perf llvm: Allow dump llvm output object file using llvm.dump-obj

Add a 'llvm.dump-obj' config option to enable perf dump BPF object files
compiled by LLVM.

This option is useful when using BPF objects in embedded platforms.
LLVM compiler won't be deployed in these platforms, and currently we
don't support dynamic compiling library.

Before this patch users have to explicitly issue llvm commands to
compile BPF scripts, and can't use helpers (like include path detection
and default macros) in perf. With this option, user is allowed to use
perf to compile their BPF objects then copy them into their embedded
platforms.

Committer notice:

Testing it:

  # cat ~/.perfconfig
  [llvm]
	dump-obj = true
  #
  # ls -la filter.o
  ls: cannot access filter.o: No such file or directory
  # cat filter.c
  #include <uapi/linux/bpf.h>
  #define SEC(NAME) __attribute__((section(NAME), used))

  SEC("func=hrtimer_nanosleep rqtp->tv_nsec")
  int func(void *ctx, int err, long nsec)
  {
	return nsec > 1000;
  }
  char _license[] SEC("license") = "GPL";
  int _version SEC("version") = LINUX_VERSION_CODE;
  # trace -e nanosleep --event filter.c usleep 6
  LLVM: dumping filter.o
     0.007 ( 0.007 ms): usleep/13976 nanosleep(rqtp: 0x7ffc5847f640                                        ) ...
     0.007 (         ): perf_bpf_probe:func:(ffffffff811137d0) tv_nsec=6000)
     0.070 ( 0.070 ms): usleep/13976  ... [continued]: nanosleep()) = 0
  # ls -la filter.o
  -rw-r--r--. 1 root root 776 Jun 20 17:01 filter.o
  # readelf -SW filter.o
  There are 7 section headers, starting at offset 0x148:

  Section Headers:
   [Nr] Name        Type       Address          Off    Size   ES Flg Lk Inf Al
   [ 0]             NULL       0000000000000000 000000 000000 00      0   0  0
   [ 1] .strtab     STRTAB     0000000000000000 0000e8 00005a 00      0   0  1
   [ 2] .text       PROGBITS   0000000000000000 000040 000000 00  AX  0   0  4
   [ 3] func=hrtimer_nanosleep rqtp->tv_nsec PROGBITS 0000000000000000 000040 000028 00  AX  0   0  8
   [ 4] license     PROGBITS   0000000000000000 000068 000004 00  WA  0   0  1
   [ 5] version     PROGBITS   0000000000000000 00006c 000004 00  WA  0   0  4
   [ 6] .symtab     SYMTAB     0000000000000000 000070 000078 18      1   2  8
  Key to Flags:
   W (write), A (alloc), X (execute), M (merge), S (strings)
   I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
   O (extra OS processing required) o (OS specific), p (processor specific)
   #

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1466064161-48553-2-git-send-email-wangnan0@huawei.com
[ s/dumpping/dumping/g ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
index 33071d6159bccd9c7b011d22e9550951f745faa9..878a566763c3e2c61bb9ff9debef9b3727c90a30 100644 (file)
--- a/tools/perf/util/llvm-utils.c
+++ b/tools/perf/util/llvm-utils.c
@@ -42,6 +42,8 @@ int perf_llvm_config(const char *var, const char *value)
                llvm_param.kbuild_dir = strdup(value);
        else if (!strcmp(var, "kbuild-opts"))
                llvm_param.kbuild_opts = strdup(value);
+       else if (!strcmp(var, "dump-obj"))
+               llvm_param.dump_obj = !!perf_config_bool(var, value);
        else
                return -1;
        llvm_param.user_set_param = true;
@@ -326,6 +328,42 @@ get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts)
        pr_debug("include option is set to %s\n", *kbuild_include_opts);
 }
 
+static void
+dump_obj(const char *path, void *obj_buf, size_t size)
+{
+       char *obj_path = strdup(path);
+       FILE *fp;
+       char *p;
+
+       if (!obj_path) {
+               pr_warning("WARNING: No enough memory, skip object dumping\n");
+               return;
+       }
+
+       p = strrchr(obj_path, '.');
+       if (!p || (strcmp(p, ".c") != 0)) {
+               pr_warning("WARNING: invalid llvm source path: '%s', skip object dumping\n",
+                          obj_path);
+               goto out;
+       }
+
+       p[1] = 'o';
+       fp = fopen(obj_path, "wb");
+       if (!fp) {
+               pr_warning("WARNING: failed to open '%s': %s, skip object dumping\n",
+                          obj_path, strerror(errno));
+               goto out;
+       }
+
+       pr_info("LLVM: dumping %s\n", obj_path);
+       if (fwrite(obj_buf, size, 1, fp) != 1)
+               pr_warning("WARNING: failed to write to file '%s': %s, skip object dumping\n",
+                          obj_path, strerror(errno));
+       fclose(fp);
+out:
+       free(obj_path);
+}
+
 int llvm__compile_bpf(const char *path, void **p_obj_buf,
                      size_t *p_obj_buf_sz)
 {
@@ -411,6 +449,10 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
 
        free(kbuild_dir);
        free(kbuild_include_opts);
+
+       if (llvm_param.dump_obj)
+               dump_obj(path, obj_buf, obj_buf_sz);
+
        if (!p_obj_buf)
                free(obj_buf);
        else

diff --git a/tools/perf/util/llvm-utils.h b/tools/perf/util/llvm-utils.h
index 23b9a743fe72f9f037e2527dbd42f8f18bc81b9e..9f501cef06a1c52e365ae97517e5d3d9144c4233 100644 (file)
--- a/tools/perf/util/llvm-utils.h
+++ b/tools/perf/util/llvm-utils.h
@@ -29,6 +29,11 @@ struct llvm_param {
         * compiling. Should not be used for dynamic compiling.
         */
        const char *kbuild_opts;
+       /*
+        * Default is false. If set to true, write compiling result
+        * to object file.
+        */
+       bool dump_obj;
        /*
         * Default is false. If one of the above fields is set by user
         * explicitly then user_set_llvm is set to true. This is used