hw/s390x/s390-ccw.c

   1 /*
   2  * s390 CCW Assignment Support
   3  *
   4  * Copyright 2017 IBM Corp
   5  * Author(s): Dong Jia Shi <[email protected]>
   6  *            Xiao Feng Ren <[email protected]>
   7  *            Pierre Morel <[email protected]>
   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 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 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
  54                                   char *sysfsdev,
  55                                   Error **errp)
  56 {
  57     unsigned int cssid, ssid, devid;
  58     char dev_path[PATH_MAX] = {0}, *tmp;
  59
  60     if (!sysfsdev) {
  61         error_setg(errp, "No host device provided");
  62         error_append_hint(errp,
  63                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
  64         return;
  65     }
  66
  67     if (!realpath(sysfsdev, dev_path)) {
  68         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  69         return;
  70     }
  71
  72     cdev->mdevid = g_path_get_basename(dev_path);
  73
  74     tmp = basename(dirname(dev_path));
  75     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
  76         error_setg_errno(errp, errno, "Failed to read %s", tmp);
  77         return;
  78     }
  79
  80     cdev->hostid.cssid = cssid;
  81     cdev->hostid.ssid = ssid;
  82     cdev->hostid.devid = devid;
  83     cdev->hostid.valid = true;
  84 }
  85
  86 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
  87 {
  88     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
  89     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
  90     DeviceState *parent = DEVICE(ccw_dev);
  91     SubchDev *sch;
  92     int ret;
  93     Error *err = NULL;
  94
  95     s390_ccw_get_dev_info(cdev, sysfsdev, &err);
  96     if (err) {
  97         goto out_err_propagate;
  98     }
  99
 100     sch = css_create_sch(ccw_dev->devno, &err);
 101     if (!sch) {
 102         goto out_mdevid_free;
 103     }
 104     sch->driver_data = cdev;
 105     sch->do_subchannel_work = do_subchannel_work_passthrough;
 106
 107     ccw_dev->sch = sch;
 108     ret = css_sch_build_schib(sch, &cdev->hostid);
 109     if (ret) {
 110         error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
 111                          __func__);
 112         goto out_err;
 113     }
 114
 115     ck->realize(ccw_dev, &err);
 116     if (err) {
 117         goto out_err;
 118     }
 119
 120     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
 121                           parent->hotplugged, 1);
 122     return;
 123
 124 out_err:
 125     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 126     ccw_dev->sch = NULL;
 127     g_free(sch);
 128 out_mdevid_free:
 129     g_free(cdev->mdevid);
 130 out_err_propagate:
 131     error_propagate(errp, err);
 132 }
 133
 134 static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp)
 135 {
 136     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 137     SubchDev *sch = ccw_dev->sch;
 138
 139     if (sch) {
 140         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 141         g_free(sch);
 142         ccw_dev->sch = NULL;
 143     }
 144
 145     g_free(cdev->mdevid);
 146 }
 147
 148 static void s390_ccw_instance_init(Object *obj)
 149 {
 150     S390CCWDevice *dev = S390_CCW_DEVICE(obj);
 151
 152     device_add_bootindex_property(obj, &dev->bootindex, "bootindex",
 153                                   "/disk@0,0", DEVICE(obj), NULL);
 154 }
 155
 156 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 157 {
 158     DeviceClass *dc = DEVICE_CLASS(klass);
 159     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 160
 161     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 162     cdc->realize = s390_ccw_realize;
 163     cdc->unrealize = s390_ccw_unrealize;
 164 }
 165
 166 static const TypeInfo s390_ccw_info = {
 167     .name          = TYPE_S390_CCW,
 168     .parent        = TYPE_CCW_DEVICE,
 169     .instance_init = s390_ccw_instance_init,
 170     .instance_size = sizeof(S390CCWDevice),
 171     .class_size    = sizeof(S390CCWDeviceClass),
 172     .class_init    = s390_ccw_class_init,
 173     .abstract      = true,
 174 };
 175
 176 static void register_s390_ccw_type(void)
 177 {
 178     type_register_static(&s390_ccw_info);
 179 }
 180
 181 type_init(register_s390_ccw_type)