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1// SPDX-License-Identifier: GPL-2.0
2#include <stdlib.h>
3#include <assert.h>
4#include <stdio.h>
5#include <linux/types.h>
6#include <linux/kernel.h>
7#include <linux/bitops.h>
8
9#include "test.h"
10
11struct item *
12item_tag_set(struct radix_tree_root *root, unsigned long index, int tag)
13{
14 return radix_tree_tag_set(root, index, tag);
15}
16
17struct item *
18item_tag_clear(struct radix_tree_root *root, unsigned long index, int tag)
19{
20 return radix_tree_tag_clear(root, index, tag);
21}
22
23int item_tag_get(struct radix_tree_root *root, unsigned long index, int tag)
24{
25 return radix_tree_tag_get(root, index, tag);
26}
27
28struct item *item_create(unsigned long index, unsigned int order)
29{
30 struct item *ret = malloc(sizeof(*ret));
31
32 ret->index = index;
33 ret->order = order;
34 return ret;
35}
36
37int item_insert(struct radix_tree_root *root, unsigned long index)
38{
39 struct item *item = item_create(index, 0);
40 int err = radix_tree_insert(root, item->index, item);
41 if (err)
42 free(item);
43 return err;
44}
45
46void item_sanity(struct item *item, unsigned long index)
47{
48 unsigned long mask;
49 assert(!radix_tree_is_internal_node(item));
50 assert(item->order < BITS_PER_LONG);
51 mask = (1UL << item->order) - 1;
52 assert((item->index | mask) == (index | mask));
53}
54
55void item_free(struct item *item, unsigned long index)
56{
57 item_sanity(item, index);
58 free(item);
59}
60
61int item_delete(struct radix_tree_root *root, unsigned long index)
62{
63 struct item *item = radix_tree_delete(root, index);
64
65 if (!item)
66 return 0;
67
68 item_free(item, index);
69 return 1;
70}
71
72static void item_free_rcu(struct rcu_head *head)
73{
74 struct item *item = container_of(head, struct item, rcu_head);
75
76 free(item);
77}
78
79int item_delete_rcu(struct xarray *xa, unsigned long index)
80{
81 struct item *item = xa_erase(xa, index);
82
83 if (item) {
84 item_sanity(item, index);
85 call_rcu(&item->rcu_head, item_free_rcu);
86 return 1;
87 }
88 return 0;
89}
90
91void item_check_present(struct radix_tree_root *root, unsigned long index)
92{
93 struct item *item;
94
95 item = radix_tree_lookup(root, index);
96 assert(item != NULL);
97 item_sanity(item, index);
98}
99
100struct item *item_lookup(struct radix_tree_root *root, unsigned long index)
101{
102 return radix_tree_lookup(root, index);
103}
104
105void item_check_absent(struct radix_tree_root *root, unsigned long index)
106{
107 struct item *item;
108
109 item = radix_tree_lookup(root, index);
110 assert(item == NULL);
111}
112
113/*
114 * Scan only the passed (start, start+nr] for present items
115 */
116void item_gang_check_present(struct radix_tree_root *root,
117 unsigned long start, unsigned long nr,
118 int chunk, int hop)
119{
120 struct item *items[chunk];
121 unsigned long into;
122
123 for (into = 0; into < nr; ) {
124 int nfound;
125 int nr_to_find = chunk;
126 int i;
127
128 if (nr_to_find > (nr - into))
129 nr_to_find = nr - into;
130
131 nfound = radix_tree_gang_lookup(root, (void **)items,
132 start + into, nr_to_find);
133 assert(nfound == nr_to_find);
134 for (i = 0; i < nfound; i++)
135 assert(items[i]->index == start + into + i);
136 into += hop;
137 }
138}
139
140/*
141 * Scan the entire tree, only expecting present items (start, start+nr]
142 */
143void item_full_scan(struct radix_tree_root *root, unsigned long start,
144 unsigned long nr, int chunk)
145{
146 struct item *items[chunk];
147 unsigned long into = 0;
