commit 72c1d3af6e9c2745edfeaa71918a68bcee4b79db
author Peter Maydell <peter.maydell@linaro.org> Mon Mar 10 14:56:30 2014 +0000
committer Peter Maydell <peter.maydell@linaro.org> Mon Mar 10 14:56:30 2014 +0000
tree d7d01966c8d75f5427fc2a9bce5994b17fe79253
parent 2b194951c592ad670ddf3bc5764216408ade46f8

target-arm: Implement WFE as a yield operation

Implement WFE to yield our timeslice to the next CPU.
This avoids slowdowns in multicore configurations caused
by one core busy-waiting on a spinlock which can't possibly
be unlocked until the other core has an opportunity to run.
This speeds up my test case A15 dual-core boot by a factor
of three (though it is still four or five times slower than
a single-core boot).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1393339545-22111-1-git-send-email-peter.maydell@linaro.org
Reviewed-by: Richard Henderson <rth@twiddle.net>
Tested-by: Rob Herring <rob.herring@linaro.org>

target-arm/helper.h

diff --git a/target-arm/helper.h b/target-arm/helper.h
index 276f3a9..8923f8a 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -50,6 +50,7 @@
                    i32, i32, i32, i32)
 DEF_HELPER_2(exception, void, env, i32)
 DEF_HELPER_1(wfi, void, env)
+DEF_HELPER_1(wfe, void, env)
 
 DEF_HELPER_3(cpsr_write, void, env, i32, i32)
 DEF_HELPER_1(cpsr_read, i32, env)

target-arm/op_helper.c

diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 7d06d2f9..5851e04 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -225,6 +225,15 @@
     cpu_loop_exit(env);
 }
 
+void HELPER(wfe)(CPUARMState *env)
+{
+    /* Don't actually halt the CPU, just yield back to top
+     * level loop
+     */
+    env->exception_index = EXCP_YIELD;
+    cpu_loop_exit(env);
+}
+
 void HELPER(exception)(CPUARMState *env, uint32_t excp)
 {
     env->exception_index = excp;

target-arm/translate.c

diff --git a/target-arm/translate.c b/target-arm/translate.c
index 253d2a1..df259de 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -3939,6 +3939,9 @@
         s->is_jmp = DISAS_WFI;
         break;
     case 2: /* wfe */
+        gen_set_pc_im(s, s->pc);
+        s->is_jmp = DISAS_WFE;
+        break;
     case 4: /* sev */
     case 5: /* sevl */
         /* TODO: Implement SEV, SEVL and WFE.  May help SMP performance.  */
@@ -10857,6 +10860,9 @@
         case DISAS_WFI:
             gen_helper_wfi(cpu_env);
             break;
+        case DISAS_WFE:
+            gen_helper_wfe(cpu_env);
+            break;
         case DISAS_SWI:
             gen_exception(EXCP_SWI);
             break;

target-arm/translate.h

diff --git a/target-arm/translate.h b/target-arm/translate.h
index 67da699..2f491f9 100644
--- a/target-arm/translate.h
+++ b/target-arm/translate.h
@@ -44,6 +44,8 @@
  * emitting unreachable code at the end of the TB in the A64 decoder
  */
 #define DISAS_EXC 6
+/* WFE */
+#define DISAS_WFE 7
 
 #ifdef TARGET_AARCH64
 void a64_translate_init(void);