1 /* 2 * multiorder.c: Multi-order radix tree entry testing 3 * Copyright (c) 2016 Intel Corporation 4 * Author: Ross Zwisler <ross.zwisler@linux.intel.com> 5 * Author: Matthew Wilcox <matthew.r.wilcox@intel.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 */ 16 #include <linux/radix-tree.h> 17 #include <linux/slab.h> 18 #include <linux/errno.h> 19 20 #include "test.h" 21 22 #define for_each_index(i, base, order) \ 23 for (i = base; i < base + (1 << order); i++) 24 25 static void __multiorder_tag_test(int index, int order) 26 { 27 RADIX_TREE(tree, GFP_KERNEL); 28 int base, err, i; 29 unsigned long first = 0; 30 31 /* our canonical entry */ 32 base = index & ~((1 << order) - 1); 33 34 printf("Multiorder tag test with index %d, canonical entry %d\n", 35 index, base); 36 37 err = item_insert_order(&tree, index, order); 38 assert(!err); 39 40 /* 41 * Verify we get collisions for covered indices. We try and fail to 42 * insert an exceptional entry so we don't leak memory via 43 * item_insert_order(). 44 */ 45 for_each_index(i, base, order) { 46 err = __radix_tree_insert(&tree, i, order, 47 (void *)(0xA0 | RADIX_TREE_EXCEPTIONAL_ENTRY)); 48 assert(err == -EEXIST); 49 } 50 51 for_each_index(i, base, order) { 52 assert(!radix_tree_tag_get(&tree, i, 0)); 53 assert(!radix_tree_tag_get(&tree, i, 1)); 54 } 55 56 assert(radix_tree_tag_set(&tree, index, 0)); 57 58 for_each_index(i, base, order) { 59 assert(radix_tree_tag_get(&tree, i, 0)); 60 assert(!radix_tree_tag_get(&tree, i, 1)); 61 } 62 63 assert(radix_tree_range_tag_if_tagged(&tree, &first, ~0UL, 10, 0, 1) == 1); 64 assert(radix_tree_tag_clear(&tree, index, 0)); 65 66 for_each_index(i, base, order) { 67 assert(!radix_tree_tag_get(&tree, i, 0)); 68 assert(radix_tree_tag_get(&tree, i, 1)); 69 } 70 71 assert(radix_tree_tag_clear(&tree, index, 1)); 72 73 assert(!radix_tree_tagged(&tree, 0)); 74 assert(!radix_tree_tagged(&tree, 1)); 75 76 item_kill_tree(&tree); 77 } 78 79 static void multiorder_tag_tests(void) 80 { 81 /* test multi-order entry for indices 0-7 with no sibling pointers */ 82 __multiorder_tag_test(0, 3); 83 __multiorder_tag_test(5, 3); 84 85 /* test multi-order entry for indices 8-15 with no sibling pointers */ 86 __multiorder_tag_test(8, 3); 87 __multiorder_tag_test(15, 3); 88 89 /* 90 * Our order 5 entry covers indices 0-31 in a tree with height=2. 91 * This is broken up as follows: 92 * 0-7: canonical entry 93 * 8-15: sibling 1 94 * 16-23: sibling 2 95 * 24-31: sibling 3 96 */ 97 __multiorder_tag_test(0, 5); 98 __multiorder_tag_test(29, 5); 99 100 /* same test, but with indices 32-63 */ 101 __multiorder_tag_test(32, 5); 102 __multiorder_tag_test(44, 5); 103 104 /* 105 * Our order 8 entry covers indices 0-255 in a tree with height=3. 106 * This is broken up as follows: 107 * 0-63: canonical entry 108 * 64-127: sibling 1 109 * 128-191: sibling 2 110 * 192-255: sibling 3 111 */ 112 __multiorder_tag_test(0, 8); 113 __multiorder_tag_test(190, 8); 114 115 /* same test, but with indices 256-511 */ 116 __multiorder_tag_test(256, 8); 117 __multiorder_tag_test(300, 8); 118 119 __multiorder_tag_test(0x12345678UL, 8); 120 } 121 122 static void multiorder_check(unsigned long index, int order) 123 { 124 unsigned long i; 125 unsigned long min = index & ~((1UL << order) - 1); 126 unsigned long max = min + (1UL << order); 127 RADIX_TREE(tree, GFP_KERNEL); 128 129 printf("Multiorder index %ld, order %d\n", index, order); 130 131 assert(item_insert_order(&tree, index, order) == 0); 132 133 for (i = min; i < max; i++) { 134 struct item *item = item_lookup(&tree, i); 135 assert(item != 0); 136 assert(item->index == index); 137 } 138 for (i = 0; i < min; i++) 139 item_check_absent(&tree, i); 140 for (i = max; i < 2*max; i++) 141 item_check_absent(&tree, i); 142 for (i = min; i < max; i++) { 143 static void *entry = (void *) 144 (0xA0 | RADIX_TREE_EXCEPTIONAL_ENTRY); 145 assert(radix_tree_insert(&tree, i, entry) == -EEXIST); 146 } 147 148 assert(item_delete(&tree, index) != 0); 149 150 for (i = 0; i < 2*max; i++) 151 item_check_absent(&tree, i); 152 } 153 154 static void multiorder_shrink(unsigned long index, int order) 155 { 156 unsigned long i; 157 unsigned long max = 1 << order; 158 RADIX_TREE(tree, GFP_KERNEL); 159 struct radix_tree_node *node; 160 161 printf("Multiorder