linux-kernel - [PATCH V4 10/10] powerpc, perf: Cleanup SW branch filter list look up

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Message-Id: <1386153162-11225-11-git-send-email-khandual@linux.vnet.ibm.com>
Date:	Wed,  4 Dec 2013 16:02:42 +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 10/10] powerpc, perf: Cleanup SW branch filter list look up

This patch adds enumeration for all available SW branch filters
in powerpc book3s code and also streamlines the look for the
SW branch filter entries while trying to figure out which all
branch filters can be supported in SW.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 arch/powerpc/perf/core-book3s.c | 38 +++++++++++++-------------------------
 1 file changed, 13 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 54d39a5..42c6428 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -566,6 +566,12 @@ static int match_filters(u64 branch_sample_type, u64 filter_mask)
 	return true;
 }
 
+/* SW implemented branch filters */
+static unsigned int power_sw_filter[] =	      { PERF_SAMPLE_BRANCH_ANY_CALL,
+						PERF_SAMPLE_BRANCH_COND,
+						PERF_SAMPLE_BRANCH_ANY_RETURN,
+						PERF_SAMPLE_BRANCH_IND_CALL };
+
 /*
  * Required SW based branch filters
  *
@@ -578,6 +584,7 @@ static u64 branch_filter_map(u64 branch_sample_type, u64 pmu_bhrb_filter,
 			     					u64 *filter_mask)
 {
 	u64 branch_sw_filter = 0;
+	unsigned int i;
 
 	/* No branch filter requested */
 	if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY) {
@@ -593,34 +600,15 @@ static u64 branch_filter_map(u64 branch_sample_type, u64 pmu_bhrb_filter,
 	 * SW implemented filters. But right now, there is now way to
 	 * initimate the user about this decision.
 	 */
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
-		if (!(pmu_bhrb_filter & PERF_SAMPLE_BRANCH_ANY_CALL)) {
-			branch_sw_filter |= PERF_SAMPLE_BRANCH_ANY_CALL;
-			*filter_mask |= PERF_SAMPLE_BRANCH_ANY_CALL;
-		}
-	}
-
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_COND) {
-		if (!(pmu_bhrb_filter & PERF_SAMPLE_BRANCH_COND)) {
-			branch_sw_filter |= PERF_SAMPLE_BRANCH_COND;
-			*filter_mask |= PERF_SAMPLE_BRANCH_COND;
-		}
-	}
 
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN) {
-		if (!(pmu_bhrb_filter & PERF_SAMPLE_BRANCH_ANY_RETURN)) {
-			branch_sw_filter |= PERF_SAMPLE_BRANCH_ANY_RETURN;
-			*filter_mask |= PERF_SAMPLE_BRANCH_ANY_RETURN;
-		}
-	}
-
-	if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL) {
-		if (!(pmu_bhrb_filter & PERF_SAMPLE_BRANCH_IND_CALL)) {
-			branch_sw_filter |= PERF_SAMPLE_BRANCH_IND_CALL;
-			*filter_mask |= PERF_SAMPLE_BRANCH_IND_CALL;
+	for (i = 0; i < ARRAY_SIZE(power_sw_filter); i++) {
+		if (branch_sample_type & power_sw_filter[i]) {
+			if (!(pmu_bhrb_filter & power_sw_filter[i])) {
+				branch_sw_filter |= power_sw_filter[i];
+				*filter_mask |= power_sw_filter[i];
+			}
 		}
 	}
-
 	return branch_sw_filter;
 }
 
-- 
1.7.11.7

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