3 files changed, 34 insertions, 158 deletions

diff --git a/tools/perf/arch/powerpc/util/Build b/tools/perf/arch/powerpc/util/Build
index 6c588ecdf3bd..ed82715080f9 100644
--- a/tools/perf/arch/powerpc/util/Build
+++ b/tools/perf/arch/powerpc/util/Build
@@ -7,8 +7,7 @@ perf-util-y += sym-handling.o
 perf-util-y += evsel.o
 perf-util-y += event.o
 
-perf-util-$(CONFIG_DWARF) += dwarf-regs.o
-perf-util-$(CONFIG_DWARF) += skip-callchain-idx.o
+perf-util-$(CONFIG_LIBDW) += skip-callchain-idx.o
 
 perf-util-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
 perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
diff --git a/tools/perf/arch/powerpc/util/dwarf-regs.c b/tools/perf/arch/powerpc/util/dwarf-regs.c
deleted file mode 100644
index 104c7ae5c433..000000000000
--- a/tools/perf/arch/powerpc/util/dwarf-regs.c
+++ /dev/null
@@ -1,153 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Mapping of DWARF debug register numbers into register names.
- *
- * Copyright (C) 2010 Ian Munsie, IBM Corporation.
- */
-
-#include <stddef.h>
-#include <errno.h>
-#include <string.h>
-#include <dwarf-regs.h>
-#include <linux/ptrace.h>
-#include <linux/kernel.h>
-#include <linux/stringify.h>
-
-struct pt_regs_dwarfnum {
-	const char *name;
-	unsigned int dwarfnum;
-	unsigned int ptregs_offset;
-};
-
-#define REG_DWARFNUM_NAME(r, num)					\
-		{.name = __stringify(%)__stringify(r), .dwarfnum = num,			\
-		.ptregs_offset = offsetof(struct pt_regs, r)}
-#define GPR_DWARFNUM_NAME(num)						\
-		{.name = __stringify(%gpr##num), .dwarfnum = num,		\
-		.ptregs_offset = offsetof(struct pt_regs, gpr[num])}
-#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
-
-/*
- * Reference:
- * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
- */
-static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
-	GPR_DWARFNUM_NAME(0),
-	GPR_DWARFNUM_NAME(1),
-	GPR_DWARFNUM_NAME(2),
-	GPR_DWARFNUM_NAME(3),
-	GPR_DWARFNUM_NAME(4),
-	GPR_DWARFNUM_NAME(5),
-	GPR_DWARFNUM_NAME(6),
-	GPR_DWARFNUM_NAME(7),
-	GPR_DWARFNUM_NAME(8),
-	GPR_DWARFNUM_NAME(9),
-	GPR_DWARFNUM_NAME(10),
-	GPR_DWARFNUM_NAME(11),
-	GPR_DWARFNUM_NAME(12),
-	GPR_DWARFNUM_NAME(13),
-	GPR_DWARFNUM_NAME(14),
-	GPR_DWARFNUM_NAME(15),
-	GPR_DWARFNUM_NAME(16),
-	GPR_DWARFNUM_NAME(17),
-	GPR_DWARFNUM_NAME(18),
-	GPR_DWARFNUM_NAME(19),
-	GPR_DWARFNUM_NAME(20),
-	GPR_DWARFNUM_NAME(21),
-	GPR_DWARFNUM_NAME(22),
-	GPR_DWARFNUM_NAME(23),
-	GPR_DWARFNUM_NAME(24),
-	GPR_DWARFNUM_NAME(25),
-	GPR_DWARFNUM_NAME(26),
-	GPR_DWARFNUM_NAME(27),
-	GPR_DWARFNUM_NAME(28),
-	GPR_DWARFNUM_NAME(29),
-	GPR_DWARFNUM_NAME(30),
-	GPR_DWARFNUM_NAME(31),
-	REG_DWARFNUM_NAME(msr,   66),
-	REG_DWARFNUM_NAME(ctr,   109),
-	REG_DWARFNUM_NAME(link,  108),
-	REG_DWARFNUM_NAME(xer,   101),
-	REG_DWARFNUM_NAME(dar,   119),
-	REG_DWARFNUM_NAME(dsisr, 118),
-	REG_DWARFNUM_END,
-};
-
-/**
- * get_arch_regstr() - lookup register name from it's DWARF register number
- * @n:	the DWARF register number
- *
- * get_arch_regstr() returns the name of the register in struct
- * regdwarfnum_table from it's DWARF register number. If the register is not
- * found in the table, this returns NULL;
- */
-const char *get_arch_regstr(unsigned int n)
-{
-	const struct pt_regs_dwarfnum *roff;
-	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
-		if (roff->dwarfnum == n)
-			return roff->name;
-	return NULL;
-}
-
-int regs_query_register_offset(const char *name)
-{
-	const struct pt_regs_dwarfnum *roff;
-	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
-		if (!strcmp(roff->name, name))
-			return roff->ptregs_offset;
-	return -EINVAL;
-}
-
-#define PPC_OP(op)	(((op) >> 26) & 0x3F)
-#define PPC_RA(a)	(((a) >> 16) & 0x1f)
-#define PPC_RT(t)	(((t) >> 21) & 0x1f)
-#define PPC_RB(b)	(((b) >> 11) & 0x1f)
-#define PPC_D(D)	((D) & 0xfffe)
-#define PPC_DS(DS)	((DS) & 0xfffc)
-#define OP_LD	58
-#define OP_STD	62
-
-static int get_source_reg(u32 raw_insn)
-{
-	return PPC_RA(raw_insn);
-}
-
-static int get_target_reg(u32 raw_insn)
-{
-	return PPC_RT(raw_insn);
-}
-
-static int get_offset_opcode(u32 raw_insn)
-{
-	int opcode = PPC_OP(raw_insn);
-
-	/* DS- form */
-	if ((opcode == OP_LD) || (opcode == OP_STD))
-		return PPC_DS(raw_insn);
-	else
-		return PPC_D(raw_insn);
-}
-
-/*
- * Fills the required fields for op_loc depending on if it
- * is a source or target.
- * D form: ins RT,D(RA) -> src_reg1 = RA, offset = D, dst_reg1 = RT
- * DS form: ins RT,DS(RA) -> src_reg1 = RA, offset = DS, dst_reg1 = RT
- * X form: ins RT,RA,RB -> src_reg1 = RA, src_reg2 = RB, dst_reg1 = RT
- */
-void get_powerpc_regs(u32 raw_insn, int is_source,
-		struct annotated_op_loc *op_loc)
-{
-	if (is_source)
-		op_loc->reg1 = get_source_reg(raw_insn);
-	else
-		op_loc->reg1 = get_target_reg(raw_insn);
-
-	if (op_loc->multi_regs)
-		op_loc->reg2 = PPC_RB(raw_insn);
-
-	/* TODO: Implement offset handling for X Form */
-	if ((op_loc->mem_ref) && (PPC_OP(raw_insn) != 31))
-		op_loc->offset = get_offset_opcode(raw_insn);
-}
diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c
index 6b00efd53638..c7df534dbf8f 100644
--- a/tools/perf/arch/powerpc/util/header.c
+++ b/tools/perf/arch/powerpc/util/header.c
@@ -10,9 +10,21 @@
 #include "utils_header.h"
 #include "metricgroup.h"
 #include <api/fs/fs.h>
+#include <sys/auxv.h>
+
+static bool is_compat_mode(void)
+{
+	u64 base_platform = getauxval(AT_BASE_PLATFORM);
+	u64 platform = getauxval(AT_PLATFORM);
+
+	if (!strcmp((char *)platform, (char *)base_platform))
+		return false;
+
+	return true;
+}
 
