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