1 files changed, 296 insertions, 0 deletions
diff --git a/tools/testing/radix-tree/multiorder.c b/tools/testing/radix-tree/multiorder.c
new file mode 100644
index 000000000..cffaf2245
--- /dev/null
+++ b/tools/testing/radix-tree/multiorder.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * multiorder.c: Multi-order radix tree entry testing
+ * Copyright (c) 2016 Intel Corporation
+ * Author: Ross Zwisler <ross.zwisler@linux.intel.com>
+ * Author: Matthew Wilcox <matthew.r.wilcox@intel.com>
+ */
+#include <linux/radix-tree.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <pthread.h>
+
+#include "test.h"
+
+static int item_insert_order(struct xarray *xa, unsigned long index,
+			unsigned order)
+{
+	XA_STATE_ORDER(xas, xa, index, order);
+	struct item *item = item_create(index, order);
+
+	do {
+		xas_lock(&xas);
+		xas_store(&xas, item);
+		xas_unlock(&xas);
+	} while (xas_nomem(&xas, GFP_KERNEL));
+
+	if (!xas_error(&xas))
+		return 0;
+
+	free(item);
+	return xas_error(&xas);
+}
+
+void multiorder_iteration(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	struct item *item;
+	int i, j, err;
+
+#define NUM_ENTRIES 11
+	int index[NUM_ENTRIES] = {0, 2, 4, 8, 16, 32, 34, 36, 64, 72, 128};
+	int order[NUM_ENTRIES] = {1, 1, 2, 3,  4,  1,  0,  1,  3,  0, 7};
+
+	printv(1, "Multiorder iteration test\n");
+
+	for (i = 0; i < NUM_ENTRIES; i++) {
+		err = item_insert_order(xa, index[i], order[i]);
+		assert(!err);
+	}
+
+	for (j = 0; j < 256; j++) {
+		for (i = 0; i < NUM_ENTRIES; i++)
+			if (j <= (index[i] | ((1 << order[i]) - 1)))
+				break;
+
+		xas_set(&xas, j);
+		xas_for_each(&xas, item, ULONG_MAX) {
+			int height = order[i] / XA_CHUNK_SHIFT;
+			int shift = height * XA_CHUNK_SHIFT;
+			unsigned long mask = (1UL << order[i]) - 1;
+
+			assert((xas.xa_index | mask) == (index[i] | mask));
+			assert(xas.xa_node->shift == shift);
+			assert(!radix_tree_is_internal_node(item));
+			assert((item->index | mask) == (index[i] | mask));
+			assert(item->order == order[i]);
+			i++;
+		}
+	}
+
+	item_kill_tree(xa);
+}
+
+void multiorder_tagged_iteration(struct xarray *xa)
+{
+	XA_STATE(xas, xa, 0);
+	struct item *item;
+	int i, j;
+
+#define MT_NUM_ENTRIES 9
+	int index[MT_NUM_ENTRIES] = {0, 2, 4, 16, 32, 40, 64, 72, 128};
+	int order[MT_NUM_ENTRIES] = {1, 0, 2, 4,  3,  1,  3,  0,   7};
+
+#define TAG_ENTRIES 7
+	int tag_index[TAG_ENTRIES] = {0, 4, 16, 40, 64, 72, 128};
+
+	printv(1, "Multiorder tagged iteration test\n");
+
+	for (i = 0; i < MT_NUM_ENTRIES; i++)
+		assert(!item_insert_order(xa, index[i], order[i]));
+
+	assert(!xa_marked(xa, XA_MARK_1));
+
+	for (i = 0; i < TAG_ENTRIES; i++)
+		xa_set_mark(xa, tag_index[i], XA_MARK_1);
+
+	for (j = 0; j < 256; j++) {
+		int k;
+
+		for (i = 0; i < TAG_ENTRIES; i++) {
+			for (k = i; index[k] < tag_index[i]; k++)
+				;
+			if (j <= (index[k] | ((1 << order[k]) - 1)))
+				break;
+		}
+
+		xas_set(&xas, j);
+		xas_for_each_marked(&xas, item, ULONG_MAX, XA_MARK_1) {
+			unsigned long mask;
+			for (k = i; index[k] < tag_index[i]; k++)
+				;
+			mask = (1UL << order[k]) - 1;
+
+			assert((xas.xa_index | mask) == (tag_index[i] | mask));
+			assert(!xa_is_internal(item));
+			assert((item->index | mask) == (tag_index[i] | mask));
+			assert(item->order == order[k]);
+			i++;
+		}
+	}
+
+	assert(tag_tagged_items(xa, 0, ULONG_MAX, TAG_ENTRIES, XA_MARK_1,
+				XA_MARK_2) == TAG_ENTRIES);
+
+	for (j = 0; j < 256; j++) {
+		int mask, k;
+
+		for (i = 0; i < TAG_ENTRIES; i++) {
+			for (k = i; index[k] < tag_index[i]; k++)
+				;
+			if (j <= (index[k] | ((1 << order[k]) - 1)))
+				break;
+		}
+
+		xas_set(&xas, j);
