linux-kernel - [PATCH V2 2/6] powerpc, perf: Enable conditional branch filter for POWER8

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Date:	Fri, 30 Aug 2013 09:54:46 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Cc:	eranian@...gle.com, acme@...hat.com, michael.neuling@....ibm.com,
	ellerman@....ibm.com, svaidy@...ux.vnet.ibm.com,
	sukadev@...ux.vnet.ibm.com
Subject: [PATCH V2 2/6] powerpc, perf: Enable conditional branch filter for POWER8

Enables conditional branch filter support for POWER8
utilizing MMCRA register based filter and also invalidates
a BHRB branch filter combination involving conditional
branches.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 arch/powerpc/perf/power8-pmu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/powerpc/perf/power8-pmu.c b/arch/powerpc/perf/power8-pmu.c
index 2ee4a70..6e28587 100644
--- a/arch/powerpc/perf/power8-pmu.c
+++ b/arch/powerpc/perf/power8-pmu.c
@@ -580,11 +580,21 @@ static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 	if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL)
 		return -1;
 
+	/* Invalid branch filter combination - HW does not support */
+	if ((branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) &&
+			(branch_sample_type & PERF_SAMPLE_BRANCH_COND))
+		return -1;
+
 	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_COND) {
+		pmu_bhrb_filter |= POWER8_MMCRA_IFM3;
+		return pmu_bhrb_filter;
+	}
+
 	/* Every thing else is unsupported */
 	return -1;
 }
-- 
1.7.11.7

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