Integrate patch to add MIPS support to perf tools
Taken from
https://www.linux-mips.org/archives/linux-mips/2016-04/msg00004.html
Minor tweaks were applied to match our current kernel version.
Change-Id: Iebf3355f4763ac9d664fe316ebf356ec9ab89dbe
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 919c678..e761ccc 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -11,6 +11,8 @@
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_PERF_EVENTS
+ select HAVE_PERF_REGS
+ select HAVE_PERF_USER_STACK_DUMP
select PERF_USE_VMALLOC
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP_FILTER
diff --git a/arch/mips/include/uapi/asm/perf_regs.h b/arch/mips/include/uapi/asm/perf_regs.h
new file mode 100644
index 0000000..412d6e1
--- /dev/null
+++ b/arch/mips/include/uapi/asm/perf_regs.h
@@ -0,0 +1,41 @@
+#ifndef _ASM_MIPS_PERF_REGS_H
+#define _ASM_MIPS_PERF_REGS_H
+
+enum perf_event_mips_regs {
+ PERF_REG_MIPS_PC,
+ PERF_REG_MIPS_R1,
+ PERF_REG_MIPS_R2,
+ PERF_REG_MIPS_R3,
+ PERF_REG_MIPS_R4,
+ PERF_REG_MIPS_R5,
+ PERF_REG_MIPS_R6,
+ PERF_REG_MIPS_R7,
+ PERF_REG_MIPS_R8,
+ PERF_REG_MIPS_R9,
+ PERF_REG_MIPS_R10,
+ PERF_REG_MIPS_R11,
+ PERF_REG_MIPS_R12,
+ PERF_REG_MIPS_R13,
+ PERF_REG_MIPS_R14,
+ PERF_REG_MIPS_R15,
+ PERF_REG_MIPS_R16,
+ PERF_REG_MIPS_R17,
+ PERF_REG_MIPS_R18,
+ PERF_REG_MIPS_R19,
+ PERF_REG_MIPS_R20,
+ PERF_REG_MIPS_R21,
+ PERF_REG_MIPS_R22,
+ PERF_REG_MIPS_R23,
+ PERF_REG_MIPS_R24,
+ PERF_REG_MIPS_R25,
+ /*
+ * 26 and 27 are k0 and k1, they are always clobbered thus not
+ * stored.
+ */
+ PERF_REG_MIPS_R28,
+ PERF_REG_MIPS_R29,
+ PERF_REG_MIPS_R30,
+ PERF_REG_MIPS_R31,
+ PERF_REG_MIPS_MAX = PERF_REG_MIPS_R31 + 1,
+};
+#endif /* _ASM_MIPS_PERF_REGS_H */
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 68e2b7d..a1b7166 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -96,7 +96,7 @@
obj-$(CONFIG_HAVE_STD_PC_SERIAL_PORT) += 8250-platform.o
-obj-$(CONFIG_PERF_EVENTS) += perf_event.o
+obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o
obj-$(CONFIG_HW_PERF_EVENTS) += perf_event_mipsxx.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
diff --git a/arch/mips/kernel/perf_regs.c b/arch/mips/kernel/perf_regs.c
new file mode 100644
index 0000000..b5eea4b
--- /dev/null
+++ b/arch/mips/kernel/perf_regs.c
@@ -0,0 +1,67 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Some parts derived from x86 version of this file.
+ *
+ * Copyright (C) 2013 Cavium, Inc.
