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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246// SPDX-License-Identifier: GPL-2.0#include <inttypes.h>#include <linux/compiler.h>#include <linux/kernel.h>#include "tests.h"#include "map.h"#include "maps.h"#include "dso.h"#include "debug.h"
struct map_def { const char *name; u64 start; u64 end;};
struct check_maps_cb_args { struct map_def *merged; unsigned int i;};
static int check_maps_cb(struct map *map, void *data){ struct check_maps_cb_args *args = data; struct map_def *merged = &args->merged[args->i];
if (map__start(map) != merged->start || map__end(map) != merged->end || strcmp(dso__name(map__dso(map)), merged->name) || refcount_read(map__refcnt(map)) != 1) { return 1; } args->i++; return 0;}
static int failed_cb(struct map *map, void *data __maybe_unused){ pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: %d\n", map__start(map), map__end(map), dso__name(map__dso(map)), refcount_read(map__refcnt(map)));
return 0;}
static int check_maps(struct map_def *merged, unsigned int size, struct maps *maps){ bool failed = false;
if (maps__nr_maps(maps) != size) { pr_debug("Expected %d maps, got %d", size, maps__nr_maps(maps)); failed = true; } else { struct check_maps_cb_args args = { .merged = merged, .i = 0, }; failed = maps__for_each_map(maps, check_maps_cb, &args); } if (failed) { pr_debug("Expected:\n"); for (unsigned int i = 0; i < size; i++) { pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: 1\n", merged[i].start, merged[i].end, merged[i].name); } pr_debug("Got:\n"); maps__for_each_map(maps, failed_cb, NULL); } return failed ? TEST_FAIL : TEST_OK;}
static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused){ unsigned int i; struct map_def bpf_progs[] = { { "bpf_prog_1", 200, 300 }, { "bpf_prog_2", 500, 600 }, { "bpf_prog_3", 800, 900 }, }; struct map_def merged12[] = { { "kcore1", 100, 200 }, { "bpf_prog_1", 200, 300 }, { "kcore1", 300, 500 }, { "bpf_prog_2", 500, 600 }, { "kcore1", 600, 800 }, { "bpf_prog_3", 800, 900 }, { "kcore1", 900, 1000 }, }; struct map_def merged3[] = { { "kcore1", 100, 200 }, { "bpf_prog_1", 200, 300 }, { "kcore1", 300, 500 }, { "bpf_prog_2", 500, 600 }, { "kcore1", 600, 800 }, { "bpf_prog_3", 800, 900 }, { "kcore1", 900, 1000 }, { "kcore3", 1000, 1100 }, }; struct map *map_kcore1, *map_kcore2, *map_kcore3; int ret; struct maps *maps = maps__new(NULL);
TEST_ASSERT_VAL("failed to create maps", maps);
for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) { struct map *map;
map = dso__new_map(bpf_progs[i].name); TEST_ASSERT_VAL("failed to create map", map);
map__set_start(map, bpf_progs[i].start); map__set_end(map, bpf_progs[i].end); TEST_ASSERT_VAL("failed to insert map", maps__insert(maps, map) == 0); map__put(map); }
map_kcore1 = dso__new_map("kcore1"); TEST_ASSERT_VAL("failed to create map", map_kcore1);
map_kcore2 = dso__new_map("kcore2"); TEST_ASSERT_VAL("failed to create map", map_kcore2);
map_kcore3 = dso__new_map("kcore3"); TEST_ASSERT_VAL("failed to create map", map_kcore3);
/* kcore1 map overlaps over all bpf maps */ map__set_start(map_kcore1, 100); map__set_end(map_kcore1, 1000);
/* kcore2 map hides behind bpf_prog_2 */ map__set_start(map_kcore2, 550); map__set_end(map_kcore2, 570);
/* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */ map__set_start(map_kcore3, 880); map__set_end(map_kcore3, 1100);
ret = maps__merge_in(maps, map_kcore1); TEST_ASSERT_VAL("failed to merge map", !ret);
ret = check_maps(merged12, ARRAY_SIZE(merged12), maps); TEST_ASSERT_VAL("merge check failed", !ret);
ret = maps__merge_in(maps, map_kcore2); TEST_ASSERT_VAL("failed to merge map", !ret);
ret = check_maps(merged12, ARRAY_SIZE(merged12), maps); TEST_ASSERT_VAL("merge check failed", !ret);
ret = maps__merge_in(maps, map_kcore3); TEST_ASSERT_VAL("failed to merge map", !ret);
ret = check_maps(merged3, ARRAY_SIZE(merged3), maps); TEST_ASSERT_VAL("merge check failed", !ret);
maps__zput(maps); map__zput(map_kcore1); map__zput(map_kcore2); map__zput(map_kcore3); return TEST_OK;}
static int test__maps__fixup_overlap_and_insert(struct test_suite *t __maybe_unused, int subtest __maybe_unused){ struct map_def initial_maps[] = { { "target_map", 1000, 2000 }, { "next_map", 3000, 4000 }, }; struct map_def insert_split = { "split_map", 1400, 1600 }; struct map_def expected_after_split[] = { { "target_map", 1000, 1400 }, { "split_map", 1400, 1600 }, { "target_map", 1600, 2000 }, { "next_map", 3000, 4000 }, };
struct map_def insert_eclipse = { "eclipse_map", 2500, 4500 }; struct map_def expected_final[] = { { "target_map", 1000, 1400 }, { "split_map", 1400, 1600 }, { "target_map", 1600, 2000 }, { "eclipse_map", 2500, 4500 }, /* "next_map" (3000-4000) is removed */ };
struct map *map_split, *map_eclipse; int ret; unsigned int i; struct maps *maps = maps__new(NULL);
TEST_ASSERT_VAL("failed to create maps", maps);
for (i = 0; i < ARRAY_SIZE(initial_maps); i++) { struct map *map = dso__new_map(initial_maps[i].name);
TEST_ASSERT_VAL("failed to create map", map); map__set_start(map, initial_maps[i].start); map__set_end(map, initial_maps[i].end); TEST_ASSERT_VAL("failed to insert map", maps__insert(maps, map) == 0); map__put(map); }
// Check splitting. map_split = dso__new_map(insert_split.name); TEST_ASSERT_VAL("failed to create split map", map_split); map__set_start(map_split, insert_split.start); map__set_end(map_split, insert_split.end);
ret = maps__fixup_overlap_and_insert(maps, map_split); TEST_ASSERT_VAL("failed to fixup and insert split map", !ret);
map__zput(map_split); ret = check_maps(expected_after_split, ARRAY_SIZE(expected_after_split), maps); TEST_ASSERT_VAL("split check failed", !ret);
// Check cover 1 map with another. map_eclipse = dso__new_map(insert_eclipse.name); TEST_ASSERT_VAL("failed to create eclipse map", map_eclipse); map__set_start(map_eclipse, insert_eclipse.start); map__set_end(map_eclipse, insert_eclipse.end);
ret = maps__fixup_overlap_and_insert(maps, map_eclipse); TEST_ASSERT_VAL("failed to fixup and insert eclipse map", !ret);
map__zput(map_eclipse); ret = check_maps(expected_final, ARRAY_SIZE(expected_final), maps); TEST_ASSERT_VAL("eclipse check failed", !ret);
maps__zput(maps); return TEST_OK;}
static struct test_case tests__maps[] = { TEST_CASE("Test merge_in interface", maps__merge_in), TEST_CASE("Test fix up overlap interface", maps__fixup_overlap_and_insert), { .name = NULL, }};
struct test_suite suite__maps = { .desc = "Maps - per process mmaps abstraction", .test_cases = tests__maps,};