1 // SPDX-License-Identifier: GPL-2.0 2 #include <inttypes.h> 3 #include <linux/compiler.h> 4 #include <linux/kernel.h> 5 #include "tests.h" 6 #include "map.h" 7 #include "maps.h" 8 #include "dso.h" 9 #include "debug.h" 10 11 struct map_def { 12 const char *name; 13 u64 start; 14 u64 end; 15 }; 16 17 struct check_maps_cb_args { 18 struct map_def *merged; 19 unsigned int i; 20 }; 21 22 static int check_maps_cb(struct map *map, void *data) 23 { 24 struct check_maps_cb_args *args = data; 25 struct map_def *merged = &args->merged[args->i]; 26 27 if (map__start(map) != merged->start || 28 map__end(map) != merged->end || 29 strcmp(map__dso(map)->name, merged->name) || 30 refcount_read(map__refcnt(map)) != 1) { 31 return 1; 32 } 33 args->i++; 34 return 0; 35 } 36 37 static int failed_cb(struct map *map, void *data __maybe_unused) 38 { 39 pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: %d\n", 40 map__start(map), 41 map__end(map), 42 map__dso(map)->name, 43 refcount_read(map__refcnt(map))); 44 45 return 0; 46 } 47 48 static int check_maps(struct map_def *merged, unsigned int size, struct maps *maps) 49 { 50 bool failed = false; 51 52 if (maps__nr_maps(maps) != size) { 53 pr_debug("Expected %d maps, got %d", size, maps__nr_maps(maps)); 54 failed = true; 55 } else { 56 struct check_maps_cb_args args = { 57 .merged = merged, 58 .i = 0, 59 }; 60 failed = maps__for_each_map(maps, check_maps_cb, &args); 61 } 62 if (failed) { 63 pr_debug("Expected:\n"); 64 for (unsigned int i = 0; i < size; i++) { 65 pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: 1\n", 66 merged[i].start, merged[i].end, merged[i].name); 67 } 68 pr_debug("Got:\n"); 69 maps__for_each_map(maps, failed_cb, NULL); 70 } 71 return failed ? TEST_FAIL : TEST_OK; 72 } 73 74 static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused) 75 { 76 unsigned int i; 77 struct map_def bpf_progs[] = { 78 { "bpf_prog_1", 200, 300 }, 79 { "bpf_prog_2", 500, 600 }, 80 { "bpf_prog_3", 800, 900 }, 81 }; 82 struct map_def merged12[] = { 83 { "kcore1", 100, 200 }, 84 { "bpf_prog_1", 200, 300 }, 85 { "kcore1", 300, 500 }, 86 { "bpf_prog_2", 500, 600 }, 87 { "kcore1", 600, 800 }, 88 { "bpf_prog_3", 800, 900 }, 89 { "kcore1", 900, 1000 }, 90 }; 91 struct map_def merged3[] = { 92 { "kcore1", 100, 200 }, 93 { "bpf_prog_1", 200, 300 }, 94 { "kcore1", 300, 500 }, 95 { "bpf_prog_2", 500, 600 }, 96 { "kcore1", 600, 800 }, 97 { "bpf_prog_3", 800, 900 }, 98 { "kcore1", 900, 1000 }, 99 { "kcore3", 1000, 1100 }, 100 }; 101 struct map *map_kcore1, *map_kcore2, *map_kcore3; 102 int ret; 103 struct maps *maps = maps__new(NULL); 104 105 TEST_ASSERT_VAL("failed to create maps", maps); 106 107 for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) { 108 struct map *map; 109 110 map = dso__new_map(bpf_progs[i].name); 111 TEST_ASSERT_VAL("failed to create map", map); 112 113 map__set_start(map, bpf_progs[i].start); 114 map__set_end(map, bpf_progs[i].end); 115 TEST_ASSERT_VAL("failed to insert map", maps__insert(maps, map) == 0); 116 map__put(map); 117 } 118 119 map_kcore1 = dso__new_map("kcore1"); 120 TEST_ASSERT_VAL("failed to create map", map_kcore1); 121 122 map_kcore2 = dso__new_map("kcore2"); 123 TEST_ASSERT_VAL("failed to create map", map_kcore2); 124 125 map_kcore3 = dso__new_map("kcore3"); 126 TEST_ASSERT_VAL("failed to create map", map_kcore3); 127 128 /* kcore1 map overlaps over all bpf maps */ 129 map__set_start(map_kcore1, 100); 130 map__set_end(map_kcore1, 1000); 131 132 /* kcore2 map hides behind bpf_prog_2 */ 133 map__set_start(map_kcore2, 550); 134 map__set_end(map_kcore2, 570); 135 136 /* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */ 137 map__set_start(map_kcore3, 880); 138 map__set_end(map_kcore3, 1100); 139 140 ret = maps__merge_in(maps, map_kcore1); 141 TEST_ASSERT_VAL("failed to merge map", !ret); 142 143 ret = check_maps(merged12, ARRAY_SIZE(merged12), maps); 144 TEST_ASSERT_VAL("merge check failed", !ret); 145 146 ret = maps__merge_in(maps, map_kcore2); 147 TEST_ASSERT_VAL("failed to merge map", !ret); 148 149 ret = check_maps(merged12, ARRAY_SIZE(merged12), maps); 150 TEST_ASSERT_VAL("merge check failed", !ret); 151 152 ret = maps__merge_in(maps, map_kcore3); 153 TEST_ASSERT_VAL("failed to merge map", !ret); 154 155 ret = check_maps(merged3, ARRAY_SIZE(merged3), maps); 156 TEST_ASSERT_VAL("merge check failed", !ret); 157 158 maps__zput(maps); 159 return TEST_OK; 160 } 161 162 DEFINE_SUITE("maps__merge_in", maps__merge_in); 163