diff options
| -rw-r--r-- | arch/x86/events/amd/uncore.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c index ff1d09cc07ad..2fe623923034 100644 --- a/arch/x86/events/amd/uncore.c +++ b/arch/x86/events/amd/uncore.c @@ -96,7 +96,16 @@ static void amd_uncore_read(struct perf_event *event) */ prev = local64_read(&hwc->prev_count); - rdpmcl(hwc->event_base_rdpmc, new); + + /* + * Some uncore PMUs do not have RDPMC assignments. In such cases, + * read counts directly from the corresponding PERF_CTR. + */ + if (hwc->event_base_rdpmc < 0) + rdmsrl(hwc->event_base, new); + else + rdpmcl(hwc->event_base_rdpmc, new); + local64_set(&hwc->prev_count, new); delta = (new << COUNTER_SHIFT) - (prev << COUNTER_SHIFT); delta >>= COUNTER_SHIFT; @@ -164,6 +173,9 @@ out: hwc->event_base_rdpmc = pmu->rdpmc_base + hwc->idx; hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED; + if (pmu->rdpmc_base < 0) + hwc->event_base_rdpmc = -1; + if (flags & PERF_EF_START) event->pmu->start(event, PERF_EF_RELOAD); |