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[PATCH 22/31] 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_GET_REG_OFFSET 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@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/n/1436445342-1402-33-git-send-email-wangnan0@huawei.com
---
 tools/perf/config/Makefile           | 12 ++++++++++++
 tools/perf/util/include/dwarf-regs.h |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 38a4144..d46765b7 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -314,6 +314,18 @@ ifndef NO_LIBELF
       CFLAGS += -DHAVE_LIBBPF_SUPPORT
       $(call detected,CONFIG_LIBBPF)
     endif
+
+    ifndef NO_DWARF
+      ifneq ($(origin PERF_HAVE_ARCH_GET_REG_INFO), undefined)
+        CFLAGS += -DHAVE_BPF_PROLOGUE
+        $(call detected,CONFIG_BPF_PROLOGUE)
+      else
+        msg := $(warning BPF prologue is not supported by architecture $(ARCH));
+      endif
+    else
+      msg := $(warning DWARF support is off, BPF prologue is disabled);
+    endif
+
   endif # NO_LIBBPF
 endif # NO_LIBELF
 
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index 8f14965..3dda083 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -5,4 +5,11 @@
 const char *get_arch_regstr(unsigned int n);
 #endif
 
+#ifdef HAVE_BPF_PROLOGUE
+/*
+ * Arch should support fetching the offset of a register in pt_regs
+ * by its name.
+ */
+int arch_get_reg_info(const char *name, int *offset);
+#endif
 #endif
-- 
2.1.0

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[PATCH 22/31] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan <wangnan0@huawei.com> - 2015-08-29 06:30 +0200
  Re: [PATCH 22/31] perf tools: Add BPF_PROLOGUE config options for  further patches Arnaldo Carvalho de Melo <acme@redhat.com> - 2015-08-31 22:40 +0200
  [PATCH 22/31] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan <wangnan0@huawei.com> - 2015-09-01 09:10 +0200
    [PATCH 23/31] perf tools: Introduce regs_query_register_offset() for x86 Wang Nan <wangnan0@huawei.com> - 2015-09-01 09:10 +0200
      RE: [PATCH 23/31] perf tools: Introduce  regs_query_register_offset() for x86 平松雅巳 / HIRAMATU，MASAMI   <masami.hiramatsu.pt@hitachi.com> - 2015-09-01 13:50 +0200
        Re: [PATCH 23/31] perf tools: Introduce regs_query_register_offset()  for x86 "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-01 16:00 +0200
          Re: [PATCH 23/31] perf tools: Introduce regs_query_register_offset()  for x86 Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-01 17:00 +0200
        Re: [PATCH 23/31] perf tools: Introduce regs_query_register_offset()  for x86 Arnaldo Carvalho de Melo <acme@redhat.com> - 2015-09-01 16:20 +0200
          RE: [PATCH 23/31] perf tools: Introduce  regs_query_register_offset() for x86 平松雅巳 / HIRAMATU，MASAMI   <masami.hiramatsu.pt@hitachi.com> - 2015-09-01 18:00 +0200
            Re: [PATCH 23/31] perf tools: Introduce regs_query_register_offset()  for x86 "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-06 08:10 +0200
              [PATCH] perf test: Enforce LLVM test, add kbuild test Wang Nan <wangnan0@huawei.com> - 2015-09-06 08:10 +0200
    Re: [PATCH 22/31] perf tools: Add BPF_PROLOGUE config options for  further patches Namhyung Kim <namhyung@kernel.org> - 2015-09-02 16:20 +0200

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