1 files changed, 391 insertions, 0 deletions
diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c
new file mode 100644
index 0000000000..1108e2d246
--- /dev/null
+++ b/hw/s390x/event-facility.c
@@ -0,0 +1,391 @@
+/*
+ * SCLP
+ *    Event Facility
+ *       handles SCLP event types
+ *          - Signal Quiesce - system power down
+ *          - ASCII Console Data - VT220 read and write
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Heinz Graalfs <graalfs@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version.  See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "monitor.h"
+#include "sysemu.h"
+
+#include "sclp.h"
+#include "event-facility.h"
+
+typedef struct EventTypesBus {
+    BusState qbus;
+} EventTypesBus;
+
+struct SCLPEventFacility {
+    EventTypesBus sbus;
+    DeviceState *qdev;
+    /* guest' receive mask */
+    unsigned int receive_mask;
+};
+
+/* return true if any child has event pending set */
+static bool event_pending(SCLPEventFacility *ef)
+{
+    BusChild *kid;
+    SCLPEvent *event;
+    SCLPEventClass *event_class;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        event = DO_UPCAST(SCLPEvent, qdev, qdev);
+        event_class = SCLP_EVENT_GET_CLASS(event);
+        if (event->event_pending &&
+            event_class->get_send_mask() & ef->receive_mask) {
+            return true;
+        }
+    }
+    return false;
+}
+
+static unsigned int get_host_send_mask(SCLPEventFacility *ef)
+{
+    unsigned int mask;
+    BusChild *kid;
+    SCLPEventClass *child;
+
+    mask = 0;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
+        mask |= child->get_send_mask();
+    }
+    return mask;
+}
+
+static unsigned int get_host_receive_mask(SCLPEventFacility *ef)
+{
+    unsigned int mask;
+    BusChild *kid;
+    SCLPEventClass *child;
+
+    mask = 0;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
+        mask |= child->get_receive_mask();
+    }
+    return mask;
+}
+
+static uint16_t write_event_length_check(SCCB *sccb)
+{
+    int slen;
+    unsigned elen = 0;
+    EventBufferHeader *event;
+    WriteEventData *wed = (WriteEventData *) sccb;
+
+    event = (EventBufferHeader *) &wed->ebh;
+    for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
+        elen = be16_to_cpu(event->length);
+        if (elen < sizeof(*event) || elen > slen) {
+            return SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR;
+        }
+        event = (void *) event + elen;
+    }
+    if (slen) {
+        return SCLP_RC_INCONSISTENT_LENGTHS;
+    }
+    return SCLP_RC_NORMAL_COMPLETION;
+}
+
+static uint16_t handle_write_event_buf(SCLPEventFacility *ef,
+                                       EventBufferHeader *event_buf, SCCB *sccb)
+{
+    uint16_t rc;
+    BusChild *kid;
+    SCLPEvent *event;
+    SCLPEventClass *ec;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        event = (SCLPEvent *) qdev;
+        ec = SCLP_EVENT_GET_CLASS(event);
+
+        rc = SCLP_RC_INVALID_FUNCTION;
+        if (ec->write_event_data &&
+            ec->event_type() == event_buf->type) {
+            rc = ec->write_event_data(event, event_buf);
+            break;
+        }
+    }
+    return rc;
+}
+
+static uint16_t handle_sccb_write_events(SCLPEventFacility *ef, SCCB *sccb)
+{
+    uint16_t rc;
+    int slen;
+    unsigned elen = 0;
+    EventBufferHeader *event_buf;
+    WriteEventData *wed = (WriteEventData *) sccb;
+
+    event_buf = &wed->ebh;
+    rc = SCLP_RC_NORMAL_COMPLETION;
+
+    /* loop over all contained event buffers */
+    for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
+        elen = be16_to_cpu(event_buf->length);
+
+        /* in case of a previous error mark all trailing buffers
+         * as not accepted */
+        if (rc != SCLP_RC_NORMAL_COMPLETION) {
+            event_buf->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
+        } else {
+            rc = handle_write_event_buf(ef, event_buf, sccb);
+        }
+        event_buf = (void *) event_buf + elen;
+    }
+    return rc;
+}
+
+static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
+{
+    if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
+        goto out;
+    }
+    if (be16_to_cpu(sccb->h.length) < 8) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
+        goto out;
+    }
+    /* first do a sanity check of the write events */
+    sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));
+
+    /* if no early error, then execute */
+    if (sccb->h.response_code == be16_to_cpu(SCLP_RC_NORMAL_COMPLETION)) {
+        sccb->h.response_code =
+                cpu_to_be16(handle_sccb_write_events(ef, sccb));
+    }
+
+out:
+    return;
+}
+
+static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb,
+                                        unsigned int mask)
+{
+    uint16_t rc;
+    int slen;
+    unsigned elen = 0;
+    BusChild *kid;
+    SCLPEvent *event;
+    SCLPEventClass *ec;
+    EventBufferHeader *event_buf;
+    ReadEventData *red = (ReadEventData *) sccb;
+
+    event_buf = &red->ebh;
+    event_buf->length = 0;
+    slen = sizeof(sccb->data);
+
+    rc = SCLP_RC_NO_EVENT_BUFFERS_STORED;
+
+    QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        event = (SCLPEvent *) qdev;
+        ec = SCLP_EVENT_GET_CLASS(event);
+
+        if (mask & ec->get_send_mask()) {
+            if (ec->read_event_data(event, event_buf, &slen)) {