+		xas_for_each_marked(&xas, item, ULONG_MAX, XA_MARK_2) {
+			for (k = i; index[k] < tag_index[i]; k++)
+				;
+			mask = (1 << order[k]) - 1;
+
+			assert((xas.xa_index | mask) == (tag_index[i] | mask));
+			assert(!xa_is_internal(item));
+			assert((item->index | mask) == (tag_index[i] | mask));
+			assert(item->order == order[k]);
+			i++;
+		}
+	}
+
+	assert(tag_tagged_items(xa, 1, ULONG_MAX, MT_NUM_ENTRIES * 2, XA_MARK_1,
+				XA_MARK_0) == TAG_ENTRIES);
+	i = 0;
+	xas_set(&xas, 0);
+	xas_for_each_marked(&xas, item, ULONG_MAX, XA_MARK_0) {
+		assert(xas.xa_index == tag_index[i]);
+		i++;
+	}
+	assert(i == TAG_ENTRIES);
+
+	item_kill_tree(xa);
+}
+
+bool stop_iteration;
+
+static void *creator_func(void *ptr)
+{
+	/* 'order' is set up to ensure we have sibling entries */
+	unsigned int order = RADIX_TREE_MAP_SHIFT - 1;
+	struct radix_tree_root *tree = ptr;
+	int i;
+
+	for (i = 0; i < 10000; i++) {
+		item_insert_order(tree, 0, order);
+		item_delete_rcu(tree, 0);
+	}
+
+	stop_iteration = true;
+	return NULL;
+}
+
+static void *iterator_func(void *ptr)
+{
+	XA_STATE(xas, ptr, 0);
+	struct item *item;
+
+	while (!stop_iteration) {
+		rcu_read_lock();
+		xas_for_each(&xas, item, ULONG_MAX) {
+			if (xas_retry(&xas, item))
+				continue;
+
+			item_sanity(item, xas.xa_index);
+		}
+		rcu_read_unlock();
+	}
+	return NULL;
+}
+
+static void multiorder_iteration_race(struct xarray *xa)
+{
+	const int num_threads = sysconf(_SC_NPROCESSORS_ONLN);
+	pthread_t worker_thread[num_threads];
+	int i;
+
+	stop_iteration = false;
+	pthread_create(&worker_thread[0], NULL, &creator_func, xa);
+	for (i = 1; i < num_threads; i++)
+		pthread_create(&worker_thread[i], NULL, &iterator_func, xa);
+
+	for (i = 0; i < num_threads; i++)
+		pthread_join(worker_thread[i], NULL);
+
+	item_kill_tree(xa);
+}
+
+static void *load_creator(void *ptr)
+{
+	/* 'order' is set up to ensure we have sibling entries */
+	unsigned int order;
+	struct radix_tree_root *tree = ptr;
+	int i;
+
+	rcu_register_thread();
+	item_insert_order(tree, 3 << RADIX_TREE_MAP_SHIFT, 0);
+	item_insert_order(tree, 2 << RADIX_TREE_MAP_SHIFT, 0);
+	for (i = 0; i < 10000; i++) {
+		for (order = 1; order < RADIX_TREE_MAP_SHIFT; order++) {
+			unsigned long index = (3 << RADIX_TREE_MAP_SHIFT) -
+						(1 << order);
+			item_insert_order(tree, index, order);
+			item_delete_rcu(tree, index);
+		}
+	}
+	rcu_unregister_thread();
+
+	stop_iteration = true;
+	return NULL;
+}
+
+static void *load_worker(void *ptr)
+{
+	unsigned long index = (3 << RADIX_TREE_MAP_SHIFT) - 1;
+
+	rcu_register_thread();
+	while (!stop_iteration) {
+		struct item *item = xa_load(ptr, index);
+		assert(!xa_is_internal(item));
+	}
+	rcu_unregister_thread();
+
+	return NULL;
+}
+
+static void load_race(struct xarray *xa)
+{
+	const int num_threads = sysconf(_SC_NPROCESSORS_ONLN) * 4;
+	pthread_t worker_thread[num_threads];
+	int i;
+
+	stop_iteration = false;
+	pthread_create(&worker_thread[0], NULL, &load_creator, xa);
+	for (i = 1; i < num_threads; i++)
+		pthread_create(&worker_thread[i], NULL, &load_worker, xa);
+
+	for (i = 0; i < num_threads; i++)
+		pthread_join(worker_thread[i], NULL);
+
+	item_kill_tree(xa);
+}
+
+static DEFINE_XARRAY(array);
+
+void multiorder_checks(void)
+{
+	multiorder_iteration(&array);
+	multiorder_tagged_iteration(&array);
+	multiorder_iteration_race(&array);
+	load_race(&array);
+
+	radix_tree_cpu_dead(0);
+}
+
+int __weak main(int argc, char **argv)
+{
+	int opt;
+
+	while ((opt = getopt(argc, argv, "ls:v")) != -1) {
+		if (opt == 'v')
+			test_verbose++;
+	}
+
+	rcu_register_thread();
+	radix_tree_init();
+	multiorder_checks();
+	rcu_unregister_thread();
+	return 0;
+}