LXR linux/tools/perf/tests/llvm.c

   1#include <stdio.h>
   2#include <bpf/libbpf.h>
   3#include <util/llvm-utils.h>
   4#include <util/cache.h>
   5#include "llvm.h"
   6#include "tests.h"
   7#include "debug.h"
   8#include "util.h"
   9
  10#ifdef HAVE_LIBBPF_SUPPORT
  11static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
  12{
  13        struct bpf_object *obj;
  14
  15        obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
  16        if (libbpf_get_error(obj))
  17                return TEST_FAIL;
  18        bpf_object__close(obj);
  19        return TEST_OK;
  20}
  21#else
  22static int test__bpf_parsing(void *obj_buf __maybe_unused,
  23                             size_t obj_buf_sz __maybe_unused)
  24{
  25        pr_debug("Skip bpf parsing\n");
  26        return TEST_OK;
  27}
  28#endif
  29
  30static struct {
  31        const char *source;
  32        const char *desc;
  33        bool should_load_fail;
  34} bpf_source_table[__LLVM_TESTCASE_MAX] = {
  35        [LLVM_TESTCASE_BASE] = {
  36                .source = test_llvm__bpf_base_prog,
  37                .desc = "Basic BPF llvm compile",
  38        },
  39        [LLVM_TESTCASE_KBUILD] = {
  40                .source = test_llvm__bpf_test_kbuild_prog,
  41                .desc = "kbuild searching",
  42        },
  43        [LLVM_TESTCASE_BPF_PROLOGUE] = {
  44                .source = test_llvm__bpf_test_prologue_prog,
  45                .desc = "Compile source for BPF prologue generation",
  46        },
  47        [LLVM_TESTCASE_BPF_RELOCATION] = {
  48                .source = test_llvm__bpf_test_relocation,
  49                .desc = "Compile source for BPF relocation",
  50                .should_load_fail = true,
  51        },
  52};
  53
  54int
  55test_llvm__fetch_bpf_obj(void **p_obj_buf,
  56                         size_t *p_obj_buf_sz,
  57                         enum test_llvm__testcase idx,
  58                         bool force,
  59                         bool *should_load_fail)
  60{
  61        const char *source;
  62        const char *desc;
  63        const char *tmpl_old, *clang_opt_old;
  64        char *tmpl_new = NULL, *clang_opt_new = NULL;
  65        int err, old_verbose, ret = TEST_FAIL;
  66
  67        if (idx >= __LLVM_TESTCASE_MAX)
  68                return TEST_FAIL;
  69
  70        source = bpf_source_table[idx].source;
  71        desc = bpf_source_table[idx].desc;
  72        if (should_load_fail)
  73                *should_load_fail = bpf_source_table[idx].should_load_fail;
  74
  75        /*
  76         * Skip this test if user's .perfconfig doesn't set [llvm] section
  77         * and clang is not found in $PATH, and this is not perf test -v
  78         */
  79        if (!force && (verbose <= 0 &&
  80                       !llvm_param.user_set_param &&
  81                       llvm__search_clang())) {
  82                pr_debug("No clang and no verbosive, skip this test\n");
  83                return TEST_SKIP;
  84        }
  85
  86        /*
  87         * llvm is verbosity when error. Suppress all error output if
  88         * not 'perf test -v'.
  89         */
  90        old_verbose = verbose;
  91        if (verbose == 0)
  92                verbose = -1;
  93
  94        *p_obj_buf = NULL;
  95        *p_obj_buf_sz = 0;
  96
  97        if (!llvm_param.clang_bpf_cmd_template)
  98                goto out;
  99
 100        if (!llvm_param.clang_opt)
 101                llvm_param.clang_opt = strdup("");
 102
 103        err = asprintf(&tmpl_new, "echo '%s' | %s%s", source,
 104                       llvm_param.clang_bpf_cmd_template,
 105                       old_verbose ? "" : " 2>/dev/null");
 106        if (err < 0)
 107                goto out;
 108        err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
 109        if (err < 0)
 110                goto out;
 111
 112        tmpl_old = llvm_param.clang_bpf_cmd_template;
 113        llvm_param.clang_bpf_cmd_template = tmpl_new;
 114        clang_opt_old = llvm_param.clang_opt;
 115        llvm_param.clang_opt = clang_opt_new;
 116
 117        err = llvm__compile_bpf("-", p_obj_buf, p_obj_buf_sz);
 118
 119        llvm_param.clang_bpf_cmd_template = tmpl_old;
 120        llvm_param.clang_opt = clang_opt_old;
 121
 122        verbose = old_verbose;
 123        if (err)
 124                goto out;
 125
 126        ret = TEST_OK;
 127out:
 128        free(tmpl_new);
 129        free(clang_opt_new);
 130        if (ret != TEST_OK)
 131                pr_debug("Failed to compile test case: '%s'\n", desc);
 132        return ret;
 133}
 134
 135int test__llvm(int subtest)
 136{
 137        int ret;
 138        void *obj_buf = NULL;
 139        size_t obj_buf_sz = 0;
 140        bool should_load_fail = false;
 141
 142        if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
 143                return TEST_FAIL;
 144
 145        ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
 146                                       subtest, false, &should_load_fail);
 147
 148        if (ret == TEST_OK && !should_load_fail) {
 149                ret = test__bpf_parsing(obj_buf, obj_buf_sz);
 150                if (ret != TEST_OK) {
 151                        pr_debug("Failed to parse test case '%s'\n",
 152                                 bpf_source_table[subtest].desc);
 153                }
 154        }
 155        free(obj_buf);
 156
 157        return ret;
 158}
 159
 160int test__llvm_subtest_get_nr(void)
 161{
 162        return __LLVM_TESTCASE_MAX;
 163}
 164
 165const char *test__llvm_subtest_get_desc(int subtest)
 166{
 167        if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
 168                return NULL;
 169
 170        return bpf_source_table[subtest].desc;
 171}
 172