| 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/core/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 | 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 | |
| 146 | out_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 | |
| 153 | static void emulated_ccw_3270_class_init(ObjectClass *klass, const void *data) |
| 154 | { |
| 155 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 156 | |
| 157 | dc->realize = emulated_ccw_3270_realize; |
| 158 | dc->hotpluggable = false; |
| 159 | set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories); |
| 160 | } |
| 161 | |
| 162 | static const TypeInfo emulated_ccw_3270_info = { |
| 163 | .name = TYPE_EMULATED_CCW_3270, |
| 164 | .parent = TYPE_CCW_DEVICE, |
| 165 | .instance_size = sizeof(EmulatedCcw3270Device), |
| 166 | .class_init = emulated_ccw_3270_class_init, |
| 167 | .class_size = sizeof(EmulatedCcw3270Class), |
| 168 | .abstract = true, |
| 169 | }; |
| 170 | |
| 171 | static void emulated_ccw_register(void) |
| 172 | { |
| 173 | type_register_static(&emulated_ccw_3270_info); |
| 174 | } |
| 175 | |
| 176 | type_init(emulated_ccw_register) |