540 lines
16 KiB
C
540 lines
16 KiB
C
/*
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* SCLP
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* Event Facility
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* handles SCLP event types
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* - Signal Quiesce - system power down
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* - ASCII Console Data - VT220 read and write
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Heinz Graalfs <graalfs@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at your
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* option) any later version. See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "hw/s390x/sclp.h"
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#include "migration/vmstate.h"
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#include "hw/s390x/event-facility.h"
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typedef struct SCLPEventsBus {
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BusState qbus;
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} SCLPEventsBus;
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/* we need to save 32 bit chunks for compatibility */
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#if HOST_BIG_ENDIAN
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#define RECV_MASK_LOWER 1
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#define RECV_MASK_UPPER 0
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#else /* little endian host */
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#define RECV_MASK_LOWER 0
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#define RECV_MASK_UPPER 1
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#endif
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struct SCLPEventFacility {
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SysBusDevice parent_obj;
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SCLPEventsBus sbus;
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SCLPEvent quiesce, cpu_hotplug;
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/* guest's receive mask */
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union {
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uint32_t receive_mask_pieces[2];
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sccb_mask_t receive_mask;
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};
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/*
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* when false, we keep the same broken, backwards compatible behaviour as
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* before, allowing only masks of size exactly 4; when true, we implement
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* the architecture correctly, allowing all valid mask sizes. Needed for
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* migration toward older versions.
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*/
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bool allow_all_mask_sizes;
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/* length of the receive mask */
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uint16_t mask_length;
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};
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/* return true if any child has event pending set */
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static bool event_pending(SCLPEventFacility *ef)
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{
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BusChild *kid;
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SCLPEvent *event;
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SCLPEventClass *event_class;
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QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
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DeviceState *qdev = kid->child;
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event = DO_UPCAST(SCLPEvent, qdev, qdev);
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event_class = SCLP_EVENT_GET_CLASS(event);
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if (event->event_pending &&
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event_class->get_send_mask() & ef->receive_mask) {
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return true;
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}
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}
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return false;
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}
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static sccb_mask_t get_host_send_mask(SCLPEventFacility *ef)
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{
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sccb_mask_t mask;
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BusChild *kid;
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SCLPEventClass *child;
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mask = 0;
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QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
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DeviceState *qdev = kid->child;
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child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
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mask |= child->get_send_mask();
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}
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return mask;
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}
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static sccb_mask_t get_host_receive_mask(SCLPEventFacility *ef)
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{
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sccb_mask_t mask;
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BusChild *kid;
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SCLPEventClass *child;
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mask = 0;
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QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
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DeviceState *qdev = kid->child;
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child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
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mask |= child->get_receive_mask();
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}
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return mask;
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}
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static uint16_t write_event_length_check(SCCB *sccb)
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{
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int slen;
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unsigned elen = 0;
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EventBufferHeader *event;
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WriteEventData *wed = (WriteEventData *) sccb;
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event = (EventBufferHeader *) &wed->ebh;
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for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
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elen = be16_to_cpu(event->length);
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if (elen < sizeof(*event) || elen > slen) {
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return SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR;
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}
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event = (void *) event + elen;
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}
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if (slen) {
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return SCLP_RC_INCONSISTENT_LENGTHS;
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}
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return SCLP_RC_NORMAL_COMPLETION;
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}
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static uint16_t handle_write_event_buf(SCLPEventFacility *ef,
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EventBufferHeader *event_buf, SCCB *sccb)
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{
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uint16_t rc;
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BusChild *kid;
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SCLPEvent *event;
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SCLPEventClass *ec;
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rc = SCLP_RC_INVALID_FUNCTION;
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QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
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DeviceState *qdev = kid->child;
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event = (SCLPEvent *) qdev;
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ec = SCLP_EVENT_GET_CLASS(event);
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if (ec->write_event_data &&
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ec->can_handle_event(event_buf->type)) {
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rc = ec->write_event_data(event, event_buf);
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break;
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}
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}
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return rc;
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}
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static uint16_t handle_sccb_write_events(SCLPEventFacility *ef, SCCB *sccb)
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{
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uint16_t rc;
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int slen;
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unsigned elen = 0;
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EventBufferHeader *event_buf;
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WriteEventData *wed = (WriteEventData *) sccb;
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event_buf = &wed->ebh;
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rc = SCLP_RC_NORMAL_COMPLETION;