shrink index %ld, order %d\n", index, order); 162 163 assert(item_insert_order(&tree, 0, order) == 0); 164 165 node = tree.rnode; 166 167 assert(item_insert(&tree, index) == 0); 168 assert(node != tree.rnode); 169 170 assert(item_delete(&tree, index) != 0); 171 assert(node == tree.rnode); 172 173 for (i = 0; i < max; i++) { 174 struct item *item = item_lookup(&tree, i); 175 assert(item != 0); 176 assert(item->index == 0); 177 } 178 for (i = max; i < 2*max; i++) 179 item_check_absent(&tree, i); 180 181 if (!item_delete(&tree, 0)) { 182 printf("failed to delete index %ld (order %d)\n", index, order); abort(); 183 } 184 185 for (i = 0; i < 2*max; i++) 186 item_check_absent(&tree, i); 187 } 188 189 static void multiorder_insert_bug(void) 190 { 191 RADIX_TREE(tree, GFP_KERNEL); 192 193 item_insert(&tree, 0); 194 radix_tree_tag_set(&tree, 0, 0); 195 item_insert_order(&tree, 3 << 6, 6); 196 197 item_kill_tree(&tree); 198 } 199 200 void multiorder_iteration(void) 201 { 202 RADIX_TREE(tree, GFP_KERNEL); 203 struct radix_tree_iter iter; 204 void **slot; 205 int i, err; 206 207 printf("Multiorder iteration test\n"); 208 209 #define NUM_ENTRIES 11 210 int index[NUM_ENTRIES] = {0, 2, 4, 8, 16, 32, 34, 36, 64, 72, 128}; 211 int order[NUM_ENTRIES] = {1, 1, 2, 3, 4, 1, 0, 1, 3, 0, 7}; 212 213 for (i = 0; i < NUM_ENTRIES; i++) { 214 err = item_insert_order(&tree, index[i], order[i]); 215 assert(!err); 216 } 217 218 i = 0; 219 /* start from index 1 to verify we find the multi-order entry at 0 */ 220 radix_tree_for_each_slot(slot, &tree, &iter, 1) { 221 int height = order[i] / RADIX_TREE_MAP_SHIFT; 222 int shift = height * RADIX_TREE_MAP_SHIFT; 223 224 assert(iter.index == index[i]); 225 assert(iter.shift == shift); 226 i++; 227 } 228 229 /* 230 * Now iterate through the tree starting at an elevated multi-order 231 * entry, beginning at an index in the middle of the range. 232 */ 233 i = 8; 234 radix_tree_for_each_slot(slot, &tree, &iter, 70) { 235 int height = order[i] / RADIX_TREE_MAP_SHIFT; 236 int shift = height * RADIX_TREE_MAP_SHIFT; 237 238 assert(iter.index == index[i]); 239 assert(iter.shift == shift); 240 i++; 241 } 242 243 item_kill_tree(&tree); 244 } 245 246 void multiorder_tagged_iteration(void) 247 { 248 RADIX_TREE(tree, GFP_KERNEL); 249 struct radix_tree_iter iter; 250 void **slot; 251 unsigned long first = 0; 252 int i; 253 254 printf("Multiorder tagged iteration test\n"); 255 256 #define MT_NUM_ENTRIES 9 257 int index[MT_NUM_ENTRIES] = {0, 2, 4, 16, 32, 40, 64, 72, 128}; 258 int order[MT_NUM_ENTRIES] = {1, 0, 2, 4, 3, 1, 3, 0, 7}; 259 260 #define TAG_ENTRIES 7 261 int tag_index[TAG_ENTRIES] = {0, 4, 16, 40, 64, 72, 128}; 262 263 for (i = 0; i < MT_NUM_ENTRIES; i++) 264 assert(!item_insert_order(&tree, index[i], order[i])); 265 266 assert(!radix_tree_tagged(&tree, 1)); 267 268 for (i = 0; i < TAG_ENTRIES; i++) 269 assert(radix_tree_tag_set(&tree, tag_index[i], 1)); 270 271 i = 0; 272 /* start from index 1 to verify we find the multi-order entry at 0 */ 273 radix_tree_for_each_tagged(slot, &tree, &iter, 1, 1) { 274 assert(iter.index == tag_index[i]); 275 i++; 276 } 277 278 /* 279 * Now iterate through the tree starting at an elevated multi-order 280 * entry, beginning at an index in the middle of the range. 281 */ 282 i = 4; 283 radix_tree_for_each_slot(slot, &tree, &iter, 70) { 284 assert(iter.index == tag_index[i]); 285 i++; 286 } 287 288 radix_tree_range_tag_if_tagged(&tree, &first, ~0UL, 289 MT_NUM_ENTRIES, 1, 2); 290 291 i = 0; 292 radix_tree_for_each_tagged(slot, &tree, &iter, 1, 2) { 293 assert(iter.index == tag_index[i]); 294 i++; 295 } 296 297 first = 1; 298 radix_tree_range_tag_if_tagged(&tree, &first, ~0UL, 299 MT_NUM_ENTRIES, 1, 0); 300 i = 0; 301 radix_tree_for_each_tagged(slot, &tree, &iter, 0, 0) { 302 assert(iter.index == tag_index[i]); 303 i++; 304 } 305 306 item_kill_tree(&tree); 307 } 308 309 void multiorder_checks(void) 310 { 311 int i; 312 313 for (i = 0; i < 20; i++) { 314 multiorder_check(200, i); 315 multiorder_check(0, i); 316 multiorder_check((1UL << i) + 1, i); 317 } 318 319 for (i = 0; i < 15; i++) 320 multiorder_shrink((1UL << (i + RADIX_TREE_MAP_SHIFT)), i); 321 322 multiorder_insert_bug(); 323 multiorder_tag_tests(); 324 multiorder_iteration(); 325 multiorder_tagged_iteration(); 326 } 327