Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 (IS_ERR(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 compiling test",
38 },
39 [LLVM_TESTCASE_KBUILD] = {
40 .source = test_llvm__bpf_test_kbuild_prog,
41 .desc = "Test kbuild searching",
42 },
43 [LLVM_TESTCASE_BPF_PROLOGUE] = {
44 .source = test_llvm__bpf_test_prologue_prog,
45 .desc = "Compile source for BPF prologue generation test",
46 },
47 [LLVM_TESTCASE_BPF_RELOCATION] = {
48 .source = test_llvm__bpf_test_relocation,
49 .desc = "Compile source for BPF relocation test",
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}