xref: /openbmc/qemu/hw/s390x/3270-ccw.c (revision 9516034d)
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 */
handle_payload_3270_read(EmulatedCcw3270Device * dev,CCW1 * ccw)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 */
handle_payload_3270_write(EmulatedCcw3270Device * dev,CCW1 * ccw)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 
emulated_ccw_3270_cb(SubchDev * sch,CCW1 ccw)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 
emulated_ccw_3270_realize(DeviceState * ds,Error ** errp)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 Property emulated_ccw_3270_properties[] = {
154     DEFINE_PROP_END_OF_LIST(),
155 };
156 
emulated_ccw_3270_class_init(ObjectClass * klass,void * data)157 static 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 
167 static 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 
emulated_ccw_register(void)176 static void emulated_ccw_register(void)
177 {
178     type_register_static(&emulated_ccw_3270_info);
179 }
180 
181 type_init(emulated_ccw_register)
182