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/* loop over all contained event buffers */
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for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
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elen = be16_to_cpu(event_buf->length);
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/* in case of a previous error mark all trailing buffers
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* as not accepted */
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if (rc != SCLP_RC_NORMAL_COMPLETION) {
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event_buf->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
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} else {
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rc = handle_write_event_buf(ef, event_buf, sccb);
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}
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event_buf = (void *) event_buf + elen;
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}
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return rc;
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}
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static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
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{
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if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
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sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
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return;
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}
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if (be16_to_cpu(sccb->h.length) < 8) {
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sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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return;
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}
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/* first do a sanity check of the write events */
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sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));
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/* if no early error, then execute */
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if (sccb->h.response_code == be16_to_cpu(SCLP_RC_NORMAL_COMPLETION)) {
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sccb->h.response_code =
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cpu_to_be16(handle_sccb_write_events(ef, sccb));
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}
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}
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static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb,
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sccb_mask_t mask)
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{
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uint16_t rc;
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int slen;
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unsigned elen;
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BusChild *kid;
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SCLPEvent *event;
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SCLPEventClass *ec;
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EventBufferHeader *event_buf;
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ReadEventData *red = (ReadEventData *) sccb;
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event_buf = &red->ebh;
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event_buf->length = 0;
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slen = sccb_data_len(sccb);
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rc = SCLP_RC_NO_EVENT_BUFFERS_STORED;
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QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
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DeviceState *qdev = kid->child;
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event = (SCLPEvent *) qdev;
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ec = SCLP_EVENT_GET_CLASS(event);
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if (mask & ec->get_send_mask()) {
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if (ec->read_event_data(event, event_buf, &slen)) {
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elen = be16_to_cpu(event_buf->length);
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event_buf = (EventBufferHeader *) ((char *)event_buf + elen);
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rc = SCLP_RC_NORMAL_COMPLETION;
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}
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}
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}
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if (sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {
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/* architecture suggests to reset variable-length-response bit */
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sccb->h.control_mask[2] &= ~SCLP_VARIABLE_LENGTH_RESPONSE;
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/* with a new length value */
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sccb->h.length = cpu_to_be16(SCCB_SIZE - slen);
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}
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return rc;
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}
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/* copy up to src_len bytes and fill the rest of dst with zeroes */
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static void copy_mask(uint8_t *dst, uint8_t *src, uint16_t dst_len,
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uint16_t src_len)
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{
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int i;
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for (i = 0; i < dst_len; i++) {
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dst[i] = i < src_len ? src[i] : 0;
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}
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}
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static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
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{
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sccb_mask_t sclp_active_selection_mask;
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sccb_mask_t sclp_cp_receive_mask;
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ReadEventData *red = (ReadEventData *) sccb;
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if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
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sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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return;
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}
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switch (sccb->h.function_code) {
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case SCLP_UNCONDITIONAL_READ:
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sccb->h.response_code = cpu_to_be16(
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handle_sccb_read_events(ef, sccb, ef->receive_mask));
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break;
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case SCLP_SELECTIVE_READ:
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/* get active selection mask */
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sclp_cp_receive_mask = ef->receive_mask;
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copy_mask((uint8_t *)&sclp_active_selection_mask, (uint8_t *)&red->mask,
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sizeof(sclp_active_selection_mask), ef->mask_length);
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sclp_active_selection_mask = be64_to_cpu(sclp_active_selection_mask);
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if (!sclp_cp_receive_mask ||
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(sclp_active_selection_mask & ~sclp_cp_receive_mask)) {
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sccb->h.response_code =
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cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
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} else {
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sccb->h.response_code = cpu_to_be16(
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handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));
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}
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break;
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default:
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sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
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}
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}
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static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
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{
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WriteEventMask *we_mask = (WriteEventMask *) sccb;
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uint16_t mask_length = be16_to_cpu(we_mask->mask_length);
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sccb_mask_t tmp_mask;
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if (!mask_length || (mask_length > SCLP_EVENT_MASK_LEN_MAX) ||
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((mask_length != 4) && !ef->allow_all_mask_sizes)) {
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sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
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return;
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}
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/*
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* Note: We currently only support masks up to 8 byte length;
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* the remainder is filled up with zeroes. Older Linux
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* kernels use a 4 byte mask length, newer ones can use both
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* 8 or 4 depending on what is available on the host.
