[PATCH V5 11/14] perf/x86: Use event_base_rdpmc for RDPMC userspace support

kan.liang
2019-11-03T23:30:45Z

The RDPMC index is always re-calculated in RDPMC userspace support,
especially for fixed counters.

The RDPMC index value is stored in variable event_base_rdpmc for kernel
usage, which can be used for RDPMC userspace support as well. Only the
metrics event has to be specially handled.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---

No changes since V4

arch/x86/events/core.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 48dd920c5e7d..3ab18277e4a7 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2203,20 +2203,16 @@ static void x86_pmu_event_unmapped(struct perf_event *event, struct mm_struct *m

static int x86_pmu_event_idx(struct perf_event *event)
{
- int idx = event->hw.idx;
+ struct hw_perf_event *hwc = &event->hw;

- if (!(event->hw.flags & PERF_X86_EVENT_RDPMC_ALLOWED))
+ if (!(hwc->flags & PERF_X86_EVENT_RDPMC_ALLOWED))
return 0;

/* Return PERF_METRICS MSR value for metrics event */
- if (is_metric_idx(idx))
- idx = 1 << 29;
- else if (x86_pmu.num_counters_fixed && idx >= INTEL_PMC_IDX_FIXED) {
- idx -= INTEL_PMC_IDX_FIXED;
- idx |= 1 << 30;
- }
-
- return idx + 1;
+ if (is_metric_idx(hwc->idx))
+ return (1 << 29) + 1;
+ else
+ return hwc->event_base_rdpmc + 1;
}

static ssize_t get_attr_rdpmc(struct device *cdev,
--
2.17.1