ida: Start new test_ida module

Start transitioning the IDA tests into kernel space.  Framework heavily
cribbed from test_xarray.c.

Signed-off-by: Matthew Wilcox <willy@infradead.org>

lib/Kconfig.debug

@@ -1827,6 +1827,9 @@ config TEST_HASH
 	  This is intended to help people writing architecture-specific
 	  optimized versions.  If unsure, say N.
 
+config TEST_IDA
+	tristate "Perform selftest on IDA functions"
+
 config TEST_PARMAN
 	tristate "Perform selftest on priority array manager"
 	default n

lib/Makefile

@@ -50,6 +50,7 @@ obj-$(CONFIG_TEST_BPF) += test_bpf.o
 obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
 obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
 obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o
+obj-$(CONFIG_TEST_IDA) += test_ida.o
 obj-$(CONFIG_TEST_KASAN) += test_kasan.o
 CFLAGS_test_kasan.o += -fno-builtin
 obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o

lib/test_ida.c

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * test_ida.c: Test the IDA API
+ * Copyright (c) 2016-2018 Microsoft Corporation
+ * Copyright (c) 2018 Oracle Corporation
+ * Author: Matthew Wilcox <willy@infradead.org>
+ */
+
+#include <linux/idr.h>
+#include <linux/module.h>
+
+static unsigned int tests_run;
+static unsigned int tests_passed;
+
+#ifdef __KERNEL__
+void ida_dump(struct ida *ida) { }
+#endif
+#define IDA_BUG_ON(ida, x) do {						\
+	tests_run++;							\
+	if (x) {							\
+		ida_dump(ida);						\
+		dump_stack();						\
+	} else {							\
+		tests_passed++;						\
+	}								\
+} while (0)
+
+static int ida_checks(void)
+{
+	DEFINE_IDA(ida);
+
+	IDA_BUG_ON(&ida, !ida_is_empty(&ida));
+
+	printk("IDA: %u of %u tests passed\n", tests_passed, tests_run);
+	return (tests_run != tests_passed) ? 0 : -EINVAL;
+}
+
+static void ida_exit(void)
+{
+}
+
+module_init(ida_checks);
+module_exit(ida_exit);
+MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
+MODULE_LICENSE("GPL");

tools/testing/radix-tree/Makefile

@@ -22,6 +22,7 @@ targets: generated/map-shift.h $(TARGETS)
 
 main:	$(OFILES)
 
+idr-test.o: ../../../lib/test_ida.c
 idr-test: idr-test.o $(CORE_OFILES)
 
 multiorder: multiorder.o $(CORE_OFILES)

tools/testing/radix-tree/idr-test.c

@@ -309,6 +309,15 @@ void idr_checks(void)
 	idr_u32_test(0);
 }
 
+#define module_init(x)
+#define module_exit(x)
+#define MODULE_AUTHOR(x)
+#define MODULE_LICENSE(x)
+#define dump_stack()    assert(0)
+void ida_dump(struct ida *);
+
+#include "../../../lib/test_ida.c"
+
 /*
  * Check that we get the correct error when we run out of memory doing
  * allocations.  To ensure we run out of memory, just "forget" to preload.
@@ -488,7 +497,7 @@ void ida_simple_get_remove_test(void)
 	ida_destroy(&ida);
 }
 
-void ida_checks(void)
+void user_ida_checks(void)
 {
 	DEFINE_IDA(ida);
 	int id;
@@ -582,12 +591,19 @@ void ida_thread_tests(void)
 		pthread_join(threads[i], NULL);
 }
 
+void ida_tests(void)
+{
+	user_ida_checks();
+	ida_checks();
+	ida_exit();
+	ida_thread_tests();
+}
+
 int __weak main(void)
 {
 	radix_tree_init();
 	idr_checks();
-	ida_checks();
-	ida_thread_tests();
+	ida_tests();
 	radix_tree_cpu_dead(1);
 	rcu_barrier();
 	if (nr_allocated)

tools/testing/radix-tree/main.c

@@ -324,7 +324,7 @@ static void single_thread_tests(bool long_run)
 	printv(2, "after dynamic_height_check: %d allocated, preempt %d\n",
 		nr_allocated, preempt_count);
 	idr_checks();
-	ida_checks();
+	ida_tests();
 	rcu_barrier();
 	printv(2, "after idr_checks: %d allocated, preempt %d\n",
 		nr_allocated, preempt_count);
@@ -371,7 +371,6 @@ int main(int argc, char **argv)
 	iteration_test(0, 10 + 90 * long_run);
 	iteration_test(7, 10 + 90 * long_run);
 	single_thread_tests(long_run);
-	ida_thread_tests();
 
 	/* Free any remaining preallocated nodes */
 	radix_tree_cpu_dead(0);

tools/testing/radix-tree/test.h

@@ -39,8 +39,7 @@ void multiorder_checks(void);
 void iteration_test(unsigned order, unsigned duration);
 void benchmark(void);
 void idr_checks(void);
-void ida_checks(void);
-void ida_thread_tests(void);
+void ida_tests(void);
 
 struct item *
 item_tag_set(struct radix_tree_root *root, unsigned long index, int tag);