[PATCH 5/5] powerpc/perf: Re organize PMU branch filter processing on POWER8

[Anshuman Khandual]

This patch does some code re-arrangements to make it clear that kernel
ignores any separate privilege level branch filter request and does not
support any combinations of HW PMU branch filters.

Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm.com>
---
 arch/powerpc/perf/power8-pmu.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/perf/power8-pmu.c b/arch/powerpc/perf/power8-pmu.c
index 396351d..a6c6a2c 100644
--- a/arch/powerpc/perf/power8-pmu.c
+++ b/arch/powerpc/perf/power8-pmu.c
@@ -656,8 +656,6 @@ static int power8_generic_events[] = {
 
 static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 {
-	u64 pmu_bhrb_filter = 0;
-
 	/* BHRB and regular PMU events share the same privilege state
 	 * filter configuration. BHRB is always recorded along with a
 	 * regular PMU event. As the privilege state filter is handled
@@ -665,21 +663,15 @@ static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 	 * PMU event, we ignore any separate BHRB specific request.
 	 */
 
-	/* No branch filter requested */
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY)
-		return pmu_bhrb_filter;
-
-	/* Invalid branch filter options - HW does not support */
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN)
-		return -1;
+	/* Ignore user, kernel, hv bits */
+	branch_sample_type &= ~PERF_SAMPLE_BRANCH_PLM_ALL;
 
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL)
-		return -1;
+	/* No branch filter requested */
+	if (branch_sample_type == PERF_SAMPLE_BRANCH_ANY)
+		return 0;
 
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
-		pmu_bhrb_filter |= POWER8_MMCRA_IFM1;
-		return pmu_bhrb_filter;
-	}
+	if (branch_sample_type == PERF_SAMPLE_BRANCH_ANY_CALL)
+		return POWER8_MMCRA_IFM1;
 
 	/* Every thing else is unsupported */
 	return -1;
-- 
2.1.0