Beginning with just a read of the control register, add plumbing
for testing the ARM Performance Monitors Unit (PMU).
Signed-off-by: Christopher Covington <cov@xxxxxxxxxxxxxx>
---
arm/pmu.c | 31 +++++++++++++++++++++++++++++++
arm/unittests.cfg | 5 +++++
config/config-arm-common.mak | 4 +++-
3 files changed, 39 insertions(+), 1 deletion(-)
create mode 100644 arm/pmu.c
diff --git a/arm/pmu.c b/arm/pmu.c
new file mode 100644
index 0000000..b1e3c7a
--- /dev/null
+++ b/arm/pmu.c
@@ -0,0 +1,31 @@
+#include "libcflat.h"
+
+union pmcr_el0 {
+ struct {
+ unsigned int implementor:8;
+ unsigned int identification_code:8;
+ unsigned int num_counters:5;
+ unsigned int zeros:4;
+ unsigned int cycle_counter_long:1;
+ unsigned int cycle_counter_disable_when_prohibited:1;
+ unsigned int event_counter_export:1;
+ unsigned int cycle_counter_clock_divider:1;
+ unsigned int cycle_counter_reset:1;
+ unsigned int event_counter_reset:1;
+ unsigned int enable:1;
+ } split;
+ uint32_t full;
+};
+
+int main()
+{
+ union pmcr_el0 pmcr;
+
+ asm volatile("mrs %0, pmcr_el0\n" : "=r" (pmcr));
+
+ printf("PMU implementor: 0x%x\n", pmcr.split.implementor);
+ printf("Identification code: 0x%x\n", pmcr.split.identification_code);
+ printf("Event counters: %d\n", pmcr.split.num_counters);
+
+ return report_summary();
+}
diff --git a/arm/unittests.cfg b/arm/unittests.cfg
index e068a0c..d3deb6a 100644
--- a/arm/unittests.cfg
+++ b/arm/unittests.cfg
@@ -35,3 +35,8 @@ file = selftest.flat
smp = `getconf _NPROCESSORS_CONF`
extra_params = -append 'smp'
groups = selftest
+
+# Test PMU support
+[pmu]
+file = pmu.flat
+groups = pmu
diff --git a/config/config-arm-common.mak b/config/config-arm-common.mak
index 698555d..b34d04c 100644
--- a/config/config-arm-common.mak
+++ b/config/config-arm-common.mak
@@ -11,7 +11,8 @@ endif
tests-common = \
$(TEST_DIR)/selftest.flat \
- $(TEST_DIR)/spinlock-test.flat
+ $(TEST_DIR)/spinlock-test.flat \
+ $(TEST_DIR)/pmu.flat
all: test_cases
@@ -70,3 +71,4 @@ test_cases: $(generated_files) $(tests-common) $(tests)
$(TEST_DIR)/selftest.elf: $(cstart.o) $(TEST_DIR)/selftest.o
$(TEST_DIR)/spinlock-test.elf: $(cstart.o) $(TEST_DIR)/spinlock-test.o
+$(TEST_DIR)/pmu.elf: $(cstart.o) $(TEST_DIR)/pmu.o
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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