hw/s390x/s390-ccw.c

   1 /*
   2  * s390 CCW Assignment Support
   3  *
   4  * Copyright 2017 IBM Corp
   5  * Author(s): Dong Jia Shi <[email protected]>
   6  *            Xiao Feng Ren <[email protected]>
   7  *            Pierre Morel <[email protected]>
   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 "hw/sysbus.h"
  18 #include "hw/s390x/css.h"
  19 #include "hw/s390x/css-bridge.h"
  20 #include "hw/s390x/s390-ccw.h"
  21
  22 IOInstEnding s390_ccw_cmd_request(SubchDev *sch)
  23 {
  24     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
  25
  26     if (!cdc->handle_request) {
  27         return IOINST_CC_STATUS_PRESENT;
  28     }
  29     return cdc->handle_request(sch);
  30 }
  31
  32 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
  33                                   char *sysfsdev,
  34                                   Error **errp)
  35 {
  36     unsigned int cssid, ssid, devid;
  37     char dev_path[PATH_MAX] = {0}, *tmp;
  38
  39     if (!sysfsdev) {
  40         error_setg(errp, "No host device provided");
  41         error_append_hint(errp,
  42                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
  43         return;
  44     }
  45
  46     if (!realpath(sysfsdev, dev_path)) {
  47         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  48         return;
  49     }
  50
  51     cdev->mdevid = g_strdup(basename(dev_path));
  52
  53     tmp = basename(dirname(dev_path));
  54     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
  55         error_setg_errno(errp, errno, "Failed to read %s", tmp);
  56         return;
  57     }
  58
  59     cdev->hostid.cssid = cssid;
  60     cdev->hostid.ssid = ssid;
  61     cdev->hostid.devid = devid;
  62     cdev->hostid.valid = true;
  63 }
  64
  65 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
  66 {
  67     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
  68     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
  69     DeviceState *parent = DEVICE(ccw_dev);
  70     BusState *qbus = qdev_get_parent_bus(parent);
  71     VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus);
  72     SubchDev *sch;
  73     int ret;
  74     Error *err = NULL;
  75
  76     s390_ccw_get_dev_info(cdev, sysfsdev, &err);
  77     if (err) {
  78         goto out_err_propagate;
  79     }
  80
  81     sch = css_create_sch(ccw_dev->devno, cbus->squash_mcss, &err);
  82     if (!sch) {
  83         goto out_mdevid_free;
  84     }
  85     sch->driver_data = cdev;
  86     sch->do_subchannel_work = do_subchannel_work_passthrough;
  87
  88     ccw_dev->sch = sch;
  89     ret = css_sch_build_schib(sch, &cdev->hostid);
  90     if (ret) {
  91         error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
  92                          __func__);
  93         goto out_err;
  94     }
  95
  96     ck->realize(ccw_dev, &err);
  97     if (err) {
  98         goto out_err;
  99     }
 100
 101     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
 102                           parent->hotplugged, 1);
 103     return;
 104
 105 out_err:
 106     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 107     ccw_dev->sch = NULL;
 108     g_free(sch);
 109 out_mdevid_free:
 110     g_free(cdev->mdevid);
 111 out_err_propagate:
 112     error_propagate(errp, err);
 113 }
 114
 115 static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp)
 116 {
 117     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 118     SubchDev *sch = ccw_dev->sch;
 119
 120     if (sch) {
 121         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 122         g_free(sch);
 123         ccw_dev->sch = NULL;
 124     }
 125
 126     g_free(cdev->mdevid);
 127 }
 128
 129 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 130 {
 131     DeviceClass *dc = DEVICE_CLASS(klass);
 132     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 133
 134     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 135     cdc->realize = s390_ccw_realize;
 136     cdc->unrealize = s390_ccw_unrealize;
 137 }
 138
 139 static const TypeInfo s390_ccw_info = {
 140     .name          = TYPE_S390_CCW,
 141     .parent        = TYPE_CCW_DEVICE,
 142     .instance_size = sizeof(S390CCWDevice),
 143     .class_size    = sizeof(S390CCWDeviceClass),
 144     .class_init    = s390_ccw_class_init,
 145     .abstract      = true,
 146 };
 147
 148 static void register_s390_ccw_type(void)
 149 {
 150     type_register_static(&s390_ccw_info);
 151 }
 152
 153 type_init(register_s390_ccw_type)