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/*
* Emulated ccw-attached 3270 implementation
*
* Copyright 2017 IBM Corp.
* Author(s): Yang Chen <bjcyang@linux.vnet.ibm.com>
* Jing Liu <liujbjl@linux.vnet.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 "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "cpu.h"
#include "hw/s390x/css.h"
#include "hw/s390x/css-bridge.h"
#include "hw/s390x/3270-ccw.h"
/* Handle READ ccw commands from guest */
static int handle_payload_3270_read(EmulatedCcw3270Device *dev, CCW1 *ccw)
{
EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
CcwDevice *ccw_dev = CCW_DEVICE(dev);
int len;
if (!ccw->cda) {
return -EFAULT;
}
len = ck->read_payload_3270(dev, ccw->cda, ccw->count);
ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
return 0;
}
/* Handle WRITE ccw commands to write data to client */
static int handle_payload_3270_write(EmulatedCcw3270Device *dev, CCW1 *ccw)
{
EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
CcwDevice *ccw_dev = CCW_DEVICE(dev);
int len;
if (!ccw->cda) {
return -EFAULT;
}
len = ck->write_payload_3270(dev, ccw->cmd_code, ccw->cda, ccw->count);
if (len <= 0) {
return -EIO;
}
ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
return 0;
}
static int emulated_ccw_3270_cb(SubchDev *sch, CCW1 ccw)
{
int rc = 0;
EmulatedCcw3270Device *dev = sch->driver_data;
switch (ccw.cmd_code) {
case TC_WRITESF:
case TC_WRITE:
case TC_EWRITE:
case TC_EWRITEA:
rc = handle_payload_3270_write(dev, &ccw);
break;
case TC_RDBUF:
case TC_READMOD:
rc = handle_payload_3270_read(dev, &ccw);
break;
default:
rc = -ENOSYS;
break;
}
if (rc == -EIO) {
/* I/O error, specific devices generate specific conditions */
SCSW *s = &sch->curr_status.scsw;
sch->curr_status.scsw.dstat = SCSW_DSTAT_UNIT_CHECK;
sch->sense_data[0] = 0x40; /* intervention-req */
s->ctrl &= ~SCSW_ACTL_START_PEND;
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
}
return rc;
}
static void emulated_ccw_3270_realize(DeviceState *ds, Error **errp)
{
uint16_t chpid;
EmulatedCcw3270Device *dev = EMULATED_CCW_3270(ds);
EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
CcwDevice *cdev = CCW_DEVICE(ds);
CCWDeviceClass *cdk = CCW_DEVICE_GET_CLASS(cdev);
DeviceState *parent = DEVICE(cdev);
BusState *qbus = qdev_get_parent_bus(parent);
VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus);
SubchDev *sch;
Error *err = NULL;
sch = css_create_sch(cdev->devno, true, cbus->squash_mcss, errp);
if (!sch) {
return;
}
if (!ck->init) {
goto out_err;
}
sch->driver_data = dev;
cdev->sch = sch;
chpid = css_find_free_chpid(sch->cssid);
if (chpid > MAX_CHPID) {
error_setg(&err, "No available chpid to use.");
goto out_err;
}
sch->id.reserved = 0xff;
sch->id.cu_type = EMULATED_CCW_3270_CU_TYPE;
css_sch_build_virtual_schib(sch, (uint8_t)chpid,
EMULATED_CCW_3270_CHPID_TYPE);
sch->do_subchannel_work = do_subchannel_work_virtual;
sch->ccw_cb = emulated_ccw_3270_cb;
ck->init(dev, &err);
if (err) {
goto out_err;
}
cdk->realize(cdev, &err);
if (err) {
goto out_err;
}
return;
out_err:
error_propagate(errp, err);
css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
cdev->sch = NULL;
g_free(sch);
}
static Property emulated_ccw_3270_properties[] = {
DEFINE_PROP_END_OF_LIST(),
};
static void emulated_ccw_3270_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = emulated_ccw_3270_properties;
dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
dc->realize = emulated_ccw_3270_realize;
dc->hotpluggable = false;
}
static const TypeInfo emulated_ccw_3270_info = {
.name = TYPE_EMULATED_CCW_3270,
.parent = TYPE_CCW_DEVICE,
.instance_size = sizeof(EmulatedCcw3270Device),
.class_init = emulated_ccw_3270_class_init,
.class_size = sizeof(EmulatedCcw3270Class),
.abstract = true,
};
static void emulated_ccw_register(void)
{
type_register_static(&emulated_ccw_3270_info);
}
type_init(emulated_ccw_register)
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