mirror of https://gitee.com/openkylin/qemu.git
153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*
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* s390 CCW Assignment Support
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*
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* Copyright 2017 IBM Corp
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* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
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* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
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* Pierre Morel <pmorel@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2
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* or (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/sysbus.h"
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#include "libgen.h"
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#include "hw/s390x/css.h"
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#include "hw/s390x/css-bridge.h"
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#include "hw/s390x/s390-ccw.h"
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IOInstEnding s390_ccw_cmd_request(SubchDev *sch)
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{
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S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
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if (!cdc->handle_request) {
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return IOINST_CC_STATUS_PRESENT;
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}
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return cdc->handle_request(sch);
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}
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static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
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char *sysfsdev,
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Error **errp)
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{
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unsigned int cssid, ssid, devid;
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char dev_path[PATH_MAX] = {0}, *tmp;
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if (!sysfsdev) {
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error_setg(errp, "No host device provided");
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error_append_hint(errp,
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"Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
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return;
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}
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if (!realpath(sysfsdev, dev_path)) {
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error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
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return;
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}
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cdev->mdevid = g_strdup(basename(dev_path));
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tmp = basename(dirname(dev_path));
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if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
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error_setg_errno(errp, errno, "Failed to read %s", tmp);
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return;
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}
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cdev->hostid.cssid = cssid;
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cdev->hostid.ssid = ssid;
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cdev->hostid.devid = devid;
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cdev->hostid.valid = true;
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}
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static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
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{
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CcwDevice *ccw_dev = CCW_DEVICE(cdev);
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CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
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DeviceState *parent = DEVICE(ccw_dev);
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BusState *qbus = qdev_get_parent_bus(parent);
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VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus);
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SubchDev *sch;
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int ret;
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Error *err = NULL;
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s390_ccw_get_dev_info(cdev, sysfsdev, &err);
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if (err) {
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goto out_err_propagate;
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}
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sch = css_create_sch(ccw_dev->devno, cbus->squash_mcss, &err);
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if (!sch) {
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goto out_mdevid_free;
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}
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sch->driver_data = cdev;
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sch->do_subchannel_work = do_subchannel_work_passthrough;
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ccw_dev->sch = sch;
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ret = css_sch_build_schib(sch, &cdev->hostid);
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if (ret) {
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error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
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__func__);
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goto out_err;
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}
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ck->realize(ccw_dev, &err);
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if (err) {
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goto out_err;
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}
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css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
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parent->hotplugged, 1);
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return;
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out_err:
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css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
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ccw_dev->sch = NULL;
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g_free(sch);
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out_mdevid_free:
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g_free(cdev->mdevid);
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out_err_propagate:
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error_propagate(errp, err);
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}
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static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp)
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{
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CcwDevice *ccw_dev = CCW_DEVICE(cdev);
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SubchDev *sch = ccw_dev->sch;
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if (sch) {
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css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
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g_free(sch);
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ccw_dev->sch = NULL;
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}
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g_free(cdev->mdevid);
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}
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static void s390_ccw_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
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dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
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cdc->realize = s390_ccw_realize;
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cdc->unrealize = s390_ccw_unrealize;
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}
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static const TypeInfo s390_ccw_info = {
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.name = TYPE_S390_CCW,
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.parent = TYPE_CCW_DEVICE,
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.instance_size = sizeof(S390CCWDevice),
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.class_size = sizeof(S390CCWDeviceClass),
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.class_init = s390_ccw_class_init,
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.abstract = true,
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};
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static void register_s390_ccw_type(void)
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{
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type_register_static(&s390_ccw_info);
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}
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type_init(register_s390_ccw_type)
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