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