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#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 */
  21static 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 */
  38static 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
  58static 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
  94static 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
 144out_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
 151static Property emulated_ccw_3270_properties[] = {
 152    DEFINE_PROP_END_OF_LIST(),
 153};
 154
 155static 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    set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
 164}
 165
 166static 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
 175static void emulated_ccw_register(void)
 176{
 177    type_register_static(&emulated_ccw_3270_info);
 178}
 179
 180type_init(emulated_ccw_register)
 181