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
s390_ccw_cmd_request(SubchDev * sch)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
s390_ccw_halt(SubchDev * sch)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
s390_ccw_clear(SubchDev * sch)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
s390_ccw_store(SubchDev * sch)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 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
s390_ccw_get_dev_info(S390CCWDevice * cdev,char * sysfsdev,Error ** errp)74 static bool 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};
80 g_autofree char *tmp_dir = NULL;
81 g_autofree char *tmp = NULL;
82
83 if (!sysfsdev) {
84 error_setg(errp, "No host device provided");
85 error_append_hint(errp,
86 "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
87 return false;
88 }
89
90 if (!realpath(sysfsdev, dev_path)) {
91 error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
92 return false;
93 }
94
95 cdev->mdevid = g_path_get_basename(dev_path);
96
97 tmp_dir = g_path_get_dirname(dev_path);
98 tmp = g_path_get_basename(tmp_dir);
99 if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
100 error_setg_errno(errp, errno, "Failed to read %s", tmp);
101 return false;
102 }
103
104 cdev->hostid.cssid = cssid;
105 cdev->hostid.ssid = ssid;
106 cdev->hostid.devid = devid;
107 cdev->hostid.valid = true;
108 return true;
109 }
110
s390_ccw_realize(S390CCWDevice * cdev,char * sysfsdev,Error ** errp)111 static bool s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
112 {
113 CcwDevice *ccw_dev = CCW_DEVICE(cdev);
114 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
115 DeviceState *parent = DEVICE(ccw_dev);
116 SubchDev *sch;
117 int ret;
118
119 if (!s390_ccw_get_dev_info(cdev, sysfsdev, errp)) {
120 return false;
121 }
122
123 sch = css_create_sch(ccw_dev->devno, errp);
124 if (!sch) {
125 goto out_mdevid_free;
126 }
127 sch->driver_data = cdev;
128 sch->do_subchannel_work = do_subchannel_work_passthrough;
129 sch->irb_cb = build_irb_passthrough;
130
131 ccw_dev->sch = sch;
132 ret = css_sch_build_schib(sch, &cdev->hostid);
133 if (ret) {
134 error_setg_errno(errp, -ret, "%s: Failed to build initial schib",
135 __func__);
136 goto out_err;
137 }
138
139 if (!ck->realize(ccw_dev, errp)) {
140 goto out_err;
141 }
142
143 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
144 parent->hotplugged, 1);
145 return true;
146
147 out_err:
148 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
149 ccw_dev->sch = NULL;
150 g_free(sch);
151 out_mdevid_free:
152 g_free(cdev->mdevid);
153 return false;
154 }
155
s390_ccw_unrealize(S390CCWDevice * cdev)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
s390_ccw_instance_init(Object * obj)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
s390_ccw_class_init(ObjectClass * klass,void * data)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
register_s390_ccw_type(void)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)
202