Hi Timothy,
On Thu, Apr 21, 2022 at 05:52:04PM +0100, Timothy Hayes wrote:
> This patch corrects a bug whereby SPE collection is invoked with
> pa_enable=1 but synthesized events fail to show physical addresses.
>
> Signed-off-by: Timothy Hayes <timothy.hayes@xxxxxxx>
> ---
> tools/perf/arch/arm64/util/arm-spe.c | 10 ++++++++++
> tools/perf/util/arm-spe.c | 3 ++-
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c
> index af4d63af8072..e8b577d33e53 100644
> --- a/tools/perf/arch/arm64/util/arm-spe.c
> +++ b/tools/perf/arch/arm64/util/arm-spe.c
> @@ -148,6 +148,7 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
> bool privileged = perf_event_paranoid_check(-1);
> struct evsel *tracking_evsel;
> int err;
> + u64 bit;
>
> sper->evlist = evlist;
>
> @@ -245,6 +246,15 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
> */
> evsel__set_sample_bit(arm_spe_evsel, DATA_SRC);
>
> + /*
> + * The PHYS_ADDR flag does not affect the driver behaviour, it is used to
> + * inform that the resulting output's SPE samples contain physical addresses
> + * where applicable.
> + */
> + bit = perf_pmu__format_bits(&arm_spe_pmu->format, "pa_enable");
> + if (arm_spe_evsel->core.attr.config & bit)
> + evsel__set_sample_bit(arm_spe_evsel, PHYS_ADDR);
> +
> /* Add dummy event to keep tracking */
> err = parse_events(evlist, "dummy:u", NULL);
> if (err)
> diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
> index 151cc38a171c..1a80151baed9 100644
> --- a/tools/perf/util/arm-spe.c
> +++ b/tools/perf/util/arm-spe.c
> @@ -1033,7 +1033,8 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
> memset(&attr, 0, sizeof(struct perf_event_attr));
> attr.size = sizeof(struct perf_event_attr);
> attr.type = PERF_TYPE_HARDWARE;
> - attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
> + attr.sample_type = evsel->core.attr.sample_type &
> + (PERF_SAMPLE_MASK | PERF_SAMPLE_PHYS_ADDR);
I verified this patch and I can confirm the physical address can be
dumped successfully.
I have a more general question, seems to me, we need to change the
macro PERF_SAMPLE_MASK in the file util/event.h as below, so
here doesn't need to 'or' the flag PERF_SAMPLE_PHYS_ADDR anymore.
@Arnaldo, @Jiri, could you confirm if this is the right way to move
forward? I am not sure why PERF_SAMPLE_MASK doesn't contain the bit
PERF_SAMPLE_PHYS_ADDR in current code.
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index cdd72e05fd28..c905ac32ebad 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -39,7 +39,7 @@ struct perf_event_attr;
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID | \
PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD | \
- PERF_SAMPLE_IDENTIFIER)
+ PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_PHYS_ADDR)
Thanks,
Leo
> attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
> PERF_SAMPLE_PERIOD | PERF_SAMPLE_DATA_SRC |
> PERF_SAMPLE_WEIGHT | PERF_SAMPLE_ADDR;
> --
> 2.25.1
>
