qemu

3270-ccw.c (4638B)

---

 /*
  * 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 "hw/s390x/css.h"
 #include "hw/s390x/css-bridge.h"
 #include "hw/qdev-properties.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);
     if (len < 0) {
         return len;
     }
     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);
 
     if (len <= 0) {
         return len ? len : -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 */
         SCHIB *schib = &sch->curr_status;
 
         sch->curr_status.scsw.dstat = SCSW_DSTAT_UNIT_CHECK;
         sch->sense_data[0] = 0x40;    /* intervention-req */
         schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
         schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
         schib->scsw.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;
     Error *err = NULL;
 
     sch = css_create_sch(cdev->devno, 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;
     sch->irb_cb = build_irb_virtual;
 
     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);
 
     device_class_set_props(dc, emulated_ccw_3270_properties);
     dc->realize = emulated_ccw_3270_realize;
     dc->hotpluggable = false;
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
 }
 
 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)