This struct aims at storing information potentially used by
all tests such as the pmu version, the read-only part of the
PMCR, the number of implemented event counters, ...
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
arm/pmu.c | 30 +++++++++++++++++++++++++-----
1 file changed, 25 insertions(+), 5 deletions(-)
diff --git a/arm/pmu.c b/arm/pmu.c
index e5e012d..d24857e 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -33,7 +33,14 @@
#define NR_SAMPLES 10
-static unsigned int pmu_version;
+struct pmu {
+ unsigned int version;
+ unsigned int nb_implemented_counters;
+ uint32_t pmcr_ro;
+};
+
+static struct pmu pmu;
+
#if defined(__arm__)
#define ID_DFR0_PERFMON_SHIFT 24
#define ID_DFR0_PERFMON_MASK 0xf
@@ -265,7 +272,7 @@ static bool check_cpi(int cpi)
static void pmccntr64_test(void)
{
#ifdef __arm__
- if (pmu_version == 0x3) {
+ if (pmu.version == 0x3) {
if (ERRATA(9e3f7a296940)) {
write_sysreg(0xdead, PMCCNTR64);
report(read_sysreg(PMCCNTR64) == 0xdead, "pmccntr64");
@@ -278,9 +285,22 @@ static void pmccntr64_test(void)
/* Return FALSE if no PMU found, otherwise return TRUE */
static bool pmu_probe(void)
{
- pmu_version = get_pmu_version();
- report_info("PMU version: %d", pmu_version);
- return pmu_version != 0 && pmu_version != 0xf;
+ uint32_t pmcr;
+
+ pmu.version = get_pmu_version();
+ report_info("PMU version: %d", pmu.version);
+
+ if (pmu.version == 0 || pmu.version == 0xF)
+ return false;
+
+ pmcr = get_pmcr();
+ pmu.pmcr_ro = pmcr & 0xFFFFFF80;
+ pmu.nb_implemented_counters =
+ (pmcr >> PMU_PMCR_N_SHIFT) & PMU_PMCR_N_MASK;
+ report_info("Implements %d event counters",
+ pmu.nb_implemented_counters);
+
+ return true;
}
int main(int argc, char *argv[])
--
2.20.1
