hw/s390x/s390-ccw.c

   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)