Merge remote-tracking branch 'remotes/thuth-gitlab/tags/pull-request-2022-01-19'...
[qemu.git] / hw / s390x / s390-ccw.c
1 /*
2 * s390 CCW Assignment Support
3 *
4 * Copyright 2017 IBM Corp
5 * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
6 * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
7 * Pierre Morel <pmorel@linux.vnet.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2
10 * or (at your option) any later version. See the COPYING file in the
11 * top-level directory.
12 */
13
14 #include "qemu/osdep.h"
15 #include <libgen.h>
16 #include "qapi/error.h"
17 #include "qemu/module.h"
18 #include "hw/s390x/css.h"
19 #include "hw/s390x/css-bridge.h"
20 #include "hw/s390x/s390-ccw.h"
21 #include "sysemu/sysemu.h"
22
23 IOInstEnding s390_ccw_cmd_request(SubchDev *sch)
24 {
25 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
26
27 if (!cdc->handle_request) {
28 return IOINST_CC_STATUS_PRESENT;
29 }
30 return cdc->handle_request(sch);
31 }
32
33 int s390_ccw_halt(SubchDev *sch)
34 {
35 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
36
37 if (!cdc->handle_halt) {
38 return -ENOSYS;
39 }
40 return cdc->handle_halt(sch);
41 }
42
43 int s390_ccw_clear(SubchDev *sch)
44 {
45 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
46
47 if (!cdc->handle_clear) {
48 return -ENOSYS;
49 }
50 return cdc->handle_clear(sch);
51 }
52
53 IOInstEnding s390_ccw_store(SubchDev *sch)
54 {
55 S390CCWDeviceClass *cdc = NULL;
56 int ret = IOINST_CC_EXPECTED;
57
58 /*
59 * This code is called for both virtual and passthrough devices,
60 * but only applies to to the latter. This ugly check makes that
61 * distinction for us.
62 */
63 if (object_dynamic_cast(OBJECT(sch->driver_data), TYPE_S390_CCW)) {
64 cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
65 }
66
67 if (cdc && cdc->handle_store) {
68 ret = cdc->handle_store(sch);
69 }
70
71 return ret;
72 }
73
74 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
75 char *sysfsdev,
76 Error **errp)
77 {
78 unsigned int cssid, ssid, devid;
79 char dev_path[PATH_MAX] = {0}, *tmp;
80
81 if (!sysfsdev) {
82 error_setg(errp, "No host device provided");
83 error_append_hint(errp,
84 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
85 return;
86 }
87
88 if (!realpath(sysfsdev, dev_path)) {
89 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
90 return;
91 }
92
93 cdev->mdevid = g_path_get_basename(dev_path);
94
95 tmp = basename(dirname(dev_path));
96 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
97 error_setg_errno(errp, errno, "Failed to read %s", tmp);
98 return;
99 }
100
101 cdev->hostid.cssid = cssid;
102 cdev->hostid.ssid = ssid;
103 cdev->hostid.devid = devid;
104 cdev->hostid.valid = true;
105 }
106
107 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
108 {
109 CcwDevice *ccw_dev = CCW_DEVICE(cdev);
110 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
111 DeviceState *parent = DEVICE(ccw_dev);
112 SubchDev *sch;
113 int ret;
114 Error *err = NULL;
115
116 s390_ccw_get_dev_info(cdev, sysfsdev, &err);
117 if (err) {
118 goto out_err_propagate;
119 }
120
121 sch = css_create_sch(ccw_dev->devno, &err);
122 if (!sch) {
123 goto out_mdevid_free;
124 }
125 sch->driver_data = cdev;
126 sch->do_subchannel_work = do_subchannel_work_passthrough;
127 sch->irb_cb = build_irb_passthrough;
128
129 ccw_dev->sch = sch;
130 ret = css_sch_build_schib(sch, &cdev->hostid);
131 if (ret) {
132 error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
133 __func__);
134 goto out_err;
135 }
136
137 ck->realize(ccw_dev, &err);
138 if (err) {
139 goto out_err;
140 }
141
142 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
143 parent->hotplugged, 1);
144 return;
145
146 out_err:
147 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
148 ccw_dev->sch = NULL;
149 g_free(sch);
150 out_mdevid_free:
151 g_free(cdev->mdevid);
152 out_err_propagate:
153 error_propagate(errp, err);
154 }
155
156 static void s390_ccw_unrealize(S390CCWDevice *cdev)
157 {
158 CcwDevice *ccw_dev = CCW_DEVICE(cdev);
159 SubchDev *sch = ccw_dev->sch;
160
161 if (sch) {
162 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
163 g_free(sch);
164 ccw_dev->sch = NULL;
165 }
166
167 g_free(cdev->mdevid);
168 }
169
170 static void s390_ccw_instance_init(Object *obj)
171 {
172 S390CCWDevice *dev = S390_CCW_DEVICE(obj);
173
174 device_add_bootindex_property(obj, &dev->bootindex, "bootindex",
175 "/disk@0,0", DEVICE(obj));
176 }
177
178 static void s390_ccw_class_init(ObjectClass *klass, void *data)
179 {
180 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
181
182 cdc->realize = s390_ccw_realize;
183 cdc->unrealize = s390_ccw_unrealize;
184 }
185
186 static const TypeInfo s390_ccw_info = {
187 .name = TYPE_S390_CCW,
188 .parent = TYPE_CCW_DEVICE,
189 .instance_init = s390_ccw_instance_init,
190 .instance_size = sizeof(S390CCWDevice),
191 .class_size = sizeof(S390CCWDeviceClass),
192 .class_init = s390_ccw_class_init,
193 .abstract = true,
194 };
195
196 static void register_s390_ccw_type(void)
197 {
198 type_register_static(&s390_ccw_info);
199 }
200
201 type_init(register_s390_ccw_type)