+                rc = SCLP_RC_NORMAL_COMPLETION;
+            }
+        }
+        elen = be16_to_cpu(event_buf->length);
+        event_buf = (void *) event_buf + elen;
+    }
+
+    if (sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {
+        /* architecture suggests to reset variable-length-response bit */
+        sccb->h.control_mask[2] &= ~SCLP_VARIABLE_LENGTH_RESPONSE;
+        /* with a new length value */
+        sccb->h.length = cpu_to_be16(SCCB_SIZE - slen);
+    }
+    return rc;
+}
+
+static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
+{
+    unsigned int sclp_active_selection_mask;
+    unsigned int sclp_cp_receive_mask;
+
+    ReadEventData *red = (ReadEventData *) sccb;
+
+    if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
+        goto out;
+    }
+
+    sclp_cp_receive_mask = ef->receive_mask;
+
+    /* get active selection mask */
+    switch (sccb->h.function_code) {
+    case SCLP_UNCONDITIONAL_READ:
+        sclp_active_selection_mask = sclp_cp_receive_mask;
+        break;
+    case SCLP_SELECTIVE_READ:
+        if (!(sclp_cp_receive_mask & be32_to_cpu(red->mask))) {
+            sccb->h.response_code =
+                    cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
+            goto out;
+        }
+        sclp_active_selection_mask = be32_to_cpu(red->mask);
+        break;
+    default:
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
+        goto out;
+    }
+    sccb->h.response_code = cpu_to_be16(
+            handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));
+
+out:
+    return;
+}
+
+static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
+{
+    WriteEventMask *we_mask = (WriteEventMask *) sccb;
+
+    /* Attention: We assume that Linux uses 4-byte masks, what it actually
+       does. Architecture allows for masks of variable size, though */
+    if (be16_to_cpu(we_mask->mask_length) != 4) {
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
+        goto out;
+    }
+
+    /* keep track of the guest's capability masks */
+    ef->receive_mask = be32_to_cpu(we_mask->cp_receive_mask);
+
+    /* return the SCLP's capability masks to the guest */
+    we_mask->send_mask = cpu_to_be32(get_host_send_mask(ef));
+    we_mask->receive_mask = cpu_to_be32(get_host_receive_mask(ef));
+
+    sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
+
+out:
+    return;
+}
+
+/* qemu object creation and initialization functions */
+
+#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"
+
+static void sclp_events_bus_class_init(ObjectClass *klass, void *data)
+{
+}
+
+static const TypeInfo s390_sclp_events_bus_info = {
+    .name = TYPE_SCLP_EVENTS_BUS,
+    .parent = TYPE_BUS,
+    .class_init = sclp_events_bus_class_init,
+};
+
+static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code)
+{
+    switch (code) {
+    case SCLP_CMD_READ_EVENT_DATA:
+        read_event_data(ef, sccb);
+        break;
+    case SCLP_CMD_WRITE_EVENT_DATA:
+        write_event_data(ef, sccb);
+        break;
+    case SCLP_CMD_WRITE_EVENT_MASK:
+        write_event_mask(ef, sccb);
+        break;
+    default:
+        sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
+        break;
+    }
+}
+
+static int init_event_facility(S390SCLPDevice *sdev)
+{
+    SCLPEventFacility *event_facility;
+
+    event_facility = g_malloc0(sizeof(SCLPEventFacility));
+    sdev->ef = event_facility;
+    sdev->sclp_command_handler = command_handler;
+    sdev->event_pending = event_pending;
+
+    /* Spawn a new sclp-events facility */
+    qbus_create_inplace(&event_facility->sbus.qbus,
+                        TYPE_SCLP_EVENTS_BUS, (DeviceState *)sdev, NULL);
+    event_facility->sbus.qbus.allow_hotplug = 0;
+    event_facility->qdev = (DeviceState *) sdev;
+
+    return 0;
+}
+
+static void init_event_facility_class(ObjectClass *klass, void *data)
+{
+    S390SCLPDeviceClass *k = SCLP_S390_DEVICE_CLASS(klass);
+
+    k->init = init_event_facility;
+}
+
+static TypeInfo s390_sclp_event_facility_info = {
+    .name          = "s390-sclp-event-facility",
+    .parent        = TYPE_DEVICE_S390_SCLP,
+    .instance_size = sizeof(S390SCLPDevice),
+    .class_init    = init_event_facility_class,
+};
+
+static int event_qdev_init(DeviceState *qdev)
+{
+    SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
+    SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
+
+    return child->init(event);
+}
+
+static int event_qdev_exit(DeviceState *qdev)
+{
+    SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
+    SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
+    if (child->exit) {
+        child->exit(event);
+    }
+    return 0;
+}
+
+static void event_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->bus_type = TYPE_SCLP_EVENTS_BUS;
+    dc->unplug = qdev_simple_unplug_cb;
+    dc->init = event_qdev_init;
+    dc->exit = event_qdev_exit;
+}
+
+static TypeInfo s390_sclp_event_type_info = {
+    .name = TYPE_SCLP_EVENT,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(SCLPEvent),
+    .class_init = event_class_init,
+    .class_size = sizeof(SCLPEventClass),
+    .abstract = true,
+};
+
+static void register_types(void)
+{
+    type_register_static(&s390_sclp_events_bus_info);
+    type_register_static(&s390_sclp_event_facility_info);
+    type_register_static(&s390_sclp_event_type_info);
+}
+
+type_init(register_types)