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-rw-r--r--hw/s390x/event-facility.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c
new file mode 100644
index 0000000000..93676602a7
--- /dev/null
+++ b/hw/s390x/event-facility.c
@@ -0,0 +1,398 @@
+/*
+ * 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;
+ DeviceState *quiesce;
+
+ 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;
+
+ quiesce = qdev_create(&event_facility->sbus.qbus, "sclpquiesce");
+ if (!quiesce) {
+ return -1;
+ }
+ qdev_init_nofail(quiesce);
+
+ 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)
generated by cgit v1.2.1 (git 2.18.0) at 2024-05-24 17:40:08 +0000