[PATCH v3 20/23] arm64: perf: Count EL2 events if the kernel is running in HYP

Marc Zyngier
2016-02-03T18:02:08Z

When the kernel is running in HYP (with VHE), it is necessary to
include EL2 events if the user requests counting kernel or
hypervisor events.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/kernel/perf_event.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index f7ab14c..6013a38 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -20,6 +20,7 @@
*/

#include <asm/irq_regs.h>
+#include <asm/virt.h>

#include <linux/of.h>
#include <linux/perf/arm_pmu.h>
@@ -693,10 +694,15 @@ static int armv8pmu_set_event_filter(struct hw_perf_event *event,
return -EPERM;
if (attr->exclude_user)
config_base |= ARMV8_EXCLUDE_EL0;
- if (attr->exclude_kernel)
- config_base |= ARMV8_EXCLUDE_EL1;
- if (!attr->exclude_hv)
- config_base |= ARMV8_INCLUDE_EL2;
+ if (is_kernel_in_hyp_mode()) {
+ if (!attr->exclude_kernel || !attr->exclude_hv)
+ config_base |= ARMV8_INCLUDE_EL2;
+ } else {
+ if (attr->exclude_kernel)
+ config_base |= ARMV8_EXCLUDE_EL1;
+ if (!attr->exclude_hv)
+ config_base |= ARMV8_INCLUDE_EL2;
+ }

/*
* Install the filter into config_base as this is used to
--
2.1.4