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