[Qemu-devel] [PATCH 3/7] allwinner-a10-pit: avoid generation of spurious interrupts

[Beniamino Galvani <b.galvani@gmail.com>]

The model was generating interrupts for all enabled timers after the
expiration of one of them. Avoid this by passing to the timer callback
function a structure containing the index of the expired timer.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
---
 hw/timer/allwinner-a10-pit.c |   30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/hw/timer/allwinner-a10-pit.c b/hw/timer/allwinner-a10-pit.c
index b27fce8..3e1c183 100644
--- a/hw/timer/allwinner-a10-pit.c
+++ b/hw/timer/allwinner-a10-pit.c
@@ -19,6 +19,11 @@
 #include "sysemu/sysemu.h"
 #include "hw/timer/allwinner-a10-pit.h"
 
+typedef struct TimerContext {
+    AwA10PITState *state;
+    int index;
+} TimerContext;
+
 static uint64_t a10_pit_read(void *opaque, hwaddr offset, unsigned size)
 {
     AwA10PITState *s = AW_A10_PIT(opaque);
@@ -193,18 +198,17 @@ static void a10_pit_reset(DeviceState *dev)
 
 static void a10_pit_timer_cb(void *opaque)
 {
-    AwA10PITState *s = AW_A10_PIT(opaque);
-    uint8_t i;
+    TimerContext *tc = opaque;
+    AwA10PITState *s = tc->state;
+    uint8_t i = tc->index;
 
-    for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
-        if (s->control[i] & AW_A10_PIT_TIMER_EN) {
-            s->irq_status |= 1 << i;
-            if (s->control[i] & AW_A10_PIT_TIMER_MODE) {
-                ptimer_stop(s->timer[i]);
-                s->control[i] &= ~AW_A10_PIT_TIMER_EN;
-            }
-            qemu_irq_pulse(s->irq[i]);
+    if (s->control[i] & AW_A10_PIT_TIMER_EN) {
+        s->irq_status |= 1 << i;
+        if (s->control[i] & AW_A10_PIT_TIMER_MODE) {
+            ptimer_stop(s->timer[i]);
+            s->control[i] &= ~AW_A10_PIT_TIMER_EN;
         }
+        qemu_irq_pulse(s->irq[i]);
     }
 }
 
@@ -213,6 +217,7 @@ static void a10_pit_init(Object *obj)
     AwA10PITState *s = AW_A10_PIT(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
     QEMUBH * bh[AW_A10_PIT_TIMER_NR];
+    TimerContext *tc;
     uint8_t i;
 
     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
@@ -223,7 +228,10 @@ static void a10_pit_init(Object *obj)
     sysbus_init_mmio(sbd, &s->iomem);
 
     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
-        bh[i] = qemu_bh_new(a10_pit_timer_cb, s);
+        tc = g_malloc(sizeof(TimerContext));
+        tc->state = s;
+        tc->index = i;
+        bh[i] = qemu_bh_new(a10_pit_timer_cb, tc);
         s->timer[i] = ptimer_init(bh[i]);
         ptimer_set_freq(s->timer[i], 240000);
     }
-- 
1.7.10.4