[PATCH v3 09/11] target/openrisc: Interrupt handling fixes

[Stafford Horne <shorne@gmail.com>]

When running SMP systems we sometimes were seeing lockups where
IPI interrupts were being raised by never handled.

This looks to be caused by 2 issues in the openrisc interrupt handling
logic.

 1. After clearing an interrupt the openrisc_cpu_set_irq handler will
    always clear PICSR.  This is not correct as masked interrupts
    should still be visible in PICSR.
 2. After setting PICMR (mask register) and exposed interrupts should
    cause an interrupt to be raised.  This was not being done so add it.

This patch fixes both issues.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
Since v2:
 - Added Reviewed-by

 target/openrisc/cpu.c        | 1 -
 target/openrisc/sys_helper.c | 7 +++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c
index 41d1b2a24a..cb9f35f408 100644
--- a/target/openrisc/cpu.c
+++ b/target/openrisc/cpu.c
@@ -98,7 +98,6 @@ static void openrisc_cpu_set_irq(void *opaque, int irq, int level)
         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
     } else {
         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
-        cpu->env.picsr = 0;
     }
 }
 #endif
diff --git a/target/openrisc/sys_helper.c b/target/openrisc/sys_helper.c
index da88ad9e77..09b3c97d7c 100644
--- a/target/openrisc/sys_helper.c
+++ b/target/openrisc/sys_helper.c
@@ -139,6 +139,13 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
         break;
     case TO_SPR(9, 0):  /* PICMR */
         env->picmr = rb;
+        qemu_mutex_lock_iothread();
+        if (env->picsr & env->picmr) {
+            cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+        } else {
+            cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+        }
+        qemu_mutex_unlock_iothread();
         break;
     case TO_SPR(9, 2):  /* PICSR */
         env->picsr &= ~rb;
-- 
2.37.1