Hi mpe,
On Wednesday 20 January 2016 04:16 PM, Michael Ellerman wrote:

On Mon, 2016-01-11 at 15:58 +0530, Anju T wrote:

quoted

diff --git a/tools/perf/arch/powerpc/include/perf_regs.h b/tools/perf/arch/powerpc/include/perf_regs.h
new file mode 100644
index 0000000..93080f5
--- /dev/null
+++ b/tools/perf/arch/powerpc/include/perf_regs.h

@@ -0,0 +1,64 @@
+#ifndef ARCH_PERF_REGS_H
+#define ARCH_PERF_REGS_H
+
+#include <stdlib.h>
+#include <linux/types.h>
+#include <asm/perf_regs.h>
+
+#define PERF_REGS_MASK  ((1ULL << PERF_REG_POWERPC_MAX) - 1)
+#define PERF_REGS_MAX   PERF_REG_POWERPC_MAX
+#define PERF_SAMPLE_REGS_ABI   PERF_SAMPLE_REGS_ABI_64

That looks wrong if perf is built 32-bit ?

Yes. You are right. The ABI differs for 32 bit.

quoted

+#define PERF_REG_IP     PERF_REG_POWERPC_NIP
+#define PERF_REG_SP     PERF_REG_POWERPC_GPR1
+
+static const char *reg_names[] = {
+	[PERF_REG_POWERPC_GPR0] = "gpr0",

Can you instead call them "r0" etc.

That is much more common on powerpc than "gpr0".

quoted

+	[PERF_REG_POWERPC_GPR1] = "gpr1",
+	[PERF_REG_POWERPC_GPR2] = "gpr2",
+	[PERF_REG_POWERPC_GPR3] = "gpr3",
+	[PERF_REG_POWERPC_GPR4] = "gpr4",
+	[PERF_REG_POWERPC_GPR5] = "gpr5",
+	[PERF_REG_POWERPC_GPR6] = "gpr6",
+	[PERF_REG_POWERPC_GPR7] = "gpr7",
+	[PERF_REG_POWERPC_GPR8] = "gpr8",
+	[PERF_REG_POWERPC_GPR9] = "gpr9",
+	[PERF_REG_POWERPC_GPR10] = "gpr10",
+	[PERF_REG_POWERPC_GPR11] = "gpr11",
+	[PERF_REG_POWERPC_GPR12] = "gpr12",
+	[PERF_REG_POWERPC_GPR13] = "gpr13",
+	[PERF_REG_POWERPC_GPR14] = "gpr14",
+	[PERF_REG_POWERPC_GPR15] = "gpr15",
+	[PERF_REG_POWERPC_GPR16] = "gpr16",
+	[PERF_REG_POWERPC_GPR17] = "gpr17",
+	[PERF_REG_POWERPC_GPR18] = "gpr18",
+	[PERF_REG_POWERPC_GPR19] = "gpr19",
+	[PERF_REG_POWERPC_GPR20] = "gpr20",
+	[PERF_REG_POWERPC_GPR21] = "gpr21",
+	[PERF_REG_POWERPC_GPR22] = "gpr22",
+	[PERF_REG_POWERPC_GPR23] = "gpr23",
+	[PERF_REG_POWERPC_GPR24] = "gpr24",
+	[PERF_REG_POWERPC_GPR25] = "gpr25",
+	[PERF_REG_POWERPC_GPR26] = "gpr26",
+	[PERF_REG_POWERPC_GPR27] = "gpr27",
+	[PERF_REG_POWERPC_GPR28] = "gpr28",
+	[PERF_REG_POWERPC_GPR29] = "gpr29",
+	[PERF_REG_POWERPC_GPR30] = "gpr30",
+	[PERF_REG_POWERPC_GPR31] = "gpr31",
+	[PERF_REG_POWERPC_NIP] = "nip",
+	[PERF_REG_POWERPC_MSR] = "msr",
+	[PERF_REG_POWERPC_ORIG_R3] = "orig_r3",
+	[PERF_REG_POWERPC_CTR] = "ctr",
+	[PERF_REG_POWERPC_LNK] = "link",
+	[PERF_REG_POWERPC_XER] = "xer",
+	[PERF_REG_POWERPC_CCR] = "ccr",
+	[PERF_REG_POWERPC_TRAP] = "trap",
+	[PERF_REG_POWERPC_DAR] = "dar",
+	[PERF_REG_POWERPC_DSISR] = "dsisr"
+};
+
+static inline const char *perf_reg_name(int id)
+{
+	return reg_names[id];
+}
+#endif /* ARCH_PERF_REGS_H */

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 38a0853..62a2f2d 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile

@@ -23,6 +23,11 @@ $(call detected_var,ARCH)
  
  NO_PERF_REGS := 1
  
+# Additional ARCH settings for ppc64
+ifeq ($(ARCH),powerpc)

powerpc also includes ppc, ie. 32-bit, so the comment is wrong.

I will update the comment here  in the next patch. :)

quoted

+  NO_PERF_REGS := 0
+endif
+
  # Additional ARCH settings for x86
  ifeq ($(ARCH),x86)
    $(call detected,CONFIG_X86)

Thanks and Regards

Anju