qemu

s390-ccw.c (5230B)

---

 /*
  * s390 CCW Assignment Support
  *
  * Copyright 2017 IBM Corp
  * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
  *            Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
  *            Pierre Morel <pmorel@linux.vnet.ibm.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2
  * or (at your option) any later version. See the COPYING file in the
  * top-level directory.
  */
 
 #include "qemu/osdep.h"
 #include <libgen.h>
 #include "qapi/error.h"
 #include "qemu/module.h"
 #include "hw/s390x/css.h"
 #include "hw/s390x/css-bridge.h"
 #include "hw/s390x/s390-ccw.h"
 #include "sysemu/sysemu.h"
 
 IOInstEnding s390_ccw_cmd_request(SubchDev *sch)
 {
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
 
     if (!cdc->handle_request) {
         return IOINST_CC_STATUS_PRESENT;
     }
     return cdc->handle_request(sch);
 }
 
 int s390_ccw_halt(SubchDev *sch)
 {
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
 
     if (!cdc->handle_halt) {
         return -ENOSYS;
     }
     return cdc->handle_halt(sch);
 }
 
 int s390_ccw_clear(SubchDev *sch)
 {
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
 
     if (!cdc->handle_clear) {
         return -ENOSYS;
     }
     return cdc->handle_clear(sch);
 }
 
 IOInstEnding s390_ccw_store(SubchDev *sch)
 {
     S390CCWDeviceClass *cdc = NULL;
     int ret = IOINST_CC_EXPECTED;
 
     /*
      * This code is called for both virtual and passthrough devices,
      * but only applies to the latter.  This ugly check makes that
      * distinction for us.
      */
     if (object_dynamic_cast(OBJECT(sch->driver_data), TYPE_S390_CCW)) {
         cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
     }
 
     if (cdc && cdc->handle_store) {
         ret = cdc->handle_store(sch);
     }
 
     return ret;
 }
 
 static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
                                   char *sysfsdev,
                                   Error **errp)
 {
     unsigned int cssid, ssid, devid;
     char dev_path[PATH_MAX] = {0}, *tmp;
 
     if (!sysfsdev) {
         error_setg(errp, "No host device provided");
         error_append_hint(errp,
                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
         return;
     }
 
     if (!realpath(sysfsdev, dev_path)) {
         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
         return;
     }
 
     cdev->mdevid = g_path_get_basename(dev_path);
 
     tmp = basename(dirname(dev_path));
     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
         error_setg_errno(errp, errno, "Failed to read %s", tmp);
         return;
     }
 
     cdev->hostid.cssid = cssid;
     cdev->hostid.ssid = ssid;
     cdev->hostid.devid = devid;
     cdev->hostid.valid = true;
 }
 
 static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
 {
     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
     DeviceState *parent = DEVICE(ccw_dev);
     SubchDev *sch;
     int ret;
     Error *err = NULL;
 
     s390_ccw_get_dev_info(cdev, sysfsdev, &err);
     if (err) {
         goto out_err_propagate;
     }
 
     sch = css_create_sch(ccw_dev->devno, &err);
     if (!sch) {
         goto out_mdevid_free;
     }
     sch->driver_data = cdev;
     sch->do_subchannel_work = do_subchannel_work_passthrough;
     sch->irb_cb = build_irb_passthrough;
 
     ccw_dev->sch = sch;
     ret = css_sch_build_schib(sch, &cdev->hostid);
     if (ret) {
         error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
                          __func__);
         goto out_err;
     }
 
     ck->realize(ccw_dev, &err);
     if (err) {
         goto out_err;
     }
 
     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
                           parent->hotplugged, 1);
     return;
 
 out_err:
     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
     ccw_dev->sch = NULL;
     g_free(sch);
 out_mdevid_free:
     g_free(cdev->mdevid);
 out_err_propagate:
     error_propagate(errp, err);
 }
 
 static void s390_ccw_unrealize(S390CCWDevice *cdev)
 {
     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
     SubchDev *sch = ccw_dev->sch;
 
     if (sch) {
         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
         g_free(sch);
         ccw_dev->sch = NULL;
     }
 
     g_free(cdev->mdevid);
 }
 
 static void s390_ccw_instance_init(Object *obj)
 {
     S390CCWDevice *dev = S390_CCW_DEVICE(obj);
 
     device_add_bootindex_property(obj, &dev->bootindex, "bootindex",
                                   "/disk@0,0", DEVICE(obj));
 }
 
 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 {
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 
     cdc->realize = s390_ccw_realize;
     cdc->unrealize = s390_ccw_unrealize;
 }
 
 static const TypeInfo s390_ccw_info = {
     .name          = TYPE_S390_CCW,
     .parent        = TYPE_CCW_DEVICE,
     .instance_init = s390_ccw_instance_init,
     .instance_size = sizeof(S390CCWDevice),
     .class_size    = sizeof(S390CCWDeviceClass),
     .class_init    = s390_ccw_class_init,
     .abstract      = true,
 };
 
 static void register_s390_ccw_type(void)
 {
     type_register_static(&s390_ccw_info);
 }
 
 type_init(register_s390_ccw_type)