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authorMichael Ellerman <michael@ellerman.id.au>2013-10-02 18:04:06 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-13 16:08:31 -0700
commit09bee3bc290da5f7f39b62f65f1a3deeaa3834ac (patch)
tree9e64d3ee36f03538cc8bfb7f8634df3d4e0455fe /arch/powerpc
parente98d86aaa251cbd7c9745a3743ec4fa0c7c54c25 (diff)
downloadlinaro-lsk-09bee3bc290da5f7f39b62f65f1a3deeaa3834ac.tar.gz
powerpc/perf: Fix handling of FAB events
commit a53b27b3abeef406de92a2bb0ceb6fb4c3fb8fc4 upstream. Commit 4df4899 "Add power8 EBB support" included a bug in the handling of the FAB_CRESP_MATCH and FAB_TYPE_MATCH fields. These values are pulled out of the event code using EVENT_THR_CTL_SHIFT, however we were then or'ing that value directly into MMCR1. This meant we were failing to set the FAB fields correctly, and also potentially corrupting the value for PMC4SEL. Leading to no counts for the FAB events and incorrect counts for PMC4. The fix is simply to shift left the FAB value correctly before or'ing it with MMCR1. Reported-by: Sooraj Ravindran Nair <soonair3@in.ibm.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/perf/power8-pmu.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/perf/power8-pmu.c b/arch/powerpc/perf/power8-pmu.c
index d59f5b2d4c2..9aefaebedef 100644
--- a/arch/powerpc/perf/power8-pmu.c
+++ b/arch/powerpc/perf/power8-pmu.c
@@ -194,6 +194,7 @@
#define MMCR1_UNIT_SHIFT(pmc) (60 - (4 * ((pmc) - 1)))
#define MMCR1_COMBINE_SHIFT(pmc) (35 - ((pmc) - 1))
#define MMCR1_PMCSEL_SHIFT(pmc) (24 - (((pmc) - 1)) * 8)
+#define MMCR1_FAB_SHIFT 36
#define MMCR1_DC_QUAL_SHIFT 47
#define MMCR1_IC_QUAL_SHIFT 46
@@ -367,8 +368,8 @@ static int power8_compute_mmcr(u64 event[], int n_ev,
* the threshold bits are used for the match value.
*/
if (event_is_fab_match(event[i])) {
- mmcr1 |= (event[i] >> EVENT_THR_CTL_SHIFT) &
- EVENT_THR_CTL_MASK;
+ mmcr1 |= ((event[i] >> EVENT_THR_CTL_SHIFT) &
+ EVENT_THR_CTL_MASK) << MMCR1_FAB_SHIFT;
} else {
val = (event[i] >> EVENT_THR_CTL_SHIFT) & EVENT_THR_CTL_MASK;
mmcra |= val << MMCRA_THR_CTL_SHIFT;