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 | #include "sysemu/sysemu.h" |
23 | |
24 | IOInstEnding s390_ccw_cmd_request(SubchDev *sch) |
25 | { |
26 | S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); |
27 | |
28 | if (!cdc->handle_request) { |
29 | return IOINST_CC_STATUS_PRESENT; |
30 | } |
31 | return cdc->handle_request(sch); |
32 | } |
33 | |
34 | int s390_ccw_halt(SubchDev *sch) |
35 | { |
36 | S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); |
37 | |
38 | if (!cdc->handle_halt) { |
39 | return -ENOSYS; |
40 | } |
41 | return cdc->handle_halt(sch); |
42 | } |
43 | |
44 | int s390_ccw_clear(SubchDev *sch) |
45 | { |
46 | S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data); |
47 | |
48 | if (!cdc->handle_clear) { |
49 | return -ENOSYS; |
50 | } |
51 | return cdc->handle_clear(sch); |
52 | } |
53 | |
54 | static void s390_ccw_get_dev_info(S390CCWDevice *cdev, |
55 | char *sysfsdev, |
56 | Error **errp) |
57 | { |
58 | unsigned int cssid, ssid, devid; |
59 | char dev_path[PATH_MAX] = {0}, *tmp; |
60 | |
61 | if (!sysfsdev) { |
62 | error_setg(errp, "No host device provided" ); |
63 | error_append_hint(errp, |
64 | "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n" ); |
65 | return; |
66 | } |
67 | |
68 | if (!realpath(sysfsdev, dev_path)) { |
69 | error_setg_errno(errp, errno, "Host device '%s' not found" , sysfsdev); |
70 | return; |
71 | } |
72 | |
73 | cdev->mdevid = g_path_get_basename(dev_path); |
74 | |
75 | tmp = basename(dirname(dev_path)); |
76 | if (sscanf(tmp, "%2x.%1x.%4x" , &cssid, &ssid, &devid) != 3) { |
77 | error_setg_errno(errp, errno, "Failed to read %s" , tmp); |
78 | return; |
79 | } |
80 | |
81 | cdev->hostid.cssid = cssid; |
82 | cdev->hostid.ssid = ssid; |
83 | cdev->hostid.devid = devid; |
84 | cdev->hostid.valid = true; |
85 | } |
86 | |
87 | static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) |
88 | { |
89 | CcwDevice *ccw_dev = CCW_DEVICE(cdev); |
90 | CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); |
91 | DeviceState *parent = DEVICE(ccw_dev); |
92 | SubchDev *sch; |
93 | int ret; |
94 | Error *err = NULL; |
95 | |
96 | s390_ccw_get_dev_info(cdev, sysfsdev, &err); |
97 | if (err) { |
98 | goto out_err_propagate; |
99 | } |
100 | |
101 | sch = css_create_sch(ccw_dev->devno, &err); |
102 | if (!sch) { |
103 | goto out_mdevid_free; |
104 | } |
105 | sch->driver_data = cdev; |
106 | sch->do_subchannel_work = do_subchannel_work_passthrough; |
107 | |
108 | ccw_dev->sch = sch; |
109 | ret = css_sch_build_schib(sch, &cdev->hostid); |
110 | if (ret) { |
111 | error_setg_errno(&err, -ret, "%s: Failed to build initial schib" , |
112 | __func__); |
113 | goto out_err; |
114 | } |
115 | |
116 | ck->realize(ccw_dev, &err); |
117 | if (err) { |
118 | goto out_err; |
119 | } |
120 | |
121 | css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, |
122 | parent->hotplugged, 1); |
123 | return; |
124 | |
125 | out_err: |
126 | css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); |
127 | ccw_dev->sch = NULL; |
128 | g_free(sch); |
129 | out_mdevid_free: |
130 | g_free(cdev->mdevid); |
131 | out_err_propagate: |
132 | error_propagate(errp, err); |
133 | } |
134 | |
135 | static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp) |
136 | { |
137 | CcwDevice *ccw_dev = CCW_DEVICE(cdev); |
138 | SubchDev *sch = ccw_dev->sch; |
139 | |
140 | if (sch) { |
141 | css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); |
142 | g_free(sch); |
143 | ccw_dev->sch = NULL; |
144 | } |
145 | |
146 | g_free(cdev->mdevid); |
147 | } |
148 | |
149 | static void s390_ccw_instance_init(Object *obj) |
150 | { |
151 | S390CCWDevice *dev = S390_CCW_DEVICE(obj); |
152 | |
153 | device_add_bootindex_property(obj, &dev->bootindex, "bootindex" , |
154 | "/disk@0,0" , DEVICE(obj), NULL); |
155 | } |
156 | |
157 | static void s390_ccw_class_init(ObjectClass *klass, void *data) |
158 | { |
159 | DeviceClass *dc = DEVICE_CLASS(klass); |
160 | S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass); |
161 | |
162 | dc->bus_type = TYPE_VIRTUAL_CSS_BUS; |
163 | cdc->realize = s390_ccw_realize; |
164 | cdc->unrealize = s390_ccw_unrealize; |
165 | } |
166 | |
167 | static const TypeInfo s390_ccw_info = { |
168 | .name = TYPE_S390_CCW, |
169 | .parent = TYPE_CCW_DEVICE, |
170 | .instance_init = s390_ccw_instance_init, |
171 | .instance_size = sizeof(S390CCWDevice), |
172 | .class_size = sizeof(S390CCWDeviceClass), |
173 | .class_init = s390_ccw_class_init, |
174 | .abstract = true, |
175 | }; |
176 | |
177 | static void register_s390_ccw_type(void) |
178 | { |
179 | type_register_static(&s390_ccw_info); |
180 | } |
181 | |
182 | type_init(register_s390_ccw_type) |
183 | |