[PATCH 01/19] target/ppc: add exclusive Book3S PMU reg read/write functions

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

The PowerPC PMU, as described by PowerISA v3.1, has a lot of functions
that freezes, resets and sets counters to specific values depending on
the circuntances. Some of these are trigged based on read/value of the
PMU registers (MMCR0, MMCR1, MMCR2, MMCRA and PMC counters).

Having to handle the PMU logic using the generic read/write functions
can impact all other registers that has nothing to do with the PMU that
uses these functions. This patch creates two new functions,
spr_read_pmu_generic() and spr_write_pmu_generic, that will be used later
on to handle PMU logic together with the read/write of PMU registers.

We're not ready to add specific PMU logic in these new functions yet, so
for now these are just stubs that calls spr_read/write_generic(). No
functional change is made.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 target/ppc/cpu_init.c  | 24 ++++++++++++------------
 target/ppc/spr_tcg.h   |  2 ++
 target/ppc/translate.c | 12 ++++++++++++
 3 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 505a0ed6ac..021c1bc750 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -6821,47 +6821,47 @@ static void register_book3s_pmu_sup_sprs(CPUPPCState *env)
 {
     spr_register_kvm(env, SPR_POWER_MMCR0, "MMCR0",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_MMCR0, 0x00000000);
     spr_register_kvm(env, SPR_POWER_MMCR1, "MMCR1",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_MMCR1, 0x00000000);
     spr_register_kvm(env, SPR_POWER_MMCRA, "MMCRA",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_MMCRA, 0x00000000);
     spr_register_kvm(env, SPR_POWER_PMC1, "PMC1",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_PMC1, 0x00000000);
     spr_register_kvm(env, SPR_POWER_PMC2, "PMC2",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_PMC2, 0x00000000);
     spr_register_kvm(env, SPR_POWER_PMC3, "PMC3",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_PMC3, 0x00000000);
     spr_register_kvm(env, SPR_POWER_PMC4, "PMC4",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_PMC4, 0x00000000);
     spr_register_kvm(env, SPR_POWER_PMC5, "PMC5",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, spr_write_pmu_generic,
                      KVM_REG_PPC_PMC5, 0x00000000);
     spr_register_kvm(env, SPR_POWER_PMC6, "PMC6",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_PMC6, 0x00000000);
     spr_register_kvm(env, SPR_POWER_SIAR, "SIAR",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_SIAR, 0x00000000);
     spr_register_kvm(env, SPR_POWER_SDAR, "SDAR",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_SDAR, 0x00000000);
 }
 
@@ -6941,7 +6941,7 @@ static void register_power8_pmu_sup_sprs(CPUPPCState *env)
 {
     spr_register_kvm(env, SPR_POWER_MMCR2, "MMCR2",
                      SPR_NOACCESS, SPR_NOACCESS,
-                     &spr_read_generic, &spr_write_generic,
+                     &spr_read_pmu_generic, &spr_write_pmu_generic,
                      KVM_REG_PPC_MMCR2, 0x00000000);
     spr_register_kvm(env, SPR_POWER_MMCRS, "MMCRS",
                      SPR_NOACCESS, SPR_NOACCESS,
diff --git a/target/ppc/spr_tcg.h b/target/ppc/spr_tcg.h
index 0be5f347d5..2aab5878a0 100644
--- a/target/ppc/spr_tcg.h
+++ b/target/ppc/spr_tcg.h
@@ -25,6 +25,8 @@
 void spr_noaccess(DisasContext *ctx, int gprn, int sprn);
 void spr_read_generic(DisasContext *ctx, int gprn, int sprn);
 void spr_write_generic(DisasContext *ctx, int sprn, int gprn);
+void spr_read_pmu_generic(DisasContext *ctx, int gprn, int sprn);
+void spr_write_pmu_generic(DisasContext *ctx, int sprn, int gprn);
 void spr_read_xer(DisasContext *ctx, int gprn, int sprn);
 void spr_write_xer(DisasContext *ctx, int sprn, int gprn);
 void spr_read_lr(DisasContext *ctx, int gprn, int sprn);
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 171b216e17..c8f3878002 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -385,6 +385,12 @@ void spr_read_generic(DisasContext *ctx, int gprn, int sprn)
     spr_load_dump_spr(sprn);
 }
 
+void spr_read_pmu_generic(DisasContext *ctx, int gprn, int sprn)
+{
+    /* For now it's just a call to spr_read_generic() */
+    spr_read_generic(ctx, gprn, sprn);
+}
+
 static void spr_store_dump_spr(int sprn)
 {
 #ifdef PPC_DUMP_SPR_ACCESSES
@@ -400,6 +406,12 @@ void spr_write_generic(DisasContext *ctx, int sprn, int gprn)
     spr_store_dump_spr(sprn);
 }
 
+void spr_write_pmu_generic(DisasContext *ctx, int sprn, int gprn)
+{
+    /* For now it's just a call to spr_write_generic() */
+    spr_write_generic(ctx, sprn, gprn);
+}
+
 #if !defined(CONFIG_USER_ONLY)
 void spr_write_generic32(DisasContext *ctx, int sprn, int gprn)
 {
-- 
2.31.1