diff options
authorPawel Moll <pawel.moll@arm.com>2016-08-11 12:00:36 +0100
committerPawel Moll <pawel.moll@arm.com>2016-08-17 11:42:46 +0100
commit3249bce459ff0bb7c1621b00a8e2d6afe24c53bb (patch)
parent90d11e267a32a25d2cb69127174a96b9e518395e (diff)
bus: arm-ccn: Add missing event attribute exclusions for host/guest
CCN PMUs have no knowledge into VM-related origins of the memory traffic, therefore can't handle requests for host-only or guest-only events. Added appropriate exclusions (they should have been there from the beginning). This required changing the error code returned, as the userspace tool only re-negotiates the options (exclude_guest is true by default) only for EINVAL. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/bus/arm-ccn.c b/drivers/bus/arm-ccn.c
index ddb65c117012..02f81e308dff 100644
--- a/drivers/bus/arm-ccn.c
+++ b/drivers/bus/arm-ccn.c
@@ -745,9 +745,10 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
if (has_branch_stack(event) || event->attr.exclude_user ||
event->attr.exclude_kernel || event->attr.exclude_hv ||
- event->attr.exclude_idle) {
+ event->attr.exclude_idle || event->attr.exclude_host ||
+ event->attr.exclude_guest) {
dev_warn(ccn->dev, "Can't exclude execution levels!\n");
- return -EOPNOTSUPP;
+ return -EINVAL;
if (event->cpu < 0) {

Privacy Policy