[PULL,25/96] target/ppc: Add helpers to check for SMT sibling threads

Commit Message

Nicholas Piggin July 25, 2024, 11:52 p.m. UTC

Add helpers for TCG code to determine if there are SMT siblings
sharing per-core and per-lpar registers. This simplifies the
callers and makes SMT register topology simpler to modify with
later changes.

Reviewed-by: Harsh Prateek Bora <[e-mail]>
Signed-off-by: Nicholas Piggin <[e-mail]>
---
 target/ppc/cpu.h             | 11 +++++++++++
 target/ppc/cpu_init.c        |  2 +-
 target/ppc/excp_helper.c     | 17 +++++------------
 target/ppc/misc_helper.c     | 27 ++++++---------------------
 target/ppc/timebase_helper.c | 20 +++++++-------------
 5 files changed, 30 insertions(+), 47 deletions(-)

Patch

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 7b52a9bb18..417b284318 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1512,6 +1512,17 @@  struct PowerPCCPUClass {
     int  (*check_attn)(CPUPPCState *env);
 };
 
+static inline bool ppc_cpu_core_single_threaded(CPUState *cs)
+{
+    return cs->nr_threads == 1;
+}
+
+static inline bool ppc_cpu_lpar_single_threaded(CPUState *cs)
+{
+    return !(POWERPC_CPU(cs)->env.flags & POWERPC_FLAG_SMT_1LPAR) ||
+           ppc_cpu_core_single_threaded(cs);
+}
+
 ObjectClass *ppc_cpu_class_by_name(const char *name);
 PowerPCCPUClass *ppc_cpu_class_by_pvr(uint32_t pvr);
 PowerPCCPUClass *ppc_cpu_class_by_pvr_mask(uint32_t pvr);
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 42bb047b54..5ec87c56e4 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -6976,7 +6976,7 @@  static void ppc_cpu_realize(DeviceState *dev, Error **errp)
 
     pcc->parent_realize(dev, errp);
 
-    if (env_cpu(env)->nr_threads > 1) {
+    if (!ppc_cpu_core_single_threaded(cs)) {
         env->flags |= POWERPC_FLAG_SMT;
     }
 
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index c0120c8a88..f33fc36db2 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -3005,18 +3005,11 @@  static void msgsnd_core_tir(CPUPPCState *env, uint32_t target_tir, int irq)
 {
     PowerPCCPU *cpu = env_archcpu(env);
     CPUState *cs = env_cpu(env);
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (!(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
-        nr_threads = 1; /* msgsndp behaves as 1-thread in LPAR-per-thread mode*/
-    }
-
-    if (target_tir >= nr_threads) {
-        return;
-    }
-
-    if (nr_threads == 1) {
-        ppc_set_irq(cpu, irq, 1);
+    if (ppc_cpu_lpar_single_threaded(cs)) {
+        if (target_tir == 0) {
+            ppc_set_irq(cpu, irq, 1);
+        }
     } else {
         CPUState *ccs;
 
@@ -3071,7 +3064,7 @@  void helper_book3s_msgsnd(CPUPPCState *env, target_ulong rb)
         brdcast = true;
     }
 
-    if (cs->nr_threads == 1 || !brdcast) {
+    if (ppc_cpu_core_single_threaded(cs) || !brdcast) {
         ppc_set_irq(cpu, PPC_INTERRUPT_HDOORBELL, 1);
         return;
     }
diff --git a/target/ppc/misc_helper.c b/target/ppc/misc_helper.c
index de7c8813ec..9789d69664 100644
--- a/target/ppc/misc_helper.c
+++ b/target/ppc/misc_helper.c
@@ -48,9 +48,8 @@  void helper_spr_core_write_generic(CPUPPCState *env, uint32_t sprn,
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (nr_threads == 1) {
+    if (ppc_cpu_core_single_threaded(cs)) {
         env->spr[sprn] = val;
         return;
     }
@@ -195,7 +194,7 @@  void helper_store_ptcr(CPUPPCState *env, target_ulong val)
             return;
         }
 
