[PATCH] target/ppc: Implement gathering irq statistics

[BALATON Zoltan]

Count exceptions which can be queried with info irq monitor command.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 target/ppc/cpu.h         |  1 +
 target/ppc/cpu_init.c    | 18 ++++++++++++++++++
 target/ppc/excp_helper.c |  1 +
 3 files changed, 20 insertions(+)

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index c7c2a5534c..d3a9197e02 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1194,6 +1194,7 @@ struct CPUArchState {
     int error_code;
     uint32_t pending_interrupts;
 #if !defined(CONFIG_USER_ONLY)
+    uint64_t excp_stats[POWERPC_EXCP_NB];
     /*
      * This is the IRQ controller, which is implementation dependent and only
      * relevant when emulating a complete machine. Note that this isn't used
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 05bf73296b..716f2b5d64 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -48,6 +48,7 @@
 
 #ifndef CONFIG_USER_ONLY
 #include "hw/boards.h"
+#include "hw/intc/intc.h"
 #endif
 
 /* #define PPC_DEBUG_SPR */
@@ -7123,6 +7124,16 @@ static bool ppc_cpu_is_big_endian(CPUState *cs)
     return !FIELD_EX64(env->msr, MSR, LE);
 }
 
+static bool ppc_get_irq_stats(InterruptStatsProvider *obj,
+                              uint64_t **irq_counts, unsigned int *nb_irqs)
+{
+    CPUPPCState *env = &POWERPC_CPU(obj)->env;
+
+    *irq_counts = env->excp_stats;
+    *nb_irqs = ARRAY_SIZE(env->excp_stats);
+    return true;
+}
+
 #ifdef CONFIG_TCG
 static void ppc_cpu_exec_enter(CPUState *cs)
 {
@@ -7286,6 +7297,7 @@ static void ppc_cpu_class_init(ObjectClass *oc, void 
*data)
     cc->gdb_write_register = ppc_cpu_gdb_write_register;
 #ifndef CONFIG_USER_ONLY
     cc->sysemu_ops = &ppc_sysemu_ops;
+    INTERRUPT_STATS_PROVIDER_CLASS(oc)->get_statistics = ppc_get_irq_stats;
 #endif
 
     cc->gdb_num_core_regs = 71;
@@ -7323,6 +7335,12 @@ static const TypeInfo ppc_cpu_type_info = {
     .abstract = true,
     .class_size = sizeof(PowerPCCPUClass),
     .class_init = ppc_cpu_class_init,
+#ifndef CONFIG_USER_ONLY
+    .interfaces = (InterfaceInfo[]) {
+          { TYPE_INTERRUPT_STATS_PROVIDER },
+          { }
+    },
+#endif
 };
 
 #ifndef CONFIG_USER_ONLY
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index fea9221501..5480d9d2c7 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -1652,6 +1652,7 @@ static void powerpc_excp(PowerPCCPU *cpu, int excp)
     qemu_log_mask(CPU_LOG_INT, "Raise exception at " TARGET_FMT_lx
                   " => %s (%d) error=%02x\n", env->nip, 
powerpc_excp_name(excp),
                   excp, env->error_code);
+    env->excp_stats[excp]++;
 
     switch (env->excp_model) {
     case POWERPC_EXCP_40x:
-- 
2.30.9