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perf arm_spe: Set HITM flag

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Since FEAT_SPEv1p4, Arm SPE provides two extra events: "Cache data
modified" and "Data snooped".

Set the snoop mode as:

- If both the "Cache data modified" event and the "Data snooped" event
  are set, which indicates a load operation that snooped from a outside
  cache and hit a modified copy, set the HITM flag to inspect false
  sharing.

- If the snooped event bit is not set, and the snooped event has been
  supported by the hardware, set as NONE mode (no snoop operation).

- If the snooped event bit is not set, and the event is not supported or
  absent the events info in the meta data, set as NA mode (not
  available).

Don't set any mode for only "Cache data modified" event, as it hits a
local modified copy.

Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Leo Yan 2025-09-12 16:42:18 +01:00 committed by Arnaldo Carvalho de Melo
parent 04abd5c065
commit d510568970
2 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/util/arm-spe-decoder/arm-spe-decoder.h
View File

@ -28,6 +28,8 @@
#define ARM_SPE_L2D_ACCESS BIT(EV_L2D_ACCESS)
#define ARM_SPE_L2D_MISS BIT(EV_L2D_MISS)
#define ARM_SPE_RECENTLY_FETCHED BIT(EV_RECENTLY_FETCHED)
#define ARM_SPE_DATA_SNOOPED BIT(EV_DATA_SNOOPED)
#define ARM_SPE_HITM BIT(EV_CACHE_DATA_MODIFIED)
enum arm_spe_op_type {
/* First level operation type */

26
tools/perf/util/arm-spe.c
View File

@ -894,9 +894,12 @@ static void arm_spe__synth_st_memory_level(const struct arm_spe_record *record,
}
}
static void arm_spe__synth_memory_level(const struct arm_spe_record *record,
static void arm_spe__synth_memory_level(struct arm_spe_queue *speq,
const struct arm_spe_record *record,
union perf_mem_data_src *data_src)
{
struct arm_spe *spe = speq->spe;
if (data_src->mem_op == PERF_MEM_OP_LOAD)
arm_spe__synth_ld_memory_level(record, data_src);
if (data_src->mem_op == PERF_MEM_OP_STORE)
@ -907,6 +910,25 @@ static void arm_spe__synth_memory_level(const struct arm_spe_record *record,
data_src->mem_lvl_num = PERF_MEM_LVLNUM_NA;
}
if (record->type & ARM_SPE_DATA_SNOOPED) {
if (record->type & ARM_SPE_HITM)
data_src->mem_snoop = PERF_MEM_SNOOP_HITM;
else
data_src->mem_snoop = PERF_MEM_SNOOP_HIT;
} else {
u64 *metadata = arm_spe__get_metadata_by_cpu(spe, speq->cpu);
/*
* Set NA ("Not available") mode if no meta data or the
* SNOOPED event is not supported.
*/
if (!metadata ||
!(metadata[ARM_SPE_CAP_EVENT_FILTER] & ARM_SPE_DATA_SNOOPED))
data_src->mem_snoop = PERF_MEM_SNOOP_NA;
else
data_src->mem_snoop = PERF_MEM_SNOOP_NONE;
}
if (record->type & ARM_SPE_REMOTE_ACCESS)
data_src->mem_remote = PERF_MEM_REMOTE_REMOTE;
}
@ -963,7 +985,7 @@ arm_spe__synth_data_source(struct arm_spe_queue *speq,
return data_src;
if (!arm_spe__synth_ds(speq, record, &data_src))
arm_spe__synth_memory_level(record, &data_src);
arm_spe__synth_memory_level(speq, record, &data_src);
if (record->type & (ARM_SPE_TLB_ACCESS | ARM_SPE_TLB_MISS)) {
data_src.mem_dtlb = PERF_MEM_TLB_WK;