[kvm-unit-tests PATCH v2 3/9] arm: pmu: Add a pmu struct

[Eric Auger]

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 <address@hidden>
---
 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