resource *exp_r,
+ struct resource *r1, struct resource *r2)
+{
+ KUNIT_EXPECT_EQ_MSG(test, ret, exp_ret, "Resources %pR %pR", r1, r2);
+ KUNIT_EXPECT_EQ_MSG(test, r->start, exp_r->start, "Start elements are not equal");
+ KUNIT_EXPECT_EQ_MSG(test, r->end, exp_r->end, "End elements are not equal");
+}
+
+static void resource_do_union_test(struct kunit *test, struct result *r)
+{
+ struct resource result;
+ bool ret;
+
+ memset(&result, 0, sizeof(result));
+ ret = resource_union(r->r1, r->r2, &result);
+ resource_do_test(test, ret, &result, r->ret, &r->r, r->r1, r->r2);
+
+ memset(&result, 0, sizeof(result));
+ ret = resource_union(r->r2, r->r1, &result);
+ resource_do_test(test, ret, &result, r->ret, &r->r, r->r2, r->r1);
+}
+
+static void resource_test_union(struct kunit *test)
+{
+ struct result *r = results_for_union;
+ unsigned int i = 0;
+
+ do {
+ resource_do_union_test(test, &r[i]);
+ } while (++i < ARRAY_SIZE(results_for_union));
+}
+
+static void resource_do_intersection_test(struct kunit *test, struct result *r)
+{
+ struct resource result;
+ bool ret;
+
+ memset(&result, 0, sizeof(result));
+ ret = resource_intersection(r->r1, r->r2, &result);
+ resource_do_test(test, ret, &result, r->ret, &r->r, r->r1, r->r2);
+
+ memset(&result, 0, sizeof(result));
+ ret = resource_intersection(r->r2, r->r1, &result);
+ resource_do_test(test, ret, &result, r->ret, &r->r, r->r2, r->r1);
+}
+
+static void resource_test_intersection(struct kunit *test)
+{
+ struct result *r = results_for_intersection;
+ unsigned int i = 0;
+
+ do {
+ resource_do_intersection_test(test, &r[i]);
+ } while (++i < ARRAY_SIZE(results_for_intersection));
+}
+
+/*
+ * The test resource tree for region_intersects() test:
+ *
+ * BASE-BASE+1M-1 : Test System RAM 0
+ * # hole 0 (BASE+1M-BASE+2M)
+ * BASE+2M-BASE+3M-1 : Test CXL Window 0
+ * BASE+3M-BASE+4M-1 : Test System RAM 1
+ * BASE+4M-BASE+7M-1 : Test CXL Window 1
+ * BASE+4M-BASE+5M-1 : Test System RAM 2
+ * BASE+4M+128K-BASE+4M+256K-1: Test Code
+ * BASE+5M-BASE+6M-1 : Test System RAM 3
+ */
+#define RES_TEST_RAM0_OFFSET 0
+#define RES_TEST_RAM0_SIZE SZ_1M
+#define RES_TEST_HOLE0_OFFSET (RES_TEST_RAM0_OFFSET + RES_TEST_RAM0_SIZE)
+#define RES_TEST_HOLE0_SIZE SZ_1M
+#define RES_TEST_WIN0_OFFSET (RES_TEST_HOLE0_OFFSET + RES_TEST_HOLE0_SIZE)
+#define RES_TEST_WIN0_SIZE SZ_1M
+#define RES_TEST_RAM1_OFFSET (RES_TEST_WIN0_OFFSET + RES_TEST_WIN0_SIZE)
+#define RES_TEST_RAM1_SIZE SZ_1M
+#define RES_TEST_WIN1_OFFSET (RES_TEST_RAM1_OFFSET + RES_TEST_RAM1_SIZE)
+#define RES_TEST_WIN1_SIZE (SZ_1M * 3)
+#define RES_TEST_RAM2_OFFSET RES_TEST_WIN1_OFFSET
+#define RES_TEST_RAM2_SIZE SZ_1M
+#define RES_TEST_CODE_OFFSET (RES_TEST_RAM2_OFFSET + SZ_128K)
+#define RES_TEST_CODE_SIZE SZ_128K
+#define RES_TEST_RAM3_OFFSET (RES_TEST_RAM2_OFFSET + RES_TEST_RAM2_SIZE)
+#define RES_TEST_RAM3_SIZE SZ_1M
+#define RES_TEST_TOTAL_SIZE ((RES_TEST_WIN1_OFFSET + RES_TEST_WIN1_SIZE))
+
+KUNIT_DEFINE_ACTION_WRAPPER(kfree_wrapper, kfree, const void *);
+
+static void remove_free_resource(void *ctx)
+{
+ struct resource *res = (struct resource *)ctx;
+
+ remove_resource(res);
+ kfree(res);
+}
+
+static void resource_test_add_action_or_abort(
+ struct kunit *test, void (*action)(void *), void *ctx)
+{
+ KUNIT_ASSERT_EQ_MSG(test, 0,
+ kunit_add_action_or_reset(test, action, ctx),
+ "Fail to add action");
+}
+
+static void resource_test_request_region(struct kunit *test, struct resource *parent,
+ resource_size_t start, resource_size_t size,
+ const char *name, unsigned long flags)
+{
+ struct resource *res;
+
+ res = __request_region(parent, start, size, name, flags);
+ KUNIT_ASSERT_NOT_NULL(test, res);
+ resource_test_add_action_or_abort(test, remove_free_resource, res);
+}
+
+static void resource_test_insert_resource(struct kunit *test, struct resource *parent,
