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 bool 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 false;
  88     }
  89
  90     if (!realpath(sysfsdev, dev_path)) {
  91         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  92         return false;
  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 false;
 102     }
 103
 104     cdev->hostid.cssid = cssid;
 105     cdev->hostid.ssid = ssid;
 106     cdev->hostid.devid = devid;
 107     cdev->hostid.valid = true;
 108     return true;
 109 }
 110
 111 static bool s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
 112 {
 113     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 114     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
 115     DeviceState *parent = DEVICE(ccw_dev);
 116     SubchDev *sch;
 117     int ret;
 118
 119     if (!s390_ccw_get_dev_info(cdev, sysfsdev, errp)) {
 120         return false;
 121     }
 122
 123     sch = css_create_sch(ccw_dev->devno, errp);
 124     if (!sch) {
 125         goto out_mdevid_free;
 126     }
 127     sch->driver_data = cdev;
 128     sch->do_subchannel_work = do_subchannel_work_passthrough;
 129     sch->irb_cb = build_irb_passthrough;
 130
 131     ccw_dev->sch = sch;
 132     ret = css_sch_build_schib(sch, &cdev->hostid);
 133     if (ret) {
 134         error_setg_errno(errp, -ret, "%s: Failed to build initial schib",
 135                          __func__);
 136         goto out_err;
 137     }
 138
 139     if (!ck->realize(ccw_dev, errp)) {
 140         goto out_err;
 141     }
 142
 143     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
 144                           parent->hotplugged, 1);
 145     return true;
 146
 147 out_err:
 148     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 149     ccw_dev->sch = NULL;
 150     g_free(sch);
 151 out_mdevid_free:
 152     g_free(cdev->mdevid);
 153     return false;
 154 }
 155
 156 static void s390_ccw_unrealize(S390CCWDevice *cdev)
 157 {
 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
 170 static 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",
 175                                   "/disk@0,0", DEVICE(obj));
 176 }
 177
 178 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 179 {
 180     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 181
 182     cdc->realize = s390_ccw_realize;
 183     cdc->unrealize = s390_ccw_unrealize;
 184 }
 185
 186 static const TypeInfo s390_ccw_info = {
 187     .name          = TYPE_S390_CCW,
 188     .parent        = TYPE_CCW_DEVICE,
 189     .instance_init = s390_ccw_instance_init,
 190     .instance_size = sizeof(S390CCWDevice),
 191     .class_size    = sizeof(S390CCWDeviceClass),
 192     .class_init    = s390_ccw_class_init,
 193     .abstract      = true,
 194 };
 195
 196 static void register_s390_ccw_type(void)
 197 {
 198     type_register_static(&s390_ccw_info);
 199 }
 200
 201 type_init(register_s390_ccw_type)