Performance analysis tools for Linux

Build perf with DWARF unwinding support. Kernels older then 3.14
need to be patched to add ARM support. Kernels for tibidabo (3.0)
and imx53 (2.6) are too old and would require more patches to be
backported, so they are left without unwinding support.

RPi needed extra layer to modify the kernel recipe, and linux-imx
recipe was renamed so that it doesn't conflict with older tibidabo
kernel recipe.

Change-Id: Ic8331f8feeace67b32a5ce99ffd3fda517d595d1
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>
Reviewed-by: Ulf Hermann <ulf.hermann@theqtcompany.com>

1 files changed, 163 insertions, 0 deletions

diff --git a/meta-beagleboard-extras/recipes/linux/linux-mainline/ARM-perf-wire-up-perf_regs-and-unwind-support-for-AR.patch b/meta-beagleboard-extras/recipes/linux/linux-mainline/ARM-perf-wire-up-perf_regs-and-unwind-support-for-AR.patch
new file mode 100644
index 0000000..e3e8d21
--- /dev/null
+++ b/meta-beagleboard-extras/recipes/linux/linux-mainline/ARM-perf-wire-up-perf_regs-and-unwind-support-for-AR.patch
@@ -0,0 +1,163 @@
+From 26f603c457e0af9f5f6a0ddda66e69978c7f43b4 Mon Sep 17 00:00:00 2001
+From: Will Deacon <will.deacon@arm.com>
+Date: Thu, 26 Sep 2013 12:36:36 +0100
+Subject: [PATCH] ARM: perf: wire up perf_regs and unwind support for ARM
+
+This patch hooks in the perf_regs and libunwind code for ARM.
+
+B2Qt: Backported for 3.8 kernel
+
+Cc: Jean Pihet <jean.pihet@linaro.org>
+Signed-off-by: Will Deacon <will.deacon@arm.com>
+---
+ tools/perf/Makefile                     |  4 +++
+ tools/perf/arch/arm/Makefile            |  3 ++
+ tools/perf/arch/arm/include/perf_regs.h | 54 +++++++++++++++++++++++++++++++++
+ tools/perf/arch/arm/util/unwind.c       | 48 +++++++++++++++++++++++++++++
+ 4 files changed, 109 insertions(+)
+ create mode 100644 tools/perf/arch/arm/include/perf_regs.h
+ create mode 100644 tools/perf/arch/arm/util/unwind.c
+
+diff --git a/tools/perf/Makefile b/tools/perf/Makefile
+index fb1b1c4..316c575 100644
+--- a/tools/perf/Makefile
++++ b/tools/perf/Makefile
+@@ -84,6 +84,10 @@ ifeq ($(ARCH),x86_64)
+        NO_PERF_REGS := 0
+        LIBUNWIND_LIBS = -lunwind -lunwind-x86_64
+ endif
++ifeq ($(ARCH),arm)
++  NO_PERF_REGS := 0
++  LIBUNWIND_LIBS = -lunwind -lunwind-arm
++endif
+ 
+ # Treat warnings as errors unless directed not to
+ ifneq ($(WERROR),0)
+diff --git a/tools/perf/arch/arm/Makefile b/tools/perf/arch/arm/Makefile
+index 15130b5..fe9b61e 100644
+--- a/tools/perf/arch/arm/Makefile
++++ b/tools/perf/arch/arm/Makefile
+@@ -2,3 +2,6 @@ ifndef NO_DWARF
+ PERF_HAVE_DWARF_REGS := 1
+ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
+ endif
++ifndef NO_LIBUNWIND
++LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind.o
++endif
+diff --git a/tools/perf/arch/arm/include/perf_regs.h b/tools/perf/arch/arm/include/perf_regs.h
+new file mode 100644
+index 0000000..2a1cfde
+--- /dev/null
++++ b/tools/perf/arch/arm/include/perf_regs.h
+@@ -0,0 +1,54 @@
++#ifndef ARCH_PERF_REGS_H
++#define ARCH_PERF_REGS_H
++
++#include <stdlib.h>
++#include "../../util/types.h"
++#include <asm/perf_regs.h>
++
++#define PERF_REGS_MASK ((1ULL << PERF_REG_ARM_MAX) - 1)
++#define PERF_REG_IP    PERF_REG_ARM_PC
++#define PERF_REG_SP    PERF_REG_ARM_SP
++
++static inline const char *perf_reg_name(int id)
++{
++       switch (id) {
++       case PERF_REG_ARM_R0:
++               return "r0";
++       case PERF_REG_ARM_R1:
++               return "r1";
++       case PERF_REG_ARM_R2:
++               return "r2";
++       case PERF_REG_ARM_R3:
++               return "r3";
++       case PERF_REG_ARM_R4:
++               return "r4";
++       case PERF_REG_ARM_R5:
++               return "r5";
++       case PERF_REG_ARM_R6:
++               return "r6";
++       case PERF_REG_ARM_R7:
++               return "r7";
++       case PERF_REG_ARM_R8:
++               return "r8";
++       case PERF_REG_ARM_R9:
++               return "r9";
++       case PERF_REG_ARM_R10:
++               return "r10";
++       case PERF_REG_ARM_FP:
++               return "fp";
++       case PERF_REG_ARM_IP:
++               return "ip";
++       case PERF_REG_ARM_SP:
++               return "sp";
++       case PERF_REG_ARM_LR:
++               return "lr";
++       case PERF_REG_ARM_PC:
++               return "pc";
++       default:
++               return NULL;
++       }
++
++       return NULL;
++}
++
++#endif /* ARCH_PERF_REGS_H */
+diff --git a/tools/perf/arch/arm/util/unwind.c b/tools/perf/arch/arm/util/unwind.c
+new file mode 100644
+index 0000000..da3dc95
+--- /dev/null
++++ b/tools/perf/arch/arm/util/unwind.c
+@@ -0,0 +1,48 @@
++
++#include <errno.h>
++#include <libunwind.h>
++#include "perf_regs.h"
++#include "../../util/unwind.h"
++
++int unwind__arch_reg_id(int regnum)
++{
++       switch (regnum) {
++       case UNW_ARM_R0:
++               return PERF_REG_ARM_R0;
++       case UNW_ARM_R1:
++               return PERF_REG_ARM_R1;
++       case UNW_ARM_R2:
++               return PERF_REG_ARM_R2;
++       case UNW_ARM_R3:
++               return PERF_REG_ARM_R3;
++       case UNW_ARM_R4:
++               return PERF_REG_ARM_R4;
++       case UNW_ARM_R5:
++               return PERF_REG_ARM_R5;
++       case UNW_ARM_R6:
++               return PERF_REG_ARM_R6;
++       case UNW_ARM_R7:
++               return PERF_REG_ARM_R7;
++       case UNW_ARM_R8:
++               return PERF_REG_ARM_R8;
++       case UNW_ARM_R9:
++               return PERF_REG_ARM_R9;
++       case UNW_ARM_R10:
++               return PERF_REG_ARM_R10;
++       case UNW_ARM_R11:
++               return PERF_REG_ARM_FP;
++       case UNW_ARM_R12:
++               return PERF_REG_ARM_IP;
++       case UNW_ARM_R13:
++               return PERF_REG_ARM_SP;
++       case UNW_ARM_R14:
++               return PERF_REG_ARM_LR;
++       case UNW_ARM_R15:
++               return PERF_REG_ARM_PC;
++       default:
++               pr_err("unwind: invalid reg id %d\n", regnum);
++               return -EINVAL;
++       }
++
++       return -EINVAL;
++}
+-- 
+1.9.1
+