[PATCH v1 3/4] perf parse-regs: Introduce a weak function arch__sample_reg_masks()

From: Leo Yan
Date: Wed Feb 14 2024 - 06:41:07 EST

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Every architecture can provide a register list for sampling. If an
architecture doesn't support register sampling, it won't define the data
structure 'sample_reg_masks'. Consequently, any code using this
structure must be protected by the macro 'HAVE_PERF_REGS_SUPPORT'.

This patch defines a weak function, arch__sample_reg_masks(), which will
be replaced by an architecture-defined function for returning the
architecture's register list. With this refactoring, the function always
exists, the condition checking for 'HAVE_PERF_REGS_SUPPORT' is not
needed anymore, so remove it.

Signed-off-by: Leo Yan <leo.yan@xxxxxxxxx>
---
tools/perf/arch/arm/util/perf_regs.c | 7 ++++++-
tools/perf/arch/arm64/util/machine.c | 2 ++
tools/perf/arch/arm64/util/perf_regs.c | 7 ++++++-
tools/perf/arch/csky/util/perf_regs.c | 7 ++++++-
tools/perf/arch/loongarch/util/perf_regs.c | 7 ++++++-
tools/perf/arch/mips/util/perf_regs.c | 7 ++++++-
tools/perf/arch/powerpc/util/perf_regs.c | 7 ++++++-
tools/perf/arch/riscv/util/perf_regs.c | 7 ++++++-
tools/perf/arch/s390/util/perf_regs.c | 7 ++++++-
tools/perf/arch/x86/util/perf_regs.c | 7 ++++++-
tools/perf/util/parse-regs-options.c | 8 ++------
tools/perf/util/perf_regs.c | 9 +++++++++
tools/perf/util/perf_regs.h | 3 +--
13 files changed, 68 insertions(+), 17 deletions(-)

diff --git a/tools/perf/arch/arm/util/perf_regs.c b/tools/perf/arch/arm/util/perf_regs.c
index 2c56e8b56ddf..f94a0210c7b7 100644
--- a/tools/perf/arch/arm/util/perf_regs.c
+++ b/tools/perf/arch/arm/util/perf_regs.c
@@ -2,7 +2,7 @@
#include "perf_regs.h"
#include "../../../util/perf_regs.h"

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG_END
};

@@ -15,3 +15,8 @@ uint64_t arch__user_reg_mask(void)
{
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/arm64/util/machine.c b/tools/perf/arch/arm64/util/machine.c
index ba1144366e85..aab1cc2bc283 100644
--- a/tools/perf/arch/arm64/util/machine.c
+++ b/tools/perf/arch/arm64/util/machine.c
@@ -12,5 +12,7 @@

void arch__add_leaf_frame_record_opts(struct record_opts *opts)
{
+ const struct sample_reg *sample_reg_masks = arch__sample_reg_masks();
+
opts->sample_user_regs |= sample_reg_masks[PERF_REG_ARM64_LR].mask;
}
diff --git a/tools/perf/arch/arm64/util/perf_regs.c b/tools/perf/arch/arm64/util/perf_regs.c
index 1b79d8eab22f..09308665e28a 100644
--- a/tools/perf/arch/arm64/util/perf_regs.c
+++ b/tools/perf/arch/arm64/util/perf_regs.c
@@ -16,7 +16,7 @@
#define HWCAP_SVE (1 << 22)
#endif

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG(x0, PERF_REG_ARM64_X0),
SMPL_REG(x1, PERF_REG_ARM64_X1),
SMPL_REG(x2, PERF_REG_ARM64_X2),
@@ -175,3 +175,8 @@ uint64_t arch__user_reg_mask(void)
}
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/csky/util/perf_regs.c b/tools/perf/arch/csky/util/perf_regs.c
index c0877c264d49..6b1665f41180 100644
--- a/tools/perf/arch/csky/util/perf_regs.c
+++ b/tools/perf/arch/csky/util/perf_regs.c
@@ -2,7 +2,7 @@
#include "perf_regs.h"
#include "../../util/perf_regs.h"

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG_END
};

@@ -15,3 +15,8 @@ uint64_t arch__user_reg_mask(void)
{
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/loongarch/util/perf_regs.c b/tools/perf/arch/loongarch/util/perf_regs.c
index 2c56e8b56ddf..f94a0210c7b7 100644
--- a/tools/perf/arch/loongarch/util/perf_regs.c
+++ b/tools/perf/arch/loongarch/util/perf_regs.c
@@ -2,7 +2,7 @@
#include "perf_regs.h"
#include "../../../util/perf_regs.h"

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG_END
};

@@ -15,3 +15,8 @@ uint64_t arch__user_reg_mask(void)
{
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/mips/util/perf_regs.c b/tools/perf/arch/mips/util/perf_regs.c
index c0877c264d49..6b1665f41180 100644
--- a/tools/perf/arch/mips/util/perf_regs.c
+++ b/tools/perf/arch/mips/util/perf_regs.c
@@ -2,7 +2,7 @@
#include "perf_regs.h"
#include "../../util/perf_regs.h"

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG_END
};

