[PATCH 06/37] perf bpf: Add BPF_PROLOGUE config options for further patches

[Arnaldo Carvalho de Melo]

From: Wang Nan 

If both LIBBPF and DWARF are detected, it is possible to create prologue
for eBPF programs to help them access kernel data. HAVE_BPF_PROLOGUE and
CONFIG_BPF_PROLOGUE are 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 that 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 
Cc: Alexei Starovoitov 
Cc: Masami Hiramatsu 
Cc: Zefan Li 
Cc: pi3or...@163.com
Link: 
http://lkml.kernel.org/r/1447675815-166222-9-git-send-email-wangn...@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo 
---
 tools/perf/config/Makefile | 12 
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index de89ec574361..6eb9a956a408 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
 
-- 
2.1.0

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[PATCH 06/37] perf bpf: Add BPF_PROLOGUE config options for further patches

[Arnaldo Carvalho de Melo]

From: Wang Nan 

If both LIBBPF and DWARF are detected, it is possible to create prologue
for eBPF programs to help them access kernel data. HAVE_BPF_PROLOGUE and
CONFIG_BPF_PROLOGUE are 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 that 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 
Cc: Alexei Starovoitov 
Cc: Masami Hiramatsu 
Cc: Zefan Li 
Cc: pi3or...@163.com
Link: 
http://lkml.kernel.org/r/1447675815-166222-9-git-send-email-wangn...@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo 
---
 tools/perf/config/Makefile | 12 
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index de89ec574361..6eb9a956a408 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
 
-- 
2.1.0

--
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