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[PATCH 07/12] perf tools: Add BPF_PROLOGUE config options for further patches

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If both LIBBPF and DWARF are detected, it is possible to create prologue
for eBPF programs to help them accessing kernel data. HAVE_BPF_PROLOGUE
and CONFIG_BPF_PROLOGUE is added as flags for this feature.

PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET is introduced in commit
63ab024a5b6f295ca17a293ad81b7c728f49a89a ("perf tools:
regs_query_register_offset() infrastructure"), which indicates an
architecture supports converting name of a register to its offset in
'struct pt_regs'. Without this support, BPF_PROLOGUE should be turned off.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
 tools/perf/config/Makefile | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index de89ec5..6eb9a95 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -318,6 +318,18 @@ ifndef NO_LIBELF
       CFLAGS += -DHAVE_LIBBPF_SUPPORT
       $(call detected,CONFIG_LIBBPF)
     endif
+
+    ifndef NO_DWARF
+      ifdef PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET
+        CFLAGS += -DHAVE_BPF_PROLOGUE
+        $(call detected,CONFIG_BPF_PROLOGUE)
+      else
+        msg := $(warning BPF prologue is not supported by architecture $(ARCH), missing regs_query_register_offset());
+      endif
+    else
+      msg := $(warning DWARF support is off, BPF prologue is disabled);
+    endif
+
   endif # NO_LIBBPF
 endif # NO_LIBELF
 
-- 
1.8.3.4

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[PATCH 00/12] perf tools: bpf: Improve BPF program ability Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:30 +0100
  [PATCH 08/12] perf tools: Compile dwarf-regs.c if CONFIG_BPF_PROLOGUE is on Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
  [PATCH 07/12] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
  [PATCH 09/12] perf tools: Add prologue for BPF programs for fetching arguments Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
  [PATCH 06/12] bpf tools: Load a program with different instances using preprocessor Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
  [PATCH 03/12] perf tools: Allow BPF program attach to uprobe events Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
    Re: [PATCH 03/12] perf tools: Allow BPF program attach to uprobe  events Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-13 16:40 +0100
  [PATCH 11/12] perf test: Test BPF prologue Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
  [PATCH 04/12] perf tools: Allow BPF program attach to modules Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
    Re: [PATCH 04/12] perf tools: Allow BPF program attach to modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-13 16:50 +0100
  [PATCH 10/12] perf tools: Generate prologue for BPF programs Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
  [PATCH 05/12] perf tools: Allow BPF program config probing options Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
    Re: [PATCH 05/12] perf tools: Allow BPF program config probing  options Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-13 16:50 +0100
      Re: [PATCH 05/12] perf tools: Allow BPF program config probing options "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-16 10:20 +0100
  [PATCH 01/12] perf probe: Fix memory leaking on faiulre by clearing all probe_trace_events Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
  [PATCH 02/12] perf probe: Clear probe_trace_event when add_probe_trace_event() fails Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100
    Re: [PATCH 02/12] perf probe: Clear probe_trace_event when  add_probe_trace_event() fails Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-13 17:00 +0100
  [PATCH 12/12] perf tools: Use same BPF program if arguments are identical Wang Nan <wangnan0@huawei.com> - 2015-11-13 13:40 +0100

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