diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/events/amd/ibs.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index 371014802191..74e664266753 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -247,11 +247,33 @@ int forward_event_to_ibs(struct perf_event *event) return -ENOENT; } +/* + * Grouping of IBS events is not possible since IBS can have only + * one event active at any point in time. + */ +static int validate_group(struct perf_event *event) +{ + struct perf_event *sibling; + + if (event->group_leader == event) + return 0; + + if (event->group_leader->pmu == event->pmu) + return -EINVAL; + + for_each_sibling_event(sibling, event->group_leader) { + if (sibling->pmu == event->pmu) + return -EINVAL; + } + return 0; +} + static int perf_ibs_init(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; struct perf_ibs *perf_ibs; u64 max_cnt, config; + int ret; perf_ibs = get_ibs_pmu(event->attr.type); if (!perf_ibs) @@ -265,6 +287,10 @@ static int perf_ibs_init(struct perf_event *event) if (config & ~perf_ibs->config_mask) return -EINVAL; + ret = validate_group(event); + if (ret) + return ret; + if (hwc->sample_period) { if (config & perf_ibs->cnt_mask) /* raw max_cnt may not be set */ |