[Qemu-devel] [PATCH 20/26] Add (virtual) interrupt to PAPR virtual tty device

[David Gibson <david@gibson.dropbear.id.au>]

Now that we have implemented the PAPR "xics" virtualized interrupt
controller, we can add interrupts in PAPR VIO devices.  This patch adds
interrupt support to the PAPR virtual tty/console device.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
---
 hw/spapr.c     |    6 ++++--
 hw/spapr_vio.h |    3 ++-
 hw/spapr_vty.c |   11 ++++++++++-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/hw/spapr.c b/hw/spapr.c
index 5b19963..e7f8864 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -255,6 +255,7 @@ static void ppc_spapr_init(ram_addr_t ram_size,
     int fdt_size;
     sPAPREnvironment *spapr;
     char *filename;
+    int irq = 16;
 
     spapr = qemu_malloc(sizeof(*spapr));
 
@@ -318,9 +319,10 @@ static void ppc_spapr_init(ram_addr_t ram_size,
     /* Set up VIO bus */
     spapr->vio_bus = spapr_vio_bus_init();
 
-    for (i = 0; i < MAX_SERIAL_PORTS; i++) {
+    for (i = 0; i < MAX_SERIAL_PORTS; i++, irq++) {
         if (serial_hds[i]) {
-            spapr_vty_create(spapr->vio_bus, i, serial_hds[i]);
+            spapr_vty_create(spapr->vio_bus, i, serial_hds[i],
+                             xics_find_qirq(spapr->icp, irq), irq);
         }
     }
 
diff --git a/hw/spapr_vio.h b/hw/spapr_vio.h
index 8a000c6..2013927 100644
--- a/hw/spapr_vio.h
+++ b/hw/spapr_vio.h
@@ -51,6 +51,7 @@ extern int spapr_vio_signal(VIOsPAPRDevice *dev, target_ulong mode);
 
 void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len);
 void spapr_vty_create(VIOsPAPRBus *bus,
-                      uint32_t reg, CharDriverState *chardev);
+                      uint32_t reg, CharDriverState *chardev,
+                      qemu_irq qirq, uint32_t vio_irq_num);
 
 #endif /* _HW_SPAPR_VIO_H */
diff --git a/hw/spapr_vty.c b/hw/spapr_vty.c
index afc9ef9..5c2412a 100644
--- a/hw/spapr_vty.c
+++ b/hw/spapr_vty.c
@@ -24,6 +24,10 @@ static void vty_receive(void *opaque, const uint8_t *buf, int size)
     VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;
     int i;
 
+    if ((dev->in == dev->out) && size) {
+        /* toggle line to simulate edge interrupt */
+        qemu_irq_pulse(dev->sdev.qirq);
+    }
     for (i = 0; i < size; i++) {
         assert((dev->in - dev->out) < VTERM_BUFSIZE);
         dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i];
@@ -107,14 +111,19 @@ static target_ulong h_get_term_char(CPUState *env, sPAPREnvironment *spapr,
 }
 
 void spapr_vty_create(VIOsPAPRBus *bus,
-                      uint32_t reg, CharDriverState *chardev)
+                      uint32_t reg, CharDriverState *chardev,
+                      qemu_irq qirq, uint32_t vio_irq_num)
 {
     DeviceState *dev;
+    VIOsPAPRDevice *sdev;
 
     dev = qdev_create(&bus->bus, "spapr-vty");
     qdev_prop_set_uint32(dev, "reg", reg);
     qdev_prop_set_chr(dev, "chardev", chardev);
     qdev_init_nofail(dev);
+    sdev = (VIOsPAPRDevice *)dev;
+    sdev->qirq = qirq;
+    sdev->vio_irq_num = vio_irq_num;
 }
 
 static void vty_hcalls(VIOsPAPRBus *bus)
-- 
1.7.1