tools/perf/tests/llvm.c

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