tools/perf/tests/llvm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <bpf/libbpf.h>
   5 #include <util/llvm-utils.h>
   6 #include <util/cache.h>
   7 #include "llvm.h"
   8 #include "tests.h"
   9 #include "debug.h"
  10 #include "util.h"
  11
  12 #ifdef HAVE_LIBBPF_SUPPORT
  13 static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
  14 {
  15         struct bpf_object *obj;
  16
  17         obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
  18         if (libbpf_get_error(obj))
  19                 return TEST_FAIL;
  20         bpf_object__close(obj);
  21         return TEST_OK;
  22 }
  23 #else
  24 static int test__bpf_parsing(void *obj_buf __maybe_unused,
  25                              size_t obj_buf_sz __maybe_unused)
  26 {
  27         pr_debug("Skip bpf parsing\n");
  28         return TEST_OK;
  29 }
  30 #endif
  31
  32 static struct {
  33         const char *source;
  34         const char *desc;
  35         bool should_load_fail;
  36 } bpf_source_table[__LLVM_TESTCASE_MAX] = {
  37         [LLVM_TESTCASE_BASE] = {
  38                 .source = test_llvm__bpf_base_prog,
  39                 .desc = "Basic BPF llvm compile",
  40         },
  41         [LLVM_TESTCASE_KBUILD] = {
  42                 .source = test_llvm__bpf_test_kbuild_prog,
  43                 .desc = "kbuild searching",
  44         },
  45         [LLVM_TESTCASE_BPF_PROLOGUE] = {
  46                 .source = test_llvm__bpf_test_prologue_prog,
  47                 .desc = "Compile source for BPF prologue generation",
  48         },
  49         [LLVM_TESTCASE_BPF_RELOCATION] = {
  50                 .source = test_llvm__bpf_test_relocation,
  51                 .desc = "Compile source for BPF relocation",
  52                 .should_load_fail = true,
  53         },
  54 };
  55
  56 int
  57 test_llvm__fetch_bpf_obj(void **p_obj_buf,
  58                          size_t *p_obj_buf_sz,
  59                          enum test_llvm__testcase idx,
  60                          bool force,
  61                          bool *should_load_fail)
  62 {
  63         const char *source;
  64         const char *desc;
  65         const char *tmpl_old, *clang_opt_old;
  66         char *tmpl_new = NULL, *clang_opt_new = NULL;
  67         int err, old_verbose, ret = TEST_FAIL;
  68
  69         if (idx >= __LLVM_TESTCASE_MAX)
  70                 return TEST_FAIL;
  71
  72         source = bpf_source_table[idx].source;
  73         desc = bpf_source_table[idx].desc;
  74         if (should_load_fail)
  75                 *should_load_fail = bpf_source_table[idx].should_load_fail;
  76
  77         /*
  78          * Skip this test if user's .perfconfig doesn't set [llvm] section
  79          * and clang is not found in $PATH, and this is not perf test -v
  80          */
  81         if (!force && (verbose <= 0 &&
  82                        !llvm_param.user_set_param &&
  83                        llvm__search_clang())) {
  84                 pr_debug("No clang and no verbosive, skip this test\n");
  85                 return TEST_SKIP;
  86         }
  87
  88         /*
  89          * llvm is verbosity when error. Suppress all error output if
  90          * not 'perf test -v'.
  91          */
  92         old_verbose = verbose;
  93         if (verbose == 0)
  94                 verbose = -1;
  95
  96         *p_obj_buf = NULL;
  97         *p_obj_buf_sz = 0;
  98
  99         if (!llvm_param.clang_bpf_cmd_template)
 100                 goto out;
 101
 102         if (!llvm_param.clang_opt)
 103                 llvm_param.clang_opt = strdup("");
 104
 105         err = asprintf(&tmpl_new, "echo '%s' | %s%s", source,
 106                        llvm_param.clang_bpf_cmd_template,
 107                        old_verbose ? "" : " 2>/dev/null");
 108         if (err < 0)
 109                 goto out;
 110         err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
 111         if (err < 0)
 112                 goto out;
 113
 114         tmpl_old = llvm_param.clang_bpf_cmd_template;
 115         llvm_param.clang_bpf_cmd_template = tmpl_new;
 116         clang_opt_old = llvm_param.clang_opt;
 117         llvm_param.clang_opt = clang_opt_new;
 118
 119         err = llvm__compile_bpf("-", p_obj_buf, p_obj_buf_sz);
 120
 121         llvm_param.clang_bpf_cmd_template = tmpl_old;
 122         llvm_param.clang_opt = clang_opt_old;
 123
 124         verbose = old_verbose;
 125         if (err)
 126                 goto out;
 127
 128         ret = TEST_OK;
 129 out:
 130         free(tmpl_new);
 131         free(clang_opt_new);
 132         if (ret != TEST_OK)
 133                 pr_debug("Failed to compile test case: '%s'\n", desc);
 134         return ret;
 135 }
 136
 137 int test__llvm(struct test *test __maybe_unused, int subtest)
 138 {
 139         int ret;
 140         void *obj_buf = NULL;
 141         size_t obj_buf_sz = 0;
 142         bool should_load_fail = false;
 143
 144         if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
 145                 return TEST_FAIL;
 146
 147         ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
 148                                        subtest, false, &should_load_fail);
 149
 150         if (ret == TEST_OK && !should_load_fail) {
 151                 ret = test__bpf_parsing(obj_buf, obj_buf_sz);
 152                 if (ret != TEST_OK) {
 153                         pr_debug("Failed to parse test case '%s'\n",
 154                                  bpf_source_table[subtest].desc);
 155                 }
 156         }
 157         free(obj_buf);
 158
 159         return ret;
 160 }
 161
 162 int test__llvm_subtest_get_nr(void)
 163 {
 164         return __LLVM_TESTCASE_MAX;
 165 }
 166
 167 const char *test__llvm_subtest_get_desc(int subtest)
 168 {
 169         if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
 170                 return NULL;
 171
 172         return bpf_source_table[subtest].desc;
 173 }