+ resource_size_t start, resource_size_t size,
+ const char *name, unsigned long flags)
+{
+ struct resource *res;
+
+ res = kzalloc(sizeof(*res), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, res);
+
+ res->name = name;
+ res->start = start;
+ res->end = start + size - 1;
+ res->flags = flags;
+ if (insert_resource(parent, res)) {
+ resource_test_add_action_or_abort(test, kfree_wrapper, res);
+ KUNIT_FAIL_AND_ABORT(test, "Fail to insert resource %pR\n", res);
+ }
+
+ resource_test_add_action_or_abort(test, remove_free_resource, res);
+}
+
+static void resource_test_region_intersects(struct kunit *test)
+{
+ unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ struct resource *parent;
+ resource_size_t start;
+
+ /* Find an iomem_resource hole to hold test resources */
+ parent = alloc_free_mem_region(&iomem_resource, RES_TEST_TOTAL_SIZE, SZ_1M,
+ "test resources");
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
+ start = parent->start;
+ resource_test_add_action_or_abort(test, remove_free_resource, parent);
+
+ resource_test_request_region(test, parent, start + RES_TEST_RAM0_OFFSET,
+ RES_TEST_RAM0_SIZE, "Test System RAM 0", flags);
+ resource_test_insert_resource(test, parent, start + RES_TEST_WIN0_OFFSET,
+ RES_TEST_WIN0_SIZE, "Test CXL Window 0",
+ IORESOURCE_MEM);
+ resource_test_request_region(test, parent, start + RES_TEST_RAM1_OFFSET,
+ RES_TEST_RAM1_SIZE, "Test System RAM 1", flags);
+ resource_test_insert_resource(test, parent, start + RES_TEST_WIN1_OFFSET,
+ RES_TEST_WIN1_SIZE, "Test CXL Window 1",
+ IORESOURCE_MEM);
+ resource_test_request_region(test, parent, start + RES_TEST_RAM2_OFFSET,
+ RES_TEST_RAM2_SIZE, "Test System RAM 2", flags);
+ resource_test_insert_resource(test, parent, start + RES_TEST_CODE_OFFSET,
+ RES_TEST_CODE_SIZE, "Test Code", flags);
+ resource_test_request_region(test, parent, start + RES_TEST_RAM3_OFFSET,
+ RES_TEST_RAM3_SIZE, "Test System RAM 3", flags);
+ kunit_release_action(test, remove_free_resource, parent);
+
+ KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
+ region_intersects(start + RES_TEST_RAM0_OFFSET, PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
+ region_intersects(start + RES_TEST_RAM0_OFFSET +
+ RES_TEST_RAM0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_DISJOINT,
+ region_intersects(start + RES_TEST_HOLE0_OFFSET, PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_DISJOINT,
+ region_intersects(start + RES_TEST_HOLE0_OFFSET +
+ RES_TEST_HOLE0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_MIXED,
+ region_intersects(start + RES_TEST_WIN0_OFFSET +
+ RES_TEST_WIN0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
+ region_intersects(start + RES_TEST_RAM1_OFFSET +
+ RES_TEST_RAM1_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
+ region_intersects(start + RES_TEST_RAM2_OFFSET +
+ RES_TEST_RAM2_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
+ region_intersects(start + RES_TEST_CODE_OFFSET, PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
+ region_intersects(start + RES_TEST_RAM2_OFFSET,
+ RES_TEST_RAM2_SIZE + PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+ KUNIT_EXPECT_EQ(test, REGION_MIXED,
+ region_intersects(start + RES_TEST_RAM3_OFFSET,
+ RES_TEST_RAM3_SIZE + PAGE_SIZE,
+ IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
+}
+
+static struct kunit_case resource_test_cases[] = {
+ KUNIT_CASE(resource_test_union),
+ KUNIT_CASE(resource_test_intersection),
+ KUNIT_CASE(resource_test_region_intersects),
+ {}
+};
+
+static struct kunit_suite resource_test_suite = {
+ .name = "resource",
+ .test_cases = resource_test_cases,
+};
+kunit_test_suite(resource_test_suite);
+
+MODULE_DESCRIPTION("I/O Port & Memory Resource manager unit tests");
+MODULE_LICENSE("GPL");
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