[kvm-unit-tests PATCH v4 04/12] 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>
Reviewed-by: Andre Przywara <address@hidden>

---

v2 -> v3:
- Fix pmcr_ro and add a comment
---
 arm/pmu.c | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/arm/pmu.c b/arm/pmu.c
index 44f3543..d827e82 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
@@ -242,7 +249,7 @@ 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");
@@ -257,18 +264,24 @@ static bool pmu_probe(void)
 {
        uint32_t pmcr;
 
-       pmu_version = get_pmu_version();
-       if (pmu_version == 0 || pmu_version == 0xf)
+       pmu.version = get_pmu_version();
+       if (pmu.version == 0 || pmu.version == 0xf)
                return false;
 
-       report_info("PMU version: %d", pmu_version);
+       report_info("PMU version: %d", pmu.version);
 
        pmcr = get_pmcr();
-       report_info("PMU implementer/ID code/counters: %#x(\"%c\")/%#x/%d",
+       report_info("PMU implementer/ID code: %#x(\"%c\")/%#x",
                    (pmcr >> PMU_PMCR_IMP_SHIFT) & PMU_PMCR_IMP_MASK,
                    ((pmcr >> PMU_PMCR_IMP_SHIFT) & PMU_PMCR_IMP_MASK) ? : ' ',
-                   (pmcr >> PMU_PMCR_ID_SHIFT) & PMU_PMCR_ID_MASK,
-                   (pmcr >> PMU_PMCR_N_SHIFT) & PMU_PMCR_N_MASK);
+                   (pmcr >> PMU_PMCR_ID_SHIFT) & PMU_PMCR_ID_MASK);
+
+       /* store read-only and RES0 fields of the PMCR bottom-half*/
+       pmu.pmcr_ro = pmcr & 0xFFFFFF00;
+       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;
 }
-- 
2.20.1