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 "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 */
  22static 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 */
  42static 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
  62static 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
  98static 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    sch->irb_cb = build_irb_virtual;
 133
 134    ck->init(dev, &err);
 135    if (err) {
 136        goto out_err;
 137    }
 138
 139    cdk->realize(cdev, &err);
 140    if (err) {
 141        goto out_err;
 142    }
 143
 144    return;
 145
 146out_err:
 147    error_propagate(errp, err);
 148    css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 149    cdev->sch = NULL;
 150    g_free(sch);
 151}
 152
 153static Property emulated_ccw_3270_properties[] = {
 154    DEFINE_PROP_END_OF_LIST(),
 155};
 156
 157static void emulated_ccw_3270_class_init(ObjectClass *klass, void *data)
 158{
 159    DeviceClass *dc = DEVICE_CLASS(klass);
 160
 161    device_class_set_props(dc, emulated_ccw_3270_properties);
 162    dc->realize = emulated_ccw_3270_realize;
 163    dc->hotpluggable = false;
 164    set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
 165}
 166
 167static const TypeInfo emulated_ccw_3270_info = {
 168    .name = TYPE_EMULATED_CCW_3270,
 169    .parent = TYPE_CCW_DEVICE,
 170    .instance_size = sizeof(EmulatedCcw3270Device),
 171    .class_init = emulated_ccw_3270_class_init,
 172    .class_size = sizeof(EmulatedCcw3270Class),
 173    .abstract = true,
 174};
 175
 176static void emulated_ccw_register(void)
 177{
 178    type_register_static(&emulated_ccw_3270_info);
 179}
 180
 181type_init(emulated_ccw_register)
 182