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This patch adds a kbuild testcase to check whether kernel headers can be correctly found. For example: # mv /lib/modules/4.3.0-rc5{,.bak} # perf test LLVM 38: Test LLVM searching and compiling : Skip # perf test -v LLVM ... <stdin>:11:10: fatal error: 'uapi/linux/fs.h' file not found #include <uapi/linux/fs.h> ^ 1 error generated. ERROR: unable to compile - Hint: Check error message shown above. Hint: You can also pre-compile it into .o using: clang -target bpf -O2 -c - with proper -I and -D options. Failed to compile test case: 'Test kbuild searching' test child finished with -2 Signed-off-by: Wang Nan <wangnan0@huawei.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1446817783-86722-7-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
171 lines
3.7 KiB
C
171 lines
3.7 KiB
C
#include <stdio.h>
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#include <bpf/libbpf.h>
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#include <util/llvm-utils.h>
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#include <util/cache.h>
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#include "llvm.h"
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#include "tests.h"
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#include "debug.h"
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static int perf_config_cb(const char *var, const char *val,
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void *arg __maybe_unused)
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{
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return perf_default_config(var, val, arg);
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}
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#ifdef HAVE_LIBBPF_SUPPORT
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static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
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{
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struct bpf_object *obj;
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obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
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if (IS_ERR(obj))
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return TEST_FAIL;
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bpf_object__close(obj);
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return TEST_OK;
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}
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#else
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static int test__bpf_parsing(void *obj_buf __maybe_unused,
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size_t obj_buf_sz __maybe_unused)
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{
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pr_debug("Skip bpf parsing\n");
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return TEST_OK;
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}
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#endif
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static struct {
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const char *source;
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const char *desc;
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} bpf_source_table[__LLVM_TESTCASE_MAX] = {
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[LLVM_TESTCASE_BASE] = {
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.source = test_llvm__bpf_base_prog,
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.desc = "Basic BPF llvm compiling test",
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},
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[LLVM_TESTCASE_KBUILD] = {
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.source = test_llvm__bpf_test_kbuild_prog,
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.desc = "Test kbuild searching",
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},
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};
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int
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test_llvm__fetch_bpf_obj(void **p_obj_buf,
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size_t *p_obj_buf_sz,
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enum test_llvm__testcase index,
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bool force)
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{
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const char *source;
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const char *desc;
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const char *tmpl_old, *clang_opt_old;
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char *tmpl_new = NULL, *clang_opt_new = NULL;
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int err, old_verbose, ret = TEST_FAIL;
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if (index >= __LLVM_TESTCASE_MAX)
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return TEST_FAIL;
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source = bpf_source_table[index].source;
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desc = bpf_source_table[index].desc;
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perf_config(perf_config_cb, NULL);
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/*
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* Skip this test if user's .perfconfig doesn't set [llvm] section
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* and clang is not found in $PATH, and this is not perf test -v
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*/
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if (!force && (verbose == 0 &&
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!llvm_param.user_set_param &&
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llvm__search_clang())) {
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pr_debug("No clang and no verbosive, skip this test\n");
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return TEST_SKIP;
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}
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/*
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* llvm is verbosity when error. Suppress all error output if
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* not 'perf test -v'.
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*/
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old_verbose = verbose;
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if (verbose == 0)
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verbose = -1;
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*p_obj_buf = NULL;
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*p_obj_buf_sz = 0;
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if (!llvm_param.clang_bpf_cmd_template)
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goto out;
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if (!llvm_param.clang_opt)
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llvm_param.clang_opt = strdup("");
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err = asprintf(&tmpl_new, "echo '%s' | %s%s", source,
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llvm_param.clang_bpf_cmd_template,
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old_verbose ? "" : " 2>/dev/null");
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if (err < 0)
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goto out;
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err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
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if (err < 0)
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goto out;
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tmpl_old = llvm_param.clang_bpf_cmd_template;
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llvm_param.clang_bpf_cmd_template = tmpl_new;
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clang_opt_old = llvm_param.clang_opt;
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llvm_param.clang_opt = clang_opt_new;
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err = llvm__compile_bpf("-", p_obj_buf, p_obj_buf_sz);
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llvm_param.clang_bpf_cmd_template = tmpl_old;
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llvm_param.clang_opt = clang_opt_old;
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verbose = old_verbose;
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if (err)
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goto out;
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ret = TEST_OK;
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out:
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free(tmpl_new);
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free(clang_opt_new);
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if (ret != TEST_OK)
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pr_debug("Failed to compile test case: '%s'\n", desc);
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return ret;
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}
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int test__llvm(void)
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{
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enum test_llvm__testcase i;
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for (i = 0; i < __LLVM_TESTCASE_MAX; i++) {
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int ret;
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void *obj_buf = NULL;
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size_t obj_buf_sz = 0;
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ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
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i, false);
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if (ret == TEST_OK) {
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ret = test__bpf_parsing(obj_buf, obj_buf_sz);
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if (ret != TEST_OK)
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pr_debug("Failed to parse test case '%s'\n",
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bpf_source_table[i].desc);
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}
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free(obj_buf);
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switch (ret) {
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case TEST_SKIP:
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return TEST_SKIP;
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case TEST_OK:
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break;
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default:
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/*
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* Test 0 is the basic LLVM test. If test 0
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* fail, the basic LLVM support not functional
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* so the whole test should fail. If other test
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* case fail, it can be fixed by adjusting
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* config so don't report error.
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*/
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if (i == 0)
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return TEST_FAIL;
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else
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return TEST_SKIP;
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}
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}
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return TEST_OK;
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}
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