lkml.org 
[lkml]   [2013]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[V3 02/10] powerpc, perf: Enable conditional branch filter for POWER8
Date
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@linux.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


\
 
 \ /
  Last update: 2013-10-16 09:41    [W:0.094 / U:0.680 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site