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*/
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/* keep track of the guest's capability masks */
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copy_mask((uint8_t *)&tmp_mask, WEM_CP_RECEIVE_MASK(we_mask, mask_length),
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sizeof(tmp_mask), mask_length);
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ef->receive_mask = be64_to_cpu(tmp_mask);
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/* return the SCLP's capability masks to the guest */
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tmp_mask = cpu_to_be64(get_host_receive_mask(ef));
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copy_mask(WEM_RECEIVE_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask,
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mask_length, sizeof(tmp_mask));
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tmp_mask = cpu_to_be64(get_host_send_mask(ef));
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copy_mask(WEM_SEND_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask,
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mask_length, sizeof(tmp_mask));
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sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
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ef->mask_length = mask_length;
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}
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/* qemu object creation and initialization functions */
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#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"
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static const TypeInfo sclp_events_bus_info = {
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.name = TYPE_SCLP_EVENTS_BUS,
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.parent = TYPE_BUS,
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};
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static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code)
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{
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switch (code & SCLP_CMD_CODE_MASK) {
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case SCLP_CMD_READ_EVENT_DATA:
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read_event_data(ef, sccb);
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break;
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case SCLP_CMD_WRITE_EVENT_DATA:
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write_event_data(ef, sccb);
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break;
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case SCLP_CMD_WRITE_EVENT_MASK:
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write_event_mask(ef, sccb);
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break;
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}
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}
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static bool vmstate_event_facility_mask64_needed(void *opaque)
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{
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SCLPEventFacility *ef = opaque;
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return (ef->receive_mask & 0xFFFFFFFF) != 0;
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}
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static bool vmstate_event_facility_mask_length_needed(void *opaque)
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{
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SCLPEventFacility *ef = opaque;
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return ef->allow_all_mask_sizes;
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}
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static const VMStateDescription vmstate_event_facility_mask64 = {
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.name = "vmstate-event-facility/mask64",
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.version_id = 0,
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.minimum_version_id = 0,
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.needed = vmstate_event_facility_mask64_needed,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(receive_mask_pieces[RECV_MASK_LOWER], SCLPEventFacility),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_event_facility_mask_length = {
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.name = "vmstate-event-facility/mask_length",
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.version_id = 0,
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.minimum_version_id = 0,
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.needed = vmstate_event_facility_mask_length_needed,
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.fields = (VMStateField[]) {
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VMSTATE_UINT16(mask_length, SCLPEventFacility),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_event_facility = {
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.name = "vmstate-event-facility",
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(receive_mask_pieces[RECV_MASK_UPPER], SCLPEventFacility),
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VMSTATE_END_OF_LIST()
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},
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.subsections = (const VMStateDescription * []) {
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&vmstate_event_facility_mask64,
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&vmstate_event_facility_mask_length,
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NULL
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}
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};
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static void sclp_event_set_allow_all_mask_sizes(Object *obj, bool value,
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Error **errp)
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{
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SCLPEventFacility *ef = (SCLPEventFacility *)obj;
