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Dong Jia Shia8eac942017-05-17 02:48:06 +02001/*
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 */
Markus Armbrusterd8e39b72018-02-01 12:18:28 +010013
Dong Jia Shia8eac942017-05-17 02:48:06 +020014#include "qemu/osdep.h"
Markus Armbrusterd8e39b72018-02-01 12:18:28 +010015#include <libgen.h>
Dong Jia Shia8eac942017-05-17 02:48:06 +020016#include "qapi/error.h"
Markus Armbruster0b8fa322019-05-23 16:35:07 +020017#include "qemu/module.h"
Dong Jia Shia8eac942017-05-17 02:48:06 +020018#include "hw/s390x/css.h"
19#include "hw/s390x/css-bridge.h"
20#include "hw/s390x/s390-ccw.h"
Markus Armbruster2f780b62019-08-12 07:23:58 +020021#include "sysemu/sysemu.h"
Dong Jia Shia8eac942017-05-17 02:48:06 +020022
Halil Pasic66dc50f2017-10-17 16:04:49 +020023IOInstEnding s390_ccw_cmd_request(SubchDev *sch)
Xiao Feng Renbab482d2017-05-17 02:48:11 +020024{
Halil Pasic66dc50f2017-10-17 16:04:49 +020025 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
Xiao Feng Renbab482d2017-05-17 02:48:11 +020026
Halil Pasic66dc50f2017-10-17 16:04:49 +020027 if (!cdc->handle_request) {
28 return IOINST_CC_STATUS_PRESENT;
Xiao Feng Renbab482d2017-05-17 02:48:11 +020029 }
Halil Pasic66dc50f2017-10-17 16:04:49 +020030 return cdc->handle_request(sch);
Xiao Feng Renbab482d2017-05-17 02:48:11 +020031}
32
Cornelia Huck8fadea22019-05-07 17:47:33 +020033int 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
43int 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
Farhan Ali46ea3842020-05-05 14:57:54 +020053IOInstEnding 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
Dong Jia Shia8eac942017-05-17 02:48:06 +020074static 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
Julia Suvorova3e015d82018-03-01 10:08:06 +030093 cdev->mdevid = g_path_get_basename(dev_path);
Dong Jia Shia8eac942017-05-17 02:48:06 +020094
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
107static 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);
Dong Jia Shia8eac942017-05-17 02:48:06 +0200112 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
Cornelia Huck36699ab2018-07-23 18:32:21 +0200121 sch = css_create_sch(ccw_dev->devno, &err);
Dong Jia Shia8eac942017-05-17 02:48:06 +0200122 if (!sch) {
123 goto out_mdevid_free;
124 }
125 sch->driver_data = cdev;
Xiao Feng Renbab482d2017-05-17 02:48:11 +0200126 sch->do_subchannel_work = do_subchannel_work_passthrough;
Eric Farmanc6267102021-06-18 01:25:37 +0200127 sch->irb_cb = build_irb_passthrough;
Dong Jia Shia8eac942017-05-17 02:48:06 +0200128
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
146out_err:
147 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
148 ccw_dev->sch = NULL;
149 g_free(sch);
150out_mdevid_free:
151 g_free(cdev->mdevid);
152out_err_propagate:
153 error_propagate(errp, err);
154}
155
Markus Armbrusterb69c3c22020-05-05 17:29:24 +0200156static void s390_ccw_unrealize(S390CCWDevice *cdev)
Dong Jia Shia8eac942017-05-17 02:48:06 +0200157{
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
Jason J. Herne44445d82019-04-04 10:34:20 -0400170static 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",
Markus Armbruster40c22812020-05-05 17:29:23 +0200175 "/disk@0,0", DEVICE(obj));
Jason J. Herne44445d82019-04-04 10:34:20 -0400176}
177
Dong Jia Shia8eac942017-05-17 02:48:06 +0200178static void s390_ccw_class_init(ObjectClass *klass, void *data)
179{
Dong Jia Shia8eac942017-05-17 02:48:06 +0200180 S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
181
Dong Jia Shia8eac942017-05-17 02:48:06 +0200182 cdc->realize = s390_ccw_realize;
183 cdc->unrealize = s390_ccw_unrealize;
184}
185
186static const TypeInfo s390_ccw_info = {
187 .name = TYPE_S390_CCW,
188 .parent = TYPE_CCW_DEVICE,
Jason J. Herne44445d82019-04-04 10:34:20 -0400189 .instance_init = s390_ccw_instance_init,
Dong Jia Shia8eac942017-05-17 02:48:06 +0200190 .instance_size = sizeof(S390CCWDevice),
191 .class_size = sizeof(S390CCWDeviceClass),
192 .class_init = s390_ccw_class_init,
193 .abstract = true,
194};
195
196static void register_s390_ccw_type(void)
197{
198 type_register_static(&s390_ccw_info);
199}
200
201type_init(register_s390_ccw_type)