[Qemu-devel] [PATCH V5 09/18] virtio-ccw: introduce ccw specific queue limit

[Jason Wang <jasowang@redhat.com>]

Instead of depending on marco, using a bus specific limit. Also make
it clear that the number of gsis per I/O adapter is not directly
depending on the number of virtio queues, but rather the other way
around.

Cc: Alexander Graf <agraf@suse.de>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/s390x/s390-virtio-ccw.c   |  7 +++++--
 hw/s390x/virtio-ccw.c        | 19 ++++++++++++-------
 include/hw/s390x/s390_flic.h |  4 +++-
 3 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index afb539a..96b84ab 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -55,6 +55,7 @@ void io_subsystem_reset(void)
 
 static int virtio_ccw_hcall_notify(const uint64_t *args)
 {
+    VirtIODevice *vdev;
     uint64_t subch_id = args[0];
     uint64_t queue = args[1];
     SubchDev *sch;
@@ -67,10 +68,12 @@ static int virtio_ccw_hcall_notify(const uint64_t *args)
     if (!sch || !css_subch_visible(sch)) {
         return -EINVAL;
     }
-    if (queue >= VIRTIO_PCI_QUEUE_MAX) {
+
+    vdev = virtio_ccw_get_vdev(sch);
+    if (queue >= virtio_get_queue_max(vdev)) {
         return -EINVAL;
     }
-    virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
+    virtio_queue_notify(vdev, queue);
     return 0;
 
 }
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index dfe6ded..935b880 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -32,6 +32,8 @@
 static QTAILQ_HEAD(, IndAddr) indicator_addresses =
     QTAILQ_HEAD_INITIALIZER(indicator_addresses);
 
+#define VIRTIO_CCW_QUEUE_MAX ADAPTER_ROUTES_MAX_GSI
+
 static IndAddr *get_indicator(hwaddr ind_addr, int len)
 {
     IndAddr *indicator;
@@ -170,7 +172,7 @@ static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev)
         return;
     }
     vdev = virtio_bus_get_device(&dev->bus);
-    for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
+    for (n = 0; n < virtio_get_queue_max(vdev); n++) {
         if (!virtio_queue_get_num(vdev, n)) {
             continue;
         }
@@ -205,7 +207,7 @@ static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
         return;
     }
     vdev = virtio_bus_get_device(&dev->bus);
-    for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
+    for (n = 0; n < virtio_get_queue_max(vdev); n++) {
         if (!virtio_queue_get_num(vdev, n)) {
             continue;
         }
@@ -265,8 +267,9 @@ static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint32_t align,
                               uint16_t index, uint16_t num)
 {
     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
+    int queue_max = virtio_get_queue_max(vdev);
 
-    if (index > VIRTIO_PCI_QUEUE_MAX) {
+    if (index > queue_max) {
         return -EINVAL;
     }
 
@@ -291,7 +294,7 @@ static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint32_t align,
         virtio_queue_set_vector(vdev, index, index);
     }
     /* tell notify handler in case of config change */
-    vdev->config_vector = VIRTIO_PCI_QUEUE_MAX;
+    vdev->config_vector = queue_max;
     return 0;
 }
 
@@ -1036,14 +1039,16 @@ static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
 static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
 {
     VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d);
+    VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
     SubchDev *sch = dev->sch;
     uint64_t indicators;
 
-    if (vector >= 128) {
+    /* queue indicators + secondary indicators */
+    if (vector >= virtio_get_queue_max(vdev) + 64) {
         return;
     }
 
-    if (vector < VIRTIO_PCI_QUEUE_MAX) {
+    if (vector < virtio_get_queue_max(vdev)) {
         if (!dev->indicators) {
             return;
         }
@@ -1711,7 +1716,7 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
     k->load_queue = virtio_ccw_load_queue;
     k->save_config = virtio_ccw_save_config;
     k->load_config = virtio_ccw_load_config;
-    k->queue_max = VIRTIO_PCI_QUEUE_MAX;
+    k->queue_max = VIRTIO_CCW_QUEUE_MAX;
 }
 
 static const TypeInfo virtio_ccw_bus_info = {
diff --git a/include/hw/s390x/s390_flic.h b/include/hw/s390x/s390_flic.h
index 489d73b..e1b0389 100644
--- a/include/hw/s390x/s390_flic.h
+++ b/include/hw/s390x/s390_flic.h
@@ -17,10 +17,12 @@
 #include "hw/s390x/adapter.h"
 #include "hw/virtio/virtio.h"
 
+#define ADAPTER_ROUTES_MAX_GSI 64
+
 typedef struct AdapterRoutes {
     AdapterInfo adapter;
     int num_routes;
-    int gsi[VIRTIO_PCI_QUEUE_MAX];
+    int gsi[ADAPTER_ROUTES_MAX_GSI];
 } AdapterRoutes;
 
 #define TYPE_S390_FLIC_COMMON "s390-flic"
-- 
2.1.0