-        if (cs->nr_threads == 1 || !(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
+        if (ppc_cpu_lpar_single_threaded(cs)) {
             env->spr[SPR_PTCR] = val;
             tlb_flush(cs);
         } else {
@@ -242,16 +241,12 @@  target_ulong helper_load_dpdes(CPUPPCState *env)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
     target_ulong dpdes = 0;
 
     helper_hfscr_facility_check(env, HFSCR_MSGP, "load DPDES", HFSCR_IC_MSGP);
 
-    if (!(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
-        nr_threads = 1; /* DPDES behaves as 1-thread in LPAR-per-thread mode */
-    }
-
-    if (nr_threads == 1) {
+    /* DPDES behaves as 1-thread in LPAR-per-thread mode */
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         if (env->pending_interrupts & PPC_INTERRUPT_DOORBELL) {
             dpdes = 1;
         }
@@ -278,21 +273,11 @@  void helper_store_dpdes(CPUPPCState *env, target_ulong val)
     PowerPCCPU *cpu = env_archcpu(env);
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
     helper_hfscr_facility_check(env, HFSCR_MSGP, "store DPDES", HFSCR_IC_MSGP);
 
-    if (!(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
-        nr_threads = 1; /* DPDES behaves as 1-thread in LPAR-per-thread mode */
-    }
-
-    if (val & ~(nr_threads - 1)) {
-        qemu_log_mask(LOG_GUEST_ERROR, "Invalid DPDES register value "
-                      TARGET_FMT_lx"\n", val);
-        val &= (nr_threads - 1); /* Ignore the invalid bits */
-    }
-
-    if (nr_threads == 1) {
+    /* DPDES behaves as 1-thread in LPAR-per-thread mode */
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         ppc_set_irq(cpu, PPC_INTERRUPT_DOORBELL, val & 0x1);
         return;
     }
diff --git a/target/ppc/timebase_helper.c b/target/ppc/timebase_helper.c
index b02535bbd5..d86112d60a 100644
--- a/target/ppc/timebase_helper.c
+++ b/target/ppc/timebase_helper.c
@@ -62,9 +62,8 @@  void helper_store_purr(CPUPPCState *env, target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (nr_threads == 1 || !(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         cpu_ppc_store_purr(env, val);
         return;
     }
@@ -81,9 +80,8 @@  void helper_store_tbl(CPUPPCState *env, target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (nr_threads == 1 || !(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         cpu_ppc_store_tbl(env, val);
         return;
     }
@@ -98,9 +96,8 @@  void helper_store_tbu(CPUPPCState *env, target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (nr_threads == 1 || !(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         cpu_ppc_store_tbu(env, val);
         return;
     }
@@ -140,9 +137,8 @@  void helper_store_hdecr(CPUPPCState *env, target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (nr_threads == 1 || !(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         cpu_ppc_store_hdecr(env, val);
         return;
     }
@@ -157,9 +153,8 @@  void helper_store_vtb(CPUPPCState *env, target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (nr_threads == 1 || !(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         cpu_ppc_store_vtb(env, val);
         return;
     }
@@ -174,9 +169,8 @@  void helper_store_tbu40(CPUPPCState *env, target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
-    uint32_t nr_threads = cs->nr_threads;
 
-    if (nr_threads == 1 || !(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
+    if (ppc_cpu_lpar_single_threaded(cs)) {
         cpu_ppc_store_tbu40(env, val);
         return;
     }
@@ -293,7 +287,7 @@  static void write_tfmr(CPUPPCState *env, target_ulong val)
 {
     CPUState *cs = env_cpu(env);
 
-    if (cs->nr_threads == 1) {
+    if (ppc_cpu_core_single_threaded(cs)) {
         env->spr[SPR_TFMR] = val;
     } else {
         CPUState *ccs;