[PATCH v2 08/16] target/ppc/power8_pmu.c: add PMC14/PMC56 counter freeze bits

[Daniel Henrique Barboza <danielhb413@gmail.com>]

We're missing two counter freeze bits that are used to further control
how the PMCs behaves: MMCR0_FC14 and MMCR0_FC56. These bits can frozen
PMCs separately: MMCR0_FC14 freezes PMCs 1 to 4 and MMCR0_FC56 freezes
PMCs 5 and 6.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 target/ppc/cpu.h        |  2 ++
 target/ppc/power8_pmu.c | 25 ++++++++++++++++++++++---
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 60e5e1159a..105ee75a01 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -349,6 +349,8 @@ typedef struct ppc_v3_pate_t {
 #define MMCR0_EBE   PPC_BIT(43)         /* Perf Monitor EBB Enable */
 #define MMCR0_FCECE PPC_BIT(38)         /* FC on Enabled Cond or Event */
 #define MMCR0_PMCC  PPC_BITMASK(44, 45) /* PMC Control */
+#define MMCR0_FC14 PPC_BIT(58)
+#define MMCR0_FC56 PPC_BIT(59)
 
 #define MMCR1_PMC1SEL_SHIFT (63 - 39)
 #define MMCR1_PMC1SEL PPC_BITMASK(32, 39)
diff --git a/target/ppc/power8_pmu.c b/target/ppc/power8_pmu.c
index 9154fca5fd..4545fe7810 100644
--- a/target/ppc/power8_pmu.c
+++ b/target/ppc/power8_pmu.c
@@ -58,6 +58,15 @@ static uint8_t get_PMC_event(CPUPPCState *env, int sprn)
     return event;
 }
 
+static bool pmc_is_running(CPUPPCState *env, int sprn)
+{
+    if (sprn < SPR_POWER_PMC5) {
+        return !(env->spr[SPR_POWER_MMCR0] & MMCR0_FC14);
+    }
+
+    return !(env->spr[SPR_POWER_MMCR0] & MMCR0_FC56);
+}
+
 static void update_programmable_PMC_reg(CPUPPCState *env, int sprn,
                                         uint64_t time_delta)
 {
@@ -90,13 +99,19 @@ static void update_cycles_PMCs(CPUPPCState *env)
 {
     uint64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
     uint64_t time_delta = now - env->pmu_base_time;
+    bool PMC14_running = !(env->spr[SPR_POWER_MMCR0] & MMCR0_FC14);
+    bool PMC6_running = !(env->spr[SPR_POWER_MMCR0] & MMCR0_FC56);
     int sprn;
 
-    for (sprn = SPR_POWER_PMC1; sprn < SPR_POWER_PMC5; sprn++) {
-        update_programmable_PMC_reg(env, sprn, time_delta);
+    if (PMC14_running) {
+        for (sprn = SPR_POWER_PMC1; sprn < SPR_POWER_PMC5; sprn++) {
+            update_programmable_PMC_reg(env, sprn, time_delta);
+        }
     }
 
-    update_PMC_PM_CYC(env, SPR_POWER_PMC6, time_delta);
+    if (PMC6_running) {
+        update_PMC_PM_CYC(env, SPR_POWER_PMC6, time_delta);
+    }
 }
 
 void helper_store_mmcr0(CPUPPCState *env, target_ulong value)
@@ -136,6 +151,10 @@ static bool pmc_counting_insns(CPUPPCState *env, int sprn,
 {
     bool ret = false;
 
+    if (!pmc_is_running(env, sprn)) {
+        return false;
+    }
+
     if (sprn == SPR_POWER_PMC5) {
         return true;
     }
-- 
2.31.1