linux-kernel - [PATCH V4 02/10] powerpc, perf: Enable conditional branch filter for POWER8

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Message-Id: <1386153162-11225-3-git-send-email-khandual@linux.vnet.ibm.com>
Date:	Wed,  4 Dec 2013 16:02:34 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Cc:	michael@...erman.id.au, mikey@...ling.org,
	sukadev@...ux.vnet.ibm.com, eranian@...gle.com,
	acme@...stprotocols.net, ak@...ux.intel.com, mingo@...nel.org
Subject: [PATCH V4 02/10] powerpc, perf: Enable conditional branch filter for POWER8

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

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 a3f7abd..e88b9cb 100644
--- a/arch/powerpc/perf/power8-pmu.c
+++ b/arch/powerpc/perf/power8-pmu.c
@@ -586,6 +586,16 @@ static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 		return pmu_bhrb_filter;
 	}
 
+	if (branch_sample_type & PERF_SAMPLE_BRANCH_COND) {
+		pmu_bhrb_filter |= POWER8_MMCRA_IFM3;
+		return pmu_bhrb_filter;
+	}
+
+	/* PMU does not support ANY combination of HW BHRB filters */
+	if ((branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) &&
+			(branch_sample_type & PERF_SAMPLE_BRANCH_COND))
+		return -1;
+
 	/* Every thing else is unsupported */
 	return -1;
 }
-- 
1.7.11.7

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