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 #include "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "hw/sysbus.h"
  16 #include "libgen.h"
  17 #include "hw/s390x/css.h"
  18 #include "hw/s390x/css-bridge.h"
  19 #include "hw/s390x/s390-ccw.h"
  20
  21 IOInstEnding s390_ccw_cmd_request(SubchDev *sch)
  22 {
  23     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
  24
  25     if (!cdc->handle_request) {
  26         return IOINST_CC_STATUS_PRESENT;
  27     }
  28     return cdc->handle_request(sch);
  29 }
  30
  31 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
  32                                   char *sysfsdev,
  33                                   Error **errp)
  34 {
  35     unsigned int cssid, ssid, devid;
  36     char dev_path[PATH_MAX] = {0}, *tmp;
  37
  38     if (!sysfsdev) {
  39         error_setg(errp, "No host device provided");
  40         error_append_hint(errp,
  41                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
  42         return;
  43     }
  44
  45     if (!realpath(sysfsdev, dev_path)) {
  46         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  47         return;
  48     }
  49
  50     cdev->mdevid = g_strdup(basename(dev_path));
  51
  52     tmp = basename(dirname(dev_path));
  53     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
  54         error_setg_errno(errp, errno, "Failed to read %s", tmp);
  55         return;
  56     }
  57
  58     cdev->hostid.cssid = cssid;
  59     cdev->hostid.ssid = ssid;
  60     cdev->hostid.devid = devid;
  61     cdev->hostid.valid = true;
  62 }
  63
  64 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
  65 {
  66     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
  67     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
  68     DeviceState *parent = DEVICE(ccw_dev);
  69     BusState *qbus = qdev_get_parent_bus(parent);
  70     VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus);
  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, false, cbus->squash_mcss, &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_class_init(ObjectClass *klass, void *data)
 129 {
 130     DeviceClass *dc = DEVICE_CLASS(klass);
 131     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 132
 133     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 134     cdc->realize = s390_ccw_realize;
 135     cdc->unrealize = s390_ccw_unrealize;
 136 }
 137
 138 static const TypeInfo s390_ccw_info = {
 139     .name          = TYPE_S390_CCW,
 140     .parent        = TYPE_CCW_DEVICE,
 141     .instance_size = sizeof(S390CCWDevice),
 142     .class_size    = sizeof(S390CCWDeviceClass),
 143     .class_init    = s390_ccw_class_init,
 144     .abstract      = true,
 145 };
 146
 147 static void register_s390_ccw_type(void)
 148 {
 149     type_register_static(&s390_ccw_info);
 150 }
 151
 152 type_init(register_s390_ccw_type)