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
  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 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
  34                                   char *sysfsdev,
  35                                   Error **errp)
  36 {
  37     unsigned int cssid, ssid, devid;
  38     char dev_path[PATH_MAX] = {0}, *tmp;
  39
  40     if (!sysfsdev) {
  41         error_setg(errp, "No host device provided");
  42         error_append_hint(errp,
  43                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
  44         return;
  45     }
  46
  47     if (!realpath(sysfsdev, dev_path)) {
  48         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  49         return;
  50     }
  51
  52     cdev->mdevid = g_path_get_basename(dev_path);
  53
  54     tmp = basename(dirname(dev_path));
  55     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
  56         error_setg_errno(errp, errno, "Failed to read %s", tmp);
  57         return;
  58     }
  59
  60     cdev->hostid.cssid = cssid;
  61     cdev->hostid.ssid = ssid;
  62     cdev->hostid.devid = devid;
  63     cdev->hostid.valid = true;
  64 }
  65
  66 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
  67 {
  68     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
  69     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
  70     DeviceState *parent = DEVICE(ccw_dev);
  71     SubchDev *sch;
  72     int ret;
  73     Error *err = NULL;
  74
  75     s390_ccw_get_dev_info(cdev, sysfsdev, &err);
  76     if (err) {
  77         goto out_err_propagate;
  78     }
  79
  80     sch = css_create_sch(ccw_dev->devno, &err);
  81     if (!sch) {
  82         goto out_mdevid_free;
  83     }
  84     sch->driver_data = cdev;
  85     sch->do_subchannel_work = do_subchannel_work_passthrough;
  86
  87     ccw_dev->sch = sch;
  88     ret = css_sch_build_schib(sch, &cdev->hostid);
  89     if (ret) {
  90         error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
  91                          __func__);
  92         goto out_err;
  93     }
  94
  95     ck->realize(ccw_dev, &err);
  96     if (err) {
  97         goto out_err;
  98     }
  99
 100     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
 101                           parent->hotplugged, 1);
 102     return;
 103
 104 out_err:
 105     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 106     ccw_dev->sch = NULL;
 107     g_free(sch);
 108 out_mdevid_free:
 109     g_free(cdev->mdevid);
 110 out_err_propagate:
 111     error_propagate(errp, err);
 112 }
 113
 114 static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp)
 115 {
 116     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 117     SubchDev *sch = ccw_dev->sch;
 118
 119     if (sch) {
 120         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 121         g_free(sch);
 122         ccw_dev->sch = NULL;
 123     }
 124
 125     g_free(cdev->mdevid);
 126 }
 127
 128 static void s390_ccw_instance_init(Object *obj)
 129 {
 130     S390CCWDevice *dev = S390_CCW_DEVICE(obj);
 131
 132     device_add_bootindex_property(obj, &dev->bootindex, "bootindex",
 133                                   "/disk@0,0", DEVICE(obj), NULL);
 134 }
 135
 136 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 137 {
 138     DeviceClass *dc = DEVICE_CLASS(klass);
 139     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 140
 141     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 142     cdc->realize = s390_ccw_realize;
 143     cdc->unrealize = s390_ccw_unrealize;
 144 }
 145
 146 static const TypeInfo s390_ccw_info = {
 147     .name          = TYPE_S390_CCW,
 148     .parent        = TYPE_CCW_DEVICE,
 149     .instance_init = s390_ccw_instance_init,
 150     .instance_size = sizeof(S390CCWDevice),
 151     .class_size    = sizeof(S390CCWDeviceClass),
 152     .class_init    = s390_ccw_class_init,
 153     .abstract      = true,
 154 };
 155
 156 static void register_s390_ccw_type(void)
 157 {
 158     type_register_static(&s390_ccw_info);
 159 }
 160
 161 type_init(register_s390_ccw_type)