Fixes for s390x in the css area.

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Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20160720' into staging

Fixes for s390x in the css area.

# gpg: Signature made Wed 20 Jul 2016 15:12:43 BST
# gpg:                using RSA key 0xDECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20160720:
  s390x/css: provide a dev_path for css devices
  s390x/css: sch_handle_start_func() handles resume, too
  s390x/css: copy CCW format bit from ORB to SCSW

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/s390x/css-bridge.c

@@ -59,11 +59,28 @@ static void virtual_css_bus_reset(BusState *qbus)
     css_reset();
 }
 
+static char *virtual_css_bus_get_dev_path(DeviceState *dev)
+{
+    CcwDevice *ccw_dev = CCW_DEVICE(dev);
+    SubchDev *sch = ccw_dev->sch;
+    VirtualCssBridge *bridge =
+        VIRTUAL_CSS_BRIDGE(qdev_get_parent_bus(dev)->parent);
+
+    /*
+     * We can't provide a dev path for backward compatibility on
+     * older machines, as it is visible in the migration stream.
+     */
+    return bridge->css_dev_path ?
+        g_strdup_printf("/%02x.%1x.%04x", sch->cssid, sch->ssid, sch->devno) :
+        NULL;
+}
+
 static void virtual_css_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
 
     k->reset = virtual_css_bus_reset;
+    k->get_dev_path = virtual_css_bus_get_dev_path;
 }
 
 static const TypeInfo virtual_css_bus_info = {
@@ -95,6 +112,12 @@ VirtualCssBus *virtual_css_bus_init(void)
 
 /***************** Virtual-css Bus Bridge Device ********************/
 
+static Property virtual_css_bridge_properties[] = {
+    DEFINE_PROP_BOOL("css_dev_path", VirtualCssBridge, css_dev_path,
+                     true),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
 {
     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
@@ -102,12 +125,13 @@ static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
 
     hc->unplug = ccw_device_unplug;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+    dc->props = virtual_css_bridge_properties;
 }
 
 static const TypeInfo virtual_css_bridge_info = {
     .name          = TYPE_VIRTUAL_CSS_BRIDGE,
     .parent        = TYPE_SYS_BUS_DEVICE,
-    .instance_size = sizeof(SysBusDevice),
+    .instance_size = sizeof(VirtualCssBridge),
     .class_init    = virtual_css_bridge_class_init,
     .interfaces = (InterfaceInfo[]) {
         { TYPE_HOTPLUG_HANDLER },

hw/s390x/css.c

@@ -511,6 +511,7 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
     path = 0x80;
 
     if (!(s->ctrl & SCSW_ACTL_SUSP)) {
+        /* Start Function triggered via ssch, i.e. we have an ORB */
         s->cstat = 0;
         s->dstat = 0;
         /* Look at the orb and try to execute the channel program. */
@@ -524,9 +525,12 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
             return;
         }
         sch->ccw_fmt_1 = !!(orb->ctrl0 & ORB_CTRL0_MASK_FMT);
+        s->flags |= (sch->ccw_fmt_1) ? SCSW_FLAGS_MASK_FMT : 0;
         sch->ccw_no_data_cnt = 0;
         suspend_allowed = !!(orb->ctrl0 & ORB_CTRL0_MASK_SPND);
     } else {
+        /* Start Function resumed via rsch, i.e. we don't have an
+         * ORB */
         s->ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND);
         /* The channel program had been suspended before. */
         suspend_allowed = true;
@@ -609,6 +613,7 @@ static void do_subchannel_work(SubchDev *sch, ORB *orb)
     } else if (s->ctrl & SCSW_FCTL_HALT_FUNC) {
         sch_handle_halt_func(sch);
     } else if (s->ctrl & SCSW_FCTL_START_FUNC) {
+        /* Triggered by both ssch and rsch. */
         sch_handle_start_func(sch, orb);
     } else {
         /* Cannot happen. */

hw/s390x/s390-virtio-ccw.c

@@ -322,6 +322,10 @@ static const TypeInfo ccw_machine_info = {
             .driver   = TYPE_S390_IPL,\
             .property = "iplbext_migration",\
             .value    = "off",\
+        }, {\
+            .driver   = TYPE_VIRTUAL_CSS_BRIDGE,\
+            .property = "css_dev_path",\
+            .value    = "off",\
         },
 
 #define CCW_COMPAT_2_5 \

include/hw/s390x/css-bridge.h

@@ -16,7 +16,14 @@
 #include "hw/qdev-core.h"
 
 /* virtual css bridge */
+typedef struct VirtualCssBridge {
+    SysBusDevice sysbus_dev;
+    bool css_dev_path;
+} VirtualCssBridge;
+
 #define TYPE_VIRTUAL_CSS_BRIDGE "virtual-css-bridge"
+#define VIRTUAL_CSS_BRIDGE(obj) \
+    OBJECT_CHECK(VirtualCssBridge, (obj), TYPE_VIRTUAL_CSS_BRIDGE)
 
 /* virtual css bus type */
 typedef struct VirtualCssBus {