@@ -15,3 +15,8 @@ uint64_t arch__user_reg_mask(void)
{
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/powerpc/util/perf_regs.c b/tools/perf/arch/powerpc/util/perf_regs.c
index b38aa056eea0..e8e6e6fc6f17 100644
--- a/tools/perf/arch/powerpc/util/perf_regs.c
+++ b/tools/perf/arch/powerpc/util/perf_regs.c
@@ -17,7 +17,7 @@
#define PVR_POWER9 0x004E
#define PVR_POWER10 0x0080

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG(r0, PERF_REG_POWERPC_R0),
SMPL_REG(r1, PERF_REG_POWERPC_R1),
SMPL_REG(r2, PERF_REG_POWERPC_R2),
@@ -232,3 +232,8 @@ uint64_t arch__user_reg_mask(void)
{
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/riscv/util/perf_regs.c b/tools/perf/arch/riscv/util/perf_regs.c
index c0877c264d49..6b1665f41180 100644
--- a/tools/perf/arch/riscv/util/perf_regs.c
+++ b/tools/perf/arch/riscv/util/perf_regs.c
@@ -2,7 +2,7 @@
#include "perf_regs.h"
#include "../../util/perf_regs.h"

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG_END
};

@@ -15,3 +15,8 @@ uint64_t arch__user_reg_mask(void)
{
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/s390/util/perf_regs.c b/tools/perf/arch/s390/util/perf_regs.c
index c0877c264d49..6b1665f41180 100644
--- a/tools/perf/arch/s390/util/perf_regs.c
+++ b/tools/perf/arch/s390/util/perf_regs.c
@@ -2,7 +2,7 @@
#include "perf_regs.h"
#include "../../util/perf_regs.h"

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG_END
};

@@ -15,3 +15,8 @@ uint64_t arch__user_reg_mask(void)
{
return PERF_REGS_MASK;
}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
diff --git a/tools/perf/arch/x86/util/perf_regs.c b/tools/perf/arch/x86/util/perf_regs.c
index b813502a2727..12fd93f04802 100644
--- a/tools/perf/arch/x86/util/perf_regs.c
+++ b/tools/perf/arch/x86/util/perf_regs.c
@@ -13,7 +13,7 @@
#include "../../../util/pmu.h"
#include "../../../util/pmus.h"

-const struct sample_reg sample_reg_masks[] = {
+static const struct sample_reg sample_reg_masks[] = {
SMPL_REG(AX, PERF_REG_X86_AX),
SMPL_REG(BX, PERF_REG_X86_BX),
SMPL_REG(CX, PERF_REG_X86_CX),
@@ -276,6 +276,11 @@ int arch_sdt_arg_parse_op(char *old_op, char **new_op)
return SDT_ARG_VALID;
}

+const struct sample_reg *arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
+
uint64_t arch__intr_reg_mask(void)
{
struct perf_event_attr attr = {
diff --git a/tools/perf/util/parse-regs-options.c b/tools/perf/util/parse-regs-options.c
index a4a100425b3a..cda1c620968e 100644
--- a/tools/perf/util/parse-regs-options.c
+++ b/tools/perf/util/parse-regs-options.c
@@ -46,22 +46,18 @@ __parse_regs(const struct option *opt, const char *str, int unset, bool intr)

if (!strcmp(s, "?")) {
fprintf(stderr, "available registers: ");
-#ifdef HAVE_PERF_REGS_SUPPORT
- for (r = sample_reg_masks; r->name; r++) {
+ for (r = arch__sample_reg_masks(); r->name; r++) {
if (r->mask & mask)
fprintf(stderr, "%s ", r->name);
}
-#endif
fputc('\n', stderr);
/* just printing available regs */
goto error;
}
-#ifdef HAVE_PERF_REGS_SUPPORT
- for (r = sample_reg_masks; r->name; r++) {
+ for (r = arch__sample_reg_masks(); r->name; r++) {
if ((r->mask & mask) && !strcasecmp(s, r->name))
break;
}
-#endif
if (!r || !r->name) {
ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n",
s, intr ? "-I" : "--user-regs=");
diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c
index 64724eb58dd5..44b90bbf2d07 100644
--- a/tools/perf/util/perf_regs.c
+++ b/tools/perf/util/perf_regs.c
@@ -21,6 +21,15 @@ uint64_t __weak arch__user_reg_mask(void)
return 0;
}

+static const struct sample_reg sample_reg_masks[] = {
+ SMPL_REG_END
+};
+
+const struct sample_reg * __weak arch__sample_reg_masks(void)
+{
+ return sample_reg_masks;
+}
+
const char *perf_reg_name(int id, const char *arch)
{
const char *reg_name = NULL;
diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h
index 7fd0c7b4cec1..f2d0736d65cc 100644
--- a/tools/perf/util/perf_regs.h
+++ b/tools/perf/util/perf_regs.h
@@ -26,8 +26,7 @@ enum {
int arch_sdt_arg_parse_op(char *old_op, char **new_op);
uint64_t arch__intr_reg_mask(void);
uint64_t arch__user_reg_mask(void);
-
-extern const struct sample_reg sample_reg_masks[];
+const struct sample_reg *arch__sample_reg_masks(void);

const char *perf_reg_name(int id, const char *arch);
int perf_reg_value(u64 *valp, struct regs_dump *regs, int id);
--
2.34.1

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Previous message: Leo Yan: "[PATCH v1 2/4] perf parse-regs: Always build perf register functions"
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