[PATCH 4/8] perf/core: Add perf_sample_save_brstack() helper
From: Namhyung Kim
Date: Wed Jan 18 2023 - 01:22:32 EST
When it saves the branch stack to the perf sample data, it needs to
update the sample flags and the dynamic size. To make sure this,
add the perf_sample_save_brstack() helper and convert all call sites.
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Tested-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
arch/powerpc/perf/core-book3s.c | 3 +-
arch/x86/events/amd/core.c | 6 +--
arch/x86/events/intel/core.c | 6 +--
arch/x86/events/intel/ds.c | 9 ++---
include/linux/perf_event.h | 66 ++++++++++++++++++++-------------
kernel/events/core.c | 16 +++-----
6 files changed, 53 insertions(+), 53 deletions(-)
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index bf318dd9b709..8c1f7def596e 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -2313,8 +2313,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val,
struct cpu_hw_events *cpuhw;
cpuhw = this_cpu_ptr(&cpu_hw_events);
power_pmu_bhrb_read(event, cpuhw);
- data.br_stack = &cpuhw->bhrb_stack;
- data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
+ perf_sample_save_brstack(&data, event, &cpuhw->bhrb_stack);
}
if (event->attr.sample_type & PERF_SAMPLE_DATA_SRC &&
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index d6f3703e4119..463f3eb8bbd7 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -928,10 +928,8 @@ static int amd_pmu_v2_handle_irq(struct pt_regs *regs)
if (!x86_perf_event_set_period(event))
continue;
- if (has_branch_stack(event)) {
- data.br_stack = &cpuc->lbr_stack;
- data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
- }
+ if (has_branch_stack(event))
+ perf_sample_save_brstack(&data, event, &cpuc->lbr_stack);
if (perf_event_overflow(event, &data, regs))
x86_pmu_stop(event, 0);
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 29d2d0411caf..14f0a746257d 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3036,10 +3036,8 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
perf_sample_data_init(&data, 0, event->hw.last_period);
- if (has_branch_stack(event)) {
- data.br_stack = &cpuc->lbr_stack;
- data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
- }
+ if (has_branch_stack(event))
+ perf_sample_save_brstack(&data, event, &cpuc->lbr_stack);
if (perf_event_overflow(event, &data, regs))
x86_pmu_stop(event, 0);
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index 158cf845fc80..07c8a2cdc3ee 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1720,10 +1720,8 @@ static void setup_pebs_fixed_sample_data(struct perf_event *event,
data->sample_flags |= PERF_SAMPLE_TIME;
}
- if (has_branch_stack(event)) {
- data->br_stack = &cpuc->lbr_stack;
- data->sample_flags |= PERF_SAMPLE_BRANCH_STACK;
- }
+ if (has_branch_stack(event))
+ perf_sample_save_brstack(data, event, &cpuc->lbr_stack);
}
static void adaptive_pebs_save_regs(struct pt_regs *regs,
@@ -1883,8 +1881,7 @@ static void setup_pebs_adaptive_sample_data(struct perf_event *event,
if (has_branch_stack(event)) {
intel_pmu_store_pebs_lbrs(lbr);
- data->br_stack = &cpuc->lbr_stack;
- data->sample_flags |= PERF_SAMPLE_BRANCH_STACK;
+ perf_sample_save_brstack(data, event, &cpuc->lbr_stack);
}
}
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 569dfac5887f..7db0e9cc2682 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1102,6 +1102,31 @@ extern u64 perf_event_read_value(struct perf_event *event,
extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs);
+static inline bool branch_sample_no_flags(const struct perf_event *event)
+{
+ return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_FLAGS;
+}
+
+static inline bool branch_sample_no_cycles(const struct perf_event *event)
+{
+ return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_CYCLES;
+}
+
+static inline bool branch_sample_type(const struct perf_event *event)
+{
+ return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_TYPE_SAVE;
+}
+
+static inline bool branch_sample_hw_index(const struct perf_event *event)
+{
+ return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX;
+}
+
+static inline bool branch_sample_priv(const struct perf_event *event)
+{
+ return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_PRIV_SAVE;
+}
+
struct perf_sample_data {
/*
@@ -1210,6 +1235,21 @@ static inline void perf_sample_save_raw_data(struct perf_sample_data *data,
data->sample_flags |= PERF_SAMPLE_RAW;
}
+static inline void perf_sample_save_brstack(struct perf_sample_data *data,
+ struct perf_event *event,
+ struct perf_branch_stack *brs)
+{
+ int size = sizeof(u64); /* nr */
+
+ if (branch_sample_hw_index(event))
+ size += sizeof(u64);
+ size += brs->nr * sizeof(struct perf_branch_entry);
+
+ data->br_stack = brs;
+ data->dyn_size += size;
+ data->sample_flags |= PERF_SAMPLE_BRANCH_STACK;
+}
+
/*
* Clear all bitfields in the perf_branch_entry.
* The to and from fields are not cleared because they are
@@ -1827,30 +1867,4 @@ static inline void perf_lopwr_cb(bool mode)
}
#endif
-#ifdef CONFIG_PERF_EVENTS
-static inline bool branch_sample_no_flags(const struct perf_event *event)
-{
- return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_FLAGS;
-}
-
-static inline bool branch_sample_no_cycles(const struct perf_event *event)
-{
- return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_CYCLES;
-}
-
-static inline bool branch_sample_type(const struct perf_event *event)
-{
- return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_TYPE_SAVE;
-}
-
-static inline bool branch_sample_hw_index(const struct perf_event *event)
-{
- return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX;
-}
-
-static inline bool branch_sample_priv(const struct perf_event *event)
-{
- return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_PRIV_SAVE;
-}
-#endif /* CONFIG_PERF_EVENTS */
#endif /* _LINUX_PERF_EVENT_H */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 133894ae5e30..0218b6ffaf36 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7317,7 +7317,7 @@ void perf_output_sample(struct perf_output_handle *handle,
}
if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
- if (data->sample_flags & PERF_SAMPLE_BRANCH_STACK) {
+ if (data->br_stack) {
size_t size;
size = data->br_stack->nr
@@ -7594,16 +7594,10 @@ void perf_prepare_sample(struct perf_event_header *header,
data->sample_flags |= PERF_SAMPLE_RAW;
}
- if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
- int size = sizeof(u64); /* nr */
- if (data->sample_flags & PERF_SAMPLE_BRANCH_STACK) {
- if (branch_sample_hw_index(event))
- size += sizeof(u64);
-
- size += data->br_stack->nr
- * sizeof(struct perf_branch_entry);
- }
- data->dyn_size += size;
+ if (filtered_sample_type & PERF_SAMPLE_BRANCH_STACK) {
+ data->br_stack = NULL;
+ data->dyn_size += sizeof(u64);
+ data->sample_flags |= PERF_SAMPLE_BRANCH_STACK;
}
if (sample_type & (PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER))
--
2.39.0.314.g84b9a713c41-goog