qemu/hw/s390x/3270-ccw.c
Jing Liu 2dc95b4cac s390x/3270: 3270 data stream handling
This introduces the input and output handlers for 3270 device, setting
up the data tunnel among guest kernel, qemu and the 3270 client.

After the client connected and TN3270 handshake done, signal the not-ready
to ready status by an unsolicited device-end interrupt, and then the 3270
data stream could be handled correctly between the channel and socket.
Multiple commands generated by "Reset" key on x3270 are not supported now,
just simply terminate the connection.

Signed-off-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Signed-off-by: Yang Chen <bjcyang@linux.vnet.ibm.com>
Reviewed-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2017-05-04 10:34:37 +02:00

175 lines
4.4 KiB
C

/*
* 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);
SubchDev *sch = css_create_virtual_sch(cdev->devno, errp);
Error *err = NULL;
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->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)