When it saves the raw_data 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_raw_data() helper and convert all call sites.
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
Cc: bpf@xxxxxxxxxxxxxxx
Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
arch/s390/kernel/perf_cpum_cf.c | 4 +---
arch/s390/kernel/perf_pai_crypto.c | 4 +---
arch/s390/kernel/perf_pai_ext.c | 4 +---
arch/x86/events/amd/ibs.c | 3 +--
include/linux/perf_event.h | 33 +++++++++++++++++++++++++-----
kernel/events/core.c | 31 +++++-----------------------
kernel/trace/bpf_trace.c | 6 ++----
7 files changed, 39 insertions(+), 46 deletions(-)
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index f043a7ff220b..aa38649c7c27 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -662,9 +662,7 @@ static int cfdiag_push_sample(struct perf_event *event,
if (event->attr.sample_type & PERF_SAMPLE_RAW) {
raw.frag.size = cpuhw->usedss;
raw.frag.data = cpuhw->stop;
- raw.size = raw.frag.size;
- data.raw = &raw;
- data.sample_flags |= PERF_SAMPLE_RAW;
+ perf_sample_save_raw_data(&data, &raw);
}
overflow = perf_event_overflow(event, &data, ®s);
diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c
index 985e243a2ed8..a7b339c4fd7c 100644
--- a/arch/s390/kernel/perf_pai_crypto.c
+++ b/arch/s390/kernel/perf_pai_crypto.c
@@ -362,9 +362,7 @@ static int paicrypt_push_sample(void)
if (event->attr.sample_type & PERF_SAMPLE_RAW) {
raw.frag.size = rawsize;
raw.frag.data = cpump->save;
- raw.size = raw.frag.size;
- data.raw = &raw;
- data.sample_flags |= PERF_SAMPLE_RAW;
+ perf_sample_save_raw_data(&data, &raw);
}
overflow = perf_event_overflow(event, &data, ®s);
diff --git a/arch/s390/kernel/perf_pai_ext.c b/arch/s390/kernel/perf_pai_ext.c
index 1138f57baae3..555597222bad 100644
--- a/arch/s390/kernel/perf_pai_ext.c
+++ b/arch/s390/kernel/perf_pai_ext.c
@@ -451,9 +451,7 @@ static int paiext_push_sample(void)
if (event->attr.sample_type & PERF_SAMPLE_RAW) {
raw.frag.size = rawsize;
raw.frag.data = cpump->save;
- raw.size = raw.frag.size;
- data.raw = &raw;
- data.sample_flags |= PERF_SAMPLE_RAW;
+ perf_sample_save_raw_data(&data, &raw);
}
overflow = perf_event_overflow(event, &data, ®s);
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 417c80bd3274..64582954b5f6 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -1110,8 +1110,7 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
.data = ibs_data.data,
},
};
- data.raw = &raw;
- data.sample_flags |= PERF_SAMPLE_RAW;
+ perf_sample_save_raw_data(&data, &raw);
}
if (perf_ibs == &perf_ibs_op)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index a9419608402b..569dfac5887f 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -95,6 +95,11 @@ struct perf_raw_record {
u32 size;
};
+static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag)
+{
+ return frag->pad < sizeof(u64);
+}
+
/*
* branch stack layout:
* nr: number of taken branches stored in entries[]
@@ -1182,6 +1187,29 @@ static inline void perf_sample_save_callchain(struct perf_sample_data *data,
data->sample_flags |= PERF_SAMPLE_CALLCHAIN;
}
+static inline void perf_sample_save_raw_data(struct perf_sample_data *data,
+ struct perf_raw_record *raw)
+{
+ struct perf_raw_frag *frag = &raw->frag;
+ u32 sum = 0;
+ int size;
+
+ do {
+ sum += frag->size;
+ if (perf_raw_frag_last(frag))
+ break;
+ frag = frag->next;
+ } while (1);
+
+ size = round_up(sum + sizeof(u32), sizeof(u64));
+ raw->size = size - sizeof(u32);
+ frag->pad = raw->size - sum;
+
+ data->raw = raw;
+ data->dyn_size += size;
+ data->sample_flags |= PERF_SAMPLE_RAW;
+}
+
/*
* Clear all bitfields in the perf_branch_entry.
* The to and from fields are not cleared because they are
@@ -1690,11 +1718,6 @@ extern void perf_restore_debug_store(void);
static inline void perf_restore_debug_store(void) { }
#endif
-static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag)
-{
- return frag->pad < sizeof(u64);
-}
-
#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
struct perf_pmu_events_attr {
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 0fba98b9cd65..133894ae5e30 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7588,30 +7588,10 @@ void perf_prepare_sample(struct perf_event_header *header,
if (filtered_sample_type & PERF_SAMPLE_CALLCHAIN)
perf_sample_save_callchain(data, event, regs);
- if (sample_type & PERF_SAMPLE_RAW) {
- struct perf_raw_record *raw = data->raw;
- int size;
-
- if (raw && (data->sample_flags & PERF_SAMPLE_RAW)) {
- struct perf_raw_frag *frag = &raw->frag;
- u32 sum = 0;
-
- do {
- sum += frag->size;
- if (perf_raw_frag_last(frag))
- break;
- frag = frag->next;
- } while (1);
-
- size = round_up(sum + sizeof(u32), sizeof(u64));
- raw->size = size - sizeof(u32);
- frag->pad = raw->size - sum;
- } else {
- size = sizeof(u64);
- data->raw = NULL;
- }
-
- data->dyn_size += size;
+ if (filtered_sample_type & PERF_SAMPLE_RAW) {
+ data->raw = NULL;
+ data->dyn_size += sizeof(u64);
+ data->sample_flags |= PERF_SAMPLE_RAW;
}
if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
@@ -10127,8 +10107,7 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
};
perf_sample_data_init(&data, 0, 0);
- data.raw = &raw;
- data.sample_flags |= PERF_SAMPLE_RAW;
+ perf_sample_save_raw_data(&data, &raw);
perf_trace_buf_update(record, event_type);
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 3bbd3f0c810c..ad37608afc35 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -687,8 +687,7 @@ BPF_CALL_5(bpf_perf_event_output, struct pt_regs *, regs, struct bpf_map *, map,
}
perf_sample_data_init(sd, 0, 0);
- sd->raw = &raw;
- sd->sample_flags |= PERF_SAMPLE_RAW;
+ perf_sample_save_raw_data(sd, &raw);
err = __bpf_perf_event_output(regs, map, flags, sd);
@@ -746,8 +745,7 @@ u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
perf_fetch_caller_regs(regs);
perf_sample_data_init(sd, 0, 0);
- sd->raw = &raw;
- sd->sample_flags |= PERF_SAMPLE_RAW;
+ perf_sample_save_raw_data(sd, &raw);
ret = __bpf_perf_event_output(regs, map, flags, sd);
out:
--
2.39.0.314.g84b9a713c41-goog