+ */
+
+#include <linux/perf_event.h>
+
+#include <asm/ptrace.h>
+
+#ifdef CONFIG_32BIT
+u64 perf_reg_abi(struct task_struct *tsk)
+{
+ return PERF_SAMPLE_REGS_ABI_32;
+}
+#else /* Must be CONFIG_64BIT */
+u64 perf_reg_abi(struct task_struct *tsk)
+{
+ if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
+ return PERF_SAMPLE_REGS_ABI_32;
+ else
+ return PERF_SAMPLE_REGS_ABI_64;
+}
+#endif /* CONFIG_32BIT */
+
+int perf_reg_validate(u64 mask)
+{
+ if (!mask)
+ return -EINVAL;
+ if (mask & ~((1ull << PERF_REG_MIPS_MAX) - 1))
+ return -EINVAL;
+ return 0;
+}
+
+u64 perf_reg_value(struct pt_regs *regs, int idx)
+{
+ long v;
+
+ switch (idx) {
+ case PERF_REG_MIPS_PC:
+ v = regs->cp0_epc;
+ break;
+ case PERF_REG_MIPS_R1 ... PERF_REG_MIPS_R25:
+ v = regs->regs[idx - PERF_REG_MIPS_R1 + 1];
+ break;
+ case PERF_REG_MIPS_R28 ... PERF_REG_MIPS_R31:
+ v = regs->regs[idx - PERF_REG_MIPS_R28 + 28];
+ break;
+
+ default:
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+
+ return (s64)v; /* Sign extend if 32-bit. */
+}
+
+void perf_get_regs_user(struct perf_regs *regs_user,
+ struct pt_regs *regs, struct pt_regs *regs_user_copy)
+{
+ regs_user->regs = task_pt_regs(current);
+ regs_user->abi = perf_reg_abi(current);
+}
diff --git a/tools/perf/arch/mips/Build b/tools/perf/arch/mips/Build
index 1bb8bf6..54afe4a 100644
--- a/tools/perf/arch/mips/Build
+++ b/tools/perf/arch/mips/Build
@@ -1 +1 @@
-# empty
+libperf-y += util/
diff --git a/tools/perf/arch/mips/Makefile b/tools/perf/arch/mips/Makefile
new file mode 100644
index 0000000..7fbca17
--- /dev/null
+++ b/tools/perf/arch/mips/Makefile
@@ -0,0 +1,3 @@
+ifndef NO_DWARF
+PERF_HAVE_DWARF_REGS := 1
+endif
diff --git a/tools/perf/arch/mips/include/perf_regs.h b/tools/perf/arch/mips/include/perf_regs.h
new file mode 100644
index 0000000..2406889
--- /dev/null
+++ b/tools/perf/arch/mips/include/perf_regs.h
@@ -0,0 +1,87 @@
+#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_MIPS_MAX) - 1)
+#define PERF_REGS_MAX PERF_REG_MIPS_MAX
+
+#define PERF_REG_IP PERF_REG_MIPS_PC
+#define PERF_REG_SP PERF_REG_MIPS_R29
+
+#define PERF_REGS_MASK ((1ULL << PERF_REG_MIPS_MAX) - 1)
+
+static inline const char *perf_reg_name(int id)
+{
+ switch (id) {
+ case PERF_REG_MIPS_PC:
+ return "PC";
+ case PERF_REG_MIPS_R1:
+ return "$1";
+ case PERF_REG_MIPS_R2:
+ return "$2";
+ case PERF_REG_MIPS_R3:
+ return "$3";
+ case PERF_REG_MIPS_R4:
+ return "$4";
+ case PERF_REG_MIPS_R5:
+ return "$5";
+ case PERF_REG_MIPS_R6:
+ return "$6";
+ case PERF_REG_MIPS_R7:
+ return "$7";
+ case PERF_REG_MIPS_R8:
+ return "$8";
+ case PERF_REG_MIPS_R9:
+ return "$9";
+ case PERF_REG_MIPS_R10:
+ return "$10";
+ case PERF_REG_MIPS_R11:
+ return "$11";
+ case PERF_REG_MIPS_R12:
+ return "$12";
+ case PERF_REG_MIPS_R13:
+ return "$13";
+ case PERF_REG_MIPS_R14:
+ return "$14";
+ case PERF_REG_MIPS_R15:
+ return "$15";
+ case PERF_REG_MIPS_R16:
+ return "$16";
+ case PERF_REG_MIPS_R17:
+ return "$17";
+ case PERF_REG_MIPS_R18:
+ return "$18";
+ case PERF_REG_MIPS_R19:
+ return "$19";
+ case PERF_REG_MIPS_R20:
+ return "$20";
+ case PERF_REG_MIPS_R21:
+ return "$21";
+ case PERF_REG_MIPS_R22:
+ return "$22";
+ case PERF_REG_MIPS_R23:
+ return "$23";
+ case PERF_REG_MIPS_R24:
+ return "$24";
+ case PERF_REG_MIPS_R25:
+ return "$25";
+
+ case PERF_REG_MIPS_R28:
+ return "$28";
+ case PERF_REG_MIPS_R29:
+ return "$29";
+ case PERF_REG_MIPS_R30:
+ return "$30";
+ case PERF_REG_MIPS_R31:
+ return "$31";
+ default:
+ break;
+ }
+ return NULL;
+}
+
+
+#endif /* ARCH_PERF_REGS_H */
diff --git a/tools/perf/arch/mips/util/Build b/tools/perf/arch/mips/util/Build
new file mode 100644
index 0000000..d22e3d0
--- /dev/null
+++ b/tools/perf/arch/mips/util/Build
@@ -0,0 +1,4 @@
+libperf-$(CONFIG_DWARF) += dwarf-regs.o
+
+libperf-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
+libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
diff --git a/tools/perf/arch/mips/util/dwarf-regs.c b/tools/perf/arch/mips/util/dwarf-regs.c
new file mode 100644
index 0000000..0afbfcc
--- /dev/null
+++ b/tools/perf/arch/mips/util/dwarf-regs.c
@@ -0,0 +1,37 @@
+/*
+ * dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
+ *
+ * Copyright (C) 2013 Cavium, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <stddef.h>
+#include <dwarf-regs.h>
+
+static const char *mips_gpr_names[32] = {
+ "$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
+ "$10", "$11", "$12", "$13", "$14", "$15", "$16", "$17", "$18", "$19",
+ "$20", "$21", "$22", "$23", "$24", "$25", "$26", "$27", "$28", "$29",
+ "$30", "$31"
+};
+
+const char *get_arch_regstr(unsigned int n)
+{
+ if (n < 32)
+ return mips_gpr_names[n];
+ if (n == 64)
+ return "hi";
+ if (n == 65)
+ return "lo";
+ return NULL;
+}
diff --git a/tools/perf/arch/mips/util/unwind-libunwind.c b/tools/perf/arch/mips/util/unwind-libunwind.c
new file mode 100644
index 0000000..7bda0fc
--- /dev/null
+++ b/tools/perf/arch/mips/util/unwind-libunwind.c
@@ -0,0 +1,21 @@
+
+#include <errno.h>
+#include <libunwind.h>
+#include "perf_regs.h"
+#include "../../util/unwind.h"
+#include "../../util/debug.h"
+
+int libunwind__arch_reg_id(int regnum)
+{
+ switch (regnum) {
+ case UNW_MIPS_R1 ... UNW_MIPS_R25:
+ return regnum - UNW_MIPS_R1 + PERF_REG_MIPS_R1;
+ case UNW_MIPS_R28 ... UNW_MIPS_R31:
+ return regnum - UNW_MIPS_R28 + PERF_REG_MIPS_R28;
+ case UNW_MIPS_PC:
+ return PERF_REG_MIPS_PC;
+ default:
+ pr_err("unwind: invalid reg id %d\n", regnum);
+ return -EINVAL;
+ }
+}
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index de89ec5..5aec034 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -51,6 +51,11 @@
$(call detected,CONFIG_PERF_REGS)
endif
+ifeq ($(ARCH),mips)
+ NO_PERF_REGS := 0
+ LIBUNWIND_LIBS = -lunwind -lunwind-mips
+endif
+
# So far there's only x86 and arm libdw unwind support merged in perf.
# Disable it on all other architectures in case libdw unwind
# support is detected in system. Add supported architectures