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ef->allow_all_mask_sizes = value;
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}
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static bool sclp_event_get_allow_all_mask_sizes(Object *obj, Error **errp)
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{
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SCLPEventFacility *ef = (SCLPEventFacility *)obj;
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return ef->allow_all_mask_sizes;
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}
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static void init_event_facility(Object *obj)
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{
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SCLPEventFacility *event_facility = EVENT_FACILITY(obj);
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DeviceState *sdev = DEVICE(obj);
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event_facility->mask_length = 4;
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event_facility->allow_all_mask_sizes = true;
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object_property_add_bool(obj, "allow_all_mask_sizes",
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sclp_event_get_allow_all_mask_sizes,
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sclp_event_set_allow_all_mask_sizes);
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/* Spawn a new bus for SCLP events */
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qbus_init(&event_facility->sbus, sizeof(event_facility->sbus),
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TYPE_SCLP_EVENTS_BUS, sdev, NULL);
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object_initialize_child(obj, TYPE_SCLP_QUIESCE,
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&event_facility->quiesce,
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TYPE_SCLP_QUIESCE);
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object_initialize_child(obj, TYPE_SCLP_CPU_HOTPLUG,
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&event_facility->cpu_hotplug,
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TYPE_SCLP_CPU_HOTPLUG);
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}
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static void realize_event_facility(DeviceState *dev, Error **errp)
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{
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SCLPEventFacility *event_facility = EVENT_FACILITY(dev);
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if (!qdev_realize(DEVICE(&event_facility->quiesce),
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BUS(&event_facility->sbus), errp)) {
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return;
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}
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if (!qdev_realize(DEVICE(&event_facility->cpu_hotplug),
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BUS(&event_facility->sbus), errp)) {
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qdev_unrealize(DEVICE(&event_facility->quiesce));
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return;
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}
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}
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static void reset_event_facility(DeviceState *dev)
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{
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SCLPEventFacility *sdev = EVENT_FACILITY(dev);
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sdev->receive_mask = 0;
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}
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static void init_event_facility_class(ObjectClass *klass, void *data)
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{
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SysBusDeviceClass *sbdc = SYS_BUS_DEVICE_CLASS(klass);
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DeviceClass *dc = DEVICE_CLASS(sbdc);
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SCLPEventFacilityClass *k = EVENT_FACILITY_CLASS(dc);
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dc->realize = realize_event_facility;
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dc->reset = reset_event_facility;
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dc->vmsd = &vmstate_event_facility;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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k->command_handler = command_handler;
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k->event_pending = event_pending;
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}
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static const TypeInfo sclp_event_facility_info = {
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.name = TYPE_SCLP_EVENT_FACILITY,
|
|
.parent = TYPE_SYS_BUS_DEVICE,
|
|
.instance_init = init_event_facility,
|
|
.instance_size = sizeof(SCLPEventFacility),
|
|
.class_init = init_event_facility_class,
|
|
.class_size = sizeof(SCLPEventFacilityClass),
|
|
};
|
|
|
|
static void event_realize(DeviceState *qdev, Error **errp)
|
|
{
|
|
SCLPEvent *event = SCLP_EVENT(qdev);
|
|
SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
|
|
|
|
if (child->init) {
|
|
int rc = child->init(event);
|
|
if (rc < 0) {
|
|
error_setg(errp, "SCLP event initialization failed.");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void event_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
dc->bus_type = TYPE_SCLP_EVENTS_BUS;
|
|
dc->realize = event_realize;
|
|
}
|
|
|
|
static const TypeInfo 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(&sclp_events_bus_info);
|
|
type_register_static(&sclp_event_facility_info);
|
|
type_register_static(&sclp_event_type_info);
|
|
}
|
|
|
|
type_init(register_types)
|
|
|
|
BusState *sclp_get_event_facility_bus(void)
|
|
{
|
|
Object *busobj;
|
|
SCLPEventsBus *sbus;
|
|
|
|
busobj = object_resolve_path_type("", TYPE_SCLP_EVENTS_BUS, NULL);
|
|
sbus = OBJECT_CHECK(SCLPEventsBus, busobj, TYPE_SCLP_EVENTS_BUS);
|
|
if (!sbus) {
|
|
return NULL;
|
|
}
|
|
|
|
return &sbus->qbus;
|
|
}
|