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 IOInstEnding s390_ccw_store(SubchDev *sch)
  55 {
  56     S390CCWDeviceClass *cdc = NULL;
  57     int ret = IOINST_CC_EXPECTED;
  58
  59     /*
  60      * This code is called for both virtual and passthrough devices,
  61      * but only applies to to the latter.  This ugly check makes that
  62      * distinction for us.
  63      */
  64     if (object_dynamic_cast(OBJECT(sch->driver_data), TYPE_S390_CCW)) {
  65         cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
  66     }
  67
  68     if (cdc && cdc->handle_store) {
  69         ret = cdc->handle_store(sch);
  70     }
  71
  72     return ret;
  73 }
  74
  75 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
  76                                   char *sysfsdev,
  77                                   Error **errp)
  78 {
  79     unsigned int cssid, ssid, devid;
  80     char dev_path[PATH_MAX] = {0}, *tmp;
  81
  82     if (!sysfsdev) {
  83         error_setg(errp, "No host device provided");
  84         error_append_hint(errp,
  85                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
  86         return;
  87     }
  88
  89     if (!realpath(sysfsdev, dev_path)) {
  90         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  91         return;
  92     }
  93
  94     cdev->mdevid = g_path_get_basename(dev_path);
  95
  96     tmp = basename(dirname(dev_path));
  97     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
  98         error_setg_errno(errp, errno, "Failed to read %s", tmp);
  99         return;
 100     }
 101
 102     cdev->hostid.cssid = cssid;
 103     cdev->hostid.ssid = ssid;
 104     cdev->hostid.devid = devid;
 105     cdev->hostid.valid = true;
 106 }
 107
 108 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
 109 {
 110     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 111     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
 112     DeviceState *parent = DEVICE(ccw_dev);
 113     SubchDev *sch;
 114     int ret;
 115     Error *err = NULL;
 116
 117     s390_ccw_get_dev_info(cdev, sysfsdev, &err);
 118     if (err) {
 119         goto out_err_propagate;
 120     }
 121
 122     sch = css_create_sch(ccw_dev->devno, &err);
 123     if (!sch) {
 124         goto out_mdevid_free;
 125     }
 126     sch->driver_data = cdev;
 127     sch->do_subchannel_work = do_subchannel_work_passthrough;
 128
 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
 146 out_err:
 147     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 148     ccw_dev->sch = NULL;
 149     g_free(sch);
 150 out_mdevid_free:
 151     g_free(cdev->mdevid);
 152 out_err_propagate:
 153     error_propagate(errp, err);
 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     DeviceClass *dc = DEVICE_CLASS(klass);
 181     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 182
 183     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 184     cdc->realize = s390_ccw_realize;
 185     cdc->unrealize = s390_ccw_unrealize;
 186 }
 187
 188 static const TypeInfo s390_ccw_info = {
 189     .name          = TYPE_S390_CCW,
 190     .parent        = TYPE_CCW_DEVICE,
 191     .instance_init = s390_ccw_instance_init,
 192     .instance_size = sizeof(S390CCWDevice),
 193     .class_size    = sizeof(S390CCWDeviceClass),
 194     .class_init    = s390_ccw_class_init,
 195     .abstract      = true,
 196 };
 197
 198 static void register_s390_ccw_type(void)
 199 {
 200     type_register_static(&s390_ccw_info);
 201 }
 202
 203 type_init(register_s390_ccw_type)