xref: /openbmc/qemu/hw/s390x/s390-ccw.c (revision 500eb6db)
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/sysbus.h"
19 #include "hw/s390x/css.h"
20 #include "hw/s390x/css-bridge.h"
21 #include "hw/s390x/s390-ccw.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 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
34                                   char *sysfsdev,
35                                   Error **errp)
36 {
37     unsigned int cssid, ssid, devid;
38     char dev_path[PATH_MAX] = {0}, *tmp;
39 
40     if (!sysfsdev) {
41         error_setg(errp, "No host device provided");
42         error_append_hint(errp,
43                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
44         return;
45     }
46 
47     if (!realpath(sysfsdev, dev_path)) {
48         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
49         return;
50     }
51 
52     cdev->mdevid = g_path_get_basename(dev_path);
53 
54     tmp = basename(dirname(dev_path));
55     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
56         error_setg_errno(errp, errno, "Failed to read %s", tmp);
57         return;
58     }
59 
60     cdev->hostid.cssid = cssid;
61     cdev->hostid.ssid = ssid;
62     cdev->hostid.devid = devid;
63     cdev->hostid.valid = true;
64 }
65 
66 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
67 {
68     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
69     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
70     DeviceState *parent = DEVICE(ccw_dev);
71     SubchDev *sch;
72     int ret;
73     Error *err = NULL;
74 
75     s390_ccw_get_dev_info(cdev, sysfsdev, &err);
76     if (err) {
77         goto out_err_propagate;
78     }
79 
80     sch = css_create_sch(ccw_dev->devno, &err);
81     if (!sch) {
82         goto out_mdevid_free;
83     }
84     sch->driver_data = cdev;
85     sch->do_subchannel_work = do_subchannel_work_passthrough;
86 
87     ccw_dev->sch = sch;
88     ret = css_sch_build_schib(sch, &cdev->hostid);
89     if (ret) {
90         error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
91                          __func__);
92         goto out_err;
93     }
94 
95     ck->realize(ccw_dev, &err);
96     if (err) {
97         goto out_err;
98     }
99 
100     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
101                           parent->hotplugged, 1);
102     return;
103 
104 out_err:
105     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
106     ccw_dev->sch = NULL;
107     g_free(sch);
108 out_mdevid_free:
109     g_free(cdev->mdevid);
110 out_err_propagate:
111     error_propagate(errp, err);
112 }
113 
114 static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp)
115 {
116     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
117     SubchDev *sch = ccw_dev->sch;
118 
119     if (sch) {
120         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
121         g_free(sch);
122         ccw_dev->sch = NULL;
123     }
124 
125     g_free(cdev->mdevid);
126 }
127 
128 static void s390_ccw_instance_init(Object *obj)
129 {
130     S390CCWDevice *dev = S390_CCW_DEVICE(obj);
131 
132     device_add_bootindex_property(obj, &dev->bootindex, "bootindex",
133                                   "/disk@0,0", DEVICE(obj), NULL);
134 }
135 
136 static void s390_ccw_class_init(ObjectClass *klass, void *data)
137 {
138     DeviceClass *dc = DEVICE_CLASS(klass);
139     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
140 
141     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
142     cdc->realize = s390_ccw_realize;
143     cdc->unrealize = s390_ccw_unrealize;
144 }
145 
146 static const TypeInfo s390_ccw_info = {
147     .name          = TYPE_S390_CCW,
148     .parent        = TYPE_CCW_DEVICE,
149     .instance_init = s390_ccw_instance_init,
150     .instance_size = sizeof(S390CCWDevice),
151     .class_size    = sizeof(S390CCWDeviceClass),
152     .class_init    = s390_ccw_class_init,
153     .abstract      = true,
154 };
155 
156 static void register_s390_ccw_type(void)
157 {
158     type_register_static(&s390_ccw_info);
159 }
160 
161 type_init(register_s390_ccw_type)
162