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/s390x/css.h"
  19 #include "hw/s390x/css-bridge.h"
  20 #include "hw/s390x/s390-ccw.h"
  21 #include "sysemu/sysemu.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 IOInstEnding 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 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
  74 static 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};
  80     g_autofree char *tmp_dir = NULL;
  81     g_autofree char *tmp = NULL;
  82
  83     if (!sysfsdev) {
  84         error_setg(errp, "No host device provided");
  85         error_append_hint(errp,
  86                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
  87         return;
  88     }
  89
  90     if (!realpath(sysfsdev, dev_path)) {
  91         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  92         return;
  93     }
  94
  95     cdev->mdevid = g_path_get_basename(dev_path);
  96
  97     tmp_dir = g_path_get_dirname(dev_path);
  98     tmp = g_path_get_basename(tmp_dir);
  99     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
 100         error_setg_errno(errp, errno, "Failed to read %s", tmp);
 101         return;
 102     }
 103
 104     cdev->hostid.cssid = cssid;
 105     cdev->hostid.ssid = ssid;
 106     cdev->hostid.devid = devid;
 107     cdev->hostid.valid = true;
 108 }
 109
 110 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
 111 {
 112     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 113     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
 114     DeviceState *parent = DEVICE(ccw_dev);
 115     SubchDev *sch;
 116     int ret;
 117     Error *err = NULL;
 118
 119     s390_ccw_get_dev_info(cdev, sysfsdev, &err);
 120     if (err) {
 121         goto out_err_propagate;
 122     }
 123
 124     sch = css_create_sch(ccw_dev->devno, &err);
 125     if (!sch) {
 126         goto out_mdevid_free;
 127     }
 128     sch->driver_data = cdev;
 129     sch->do_subchannel_work = do_subchannel_work_passthrough;
 130     sch->irb_cb = build_irb_passthrough;
 131
 132     ccw_dev->sch = sch;
 133     ret = css_sch_build_schib(sch, &cdev->hostid);
 134     if (ret) {
 135         error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
 136                          __func__);
 137         goto out_err;
 138     }
 139
 140     ck->realize(ccw_dev, &err);
 141     if (err) {
 142         goto out_err;
 143     }
 144
 145     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
 146                           parent->hotplugged, 1);
 147     return;
 148
 149 out_err:
 150     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 151     ccw_dev->sch = NULL;
 152     g_free(sch);
 153 out_mdevid_free:
 154     g_free(cdev->mdevid);
 155 out_err_propagate:
 156     error_propagate(errp, err);
 157 }
 158
 159 static void s390_ccw_unrealize(S390CCWDevice *cdev)
 160 {
 161     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 162     SubchDev *sch = ccw_dev->sch;
 163
 164     if (sch) {
 165         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 166         g_free(sch);
 167         ccw_dev->sch = NULL;
 168     }
 169
 170     g_free(cdev->mdevid);
 171 }
 172
 173 static void s390_ccw_instance_init(Object *obj)
 174 {
 175     S390CCWDevice *dev = S390_CCW_DEVICE(obj);
 176
 177     device_add_bootindex_property(obj, &dev->bootindex, "bootindex",
 178                                   "/disk@0,0", DEVICE(obj));
 179 }
 180
 181 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 182 {
 183     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 184
 185     cdc->realize = s390_ccw_realize;
 186     cdc->unrealize = s390_ccw_unrealize;
 187 }
 188
 189 static const TypeInfo s390_ccw_info = {
 190     .name          = TYPE_S390_CCW,
 191     .parent        = TYPE_CCW_DEVICE,
 192     .instance_init = s390_ccw_instance_init,
 193     .instance_size = sizeof(S390CCWDevice),
 194     .class_size    = sizeof(S390CCWDeviceClass),
 195     .class_init    = s390_ccw_class_init,
 196     .abstract      = true,
 197 };
 198
 199 static void register_s390_ccw_type(void)
 200 {
 201     type_register_static(&s390_ccw_info);
 202 }
 203
 204 type_init(register_s390_ccw_type)