LXR qemu/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
  23IOInstEnding 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
  33int 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
  43int 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
  53IOInstEnding 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 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
  74static void 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}, *tmp;
  80
  81    if (!sysfsdev) {
  82        error_setg(errp, "No host device provided");
  83        error_append_hint(errp,
  84                          "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
  85        return;
  86    }
  87
  88    if (!realpath(sysfsdev, dev_path)) {
  89        error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
  90        return;
  91    }
  92
  93    cdev->mdevid = g_path_get_basename(dev_path);
  94
  95    tmp = basename(dirname(dev_path));
  96    if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
  97        error_setg_errno(errp, errno, "Failed to read %s", tmp);
  98        return;
  99    }
 100
 101    cdev->hostid.cssid = cssid;
 102    cdev->hostid.ssid = ssid;
 103    cdev->hostid.devid = devid;
 104    cdev->hostid.valid = true;
 105}
 106
 107static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
 108{
 109    CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 110    CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
 111    DeviceState *parent = DEVICE(ccw_dev);
 112    SubchDev *sch;
 113    int ret;
 114    Error *err = NULL;
 115
 116    s390_ccw_get_dev_info(cdev, sysfsdev, &err);
 117    if (err) {
 118        goto out_err_propagate;
 119    }
 120
 121    sch = css_create_sch(ccw_dev->devno, &err);
 122    if (!sch) {
 123        goto out_mdevid_free;
 124    }
 125    sch->driver_data = cdev;
 126    sch->do_subchannel_work = do_subchannel_work_passthrough;
 127    sch->irb_cb = build_irb_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
 146out_err:
 147    css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 148    ccw_dev->sch = NULL;
 149    g_free(sch);
 150out_mdevid_free:
 151    g_free(cdev->mdevid);
 152out_err_propagate:
 153    error_propagate(errp, err);
 154}
 155
 156static 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
 170static 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
 178static 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
 186static 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
 196static void register_s390_ccw_type(void)
 197{
 198    type_register_static(&s390_ccw_info);
 199}
 200
 201type_init(register_s390_ccw_type)
 202