148 unsigned long this_index = start;
149 int nfound;
150 int i;
151
152// printf("%s(0x%08lx, 0x%08lx, %d)\n", __FUNCTION__, start, nr, chunk);
153
154 while ((nfound = radix_tree_gang_lookup(root, (void **)items, into,
155 chunk))) {
156// printf("At 0x%08lx, nfound=%d\n", into, nfound);
157 for (i = 0; i < nfound; i++) {
158 assert(items[i]->index == this_index);
159 this_index++;
160 }
161// printf("Found 0x%08lx->0x%08lx\n",
162// items[0]->index, items[nfound-1]->index);
163 into = this_index;
164 }
165 if (chunk)
166 assert(this_index == start + nr);
167 nfound = radix_tree_gang_lookup(root, (void **)items,
168 this_index, chunk);
169 assert(nfound == 0);
170}
171
172/* Use the same pattern as tag_pages_for_writeback() in mm/page-writeback.c */
173int tag_tagged_items(struct xarray *xa, unsigned long start, unsigned long end,
174 unsigned batch, xa_mark_t iftag, xa_mark_t thentag)
175{
176 XA_STATE(xas, xa, start);
177 unsigned int tagged = 0;
178 struct item *item;
179
180 if (batch == 0)
181 batch = 1;
182
183 xas_lock_irq(&xas);
184 xas_for_each_marked(&xas, item, end, iftag) {
185 xas_set_mark(&xas, thentag);
186 if (++tagged % batch)
187 continue;
188
189 xas_pause(&xas);
190 xas_unlock_irq(&xas);
191 rcu_barrier();
192 xas_lock_irq(&xas);
193 }
194 xas_unlock_irq(&xas);
195
196 return tagged;
197}
198
199static int verify_node(struct radix_tree_node *slot, unsigned int tag,
200 int tagged)
201{
202 int anyset = 0;
203 int i;
204 int j;
205
206 slot = entry_to_node(slot);
207
208 /* Verify consistency at this level */
209 for (i = 0; i < RADIX_TREE_TAG_LONGS; i++) {
210 if (slot->tags[tag][i]) {
211 anyset = 1;
212 break;
213 }
214 }
215 if (tagged != anyset) {
216 printf("tag: %u, shift %u, tagged: %d, anyset: %d\n",
217 tag, slot->shift, tagged, anyset);
218 for (j = 0; j < RADIX_TREE_MAX_TAGS; j++) {
219 printf("tag %d: ", j);
220 for (i = 0; i < RADIX_TREE_TAG_LONGS; i++)
221 printf("%016lx ", slot->tags[j][i]);
222 printf("\n");
223 }
224 return 1;
225 }
226 assert(tagged == anyset);
227
228 /* Go for next level */
229 if (slot->shift > 0) {
230 for (i = 0; i < RADIX_TREE_MAP_SIZE; i++)
231 if (slot->slots[i])
232 if (verify_node(slot->slots[i], tag,
233 !!test_bit(i, slot->tags[tag]))) {
234 printf("Failure at off %d\n", i);
235 for (j = 0; j < RADIX_TREE_MAX_TAGS; j++) {
236 printf("tag %d: ", j);
237 for (i = 0; i < RADIX_TREE_TAG_LONGS; i++)
238 printf("%016lx ", slot->tags[j][i]);
239 printf("\n");
240 }
241 return 1;
242 }
243 }
244 return 0;
245}
246
247void verify_tag_consistency(struct radix_tree_root *root, unsigned int tag)
248{
249 struct radix_tree_node *node = root->xa_head;
250 if (!radix_tree_is_internal_node(node))
251 return;
252 verify_node(node, tag, !!root_tag_get(root, tag));
253}
254
255void item_kill_tree(struct xarray *xa)
256{
257 XA_STATE(xas, xa, 0);
258 void *entry;
259
260 xas_for_each(&xas, entry, ULONG_MAX) {
261 if (!xa_is_value(entry)) {
262 item_free(entry, xas.xa_index);
263 }
264 xas_store(&xas, NULL);
265 }
266
267 assert(xa_empty(xa));
268}
269
270void tree_verify_min_height(struct radix_tree_root *root, int maxindex)
271{
272 unsigned shift;
273 struct radix_tree_node *node = root->xa_head;
274 if (!radix_tree_is_internal_node(node)) {
275 assert(maxindex == 0);
276 return;
277 }
278
279 node = entry_to_node(node);
280 assert(maxindex <= node_maxindex(node));
281
282 shift = node->shift;
283 if (shift > 0)
284 assert(maxindex > shift_maxindex(shift - RADIX_TREE_MAP_SHIFT));
285 else
286 assert(maxindex > 0);
287}