hw/s390x/3270-ccw.c

   1 /*
   2  * Emulated ccw-attached 3270 implementation
   3  *
   4  * Copyright 2017 IBM Corp.
   5  * Author(s): Yang Chen <bjcyang@linux.vnet.ibm.com>
   6  *            Jing Liu <liujbjl@linux.vnet.ibm.com>
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   9  * your option) any later version. See the COPYING file in the top-level
  10  * directory.
  11  */
  12 #include "qemu/osdep.h"
  13 #include "qapi/error.h"
  14 #include "qemu/module.h"
  15 #include "cpu.h"
  16 #include "hw/s390x/css.h"
  17 #include "hw/s390x/css-bridge.h"
  18 #include "hw/s390x/3270-ccw.h"
  19
  20 /* Handle READ ccw commands from guest */
  21 static int handle_payload_3270_read(EmulatedCcw3270Device *dev, CCW1 *ccw)
  22 {
  23     EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
  24     CcwDevice *ccw_dev = CCW_DEVICE(dev);
  25     int len;
  26
  27     if (!ccw->cda) {
  28         return -EFAULT;
  29     }
  30
  31     len = ck->read_payload_3270(dev);
  32     ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
  33
  34     return 0;
  35 }
  36
  37 /* Handle WRITE ccw commands to write data to client */
  38 static int handle_payload_3270_write(EmulatedCcw3270Device *dev, CCW1 *ccw)
  39 {
  40     EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
  41     CcwDevice *ccw_dev = CCW_DEVICE(dev);
  42     int len;
  43
  44     if (!ccw->cda) {
  45         return -EFAULT;
  46     }
  47
  48     len = ck->write_payload_3270(dev, ccw->cmd_code);
  49
  50     if (len <= 0) {
  51         return -EIO;
  52     }
  53
  54     ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
  55     return 0;
  56 }
  57
  58 static int emulated_ccw_3270_cb(SubchDev *sch, CCW1 ccw)
  59 {
  60     int rc = 0;
  61     EmulatedCcw3270Device *dev = sch->driver_data;
  62
  63     switch (ccw.cmd_code) {
  64     case TC_WRITESF:
  65     case TC_WRITE:
  66     case TC_EWRITE:
  67     case TC_EWRITEA:
  68         rc = handle_payload_3270_write(dev, &ccw);
  69         break;
  70     case TC_RDBUF:
  71     case TC_READMOD:
  72         rc = handle_payload_3270_read(dev, &ccw);
  73         break;
  74     default:
  75         rc = -ENOSYS;
  76         break;
  77     }
  78
  79     if (rc == -EIO) {
  80         /* I/O error, specific devices generate specific conditions */
  81         SCSW *s = &sch->curr_status.scsw;
  82
  83         sch->curr_status.scsw.dstat = SCSW_DSTAT_UNIT_CHECK;
  84         sch->sense_data[0] = 0x40;    /* intervention-req */
  85         s->ctrl &= ~SCSW_ACTL_START_PEND;
  86         s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
  87         s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
  88                    SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
  89     }
  90
  91     return rc;
  92 }
  93
  94 static void emulated_ccw_3270_realize(DeviceState *ds, Error **errp)
  95 {
  96     uint16_t chpid;
  97     EmulatedCcw3270Device *dev = EMULATED_CCW_3270(ds);
  98     EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
  99     CcwDevice *cdev = CCW_DEVICE(ds);
 100     CCWDeviceClass *cdk = CCW_DEVICE_GET_CLASS(cdev);
 101     DeviceState *parent = DEVICE(cdev);
 102     BusState *qbus = qdev_get_parent_bus(parent);
 103     VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus);
 104     SubchDev *sch;
 105     Error *err = NULL;
 106
 107     sch = css_create_sch(cdev->devno, true, cbus->squash_mcss, errp);
 108     if (!sch) {
 109         return;
 110     }
 111
 112     if (!ck->init) {
 113         goto out_err;
 114     }
 115
 116     sch->driver_data = dev;
 117     cdev->sch = sch;
 118     chpid = css_find_free_chpid(sch->cssid);
 119
 120     if (chpid > MAX_CHPID) {
 121         error_setg(&err, "No available chpid to use.");
 122         goto out_err;
 123     }
 124
 125     sch->id.reserved = 0xff;
 126     sch->id.cu_type = EMULATED_CCW_3270_CU_TYPE;
 127     css_sch_build_virtual_schib(sch, (uint8_t)chpid,
 128                                 EMULATED_CCW_3270_CHPID_TYPE);
 129     sch->do_subchannel_work = do_subchannel_work_virtual;
 130     sch->ccw_cb = emulated_ccw_3270_cb;
 131
 132     ck->init(dev, &err);
 133     if (err) {
 134         goto out_err;
 135     }
 136
 137     cdk->realize(cdev, &err);
 138     if (err) {
 139         goto out_err;
 140     }
 141
 142     return;
 143
 144 out_err:
 145     error_propagate(errp, err);
 146     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 147     cdev->sch = NULL;
 148     g_free(sch);
 149 }
 150
 151 static Property emulated_ccw_3270_properties[] = {
 152     DEFINE_PROP_END_OF_LIST(),
 153 };
 154
 155 static void emulated_ccw_3270_class_init(ObjectClass *klass, void *data)
 156 {
 157     DeviceClass *dc = DEVICE_CLASS(klass);
 158
 159     dc->props = emulated_ccw_3270_properties;
 160     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 161     dc->realize = emulated_ccw_3270_realize;
 162     dc->hotpluggable = false;
 163 }
 164
 165 static const TypeInfo emulated_ccw_3270_info = {
 166     .name = TYPE_EMULATED_CCW_3270,
 167     .parent = TYPE_CCW_DEVICE,
 168     .instance_size = sizeof(EmulatedCcw3270Device),
 169     .class_init = emulated_ccw_3270_class_init,
 170     .class_size = sizeof(EmulatedCcw3270Class),
 171     .abstract = true,
 172 };
 173
 174 static void emulated_ccw_register(void)
 175 {
 176     type_register_static(&emulated_ccw_3270_info);
 177 }
 178
 179 type_init(emulated_ccw_register)