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perf/core: Add perf_sample_save_raw_data() helper

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When we save the raw_data to the perf sample data, we need to update
the sample flags and the dynamic size.  To make sure this is done
consistently, add the perf_sample_save_raw_data() helper and convert
all call sites.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230118060559.615653-4-namhyung@kernel.org
This commit is contained in:
Namhyung Kim 2023-01-17 22:05:54 -08:00 committed by Ingo Molnar
parent 31046500c1
commit 0a9081cf0a
7 changed files with 39 additions and 46 deletions
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4
arch/s390/kernel/perf_cpum_cf.c
View File

@ -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, &regs);

4
arch/s390/kernel/perf_pai_crypto.c
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@ -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, &regs);

4
arch/s390/kernel/perf_pai_ext.c
View File

@ -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, &regs);

3
arch/x86/events/amd/ibs.c
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@ -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)

33
include/linux/perf_event.h
View File

@ -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 {

31
kernel/events/core.c
View File

@ -7581,30 +7581,10 @@ 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) {
@ -10120,8 +10100,7 @@ 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);

6
kernel/trace/bpf_trace.c
View File

@ -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: