[kvm-unit-tests RFC 03/10] pmu: Add a pmu struct

[Eric Auger <eric.auger@redhat.com>]

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@redhat.com>
---
 arm/pmu.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/arm/pmu.c b/arm/pmu.c
index 2ad6469..8e95251 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -33,7 +33,15 @@
 
 #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 +273,7 @@ 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("pmccntr64", read_sysreg(PMCCNTR64) == 0xdead);
@@ -278,9 +286,20 @@ 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