 int
-get_cpuid(char *buffer, size_t sz)
+get_cpuid(char *buffer, size_t sz, struct perf_cpu cpu __maybe_unused)
 {
 	unsigned long pvr;
 	int nb;
@@ -30,11 +42,29 @@ get_cpuid(char *buffer, size_t sz)
 }
 
 char *
-get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
+get_cpuid_str(struct perf_cpu cpu __maybe_unused)
 {
 	char *bufp;
+	unsigned long pvr;
+
+	/*
+	 * IBM Power System supports compatible mode. That is
+	 * Nth generation platform can support previous generation
+	 * OS in a mode called compatibile mode. For ex. LPAR can be
+	 * booted in a Power9 mode when the system is a Power10.
+	 *
+	 * In the compatible mode, care must be taken when generating
+	 * PVR value. When read, PVR will be of the AT_BASE_PLATFORM
+	 * To support generic events, return 0x00ffffff as pvr when
+	 * booted in compat mode. Based on this pvr value, json will
+	 * pick events from pmu-events/arch/powerpc/compat
+	 */
+	if (!is_compat_mode())
+		pvr = mfspr(SPRN_PVR);
+	else
+		pvr = 0x00ffffff;
 
-	if (asprintf(&bufp, "0x%.8lx", mfspr(SPRN_PVR)) < 0)
+	if (asprintf(&bufp, "0x%.8lx", pvr) < 0)
 		bufp = NULL;
 
 	return bufp;