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perf arm-spe: Calculate meta data size

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The metadata is designed to contain a header and per CPU information.

The arm_spe_find_cpus() function is introduced to identify how many CPUs
support ARM SPE. Based on the CPU number, calculates the metadata size.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Cc: Will Deacon <will@kernel.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Besar Wicaksono <bwicaksono@nvidia.com>
Cc: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20241003184302.190806-3-leo.yan@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Leo Yan 2024-10-03 19:42:59 +01:00 committed by Namhyung Kim
parent 0ca2c45404
commit 59715b1908
1 changed files with 36 additions and 3 deletions
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39
tools/perf/arch/arm64/util/arm-spe.c
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@ -37,11 +37,44 @@ struct arm_spe_recording {
bool *wrapped;
};
/*
* arm_spe_find_cpus() returns a new cpu map, and the caller should invoke
* perf_cpu_map__put() to release the map after use.
*/
static struct perf_cpu_map *arm_spe_find_cpus(struct evlist *evlist)
{
struct perf_cpu_map *event_cpus = evlist->core.user_requested_cpus;
struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus();
struct perf_cpu_map *intersect_cpus;
/* cpu map is not "any" CPU , we have specific CPUs to work with */
if (!perf_cpu_map__has_any_cpu(event_cpus)) {
intersect_cpus = perf_cpu_map__intersect(event_cpus, online_cpus);
perf_cpu_map__put(online_cpus);
/* Event can be "any" CPU so count all CPUs. */
} else {
intersect_cpus = online_cpus;
}
return intersect_cpus;
}
static size_t
arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused,
struct evlist *evlist __maybe_unused)
struct evlist *evlist)
{
return ARM_SPE_AUXTRACE_V1_PRIV_SIZE;
struct perf_cpu_map *cpu_map = arm_spe_find_cpus(evlist);
size_t size;
if (!cpu_map)
return 0;
size = ARM_SPE_AUXTRACE_PRIV_MAX +
ARM_SPE_CPU_PRIV_MAX * perf_cpu_map__nr(cpu_map);
size *= sizeof(u64);
perf_cpu_map__put(cpu_map);
return size;
}
static int arm_spe_info_fill(struct auxtrace_record *itr,
@ -53,7 +86,7 @@ static int arm_spe_info_fill(struct auxtrace_record *itr,
container_of(itr, struct arm_spe_recording, itr);
struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu;
if (priv_size != ARM_SPE_AUXTRACE_V1_PRIV_SIZE)
if (priv_size != arm_spe_info_priv_size(itr, session->evlist))
return -EINVAL;
if (!session->evlist->core.nr_mmaps)